The document discusses different types of single-phase induction motors. It describes how a shaded pole motor works by using shading coils to create a rotating magnetic field for starting torque. It also explains split-phase motors, capacitor-start motors, and permanent split-capacitor motors, comparing how each type introduces a phase shift to generate a rotating magnetic field for starting.
This document summarizes three types of single-phase induction motors: split-phase induction motors, capacitor-type single-phase induction motors, and shaded-pole motors. It describes the basic construction and working principles of each type of motor. Split-phase motors use an auxiliary winding to provide starting torque. Capacitor motors add a capacitor, either temporarily or permanently, to improve starting torque. Shaded-pole motors produce a rotating magnetic field through the use of shaded poles on the stator. The document provides examples of applications for each type and includes diagrams of their electrical configurations and torque-speed characteristics.
Speed control by kramer method (Karan)KARAN SHARMA
This document describes speed control of induction motors using the Kramer method. It begins with an introduction to induction motors, including their working principles and the need for speed control. It then discusses various speed control methods for induction motors, including voltage/frequency control, adding resistance to the rotor circuit, and injecting slip frequency voltage into the rotor. Chapter 2 introduces the Kramer method for speed control. Chapter 3 will describe the equipment used for implementing the Kramer method.
This document discusses different types of single-phase induction motors, including split-phase motors, capacitor-start motors, capacitor-start capacitor-run motors, permanent split-capacitor motors, and shaded-pole motors. It explains the operating principles of each type of motor and how they achieve self-starting. Key details are provided on the windings, capacitors, and speed-torque characteristics of each motor type. The document also covers universal motors and their ability to operate on AC or DC power supplies.
The document summarizes the working principle, construction, and types of single-phase induction motors. It describes:
1) The working principle is explained using double revolving field theory, where the pulsating magnetic field is divided into two fields rotating in opposite directions, generating opposing torques.
2) The construction is similar to three-phase induction motors, using a squirrel cage rotor. Stators have two windings placed 90 degrees apart connected in parallel to the single-phase supply.
3) Types include split-phase, capacitor-start, capacitor-start capacitor-run, two-value capacitor, and shaded-pole motors. Capacitor motors use capacitors in series with starting wind
An induction motor is a common electric motor where the rotating magnetic field in the stator induces current in the rotor to generate torque. It has a simple and rugged construction, is very reliable and cost-effective. Induction motors are widely used in industrial equipment and household appliances. The current induced in the rotor depends on factors like slip and magnetic saturation, which influence the motor's speed-torque characteristics. Finite element analysis is useful for investigating these characteristics during design. While induction motors are commonly used, their modeling involves complexities like rotor skew, harmonic effects, and nonlinear materials behavior.
The document provides an overview of induction motors, including:
1. The construction and basic concepts of induction motors, including how torque is produced through induction of voltage and current in the rotor.
2. The development of an equivalent circuit model for induction motors based on a transformer model, including modeling of the stator, rotor, and magnetic properties.
3. How the rotor circuit model accounts for variations in rotor voltage and frequency with slip speed, and how this affects the rotor resistance and reactance values in the model.
1. Chapter seven discusses induction motors, including their construction, basic concepts of operation, and equivalent circuit modeling.
2. Induction motors operate based on inducing voltages and currents in the rotor through electromagnetic induction from the stator magnetic field.
3. The chapter covers topics such as rotor slip, torque production, torque-speed characteristics, and methods for speed control.
This document summarizes three types of single-phase induction motors: split-phase induction motors, capacitor-type single-phase induction motors, and shaded-pole motors. It describes the basic construction and working principles of each type of motor. Split-phase motors use an auxiliary winding to provide starting torque. Capacitor motors add a capacitor, either temporarily or permanently, to improve starting torque. Shaded-pole motors produce a rotating magnetic field through the use of shaded poles on the stator. The document provides examples of applications for each type and includes diagrams of their electrical configurations and torque-speed characteristics.
Speed control by kramer method (Karan)KARAN SHARMA
This document describes speed control of induction motors using the Kramer method. It begins with an introduction to induction motors, including their working principles and the need for speed control. It then discusses various speed control methods for induction motors, including voltage/frequency control, adding resistance to the rotor circuit, and injecting slip frequency voltage into the rotor. Chapter 2 introduces the Kramer method for speed control. Chapter 3 will describe the equipment used for implementing the Kramer method.
This document discusses different types of single-phase induction motors, including split-phase motors, capacitor-start motors, capacitor-start capacitor-run motors, permanent split-capacitor motors, and shaded-pole motors. It explains the operating principles of each type of motor and how they achieve self-starting. Key details are provided on the windings, capacitors, and speed-torque characteristics of each motor type. The document also covers universal motors and their ability to operate on AC or DC power supplies.
