Patent ID: 7876013

Claim:
A brushless motor of step-skew structure, comprising: rotor cores dividedly formed as plural sections in an axial direction; a plurality of segment magnets secured to outer circumferential surfaces of the rotor cores; magnet holders secured to the rotor cores and each having holder arms holding the segment magnet on the outer circumferential surface of the rotor core; and each of the rotor cores being displaced from one another by a step angle in a circumferential direction; wherein each of the rotor cores has holder-positioning parts and core side joint parts, the holder-positioning parts being made in an outer circumferential surface of the rotor core and configured to hold the holder arms, and the core side joint parts having a prescribed positional relation with the holder-positioning parts, and each of the magnet holders has holder side joint parts fitted in the core side joint parts and arranged in a prescribed positional relation with the holder arms.