2730.ppt
•Download as PPT, PDF•
0 likes•1 view
Synchronous motors and generators operate by synchronizing the rotation of the rotor's magnetic field with the rotating magnetic field produced by the stator windings. Synchronous motors are used for constant-speed applications like propulsion for large ships. They work by locking the rotor's magnetic field to the rotating stator field. Synchronous generators can be produced by transitioning a synchronous motor driven by a turbine from motor to generator operation as the power angle shifts from negative to positive.
Report
Share
Report
Share
Recommended
EMA410S_Synchronous Motors Part 2.pptx
This document provides information about synchronous motors. It discusses the characteristics of synchronous motors including their stator, rotor types, and ability to start as an induction motor. It also covers synchronous speed calculation, equivalent circuits and phasor diagrams, V-curves, applications, starting methods, torque types, losses, and comparisons with induction motors. Worked examples are provided to calculate induced EMF, current, power factor and torque values for synchronous motors operating under different load and excitation conditions.
Dc motor
DC motors convert electrical energy into mechanical energy. There are two main types - AC and DC. A DC motor has a stationary magnetic field and an armature that rotates. The interaction between the magnetic field and current in the armature causes it to rotate. DC motors are classified as shunt, series, or compound based on how the field and armature circuits are connected. Shunt motors are constant speed, series motors have high starting torque but variable speed, and compound motors have characteristics of both.
Synchronous machine
Synchronous machine construction, working principle explanation, types and operation, Characteristics, Phasor angle, application, advantages, and Disadvantages
Synchronous Motors.pptx
This document summarizes the operation of a synchronous motor. It discusses:
1) The synchronous motor operates at a constant speed determined by pole count and frequency. It can improve power factor by varying field excitation from lagging to leading.
2) Starting methods include using a DC motor or damper windings to start as an induction motor before synchronizing.
3) Torque curves show maximum torque occurs at a load angle of 90 degrees. Power input varies with excitation and voltage. The current locus is circular for constant excitation or power.
4) Synchronous condensers improve power factor by supplying leading current when over-excited while not loaded.
Synchronous Motors.pptx
Principle of operation – Equivalent circuit and phasor diagram – Starting methods – V and inverted V Curves – Power transforming and capability curves – Effect of varying excitation – Hunting – Synchronous condenser – Speed control of synchronous motor.
ENERGY_CONVERSION_12.ppt
The document discusses the operation of synchronous motors connected to large power systems. Some key points:
1) Synchronous motors operate similarly to synchronous generators but consume power instead of supplying it.
2) When connected to a large power system represented as an "infinite bus", the motor's speed is locked to the system frequency and its voltage matches the system voltage.
3) Under steady state operation, the motor supplies constant speed power to loads while drawing constant real power from the system. An increase in load causes the motor's torque angle to increase to produce more torque.
dcmotor-190211092619.pptx
DC motors convert electrical energy into mechanical energy. There are two main types - AC and DC. DC motors have an armature winding that interacts with an external magnetic field to produce rotational motion (torque). The direction of rotation is determined by Fleming's left-hand rule. DC motors are classified as shunt, series, or compound based on their field windings. Shunt motors are constant speed motors while series motors produce high starting torque but have uncontrolled speed. Compound motors combine characteristics of shunt and series motors.
synchronous generators
1) A synchronous generator produces AC voltage through induction in its stator windings caused by a rotating magnetic field generated by its rotor. The rotor contains field windings energized by DC current to produce the magnetic field.
2) The internal generated voltage of the generator depends on its rotational speed and magnetic flux. However, armature reaction and impedance effects cause the terminal voltage to differ from the internal voltage under load conditions.
3) Equivalent circuits are used to model synchronous generators, representing the internal generated voltage and impedance effects. Phasor diagrams illustrate the relationship between voltages and currents under different load power factors.
Recommended
EMA410S_Synchronous Motors Part 2.pptx
This document provides information about synchronous motors. It discusses the characteristics of synchronous motors including their stator, rotor types, and ability to start as an induction motor. It also covers synchronous speed calculation, equivalent circuits and phasor diagrams, V-curves, applications, starting methods, torque types, losses, and comparisons with induction motors. Worked examples are provided to calculate induced EMF, current, power factor and torque values for synchronous motors operating under different load and excitation conditions.
Dc motor
DC motors convert electrical energy into mechanical energy. There are two main types - AC and DC. A DC motor has a stationary magnetic field and an armature that rotates. The interaction between the magnetic field and current in the armature causes it to rotate. DC motors are classified as shunt, series, or compound based on how the field and armature circuits are connected. Shunt motors are constant speed, series motors have high starting torque but variable speed, and compound motors have characteristics of both.
Synchronous machine
Synchronous machine construction, working principle explanation, types and operation, Characteristics, Phasor angle, application, advantages, and Disadvantages
Synchronous Motors.pptx
This document summarizes the operation of a synchronous motor. It discusses:
1) The synchronous motor operates at a constant speed determined by pole count and frequency. It can improve power factor by varying field excitation from lagging to leading.
2) Starting methods include using a DC motor or damper windings to start as an induction motor before synchronizing.
3) Torque curves show maximum torque occurs at a load angle of 90 degrees. Power input varies with excitation and voltage. The current locus is circular for constant excitation or power.
4) Synchronous condensers improve power factor by supplying leading current when over-excited while not loaded.
Synchronous Motors.pptx
Principle of operation – Equivalent circuit and phasor diagram – Starting methods – V and inverted V Curves – Power transforming and capability curves – Effect of varying excitation – Hunting – Synchronous condenser – Speed control of synchronous motor.
ENERGY_CONVERSION_12.ppt
The document discusses the operation of synchronous motors connected to large power systems. Some key points:
1) Synchronous motors operate similarly to synchronous generators but consume power instead of supplying it.
2) When connected to a large power system represented as an "infinite bus", the motor's speed is locked to the system frequency and its voltage matches the system voltage.
3) Under steady state operation, the motor supplies constant speed power to loads while drawing constant real power from the system. An increase in load causes the motor's torque angle to increase to produce more torque.
dcmotor-190211092619.pptx
DC motors convert electrical energy into mechanical energy. There are two main types - AC and DC. DC motors have an armature winding that interacts with an external magnetic field to produce rotational motion (torque). The direction of rotation is determined by Fleming's left-hand rule. DC motors are classified as shunt, series, or compound based on their field windings. Shunt motors are constant speed motors while series motors produce high starting torque but have uncontrolled speed. Compound motors combine characteristics of shunt and series motors.
synchronous generators
1) A synchronous generator produces AC voltage through induction in its stator windings caused by a rotating magnetic field generated by its rotor. The rotor contains field windings energized by DC current to produce the magnetic field.
