Patent ID: 8975843
Filing Date: 2015-03-10
Classification: F04B,H02P

Abstract:
1. A motor control device, comprising: a control condition storage unit storing at least one of a control condition defined by an equivalent voltage supplied to a three-phase motor and a control condition defined by relationship between the equivalent voltage supplied to the three-phase motor and a frequency of PWM signal; a control condition extracting unit extracting the control condition from the control condition storage unit in response to a temperature of a viscous fluid supplied by a pump having the three-phase motor as a power source; a PWM controlling unit controlling a switching element included in an inverter circuit based on a PWM signal related to the extracted control condition when the three-phase motor is started; and wherein the control condition is defined such that the equivalent voltage becomes lower as the temperature of the viscous fluid is higher, the equivalent voltage being defined by a voltage and a duty ratio of the PWM signal, the voltage corresponding to a pulse amplitude of the PWM signal.