Patent ID: 7843103

Claim:
An electrical motor comprising: a rotor; a stator disposed concentrically with said rotor, and including a stator core that defines an axis, that has an axially extending surface around said axis, and that is formed with a plurality of angularly displaced first slot units and a plurality of angularly displaced second slot units which are alternately disposed with said first slot units, each of said first slot units including at least two angularly displaced first slots indented from said axially extending surface in radial directions relative to said axis, each of said second slot units including at least two angularly displaced second slots indented from said axially extending surface in radial directions relative to said axis, each of said first slots of said first slot units and said second slots of said second slot units defining a depth measured from said axially extending surface toward said axis, said stator core being further formed with a plurality of first poles, each of which is disposed between said first slots of a respective one of said first slot units and defines adjacent sides of said first slots of the respective one of said first slot units, and a plurality of second poles, each of which is disposed between said second slots of a respective one of said second slot units and defines adjacent sides of said second slots of the respective one of said second slot units, said depth of each of said first slots being deeper than that of each of said second slots; a first winding that is wound on said first poles; and a second winding that is wound on said second poles such that said first winding and said second winding overlap with each other while being wound around the stator core; wherein said first winding has a first, a second, a third, and a fourth side, and said second winding has a fifth, a sixth, a seventh, and an eighth side; said fifth side intersecting with said first and said second side, said sixth side intersecting with said second and said third side, said seventh side intersecting with said third and said fourth side, and said eighth side intersecting with said first and said fourth side.