# US 2014/0152137 A1 · Motor with variable magnet flux

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- Number: US 2014/0152137 A1
- Document ID: US20140152137A1
- Status: Published application
- Kind: A1
- Application number: 14/042,742
- Filed: 2013-10-01
- Published: 2014-06-05
- Earliest claimed: 2012-12-03
- Assignees: New Motech Co., Ltd.
- Applicants: New Motech Co., Ltd.
- Inventors: Jeong Cheol JANG; Je Hyung SEO; Soo Hyun PARK; Woon Pil JUNG; Hugh Jin CHO; Seung Jae LEE; Byung Taek KIM; Jin Seok JANG
- Web page: https://patentgrep.com/patent/US20140152137A1

## CPC

- H02K 1/2791: Surface mounted magnets; Inset magnets
- H02K 21/22: with magnets rotating around the armatures, e.g. flywheel magnetos
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

Disclosed therein is a motor with a variable magnetic flux, which includes a rotor and a stator located inside the rotor. The rotor includes a rotor housing, a rotor core attached to the inner circumference of the rotor housing, and magnets attached to the inner surface of the rotor core. The stator includes a stator core base and a plurality of teeth radially formed on the outer peripheral surface of the stator core base at equal intervals, and each of the teeth has ears formed at both sides of an end thereof. The magnets are divided into first magnets and second magnets, the second magnets are low in coercive force than the first magnets, and a plurality of the first magnets are located at both sides of the second magnets.

## Claims

### Claim 1

A motor with a variable magnetic flux, which includes a rotor and a stator located inside the rotor,
wherein the rotor comprises a rotor housing, a rotor core attached to the inner circumference of the rotor housing, and magnets attached to the inner surface of the rotor core,
wherein the stator comprises a stator core base and a plurality of teeth radially formed on the outer peripheral surface of the stator core base at equal intervals, and each of the teeth has ears formed at both sides of an end thereof, and
wherein the magnets are divided into first magnets and second magnets, the second magnets are low in coercive force than the first magnets, and a plurality of the first magnets are located at both sides of the second magnets.

### Claim 2 (depends on 1)

The motor according to claim 1, wherein the first magnets are ferrite magnets and the second magnets are alnico magnets.

### Claim 3 (depends on 1)

The motor according to claim 1, wherein the rotor core is formed by a plurality of unit rotor cores connected with each other.

### Claim 4 (depends on 3)

The motor according to claim 3, wherein laser welding lines are formed at both sides of the unit rotor core.

### Claim 5 (depends on 3)

The motor according to claim 3, wherein at least one first combining groove is vertically formed on the outer surface of the unit rotor core.

### Claim 6 (depends on 3)

The motor according to claim 3, wherein at least one second combining groove is vertically formed on the inner surface of the unit rotor core.