2) The internal generated voltage of the generator depends on its rotational speed and magnetic flux. However, armature reaction and impedance effects cause the terminal voltage to differ from the internal voltage under load conditions.
3) Equivalent circuits are used to model synchronous generators, representing the internal generated voltage and impedance effects. Phasor diagrams illustrate the relationship between voltages and currents under different load power factors.
synchronous motor, Starting Torque, Types, Equivalent Circuit, Torque-speed c...
Synchronous motors operate at a constant synchronous speed determined by the supply frequency. They require an external DC excitation source to start and synchronize the rotor speed with the rotating stator magnetic field. Synchronous motors can develop torque through a wide range of speeds and loads, and are well-suited for applications requiring constant speed operation or power factor correction.
Synchronous generators
The document discusses the construction and operation of synchronous generators. It describes how a synchronous generator works by applying a DC current to the rotor to create a rotating magnetic field, which induces a 3-phase voltage in the stator windings. It also discusses the rotor, field windings, armature windings, brushless excitation systems, equivalent circuits, phasor diagrams, and the effects of load changes on generators operating alone or connected in parallel.
Eee ppt
An electric motor converts electrical energy to mechanical energy through electromagnetic induction. It has a stationary stator and a rotating rotor. Induction motors are the most common type, having a squirrel cage rotor. When a three-phase current is applied to the stator, it creates a rotating magnetic field that induces currents in the rotor and causes it to turn, but at a slightly slower synchronous speed due to slip. The torque and power output can be varied by changing the supply frequency or voltage.
10319264.ppt
This document provides information about different types of electric motors, including:
- AC induction motors, which are the most common type used in industry. They have a simple design and are inexpensive to maintain.
- AC synchronous motors, which run at a constant speed determined by the frequency of the power supply. They are used where power factor improvement is needed.
- Single phase AC motors like shaded-pole, split-phase, and capacitor-start motors, which are used in household appliances. These motors require additional components to generate a rotating magnetic field for starting.
- DC motors that have different winding configurations determining their speed and torque characteristics, like series-wound, shunt-wound,
DC MACHINE-Motoring and generation, Armature circuit equation
Motoring and generation
Armature circuit equation for motoring and generation,
Types of field excitations - separately excited, shunt and series.
Open circuit characteristic of separately excited DC generator,
back EMF with armature reaction,
voltage build-up in a shunt generator,
critical field resistance and critical speed.
V-I characteristics and torque-speed characteristics of separately excited shunt and series motors.
Speed control through armature voltage.
Losses, load testing and back-to-back testing of DC machines
Unit - V DC Motor.pptx
The document provides information about DC motors, including:
1. It describes the principle and operation of DC motors, including the roles of back EMF and Fleming's left hand rule.
2. It discusses the different types of DC motors like separately excited, series, shunt, and compound motors.
3. Speed and torque equations are presented, and characteristics like speed-current, torque-current, and speed-torque are explained for different motor types.
4. Methods of speed control for DC shunt motors like resistance, flux, and voltage control are summarized.
5. Starters for DC motors and their necessity are outlined briefly.
6. Permanent magnet DC motors are
Synchronous generator
Synchronous generator is a machine which converts mechanical power into electrical power. Three phase synchronous machine are used in thermal , hydro power plant to generate the electrical. Synchronous generator is used to generate the large number of electricity
ppts D.c motors.pptx
A DC motor converts electrical energy into mechanical energy through electromagnetic induction. When a current-carrying conductor is placed in a magnetic field, it experiences a mechanical force. In a DC motor, this force causes the armature conductors to rotate, producing torque. The motor's magnetic field is produced by a field winding and direct current is supplied by an external DC power source. A three-point starter is used to gradually reduce armature current and limit sparking during startup as motor speed increases and back EMF rises.
Dc machines1
1. The document discusses DC generators and DC motors, including their operating principles, different types (shunt, series, compound), and methods of speed and torque control.
2. Some key topics covered include separately excited DC generators, armature reaction, back EMF in motors, starting and braking methods for DC motors, and the differences between shunt, series, and compound motor characteristics.
3. The document provides information on DC machines that would be useful for understanding their design and applications.
Lecture 4-ELECTRIC MOTORS-ACTUATION SYSTEMS2.ppt
This document discusses robot actuation and feedback components, including electric motors and servo motors. It provides details on different types of DC motors like series wound, shunt wound, compound wound, and separately excited motors. It also covers stepper motors, explaining their specifications and full step and half step commutation sequences. Servo motors are defined as motors that can rotate with precision using a closed-loop feedback system to control the shaft position. Applications of different motor types are also listed.
CAPACITOR START INDUCTION MOTOR
The document summarizes different types of single-phase induction motors. It describes how squirrel cage induction motors work using a stator winding to induce currents in the rotor and how they operate at slightly lower than synchronous speed. It also explains two types of split-phase motors: resistance-start induction-run motors which use winding resistance to generate a starting torque, and capacitor-start induction-run motors which use a capacitor in series with the starting winding to produce a 90 degree phase difference between windings for starting torque.
single phaser IM.pptx
1. The document discusses different types of single-phase induction motors, including split-phase, capacitor start, permanent split capacitor, and shaded pole motors.
2. It explains the operating principles of each type, such as how they generate a rotating magnetic field to produce starting torque using auxiliary windings and capacitors.
3. The key applications of each motor type are mentioned, such as fans and blowers for permanent split capacitor motors and compressors for capacitor start capacitor run motors.
single phase Induction Motor-types, construction working.pptx
This document discusses different types of electric motors including AC and DC motors. It provides details on AC induction motors, the most common type used in industry. Key points include:
- AC induction motors have a stationary stator and a rotating rotor. They are self-starting, require no brushes, and are inexpensive and reliable.
- The rotor is either a squirrel cage or wound type. Squirrel cage motors are fixed speed while wound rotor motors can vary speed.
- Motors are started by using a capacitor, which is then disconnected for running (capacitor-start) or kept connected to improve power factor (capacitor-run).
- Three-phase induction motors are very common for
Synchronous generator construction
1) Synchronous generators have rotor windings that produce a rotating magnetic field and stator windings where 3-phase voltage is induced. They are driven by diesel engines, water turbines, or steam turbines.
2) The rotor magnetic poles can be either salient (sticking out) or cylindrical construction and are made of laminated steel to reduce eddy currents. Stator windings are used because connections are easier than on the rotating rotor.
3) Excitation systems use slip rings and brushes or brushless exciters to supply DC current to the rotor windings. This produced the rotating magnetic field needed to induce voltage in the stator windings.
