Patent ID: 9217438
Filing Date: 2015-12-22
Classification: F04D,H02P

Abstract:
1. A pump control device for use with a pump device having a DC brushless motor as a drive source wherein a flow rate of the pump device is increased and decreased depending on a corresponding increase and decrease of a rotational speed of the DC brushless motor, the pump control device comprising: a motor drive section which drives the DC brushless motor; a comparison section which compares a level of a speed control signal for the DC brushless motor with a predetermined reference value; a feedback control signal output section into which a detection signal of an actual rotating speed of the DC brushless motor and the speed control signal are inputted and which outputs a feedback control signal for coinciding the actual rotating speed with a target rotational speed of the DC brushless motor that is calculated based on the speed control signal; and a switching section which outputs one of the speed control signal and the feedback control signal to the motor drive section on a basis of a comparison result in the comparison section; wherein in a case that the rotational speed of the DC brushless motor is higher than a predetermined speed, the level of the speed control signal for the DC brushless motor is inputted as a higher value than the predetermined reference value, wherein when the level of the speed control signal is higher than the predetermined reference value, the DC brushless motor is controlled in an open loop control, and when the level of the speed control signal is lower than the predetermined reference value, the DC brushless motor is controlled in a closed loop control on a basis of a measurement result of the actual rotating speed.