High-speed fan supported by air bearing and magnetic bearing in mixed mode

Abstract

The invention discloses a high-speed fan supported by an air bearing and a magnetic bearing in a mixed mode. The high-speed fan comprises a volute, a main shell, and a high-speed motor stator, a high-speed motor rotor, a radial air suspension bearing, an axial magnetic bearing, a displacement sensor and an axial magnetic bearing controller which are arranged in the main shell; the volute is connected to the main shell; the high-speed motor rotor is rotationally arranged in the main shell, and one end of the high-speed motor rotor extends into the volute; the impeller is connected to the high-speed motor rotor and located in the volute, and the high-speed motor stator is connected into the main shell; the radial air suspension bearing is used for radially supporting the high-speed motor rotor; the axial magnetic bearing is used for axially positioning the high-speed motor rotor and preventing the high-speed motor rotor from axially moving; and the displacement sensor is used for detecting a movement signal of the high-speed motor rotor in the axial direction and transmitting the signal to the axial magnetic bearing controller to control the axial magnetic bearing to reset the high-speed motor rotor. The high-speed fan is compact in structure, high in reliability and easy to control.

Description

technical field [0001] The invention relates to the technical field of high-speed extension machines, in particular to a high-speed fan supported by air bearings and magnetic bearings. Background technique [0002] The high-speed fan has the advantages of high speed, high power density, energy saving and high efficiency, small size, light weight, and less manufacturing materials, and has attracted more and more attention and favor. Centrifugal blowers, compressors, organic Rankine cycle power generation, hydrogen fuel cells, aerospace and other fields are widely used. Due to the high speed of the motor and the linear speed of the rotor surface of the motor as high as 200m / s, it is difficult for the traditional mechanical bearings to ensure the stable operation of the fan at high speed. The friction and vibration of mechanical bearings will cause severe heating and noise of the bearings. In severe cases, it will cause problems such as bearing grinding, precision reduction, a...

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Problems solved by technology

The radial bearing of the motor of the high-speed fan of the present invention is an air suspension bearing, and the change of working conditions does not generate radial impact force, which fully utilizes the advantages of the air suspension bearing such as small volume, simple structure, and low cost; the axial bearing is a magnetic suspension bearing, When changing, the advantages of large bearing capacity of the magnetic suspension bearing and high controllability of the rotor position are fully utilized, and the problems of low bearing capacity and poor adaptability of the air suspension bearing are overcome, and the safety and reliability of the fan operation are greatly improved; Compared with the five-degree-of-freedom maglev fan, the high-speed fan only needs to control one degree of freedom in the axial direction of the rotor, the control variable is single, the control system is simple, and the reliability is high

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