Power Semiconductor DrivesThe book is primarily intended for B.E./B.Tech. students of Electrical Engineering/Electrical and Electronics Engineering having courses in Electric Drives/Power Semiconductor Drives. It will also be highly useful for M.E./M.Tech. students of these disciplines specializing in Power Electronics/Industrial Drives/Electric Drives. The text is divided into eight chapters. The first two chapters cover the control of dc motors by using various kinds of converters. The third chapter focuses on dual converters and various braking techniques. Chopper control fed dc motors are discussed in the fourth chapter. The next three chapters are devoted to control methods for induction motors. The eighth chapter deals with the control of synchronous motor drives fed from VSI converters and cycloconverters. |
Contents
Control of DC Motor by Threephase Converters 77106 | 77 |
Fourquadrant Operations of DC Drives 107129 | 107 |
Review Questions | 124 |
Chopper Controlled DC Drives 130205 | 130 |
Stator Voltage Control of Induction Motor Drives 206251 | 206 |
Review Questions | 246 |
Control of Induction Motor Drives through Rotor Frequency 252282 | 252 |
Review Questions | 278 |
Control of Synchronous Motor Drives 328359 | 328 |
| 361 | |
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Common terms and phrases
ac supply armature circuit armature current armature resistance armature voltage back emf base speed braking operation Calculate chopper commutation constant continuous conduction controlled converter cycloconverter dc drives dc link dc series motor dc source diode bridge discontinuous conduction dual converter duty cycle duty ratio dynamic braking Example excited dc motor field field current Field resistance firing angle flux freewheeling diode full load IaRa induction motor load current load torque machine magnetic maximum torque mode motor current motor is controlled motor speed motor terminal voltage motoring operation phase power factor pulse-width modulated quadrant operation rad/s rated torque regenerative braking reversed rotor resistance control semi-converter separately excited dc shown in Fig single-phase slip power slip ring source voltage speed control speed—torque characteristics supply frequency supply voltage synchronous motor synchronous speed three-phase thyristor T1 variable frequency waveforms zero