Servo controllers and frequency converters are both electronic devices used to control motors, but their functions and application scenarios are different. The specific differences are as follows:
Different control methods
A servo controller is a high-precision motor control device that achieves precise motion control by precisely controlling parameters such as motor position, speed, and acceleration. Usually, servo controllers use closed-loop control, which compares the feedback signal of the encoder or position sensor with the expected control signal to adjust the output signal to control the motor.
The frequency converter is a commonly used speed control device that adjusts the motor speed by changing the voltage and frequency of the motor, thereby achieving the purpose of speed control. Usually, frequency converters use open-loop control, which adjusts the motor speed only by controlling the size and frequency of the output signal.
Different application scenarios
Servo controllers are suitable for automation equipment with high precision requirements, such as CNC machine tools, printing machines, robots, etc. Due to the high-precision control of parameters such as position, speed, and acceleration of the motor by the servo controller, it can meet the requirements of these devices for accuracy and stability.
Frequency converters are suitable for equipment that requires high rotational speed, such as fans, water pumps, conveyors, etc. Due to the fact that frequency converters can achieve motor speed regulation by adjusting voltage and frequency, they can meet the requirements of these devices for speed and energy consumption.
Different control precision
The control accuracy of servo controllers is generally higher than that of frequency converters, which can achieve more precise motion control. For example, the position control accuracy can reach 0.001mm level, and the speed control accuracy can reach 0.001rpm level.
The control accuracy of the frequency converter is relatively low, usually achieving a speed control accuracy of less than 5%, which is suitable for equipment with low requirements for control accuracy.
In short, servo controllers and frequency converters have their own advantages and disadvantages in motor control, and appropriate equipment should be selected according to specific application scenarios.
