JPH02294002A - Rotary potentiometer device - Google Patents

Abstract

PURPOSE:To improve control accuracy by outputting rotation angle information endlessly so that the pieces of rotation angle information are outputted after judging which of two types of output is selected according to respective output conditions of two potentiometers and performing continuous control. CONSTITUTION:When the pieces of electric rotation angle information are outputted endlessly by using rotary potentiometer devices PMs 1 and 2, both values of variable resistors VRs 1 and 2 are treated by an output signal treating part 9. When the pieces of rotation angle information are outputted by means of one of resistors, i.e., the variable resistor VR 1 and its value of output reaches a value exceeding the uppermost limit or a value not exceeding the lowest limit, output of the other side resistor VR 2 is outputted as one of the pieces of rotation angle information. Further, when the output value does not vary or both values undergo a rapid change, it is judged that rotating operation or both resistors VRs 1 and 2 is not performed and the values of previous times are outputted This action improves operating efficiency and controllability and also makes it possible to obtain highly accurate output.

Description

[Detailed description of the invention]

[Industrial Application Field] This invention is used as a main component of a servo mechanism that automatically controls the angle or position of an object, for example, and is used for deviation detection to detect deviation between an input signal and an output signal. Among electrical equipment, this article relates to rotary potentiometer devices, which are a typical example of electrical resistance detection elements. [Prior Art] Figure 6 is a front view of the exterior of an example of a conventional rotary potentiometer device. In the same figure, (1). (3)
is the input terminal, (2) is the output terminal, (0 is the shaft that controls the output), and (5) is the case that houses these. In the conventional serial type rotary potentiometer device as described above, generally the left Stoppers are built-in in both the rotating and clockwise directions, making endless rotation over 360° impossible.Also, there are known models that allow endless rotation by removing the stoppers.
Even in this endless rotation type, a discontinuous region of resistance value and an open region are formed in the region where rotation is prevented by the stopper. Next, we will explain the operation of the above configuration. By applying an input voltage to both ends of the resistance wire in a rotary potentiometer device and controlling the rotation of the internal brush through the shaft (0), an output voltage is obtained at the output terminal (2). Figure 7 shows the output voltage. This is an electrical characteristic diagram, and as is clear from the diagram, the discontinuous region and open region, that is, the range where the rotation angle (θ) of the brush is 3606 or O0, are dead zones, and the continuity of the output signal is affected. Therefore, the information obtained by operating the volume does not appear in the output. [Problem to be solved by the invention] Since the conventional rotary potentiometer device is configured as described above, the rotation angle information is not output in the dead zone. Therefore, there was a problem that continuity of control could not be obtained, and as a result, good operability and controllability could not be achieved.This invention was made to solve the above problems. The purpose of the present invention is to provide a rotary potentiometer device that can output rotation angle information endlessly and significantly improve control accuracy through continuous control. [Means for solving the problem] ] The rotary potentiometer device according to the present invention arranges two sets of potentiometers on the same control axis with a phase difference that prevents the dead zones of their respective outputs from overlapping each other, and adjusts the output state of each of these potentiometers. [
Effect] According to the present invention, two-phase outputs having a phase difference from each other can be obtained from two sets of potentiometers, and by selectively processing both output signals while monitoring the output values of these two phases, Electrical rotation angle information can be output endlessly. [Embodiment of the Invention] An embodiment of the invention will be described below based on the drawings. FIG. 1 is an external front view of a rotary potentiometer device according to an embodiment of the present invention, and FIG. 2 is a plan view thereof. (PM2) is a pair of potentiometers arranged coaxially in the upper and lower stages. (1). (3) is the input terminal of the upper potentiometer (old P). (4). (8) is the lower potentiometer (
PM2) input terminal, (2) is the output terminal of the upper potentiometer (PMI), (5) is the output terminal of the lower potentiometer (PM2), and each output has a 180' dead zone that does not overlap with each other. It has a phase difference. (7) is a double potentiometer (P old), (
A common shaft controls the output of PM2), (8) is a case that houses these, and (9) is an output signal processing section that processes the output. FIG. 3 is an internal configuration diagram of the rotary potentiometer device with the above configuration, in which (VRI) is a variable resistor that constitutes the upper potentiometer (PMI),
It consists of a resistance wire (lO) and a brush (l2) that is in sliding contact with it. (VR2) is the lower potentiometer (PM2)
), and consists of a resistance wire (tB) and a brush (13) in sliding contact with it. 180' so that there is no
It has a phase difference of Next, we will explain the operation of the above configuration. The above two variable resistors (VRI). (VR2) input terminal (1
), (3) and (4). When input voltage is applied to (8), the output voltages obtained at the respective output terminals (2) and (5) are as shown in the electrical characteristic diagram in Figure 4. When using such a rotary potentiometer device to endlessly output electrical rotation angle information, both of the variable resistors (VRI) . The flowchart of the program in the output signal processing section (9) that processes both signals of (VR2) will be explained below. This program always uses the variable resistor (VRI) as shown in the flowchart in Figure 5.
, (VR2), and in order to obtain continuity of the output signal, set an upper limit value to the output to avoid the vertical part (V) and dead band part (K) in the output characteristics shown in Figure 4. (WAX) and a lower limit (MIN). Rotation angle information is output from the output of one variable resistor (VRI), and the value of this output {VRI(n)} is the upper limit value (WA
X) or more or less than the lower limit value (WIN),
The value of the output from the other variable resistor (VR2) (VR2(
n)) is output as rotation angle information. Also, when the output value does not change or when both values suddenly change, use the variable resistor (V
RI), (VR2) have not been rotated and the previous value (VR1a(n) 1 or (VR2a
(n)} is output. In addition, in the above embodiment, two variable resistors (V old),
(VR2) (F) Phase Mtl 80' and L are also noted, but it does not have to be 180@, and as long as the phase difference does not overlap the dead zones, the rotation angle information can be used as in the above example. can be output endlessly.

【Effect of the invention】

As described above, according to the present invention, it is possible to endlessly output the electrical rotation angle information of the rotary potentiometer and obtain continuity of control, improving operability and controllability, and achieving high precision. It has the effect of being able to obtain output.

[Brief explanation of the drawing]

FIG. 1 is an external front view of a rotary potentiometer device according to an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG.
The figure is an internal configuration diagram of the rotary potentiometer device shown in Fig. 1, and No. 4v! J is an electrical characteristic diagram of the output, and Figure 5 is a flowchart of a program that processes this output signal. Figure 6 is an external front view of a conventional rotary potentiometer device, and Figure 7 is a diagram of the electrical characteristics of the output of the conventional device. (1)
．． (3). (4). (8)...Input terminal, (2
). (5)...Output terminal, (7)...Control shaft, (8)...Case, (9)...Output signal processing section,
(P old), (P?I2) ---Potentiometer. Note that the same symbols in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (1) Two potentiometers are arranged on the same control axis with a phase difference that prevents their dead zones from overlapping each other, and the values of the outputs from both potentiometers are monitored and one output is 1. A rotary potentiometer device comprising: an output signal processing section that outputs rotation angle information from the value of the other output when the value is greater than or equal to the upper limit value or less than the lower limit value.