# US 2014/0191609 A1 · Motor

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- Number: US 2014/0191609 A1
- Document ID: US20140191609A1
- Status: Published application
- Kind: A1
- Application number: 14/151,439
- Filed: 2014-01-09
- Published: 2014-07-10
- Earliest claimed: 2013-01-09
- Assignees: Industry-University Cooperation Foundation Hanyang University; LG Innotek Co., Ltd.
- Applicants: Industry-University Cooperation Foundation Hanyang University; LG Innotek Co., Ltd.
- Inventors: Joon Keun WOO; Jung Pyo HONG; Kang Il PARK
- Web page: https://patentgrep.com/patent/US20140191609A1

## CPC

- H02K 1/2773: {consisting of tangentially magnetized radial magnets}
- H02K 1/22: Rotating parts of the magnetic circuit
- H02K 1/276: Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K 1/28: Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
- H02K 2213/03: Machines characterised by numerical values, ranges, mathematical expressions or similar information
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A motor includes a stator having a ring type structure and including a plurality of teeth protruding toward an inner surface of the stator and coils wound around the teeth; and a rotor including a core with a plurality of permanent magnets circumferentially magnetized inside the stator around a rotation shaft and a non-magnetic member between the core and the rotation shaft, and the permanent magnet includes a protrusion protruding to the non-magnetic member. An area of the permanent magnet is increased by increasing a length of the permanent magnet so that a magnetic flux can be increased to increase a torque.

## Claims

### Claim 1

A motor comprising:
a stator having a ring type structure and including a plurality of teeth protruding toward an inner surface of the stator and coils wound around the teeth; and
a rotor including a core with a plurality of permanent magnets circumferentially magnetized inside the stator around a rotation shaft and a non-magnetic member between the core and the rotation shaft,
wherein the permanent magnet comprises a protrusion protruding to the non-magnetic member.

### Claim 2 (depends on 1)

The motor of claim 1, wherein the stator comprises:
a core having the ring type structure;
a plurality of teeth protruding from an inner surface of the core; and
the coils wound around the teeth, respectively.

### Claim 3 (depends on 2)

The motor of claim 2, wherein the teeth are radially formed.

### Claim 4 (depends on 2)

The motor of claim 2, wherein the rotor comprises:
the non-magnetic member between the rotor and the rotation shaft;
a plurality of protrusions protruding from the non-magnetic member; and
a plurality of permanent magnets between the protrusions.

### Claim 5 (depends on 4)

The motor of claim 4, wherein the non-magnetic member has a ring shape.

### Claim 6 (depends on 5)

The motor of claim 5, wherein the non-magnetic member comprises a receiving groove to receive an end of the permanent magnet.

### Claim 7 (depends on 6)

The motor of claim 6, wherein a width of the receiving groove is gradually reduced toward the rotation shaft.

### Claim 8 (depends on 4)

The motor of claim 4, wherein a width of an end of the permanent magnet is gradually reduced toward the rotation shaft.

### Claim 9 (depends on 8)

The motor of claim 8, wherein the rotor comprises a protrusion protruding toward the non-magnetic member.

### Claim 10 (depends on 9)

The motor of claim 9, wherein the protrusion of the rotor is coupled with the non-magnetic member in a concavo-convex structure.

### Claim 11 (depends on 9)

The motor of claim 9, wherein the protrusion of the rotor comprises an expansion surface having a width gradually expanded toward the non-magnetic member.

### Claim 12 (depends on 11)

The motor of claim 11, wherein the non-magnetic member comprises a concave portion.

### Claim 13 (depends on 12)

The motor of claim 12, wherein the protrusion of the rotor is inserted into the concave portion of the non-magnetic member.