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Capacitor torque sensor

A torque sensor and capacitive technology, applied in the field of capacitive torque sensors, can solve problems such as inability to track rotation, large sensor size and weight, and complex structure

Inactive Publication Date: 2015-11-11
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of sensor does not need an additional power supply system, the circuit structure is simple, the output power is large, the reliability is high, and it has a frequency response within a certain range (generally 10 to 1000Hz), but the size and weight of this type of sensor are relatively large
[0006] Capacitive torque sensor, Chinese patent CN102636193A, discloses a double-connected differential capacitive sensor. The number of teeth of the sensor is fixed, the structure is simple, but the sensitivity is not high, and the driving shaft and the driven shaft cannot be tracked.
Chinese patent CN2929648Y discloses a capacitive relative angle sensor. Its structure is too complicated, and the angle detection range is only limited to 5°. Although the relative tracking rotation between the driving shaft and the driven shaft can be realized, the variable capacitance after tracking The capacitance of the variable capacitance has changed, and the variable capacitance returns to the initial state after tracking cannot be realized like the present invention
U.S. Patent US6955097B1 discloses a radially movable capacitive torque sensor. The differential capacitance information processing is similar to the principle of the present invention, but the mechanical structure is completely different, and the driven stage and the active stage cannot track the rotation like the present invention.

Method used

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Examples

Experimental program
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Embodiment 1

[0047] Such as Figure 1 to Figure 12 As shown, the capacitive torque sensor of the present invention includes an active stage 1, a driven stage 2, and a capacitance information acquisition circuit 3, in which:

[0048] The active stage 1 includes an active stage cylinder 1-1, which is located inside the active stage cylinder 1-1 for connecting with the active shaft; T active stage metal teeth are arranged on the side surface of the active stage cylinder 1-1 Pieces 1-2, where T is an integer ≥ 2. In this example, the number of active metal gear pieces 1-2 is 12, that is, T=12. Of course, any number of integers T ≥ 2 can be selected according to actual needs; The active metal sprocket 1-2 has an arc-shaped rectangular structure. Seen from the bottom of the active cylinder 1-1, the radian angle formed by the active metal sprocket 1-2 and the center of the bottom surface is 15°. The active metal sprocket 1-2 is evenly distributed on the side surface centered on the center of the ac...

Embodiment 2

[0054] Example 2 is similar to Example 1, as Figure 13 As shown, the difference lies in: in this embodiment, the active stage cylinder 1-1 of the active stage 1 is located inside the driven stage cylinder 2-1 of the driven stage 2, and the metal gear plate 2-2 of the driven stage Between the active metal sprocket 1-2 and the active metal sprocket 1-2 will form a structure opposite to the inside and outside of the sprocket; in this example, the number of the active active metal sprocket 1-2 is 14 pieces, that is, T=14, of course it can be based on actual needs Choose any number in the integer T≥2. The more the number of gears, the higher the accuracy of torque detection. Correspondingly, the number of metal gears 2-2 of the driven stage in this example is T / 2. That is 7 pieces.

[0055] In this example, the active metal sprocket 1-2 has an arc-shaped rectangular structure and is evenly distributed on the side surface centered on the center of the active stage. The driven metal sp...

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Abstract

The capacitor torque sensor belongs to the torque sensor field and provides a capacitance torque sensor. The capacitor torque sensor comprises a driving level, a driven level, and a capacitance information collection circuit; T driving level metal tooth sheets and two driving level metal circular rings are arranged on the side surface of the driving level which is connected to a driving shaft; T / 2 driven level metal tooth sheets and a driven level metal circular ring are distributed on the side surface of the driven level which is connected to a driven shaft; the centers of the columns of the driving level and the driven level are coaxial and can relatively rotate; the driving level is partially contained inside the driven level or the driven level is partially contained inside the driving level, so that the driving metal tooth sheets of the driving level and the driven metal tooth sheets of the driven level l are superposed and opposite; and a column-shaped capacitance information collection circuit sleeves the driving level and the driven level. The capacitor torque sensor is simple in structure, easy in installation, simple in technology, high in accuracy, long in service life, low in cost, high in reliability and wide in application range.

Description

Technical field [0001] The present invention belongs to the field of torque sensors, and specifically relates to a capacitive torque sensor that detects torque information according to a change in torque into a change in capacitance value. Background technique [0002] Torque sensors can be divided into contact type and non-contact type. Contact types include resistance strain gauge type and potentiometer type torque sensors, and non-contact types include magnetoresistive, photoelectric, capacitive, magnetoelectric torque sensors, and so on. [0003] Resistance potentiometer, which uses mechanical contact to trigger the potential change of the potential point. Due to the constant friction between the potentiometer, the ring and the fixed wall, the potentiometer and the ring will wear out, which greatly reduces the service life of the sensor. [0004] The principle of the photoelectric torque sensor is to convert the change of luminous flux into the change of electric signal intensi...

Claims

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Application Information

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IPC IPC(8): G01L3/10
Inventor 钟洪声刘俊汪玲
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA