Second Lesson Induction Motor
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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.
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Induction motor three phase
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.
Presentation induction motors 2
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.
Induction motor 3ph
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.
3 ph induction motor ppt
This document outlines and describes the key components and operating principles of three-phase induction motors, which are widely used in industrial applications due to their continuous operation. It discusses the main types of electrical machines and induction motors, including squirrel cage and slip ring induction motors. The document explains the basic working principle of three-phase induction motors, involving the generation of a rotating magnetic field in the stator that induces current in the rotor. It also describes the main components of three-phase induction motors such as the frame, stator, rotor, and windings.
Induction motors
The document provides information about three-phase and single-phase induction motors:
- It describes the basic construction and operation of three-phase induction motors, including details on the stator, rotor, windings, and star and delta connections.
- Methods of calculating synchronous motor speed based on supply frequency and number of poles are shown.
- Single-phase induction motors are also discussed, along with starting methods for both three-phase and single-phase motors.
- Testing procedures for motor windings and reversing motor direction are outlined.
3phase induction motor(sukhpreet)
This presentation provides an overview of induction motors, including:
1. It discusses the history and invention of induction motors by Tesla and Dobrovolsky.
2. It explains the principle of operation of induction motors, how they generate torque via electromagnetic induction without direct electrical connection to the rotor.
3. It covers the construction of common induction motors, including squirrel cage and slip ring rotors, and describes speed control techniques like PWM.
Presentation on induction motor
This presentation provides an overview of induction motors. It begins by defining an electric motor as a device that converts electrical energy to mechanical energy. It then classifies motors as either alternating current (AC) or direct current (DC). The presentation focuses on AC induction motors, which are the most common type used in industry due to their simple design, low cost, and ease of maintenance. It describes the basic components and operation of an induction motor, including its stator, rotor, and how rotational motion is produced through electromagnetic induction. It also discusses two common rotor types - squirrel cage and wound rotor - and defines the concept of slip in induction motors.
Dc & ac motors
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.
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Induction motor three phase
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.
Presentation induction motors 2
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.
Induction motor 3ph
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.
3 ph induction motor ppt
This document outlines and describes the key components and operating principles of three-phase induction motors, which are widely used in industrial applications due to their continuous operation. It discusses the main types of electrical machines and induction motors, including squirrel cage and slip ring induction motors. The document explains the basic working principle of three-phase induction motors, involving the generation of a rotating magnetic field in the stator that induces current in the rotor. It also describes the main components of three-phase induction motors such as the frame, stator, rotor, and windings.
Induction motors
The document provides information about three-phase and single-phase induction motors:
- It describes the basic construction and operation of three-phase induction motors, including details on the stator, rotor, windings, and star and delta connections.
- Methods of calculating synchronous motor speed based on supply frequency and number of poles are shown.
- Single-phase induction motors are also discussed, along with starting methods for both three-phase and single-phase motors.
- Testing procedures for motor windings and reversing motor direction are outlined.
3phase induction motor(sukhpreet)
This presentation provides an overview of induction motors, including:
1. It discusses the history and invention of induction motors by Tesla and Dobrovolsky.
2. It explains the principle of operation of induction motors, how they generate torque via electromagnetic induction without direct electrical connection to the rotor.
3. It covers the construction of common induction motors, including squirrel cage and slip ring rotors, and describes speed control techniques like PWM.
Presentation on induction motor
This presentation provides an overview of induction motors. It begins by defining an electric motor as a device that converts electrical energy to mechanical energy. It then classifies motors as either alternating current (AC) or direct current (DC). The presentation focuses on AC induction motors, which are the most common type used in industry due to their simple design, low cost, and ease of maintenance. It describes the basic components and operation of an induction motor, including its stator, rotor, and how rotational motion is produced through electromagnetic induction. It also discusses two common rotor types - squirrel cage and wound rotor - and defines the concept of slip in induction motors.
Dc & ac motors
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.
induction motor
The document summarizes the key components and operating principles of an induction motor. It has two main parts: the stator and the rotor. The stator, the stationary part, contains windings that generate a rotating magnetic field. The rotor, the rotating part, is induced to turn by electromagnetic induction from the stator field. There are two main types of rotors: squirrel cage and wound slip ring. The induction motor works by the rotor conductors generating currents from the rotating stator field, causing the rotor to turn at a slightly lower synchronous speed due to slippage.
polyphase induction motor
The document summarizes the key aspects of polyphase induction motors, including:
1) Nikola Tesla conceived the induction motor in 1883 and sold the rights to George Westinghouse. Most large industrial motors are polyphase induction motors with multiple stator windings driven by time-shifted sine waves, usually two or three phases.
