Communication
Communication not only includes the communication itself, but also the processing of signals. A typical signal loop consists of the main computing unit inside a robot controller transferring position data over
industrial Ethernet to an axis control unit, which is controlling the motors inside the robot arm. A resolver senses the resulting position. The data is then sent back through a RS-485 interface to the main computing unit, which
counterchecks the position and sends further position-correction data to the axis control unit if needed. This scenario uses multiple communication protocols with different physical layers, thus requiring not only reliable but also flexible
processing units. A good example for processors supporting multiple industrial protocols are TI’s AM335x Sitara™ processors.On this processor family users can not only implement common industrial Ethernet protocols, but also implement their
proprietary protocol.
Motor Control
Motor control does not only mean how many robot axis or motors can be controlled at the same time, but also how efficient this can be done. Power management is always critical in a system. However, dealing with heat
caused by inefficient power supplies or field-effect transistors (FETs) with high switching losses becomes an even bigger problem in space-constrained areas. Examples include inverters placed in a robot control cabinet, or switches located
inside the robot arm itself, as is often the case for collaborative robots. To address this problem, TI offers not just controllers but also gallium nitride (GaN) modules, which have greatly reduced switching losses compared to regular
silicon-based FETs.
Sensing
In general, sensing is a very broad term. In the case of industrial robots, sensing refers to relatively simple devices like temperature or current sensors, up to complex systems like 3-D time-of-flight (ToF)
cameras. For collaborative robots, proximity sensing is critical to detect when people are around or to safely stop if or better before the robot arm bumps an unknown object. TI offers different devices supporting various advanced sensing
technologies for proximity sensing, like ultrasonic, fluxgate, radar or 3D-ToF.
To learn more about TI’s expertise in communication, motor control and sensing: