The demand for motor control of the robot arm has increased greatly.

The robotic arm has begun to play an important role in the production line of the smart factory, which can replace the manual welding, painting and assembly processes to achieve more economical, fast and accurate standard work; and with the increasing attention of the robotic arm The microcontroller (MCU), which plays a heavy role in the control of the robot motor, is also expected to benefit.

Yang Zhenglian, product marketing manager of STMicroelectronics Greater China and South Asia, said that the application prospects of industrial robots are promising, so MCUs that play an important role in robot motor control will benefit significantly.

Yang Zhenglian, product marketing manager of STMicroelectronics and South Asia, said that because the factory line has a single robot or robot arm, it usually involves multiple operating mechanisms, but each has its own functions but also needs to coordinate with each other. The controller or processor built into the robot is responsible for the rapid growth of this wave of industrial automation.

Yang Zhenglian further pointed out that in a variety of controllers or processors, the market prospects of MCUs are the most promising. He explained that although the processing performance of the MCU is inferior to that of a microprocessor (MPU), a digital signal processor (DSP) or a field programmable gate array (FPGA), the robots on the smart factory line are currently Robot-based, high-precision, large-scale and fully-realistic robots are not yet common, and the robotic arm focuses on motor control performance, so MCUs that already have a place in the motor control field will benefit most directly.

It is understood that the degree of freedom of the robot system (DOE) depends on the number of moving joints. The more joints, the higher the degree of freedom, the better the displacement accuracy, but the number of motors that must be used is relatively high. In other words, the more sophisticated industrial robots, the greater the number of built-in motors, the greater the number of controllers or processors.

Therefore, Yang Zhenglian said that the market demand for industrial robots is getting stronger, and the business opportunities for MCU operators are also larger. Taking a single robot arm as an example, the built-in controllers on average have about eight MCUs, and the rest are MPUs, etc. High performance processor.

In order to meet the robot motor control application, in addition to the easy-to-develop embedded platform, design tools and general-purpose soft-software, the MCU industry must establish a perfect communication environment around the MCU, that is, the MCU must be able to handle various industrial communication protocols, including Control basic network bus (CAN BUS), universal serial bus (USB), serial peripheral interface bus (SPI), Ethernet, wireless local area network (Wi-Fi), Bluetooth (Bluetooth) and other basic communications .

On the other hand, MCU computing performance must also keep pace with the times. Yang Zhenglian pointed out that the average performance of MCUs is currently between 80 and 100 DMIPS, while that of high-end MCUs is 200 DMIPS. In order to improve the control efficiency and accuracy of industrial robots, the primary development goal of future MCU operators is to improve performance. Upgrade to 300-400 DMIPS while continuously optimizing the performance of peripheral components, such as the analog digital converter (ADC) from the mainstream 12-bit gradually replaced by 16-bit; in addition, we must also strive to improve the IP of the surrounding development environment support.

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