Structure for achieving five-freedom-degree suspension of rotor through axial mixed magnetic bearings

Abstract

The invention discloses a structure for achieving five-freedom-degree suspension of a rotor through axial mixed magnetic bearings. The structure comprises the magnetic suspension rotor, the axial electromagnetic and permanent-magnetic mixed magnetic bearings are arranged at the two ends of the magnetic suspension rotor in the axial direction respectively and used for providing axial suspension force and radial suspension force for the rotor, and the axial electromagnetic and permanent-magnetic mixed magnetic bearings arranged at the two ends of the rotor in the axial direction are distributed symmetrically; axial displacement sensors are arranged at the two ends of the rotor in the axial direction or the radial direction respectively and connected with a controller, and the controller is connected with the axial electromagnetic and permanent-magnetic mixed magnetic bearings arranged at the two ends of the magnetic suspension rotor in the axial direction through power amplifiers. The structure has the advantages that the active control freedom degree of a magnetic suspension system is lowered to the minimum, controllers, power amplifiers, electromagnetic coils and other components needed by surplus active freedom degree control are omitted, a five-freedom-degree magnetic suspension bearing supporting structure is simplified, and the mixed magnetic bearings lower bias current and system power consumption.

Description

technical field [0001] The invention relates to a magnetic levitation structure, in particular to a five-degree-of-freedom levitation structure of a rotor realized by an axial electromagnetic permanent magnetic hybrid magnetic bearing. Background technique [0002] Magnetic suspension bearing, also referred to as magnetic bearing for short, is an electromechanical device that uses the magnetic force interaction between the stator and the rotor to support the rotor to suspend in space. Since there is no mechanical contact between the rotor and the stator, the rotor of the magnetic suspension bearing can reach a very high speed, and has the advantages of no mechanical wear, low power consumption, low noise, long life, no lubrication, etc., especially suitable for high speed, vacuum, Special applications such as ultra-clean and nuclear power. [0003] In order to realize the non-contact support of the magnetic suspension bearing system to the rotor, it needs to control its fiv...

AI Technical Summary

Problems solved by technology

[0005] (1) Electromagnetic bearing (or hybrid magnetic bearing) structure is used in both radial and axial directions. In this structure, five degrees of freedom need to be equipped with corresponding displacement sensors, power amplifiers, controllers and other hardware. In addition to increasing space and weight, It will also increase the power consumption of the system. The use of permanent magnetic bearings will take up space and increase weight

[0006] (2) Radial permanent magnetic bearing and axial magnetic bearing (or hybrid magnetic bearing) structure, because this structure uses radial permanent magnetic bearing, so the radial displacement sensor and control hardware are omitted, but radial displacement sensor and control hardware are still required. To support the bearing to achieve radial suspension

The characteristic of the above structure is that although the active degree of freedom is reduced, the radial structure is still relatively complicated. In addition, the active magnetic bearings of each degree of freedom control their respective degrees of freedom, and it is impossible to realize the suspension of a single degree of freedom magnetic bearing to multiple degrees of freedom. to regulate

[0008] To sum up, none of the above magnetic levitation structures minimizes the degree of freedom of active control (1), and uses electromagnetic permanent magnetic hybrid magnetic bearings, so that the space volume and system power consumption are not optimal.

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