Permanent magnet-biased inner rotor radial magnetic bearing with fault tolerance function

Abstract

The invention provides a permanent magnet-biased inner rotor radial magnetic bearing with a fault tolerance function. The permanent magnet-biased inner rotor radial magnetic bearing comprises a left outer magnetism-conducting ring, a right outer magnetism-conducting ring, a permanent magnet, a left stator core, a right stator core, a magnetizing coil, a left rotor core, a right rotor core and an inner magnetism-conducting ring, wherein the external parts of the left and right stator cores are connected with the left and right outer magnetism-conducting rings respectively; the permanent magnetis positioned between the left and right outer magnetism-conducting rings; the left and right rotor cores are positioned in the left and right stator cores respectively; the left and right rotor cores are connected with the inner magnetism-conducting ring; the stator cores adopt the form of a pole shoe; and an air gap is formed between the outer surfaces of the stator cores and the inner surfacesof rotors. The permanent magnet-biased magnetic field provided to the magnetic bearing by the permanent magnet bears a radial force applied onto the magnetic bearing; and the regulating action of themagnetic field generated by an electromagnetic coil is used for changing the strength of the magnetic fields of the two stator cores in magnetic pole direction and making the rotors have non-contact support.

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 with a fault-tolerant function. 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 the hybrid magnetic suspension bearing with permanent magnet bias has be...

AI Technical Summary

Problems solved by technology

The radial magnetic bearing of this structure generates a static bias magnetic field through the current, which has the disadvantages of high power consumption, large volume and weight, etc.

In a patented permanent magnet bias radial magnetic bearing with redundant structure (patent number: 200710063270.7), although the structure can realize the redundant function, 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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