| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotational speed control device for a motor-driven pump for forming the pump excellent in pump performance and for preventing the pump from being overloaded, by taking out just enough motor power over a whole region in the vicinity of from a cutoff to delivery. SOLUTION: A device comprises a detection part 2 detecting a current value or input value connected to a system of a pump motor 1, control circuit part 3 constituted so as to generate a frequency or voltage increase command in the case of judging of a detection value by the detection part 2 lower than a reference value and a frequency or voltage decrease command in the case of judging of a detection value higher than the reference value and an output part outputting a frequency or voltage, commanded from the control circuit part 3, supplying it to the pump motor 1. |
