New approach for thrust ripple reduction on permanent magnet flux-switching linear motor

Permanent magnet flux-switching linear motor (PMFSLM) has widely potential application for railway, servo, and electromagnetic launch device and so on. However, it suffers large thrust fluctuation and flux leakage, which brings ill influence to its output performance. In this paper, a novel topology with the back iron and permanent magnets placed above the mover is proposed. First, it analyzes the defects of traditional PMFLSM, such as large flux leakage, high thrust ripple. Then 2-D finite element algorithm (FEA) is applied on both traditional topology and the proposed one to get comparative performance analysis. Simulation results demonstrate that the new topology can get higher thrust, lower thrust ripple and less flux leakage in response to those of conventional structures.