Characteristic classification of magnetic NSK bearing

Source: China Bearing Network Time: 2014-02-19

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Magnetic bearings are a method of supporting a load or a suspended rotor by magnetic force. These bearings have been developed rapidly over the years; especially in high speed, low friction, high (low) temperature and vacuum environments. Magnetic bearings and others The support method has its common advantages; it has great prospects.
First, characteristics and classification
1. Features 1 conflict.
2 high support accuracy; safe operation; reliable.
3 can work in high temperature, deep cold and vacuum environment.
4 layout is messy; demand conditions are harsh; there is magnetic disturbance to the environment; but no other pollution.
2. Classification magnetic bearings are classified according to their control methods, magnetic energy history, layout methods, etc. In addition, they can be classified into permanent magnet type, electromagnet type and permanent magnet D electromagnet type according to the type of magnetic field. It can also be classified according to the type of bearing suspension force. Suction type and repulsive type. Superconducting magnetic bearings are also divided into low temperature superconducting and high temperature superconducting. There are some special constraints between different types in the above categories; special attention should be paid.
1 permanent magnet type bearing can only be passive type (forced type); passive type bearing can not be stable in 3 directions; at least 1 direction should be active type.
2 DC encouraged bearings can only be active (automatic).
3 pure electromagnet type bearing can only be 5 degree of freedom control type bearing; its volume, quality and power consumption are relatively large.
4 repulsion type magnetic bearings; because the magnetic utilization rate is low; the layout is more attractive than the suction type; usually rarely used.

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