This circuit consists of a negative pulse oscillator (NAND gate IC 1A and IC1D), and an RS flip-flop (NAND gate IC1B and IC 1C). The servo control signal is output from pin 6 of the RS flip-flop.
The oscillator outputs a negative pulse signal with a repetition rate of approximately 50 Hz. These narrow pulses are sent to the input of the flip-flop and are triggered every 20ms. When the negative pulse reaches the trigger input (pin 4), the output of IC 1C goes low. C3 is discharged through Pl, the state of the flip-flop is restored after discharge, and the output of IC1B returns from low level to low level, repeating every 20ms. The recovery time of the state is adjusted by P1.
The servo controller is a commonly used closed-loop control system, which sends different pulses to the servo controller to achieve different speed position control. Generally, it is pulse and analog control. It has speed PID torque PID. The servo also has feedback. It compares the feedback signal and the output signal. It has good switching control and high precision.
Closed-loop control system: Closed-loop control system, also known as feedback control system, is an automatic control system that consists of a signal positive path and a feedback path to form a closed loop. This is an automatic control system that includes power amplification and feedback so that the value of the output variable responds to the value of the input variable. After the numerical control device issues a command pulse, when the command value is sent to the position comparison circuit, if the table does not move, that is, when there is no position feedback signal, the command value causes the servo drive motor to rotate, and the gear is driven by the gear, the ball screw nut, and the like. The component drives the machine table to move. The position measuring component mounted on the machine table, after measuring the actual displacement of the table, is then fed back to the comparator of the numerical control device for comparison with the command signal, and is controlled by the compared difference. If there is a difference between the two, after amplification by the amplifier, the servo drive motor is controlled to rotate until the difference is zero, and the table stops moving. This type of system is called a closed loop servo system.
With the component values ​​in the figure, the state recovery period of the RS trigger can be adjusted from 0.6 to 2ms with P1, and the corresponding servo machine can be rotated by 120 °.
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