The document summarizes the working principle, construction, and types of single-phase induction motors. It describes:
1) The working principle is explained using double revolving field theory, where the pulsating magnetic field is divided into two fields rotating in opposite directions, generating opposing torques.
2) The construction is similar to three-phase induction motors, using a squirrel cage rotor. Stators have two windings placed 90 degrees apart connected in parallel to the single-phase supply.
3) Types include split-phase, capacitor-start, capacitor-start capacitor-run, two-value capacitor, and shaded-pole motors. Capacitor motors use capacitors in series with starting wind
An induction motor is a common electric motor where the rotating magnetic field in the stator induces current in the rotor to generate torque. It has a simple and rugged construction, is very reliable and cost-effective. Induction motors are widely used in industrial equipment and household appliances. The current induced in the rotor depends on factors like slip and magnetic saturation, which influence the motor's speed-torque characteristics. Finite element analysis is useful for investigating these characteristics during design. While induction motors are commonly used, their modeling involves complexities like rotor skew, harmonic effects, and nonlinear materials behavior.
The document provides an overview of induction motors, including:
1. The construction and basic concepts of induction motors, including how torque is produced through induction of voltage and current in the rotor.
2. The development of an equivalent circuit model for induction motors based on a transformer model, including modeling of the stator, rotor, and magnetic properties.
3. How the rotor circuit model accounts for variations in rotor voltage and frequency with slip speed, and how this affects the rotor resistance and reactance values in the model.
1. Chapter seven discusses induction motors, including their construction, basic concepts of operation, and equivalent circuit modeling.
2. Induction motors operate based on inducing voltages and currents in the rotor through electromagnetic induction from the stator magnetic field.
3. The chapter covers topics such as rotor slip, torque production, torque-speed characteristics, and methods for speed control.
This document provides an overview of synchronous motors. It discusses how synchronous motors operate based on interaction between the stator and rotor magnetic fields. The rotor rotates in synchronization with the rotating stator magnetic field. Damper windings or an auxiliary induction motor are used to start the synchronous motor and bring it up to near synchronous speed before energizing the rotor field. Synchronous motors provide constant synchronous speed and can operate at leading, lagging or unity power factor, making them suitable for applications requiring precise speed control or power factor correction.
In a single phase induction motor:
1) The stator generates a pulsating magnetic field rather than a rotating magnetic field, as there is only one winding supplied by a single phase power source.
2) The magnetic field strength varies sinusoidally with time but remains stationary in space.
3) Without additional starting mechanisms, the rotor cannot start rotating due to the lack of a rotating magnetic field and resulting starting torque.
The document discusses induction motors. It explains that an induction motor works by electromagnetic induction, where the alternating current in the stator produces a rotating magnetic field that induces current in the rotor and causes it to turn. It describes the basic components of induction motors including the stator, rotor, and housing. It also discusses how varying the frequency of the alternating current supply can be used to control the motor's speed.
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
The document discusses three-phase induction motors. It begins by explaining that induction motors are the most common electric motors used in industry due to their simple and rugged design. It then covers the basic principles of operation, describing how a rotating magnetic field induces current in the rotor. It discusses the two main types - squirrel cage and wound rotor - and describes their construction features. The document also covers motor speed, how it is lower than synchronous speed due to slip, and the similarities and differences between induction motors and transformers. It concludes by listing the main power losses that occur in induction machines.
This document provides an overview of single phase induction motors. It discusses the construction of single phase induction motors including the stator and squirrel cage rotor. It explains the working principle, describing how a single phase AC supply to the stator produces a rotating magnetic field that induces current in the rotor. It also introduces the double field revolving theory to explain why single phase motors are not self-starting. The document discusses the equivalent circuit of induction motors and describes no load and blocked rotor tests that are used to determine the circuit parameters.
The document discusses AC motors and their construction. There are two main types of AC motors depending on the rotor: induction motors, which run slightly slower than the supply frequency, and synchronous motors, which rotate at the exact supply frequency. AC motors typically feature laminated iron core rotors with slots for conductors. The most common type of rotor uses cast aluminum conductors and end rings, forming a "squirrel cage" that rotates when the moving magnetic field induces current in the shorted conductors. The synchronous speed of an AC motor, determining how fast its magnetic field rotates, depends on the power supply frequency and number of poles in the stator.
