In an active magnetic bearing system, auxiliary bearings support the rotor when the machine is stationary, accommodate overloads, and support the rotor in the event of system fault.
Waukesha Magnetic Bearings offers a range of auxiliary bearing options, all of which are backed by a full-speed landing test.
- Stator-mounted ball bearings – a compact design typically suited to high-speed machines and supercritical rotors
- Rotor-mounted ball bearings – a hybrid system typically suited to medium-speed machines and flexible rotors
- Bushing type bearings – specialized RDS® auxiliary bearings offering reliable condition monitoring and lower sensitivity to contaminants
RDS Auxiliary Bearings: Unmatched Protection
Waukesha’s patented RDS (Rotor Delevitation System®) auxiliary bearings offer unmatched investment protection. The RDS comprises a dry lubricated bushing mounted in a stator component and a special rotor component designed to reduce and dissipate heat during contact and coast-down.
For small machines, the radial and axial bushings are full 360-degree components; this technology is typically utilized in turboexpanders and air compressors. For larger machines, such as centrifugal gas compressors and turbines, a tilting pad bearing technology is used.
This design provides adjustable bearing stiffness and damping performance for rotor stability and imparted load control. Unlike other auxiliary bearings, the RDS is capable of operating in harsh environments, including those with arduous process fluids or elevated temperatures.
The advanced RDS design also offers observability of the service condition over the installed life of a machine – significantly reducing the risk of unplanned downtime. Robust and reliable, Waukesha’s proprietary RDS auxiliary bearing technology is designed for benign failure to prevent damage to machine components in the unlikely event of system malfunction.
Auxiliary Bearing Functionality
Auxiliary bearings prevent damage to machine components in the unlikely event of system malfunction.
RDS auxiliary bearings automatically check clearances to indicate the service condition – reducing the risk of unplanned downtime.