LAUSR

The longitudinal end effect (LEE) has a negative influence on the performance of the flat-type switched-reluctance linear machines (SRLMs). For example, it can give rise to the imbalance of peak currents of different phases and the aggravation of the force ripple. This study proposes a modified current estimation model and an adaptive adjustment method (AAM) of turn-on position to compensate for the LEE of SRLMs. The modified current estimation model considers not only the self-inductance characteristics but also the mutual inductance characteristics. Some simulation results demonstrate that this modified estimation model has better estimation accuracy than a previous one. Then, the AAM of turn-on position is proposed based on this modified current estimation model. It can balance the peak currents of different phases so that the negative impact of the LEE is greatly reduced. This new control method is easy to implement and requires little test, and its effectiveness in compensating for the peak currents and reducing force ripple is experimentally verified.