2) An induction motor has a rotor and stator, with the stator windings connected to a polyphase power source. The rotating magnetic field produced by the stator induces current in the rotor, causing it to turn.
3) The induction motor is simple and reliable compared to DC motors as the rotor has no commutator or brushes. Torque is
3phase induction motor
The document provides an overview of induction motors, including:
1. It describes the basic operating principle of induction motors, which induce a current in the rotor via electromagnetic induction from a rotating magnetic field in the stator.
2. It discusses different types of induction motors including single phase, three phase, squirrel cage, and slip ring rotors.
3. It provides some key formulas for induction motors relating supply frequency, pole pairs, synchronous speed, rotor speed, and slip.
Induction motor
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.
Unit 2 single phase induction motor
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
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This document provides information on various types of single-phase induction motors. It discusses the construction and working of split-phase induction motors, capacitor start induction motors, permanent capacitor motors, shaded-pole motors, universal motors, and repulsion motors. The key points covered are:
- Single-phase induction motors require special mechanisms to produce a rotating magnetic field and make them self-starting.
- Common self-starting methods include using an auxiliary starting winding, a capacitor, or shading coils.
- Split-phase motors use a starting winding to produce a phase difference between currents. Capacitor motors add a capacitor to further improve starting torque.
- Shaded-pole motors produce a rotating
Ac motor
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.
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Electrical machine Day 11, Construction of DC, Induction motor, Synchronous generator, Synchronous motor, alternator, Basic Electrical Engineering
Syllabus
Introduction of Machine
Classification of Machine
Construction of DC, Induction & Synchronous machine
Working Principle
EMF Equation of all machine
A transformer works on alternating current, while a DC machine works on Direct Current
It has two main parts :
Stator – It is the stationary part. It does not move or rotate.
Rotor – It is the rotating part of the machine.
Electrical machine Day 11,Construction of DC, Induction motor, Synchronous generator, Synchronous motor,alternator,Basic Electrical Engineering
Syllabus
Introduction of Machine
Classification of Machine
Construction of DC, Induction & Synchronous machine
Working Principle
EMF Equation of all machine
A transformer works on alternating current, while a DC machine works on Direct Current
It has two main parts :
Stator – It is the stationary part. It does not move or rotate.
Rotor – It is the rotating part of the machine.
YOKE
It is the outermost part of a DC motor. It is made of cast iron or cast steel.
It provides mechanical protection to the inner parts of the machine.
Provide low reluctance path for the magnetic flux.
Pole core
These are made of cast steel laminations.
The main purpose is to hold the field windings .
The end portion of the pole is called pole shoe.
FIELD WINDING
They are enameled copper wires wound around the poles
When current passes through series connected windings then adjacent poles attain opposite polarity
Armature core
This is the rotating part of the machine
It is a cylindrical structure with slots around its outer periphery.
It houses conductors in the slots.
It provides easy path for magnetic flux
AC Motors-Asynchronous
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.
Induction motor
This presentation summarizes an induction motor. It discusses that an induction motor works on the principle of transformer action, with the stator acting as the primary and the rotor acting as the secondary. The presentation describes the main components of the stator including the outer frame, core, and three-phase winding. It also discusses the two main types of rotors: squirrel cage and wound rotor. The operation of the induction motor is explained, noting that a rotating magnetic field in the stator induces current in the rotor to generate torque. Slip is defined as the difference between synchronous and actual rotor speeds.
Induction motor
The induction motor operates on the principle of electromagnetic induction. It consists of two main parts - the stator and the rotor. The stator contains windings that generate a rotating magnetic field, acting as the primary. This rotating field induces currents in the rotor windings, which acts as the secondary. The rotor is then pushed to rotate at a slightly lower speed than the rotating field due to "slip."
How does a 3-phase motor works
Explains, in detail, how a 3-Phase motor works. The ppt explains through diagrams, the basic functioning of a 3-phase motor operations.
Aj induction
3-phase induction motors are widely used in industrial applications due to their rugged, low maintenance construction. They operate by creating a rotating magnetic field in the stationary stator windings using 3-phase power which induces a current in the short-circuited rotor windings, causing the rotor to turn. Squirrel cage induction motors are most common due to their low cost but slip ring motors provide higher starting torque. Both have a torque-slip characteristic where torque decreases with speed until the rotor reaches synchronous speed. Common applications include pumps, fans and other loads requiring continuous operation.
