Electrical machine having dual-circuit cooling
AssigneeSiemens Aktiengesellschaft
InventorsKlaus Büttner, Klaus Kirchner
Life of this patent
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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.
Claims18
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;
- a first temperature gauge configured to measure a temperature in the first coolant flow as the first coolant flow exits an outlet of the rotor cooling system;
- a stator cooling system formed by a second cooling circuit for cooling the stator using a second coolant flow,
- wherein the rotor cooling system and stator cooling system form closed cooling systems, respectively, so as to enable a control of the rotor cooling system independently of the stator cooling system,
- wherein the first cooling circuit and the second cooling circuit have a common section;
- a pump located in the common section of the first and second cooling circuits;
- and
- at least one controller provided in at least one of the first and second cooling circuits.
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, a first temperature gauge configured to measure a temperature in the first coolant flow as the first coolant flow exits an outlet of the rotor cooling system, and a stator cooling system for cooling the stator using a second coolant flow flowing in a second cooling circuit, wherein the rotor cooling system and stator cooling system form closed cooling systems, respectively, so as to enable a control of the rotor cooling system independently of the stator cooling system, wherein the first cooling circuit and the second cooling circuit have a common section, wherein a pump is located in the common section of the first and second cooling circuits, and wherein at least one controller is provided in at least one of the first and second cooling circuits.
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 by a rotor cooling system using a first coolant flow in a first cooling circuit;
- cooling a stator by a stator cooling system using a second coolant flow in a second cooling circuit;
- measuring a temperature in the first coolant flow by a first temperature gauge as the first coolant flow exits an outlet of the rotor cooling system;
- allowing a control of the rotor cooling system independently of the stator cooling system by forming the rotor cooling system and stator cooling system as closed cooling systems, respectively;
- adjusting a flow rate of the first coolant flow for cooling the rotor in dependence of an operating state of the electrical machine,
- providing a pump in a common section of the first cooling circuit and the second cooling circuit;
- and
- arranging at least one controller in at least one of the first and second cooling circuits.
Dependencies are inferred from the claim text.