Patent ID: 7812484

Claim:
A motor housing comprising: a housing of a motor; and a permanent magnet disposed at an inner peripheral portion of said housing, said permanent magnet comprising a hollow-cylinder shaped anisotropic rare earth bonded magnet that is heated and press-fitted along said inner peripheral portion of said housing, said anisotropic rare earth bonded magnet comprising: an anisotropic rare earth magnet powder; and a phenol-novolac type epoxy resin being used as a binder and having a weight ratio to the anisotropic rare earth bonded magnet in a range of 2 to 3 percent by weight, said anisotropic rare earth magnet powder being compounded and subsequently molded with said phenol-novolac type epoxy resin wherein an exposed surface layer of said anisotropic rare earth bonded magnet which is press-fitted in said housing is processed by at least an infiltration treatment using a polyamide-imide-based resin to form a coating layer which has a pinhole density of 10 pinholes/cm 2 or less.