CONTENTS
PrefaceChapter 0Introduction1
01The role of electrical machines in our lives1
02Types of electrical machines2
03Materials used in internal structure of electrical machines2
04Magnetic circuits3
041Magnetic fields3
042Magnetic circuits5
043Magnetic behaviors of ferromagnetic materials10
044Energy losses in a ferromagnetic core10
05Related laws13
051Faradays law of electromagnetic induction13
052Production of induction force on a wire14Chapter 1DirectCurrent Machines15
11Introduction to DC machines15
111Construction of DC machines15
112Principles of DC generators18
113Principles of DC motors19
114The excitation of DC machines19
115The ratings of DC machines20
12Armature windings21
121Simplex lap windings23
122Simplex wave windings25
13Magnetic fields of DC machines26
131Magnetic field in noload condition27
132Magnetic field in loaded condition27
14Induced voltage and electromagnetic torque31
141Induced voltage31
142Electromagnetic torque32
15Equivalent circuits of DC machines34
151Equivalent circuits of DC generators34
152Equivalent circuits of DC motors36
16Power flow and losses in DC machines37
161Losses in DC machines38
162The powerflow of DC generators38
163The powerflow of DC motors39
17Operational characteristics of DC generators39
171Operational characteristics of separately excited DC generators40
172Operational characteristics of shunt DC generators43
173Operational characteristics of compounded DC generators45
〖〗目录Electric Machinery电机学18Operational characteristics of DC motors47
181The separately excited DC motor and shunt DC motor47
182The operational characteristics of the series DC motor53
183The operational characteristics of the compound DC motor55
184Reversing the rotation direction of a DC motor56
19Speed control of shunt DC motors57
110Starting a DC motor61
111Braking a DC motor61
1111Dynamic braking62
1112Plugging63
112Commutation64
Summary66
Questions and problems68Chapter 2Transformers72
21Construction and ratings of transformers72
211Construction of transformers72
212Ratings of transformers73
22Analysis of single phase transformers in noload condition75
221Physical situation of transformers in noload condition75
222The noload current, flux and induced emf of a transformer76
223The equivalent circuit and phasor diagram of transformers in noload condition77
23Operation of transformers in loaded condition78
231Physical situation of transformers in loaded condition78
232The equivalent circuit and phasor diagram of a transformer in loaded condition79
24Determining parameters of transformers by tests82
241Opencircuit test82
242Shortcircuit test83
243The perunit system84
25Voltage regulation and efficiency of transformers88
251Terminal characteristic and voltage regulation88
252Efficiency89
26Threephase transformers91
261Magnetic circuit of threephase transformers91
262Connections of threephase transformers91
27Parallel operation of transformers94
28Special Transformers95
281Autotransformers96
282Instrument transformers97
Summary97
Questions and problems99Chapter 3AC Machine Fundamentals103
31Operation principles of the threephase synchronous generator103
32AC windings104
321The basic concept of AC windings104
322Threephase singlelayer lap winding106
323Threephase doublelayer lap winding107
33Induced Emf of AC winding108
331Emf of a conductor108
332Emf of a coil and pitch factor109
333Emf of coil group and breadth or distribution factor110
334Fundamental emf of a phase winding110
335Harmonic emf of a phase winding111
34Operation principles of the threephase induction motor112
35Mmf of an AC winding113
351Mmf of a singlephase winding113
352Mmf of a threephase winding117
Summary119
Questions and problems120Chapter 4Induction Machines122
41Construction and ratings of induction motors122
411Construction of induction motors122
412Operation modes of induction machines123
413Ratings of induction motors125
42Electromagnetic relations of an induction motor125
421Main flux and leakage flux of an induction motor125
422Electromagnetic relations of an induction motor126
43Equivalent circuit of an induction motor130
431Frequency conversion130
432Winding conversion132
433Equivalent circuit and phasor diagram133
434Analysis of induction motor when the load changed134
435Approximate equivalent circuit134
44Power and torque equation of an induction motor136
441Power equation136
442Torque equation137
443Electromagnetic torque137
45The pole and phase number of the cage rotor138
451The phase number of the cage rotor138
452Pole number of the cage rotor138
46Determining circuit model parameters139
461Noload test140
462Lockedrotor test141
47Operational characteristics of induction motors143
48Torque speed characteristics of induction motors144
49Starting the threephase induction motor148
491The starting methods of the threephase induction motors149
492Cage rotor induction motors with high starting torque151
410Speed control of induction motors153
4101Speed control by changing pole number153
4102Speed control by changing frequency154
4103Speed control by changing the stator voltage156
4104Speed control by changing rotor resistance156
4105Woundrotor induction motor cascade speed control156
Summary158
Questions and problems159Chapter 5Synchronous Machines163
51Construction, operation modes and ratings of a synchronous machine163
511Construction of a synchronous machine163
512Operation mode of a synchronous machine166
513Ratings of a synchronous machine167
52Operation of synchronous generators168
521Noload operation of synchronous generators168
522Loaded operation of synchronous generators170
53Voltage equation,phasordiagram and equivalent circuit of synchronous
generators173
531Voltage equation, phasordiagram and equivalent circuit of cylindrical rotor
synchronous generators174
532Voltage equation and phasordiagram of salientpole synchronous generators178
54Power and torque equation of synchronous generators181
55Operational characteristics of synchronous generators182
56Parallel operation of synchronous generators185
561The need to synchronize186
562Powerangle characteristics of salientpole synchronous generators188
563Active power regulation and static stability189
564Reactive power regulation and Vcurves193
57Synchronous motors195
571Voltage equation, phasor diagram and equivalent circuit of synchronous motors195
572Powerangle characteristic, power and torque equations of synchronous motors196
573Reactive power regulation196
574Starting synchronous motors198
Summary199
Questions and problems201
中文部分
绪论207
01电机在国民经济中的作用207
02电机的主要类别208
03电机中所用的材料208
04磁路208
041磁场208
042磁路的概念210
043铁磁材料的性质213
044铁心损耗214
05相关的电磁定律215第1章直流电机217
11直流电机的基本结构、工作原理、励磁方式和额定值217
111直流电机的基本结构217
112直流发电机的工作原理218
113直流电动机的工作原理218
114直流电机的励磁方式219
115直流电机的铭牌数据219
12直流电机的电枢绕组220
121单叠绕组222
122单波绕组223
13直流电机的磁场223
131直流电机空载时的气隙磁场224
132直流电机带负载时的气隙磁场和电枢反应224
14直流电机的感应电动势和电磁转矩226
141直流电机的感应电动势226
142直流电机的电磁转矩227
15直流电机的等效电路229
151直流发电机的等效电路229
152直流电动机的等效电路229
16直流电机的损耗与功率流程230
161直流电机内部的损耗230
162直流发电机的功率流程231
163直流电动机的功率流程231
17直流发电机的运行特性232
171他励直流发电机的运行特性232
172并励直流发电机的运行特性233
173复励直流发电机的运行特性235
18直流电动机的运行特性235
181他励和并励直流电动机的运行特性236
182串励直流电动机的运行特性241
183复励直流电动机的运行特性242
184直流电动机旋转方向的改变方式242
19并励直流电动机的转速调节243
110直流电动机的起动245
111直流电动机的制动245
1111能耗制动245
1112反接制动246
112直流电机的换向247
本章小结248
习题250第2章变压器254
21变压器的基本结构与额定值254
211变压器的基本结构254
212额定值255
22变压器的空载运行255
221空载运行时的物理过程255
222空载运行时的主要物理量256
223变压器的空载等效电路和相量图257
23变压器的负载运行258
231负载运行的物理过程258
232变压器的等效电路和相量图259
24变压器的参数测定261
241空载试验261
242短路试验261
243标幺值262
25变压器的运行特性265
251外特性和电压变化率265
252效率和效率特性266
26三相变压器267
261三相变压器的磁路系统267
262三相变压器的联结组267
27变压器的并联运行269
28自耦变压器和仪用互感器270
281自耦变压器270
282仪用互感器270
本章小结271
习题272第3章交流电机的共同理论276
31三相同步发电机的工作原理276
32交流绕组276
321交流绕组的基本概念277
322三相单层叠绕组277
323三相双层叠绕组278
33交流绕组的感应电动势279
331导体电动势279
332线圈电动势和节距因数279
333线圈组电动势和分布因数280
334相绕组的基波电动势281
335相绕组的谐波电动势281
34三相感应电动机的工作原理283
35交流绕组的磁动势283
351单相交流绕组的磁动势——脉振磁动势284
352三相交流绕组的合成磁动势——旋转磁动势287
本章小结288
习题289第4章感应电机291
41感应电机的基本结构和额定值291
411感应电机的基本结构291
412感应电机的运行状态292
413感应电动机的额定值292
42感应电动机内部的电磁关系293
421感应电动机的主磁通和漏磁通293
422感应电动机的电磁关系294
43感应电动机的等效电路296
431频率归算296
432绕组归算297
433等效电路和相量图298
434感应电动机负载变化时的物理过程298
435感应电动机的近似等效电路299
44感应电动机的功率方程和转矩方程300
441功率方程300
442转矩方程301
443电磁转矩301
45笼型转子绕组的相数和极数302
451笼型转子的相数302
452笼型转子的极数302
46感应电动机的参数测定303
461空载试验303
462堵转试验303
47感应电动机的工作特性304
48感应电动机的机械特性305
49三相感应电动机的起动308
491三相感应电动机的起动方法308
492高起动转矩的三相笼型感应电动机310
410三相感应电动机的调速312
4101变极调速312
4102变频调速313
4103降低定子电压调速314
4104转子回路串接电阻调速314
4105串级调速314
本章小结315
习题316第5章同步电机320
51同步电机的基本结构、运行状态和额定值320
511同步电机的基本结构320
512同步电机的运行状态321
513同步电机的额定值321
52同步发电机的空载和负载运行322
521同步发电机的空载运行322
522同步发电机的负载运行323
53同步发电机的电压方程、相量图和等效电路325
531隐极式同步发电机的电压方程、相量图和等效电路326
532凸极式同步发电机的电压方程和相量图327
54同步发电机的功率方程和转矩方程330
55同步发电机的运行特性331
56同步发电机与电网的并联运行334
561并联运行的条件334
562凸极式同步发电机的功角特性335
563有功功率的调节和静态稳定336
564无功功率的调节和V形曲线340
57同步电动机341
571电压方程、相量图和等效电路341
572功角特性、功率方程和转矩方程341
573无功功率和功率因数的调节342
574同步电动机的起动343
本章小结344
习题345参考文献349