# US 10,871,331 B2 · Cooling device and motor utilizing a heating element to circulate cooling

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- Number: US 10,871,331 B2
- Document ID: US10871331B2
- Status: Granted
- Kind: B2
- Application number: 15/750,503
- Filed: 2016-07-28
- Published: 2018-08-16
- Granted: 2020-12-22
- Earliest claimed: 2015-08-06
- Assignees: Nidec Corporation; National University Corporation Yokohama National University
- Applicants: Nidec Corporation; National University Corporation YOKOHAMA National University
- Inventors: Quing Yu; Tatsuya Noda; Shunichi Tanaka; Yoshinobu Nakamura; Masato Nakanishi
- Web page: https://patentgrep.com/patent/US10871331B2

## CPC

- F28D 15/0233: {the conduits having a particular shape, e.g. non-circular cross-section, annular (F28D15/0241, F28D15/0266 take precedence)}
- F28D 15/02: in which the medium condenses and evaporates, e.g. heat pipes {(heat pipes used in solar heat collectors F24S10/95; in radiators F28D1/0226; in nuclear reactors G21C15/257)}
- F28D 15/0241: {the tubes being flexible}
- F28D 15/0266: {with separate evaporating and condensing chambers connected by at least one conduit; Loop-type heat pipes; with multiple or common evaporating or condensing chambers (F28D15/043 takes precedence)}
- F28F 3/086: {having one or more openings therein forming tubular heat-exchange passages}
- H02K 5/203: {specially adapted for liquids, e.g. cooling jackets}
- H02K 9/225: {Heat pipes}
- F28D 2015/0291: {comprising internal rotor means, e.g. turbine driven by the working fluid}
- F28D 2021/0028: {for cooling heat generating elements, e.g. for cooling electronic components or electric devices}
- F28D 2021/004: {for engine or machine cooling systems}
- F28F 2265/12: for preventing overpressure
- F28F 2265/14: for preventing damage by freezing, e.g. for accommodating volume expansion
- F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general)
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A cooling device and a motor are provided. The cooling device that cools a heating element is provided with: a cooling chamber for cooling the heating element with a first cooling medium; a radiator chamber for releasing the heat of the first cooling medium to the outside; and a first connection path and a second connection path for connecting the cooling chamber and the radiator chamber. When part of the first cooling medium in the cooling chamber is gasified, at least part of the gasified first cooling medium moves into the first connection path, thus causing a circulation in which the first cooling medium in the cooling chamber flows into the radiator chamber via the first connection path, and the first cooling medium in the radiator chamber flows into the cooling chamber via the second connection path.

## Claims

### Claim 1

A motor, comprising:
a cooling device configured to cool a heating element, the cooling device comprising:
a cooling chamber, cooling the heating element by a first cooling medium;
a radiator chamber, releasing heat of the first cooling medium to an outside; and
a first connection path and a second connection path, connecting the cooling chamber to the radiator chamber,
wherein at least a part of the radiator chamber is positioned above the cooling chamber in a vertical direction,
wherein a part in which the first connection path is connected to the radiator chamber is positioned at a same part in which the first connection path is connected to the cooling chamber in the vertical direction or is positioned above a part in which the first connection path is connected to the cooling chamber, and
when a part of the first cooling medium in the cooling chamber is vaporized, at least a part of the first cooling medium which is vaporized moves into the first connection path, and
a circulation is generated in which the first cooling medium in the cooling chamber flows to the radiator chamber through the first connection path, and the first cooling medium in the radiator chamber flows into the cooling chamber through the second connection path,
a rotor, including a shaft centered on a central axis that extends in one direction; and
a stator, being positioned outward from the rotor in a radial direction,
wherein the stator includes a stator core and a coil that excites the stator core,
the heating element is the coil,
the first cooling medium has an insulation property,
the coil is housed in the cooling chamber,
the cooling device includes a plurality of the cooling chambers,
wherein the stator includes a plurality of the coils,
wherein the cooling chamber includes a first cooling chamber and a second cooling chamber that is positioned below the first cooling chamber in the vertical direction,
wherein the first connection path and the second connection path connected to the second cooling chamber are connected to the radiator chamber to which the first cooling chamber is connected, and
the stator includes an insulator of which at least a part is positioned between the stator core and the coil, and
the insulator includes the cooling chamber.

### Claim 2 (depends on 1)

The motor according to claim 1, wherein
the insulator comprising:
an insulator main body;
a first connection path member which is attached to the insulator main body and includes at least a part of the first connection path; and
a second connection path member which is attached to the insulator main body and includes at least a part of the second connection path,
wherein the first connection path member and the second connection path member are members that are separate from the insulator main body.

### Claim 3 (depends on 1)

The motor according to claim 1, comprising:
a heat absorbing part in which a second cooling medium is housed and which absorbs heat from the first cooling medium in the radiator chamber.