Patent ID: 8212447

Claim:
A magnet embedded rotor comprising: permanent magnets embedded in an iron core of a rotor at a fixed interval; a plurality of salient poles corresponding to the permanent magnets occurring in the iron core and extending to an outer surface of the rotor; a plurality of notched portions; non-magnetic parts for preventing a short circuit of magnetic flux formed at respective ends of said permanent magnets; and bridge parts respectively corresponding to the non-magnetic parts and being positioned radially between the corresponding non-magnetic part and a notched portion of the plurality of notched portions, each of said bridge parts having a radial length allowing for magnetic saturation; wherein an outer surface of each one of the plurality of salient poles occurs between a pair of notched portions of said plurality of notched portions around a circumference of the rotor, wherein a respective notched portion of the plurality of notched portions is positioned between adjacent salient poles, the outer surface of said each one of the salient poles being at a first rotor outer surface distance measured from a radial center of the rotor , which is greater than a second rotor outer surface distance measured from the radial center of the rotor to said respective adjacent notched portion, wherein each one notched portion of the plurality of notched portions extends along an arc circumferentially from a first notch end at a first salient pole outer surface to a second notch end at a second salient pole outer surface, wherein the magnet embedded rotor further comprises along each one of the plurality of notched portions: a first protruding part extending to a first height from a base of said one notched portion; and a second protruding part extending to a second height from the base of said one notched portion, said second height being less than said first height.