Patent ID: 8212448

Claim:
A universal motor comprising a stator and a rotor installed in the stator, the stator comprising: a pair of identical stator segments, each segment comprising a yoke having first and second ends, a pole and a neck connecting the pole to the first end of the yoke, each pole having two opposite ends in a circumferential direction of the rotor, the first end of the yoke having a first planar end surface, the second end having a second planar end surface which is oppositely arranged relative to the first planar end surface, the first and second planar end surfaces being inclined relative to an axial plane passing through a center of the pole, one of the first and second planar end surfaces having a groove and the other one having a projecting rib, the projecting rib on each yoke being engaged in the groove of the other yoke, and the first planar end surface of each yoke being in contiguous contact with the second planar end surface of the other yoke; and a pair of pre-formed windings mounted on respective poles of the stator segments.