Electric motor
AssigneeJohnson Electric S.A.
InventorsYong Bin Li, Long Shun Jiang, Xian Chun Fan, Ping Wang
Life of this patent
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Abstract
An electric motor includes a rotor and a wound stator structure. The stator structure includes a housing, a laminated stator core and windings wound around the stator core. The laminations of the stator core have an annular body and a plurality of teeth extending radially inwardly from the annular body. Projections and recesses are formed at the outer edge of the annular body. When assembled, the recesses of one lamination are aligned with the projections of an adjacent lamination such that when fitting the stator into the housing the projections may be deformed into an axially adjacent recess by contact with the housing. Thus the stator core contacts the housing at discrete locations.
Claims13
An electric motor comprising a rotor and a wound stator structure disposed about the rotor, the stator structure comprising:
- a housing having a cylindrical inner wall;
- a stator core mounted in the housing, and
- stator windings wound around the stator core,
- wherein the stator core comprises an annular yoke extending circumferentially and tooth parts extending inwardly from the yoke, the stator core is formed by stacking a plurality of laminations, and each lamination comprises an annular body that forms the yoke and a plurality of teeth that form the tooth parts,
- projections and recesses are formed on an outer edge of the annular body of the laminations to form a knurling on a radially outer surface of the yoke, the projections are in contact with the inner wall of the housing, and in an axial direction of the stator structure, the projections and the recesses are interposed, allowing the projections to be deformed axially, so that the yoke contacts the inner wall of the housing at discrete locations.
Dependencies are inferred from the claim text.