In this paper, is presented a fuzzy logic strategy in order to improve the angular resolution of the permanent magnet (PM) stepper actuator. Then, is described and discussed, in the first part, the conventional open loop microstepping technique which is realised by a Pulse Width Modulation. In the second part, a design of a new approach structured around the fuzzy logic controller is proposed. This control approach needs only the rotor position, which can be easily measured, to compute the control law. Finally, obtained simulation results are presented and discussed. These results confirm the efficiency of the proposed controller for the considerable improvement of the static and dynamic performances.
Fuzzy logic controller, Microstepping, Permanent magnet stepper motor, Incremental torque, positioning error.
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