# US 2013/0278249 A1 · Rotating electric machine

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- Number: US 2013/0278249 A1
- Document ID: US20130278249A1
- Status: Published application
- Kind: A1
- Application number: 13/853,059
- Filed: 2013-03-29
- Published: 2013-10-24
- Earliest claimed: 2012-04-18
- Assignees: Kabushiki Kaisha Yaskawa Denki
- Applicants: Kabushiki Kaisha Yaskawa Denki
- Inventors: Ryuta KAGAWA; Kenji MATSUURA; Koji UEMURA
- Web page: https://patentgrep.com/patent/US20130278249A1

## CPC

- G01D 5/145: {influenced by the relative movement between the Hall device and magnetic fields (see G01R33/06)}
- F16D 3/04: specially adapted to allow radial displacement, e.g. Oldham couplings
- G01D 5/245: using a variable number of pulses in a train
- H02K 11/22: Optical devices
- G01D: MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A rotating electric machine according to the embodiments includes a rotating-electric-machine unit, a rotation detector, an Oldham coupling, and a washer. The rotating-electric-machine unit includes a shaft. The rotation detector includes a body and a rotation input pin that is rotatably provided on the body. The Oldham coupling couples the rotation input pin of the rotation detector and the shaft to each other while allowing any relative displacement in a direction intersecting an axial direction. The washer is provided on the rotating-electric-machine unit while being positioned with respect to the shaft. The washer includes an attaching portion at which the body of the rotation detector is attached to the washer.

## Claims

### Claim 1

A rotating electric machine comprising:
a rotating-electric-machine unit including a shaft;
a rotation detector including a body and a rotation input pin that is rotatably provided on the body;
an Oldham coupling that couples the rotation input pin of the rotation detector and the shaft to each other while allowing any relative displacement in a direction intersecting an axial direction; and
a washer provided on the rotating-electric-machine unit while being positioned with respect to the shaft, the washer including an attaching portion at which the body of the rotation detector is attached to the washer.

### Claim 2 (depends on 1)

The rotating electric machine according to claim 1,
wherein the body of the rotation detector includes
a disc having a predetermined pattern and that rotates together with the rotation input pin; and
a light-emitting element and a light-receiving element that are provided across the disc from each other, and
wherein the shaft has a larger diameter than the disc.

### Claim 3 (depends on 1)

The rotating electric machine according to claim 1,
wherein an attaching plane between the rotation input pin and the Oldham coupling is nearer to the shaft than an attaching plane between the washer and the body of the rotation detector.

### Claim 4 (depends on 3)

The rotating electric machine according to claim 3,
wherein an attaching plane between the shaft and the Oldham coupling is nearer to the rotation detector than an attaching plane between the washer and the rotating-electric-machine unit.

### Claim 5 (depends on 1)

The rotating electric machine according to claim 1,
wherein the washer is
a cylindrical member provided such that an inner circumference thereof is concentric with the shaft, the washer including, in one end face thereof in the axial direction, a region that is flat over the entirety of a periphery of the end face.