Permanent-magnetic bias inner rotor radial magnetic bearing

Abstract

The invention provides a permanent-magnetic bias inner rotor radial magnetic bearing, which comprises magnetizers, stator cores, rotor cores, an outer magnetic conducting ring, an inner magnetic isolation ring, permanent magnets, magnetic exciting coils, a first air gap and a second air gap. The stator cores I and III form eight magnetic poles in X and Y positive-negative directions, each magnetic pole is provided with a magnetic exciting coil, and the magnetizers are outside the stator cores; the rotor cores I and IV are arranged inside the stator cores I and III; the rotor core II, the rotor core III and the inner magnetic isolation ring are arranged inside the stator core II; the rotor cores I and II are connected through an inner magnetic conducting ring; the rotor cores III and IV are connected through an inner magnetic conducting ring II; the inner magnetic conducting ring I and the rotor core II are connected with the outer magnetic conducting ring II and the rotor core III through the inner magnetic isolation ring; the right magnetizer is connected with the middle magnetizer through the permanent magnet I, and the left magnetizer is connected with the middle magnetizer through the permanent magnet II; the magnetic poles of the stator cores are in a pole shoe form; the first air gap is formed between the stator cores and the rotor cores; and the second air gap is formed between the outer magnetizers and the permanent magnets.

Description

technical field [0001] The invention relates to a non-contact hybrid magnetic suspension bearing, in particular to a permanent magnetic bias inner rotor radial magnetic bearing, which can replace the current magnetic bearings used in pairs and greatly shortens the axial distance. Background technique [0002] At present, magnetic suspension bearings are divided into pure electromagnetic bearings and hybrid magnetic suspension bearings with permanent magnetic bias and electromagnetic control. The former uses large current and power consumption, and hybrid magnetic suspension bearings with permanent magnetic bias and electromagnetic control. The electromagnetic field provides auxiliary adjustment. Bearing capacity, the magnetic field generated by the permanent magnet bears the main bearing capacity, which has the advantages of reducing the loss of the power amplifier, reducing the ampere-turns of the electromagnet, and reducing the volume and weight of the magnetic bearing, so ...

AI Technical Summary

Problems solved by technology

In some structures, the permanent magnets are directly connected to the stator laminated iron core, so that the magnetic circuit of the permanent magnets will lose too much magnetomotive force when passing through the stator iron core vertically, thus greatly weakening the attraction force of the permanent magnets to the rotor shaft. In some structures The permanent magnet is connected to the laminated iron core through the magnetic ring, and the electromagnetic loop is formed through the laminated iron core. Chinese patent application numbers: 200510011271.8 and 200510011530.7 structure of the permanent magnet deflection inner rotor radial magnetic bearing, such as figure 1 and figure 2 As shown, the magnetomotive force of the permanent magnet will not be lost in the laminated iron core, and the electromagnetic magnetic circuit will not pass through the permanent magnet itself. The purpose of small size and light weight required by spacecraft such as space stations

A patented permanent magnetic bias inner rotor radial magnetic bearing (Chinese patent application number: 200510011530.7) although the structure can achieve the purpose of small axial volume, but because of the fluctuation of the magnetic density in the circumferential direction of the air gap magnetic field , so it will cause a large eddy current loss when the rotor rotates at high speed, and it is difficult to meet the requirements of aerospace for power consumption

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