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An Absolute Capacitive Angle Displacement Measuring Sensor

A technology of displacement measurement and capacitance angle, which is applied in the direction of converting sensor output, using electric/magnetic devices to transmit sensing components, measuring devices, etc., which can solve the problems of sensitivity to electromagnetic environments, complex demodulation circuits, and limited ability to obtain angular displacement information.

Active Publication Date: 2019-04-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are many kinds of rotation angle displacement sensors on the market. According to the detection principle, they can be divided into optical encoders and magnetic encoders. Among them, optical rotary encoders are widely used, followed by magnetic encoders. The existing angular displacement measurement The sensor has high precision, but has disadvantages such as relatively large volume, complex processing, high cost, harsh environmental requirements, and poor dynamic characteristics. For example, magnetic encoders are complex in processing, high in cost, heavy in weight, and sensitive to electromagnetic environments. The lower capacitive angular displacement sensor has high stability, can be used for non-contact measurement, has good dynamic response, and adapts to harsh environments. It has been considered by more and more people to be the most promising sensor.
[0004] At home and abroad, there are many studies on capacitive sensors used to measure angular displacement, and great breakthroughs have been made, mainly focusing on the improvement of sensitive structures. The conventional sensitive structure is a fan-shaped split-lobe type, and the ability to obtain angular displacement information is limited. Sensitivity is also limited by processing accuracy, and the demodulation circuit is complex, so absolute angular position measurement cannot be achieved. Most capacitive angular displacement sensors can only be used for relative measurement, and the dynamic range is limited

Method used

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  • An Absolute Capacitive Angle Displacement Measuring Sensor
  • An Absolute Capacitive Angle Displacement Measuring Sensor
  • An Absolute Capacitive Angle Displacement Measuring Sensor

Examples

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Effect test

Embodiment 1

[0063] Such as figure 1 As shown, the absolute capacitive angular displacement measurement sensor of the present invention includes a sensitive structure 1 , a signal modulation and demodulation circuit 2 and an error compensation and fusion module 3 .

[0064] Such as figure 2 As shown, the sensitive structure 1 includes a first stator 11, a rotor 12 and a second stator 13, and the ring-shaped first stator 11, the ring-shaped rotor 12 and the ring-shaped second stator 13 have the same shape and size and are arranged longitudinally and parallel in sequence.

[0065] Such as image 3 As shown, the first stator 11 includes a precise measurement collection electrode 111, a precise measurement excitation electrode 112 and a first charge amplifier (not shown in the figure); the first charge amplifier is fixedly arranged at the bottom of the first stator 11, and the first stator The ring-shaped precision measurement collection electrode 111 is arranged on the outside of the top o...

Embodiment 2

[0124] The structure of this embodiment is basically the same as that of Embodiment 1, the difference is that in this embodiment, the three-piece ring-shaped first stator 11, ring-shaped rotor 12 and ring-shaped second stator 13 of the same size in Embodiment 1 are replaced by a double-piece type An annular stator 14 and an annular rotor 15 of the same size, such as Figures 14 to 17 As shown, the stator 14 and the rotor 15 are arranged in parallel and at intervals. The stator 14 includes fine measurement collecting electrodes 141, excitation electrodes 142, rough measurement collecting electrodes 143 and charge amplifiers (not shown in the figure), and the rotor 15 includes fine measurement sensitive electrodes 151, Coupling electrodes 152 and coarse measurement sensitive electrodes 153; the bottom of the stator 14 is fixedly provided with a charge amplifier, and the top of the stator 14 is sequentially provided with ring-shaped precise measurement collection electrodes 141, r...

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Abstract

The invention relates to an absolute capacitive angular displacement measurement sensor, which is characterized in that it includes a sensitive structure, a signal modulation and demodulation circuit, and an error compensation and fusion module; the sensitive structure includes a first stator, a rotor and a second stator arranged in parallel longitudinally; The fine measurement acquisition electrode is set on the outside of the top of the first stator, the fine measurement excitation electrode is set on the inside of the top of the first stator; the fine measurement sensitive electrode is set on the outside of the bottom of the rotor, the fine measurement coupling electrode is set on the inside of the rotor bottom, and the coarse measurement sensitive electrode is set on the outside of the rotor top , the coarse measurement coupling electrode is set on the inner side of the top of the rotor, the fine measurement / coarse measurement sensitive electrode and the fine measurement / coarse measurement coupling electrode are equipotential bodies; the coarse measurement collection electrode is set outside the bottom of the second stator, and the coarse measurement The excitation electrode is measured; the signal modulation and demodulation circuit is used to measure the precise angular displacement and the rough angular displacement; the error compensation and fusion module is used to calculate the absolute angular displacement after error compensation, and the invention can be widely used in angular displacement measurement sensors.

Description

technical field [0001] The invention relates to an angular displacement sensor, in particular to an absolute capacitive angular displacement measurement sensor, belonging to the field of angular displacement sensors. Background technique [0002] Angular displacement sensor is a displacement sensor that converts physical quantities such as rotational angular position and angular displacement into electrical signals. It is a sensor used to detect angle, speed, length, displacement and acceleration in the field of automation. Its application is as large as CNC machine tools and robots. , packaging machinery, printing machinery, elevators, factory automation-related equipment position detection and transmission speed control, as small as the rotation measurement and control of office automation equipment such as disks and printers, has become an indispensable part of various fields. [0003] At present, there are many kinds of rotation angle displacement sensors on the market. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/30G01D5/241
CPCG01B7/30G01D5/2412
Inventor 张嵘周斌侯波宋明亮林志辉
Owner TSINGHUA UNIV