Patent ID: 7400105
Filing Date: 2008-07-15
Classification: H02P

Abstract:
1. A motor drive device comprising: a motor drive unit that drives a brushless DC motor, the brushless DC motor comprising a rotor; a controller that produces a motor driving signal to drive the brushless DC motor; and a rotational detector that detects a rotational state of the brushless DC motor to produce a rotational state signal, wherein the controller receives the rotational state signal from the rotational detector, wherein the controller has a phase switcher that determines a phase-switching timing to switch a phase of the brushless DC motor based on the rotational state signal, the phase switcher being a separate unit from the motor drive unit, wherein the controller transmits the phase-switching timing as the motor driving signal to the motor drive unit, and wherein the controller is affixed to a circuit board that is different from another circuit board to which the motor drive unit is affixed.