# US 10,122,223 B2 · Axial gap motor

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- Number: US 10,122,223 B2
- Document ID: US10122223B2
- Status: Granted
- Kind: B2
- Application number: 15/102,571
- Filed: 2014-10-03
- Published: 2016-11-03
- Granted: 2018-11-06
- Earliest claimed: 2013-12-11
- Assignees: Dynax Corporation; National University Corporation Hokkaido University
- Applicants: Dynax Corporation; National University Corporation Hokkaido University
- Inventors: Kenichi Takezaki; Wataru Hino; Koji Harada; Masatsugu Takemoto; Satoshi Ogasawara
- Web page: https://patentgrep.com/patent/US10122223B2

## CPC

- H02K 1/02: characterised by the magnetic material
- H02K 1/27: Rotor cores with permanent magnets
- H02K 1/2796: where both axial sides of the rotor face a stator
- H02K 21/24: with magnets axially facing the armatures, e.g. hub-type cycle dynamos
- H02K 16/04: Machines with one rotor and two stators
- 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

To reduce eddy current loss in a supporting member of a rotor of an axial gap motor, and improve efficiency, the motor includes a rotor, and stators arranged opposite to the rotor. The rotor has a disc-shaped supporting member, having a plurality of mounting holes in each of which a permanent magnet segment is installed. In the stators, a plurality of field windings is arranged for generating a rotating magnetic field. The axial gap motor is provided with notches extending radially between each of the mounting holes of the supporting member in which a permanent magnet segment is fitted, and an outer peripheral edge of the supporting member.

## Claims

### Claim 1

An axial gap motor having:
a rotor comprising a disc-shaped supporting member;
a plurality of permanent magnet segments, each being mounted in one of a plurality of mounting holes on said supporting member between a hub section and an outer peripheral section of said supporting member, the plurality of permanent magnet segments being spaced from one another circumferentially at a uniform pitch angle; and
a stator arranged on at least one side of the rotor, opposite to the rotor, with a predetermined gap between the stator and the rotor;
wherein a plurality of field windings for generating a rotating magnetic field is provided on the stator and parts of said field windings extend through radial slots formed in the stator, said slots being circumferentially spaced from one another at a uniform pitch angle;
wherein a radially extending notch is provided between each said mounting hole of the supporting member in which one of said permanent magnet segments is fitted,
and an outer peripheral edge of the supporting member;
wherein each said radially extending notch is in the form of a dent in a least one side of the supporting member such that the supporting member becomes thinner at the location of each said notch, and wherein a width dimension of each said notch in a direction transverse to the radial outward direction thereof is gradually narrowed, proceeding in a radially outward direction; and
wherein a rim member composed of a high-strength insulating material is provided on an outer peripheral section of the supporting member.

### Claim 2 (depends on 1)

The axial gap motor according to claim 1, wherein said high-strength insulating material is plastic reinforced with glass fiber, carbon-fiber or high-strength polymer fiber.