Electric motor and method for producing such an electric motor

Patent metadata

Field	Value
Publication number	US-11223258-B2
Application number	US-201816491764-A
Country	US
Kind code	B2
Filing date	Feb 22, 2018
Priority date	Mar 8, 2017
Publication date	Jan 11, 2022
Grant date	Jan 11, 2022

Abstract

The invention relates to an electric motor comprising a rotor and a stator, the hollow cylindrical stator of which has a distributed winding consisting of multiple circumferential coil layers arranged one over the other in layers with a winding head. A temperature sensor for detecting a winding head temperature is arranged in the winding head. A dimensionally stable sensor receiving element with a functional section having a receiving area for the temperature sensor is provided which is added between two adjacent coil layers arranged one over the other such that the functional section is fixed in the winding head between the two coil layers that are spread apart by the introduction of the functional section and that the temperature sensor can be inserted into and removed from the receiving area through an opening arranged in a base section of the sensor receiving element, wherein the receiving area is delimited on one hand sectionally by the functional section and on the other hand sectionally by the winding. In addition, the invention relates to a method for producing an electric motor comprising a stator and a rotor.

First claim

What is claimed is:

1. An electric motor comprising a rotor and a stator, wherein the stator has a distributed winding consisting of multiple circumferential coil layers arranged one over the other in layers with a winding head and a temperature sensor for detecting a winding head temperature,
wherein a dimensionally stable sensor receiving element with a functional section having a receiving area for the temperature sensor is added between two adjacent coil layers arranged one over the other such that the functional section is fixed in the winding head between the two coil layers that are spread apart by an introduction of the functional section and that the temperature sensor can be inserted into and removed from the receiving area through an opening arranged in a base section of the sensor receiving element,
wherein the receiving area is delimited on one hand sectionally by the functional section and on the other hand sectionally by the winding.

2. The electric motor according to claim 1 ,
wherein the functional section of the sensor receiving element has at least one through hole,
wherein the receiving area for the temperature sensor is delimited in the region of the through hole by at least one of the two coil layers of the winding.

3. The electric motor according to claim 2 ,
wherein the functional section of the sensor receiving element has two through holes arranged diametrically opposite each other,
wherein the receiving area for the temperature sensor is delimited in the region of the two through holes by one of the two coil layers of the winding.

4. The electric motor according to claim 2 ,
wherein the functional section has two legs that are arranged diametrically, extend axially and sectionally delimit the receiving area, wherein the two legs are connected in an end region that faces away from the base section by a cross member,
wherein the receiving area is delimited in the region of the two through holes extending between the legs by one of the two coil layers of the winding.

5. The electric motor according to claim 2 , wherein the inner surfaces of the two legs that face toward the receiving area are concave.

6. The electric motor according to claim 2 , wherein the outer surfaces of the two legs that face away from the receiving area are convex and/or that an outer surface of the cross member connecting the two legs that faces away from the receiving area is convex.

7. The electric motor according to claim 1 ,
wherein the functional section of the sensor receiving element has two through holes arranged diametrically opposite each other,
wherein the receiving area for the temperature sensor is delimited in the region of the two through holes by one of the two coil layers of the winding.

8. The electric motor according to claim 7 ,
wherein the functional section has two legs that are arranged diametrically, extend axially and sectionally delimit the receiving area, wherein the two legs are connected in an end region that faces away from the base section by a cross member,
wherein the receiving area is delimited in the region of the two through holes extending between the legs by one of the two coil layers of the winding.

9. The electric motor according to claim 7 , wherein the inner surfaces of the two legs that face toward the receiving area are concave.

10. The electric motor according to claim 7 , wherein the outer surfaces of the two legs that face away from the receiving area are convex and/or that an outer surface of the cross member connecting the two legs that faces away from the receiving area is convex.

11. The electric motor according to claim 1 ,
wherein the functional section has two legs that are arranged diametrically, extend axially and sectionally delimit the receiving area, wherein the two legs are connected in an end region that faces away from the base section by a cross member,
wherein the receiving area is delimited in the region of the two through holes extending between the legs by one of the two coil layers of the winding.

12. The electric motor according to claim 11 , wherein the inner surfaces of the two legs that face toward the receiving area are concave.

13. The electric motor according to claim 11 , wherein the outer surfaces of the two legs that face away from the receiving area are convex and/or that an outer surface of the cross member connecting the two legs that faces away from the receiving area is convex.

14. The electric motor according to claim 1 , wherein the inner surfaces of the two legs that face toward the receiving area are concave.

15. The electric motor according to claim 14 , wherein the outer surfaces of the two legs that face away from the receiving area are convex and/or that an outer surface of the cross member connecting the two legs that faces away from the receiving area is convex.

16. The electric motor according to claim 1 , wherein the outer surfaces of the two legs that face away from the receiving area are convex and/or that an outer surface of the cross member connecting the two legs that faces away from the receiving area is convex.

17. The electric motor according to claim 1 ,
wherein the outer surface of each leg that faces away from the receiving area is formed by two guide surfaces that run radially towards each other,
wherein one of the two coil layers at least sectionally abuts each of the two guide surfaces of each leg.

18. The electric motor according to claim 1 , wherein the base section of the sensor receiving element has an insertion funnel that circumferentially encloses the opening for inserting and removing the temperature sensor.

19. The electric motor according to claim 1 , wherein an outer surface of the base section tapers conically in the direction of the functional section and at least sectionally abuts the end sections of the two coil layers that receive the functional section between them.

20. A method for producing an electric motor comprising a stator and a rotor according to claim 1 , wherein a temperature sensor for detecting the winding head temperature is arranged in a winding head of a distributed winding of the stator consisting of multiple circumferential coil layers arranged one over the other in layers,
wherein after introducing the coil layers into the stator and before introducing the temperature sensor into the winding head, a dimensionally stable sensor receiving element provided for receiving the temperature sensor and having an opening for inserting and removing the temperature sensor is added between two adjacent coil layers arranged one over the other by means of an auxiliary insertion element engaging in the opening, such that the two coil layers are spread apart and form a clamping force that fixes the sensor receiving element,
wherein the temperature sensor is placed through the opening into the receiving area of the sensor receiving element after the auxiliary insertion element has been removed from the opening.

Assignees

• Volkswagen Ag

Inventors

• Fuchs Martin
• Bahrmann Peter
• Wilhelm Nils

Classifications

• H02K15/20

  Shaping or compacting conductors or winding heads after the installation of the winding in the cores or machines; Applying fastening means on winding heads · CPC title

• G01K1/146

  arrangements for moving thermometers to or from a measuring position · CPC title

• H02K11/25 Primary

  Devices for sensing temperature, or actuated thereby · CPC title

• H02K3/50

  Fastening of winding heads, equalising connectors, or connections thereto · CPC title

• H02K15/0025

  Electricity · mapped topic