Single phase induction motor
The single-phase motor, which are designed to operate from a single-phase supply, are manufactured in a large number of types to perform a wide variety of useful services in home, offices, factories, workshops and in a business establishments etc.
Small motors, particularly in the frictional kW sizes are better known than any other. In fact, most of the new products of the manufacturers of space vehicles, aircrafts, business machines and power tools etc. have been possible due to of the advances made in the design of frictional kW motors. Since the performance requirements of the various applications differ so widely, the motor manufacturing industry has developed many different types of such motors, each being designed to meet specific demands.
Single-phase motors may be classified as under, depending on their construction and method of starting:
1. Induction Motors (split-phase, capacitor and shaded-pole etc.)
2. Repulsion Motors (sometime called inductive-series motor)
3. AC Series Motor, and
4. Un-excited Synchronous Motors
Synchronous motor
A synchronous motor is electrically identical with an alternator or AC generator.
A given alternator ( or synchronous machine) can be used as a motor, when driven electrically.
Some characteristic features of a synchronous motor are as follows:
1. It runs either at synchronous speed or not at all i.e. while running it maintains a constant speed. The only way to change its speed is to vary the supply frequency (because NS=120f/P).
2. It is not inherently self-starting. It has to be run up to synchronous (or near synchronous) speed by some means, before it can be synchronized to the supply.
3. It is capable of being operated under a wide range of power factors, both lagging and leading. Hence, it can be used for power correction purposes, in addition to supplying torque to drive loads.
Dc machines ppt
A DC generator converts mechanical energy into electrical energy using electromagnetic induction. It consists of a magnetic frame, field poles, an armature, and a commutator. The armature rotates under the poles, cutting the magnetic flux and inducing an EMF. The commutator converts the alternating EMF into a pulsating DC voltage. DC generators are classified as separately excited, self-excited (series, shunt, compound), depending on how the field is connected. A DC motor operates on the principle that a current-carrying conductor in a magnetic field experiences a torque. It consists of an armature, field poles, a commutator, and brushes. The back EMF opposes the applied voltage
Module4.pptx
This document provides information on DC generators and DC motors. It discusses the components and workings of DC generators such as the armature, field coils, and commutator. It also covers DC motor types such as separately excited, shunt wound, series wound, and compound wound motors. The document discusses DC motor characteristics such as torque-current, speed-current, and speed-torque curves. It provides equations for back EMF, torque, and power in DC machines. Key aspects of DC generators and motors like electromagnetic induction, armature winding types, and motor speed control via back EMF are also summarized.
Synchronous machines
This document provides an overview of synchronous machines and synchronous condensers. It discusses key topics such as:
- The basic components and operating principles of synchronous machines and how they can function as motors or generators.
- Concepts like torque, power, energy and their relationships in synchronous machines.
- How synchronous machines synchronize to the frequency of the power system and their operating speed relationship.
- Power flow, internal and terminal voltages, and torque angle in synchronous machines.
- Losses that occur in synchronous machines and how efficiency is affected.
- The use of synchronous condensers to provide reactive power support through field excitation control while transferring little to no real power.
- Models for analyzing
DC Machines with explanation in detail of everything
A DC motor chapter is summarized in 3 sentences:
DC machines can operate as motors or generators and include DC motors which use a DC power source and have a stationary field coil and rotating armature. The speed of a DC motor is proportional to its back EMF and inversely proportional to the armature current. Examples show how to calculate the speed of DC motors under different load conditions by determining the back EMF using the motor's equivalent circuit.
Fall11_4_13GezaJoos_IntegrationAndInterconnectionOfDistributedEnergyResources...
This document discusses issues related to integrating distributed energy resources (DER) into electric power grids. It provides background on DER definitions and classifications. It addresses grid integration and interconnection standards, including requirements for steady state and transient operations, protection, and islanding detection. The document outlines considerations for DER protection and control requirements to safely interconnect DER while maintaining grid reliability. It also presents examples of DER installations and research on advanced relay techniques for islanding detection.
tanveerppt-170427091913.pdf
This document discusses unintentional islanding of power systems with distributed resources like solar PV. It defines intentional and unintentional islands, and issues with unintentional islands like safety hazards, overvoltages, and loss of protection. Methods to detect unintentional islands are described, like reverse power relays and active techniques. Simulation results show one technique detecting an island within 0.5 cycles. Guidelines for assessing islanding risk are provided, and the future of anti-islanding techniques discussed, like the potential need for multiple active methods with reduced grid stiffness.
More Related Content
Similar to 2730.ppt
synchronous motor, Starting Torque, Types, Equivalent Circuit, Torque-speed c...
Synchronous motors operate at a constant synchronous speed determined by the supply frequency. They require an external DC excitation source to start and synchronize the rotor speed with the rotating stator magnetic field. Synchronous motors can develop torque through a wide range of speeds and loads, and are well-suited for applications requiring constant speed operation or power factor correction.
Synchronous generators
The document discusses the construction and operation of synchronous generators. It describes how a synchronous generator works by applying a DC current to the rotor to create a rotating magnetic field, which induces a 3-phase voltage in the stator windings. It also discusses the rotor, field windings, armature windings, brushless excitation systems, equivalent circuits, phasor diagrams, and the effects of load changes on generators operating alone or connected in parallel.
Eee ppt
An electric motor converts electrical energy to mechanical energy through electromagnetic induction. It has a stationary stator and a rotating rotor. Induction motors are the most common type, having a squirrel cage rotor. When a three-phase current is applied to the stator, it creates a rotating magnetic field that induces currents in the rotor and causes it to turn, but at a slightly slower synchronous speed due to slip. The torque and power output can be varied by changing the supply frequency or voltage.
10319264.ppt
This document provides information about different types of electric motors, including:
- AC induction motors, which are the most common type used in industry. They have a simple design and are inexpensive to maintain.
- AC synchronous motors, which run at a constant speed determined by the frequency of the power supply. They are used where power factor improvement is needed.
- Single phase AC motors like shaded-pole, split-phase, and capacitor-start motors, which are used in household appliances. These motors require additional components to generate a rotating magnetic field for starting.
- DC motors that have different winding configurations determining their speed and torque characteristics, like series-wound, shunt-wound,
DC MACHINE-Motoring and generation, Armature circuit equation
Motoring and generation
Armature circuit equation for motoring and generation,
Types of field excitations - separately excited, shunt and series.
Open circuit characteristic of separately excited DC generator,
back EMF with armature reaction,
voltage build-up in a shunt generator,
critical field resistance and critical speed.
