# US 8,786,154 B2 · Rotor core of motor

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- Number: US 8,786,154 B2
- Document ID: US8786154B2
- Status: Granted
- Kind: B2
- Application number: 13/483,884
- Filed: 2012-05-30
- Published: 2013-06-06
- Granted: 2014-07-22
- Earliest claimed: 2011-12-01
- Assignees: LG Innotek Co., Ltd.
- Applicants: Jinyong Kim
- Inventors: Jinyong Kim
- Web page: https://patentgrep.com/patent/US8786154B2

## CPC

- H02K 1/28: Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
- H02K 1/276: Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

Provided is a stacked rotor core of a motor, the rotor core including a thin disk-shaped rotor core member including a shaft hole extended to a direction of a rotation shaft, a key groove communicating with the shaft hole and a magnet, a shaft press-fitted into the shaft hole and concavely formed at a peripheral position corresponding to that of the key groove with a key accommodation groove, and at least one or more keys formed at the key groove and the key accommodation groove to restrict the rotor core member and the shaft.

## Claims

### Claim 1

A stacked rotor core of a motor, the rotor core comprising:
a thin disk-shaped rotor core member including a shaft hole extended to a direction of a rotation shaft, a key groove communicating with the shaft hole and a magnet;
a shaft press-fitted into the shaft hole and concavely formed at a peripheral position corresponding to that of the key groove with a key accommodation groove; and
at least one or more keys formed at the key groove and the key accommodation groove to restrict the rotor core member and the shaft;
wherein the rotor core member is formed at each distal cross-sectional end with a first magnet disengagement inhibition member and a second magnet disengagement inhibition member,
wherein the first magnet disengagement inhibition member includes a disk-shaped through hole corresponding to a diameter of the shaft, and at least one or more hook lugs protrusively formed at an inner side of the through hole to be hooked to a reception groove formed at a position corresponding to that of the shaft, and
wherein the hook lug is hooked by being rotated to a direction perpendicular to an axial direction after being inserted into the reception groove to the axial direction of the shaft.

### Claim 2 (depends on 1)

The stacked rotor core of claim 1, wherein the rotor core member includes a first rotor core stacked with a predetermined number of rotor core members to a direction of the rotation shaft and formed with a key groove at a first position, a second rotor core stacked with the same number of rotor core members as that of the first rotor core to a direction of the rotation shaft, and formed with the key groove at a second position having a predetermined angle difference from the first position, and a third rotor core stacked with the same number of rotor core members as that of the first rotor core to a direction of the rotation shaft, and formed with the key groove at a third position having a predetermined angle difference from the second position, wherein each key groove formed at the first, second and third rotor cores is arranged at a 120° angle.

### Claim 3 (depends on 2)

The stacked rotor core of claim 2, wherein each of the first, second and third rotor cores is formed with a key groove, the shaft is formed with a key accommodation groove at a position corresponding to the key groove provided at each of the first, second and third rotor cores, and the first, second and third rotor cores are restricted of relative rotation between the shaft and the rotor cores by each key.

### Claim 4 (depends on 2)

The stacked rotor core of claim 2, wherein the key is press-fitted into the key accommodation groove to a direction perpendicular to an axial direction of the rotation shaft, and press-fitted into the key accommodation groove to a direction parallel with an axial direction of the rotation shaft.

### Claim 5 (depends on 1)

The stacked rotor core of claim 1, wherein the key is press-fitted into a key insertion groove provided at the shaft.

### Claim 6 (depends on 1)

The stacked rotor core of claim 1, wherein the key groove is provided in a shape corresponding to a width of the key.

### Claim 7 (depends on 1)

The stacked rotor core of claim 1, wherein the key is formed with a round portion relative to insertion and disengagement directions of the rotor core member.

### Claim 8 (depends on 1)

The stacked rotor core of claim 1, wherein the second magnet disengagement inhibition member takes a shape of a disk, corresponds to a diameter of the shaft and is formed with a D-cut portion on at least one area.

### Claim 9 (depends on 1)

The stacked rotor core of claim 1, wherein the shaft includes the second magnet disengagement inhibition member and a flange unit supporting the rotor core member.

### Claim 10 (depends on 9)

The stacked rotor core of claim 9, wherein the rotor core further comprises a ring-shaped elastic member interposed between the flange unit and the second magnet disengagement inhibition member.