JPS6222001A - Position detecting device - Google Patents

Abstract

PURPOSE:To perform position detection based upon a DC voltage by varying a position detection coil with the relative position of an object of the position detection to the position detection coil. CONSTITUTION:A diode 3 and a resistance 4 are connected in series, the position detection coil 5 is connected in parallel to them, and the both are connected to an AC power source 1 through a series resistance 2. Therefore, when AC characteristics Z of the coil 5 vary, a DC output voltage developed at the connection point between the diode 3 and resistance 4 varies. The AC characteristics Z are varied by varying the winding pitch of the coil 5 continuously to obtain a position detection signal corresponding to the DC voltage.

Description

[Detailed Description of the Invention] Conventionally, position detection means include a combination of a float with a built-in magnet and a reed switch sensitive to magnetism;
Alternatively, a method of determining the position by detecting changes in capacitance has been put into practical use.

However, in the former case, it is not possible to obtain a position signal continuously, and in the latter case, since it is assumed that the capacitance changes, it cannot be used unless specific conditions are met for the surrounding wall, etc. - The present invention was made to improve these drawbacks,
The alternating current characteristics of the position detecting coil are changed depending on the relative positional relationship between the position detecting object and the position detecting coil, and the alternating current characteristics of the position detecting coil are changed according to the relative positional relationship between the position detecting object and the position detecting coil. Examples will be described in detail.

First, Fig. 1 is a configuration diagram showing the principle of the present invention, in which a diode 3 and a resistor R2-4 are connected in series, a position detection coil 1-5 is connected in parallel with them, and both are connected with a series resistor R2.
It is connected to an AC power source -1-1 via 1--2.

Therefore, when the AC characteristic Z of the position detection coil-1-5 changes here, the DC output voltage -m-6 taken out from the connection point between the diode-3 and the resistor R2--4
It is clear that changes occur.

2 and 3 are diagrams showing means for changing the AC characteristic Z of the position detection coil 1-5. In FIG. --It's in 8. In this case, since the water-m-8 is a dielectric, it gives a large distributed capacitance to the submerged part of the position detection coil-5, and if the submerged part changes, the submerged part of the position detection coil-1-5 changes. AC characteristic Z changes.

In addition, in Fig. 3, the position detection coil-5 and the short link-1-9 are combined in an alternating current manner, and the short link-9 serves as a load for the position detection coil-1-5. If the degree of mutual union changes, the appearance will be 1
The AC characteristic Z of the position detection coil-5 changes.

FIG. 4 is a configuration diagram showing an embodiment of the present invention, in which an AC power supply,
The configuration of the output voltage and it\output voltage is as explained in FIG.

The winding pitch of the position detection coil-1-5 is continuously changed in the position detection direction.

Therefore, the degree of combination of the short link 9 shown in the partial sectional view with the position detection coil 5 changes depending on its position. Since the object to be positioned and the short link 9 are configured to interlock with each other by a mechanism not shown, a DC voltage 6 corresponding to the position of the object to be detected can be obtained.

Although we have explained an example in which the winding pitch of the position detection coil is changed, the winding diameter may also be changed, and if the 1-position detection coil is operating in a region that can be considered as a distributed constant type circuit, the winding pitch may be changed. There is no need to change etc.

A better combination of these relationships may be selected depending on the frequency of the alternating current to be used, the dimensional conditions of the position detection coil, the properties of the dielectric when the object is to be detected, etc.

Since the present invention is configured as described above, it is of great industrial value because continuous signals regarding the position can be obtained regardless of the material of the container peripheral wall or the properties of the object to be detected.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing the principle of the present invention. FIG. 2 is a partial configuration diagram illustrating a case where the object to be detected is a dielectric. FIG. 3 is a partial configuration diagram illustrating a case in which it corresponds to an arbitrary detected object. FIG. 4 is a configuration diagram showing an embodiment of the present invention. 1, AC power supply 2, resistor 3, diode 4, resistor 5, position detection coil B, DC output voltage 7, water tank 8, water 8, short link

Claims (1)

[Scope of Claims] 2-1 A power source that generates alternating current with a substantially constant frequency, means for dividing the alternating current and rectifying it to obtain a direct current voltage, and a position connected to the power supply so that the voltage dividing ratio changes depending on the alternating current characteristics. What is claimed is: 1. A position detection device comprising: a detection coil; the position detection coil or its apparent AC characteristics are changed depending on the relative position of an object to be detected with respect to the position detection coil; and a position detection signal based on a DC voltage is obtained. 2-2 Equipped with a power source that generates alternating current with a substantially constant frequency, means for dividing and rectifying the alternating current to obtain a direct current voltage, and a position detection coil connected so that the voltage dividing ratio changes depending on the alternating current characteristics, In a position detection device that changes the position detection coil or its apparent AC characteristics depending on the relative position of the object to be detected with respect to the position detection coil, and obtains a position detection signal using DC voltage, the winding pitch or winding diameter of the position detection coil is A position detection device characterized by continuously changing the direction of position detection. 2-3 Equipped with a power source that generates alternating current with a substantially constant frequency, means for dividing and rectifying the alternating current to obtain a direct current voltage, and a position detection coil connected so that the voltage dividing ratio changes depending on the alternating current characteristics, In a position detection device that changes the position detection coil or its apparent AC characteristics depending on the relative position of the object to be detected with respect to the position detection coil, and obtains a position detection signal using a DC voltage, A position detection device characterized in that it is equipped with a short link that is wound concentrically with a position detection coil and short-circuited at both ends at a high frequency, as a substitute for a position detection coil.