Motor revs measuring method determines actual revs from measured rise in winding current during separation of motor from supply voltage via phase-chopping control

摘要

The revs measuring method determines the rise in the quasi-linear winding current of the motor, during each time phase in which the AC motor (1) is separated from the supply voltage by the phase chopping control (6), with the actual revs provided from the measured winding current after digital low-pass filtering. An Independent claim for a control system for an AC motor is also included.