Rotor and motor comprising same
AssigneeLG Innotek Co., Ltd.
InventorJung Soo YANG
Life of this patent
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Abstract
An embodiment presents a motor comprising: a shaft; a rotor to which the shaft is coupled; and a stator which is disposed at the exterior of the rotor, wherein: the stator comprises a stator core and a coil which is wound around the stator core; the stator core comprises a yoke, a tooth which protrudes from the yoke, and a first groove and a second groove which are formed on the inner surface of the tooth; and distances from the center of the circumferential direction of the tooth to the first groove and the second groove are different from each other. Accordingly, the motor can reduce cogging torque through a design for the grooves disposed to be asymmetrical with reference to the center of the tooth.
Claims20
A motor comprising:
- a housing;
- a stator disposed in the housing;
- a rotor disposed in the stator;
- and
- a shaft coupled to the rotor,
- wherein the rotor includes a first rotor core and a second rotor core coupled to the first rotor core,
- the first rotor core includes a body, a plurality of first holes formed in the body, and a first protrusion and a second protrusion which protrude from the body, and
- the second rotor core includes a first unit rotor core having a second-1 hole coupled to the first protrusion, a second unit rotor core having a second-2 hole coupled to the second protrusion, and a space formed between the first unit rotor core and the second unit rotor core.
A motor comprising:
- a housing;
- a stator disposed in the housing;
- a rotor disposed in the stator;
- and
- a shaft coupled to the rotor,
- wherein the rotor includes a first rotor core, a second rotor core disposed outside the first rotor core, a plurality of first magnets coupled to the first rotor core, and a plurality of second magnets coupled to the second rotor core,
- the magnet and the second magnet arc dispose to have a predetermined gap (G2) in a radial direction, and
- a flux density of the first magnet is different from a flux density of the second magnet.
Dependencies are inferred from the claim text.