Guide: As a robot in the execution unit, the servo motor is the main factor affecting the performance of the robot. Servo motor is also one of the key shortcomings that China's robot industry needs to break through. The "Made in China 2025" plan has deployed the goal of robotic servo motors: by 2020, the performance, accuracy and reliability have reached the level of similar foreign products. As the actuator in the control system, the servo motor is one of the three core components of the robot. The robot servo system consists of three parts: servo motor, servo drive and command mechanism. The servo motor is the actuator, which relies on it to realize the motion. The servo drive is the power supply of the servo motor. The command mechanism is used to pulse or give speed. Works with the servo drive. In 2015, the market size of servo systems for robots in China was about 1.06 billion yuan. By 2020, the market size will reach 4.7 billion yuan, and the compound growth rate will be about 35% in the next five years. The servo system manufacturers at home and abroad regard the robot market as the key development direction in the future. The servo motor is generally installed at the "joint" of the robot. The joint drive of the robot is inseparable from the servo system. The more joints, the higher the flexibility and precision of the robot. The more servo motors you want to use. The demand for robots is expanding globally, and China is now the fastest growing robot market in the world. From 2013 to 2016, China has become the world's largest consumer market for industrial robots for three consecutive years. IDC predicts that by 2020, the Chinese robot market will reach 59.4 billion US dollars, and the Chinese market will account for more than 30% of the global robot market. The market space is huge. The rapid growth of robots will drive the huge demand for servo motors. Servo motors are often connected to the terminal actuators in an automated control system and are therefore also implemented as motors. The servo motor acts as an actuator in the servo system, and its function is to convert the pulse signal of the servo controller into the angular displacement and angular velocity of the motor rotation. Servo motors are divided into two major categories: DC and AC servo motors. Compared with ordinary motors, the main features are that they are usually used together with feedback devices to achieve precise control. Servo motor classification: In order to increase the flexibility of industrial production, robots are becoming lighter and lighter, and high-density servo motors are essential to ensure the dynamics and precision of robots. In the field of finishing operations, robots even need the flexibility of human hands. The motor is required to achieve high performance in the "can" size, improve production quality and efficiency, and ensure operator safety; in the field of medical robots, in order to allow the robot to help patients recover health as soon as possible, the motor stability and reliability are highly demanded. The high requirements of robots for servo motors are as follows: 1. The servo motor is required to have fast response. The motor should be short from the time it takes to obtain the command signal to the operating state required to complete the command. The shorter the response time of the command signal, the higher the sensitivity of the electric servo system and the better the fast response performance. Generally, the performance of the servo motor is reflected by the electromechanical time constant of the servo motor. 2. The starting torque of the servo motor is larger than the inertia ratio. In the case of driving the load, the starting torque of the servo motor of the robot is required to be large, and the moment of inertia is small. 3. The servo motor should have the continuity and linearity of the control characteristics. As the control signal changes, the speed of the motor can continuously change. Sometimes the speed is proportional to or proportional to the control signal. 4. In order to match the shape of the robot, the servo motor must be small in size, small in mass, and short in axial dimension. 5. Can withstand harsh operating conditions, can perform very frequent forward and reverse and acceleration and deceleration, and can withstand multiple overloads in a short time. AC servo drives are widely used in industrial robots because of their advantages of high torque moment of inertia ratio, no brush and commutating sparks.
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