Bearings with magnetic compressor attraction
15 Jan 2000
York International claims to have moved the process gas compression industry into a new era with the introduction of magnetic bearing technology to its range of Turbomaster centrifugal compressors.
By combining its Series 3M2 centrifugal compressor with the proven magnetic bearing technology of OS2M2 and dry gas seals, York says that oil-free compression, exceptional reliability and low maintenance are now all available from a standard design machine.
The use of magnetic bearing technology not only eliminates wear and frictional power losses, but also reduces seismic vibration transmitted through the compressor casing by as much as 90 per cent. This is because the bearing controllers allow the shaft to rotate about its inertial - as opposed to its geometric - centre.
The conventional external lube system is also eliminated, thereby saving power associated with oil and cooling water pumps.
The electromagnetic bearing system consists of two distinct components: the stationary bearing assemblies, including the radial, axial and auxiliary bearings, and an energy efficient control system. The two combine and provide 5-axis rotor support to levitate and precisely position the rotor such that mechanical contact between the rotor and stator is eliminated, thereby preventing wear and frictional losses.
To guard against any possible shaft deviation due to power interruption, the 3ML2 is fitted with a UPS (uninterrupted power supply) system which ensures that the rotor remains levitated during coastdown.
