This paper presents a robust position controller of the permanent magnet stepper motor, used in tracking periodic references. The variable structure control strategy using the sliding mode is applied since it offer a number attractive properties. In this study, a field-oriented hybrid stepper motor is considered in order to improve the dynamic performances of the system drive. By means of the field-oriented the independent control between torque and flux in the hybrid stepper motor becomes possible and the behavior is like a high dynamic AC servo drive. The operation in sliding regime improves the dynamic responses and offer advantages as insensitive to the parameter variations or external disturbance. Simulation and experimental results are presented to illustrate the potential of this controller designed to track periodic references.
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