Voltage-controlled, inverter-motor system

摘要: A relatively simple inverter-motor system, comprising a minimum number of circuit components, is provided by employing voltage-controlled thyristor inverter (65,111) which in turn drives synchronous motor (81) having leading power factor. With the current voltage, switching devices (71-76,114-119) will be motor-commutated, thereby precluding need for any auxiliary commutating elements or circuits to effect forced commutation. Since, with factor, through conducting falls zero before has switched off, ample turn-off time provided. Furthermore, as compared conventional commutated voltage source inverter, customary reactive diodes, usually shunting an permit flow current, are not necessary. Moreover, powering (51,62,64,110), rather than source, commutation process greatly facilitated, damper windings on eliminated, and physical size d-c link inductor normally required reduced.