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A closed loop cooling system and method for an oil-free electric motor of an aircraft cabin air compressor. A closed-loop fan, which may be coupled to a motor rotor opposite a compressor impeller, circulates the required cooling air in a closed loop through a motor stator and bearings, a motor coole

A closed loop cooling system and method for an oil-free electric motor of an aircraft cabin air compressor. A closed-loop fan, which may be coupled to a motor rotor opposite a compressor impeller, circulates the required cooling air in a closed loop through a motor stator and bearings, a motor cooler, and a ducting used to complete the flow circuit via a ram air cooled heat exchanger. The cooling air may be pressurized to cabin pressure. The system and method of the present invention eliminates the possibility of contaminating trace amounts of oil in cabin supply air.

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We claim: 1. An apparatus for cooling a motor, comprising: a closed-loop fan for supplying forced air to a motor, wherein the motor comprises an air bearing; and a motor cooler; wherein a recycle air exits the motor and enters the motor cooler; wherein the motor cooler provides cooled air to the cl

We claim: 1. An apparatus for cooling a motor, comprising: a closed-loop fan for supplying forced air to a motor, wherein the motor comprises an air bearing; and a motor cooler; wherein a recycle air exits the motor and enters the motor cooler; wherein the motor cooler provides cooled air to the closed-loop fan; and a motor housing, wherein the closed-loop fan is driven by a dedicated motor. 2. The apparatus of claim 1, wherein the motor cooler comprises an air-to-air heat exchanger. 3. The apparatus of claim 1, wherein the motor cooler is cooled by a ram air. 4. A compressor cooling system for a vehicle, comprising: a motor including a motor housing; a compressor driven by the motor such that the compressor compresses a ram air; a closed-loop fan for supplying forced air into the motor housing; and a motor cooler for receiving a recycle air from the motor housing, wherein the motor cooler cools the recycle air to provide cooled air to the closed-loop fan. 5. The compressor cooling system of claim 4, wherein the motor cooler is cooled by a ram air. 6. The compressor cooling system of claim 4, wherein a first portion of a single source of ram air is compressed by the compressor, and a second portion of the single source of ram air flows through the motor cooler. 7. The compressor cooling system of claim 4, wherein the compressor is disposed between the motor and the motor cooler. 8. The compressor cooling system of claim 6, wherein the compressor is in axial alignment with the motor and the motor cooler. 9. The compressor cooling system of claim 4, wherein the closed-loop fan is affixed to the motor housing. 10. The compressor cooling system of claim 4, wherein the motor comprises an air bearing and wherein the motor is oil-free. 11. A compressor cooling system for a vehicle, comprising: a motor including a motor housing; a compressor driven by the motor such that the compressor compresses a ram air; a closed-loop fan for withdrawing forced air from the motor housing; and a motor cooler for receiving a recycle air from the motor housing, wherein the motor cooler cools the recycle air to provide cooled air to the closed-loop fan. 12. The compressor cooling system of claim 11, wherein the motor cooler comprises an air-to-air heat exchanger. 13. The compressor cooling system of claim 11, wherein the closed-loop fan is affixed to the motor housing. 14. The compressor cooling system of claim 11, wherein the closed-loop fan is driven by a dedicated motor. 15. A cabin air compressor cooling system for an aircraft, comprising: a motor; a fan for supplying forced air into the motor; a motor cooler such that a recycle air exits the motor and enters the motor cooler; and a compressor driven by the motor and disposed between the motor and the motor cooler such that the compressor compresses a ram air after the ram air flows across the motor cooler; wherein the motor cooler provides cooled air to the fan. 16. The compressor cooling system of claim 15, wherein the motor is an electric motor. 17. The compressor cooling system of claim 15, wherein the motor cooler comprises an air-to-air heat exchanger. 18. A compressor cooling system for an aircraft, comprising: a motor; a compressor driven by the motor, wherein the compressor compresses a ram air; a backface cavity situated between the motor and the compressor; a closed-loop fan for supplying forced air into the motor; a motor cooler such that a recycle air exits the motor and enters the motor cooler; wherein the motor cooler provides cooled air to the closed-loop fan; and an air conditioning pack for receiving a compressed air from the compressor. 19. The compressor cooling system of claim 18, wherein the motor is an electric motor. 20. The compressor cooling system of claim 18, wherein the motor cooler comprises an air-to-air heat exchanger. 21. The compressor cooling system of claim 18, wherein the backface cavity is open to the external environment. 22. The compressor cooling system of claim 21, wherein a seal leakage air exits through the backface cavity. 23. The compressor cooling system of claim 22, wherein make-up air is diverted from a portion of the compressed air and fed to the recycle air. 24. The compressor cooling system of claim 23, wherein a scavenge flow filter removes waste from the portion of the compressed air to provide clean make-up air. 25. The compressor cooling system of claim 18, wherein the motor cooler is cooled by a ram air. 26. The compressor cooling system of claim 25, wherein a first portion of a single source of ram air is compressed by the compressor, and a second portion of the single source of ram air flows through the motor cooler. 27. A method for cooling a motor, comprising: forcing air into the motor; drawing recycle air from the motor into a motor cooler; cooling the recycle air within the motor cooler to produce a cooled air; feeding the cooled air into the motor; and combining make-up air from a compressed air with the recycle air. 28. The method of claim 27 wherein the forcing step includes using a closed-loop fan for forcing the air into the motor. 29. The method of claim 27 wherein the motor cooler comprises an air-to-air heat exchanger. 30. The method of claim 27, wherein the feeding step includes using a closed-loop fan for feeding the cooled air into the motor. 31. The method of claim 27, further comprising cooling the motor cooler with a ram air. 32. The method of claim 27, wherein the motor comprises an air bearing and wherein the motor is oil-free. 33. A method for cooling a motor, comprising: forcing air into an electric motor by using a closed-loop fan; flowing air across a stator and a rotor of the electric motor for cooling; drawing recycle air from the electric motor into an air-to-air heat exchanger; driving a compressor with the electric motor, wherein the compressor compresses a ram air; cooling the recycle air within the air-to-air heat exchanger to produce a cooled air; cooling the air-to-air heat exchanger with another ram air; and feeding the cooled air into the electric motor; wherein the electric motor comprises an oil-free electric motor and includes an air bearing.