The control of electric motors by means of power electronic converters has a number of significant side-effects. These are primarily due to the introduction of additional frequency components into the voltage and current waveforms applied to the motor. In the case of a.c. machines, which are originally intended to operate at fixed speed, there are additional implications that need to be considered, including mechanical speed limits and the possible presence of critical speeds within the operating speed range.

Inspec keywords: motor drives; machine control; power convertors

Other keywords: A.C. machine; power electronic converter; electric motors control; mechanical speed limits; control technique drives

Subjects: Drives