| Abstract |
In this paper a non-sinusoidal non-salient PMSM of high phase number, separately supplied by its own H-bridge VSI, is studied. This segmented architecture of supply gives a high degree of redundancy to the assembly H-bridge VSIs - high phase number PMSM. In addition to the modularity of the used H-bridge VSI, which can lead to a considerable economical gain, each H-bridge has to transit lower rates of power. This enables us to impose a current waveform, which is more similar to optimal waveforms, by switching at higher frequency. In the first part, under normal operating conditions, a trapezoidal current waveform is defined in order to minimize the torque ripple rate and the copper losses. In the second part, several methods to reduce the torque undulation generated by one or several disconnected phases are presented and their performances are compared. The most efficient methods are the ones based on the modification of one or several phase current waveforms. |
