基于谐波注入的永磁直线同步电机齿槽定位力补偿

Compensation for the Slot Force of Linear Permanent Magnet Synchronous Motors Based on Current Harmonics Injection

针对高精度直接驱动的永磁直线同步电机(Permanent Magnet Linear Synchronous Motor,PMLSM)伺服系统,研究其磁链谐波产生的齿槽定位力对系统伺服性能的影响,在利用有限元对PMLSM进行建模的基础上,对齿槽定位力的变化规律进行分析,通过傅里叶级数拟合得到齿槽定位力变化曲线,提出了一种新型的采用电流谐波注入法补偿齿槽定位力的控制策略,即通过注入谐波电流产生的推力抵消因磁链谐波引起的齿槽定位力,以达到补偿的目的,最后,搭建以DSP2812为核心的控制平台,通过实验实现了该控制算法,实验结果表明,该控制方案有效抑制了齿槽定位力引起的PMLSM伺服系统的推力和速度波动。

For the high precision direct drive permanent magnet linear synchronous motor （PMLSM） servo system, the influences of slot force due to magnetic chain harmonics to the servo performance are analyzed, a finite element model of PMLSM is created and the slot force is analyzed firstly. The slot force curve is fitted and obtained using Fourier series secondly. A new method is proposed in which harmonic current is added into the reference current to produce an additional thrust component which is used to compensate the slot force. Finally, experimental evaluations of the proposed scheme are carried out on a controlled PMLSM drive platform, the experimental results show that proposed scheme can be utilized to compensate thrust ripples in practical applications and improve the motion performance of PMLSM.