The turbocompressor has become a mainstay of modern water treatment technology, offering a mechanically simple design, reliability and good energy efficiency. Ideally suited for the production of large volumes of compressed air at relatively low pressure, they rely on bearings that can spin at high speeds with minimal resistance and for extended periods. Today, the market is dominated by two rival technologies: air foil bearings and active magnetic bearings.
Edward Paro of Sulzer compares their strengths and weaknesses.
The rotor at the heart of a turbocompressor is powered by a high-speed electric motor, usually with no intermediate gearing. In operation, the motor shaft and rotor assembly spin at speeds of up to 50’000 rpm, and may operate continuously for extended periods between overhauls. Those conditions require a special type of bearing, and two approaches are commonly used in modern turbocompressor designs.











