# US 2018/0323667 A1 · Rotor core, rotor, and motor including same

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- Number: US 2018/0323667 A1
- Document ID: US20180323667A1
- Status: Published application
- Kind: A1
- Application number: 15/770,055
- Filed: 2016-10-18
- Published: 2018-11-08
- Earliest claimed: 2015-10-20
- Assignees: LG Innotek Co., Ltd.
- Applicants: LG Innotek Co., Ltd.
- Inventors: MYOUNG SEOK LEE
- Web page: https://patentgrep.com/patent/US20180323667A1

## CPC

- H02K 1/2753: the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K 1/17: Stator cores with permanent magnets
- H02K 1/185: {to outer stators}
- H02K 1/24: Rotor cores with salient poles {; Variable reluctance rotors}
- H02K 1/27: Rotor cores with permanent magnets
- H02K 1/276: Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K 1/2781: Magnets shaped to vary the mechanical air gap between the magnets and the stator
- H02K 3/345: {between conductor and core, e.g. slot insulation}
- H02K 15/095: by laying conductors around salient poles
- H02K 15/13: Applying slot closure means in the cores; Manufacture of slot closure means
- H02K 15/03: having permanent magnets
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

The present invention provides a rotor core, which comprises a plurality of grooves formed at the same interval along the circumferential direction, wherein the number of the grooves is an integer multiple of the least common multiple of commonly used pole number.

## Claims

### Claim at position 1

1-2. (canceled)

### Claim 3

A rotor comprising:
a rotor core comprising a plurality of grooves formed at regular intervals in a circumferential direction, wherein the number of the grooves is an integer multiple of the least common multiple of numbers of common poles; and
a plurality of magnets separated by reference grooves among the plurality of grooves and disposed on an outer circumferential surface of the rotor core.

### Claim 4 (depends on 3)

The rotor of claim 3, wherein the number of the reference grooves is the number of the magnets, and the plurality of reference grooves are disposed at regular intervals in the circumferential direction.

### Claim 5 (depends on 4)

The rotor of claim 4, further comprising a protector configured to surround the magnets and coupled to the reference groove.

### Claim 6 (depends on 5)

The rotor of claim 5, wherein the protector comprises a rim in contact with an outer surface of the magnet and arms formed on the rim to protrude inward and positioned between the adjacent magnets to be coupled to the reference grooves.

### Claim 7 (depends on 6)

The rotor of claim 6, wherein the arm is in contact with a side surface of the magnet.

### Claim 8 (depends on 4)

The rotor of claim 4, wherein, among the grooves, the groove disposed between the reference grooves is an adhesive receiving groove.

### Claim 9

A motor comprising:
a rotational shaft;
a rotor having a hole in which the rotational shaft is disposed; and
a stator disposed at an outer side of the rotor,
wherein the rotor comprises a rotor core coupled to the rotational shaft and magnets disposed on an outer circumferential surface of the rotor core,
the rotor core comprises a plurality of grooves formed at regular intervals in a circumferential direction, and the number of the grooves is an integer multiple of the least common multiple of target numbers of common poles, and
the magnets are separated and disposed by reference grooves among the plurality of grooves.

### Claim 10 (depends on 9)

The motor of claim 9, wherein the number of the reference grooves is the number of the magnets, and the plurality of reference grooves are disposed at regular intervals in a circumferential direction.

### Claim 11 (depends on 6)

The rotor of claim 6, wherein the arms comprises a body and a tip portion, and the arm fixes the magnet in a state in which the body is in contact with a side surface of the magnet, and the tip portion formed at an end of the body is inserted into and coupled to the reference groove so as to couple the protector to the rotor core.