V-I characteristics and torque-speed characteristics of separately excited shunt and series motors.
Speed control through armature voltage.
Losses, load testing and back-to-back testing of DC machines
Unit - V DC Motor.pptx
The document provides information about DC motors, including:
1. It describes the principle and operation of DC motors, including the roles of back EMF and Fleming's left hand rule.
2. It discusses the different types of DC motors like separately excited, series, shunt, and compound motors.
3. Speed and torque equations are presented, and characteristics like speed-current, torque-current, and speed-torque are explained for different motor types.
4. Methods of speed control for DC shunt motors like resistance, flux, and voltage control are summarized.
5. Starters for DC motors and their necessity are outlined briefly.
6. Permanent magnet DC motors are
Synchronous generator
Synchronous generator is a machine which converts mechanical power into electrical power. Three phase synchronous machine are used in thermal , hydro power plant to generate the electrical. Synchronous generator is used to generate the large number of electricity
ppts D.c motors.pptx
A DC motor converts electrical energy into mechanical energy through electromagnetic induction. When a current-carrying conductor is placed in a magnetic field, it experiences a mechanical force. In a DC motor, this force causes the armature conductors to rotate, producing torque. The motor's magnetic field is produced by a field winding and direct current is supplied by an external DC power source. A three-point starter is used to gradually reduce armature current and limit sparking during startup as motor speed increases and back EMF rises.
Dc machines1
1. The document discusses DC generators and DC motors, including their operating principles, different types (shunt, series, compound), and methods of speed and torque control.
2. Some key topics covered include separately excited DC generators, armature reaction, back EMF in motors, starting and braking methods for DC motors, and the differences between shunt, series, and compound motor characteristics.
3. The document provides information on DC machines that would be useful for understanding their design and applications.
Lecture 4-ELECTRIC MOTORS-ACTUATION SYSTEMS2.ppt
This document discusses robot actuation and feedback components, including electric motors and servo motors. It provides details on different types of DC motors like series wound, shunt wound, compound wound, and separately excited motors. It also covers stepper motors, explaining their specifications and full step and half step commutation sequences. Servo motors are defined as motors that can rotate with precision using a closed-loop feedback system to control the shaft position. Applications of different motor types are also listed.
CAPACITOR START INDUCTION MOTOR
The document summarizes different types of single-phase induction motors. It describes how squirrel cage induction motors work using a stator winding to induce currents in the rotor and how they operate at slightly lower than synchronous speed. It also explains two types of split-phase motors: resistance-start induction-run motors which use winding resistance to generate a starting torque, and capacitor-start induction-run motors which use a capacitor in series with the starting winding to produce a 90 degree phase difference between windings for starting torque.
single phaser IM.pptx
1. The document discusses different types of single-phase induction motors, including split-phase, capacitor start, permanent split capacitor, and shaded pole motors.
2. It explains the operating principles of each type, such as how they generate a rotating magnetic field to produce starting torque using auxiliary windings and capacitors.
3. The key applications of each motor type are mentioned, such as fans and blowers for permanent split capacitor motors and compressors for capacitor start capacitor run motors.
single phase Induction Motor-types, construction working.pptx
This document discusses different types of electric motors including AC and DC motors. It provides details on AC induction motors, the most common type used in industry. Key points include:
- AC induction motors have a stationary stator and a rotating rotor. They are self-starting, require no brushes, and are inexpensive and reliable.
- The rotor is either a squirrel cage or wound type. Squirrel cage motors are fixed speed while wound rotor motors can vary speed.
- Motors are started by using a capacitor, which is then disconnected for running (capacitor-start) or kept connected to improve power factor (capacitor-run).
- Three-phase induction motors are very common for
Synchronous generator construction
1) Synchronous generators have rotor windings that produce a rotating magnetic field and stator windings where 3-phase voltage is induced. They are driven by diesel engines, water turbines, or steam turbines.
2) The rotor magnetic poles can be either salient (sticking out) or cylindrical construction and are made of laminated steel to reduce eddy currents. Stator windings are used because connections are easier than on the rotating rotor.
3) Excitation systems use slip rings and brushes or brushless exciters to supply DC current to the rotor windings. This produced the rotating magnetic field needed to induce voltage in the stator windings.
Single phase induction motor
The single-phase motor, which are designed to operate from a single-phase supply, are manufactured in a large number of types to perform a wide variety of useful services in home, offices, factories, workshops and in a business establishments etc.
Small motors, particularly in the frictional kW sizes are better known than any other. In fact, most of the new products of the manufacturers of space vehicles, aircrafts, business machines and power tools etc. have been possible due to of the advances made in the design of frictional kW motors. Since the performance requirements of the various applications differ so widely, the motor manufacturing industry has developed many different types of such motors, each being designed to meet specific demands.
Single-phase motors may be classified as under, depending on their construction and method of starting:
1. Induction Motors (split-phase, capacitor and shaded-pole etc.)
2. Repulsion Motors (sometime called inductive-series motor)
3. AC Series Motor, and
4. Un-excited Synchronous Motors
Synchronous motor
A synchronous motor is electrically identical with an alternator or AC generator.
A given alternator ( or synchronous machine) can be used as a motor, when driven electrically.
Some characteristic features of a synchronous motor are as follows:
1. It runs either at synchronous speed or not at all i.e. while running it maintains a constant speed. The only way to change its speed is to vary the supply frequency (because NS=120f/P).
2. It is not inherently self-starting. It has to be run up to synchronous (or near synchronous) speed by some means, before it can be synchronized to the supply.
3. It is capable of being operated under a wide range of power factors, both lagging and leading. Hence, it can be used for power correction purposes, in addition to supplying torque to drive loads.
Dc machines ppt
A DC generator converts mechanical energy into electrical energy using electromagnetic induction. It consists of a magnetic frame, field poles, an armature, and a commutator. The armature rotates under the poles, cutting the magnetic flux and inducing an EMF. The commutator converts the alternating EMF into a pulsating DC voltage. DC generators are classified as separately excited, self-excited (series, shunt, compound), depending on how the field is connected. A DC motor operates on the principle that a current-carrying conductor in a magnetic field experiences a torque. It consists of an armature, field poles, a commutator, and brushes. The back EMF opposes the applied voltage
Module4.pptx
This document provides information on DC generators and DC motors. It discusses the components and workings of DC generators such as the armature, field coils, and commutator. It also covers DC motor types such as separately excited, shunt wound, series wound, and compound wound motors. The document discusses DC motor characteristics such as torque-current, speed-current, and speed-torque curves. It provides equations for back EMF, torque, and power in DC machines. Key aspects of DC generators and motors like electromagnetic induction, armature winding types, and motor speed control via back EMF are also summarized.
