Patent ID: 7569961

Claim:
A rotor for motors comprising: a rotor core disposed on a rotary shaft, a first divided rotor magnetic pole unit including P, wherein P is a positive even number, first permanent magnet magnetic pole portions and P, wherein P is the positive even number, salient pole portions made of a magnetic material; the first permanent magnet magnetic pole portions and the salient pole portions being alternately disposed on a surface of the rotor core in a circumferential direction of the rotary shaft, and a second divided rotor magnetic pole unit including P, wherein P is the positive even number, second permanent magnet magnetic pole portions disposed adjacent to each other on the surface of the rotor core in the circumferential direction of the rotary shaft, the first divided rotor magnetic pole unit and the second divided rotor magnetic pole unit being disposed side by side in an axial direction of the rotary shaft so that a first virtual centerline extending along an axis line of the rotary shaft and passing through the center of the first permanent magnet magnetic pole portion capable to coincide with a second virtual centerline extending along the axis line and passing through the center of the second permanent magnet magnetic pole portion wherein a gap is formed due to size precision of the permanent magnet magnetic pole portion, between two adjacent permanent magnet magnetic pole portions of the P the second permanent magnet magnetic pole portions in the second divided rotor magnetic pole unit; and a spacer made of a soft magnetic material is disposed in the gap.