Electrical machine

Patent metadata

Field	Value
Publication number	US-11190063-B2
Application number	US-201816614648-A
Country	US
Kind code	B2
Filing date	May 18, 2018
Priority date	May 19, 2017
Publication date	Nov 30, 2021
Grant date	Nov 30, 2021

Abstract

An electrical machine may include a rotor rotatable about an axis of rotation which defines an axial direction, a stator including a plurality of stator windings, a coolant collector chamber, and a coolant distributor chamber fluidically communicating with the coolant collector chamber via at least one cooling duct. At least one stator winding may be embedded into a plastic compound composed of an electrically insulating plastic. The stator may further include a stator body having a space. The at least one cooling duct may be arranged in the stator body and may be at least partially defined by at least one aperture disposed in the stator body through which the coolant is flowable. The at least one aperture may open towards the space and may be closed in a fluid-tight manner via the plastic compound.

First claim

The invention claimed is:

1. An electrical machine, comprising:
a rotor rotatable about an axis of rotation which defines an axial direction;
a stator including a plurality of stator windings;
a coolant distributor chamber and a coolant collector chamber arranged at an axial distance from the coolant distributor chamber, the coolant distributor chamber, for cooling the plurality of stator windings, fluidically communicating with the coolant collector chamber via at least one cooling duct through which a coolant is flowable;
at least one stator winding of the plurality of stator windings, for thermally coupling, embedded into a plastic compound composed of an electrically insulating plastic;
the stator further including a stator body having a space;
wherein the at least one cooling duct is arranged in the stator body and is at least partially defined by at least one aperture disposed in the stator body through which the coolant is flowable;
wherein the at least one aperture opens towards the space and is closed in a fluid-tight manner via the plastic compound arranged in the space;
wherein the coolant distributor chamber is in fluid communication with the coolant collector chamber via a plurality of further cooling ducts arranged in the plastic compound;
wherein the plurality of further cooling ducts are disposed within a tube body surrounding a tube body internal space;
wherein at least one separating element is molded on the tube body and divides the tube body internal space into a plurality of fluidically separated spaces defining the plurality of further cooling ducts;
wherein the tube body is embedded in the plastic compound and is separated from the plurality of stator windings at least via an electrical insulation; and
wherein the electrical insulation is composed of an electrically insulating material and is arranged in the space.

2. The electrical machine according to claim 1 , wherein:
the stator body is ring-shaped and includes a plurality of stator teeth protruding therefrom;
the plurality of stator teeth extend along the axial direction, are arranged spaced apart from one another along a circumferential direction, and are configured to support the plurality of stator windings;
two adjacent stator teeth of the plurality of stator teeth define the space therebetween; and
the at least one stator winding is arranged in the space.

3. The electrical machine according to claim 2 , wherein the at least one cooling duct is arranged in the stator body in an area between the two adjacent stator teeth with respect to a circumferential direction.

4. The electrical machine according to claim 1 , wherein the at least one aperture has a rectangular geometry including two broad sides and two narrow sides in a cross section perpendicular to the axial direction.

5. The electrical machine according to claim 1 , wherein at least one of the coolant distributor chamber and the coolant collector chamber is at least partially arranged in the plastic compound and delimited by the plastic compound for thermal coupling to the at least one stator winding.

6. The electrical machine according to claim 1 , wherein the plastic compound protrudes axially from the space.

7. The electrical machine according to claim 1 , wherein at least in the space, the plastic compound is composed of a single plastic material.

8. The electrical machine according to claim 7 , wherein:
the stator body includes a plurality of stator teeth protruding therefrom, two adjacent stator teeth of the plurality of stator teeth defining the space therebetween; and
the at least one stator winding is arranged in the space and the electrical insulation is arranged in the space between the at least one stator winding and one of the two adjacent stator teeth.

9. The electrical machine according to claim 1 , wherein:
the stator body includes a plurality of stator teeth protruding therefrom;
the plurality of stator teeth define a plurality of spaces including the space; and
the plurality of further cooling ducts and the plastic compound are arranged in each of the plurality of spaces.

10. The electrical machine according to claim 1 , wherein the tube body is structured as a flat tube, and wherein at least one broad side of the flat tube extends essentially perpendicular to a radial direction in a cross section perpendicular to the axial direction.

11. The electrical machine according to claim 1 , wherein the plastic compound is arranged on an outer circumferential side of the stator body.

12. The electrical machine according to claim 1 , wherein:
the at least one stator winding protrudes axially from the space;
the plastic compound at least partially surrounds at least one winding section of the at least one stator winding and partially limits at least one of the coolant distributor chamber and the coolant collector chamber such that the at least one winding section is electrically insulated with respect to the coolant during operation.

13. The electrical machine according to claim 1 , wherein:
the at least one cooling duct includes a plurality of cooling ducts; and
the plurality of cooling ducts are disposed spaced apart from one another in a circumferential direction of the stator and extend parallel to one another along the axial direction.

14. The electrical machine according to claim 1 , wherein at least one of the coolant distributor chamber and the coolant collector chamber is exclusively arranged in at least one of (i) an axial extension of the stator body and (ii) an axial extension of the stator, adjacent thereto.

15. The electrical machine according to claim 1 , wherein the at least one stator winding is electrically insulated from the coolant and from the stator body at least in an area inside the space during operation.

16. The electrical machine according to claim 15 , wherein the at least one stator winding is electrically insulated from the stator body via at least one of (i) the plastic compound and (ii) the electrical insulation.

17. The electrical machine according to claim 1 , wherein:
the stator body includes a plurality of stator teeth protruding therefrom, two adjacent stator teeth of the plurality of stator teeth defining the space therebetween; and
the electrical insulation extends over an entire axial length of the space such that the electrical insulation insulates the at least one stator winding from the stator body and from the two adjacent stator teeth defining the space.

18. The electrical machine according to claim 17 , wherein the electrical insulation circumferentially surrounds the at least one stator winding inside the space over at least the entire axial length of the space.

19. The electrical machine according to claim 17 , wherein the at least one stator winding is electrically insulated from the plurality of further cooling ducts via at least one of the plastic compound and the electrical insulation.

20. A vehicle, comprising at least one electrical machine according to claim 1 .

21. The electrical machine according to claim 1 , wherein:
the at least one aperture includes a plurality of apertures disposed adjacent to one another along a circumferential direction;
the plurality of apertures open into the space through a radially inward facing surface of the stator body; and
the at least one cooling duct includes a plurality of cooling ducts defined by the plurality of apertures.

22. An electrical machine, comprising:
a rotor rotatable about an axis of rot

Assignees

• Mahle Int Gmbh

Inventors

• Hoerz Mirko
• Steurer Hans-Ulrich
• Sonntag Josef
• Markic Stojan
• Licen Andrej
• Medvescek Aleks
• Sever Peter
• Grabherr Philip

Classifications

• H02K9/227

  Heat sinks · CPC title

• H02K9/197

  in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator · CPC title

• H02K3/24

  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

• H02K5/1732 Primary

  radially supporting the rotary shaft at both ends of the rotor (H02K5/1737 takes precedence) · CPC title