# US 12,009,732 B2 · Electrical machine winding having improved cooling

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,009,732 B2
- Document ID: US12009732B2
- Status: Granted
- Kind: B2
- Application number: 17/432,245
- Filed: 2020-02-19
- Published: 2022-06-16
- Granted: 2024-06-11
- Earliest claimed: 2019-02-21
- Assignees: Safran; Safran Helicopter Engines
- Applicants: Safran; Safran Helicopter Engines
- Inventors: Sabrina Ayat; Camel Serghine; Thomas Klonowski
- Web page: https://patentgrep.com/patent/US12009732B2

## CPC

- H02K 3/24: with channels or ducts for cooling medium between the conductors
- H02K 9/20: wherein the cooling medium vaporises within the machine casing
- H02K 9/225: {Heat pipes}
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

An assembly including a winding and a cooler in contact with conductors of the winding, the cooler including a container forming a heat dissipator and including a phase change material having the ability to absorb a surplus quantity of heat when the conductors of the winding are subject to an increase in their current density and the heat dissipator is composed of at least two hollow parts separate and nestable with one another and intended to house the phase change material.

## Claims

### Claim 1

An assembly comprising a stator, wherein the stator includes a plurality of teeth protruding from the stator such that each of the plurality of teeth forms a cooler in contact with conductors of a winding, the winding being formed from a plurality of conductors having a coil body and coil heads, the cooler comprising a container forming a heat dissipator and comprising a phase change material having the ability to absorb a surplus quantity of heat when the conductors of the winding are subject to an increase in their current density, wherein the heat dissipator is composed of at least two hollow parts separate and nestable with one another and intended to house the phase change material and wherein the heat dissipator is interposed between the coil body and the coil heads.

### Claim 2 (depends on 1)

The assembly as claimed in claim 1, wherein the phase change material has a phase change temperature between 100° C. and 300° C.

### Claim 3 (depends on 1)

The assembly as claimed in claim 1, wherein the phase change material is a nitrate or a hydroxide perferably filled with graphite.

### Claim 4 (depends on 1)

The assembly as claimed in claim 1, wherein the heat dissipator is made of an electrically insulating and thermally conductive material having a thermal conductivity greater than 10 W/(m·K).

### Claim 5 (depends on 1)

The assembly as claimed in claim 1, wherein, when the heat dissipator is made of an electrically conductive material, an electrically insulating and thermally conductive material is disposed between the conductors and the heat dissipator.

### Claim 6 (depends on 4)

The assembly as claimed in claim 4, wherein the electrically insulating and thermally conductive material is alumina or alumide.

### Claim 7 (depends on 1)

The assembly as claimed in claim 1, wherein the heat dissipator is in direct contact with a casing to allow the transfer of heat by conduction toward the outside before or after the phase change of the phase change material.

### Claim 8 (depends on 1)

The assembly as claimed in claim 1, wherein the dissipator includes outer fins to provide the insulation between the conductors or inner fins for better transfer of heat within the phase change material.

### Claim 9 (depends on 1)

The assembly as claimed in claim 1, wherein the container forms a mold covering the conductors of the winding and embedding them in the phase change material.

### Claim 10 (depends on 1)

An element of an electrical machine, transformer or inductor or an electrical machine, transformer or inductor comprising the assembly as claimed in claim 1.

### Claim 11 (depends on 1)

The assembly as claimed in claim 1, wherein the phase change material is a nitrate or a hydroxide filled with graphite.

### Claim 12 (depends on 1)

The assembly as claimed in claim 1, wherein the coil heads include an inner periphery surface, an inner radial surface, and an outer peripheral surface such that the inner periphery surface is positioned adjacent to a portion of the heat dissipator that houses the phase change material, and the inner radial surface and the outer peripheral surface are in contact with walls of the heat dissipator.