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A motor driven assembly includes a motor having a motor inlet and a motor outlet, a shaft, and a rotor spaced radially outwards from the shaft. A cooling flow passage is located between the shaft and the rotor. The cooling flow passage fluidly connects the motor inlet and the motor outlet. A compres

A motor driven assembly includes a motor having a motor inlet and a motor outlet, a shaft, and a rotor spaced radially outwards from the shaft. A cooling flow passage is located between the shaft and the rotor. The cooling flow passage fluidly connects the motor inlet and the motor outlet. A compressor is in fluid communication with the motor outlet. The compressor includes a compressor outlet that is in fluid communication with the motor inlet.

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1. A method of cooling a motor driven assembly, comprising the steps of: (1) circulating a first fluid through a first cooling flow passage between a motor shaft and a motor rotor of a motor, wherein a sleeve is disposed at least partially within said first cooling flow passage, said sleeve having a

1. A method of cooling a motor driven assembly, comprising the steps of: (1) circulating a first fluid through a first cooling flow passage between a motor shaft and a motor rotor of a motor, wherein a sleeve is disposed at least partially within said first cooling flow passage, said sleeve having a base portion and plurality of spaced apart fin portions extending from said base portion, the plurality of spaced apart fin portions are each spaced from said shaft, said first cooling flow passage comprising a first sub-passage between said plurality of spaced apart fin portion and a second sub-passage between said plurality of spaced apart fin portions and said shaft;(2) circulating a second fluid through a second cooling flow passage in the motor;(3) circulating at least one of the first fluid or the second fluid from the motor into a compressor; and(4) circulating the at least one of the first fluid or the second fluid from the compressor into a heat exchanger. 2. The method as recited in claim 1, wherein said step (2) further comprises circulating the second fluid through a space between a motor stator and a motor housing. 3. The method as recited in claim 1, further comprising a step (5) (a) circulating the first fluid from the motor into a compressor; and(b) venting the second fluid from the second cooling flow passage to a surrounding environment. 4. The method as recited in claim 1, further comprising a step (5) circulating the at least one of the first fluid or the second fluid from the heat exchanger into the first cooling passage. 5. The method as recited in claim 1, wherein said fin portion includes a fin base and a fin end, and the fin end has one of a squared, rounded, or tapered profile. 6. The method as recited in claim 1, wherein said motor rotor is made of a first material and said fin portion is made of a second material that is different than said first material. 7. The method as recited in claim 1, wherein said shaft includes a first section and a second section, said first section is received in a motor housing and coupled to said motor rotor, and said second section is coupled to at least one fluid compressor. 8. The method as recited in claim 1, wherein there is a spacing between an end of said fin portion and said shaft. 9. A method of cooling a motor drive assembly, comprising the steps of: (1) circulating a first fluid through a first cooling flow passage between a motor shaft and a motor rotor of a motor, wherein a sleeve is disposed at least partially within said first cooling flow passage, said sleeve having a base portion and a fin portion extending from said base portion and said fin portion includes a first fin and a second fin circumferentially offset from said first fin forming a channel and a third fin circumferentially and axially offset from said first fin and said second fin and circumferentially aligned with said channel(2) circulating a second fluid through a second cooling flow passage in the motor;(3) circulating at least one of the first fluid or the second fluid from the motor into a compressor; and(4) circulating the at least one of the first fluid or the second fluid from the compressor into a heat exchanger. 10. The method as recited in claim 1, wherein said first cooling flow passage is a single pass passage. 11. The method as recited in claim 1, a plurality of fins disposed at least partially within said first cooling flow passage, the plurality of fins including a first fin and a second fin that is circumferentially offset from a first fin, wherein the plurality of fins extend inward from a base to a free end. 12. The method as recited in claim 11, wherein said fin includes a fin base and a fin end, and the fin end has one of a squared, rounded, or tapered profile. 13. The method as recited in claim 11, wherein said fin portion extends radially inward from an inner surface of said motor rotor toward said shaft. 14. A method of cooling a motor driven assembly, comprising the steps of: (1) circulating a first fluid through a first cooling flow passage between a motor shaft and a motor rotor of a motor, a plurality of fins disposed at least partially within said first cooling flow passage, the plurality of fins including a first fin and a second fin that is circumferentially offset from a first fin, wherein the plurality of fins extend inward from a base to a free end, wherein said first fin is circumferentially offset from said second fin forming a channel and a third fin is circumferentially and axially offset from said first fin and said second fin and axially aligned with said channel;(2) circulating a second fluid through a second cooling flow passage in the motor;(3) circulating at least one of the first fluid or the second fluid from the monitor into a compressor; and(4) circulating the at least one of the first fluid or the second fluid from the compressor into a heat exchanger. 15. The method as recited in claim 11, further comprising a sleeve that is disposed at least partially within said first cooling flow passage, said sleeve including said plurality of fins. 16. The method as recited in claim 1, wherein said first cooling flow passage is configured to allow a cooling fluid to flow from a first end of said rotor to a second end of said rotor. 17. The method as recited in claim 1, wherein said first cooling flow passage is configured to accept cooling air.