Axial flux motor with stator pre-load

摘要

A motor comprises a stator assembly, a rotor assembly having a stator core, and a stator cup adjacent the stator core. The inside surface of the stator cup comprises a plurality of aligned regions and a plurality of pressure regions. Each of the plurality of aligned regions is axially aligned with a corresponding one of a plurality of fastener-engaging regions of the stator cup. Each of the plurality of pressure regions is spaced from each of the plurality of aligned regions. A plurality of fastening portions operatively engages the fastener-engaging regions and operatively engages the stator core in a manner urging the stator core and the stator cup toward one another. Urging of the stator core and the stator cup toward one another by the plurality of fastening portions causes the stator core to exert pressure on the plurality of pressure regions. The pressure being exerted on the plurality of pressure regions by the stator core as a result of the fastening portions urging the stator core and the stator cup toward one another is greater than pressure being exerted on the plurality of aligned regions by the stator core.

主权项

1. An axial flux motor comprising:
an axial flux stator assembly comprising a stator core; an axial flux rotor assembly, the rotor assembly being adjacent the stator assembly and rotatable relative to the stator assembly about a rotor axis; a stator cup adjacent the stator core comprising a plurality of through fastener-receiving openings, an inside surface opposing the stator core, and an outside surface facing away from the stator core, the inside surface of the stator cup comprising a plurality of aligned regions and a plurality of pressure regions, each one of the plurality of aligned regions being at least twice as wide as and circumscribing a corresponding one of the plurality of fastener-receiving openings, each one of the plurality of fastener-receiving openings being closer to its corresponding one of the plurality of aligned regions than to any of the plurality of pressure regions; a plurality of fasteners extending through the fastener-receiving openings and urging the stator core and the stator cup toward one another such that the inside surface of the stator cup exerts forces against the stator core and the stator core exerts forces against the inside surface of the stator cup; the stator cup and the stator core being shaped and configured such that the urging of the stator core and the stator cup toward one another by the plurality of fasteners causes the stator core to exert pressure on the plurality of pressure regions, the stator cup and the stator core being shaped and configured such that the pressure being exerted on the plurality of pressure regions by the stator core as a result of the fasteners urging the stator core and the stator cup toward one another is greater than pressure being exerted on the plurality of aligned regions by the stator core as a result of the fasteners urging the stator core and the stator cup toward one another.