Patent ID: 7518332
Filing Date: 2009-04-14
Classification: H02K,H02P

Abstract:
1. A driving control apparatus for a brushless synchronous motor comprising: a rotor shaped in a non-circular profile and having salient magnets arranged in a circumferential direction, a stator having driving magnetic poles arranged in the circumferential direction, and an exciting coil wound around each of said magnetic poles, said control apparatus operable to detect a magnetic pole direction of said rotor, switch on/off a current supplied to said exciting coil and determine a direction in which the current flows at a proper rotational angular timing, to control the rotation of said rotor, said driving control apparatus comprising: a detector circuit connected to at least one of said exciting coils for generating a detection signal indicative of an impedance of said exciting coil in accordance with the distance between said driving magnetic poles and said rotor.