Abstract

A variable structure based flux linkage controller scheme, which takes into account the limitations imposed by the finite DC-link voltage and rotor speed when calculating the reference flux values, is proposed. Correct selection of the flux reference parameters nearly allows the achievement of constant torque operation over wide speed and torque ranges. In order to use the controller described a current gauge curve model is developed, based on an idea similar to the flux linkage gauge curve model of Stiebler and Ke-Liu (1999). Simulation results illustrate that the proposed approach provides lower torque ripples than other existing techniques.

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