A servo system consists of three parts: a motion motor, a driver, and an encoder. Its motion process is as follows:
First, a controller like a PLC sends command data to a servo driver via a bus. The servo driver then sends a pulse to rotate the rotor of a motion motor. The speed, position, and force of the motor's rotation are all contained within the pulse sent by the driver.
While the motor receives the pulse signal from the driver to do work, it also sends a pulse back to the driver, thus achieving a closed-loop control, rather than the driver unilaterally sending information to the motor.
If the two pulses are completely identical, it proves that the motor is strictly following the PLC's control instructions. If there is a difference between the two pulses, the servo encoder needs to correct the error until the two pulses are identical.
Because of the closed-loop control described above, the motion accuracy of servo motors is far superior to other types of motors, and they can be applied to a wider range of projects. Of course, their manufacturing cost is often also higher, so you should choose based on your actual needs.