The document discusses induction motors, including their advantages of being robust with no brushes or contacts on the rotor shaft, having a high power to weight ratio compared to DC motors, and being lower cost and easy to manufacture. It describes the main parts of an induction motor including the squirrel cage rotor and stator windings. It also explains how induction motors work by generating a rotating magnetic field from the stator that induces current in the rotor and causes it to rotate slightly slower than the magnetic field.
Get listing of manufacturer, exporter and supplier of single phase induction motors.These motors are mainly used for producing rotational torque in electromagnetic machines.
1. Three phase induction motors have a rotating magnetic field produced by a three phase stator winding that causes the rotor to turn.
2. The rotor can be either a squirrel cage (copper or aluminum bars short circuited by end rings) or wound construction.
3. Starters are used to reduce the starting current by lowering the supply voltage and improve starting torque by increasing rotor resistance during start up. Common starting methods include direct-on-line, star-delta, and auto transformer starters.
The cranking circuit includes the starter motor, battery, starter solenoid, and ignition switch. The starter motor uses electromagnetic principles to convert electrical energy from the battery into mechanical rotation of the engine. When the ignition switch is turned on, current flows through the solenoid and starter motor to engage the drive pinion with the flywheel and rotate the engine until it starts.
The document discusses 3-phase induction motors. It describes how a rotating magnetic field is produced in the stator by 3-phase currents, which induces currents in the rotor and causes it to rotate. It discusses the construction of squirrel cage and wound rotors. It also covers key concepts like slip, torque production, equivalent circuits, power flow, and torque-speed characteristics of 3-phase induction motors.
An AC motor operates using a rotating magnetic field produced by an alternating current to generate torque and turn the rotor shaft. There are two main types - synchronous motors where the rotor rotates at the exact supply frequency, and induction motors where the rotor rotates slightly slower. Induction motors are the most common and operate using electromagnetic induction to induce currents in the rotor and generate torque. Squirrel cage rotors are the most widely used type and consist of conductive bars in the rotor that induce currents to generate a magnetic field and turn the shaft.
1) Single phase induction motors use a split phase winding or capacitor start method to generate a rotating magnetic field for starting.
2) Synchronous motors operate at a constant synchronous speed and use a damper winding, pony motor, or DC motor method to reach synchronous speed before loading.
3) V curves show the relationship between armature current, field current, and excitation voltage in synchronous motors.
The document discusses synchronous motors, including their definition, construction, working principle, types, advantages, and applications. Synchronous motors run at a constant synchronous speed determined by the supply frequency, and consist of a stationary stator and rotating rotor. The stator contains three-phase windings powered by AC, while the rotor is excited by DC. The rotor synchronizes with the rotating stator magnetic field. Synchronous motors provide constant speed operation and are used for applications requiring precise speed control or power factor correction.
This document discusses different types of single-phase induction motors and how they are made self-starting. It describes the construction and working of a basic single-phase induction motor. Such a motor is not self-starting because it produces an alternating flux that cannot cause rotation on its own. The document then explains various methods used to make single-phase motors self-starting, including split-phase, capacitor-start, and shaded-pole designs. It provides details on how split-phase and capacitor-start motors introduce a phase difference between windings using a starting winding and capacitor, producing a revolving magnetic field that can start the motor.
DC and AC motors convert electrical energy to mechanical energy through electromagnetic interaction between a magnetic field and electric current. DC motors use direct current and have commutators, while AC motors use alternating current and have either induction or synchronous designs. Induction motors generate torque through electromagnetic induction, and synchronous motors synchronize the rotor speed to the supply frequency to maintain a constant speed under varying loads. Both motor types have various applications depending on their torque, speed, and load characteristics.
The document discusses induction motors, which are asynchronous AC motors that operate below synchronous speed. It describes the two main types - single phase and three phase induction motors. Three phase induction motors are commonly used in industry due to their ability to provide bulk power conversion from electrical to mechanical power. The document then discusses the construction and working principles of three phase induction motors in detail, including their stator, rotor, and how rotational motion is induced in the rotor via electromagnetic induction from the rotating stator magnetic field.
This short document does not contain any meaningful information to summarize in 3 sentences or less. It consists of a repeated phrase "Created by www.usb20.idv.tw" with no other context provided.
This document provides an overview of synchronous motors. It discusses how synchronous motors operate based on interaction between the stator and rotor magnetic fields. The rotor rotates in synchronization with the rotating stator magnetic field. Damper windings or an auxiliary induction motor are used to start the synchronous motor and bring it up to near synchronous speed before energizing the rotor field. Synchronous motors provide constant synchronous speed and can operate at leading, lagging or unity power factor, making them suitable for applications requiring precise speed control or power factor correction.
