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A torque control system for DDM (direct drive motor) with a permanent magnet rotor equipped with a torque observer implemented by software of a digital signal processor is proposed. The speed fluctuation against a disturbance can be fully removed with a torque feedforward loop. It is shown that the direct motor control system with a torque observer gives a superior speed control characteristics. Furthermore, the system has a robustness against disturbing torque and a variation of mechanical parameters.>
Matsui et al. (Mon,) studied this question.