Six key parameters of servo driver selection

Editor:浙江汇迅骏机电技术有限公司 │ Release Time:2020-07-16 

A servo system is a feedback control system designed to accurately follow or reproduce a process. Servo system an automatic control system that enables the position, orientation, state and other output controlled quantities of the object to follow arbitrary changes in the input target (or a given value). Its main task is to magnify, transform and control the power according to the requirements of the control command, so that the torque, speed and position control of the output of the drive device is very flexible and convenient.  

Servo driver belongs to a part of the servo system, used to control the servo motor, its role is similar to the inverter on the ordinary AC motor, mainly used in high-precision positioning system. The servo motor is generally controlled by position, speed and torque in three ways to achieve high-precision positioning of the transmission system. It is a high-end product of transmission technology. 


The selection of a suitable servo driver requires consideration of all aspects, which are mainly based on the requirements of the system. Before selection, the following system requirements, such as size, power supply, power, control mode, etc. should be analyzed to determine the direction of the selection.  Let's take a look at the parameters of the servo drive. 

— Continuous current and peak current; 

— Power supply voltage and control part power supply voltage; 

— Supported motor type and feedback type; 

— Control mode and form of receiving orders; 

— Communication protocol; 

— Digital I/O. 

Based on this information we can roughly choose the servo drive that matches the motor.  In addition, but also pay attention to the working environment, temperature and humidity, installation is the size is appropriate. 


The choice of driver is not only to consider whether the driver is matched with the motor, but also to consider the control mode.  The servo drive has three control modes: position, speed and torque mode. Torque mode and speed can be set through external analog input or communication commands, while position mode is to determine the speed and length of motion through the frequency and number of pulses. Torque mode motor output a fixed torque, the position, speed can not control. Position mode has strict control over speed and position and is commonly used for positioning devices. According to the needs of the system, and the upper control type, choose the appropriate control mode.