Induction machine
Induction machines operate on the principle of electromagnetic induction. There are two main types of induction motor rotors: squirrel cage and slipring. The squirrel cage rotor is more common and consists of bars shorted together at the ends. The slipring rotor uses an external resistance that can be adjusted. Induction motors operate slightly slower than synchronous speed due to slip. Slip affects rotor parameters like frequency, voltage, reactance, current and power factor. Torque in an induction motor depends on flux, rotor current, and rotor power factor.
Induction Motor
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.
Three phase Induction Motor (Construction and working Principle)
The three phase induction motor consists of a stationary stator and a rotating rotor. The stator contains three-phase windings that generate a rotating magnetic field. This rotating field induces currents in the rotor windings, causing the rotor to turn. There are two common types of rotors - squirrel cage and wound rotor. A squirrel cage rotor has embedded conductors inside its core that are permanently short-circuited. A wound rotor has three insulated windings connected to slip rings to allow external resistance control. Due to slight differences in speed, the rotor always rotates at a slightly slower synchronous speed than the stator's magnetic field.
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
Pbl 1
The document discusses the asynchronous or induction motor, specifically focusing on its construction and working principles. It describes the main components of an asynchronous motor including the stator and rotor, and explains how different types of rotors like squirrel cage and slip ring function through electromagnetic induction to generate torque without a direct electrical connection. The working principle is demonstrated through diagrams showing how a rotating magnetic field is produced in the stator to induce currents in the rotor and make it rotate at a slightly lower synchronous speed.
Ac motors
An AC motor has a stationary stator with coils that produce a rotating magnetic field. The inner rotor is given torque by this field. There are two main types - induction motors which rely on induction to induce rotor currents, and synchronous motors which rotate at the exact supply frequency. Squirrel cage rotors consist of embedded conductors in steel and are widely used. Three-phase induction motors are economical and rugged for industrial drives. They work by the rotating stator field inducing currents in the rotor to generate torque and rotate it slightly slower than the field.
Induction motor
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.
Corrected1
This document presents 10 electrical and electronics laboratory circuits explored and researched by Mohammed Imran, Assistant Professor of Electrical and Electronics Engineering, along with contributions from 4 mechanical engineering students. The circuits include brake tests on different types of DC motors, speed control of a DC shunt motor, load testing of a 3-phase induction motor, open and short circuit tests on a transformer, power measurement using the two-wattmeter method, and experiments exploring Thevenin's and Norton's theorems. Diagrams and brief descriptions are provided for each circuit.
Induction machines
Here are the key steps to solve this problem:
1. Given: Vs = 460 V, Ps = 25 hp, fs = 60 Hz, P = 4, R1 = 0.641 Ω, R2 = 0.332 Ω, X1 = 1.106 Ω, X2 = 0.464 Ω, XM = 26.3 Ω, Pr = 1100 W
2. Calculate synchronous speed: ns = 120fs/P = 120*60/4 = 1800 rpm
3. Assume load torque and calculate slip: s = Torque/Tmax = ?
4. Calculate rotor current and power at the assumed slip using equivalent circuit equations.
5.
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induction motor
The document summarizes the key components and operating principles of an induction motor. It has two main parts: the stator and the rotor. The stator, the stationary part, contains windings that generate a rotating magnetic field. The rotor, the rotating part, is induced to turn by electromagnetic induction from the stator field. There are two main types of rotors: squirrel cage and wound slip ring. The induction motor works by the rotor conductors generating currents from the rotating stator field, causing the rotor to turn at a slightly lower synchronous speed due to slippage.
polyphase induction motor
The document summarizes the key aspects of polyphase induction motors, including:
1) Nikola Tesla conceived the induction motor in 1883 and sold the rights to George Westinghouse. Most large industrial motors are polyphase induction motors with multiple stator windings driven by time-shifted sine waves, usually two or three phases.
2) An induction motor has a rotor and stator, with the stator windings connected to a polyphase power source. The rotating magnetic field produced by the stator induces current in the rotor, causing it to turn.
3) The induction motor is simple and reliable compared to DC motors as the rotor has no commutator or brushes. Torque is
3phase induction motor
The document provides an overview of induction motors, including:
1. It describes the basic operating principle of induction motors, which induce a current in the rotor via electromagnetic induction from a rotating magnetic field in the stator.
