基于ANSOFT的永磁同步伺服电机齿槽转矩分析

Cogging Torque Analysis of Permanent Magnet Synchronous Motor Based on ANSOFT

齿槽转矩是永磁电机的固有属性,引起电机的转矩波动,产生振动和噪声.为减小齿槽转矩,提高永磁伺服电机的控制精度,在研究永磁电机齿槽转矩产生机理的基础上,根据永磁电机齿槽转矩的解析式,研究定子齿部开辅助槽和转子磁极偏移对永磁电机齿槽转矩的影响;利用有限元软件ANSOFT,建立36槽8极永磁伺服电机的有限元分析模型,计算不同尺寸辅助槽和磁极偏心距离时的齿槽转矩,分析辅助槽尺寸和磁极偏心距离对齿槽转矩的影响.研究结果表明,合理的辅助槽尺寸和磁极偏心距离可有效削弱永磁伺服电机的齿槽转矩.

Cogging torque could cause the motor＇s torque ripple occurred , and lead to mechanical vibration and acoustic noise .In order to weaken the PMSM＇s cogging torque and improved control precision , this paper based on the study of cogging torque＇s generating mechanism , according to the analysis formula of cogging torque , the impact of assist slot and PM eccentric distance affected the cogging torque was researched .The FEA software ANSOFT was used , the FEA model of 36 slots 8 pole was established , the cogging torque of different assist slot＇s size and PM eccentric distance has been calculated , and the influence of assist slot＇s size and PM eccentric distance to cogging torque were analyzed .The results indicate that a reasonable assist slot size and eccentric distance could help to reduce the PMSM＇s cogging torque .