Servo working principle and motion control method - Database & Sql Blog Articles

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The principle of the servo is simply a few words:

1. The inverter is the servo actuator;
2. The servo is an automatic control system that uses the position, orientation, and posture of the object as the control amount to form an arbitrary control system for tracking the target;
3. The inverter executes the commands such as opening, stopping, speed regulation and braking of the servo;
4. The servo detects the actual displacement of the feedback motor and the workpiece through the encoder, and the servo inputs the target control amount through the upper computer, and the target control amount-actual displacement amount=servo command;
5. For example:
1) Command pulse - feedback pulse = command pulse >> 0, start, accelerate;
2) Command pulse - feedback pulse = command pulse ≥ 0, decelerate, stop;
3) command pulse - feedback pulse = feedback pulse, reverse addressing;
6. The start and stop commands generated by the servo “command pulse-feedback pulse” are accurate, and the position of the actual start and stop of the motor controlled by the inverter is not at the given position, and it cannot be controlled!
7. Therefore, the servo implements precise commands for command and detection feedback, but does not achieve precise control of the motor;
8. The characteristic of the stepping motor is that the precise control of the motor is realized, and how many degrees are further determined before going forward;
9. If the start and stop commands generated by the servo "command pulse-feedback pulse" are used to directly control the stepping pulse current of the motor, the servo can not accurately control the defect of the motor, and the precise control of the motion is realized. !
What are the methods of motion control?

1. The method of motion control is simple. There are three types:
1) pulse stepper motor;
2) host computer + plc + encoder + speed motor;
3) PLC + position switch + ordinary (speed control) motor; 2. What motion control method for what movement:
1) For example, the embroidery process is suitable for: pulse step motion control mode;
2) For example, universal milling machine work table front and rear, up and down, left and right, rotation: PLC + position switch + ordinary (speed) motor
3) For example, the robot is applicable: PLC+ position switch + ordinary (speed) motor, host computer + PLC + encoder + speed control motor; 3, if your system uses PLC + position switch + ordinary (speed) motor is enough You use "PLC + position switch + ordinary (speed control) motor", this system is quick to change, agile, easy to use, operate, maintain, stable and reliable;