Patent ID: 8288914

Claim:
An electric motor comprising a stator and a rotor rotatably mounted with respect to the stator, the stator comprising a housing, a frame member, and a plurality of magnets fixed to an inner surface of the housing by the frame member, the magnets being embedded in the frame member, the frame member having a plurality of first grooves formed in an outer peripheral surface, each of the first grooves extending axially from one axial surface of the frame member; the housing having a plurality of first anchors protruding from a radially inner surface, each of the first anchors engaging with a corresponding one of the first grooves to thereby fix the frame member to the housing; wherein the first grooves have an axial length smaller than the axial height of the frame member; and wherein a plurality of second grooves are formed in the outer surface of the frame member; each of the second grooves is axially aligned with and communicating with a corresponding one of the first grooves, each of the second grooves has a radial depth smaller than the radial depth of the corresponding first groove and has a circumferential width smaller than the circumferential width of the corresponding first groove; and a plurality of second anchors protrude from the radially inner surface of the housing and engage with the second grooves of the frame member.