In a single phase induction motor:
1) The stator generates a pulsating magnetic field rather than a rotating magnetic field, as there is only one winding supplied by a single phase power source.
2) The magnetic field strength varies sinusoidally with time but remains stationary in space.
3) Without additional starting mechanisms, the rotor cannot start rotating due to the lack of a rotating magnetic field and resulting starting torque.
The document discusses induction motors. It explains that an induction motor works by electromagnetic induction, where the alternating current in the stator produces a rotating magnetic field that induces current in the rotor and causes it to turn. It describes the basic components of induction motors including the stator, rotor, and housing. It also discusses how varying the frequency of the alternating current supply can be used to control the motor's speed.
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
The document discusses three-phase induction motors. It begins by explaining that induction motors are the most common electric motors used in industry due to their simple and rugged design. It then covers the basic principles of operation, describing how a rotating magnetic field induces current in the rotor. It discusses the two main types - squirrel cage and wound rotor - and describes their construction features. The document also covers motor speed, how it is lower than synchronous speed due to slip, and the similarities and differences between induction motors and transformers. It concludes by listing the main power losses that occur in induction machines.
This document provides an overview of single phase induction motors. It discusses the construction of single phase induction motors including the stator and squirrel cage rotor. It explains the working principle, describing how a single phase AC supply to the stator produces a rotating magnetic field that induces current in the rotor. It also introduces the double field revolving theory to explain why single phase motors are not self-starting. The document discusses the equivalent circuit of induction motors and describes no load and blocked rotor tests that are used to determine the circuit parameters.
The document discusses AC motors and their construction. There are two main types of AC motors depending on the rotor: induction motors, which run slightly slower than the supply frequency, and synchronous motors, which rotate at the exact supply frequency. AC motors typically feature laminated iron core rotors with slots for conductors. The most common type of rotor uses cast aluminum conductors and end rings, forming a "squirrel cage" that rotates when the moving magnetic field induces current in the shorted conductors. The synchronous speed of an AC motor, determining how fast its magnetic field rotates, depends on the power supply frequency and number of poles in the stator.
The document discusses induction motors, including their advantages of being robust with no brushes or contacts on the rotor shaft, having a high power to weight ratio compared to DC motors, and being lower cost and easy to manufacture. It describes the main parts of an induction motor including the squirrel cage rotor and stator windings. It also explains how induction motors work by generating a rotating magnetic field from the stator that induces current in the rotor and causes it to rotate slightly slower than the magnetic field.
Get listing of manufacturer, exporter and supplier of single phase induction motors.These motors are mainly used for producing rotational torque in electromagnetic machines.
1. Three phase induction motors have a rotating magnetic field produced by a three phase stator winding that causes the rotor to turn.
2. The rotor can be either a squirrel cage (copper or aluminum bars short circuited by end rings) or wound construction.
3. Starters are used to reduce the starting current by lowering the supply voltage and improve starting torque by increasing rotor resistance during start up. Common starting methods include direct-on-line, star-delta, and auto transformer starters.
The cranking circuit includes the starter motor, battery, starter solenoid, and ignition switch. The starter motor uses electromagnetic principles to convert electrical energy from the battery into mechanical rotation of the engine. When the ignition switch is turned on, current flows through the solenoid and starter motor to engage the drive pinion with the flywheel and rotate the engine until it starts.
The document discusses 3-phase induction motors. It describes how a rotating magnetic field is produced in the stator by 3-phase currents, which induces currents in the rotor and causes it to rotate. It discusses the construction of squirrel cage and wound rotors. It also covers key concepts like slip, torque production, equivalent circuits, power flow, and torque-speed characteristics of 3-phase induction motors.
An AC motor operates using a rotating magnetic field produced by an alternating current to generate torque and turn the rotor shaft. There are two main types - synchronous motors where the rotor rotates at the exact supply frequency, and induction motors where the rotor rotates slightly slower. Induction motors are the most common and operate using electromagnetic induction to induce currents in the rotor and generate torque. Squirrel cage rotors are the most widely used type and consist of conductive bars in the rotor that induce currents to generate a magnetic field and turn the shaft.
1) Single phase induction motors use a split phase winding or capacitor start method to generate a rotating magnetic field for starting.
2) Synchronous motors operate at a constant synchronous speed and use a damper winding, pony motor, or DC motor method to reach synchronous speed before loading.
3) V curves show the relationship between armature current, field current, and excitation voltage in synchronous motors.
