Magnetic bearing system is composed of the following five components: controller, rotor, solenoids, sensors and power amplifiers. One of the most critical component is the controller. Controller performance largely determine the performance of the magnetic bearing system. Control law controller conical bearing determines the dynamic performance and stiffness of the magnetic bearing system, damping and stability.
The controller is divided into two kinds: Analog controllers and digital controllers. Compared with the digital controller analog controller has the following disadvantages :( a) adjustment inconvenient; (b) it is difficult to implement complex control; (c) can not simultaneously achieve two or more degrees of freedom control; (d) mutual change is poor, that is, different magnetic bearing controller must have a corresponding; large (five) power consumption, large volume and so on.
Magnetic bearing to be widely used, the difference between analog controller to adjust the performance of online say that it is one of the reasons, therefore, the direction is the marine crane bearing development trend of digital magnetic bearing. At the same time, to achieve intelligent magnetic ferris wheel bearing systems, analog controller is obviously difficult to meet this requirement. Therefore, to improve the magnetic bearing from the performance, reliability, and enhance the flexibility and reduce the volume controller, power, and in the future to network, intelligent direction angles, the controller must implement digitization. The last three decades has been the rapid development of control theory and made widely used.
Magnetic bearings, is a new high-performance bearings. Compared with conventional ball bearings, plain bearings and oil film bearings, magnetic bearings there is no mechanical contact, the rotor can reach very high operating speed, with a small mechanical wear, low energy consumption, low noise, long life, no lubrication, no oil pollution etc., especially for high-speed, vacuum, clean and other special environment. It can single-row crossed roller slewing bearing be widely used in machining, turbo machinery, aerospace, vacuum technology, rotor dynamics identification and other tests in the field, is recognized as a very promising new bearings.
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