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The direct torque control system has excellent dynamic performance of electromagnetic torque; however, the dynamic performance of the speed is affected by the proportional-integral parameters of the speed closed loop. Hence, a control method which can realize the optimal dynamic performance of the speed is investigated in this paper. In this method, the integration balance of sine value for the torque angle is introduced; based on this, the speed and the electromagnetic torque can be controlled to converge simultaneously after the speed adjusting only once. Thus, the best possible dynamic response for the speed can be achieved. The proposed method is verified by both simulation and experimental results.
Wang et al. (Wed,) studied this question.