KR940007623B1 - Training servo control method - Google Patents

Abstract

The control method has the function of automatic tracking reference voltage to cope with the characteristics variation of the servo motor. A microprocessor (1) produces the error signals from a reference voltage by receiving the speed control pulse signals from a drum motor (3) and a capstan motor (4). The maximum error and the average error are calculated to find the consecutive sign of errors to compensate the drum motor (3) and the capstan motor.

Description

Training servo control method

1 is a hardware diagram of the present invention.

2 is a flowchart of the microcomputer of FIG. 1.

* Explanation of symbols for main parts of the drawings

1: micom 2: video tape

3: drum motor 4: capstan motor

5: video block

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to all products using a motor, and more particularly, to a training sub-control method that enables precise control to be performed regardless of the precision of the motor in products requiring precision control such as video cassette recorders and camcorders. will be.

In general, all the motors have a process error according to the manufacturing and production process, there was a concern that the performance degradation and defective products caused by the motor in the production of the product.

Accordingly, the present invention provides a training servo control method for automatically tracking and compensating each reference with the reference characteristics of the motor by outputting an error voltage according to the characteristics of the motor. There is a purpose.

Hereinafter will be described in detail with reference to the accompanying drawings.

1 is a hardware configuration diagram of the present invention. As shown in FIG. 1, a drum speed control pulse (DFG) and a drum phase generated from a drum motor 3, a capstan motor 4, and a video tape 2 are shown in FIG. In the microcomputer (1) that receives the control pulse (DFG), the capstan speed control pulse (CFG), and the capstan phase control pulse (CTL) through the (A), (B), (C) and (D) terminals, respectively, The pulse width modulation error voltages (DPWM) and (CPWM) are supplied to the drum motor 3 and the capster motor 4 through the (F) and (G) terminals while providing a head switching signal to the video block 5 through the terminal. It was to provide.

Referring to the method operation of the present invention configured as described above in detail as follows.

First, the microcomputer 1 is controlled by the operation flowchart of FIG. 2, and the speed control pulse for one period of the motor generated when the drum motor 3 and the capstan motor 4 shown in FIG. The (DFG) and (CFG) signals are applied to the input side of the microcomputer 1 (A) (C) (step 101), and stored while calculating error values for different references (step 102).

Since there are n random error values for each reference, if it is not the end of the cycle, the program proceeds from step 103 to step 101 and repeats repeatedly until the end of the cycle.

After completion of the above program operation, the error value is checked against each reference. In step 104, the maximum error value and the average error value are compared (step 105). The error value is more than the error value, and the mechanical error is considered to be too severe or due to some inadequate cause, and the compensation is not made, for example, from start to a certain time or in mode switching.

In this case, since it is an error that can occur in refined words, it is regarded as good control and the range is set by the window of no compensation error (step 106), and when the range is exceeded, the investigation is conducted according to the directivity of each error code (step 106). 107) If any number of n errors is equal to or greater than the same number, + n compensation is performed for "+" compensation (step 109), -n compensation for "-" compensation (step 110), and the microcomputer 1 The pulse width modulation (PWM) error voltage is outputted to the drum motor 3 and the capstan motor 4 through the (F) and (G) terminals of.

As described above, the present invention is effective in eliminating defects caused by the motor and cost savings and the motor, which can be operated without limitation on the performance of the product without regard to the precision of the motor by the training servo control.

Claims (1)

In the training servo control method of a video cassette recorder requiring motor control, pulse control signals (DFG) and (DPG) during one cycle generated from the drum motor 3, the capstan motor 4, and the video tape 2 ), (CFG), and (CTL) are searched for the pulse signal for speed of the motor as the input terminal of the microcomputer 1, and different error values are calculated from the search and stored in the memory in the microcomputer 1; Checking an error value against each reference in the step and the contents stored in the memory; and the error checked contents are larger than the maximum error value and the average error value, and the maximum error value is larger. In the case of a no-compensation error window, and if the non-compensation error window is not the directivity of the error code, no compensation is performed and the average value is higher than the maximum error value. When the error value is small, the non-compensated error window, and the directivity of the error code, the head switching signal (HD / SW) and the drum motor (3) in the video block 5 are compensated with "+" or "-". And outputting pulse width modulation error voltages (DFWM) and (CPWH) to the capstan motor (4).