Three-degree-of-freedom hybrid bias magnetic bearing

Abstract

The invention discloses a three-degree-of-freedom hybrid bias magnetic bearing. Eight annular magnetizing yoke permanent magnets and four radial magnetizing tooth permanent magnets jointly generate permanent magnet bias magnetic flux, one bias winding generates electromagnetic bias magnetic flux, hybrid excitation of the permanent magnet bias magnetic flux and the electromagnetic bias magnetic flux is achieved in the radial direction and the axial direction, then the hybrid excitation acts with two radial suspension control magnetic flux and one axial suspension control magnetic flux, three suspension forces are generated, the bearing capacity in each direction is obviously enhanced, and the bearing has unique advantages in high-power application occasions. According to the three-degree-of-freedom hybrid bias magnetic bearing, the three-degree-of-freedom levitation capability is provided, the structure is compact, the integration level is high, the bias magnetic flux adjusting range is wide, the inherent rigidity is high and critical rotating speed and power density are high, the electromagnetic bias magnetic flux is convenient to adjust, the magnetic bearing load working condition adaptability is high, the design difficulty of the suspension power converter under the variable load working condition is low, suspension control is simple, and suspension precision is high.

Description

technical field [0001] The invention relates to a three-degree-of-freedom hybrid bias magnetic bearing, which belongs to the technical field of magnetic suspension bearings. Background technique [0002] Magnetic suspension bearing has excellent characteristics such as no friction, no wear, no need for seal lubrication, high speed, high precision, long life and low maintenance cost, which effectively solves the bearing support problem of high-speed motors. The active magnetic bearing achieves the suspension of the rotating shaft by controlling the electromagnetic force between the stator and the rotor, and is widely used in the field of high-speed motors. According to the method of establishing the bias magnetic field, active magnetic bearings are divided into electromagnetic type and hybrid type. The bias flux of hybrid magnetic bearings is generated by permanent magnets. It has large load capacity, adjustable stiffness, flexible control, and high power density. It is wide...

AI Technical Summary

Problems solved by technology

However, because traditional hybrid magnetic bearings only use permanent magnets as the bias magnetic field, the bias flux cannot be adjusted, the inherent stiffness is not high, and the critical speed and power density need to be further improved; in addition, the permanent magnet flux cannot be adjusted. Finally, the maximum suspension bearing capacity of the magnetic bearing is fixed, so the suspension capacity of the hybrid magnetic bearing is limited by the magnetic energy of the permanent magnet, and the overload capacity is weak

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