JPS60139184A - Speed controlling method of motor - Google Patents

Abstract

PURPOSE:To accurately stop a motor at a target stopping position by providing the prescribed decelerating position, and gradually decelerating the motor from the position to stop it at the target stopping position. CONSTITUTION:The position and the speed signal of a moving turntable 16 detected by a position detector 10 is A/D-converted by an A/D converter 11, and the A/D-converted signal is calculated by a microcomputer 12. This signal is outputted as a pulse having a pulse width in response to the pulse width according to the calculated result, the pulse is amplified by an amplifier 13, inputted to a drive motor 14 of the table 16, which is moved through a moving mechanical unit 15 or the like. The moving distance of the table 16 is again detected at the position by the detector 10, and inputted through the converter 11 to the microcomputer 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is used, for example, in a center search record player, and drives a record eccentricity correcting device whose purpose is to align the center of a turntable with the center of a record. The present invention relates to a method for controlling the speed of a motor used to control the speed of a motor.

Conventional motors generally have a constant speed, so for example, as mentioned above, a motor is mounted on the turntable 1 of a center search record player as shown in FIG. A moving turntable (hereinafter referred to as moving T, T) 3, a moving mechanical unit 4 that moves on the moving T, T, 3, and a moving mechanism unit 4 that is placed on the moving T, T, 3 and plays a record A. When used as a motor for driving the moving mechanical unit 4 of the eccentricity correcting device 6, which is equipped with a rubber sheet 5 that can be placed, as shown in FIG. Even if you turn off the power to the motor at 0, a certain amount of overshoot S will occur due to inertial rotation, and even if you try to take this overshoot S into account, turn off the motor a little before the stop position 0. , since the amount of inertial rotation differs depending on the rotation speed of the motor and the state of the lubricating oil at that time, it is very difficult to accurately grasp the amount of overshoot S. Therefore, it is very difficult to accurately grasp the amount of overshoot S. There was a problem that it could not be stopped accurately at O.

This invention was made in view of the above-mentioned circumstances, and its purpose is to convert the output from a position detection means for detecting the position of a moving T, T, etc. into an AD converter using an A/D converter. The converted signal is sent to a microcomputer (
(hereinafter referred to as a microcomputer), converts it into a pulse according to the calculation result, and uses this pulse to control the speed of the drive motor of the movement T, T, etc., to move the movement T, T, etc. to a predetermined stop position. An object of the present invention is to provide a method for controlling the speed of a motor, which can accurately stop a motor.

The present invention will be described in detail below based on the accompanying drawings.

FIG. 3 is a schematic diagram showing the flow of signals in the speed control method according to the present invention. In the drawing, reference numeral 10 denotes a position detecting device which is a position detecting means for detecting the position and speed of the moving T, T, etc. The position and speed signals of the moving T, T, detected by the device 10 are AD converted by the A/D converter 11, and the AD converted signal is calculated by the microcomputer 12, and the pulse width is adjusted according to the result. Output as a pulse,
The pulse is amplified by the amplifier 13 and then moved T, T
is input to the drive motor 14 of , and the movable parts T, T, and 16 are moved via the moving mechanical unit 15 and the like. The displacements of the movements T, T, 16 are detected again by the position detection device 1°, and are inputted to the microcomputer 12 via the A/D converter 11.

Next, the control method according to the present invention will be explained using a flowchart shown in FIG.

■ Operation: When the motor is started, the movement T, T, 16 position device in the starting state is the position detection device 1.
Detected by 0.

Based on the detection signal, the microcomputer 12 moves T, T,
Sixteen target stop positions are calculated.

■ Operation: When the target position is calculated, the microcomputer 12
Acceleration pulse P shown in FIG.

4- is the direction in which is output (Yes direction) or has already moved T
, T, 16 is at the target stop position, go to the No direction and proceed to the main program.

■ Operation: The time to output the speed-up pulse P1 is set.

■ Operation: Speed-up pulse P is output from the microcomputer 12.

■ Operation: Move T by acceleration pulse PI.

T, 16 is moved, the moved position is detected by the position detecting device 10, and it changes with the program step of the microcomputer 12, but the amount of movement is always measured by the microcomputer 12 within several seconds using the output signal of the position detecting device 10. be done.

■ Operation: Determines whether the acceleration pulse P is the first output, and if Yes, moves to the ■ operation described later, and the difference between the target stop position and the current position of movements T, T, 16 is determined by the microcomputer. 12, and in the case of No -ζ -, the operation shifts to ■.

