大型望远镜拼接弧线永磁电机电流谐波抑制

Current harmonics suppression of the large aperture telescope based on segmented arc PMSM

望远镜口径的增加使得其轴系驱动电机越来越大,近年来拼接电机成为国际上研究的热点。拼接弧线永磁电机的电流谐波影响大型天文望远镜目标观测轴系跟踪精度,文中根据拼接弧线电机的数学模型及谐波分析,提出了一种基于准比例-谐振控制器的电流谐波抑制算法,并设计了单元拼接弧线电机相应的电流控制器。仿真和实验分别对比了PI和准比例谐振控制器对电流谐波的影响。实验结果表明,采用准比例谐振控制器时,拼接弧线电机定子电流中的5次谐波分量削弱了63.3%,7次谐波分量削弱了34.4%,11次谐波分量削弱了51%,13次谐波分量削弱了59.2%,大大降低了拼接弧线电机电流谐波,有助于提高望远镜跟踪精度。

With the increasing of telescope aperture,the main axis driving motor is becoming larger and larger,and the segmented motor has become a hot topic in international astronomy research today.The current harmonics of the segmented Arc Permanent Magnet Synchronous Motor(APMSM)influence the tracking accuracy of the large aperture telescope.According to the mathematical model and harmonic analysis of segmented APMSM,a current harmonic suppression algorithm based on Quasi-Proportional Resonant(QPR)controller was proposed,and the current controller of unit segmented APMSM was designed.The effect of PI and the QPR controller on current harmonics from simulation and experiment was compared respectively.The experimental results show that when using QPR controller,the 5;harmonic order,the 7;harmonic order,the 11;harmonic order and the 13;harmonic order of the stator current are reduced by 63.3%,34.4%,51%and 59.2%,respectively,and the current harmonics of segmented APMSM can be reduced greatly,the tracking accuracy of the large aperture telescope can be improved.