JPS60165712A - Method of automatically regulating variable regulation part - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention Technical Field The present invention relates to an automatic adjustment method for variable adjustment parts, and in particular, a method for automatically adjusting variable adjustment parts such as variable capacitors, variable resistances, variable coils, etc., which have a rotation adjustment part using a pulse motor. It concerns a method of automatic adjustment.

Background Art In a device that automatically adjusts variable adjustment parts, for example, a device that automatically adjusts a variable capacitor in an RF circuit of an AM tuner, backlash that exists in the rotation system is
The adjustment error due to this becomes a problem. FIG. 1 is a block diagram showing a control system that automatically adjusts the variable capacitor of the RF circuit of the AM tuner.
The variable capacitor 3 of the circuit is rotated in steps by a pulse motor and driver bit 4, and its output is sent to a level meter 5.
The controller 6 processes the obtained data, controls the pulse motor, and adjusts the variable capacitor 3.

The variable tuner 3 of the A, M tuner 2 consists of a fixed electrode 7 and a movable electrode 8, as shown in FIG. 2(a), and the movable electrode 7 has a rectangular shape as shown in FIG. 2(b). A groove 9 is provided. The driver bit 12 fixed to the rotating shaft 11 of the pulse motor] O is inserted into the groove 9 of the movable electrode 8 of the variable capacitor 3, and the pulse motor is rotated step by step to rotate the movable electrode 8. I am trying to change the capacity of. In such a rotating system consisting of the pulse motor 10, the driver bit 12, and the variable capacitor 3, there is a backlash of the rotating shaft 11 of the pulse motor, and a backlash between the driver bit 12 and the groove 9 of the movable electrode 8. exists.

In FIG. 2(b), the positive backlash between the driver bit 12 and the groove 9 is indicated by 13, and the negative backlash is indicated by 14. Due to the presence of such surface backlash, a situation occurs in which the movable electrode 8 of the variable capacitor does not rotate even though the pulse motor 10 is rotating. Therefore, automatic adjustment of the variable capacitor in the control system of FIG. 1 has the following drawbacks.

For automatic adjustment, the pulse motor 10 is rotated step by step from the origin position, for example, in the positive direction, and during this time, the output of the tuner 2 is sampled by the level meter 5 at each rotation step of the pulse motor, and the obtained data is The control unit 6 processes the pulse motor to determine an adjustment target value, rotates the pulse motor in the reverse direction, that is, in the negative direction, and stops the pulse motor to a target position corresponding to the target value.

FIG. 3 is a graph showing the state of sampling in the level meter 5. The horizontal axis shows the pulses supplied to the pulse motor, and the vertical axis shows the output of the AM tuner 2. The pulse motor 10 uses these pulses P. IP
I...PtL is supplied to rotate at a constant step Pst, and sampling is performed step by step in response to these pulses, so the horizontal axis in FIG. 3 also represents the sampling step. Moreover, this pulse also corresponds to the rotational position of the pulse motor. In FIG. 3, sampling step P. + P 1...PfL
The sampling value of the output of AM tuner 2 sampled at , Dl...D? It is assumed that the output level D3 is the maximum in step P3.

This data from the level meter 5 is processed by the control unit 6, and the adjustment target value of the variable capacitor is the maximum output level D3,
The corresponding adjustment target position of the pulse motor is position P3.
determine that

When rotating the pulse motor in the negative direction, the control unit 6 instructs the number of rotation steps to ΔD-Pa=C%3) Pst,
After rotating by the number of steps ΔD, it is stopped and the pulse motor is adjusted to the target position so that the maximum output can be obtained from the AM tuner 2.

However, in this automatic adjustment method, the pulse motor 1
When the rotation of 0 is reversed, the movable electrode 8 of the variable capacitor 3 cannot be returned to the target position P3 due to the influence of paraclarity as described above, and therefore the maximum output cannot be accurately reproduced. . Therefore, there is a drawback that the adjustment accuracy cannot be improved.

