Patent ID: 9556875
Date: 2017-01-31
CPC Classifications: F04D

Claim:
1. A compressor assembly for compressing a refrigerant in a chiller system comprising: a. a centrifugal compressor having a 250-ton capacity or larger, said centrifugal compressor having a compressor housing with a compressor inlet for receiving the refrigerant and a compressor outlet for delivering the refrigerant; b. a shaft; c. an impeller in fluid communication with said compressor inlet and said compressor outlet, said impeller mounted to said shaft and being operable to compress refrigerant; and d. a direct drive, variable speed, permanent magnet motor for directly driving the shafts; and e. a variable speed drive configured to vary a speed of operation of the direct drive, variable speed, permanent magnet motor, wherein the speed of operation is expressed as N