1769-IA8I
力矩电机在接线之前,还应检查步进力矩电机的绝缘,好在接线之前完成对力矩电机的单体调试检查,当力矩电机符合现行规范要求时,再接外部线。一般低压力矩电机的绝缘电阻要求大于0.5MΩ,摇表使用500V。
但是,力矩电机的励磁绕组和电枢绕组如果相互间接反,就可能使力矩电机电枢带电时,励磁绕组不带电而失磁,使力矩电机空载时可能飞车,重载时烧坏转子。因此,力矩电机的电枢绕组和励磁绕组的外部接线不可相互间接错。
力矩电机的外接线。力矩电机接外部电线之前,应先检查端盖内的各个绕组引出端是否有松动现象,当内部引出线的压接螺丝上紧之后,才能按要求的接线方法连结短路片,并压接外部线。
力矩电机在试运转时,要监视力矩电机的电流是否超过规定值,并作记录。另外,还应检查下列项目:
(1)力矩电机的旋转方向是否符合要求。交流力矩电机反向时,任意交换两根力矩电机接线即可;力矩电机反向时,可以交换两根电枢电压接线,也可改变两根励磁电压接线。
(2)力矩电机运行的声音符合要求,即无摩擦声、尖叫声、卡碰声及其他不正常的声音,否则应停机检查。
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