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ABSTRACT
A new simple method for the preliminary calculation of pulsating torques in synchronous and asynchronous machines fed from current-impressing inverters is shown. The treatment is based on the analysis of the stator and rotor current-distribution waves represented as space phasors in a rotating coordinate system. The mean values of these complex space phasors depend on the fundamental harmonic of the stator currents and produce the wanted performance of the machine; the variable components, changing periodically, cause the oscillating torques. As the necessary data are obtained from the usual phasor diagram, and the torque calculation is very simple, the formulae can be easily evaluated for many operating states on which the oscillating torques strongly depend. The attention is focused on the effect of the commutation.