Patent ID: 7355312

Claim:
A brushless motor comprising: a stator having teeth which has S slots; a rotor having a rotor magnet which has P poles; and an induction voltage adjusting portion arranged to adjust an induction voltage of each phase of the stator to a waveform on which an N-order harmonic is superposed; wherein S:Pâ‰ N:2n (n is a positive integer), S/Pâ‰ 1 and S/P>3/4, and a number of phases of the brushless motor is K which is an integer satisfying Kâ‰§2, whereby the N-order harmonic is superposed on the induction voltage of each phase of the stator, where N indicates order of harmonic and has an odd number satisfying Nâ‰§3, and a basic waveform of motor current of each phase of the stator is a sine waveform.