Four-degree-of-freedom inner rotor magnetic bearing

Abstract

The invention discloses a four-degree-of-freedom inner rotor magnetic bearing. The four-degree-of-freedom inner rotor magnetic bearing consists of driven part inner rotor magnetic conducting rings, inner rotor permanent magnets, inner rotor magnetic conducting bodies, inner rotor iron cores, air gaps, stator iron cores, stator magnetic conducting rings, stator permanent magnets, coils, driven part stator magnetic conducting rings and driven part air gaps, wherein each of the stator iron cores consists of four magnetic poles, which form magnetic poles in the positive and negative directions of X and Y axes; certain gaps are left between the outer surfaces of the inner rotor iron cores and the inner surfaces of the stator iron cores to form the air gaps; the two driven part stator magnetic conducting rings are positioned between the two stator iron cores; two stator permanent magnets are arranged between the stator iron cores and the driven part stator magnetic conducting rings; one stator permanent magnet is arranged between two driven part stator magnetic conducting rings; the inner rotor permanent magnets are arranged between the two inner rotor magnetic conducting bodies; and the driven part air gaps are formed between the inner surfaces of the driven part inner rotor magnetic conducting rings and the outer surfaces of the driven part stator magnetic conducting rings. The four-degree-of-freedom inner rotor magnetic bearing has the characteristics of small volume and easy disassembly.

Description

technical field [0001] The invention relates to a non-contact magnetic suspension bearing, in particular to a four-degree-of-freedom inner rotor magnetic bearing, which can be used as a non-contact support for rotating components such as a single-frame control moment gyroscope and a double-frame control moment gyroscope for space. Background technique [0002] Magnetic suspension bearings are divided into pure electromagnetic type and hybrid magnetic suspension bearing with permanent magnetic bias and electromagnetic control. The former uses large current and high power consumption, and the hybrid magnetic suspension bearing with permanent magnetic bias and electromagnetic control uses permanent magnets instead of pure electromagnetic magnetic bearings. The bias current in the bearing generates a bias magnetic field, the magnetic field generated by the permanent magnet bears the main bearing capacity, and the electromagnetic field provides an auxiliary adjustment bearing capa...

AI Technical Summary

Problems solved by technology

In order to increase the output torque, the existing magnetic levitation control torque gyroscope usually adopts a five-degree-of-freedom fully active magnetic bearing configuration. However, the magnetic levitation control torque gyroscope with this structure uses current to control the output torque, so it consumes a lot of power and is bulky. , the circuit is complex, and the two-degree-of-freedom magnetic levitation control torque gyroscope with passive magnetic bearing output torque can be made very small, but because the passive magnetic bearing is uncontrollable, it has the defects of low damping and poor stability. In addition, the existing four There is an interaction between the stiffness of the active part of the degree of freedom magnetic bearing and the stiffness of the passive part, which will increase the control difficulty of the control system

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