Magnetic Bearing

The magnetic bearing is made up of two concentric ring shaped permanent magnets (rotor and stator). According to magnetism, we can make the rotor suspend over the stator with no direct contact with each other. Without mechanical friction between rotor and stator the advantage of the bearing is apparent. So magnetic bearing are widely used in industries, for instance, the aerospace technology and ultra high speed rotation machine. 

The rotating part of inductive (mechanical) energy meter needs a bearing. Traditionally, this bearing is made of jewel. Initially, the mechanical friction of new jewel bearing is very small; as a result, the start electrical current is also very small. But the fatal shortage of jewel bearing is it can¡¯t resist abrasion. After 2-3 years of working, the friction retardation of the bearing can make the energy meter lose the accuracy of measurement of electricity. In order to overcome the weakness of jewel bearing, someone thought of using magnetic bearing to replace it. The practice has proved the magnetic bearing can extend the life of energy meter to 20-30 years without influencing its accuracy of measurement. 

The TeBearing Company has devoted itself to the development of magnetic bearing since 1990s. We have accumulated rich experience in this field. The reliability and stability of our products have earned us many customers in Southeast Asia, Middle East and South America. 

The magnetic bearing can be divided into two categories as per the different arrangement of magnets in the bearing. The first is Magnetic Thrust Bearing (MTB), the second Magnetic Suspension Bearing (MSB). MTB is installed under the rotating part of energy meter. The stator of MTB pushes the rotor which is connected with the shaft of rotating disk in the air. However, MSB is installed over the rotating part of energy meter. The stator of MSB attracts the rotor which is connected with the shaft of rotating disk in the air. Axially there is no mechanical friction between the stator and rotor for either MSB or MTB. The starting performance of MSB is better than MTB. But there is much more magnetic material needed for MSB than for MTB. Therefore, practically the MSB is less adopted in order to reduce cost. Therefore, the widely used type is MTB.

According to whether the stator and rotor are paired and encapsulated before delivery, we can further divide magnetic bearing into three types: encapsulated type, open type (no paring and encapsulation before delivery) and detachable type. Whether the bearing is pared and encapsulated or not is not the decisive factor of its performance. The encapsulated bearing may have a little difficulty when installation. The detachable bearing has the advantage of the other two types. It is determined by the customers to adopt which type.

Magnetic Bearing List

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