The DC brushless motor, Permanent Magnet Type Synchronous Motor (PM motor), has been widely used in the field of the industrial robots, the machine tools for factory and factory automations. Therefore, it is more desirable to improve the performance of PM motor variable speed control system. Though only the torque component current is adjusted as the control method for PM motor, that is named Vector Control, it is expected that the developed characteristics is added to PM motor.
In this paper, new driving methods for PM motor and a new design method for the variable speed control system are presented. The new motor driving methods, which bring to PM motor new driving performance, such as a quick transient response or the high efficiency motor driving, can be implemented by controlling not only the torque component current, but also the magnetizing component current. A developed optimal control theory, Error System Technique, is employed for designing the control system. The control law is endowed with a steady robustness against the variation of the system parameters and the ability of compensating the delay time due to the control processing.
The effectiveness of the proposed method is comfirmed by simulations and experiments.
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