Servo driver selection 6 key parameters

A servo system is a feedback control system that precisely follows or reproduces a certain process. The servo system enables the position, orientation, status, etc. of the object to output an automatic control system in which the controlled variable can follow any change in the input target (or given value). Its main task is to amplify, 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 are very flexible and convenient.

The servo driver is a part of the servo system and is used to control the servo motor. Its function is similar to that of the inverter in an ordinary AC motor and is mainly applied to a high-accuracy positioning system. Generally, servo motors are controlled by position, speed, and torque to achieve high-precision drive system positioning. Currently, it is a high-end product of transmission technology.

Selecting a suitable servo driver needs to consider various aspects. This is mainly based on the requirements of the system. Before the selection, first analyze the following system requirements, such as size, power supply, power, control mode, etc., and set the direction for the selection. . Let's take a look at the various parameters of the servo drive.

1. Continuous current, peak current;

2. Supply voltage, control part supply voltage;

3. Supported motor types, feedback types;

4. Control mode, accept the form of the command;

5. Communication protocol

6. Digital IO

Based on this information, we can roughly select the servo drive that matches the motor. In addition, we must pay attention to the working environment, temperature and humidity conditions, and whether the installation is suitable for the size.

The choice of driver is not only to consider whether the driver is matched with the motor, but also to consider the control method. Servo drive has three control modes: position, speed, torque mode. Torque mode and speed can be set by the external analog input or communication command. Position mode is to determine the speed and length of the movement by the frequency and number of pulses. In torque mode, the motor outputs a fixed torque, which cannot control the position and speed. Position mode has strict control of speed and position and is generally used for positioning devices. According to the needs of the system, and the upper control type, choose the appropriate control method.

Now more and more intelligent servo drives, not only support various types of servo motor, but also compatible with many types of feedback, can receive analog, PWM, pulse + direction and software commands, communication supports CANopen, Ethercat and so on. Provides three-loop control and commutation functions, intelligent one-key tuning and more. It is very convenient to use and has high control accuracy, which greatly improves the performance of the system and saves a lot of time for developers.

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