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Simplified current minimizing algorithm for direct torque controlled IPM motor

Current minimization is the widely used optimization technique for control of IPM motors that optimizes the torque per current ratio and the copper losses of the motor. In this paper a simplified current minimization technique for direct torque controlled IPM drives is proposed by utilizing a normalized look up table that is independent of motor parameters. The implementation strategy also includes the effect of field weakening, both due to the operation of the the motor above rated speed and due to a reduction in the dc-link voltage. The control strategy is supported by simulation results and demonstrated experimentally using a 2.5 KW IPM motor.