Magnetic bearing electromagnetic force sensing device based on optical fiber grating and on-line measurement system

Abstract

The invention relates to an optical fiber grating magnetic force bearing electromagnetic force sensing device and an online measuring system, belonging to the optical fiber grating magnetic force sensing technical field, wherein the device comprises an L-shaped magnetic elastic unit 1 and an optical fiber grating 2 enclosed in the elastic unit groove, a magnetic force bearing stator 4, a magnetic force bearing rotor 5. The convex part of the L-shaped magnetic elastic unit is spliced in the groove at the bottom of the magnetic force bearing stator 4, and the other part is suspended in the air gap to form the cantilever structure. When in measurement, the wideband light source transmits the light with certain bandwidth and the conversion part into the optical fiber grating magnetic force sensing device through the light transmission, wherein the optical fiber grating 2 in the device generates the wavelength excursion due to the strain, according to the wavelength selection of the optical fiber grating, the required light is reflected, then is transmitted to the wavelength demodulation module through the light transmission and the conversion, which measures the change of the reflecting wavelength of the optical fiber grating, and the wavelength data are transmitted to the computer through the signal collection circuit. The wavelength is converted to the strain and reckons the electromagnetic force through the corresponding program, which realizes the record and the display of the electromagnetic force. The invention is suitable for the dotty distributing measurement of the electromagnetic force.

Description

technical field [0001] The invention belongs to the technical field of optical fiber grating electromagnetic force sensing, and is especially used for multi-point distributed measurement and online detection of electromagnetic force. technical background [0002] Magnetic bearing is a high-performance electromechanical integration product, mainly composed of bearing stator, rotor, displacement sensor, control system, power amplifier and other parts. Magnetic bearings use controllable electromagnetic force to suspend the rotor in space without any mechanical contact between the rotor and the stator. Compared with traditional bearings (rolling or sliding bearings), it has the advantages of no contact, no wear, long life, high speed, no need for lubrication and sealing, low power consumption, high precision, controllable and adjustable support characteristics, etc., and can be widely used It is used in military and industrial fields such as satellite attitude control, maglev f...

AI Technical Summary

Problems solved by technology

Since the rotor must be in contact with the probe of the tension / compression force sensor, the tension / compression force sensor can only measure the static electromagnetic force offline, and cannot obtain the electromagnetic force distribution of the magnetic levitation rotor in the rotating state; the magnetic bearing stator / The working air gap of the rotor is only about 0.3mm, and it is difficult for ordinary piezoelectric tension / compression force sensors to realize multi-point layout for multi-point distributed measurement of electromagnetic force. Solve the key problems of online measurement of electromagnetic force of magnetic bearing

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