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US 11,777,347 B2Granted
Motor having a first rotor core containing magnets and a second rotor core made of magnetic material
AssigneeLG Electronics Inc.
InventorsChisung Park, Sangjoon Eum, Gyujong Jeong
Life of this patent
Estimating the term…
Abstract
An electric motor and a compressor having an electric motor. The electric motor may include a stator, and a rotor provided with a rotational shaft, a rotor core coupled to the rotational shaft, and permanent magnets coupled to the rotor core. The rotor core may include a first core to which the permanent magnets may be coupled, and a second core made of a magnetic material and coupled to an end of the first core in an axial direction. The second core may have outer surfaces disposed inside of extension lines extending in the axial direction from inner surfaces of the permanent magnets.
Claims15
An electric motor, comprising:
- a stator;
- and
- a rotor provided with a rotational shaft, a rotor core coupled to the rotational shaft, and permanent magnets coupled to the rotor core, wherein the rotor core comprises:
- a first core to which the permanent magnets are coupled;
- and
- a second core made of a magnetic material and coupled to an end of the first core in an axial direction, wherein each of the permanent magnets has an outer surface and an inner surface spaced apart from each other in a radial direction, wherein the second core has outer surfaces disposed at an outer side in the radial direction, and at least a portion of the outer surfaces of the second core is disposed inside of an extension line extending in the axial direction from the inner surface of the permanent magnet, wherein each of the permanent magnets has a shape with a rectangular cross-section and is spaced apart from each other in a circumferential direction of the first core, wherein the first core is provided with a plurality of permanent magnet coupling portions formed to extend therethrough in the axial direction in which the permanent magnets are inserted, wherein the first core comprises flux barriers formed at both sides of the permanent magnet in a circumferential direction of the first core, wherein the permanent magnets are arranged in even numbers in a circumferential direction of the first core, and wherein the second core comprises:
- first linear cutouts formed by linearly cutting out an outer surface thereof to correspond to inner surfaces of permanent magnet coupling portions and inner surfaces of the flux barriers;
- and
- second linear cutouts each having an outer surface cut to be closer to a center of the second core formed by cutting out the outer surface thereof further than the first linear cutouts.
6 more elements
An electric motor, comprising:
- a stator;
- and
- a rotor provided with a rotational shaft, a rotor core coupled to the rotational shaft, and permanent magnets coupled to the rotor core, wherein the rotor core comprises:
- a first core having permanent magnet coupling portions formed through the first core into which the permanent magnets are inserted;
- and
- a second core stacked on an end of the first core, wherein the second core has outer surfaces disposed at an outer side in a radial direction, wherein a radial length of the outer surfaces of the second core, in a region adjacent to the permanent magnets, is equal to or shorter than a radial length of the permanent magnet coupling portions, wherein the first core comprises flux barriers formed at both sides of the permanent magnet in a circumferential direction of the first core, wherein the permanent magnets are arranged in even numbers in a circumferential direction of the first core, and wherein the second core comprises:
- first linear cutouts formed by linearly cutting out an outer surface thereof to correspond to inner surfaces of permanent magnet coupling portions and inner surfaces of the flux barriers;
- and
- second linear cutouts each having an outer surface cut to be closer to a center of the second core formed by cutting out the outer surface thereof further than the first linear cutouts.
6 more elements
An electric motor, comprising:
- a stator;
- and
- a rotor provided with a rotational shaft, a rotor core coupled to the rotational shaft, and permanent magnets coupled to the rotor core, wherein the rotor core comprises:
- a first core to which the permanent magnets are coupled;
- and
- a second core coupled to an end of the first core in an axial direction, wherein each of the permanent magnets has an outer surface and an inner surface spaced apart from each other in a radial direction, wherein the second core has outer surfaces disposed at an outer side in the radial direction, and at least a portion of the outer surfaces of the second core is disposed inside of an extension line extending in the axial direction from the inner surface of the permanent magnet, wherein each of the permanent magnets has a shape with a rectangular cross-section and is spaced apart from each other in a circumferential direction of the first core, wherein the first core is provided with a plurality of permanent magnet coupling portions formed to extend therethrough in the axial direction in which the permanent magnets are inserted, wherein the first core comprises flux barriers formed at both sides of the permanent magnet in a circumferential direction of the first core, wherein the permanent magnets are arranged in even numbers in a circumferential direction of the first core, and wherein the second core comprises:
- first linear cutouts formed by linearly cutting out an outer surface thereof to correspond to inner surfaces of permanent magnet coupling portions and inner surfaces of the flux barriers;
- and
- second linear cutouts each having an outer surface cut to be closer to a center of the second core formed by cutting out the outer surface thereof further than the first linear cutouts.
6 more elements
An electric motor, comprising:
- a stator;
- and
- a rotor provided with a rotational shaft, a rotor core coupled to the rotational shaft, and permanent magnets coupled to the rotor core, wherein the rotor core comprises:
- a first core to which the permanent magnets are coupled;
- a second core made of a magnetic material and coupled to an end of the first core in an axial direction, wherein each of the permanent magnets has an outer surface and an inner surface spaced apart from each other in a radial direction, wherein the second core has outer surfaces disposed at an outer side in the radial direction, and at least a portion of the outer surfaces of the second core is disposed inside of an extension line extending in the axial direction from the inner surface of the permanent magnet;
- and
- at least one axial separation prevention member brought into contact with an end of the first core to suppress axial separation of the permanent magnets, wherein the at least one axial separation prevention member comprises:
- a body having outer surfaces that are linearly cut to correspond to inner surfaces of permanent magnet coupling portions and inner surfaces of flux barriers;
- and
- end surface contact portions that protrude outwardly from the outer surfaces of the body in a radial direction of the rotor core to contact end surfaces of the permanent magnets in the axial direction.
7 more elements
Dependencies are inferred from the claim text.