基于电磁场数值计算的变频供电感应电机耦合电容与轴电压的分析

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Abstract The common mode voltage of PWM inverter drive system will induce bearing voltage and bearing current in the motor under the influence of the coupled capacitance of the motor. Accurate calculation of the coupled capacitance of the motor is important to forecast the bearing voltage. After analyzing the common mode circuit model of the system, the 2D and 3D finite element models of the motor are established respectively. The results show that the end part of winding is a key factor to the stator winding to rotor capacitance C_wr. The calculation considering the end part of winding in 3D analysis is more accurate than which in 2D analysis. It is concluded that the length of extended straight part of stator winding and the thickness of squirrel-cage ring in axial direction are two main factors which can affect C_wr. The 3D transient electric field finite element calculation is applied on an induction motor fed by inverter. The result shows that bearing voltage mirrors the common mode voltage, which verifies the effectiveness of the analysis model.

Key words： PWM inverter coupled capacitance winding-end bearing voltage

Received: 10 August 2014 Published: 08 September 2015

PACS:

TM315

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	Liu Ruifang
	Li Junfeng
	Sang Bingqian
	Cao Junci

Cite this article:

Liu Ruifang,Li Junfeng,Sang Bingqian等. Modeling of Coupled Capacitances and Bearing Voltage in Induction Motors Fed by Inverters Based on Numerical Calculation of Electromagnetic Field[J]. Transactions of China Electrotechnical Society, 2015, 30(14): 161-169.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2015/V30/I14/161

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