Patent ID: 9007006
Filing Date: 2015-04-14
Classification: F04B

Abstract:
1. A pump control device configured to control pump in a pump system, the pump control device comprising: an AC (alternating current) electric motor configured to drive the pump; a converter configured to receive an AC power from an outer source and convert the AC power into a DC (direct current) voltage; a smoothing unit connected to the converter and configured to smooth the DC voltage; an inverter connected to the smoothing device and configured to a volt/hertz pulse width-modulation controller connected to the inverter and configured to control the three-phase AC voltage supplied to the AC electric motor by applying a switching voltage to a semiconductor switching device of the inverter; and a main controller operatively connected to the volt/hertz pulse width-modulation controller, wherein, while the AC electric motor is driving the pump, the main controller is configured to