Cooling system for an electrical machine
View Patent ↗A cooling system for an electrical machine includes a substantially closed housing, a first heat exchanger arranged inside of the housing, a second heat exchanger arranged outside of the housing, a conduit assembly for transferring a heat exchange medium in a closed circuit between the first and the second heat exchangers, a first air circulating means configured to circulate air inside of the housing over the first heat exchanger, and a second air circulating means configured to circulate air outside of the housing over the second heat exchanger, wherein the conduit assembly includes a pump for actively circulating the heat exchange medium between the first and the second heat exchangers.
1. A cooling system for an electrical machine, the cooling system comprising:
a substantially closed housing,
a first heat exchanger arranged inside of the housing,
a second heat exchanger arranged outside of the housing,
a conduit assembly for transferring a heat exchange medium in a closed circuit between the first and the second heat exchangers,
a first air circulating means configured to circulate air inside of the housing over the first heat exchanger, and
a second air circulating means configured to circulate air outside of the housing over the second heat exchanger,
characterized in that the conduit assembly comprises a pump for actively circulating the heat exchange medium between the first and the second heat exchangers.
2. The cooling system according to claim 1 , wherein the housing mechanically supports the second heat exchanger in relation to the ground.
3. The cooling system according to claim 2 , wherein the second heat exchanger is mounted on top of the housing.
4. The cooling system according to claim 1 , wherein at least one of the first and the second air circulating means comprises a fan.
5. The cooling system according to claim 1 , wherein the heat exchange medium remains in a liquid state during the operation.
6. An electrical machine comprising a stator, a rotor, a shaft and a cooling system, the cooling system comprising:
a substantially closed housing,
a first heat exchanger arranged inside of the housing,
a second heat exchanger arranged outside of the housing,
a conduit assembly for transferring a heat exchange medium in a closed circuit between the first and the second heat exchangers,
a first air circulating means configured to circulate air inside of the housing over the first heat exchanger, and
a second air circulating means configured to circulate air outside of the housing over the second heat exchanger,
characterized in that the conduit assembly comprises a pump for actively circulating the heat exchange medium between the first and the second heat exchangers.
7. The electrical machine according to claim 6 , wherein the first air circulating means is configured to circulate air over the heat sources of the machine.
8. The electrical machine according to claim 7 , wherein the heat sources comprise the stator and the rotor.
9. The electrical machine according to claim 6 , wherein the first air circulating means comprises a fan fixedly assembled to the shaft.
10. The electrical machine according to claim 6 , wherein the second air circulating means comprises a fan fixedly assembled to the shaft.
11. A method for cooling an electrical machine comprising a stator and a rotor, the method comprising the steps of:
providing the electrical machine with a substantially closed housing;
providing a first heat exchanger inside of the housing;
providing a second heat exchanger outside of the housing;
providing a conduit assembly for transferring a heat exchange medium in a closed circuit between the first and the second heat exchangers;
circulating air inside of the housing over the first heat exchanger; and
circulating air outside of the housing over the second heat exchanger;
characterized by actively circulating the heat exchange medium between the first and the second heat exchangers.
12. The method according to claim 11 , wherein the method comprises the step of circulating air over the stator and the rotor.