Electrical machines

Patent metadata

Field	Value
Publication number	US-2021135516-A1
Application number	US-202017088832-A
Country	US
Kind code	A1
Filing date	Nov 4, 2020
Priority date	Nov 5, 2019
Publication date	May 6, 2021
Grant date	—

Abstract

A stator assembly for an electrical machine comprises an annular core extending around an axis (X) and comprising a plurality of axially extending slots. A plurality of electrical windings are arranged in the slots and have end portions arranged at the axial ends of the core. A cooling jacket at least partially extends around a radially outer surface of the core. At least one annular cooling plate is mounted to an axial end of the cooling jacket and arranged in thermal contact with the end portions of the electrical windings.

First claim

1 . A stator assembly for an electrical machine, the stator assembly comprising:
an annular core extending around an axis (X) and comprising a plurality of axially extending slots; a plurality of electrical windings arranged in the slots and having end portions arranged at the axial ends of the core; and at least one annular cooling plate mounted at an axial end of the core and arranged in thermal contact with axially outwardly facing end surfaces of the end portions of the electrical windings.

2 . The stator assembly of claim 1 , further comprising a cooling jacket at least partially extending around a radially outer surface of the core, the at least one annular cooling plate being mounted to an axial end of the cooling jacket

3 . The stator assembly of claim 1 , comprising a respective cooling plate provided at each axial end of the stator.

4 . The stator assembly of claim 1 , wherein the at least one cooling plate is arranged in direct thermal contact with the end portions of the electrical windings.

5 . The stator assembly of claim 1 , wherein the at least one cooling plate comprises a cooling passage configured to carry a cooling fluid.

6 . The stator assembly of claim 5 , wherein the at least one cooling plate comprises a base element defining a groove and a cover attached to the base element for closing the groove to form the cooling passage.

7 . The stator assembly of claim 1 , wherein the at least one cooling plate comprises heat transfer enhancement features which extend into the cooling passage, optionally extending completely across the cooling passage.

8 . The stator assembly of claim 7 , wherein the heat transfer enhancement features comprise ribs and/or pin fins, wherein optionally the pin fins comprise a square, rectangular, diamond shaped, oval or teardrop cross-section.

9 . The stator assembly of claim 5 , wherein the at least one cooling plate comprises at least one cooling fluid inlet and at least one cooling fluid outlet, and wherein, optionally, the at least one fluid inlet is located on a diametrically opposite side of the at least one cooling plate from the at least one fluid outlet.

10 . The stator assembly of claim 1 , wherein the at least one cooling plate is formed from aluminium.

11 . The stator assembly of claim 1 , wherein the at least one cooling plate is removably mounted stator assembly, for example to the cooling jacket, for example via a fastener for example a threaded fastener.

12 . A method of assembling a stator assembly for an electrical machine, the stator assembly comprising an annular core extending around an axis (X) and comprising a plurality of axially extending slots; and a plurality of electrical windings arranged in the slots and having end portions at axial ends of the core ; the method comprising:
mounting at least one annular cooling plate at an axial end of the core and in thermal contact with axially facing surfaces of the end portions of the electrical windings.

13 . The method of claim 12 , wherein attaching the at least one cooling plate at an axial end of the core comprises mounting the cooling plate to a cooling jacket which at least partially extends around a radially outer surface of the core, optionally removably attaching the cooling plate to the cooling jacket for example using threaded fasteners.

14 . The method of claim 12 , further comprising leak testing and/or electrically testing the assembled stator assembly after attaching the at least one cooling plate to the stator assembly.

15 . The method of claim 12 , further comprising removing the at least one cooling plate to carry out maintenance on the stator assembly.

16 . The method of claim 13 , further comprising removing the at least one cooling plate to carry out maintenance on the stator assembly.

17 . The method of claim 14 , further comprising removing the at least one cooling plate to carry out maintenance on the stator assembly.

Assignees

• Hamilton Sundstrand Corp

Inventors

• Page Andrew E
• Sawata Tadashi
• Gerada David
• Golovanov Dmitry
• Xu Zeyuan

Classifications

• H02K9/19

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

• H02K5/203

  specially adapted for liquids, e.g. cooling jackets · CPC title

• H02K5/20 Primary

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

• H02K9/22

  by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges · CPC title

• H02K1/20 Primary

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