# US 11,114,922 B2 · Rotor for an electric motor or generator

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- Number: US 11,114,922 B2
- Document ID: US11114922B2
- Status: Granted
- Kind: B2
- Application number: 16/327,388
- Filed: 2017-08-18
- Published: 2019-06-13
- Granted: 2021-09-07
- Earliest claimed: 2016-08-23
- Assignees: Protean Electric Limited
- Applicants: Protean Electric Limited
- Inventors: Christopher Tims
- Web page: https://patentgrep.com/patent/US11114922B2

## CPC

- H02K 11/215: Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements
- H02K 1/27: Rotor cores with permanent magnets
- H02K 1/2791: Surface mounted magnets; Inset magnets
- H02K 7/06: Means for converting reciprocating motion into rotary motion or vice versa
- H02K 11/33: Drive circuits, e.g. power electronics (H02K11/38 takes precedence)
- H02K 29/08: using magnetic effect devices, e.g. Hall-plates, magneto-resistors (H02K29/12 takes precedence)
- H02K 1/28: Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A rotor for an electric motor or generator, the rotor comprising a housing having a first surface on which a first set of magnets is mounted; and an annular clamping ring for retaining a second set of magnets to a second surface of the housing, wherein the position of the second set of magnets on the second surface allows the position of the first set of magnets to be determined, wherein the annular clamping ring includes a mounting point for allowing the annular clamping ring to be mounted to the housing for retaining the second set of magnets to the second surface, wherein the cross sectional area of the annular clamping ring is reduced in a region adjacent to the mounting point and wherein the annular clamping ring is mounted over the second set of magnets.

## Claims

### Claim 1

A rotor for an electric motor or generator, the rotor comprising a housing having a first surface on which a first set of magnets is mounted; and an annular clamping ring for retaining a second set of magnets to a second surface of the housing, wherein the position of the second set of magnets on the second surface allows the position of the first set of magnets to be determined, wherein the annular clamping ring includes a mounting point for allowing the annular clamping ring to be mounted to the housing for retaining the second set of magnets to the second surface, wherein the cross sectional area of the annular clamping ring is reduced in a region adjacent to the mounting point, wherein the annular clamping ring is mounted over the second set of magnets, and wherein the mounting point is an aperture, wherein a retaining element is inserted through the mounting aperture for retaining the annular clamping ring to the rotor housing.

### Claim 2 (depends on 1)

The rotor according to claim 1, wherein the housing includes a circumferential portion.

### Claim 3 (depends on 1)

The rotor according to claim 1, wherein the radial cross sectional area of the annular clamping ring is reduced in a region adjacent to the mounting point.

### Claim 4 (depends on 1)

The rotor according to claim 1, wherein the annular clamping ring includes a plurality of reduced cross sectional areas located adjacent to the mounting point.

### Claim 5 (depends on 1)

The rotor according to claim 1, wherein the annular clamping ring includes a plurality of mounting points having a reduced cross sectional area located adjacent to the respective mounting points.

### Claim 6 (depends on 1)

The rotor according to claim 1, wherein adhesive is located between the second set of magnets and the second surface of the rotor housing and between the second set of magnets and the annular clamping ring.