Comparison Traditional Gear ‑Driven Centrifugal Compressor and Maglev
Centrifugal Compressor |
| Comparison Item |
Traditional Gear ‑Driven Centrifugal Compressor |
Maglev Centrifugal Compressor |
| Bearing & Drive System |
Adopts oil ‑lubricated tilting ‑pad bearings. Equipped with
gearbox for speed ‑increasing transmission. The motor drives
the impeller through high ‑ speed gear sets. |
Equipped with active magnetic levitation bearings.
High ‑speed permanent ‑magnet motor direct ‑drive
structure. The impeller is directly installed on the motor rotor.
No gearbox and no mechanical contact during operation. |
| Lubrication System |
Complete oil circulating system including lube oil, oil pump, oil
cooler, oil filter and oil separator. Regular oil replacement is
needed. Risks of oil leakage and oil carry ‑over exist. |
100% oil ‑free design. No lubricating oil for bearings and
transmission components. Only air filter and cooling circuit are
required. |
| Mechanical Loss |
There are gear meshing loss and bearing friction loss, with total
transmission loss of 3 ‑ 5%. |
No contact friction, almost zero mechanical transmission loss. |
| Full ‑load Efficiency |
High efficiency, yet restricted by losses of gear and oil system. |
Higher efficiency, motor efficiency can reach up to 97%. |
| Part ‑load Performance |
Efficiency drops sharply when the load is below 70 ‑ 80% of
rated flow. Narrow adjustment range and easy to approach
surge line. |
Wide speed ‑adjusting range from 10% to 100% load. Maintain
high efficiency under partial ‑load conditions. Better
anti ‑surge capacity through speed regulation. |
| Compressed Air Quality |
Risk of residual oil vapor. Additional high ‑grade filters are
required to achieve oil ‑free air standard. |
Deliver compressed air meeting ISO 8573 ‑ 1 Class 0 oil ‑free
standard. Zero risk of oil contamination. |
| Noise & Vibration |
85 _90 dB(A). Obvious vibration caused by gear meshing and
bearing friction. |
70 _80 dB(A). Extremely low vibration with active magnetic
damping control. |
| Maintenance Workload |
Heavy _duty maintenance tasks: regular oil change, oil filter
replacement, gear inspection, bearing monitoring and seal
check. |
Low _maintenance design. Main work is air filter replacement.
No gear or oil _related servicing. Only routine check for maglev
controller and cooling components. |
| Installation Foundation |
Heavy anti _vibration concrete foundation is mandatory. |
Extra heavy anti _vibration foundation is not required thanks
to low vibration level, with compact footprint. |
| Initial Purchase Cost |
Relatively low procurement cost. |
Higher upfront investment for magnetic bearing controller and
high _speed permanent _magnet motor. |
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