Tacheometry apparatus for microminiature turbojet

Abstract

The invention discloses a device for measuring the rotating speed of a microminiature turbine jet engine, comprising a permanent magnet, a reluctance type sensor and a rotating speed signal processing circuit. With the rotation of the turbine jet engine, the magnet of a rotator of the engine generates an alternating magnetic field so as to lead the reluctance type sensor arranged on the engine togenerate a weak electric signal which is matched with the reluctance type sensor, and the weak electric signal is transformed to a digital signal after being filtered, reshaped and amplified by the rotating speed signal processing circuit. The device for measuring the rotating speed has long measurement distance, small volume and high reliability, thus being applicable to the precise measurement of the super high rotating speed of the microminiature turbine jet engine under severe environment.

Description

Technical field [0001] The invention relates to a rotational speed measuring device of a miniature turbojet engine, belonging to the field of signal measurement. Background technique [0002] For aero engines, the sensor signal is an extremely important monitoring parameter, which not only reflects the working status of the system but also determines other performance parameters. It plays an extremely important role in the control of the entire engine. The accuracy and reliability of speed measurement directly affects the control accuracy and safety performance of the system. Commonly used sensors for speed measurement include Hall sensors, photoelectric sensors, and magnetoelectric sensors. Photoelectric sensors or magnetoelectric sensors are susceptible to body vibration when measuring the speed of high-speed rotating objects, and their reliability is poor. Although the Hall sensor using permanent magnets as the sensing element has fast response speed and easy signal processi...

AI Technical Summary

Problems solved by technology

When photoelectric sensors or magnetoelectric sensors measure the speed of high-speed rotating objects, they are easily affected by body vibration and have poor reliability.

Although the Hall-type sensor using a permanent magnet as the sensing element has fast response speed and easy signal processing, the effective sensing distance of the sensor is too short and the temperature stability is poor.

For micro-turbojet engines, the speed is as high as hundreds of thousands of revolutions, and the ambient temperature is high, the vibration is severe, and the reliability requirements are high. Traditional measurement methods have been difficult to meet the requirements.

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