A servo system, also known as a follow-up system, is a feedback control system used to accurately follow or reproduce a process. A servo system is an automatic control system that enables the output controlled variable, such as the position, orientation, and state of an object, to follow any change in the input target (or given value). Its main task is to amplify, transform, and regulate power according to control commands, making the torque, speed, and position control of the drive device highly flexible and convenient. In many cases, a servo system specifically refers to a feedback control system where the controlled variable (the system's output) is mechanical displacement or displacement velocity and acceleration. Its function is to ensure that the output mechanical displacement (or rotation angle) accurately tracks the input displacement (or rotation angle). Its structural composition is not fundamentally different from other forms of feedback control systems. Servo systems were initially used in defense and military industries, such as artillery control, ship and aircraft autopilot, and missile launches. Later, they were gradually extended to many sectors of the national economy, such as automatic machine tools and wireless tracking control.
What is a servo system?
A servo system, also known as a local feedback control system, is a feedback control system used to precisely follow or reproduce a process. A servo system is an automatic control system that enables the output controlled variables, such as the position, orientation, and state of an object, to follow any changes in the input target (or given value). Its main task is to amplify, transform, and regulate power according to the requirements of control commands, making the torque, speed, and position control of the drive device highly flexible and convenient. A servo system consists of three parts: a controller, a power drive device, and a motor.
What is a servo drive? A servo drive, also known as a servo controller or servo amplifier, is a controller used to control servo motors. Its function is similar to that of a frequency converter for a regular AC motor. It is part of a servo system and is mainly used in high-precision positioning systems. It typically controls the servo motor through position, speed, and torque to achieve high-precision positioning of the transmission system. Currently, it represents a high-end product in transmission technology.
Working Principle: Currently, most mainstream servo drives use digital signal processors (DSPs) as the control core, enabling the implementation of complex control algorithms and achieving digitalization, networking, and intelligence. Power devices generally employ drive circuits designed around intelligent power modules (IPMs). The IPM integrates the drive circuitry and also features fault detection and protection circuits for overvoltage, overcurrent, overheating, and undervoltage. A soft-start circuit is also added to the main circuit to reduce the impact on the driver during startup.
The power drive unit first rectifies the input three-phase power or mains power through a three-phase full-bridge rectifier circuit to obtain the corresponding DC power. The rectified three-phase power or mains power is then frequency-converted by a three-phase sinusoidal PWM voltage-source inverter to drive the three-phase permanent magnet synchronous AC servo motor. The entire process of the power drive unit can be simply described as an AC-DC-AC process. The main topology of the rectifier unit (AC-DC) is a three-phase full-bridge uncontrolled rectifier circuit.
Currently, Huashu Robotics offers three main categories of servo drive-related products: HSS-LDE modular servo drives, HSS-LDE integrated servo drives, and HSI-A series integrated drive and control systems.
The HSS-LDE modular servo drive adopts a combined design, where a single power module can be equipped with multiple drive modules according to actual requirements. The overall structure is compact and easy to install. The modular AC servo drive uses the internationally mainstream EtherCAT network communication protocol and features a high-resolution absolute encoder interface. It is suitable for the high-speed, high-precision, low-power, and networked requirements of industrial robots.
The HSS-LDE integrated servo drive is a six-axis drive integrated design with a very compact body size. It has multiple built-in feedforward functions, which greatly improves the positioning accuracy and dynamic characteristics of the robot.
The HSI-A series integrated motion controller is a new generation of innovative motion control products, featuring integration, intelligence, portability, interconnectivity, and low cost. It integrates traditional multi-axis servo drives, IPCs, and IO modules into one unit. Compared to traditional motion control cabinets, it offers higher reliability and simplifies customer application and wiring.
Servo drives are an important component of modern motion control and are widely used in automated equipment such as industrial robots and CNC machining centers. Servo drives for controlling AC permanent magnet synchronous motors, in particular, have become a research hotspot both domestically and internationally. Current AC servo drive designs commonly employ a three-loop control algorithm based on vector control, encompassing current, speed, and position. The rationality of the speed closed-loop design within this algorithm plays a crucial role in the overall performance of the servo control system, especially in terms of speed control performance.
Servo is short for ServoMechanism, derived from the Greek word meaning "slave." As the name suggests, it refers to a system that follows external commands to perform desired movements, including physical quantities such as position, velocity, and torque. Looking back at the development of servo systems, from the earliest hydraulic and pneumatic systems to today's electrified systems, servo systems composed of servo motors, feedback devices, and controllers have been around for nearly 50 years. Today, with the continuous maturation of technology, AC servo motor technology, with its excellent cost-effectiveness, is gradually replacing DC motors as the dominant actuator in servo systems. The maturity of AC servo system technology has also led to rapid and diversified market development, becoming one of the supporting technologies for industrial automation. The continuous upgrading of my country's manufacturing industry has provided a huge market for the development of my country's servo industry. In recent years, with the continued good development of industries such as CNC machine tools, packaging machinery, and electronic special equipment, and the increasing maturity of AC servo technology, the application of servo technology in emerging industries such as the wind power industry in the new energy sector has led to the rapid development of my country's servo market. In 2010, my country's servo market grew by 39.7% year-on-year, reaching a market size of 3.99 billion yuan. Many forward-thinking domestic manufacturers are increasing their R&D efforts to improve product performance and expand their brand appeal. It is expected that domestic servo manufacturers will soon break the import monopoly. Based on this, it is predicted that over the next five years, my country's servo system industry will benefit from industrial upgrading and maintain a growth rate of over 20%. By 2015, the market size of my country's servo system industry is expected to exceed 10 billion yuan, with domestically produced servo products accounting for approximately 40% of the market share.
