What is magnetic bearing

Magnetic bearings from EAAT

The EAAT team has been setting new standards in the development and construction of magnetic bearings for more than 25 years. We use our experience to develop and manufacture magnetic bearings in a wide variety of designs and for a wide variety of industries - always precisely tailored to the needs of our customers.

EAAT engineers will be happy to develop a magnetic bearing for you that is precisely tailored to your application.

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Advantages of magnetic bearings from EAAT

A magnetic bearing works without contact and is therefore wear-free. Lubricants do not have to be used, and maintenance requirements are low. Due to their hermetic encapsulation, they are ideal for vacuum applications or use in clean rooms.

Magnetic bearings enable direct process monitoring and the setting of position parameters via the control electronics during operation. Vibrations and imbalances can be actively dampened with magnetic bearings from EAAT.

A magnetic bearing - what is it?

A magnetic bearing enables storage without material contact by using magnetic forces. In principle, active and passive magnetic bearings can be distinguished from one another.

Active magnetic bearings

Active magnetic bearings generate their bearing force through regulated electromagnets that are arranged around the shaft. The position of the shaft is recorded using position sensors. The differences between the setpoint and actual values โ€‹โ€‹of the position are evaluated by digital control electronics and compensated for with the aid of the power electronics. For this purpose, the electromagnets in the active magnetic bearing are controlled in such a way that the shaft remains in the desired position or assumes this position. A continuous change of the setpoint is possible - e.g. B. when the shaft is to be moved on a revolving path.

Active magnetic bearings are dependent on a constant power supply and are therefore usually equipped with a mechanical safety bearing that provides protection in the event of a power failure.

Passive magnetic bearings

The functionality of passive magnetic bearings is based on the forces of permanent magnets. Depending on the force acting on the shaft, there is a deflection from the central position, which remains as long as this force is active. For this reason, passive bearings are used when a force-related position deviation can be permitted.

Often, passive magnetic bearings are combined with conventional bearings or an active magnetic bearing. Contactless storage in the radial and axial direction only with passive bearings is not possible. However, passive magnetic bearings are cheaper and do not depend on a functioning power supply.

Areas of application

Thanks to their advantages, magnetic bearings are a powerful alternative to conventional bearing principles. They are used, for example, in compressors, vacuum applications, tool spindles and textile machines.

Products already implemented

Speed โ€‹โ€‹[rpm]Radial bearing force 967Thrust bearing force 967Shaft mass [kg]Data Sheets
High speed motor140.000402001,2German
Rotating bending test stand-8.000-2 x 85 (shared)
Turbine demonstrator5.60025.00050.0002.500
Retention bearing test bench6.80016.00020.0001.600
Flywheel energy storage45.00030 (passive)3008
Tubular centrifuge75.0001452009,3