Direct-driven PMSG works at low speed and its size is generally big.
2
一旦电机达到接近设计运行转速,离心开关开始动作,关断启动绕组与电网之间的连接。
Once the motor reaches near design operating speed, the centrifugal switch activates, opening the contacts and disconnecting the startup winding from the power source.
3
改进后大大缩短了轴的长度,使轴的临界转速远在运行转速之上,泵由两个密封改为一个密封。
The modification resulted in a much shorter shaft with a critical speed well above the running speed, and a pump with only one instead of two seals.