ELECTRICAL MACHINE HAVING DUAL-CIRCUIT COOLING

• US 20130234543A1
• Filed: 03/05/2013
• Published: 09/12/2013
• Est. Priority Date: 03/08/2012
• Status: Active Grant

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Bttner, Klaus, Kirchner, Klaus
• Granted Patent: US 9,287,754 B2
• Time in Patent Office: Days
• US Class Current: 310/54
• CPC Class Codes: B60L 2220/12 Induction machines
• CPC Class Codes: B60L 2240/36 Temperature of vehicle components or parts
• CPC Class Codes: B60L 2240/425 Temperature
• CPC Class Codes: B60L 3/0061 relating to electrical machines
• CPC Class Codes: B60L 50/51 characterised by AC-motors
• CPC Class Codes: H02K 9/197 in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
• CPC Class Codes: Y02E 10/72 Wind turbines with rotation axis in wind direction
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

An electrical machine includes a stator and a rotor which is pivotally mounted about an axis of rotation and interacts magnetically with the stator during operation of the electrical machine. The rotor has a rotor cooling system for cooling the rotor using a first coolant flow, and the stator is cooled by a stator cooling system using a second coolant flow.

Claims

1. An electrical machine, comprising

a stator;

a rotor pivotally mounted about an axis of rotation and interacting magnetically with the stator during operation of the electrical machine, said rotor having a rotor cooling system for cooling the rotor using a first coolant flow; and

a stator cooling system for cooling the stator using a second coolant flow.

2. The electrical machine of claim 1, constructed in the form of an asynchronous machine.

3. The electrical machine of claim 1, wherein the rotor cooling system has an inlet for the first coolant flow to enable a control of the rotor cooling system independently of the stator cooling system.

4. The electrical machine of claim 1, further comprising a shaft for support of the rotor, said rotor cooling system having a guide assembly so that at least part of the rotor cooling system extends along the shaft.

5. The electrical machine of claim 4, wherein at least part of the rotor cooling system is disposed in the shaft.

6. The electrical machine of claim 4, wherein the guide assembly of the rotor cooling system for guiding the first coolant flow has an axial bore formed in the shaft, and an inflow element extending in the axial bore.

7. The electrical machine of claim 6, wherein the rotor cooling system has an inlet for the first coolant flow to enable a control of the rotor cooling system independently of the stator cooling system, said inlet to the rotor cooling system being connected to the inflow element.

8. The electrical machine of claim 6, wherein the shaft has an open end sized to define a space to allow the first coolant flow to exit the axial bore, said space being delimited in an axial direction by an axial boundary configured to enable the first coolant flow to be guided spirally about the axis of rotation into an outlet of the rotor cooling system.

9. The electrical machine of claim 1, further comprising a jacket disposed around the stator and housing the stator cooling system for cooling the stator.

10. A cooling system for an electrical machine having a stator and a rotor which is mounted for rotation about an axis and interacts magnetically with the stator during operation of the electrical machine, said cooling system comprising:

a rotor cooling system formed by a first cooling circuit for cooling the rotor using a first coolant flow; and

a stator cooling system for cooling the stator using a second coolant flow.

11. The cooling system of claim 10, further comprising a controller disposed in the first cooling circuit for controlling the rotor cooling system.

12. The cooling system of claim 10, wherein the stator cooling system is formed by a second cooling circuit.

13. The cooling system of claim 12, wherein the first cooling circuit and the second cooling circuit have a common section.

14. The cooling system of claim 10, wherein the rotor cooling system has an inlet for the first coolant flow to enable a control of the rotor cooling system independently of the stator cooling system.

15. The cooling system of claim 10, wherein the electrical machine has a shaft for support of the rotor, said rotor cooling system having a guide assembly so that at least part of the rotor cooling system extends along the shaft.

16. A vehicle, comprising:

an electrical machine having a stator and a rotor which is mounted for rotation about an axis and interacts magnetically with the stator during operation of the electrical machine; and

a cooling system having a rotor cooling system formed by a first cooling circuit for cooling the rotor using a first coolant flow, and a stator cooling system for cooling the stator using a second coolant flow.

17. The vehicle of claim 16, constructed in the form of a motor vehicle.

18. The vehicle of claim 16, wherein the rotor cooling system has an inlet for the first coolant flow to enable a control of the rotor cooling system independently of the stator cooling system.

19. The vehicle of claim 16, wherein the cooling system has a controller disposed in the first cooling circuit for controlling the rotor cooling system.

20. The vehicle of claim 16, wherein the stator cooling system is formed by a second cooling circuit.

21. The vehicle of claim 20, wherein the first cooling circuit and the second cooling circuit have a common section.

22. The vehicle of claim 16, wherein the electrical machine has a shaft for support of the rotor, said rotor cooling system having a guide assembly so that at least part of the rotor cooling system extends along the shaft.

23. A method for cooling an electrical machine having a stator and a rotor pivotally mounted about an axis of rotation and interacting magnetically with the stator during operation of the electrical machine, said method comprising:

cooling the rotor using a first coolant flow; and

adjusting a flow rate of the first coolant flow for cooling the rotor in dependence of an operating state of the electrical machine.

24. The method of claim 23, further comprising cooling the stator using a second coolant flow, and adjusting a flow rate of the second coolant flow for cooling the stator in dependence of the operating state of the electrical machine.