Operating speed refers to the actual rotational speed of the pump (or motor) at the time of operation. The rated speed is the maximum speed at the rated pressure, which can operate continuously for a long time.
If the pump exceeds the rated speed of work will result in insufficient oil absorption, produce vibration and large noise, parts will suffer from cavitation damage, life loss. The minimum steady speed is the minimum allowable speed for the motor to operate normally. At this speed, the motor does not appear crawling phenomenon.