Patent ID: 7411365
Filing Date: 2008-08-12
Classification: H02P

Abstract:
1. A drive control device of motor in which such a current that a rotor of a polyphase direct-current motor does not react is passed through any two phase coils of the polyphase direct-current motor in succession, a polarity of voltage induced in a non-conducting phase is detected, a phase coil of the polyphase direct-current motor through which a current should be passed to rotate the rotor and the direction of energization are determined, and a current is passed in accordance with the determination to rotate and start up the rotor, wherein, when the phase coil through which a current should be passed and the direction of energization are determined based on results of detection of induced voltages in respective phases of the polyphase direct-current motor, a value equivalent to average value of induced voltages in all phases of the polyphase direct-current motor is determined, and a polarity of induced voltage in each phase of the polyphase direct-current motor is determined with the value equivalent to the average value taken as a threshold value.