Stator housing for an electric machine, electric machine for a vehicle and vehicle

Patent metadata

Field	Value
Publication number	US-11515755-B2
Application number	US-201916692094-A
Country	US
Kind code	B2
Filing date	Nov 22, 2019
Priority date	Nov 29, 2018
Publication date	Nov 29, 2022
Grant date	Nov 29, 2022

Abstract

Stator housing for an electric machine, includes a plurality of axially extending main channels, wherein pairs of adjacent main channels are connected by deflection channels to form a meandering cooling path for a coolant, and a plurality of connection channels that connect each pair of adjacent main channels in a fluid conductive manner at an axial position between the deflection channels.

First claim

The invention claimed is:

1. A stator housing for an electric machine, comprising:
a plurality of axially extending main channels extending along an axial direction of the stator housing, and including
a first axially extending main channel,
a second axially extending main channel, and
a third axially extending main channel apart from the first axially extending main channel and the second axially extending main channel to form a first wall and a second wall therebetween;

a plurality of deflection channels alternatively arranged on two sides of the plurality of axially extending main channels in the axial direction of the stator housing, and including
a first deflection channel connecting the first axially extending main channel and the third axially extending main channel at one of two sides of the plurality of axially extending main channels, and
a second deflection channel connecting the second axially extending main channel and the third axially extending main channel at another of two sides of the plurality of axially extending main channels opposite to the one of two sides thereof,
the plurality of axially extending main channels and the plurality of deflection channels forming a S-shaped path for a coolant; and

a plurality of connection channels arranged between the plurality of deflection channels in the axial direction of the stator housing, and including
a first connection channel extending through the first wall between the first axially extending main channel and the third axially extending main channel to connect the first axially extending main channel and the third axially extending main channel in a fluid conductive manner, and
a second connection channel extending through the second wall between the second axially extending main channel and the third axially extending main channel to connect the second axially extending main channel and the third axially extending main channel in the fluid conductive manner.

2. A stator housing according to claim 1 , wherein each of the plurality of connection channels has a cross-sectional area smaller than that of each of the plurality of axially extending main channels.

3. A stator housing according to claim 2 , wherein the cross-sectional area of each of the plurality of connection channels is in a range of two percent to thirty percent of the cross-sectional area of each of the plurality of axially extending main channels.

4. A stator housing according to claim 1 , wherein the plurality of axially extending main channels and the plurality of connection channels are formed by a cavity in the stator housing.

5. A stator housing according to claim 4 , wherein sections of the cavity forming the plurality of axially extending main channels are separated by walls, respectively, and
the plurality of connection channels, each connecting two of the plurality of axially extending main channels adjacent to each other, is formed as grooves in the walls, respectively.

6. A stator housing according to claim 4 , further comprising an inner housing element and an outer housing element,
wherein the inner housing element is coaxially arranged inside the outer housing element.

7. A stator housing according to claim 6 , wherein the cavity is formed in one of the inner and outer housing elements.

8. A stator housing according to claim 7 , wherein the cavity is formed in the inner housing element and closed by the outer housing element, or
the cavity is formed in the outer housing element and closed by the inner housing element.

9. A stator housing according to claim 6 , wherein one of the inner and outer housing elements includes a first end shield of the stator housing and another of the inner and outer housing elements includes a second end shield of the stator housing.

10. An electric machine for a vehicle, comprising:
the stator housing according to claim 1 ; and
a stator arranged inside the stator housing.

11. A vehicle, comprising:
the electric machine according to claim 10 that is configured to drive the vehicle.

12. A stator housing according to claim 1 , wherein the first axially extending main channel and the second axially extending main channel are configured to flow the coolant in one direction and the third axially extending main channel is configured to flow the coolant in another direction opposite to the one direction.

13. A stator housing according to claim 1 , wherein a mass flow of the coolant bypassed through one of the plurality of connection channels connecting one and another of the plurality of axially extending main channels adjacent to each other is in a range of two percent to thirty percent of the mass flow of the coolant flowing through the one of the plurality of axially extending main channels.

14. A stator housing according to claim 1 , wherein each of the plurality of connection channels has a trapezoid cross-section.

15. A stator housing for an electric machine, comprising:
a plurality of axially extending main channels;
a plurality of deflection channels, each of the plurality of deflection channels connecting two of the plurality of axially extending main channels adjacent to each other to form a meandering cooling path for a coolant; and
a plurality of connection channels, each of the plurality of connection channels connecting two of the plurality of axially extending main channels adjacent to each other in a fluid conductive manner at a position between two of the plurality of deflection channels in an axial direction,
wherein the plurality of axially extending main channels and the plurality of connection channels are formed by a cavity in the stator housing,
sections of the cavity forming the plurality of axially extending main channels are separated by walls, respectively,
the plurality of connection channels, each connecting two of the plurality of axially extending main channels adjacent to each other, is formed as grooves in the walls, respectively, and
the sections of the cavity forming the plurality of axially extending main channels are deeper than the grooves, respectively.

Assignees

• Valeo Siemens Eautomotive Germany Gmbh

Inventors

• Krais Nils
• Söntgerath Philipp

Classifications

• H02K5/203 Primary

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

• H02K9/19 Primary

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