Three-degree-of-freedom hybrid magnetic bearing

Abstract

The invention relates to the field of magnetic suspension bearing manufacturing, and discloses a three-degree-of-freedom hybrid magnetic bearing. The three-degree-of-freedom hybrid magnetic bearing comprises a radial stator, an axial stator, a biased permanent magnet, a radial control winding and an axial control winding. The radial stator is used for providing a magnetic circuit for permanent magnet bias magnetic flux and radial control magnetic flux, has 12 teeth and is formed by laminating silicon steel sheets, and the specific material of the silicon steel sheets is not limited. The axial stator is used for providing a magnetic circuit for permanent magnet bias magnetic flux and axial control magnetic flux and is made of a magnetic conductive material. The biased permanent magnet is made of samarium cobalt magnetic steel and used for providing bias magnetic flux in the radial direction and the axial direction. The radial control winding is wound by copper wires, and 12 groups of radial control winding are separately wound on each radial stator tooth. The radial suspension of a rotor is controlled by changing the size of the control current in the radial control winding. The axial control winding is used for controlling axial suspension, and the axial suspension is controlled by changing the magnitude of current in the winding. According to the three-degree-of-freedom hybrid magnetic bearing, the radial stator adopts 12 teeth, coupling between two radial degrees of freedom is reduced, the position of an axial control coil is adjusted, the axial length of the rotor is reduced, the modal frequency of the rotor is improved, and the three-degree-of-freedom hybrid magnetic bearing is more suitable for high-power and high-speed motors.

Description

technical field [0001] The invention belongs to the field of magnetic suspension bearings, and specifically relates to a three-degree-of-freedom hybrid magnetic bearing design, which can simultaneously control the three degrees of freedom of translation in the radial X and Y directions and translation in the axial Z direction, and is suitable for aerospace, nuclear energy, The support of wind power generation, sewage treatment, flywheel energy storage, high-speed motors and other types of rotating machinery in other industrial fields belongs to the field of high-power and ultra-high-speed electric transmission. Background technique [0002] Magnetic bearings use electromagnetic force to suspend the rotor in the air, so that there is no contact between the rotor and the stator. It has the advantages of no friction, no wear, no need for lubricating oil, high speed support, dynamic adjustment of rotor displacement, high control precision, and long life. series a bit. Tradition...

AI Technical Summary

Problems solved by technology

Traditional radial-axial hybrid magnetic bearings often use two axial control windings placed on the inner side of the stator disk in the axial stator. Due to the limitation of axial space, it is impossible to wind a large number of turns, so it cannot meet the requirements of the large axis. The demand for radial force; the stator tooth pole usually adopts four tooth poles, which will cause a strong coupling between the two radial degrees of freedom, which will have a certain impact on the accuracy and stability of the radial control

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