槽楔材料对PMLSM电磁特性的影响

为提高PMLSM的电磁性能并降低齿槽力和推力波动,文中提出一种在直线电机槽口安装槽楔的解决方案。槽楔材料对电机性能影响较大,为了使电磁性能最佳,文中以分数槽永磁直线同步电机为研究对象,分析了槽楔材料为硬磁、软磁和非磁时对电机气隙系数的影响。利用有限元法对比分析了3种槽楔材料下电机的气隙磁场、反电动势、齿槽力和推力波动等电磁性能,并对不同负载下削弱推力波动的程度进行对比。分析结果表明,硬磁性材料可以有效降低齿槽力和推力波动。最后研究了不同相对磁导率下硬磁性材料对电机性能的影响,并得到电机性能最佳时的相对磁导率值,为进一步提高电机性能提供了理论基础。

Effect of Slot Wedge Material on Electromagnetic Characteristics of PMLSM

In order to improve the electromagnetic performance of permanent magnet linear synchronous motor and reduce the cogging force and thrust ripple, a solution of installing slot wedge at the slot of the motor is proposed in this paper. Different materials of slot wedge have different optimization effective for the motor. To obtain the best electromagnetic performance, fractional slot permanent magnet linear synchronous motor is taken as the research object, the influence of hard magnetic, soft magnetic and non-magnetic slot wedge on the air gap coefficient of the motor is calculated. Meanwhile, the air gap magnetic field, back electromotive force, cogging force and force ripple of three slot wedge materials are compared and analyzed by finite element method, and the degree of reducing thrust fluctuation under different loads is analyzed. The results show that the hard magnetic material can effectively reduce the cogging force and thrust fluctuation. Finally, the influence of hard magnetic materials on motor performance under different relative permeability is investigated, and the relative permeability value at the best performance of the motor is obtained, which provids a theoretical basis for further improvement of the motor performance.