2. It discusses different types of induction motors including single phase, three phase, squirrel cage, and slip ring rotors.
3. It provides some key formulas for induction motors relating supply frequency, pole pairs, synchronous speed, rotor speed, and slip.
Induction motor
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.
Unit 2 single phase induction motor
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
1phase induction motors
This document provides information on various types of single-phase induction motors. It discusses the construction and working of split-phase induction motors, capacitor start induction motors, permanent capacitor motors, shaded-pole motors, universal motors, and repulsion motors. The key points covered are:
- Single-phase induction motors require special mechanisms to produce a rotating magnetic field and make them self-starting.
- Common self-starting methods include using an auxiliary starting winding, a capacitor, or shading coils.
- Split-phase motors use a starting winding to produce a phase difference between currents. Capacitor motors add a capacitor to further improve starting torque.
- Shaded-pole motors produce a rotating
Ac motor
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.
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#SYNCHRONOUS MACHINE CONSTRUCTION IN HINDI
#CONSTRUCTION OF INDUCTION MACHINE
#CONSTRUCTION OF SYNCHRONOUS MACHINE
#CONSTRUCTION OF DC MOTOR
#CONSTRUCTION OF DC GENERATOR
#CONSTRUCTION OF INDUCTION MOTOR
#BASIC ELECTRICAL ENGINEERING
Electrical machine Day 11, Construction of DC, Induction motor, Synchronous generator, Synchronous motor, alternator, Basic Electrical Engineering
Syllabus
Introduction of Machine
Classification of Machine
Construction of DC, Induction & Synchronous machine
Working Principle
EMF Equation of all machine
A transformer works on alternating current, while a DC machine works on Direct Current
It has two main parts :
Stator – It is the stationary part. It does not move or rotate.
Rotor – It is the rotating part of the machine.
Electrical machine Day 11,Construction of DC, Induction motor, Synchronous generator, Synchronous motor,alternator,Basic Electrical Engineering
Syllabus
Introduction of Machine
Classification of Machine
Construction of DC, Induction & Synchronous machine
Working Principle
EMF Equation of all machine
A transformer works on alternating current, while a DC machine works on Direct Current
It has two main parts :
Stator – It is the stationary part. It does not move or rotate.
Rotor – It is the rotating part of the machine.
YOKE
It is the outermost part of a DC motor. It is made of cast iron or cast steel.
It provides mechanical protection to the inner parts of the machine.
Provide low reluctance path for the magnetic flux.
Pole core
These are made of cast steel laminations.
The main purpose is to hold the field windings .
The end portion of the pole is called pole shoe.
FIELD WINDING
They are enameled copper wires wound around the poles
When current passes through series connected windings then adjacent poles attain opposite polarity
Armature core
This is the rotating part of the machine
It is a cylindrical structure with slots around its outer periphery.
It houses conductors in the slots.
It provides easy path for magnetic flux
AC Motors-Asynchronous
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.
Induction motor
This presentation summarizes an induction motor. It discusses that an induction motor works on the principle of transformer action, with the stator acting as the primary and the rotor acting as the secondary. The presentation describes the main components of the stator including the outer frame, core, and three-phase winding. It also discusses the two main types of rotors: squirrel cage and wound rotor. The operation of the induction motor is explained, noting that a rotating magnetic field in the stator induces current in the rotor to generate torque. Slip is defined as the difference between synchronous and actual rotor speeds.
Induction motor
The induction motor operates on the principle of electromagnetic induction. It consists of two main parts - the stator and the rotor. The stator contains windings that generate a rotating magnetic field, acting as the primary. This rotating field induces currents in the rotor windings, which acts as the secondary. The rotor is then pushed to rotate at a slightly lower speed than the rotating field due to "slip."
How does a 3-phase motor works
Explains, in detail, how a 3-Phase motor works. The ppt explains through diagrams, the basic functioning of a 3-phase motor operations.
Aj induction
3-phase induction motors are widely used in industrial applications due to their rugged, low maintenance construction. They operate by creating a rotating magnetic field in the stationary stator windings using 3-phase power which induces a current in the short-circuited rotor windings, causing the rotor to turn. Squirrel cage induction motors are most common due to their low cost but slip ring motors provide higher starting torque. Both have a torque-slip characteristic where torque decreases with speed until the rotor reaches synchronous speed. Common applications include pumps, fans and other loads requiring continuous operation.
