Axial self-balancing three-degree-of-freedom magnetic bearing

By independently designing the radial and axial control flux, using four axial magnets and control windings, the magnetic leakage and power consumption problems of the three-degree of freedom magnetic bearings are solved, and a stable suspension effect with greater levitation force and lower power consumption is achieved.

CN120367946AInactive Publication Date: 2025-07-25HUAIYIN INSTITUTE OF TECHNOLOGY
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Patent Information

Application Number
CN202510567179.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-30
Publication Date
2025-07-25
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The radial flux and axial flux of existing three-degree-of-freedom magnetic bearings share air gaps, resulting in large magnetic leakage and power consumption, and insufficient levitation force.

Method used

Four axial magnets are divided into two groups, providing permanent magnetic flux and controlling flux independently. The radial control winding generates radial control flux, and the axial control winding generates axial control flux, forming an independent magnetic circuit to ensure uniformity of the air gap and stable suspension of the stator rotor.

Benefits of technology

It realizes greater radial and axial suspension forces under low power consumption, simplifies the control and assembly process, reduces the difficulty of system control and production costs, and improves the sensitivity and controllable suspension forces of the suspension system.

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Abstract

The axial self-balancing three-degree-of-freedom magnetic bearing is characterized in that a stator part comprises a stator yoke, a left attraction iron core, a right attraction iron core, a left repulsive iron core and a right repulsive iron core which are all mounted on an aluminum alloy bracket, and four poles wound with coils are uniformly distributed on the inner circumference of the stator yoke; an axial control winding is embedded in the attraction iron core, and a stator permanent magnet is embedded in the repulsive iron core. The rotor part comprises a rotor core and a rotating shaft, a radial air gap and an axial air gap are respectively arranged between the rotor core and the radial iron core, between the attraction iron core and the repulsive force iron core, rotor permanent magnets are arranged on two sides of the rotor core and at positions corresponding to the stator permanent magnets of the repulsive force iron core, and the polarities of the stator permanent magnets and the rotor permanent magnets facing the axial air gap are the same. The radial magnetic flux magnetic circuit, the axial control magnetic flux magnetic circuit and the permanent magnetic flux magnetic circuit are completely independent and free of coupling, axial static balance of the rotor is achieved, suspension is achieved in the radial direction, control is easy, and the controllable suspension force is large.
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