Patent ID: 8536758
Filing Date: 2013-09-17
Classification: H02K

Abstract:
1. An electric machine, comprising: a rotor with a shaft having a longitudinal axis and a stator including two stator units coaxially disposed, one of said stator units being inside the rotor and another one of said two stator units being outside the rotor, wherein said one of said stator units comprises a plurality of superimposed laminations having a first annular part from which a plurality of first teeth emerge radially and centrifugally, wherein said another one of said stator units comprises a plurality of superimposed laminations having a second annular part from which a plurality of second teeth emerge radially and centripetally, wherein each of said first teeth and said second teeth has a leg portion, said leg portion being connected with one of said first annular part and said second annular part and an enlarged head portion, wherein said rotor comprises a rotor ring formed by a plurality of parallelepiped permanent magnets having a predetermined width, height and length, wherein: a width of the first teeth of said one of said stator units is equal to thirty percent of said predetermined width of said magnets; a width of the enlarged head portion of the first teeth of said one of said stator units is equal to forty percent of said predetermined width of said magnets; a width of the second teeth of said another one of said stator units is equal to a chord of a circle arc delimited by two radii tangent to edges of said enlarged head of a first tooth of said one of said stator units, a radius of said circle arc being R=R a width of the enlarged head portion of the second teeth of said another one of said stator units is equal to one-hundred and ten percent of said width of said second teeth.