US 10,299,559 B2 · Single phase permanent magnet motor and hair dryer using the same

Abstract

A single phase motor and a hair dryer are provided. The motor includes a stator and a rotor. The stator includes a stator core and a stator winding. The stator core includes an outer ring portion, teeth extending inwardly from the outer ring portion, and two pole shoes extending from a distal end of each tooth. A winding slot is formed between each two adjacent teeth. A slot opening is disposed between the pole shoes of the adjacent teeth, and is offset from one of the two adjacent teeth. The air supplying unit includes the single phase motor and an impeller. The startup angle and cogging torque of the motor are adjustable by adjusting the position/width of the slot opening, without the need of additional positioning slots or positioning holes defined at the pole shoes, which makes the motor structure simple.

Claims19

Dependent claims

A single phase motor comprising

a stator comprising:
a stator core comprising an outer ring portion and a plurality of teeth extending inwardly from the outer ring portion;
and
a stator winding wound around the stator core;
and
a rotor rotatable relative to the stator, the rotor comprising a plurality of rotor magnetic poles;
wherein each tooth of the stator comprises a tooth body extending inwardly from the outer ring portion and two pole shoes extending respectively from a distal end of the tooth body in two opposite circumferential directions of the rotor and facing the rotor, and the two pole shoes are asymmetrical about a center line of the tooth body such that when the stator winding is not energized the rotor is capable of stopping at an initial position where a center line of each rotor magnetic pole deviates from the center line of a corresponding tooth body.

4 more elements

A hair dryer comprising an enclosure, a heat generating unit, an air supply unit and a control unit disposed in an interior of the enclosure, the air supply unit comprising a single phase motor and an impeller driven by the single phase motor, the single phase motor comprising:

a stator comprising:
a stator core comprising an outer ring portion and a plurality of teeth extending inwardly from the outer ring portion;
and
a stator winding wound around the stator core;
and
a rotor rotatable relative to the stator, the rotor comprising a plurality of rotor magnetic poles;
wherein each tooth comprises a tooth body extending inwardly from the outer ring portion, and a large pole shoe and a small pole shoe respectively extending from a distal end of the tooth body in two opposite circumferential directions of the rotor, the pole shoes facing the rotor magnetic poles with an air gap formed there between.

4 more elements

Dependencies are inferred from the claim text.

Single phase permanent magnet motor and hair dryer using the same

Life of this patent

Single phase permanent magnet motor and hair dryer using the same

Life of this patent

Abstract

Claims19