The servo system consists of three parts: motion motor, driver, and encoder. Its motion process is as follows:
First, a controller such as PLC issues command data to the servo driver through the bus, and the servo driver sends a pulse to make the rotor of the motion motor rotate. The speed at which the motor rotates, its position, and the force at which it rotates are all included in the pulses sent by the drive.
When the motor receives the pulse signal from the driver to do work, it will also feed back a pulse to the driver to achieve a closed-loop control instead of the driver unilaterally sending information to the motor.
If the contents of the above two pulses are exactly the same, it proves that the motor works strictly according to the control instructions of PLC. If there is a difference between the two pulses, then the servo encoder is required for error correction until the two pulses coincide.
It is precisely because of the above closed-loop control that the motion accuracy of the servo motor is much higher than other types of motors, and there are more scene projects that can be applied. Of course, its manufacturing cost is often more expensive, and you should choose according to your actual needs.