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Experimental nonlinear torque control of a permanent-magnet synchronous motor using saliency

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5 Author(s)
Grenier, D. ; Lab. d''Electrotech. et d''Instrum., Univ. Catholique de Louvain, Belgium ; Dessaint, L.-A. ; Akhrif, O. ; Bonnassieux, Y.
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In this paper, a new nonlinear control strategy is proposed for a permanent-magnet salient-pole synchronous motor. This control strategy simultaneously achieves accurate torque control and copper losses minimization without recurring to an internal current loop nor to any feedforward compensation. It takes advantage of the rotor saliency by allowing the current (id) to have nonzero values. This, in turn, allows us to increase the power factor of the machine and to raise the maximum admissible torque. We apply input-output linearization techniques where the inputs are the stator voltages and the outputs are the torque and a judiciously chosen new output. This new output insures a well-defined relative degree and is linked to the copper losses in such a way that, when forced to zero, it leads to maximum machine efficiency. The performance of our nonlinear controller is demonstrated by a real-time implementation using a digital signal processor (DSP) chip on a permanent-magnet salient-pole synchronous motor with sinusoidal flux distribution. The results are compared to the ones obtained with a scheme which forces the id current to zero

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:44 ,  Issue: 5 )

Date of Publication:

Oct 1997

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