Synchronous machines
This document provides an overview of synchronous machines and synchronous condensers. It discusses key topics such as:
- The basic components and operating principles of synchronous machines and how they can function as motors or generators.
- Concepts like torque, power, energy and their relationships in synchronous machines.
- How synchronous machines synchronize to the frequency of the power system and their operating speed relationship.
- Power flow, internal and terminal voltages, and torque angle in synchronous machines.
- Losses that occur in synchronous machines and how efficiency is affected.
- The use of synchronous condensers to provide reactive power support through field excitation control while transferring little to no real power.
- Models for analyzing
DC Machines with explanation in detail of everything
A DC motor chapter is summarized in 3 sentences:
DC machines can operate as motors or generators and include DC motors which use a DC power source and have a stationary field coil and rotating armature. The speed of a DC motor is proportional to its back EMF and inversely proportional to the armature current. Examples show how to calculate the speed of DC motors under different load conditions by determining the back EMF using the motor's equivalent circuit.
Similar to 2730.ppt (20)
synchronous motor, Starting Torque, Types, Equivalent Circuit, Torque-speed c...
synchronous motor, Starting Torque, Types, Equivalent Circuit, Torque-speed c...
DC MACHINE-Motoring and generation, Armature circuit equation
DC MACHINE-Motoring and generation, Armature circuit equation
single phase Induction Motor-types, construction working.pptx
single phase Induction Motor-types, construction working.pptx
DC Machines with explanation in detail of everything
DC Machines with explanation in detail of everything
More from gulie
Fall11_4_13GezaJoos_IntegrationAndInterconnectionOfDistributedEnergyResources...
This document discusses issues related to integrating distributed energy resources (DER) into electric power grids. It provides background on DER definitions and classifications. It addresses grid integration and interconnection standards, including requirements for steady state and transient operations, protection, and islanding detection. The document outlines considerations for DER protection and control requirements to safely interconnect DER while maintaining grid reliability. It also presents examples of DER installations and research on advanced relay techniques for islanding detection.
tanveerppt-170427091913.pdf
This document discusses unintentional islanding of power systems with distributed resources like solar PV. It defines intentional and unintentional islands, and issues with unintentional islands like safety hazards, overvoltages, and loss of protection. Methods to detect unintentional islands are described, like reverse power relays and active techniques. Simulation results show one technique detecting an island within 0.5 cycles. Guidelines for assessing islanding risk are provided, and the future of anti-islanding techniques discussed, like the potential need for multiple active methods with reduced grid stiffness.
PPT material.pptx
The document discusses several methods for detecting power islands in grid-connected distributed generation systems. Passive detection schemes have a large non-detection zone while active methods can degrade power quality. Intelligent methods that use artificial intelligence techniques like neural networks, fuzzy logic, genetic algorithms and expert systems show promise for quickly and accurately detecting and classifying islanding conditions. The key advantages of these methods are their ability to learn adaptively and generalize while accurately detecting islanding conditions.
Gneration1.ppt
This document provides an overview of a course on power generation systems. The course covers conventional power sources like thermal and hydroelectric plants as well as non-conventional renewable sources like solar and wind. It discusses different methods of power generation including using steam to turn turbines, using the kinetic energy of moving water or wind, and exploiting nuclear reactions. The document compares various energy sources based on their initial costs, running costs, limitations, and sustainability. Students will learn about electrical power generation and the key players and sources that make up Pakistan's power sector.
PrabhuPresent.ppt
This document discusses the implications of distributed generation islanding on power system dynamics. It begins by defining islanding as the phenomenon where a distributed generator continues to power a location even after that location is electrically isolated from the central distribution network. If unintentional islanding occurs, it can pose safety hazards and damage equipment if the distributed generator's voltage and frequency are not properly regulated. The document also discusses out-of-phase reclosing, which produces high transient currents that can damage equipment. It then examines various active anti-islanding methods and notes their dynamic impacts, such as unnecessary tripping from undervoltage events. While anti-islanding protection prevents problems now, the document warns its effects could degrade power quality and stability as distributed
Adaptation of Chinese Culture .pptx
Adaptation of Chinese Culture Adaptation of Chinese Culture Adaptation of Chinese Culture Adaptation of Chinese Culture
Capacitor Cabinet-RAM 2.1-3600-0.3Y.pdf
The document provides installation instructions and specifications for capacitors, including that a minimum 50mm gap is required between capacitors, the air temperature must not exceed 65 degrees Celsius, and the bottom of copper bars should be at least 180mm above capacitor terminals to avoid magnetic interference. It also lists technical parameters for the capacitors such as voltage, frequency, amps, weight, and individual kvar and MFD specifications for 5 capacitors along with an internal wiring diagram and date.
1337683699.3104Lecture 07 - Synchronous machines.ppt
This document discusses the construction and operation of synchronous machines. It describes how synchronous generators have rotors that produce a rotating magnetic field from DC current in field windings. Synchronous motors have stators that produce a rotating magnetic field to turn the rotor. Large generators use brushless exciters to supply DC current to rotor windings without mechanical contact. Equivalent circuits are presented showing how armature reaction affects the relationship between internally generated and terminal voltages. Phasor diagrams illustrate voltage and current relationships for different power factors.
1337683622.6252Lecture 05 - DC motors.ppt
This document provides an overview of a lecture on DC motors. It begins with preliminary notes stating that DC motors have applications in automobiles, aircraft and portable electronics due to their ability to easily control speed. It then discusses the simplest DC machine, which consists of a single rotating loop of wire. The document explains how a voltage is induced in the rotating loop and how a commutator can be added to convert the alternating voltage to a direct voltage. It further discusses how this simplest machine demonstrates the basic principles of induced voltage, torque, and commutation that apply to real DC machines.
Basic Power Electronics Concepts_Ozipineci_ORNL.pdf
This document provides an introduction to power electronics. It defines power electronics as technology used to change the characteristics of electrical power to suit applications. The document outlines the history and types of power semiconductor devices like diodes, thyristors, MOSFETs and IGBTs. It also describes different types of power converters including rectifiers, inverters, and DC-DC converters. Thermal management of power devices is also discussed.
Electrical Engineering Objective Type Questions.pdf
This document contains a list of objective type questions for the Electrical Engineering department at Government College of Engineering in Bargur, prepared by assistant professor V. Arivumani. It includes 875 total questions organized under various topics related to electrical engineering, such as DC generators, DC motors, transformers, induction motors, synchronous motors, transmission and distribution, and cables. The questions cover concepts like generator construction, winding types, armature reaction, commutation, and parallel operation of generators. Sample questions and answers are provided for the topic of DC generators.
