PWM技术对双绞线击穿的影响

2017 3rd International Conference on Condition Assessment Techniques in Electrical Systems (CATCON) Pub Date : 2017-11-01 DOI:10.1109/CATCON.2017.8280258

S. N. Rao, K. Elanseralathan

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引用次数: 2

摘要

在工业应用中，为了获得可调速度，变频器驱动电机的定子绕组经常观察到过早绝缘失效。由于IGBT的高开关频率，使用PWM技术的电力电子变换器产生的脉冲波形具有非常短的上升和下降时间。这种电机绕组绝缘的寿命是用漆包线制备的双绞线样品来测试的。本工作采用40微米厚度的改性聚酯(非耐电晕材料)搪瓷涂层。击穿试验通过施加高频高压应力的PWM和PWM峰值波形的不同频率电平，高达30 kHz。测试结果表明，PWM峰值波形的绝缘失效要比PWM波形早得多。

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Influence of PWM technique on breakdown in twisted pairs

Premature insulation failure is frequently observed in the stator winding of electrical motors fed by inverter drives in industrial applications for obtaining adjustable speeds. The Power Electronic Converters using PWM technique produces pulsed waveforms having a very short rise and fall times due to the high switching frequency of IGBT's. The life of such motor winding insulation is tested using twisted pair samples prepared using enameled wires. The enamel coating of Modified Polyester (non-corona resistant material) of 40 microns thickness is used for this work. The breakdown tests were performed by applying a high frequency high voltage stress of PWM and PWM-peak waveforms with different frequency levels up to 30 kHz. The test results show that the insulation fails much earlier for PWM-peak waveform than the PWM waveform.

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2017 3rd International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)

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