A double deflection implicit Lorentz force deflection magnetic bearing

Abstract

The invention discloses a double-deflection hidden lorentz force deflection magnetic bearing. The double-deflection hidden lorentz force deflection magnetic bearing mainly comprises a rotor system and a stator system, wherein the rotor system mainly comprises an outer mounting sleeve, an outer magnetism conductive ring, outer magnetic steel, an outer magnetism isolating ring, an outer magnetism conductive lock nut, a magnetism conductive disc, a rotary disc, an outer assembly lock nut, an inner mounting sleeve, an inner magnetism conductive ring, inner magnetic steel, an inner magnetism isolating ring, an inner magnetism conductive lock nut and an inner assembly lock nut; and the stator system mainly comprises a stator skeleton, an aluminum substrate, a winding and epoxy resin glue. According to the double-deflection hidden lorentz force deflection magnetic bearing, the scheme that multiple circles of magnetic steel is axially arranged inside is adopted, so that strength of an air-gap field and deflection rigidity of the magnetic bearing are improved, magnetic density fluctuation due to splicing gaps of magnetic steel is eliminated, and magnetic density uniformity and control moment precision of the magnetic bearing are improved.

Description

technical field [0001] The invention relates to a non-contact magnetic suspension bearing, in particular to a double deflection implicit Lorentz force deflection magnetic bearing. Background technique [0002] The attitude control system is an important subsystem of the spacecraft, and its attitude control accuracy directly affects the performance of the spacecraft. With the development of space technology, spacecraft have higher and higher requirements for attitude control systems, especially for volume, weight, life, reliability, and functional integration. At present, most spacecraft attitude control systems still use a mechanical flywheel as the actuator of the attitude system. Due to the inherent friction of mechanical flywheels, the need for lubrication, and the inability to perform active vibration control, etc., fundamentally limit the further improvement of flywheel performance. The magnetic levitation flywheel is a new generation of inertial actuators. Due to the...

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Problems solved by technology

The magnetic levitation gyro flywheel described in the paper "A Magnetic Suspension Gyro Flywheel Scheme Design and Key Technology Analysis" uses a three-degree-of-freedom Lorentz force magnetic bearing to achieve axial translation and radial two-degree-of-freedom deflection control, but its axis The direction winding and the deflection winding are placed in the same air gap along the radial direction. When the width of the air gap is constant, the total number of turns of the axial winding and the deflection winding is constant. Therefore, the number of turns of the two windings is small, resulting in axial translation of the magnetic bearing. Low suspension and yaw stiffness

Authorized patent 201110253688.0 A high-torque magnetic levitation flywheel uses a deflection Lorentz force magnetic bearing to control the radial two-degree-of-freedom deflection of the rotor. With a certain air gap width, the number of winding coil turns is increased, and the deflection moment stiffness of the Lorentz force magnetic bearing is improved. , but the magnetic steel is located at the top of the magnetic pole, and the magnetic flux leakage at the edge of the air gap is obvious, which reduces the uniformity of the magnetic density

In addition, the radius of the circle where the magnetic steel is located is relatively large, and the entire ring of magnetic steel needs to be spliced ​​by multiple pieces of magnetic steel. The splicing gap will cause the circumferential fluctuation of the magnetic density, which further reduces the uniformity of the air gap magnetic density.

Chinese patent 201610597382.X is a double permanent magnet deflection Lorentz force magnetic bearing. The magnet is built into the upper and lower magnetic rings, which reduces the edge effect of the magnet and eliminates the flux density fluctuation caused by the splicing gap. However, due to The magnetic steel is far away from the winding and the number of turns is small, resulting in a small air gap magnetic density and low deflection stiffness

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