Abstract
SUMMARYThis paper presents a method for electromagnetic torque ripple and copper losses reduction in (non‐sinusoidal or trapezoidal) surface‐mount permanent magnet synchronous machines (SM‐PMSM). The method is based on an extension of classical dq transformation that makes it possible to write a vectorial model for this kind of machine (with a non‐sinusoidal back‐EMF waveform). This model is obtained by the application of that transformation in the classical machine per‐phase model. That transformation can be applied to machines that have any type of back‐EMF waveform, and not only trapezoidal or square‐wave back‐EMF waveforms. Implementation results are shown for an electrical converter, using the proposed vectorial model, feeding a non‐sinusoidal synchronous machine (brushless DC motor). They show that the use of this vectorial mode is a way to achieve improvements in the performance of this kind of machine, considering the electromagnetic torque ripple and copper losses, if compared to a drive system that employs a classical six‐step mode as a converter. Copyright © 2011 John Wiley & Sons, Ltd.
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