SUMMARY OF THE INVENTION An object of the present invention is to propose an automatic adjustment method for variable adjustment parts capable of absorbing backlash in a rotating system in order to improve the above-mentioned drawbacks. Therefore, according to the present invention, The pulse motor is rotated step by step in one direction from the origin position to the final position, and during this period, the output related to the variable adjustment parts is sampled at each step, and from the obtained data, the target of the pulse motor corresponding to the target value of the variable adjustment parts is determined. The backlash of the rotation system is absorbed by determining the position, rotating the pulse motor in steps in the opposite direction from the final position, returning to the original position, and then rotating in steps in one direction to the target position.

Embodiment An embodiment of the automatic adjustment method for a variable adjustment component according to the present invention will be described with reference to the case where it is applied to the control system shown in FIG.

FIG. 4 is a graph for explaining the principle of pack lasochy absorption in this embodiment, and the horizontal axis is the pulse motor 1.
Pulse P supplied with 0Vc. +P1...8 is shown, and the pulse motor steps P every time a pulse is supplied.
It is rotated by st. On the other hand, the vertical axis indicates the rotational position of the movable electrode 8 of the variable capacitor 3.

This graph shows the origin position P of the pulse motor where the paraclarity in the positive direction is maximum. The pulse when rotating in the positive direction from to the final position P7L, further reversed, and returned in the negative direction by the number of steps in the positive direction (P?1.-Po) and the movement of the variable capacitor 3 that was actually rotated. It shows the relationship with the rotational position of the electrode 8.

The pulse motor 10 is at the origin position P. When starting step rotation in the positive direction from
Therefore, the movable electrode 8 of the variable capacitor 3 starts rotating with a delay. Further, when the pulse motor starts rotating in the negative direction from the final position, the movable electrode 8 of the variable capacitor 3 starts rotating with a delay due to the negative backlash 16 of the rotation system.

The positive direction backlash 15 and the negative direction backlash 16 cause the pulse motor 10 to dry.

The structures of capacitor 12 and variable capacitor 3 are almost the same. Therefore, when the pulse motor 10 is rotated in the negative direction by the number of steps (P, -Po), the positive direction banklash 15 and the negative direction backlash 16 are canceled out, and the movable electrode 8 of the variable capacitor 3 moves to the origin 0.
In other words, it returns to the original position where the backlash in the positive direction is maximum.

Based on the above facts, when the pulse motor 10 is rotated stepwise in the forward direction, the position P3 of the pulse motor where the output of the AM tuner 2 is maximum, and therefore the position A3 of the movable electrode 8 of the variable capacitor, is detected by sampling. If this is done, after the movable electrode 8 of the variable capacitor returns to the origin O, the pulse P will be applied to the pulse motor. It can be seen that the maximum output point (P3.A3) can be reproduced by supplying from P3 to P3, stepwise rotating in the positive direction again, and stopping.

Therefore, according to the method of this embodiment, (1) the origin position P at which the backlash of the pulse motor 10 in the forward direction is maximum; (2) The output of the AM tuner 2 is sampled at each step position of the pulse motor by the level meter 5, and the obtained data is sent to the control unit 6. (3) The control unit 6 detects the position of the pulse motor where the output of the AM tuner 2 is maximum from the supplied data, and (4) After the pulse motor 10 has rotated to the final step position, the The origin position P in the direction. (5) The pulse motor is at home position P. When it returns to normal, it is rotated in the forward direction to the adjustment target position detected in the process (3) above and stopped.

According to this embodiment, as described above, the positive direction backlash 15 and the negative direction backlash 16 are canceled out.
That is, since backlash is absorbed, the maximum output point (P3.A3) is accurately reproduced.