Job Hunting Techniques for UAE.pptx
This document provides job hunting techniques for those seeking employment in the United Arab Emirates (UAE). It outlines steps such as defining one's career interests, obtaining necessary documents like a passport and degree attestation, creating a strong resume and cover letter, applying for jobs online from home country or during a visit to UAE, and preparing for interviews. Useful online resources and job sites are also listed to facilitate the job searching process in UAE.
lachhab2013.pdf
This document presents a fractional order PID controller (FOPID)-Toolbox to design robust fractional PID controllers. The toolbox uses nonsmooth optimization techniques to optimize the parameters of fractional PIαDβ and (PID)n controllers to achieve a desired crossover frequency and phase margin. The goal is to develop a systematic method to optimize the parameters of these fractional order controllers based on expressing the control problem and requirements in terms of a desired open-loop response and using a loop shaping configuration. An algorithm is proposed that initializes the fractional orders, computes the gradient with respect to the orders, and iteratively updates the orders using steepest descent until convergence.
sikder2018.pdf
This document describes research into using a fractional order PID (FOPID) controller to control voltage fluctuations in an islanded microgrid with a single power source. The proposed FOPID controller has more tuning parameters than a standard PID controller, allowing it to better regulate the microgrid's output voltage under different load conditions and uncertainties. The controller is designed using an optimization technique to maximize system performance. Simulation results show the FOPID controller is effective at reducing voltage fluctuations and provides a fast, robust response for the microgrid system.
ppt nrel.pptx
This document discusses unintentional islands in power systems with distributed resources and methods to prevent them. It defines types of islands and issues they can cause. It outlines standard testing and requirements for distributed resources to detect and cease energizing an unintentional island within 2 seconds. Various passive, active and communication-based anti-islanding protection methods are described to meet this requirement.
SVM-plus-Phase-Shift Modulation Strategy for Single-Stage.pdf
This document proposes a new modulation strategy called SVM-plus-phase-shift (SVM-PS) modulation for a single-stage three-phase resonant AC-DC matrix converter with an LCL resonant tank. The strategy aims to achieve unity power factor and flexible control of active and reactive power transfer. It derives the relationship between switch states and line-frequency phase currents based on the fundamental component of the tank current. This allows simple control of current amplitude and phase via modulation of the AC and DC side switches based on voltage and current references. Simulation results show the proposed strategy reduces current distortion and ripple compared to conventional SVM.
Multiphase Converters.pdf
This document discusses multiphase power converters. It begins by defining multiphase converters as those with more than three phases, which are an extension of three-phase converters with additional legs. Multiphase converters are used in applications involving AC to DC, DC to AC, AC to AC, and DC to DC conversion. They provide advantages like enhanced torque density, lower torque pulsation, higher frequency ripple, lower per-leg current rating, greater fault tolerance, and lower harmonic losses. The document goes on to describe types of multiphase converters and their applications in areas like adjustable speed drives, renewable energy systems, and electric vehicles.
Grid Converters for Photovoltaic and Wind Power Systems - 2010 - Teodorescu -...
This document summarizes space vector transformations of three-phase systems. It discusses symmetrical components analysis in the frequency and time domains, which allows decomposition of an unbalanced three-phase system into positive, negative, and zero sequence components. It also describes Clarke's transformation to a stationary αβ0 reference frame, which defines three independent real components from the complex positive and negative sequence components.
09_chapter4SPACEVECTORPULSEWIDTHMODULATION.pdf
This document discusses space vector pulse width modulation (SVPWM) techniques for multilevel inverters. It begins by introducing SVPWM and explaining that it provides advantages over sinusoidal PWM, including better fundamental output voltage and improved harmonic performance. It then defines two-dimensional and three-dimensional space vectors and discusses how SVPWM can be implemented in both 2D and 3D. The document focuses on SVPWM for three-leg voltage source inverters, describing the voltage space vectors and how SVPWM can be used to synthesize the required output voltage vector through PWM of the switching state vectors.
Atp book
This document provides an introduction to using the ATP/EMTP software for simulating electrical systems transients. It discusses how to create data files for simulations using either ATPDraw, a graphical preprocessor, or by directly editing text files. It also describes running simulations and viewing results. The document is intended to introduce beginners to the ATP/EMTP software by following existing manuals on its usage and capabilities. It emphasizes that expertise requires experience working with the software and suggests consulting manuals and experts for in-depth knowledge of complex simulations.
More from gulie (20)
Fall11_4_13GezaJoos_IntegrationAndInterconnectionOfDistributedEnergyResources...
Fall11_4_13GezaJoos_IntegrationAndInterconnectionOfDistributedEnergyResources...
1337683699.3104Lecture 07 - Synchronous machines.ppt
1337683699.3104Lecture 07 - Synchronous machines.ppt
Basic Power Electronics Concepts_Ozipineci_ORNL.pdf
Basic Power Electronics Concepts_Ozipineci_ORNL.pdf
Electrical Engineering Objective Type Questions.pdf
Electrical Engineering Objective Type Questions.pdf
SVM-plus-Phase-Shift Modulation Strategy for Single-Stage.pdf
SVM-plus-Phase-Shift Modulation Strategy for Single-Stage.pdf
Grid Converters for Photovoltaic and Wind Power Systems - 2010 - Teodorescu -...
Grid Converters for Photovoltaic and Wind Power Systems - 2010 - Teodorescu -...
Recently uploaded
International Conference on NLP, Artificial Intelligence, Machine Learning an...
International Conference on NLP, Artificial Intelligence, Machine Learning and Applications (NLAIM 2024) offers a premier global platform for exchanging insights and findings in the theory, methodology, and applications of NLP, Artificial Intelligence, Machine Learning, and their applications. The conference seeks substantial contributions across all key domains of NLP, Artificial Intelligence, Machine Learning, and their practical applications, aiming to foster both theoretical advancements and real-world implementations. With a focus on facilitating collaboration between researchers and practitioners from academia and industry, the conference serves as a nexus for sharing the latest developments in the field.
ISPM 15 Heat Treated Wood Stamps and why your shipping must have one
For International shipping and maritime laws all wood must contain the ISPM 15 Stamp. Here is how and why.
Redefining brain tumor segmentation: a cutting-edge convolutional neural netw...
