异频电流激励下发电机定子铁芯损耗试验实测分析

Experimental Analysis of Stator Core Loss under Different Frequency Current Excitation

对于大容量电机的定子铁芯损耗试验,采用高频激励代替工频激励可有效降低试验难度,提高试验安全性。为探究在异频电流激励下电机定子铁芯表面及短路故障点的温升趋势,本文以一台电动机为例,制造定子铁芯短路故障点,开展了工频50Hz到高频300Hz下电机的定子铁芯损耗试验。研究结果表明,在高频电流激励下,铁芯表面温度及故障点温度的上升趋势具有较好的一致性,增加电源频率可使系统消耗的无功降低,功率因数升高。

For the loss test of stator core of large capacity motor,using high frequency excitation instead of power frequency excitation can effectively reduce the test difficulty and improve the test safety.In order to explore the temperature rise trend of the stator core surface and the short-circuit fault point under different frequency current excitation,this paper takes a motor as an example to manufacture the short-circuit fault point of the stator core,and carries out the stator core loss test under the power frequency of 50Hz to high frequency of 300Hz.The results show that the rising trend of core surface temperature and fault point temperature is consistent under high frequency current excitation,and the reactive power consumption of the system decreases and the power factor increases with increasing power frequency.