In the above embodiment, the level meter 5 samples the output of the AM tuner 2, including the positive backlash 15.
Even though the pulse motor 10 rotates in the portion shown in FIG. 3, the movable electrode 8 of the variable capacitor 3 does not rotate, so it can be said that there is no need for sampling during this period. Another embodiment based on this idea will be described with reference to FIG. Figure 5 shows the fourth
This is a graph similar to the one shown in the figure. This embodiment is basically the same as the above embodiment, but the pulse motor 10 is moved to the origin position P.
. When starting to rotate in the forward direction from , a correction rotation is applied by the number of steps, ie, the number of pulses B, corresponding to the forward backlash 15vc expected in advance.

Due to this correction rotation, the sampling origin is set at the step position P where the positive direction balaclarity 15 is almost absorbed. '.

According to the method of this embodiment: (1) When rotating the pulse motor 10 in the forward direction, the origin position P; After rotating in the positive direction by the forward backlash correction value, the sampling origin position P is reached. ', the level meter 5 samples the output of the AM tuner 2 step by step, and (2) after the pulse motor 10 has rotated to the final position, the output is sampled by the backlash correction value + the number of steps (P?L-Po'). Rotate in the opposite direction to the origin position P
(3) Return the pulse motor 10 to the home position P. However, after rotating in the positive direction again by the positive backlash correction value, it is rotated in the positive direction and stopped at the adjustment target position P3t.

According to this embodiment, since unnecessary sampling can be reduced by 11-, it is possible to perform adjustment faster than in the previous embodiment.

In the above embodiments, a variable capacitor of an AM tuner has been described as an adjustment component, but any type of variable adjustment component having a rotation adjustment section such as a variable resistor or a variable coil may be used. Furthermore, in determining the adjustment target value of the variable adjustment component, in some cases it is possible to sample the variable value of the variable adjustment component itself in addition to sampling the output of the circuit in which the variable adjustment component is provided.

Effects According to the automatic adjustment method for variable adjustment parts of the present invention, the pulse motor is rotated in one direction from the origin position to the final position, then rotated in the opposite direction to return the pulse motor to the origin position, and then adjusted to the target position. As a result, paraclarity of the rotating system is absorbed, and adjustment errors due to paraclarity can be almost completely eliminated. Therefore, it is possible to obtain a highly accurate automatic adjustment method.

12-

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the control system that automatically adjusts the variable capacitor of the RF circuit of the AM tuner, Fig. 2 is a diagram showing the rotation system including the pulse motor, and Fig. 3 is a graph showing the sampling state. FIG. 4 is a diagram for explaining the principle of one embodiment of the present invention, and FIG. 5 is a diagram for explaining the principle of another embodiment of the present invention. . Explanation of symbols of main parts 1...AM signal input section 2...AM tuner 3...Variable capacitor 4...Pulse motor and driver pit 5...Level meter 6゛...Control section 7... - Fixed electrode 8... Movable electrode 9... Groove 10... Pulse motor 11... Rotating shaft of pulse motor 12... Driver bit 13.15... Positive direction paraclarity 14, 16.
... Negative backlash applicant Pioneer Co., Ltd. agent Patent attorney Motohiko Fujimura

Claims (2)

[Claims] (1) A method of automatically adjusting a variable adjustment component having a rotation adjustment part to a target value by rotating the rotation adjustment part in steps with a pulse motor, in which the pulse motor is rotated in one direction from the origin position to the final position. rotate, during which the output associated with the variable adjustment component is sampled step by step,
The target position of the pulse motor corresponding to the target value of the variable adjustment part is determined from the obtained data, the pulse motor is rotated in steps in the opposite direction from the final position to return to the home position, and then stepped again in the one direction to the target position. An automatic adjustment method for a variable adjustment part, characterized in that backlash of a rotation system including a rotation adjustment part and a pulse motor is absorbed by rotation. (2) When rotating the pulse motor step by step in one direction from the origin position to the final position K, after adding correction rotation for the number of steps equivalent to the backlash, sampling is performed for each step, and the pulse motor is rotated in the opposite direction from the final position. 2. The automatic adjustment method for a variable adjustment component according to claim 1, wherein when the component is rotated stepwise in the direction and returned to the original position, a correction rotation is applied by the number of steps.