Induction machine
Induction machines operate on the principle of electromagnetic induction. There are two main types of induction motor rotors: squirrel cage and slipring. The squirrel cage rotor is more common and consists of bars shorted together at the ends. The slipring rotor uses an external resistance that can be adjusted. Induction motors operate slightly slower than synchronous speed due to slip. Slip affects rotor parameters like frequency, voltage, reactance, current and power factor. Torque in an induction motor depends on flux, rotor current, and rotor power factor.
Induction Motor
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.
Three phase Induction Motor (Construction and working Principle)
The three phase induction motor consists of a stationary stator and a rotating rotor. The stator contains three-phase windings that generate a rotating magnetic field. This rotating field induces currents in the rotor windings, causing the rotor to turn. There are two common types of rotors - squirrel cage and wound rotor. A squirrel cage rotor has embedded conductors inside its core that are permanently short-circuited. A wound rotor has three insulated windings connected to slip rings to allow external resistance control. Due to slight differences in speed, the rotor always rotates at a slightly slower synchronous speed than the stator's magnetic field.
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
Pbl 1
The document discusses the asynchronous or induction motor, specifically focusing on its construction and working principles. It describes the main components of an asynchronous motor including the stator and rotor, and explains how different types of rotors like squirrel cage and slip ring function through electromagnetic induction to generate torque without a direct electrical connection. The working principle is demonstrated through diagrams showing how a rotating magnetic field is produced in the stator to induce currents in the rotor and make it rotate at a slightly lower synchronous speed.
Ac motors
An AC motor has a stationary stator with coils that produce a rotating magnetic field. The inner rotor is given torque by this field. There are two main types - induction motors which rely on induction to induce rotor currents, and synchronous motors which rotate at the exact supply frequency. Squirrel cage rotors consist of embedded conductors in steel and are widely used. Three-phase induction motors are economical and rugged for industrial drives. They work by the rotating stator field inducing currents in the rotor to generate torque and rotate it slightly slower than the field.
Induction motor
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.
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This document presents 10 electrical and electronics laboratory circuits explored and researched by Mohammed Imran, Assistant Professor of Electrical and Electronics Engineering, along with contributions from 4 mechanical engineering students. The circuits include brake tests on different types of DC motors, speed control of a DC shunt motor, load testing of a 3-phase induction motor, open and short circuit tests on a transformer, power measurement using the two-wattmeter method, and experiments exploring Thevenin's and Norton's theorems. Diagrams and brief descriptions are provided for each circuit.
Induction machines
Here are the key steps to solve this problem:
1. Given: Vs = 460 V, Ps = 25 hp, fs = 60 Hz, P = 4, R1 = 0.641 Ω, R2 = 0.332 Ω, X1 = 1.106 Ω, X2 = 0.464 Ω, XM = 26.3 Ω, Pr = 1100 W
2. Calculate synchronous speed: ns = 120fs/P = 120*60/4 = 1800 rpm
3. Assume load torque and calculate slip: s = Torque/Tmax = ?
4. Calculate rotor current and power at the assumed slip using equivalent circuit equations.
5.
Chapter 3 induction machine
The document describes the construction and operating principles of induction motors. It discusses:
- The key components of induction motors including the stator, rotor, and rotating magnetic field generated by the stator windings.
- The two main types of rotors: squirrel cage and wound rotor. Squirrel cage rotors are simpler and more rugged while wound rotors can be used to adjust torque-speed characteristics.
- Concepts like synchronous speed, slip, and rotor frequency. Slip is defined as the difference between synchronous and actual rotor speed.
- The per-phase equivalent circuit model of induction motors and how it is used to analyze power flow and calculate performance parameters like torque.
Fourth Lesson Im
The document describes how to perform a blocked rotor test on a 3-phase induction motor. The test is similar to a short circuit test on a transformer. It determines the motor's load dependent losses, stator and rotor reactances, and rotor resistance. To do the test, the rotor is blocked from rotating while voltage is applied to the stator terminals and gradually increased until rated current is reached. Current, voltage, and power measurements are then used to calculate the motor parameters.
First Lesson Induction Motor1
The document discusses Lenz's law and Faraday's law of induction. It explains that according to Lenz's law, any change in magnetic flux induces an electromotive force (emf) in a wire that creates a current which opposes the change in flux. Faraday's law states that a changing magnetic field around a coil of wire induces a voltage in the coil. The document then discusses how induction motors work by using induced currents in shorted wire loops on a rotating armature to generate torque from a changing magnetic field in the stator coils.
