three leg inverter controlled induction motor for traction applications

7/31/2019 three leg inverter controlled induction motor for traction applications

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WELCOME


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Three Leg Inverter Controlled ThreePhase Induction Motor For Traction

Applications

BY :

P. VINAY KUMAR (06M21A0257)


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Abstract

In modern days the utilization of electric traction systems inlight load vehicles like cars has increased due to the energy

conservation and convenient of electric al energy.

In our project the a five leg inverter out of which three leg

inverter is used for induction motor Controlled and two leginverter is used for the compressor the effect of the three leg

inverter is the same.

In conventional petrol and diesel engines when compressormotor runs the torque of the engine reduces. But in an

electric drive are controlled above that the independent

operation of three leg.


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INTRODUCTION

Electric Vehicles In Recent years, growingConcerns about Environmental issues haveDemanded more Energy Efficient Nonpolluting

Vehicles.

In our project the a five leg inverter out of whichthree leg inverter is used for induction motor

Controlled and two leg Inverter is used for theCompressor the effect of the three leg Inverter is the

same.


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In Conventional petrol and diesel Engines when

compressor motor runs the Torque of the Engine

Reduces. But in an Electric drive are Controlled

above that the Independent Operation of three leg.

In our project we have analyzed an inverter which

can supply the fuel cell supply to the induction

motor to give out the required the speed and torque

as per the drive applications.

Five leg inverter and two leg inverter will not affect

the torque of induction motor which is controlled by

three leg inverter independently.


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Power Converters:

Power converter can be classified in to Four

types:

1. AC to DC Converter (Controlled Rectifier):

2. DC to DC Converter (DC Chopper):

3 AC to AC Converter (AC voltage Regulator)

4. DC to AC Converter (Inverter):


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1. AC to DC Converter (Controlled

Rectifier):

A Rectifier is an Electrical Device That Converts

Alternating Current (AC) to Direct Current (DC), a

Process Known as Rectification.

Rectifiers have Many uses Including as

Components of Power Supplies and as Detectors ofRadio Signals. Rectifiers may be made of Solid state

diodes, Vacuum tube diodes,Mercurey arc Valves ,

and other Components


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2. DC to DC Converter (DC Chopper)

The conversion of fixed DC voltage to an

Adjustable DC output voltage, through the useof semiconductor devices is called chopping.

A chopper is a static device that converts fixed

dc input voltage to a variable dc output voltage

directly


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3. AC to AC Converter (AC voltageRegulator):

A voltage Regulator is an Electrical Regulator

Designed to Automatically maintain a constant

voltage level. It may use an Electromechanical Mechanism, or

passive or active Electronic Components.

Depending on the design, it may be used to Regulateone or more AC or DC voltages.


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4.DC to AC Converter (Inverter):

Batteries produce power in Direct Current (DC)

Form, which can Run at Very low voltages but

cannot be used to run most modern householdappliances.

Utility Companies and Generators Produce Sine

wave alternating current (AC) power, which is usedby most commonly available appliances today.

Inverters take the DC power supplied by a storage

battery bank and electronically convert it to AC

ower.


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AC MotorsInduction motor:Components

Rotor

Squirrel cage:

conducting bars

in parallel slots

Wound rotor: 3-phase, double-layer,

distributed winding

Stator

Stampings with slots to carry 3-phase

windings

Wound for definite number of poles


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e

ctr

icMo

t

Electricity supplied to stator

Magnetic field generated that moves around

rotor Current induced in rotor

Electromagnetics

Stator

Rotor

Rotor produces second

magnetic field thatopposes stator

magnetic field

Rotor begins to rotate

How induction motors work:


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Advantages:

Simple design

Inexpensive

High power to weight ratio

Easy to maintain

Direct connection to AC power source

High Starting Torque


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CIRCUIT DISCRIPTION:


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1. POWER SUPPLY:

A Battery is a type of linear power supply that offers

Benefits that Traditional line-operated power

supplies lack mobility, Portability and Reliability.

A battery consists of multiple Electrochemical cells

connected to provide the desired voltage


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2. MOSFET:

The component that is used as the switchin the inverter unit is the MOSFET which isa voltage controlled device. They are thepower semi conductor devices that have afast switching property with a simple driverequirement

MOSFET Symbol


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3. INDUCTION MOTOR:

Induction Motor Convert Electrical Energy in to

Mechanical Energy

Electricity supplied to stator Magnetic field

generated that moves around rotor Current induced

in rotor Rotor produces second magnetic field thatopposes stator magnetic field Rotor begins to rotate


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CIRCUIT OPERATION:


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Gate Pulses:

ll S6 ll b d d


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Initially S6 will be in conduction mode.

S1 AND S6: Were S1 switch will conduct for0. During the conduction of S1, S6 will turnoffs at

S1 AND S2:At the time of conduction of S1,S2 will turn on at . After S1 will bein off position.

S2 AND S3:At the time of conduction of S2,S3 will turn on at . After S2 will be inoff position

S3 AND S4 A h i f d i f S3


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S3 AND S4:At the time of conduction of S3,S4 will turn on at . After S3 will be inoff position

S4 AND S5: At the time of conduction of S4,S5 will turn on at . After S4 will be inoff position

S5 AND S6: At the time of conduction of S5,S6 will turn on at After S5 will be inoff position.This cycle will repeats


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CIRCUIT ANALYSIS:


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Three Leg Inverter Voltage Wave forms:


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Induction Motor Out Put Speed Wave

Forms:


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Induction Motor Out Put Torque:


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CONCLUSION:

A soft-switched isolated three leg inverter has beenImplemented in this project.

The operation, Analysis, features and design considerationwere illustrated. Simulation and Experimental results Are

Shown

As well as control the induction motor and accessory power

needs, make the proposed three inverter very promising for

medium power applications with high power density.


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FUTURESCOPE:

Three leg inverter is also applicable for space vector

modulation

A single control circuit typically based on a

microprocessor or hardware such as A/D converters,PWM counters and encoder interface circuitry, can be

used to execute control the motors. With a proper

control, the motors can be run in either motoring

mode or generating mode.


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Regenerative breaking

Automotive engineers have given this problem

of regenerative breaking a lot of thought andhave come up with a kind of braking systemthat can recapture much of the car's kineticenergy and convert it into electricity, so that it

can be used to recharge the car's batteries. Thissystem is called regenerative braking.


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ANY QUERIES ?


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three leg inverter controlled induction motor for traction applications

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