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US 12,362,613 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.
Claims11
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 the first core is provided with first ribs on an outer circumferential surface thereof, which are disposed on both sides of the permanent magnet in the radial direction, wherein the second core is provided with second ribs corresponding to the first ribs and protruding to contact extension lines extending in the axial direction from ends of the first ribs, and wherein the second core comprises first arcuate cutouts formed by cutting out the outer surfaces thereof to correspond to extension lines extending in the axial direction from the inner surfaces of the permanent magnets, and second arcuate cutouts each having an outer surface cut to be close to a center of the second core formed by cutting out the outer surface thereof further than the first arcuate cutouts.
3 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, and 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 each of the permanent magnets is defined in an arcuate shape, wherein the first core is provided with first ribs on an outer circumferential surface thereof, which are disposed on both sides of the permanent magnet in a radial direction of the first core, and wherein the second core is provided with second ribs corresponding to the first ribs and protruding to contact extension lines extending in the axial direction from ends of the first ribs, and wherein the second core comprises first arcuate cutouts formed by cutting out the outer surfaces thereof to correspond to extension lines extending in the axial direction from the inner surfaces of the permanent magnets, and second arcuate cutouts each having an outer surface cut to be close to a center of the second core formed by cutting out the outer surface thereof further than the first arcuate cutouts.
3 more elements
Dependencies are inferred from the claim text.