The document discusses synchronous motors, including their definition, construction, working principle, types, advantages, and applications. Synchronous motors run at a constant synchronous speed determined by the supply frequency, and consist of a stationary stator and rotating rotor. The stator contains three-phase windings powered by AC, while the rotor is excited by DC. The rotor synchronizes with the rotating stator magnetic field. Synchronous motors provide constant speed operation and are used for applications requiring precise speed control or power factor correction.
This document discusses different types of single-phase induction motors and how they are made self-starting. It describes the construction and working of a basic single-phase induction motor. Such a motor is not self-starting because it produces an alternating flux that cannot cause rotation on its own. The document then explains various methods used to make single-phase motors self-starting, including split-phase, capacitor-start, and shaded-pole designs. It provides details on how split-phase and capacitor-start motors introduce a phase difference between windings using a starting winding and capacitor, producing a revolving magnetic field that can start the motor.
DC and AC motors convert electrical energy to mechanical energy through electromagnetic interaction between a magnetic field and electric current. DC motors use direct current and have commutators, while AC motors use alternating current and have either induction or synchronous designs. Induction motors generate torque through electromagnetic induction, and synchronous motors synchronize the rotor speed to the supply frequency to maintain a constant speed under varying loads. Both motor types have various applications depending on their torque, speed, and load characteristics.
The document discusses induction motors, which are asynchronous AC motors that operate below synchronous speed. It describes the two main types - single phase and three phase induction motors. Three phase induction motors are commonly used in industry due to their ability to provide bulk power conversion from electrical to mechanical power. The document then discusses the construction and working principles of three phase induction motors in detail, including their stator, rotor, and how rotational motion is induced in the rotor via electromagnetic induction from the rotating stator magnetic field.
This short document does not contain any meaningful information to summarize in 3 sentences or less. It consists of a repeated phrase "Created by www.usb20.idv.tw" with no other context provided.
Subnetting es la técnica de segmentar redes lógicamente tomando bits de la dirección IP del host para crear un campo de subred. Esto permite dividir una red grande en subredes más pequeñas sin necesidad de direcciones IP adicionales. Al robar bits del campo de host, se crean nuevos campos para la subred y el host, permitiendo organizar la red de manera más eficiente.
Aerospace engineers design, manufacture, test, and inspect aircraft and spacecraft. They work full-time including some overtime using computers for CAD, software design, and simulations. Aerospace engineering degrees require 4 years but a master's is recommended. Tuition at Iowa State University is around $19,000 and pay ranges from $68,000 to $104,500 annually with benefits like health insurance, 401k, education assistance, and paid holidays. The field has moderate growth around 1-2% annually.
Naadam is a traditional Mongolian festival celebrated annually in Mongolia from July 11-13. It commemorates Mongolia's declaration of independence in 1921. The main events of Naadam include Mongolian wrestling, horse racing, and archery competitions. Naadam is held in the national stadium in the capital of Ulaanbaatar and is the most widely watched festival among Mongolian people, celebrating their culture and history.
Este documento apresenta uma apostila sobre aeroportos produzida pelo Programa de Educação Tutorial da Universidade Federal de Santa Catarina. A apostila contém nove módulos que abordam tópicos como organização do transporte aéreo, mecânica de voo, dimensionamento de pistas e pavimentos, drenagem, sinalização e acessos terrestres. A apostila foi produzida com a colaboração de bolsistas do PET para fins educacionais.
Channel estimation error model for srs in LTEseryiop2
This document provides an abstract for a master's thesis project on modeling the channel estimation error for sounding reference signals (SRS) in LTE. The thesis proposes a method to model the channel estimation error based on training data from a link simulator. The model estimates the standard deviation of channel estimates as a function of interfering signal powers and other factors. The model will then be implemented in a system simulator to more realistically evaluate the performance of radio resource management algorithms using sounding. The thesis discusses LTE concepts like SRS, channel estimation, and proposes hypotheses for factors that influence the estimation error to develop the model.
The document contains 40 multiple choice questions and answers related to electrical engineering topics. Some key topics covered include:
- Transformers and how their windings are linked
- Operation of synchronous motors, induction motors, and DC motors
- Motor speed control based on field current and terminal voltage
- Power factors of different motor types
- Generation and transmission voltages
- Transformer voltage regulation
- Stepper motor operation
The questions cover fundamental concepts in electrical circuits, motors, transformers, generators and other power systems components. The objective type questions and answers provide a high-level overview of important electrical engineering concepts.
Single-phase induction motors use two winding arrangements to generate a rotating magnetic field and start the motor without an external power source. They have a main winding and auxiliary starting winding arranged perpendicularly in the stator. The rotor is a squirrel cage design. Various starting methods like split-phase, capacitor-start, and permanent split capacitor use resistances or capacitors to introduce a phase difference between the windings to generate torque.
