Power Electronics: Solid State Motor Control

ac source AC supply amplitude anode applied armature basic circuit bridge converter capacitor chopper commutation conduction configuration cycle cycloconverter dc link converter dc load dc motor DC terminal voltage dc voltage device diode drive dv/dt dynamic braking feedback firing delay angle flux forward current frequency gate current gate pulse gate signal half-cycle increase induction motor inductive load input inverter JEDEC leakage load current maximum mean dc mean output voltage method midpoint converter motor speed negative groups operation optocouplers phase control phase-locked loop polyphase induction motor positive pulse transformer pulse width modulation reactance reactor rectifier reduced resistance result reverse-biased rotor SCR1 SCR2 SCR3 SCR4 SCRI shown in Fig Single-phase AC six-pulse snubber source voltage speed control static stator supply voltage switching synchronous three-phase thyristor toFF torque transient transistor TRIAC trigger turn-off turn-on turned two-pulse variable voltage control voltage Vdoa voltage waveform waveform zero