Rotor assembly and motor including the same

Patent metadata

Field	Value
Publication number	US-10224770-B2
Application number	US-201615163273-A
Country	US
Kind code	B2
Filing date	May 24, 2016
Priority date	May 27, 2015
Publication date	Mar 5, 2019
Grant date	Mar 5, 2019

Abstract

The present invention relates to a rotor assembly including a yoke member having a cylindrical shape with a hole through which a rotating shaft passes, a plurality of magnet groups attached to an outer circumferential surface of the yoke member, and a first molding unit formed along an inner circumferential surface of the yoke member and having an arrangement hole of the rotating shaft at a center part thereof.

First claim

What is claimed is:

1. A rotor assembly comprising:
a yoke member having a cylindrical shape with a hole through which a rotating shaft passes;
a plurality of magnet groups attached to an outer circumferential surface of the yoke member;
a first molding unit formed along an inner circumferential surface of the yoke member and having an arrangement hole of the rotating shaft at a center part thereof; and
a second molding unit configured to seal outer circumferential surfaces of the yoke member and the magnet groups,
wherein the yoke member is formed of a magnetic material,
wherein the first molding unit is formed of a nonmagnetic material,
wherein the first molding unit and the second molding unit are formed of the same material, and
wherein the first molding unit and the second molding unit are formed through a single molding process.

2. The rotor assembly of claim 1 , wherein the magnet groups include a plurality of unit magnets disposed in a longitudinal direction of the yoke member and the plurality of unit magnets are disposed so that boundary parts of the unit magnets adjacent to each other cross each other.

3. The rotor assembly of claim 2 , wherein the plurality of magnet groups are disposed to be spaced apart from each other along the outer circumferential surface of the yoke member.

4. A motor comprising:
a motor housing;
a coil unit wound along an inner circumferential surface of the motor housing;
a rotating shaft mounted at a center part of the motor housing to be rotatable using bearings; and
a rotor assembly coupled so that the rotating shaft passes therethrough,
wherein the rotor assembly includes:
a yoke member having a cylindrical shape with a hole to be penetrated;
a first molding unit attached to the rotating shaft and configured to fill up the hole along an inner circumferential surface of the yoke member;
a plurality of magnet groups disposed along an outer circumferential surface of the yoke member; and
a second molding unit formed of the material same as that of the first molding unit and configured to seal outer circumferential surfaces of the yoke member and the plurality of magnet groups,
wherein the first molding unit and the second molding unit are formed through a single molding process.

5. The motor of claim 4 , wherein the magnet groups include a plurality of unit magnets disposed in a longitudinal direction of the yoke member, and the plurality of unit magnets are disposed so that boundary parts of the unit magnets adjacent to each other cross each other.

Assignees

• Lg Innotek Co Ltd

Inventors

• Kim Yong Chul

Classifications

• H02K1/28

  Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures · CPC title

• H02K2201/06

  Magnetic cores, or permanent magnets characterised by their skew · CPC title

• H02K2201/15

  Sectional machines · CPC title

• H02K15/03

  having permanent magnets · CPC title

• H02K1/2753 Primary

  the rotor consisting of magnets or groups of magnets arranged with alternating polarity · CPC title