Electrical introduction
This document introduces AC machines and provides details about their classification and operation. It discusses synchronous generators and motors, as well as induction motors and generators. The key points covered are:
- AC machines are classified as synchronous or induction based on their operation. Synchronous machines include generators and motors while induction machines include motors and rarely generators.
- Generators convert mechanical energy to electrical energy, while motors convert electrical to mechanical. Their construction is similar but operation is reversed.
- Windings in AC machines can be concentrated or distributed. Distributed windings are used in induction machines' stators and rotors as well as in synchronous machine armatures.
- Double layer windings are more common than single layer above
Third Lesson Induction Motor
The document discusses performing a no-load test on a three-phase induction motor. A no-load test is done to determine the motor's no-load losses, which include iron losses from the core and mechanical losses. The test involves applying balanced three-phase voltages to the stator at rated frequency while the rotor is uncoupled from any load. Various motor parameters like speed, current, voltage and power are measured at different voltages to calculate losses.
Deep bar n double cage rotors
The document presents information on deep bar and double cage rotors for induction motors. Deep bar rotors have bars made of multiple parallel layers to provide high starting torque through unequal current distribution across layers while maintaining efficiency at normal speeds. Double cage rotors contain an outer cage of high resistance material and an inner cage of low resistance material to generate high starting torque from the outer cage and torque at normal speeds from the inner cage. Such rotors allow induction motors to meet the needs of high starting torque applications.
Rotating magnetic field
Rotating magnetic fields are produced by supplying a three-phase winding with alternating current such that the current in each phase is 120 degrees out of phase. This produces three magnetic fluxes that are 120 degrees out of phase. The vector sum of these three fluxes results in a single magnetic flux vector that rotates in space. This rotating magnetic field can be used to drive an electric motor or generator. The speed of rotation is proportional to the supply frequency and number of poles, such that for a 2-pole winding, the magnetic field rotates at half the frequency of the alternating current supply.
Three phase induction motor By Mitesh Kumar
This document presents on three phase induction motors. It discusses the basic construction of an induction motor including the stationary stator and revolving rotor. It describes the two main rotor designs - squirrel cage and wound rotor. It explains the principle of operation where the rotating magnetic field produced in the stator induces currents in the rotor windings, generating torque. It provides the formula to calculate synchronous speed based on supply frequency and number of poles. Finally, it discusses applications of squirrel cage and wound rotor induction motors.
Dc motor
A DC motor works by converting DC power into mechanical energy using the principle that a current-carrying conductor placed in a magnetic field experiences a mechanical force. It has a field system including field windings that generate a magnetic field, an armature with windings on a core, and a commutator that redirects current flow to keep the torque moving the motor. The speed of a DC motor can be controlled by changing the current through the field windings to adjust the magnetic flux or by changing the armature resistance to vary the voltage applied to the armature. Common DC motor types include shunt, series, and compound motors used in various applications like fans, pumps, machine tools, locomotives, and industrial equipment.
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Marketing industrial products in rural areas l&t
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INDUCTION MOTOR1
The document discusses three-phase induction motors. It describes the construction of an induction motor, including its main parts - the stator and rotor. The stator contains three-phase windings, while the rotor can be either a squirrel-cage type or a wound type. Some advantages of three-phase induction motors are also listed, such as their simplicity, ruggedness, low cost, high efficiency, and suitability for a variety of environments.
Induction motors
This document provides information about induction motors. It describes the basic construction of an induction motor, including its stator and squirrel cage or wound rotor. It explains how a rotating magnetic field is produced from the three-phase stator windings and how this induces a voltage and current in the rotor. It defines key terms like synchronous speed and slip. It also presents the equivalent circuit model of an induction motor and discusses speed control methods and power losses in induction machines.
Induction Motors
Induction motors work by using a rotating magnetic field in the stator to induce currents in the rotor. This produces a torque on the rotor causing it to rotate slightly slower than the synchronous speed of the magnetic field. The induction motor has no direct electrical connection between the stator and rotor; instead, current is induced in the rotor by electromagnetic induction from the stator's magnetic field. This self-starting property makes induction motors well-suited for many applications.
Alternating Current Machines 1a
This document provides an overview of an 80-hour module on alternating current machines, including three-phase motors, single-phase motors, and synchronous machines. The module is divided into three sections covering three-phase motor theory, single-phase motors, and synchronous machines including alternators. It emphasizes that all practical work must be satisfactorily completed with short reports. Learning outcomes cover topics like motor principles, protection, connections, wiring rules, single-phase motor parts and operation, synchronous motors, and motor faults.
