# US 10,770,947 B2 · Method for manufacturing a motor

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,770,947 B2
- Document ID: US10770947B2
- Status: Granted
- Kind: B2
- Application number: 15/575,304
- Filed: 2016-05-17
- Published: 2018-06-07
- Granted: 2020-09-08
- Earliest claimed: 2015-05-18
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Jangwon Lee; Chungook Chong; Geunbae Hwang
- Web page: https://patentgrep.com/patent/US10770947B2

## CPC

- H02K 5/15: Mounting arrangements for bearing-shields or end plates
- H02K 1/2726: the rotor consisting of a single magnet or two or more axially juxtaposed single magnets
- H02K 1/2733: Annular magnets
- H02K 1/28: Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
- H02K 15/03: having permanent magnets
- H02K 15/165: Balancing the rotors
- H02K 5/10: with arrangements for protection from ingress, e.g. water or fingers
- H02K 7/04: Balancing means
- H02K 21/16: having annular armature cores with salient poles (with homopolar co-operation H02K21/20)
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A method of making a motor having a shaft; a pair of end plates arranged to be spaced apart from each other on the shaft; a magnet disposed between the pair of end plates; and a rotor case which surrounds the outer peripheries of the pair of end plates and the outer periphery of the magnet and is made of a synthetic resin material, wherein each of the pair of end plates includes: a flange part, one surface of which faces the magnet; and a cylinder part protruding in a direction opposite to the magnet from the flange part, and the flange part includes a tapered part having an outer diameter which decreases toward the cylinder part.

## Claims

### Claim 1

A method for manufacturing a motor, the method comprising:
forming a plurality of end plates, each end plate having a cylinder portion protruding from a flange portion;
assembling one of the plurality of end plates to a shaft;
assembling the magnet to the shaft and the end plate assembled with the shaft;
assembling the other of the plurality of end plates to the shaft; and
inserting the end plates and the magnet assembled with the shaft into a mold, and molding a rotor case by injection molding around outer circumferences of the end plates and an outer circumference of the magnet,
wherein the forming a plurality of end plates comprises:
forming the flange portion and the cylinder portion protruding from the flange portion; and
forming, on the flange portion, a tapered portion, an outer diameter of the tapered portion becoming smaller as the tapered portion gets closer to the cylinder portion.

### Claim 2 (depends on 1)

The method of claim 1, wherein the forming a plurality of end plates further comprises forming the tapered portion by cutting off part of the flange portion closer to the cylinder portion.

### Claim 3 (depends on 2)

The method of claim 2, wherein the molding further comprises molding together a center case portion surrounding the magnet, and end case portions surrounding the cylinder portion and the tapered portion.

### Claim 4 (depends on 3)

The method of claim 3, wherein the molding further comprises molding the end case portions thicker than the center case portion.

### Claim 5 (depends on 3)

The method of claim 3, further comprising adjusting balancing of the cylinder portion by cutting off part of the cylinder portion and part of the end case portions.

### Claim 6 (depends on 1)

The method of claim 1, wherein the molding is performed by injecting synthetic resin material comprising a carbon long fiber reinforced plastic.