Patent ID: 7230398
Filing Date: 2007-06-12
Classification: G01P,H02P

Abstract:
1. A brushless motor control apparatus of a brushless motor which comprises a permanent magnet type rotor and a stator, and which applies a harmonic voltage to a winding of the stator and measures the position of the rotor from the motor electrical current which is generated by the high frequency voltage, comprising: an electrical current command control device which, in a magnetic pole discrimination procedure which discriminates the orientation of a magnetic pole of the rotor by applying field electrical current flowing in a direction of the magnetic field, varies a field electrical current command value based upon the position of the rotor, wherein the electrical current command control device is structured to select a field electrical current command value according to the rotor angle which specifies the position of the rotor from among a set of field electrical current command values which have been set in advance for each of a set of predetermined angular ranges.