How to choose the appropriate servo motor?

Release Time：

2025-04-26

The field of automation is currently a hot topic, and servo motors play an important role in it, usually used to drive more precise speed or position control components in projects. Designers of automation equipment often need to face various motor selection issues with different requirements, and the motors provided by suppliers are also diverse.

How to choose the appropriate servo motor?
The field of automation is currently a hot topic, and servo motors play an important role in it, usually used to drive more precise speed or position control components in projects. Designers of automation equipment often need to face various motor selection issues with different requirements, and the motors provided by suppliers are also diverse.

Application scenarios

Control motors in the field of automation can be divided into servo motors, stepper motors, variable frequency motors, etc. For components that require more precise speed or position control, servo motor drive will be chosen.
The control method of frequency converter+variable frequency motor is to change the motor speed by changing the power frequency of the input motor. Generally only used for speed control of motors.

Compared to stepper motors:

a) Servo motors use closed-loop control, while stepper motors use open-loop control;
b) Servo motors use rotary encoders to measure accuracy, while stepper motors use step angles. The accuracy of the former can reach hundreds of times that of the latter at the ordinary product level;
c) The control method is similar (pulse or directional signal).

power supply

Servo motors can be divided into AC servo motors and DC servo motors based on their power supply.

The two are still relatively easy choices. For general automation equipment, Party A will provide standard 380V industrial power supply or 220V power supply. At this time, the corresponding servo motor of the power supply can be selected, eliminating the need for power type conversion. But there are some devices, such as shuttle boards and AGV cars in three-dimensional warehouses, which, due to their mobility, mostly use built-in DC power supply, so DC servo motors are generally used.

band-type brake

Based on the design of the action mechanism, consider whether there will be a tendency for the motor to reverse during power outages or stationary states. If there is a reversal trend, it is necessary to choose a servo motor with a brake.

At present, there are many brands of servo motors on the market, and their performance varies greatly. Generally speaking, if you don't need money, you should choose European and American ones, and Japanese ones, then Taiwan, China and Chinese Mainland ones. It's not that the author admires foreign things, it's a lesson learned from practical use. Based on past experience, the basic performance of domestically produced servo motors is not a problem, but there are certain gaps in the control algorithm, integration, and stability of the main servo controllers. I hope domestic manufacturers will continue to work hard to narrow the gap with foreign products.