An Adaptive Electromagnetic Force Distribution Method Based on a Double-sided Switched Reluctance Linear Motor

This paper proposes a method of suppressing the force ripple of a 100W double-sided switched reluctance motor. First, for precise control of the rising phase of the electromagnetic force, an inductance model based on the sigmoid function is proposed. Compared with the polynomial and sinusoidal models, the fitting results show that the proposed inductance model has higher accuracy during the rising region, in which the relative position of 5-20mm. Then the reference current can be solved according to the inductance model. Besides, to avoid the appearance of the negative force, only the rising process is controlled in this paper. Due to the limited travel, the velocity of the linear motor is always an acceleration-smooth-deceleration process, to suppress electromagnetic force pulsation in a wider speed range, a method of turn-on position adaption is adapted. The experimental results show that the proposed method has better performance than the cubic force distribution performance, which is verified by the simulation and experiments.