公开(公告)号：US4330740A

公开(公告)日：1982-05-18

申请号：US79852

申请日：1979-09-28

申请人： Lewis R. Shell ,  Joseph E. Vandevier

发明人： Lewis R. Shell ,  Joseph E. Vandevier

IPC分类号： H02P1/28 ,  H02P1/26

CPC分类号： H02P1/28

摘要： Low voltage starting of a three-phase submersible pump motor in a shallow well is achieved by employing a high-impedance transformer for supplying the three-phase power to the motor. Upon starting, the normally heavy current drawn by the motor results in a voltage drop through the high-impedance transformer sufficient to substantially lower the voltage across the motor and hence the starting current. In the absence of limiting the starting current, abnormally high starting torques will be produced on the motor shaft resulting in mechanical fatigue and eventually shaft breakage.

摘要翻译： 通过采用高阻抗变压器将三相电力供应给电动机，可以实现浅井中三相潜水泵电动机的低压起动。 起动时，由电动机引起的通常的大电流导致通过高阻抗变压器的电压降足以大大降低电动机两端的电压，从而使启动电流下降。 在不限制起动电流的情况下，马达轴上产生异常高的起动转矩，导致机械疲劳并最终导致轴断裂。