| 摘要 |
PROBLEM TO BE SOLVED: To always fully effectively utilize a motor in a wide range of a region extending from a small discharge amount area of a high lift to a large discharge amount area of a low lift. SOLUTION: This control device comprises a number of revolutions control part 3 to control the number of revolutions of a pump motor 4 by an output signal from a switch selection part 7; a power detecting part 9A to detect a power value of a pump motor 4; a motor current detecting part 9B to detect a value of a current flowing to the pump motor 4; a power setting part 8A to set a target power value; a motor current set part 8B to set an upper limit current set part 8B; a power comparing part 10A to output a number of revolutions decrease command when a detecting power value is higher than a set power value and a number of revolutions increase command when the detecting power value is lower; a motor power comparing part 10B to output a numer of revolutions reduction command only when the detecting current value is higher than a set current value; and a switch selection part 7 to input and select the number of revolutions command and output a switch signal. |
