A Double Permanent Magnet Deflection Lorentz Force Magnetic Bearing

Abstract

The invention discloses a Lorentz force type magnetic bearing capable of realizing double permanent magnet deflection. The bearing comprises a rotor system and a stator system, wherein the rotor system mainly comprises an outer mounting sleeve, outer magnetic steel, an outer magnetism isolating ring, an outer upper magnetism conducting ring, an outer lower magnetism conducting ring, an outer lower magnetism conducting ring lock nut, a turntable, an outer assembly lock nut, an inner mounting sleeve, inner magnetic steel, an inner magnetism isolating ring, an inner upper magnetism conducting ring, an inner lower magnetism conducting ring, an inner lower magnetism conducting ring lock nut and an inner assembly lock nut; the stator system mainly comprises a stator framework, an aluminum substrate, a winding and epoxy resin glue. The magnetic steel axial magnetization scheme is adopted, the number of magnetic steel turns is reduced, the gap flux density fluctuation caused by uneven magnetomotive force of the magnetic steel is reduced, the paramagnetic effect is realized by the aid of the magnetism conducting rings, the gap flux density fluctuation caused by assembly of the outer magnetic steel and the inner magnetic steel is further reduced, and high-precision deflection control torque can be realized. Besides, a magnetism conducting material is used as a magnetic pole material, precision machining of a magnetic pole surface is facilitated, and requirements for size precision and surface roughness of the magnetic steel are reduced.

Description

technical field [0001] The invention relates to a non-contact magnetic suspension bearing, in particular to a double permanent magnet deflection Lorentz force magnetic bearing. Background technique [0002] With the development of aerospace technology, the spacecraft platform has higher and higher requirements for the torque accuracy of the attitude control system, and the momentum wheel supported by traditional mechanical bearings is gradually insufficient. The magnetic levitation flywheel supported by magnetic bearings eliminates the friction and wear of mechanical bearings, does not require lubrication, and can rotate at high speed. Compared with flywheels supported by mechanical bearings, it has the advantages of high precision, micro-vibration and long life, and the torque accuracy can reach 10. -5 Nm level, it is an ideal inertial actuator for spacecraft platforms. The advantage of the magnetic levitation flywheel in terms of speed enables it to work in the reaction s...

AI Technical Summary

Problems solved by technology

The above-mentioned Lorentz force magnetic bearings all have a common feature. The magnetic pole surfaces are all magnetic steel cylinders, which are very difficult to process, with low dimensional accuracy and roughness, and it is not easy to eliminate the edge effect of the magnetic field.

In addition, the whole ring magnetic steel of the Lorentz force magnetic bearing is spliced, and there are large magnetic density and flux fluctuations at the splicing place, which reduces the control accuracy and output torque accuracy of the magnetic bearing.

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