Rotating electrical machine utilizing cooling liquid supplied to coil end to cool other components

• US 10,454,344 B2
• Filed: 04/14/2016
• Issued: 10/22/2019
• Est. Priority Date: 04/17/2015
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Takahashi, Yuki
• Primary Examiner(s): Kim, John K
• Application Number:
  US15/098,436
• Publication Number:
  US 20160308414A1
• Time in Patent Office: 1,286 Days
• Field of Search: 310 52, 310 58, 310 59, 310 64
• CPC Class Codes: H02K 11/33 Drive circuits, e.g. power electronics H02K11/38 takes precedence
• CPC Class Codes: H02K 5/203 specially adapted for liquids, e.g. cooling jackets
• CPC Class Codes: H02K 9/19 for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil

Abstract

A rotating electric machine includes a housing, a rotating shaft rotatably supported by the housing, a rotor fixed on the rotating shaft, a stator and a cooling device. The stator includes a stator core located radially outside the rotor and a stator coil wound on the stator core so as to have a coil end protruding from an axial end face of the stator core. The cooling device is configured to supply cooling liquid to an upper part of the coil end of the stator coil. The housing has a cooling liquid-receiving portion located vertically under the upper part of the coil end of the stator coil so as to receive the cooling liquid falling down from the upper part of the coil end. In a space formed inside the cooling liquid-receiving portion of the housing, there is arranged at least one of an electrical component and a heat sink.

Claims

1. A rotating electric machine comprising:

a housing;

a rotating shaft rotatably supported by the housing;

a rotor fixed on the rotating shaft;

a stator including an annular stator core and a stator coil wound on the stator core, the stator core being located radially outside the rotor so as to radially face the rotor, the stator coil having a coil end protruding from an axial end face of the stator core; and

a cooling device configured to supply cooling liquid to an upper part of the coil end of the stator coil,

wherein

the rotating electric machine further comprises;

(a) an electrical component; and

(b) a heat sink provided for cooling the electrical component,

the housing includes a cylindrical wall that has a cooling liquid-receiving portion located vertically under the upper part of the coil end of the stator coil so as to receive the cooling liquid falling down from the upper part of the coil end, and

in a space formed inside the cylindrical wall of the housing, there is arranged the heat sink.

2. The rotating electric machine as set forth in claim 1, wherein the heat sink is provided integrally with the cylindrical wall of the housing so as to be in contact with the cylindrical wall.

3. The rotating electric machine as set forth in claim 1, wherein in the cooling liquid-receiving portion of the cylindrical wall of the housing, there is formed a guide groove by which the cooling liquid falling down from the upper part of the coil end onto the cooling liquid-receiving portion is guided so as to be distributed to both circumferential sides.

4. The rotating electric machine as set forth in claim 1, wherein the stator coil is formed of a plurality of electric conductor wires,

the coil end of the stator coil is constituted of end portions of the electric conductor wires which protrude from the axial end face of the stator core, and

the end portions of the electric conductor wires are substantially triangular ridge-shaped or stair-shaped.

5. The rotating electric machine as set forth in claim 1, wherein the heat sink is formed of a heat-conductive metal into the shape of a cuboid plate.