Magnetic Bearings and Systems
Active magnetic bearings hold the rotor in the air on a controlled magnetic field. Position sensors feed a controller, the controller drives the electromagnets, and the shaft touches nothing — no oil, no wear, and vibration you can read and adjust from the control cabinet. SES holds the range as an authorised SKF distributor, covering bearing type Active radial and axial electromagnetic; contact None in normal running; system parts Actuators, position sensors, controller, amplifiers, cabinet; backup Rolling or plain touchdown bearings, rated in landings. Executions include radial magnetic bearings, axial (thrust) magnetic bearings, complete levitated rotor systems, control cabinets and amplifier modules, among others. It is specified most often into turboexpanders in air separation and gas processing and high-speed turbo compressors and blowers. Every part is genuine SKF through official channels, with designation, specification and options confirmed against your duty before it ships — supplied from Kolkata and our branch network, with breakdown cover that does not sit in an inbox.
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From integrated steel plants to power utilities and EPC majors — the works that cannot afford a counterfeit part specify through SES.
Contact
None — the rotor is levitated
Lubrication
No oil or grease in the process
Control
Sensors, controller and amplifiers, supplied as a system
Backup
Touchdown bearings for power loss and overload
Where it runs.
You will find Magnetic Bearings and Systems in the parts of a plant where this particular duty actually occurs. In practice that means turboexpanders in air separation and gas processing, high-speed turbo compressors and blowers, vacuum and process pumps on clean duties, and equally selected steam and gas turbine generator sets, high-speed motor and generator rotors, test rigs where rotor position must be commanded. What links them is the duty rather than the machine name — contact: None — the rotor is levitated. If your installation is not on that list it matters less than you would think: the operating condition decides the specification. Send us the load, the speed, the running temperature and the environment it runs in, and we will match it to the right execution in the SKF range and confirm what is in stock.
Specify it against the duty.
Specification here follows the operating condition, not the catalogue. The process gas must never see oil — A magnetic bearing system, and delete the oil system entirely. No seal arrangement is as clean as having no lubricant present in the first place. The machine runs faster than a rolling bearing can survive — A system sized from the rotor dynamics. The critical speed map drives this design, not a bearing load rating. The site loses power without warning — Touchdown bearing life quoted in landings, plus a defined coast-down. Every uncontrolled landing consumes part of that life and none of it comes back. Where two of those apply at once, specify for the harsher of the two — under-specifying is what puts the part back on the bench a month later. Send us the duty and we will confirm the execution.
Ordering this from SES.
Count and log every touchdown. Touchdown bearings are consumables with a life measured in landings, and the first sign that they are used up is usually a rotor that will not lift cleanly. Send the designation off the failed part and we will confirm the SKF equivalent and stock position.