Rotor and motor comprising same

Patent metadata

Field	Value
Publication number	US-11469641-B2
Application number	US-201816636142-A
Country	US
Kind code	B2
Filing date	Jul 30, 2018
Priority date	Aug 3, 2017
Publication date	Oct 11, 2022
Grant date	Oct 11, 2022

Abstract

The present invention provides a rotor comprising: a rotor core; a plurality of magnets disposed outside the rotor core; and a molding part disposed outside the plurality of magnets, wherein the rotor core includes a plurality of guide protrusions disposed between the plurality of magnets, and the distance from the center of the rotor core to the outer surface of the molding part passing across the center of one of the guide protrusions is shorter than the distance from the same to the outer surface of the molding part passing across the center of one of the plurality of magnets.

First claim

The invention claimed is:

1. A rotor comprising:
a rotor core;
a plurality of magnets arranged outside the rotor core; and
a cover disposed outside the plurality of magnets,
wherein the rotor core comprises a plurality of guide protrusions disposed between the plurality of magnets,
wherein a distance from a center of the rotor core to an outer surface of the cover through a center of one the plurality of guide protrusion is smaller than a distance from the center of the rotor core to the outer surface of the cover through a center of one of the plurality of magnets,
wherein the rotor further comprises a sensor magnet disposed above the rotor core,
wherein the cover is disposed outside the sensor magnet, and
wherein a thickness of the cover disposed outside the plurality of magnets based on a radial direction of the center of the rotor core is smaller than a thickness of the cover disposed outside the sensor magnet.

2. The rotor of claim 1 , wherein a cross section of the cover taken along a direction perpendicular to a longitudinal direction of the plurality of magnets comprises a convex portion and a concave portion, and
wherein the convex portion and the concave portion are alternately arranged.

3. The rotor of claim 2 , wherein a center of the concave portion is disposed outside the rotor core.

4. A motor comprising:
a shaft;
a rotor comprising a hole in which the shaft is disposed; and
a stator disposed outside the rotor,
wherein the rotor comprises:
a rotor core;
a plurality of magnets arranged outside the rotor core; and
a cover disposed outside the plurality of magnets,
wherein the rotor core comprises a plurality of guide protrusions disposed between the plurality of magnets,
wherein a distance from a center of the rotor core to an outer surface of the cover through a center of one the plurality of guide protrusion is smaller than a distance from the center of the rotor core to the outer surface of the cover through a center of one of the plurality of magnets,
wherein the cover is a can member,
wherein the can member comprises a first can and a second can disposed at both ends of the rotor core,
wherein the first can and the second can are arranged so that a bottom end of the first can comes into contact with a bottom end of the second can, and
wherein the first can and the second can comprise a first weld bead disposed through the bottom end of the first can and the bottom end of the second can.

5. The motor of claim 4 , wherein the rotor core comprises a plurality of guide protrusions, and
wherein the plurality of guide protrusions protrude from an outer circumferential surface of the rotor core in a radial direction of the rotor core and are arranged along an axial direction of the shaft.

6. The motor of claim 4 , wherein the can member comprises a groove portion, and
wherein the groove portion comprises a bottom surface and sidewalls disposed on both ends of the bottom surface.

7. The motor of claim 5 , wherein the can member comprises a groove portion,
wherein the groove portion comprises a bottom surface and sidewalls disposed on both ends of the bottom surface, and
wherein the bottom surface of the groove portion comes into contact with the plurality of guide protrusions.

8. The motor of claim 7 , wherein the sidewalls are disposed to be spaced apart from the plurality of magnets.

9. The rotor of claim 1 , wherein the sensor magnet has a ring shape.

10. The rotor of claim 1 , wherein the sensor magnet includes a hole in a center thereof through which a shaft passes.

11. The rotor of claim 2 , wherein the concave portion is arranged to be symmetrical based on the center of the rotor core.

12. The rotor of claim 2 , wherein a thickness of the convex portion is equal to a thickness of the concave portion.

Assignees

• Lg Innotek Co Ltd

Inventors

• Han Ji Hoon
• Won Il Sik
• Yoo Jin Seung

Classifications

• H02K21/22

  with magnets rotating around the armatures, e.g. flywheel magnetos · CPC title

• H02K1/30

  using intermediate parts, e.g. spiders · CPC title

• H02K7/116

  with gears · CPC title

• H02K15/03

  having permanent magnets · CPC title

• H02K11/215

  Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements · CPC title