Flexoelectric passive torque sensor

Abstract

The invention discloses a flexoelectric passive torque sensor, which comprises a sensing unit, electrodes, a charge amplifier, a signal processing circuit and a storage and display unit, wherein the sensing unit is provided with a clamping end and concentric through holes and has a big flexoelectric coefficient; the electrodes are attached to the inner walls of the through holes of the sensing unit and the outer part of the sensing unit; the charge amplifier is electrically connected with the electrodes; the signal processing circuit is electrically connected with the charge amplifier; the storage and display module is electrically connected with the signal processing unit; when the clamping end of the sensing unit loads a torque, the inner wall of each through hole of the sensing unit generates a strain gradient along the radial direction; due to a flexoelectric principle, corresponding polarization charges are directly generated on the sensing unit, and a value of the torque loaded on the clamping end is obtained by a charge signal. The torque loaded on the sensing unit can be measured by being converted into the radial direction strain gradient; meanwhile, since the sensing unit has the big flexoelectric characteristics, sensitive elements do not need to be pasted, the measuring mode of the sensing unit is passive measurement, and the applicable range of the sensor is enlarged.

Description

technical field [0001] The invention relates to the technical field of torque sensors, in particular to a flexoelectric passive torque sensor. Background technique [0002] The current torque sensor mostly adopts the following measurement modes: potentiometer type, resistance strain gauge type, non-contact type, etc. The potentiometer torque sensor converts the torque linearly into the rotation angle through the torsion bar spring, and converts the rotation angle into the axial displacement through the mechanical structure, and then changes the resistance value by pushing the slider, and then converts it into the corresponding voltage through the potentiometer The resistance strain gauge torque sensor achieves indirect measurement of torque by pasting a resistance strain gauge on the elastic shaft; the non-contact torque sensor changes the corresponding induced voltage by changing the magnetic induction intensity, thereby indirectly measuring the torque. The above measureme...

AI Technical Summary

Problems solved by technology

However, none of the above methods of measuring torque can realize the passive measurement of the sensing unit, that is, directly and accurately obtain the torque result without pasting the sensitive element on the surface of the deformed structure and without supplying power to the sensing element

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