Electrical machine

Patent metadata

Field	Value
Publication number	US-11777352-B2
Application number	US-201816614797-A
Country	US
Kind code	B2
Filing date	May 18, 2018
Priority date	May 19, 2017
Publication date	Oct 3, 2023
Grant date	Oct 3, 2023

Abstract

An electrical machine for a vehicle may include a rotor, a stator, a coolant distributor chamber and a coolant collector chamber. The rotor may be configured to be rotated about an axis of rotation defining an axial direction of the electrical machine. The stator may include a plurality of stator windings. The coolant collector chamber may be axially arranged at a distance from the coolant distributor chamber. The coolant distributor chamber may be configured to communicate fluidically with the coolant collector chamber by at least one cooling channel through which a coolant can flow. At least one of the stator windings may be embedded in at least one plastic mass consisting of an electrically insulating plastic for thermal coupling to the coolant. At least one of the coolant distributor chamber and the coolant collector chamber may be arranged at least partially in the at least one plastic mass.

First claim

The invention claimed is:

1. An electrical machine, comprising:
a rotor, which can be rotated about an axis of rotation, which defines an axial direction of the electrical machine,
a stator, which has stator windings,
a coolant distributor chamber, and
a coolant collector chamber, which is arranged at an axial distance to said coolant distributor chamber, wherein the coolant distributor chamber communicates fluidically with the coolant collector chamber by at least one cooling duct, through which a coolant can flow,
wherein at least one of the stator windings is for thermally coupling to the coolant is embedded into a plastic compound of an electrically insulating plastic,
wherein at least one of the coolant distributor chamber and the coolant collector chamber is at least partially arranged in the plastic compound for the thermal coupling to the at least one of the stator windings,
wherein a longitudinal section of at least one of the coolant distributor chamber and the coolant collector chamber surrounds, in a U-shaped or C-shaped manner, a first or second end section of the at least one stator winding,
wherein the plastic compound at least surrounds and embeds the first or second end section of the at least one stator winding to electrically insulate the first or second end section from the coolant in the at least one of the coolant distributor chamber and the coolant collector chamber,
wherein the stator has stator teeth that extend along the axial direction and are arranged spaced apart from one another along a circumferential direction of the rotor to define an intermediate space, the intermediate space comprising a first subspace in which the at least one stator winding is arranged, and a second subspace in which the at least one cooling duct is arranged, and
a fixing device disposed in the intermediate space between the first subspace and the second subspace for fixing the at least one cooling duct in the second subspace, the fixing device including two protrusions disposed on the two stator teeth, wherein the two protrusions face one another in the circumferential direction and project into the intermediate space for fixing the at least one cooling duct.

2. The electrical machine according to claim 1 , wherein the at least one cooling duct is embedded into the at least one plastic compound of the electrically insulating plastic.

3. The electrical machine according to claim 1 , wherein at least one of the coolant distributor chamber and the coolant collector chamber includes a hollow space, which is at least partially provided in the plastic compound.

4. The electrical machine according to claim 1 , wherein the stator teeth support the stator windings, and
wherein the plastic compound comprising the at least one cooling duct and comprising the at least one stator winding is arranged in the intermediate space disposed between two stator teeth.

5. The electrical machine according to claim 4 , wherein the plastic compound protrudes axially from the intermediate space to surround and embed the first or second end section of the at least one stator winding.

6. The electrical machine according to claim 4 , wherein the plastic compound embeds and surrounds individual winding wires of the at least one stator winding arranged in the intermediate space between the two stator teeth.

7. The electrical machine according to claim 1 , wherein at least one of the coolant distributor chamber and the coolant collector chamber includes a ring-shape cross section perpendicular to the axis of rotation of the rotor.

8. The electrical machine according to claim 1 , wherein the plastic compound embeds and surrounds both the first end section and the second end section of the at least one stator winding to at least partially limit the coolant distributor chamber and the coolant collector chamber.

9. The electrical machine according to claim 1 , wherein at least one of the coolant distributor chamber and the coolant collector chamber is arranged radially on an outside and an inside of the first or second end sections of at least one of the stator windings.

10. The electrical machine according to claim 1 , wherein at least one of the coolant distributor chamber and the coolant collector chamber at least one of:
includes an axial extension of at least one of the stator windings, or
are in each case arranged in an axial extension of at least one of the stator windings.

11. The electrical machine according to claim 1 , wherein at least one of the coolant distributor chamber and the coolant collector chamber connect axially to the at least one of the stator windings.

12. The electrical machine according to claim 1 , wherein at least one of the coolant distributor chamber and the coolant collector chamber connect radially on the outside or radially on the inside as well as axially on an end side to the at least one of the stator windings.

13. The electrical machine according to claim 1 , the stator is arranged along the axial direction between a first and a second bearing shield, which are located opposite one another,
wherein at least one of:
a portion of the coolant distributor chamber is arranged in the first bearing shield, and
a portion of the coolant collector chamber is arranged in the second bearing shield.

14. The electrical machine according to claim 1 , further comprising a coolant supply, which fluidically connects the coolant distributor chamber to a coolant inlet, which is provided on an first bearing shield on an outside that is part of the first bearing shield,
wherein the coolant supply is thermally connected to a first shaft bearing, which is provided in the first bearing shield, for rotatably supporting the stator, and
a coolant discharge, which fluidically connects the coolant collector chamber to a coolant outlet, which is provided on the second bearing shield on the outside, on a front side or circumferentially, is part of the second bearing shield,
wherein the coolant discharge is preferably thermally connected to a second bearing shaft provided in the second bearing shield for rotationally supporting the stator.

15. The electrical machine according to claim 1 , wherein the electrically insulating plastic includes at least one of a thermoset and a thermoplastic.

16. The electrical machine according to claim 1 , wherein the at least one cooling duct includes a tube body, which surrounds a tube body internal space,
wherein at least one separating element, which divides the tube body internal space into at least two partial cooling ducts, which are fluidically separated from one another, is molded on the tube body.

17. The electrical machine according to claim 1 , wherein the at least one cooling duct includes a tube body that comprises a flat tube with two broad sides and two narrow sides.

18. The electrical machine according to claim 1 , wherein the plastic compound is an injection molding compound of the electrically insulating plastic.

19. The electrical machine according to claim 1 , wherein the plastic compound is one piece.

20. The electrical machine according to claim 1 , wherein the stator comprises a stator body,
the plastic compound of the electrically insulating plastic is arranged on an outer circumferential side of the stator body and includes an outer coating on this outer circumferential side.

21. The electrical machine according to claim 1 , wherein the coolant distributor chamber communicates fluidically with the coolant collector chamber by a plurality of cool

Assignees

• Mahle Int Gmbh

Inventors

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

Classifications

• H02K3/24 Primary

  with channels or ducts for cooling medium between the conductors · 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

• H02K5/15

  Mounting arrangements for bearing-shields or end plates · CPC title

• H02K9/227

  Heat sinks · CPC title

• B60K2001/006

  the electric motors · CPC title