Analysis and Suppression of Detent Force in PMLSM

Abstract

Detent force has been become the main source of permanent magnet linear synchronous motor (PMLSM) shake and noise, is also a primary factor to evaluate the performance of PMLSM. To improve performance and reduce noise of PMLSM, in which the end component of detent force affects mainly on the machine performance, the paper presents its mechanism, reduction technique and research also the slot-tooth component under using the technique. The finite element method (FEM) is adopted to attain the relation of between the detent force and the mover position, and analyze profoundly the waveform of the end component and the slot-tooth component, especially at the outlet end. At the same time, the end shape of the primary core is optimum to suppress the end component of detent force. According to the analysis results on the left and right end component of detent force, the method of Fourier series to research the end component at the outlet end is unreasonable. As results show that the change of the end shape is effective technique to reduce the end component and not to influence slot-tooth component. FEA results are confirmed by the experimental ones.