Medical image analysis has witnessed significant advancements with deep learning techniques. In the domain of brain tumor segmentation, the ability to
precisely delineate tumor boundaries from magnetic resonance imaging (MRI)
scans holds profound implications for diagnosis. This study presents an ensemble convolutional neural network (CNN) with transfer learning, integrating
the state-of-the-art Deeplabv3+ architecture with the ResNet18 backbone. The
model is rigorously trained and evaluated, exhibiting remarkable performance
metrics, including an impressive global accuracy of 99.286%, a high-class accuracy of 82.191%, a mean intersection over union (IoU) of 79.900%, a weighted
IoU of 98.620%, and a Boundary F1 (BF) score of 83.303%. Notably, a detailed comparative analysis with existing methods showcases the superiority of
our proposed model. These findings underscore the model’s competence in precise brain tumor localization, underscoring its potential to revolutionize medical
image analysis and enhance healthcare outcomes. This research paves the way
for future exploration and optimization of advanced CNN models in medical
imaging, emphasizing addressing false positives and resource efficiency.
Embedded machine learning-based road conditions and driving behavior monitoring
Car accident rates have increased in recent years, resulting in losses in human lives, properties, and other financial costs. An embedded machine learning-based system is developed to address this critical issue. The system can monitor road conditions, detect driving patterns, and identify aggressive driving behaviors. The system is based on neural networks trained on a comprehensive dataset of driving events, driving styles, and road conditions. The system effectively detects potential risks and helps mitigate the frequency and impact of accidents. The primary goal is to ensure the safety of drivers and vehicles. Collecting data involved gathering information on three key road events: normal street and normal drive, speed bumps, circular yellow speed bumps, and three aggressive driving actions: sudden start, sudden stop, and sudden entry. The gathered data is processed and analyzed using a machine learning system designed for limited power and memory devices. The developed system resulted in 91.9% accuracy, 93.6% precision, and 92% recall. The achieved inference time on an Arduino Nano 33 BLE Sense with a 32-bit CPU running at 64 MHz is 34 ms and requires 2.6 kB peak RAM and 139.9 kB program flash memory, making it suitable for resource-constrained embedded systems.
5214-1693458878915-Unit 6 2023 to 2024 academic year assignment (AutoRecovere...
Bigdata of technology
Iron and Steel Technology Roadmap - Towards more sustainable steelmaking.pdf
Iron and Steel Technology towards Sustainable Steelmaking
22CYT12-Unit-V-E Waste and its Management.ppt
Introduction- e - waste – definition - sources of e-waste– hazardous substances in e-waste - effects of e-waste on environment and human health- need for e-waste management– e-waste handling rules - waste minimization techniques for managing e-waste – recycling of e-waste - disposal treatment methods of e- waste – mechanism of extraction of precious metal from leaching solution-global Scenario of E-waste – E-waste in India- case studies.
学校原版美国波士顿大学毕业证学历学位证书原版一模一样
原版一模一样【微信：741003700 】【美国波士顿大学毕业证学历学位证书】【微信：741003700 】学位证，留信认证（真实可查，永久存档）offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原海外各大学 Bachelor Diploma degree, Master Degree Diploma
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
Advanced control scheme of doubly fed induction generator for wind turbine us...
This paper describes a speed control device for generating electrical energy on an electricity network based on the doubly fed induction generator (DFIG) used for wind power conversion systems. At first, a double-fed induction generator model was constructed. A control law is formulated to govern the flow of energy between the stator of a DFIG and the energy network using three types of controllers: proportional integral (PI), sliding mode controller (SMC) and second order sliding mode controller (SOSMC). Their different results in terms of power reference tracking, reaction to unexpected speed fluctuations, sensitivity to perturbations, and resilience against machine parameter alterations are compared. MATLAB/Simulink was used to conduct the simulations for the preceding study. Multiple simulations have shown very satisfying results, and the investigations demonstrate the efficacy and power-enhancing capabilities of the suggested control system.
Harnessing WebAssembly for Real-time Stateless Streaming Pipelines
Traditionally, dealing with real-time data pipelines has involved significant overhead, even for straightforward tasks like data transformation or masking. However, in this talk, we’ll venture into the dynamic realm of WebAssembly (WASM) and discover how it can revolutionize the creation of stateless streaming pipelines within a Kafka (Redpanda) broker. These pipelines are adept at managing low-latency, high-data-volume scenarios.
TIME DIVISION MULTIPLEXING TECHNIQUE FOR COMMUNICATION SYSTEM
Time Division Multiplexing (TDM) is a method of transmitting multiple signals over a single communication channel by dividing the signal into many segments, each having a very short duration of time. These time slots are then allocated to different data streams, allowing multiple signals to share the same transmission medium efficiently. TDM is widely used in telecommunications and data communication systems.
### How TDM Works
1. **Time Slots Allocation**: The core principle of TDM is to assign distinct time slots to each signal. During each time slot, the respective signal is transmitted, and then the process repeats cyclically. For example, if there are four signals to be transmitted, the TDM cycle will divide time into four slots, each assigned to one signal.
2. **Synchronization**: Synchronization is crucial in TDM systems to ensure that the signals are correctly aligned with their respective time slots. Both the transmitter and receiver must be synchronized to avoid any overlap or loss of data. This synchronization is typically maintained by a clock signal that ensures time slots are accurately aligned.
3. **Frame Structure**: TDM data is organized into frames, where each frame consists of a set of time slots. Each frame is repeated at regular intervals, ensuring continuous transmission of data streams. The frame structure helps in managing the data streams and maintaining the synchronization between the transmitter and receiver.
4. **Multiplexer and Demultiplexer**: At the transmitting end, a multiplexer combines multiple input signals into a single composite signal by assigning each signal to a specific time slot. At the receiving end, a demultiplexer separates the composite signal back into individual signals based on their respective time slots.
### Types of TDM
1. **Synchronous TDM**: In synchronous TDM, time slots are pre-assigned to each signal, regardless of whether the signal has data to transmit or not. This can lead to inefficiencies if some time slots remain empty due to the absence of data.
2. **Asynchronous TDM (or Statistical TDM)**: Asynchronous TDM addresses the inefficiencies of synchronous TDM by allocating time slots dynamically based on the presence of data. Time slots are assigned only when there is data to transmit, which optimizes the use of the communication channel.
### Applications of TDM
- **Telecommunications**: TDM is extensively used in telecommunication systems, such as in T1 and E1 lines, where multiple telephone calls are transmitted over a single line by assigning each call to a specific time slot.
- **Digital Audio and Video Broadcasting**: TDM is used in broadcasting systems to transmit multiple audio or video streams over a single channel, ensuring efficient use of bandwidth.
- **Computer Networks**: TDM is used in network protocols and systems to manage the transmission of data from multiple sources over a single network medium.
