ASHRAE Celebrating 125 Years: Variable Speed Oil-Free Magnetic Bearing Centrifugal Compressors

For nearly 100 years, centrifugal compressors did not change much untilthe advent of the oil-free centrifugal magnetic bearing. Along with someconcurrent technological advance, the oil free centrifugal compressor hasbecome a mainstream HVAC industry technology solution for mid-size air- andwater-cooled chillers.