A rotary shaft potentiometer

Abstract

The invention discloses a rotating shaft-type potentiometer, which comprises a rotating shaft and a front housing, wherein the rotating shaft is installed on the front housing; a magnet that can interlock with the rotating shaft is arranged at the rear end of the rotating shaft; a chip board that corresponds to the magnet and converts magnetic flux to voltage signals is arranged on the rear side of the rotating shaft; a disc component is arranged at the rear part of the rotating shaft; the disc component can limit the forward movement of the rotating shaft on the front housing; in addition, an obstructing component is arranged between the magnet and the chip board; and a magnetic line of the magnet can penetrate through the obstructing component. Through the adoption of a non-contact structure, the service life is prolonged greatly; and the disc component is adopted to limit the rotating shaft to move forward, and the obstructing component is adopted to limit the rotating shaft to move backwards, so that the reliability of the rotating shaft is improved, and the stability of measuring data is improved.

Description

technical field [0001] The invention relates to sensor technology, in particular to a rotary shaft potentiometer. Background technique [0002] A potentiometer is a resistive element with leads and whose resistance can be adjusted according to a certain change rule. It usually consists of a resistor body and a movable brush or sliding system. When the brush moves along the resistor body, a resistance value or voltage that has a certain relationship with the displacement is obtained at the output end. That is, when a voltage is applied between the two fixed contacts of the resistor, the position of the contact on the resistor is changed by rotating or sliding the system, and a position corresponding to the position of the movable contact can be obtained between the movable contact and the fixed contact. into a certain relationship with the voltage. The potentiometer currently used is generally an electric shock potentiometer, which is composed of a resistive film and a cont...

AI Technical Summary

Problems solved by technology

Due to the frequent contact and direct friction between the contact and the resistance film, the resistance film is worn and scratched, so that the life of the potentiometer is not long

At present, the improvement of the potentiometer is mainly to protect the resistance film or the contact by adding a conductive protection device between the resistance film and the contact, so as to achieve the purpose of prolonging the life of the potentiometer, but it has not fundamentally solved the problem of the potentiometer being damaged by friction. long life problems

[0003] The Chinese patent number is 98212193.8, and the utility model patent named "inductive liquid level sensor" discloses an electromagnetic sensor with a slope-shaped iron core, which is characterized in that the displacement change is realized by changing the relative conductivity of the iron core in the coil It is mentioned in the instruction manual that: the shape of the iron core can be conical, circular, pyramid, pyramid, etc., and the linearity can be corrected by correcting the iron core, but no matter what kind of iron core is proposed in the instruction, it has a rigid structure. Strong and high cost. To correct the iron core, it can only be polished the overall slope of the iron core. As the manual says, the overall slope of the iron core is kept consistent. It is very difficult, so there is almost no such technical solution in the current electromagnetic sensors

But this invention has the following disadvantages: the first is that although the wear problem of the potentiometer has been solved, the sensor made by the principle of variable inductance has been applied in more and more fields, and its main function is to convert various physical characteristics It is an electrical characteristic, so as to realize the automatic detection of various parameters, but this patented technology is difficult to realize the precise adjustment of the potential level, let alone use the potentiometer to detect various parameters; the second is that the linearity is not easy to adjust, and the variable voltage Inductive sensors usually use solid iron cores, which have high requirements for the uniformity of core processing and coil winding

Although this invention has the characteristics of small size and low cost, it also has the following disadvantages: first, the structure is complex and there are many parts; second, the reliability is poor; third, the measurement accuracy is low and the error is large

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