CROSS REFERENCE TO RELATED APPLICATION

The present application claims the benefit of priority from Japanese Patent Application No. 2019-095125 filed on May 21, 2019. The entire disclosures of the above application are incorporated herein by reference.

FIELD

The present disclosure relates to a stator assembly and a motor.

BACKGROUND ART

In a conventional motor, a stator is tightly assembled to an inner wall of a cylindrical housing by interference fitting such as shrink fitting.

For example, a stator is provided with a contact region and a non-contact region alternately in a circumferential direction of an outer circumference. The contact region is in contact and the non-contact region is not in contact with an inner wall of a housing (sealed casing), respectively. As a result, magnetic property deterioration caused by compressive stress is alleviated and iron loss is reduced.

SUMMARY

According to the present disclosure, a stator assembly comprises a cylindrical housing, and a stator fixed to an inner wall of the housing by interference fitting, and formed of a plurality of annular stator cores stacked in an axial direction or formed of a plurality of split stator cores connected in a circumferential direction. Each stator core includes a plurality of protrusions and a plurality of recesses provided periodically in the circumferential direction on an outer periphery. The protrusion abuts at least a part of the inner wall of the housing in the circumferential direction. The recess is smaller than the protrusion in a radial direction and having a gap relative to the inner wall of the housing.

