Electrical machine having defined positioning of various recesses in a wet-running stator

Patent metadata

Field	Value
Publication number	US-12155268-B2
Application number	US-202017641145-A
Country	US
Kind code	B2
Filing date	Aug 26, 2020
Priority date	Sep 10, 2019
Publication date	Nov 26, 2024
Grant date	Nov 26, 2024

Abstract

An electrical machine for driving a motor vehicle includes a housing, a stator, which is fixedly accommodated in the housing, and a rotor, which is mounted rotatably relative to the stator. The stator has a laminated core composed of a plurality of punched lamination segments and has a wire winding region connected to the laminated core. Each lamination segment has, on its radial exterior, at least one radial recess also created by means of the punching production. A coolant guide channel is delimited directly by an outer periphery of the laminated core. A recess of a first lamination segment is spaced apart, along the outer periphery, from a recess of a second lamination segment directly abutting the first lamination segment in such a way that the recess of the first lamination segment is at least partly axially covered by an end face of the second lamination segment.

First claim

The invention claimed is:

1. An electrical machine for driving a motor vehicle, comprising;
a housing,
a stator, which is fixedly accommodated in the housing, and
a rotor, which is mounted rotatably relative to the stator,
the stator having a laminated core composed of a plurality of punched lamination segments and having a wire winding region connected to the laminated core, and each lamination segment of the plurality of punched lamination segments having, on its radial exterior, at least one radial recess formed by punching production, and a coolant guide channel being delimited directly by an outer periphery of the laminated core,
wherein the plurality of punched lamination segments comprises a first lamination segment and a second lamination segment,
wherein the first lamination segment comprises a first radial recess nearest to a first though-hole, wherein the first radial recess is arranged at a first distance from the first through-hole along the outer periphery of the laminated core,
wherein the first lamination segment further comprises a second radial recess nearest to a second though-hole, and wherein the second radial recess is arranged at a second distance from the second through-hole along the outer periphery of the laminated core,
wherein the first lamination segment further comprises a third radial recess nearest to a third though-hole, wherein the third radial recess is arranged at a third distance from the third through-hole along the outer periphery of the laminated core,
wherein the first distance is different from the second distance, wherein the second distance is different from the third distance, and wherein the third distance is different from the first distance, and
wherein the first radial recess of the first lamination segment of the plurality of punched lamination segments is spaced apart, along the outer periphery, from a fourth radial recess of the second lamination segment of the plurality of punched lamination segments directly abutting the first lamination segment in such a way that the first radial recess of the first lamination segment is at least partly axially covered by an end face of the second lamination segment.

2. The electrical machine according to claim 1 , wherein at least one of the first lamination segment and the second lamination segment comprises a single individual lamination or a plurality of individual laminations stacked one on top of the other to form a partial stack.

3. The electrical machine according to claim 2 , wherein the individual laminations of the lamination segments are designed as identical parts, wherein the individual lamination of the first lamination segment is rotated relative to the individual lamination of the second lamination segment.

4. The electrical machine according to claim 1 , wherein the end face of the second lamination segment is a second end face, wherein a third lamination segment of the plurality of punched lamination segments likewise provided with a fifth radial recess is present, which abuts on an axial side of the first lamination segment facing away from the second lamination segment, wherein the fifth radial recess of the third lamination segment is spaced apart along the outer periphery relative to the first radial recess of the first lamination segment such that the first radial recess of the first lamination segment is axially covered by a third end face of the third lamination segment.

5. The electrical machine according to claim 4 , wherein the third lamination segment comprises a single individual lamination or a plurality of individual laminations stacked one on top of the other to form a partial stack.

6. The electrical machine according to claim 4 , wherein the first radial recess of the first lamination segment has a greater distance along the outer periphery to the first through-hole nearest thereto than the fifth radial recess of the third lamination segment.

7. The electrical machine according to claim 1 , wherein each lamination segment of the plurality of punched lamination segments is provided with a plurality of recesses distributed along the outer periphery, wherein each recess of a respective lamination segment is arranged along the outer periphery spaced apart from individual recesses of an adjacent lamination segment.

8. The electrical machine according to claim 1 , wherein a plurality of through-holes distributed along the periphery is provided in the laminated core, wherein the plurality of through-holes comprises the first through-hole, the second through-hole, and the third through-hole, wherein the first radial recess of the first lamination segment has a greater distance along the outer periphery from the first through-hole than the fourth radial recess of the second lamination segment.

9. The electrical machine according to claim 1 , wherein more than three lamination segments are present.

10. The electrical machine according to claim 1 , wherein a radial recess of a respective lamination segment has a depth that measures less than 60% of its width.

Assignees

• Schaeffler Technologies Ag

Inventors

• Marsetz Michael
• Ludwig Christian

Classifications

• H02K9/19

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

• B60K2001/006

  the electric motors · CPC title

• B60K1/00

  Arrangement or mounting of electrical propulsion units (B60K7/00 takes precedence; arrangement or mounting of plural diverse prime-movers for mutual or common propulsion B60K6/00) · CPC title

• H02K5/20

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

• H02K1/20 Primary

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