Magnetic bearing based on radial rejection and application thereof

Abstract

The invention discloses a magnetic bearing based on radial rejection. The magnetic bearing comprises an annular permanent magnet; 2n current coils are evenly arranged around the annular permanent magnet along a radial direction; and the direction of radial magnetic field generated by the annular permanent magnet is opposite to the direction of radial magnetic field generated by the electric coils. The magnetic bearing employs interaction of the annular permanent magnet and the winding coils to produce radial suspension repulsion; and the magnetic bearing device has simple and compact structure, and is stable and reliable. The invention also discloses a flywheel energy storing device applying the magnetic bearing device; the energy storing device employs exclusive principle of magnetic fields with the same polarity to form a dynamically stable system; and closer distance generates stronger repulsion, so as to facilitate high speed operation of the spindle without colliding or scraping with inner wall of the casing.

Description

technical field [0001] The invention belongs to the technical field of magnetic bearings, and in particular relates to a magnetic bearing based on radial repulsion and its application. Background technique [0002] Electromagnetic bearing is a high-tech mechatronic product with no physical contact, which is the most important feature of its application. Since there is no physical contact, there is no friction, so the electromagnetic bearing has the characteristics of no friction and wear, high speed, no need for lubrication, and long life. These advantages are difficult to achieve with ordinary mechanical bearings. Electromagnetic bearings are mainly used in occasions requiring high speed, high power, high precision and high efficiency. [0003] Flywheel energy storage technology uses a high-speed rotating flywheel as a carrier, converts electrical energy into mechanical energy and stores it in the high-speed rotating flywheel, and realizes the storage and release of electr...

AI Technical Summary

Problems solved by technology

In the traditional flywheel energy storage system based on electromagnetic suspension bearings, the suspension of the main shaft is realized through electromagnetic bearings composed of drivers, sensors and control systems. Two sets of radial electromagnetic bearings are used to realize the suspension of four degrees of freedom in the radial direction of the main shaft of the flywheel; since the electromagnetic bearing and the casing are respectively magnetic objects and magnetic materials, there will be mutual attraction between the two, and the The attractive force will become bigger and bigger as the distance between the two gets closer, so the whole open-loop system is a dynamic unbalanced system, which makes it difficult to control the whole system

[0005] In addition, the electromagnetic bearing flywheel energy storage system widely researched and invented at home and abroad is mostly controlled by feedback closed-loop system, PI control or other control methods. In a flywheel energy storage system with high-speed rotation and large moment of inertia, The above-mentioned defects are difficult to solve through the feedback closed-loop system, which will cause great harm to the entire flywheel energy storage system, such as high-speed collision between the casing and the main shaft, etc.

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