空心永磁直线电机的优化设计

Optimization Design of Air-core Permanent Magnet Linear Motor

空心永磁直线电机(PMLSM)具有高速、高加速度、高精度等优点,在多种直线直驱场合获得广泛的应用。本文针对一个应用于垂直运行场合的3线圈空心PMLSM建立了解析模型,计算了空载反电势与推力,并由有限元模型进行了验证,然后在分析了关键结构参数对推力的影响后,采用遗传算法完成了三种不同槽极配合空心PMLSM的优化设计,得到推力密度高且推力波动小的优化方案,研究为该类电机的优化设计提供了参考。

The air-core permanent magnet linear synchronous motor(PMLSM) has the advantages of high speed, high acceleration, high precision, which has been widely applied in many occasions with linear direct drive motion. In this paper, an analytical model of a 3-coil air-core PMLSM used in vertical motion was established, and then the no-load back EMF and thrust force were calculated and also verified by the finite element model. After the influences of key structural parameters on the thrust force were investigated, the optimization designs of three air-core PMLSMs with different slot/pole combination were completed by genetic algorithm. It was shown the optimization scheme has high thrust density and small thrust fluctuation. The research can provide a reference for the optimal design of this kind of motor.