# US 2021/0344239 A1 · Motor

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- Number: US 2021/0344239 A1
- Document ID: US20210344239A1
- Status: Published application
- Kind: A1
- Application number: 17/273,103
- Filed: 2019-09-09
- Published: 2021-11-04
- Earliest claimed: 2018-09-18
- Assignees: LG Innotek Co., Ltd.
- Applicants: LG Innotek Co., Ltd.
- Inventors: Jung Kyu LEE
- Web page: https://patentgrep.com/patent/US20210344239A1

## CPC

- H02K 1/278: Surface mounted magnets; Inset magnets
- H02K 7/04: Balancing means
- H02K 21/16: having annular armature cores with salient poles (with homopolar co-operation H02K21/20)
- H02K 2201/06: Magnetic cores, or permanent magnets characterised by their skew
- H02K 2201/09: Magnetic cores comprising laminations characterised by being fastened by caulking
- 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

An embodiment relates to a motor comprising: a shaft; a rotor connected to the shaft; and a stator disposed outside the rotor, wherein the rotor includes N rotor cores, and the number of holes formed through each of the N rotor cores is at least 2N. Accordingly, the motor allows the rotor to have a skew angle by using the multiple holes formed through the rotor cores.

## Claims

### Claim 1

A motor comprising:
a shaft;
a rotor coupled to the shaft; and
a stator disposed outside the rotor,
wherein the rotor includes N rotor cores and a plurality of magnets disposed on an outer circumferential surface of each of the rotor cores, and
the number of holes, each of which is formed in one of the N rotor cores, is at least 2N.

### Claim 2 (depends on 1)

The motor of claim 1, wherein:
the 2N holes include a first group having N holes for arranging the rotor cores and a second group having N holes for balancing rotation of the rotor cores; and
first angles (θ1) formed between the N holes of the first group are the same.

### Claim 3 (depends on 2)

The motor of claim 2, wherein a second angle (θ2) formed by a first hole of the first group and the hole, which is closest to the first hole, of the second group is different from the first angle (θ1) of the first group.

### Claim 4 (depends on 3)

The motor of claim 3, wherein the first hole of the first group is a reference hole for arranging the rotor cores.

### Claim 5 (depends on 2)

The motor of claim 2, wherein the hole of the first group and the hole of the second group are symmetrical based on a center of the rotor core.

### Claim 6 (depends on 1)

The motor of claim 1, wherein:
each of the N rotor cores includes a plurality of guide protrusions formed on an outer circumferential surface of the rotor core; and
the guide protrusions of the N rotor cores do not overlap in a vertical direction.

### Claim 7 (depends on 2)

The motor of claim 2, wherein:
each of the N rotor cores includes a first rotor core and a second rotor core, each of which includes a plurality of guide protrusions; and
the first angle is greater than a third angle (θ3) formed by two guide protrusions, which are disposed adjacent to each other, of the plurality of guide protrusions formed on the first rotor core.

### Claim 8 (depends on 7)

The motor of claim 7, wherein the first angle (θ1) is a sum of the third angle (θ3) and an angle (θ4) formed by one of the guide protrusions of the first rotor core and the guide protrusion, which is closest to the one of the guide protrusions, of the second rotor core.

### Claim 9

A motor comprising:
a shaft;
a rotor coupled to the shaft; and
a stator disposed outside the rotor,
wherein the rotor includes a first rotor core, a second rotor core, and a third rotor core, each of which includes M holes spaced apart from each other,
the M holes include a first hole which is a reference hole, a second hole adjacent to the first hole, and a third hole adjacent to the second hole, and
the first hole of the first rotor core is disposed to overlap the second hole of the second rotor core and the third hole of the third rotor core in a vertical direction.

### Claim 10 (depends on 9)

The motor of claim 9, wherein the rotor further includes a pin disposed to pass through the first hole of the first rotor core, the second hole of the second rotor core, and the third hole of the third rotor core which are disposed to overlap in the vertical direction.

### Claim 11 (depends on 9)

The motor of claim 9, wherein each of the first rotor core and the second rotor includes a plurality of protrusions, and
two holes, which are adjacent to each other, of the holes of the first rotor core form a first angle (θ1) which is the same as a sum of an angle (θ3) formed by two guide protrusions, which are adjacent to each other, of the guide protrusions of the first rotor core and an angle (θ4) formed by the guide protrusion of the first rotor core and the guide protrusion, which is closest to the guide protrusion of the first rotor core in a circumferential direction, of the second rotor core around a center of the first rotor core.

### Claim 12

A motor comprising:
a shaft;
a rotor coupled to the shaft; and
a stator disposed outside the rotor,
wherein the rotor includes a plurality of rotor cores and a plurality of magnets disposed on an outer circumferential surface of each of the rotor cores,
each of the rotor cores includes first holes, second holes, and third holes,
two of the first holes, two of the second holes, and two of the third holes are disposed mutually opposite to each other based on a center (C) of the shaft,
a first angle (θ1) formed by one of the first holes and the second hole is the same as an angle formed by the second hole and the third hole around the center (C),
the plurality of rotor cores include a first rotor core, a third rotor core, and a second rotor core disposed between the first rotor core and the third rotor core, and
the first hole of the first rotor core, the second hole of the second rotor core, and the third hole of the third rotor core overlap in a shaft direction.

### Claim 13 (depends on 12)

The motor of claim 12, wherein, when the number of the magnets is six, a second angle (θ2) formed by the one of the first holes and the third hole which is disposed adjacent to the one of the first holes around the center (C) is smaller than the first angle (θ1).

### Claim 14 (depends on 13)

The motor of claim 13, wherein the first angle (θ1) is 66.67°.

### Claim 15 (depends on 12)

The motor of claim 12, wherein, when the number of the magnets is eight, a second angle (θ2) formed by the one of the first holes and the third hole which is disposed adjacent to the one of the first holes around the center (C) is greater than the first angle (θ1).

### Claim 16 (depends on 15)

The motor of claim 15, wherein the first angle θ1 is 50°.

### Claim 17 (depends on 12)

The motor of claim 12, wherein a sum of an angle formed by the first hole and the second hole, an angle formed by the second hole and the third hole, and the second angle θ2 is 180°.

### Claim 18 (depends on 12)

The motor of claim 12, wherein the first hole and the second hole are symmetrical based on a virtual line (L1) connecting a center of the third hole and a center (C) of the rotor core.

### Claim 19 (depends on 12)

The motor of claim 12, wherein the rotor further includes a pin disposed to pass through the first hole of the first rotor core, the second hole of the second rotor core, and the third hole of the third rotor core which are disposed to overlap in a vertical direction.

### Claim 20 (depends on 19)

The motor of claim 19, wherein the pin is provided as two pins.