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US 8,912,701 B2Granted
Induction motor, compressor and refrigerating cycle apparatus
AssigneeMitsubishi Electric Corporation
InventorsTakahiro Tsutsumi, Koji Yabe
Life of this patent
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Abstract
The efficiency of an induction motor is improved while suppressing the generation of magnetic flux saturation of a rotor core. In an induction motor, “a magnetic path width of a rotor” which is the product of a circumferential width of a rotor tooth formed in the rotor and the number of rotor teeth is equal to or larger than “a magnetic path width of a stator” which is the product of a circumferential width of a stator tooth formed in the stator and the number of stator teeth.
Claims3
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.
3 more elements
Dependencies are inferred from the claim text.