Single phasing of three phase induction motorJUNAID SK
This document is a lab report on experimentally studying the behavior of a three phase induction motor under normal and single phasing conditions. It includes an introduction to induction motors, three phase induction motors, and single phasing. The experimental setup section describes the aim, apparatus, theory, circuit diagram, procedure, observations, and conclusions from testing a three phase induction motor under normal and single phasing supply conditions. The report is submitted to fulfill requirements for a Bachelor of Technology degree.
Chapter5 dek 3143 dae 32303 9 (nota tambahan)mkazree
Single-phase motors are commonly used when 3-phase power is unavailable. There are several types of single-phase induction motors that differ in their starting mechanisms, including split-phase, capacitor-start, permanent split-capacitor, capacitor-start/capacitor-run, and shaded-pole motors. These motor types are suited for different applications depending on their starting torque, running efficiency, and cost.
The document discusses various types of synchronous and special machines. It covers the construction and operating principles of synchronous motors, permanent magnet DC motors, stepper motors, brushless DC motors, and servo motors. Synchronous motors are described as operating at a constant synchronous speed determined by supply frequency. Methods to start synchronous motors include using pony motors, damper windings, or operating them as slip ring induction motors initially. Stepper motors rotate in fixed angular steps when powered by pulse signals. Servo motors are used in applications requiring precise speed and position control.
1. Single-phase induction motors use a double-field revolving theory to produce rotation, representing the alternating flux as two counter-rotating fluxes to overcome the lack of self-starting torque in a single-phase motor.
2. Various methods are used to make single-phase induction motors self-starting, including split-phase, capacitor-start and capacitor-run, and shaded-pole techniques.
3. Split-phase motors add a starting winding to introduce a phase difference between currents to produce a rotating field. Capacitor motors improve this effect with a capacitor. Shaded-pole motors use shading coils to shift the magnetic field.
This document discusses AC motors, including three-phase induction motors, single-phase induction motors, and brushless DC motors. It provides details on their construction, operation principles, advantages, limitations, torque-speed characteristics, and speed control methods. Three-phase induction motors are widely used due to their simple and rugged construction, reliability, low cost, and high efficiency. Single-phase induction motors require auxiliary circuits for self-starting. Methods to control induction motor speed include variable voltage variable frequency control and field oriented control.
The single-phase induction motor uses two windings arranged perpendicularly on an iron core stator - a main winding and an auxiliary starting winding. It requires a mechanism to generate a rotating magnetic field to start, such as a capacitor, resistance, or secondary winding with phase shift. Common starting methods are split-phase, capacitor-start, and shaded-pole. Split-phase uses an auxiliary winding with phase shift. Capacitor-start uses a capacitor in series with the auxiliary winding. Shaded-pole uses shaded bands to generate phase shift. Applications depend on starting torque requirements.
An AC motor uses an alternating current to generate a rotating magnetic field in the stator that interacts with the rotor. The two main types are induction and synchronous motors. Induction motors rely on electromagnetic induction to generate a current in the rotor from the stator's rotating magnetic field, causing the rotor to turn at a slower synchronous speed. Squirrel cage rotors have embedded conductors in a striped pattern and are simple, reliable, and cheaper but have poor starting torque. Wound rotors have coils connected through slip rings that allow reducing starting current and enabling speed control.
In this slide given description about different Type of Single phase induction Motor.
i.e.Capacitor start motor
Permanent capacitor motor
Capacitor start capacitor run motor
The document discusses different types of AC motors, including induction motors and synchronous motors. Induction motors operate slightly slower than the supply frequency, while synchronous motors rotate exactly at the supply frequency. Common types of AC motors include squirrel cage motors and wound rotor motors. Squirrel cage motors have conductors in the rotor that produce torque from induced currents, while wound rotor motors have insulated windings in the rotor that allow external resistance to control starting torque and speed.
The document summarizes the working principle, construction, and types of single-phase induction motors. It discusses the double revolving field theory to explain how the motor operates using a pulsating magnetic field divided into forward and reverse rotating fields. It describes the construction as similar to three-phase motors with a squirrel cage rotor. The main types covered are split-phase, capacitor-start, capacitor-start capacitor-run, two-value capacitor, and shaded-pole motors.
