基于表贴式永磁电机定子拓扑的内嵌永磁伺服电机的设计

Design on the Interior Permanent Magnet Servo Motor Based on Stator Topology of the Surface-mounted Permanent Magnet Motor

在永磁伺服电机产品开发过程中,发现内嵌电机不宜直接采用原有表贴电机的定子侧结构,而应重新进行整体优化设计。逐一分析了表贴电机的定子齿宽、槽深、槽口宽和转子磁钢边缘削减厚度对电磁转矩和转矩脉动影响。有限元计算表明,通过调整定子结构参数、增大定子内径和转子外径、重新分配电机电磁负荷和采用MTPA(最大转距电流比)控制策略,伺服电机轴向长度缩短了8.6%,体积显著减小,功率密度显著提高。

It is found that the interior permanent magnet motor is not able to directly adapt the stator side structure of original surface-mounted permanent magnet motor,but its overall and optimized design has to be restarted in the development process of permanent magnet servo motor products.Influence on electromagnetic torque and torque ripple by the stator tooth width,slot depth,slot width and reduction of the rotor magnet edge thickness is analyzed item by item.By means that the electromagnetic load of the motor is re-distributed by regulating the stator structural parameters,increasing stator inner diameter and rotor outer diameter,as well as adapting MTPA(Maximum Torque Per Ampere)control strategy onto the motor,the FEA calculation result shows the motor axial length is shortened 8.6%,making motor volume less and power density larger signifi-cantly.