“As the opening year of the 14th five year plan, 2021 is a good start for the robot industry. According to the data of China Commercial Industry Research Institute, the overall output of industrial robots in China has shown an increasing trend in recent years, reaching the highest value in recent five years in 2021. The market sales volume is 248000 units, an increase of 46.1% year-on-year. More data show that China has become the world’s largest consumer of industrial robots for eight consecutive years. “

Industrial robot industry is an important symbol to measure the level of a country’s scientific and technological innovation and high-end manufacturing industry, and it is also a key carrier to realize intelligent manufacturing. The core part of the robot is the servo driver for motion control. The movement of each axis must be synchronized and consistent with all other axes in time, so that the robot arm can walk through the predefined path in a certain time and space. Traditionally, a large external control cabinet is required, which contains all servo joints and power electronic equipment. The disadvantage of this architecture is that the cabinet size must match the size of the robot it controls, and it is difficult to add new components, which greatly reduces the scalability and flexibility of the robot.

Flexibility is essential for manufacturers to change the size of production lines or batches. In order to respond to changing consumer needs, more and more common robot architectures pay more attention to the integration with servo drivers, which is also closely related to the trend of smaller size and lighter weight of robots in the market. This new architecture supports the addition of axes and sensors, connects everything to the robot’s communication network and DC power supply, and all power electronic devices and controls are inside each integrated drive of each axis. This architecture not only brings great flexibility, but also the design of integrated drives can save space and improve efficiency.

Traditional framework vs. new framework

In the whole robot system, position detection is used to perform direct position control, or infer speed and perform machine speed control. The encoder is the most widely used position detection in the robot arm. The encoder has dual encoder architecture and single encoder architecture. Most of them adopt dual encoder architecture. However, according to the system, magnetic encoder will be used in some application scenarios. Magnetic braiding is a technology based on anisotropic magnetoresistance (AMR), which is characterized by small size, simplicity and low cost. According to the demands of different technology trends, the following is a look at how to meet the product needs of different end users with the corresponding products of Adeno semiconductor (ADI), a representative technology provider in the industry.

Based on the AMR position sensor solution, magnetic sensing provides reliable and accurate position detection for encoder applications. Compared with optical encoders, magnetic sensing provides a lower cost solution and a more reliable solution in industrial environments susceptible to dust and vibration. Both ada4570 and ada4571 of ADI are AMR sensors, integrated signal conditioning amplifiers and analog-to-digital converter (ADC) drivers, which can generate two analog outputs to indicate the angular position of the surrounding magnetic field. They are encoder products used by Adi as standard industrial products. This series of products consists of two bare chips in one package, namely, an AMR sensor and a fixed gain instrument amplifier. Compared with ada4571, ada4570 is a differential gain signal output with direct signal conditioning and driving. In terms of the whole product design, the ada4570 can be directly connected to the ADC without additional operational amplifier. In addition, directly adding some simple non isolated RS-485 communication interfaces to the LDO power supply of ada4570 can form a very standard encoder hardware circuit.

Ada4570 and ada4571 integrate AMR angle sensor and integrated signal regulator to provide higher precision absolute position detection (error <0.1 °, service life >0.1 °, service life ><0.5 °) for motor driver and server applications. They can operate reliably in harsh magnetic environments, support wide air gap tolerances and do not reduce angular error accuracy (with Hall >0.5 °). They operate reliably in harsh magnetic environments, support wide air gap tolerances and do not reduce angular error accuracy (compared with Hall >

At present, a new round of scientific and technological revolution and industrial transformation are accelerating, a new generation of information technology and robot technology are deeply integrated, and the robot industry has ushered in a window period of upgrading and leapfrog development. Driven by both technology and policy, China’s robot industry is accelerating the expansion of application scenarios in the fields of industrial production, life services and special operations. Industrial robots need progress in most areas, including motion information created by advanced detection solutions. Motion control has evolved over time, from a simple grid connected motor to a complex multi axis servo drive solution for machine tools and industrial robots. In order to achieve a higher level of productivity, flexibility and automation in intelligent manufacturing, the automation technology is becoming more and more complex. The compact magnetic sensing detection technology provided by Adi can achieve powerful and accurate position detection. Compared with traditional technologies, AMR position measurement has many advantages, such as accurate position detection in harsh industrial environments (such as dusty environments), So as to provide a high performance solution for robot system design.

Reviewed by: Li Qian

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