A method and device for measuring the rotational speed of an aero-engine

Abstract

The invention discloses a method for measuring the rotating speed of an aeroengine. A magnetic component is arranged on the rotating shaft of the aeroengine to generate a magnetic field whose magnetic field direction is perpendicular to the axial direction of the aeroengine rotating shaft and whose magnetic field distribution changes periodically with the rotation of the aeroengine rotating shaft. ; At least a pair of Hall sensors whose measurement planes are perpendicular to the direction of the magnetic field and arranged oppositely symmetrically to each other are arranged on the periphery of the aeroengine, and a pair of differential rotational speeds with the same amplitude but opposite phases are collected by the Hall sensors signal, and the rotational speed of the aeroengine is obtained by processing the differential rotational speed signal. The invention also discloses an aeroengine rotational speed measuring device. Compared with the prior art, the present invention can avoid various signal interference problems to the greatest extent, and is easy to realize the self-diagnosis function of the rotational speed sensor.

Description

technical field [0001] The invention relates to a method for measuring the rotational speed of an aeroengine. Background technique [0002] In the control of aeroengines, the engine speed is a very important controlled quantity. The control of the engine state is reflected in the control of the speed, and the speed is also an important parameter to evaluate the performance of the engine. Therefore, the accuracy and stability of rotational speed measurement directly affect the control state of the engine. [0003] The speed sensors generally used in aero-engines include Hall sensors, magnetoelectric speed sensors, photoelectric speed sensors and speed measuring motor sensors. At present, most aeroengines use Hall sensors for speed measurement, but because the speed signals generated will be interfered by external noise, differential Hall sensors are often used. The existing differential Hall sensor still uses a single-channel Hall sensor to collect the magnetic field signal...

AI Technical Summary

Problems solved by technology

At present, most aero-engines use Hall sensors for speed measurement, but because the speed signals generated will be interfered by external noise, differential Hall sensors are often used

The existing differential Hall sensor still uses a single-channel Hall sensor to collect the magnetic field signal. The differential signal is output after the difference of the collected single-channel speed signal by the internal differential output module. The traditional differential Hall sensors can avoid signal interference in signal transmission to a certain extent, but still do not solve the problem of noise interference in complex environments from the perspective of signal sources; in addition, traditional differential Hall sensors are limited by their signal generation methods. Difficult to achieve in terms of sensor self-diagnosis

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