Robot Collision Detection is a safety and monitoring function that enables a robot to recognize when its body, tool, or payload comes into contact with an unexpected object. Collision detection is particularly important in industrial environments where robots work near machines, products, operators, and other robots. The system continuously monitors parameters such as motor current, torque, position, speed, and acceleration to identify abnormal changes.
One common method is to compare the robot’s actual motor torque or current with the expected value for a particular movement. During normal operation, the required torque remains within a predictable range. If the robot suddenly encounters an obstacle, the motor may require significantly more torque. The controller can recognize this abnormal condition and generate a collision warning or fault signal.
Modern robots may also use force-torque sensors, joint torque sensors, proximity sensors, cameras, LiDAR, and ultrasonic sensors for collision detection. These sensors provide additional information about objects around the robot. For example, a vision system can identify a person or object entering the robot’s working area, while a force sensor can detect unexpected physical contact during manipulation.
When a possible collision is detected, the robot controller can take an appropriate protective action. Depending on the application and safety design, the robot may reduce its speed, stop its movement, hold its position, or enter a safe state. Some systems can also record the collision location, motor current, torque, and sensor information for later diagnosis.
Robot Collision Detection improves operator safety, equipment protection, product quality, and system reliability. It can also reduce damage caused by unexpected impacts and help maintenance engineers identify mechanical or programming problems. In advanced robotic systems, collision detection can work together with obstacle avoidance, safety monitoring, and predictive maintenance to create a more responsive and intelligent robotic environment.