In the global market share of servo motors, Japanese brands account for 40% of the market, German brands occupy 30%, and domestic servo motor companies include Inovance Technology, INVT, Huazhong CNC, JMC, Leisai Intelligent and other enterprises. Less than 10%. There is no doubt that the late start of development, the immaturity of cutting-edge application technology, and the lack of core competitiveness of products make it difficult for domestic servo motors to win in international competition.

Wang Shen said to this: "We certainly cannot catch up with the gap in time, but in terms of key technologies, domestic servo motors can further narrow the gap."

There are several "holes" in domestic servos that need to be filled in recent years. Although domestic servo manufacturers have also made key breakthroughs in key technologies, at the current stage, domestic servo motors are still full of problems. Based on the national conditions of China's late start in the development of intelligent manufacturing, early robots generally used general-purpose servo motor products, including most of the servo motor products currently on the market are general-purpose.

"The servo motors used in robots are also different from those used in other equipment. Robots require high-speed, high-precision, and highly reliable servo motors. Currently, domestically produced servo motors can only meet the requirements of welding robots."

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Ge Huanqing, general manager of Shenzhen Fushi Industrial Technology Co., Ltd., commented bluntly: "No company's products can really be applied to industrial robots."

It is understood that many servo motors can be applied to very simple robots, but if the control function is more complicated, it cannot meet the requirements, and there are many differences in the technical level.

Generally speaking, a servo motor with high performance, high precision, high stability and other elements requires the cooperation between software and hardware. However, the domestic servo motor still lacks mature technology in the use of motor digital algorithms and highly reliable functional modules and components, resulting in poor production control and technical stability.

How many streets have we dumped abroad?

Talking about the current servo motors, many people in the industry said that there is still a big gap between domestic servo motors and foreign countries. So, how far is the gap between them? What steps have you made abroad?

Generally speaking, at present, the miniaturization of low-power servo motors in China is relatively lacking. For example, the 200W and 400W servo motors commonly used by light-load robots are generally long in China, but foreign ones such as Yaskawa and Panasonic have achieved short and small sizes. exquisite.

Xu Zhigen, vice president and CTO of Peitian Group, believes that such a gap is mainly reflected in the process and materials, such as the use of higher-grade permanent magnets, how to reduce the length of the end in the process, etc.; on the other hand, the size of domestically produced encoders It is also larger than that of foreign countries; there are similar gaps at home and abroad for brakes.

In terms of performance, there is a large gap between China and foreign countries in terms of dynamic response capability and overload capability.

The shorter the time for the servo motor to respond to the command signal during the process from obtaining the command signal to completing the command, the higher the sensitivity of the motor servo system and the better the quick response performance. In terms of overload capacity, since the robot will perform very frequent forward and reverse and acceleration and deceleration operations, the motor must be able to withstand harsh operating conditions and withstand several times of overload in a short period of time.

However, in these two aspects, there is a huge gap between domestic servo motors and the three major factions of Europe, Japan, and Taiwan.

At present, the mainstream Japanese brands are mainly Tamagawa, Yaskawa, Panasonic, Mitsubishi, and Sanyo, the European brands are mainly LAFERT and Kollmorgen, and Taiwan is represented by TECO. For the same motor (same power , inertia, same-level manufacturer, etc.).

"In terms of dynamic response capability and overload capacity, European motors are better, while Japanese and Taiwan motors are slightly weaker. Through testing various motors, we found that European motors generally have higher efficiency than Japanese motors. The efficiency of Japanese motors is about About 85%, the efficiency of European motors is about 95%, while the efficiency of domestic motors is very low.” said Dr. Zhang Minliang of STATE.

Where should the domestic servo go?

The technological breakthrough of the core parts of the servo motor is not only directly related to the improvement of the market competitiveness of domestic robot companies, but also has strategic significance for the development of the entire Chinese robot industry in the long run.

Under the circumstances of the huge disparity between domestic and foreign countries, in which direction should domestic servo motors develop in the future?

The way of integration is mainly reflected in the vertical integration of motor, feedback, control, drive, and communication into the current low-power servo system, that is, all components need to be closely integrated from design, manufacture, operation, and maintenance.

Intelligence is reflected in high speed, high precision and high performance. Then this requires servo manufacturers to adopt higher-precision encoders, higher sampling accuracy and data bits, faster DSP, high-performance rotating motors without cogging, linear motors, and application self-adaptation, artificial intelligence, etc. Various modern control strategies continuously improve the basic indicators (control speed, control accuracy) of the servo system.

Modularization not only refers to the combination of servo drive module, power supply module, regenerative braking module, and communication module, but also refers to the modularization and reusability of the internal software and hardware of the servo drive.

In terms of networking, it has become a common practice for European and American manufacturers to integrate fieldbus and industrial Ethernet technology, and even wireless network technology into servo drives. With the increasing domestic demand for large-scale distributed control devices and the successful development of high-end numerical control systems, the development of networked digital servos has become a top priority.