Notes for an Introductory Course On Electrical Machines and Drives by E.G.Strangas

http://www.egr.msu.edu/~fzpeng/ECE320/ECE320-Notes-Part1.pdf
copy the link and paste on your adress bar or click on the title - notes for introductory course on elec. mach.

Contents


1 Three Phase Circuits and Power 1

1.1 Electric Power with steady state sinusoidal quantities 1
1.2 Solving 1phase problems 5
1.3 Threephase Balanced Systems 6
1.4 Calculations in threephase systems 9

2 Magnetics 15

2.1 Introduction 15
2.2 The Governing Equations 15
2.3 Saturation and Hysteresis 19
2.4 Permanent Magnets 21
2.5 Faraday’s Law 22
2.6 Eddy Currents and Eddy Current Losses 25
2.7 Torque and Force 27

3 Transformers 29

3.1 Description 29
3.2 The Ideal Transformer 30
3.3 Equivalent Circuit 32
3.4 Losses and Ratings 36
3.5 Perunit System 37
3.6 Transformer tests 40
3.6.1 Open Circuit Test 41
3.6.2 Short Circuit Test 41
3.7 Threephase Transformers 43
3.8 Autotransformers 44

4 Concepts of Electrical Machines; DC motors 47

4.1 Geometry, Fields, Voltages, and Currents 47

5 Threephase Windings 53

5.1 Current Space Vectors 53
5.2 Stator Windings and Resulting Flux Density 55
5.2.1 Balanced, Symmetric Threephase Currents 58
5.3 Phasors and space vectors 58
5.4 Magnetizing current, Flux and Voltage 60

6 Induction Machines 63

6.1 Description 63
6.2 Concept of Operation 64
6.3 Torque Development 66
6.4 Operation of the Induction Machine near Synchronous Speed 67
6.5 Leakage Inductances and their Effects 71
6.6 Operating characteristics 72
6.7 Starting of Induction Motors 75
6.8 Multiple pole pairs 76

7 Synchronous Machines and Drives 81

7.1 Design and Principle of Operation 81
7.1.1 Wound Rotor Carrying DC 81
7.1.2 Permanent Magnet Rotor 82
7.2 Equivalent Circuit 82
7.3 Operation of the Machine Connected to a Bus of Constant Voltage and Frequency 84
7.4 Operation from a Source of Variable Frequency and Voltage 88
7.5 Controllers for PMAC Machines 94
7.6 Brushless DC Machines 95

8 Line Controlled Rectifiers 99

8.1 1and 3Phase circuits with diodes 99
8.2 One Phase Full Wave Rectifier 100
8.3 Threephase Diode Rectifiers 102
8.4 Controlled rectifiers with Thyristors 103
8.5 One phase Controlled Rectifiers 104
8.5.1 Inverter Mode 104
8.6 ThreePhase Controlled Converters 106
8.7 *Notes 107


9 Inverters 109

9.1 1phase Inverter 109
9.2 Threephase Inverters 111

10 DC to DC Conversion 117

10.1 StepDown or Buck Converters 117
10.2 Stepup or Boost Converter 119
10.3 Buckboost Converter 122