A two-degree-of-freedom halbach array deflection Lorentz force magnetic bearing

Abstract

The invention discloses a Halbach array deflecting lorentz force magnetic bearing with two degrees of freedom, which comprises a rotor system and a stator system, wherein the rotor system mainly comprises an outer flux sleeve, an outer flux-insulating ring, an outer upper Halbach array magnetic steel, an outer lower Halbach array magnetic steel, an outer upper paramagnetic sleeve, an outer lower paramagnetic sleeve, an outer upper magnetic steel nut, an outer lower magnetic steel nut, a turntable, an outer component nut, an inner flux sleeve, an inner flux-insulating ring, an inner upper Halbach array magnetic steel, an inner lower Halbach array magnetic steel, an inner upper paramagnetic sleeve, an inner lower paramagnetic sleeve, an inner upper magnetic steel nut, an inner lower magnetic steel nut and an inner component nut; the stator system mainly comprises a stator framework, an aluminum substrate, a winding and an epoxy resin glue. According to the Halbach array deflecting lorentz force magnetic bearing, the Halbach array magnetic steel structure is adopted, so that the air-gap field strength is enhanced, the bearing capacity and rigidity of the magnetic bearing are increased, the output of large-top control torque is benefited, the paramagnetic sleeve is utilized to eliminate the flux density fluctuation caused by the splicing gap of the magnetic steel, the flux density uniformity in air gap is promoted and the precision of output torque is increased.

Description

technical field [0001] The invention relates to a non-contact magnetic suspension bearing, in particular to a two-degree-of-freedom Halbach array deflection Lorentz force magnetic bearing. Background technique [0002] Generally, magnetic bearings can be divided into reluctance magnetic bearings and Lorentz force magnetic bearings. The former changes the magnitude and direction of the electromagnetic force by changing the size of the air gap or magnetomotive force, and the latter changes the magnitude and direction of the electromagnetic force by changing the current placed in a constant magnetic field. The size and direction of the rotor achieve stable suspension. The reluctance magnetic bearing has the advantage of large bearing capacity, but the magnetic flux of the reluctance magnetic bearing has a linear relationship with the current, and the electromagnetic force has a square relationship with the magnetic flux. Therefore, the electromagnetic force of the reluctance ty...

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Problems solved by technology

[0005] The above-mentioned Lorentz force magnetic bearings have a common feature. They all adopt a single-turn magnetic steel structure, and the magnetic field strength in the air gap is low, resulting in a small bearing capacity and output torque of the magnetic bearing.

In addition, the magnetic steel rings in the above scheme are made of multiple pieces spliced ​​together, and there are splicing gaps in each piece of magnetic steel, resulting in large fluctuations in the magnetic density in the air gap, which reduces the control accuracy of the magnetic bearing.

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