[关键词]
[摘要]
超高速永磁同步电机(PMSM)转速较高,永磁体抗拉强度相对较小,需要在转子永磁体外设置护套并通过过盈配合使永磁体上产生径向压应力,抵消转子高速旋转时所产生的离心力,对永磁体进行保护。提出了一种超高速PMSM转子不导磁合金护套厚度及过盈量计算分析方法。以1台120 000 r/min超高速PMSM为例,运用有限元法进行温度场及转子静力学耦合仿真分析,对数值法进行验证,并通过优化设计,使电机转子在满足结构强度要求的情况下,合理计算护套的厚度及过盈量,有效降低转子护套的厚度,从而减小转子铁耗,为超高速电机转子设计提供参考。
[Key word]
[Abstract]
The ultra-high-speed permanent magnet synchronous motor (PMSM) has the characteristics of high speed and relatively low tensile strength of permanent magnets. Therefore, it is necessary to set a sleeve on the outside of the permanent magnet of the rotor,and generate radial compressive stress on the permanent magnet through interference fit, so as to offset the centrifugal force generated during the rotor high-speed rotation and protect the permanent magnet. A method for calculating and analyzing the thickness and interference of rotor non-magnetic alloy sleeve of the ultrahighspeed PMSM is proposed. Taking a 120 000 r/min ultra-high-speed PMSM as an example, the coupling simulation of temperature field and rotor statics is carried out by using finite element method, and the numerical method is verified. The optimized design is utilized to reasonably calculate the thickness and interference amount of the sleeve under the condition that the motor rotor meets the requirements of structural strength. It can effectively reduce the thickness of rotor sleeve, thus reducing the iron consumption of rotor,which provides a reference for rotor design of ultra-high-speed motor.
[中图分类号]
[基金项目]
广东省重点领域研发计划项目(2019B090909002)