无铁心永磁同步直线电机推力谐波分析与消除

Analysis and Elimination of Harmonics in Force of Ironless Permanent Magnet Linear Synchronous Motor

直线电机的推力波动较大,限制其在超精密领域的应用。推力中的谐波是无铁心永磁同步直线电机推力波动的主要原因之一,消除推力中的部分谐波可以有效降低推力波动。该文建立了无铁心永磁体同步直线电机推力谐波的解析模型,揭示了结构参数与推力波动间的关系,并提出了低推力波动直线电机的设计准则。将设计准则应用于一类直线电机的优化设计中,提出了消除推力中特定阶次谐波的结构参数设计方法。设计结果与有限元仿真结果和实验结果进行比对,验证了解析模型的准确性和设计方法的有效性。

The force ripples in the linear motor make it infeasible to apply in the ultra-precision machines. The harmonics are the main contribution in the force ripples of the ironless permanent magnet synchronous linear motor （ILPMLSM）, eliminating some of the harmonics can effectively reduce the force ripples. In this paper, the analytical model of harmonics in the force tipples of the ILPMLSM was established and the relationship between the force ripples and structural parameters was revealed. Based on these, a novel design principle aiming to reduce the force ripples was proposed. The design method for the structural parameters was derived by applying this design principle into the optimal design of a specified type of linear motors. This design method could eliminate the specified harmonics in the force ripples. Finally, the correctness of the analytical model of the force ripples and the effectiveness of the design method were validated by both FEA and experimental test.