Characteristic analysis of salient pole halbachpermanent magnet synchronous linear motor
                                             WANG Xudong, ZHAI Zhongfei, XU Xiaozhuo, SUN WeiXiang, SHI Yufei
                                            (School of Electrical Engineering, Henan Polytechnic University, Jiaozuo 454000, China)

Abstract: Aiming at the problem of low thrust density of existing permanent magnet linear synchronous motor, a salient pole halbach permanent magnet Linear synchronous motor(SHPMLSM) was proposed. Firstly, the topology of salient pole halbach permanent magnet linear motor was introduced, based on the finite element method, the secondary magnetic field distribution of the motor was analyzed, the primary winding scheme of the motor was fixed. According as the rotating electrical machine characteristics, the main size of the SHPMLSM was determined. Secondly, the finite element simulation model of 16 pole 15 slots SHPMLSM unit motor was established, and the electromagnetic characteristics of the motor were researched. Lastly, under the same condition of permanent magnet dosage, primary winding and airgap, made comparisons with the SPMLSM, and the influence of changes of the salient pole’s width, height and PM’s magnetization direction on the performance of SHPMLSM was investigated. The simulation results indicate that the SHPMLSM unit motor has a higher thrust density than SPMLSM, the thrust of SHPMLSM increased by 10.61% than SPMLSM. With good magnetic shielding of Halbach array, the problem of magnetic leakage and low thrust of conventional PMLSM is improved.

Key words: salient pole halbach; permanent magnet linear motor; finite element; characteristic analysis