■ Operation: Movement T, T, 1 due to previous acceleration pulse P+
The difference between the amount of movement in step 6 and the same amount of movement this time is microcontroller 1.
It is calculated by 2.

■ Operation: ■ The calculation result of the operation is judged by the microcomputer 12, and if the calculation result is positive (in the case of No direction), it is shifted to the O operation described later and it is determined whether the movement T, T, 16 is at the predetermined position. (@ operation), and if the calculation result is negative (in the Ves direction), the operation is shifted to (2) operation.

(2) Operation: An output timer is set which determines the output time of the deceleration pulse P2 (shown in FIG. 4).

[Phase], Operation: The deceleration pulse P2 is output for the set time. As shown in FIG. 4, the movement T is caused by the motor 14 accelerated by the acceleration pulse P.
,T.

16 may also be accelerated. Move T, T.

When the motor 6-16 is accelerated, this deceleration pulse P2 is outputted for an appropriate period of time, so that the rotational speed of the motor 14 is gradually slowed down.

O operation: movement T by the position detection device 10.

The position of T, 16 is detected, and the difference between the current position and the target stop position is calculated by the microcomputer 12.

(2) Operation: It is determined whether or not the vehicle is at a predetermined deceleration position by the calculation in the above (2) operation. If it is at a predetermined deceleration position, it moves to the ■ operation described later (Yes direction), and if it is not at a predetermined deceleration position, it moves to the above-mentioned ■ operation (No direction), and it is determined whether or not an acceleration pulse should be output. , depending on how the subsequent action is performed again,
It is assumed to be a predetermined deceleration position.

O operation: The microcomputer 12 determines whether the movement T, T, 16 is at the target stop position. If it has reached the target stop position, 7- is transferred to the main program (Was direction), and if it has not reached the target stop position, it moves to the e operation described later (No direction), and reduces the coefficient of the output timer. After reducing the pulse output time, it is returned to ■ operation again.
The θ operation from ■ is repeated until the movements T, T, and 16 reach the target stop position.

To explain these operations using the graph shown in Figure 5, when the motor is started, the target position is calculated by the ■ operation, and when the acceleration pulse is output by the ■ operation, the motor rotation speed is increased and kept constant. The number of rotations is assumed to be .

And the movement T, T moved by the rotation of the motor
, 16 reach the predetermined deceleration position, the @ action causes
The pulse output time is gradually shortened, and the acceleration pulse and deceleration pulse are output alternately (depending on the ■ operation), and as shown in Fig. 5, the pulse is gradually tilted downward, and the final Specifically, the movement T, T, 16 is accurately stopped at the target stop 8-position O.

As described above, the control method according to the present invention provides a predetermined deceleration position and gradually decelerates from that position to stop the motor at the target stop position, so the inertial rotation just before stopping can be considerably reduced. The motor can be accurately stopped at the target stop position.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an eccentricity correcting device for a center search record player that can use a motor controlled by the control method according to the present invention, and FIG. 2 is a sectional view showing the amount of movement relative to the rotational speed or movement speed of the motor according to the conventional control method. 3 is a schematic diagram showing the signal flow according to the control method of this invention, FIG. 4 is a diagram showing pulse waveforms according to the control method of this invention, and FIG. FIG. 6, which is a graph showing the amount of movement relative to the number of revolutions or the movement speed, is a flowchart of the control method of the present invention. In addition, in the drawing. 10 position detection means (position detection device) 11 A/D converter 13 microcomputer 14 motor PI, P, pulse. Patent Applicant: Fujia Audio Co., Ltd., W.C., Chu-Kikaisoune #1, Request for Complaint, B.A. Procedural Amendment (Voluntary), June 6, 1980, Commissioner of the Japan Patent Office, Kazuo Wakasugi, Case 1. Indication of 1987 Patent Application No. 187718 2, Title of Invention: Motor Speed Control Method 3, Relationship with the Amendment Person Case Patent Applicant. Name: Fuja Audio Co., Ltd. 4, Agent (6, Contents of amendment) “Accurate” on page 2, line 18 of the specification is corrected as follows. Correct as expected.

Claims (1)

[Claims] The output from the position detection means is converted into an A/D converter.
A method for controlling the speed of a motor, which comprises performing D conversion, calculating this AD converted signal by a microcomputer, converting it into a pulse according to the calculation result, and controlling the speed of the motor using the pulse.