低转矩脉动低速大转矩电主轴感应电机的设计与分析

针对低速大转矩电主轴电机转矩脉动偏高的工程实际问题，对电机不同槽配合的性能进行分析综合对比，精确选择出各方面性能较优的电机方案。针对感应电机有限元仿真瞬态场收敛速度慢、在多方案对比时求解周期长的问题，提出时谐场和瞬态场联合仿真的思路，实现电机的快速优化设计。对一台12极7.5 kW的电主轴感应电机在每极每相槽数为3、2.5、2三种不同槽配合的组合下进行二维电磁有限元分析计算，对比其在额定工况下的铁耗、绕组铜耗、转子铝耗、效率、功率因数和转矩脉动等电磁性能。结果表明了转子导条数目的增加，能够使电机电磁性能保持较高水平，特别是能够维持较低的转矩脉动水平。最后对定子槽数90和转子槽数106的槽配合方案进行了样机制作，试验验证了样机的性能，并验证了时谐场和瞬态场联合仿真的准确性。

Design and Analysis of Low Torque Ripple Low Speed High Torque Motorized Spindle Induction Motor

Aiming at the practical engineering problem of high torque ripple of low speed high torque motorized spindle motor, the performance of different slot number combination of the motor is analyzed and compared to accurately select the motor scheme with better performance. The convergence speed of transient field in finite element simulation of induction motor is slow, and a long simulation period is needed when comparing multiple schemes. Aiming at these problems, the joint simulation of time harmonic field and transient field is proposed to realize the rapid optimization design of the motor. Two-dimensional electromagnetic finite element simulation is carried out for a 12-pole, 7.5 kW motorized spindle induction motor with three different slot number combinations of 3, 2.5 and 2 slots per pole per phase, and the electromagnetic properties of the motor under the rated conditions such as iron loss, winding copper loss, rotor aluminum loss, efficiency, power factor and torque ripple are compared. The results show that increasing the number of rotor bars can lead to better electromagnetic performances, especially a low level of torque ripple. Finally, a prototype with 90 stator slots and 106 rotor slots is made, and the performance of the prototype, as well as the accuracy of the joint simulation of time harmonic field and transient field, is verified by experiments.