Servo motor is an important breakthrough in the de

Servo motor is an important breakthrough in the development of domestic robots

since Germany proposed industrial 4.0, China has also proposed the "made in China 2025" plan. With the acceleration of China's automation pace, China will become a super robot country in the future, and the demand for industrial robots will increase greatly. However, stimulated by the high growth of industrial robots, the development path of servo motors, the main products of its control system and automation, is bound to change. Servo motors are the power system of industrial robots and the "heart" of robot motion. To develop domestic robots, the manufacturing and upgrading of domestic servo motors has become a key breakthrough

according to the global industrial robot servo motor industry report, China has become the world's largest industrial robot market since 2013, and its sales soared to 55% of the global servo motor sales in 2014. It is estimated that by 2019, the demand for servo motors in the Chinese market will reach 182000

at present, in China's industrial machine market, 85% of servo motors are foreign brands, while most local enterprises are still in the development and experimental stage, and there are almost no industrial robot servo motors

coexistence relationship between industrial robots and servo motors

servo motors are generally installed at the "joints" of robots. The joint drive of robots cannot be separated from servo systems. The more joints, the higher the flexibility and accuracy of robots, the more servo motors to be used

robots have very strict requirements for joint drive motors, so they also have strict requirements for electric servo drive systems, mainly in the following aspects:

1. Fast response. The higher the sensitivity of the electric servo system, the better the fast response performance

2. The inertia ratio of starting torque is large. In the case of driving load, the starting torque and inertia of the robot's servo motor are required to be large and small

3. The continuity and linearity of the control characteristics. With the change of the control signal, the speed of the motor can change continuously. Sometimes, the speed needs to be proportional or approximately proportional to the control signal. The speed regulation range is wide, and the speed regulation range of 1:1000-10000 can be used

4, small size, small mass and short axial size to match the shape of the robot

5. It can withstand harsh operating conditions and can carry out very frequent forward and reverse operations, acceleration and deceleration

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in addition, due to the domestic servo motor to be upgraded, the development of domestic robots is difficult. The current situation of domestic servo motors is that small ones are not small, and large ones are not big! How to understand this? The small power servo chlorinated polyethylene waterproof membrane gb12953 ⑵ 003 motor is not miniaturized, and it is generally too long. For example, the 200W and 400W servo motors commonly used by light-duty robots, the TBL Imini series servo micro motors of tamakawa, the A6 of Panasonic, and the A6 of Yaskawa Σ 7. The motor is short and exquisite

in contrast, domestic servos are generally long and rough in appearance. This is not good in some high-end applications, especially on desktop robots with a light load of about 6kg. Because the installation space of the robot arm is very narrow, there are strict requirements on the length of the servo motor

secondly, the reliability of signal connectors has been criticized. Domestic servo needs to continue to be improved, and the miniaturization and high density of connectors are also trends. The integrated design with the servo motor body is a good practice. At present, many Japanese servo motors are designed in this way, which is convenient for installation, debugging and replacement

another core technology of servo motor is high-precision encoder, especially the multi turn absolute value encoder used in robot, which is heavily dependent on imports. The lack of localization is a big bottleneck restricting the development of high-end servo systems in China. The miniaturization of encoder is also the core technology of servo motor miniaturization. Throughout the changes of Japanese servo motor products, it is accompanied by the coordinated development and upgrading of motor magnetic circuit and encoder

at present, according to the market share, most domestic servo motor OEM manufacturers imitate the Japanese servo motor design, and the power is mostly within 3KW, mostly small and medium-sized power. And 5 KW medium and high-power servo is not available, which leads to the application of some equipment. Because there is no high-power servo motor and drive, the whole system is forced to give up

to sum up, the development mode of Japanese servo system is hierarchical collaborative development, with excellent overall performance, which is very similar to the development of robots in Japan. In China, it is the motor that makes the motor, the encoder that makes the encoder, and the driver that makes the drive. There is no synergy, which makes it difficult to do a good job in the overall performance of the servo motor and the drive system

the second is the lack of basic research on servo system, including absolute value encoder technology, industrialized manufacturing technology of high-end motors, breakthroughs in production technology, practical verification of performance indicators and formulation of assessment standards. These need to be improved by the core parts enterprises in the robot industry