Lorentz-force axial magnetic bearing of outer rotor

Abstract

The invention discloses a lorentz-force axial magnetic bearing of an outer rotor. The lorentz-force axial magnetic bearing mainly comprises two parts, namely a stator system and a rotor system, wherein the stator system mainly comprises a skeleton, an upper winding, a lower winding, epoxy resin glue, magnetic-conductive seats and a stator locking nut; the rotor system mainly comprises upper magnetic steel, lower magnetic steel, a magnetic-isolated ring, a magnetic-conductive ring, a rotor locking nut and a sleeve. The lorentz-force axial magnetic bearing disclosed by the invention has the beneficial effects that the windings are directly provided with the magnetic-conductive seats with good heat-conductive performances, so that the copper loss and the rotary loss of the windings can be quickly conducted out by the magnetic-conductive seats; since a single-edge magnetic steel structure is adopted, the lorentz-force axial magnetic bearing has the advantages of simple structure, good linearity, high bandwidth, good heat conducting performance and the like, the structure reliability of the axial magnetic bearing is improved, and simultaneously the temperature rise of the magnetic bearing is reduced, so that the lorentz-force axial magnetic bearing can be used for non-contact suspension supporting such as a magnetic suspension momentum wheel and a magnetic-suspension gyroscope.

Description

technical field [0001] The invention relates to a non-contact outer rotor Lorentz force axial magnetic bearing, in particular to an outer rotor Lorentz force axial magnetic bearing. Background technique [0002] Magnetic suspension bearings are divided into reluctance magnetic bearings and Lorentz force magnetic bearings. The former changes the magnetic density and flux at the pole surface by changing the size of the air gap or magnetomotive force, thereby controlling the magnitude and direction of the electromagnetic force. The air gap of the latter is constant, and the magnitude and direction of the ampere force in the coil are controlled by changing the magnitude and direction of the winding current. For the reluctance magnetic bearing, the magnetic density is proportional to the control current, and the electromagnetic force is proportional to the square of the magnetic density. The electromagnetic force of the reluctance magnetic bearing is proportional to the control c...

AI Technical Summary

Problems solved by technology

Due to the large air gap of the Lorentz force magnetic bearing, generally 4 ~ 6mm, the magnetic density generated by the permanent magnet in the air gap is generally 0.2 ~ 0.4T, and the suspension ampere force is proportional to the magnetic density, that is, a large current is required In order to output a certain suspension force, so the power consumption is relatively large, and the heat generated is correspondingly large

Especially when the Lorentz force magnetic bearing is used to bear the load or output the deflection torque, the coil current is larger and the heat generated is more. Excessive heat will cause the temperature of the Lorentz force magnetic bearing to rise sharply, which will easily lead to the curing of the coil. Accidents such as melting, coil insulation varnish melting and short circuit

Due to the above defects, the existing Lorentz force magnetic bearings have the disadvantages of high power consumption and difficulty in heat dissipation in the application of magnetic suspension momentum wheels and magnetic suspension gyroscopes

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