【目的】分数槽集中绕组(FSCW)具备高转矩密度、低铜耗的优点,但其丰富的谐波磁场、占比较高的低次谐波会产生转矩脉动,影响电机稳定性。本文以FSCW感应电机为研究对象进行研究。【方法】首先,基于转子初始位置,推导气隙各次谐波磁密表达式,定性分析各次谐波磁密对总转矩的影响,应用麦克斯韦变式计算电机电磁转矩。其次,通过数学解析和有限元仿真,分析了转子初始位置对气隙各次谐波磁密和电机电磁转矩的影响。最后,进行样机堵转试验。【结果】根据理论、仿真和试验验证了FSCW感应电机气隙磁密和电磁转矩理论分析的正确性。【结论】研究发现,电机在不同转子初始位置下启动可以获得不同的电磁转矩。

[Objective] Fractional slot concentrated winding (FSCW) has the advantages of high torque density and low copper consumption, but its rich harmonic magnetic field and high proportion of low-order harmonics can cause torque ripple, affecting motor stability. This study focuses on FSCW induction motors. [Methods] Based on the initial rotor position, the expressions for each harmonic magnetic density in the air gap were deduced; the influence of each harmonic magnetic density on the total torque was qualitatively analyzed; and Maxwell variant was applied to calculate the electromagnetic torque of the motor. Secondly, through mathematical analysis and finite element simulation, the effects of the initial rotor position on the harmonic magnetic flux density in the air gap and the electromagnetic torque of the motor were analyzed. Finally, the prototype locked-rotor test was carried out. [Results] The correctness of the theoretical analysis of the magnetic flux density in the air gap and electromagnetic torque of the FSCW induction motor was verified based on theory, simulation, and experiment. [Conclusion] Starting the motor with different rotor initial positions can result in varying electromagnetic torque.

江苏省配电网智能技术与装备协同创新中心开放基金项目(XTCX202405);江苏省研究生科研与实践创新计划(SJCX23_1194)