Abstract
In this paper a unified approach for several synchronous machine current waveform optimization problems is presented. It is shown that the problems of ohmic losses minimization with and without the constraint of constant torque waveform admit solutions which can be described by the same equation in different vector spaces. The constraint of open-circuited neutral node is also investigated and it is shown that in the unified framework only a minor modification of the solution is needed irrespectively of the presence of the constant torque constraint. The ohmic losses and the torque ripple of the various waveforms are compared in the case of a permanent magnet synchronous generator used in a variable speed wind turbine. The optimal waveforms are also compared to non-optimal waveforms obtained using a diode rectifier.
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