北京交通大学学报2025，Vol.49Issue(3)：130-136,7.DOI:10.11860/j.issn.1673-0291.20240069
交流电机杂散电容直接法测试的稳定性分析及改进
Stability analysis and improvement of direct measurement method for stray capacitance in AC motors
摘要
Abstract
In the modeling of bearing currents in variable-frequency AC motors,the direct measure-ment of stray capacitance often yields unstable results due to fluctuations in terminal capacitance data.To address this issue,this paper proposes a short-circuit method for measuring stray capacitance.First,the generation mechanism of bearing currents in variable-frequency drive systems is analyzed,along with a description of the lumped-parameter bearing current model and the associated stray capaci-tance parameters.Second,the direct measurement method is employed to determine motor stray ca-pacitance,and the impact of terminal capacitance fluctuations on the stability of both the measured ca-pacitance and its derivative are assessed.Finally,the short-circuit method is introduced for extracting stray capacitance,on which the influence of terminal capacitance fluctuations is examined.Experimen-tal results indicate that in the direct measurement method,terminal capacitance fluctuations signifi-cantly impair the stability of the measured stray capacitance and its derivative,resulting in discontinui-ties and high variability of stray capacitance.In contrast,the short-circuit method yields stray capaci-tance values and derivatives that are unaffected by sensitivity intervals and show no data fluctuations.These findings demonstrate that the short-circuit method is more suitable for measurement of stray ca-pacitance in AC motors.关键词
交流电机/杂散电容/轴电压/轴电流/直接法/短接法Key words
variable-frequency drive/stray capacitance/bearing voltage/bearing current/direct mea-surement method/short-circuit method分类
信息技术与安全科学引用本文复制引用
程远辉,刘瑞芳,张添赫,李知浩,陈立珂,钟辉,许克朋..交流电机杂散电容直接法测试的稳定性分析及改进[J].北京交通大学学报,2025,49(3):130-136,7.基金项目
国家自然科学基金(51777008) （51777008）
北京市自然科学基金(3222055)National Natural Science Foundation of China(51777008) （3222055）
Beijing Municipal Natural Science Foundation(3222055) （3222055）
