Abstract
The paper analyses the influence of the total harmonic deviation on supplementary losses and torque pulsations in the induction motor. By dissembling the deviation between the stator flux-linkage polygon and the fundamental circle into its components, a new insight is won. A near-minimum loss modulation strategi is derived, which turns out to be partly synchronous, partly asynchronous.By relating the motion of the stator flux-linkage vector along a polygon to individual switch operations in a voltage-link inverter, the criteria for adaptation to the limitations in the inverter switches are derived. Full utilization of the inverter capabilities at all motor frequencies can thus be achived.
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