Abstract
Stator and translator pole width have a great effect on the LSRM's performance. However machining error and assembly error usually cause some dimensional difference among stators and translators. Thus a speed control method immune to dimensional difference is proposed for a four-phase linear switched reluctance motor (LSRM) with different pole width in this paper. The LSRM designed in such a structure is to explore how the pole width affects its performance and validate the proposed speed control method meanwhile. Since the parameters of each phase are non-identical due to the different pole width, a direct current controller is proposed. In order to avoid force dip, double phase excitation is suggested to against pole width variation and a new force distribution that is beneficial to reducing vibration and noise effectively is established. Finally, experiments are carried out to test and verify the speed control method. The speed response curves show the actual speed can be held within its specified value along the whole travel distance fast and precisely. Besides, the LSRM can track square and sinusoidal reference signal very well. All the experimental results validate that the proposed speed control method is immune to pole width variation and valid along the whole travel distance.
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