Patent ID: 9705366
Date: 2017-07-11
CPC Classifications: H02K

Claim:
1. An embedded permanent magnet rotary electric machine comprising: an annular stator; and a rotor that is disposed coaxially inside said stator so as to have an air gap interposed, wherein: said rotor comprises: R1>R2>R3 is satisfied, where R1 is a radius of curvature of a cylindrical surface that contacts said circular arc-shaped curved surfaces that are arranged circumferentially, R2 is a radius of curvature of said circular arc-shaped curved surfaces, and R3 is a radius of curvature of an upper surface of said permanent magnets; said magnet housing apertures comprise air gap portions in which radially outer portions of two circumferential side portions are expanded circumferentially outward; surfaces that are parallel to a plane that includes said magnetic pole center that contact said two circumferential side surfaces of said permanent magnets are disposed on radially inner portions of said two circumferential side portions of said magnet housing apertures; B2>B1 is satisfied, where B1 is a thickness of a core portion of said rotor core between said circular arc-shaped curved surfaces and said magnet housing apertures at said magnetic pole center, and B2 is a thickness of a circumferential end portion of said core portion; and a distance between circumferentially adjacent air gap portions and a distance between circumferentially adjacent surfaces among said surfaces that are parallel to said plane that includes said magnetic pole center that contact said two circumferential side surfaces of said permanent magnets are equal.