A servo driver, also called a servo controller or servo amplifier, is a device specifically designed for controlling servo motors, similar in role to a frequency converter for a regular motor. Only through a servo driver can we enable servo motors to change speed, position, and torque, thereby achieving precise control.
Since servo drives are so important, what requirements should we have for them? Let's put it simply:
1. The speed range of the servo drive must be wide enough. What's the point of having it if it always maintains the same motor speed?
2. The positioning accuracy of the servo drive must be high, since the biggest advantage of servo motors over other motors is their high control precision.
3. The servo driver should have sufficient transmission rigidity and high-speed stability; it should not break down after the motor has rotated a few times.
4. The servo driver should respond quickly, without overshoot, and reduce contour transition error.
5. The servo drive should have an overload capacity of more than 1.5 times for several minutes or even half an hour, and be able to withstand an overload of 4 to 6 times for a short period of time without damage.
6. The servo drive must have high reliability and be able to operate stably in complex environments with varying temperatures, humidity, and vibrations.
Common servo drives are quite large, with their size and weight often exceeding that of the motion motor itself. This isn't a problem if the control project doesn't have high space requirements, but what if the project space is limited? This necessitates miniaturizing the drive.
