# US 10,312,758 B2 · Holding member, rotor of a rotating electrical machine comprising the same, and a rotating electrical machine comprising the rotor

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- Number: US 10,312,758 B2
- Document ID: US10312758B2
- Status: Granted
- Kind: B2
- Application number: 15/487,911
- Filed: 2017-04-14
- Published: 2017-10-26
- Granted: 2019-06-04
- Earliest claimed: 2016-04-22
- Assignees: Fanuc Corporation
- Applicants: Fanuc Corporation
- Inventors: Youhei Arimatsu; Shinobu Takano
- Web page: https://patentgrep.com/patent/US10312758B2

## CPC

- H02K 1/28: Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
- H02K 1/278: Surface mounted magnets; Inset magnets
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

To provide a holding member, a rotor including the holding member, and a rotating electrical machine including the rotor, in which there is no risk of the holding member grinding against the stator, while maintaining a sufficient tensile force of the holding member for the magnet in the rotor of the rotating electrical machine. The length of the main section in the axial direction is longer than the length of the stator core in the axial direction; and the terminally processed section is arranged so as to be located outside of the end of the stator core in the axial direction; the terminally processed section is the start point and the end point of winding the fiber bundle composing the holding member, and is located outside of the stator core; and the terminally processed section is relatively thick.

## Claims

### Claim 1

A holding member applied to a rotating electrical machine, the rotating electrical machine comprising: a stator including a stator core; a rotor supported by way of a rotating shaft and corresponding to the stator; a plurality of magnets arranged on an outer periphery of the rotor; and a holding member that compressively holds the magnets inwards in a radial direction from an outer periphery side of the magnets,
wherein the holding member comprises: a main section that forms a substantially cylindrical body and is composed primarily of a fiber bundle wound on, as circling around, a peripheral surface of the main section per se; and a terminally processed section provided at an end of the main section, the terminally processed section including a region that is terminally processed for preventing the fiber bundle from being untied from at least any one of a start point and an end point of winding the fiber bundle, and
wherein a length of the main section in an axial direction is longer than a length of the stator core in the axial direction; and the terminally processed section is arranged so as to be located outside of an end of the stator core in the axial direction, wherein
an external diameter of the terminally processed section, formed on an end portion extended from the main section, is larger than an external diameter of the main section, and wherein
an external diameter of an opposite side end portion, oppositely extended from the main section in the axial direction, is smaller than an inner diameter of the stator core, wherein the opposite side end portion is formed without the terminally processed section.

### Claim 2 (depends on 1)

A rotor comprising the holding member according to claim 1.

### Claim 3 (depends on 2)

The rotor according to claim 2, wherein a length of the holding member in the axial direction is equal to a length of the magnets in the axial direction.

### Claim 4 (depends on 3)

A rotating electrical machine comprising the rotor according to claim 3, wherein an end of the stator core composes a section configured with a countermeasure to prevent a laminated core from peeling off.

### Claim 5 (depends on 2)

The rotor according to claim 2, wherein an outer periphery of the rotating shaft coaxially comprises: the holding member configured to include carbon fiber; and a tapered sleeve located further inwards in relation to the holding member in a radial direction, the tapered sleeve including a tapered surface, an inner periphery of which is sloped in the axial direction, wherein the holding member receives a radially expanding force from the tapered surface on the outer periphery of the rotating shaft, the holding member is fitted to the rotating shaft via the magnets and the tapered sleeve, whereby a tensile force acts on the holding member; and the tensile force generates an elastically compressive force, which in turn presses the magnets against the outer periphery of the tapered sleeve.

### Claim 6 (depends on 2)

A rotating electrical machine comprising the rotor according to claim 2, wherein the terminally processed section of the holding member is located outside of an end of the stator core in the axial direction.