Patent ID: 8912701
Filing Date: 2014-12-16
Classification: F04C,F25B,H02K

Abstract:
1. An induction motor comprising: a rotor, which is a squirrel-cage-type secondary conductor, formed by filling a nonmagnetic and conductive material in the inside of rotor slots each having a taper-shaped projection in a center portion of an outer peripheral side of the rotor slot, said projection extending toward the outer periphery of the rotor; and a stator which surrounds the rotor and is provided with a stator core having a stator tooth around which a winding is wound, wherein a magnetic path width of the rotor is equal to or larger than a magnetic path width of the stator, where the magnetic path width of the rotor is a product of a circumferential width of a rotor tooth formed in the rotor and a number of rotor teeth and the magnetic path width of the stator is a product of a circumferential width of the stator tooth formed in the stator and a number of stator teeth, a distal end of the projection and an outer periphery of the rotor are separated, and a distance between distal ends of the projections of neighboring slots is larger than a width of the distal end of the stator tooth.