摘要
使用IGBT PWM逆变器供电时,逆变器和电动机之间阻抗不匹配和高频开关而引起的高电压上升率(dv/dt)会造成定子绕组绝缘击穿和电压分布不均匀。本文研究了IGBT PWM逆变器驱动的异步电动机定子绕组中电压分布。为了分析定子绕组的不均匀电压,使用有限元法(FEM)计算高频参数。从这些参数得到了由分布电容、电感和电阻构成的等效电路。然后使用该等效电路仿真以预测线匝和线圈中的电压分布。还介绍了逆变器上升时间和电缆长度变化对电压分布的影响。为了试验,制造了一台带有一相分接头的37kW异步电动机和开关浪涌发生器来分析电压分布。
IGBT PWM inverter has been concerned that insulation breakdown and irregular voltage distribution on stator winding dueto high rate of voltage rise(dv/dt)caused by high-frequency switching and impedance mismatch between inverter and motor.In this paper, voltage distribution in stator windings of induction motor driven by IGBT PWM inverter is studied. To analyze theirregular voltage of stator winding, high frequency parameter is computed by using finite element method(FEM).An equivalent circuitcomposed by distributed capacitances, inductance, and resistance is derived from these parameters. This equivalent circuit is then used forsimulation in order to predict the voltage distribution among the turns and coils. The variable effect on rising time of the inverter and cablelength on the voltage distribution is also presented. In order to experiment, an induction motor, 50 HP, with taps from one phase and aswitching surge generator were built to consider the voltage distribution.
出处
《变流技术与电力牵引》
2004年第4期8-12,共5页
Converter Technology & Electric Traction