This document provides an overview of AC motors and their types. It discusses the basic principles of how electric motors work by using magnets to create motion. There are two main types of AC motors: synchronous motors and induction motors. Induction motors are further divided into single-phase and three-phase induction motors. Three-phase induction motors are the most common and can have either a squirrel cage or wound rotor. Synchronous motors rotate at a constant synchronous speed regardless of load but require special mechanisms to be self-starting. The document compares the characteristics and applications of different AC motor types.
This document discusses different types of AC motors. It describes induction motors, including single-phase and three-phase induction motors. Three-phase induction motors can have either a squirrel cage or wound rotor. Synchronous motors are also discussed, which rotate at a constant synchronous speed. While synchronous motors have high efficiency, they require auxiliary equipment to allow for self-starting. The document compares different AC motor types and provides examples of their common applications.
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.
The document discusses different types of AC motors including induction motors and synchronous motors. It provides details on their construction, working principles, starting methods, torque characteristics and applications. Some key points covered are:
- Induction motors are the most commonly used AC motors due to their simple and rugged construction. They operate at a slightly lower speed than synchronous speed.
- Synchronous motors rotate exactly at the synchronous speed of the rotating magnetic field. They cannot be started directly and require an external prime mover to start.
- Both induction and synchronous motors require maintenance like cleaning electrical connections and checking for overheating to ensure safe and efficient operation.
1) AC motors can be categorized as induction motors or synchronous motors. Induction motors are the most common type and can be single-phase or three-phase.
2) Three-phase induction motors have a stationary stator and a rotating rotor. The rotor can be a squirrel cage design or wound rotor design. Squirrel cage rotors are simpler and require less maintenance.
3) Synchronous motors rotate at exactly the same speed as the frequency of the power supply. They are more efficient than induction motors but require an external mechanism to start rotating.
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.
This document discusses different types of single-phase induction motors, including their operating principles, starting methods, and characteristics. It describes split-phase, capacitor-start, capacitor-run, and capacitor-start/capacitor-run induction motors. It also discusses shaded-pole induction motors and their applications in small, low-power devices.
Unveiling the Dynamic Personalities, Key Dates, and Horoscope Insights: Gemin...my Pandit
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Lesson 6
1. Ho Chi Minh University of Industry
Lesson 6:
SINGLE-PHASE AC INDUCTION MOTORS
Continue:
Reduced:
Disconnected:
Connected:
Generate:
Starting:
common
shaded pole motor:
Reading passage 1:
A poly-phase induction motor will continue to rotate
even if one phase is disconnected, at reduced torque.
However, a poly-phase motor at standstill will not
generate any net starting torque if connected only to a
single-phase supply. The key to the design of single-
phase motors, then, is to provide a rotating magnetic
field to produce starting torque.
A common single-phase motor is the shaded pole motor,
which is used in devices requiring lower torque, such as
electric fans or other small household appliances. In this
motor, small single-turn copper "shading coils" create
the moving magnetic field. Part of each pole is encircled
by a copper coil or strap; the induced current in the strap
opposes the change of flux through the coil (Lenz's
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2. Ho Chi Minh University of Industry
Law), so that the maximum field intensity moves across
the pole face on each cycle.
Because it has but a single alternating current source, a
single-phase motor can only produce an alternating
field: one that pulls first in one direction, then in the
opposite as the polarity of the field switches. A squirrel-
cage rotor placed in this field would merely twitch,
since there would be no moment upon it. If pushed in
one direction, however, it would spin.
The major distinction between the different types of
single-phase AC motors is how they go about starting
the rotor in a particular direction such that the
alternating field will produce rotary motion in the
desired direction. This is usually done by some device
that introduces a phase-shifted magnetic field on one
side of the rotor.
• Work in group to discuss about these
details as said below :
1. What will happen if a poly-phase induction motor is
disconnected one phase?
2. What will happen if a poly-phase induction motor is
connected to single phase supply.
3. What is shaded pole motor. Give the applications.
4. The types of single-phase AC motors are depended on
which feature?
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3. Ho Chi Minh University of Industry
5. Application of single phase motors.
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Reading passage 2:
Split-Phase Motors
The split phase motor achieves its starting capability by
having two separate windings wound in the stator. The
two windings are separated from each other. One
winding is used only for starting and it is wound with a
smaller wire size having higher electrical resistance than
the main windings. From the rotor's point of view, this
time delay coupled with the physical location of the
starting winding produces a field that appears to rotate.
The apparent rotation causes the motor to start. A
centrifugal switch is used to disconnect the starting
winding when the motor reaches approximately 75% of
rated speed. The motor then continues to run on the
basis of normal induction motor principles.
