With the integration of the motor, VSD, and magnetic-bearing system, the capacitors required for the motor and drive can be used as a backup power source for 8hpgasaircompressor the bearings in the event of a power outage or emergency shutdown.CAPACITY AND EFFICIENCYAmong the key parameters affecting performance are capacity (tons) and efficiency (kilowatts per ton). The compressor''s capacity ranges from 60 to 90 tons, depending on the operating conditions. Plans call for that range to be extended to 150 tons water-cooled and 115 tons air-cooled by the end of 2004 with the use of R-134a refrigerant. An R-22 version is planned for retrofit applications.Efficiency improvements stem from a combination of the centrifugal compressor, permanent-magnet 8hpgasaircompressor motor, and magnetic 8hpgasaircompressor bearings. Within the compressor, efficiency is affected by the 8hpgasaircompressor compressor isentropic efficiency (the efficiency of the wheels), the motor, and the bearings. Traditional induction motors of this size typically are in the 92-percent efficiency range. This compressor''s permanent-magnet motor has an efficiency of 96 to 97 percent.

The compressor uses capacitors to smooth 8hpgasaircompressor and 8hpgasaircompressor ripples in the PC link in the motor drive. Instantaneously after a power failure, the motor becomes a "generator," using its angular momentum to create electricity (sometimes known as back EMF) and keeping the capacitors charged during the brief coastdown period. The capacitors, in turn, provide enough power to maintain levitation during coastdown, allowing the motor rotor to stop and delevitate. This feature allows the compressor 8hpgasaircompressor to see a power outage as a normal shutdown.OIL-FREE DESIGNOil management, 8hpgasaircompressor particularly as it pertains to the lubrication of compressor bearings, is a critical issue in refrigeration-system design. But with 8hpgasaircompressor magnetic bearings, this issue is avoided. Only a very small amount of oil is required to lubricate other system components, such as seals and valves; often, however, experience shows that even this small amount of oil is not needed. Avoiding oil-management systems means avoiding the capital cost of oil pumps, sumps, heaters, coolers, and oil separators, as well as the labor and time required to perform oil-related services. Reports indicate that for many installations, compressor-maintenance costs have been cut by more than 50 percent.

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