单极性脉冲宽度对散绕电机定子绝缘PDIV影响研究  

Effect of unipolar pulse width on PDIV of stator insulation in random wound motors

作　　者：陈峻升 刘国栋 王鹏[1] 程驰宙 吴冬桃 朱英伟[1] CHEN Junsheng;LIU Guodong;WANG Peng;CHENG Chizhou;WU Dongtao;ZHU Yingwei(College of Electrical Engineering,Sichuan University,Chengdu 610065,China;Shanghai Ideal Automotive Technology Co.,Ltd.,Shanghai 201805,China)

机构地区：[1]四川大学电气工程学院,四川成都610065 [2]上海理想汽车科技有限公司,上海201805

出　　处：《绝缘材料》2024年第11期73-78,共6页Insulating Materials

摘　　要：局部放电起始电压(PDIV)检测是评估散绕变频电机定子绝缘性能的重要测试方法。作为脉宽调制电压的重要参数,脉冲宽度对散绕变频电机匝间绝缘和相间绝缘PDIV的影响值得关注。本文在频率为50 Hz、上升时间为75 ns、0.5~20μs脉冲宽度范围内,研究了不同脉冲宽度下电机匝间绝缘与相间绝缘PDIV的分布规律。结果表明:单极性脉冲方波输入散绕变频电机进行PDIV测试时,随着输入脉冲宽度增大,PDIV总体呈下降趋势;由于受到短脉冲上升沿与下降沿处过电压的联合作用,PDIV在脉冲宽度为4μs时出现拐点;在单极性脉冲下进行散绕变频电机的匝间与相间PDIV测试时,需要同时考虑脉冲宽度和过电压的影响,取适当宽度的脉冲以得到定子绝缘PDIV的保守值。Partial discharge inception voltage(PDIV)detection is an essential test method for evaluating the insulation performance of random wound inverter-fed motor stators.As an important parameter of pulse-width modulation voltage,the effects of pulse width on the PDIV of interturn insulation and interphase insulation in random wound inverter-fed motors are noteworthy.In this paper,the PDIV distribution laws of interturn insulation and interphase insulation in motor under different pulse widths were studied in the frequency of 50 Hz,rise time of 75 ns,and pulse widths within of 0.5−20μs.The results show that when unipolar pulse square waves are input into random wound inverter-fed motors for PDIV testing,the overall trend of PDIV decreases as the input pulse width increases.Due to the combined effect of overvoltage from the rising and falling edges of short pulses,a turning point occurs in PDIV at a pulse width of 4μs.It is necessary to consider the effects of pulse width and overvoltage and select appropriate pulse widths to obtain conservative values of stator insulation PDIV when conducting the PDIV test of interturn insulation and interphase insulation in random wound inverterfed motor under unipolar pulse.

关 键 词：变频电机 绝缘系统 局部放电 局部放电起始电压 

分 类 号：TM344.6[电气工程—电机] TM855