Electrical machine with liquid cooling

Patent metadata

Field	Value
Publication number	US-11025135-B2
Application number	US-201816031829-A
Country	US
Kind code	B2
Filing date	Jul 10, 2018
Priority date	Jul 10, 2018
Publication date	Jun 1, 2021
Grant date	Jun 1, 2021

Abstract

An electrical machine includes a stator including a plurality of stator windings; and a rotor in magnetic cooperation with the stator. The rotor includes a plurality of cooling passages extending therethrough, each cooling passage including an inlet for receiving oil and an outlet for discharging the oil. The electrical machine includes a rotating oil distribution member coupled to the rotor, the oil distribution member including a radially inward portion and a radially outward portion, the radially outward portion being disposed adjacent to the inlets of the plurality of cooling passages. A stationary oil delivery nozzle is constructed to discharge oil toward the radially inward portion of the oil distribution member. The oil distribution member is constructed to receive the oil discharged by the oil delivery nozzle, and to direct the oil to the inlets of the cooling passages to cool the rotor.

First claim

What is claimed is:

1. An electrical machine, comprising:
a stator including a plurality of stator windings;
a rotor in magnetic cooperation with the stator, the rotor including a plurality of cooling passages extending therethrough, each cooling passage including an inlet for receiving oil and an outlet for discharging the oil;
a rotating oil distribution member coupled to the rotor that is constructed to rotate with the rotor, the rotating oil distribution member including a radially inward portion and a radially outward portion, the radially outward portion being disposed adjacent to the inlets of the plurality of cooling passages; and
a stationary oil delivery nozzle constructed to discharge oil toward the radially inward portion of the rotating oil distribution member, wherein the rotating oil distribution member is constructed to receive the oil discharged by the oil delivery nozzle, and to direct the oil to the inlets of the cooling passages to cool the rotor.

2. The electrical machine of claim 1 , wherein the rotating oil distribution member is conical.

3. The electrical machine of claim 1 , wherein the stator windings include a winding overhang disposed at least partially directly radially outward of the outlets of the plurality of cooling passages; and wherein the outlets are constructed to discharge the oil and sling the oil outward and into contact with the winding overhang to cool the winding overhang with the oil.

4. The electrical machine of claim 1 , wherein the oil delivery nozzle is spaced apart axially from the rotating oil distribution member.

5. An electrical machine, comprising:
a stator including a plurality of stator windings;
a rotor in magnetic cooperation with the stator, the rotor including a plurality of cooling passages extending therethrough, each cooling passage including an inlet for receiving oil and an outlet for discharging the oil;
a rotating oil distribution member coupled to the rotor, the rotating oil distribution member including a radially inward portion and a radially outward portion, the radially outward portion being disposed adjacent to the inlets of the plurality of cooling passages;
a stationary oil delivery nozzle constructed to discharge oil toward the radially inward portion of the rotating oil distribution member, wherein the rotating oil distribution member is constructed to receive the oil discharged by the oil delivery nozzle, and to direct the oil to the inlets of the cooling passages to cool the rotor,
wherein the rotating oil distribution member includes an inner surface and an outer surface; and
wherein the oil delivery nozzle is constructed to direct the oil to the inner surface.

6. The electrical machine of claim 5 , wherein the oil delivery nozzle is constructed to direct the oil to a rotating surface; and wherein the rotating surface is constructed to sling the oil radially outward and into contact with the inner surface of the rotating oil distribution member.

7. The electrical machine of claim 5 , wherein the rotating oil distribution member is constructed to increase a pressure of the oil received from the oil delivery nozzle.

8. The electrical machine of claim 7 , wherein the rotating oil distribution member is constructed to drive the oil into the inlets of the cooling passages, along and through the cooling passages and to discharge the oil from outlets of the cooling passages.

9. The electrical machine of claim 5 , wherein the oil delivery nozzle is constructed to direct the oil to the outer surface of the rotating oil distribution member.

10. The electrical machine of claim 9 , wherein the stator windings include a winding overhang; and wherein the rotating oil distribution member is disposed at least partially directly radially inward of the winding overhang and constructed to sling the oil outward and into contact with the winding overhang to cool the winding overhang with the oil.

11. An electrical machine, comprising:
a stator having a plurality of stator windings, the stator windings including a first winding overhang;
a rotor in magnetic cooperation with the stator;
an oil distribution member coupled to the rotor, the oil distribution member being disposed at least partially directly radially inward of the first winding overhang; and
at least one oil delivery nozzle constructed to discharge oil toward the oil distribution member, wherein the oil distribution member is constructed to sling the oil outward and into contact with the first winding overhang to cool the first winding overhang with the oil,
wherein the oil distribution member is constructed to provide oil cooling to the rotor and to the stator windings simultaneously.

12. The electrical machine of claim 11 , wherein the rotor includes a plurality of cooling passages extending therethrough, each cooling passage having an inlet for receiving the oil; wherein the oil distribution member is constructed to direct oil to the inlets of the cooling passages and through the cooling passages to cool the rotor.

13. The electrical machine of claim 12 , wherein the stator windings have a second winding overhang; wherein each cooling passage includes an outlet for discharging the oil, and wherein the outlets are constructed to sling the oil into contact with the second winding overhang to cool the second winding overhang with the oil.

14. The electrical machine of claim 12 , wherein at least one oil delivery nozzle is constructed to direct the oil to a rotating surface; and wherein the rotating surface is constructed to sling the oil radially outward and into contact with the oil distribution member.

15. The electrical machine of claim 14 , wherein the oil distribution member is constructed to increase a pressure of the oil received from the oil delivery nozzle and supply pressurized oil to the inlets of the cooling passages.

16. The electrical machine of claim 11 , wherein the oil distribution member is conical.

17. The electrical machine of claim 11 , wherein the at least one oil delivery nozzle is spaced apart axially from the oil distribution member.

18. The electrical machine of claim 11 , wherein the oil distribution member includes an inner surface and an outer surface; and wherein the at least one oil delivery nozzle is constructed to direct the oil to both the inner surface and the outer surface.

19. The electrical machine of claim 18 , wherein the at least one oil delivery nozzle is constructed to vary the amount of oil directed to the inner surface and to vary the amount of oil directed to the outer surface.

20. The electrical machine of claim 11 , wherein the at least one oil delivery nozzle is constructed to vary the amount of oil provided to the rotor and to vary the amount of oil provided to the stator windings.

Assignees

• Abb Schweiz Ag

Inventors

• Shrestha Ghanshyam
• Tschida Colin E

Classifications

• H02K9/19 Primary

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

• H02K5/203

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

• H02K1/2766

  having a flux concentration effect · CPC title

• H02K1/32

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

• H02K3/24

  with channels or ducts for cooling medium between the conductors · CPC title