Stator comprising an integrated radiator

Patent metadata

Field	Value
Publication number	US-10186927-B2
Application number	US-201615167606-A
Country	US
Kind code	B2
Filing date	May 27, 2016
Priority date	May 28, 2015
Publication date	Jan 22, 2019
Grant date	Jan 22, 2019

Abstract

This electric motor includes a frame defining an internal volume and comprising a rotor and a stator, a primary cooling circuit comprising at least one primary conduit and in fluidic communication with the outside of the frame for circulating a gas stemming from the outside of the frame in the internal volume of the frame, a secondary cooling circuit extending in the internal volume of the frame and isolated from the outside of the frame, said secondary cooling circuit comprising at least one first cooling channel going through the rotor and at least one second cooling channel going through the stator, wherein it comprises at least one heat insulation channel interposed between the primary conduit of the primary cooling circuit and the second cooling channel of the secondary cooling circuit.

First claim

The invention claimed is:

1. An electric motor, comprising:
a frame defining an internal volume and comprising:
a rotor and a stator positioned in the internal volume of the frame,
a primary cooling circuit comprising at least one primary conduit going through the internal volume of the frame and in fluidic communication with the outside of the frame in order to circulate a gas coming from the outside of the frame into the internal volume of the frame,
a secondary cooling circuit extending in the internal volume of the frame and isolated from the outside of the frame, said secondary cooling circuit comprising at least one first cooling channel going through the rotor and at least one second cooling channel going through the stator,
at least one heat insulation channel interposed between the primary conduit of the primary cooling circuit and the second cooling channel of the secondary cooling circuit;

wherein:
the primary conduit goes through the stator;
the heat insulation channel forms a heat barrier between the primary conduit and the second cooling channel of the secondary cooling circuit; and
the first cooling channel and the second cooling channel form a closed circuit and are in fluidic communication.

2. The electric motor according to claim 1 , wherein the heat insulation channel belongs to the primary cooling circuit.

3. The electric motor according to claim 1 , wherein the heat insulation channel belongs to the inner secondary cooling circuit.

4. The electric motor according to claim 1 , wherein the heat insulation channel at least partly surrounds at least the second cooling channel of the inner secondary cooling circuit.

5. The electric motor according to claim 1 , wherein the heat insulation channel is laid out as a blade and has a thickness perpendicular to an axis of rotation of less than the diameter of the primary conduit of the primary cooling circuit and the diameter of the second cooling channel of the secondary cooling circuit.

6. The electric motor according to claim 1 , wherein a radial fan is mounted on the shaft of the electric motor for accelerating a gas flow in the secondary cooling circuit.

7. The electric motor according to claim 6 , wherein the radial fan allows simultaneous acceleration of a gas flow in the primary cooling circuit and a gas flow in the secondary cooling circuit.

8. The electric motor according to claim 1 , wherein the primary cooling circuit communicating with the outside includes several primary conduits positioned at a periphery of the stator.

9. The electric motor according to claim 1 , wherein the secondary cooling circuit comprises several second cooling channels, said second cooling channels being grouped in at least one peripheral portion between an end of the stator and the primary cooling circuit communicating with the outside.

10. The electric motor according to claim 1 , wherein the primary cooling circuit and the secondary cooling circuit comprise a plurality of channels.

Assignees

• Alstom Transp Tech

Inventors

• Randria Andry
• Raguin Bruno
• Tripot Gérard
• Boualem Benali

Classifications

• H02K1/20 Primary

  with channels or ducts for flow of cooling medium · CPC title

• H02K9/16

  wherein the cooling medium circulates through ducts or tubes within the casing · CPC title

• H02K9/18

  wherein the external part of the closed circuit comprises a heat exchanger structurally associated with the machine casing · CPC title

• H02K9/06

  with fans or impellers driven by the machine shaft · CPC title

• H02K1/32 Primary

  with channels or ducts for flow of cooling medium · CPC title