Arrangement for the stator cooling of an electric motor

Patent metadata

Field	Value
Publication number	US-2016006302-A1
Application number	US-201514792125-A
Country	US
Kind code	A1
Filing date	Jul 6, 2015
Priority date	Jul 7, 2014
Publication date	Jan 7, 2016
Grant date	—

Abstract

Arrangement for the stator cooling of an electric motor, comprising a stator lamination package with a large number of axial stator laminations lined up axially, next to one another, and several axial winding grooves in the stator lamination package for the holding of corresponding stator windings. In accordance with the invention, a radial recess formed in one of the stator laminations leads into each of the winding grooves, wherein the radial recess communicates with a cooling liquid conduit provided on the stator lamination package for the delivery of cooling liquid.

First claim

What is claimed is:

1 . An electric motor comprising:
a plurality of stator windings; a stator lamination package including a plurality of stator laminations positioned axially next to one another; a plurality of axial grooves in the stator lamination package configured to hold the plurality of stator windings; and a cooling liquid conduit provided on the stator lamination package for the delivery of cooling liquid; wherein a radial recess is formed in one of plurality of the stator laminations, the radial recess leading into each of the plurality of axial grooves and in fluid communication with the cooling liquid conduit.

2 . The electric motor of claim 1 , wherein the radial recess comprises a one-sided groove-shaped indentation or as slot-shaped opening.

3 . The electric motor of claim 2 , further comprising an air gap;
wherein the plurality of axial grooves are partially sealed off by a corresponding sliding cover relative to the air gap such that a cooling liquid conducted in the winding grooves can leave, in a controlled manner, in the direction of the air gap.

4 . The electric motor of claim 3 , wherein the stator laminations are positioned next to one another in such a way that cooling liquid conducted in the winding grooves between the adjacent stator laminations can leave, in a controlled manner, in the direction of the air gap.

5 . The electric motor of claim 3 , wherein the stator laminations are connected liquid-tight with one another.

6 . The electric motor of claim 1 , further comprising a motor housing surrounding the stator lamination package;
wherein the cooling liquid conduit is formed as an axial groove-shaped liquid channel in an outer side of the stator lamination package; and wherein the groove-shaped liquid channel is sealed off by the motor housing.

7 . The electric motor of claim 6 , wherein in that the delivery of the cooling fluid into the axial groove-shaped liquid channel is carried out on a front side of the stator lamination package.

8 . The electric motor of claim 1 , wherein the one or more axial indentations and/or bulges are provided along an inner side of the plurality of axial grooves.

Assignees

• Deere & Co

Inventors

• Gugel Rainer
• Fritz Norbert
• Mueller David

Classifications

• H02K3/24 Primary

  with channels or ducts for cooling medium between the conductors · CPC title

• H02K1/20 Primary

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

• H02K9/19

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