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Servo motor

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Servo motor


Servo motor refers to the engine that controls the operation of mechanical components in the servo system, and is an auxiliary motor indirect speed change device. The servo motor can control the speed, the position accuracy is very accurate, and the voltage signal can be converted into torque and speed to drive the control object. The rotor speed of the servo motor is controlled by the input signal and can respond quickly. In the automatic control system, it is used as an executive element, and has the characteristics of small electronic mechanical time constant and high linearity, which can convert the received electrical signal into the motor shaft. angular displacement or angular velocity output. It is divided into two categories: DC and AC servo motors. Its main feature is that when the signal voltage is zero, there is no rotation phenomenon, and the speed decreases uniformly with the increase of torque.


The biggest difference between a servo motor and an ordinary motor is the motor rotor and feedback device. The rotor surface of the servo motor is affixed with a strong magnetic steel sheet, so the position of the rotor can be precisely controlled by the magnetic field generated by the stator coil, and the acceleration and deceleration characteristics are much higher than those of ordinary motors. The feedback device can accurately feedback the rotor position of the motor to the servo driver. The commonly used feedback devices for servo motors include optical encoders, resolvers, etc. Therefore, servo motors are mostly used in spark machines, manipulators, precision machines, etc.


Industrial robots are the key supporting equipment for advanced manufacturing and can be widely used in various manufacturing environments. As the core component of robot equipment, the importance of servo motor is self-evident. In order to meet the requirements of mechanical equipment for high precision and fast response, servo motors are increasingly used in industrial production. In the process of designing and selecting a servo motor, if a large-sized motor is selected blindly, it will not only increase the cost, but also cause the design equipment to be too large and cause problems such as incompact structure. Therefore, all aspects of the requirements should be comprehensively considered when selecting the motor to give full play to the working performance of the servo motor. According to the rated torque, rotor load inertia, and motor speed calculated by the relevant formulas, a reasonable motor model can be determined, and then the selected model is substituted into the whole for all verification. For example, in the selection of the rated speed of the servo motor, in order to shorten the response time of the motor start-up, the motor will start to accelerate from a suitable speed when it starts from a static state. This speed is often referred to as the motor self-starting speed. The size of the motor and the working load are determined, generally 100~300r/min; and in the selection of the load inertia, it is generally necessary to consider that the selection of the servo system should first meet the rapid feed of the machine tool, and the servo motor is required to be able to quickly change according to the command. For a positioning movement, it is required to reach the target position in the shortest time. The basic function of the servo motor is to quickly convert the input electrical power into mechanical power output. The faster the power conversion, the better the speed of the servo motor. According to this, the selected servo motor works well on the equipment, and achieves the motion characteristics and positioning accuracy required by the equipment.


In the domestic servo motor market, Japanese and European and American brands occupy more than 70% of the market share, and the high-end market is monopolized by European and American international brands such as Siemens, Bosch, Kollmorgen and Schneider, and the domestic industrial foundation is still relatively weak. However, China hopes to encourage enterprises to increase the research and development and production of servo motors and gradually enter the advanced The high-end market for manufacturing.


Specifically, in terms of the market environment, relevant experts suggest to formulate specifications for the servo motor industry, promote the optimal allocation of various resources, encourage the development of the servo motor industry to high-end, prevent low-level repetitive construction, and improve the construction of the intellectual property protection system for servo motors. In terms of talent team building, experts suggest organizing and implementing the servo motor industry talent training plan, accelerating the cultivation of high-level technical R&D, management, production, maintenance and other talents urgently needed by the servo motor industry, and encouraging high-end talents at home and abroad to innovate and start businesses. Therefore, the development momentum of domestic servo motors is relatively good, and there are also a number of manufacturing enterprises focusing on dry motors and drive control systems, and have core technologies in the field of motors and drive control systems. Thanks to years of continuous investment in research and development, some companies have successfully overcome the core technical difficulties of the servo system, and the product performance is superior, and gradually entered the high-end servo motor market.


Relevant experts also suggested to promote the application of Intelligent Manufacturing in the motor industry. From traditional manufacturing to intelligent manufacturing is the inevitable trend of the development of motor manufacturing industry. Promoting intelligent manufacturing can not only achieve high quality and high efficiency of motor production, but also create a multi specification, small batch and flexible production mode, so as to better meet the needs of customers and the market. In order to truly become a big manufacturing country, China should increase policy support, speed up the formation of standards in industrial industries, and deepen the research of basic technology and materials in scientific research institutes; Enterprises should speed up technological breakthroughs and overcome difficulties, strengthen learning and innovation, enhance joint efforts of various parties, and jointly open up a path of sustainable development.Let the development of China's electric machinery enter a new stage.


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