Oil-free pressurized air is needed in several industrial fields, i.e. paper mills and in electronics manufacturing. The pressure level is rather high, 600 - 900 kPa, and the compressor type usually used in these applications are dry screw compressors and gearbox-driven centrifugal compressors. However, drawbacks of these kinds of compressors are wearing of the components, high maintenance costs and increased energy consumptions during the life-time. To tackle these drawbacks, the prototype of a two-stage centrifugal compressor was designed, manufactured and tested. Both compressor impellers and the electric motor are on the same shaft, and magnetic bearings are used to make the machine oil-free. Due to the high-pressure level and two compressor stages, the centrifugal compressor needs to run at relatively high rotation speed.
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