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US 11,888,355 B2Granted
Rotor and motor including same
AssigneeLG Innotek Co., Ltd.
InventorsJin Su Pyeon, Seong Jin Kim
Life of this patent
Estimating the term…
Abstract
An embodiment relates to a rotor and a motor comprising same, the rotor comprising: a rotor core; and a plurality of first magnets and second magnets arranged along the outer circumferential surface of the rotor core, wherein each of the second magnets is disposed between the first magnets, and the outer circumferential surface of each of the first magnets has a curvature greater than that of the outer circumferential surface of the second magnet. Therefore, the motor can reduce cogging torque by using the first magnet and the second magnet having different shapes, and thus can improve the quality of the motor.
Claims15
A rotor comprising:
- a rotor core;
- and
- a plurality of first magnets and second magnets disposed along an outer circumferential surface of the rotor core,
- wherein the second magnets are disposed between the first magnets, and
- a curvature of an outer circumferential surface of the first magnet is greater than a curvature of an outer circumferential surface of the second magnet, wherein:
- with respect to a thickness which is a distance from an inner circumferential surface of the first magnet to the outer circumferential surface of the first magnet, a thickness of a central portion of the first magnet and a thickness of an end portion of the first magnet are different;
- with respect to a thickness which is a distance from an inner circumferential surface of the second magnet to the outer circumferential surface of the second magnet, a thickness of a central portion of the second magnet and a thickness of an end portion of the second magnet are different;
- the thickness of both end portions of the first magnet are the same;
- and
- the thickness of the end portion of the first magnet is less than the thickness of the end portion of the second magnet disposed to face to the end portion of the first magnet.
7 more elements
A rotor comprising:
- a rotor core;
- and
- a plurality of first magnets and second magnets disposed along an outer circumferential surface of the rotor core,
- wherein the first magnet includes a first inner circumferential surface in contact with the rotor core and a first outer circumferential surface disposed opposite to the first inner circumferential surface,
- the second magnet includes a second inner circumferential surface in contact with the rotor core and a second outer circumferential surface disposed opposite to the second inner circumferential surface,
- a length (l1) of the inner circumferential surface of the first magnet is equal to a length (l2) of the inner circumferential surface of the second magnet, and
- a position of a center between a center (C) of the rotor core and the outer circumferential surface of the first magnet and a position of a center between the center (C) of the rotor core and the outer circumferential surface of the second magnet are different in a radial direction,
- with respect to a thickness which is a distance from the inner circumferential surface of the first magnet to the outer circumferential surface of the first magnet, a thickness of a central portion of the first magnet and a thickness of an end portion of the first magnet are different,
- with respect to a thickness which is a distance from the inner circumferential surface of the second magnet to the outer circumferential surface of the second magnet, a thickness of a central portion of the second magnet and a thickness of an end portion of the second magnet are different, and
- the thickness of the end portion of the first magnet is less than the thickness of the end portion of the second magnet disposed to face to the end portion of the first magnet.
7 more elements
A motor comprising:
- a housing;
- a stator disposed inside the housing;
- a rotor disposed inside the stator;
- a shaft coupled to the rotor;
- and
- a cover disposed on the housing,
- wherein the rotor includes a rotor core, and a plurality of first magnets and second magnets disposed along an outer circumferential surface of the rotor core,
- the second magnets are disposed between the first magnets, and
- a curvature of an outer circumferential surface of the first magnet is greater than a curvature of an outer circumferential surface of the second magnet,
- with respect to a thickness which is a distance from an inner circumferential surface of the first magnet to the outer circumferential surface of the first magnet, a thickness of a central portion of the first magnet and a thickness of an end portion of the first magnet are different,
- with respect to a thickness which is a distance from an inner circumferential surface of the second magnet to the outer circumferential surface of the second magnet, a thickness of a central portion of the second magnet and a thickness of an end portion of the second magnet are different, and
- the thickness of the end portion of the first magnet is less than the thickness of the end portion of the second magnet disposed to face to the end portion of the first magnet.
9 more elements
Dependencies are inferred from the claim text.