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4. Ho Chi Minh University of Industry
The phase of the magnetic field in this startup winding
is shifted from the phase of the mains power, allowing
the creation of a moving magnetic field which starts the
motor. Once the motor reaches near design operating
speed, the centrifugal switch activates, opening the
contacts and disconnecting the startup winding from the
power source. The motor then operates solely on the
running winding. The starting winding must be
disconnected since it would increase the losses in the
motor.
• Fill in the blanks by using information from
passage 2:
In the split phase motor, the startup winding is designed
with a higher ....................than the ....................
winding. This creates an LR circuit which slightly shifts
the phase of the current in the startup winding. When
the motor is starting, the startup winding is connected to
the power source via a set of spring-loaded contacts
pressed upon by the not-yet-rotating ..................... The
starting winding is wound with fewer turns of smaller
wire than the .................... winding, so it has a lower
inductance (L) and higher .................... (R). The lower
L/R ratio creates a small phase shift, not more than
about 30 degrees, between the flux due to the
.................... winding and the flux of the ....................
winding. The starting direction of rotation may be
.................... simply by exchanging the connections of
the startup winding relative to the running winding.
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5. Ho Chi Minh University of Industry
• Complete the diagram as shown below :
Reading passage 3:
Capacitor-Start Motors
Capacitor start motors form the largest single grouping
of general purpose single phase motors. These motors
are available in a range of sizes from fractional through
3HP. The winding and centrifugal switch arrangement is
very similar to that used in a split phase motor. The
main difference being that the starting winding does not
have to have high resistance. In the case of a capacitor
start motor, a specialized capacitor is utilized in a series
with the starting winding. The addition of this capacitor
produces a slight time delay between the magnetization
of starting poles and the running poles. Thus the
appearance of a rotating field exists. When the motor
approaches running speed, the starting switch opens and
Page 26
6. Ho Chi Minh University of Industry
the motor continues to run in the normal induction
motor mode.
This moderately priced motor produces relatively high
starting torque, 225 to 400% of full load torque. The
capacitor start motor is ideally suited for hard to start
loads such as conveyors, air compressors and
refrigeration compressors. Due to its general overall
desirable characteristics, it also is used for many
applications where high starting torque may not be
required. The capacitor start motor can usually be
recognized by the bulbous protrusion on the frame
where the starting capacitor is located.
• True/ False:
1. The winding and centrifugal switch arrangement is
very dissimilar to
that used in a split phase motor.
2. The starting winding of capacitor start motors does
not have to have
high resistance.
3. The capacitor is utilized in a series with the starting
winding.
4. A slight time delay between the magnetization of
starting poles
and the main poles.
Page 27
7. Ho Chi Minh University of Industry
5. When the motor approaches running speed, the
starting switch
opens and the motor discontinues to run in the
normal induction motor mode.
• Complete the diagram as shown below :
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8. Ho Chi Minh University of Industry
Reading passage 4:
Permanent-Split Capacitor Motors
Another variation is the Permanent Split-Capacitor
(PSC) motor. This motor operates similarly to the
capacitor-start motor described above, but there is no
centrifugal starting switch and the second winding is
permanently connected to the power source. By
changing taps on the running winding but keeping the
load constant, the motor can be made to run at different
speeds. The capacitor of this motor is left in series with
the starting winding during normal operation. The
starting torque is quite low, roughly 40% of full-load, so
PSC motors are frequently used in air handlers, fans,
and blowers and other cases where a variable speed is
desired.
• Complete the diagram as shown below :
Page 29
9. Ho Chi Minh University of Industry
Single-phase AC synchronous motors
The shaded pole motor is the
simplest of all single phase
starting methods. In the shaded
pole motor, the stator poles are
notched and a copper short
circuiting ring is installed around a
small section of the poles. As a
result of the alteration of the filed
pole configuration, the build-up of
the magnetic field is delayed in
the portion of the pole surrounded
by the copper shorting ring. From
the rotor's point of view,
this makes the magnetic field
seem to rotate from the main pole
toward the shaded pole. This
slight appearance of field rotation
is adequate to start the rotor
moving and, once started, it will
accelerate up to full speed. The
shaded pole motor is simple and
inexpensive, but has low
efficiency and a very low starting
torque.
Speed regulation is poor, and it must be fan-cooled
during normal operation. Shaded-pole motors are thus
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10. Ho Chi Minh University of Industry
used in shaft-mounted fans and blowers, and also small
pumps, toys, and intermittently used household items.
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11. Ho Chi Minh University of Industry
Grammar:
• Article : A / An
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• Prepositions: up, of, with, into....etc
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• Conjunctions:
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• Passive voice:
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12. Ho Chi Minh University of Industry
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• Comparision:
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