### Advantages of TDM
- **Efficient Use of Bandwidth**: TDM all
Eric Nizeyimana's document 2006 from gicumbi to ttc nyamata handball play
this notes have been created
by Eric36 at nyamata ttc
after readings
pe book for y2sme .
Literature Review Basics and Understanding Reference Management.pptx
Three-day training on academic research focuses on analytical tools at United Technical College, supported by the University Grant Commission, Nepal. 24-26 May 2024
CHINA’S GEO-ECONOMIC OUTREACH IN CENTRAL ASIAN COUNTRIES AND FUTURE PROSPECT
The rivalry between prominent international actors for dominance over Central Asia's hydrocarbon
reserves and the ancient silk trade route, along with China's diplomatic endeavours in the area, has been
referred to as the "New Great Game." This research centres on the power struggle, considering
geopolitical, geostrategic, and geoeconomic variables. Topics including trade, political hegemony, oil
politics, and conventional and nontraditional security are all explored and explained by the researcher.
Using Mackinder's Heartland, Spykman Rimland, and Hegemonic Stability theories, examines China's role
in Central Asia. This study adheres to the empirical epistemological method and has taken care of
objectivity. This study analyze primary and secondary research documents critically to elaborate role of
china’s geo economic outreach in central Asian countries and its future prospect. China is thriving in trade,
pipeline politics, and winning states, according to this study, thanks to important instruments like the
Shanghai Cooperation Organisation and the Belt and Road Economic Initiative. According to this study,
China is seeing significant success in commerce, pipeline politics, and gaining influence on other
governments. This success may be attributed to the effective utilisation of key tools such as the Shanghai
Cooperation Organisation and the Belt and Road Economic Initiative.
Computational Engineering IITH Presentation
This Presentation will give you a brief idea about what Computational Engineering at IIT Hyderabad has to offer.
2008 BUILDING CONSTRUCTION Illustrated - Ching Chapter 02 The Building.pdf
2008 BUILDING CONSTRUCTION Illustrated - Ching Chapter 02 The Building
Recently uploaded (20)
International Conference on NLP, Artificial Intelligence, Machine Learning an...
International Conference on NLP, Artificial Intelligence, Machine Learning an...
ISPM 15 Heat Treated Wood Stamps and why your shipping must have one
ISPM 15 Heat Treated Wood Stamps and why your shipping must have one
Redefining brain tumor segmentation: a cutting-edge convolutional neural netw...
Redefining brain tumor segmentation: a cutting-edge convolutional neural netw...
Embedded machine learning-based road conditions and driving behavior monitoring
Embedded machine learning-based road conditions and driving behavior monitoring
5214-1693458878915-Unit 6 2023 to 2024 academic year assignment (AutoRecovere...
5214-1693458878915-Unit 6 2023 to 2024 academic year assignment (AutoRecovere...
Iron and Steel Technology Roadmap - Towards more sustainable steelmaking.pdf
Iron and Steel Technology Roadmap - Towards more sustainable steelmaking.pdf
Advanced control scheme of doubly fed induction generator for wind turbine us...
Advanced control scheme of doubly fed induction generator for wind turbine us...
Harnessing WebAssembly for Real-time Stateless Streaming Pipelines
Harnessing WebAssembly for Real-time Stateless Streaming Pipelines
TIME DIVISION MULTIPLEXING TECHNIQUE FOR COMMUNICATION SYSTEM
TIME DIVISION MULTIPLEXING TECHNIQUE FOR COMMUNICATION SYSTEM
Eric Nizeyimana's document 2006 from gicumbi to ttc nyamata handball play
Eric Nizeyimana's document 2006 from gicumbi to ttc nyamata handball play
Literature Review Basics and Understanding Reference Management.pptx
Literature Review Basics and Understanding Reference Management.pptx
CHINA’S GEO-ECONOMIC OUTREACH IN CENTRAL ASIAN COUNTRIES AND FUTURE PROSPECT
CHINA’S GEO-ECONOMIC OUTREACH IN CENTRAL ASIAN COUNTRIES AND FUTURE PROSPECT
2008 BUILDING CONSTRUCTION Illustrated - Ching Chapter 02 The Building.pdf
2008 BUILDING CONSTRUCTION Illustrated - Ching Chapter 02 The Building.pdf
Generative AI leverages algorithms to create various forms of content
Generative AI leverages algorithms to create various forms of content
2730.ppt
- 1. Synchronous Motors and Generators
- 2. Synchronous Motors • Constant-speed machine • Propulsion for SS “Queen Elizabeth II” – 44 MW – 10 kV – 60 Hz – 50 pole – 144 r/min
- 3. Synchronous Motors (continued) • Construction – Stator identical to that of a three-phase induction motor – now called the “armature” – Energize from a three-phase supply and develop the rotating magnetic field – Rotor has a DC voltage applied (excitation) – Rotor could be a permanent-magnet type
- 4. Synchronous Motors (continued) • Operation – Magnetic field of the rotor “locks” with the rotating magnetic field – rotor turns at synchronous speed
- 6. Salient-Pole Rotor with brushless excitation
- 7. Synchronous Motor Starting • Get motor to maximum speed (usually with no load) • Energize the rotor with a DC voltage
- 8. Salient-Pole Motor operating at both no-load and loaded conditions Angle δ is the power angle, load angle, or torque angle
- 9. Rotating Field Flux and Counter-emf • Rotating field flux f due to magnetic field in the rotor. A “speed” voltage, “counter-emf”, or “excitation” voltage Ef is generated and acts in opposition to the applied voltage. • Ef = nsfkf
- 10. Equivalent Circuit of a Synchronous Motor Armature (One Phase) ( ) T a a a l a ar f s l ar T f a a s T f a s V I R I jX I X E X X X V E I R jX V E I Z
- 11. Phasor Diagram for one phase of a Synchronous Motor Armature
- 14. Motor-to-Generator Transition (cont) • Begin with motor driven from the infinite bus and the turbine torque in the same direction as the motor torque. • The motor operates normally, driving the water pump.
- 15. Motor-to-Generator Transition (cont) VT = Ef + IajXs Phasor Diagram
- 16. Allow the Turbine to take part load The power angle decreases to zero and then becomes positive Excitation voltage is not changed and the vector traces an arc Motor becomes a generator as δ becomes > or = zero
- 17. Motor Action Power angle is negative
- 18. Motor to Generator Transition Power angle is now = 0
- 19. Generator Action Power angle is positive Note: Iacosθi is reversed!
- 20. Generator Action (cont) • In order for Ia to reverse direction, voltage Ef must become a source voltage • Ef > VT Ia