Patent ID: 7164218

Claim:
An electric type compressor motor comprising: a housing having an inner circumferential surface, the housing also having a first thermal expansion coefficient, the housing further having an elastic part and having a plurality of recesses which are formed near the elastic part extending outwardly in the radial direction of the inner circumferential surface to define corresponding first voids; an electric motor including a circular stator core pressed to an inside of the housing by tight fit, the stator core having an outer circumferential surface and a central axis, the stator core also having a second thermal expansion coefficient that is different from the first thermal expansion coefficient; a compressor mechanism accommodated in the housing and connected to the electric motor for compressing gas as driven by the electric motor; wherein second voids are defined between the inner circumferential surface outside the recesses of the housing and the outer circumferential surface of the stator core so as to prevent the inner and the outer circumferential surfaces from contacting each other in a circular region, wherein the first voids and the second voids extend substantially along the length of the stator core in the direction of the central axis of the stator core and wherein one of the first voids and corresponding one of the second voids define a void, wherein the elastic part of the housing is located near each of the first voids, and wherein the elastic part of the housing is elastically deformed when the housing and the stator core expand or shrink so as to tightly fit each other due to a differential between the first and the second thermal expansion coefficients.