频域寄生电容法变频电机Hertz轴承电流密度计算

发布时间：2018-02-26 07:27

本文关键词： 变频电机轴承电流密度寄生电容 Hertz模型　出处：《电工技术学报》2015年02期 　论文类型：期刊论文

【摘要】：提出应用频域寄生电容法计算Hertz轴承电流密度。该种方法以电机系统内的寄生电容为研究对象,通过解析法确定其频域特性,结合电机内耦合电容拓扑结构计算轴承电流。本文以一台3k W变频电机为研究对象,通过解析法确定其各部分寄生电容的频域特性,并通过阻抗分析仪对计算结果进行校验。根据变频器电机系统耦合电容模型列写轴承电流线性微分方程,通过一般线性扩展法对其进行求解,求得轴承放电电流。搭建轴承电流测量平台,对轴承电流进行测量,与计算结果基本吻合。最后应用接触力学中的经典Hertz理论求得轴承接触面积,进而计算轴承电流密度。该种轴承电流密度计算方法为定量评估轴承电损伤提供了理论依据。
[Abstract]:The frequency domain parasitic capacitance method is used to calculate the current density of Hertz bearing. The parasitic capacitance in the motor system is taken as the research object, and the frequency domain characteristic is determined by the analytical method. In this paper, a 3kW inverter motor is used as the research object, and the frequency domain characteristics of the parasitic capacitance of each part of the motor are determined by analytical method. According to the coupling capacitance model of inverter motor system, the linear differential equation of bearing current is written, and the general linear expansion method is used to solve the equation. The bearing discharge current is obtained. The bearing current measurement platform is built to measure the bearing current, which is in good agreement with the calculated results. Finally, the contact area of the bearing is obtained by applying the classical Hertz theory in contact mechanics. The method provides a theoretical basis for the quantitative evaluation of bearing electrical damage.
【作者单位】：沈阳工业大学现代电工装备理论与共性技术重点实验室;
【基金】：国家自然科学基金项目(51277122) 教育部创新团队项目(IRT1072) 教育部博士点基金(20122102130001)
【分类号】：TM344.6

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