Cooling channels in a high-density motor

Patent metadata

Field	Value
Publication number	US-2022320961-A1
Application number	US-202117223443-A
Country	US
Kind code	A1
Filing date	Apr 6, 2021
Priority date	Apr 6, 2021
Publication date	Oct 6, 2022
Grant date	—

Abstract

A stator includes a stator hub and a plurality of stator teeth extending from the stator hub that define a stator slot having a stator slot base. At least one winding is disposed in the stator slot and the stator also includes a back iron. The winding surrounds the back iron and is held apart from the stator slot base so that a fluid channel is defined between an inner winding portion of the at least one winding so fluid can be passed between the stator slot base and the inner winding portion to cool the inner winding portion.

First claim

What is claimed is:

1 . A stator comprising:
a stator hub; a plurality of stator teeth extending from the stator hub that define a stator slot having a stator slot base; at least one winding disposed in the stator slot; and a back iron; wherein the at least one winding surrounds the back iron and is held apart from the stator slot base so that a fluid channel is defined between an inner winding portion of the at least one winding so fluid can be passed between the stator slot base and the inner winding portion to cool the inner winding portion.

2 . The stator of claim 1 , wherein the winding is encased in a potting material.

3 . The stator of claim 2 , wherein the winding is formed of Litz wire.

4 . The stator of claim 1 , wherein the at least one winding includes a plurality of windings with each winding including an outer winding portion connected to an inner winding portion by end turns and the stator further includes:
one or more winding separators formed of insulating material and disposed between adjacent ones of outer winding portions.

5 . The stator of claim 4 , wherein the one or more winding separators include cooling passages formed therein.

6 . The stator of claim 5 , wherein the one or more winding separators include fins formed in the cooling passages thereof.

7 . The stator of claim 5 , further comprising insulators disposed between adjacent inner winding portions.

8 . The stator of claim 7 , wherein the insulators include fins that extend into the coolant channel.

9 . The stator of claim 1 , wherein the at least one winding includes 3, 5 or 3n windings where n is a whole number.

10 . The stator of claim 1 , wherein the stator slot includes walls and one or more fins extending from the tooth or the base into the coolant channel.

11 . The stator of claim 1 , in combination with an inlet header and outlet header that collectively provide fluid through the coolant channel.

12 . A method of cooling a stator as recited in claim 1 , the method comprising:
providing fluid into the coolant channel from inlet header; and removing fluid from the coolant channel via an outlet header.

13 . The method of claim 12 , wherein the at least one winding includes a plurality of windings with each winding including an outer winding portion connected to an inner winding portion by end turns and the stator further includes:
one or more winding separators formed of insulating material and disposed between adjacent ones of outer winding portions.

14 . The method of claim 13 , wherein the one or more winding separators include cooling passages formed therein, the method further comprising:
providing fluid into the cooling passages in the winding separators and removing the fluid from the cooling passages in the winding separators by separator cooling inlet and outlet headers.

15 . The method of claim 14 , wherein the separator cooling inlet and outlet headers are integrated with the inlet and outlet headers.

16 . The method of claim 12 , wherein the at least one winding includes a plurality of windings with each winding including an outer winding portion connected to an inner winding portion by end turns and the stator further includes:
one or more winding separators formed of insulating material and disposed between adjacent ones of outer winding portions; wherein the one or more winding separators include cooling passages formed therein; wherein the one or more winding separators includes a first winding separator and a second winding separator connected to one another by a manifold so that fluid entering the first winding separator is directed through the first winding separator in a first direction, through the manifold and into and through the second winding separator in a second direction.

17 . The method of claim 16 , wherein the first and second directions are opposite of another.

Assignees

• Hamilton Sundstrand Corp

Inventors

• Tangudu Jagadeesh Kumar
• Sur Aritra

Classifications

• H02K3/48

  in slots · CPC title

• H02K1/16

  Stator cores with slots for windings · CPC title

• H02K9/227

  Heat sinks · CPC title

• H02K9/19 Primary

  for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil · CPC title

• H02K3/12

  arranged in slots · CPC title