Motion control is ubiquitous in actual industrial settings, and we often hear people mention it; but what exactly is motion control, and what are its basic concepts? Below, we will provide a brief introduction.
Motion control (MC) is a branch of automation that uses devices commonly known as servo mechanisms, such as hydraulic pumps, linear actuators, or motors, to control the position or speed of machines. The application of motion control in robotics and CNC machine tools is more complex than in specialized machines, where the motion is simpler and is often referred to as general-purpose motion control (GMC). Motion control is widely used in the packaging, printing, textile, and assembly industries.
The basic concept of positioning: to move a specified object to a specified position at a specified speed and trajectory.
Motion control requires a controller (PLC), drivers, motors, and other mechanical components. The mechanical components need to provide position and speed feedback to the controller, forming a closed-loop control system. This allows the controller to know the dynamic and position information of the mechanical components.
Feedback of the motor's speed and position to the driver is also a form of closed-loop control, forming a closed loop between the motor and the driver; alternatively, the motor can feed back its position and speed to the controller, creating a closed loop.
Position and velocity are key elements in motion control.
a represents acceleration, d represents deceleration, and s represents the distance traveled (position).
The concept and composition of a servo system
What is a servo system? It is an automatic control system that uses the position, orientation, and state of an object as control variables to track arbitrary changes in the input target value (or given value).
Composition of a servo system: A servo system is an automatic control system with feedback closed loop, consisting of a controller, servo driver, servo motor, and feedback device.
A servo is essentially an automatic control system whose output variable constantly changes in response to a given value. For those of us already familiar with servo cables and servo motors, understanding servo motor cables requires grasping the crucial concepts of servo and servo system.
As an automatic control system, a servo outputs control quantities including the position, orientation, and state of an object. Generally, its task is simply to amplify, transform, or adjust power according to requirements, thereby enabling more flexible control of the output of the drive device. The word "servo" actually means "slave" in Greek, indicating that servo mechanisms were originally created as tools to meet people's needs, all aimed at making their work more efficient. Therefore, servo mechanisms always perform related actions according to the requirements of the control signal. Once the control signal is lost, it will remain stationary until the control signal is transmitted again. Later, based on the characteristics of servo mechanisms, the concept of a "servo system" was derived.
A servo system, also known as a follow-up system, is a feedback control system used to precisely follow or reproduce a process. The controlled variable in a servo system, i.e., the system's output, generally refers specifically to mechanical displacement, acceleration, or velocity; it's a feedback system designed for these. Its function is to ensure that the output angle or mechanical displacement effectively and accurately tracks the input angle or mechanical displacement. Structurally, a servo system is not fundamentally different from other types of feedback control systems. Furthermore, the function of a servo system is quite clear: primarily used to control high-power loads with low-power signals, to control remote output axes from input axes without mechanical connection, and to ensure that the output mechanical displacement accurately tracks electrical signals; for example, indicating instruments function this way.
Now that you know what a servo is, and the concept and working principle of a servo system, if you still have questions and want to learn more about servo motor cables, you can visit the official website of Shanghai Kelan Electric Co., Ltd. for information consultation. Kelan is confident it can answer your questions and is dedicated to serving you. A servo is essentially an automatic control system whose output controlled variable constantly changes with the given value. For those of us who already understand servo cables and servo motors, understanding servo motor cables requires understanding the two most crucial concepts: servo and servo system.
As an automatic control system, a servo outputs control quantities including the position, orientation, and state of an object. Generally, its task is simply to amplify, transform, or adjust power according to requirements, thereby enabling more flexible control of the output of the drive device. The word "servo" actually means "slave" in Greek, indicating that servo mechanisms were originally created as tools to meet people's needs, all aimed at making their work more efficient. Therefore, servo mechanisms always perform related actions according to the requirements of the control signal. Once the control signal is lost, it will remain stationary until the control signal is transmitted again. Later, based on the characteristics of servo mechanisms, the concept of a "servo system" was derived.
A servo system, also known as a follow-up system, is a feedback control system used to precisely follow or reproduce a process. The controlled variable in a servo system, i.e., the system's output, generally refers specifically to mechanical displacement, acceleration, or velocity; it's a feedback system designed for these. Its function is to ensure that the output angle or mechanical displacement effectively and accurately tracks the input angle or mechanical displacement. Structurally, a servo system is not fundamentally different from other types of feedback control systems. Furthermore, the function of a servo system is quite clear: primarily used to control high-power loads with low-power signals, to control remote output axes from input axes without mechanical connection, and to ensure that the output mechanical displacement accurately tracks electrical signals; for example, indicating instruments function this way.
