Servo drive is a kind of controller used to control servo motor, its role is similar to the frequency converter acting on ordinary AC motor, is a part of the servo system, mainly used in high-precision positioning system. This article focuses on the role of servo drives and the difference between servo drives and frequency converters.
The role of servo drives
The servo motor controller is a key device in the field of numerical control system and other related mechanical control, which controls the servo motor through three ways of position, speed and torque to achieve high-precision transmission system positioning. It is part of the servo system and is mainly used in high-precision positioning systems.
Mainstream servo drives use digital signal processors as control cores, which can realize more complex control algorithms, realize digitalization and networking and intelligence. Power devices generally use the drive circuit designed with intelligent power module as the core, and the IPM integrates the drive circuit, and has fault detection protection circuits such as overvoltage, overcurrent, overtemperature and undervoltage.
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Servo drives are an important part of motion control and are widely used in automation equipment such as industrial robots and CNC machining centers. In particular, servo drives used to control AC permanent magnet synchronous motors have become a research hotspot at home and abroad. Vector-based current, speed, and position-3 closed-loop control algorithms are commonly used in servo drive designs.
Servo drive and frequency converter are different, servo drive and frequency converter are defined differently
Drive, also known as servo controller and servo amplifier, is a controller used to control servo motors, and its function is similar to that of frequency converters acting on ordinary AC motors. It belongs to the servo system, and is mainly used for high-precision positioning systems.
A frequency converter is a power control device that uses the switching function of a power semiconductor device to convert a power frequency power supply into another frequency. It realizes the functions of soft start, frequency conversion speed regulation, improving running accuracy and changing power factor of AC asynchronous motor.
The overload capacity of servo drives and frequency converters is different
In general, the drive has an overload capacity of 3 times, which can be used to overcome the moment of inertia of the inertial load when starting, while the frequency converter generally allows an overload of 1.5 times.
The servo drive and the frequency converter control accuracy is different
The control accuracy of the drive is much higher than that of the frequency converter. Usually the control accuracy of the drive motor is guaranteed by the rotary encoder at the rear end of the motor shaft, and some of the drive systems even control the accuracy up to 1:1000.
Servo drives and frequency converters are used differently
Frequency converters and drives are two types of control, the former belongs to the field of transmission control and the latter belongs to the field of motion control. The first is to meet the requirements of general industrial applications, the application performance requirements are low and the pursuit of low cost, and the other is to pursue high precision and high performance and high response.
Regarding the question of servo drives, this article focuses on the role of servo drives and the difference between servo drives and frequency converters. It can be seen that the role of servo drives is very large, and it is widely used in automation equipment such as industrial robots and CNC machining centers. In addition, to learn more about servo drives, you need to read more.