Capacitive non-contact angular position sensor

Abstract

A capacitive non-contact angular position sensor is composed of a casing, a rotating shaft, a metal moving sheet, a substrate printed with a capacitance plate, a signal processing circuit composed of a single chip and the like. The working principle is that capacitance is changed by changing a medium between capacitors through the metal moving sheet, and measurement, calculation and output of the capacitors are controlled by the single chip. The capacitive non-contact angular position sensor is structurally characterized in that one or more capacitance plates are arranged on the same plane or a curve face. The metal moving sheet completely separated from the circuit is fixed on the rotating shaft, and the metal moving sheet is used for changing the capacitance medium of the device. Due to the fact that a movable part of the sensor is not provided with a charged body, non-contact measurement is truly achieved. Indexes of sliding touch, service life, resolution ratio and the like of the sensor are the same as indexes of a grating encoder type angular position sensor, but cost of the sensor is only one half of that of the grating encoder type angular position sensor. The capacitive non-contact angular position sensor is particularly suitable for toning devices and peripheral equipment for game consoles needing manual operations.

Description

technical field [0001] The invention relates to a sensor for measuring the angular position of a rotating part, in particular to an improved variable capacity mode of a capacitive angular position sensor. The invention is especially suitable for occasions requiring frequent rotation and comfortable hand feeling, such as peripheral equipment and tuning equipment of game machines. technical background [0002] The current angular position sensors are resistive, rotary differential transformer, grating encoding and capacitive. in: [0003] 1. The resistive angular position sensor has a simple structure, low manufacturing cost, and a wide temperature range, but the measurement angle is less than 360°, so it cannot be used for continuous rotation measurement, and the signal-to-noise ratio of the output signal is low. Due to the mechanical contact of the conductor , poor hand feeling and short service life. [0004] 2. The rotary differential transformer-type angular position s...

AI Technical Summary

Problems solved by technology

[0003] 1. The resistive angular position sensor has a simple structure, low manufacturing cost, and a wide temperature range, but the measurement angle is less than 360°, so it cannot be used for continuous rotation measurement, and the signal-to-noise ratio of the output signal is low. Due to the mechanical contact of the conductor , poor feel, short service life

[0004] 2. The rotary differential transformer type angular position sensor has high measurement accuracy, strong adaptability to ambient temperature, and a wide range of temperature changes, but the measurement range is narrow, and the structure and manufacturing process are complex, so the manufacturing cost is high

[0005] 3. The grating encoder type angular position sensor has fast response and high precision, but it is greatly affected by ambient temperature, vibration and humidity conditions, and the price is relatively expensive

Its advantage is that it has a certain ability to adapt to harsh environments, and has high precision and resolution, but because one of the capacitor plates is connected to the rotating parts, the sensing angle and durability are limited.

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