Electric machinery / 6th ed.

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作   者:A.E. Fitzgerald, Charles Kingsley, Jr., Stephen D. Umans.

分类号:

ISBN:9787302067054

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简介

   本书特色    1.内容系统全面,基本上涵盖了目前常见的各种电机和基本控制方法。本书从磁路和磁性材料开始讲起,不但介绍了传统的变压器和旋转电机,还涉及了机电能量转换原理、永磁电机、单相感应电机、开关磁阻电机、直线电机、电力电子技术介绍、电机的速度与转矩控制等内容。    2.内容编排方式与常见的电机学教材不同。例如,在介绍旋转电机之前,先比较详细地介绍了机电能量转换原理;然后对旋转电机的共同问题(磁动势、电动势、电磁转矩等)统一进行介绍;最后再分别说明各类电机的特性。    5.注重概念方法。从内容的整体编排到具体内容的叙述,都体现了突出电机学的物理概念、强调电机学基本分析方法的指导思想。为避免读者陷入复杂的数学计算中,还引入了Matlab作为辅助的计算工具。全书思路清晰,文字严谨流畅,清楚易懂。    4.理论联系实际。书中采用了许多实物的图片,并在附录中专门介绍了一些电机工程实际问题。这样可使读者比较清楚地了解电机理论与实际电机间的对应关系,有助于对基本原理和概念的理解。    5.例题习题丰富。作者或者通过例题对前面内容做进一步的解释,或者直接把例题本身作为对基本概念和原理的带有定量计算的说明,使例题和其他内容有机地融为一体。   

目录

preface xii

chapter 1 magnetic circuits and magnetic materials 1

1.1 introduction to magnetic circuits 2

1.2 flux linkage, inductance, and energy 11

1.3 properties of magnetic materials 19

1.4 ac excitation 23

1.5 permanent magnets 30

1.6 application of permanent magnet materials 35

1.7 summary 42

1.8 problems 43


chapter 2 transformers 57

2.1 introduction to transformers 57

2.2 no-load conditions 60

2.3 effect of secondary current; ideal transformer 64

2.4 transformer reactances and equivalent circuits 68

2.5 engineering aspects of transformer analysis 73

2.6 autotransformers; multiwinding transformers 81

2.7 transformers in three-phase circuits 85

2.8 voltage and current transformers 90

.2.9 the per-unit system 95

2.10 summary 103

2.11 problems 104


chapter 3 electromechanical-energy-conversion principles 112

3.1 forces and torques in magnetic field systems 113

3.2 energy balance 117

3.3 energy in singly-excited magnetic field systems 119

3.4 determination of magnetic force and torque from energy 123

3.5 determination of magnetic force and torque from coenergy 129

3.6 multiply-excited magnetic field systems 136

3.7 forces and torques in systems with permanent magnets 142

3.8 dynamic equations 151

3.9 analytical techniques 155

3.10 summary 158

3.11 problems 159


chanter 4 introduction to rotating machines 173

4.1 elementary concepts 173

4.2 introduction to ac and dc machines 176

4.3 mmf of distributed windings 187

4.4 magnetic fields in rotating machinery 197

4.5 rotating mmf waves in ac machines 201

4.6 generated voltage 208

4.7 torque in nonsalient-pole machines 214

4.8 linear machines 227

4.9 magnetic saturation 230

4.10 leakage fluxes 233

4.11 summary 235

4.12 problems 237


chapter 5 synchronous machines 245

5.1 introduction to polyphase synchronous machines 245

5.2 synchronous-machine inductances; equivalent circuits 248

5.3 open- and short-circuit characteristics 256

5.4 steady-state power-angle characteristics 266

5.5 steady-state operating characteristics 275

5.6 effects of salient poles; introduction to direct- and quadrature-axis theory 281

5.7 power-angle characteristics of salient-pole machines 289

5.8 permanent-magnet ac motors 293

5.9 summary 295

5.10 problems 297


chapter 6 polyphase induction machines 306

6.1 introduction to polyphase induction machines 306

6.2 currents and fluxes in polyphase induction machines 311

6.3 induction-motor equivalent circuit 313

6.4 analysis of the equivalent circuit 317

6.5 torque and power by use of thevenin's theorem 322

6.6 parameter determination from no-load and blocked-rotor tests 330

6.7 effects of rotor resistance; wound and double-squirrel-cage rotors 340

6.8 summary 347

6.9 problems 348


chapter 7 dc machines 357

7.1 introduction 357

7.2 commutator action 364

7.3 effect of armature mmf 367

7.4 analytical fundamentals: electric-circuit aspects 370

7.5 analytical fundamentals: magnetic-circuit aspects 374

7.6 analysis of steady-state performance 379

7.7 permanent-magnet dc machines 384

7.8 commutation and interpoles 390

7.9 compensating windings 393

7.10 series universal motors 395

7.11 summary 396

7.12 problems 397


chapter 8 variable-reluctance machines and stepping motors 407

8.1 basics of vrm analysis 408

8.2 practical vrm configurations 415

8.3 current waveforms for torque production 421

8.4 nonlinear analysis 430

8.5 stepping motors 437

8.6 summary 446

8.7 problems 448


chapter 9 single- and two. phase motors 452

9.1 single-phase induction motors: qualitative examination 452

9.2 starting and running performance of singlephase induction and synchronous motors 455

9.3 revolving-field theory of single-phase induction motors 463

9.4 two-phase induction motors 470

9.5 summary 488

9.6 problems 489


chapter 10 introduction to power electronics 493

10.1 power switches 494

10.2 rectification: conversion of ac to dc 507

10.3 inversion: conversion of dc to ac 538

10.4 summary 550

10.5 bibliography 552

10.6 problems 552


chapter 11 speed and torque control 559

11.1 control of dc motors 559

11.2 control of synchronous motors 578

11.3 control of induction motors 595

11.4 control of variable-reluctance motors 613

11.5 summary 616

11.6 bibliography 618

11.7 problems 618


appendix a throe-phase circuits 628

a.1 generation of three-phase voltages 628

a.2 three-phase voltages, currents, and power 631

a.3 y-and a-connected circuits 635

a.4 analysis of balanced three-phase circuits; single-line diagrams 641

a.5 other polyphase systems 643


appendix b voltages, magnetic fields, and inductances of distributed ac windings 644

b.1 generated voltages 644

b.2 armature mmf waves 650

b.3 air-gap inductances of distributed

windings 653


appendix c the dqo transformation 657

c.1 transformation to direct- and quadrature-axis variables 657

c.2 basic synchronous-machine relations in dq0 variables 660

c.3 basic induction-machine relations in dq0 variables 664


appendix d engineering aspects of practical electric machine performance and operation 668

d.1 losses 668

d.2 rating and heating 670

d.3 cooling means for electric machines 674

d.4 excitation 676

d.5 energy efficiency of electric machinery 678


appendix e table of constants and conversion factors for si units 680

index 681


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