分布参数共模等效电路关键参数确定及轴承电流计算

发布时间：2018-10-31 16:09

【摘要】：针对变频电机轴承电流计算问题,提出了分布参数共模等效电路模型,该模型考虑了电机绕组分布阻抗特性。此外通过解析法及有限元法计算了共模等效电路中关键参数,在此基础上提出了阻抗分离法确定分布参数共模等效电路中的关键寄生参数,该方法综合考虑了电机运行一定周期后绝缘材料性质的变化,使得参数确定更加准确。基于该方法得到了电机内关键寄生参数的频域特性。本文搭建了基于分布参数等效电路的轴承电流仿真模型,利用测得的关键参数,实现了对轴承电流的预测。最后搭建了轴承电流实验平台,测量了轴承电流、轴电压,仿真结果与实验结果基本吻合,证明了本文所提出的分布参数共模等效电路及阻抗分离法确定参数的合理性。
[Abstract]:A common-mode equivalent circuit model with distributed parameters is proposed to calculate the bearing current of variable-frequency motor. The distributed impedance characteristics of motor windings are taken into account in the model. In addition, the key parameters in the common-mode equivalent circuit are calculated by analytical method and finite element method. Based on this, the impedance separation method is proposed to determine the key parasitic parameters in the common-mode equivalent circuit with distributed parameters. This method takes into account the change of insulating material properties after motor running for a certain period, which makes the parameter determination more accurate. Based on this method, the frequency domain characteristics of the key parasitic parameters in the motor are obtained. In this paper, the simulation model of bearing current based on the equivalent circuit of distributed parameters is built, and the prediction of bearing current is realized by using the key parameters measured. Finally, the bearing current experimental platform is built, and the bearing current and shaft voltage are measured. The simulation results are in good agreement with the experimental results, which proves the rationality of the common mode equivalent circuit and the impedance separation method proposed in this paper.
【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;沈阳工业大学教育部特种电机与高压电器省部共建重点实验室;
【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】：TM301

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