Specifications

The Compressor Technology
Model WMC’s exceptional efciency and reliability is due to
its cutting-edge magnetic bearing compressor technology.
A digitally-controlled magnetic bearing system replaces
conventional oil lubricated bearings and a direct drive motor
eliminates the need for a lubricated gear box. The compressor
shaft, shown in Figure 1, levitates on a magnetic cushion and
is the compressor’s only major moving component. Sensors
at each magnetic bearing provide real-time feedback to
the bearing control system. As a result of this sophisticated
design, model WMC has many advantages over chillers with
traditional centrifugal compressors.
Figure 1: Magnetic Bearing Compressor
5
1
3
3
4
2
1
1. Magnetic Bearings and Bearing Sensors
2. Permanent Magnet Synchronous Motor
3. Backup Bearings
4. Shaft and Impellers
5. Compressor Cooling
Oil-Free Compressor Design Benets
No Oil Management System = Greater Reliability
With magnetic bearings operating in a magnetic eld
instead of oil-lubricated bearings, the oil handling
equipment is removed. No need for:
oil pumps
oil reservoirs
oil coolers
oil lters
water regulating valves
oil relief valves
oil storage and disposal
oil system controls, starter, piping, heaters, etc.
that are needed to maintain oil quality. These devices can
be a fault source in traditional chillers, and removing them
signicantly increases unit and system reliability.
No Oil System = Reduced Maintenance Costs
With oil removed from the system, oil samples, oil changes,
oil system maintenance, oil lter changes, and leaks are
eliminated.
Totally Oil-Free Operation = Greater Efciency
The use of oil-free magnetic bearing technology
signicantly increases chiller efciency by reducing
frictional losses within the bearing system.
In addition, efciency improvements can be realized since
there is no oil to coat the heat transfer surfaces.
No Oil Loss = Sustainable Performance
With no possibility of oil loss at light loads or due to
worn seals, the original energy saving efciency can be
maintained for the life of the chiller.
No Oil System = Low Vibration & Sound Levels
With the use of magnetic bearings, the compressor
vibration levels are extremely low, minimizing vibration that
could be transmitted to the structure.
With low vibration levels, sound levels are lower compared
to traditional centrifugal chillers.
feaTures and benefITs
CAT 602-4 • MAGNITUDE
®
MODEL WMC CHILLERS 4 www.DaikinApplied.com
feaTures and benefITs