Background of levitation bearing of electromagnetic levitation blower

The development of AMB technology is driven by the demand of modern industry for a new generation of support technology.

With the development of modern industry, the rotation of machinery has put forward various performance requirements. In energy and chemical machinery, the requirements of rotor speed and accuracy are higher and higher, the gap between rotor and stator is smaller, and the pursuit of efficiency is higher. For other rotating machinery working under extreme high temperature or low temperature in military industry, aerospace and other fields, in addition to being able to withstand harsh environmental tests, the controllability, safety and reliability of the support are often considered first.

Compared with other machines, the z-axis characteristic of rotating machinery is that the movement of the rotor is always limited by the space with relatively small clearance. For traditional oil lubricated bearings, the clearance ratio is between 1 ≤ 1000 and 5 ≤ 1000 Due to the various excitation effects on the rotor during operation, this small gap constraint is easy to be destroyed, which is also the reason why the support has become the key technology restricting the development of high-performance rotating machinery.

The technical performance requirements for the new generation of supports are as follows: (1) high speed: from tens of thousands to hundreds of thousands of revolutions per minute; (2) High precision: the support is required to have good dynamic performance. For example, the dynamic amplitude of the rotor should be controlled within a certain range; (3) Controllability; (4) Adaptability to various harsh environments; (5) Reliability.

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