Trapezoid spherical surface deflection lorentz force magnetic bearing

Abstract

The invention discloses a trapezoid spherical surface deflection lorentz force magnetic bearing composed of a rotor system and a stator system. The rotor system mainly comprises an outer flux sleeve, an outer magnetism isolation ring, outer upper trapezoid spherical surface magnetic steel, outer lower trapezoid spherical surface magnetic steel, an outer upper paramagnetic sleeve, an outer lower paramagnetic sleeve, an outer upper trapezoid spherical surface magnetic steel lock nut, an outer lower trapezoid spherical surface magnetic steel lock nut, a rotary disc, an outer assembly lock nut, an inner flux sleeve, an inner magnetism isolation ring, inner upper trapezoid spherical surface magnetic steel, inner lower trapezoid spherical surface magnetic steel, an inner upper paramagnetic sleeve, an inner lower paramagnetic sleeve, an inner upper trapezoid spherical surface magnetic steel lock nut, an inner lower trapezoid spherical surface magnetic steel lock nut and an inner assembly nut. The stator assembly mainly comprises a stator framework, an aluminum base plate, a winding and an epoxy resin adhesive. The trapezoid spherical surface structure is adopted in the magnetic steel, the fringe effect of the magnetic field is weakened, the magnetic flux density uniformity is improved, the strength of the magnetic field is improved, and large-angle deflection is facilitated; and in addition, the magnetic flux density fluctuation of the magnetic steel due to splicing gaps is eliminated through the paramagnetic sleeves, and high-precision torque control is facilitated.

Description

technical field [0001] The invention relates to a non-contact magnetic suspension bearing, in particular to a trapezoidal spherical deflection Lorentz force magnetic bearing. Background technique [0002] Magnetic bearings are divided into magnetic resistance magnetic bearings and Lorentz force magnetic bearings. The former changes the magnitude and direction of the electromagnetic force by changing the magnitude and direction of the magnetomotive force to achieve stable suspension of the rotor. The latter is placed in a constant magnetic field by changing The size and direction of the current in the energized coil realize the stable suspension of the rotor. The electromagnetic force of the magnetic resistance magnetic bearing has a square relationship with the magnetic flux, and the magnetic flux has a linear relationship with the current, so the electromagnetic force has a square relationship with the current, so the magnetic resistance magnetic bearing has the characteris...

AI Technical Summary

Problems solved by technology

[0006] The Lorentz force magnetic bearings in the above schemes all adopt a rectangular magnetic steel structure. There is a strong magnetic circuit edge effect at the right angle of the magnetic steel, resulting in more magnetic flux leakage and poor uniformity of the magnetic density in the deflection air gap.

At the same time, the magnetic steel adopts the whole ring splicing method, and there is a certain gap in the splicing of the magnetic steel, which further reduces the uniformity of the deflection air gap magnetic density.

In addition, the deflection air gap is in the shape of a cylindrical shell, which limits the rotor deflection angle, resulting in a narrow range of rotor deflection, about ±1.5°

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