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1973年起我省先后在一些水文站安装了 JZT 型电磁调速异步电动机,用于水文缆道绞车的无级调速。对于调速性能要求不高的水文缆道绞车,在解决好转动惯量这一问题之后可以说是一种比较适用的无级调速装置。JZT 型电磁调速异步电动机的转差离合器的电枢为一实心钢环,它和鼠笼电动机以同一速度转动,其转动惯量是普遍电机的3倍,再加上励磁绕组本身有一个较大的电感时间常数,所以在换向时或停车之后,电机转子长期不能停下。如马上按反转按钮,相当于先对其反接制动,后再反转,这时制动电流很大,超过电机额定电流的2～3倍,经常发生过电流现象烧毁熔断器。要是经常使用反接制动,则定子发热严重,容易损坏电机。如等惯性停止再起动,换向时间
Since 1973, our province has installed JZT-type electromagnetic speed-regulated induction motors at some hydrological stations for stepless speed regulation of hydrographic cable winches. The hydrologic cable winch, which is not required for speed regulation performance, can be said to be a more suitable stepless speed regulation device after solving the problem of moment of inertia. JZT electromagnetic speed control asynchronous motor slip clutch armature is a solid steel ring, which squirrel-cage motor with the same speed rotation, the moment of inertia is 3 times the general motor, plus the excitation winding itself has a larger Of the inductance time constant, so in the commutation or after stopping, the motor rotor can not stop for a long time. Such as immediately press the reverse button, the equivalent of the first reverse brake, and then reverse, then the brake current is large, more than 2 ~ 3 times the rated current of the motor, frequent over-current phenomenon burned fuse. If you often use reverse braking, the stator heat serious, easy to damage the motor. If the inertia stop and then restart, change the time