Ac motors and their 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.
20620041 electrical-motors
Electric motors are electromechanical devices that convert electrical energy into mechanical energy. The document discusses types of electric motors including direct current (DC) motors and alternating current (AC) motors. It also discusses assessing motor efficiency and energy efficiency opportunities for electric motors such as using energy efficient motors, reducing underloading, improving power quality, and power factor correction.
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This document provides information on three-phase induction motors:
- It discusses the construction, operation, and advantages/disadvantages of three-phase induction motors. The main components are the stationary stator and revolving rotor, which can be either a squirrel cage or wound type.
- A balanced three-phase supply to the stator produces a rotating magnetic field that induces voltage in the rotor windings, generating torque. The motor runs slightly slower than the synchronous speed due to slip.
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The document provides details about the syllabus for the course 19E404 - Induction and Synchronous Machine. It discusses the key topics that will be covered including three phase induction motors, their construction, working principle, performance and control. It also discusses single phase induction motors and synchronous generators and motors, their construction and operating principles.
3phase induction motor
The document provides an overview of induction motors, including:
1. It describes the basic operating principle of induction motors, which induce a current in the rotor via electromagnetic induction from a rotating magnetic field in the stator.
2. It discusses different types of induction motors including single phase, three phase, squirrel cage, and slip ring rotors. Speed control methods like PWM are also covered.
3. Formulas relating supply frequency, pole pairs, synchronous speed, slip, and rotor speed are presented.
3phase induction motor
The document provides an overview of induction motors, including:
1. It describes the basic operating principle of induction motors, which induce a current in the rotor via electromagnetic induction from a rotating magnetic field in the stator, rather than supplying current directly to the rotor like a synchronous motor.
2. It discusses the different types of induction motors, including single phase, three phase, squirrel cage, and slip ring rotor designs.
3. It provides some key formulas for relating supply frequency, pole pairs, synchronous speed, slip speed, and rotor speed in induction motors.
CH-2_3 Induction Machines.ppt
THIS PPT GIVES A GOOD REVIEW POINT ON INDUCTION MACHINES AND HOW THEY WORK INCLUDING THEIR CHARACTERISTICS.
Induction Machines like induction motor, ganerator.ppt
this ppt is on the different types of induction motor
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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.
Induction Machines.ppt
This document discusses three-phase induction motors. It describes their common use in industry due to their simple and rugged design. It explains that induction motors run at a constant speed from no-load to full-load. Variable speed control requires an adjustable frequency power supply. The motor has a stationary stator and a revolving rotor, which can have either wound or squirrel cage windings. A rotating magnetic field from the stator induces currents in the rotor to generate torque. Induction motors always run slightly slower than synchronous speed due to slip.
Induction Machines electrical machines electrical and electronics
This document summarizes the construction and operating principles of three-phase induction motors. It describes the main components of the stator and rotor, including squirrel cage and wound rotor designs. It explains how a rotating magnetic field is produced in the stator to induce voltage in the rotor windings. The motor runs at a speed slightly below synchronous speed due to slip. An equivalent circuit model is presented to analyze the motor. Power losses in different components are identified and power flow equations are provided.
Induction Machine electrical and electronics
This document provides an overview of three-phase induction motors, including their construction, operation, and characteristics. It discusses the main components of induction motors, including the stator, squirrel cage rotor, and wound rotor. It explains how a rotating magnetic field is produced in the stator to induce voltage and current in the rotor. It also covers key concepts such as synchronous speed, slip speed, rotor frequency, torque production, and equivalent circuits. Power losses and relationships between input, output, and loss powers are also summarized.
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This document provides an overview of an undergraduate course on electrical machines at Aksum University. It discusses different types of electric motors including AC motors, synchronous motors, induction motors, and their construction and working principles. AC motors operate using alternating current to induce a current in the rotor. Synchronous motors are used as generators to supply electric power. Induction motors have a stationary stator and rotating rotor, and work based on electromagnetic induction. The document explains the induction motor components like the squirrel cage and wound rotors, and provides their construction details and differences. It also covers the working principle of induction motors involving rotating magnetic fields and torque production.
Induction Machines.ppt
Three-phase induction motors are commonly used in industry due to their simple and rugged design. They have a wide power rating range and can run at nearly constant speed from no load to full load. An induction motor contains a stationary stator and a revolving rotor. The stator produces a rotating magnetic field which induces a voltage in the rotor windings, generating a torque. Induction motors always run slightly slower than synchronous speed due to slip. They are efficient machines but require a variable frequency drive for variable speed control.
