EE2403 Special Electrical Machines Scanned Lecture Notes - Thangasamy Edition

[Srini]

   

Anna University , Chennai

Department of B.E-Electrical and Electronics Engg

Seventh Semester

EE2403 Special Electrical Machines 

(Regulation 2008) 

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Syllabus :

UNIT-1 : Synchronous reluctance motor

UNIT-2 : STEPPING MOTOR

UNIT-3 : SWITCHED RELUCTANCE MOTORS

UNIT-4 : PERMANENT MAGNET BRUSHLESS DC motor

UNIt-5 : Permanent magnet synchronous motor

Content :
SPECIAL ELECTRICAL MACHINE
UNIT-1
Synchronous reluctance motor
Need for syn reluctance motor
Operating principle
Reluctance torque
Reason for rotation of rotor
Design of motor
1. Stator
2. Rotor
Classification of synchronous reluctance motor
1. Rotor configuration
a. Cage rotor for line start
b. Cageless rotor for variable speed
2. Stator windings
3. Stator current controlled mode
Stator current mode
1. Unipolar current mode
2. Bipolar current mode
Axial airgap motor
Radial airgap motor
Radically laminated rotor
Characteristics of syn reluctance motor
Advantages
Disadvantages
Application
Vernier motor
Main features
Construction
Typical configuration for stator
1. Split – pole type
2. Open – slot type
Design of vernier motor

UNIT-2

STEPPING MOTOR
Introduction
Relation
Stepper motor
Application
Types of stepper motor
1. Variable reluctance
2. Permanenet magnet
3. Hybrid stepper motor
Classification
1. Single stock type
2. Multi stock type
Multi stack VRSM
Permanent magnet stepper motor
Hybrid stepper motor
Theory of torque prediction in stepping motor
Effects of mutual inductance
Characteristics of stepper motor
1. Static characteristics
a. Torque angle curve
b. Torque current curve
2. Dynamic characteristics
a. Torque verse stepping rate
b. Pull in curve
c. Pull out torque
d. Pull in rate
e. Response range
f. Slewing range
g. Mid frequency response
Stepper motor controller
Power drives
Power drives circuits
Drawbacks
Dual voltage drive
Chopper drive
Current suppression circuit
1. Diode suppression
2. Diode- resistor suppression
3. Diode – zener diode suppression
Linear analysis
Non-linear analysis

UNIT-3
SWITCHED RELUCTANCE MOTORS
Faraday’s law of electromagnetic induction
Faradays law of electromagtic intraction
Torque developed by reluctance
Variable reluctance principle
SRM
SRM principle
Construction
Power controller switching circuits
Advantages
Disadvantages
Split power supply converters
Dump c converters
Micro processor based control
Speed torque characteritics
Operating modes of SRM
1. Single pulse mode
2. PWM mode


UNIT-4

PERMANENT MAGNET BRUSHLESS DC motor
Conventional DC motor
Permanent magnet Dc motor
Advantages
Magnetic circuit analysis
Magnetic equivalent circuit
Torque equation
Power controller for BLPM square wave Dc motor
Drive circuit
Classification
Torque speed characteristics

Unit-5

Permanent magnet synchronous motor
Evolution of syn motor
3 phase BLPM syn motor
Principle of operation
Types of rotor
1. Peripheral
2. Interior
3. Claw pole
4. Transverse
EMF equation
Torque equation of BLPM sine wave motor

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