考虑温升梯度影响的表贴式高速永磁电机转子强度分析

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (1) : 187-195.

论文

陈亮亮1，2，冯惊鸿2，熊茹3，祝长生4，伍家驹2，李志农1

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Rotor strength analysis of surface-mounted high-speed permanent magnet motor considering effects of temperature rise gradient

CHEN Liangliang1,2, FENG Jinghong2, XIONG Ru3, ZHU Changsheng4, WU Jiaju2, LI Zhinong1

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摘要

针对非导磁金属护套表贴式高速永磁电机的转子强度分析问题，基于弹性力学的平面应力模型，采用极坐标下的位移法，推导了考虑静态过盈量、转速以及转子温升梯度影响的转子强度解析解，并通过有限元仿真和实验验证了解析解的有效性。在转子强度解析解的基础上，进一步研究了护套厚度、静态过盈量、转速及转子温度等参数对转子应力的影响。仿真及实验结果表明：解析解能够准确计算考虑温升梯度影响的表贴式高速永磁电机转子的径向应力、环向应力及等效Mises应力。高速离心力和转子发热使永磁体内的拉应力大幅增加，同时也增加了护套所承受的Mises等效应力。适当增加静态过盈量和护套厚度可增强永磁体内的预压力，使永磁体免受高速离心力及转子发热产生的拉应力所破坏。

Abstract

As for the problem of rotor strength analysis of the surface-mounted high speed permanent magnet machine with a non-magnetic alloy sleeve, the analytical solution of rotor strength was proposed based on the plane stress model of elastic mechanics. The displacement method in polar coordinate was employed to deduce the analytical solution, and the influences of the static interference fit, rotational speed and temperature gradient of rotor were taken into account in the analytical solution proposed. Then the effectiveness of the analytical solution was validated by finite element simulations and experiments, respectively. Finally, the influences of design parameters including sleeve thickness, static interference fit, rotational speed and rotor temperature on rotor stress were further investigated based on the analytical solution proposed. The simulations and experiments show that the analytical solution proposed can accurately calculate the radial stress, hoop stress and equivalent Mises stress of the rotor of surface-mounted high speed permanent magnet machine, considering the influence of temperature gradient. High speed centrifugal force and rotor heating result in significant increasing of the tensile stress in permanent magnets, meanwhile, the equivalent Mises stress of non-magnetic alloy sleeve also increases. The pre-pressure of the permanent magnet can be improved by appropriately increasing the static interference fit and sleeve thickness, so as to protect permanent magnets from the tensile stress produced by high speed centrifugal force and rotor heating.

导出引用

陈亮亮1，2，冯惊鸿2，熊茹3，祝长生4，伍家驹2，李志农1. 考虑温升梯度影响的表贴式高速永磁电机转子强度分析[J]. 振动与冲击, 2022, 41(1): 187-195

CHEN Liangliang1,2, FENG Jinghong2, XIONG Ru3, ZHU Changsheng4, WU Jiaju2, LI Zhinong1. Rotor strength analysis of surface-mounted high-speed permanent magnet motor considering effects of temperature rise gradient[J]. Journal of Vibration and Shock, 2022, 41(1): 187-195

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