No friction, no limits: Magnetic bearings do not only increase lifetime but also enable vacuum operation with highest rotational speeds. With our technology you can reach 500,000 rpm and more.
Every engineer knows the equation that high rotational speeds come along with high abrasion and reduced lifetime of the ball bearings.
As a high speed specialist Celeroton is particularly faced with this challenge. This is why we offer a technologically leading alternative for unlimited lifetime despite highest rotation speeds - our ultra-high-speed magnetic bearings. We have integrated the technology in the new motor CM-AMB-400.
Most magnetic bearing concepts are based on reluctance forces. A magnetic flux in the air gap between stator and rotor generates these forces whereas the flux is regulated by stator currents.
Functional principle of an active magnetic bearing
In this magnetic bearing type, the rotational speed is limited due to increasing eddy current losses in the rotor and stator iron, a limited actuator bandwidth and a high reactive power demand. Therefore, magnetic bearings have only been successful up to rotational speeds of about 120,000 rpm.
To overcome these rotational speed limits, Celeroton has researched a new magnetic bearing concept. The new bearing enables rotational speeds of 500,000 rpm and more, which represents the world record for a magnetically levitated drive system.
The bearing is based on Lorentz forces instead of reluctance forces. A winding, which lies in the air gap between the rotor magnets and the stator iron, generates these forces – electric current in the winding regulates them. The magnetic field of the permanent magnet can also be used for the generation of the torque, which enables a short design of the motor as so called bearingless motor.
Generation of forces and torque of a Celeroton magnetic bearing motor
Example of a magnetically levitated motor with 400,000 rpm for the operation of a rotating mirror in a high speed camera.
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Are you facing such a challenge in your company? We are excited to master it together with you. Do not hesitate to contact us.