Abstract
This paper describes the application of direct torque control (DTC) to a PM brushless AC machine whose back-emf waveform is non-sinusoidal, and compares its performance with that which is achieved when the back-emf waveform is assumed to be sinusoidal. It also demonstrates the utility of employing a sliding mode observer to estimate the back-emf waveform, and, thereby, to calculate the instantaneous electromagnetic torque and to minimise torque ripple. The effectiveness of this approach is validated by both simulations and measurements.
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