Chapter#34
The document discusses induction motors and their operation. It begins by explaining that induction motors operate using induction rather than direct conduction of power to the rotor like in DC motors. The rotor receives power through induction in the same way as a transformer secondary from the primary. Induction motors can thus be viewed as rotary transformers. The rotor is then induced to spin by the revolving magnetic field produced by the three-phase stator winding when powered. Two main types of rotors are described: squirrel cage, which is the simplest design; and wound rotor, which allows adding external resistance to control torque.
Induction machines
An induction motor is described with the following specifications:
- 480-V, 60 Hz, 50-hp, 3-phase
- Drawing 60A at 0.85 PF lagging
- Stator copper losses of 2 kW
- Rotor copper losses of 700 W
To determine the rotor frequency at full load, the slip is calculated using the given power rating, current, and power factor. The slip is then used to calculate the rotor frequency.
Speed control by kramer method (Karan)
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.
sim.pptx
The document discusses three-phase induction motors, including their construction, operation, and characteristics. It describes:
1) The main components of three-phase induction motors are the stator, which contains three-phase windings, and the rotor, which is either a squirrel cage or wound type. The rotating magnetic field in the stator induces currents in the rotor that generate torque.
2) Induction motors operate at a speed slightly below synchronous speed, with the difference called slip. Torque output is proportional to slip at low slip values and decreases with increasing slip above a maximum point.
3) Key motor characteristics like starting torque, maximum torque, equivalent circuits, and torque-slip curves are explained
Chapter 3
The document discusses three-phase induction motors. It covers the motor's construction, basic concepts, equivalent circuit model, power and torque characteristics, and speed control. The key learning objectives are understanding the motor's construction, slip concept, equivalent circuit model, torque-speed curve variations, and speed control techniques. The motor has a stationary stator and a rotating squirrel cage or wound rotor. Voltage induced in the rotor from the rotating stator magnetic field causes current flow and torque production. The motor runs at sub-synchronous speed due to slip between the rotor and field speeds.
Three Phase Induction Motor.pptx
This document provides an overview of the three phase induction motor, including its components, construction, working principle, and applications. It describes that a three phase induction motor consists of a stationary stator and a rotating rotor. The stator contains three phase windings that generate a rotating magnetic field when powered by a three phase voltage supply. This rotating magnetic field induces currents in the rotor windings, causing the rotor to rotate at a slightly lower synchronous speed. Three phase induction motors are commonly used to drive industrial loads due to their simple and robust construction, high efficiency, and low maintenance requirements.
Induction machines
Three-phase induction motors are commonly used in industry due to their simple and rugged design. They run at a constant speed below synchronous speed due to the slip between the rotating magnetic field and the rotor. An induction motor contains a stationary stator and a revolving rotor. The stator produces a rotating magnetic field which induces a voltage and current in the rotor windings, generating torque. Torque and power equations are developed using the motor's equivalent circuit model, which relates the motor's electrical inputs and outputs.
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Second Lesson Induction Motor
- 1. CLIL experience Content and Language Integrated Learning 2 nd Second lesson
- 3. Cutaway of a three-phase induction motor
- 4. Three-phase induction motor Squirrel cage rotor Stator windings The stator consists of wound 'poles' that carry the supply current to induce a magnetic field that penetrates the rotor. In a very simple motor, there would be a single projecting piece of the stator (a salient pole ) for each pole, with windings around it; in fact, to optimize the distribution of the magnetic field, the windings are distributed in many slots located around the stator, but the magnetic field still has the same number of north-south alternations. The number of 'poles' can vary between motor types but the poles are always in pairs (i.e. 2, 4, 6, etc.).
- 7. Construction squirrel cage rotor The most common rotor is a squirrel-cage rotor. It is made up of bars of either solid copper (most common) or aluminum that span the length of the rotor, and are connected through a ring at each end.
- 8. Construction stator & rotor
- 10. How does it work? The relationship between the supply frequency, f , the number of poles, p , and the synchronous speed (speed of rotating field), ns is: where n = Revolutions per minute (rpm) f = AC power frequency (hertz) p = Number of poles per phase (an even number)
- 11. Rotating Magnetic Field Look at magnetic field component. Blu, yellow and red vector rappresente the fields generated by trhee windings. Black vector is rotating field as result in every moment.
- 18. Complete the power flow diagram