Patent ID: 8362726
Filing Date: 2013-01-29
Classification: H02P

Abstract:
1. A motor controller having a driving control unit of a brushless motor that includes a rotor having magnetic pole position detecting magnets attached thereto and a predetermined number of poles, a stator having multiple phase exciting windings, and position detecting units provided in correspondence to individual phases of the stator for detecting magnetic poles of the magnetic pole position detecting magnets and for outputting detection signals with logic levels corresponding to polarities of the magnetic poles, wherein the driving control unit is connected to output signal lines of the position detecting units of the brushless motor, successively receives output patterns based on the detection signals from the position detecting units via the output signal lines, and rotates the rotor by switching current supply to exciting windings of the individual phases of the stator in response to exciting patterns corresponding to the output patterns, the motor controller comprising: a pattern checking unit for deciding that there is a shift of the rotor from a target position and a counterrotation of the rotor involved with the shift, if an output pattern based on a signal with a prescribed logic level corresponding to a short circuit to or disconnection from ground potential of at least one of the output signal lines is received, and if the output patterns based on the detection signals received before and after the output pattern are found to have different patterns by comparison.