## Thyristor Control of Electric DrivesThe book provides tools for the analysis of electrical machines fed on thyristor converters. A detailed exposition of dc and ac drives is given for making the right choice of drive for a required job to give the desired performances. The aspect of phase controlled converters, inverters, frequency conversion using these converters and the method of improving the line conditions are discussed in detail. Mathematical modelling of both dc and ac motors is given. The aspects of performance of induction and synchronous motors of variable frequency supplies are provided. Also discussed are the features of dc motors operating on converters with respect to commutation, speed range, etc. Methods of improvement in the performance are suggested. A short description of micro-processors in the control of thyristorised ac and dc drives is also included |

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air gap flux applied voltage armature current back emf capacitor chopper circulating current components constant controlled converter copper losses current source inverter current waveform cycloconverter dc motor dc voltage delta connected depends determined discontinuous conduction drive dual converter equivalent circuit firing angle firing pulses flux linkages forced commutation Fourier series freewheeling diode fundamental half controlled half cycle harmonic content increases induction motor leakage reactance link current load current load voltage low frequencies low speeds method microprocessor mode obtained output voltage peak current performance phase controlled rectifier possible power factor ratio reactive power regeneration reversal ripple content rms value rotating rotor circuit rotor current rotor frequency series motor shown in Fig sinusoidal six-pulse slip speed control square wave stator current synchronous motor three-phase thyristor torque developed torque pulsations transformer two-quadrant variable frequency supply variation varied voltage applied voltage source voltage source inverter voltage waveform zero