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Introduction – applications – torque speed characteristics of three phase induction motor – speed control of induction motor – stator voltage control, variable frequency control – necessity of maintaining v/f ratio constant – rotor resistance control – inverters for variable voltage and frequency control – speed control by rotor resistance for slip ring motors – static scherbius drive (slip power recovery scheme) – closed loop control of  AC drive – block diagram – microcomputer based pulse width modulation control of  induction motor drive.

Cycloconverter  -  introduction – single phase to single phase cycloconverter – input, output waveform  with resistive load – single phase bridge type cycloconverter – three phase to three phase cycloconverter – schematic diagram, basic circuit and working.