Design of Electric Motors and Machines

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UNIT I INTRODUCTION 15
1.1) Major considerations in Electrical Machine Design 15
1.2) Electrical Engineering Materials 16
1.3) Space factor 21
1.4) Choice of Specific Electrical and Magnetic loadings 21
1.5) Thermal considerations 24
1.6) Heat flow 25
1.7) Temperature rise 25
1.8) Rating of machines 26
1.9) Standard specifications. 26
QUESTION BANK 27-30

UNIT II DC MACHINES 33
2.1) Introduction 33
2.2) Output Equations 34
2.3) Main Dimensions 36
2.4) Magnetic circuit calculations 39
2.5) Carter’s Coefficient 40
2.6) Net length of Iron 40
2.7) Real & Apparent flux densities 41
2.8) Selection of number of poles 44
2.9) Design of Armature 46
2.10) Design of commutator and brushes 50
2.11) Performance prediction using design values. 51
QUESTION BANK 53-57

UNIT III TRANSFORMERS 58
3.1) Design features of power and distribution type transformers 58
3.2) Output Equations 58
3.3) Main Dimensions 61
3.4) KVA output for single and three phase transformers 63
3.5) Window space factor 63

EE2355 DESIGN OF ELECTRICAL MACHINES
SCE 5 of 144 ELECTRICAL AND ELECTRONICS ENGINEERING
3.6) Overall dimensions 64
3.7) Operating characteristics 64
3.8) Regulation 64
3.9) No load current 64
3.10) Temperature rise in Transformers 65
3.11) Design of Tank 68
3.12) Methods of cooling of Transformers. 68
QUESTION BANK 69-74

UNIT IV INDUCTION MOTORS 75
4.1) Output equation of Induction motor 75
4.2) Main dimensions 79
4.3) Length of air gap 80
4.4) Rules for selecting rotor slots of squirrel cage machines 80
4.5) Design of rotor bars & slots 80
4.6) Design of end rings 81
4.7) Design of wound rotor 86
4.8) Magnetic leakage calculations 89
4.9) Leakage reactance of polyphase machines 89
4.10) Magnetizing current 89
4.11) Short circuit current 91
4.12) Circle diagram 91
4.13) Operating characteristics. 91
QUESTION BANK 92-96

UNIT V SYNCHRONOUS MACHINES 97
5.1) Introduction 97
5.2) Relative dimensions of Turbo and water wheel alternators: 102
5.3) Specifications of the synchronous machine: 103
5.4) Main Dimensions: 103
5.5) Output equations 103
5.6) Choice of Specific loadings: 104
5.7) Design of salient pole machines 106
5.8) Short circuit ratio 106
5.9) Length of the air gap: 109
5.10) shape of pole face 109
5.11) Armature design 110
5.12) Armature parameters 111
5.13) Estimation of air gap length 111
5.14) Design of rotor 111
5.15) Design of damper winding 112
5.16) Determination of full load field MMF 112
5.17) Design of field winding 112
QUESTION BANK 121-126
SOLVED PROBLEMS 127
MODEL QUESTION PAPERS 137

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