Domestic robots are still difficult to stand up: high-end servo motors are missing

Domestic robots are still difficult to stand up: high-end servo motors are missing

When everyone is talking about the lack of core technology of domestic robots and the need to strengthen the four core components, the most talked about are the reducer and the robot controller, and there are fewer talks about the servo motor in the servo system.

The current status of domestic servo motors is that small is not small, big is not big! How to understand this? Small power servo motors, small size is not good, generally long, such as 200W and 400W servo motors commonly used in light-load robots, currently Panasonic The A6 and Yaskawa's Σ7 motors are short and delicate.

In contrast, domestic servos are generally long and have a rough appearance. This is not possible in some high-end applications, especially on desktop robots with a light load of about 6 kg. Since the installation space of the robot arm is very small, the length of the servo motor is strictly required.

Secondly, the reliability of signal connectors has been criticized. Domestic servos need to be improved, and the miniaturization and high density of connectors are also a trend. The integration design with the servo motor body is a good practice. At present, many Japanese servo motors are designed in such a way as to facilitate installation, debugging and replacement.

Another core technology of servo motors is high-precision encoders, especially multi-turn absolute encoders used in robots, which rely heavily on imports. Failure to achieve localization is a major bottleneck restricting the development of China's high-end servo systems. The miniaturization of the encoder is also the core technology for the miniaturization of servo motors. Throughout the changes of Japanese servo motor products, it is accompanied by the coordinated development of motor magnetic circuit and encoder!

At present, domestic servo motor OEMs are mostly based on the market share of Japanese servo motors. The power is mostly within 3kw, and the power is mostly small and medium. However, the medium-to-high power servo of 5.5-15kw is not available, resulting in the application of some devices. Because there is no high-power servo motor and driver matching, it is forced to give up the whole system.

To sum up, the development model of Japanese servo system is layered and coordinated development, and the overall performance is excellent, which is very similar to the development of robots in Japan. In China, the motor is used as the motor, the encoder is used as the encoder, and the driver is driven. Without the synergy, the overall performance of the servo motor and the drive system is difficult to complete.

Secondly, the basic research on the lack of servo system, including absolute encoder technology, industrial manufacturing technology of high-end motors, breakthroughs in production processes, practical verification of performance indicators and formulation of assessment standards. These need to be perfected by the core component companies in the robotics industry.