SKF
Magnetic Bearings and Systems
SKF magnetic bearings and systems use electromagnetic fields to levitate a rotor without mechanical contact, eliminating friction, wear, and the need for lubrication. The system comprises electromagnets, position sensors, and a digital controller that continuously adjusts the magnetic field to keep the shaft centred under dynamic loads. This technology is primarily used in high-speed rotating machinery such as turbo-compressors, gas expanders, high-speed motors, and flywheel energy storage systems. Magnetic bearings offer unparalleled high-speed capability (surpassing 100,000 rpm), active vibration control, built-in condition monitoring, and the ability to operate in process gas or vacuum environments without contamination. SKF’s systems are custom-engineered for each application, integrating the magnetic actuator, control cabinet, and auxiliary backup bearings. For processes demanding zero contamination, extreme speeds, or minimal maintenance, magnetic bearings represent the ultimate in rotating shaft support.
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Trusted by Industry Leaders
Contact-Free Levitation
No mechanical friction, wear, or need for lubricants.
Extreme Speed Capability
Rotor speeds limited only by material strength, not bearing limits.
Active Vibration Control
Controller dampens rotor vibrations, enabling supercritical operation.
Built-In Condition Monitoring
Continuous measurement of rotor position, loads, and system health.
Process Gas Compatible
Rotor can operate in natural gas, refrigerant, or vacuum without seals.
Oil-Free System
Eliminates oil lubrication, filtration, and thermal management infrastructure.
Magnetic Bearings in Natural Gas Compression
Pipeline compressors using magnetic bearings can operate directly in the gas stream without oil contamination, simplifying sealing systems and improving gas quality. The bearings’ active vibration control also allows lightweight, high-speed rotors that reduce compressor footprint and capital cost.
How SKF Magnetic Bearing Systems Manage Rotor Instabilities
Through fast digital signal processing and electromagnetic actuators, the system actively dampens rotor vibrations, enabling safe passage through critical speeds. This allows machines to run above their first or second bending mode, achieving power densities unattainable with conventional bearings.