Superimposed effect implicit lorentz force magnetic bearing

Abstract

The invention discloses a superimposed effect implicit lorentz force deflection magnetic bearing composed of a rotor system and a stator system. The rotor system mainly comprises an outer installing sleeve, an outer magnetism conduction ring, an outer magnetism isolation ring, outer radial magnetizing magnetic steel, outer axial magnetizing magnetic steel, an outer paramagnetic ring, an outer magnetic steel lock nut, a rotary disc, an outer assembly lock nut, an inner installing sleeve, an inner magnetism conduction ring, an inner magnetism isolation ring, inner radial magnetizing magnetic steel, inner axial magnetizing magnetic steel, an inner paramagnetic ring, an inner protection sleeve, an inner magnetic steel lock nut and an inner assembly lock nut. The stator assembly mainly comprises a stator framework, an aluminum substrate, a left winding, a right winding, a front winding, a rear winding and epoxy resin adhesive. The magnetic steel is located in the magnetism conduction rings,and air gap flux density axial fluctuation of an explicit lorentz force magnetic bearing due to magnetic steel gap splicing is eliminated. In addition, magnetic flow generated by the radial magnetizing magnetic steel and magnetic flow generated by the axial magnetizing magnetic steel are overlapped at the air gap position, and the strength of the air gap flux density is improved on the premise that the axial size of the magnetic bearing is not increased.

Description

technical field [0001] The invention relates to a non-contact magnetic suspension bearing, in particular to an implicit Lorentz force magnetic bearing with superposition effect. Background technique [0002] According to the principle of electromagnetic force generation, active magnetic bearings can be divided into reluctance magnetic bearings and Lorentz force magnetic bearings. The former changes the magnetomotive force of the magnetic circuit by controlling the current of the magnetic pole winding coil, adjusts the size of the air gap magnetic flux, and generates the required suspension support force. The force and the current have a square relationship. After linearization, the linear range is narrow , the control precision is low. The latter generates the required suspension support force by controlling the magnitude and direction of the current placed in the constant magnetic field winding, and its force is proportional to the current, with good linearity and high con...

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Problems solved by technology

[0003] A high-torque magnetic levitation flywheel described in Chinese patent 201110253688.0 uses an explicit Lorentz force deflection magnetic bearing external to the magnetic steel to control the radial two-degree-of-freedom deflection of the rotor. The air gap magnetic density is high, but the permanent magnets in the winding edge area Flux leakage is obvious

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 ​​with multiple pieces of magnetic steel. The gap at the splicing place will cause flux density fluctuations, which further reduces the uniformity of the air gap flux density.

Chinese patent 201610597382.X proposed a double permanent magnet implicit Lorentz force deflection magnetic bearing. The magnetic steel is placed between the upper and lower paramagnetic rings, which eliminates the flux density fluctuation caused by the splicing of the magnetic steel. The steel is far away from the winding, and the air gap magnetic field strength is low

A double-deflection implicit Lorentz force deflection magnetic bearing described in Chinese patent 201710220580.9 adopts a multi-turn magnetic steel and a double-winding structure, and has a high air-gap magnetic density and good uniformity, but it improves the air-gap magnetic field While increasing the strength and the output torque of the magnetic bearing, it also increases the axial dimension of the magnetic bearing

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