大功率变频电机轴承油膜EDM击穿概率建模

doi:10.3901/JME.2025.17.137

机械工程学报 ›› 2025, Vol. 61 ›› Issue (17): 137-149.doi: 10.3901/JME.2025.17.137

• 机械动力学 • 上一篇

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大功率变频电机轴承油膜EDM击穿概率建模

李学军¹, 廖海泽¹, 唐虎娇², 周献文¹

1. 佛山大学机械工业转子振动监测及诊断技术重点实验室佛山 528000;
2. 瓦房店轴承集团有限责任公司国家大型轴承工程技术研究中心瓦房店 116300

收稿日期:2024-09-26 修回日期:2024-12-16 发布日期:2025-10-24
作者简介:李学军，男，1969年出生，教授，博士研究生导师。主要研究方向为机械动力学与故障诊断、高端装备健康管理与智能维护。E-mail：hnkjdxlxj@163.com;周献文(通信作者)，男，1986年出生，博士，硕士研究生导师。主要研究方向为转子动力学与振动控制、先进传感测试技术等。E-mail：zxwen@fosu.edu.cn
基金资助:
广东省基础与应用基础研究基金(2023A1515140029)、季华实验室科研(X220941UZ230)和国家重点研发计划(2020YFB2007800)资助项目。

Modeling the Probability of Oil Film EDM Breakdown in High Power Inverter Motor Bearings

LI Xuejun¹, LIAO Haize¹, TANG Hujiao², ZHOU Xianwen¹

1. Key Laboratory of Rotor Vibration Monitoring and Diagnosis Technology for Mechanical Industry, Foshan University, Foshan 528000;
2. National Engineering Research Center for Bearing, Wafangdian Bearing Group Co., Ltd., Wafangdian 116300

Received:2024-09-26 Revised:2024-12-16 Published:2025-10-24

摘要/Abstract

摘要： 随着脉宽调制技术的广泛应用以及变频电机母线电压的快速提高，风力发电机、轨道交通牵引电机等领域大功率变频电机中轴电流损伤已成为其轴承失效的主导因素。针对大功率变频电机轴承轴电流微损伤概率评估问题，考虑了轴承滚道微观粗糙度的影响，提出了油膜分压及耐压计算方法，构建了变频电机轴承油膜EDM击穿概率模型，并对190 kW牵引电机非驱动端轴承油膜击穿概率和轴电流密度解析计算，建模结果与轴承实际服役中轴电流损伤相似，验证了模型的有效性和可靠性。研究表明：轴电流损伤通常集中于轴承内圈或外圈赫兹接触区最大受载滚珠处，油膜发生击穿放电的可能性最高，绝缘轴承依靠涂层小电容分压和大电阻阻断特性可分别有效抑制油膜击穿概率及轴电流密度。

关键词: 轴电流损伤, 最小油膜厚度, 击穿概率, 绝缘轴承

Abstract: With the wide application of pulse width modulation technology and the rapid increase of bus voltage of variable frequency motor, the shaft current damage of high power variable frequency motor has become the dominant factor of bearing failure in wind turbine, rail transit traction motor and other fields. Aiming at the problem of evaluating the micro-damage probability of bearing current in high-power variable frequency motor, considering the influence of micro-roughness of bearing raceway, the calculation method of oil film partial pressure and withstand voltage is proposed, and the EDM breakdown probability model of bearing oil film in variable frequency motor is constructed. The oil film breakdown probability and shaft current density of the non-drive end bearing of 190 kW traction motor are calculated analytically. The modeling results are similar to the shaft current damage in the actual service of the bearing, which verifies the validity and reliability of the model. The results show that the shaft current damage is usually concentrated at the maximum load ball in the Hertz contact area of the inner ring or the outer ring of the bearing, and the possibility of breakdown discharge of the oil film is the highest. The insulating bearing can effectively suppress the breakdown probability of the oil film and the shaft current density by relying on the small capacitance partial pressure and large resistance blocking characteristics of the coating.

Key words: shaft current damage, minimum oil film thickness, breakdown probability, insulated bearing

中图分类号:

TH133

李学军, 廖海泽, 唐虎娇, 周献文. 大功率变频电机轴承油膜EDM击穿概率建模[J]. 机械工程学报, 2025, 61(17): 137-149.

LI Xuejun, LIAO Haize, TANG Hujiao, ZHOU Xianwen. Modeling the Probability of Oil Film EDM Breakdown in High Power Inverter Motor Bearings[J]. Journal of Mechanical Engineering, 2025, 61(17): 137-149.

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大功率变频电机轴承油膜EDM击穿概率建模

Modeling the Probability of Oil Film EDM Breakdown in High Power Inverter Motor Bearings

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