# US 12,191,717 B2 · Rotor with cooling fluid flow channels formed in permanent magnets

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- Number: US 12,191,717 B2
- Document ID: US12191717B2
- Status: Granted
- Kind: B2
- Application number: 17/657,976
- Filed: 2022-04-05
- Published: 2022-07-21
- Granted: 2025-01-07
- Earliest claimed: 2020-03-25
- Assignees: IHI Corporation
- Applicants: IHI Corporation
- Inventors: Fuminori Suzuki; Naoki Seki
- Web page: https://patentgrep.com/patent/US12191717B2

## CPC

- H02K 1/32: with channels or ducts for flow of cooling medium
- H02K 1/278: Surface mounted magnets; Inset magnets
- H02K 1/28: Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
- H02K 9/197: in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
- H02K 21/14: with magnets rotating within the armatures
- 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 of an electrical rotating device includes a rotor core, plural permanent magnets mounted on an outer circumference of the rotor core, a retaining sleeve that holds the permanent magnets from their outer side, a cooling fluid flow channel formed on each surface of the permanent magnets on a side of the retaining sleeve [or on each surface on a side of the rotor core], and a seal ring. The retaining sleeve is configured of plural divided sleeves divided along a direction of a rotation axis of the rotor. A seam is formed between adjacent divided sleeves in the plural divided sleeves. The seal ring covers the seam from an outer circumferential side [or an inner circumferential side].

## Claims

### Claim 1

A rotor of an electrical rotating device, the rotor comprising:
a rotor core;
a plurality of permanent magnets mounted on an outer circumference of the rotor core;
a retaining sleeve that is configured of a plurality of divided sleeves divided along a direction of a rotation axis of the rotor and holds the plurality of permanent magnets from an outer side of the plurality of permanent magnets;
a seam formed between adjacent divided sleeves in the plurality of divided sleeves;
a cooling fluid flow channel formed on each surface of the plurality of permanent magnets on a side of the retaining sleeve; and
a seal ring that covers the seam from an outer circumferential side or an inner circumferential side.

### Claim 2 (depends on 1)

The rotor of the electrical rotating device according to claim 1, wherein
the seam comprises one or more seams, and
the seal ring is a single hollow cylindrical member that covers all of the seams, and disposed between the retaining sleeve and the plurality of permanent magnets.

### Claim 3 (depends on 1)

The rotor of the electrical rotating device according to claim 1, wherein
the seam comprises one or more seams, and
the seal ring is a single hollow cylindrical member that covers all of the seams, and disposed on an outer circumferential face of the retaining sleeve.

### Claim 4 (depends on 1)

The rotor of the electrical rotating device according to claim 1, wherein
the seam comprises one or more seams, and
the seal ring is configured of a plurality of annular members which are aligned in the direction of the rotation axis and each of which covers at least one of the seams, and disposed on an outer circumferential face of the retaining sleeve.

### Claim 5 (depends on 1)

The rotor of the electrical rotating device according to claim 1, wherein
the seal ring is made of metal.

### Claim 6 (depends on 1)

The rotor of the electrical rotating device according to claim 1, wherein
the seal ring is made of CFRP.