27 Aug '16, 9am

Rise of the #Cobots Inspires Safety #Innovation

Although a soft shell may mitigate any injury, force sensing is needed to activate emergency stop and will be a critical aspect of the collaborative robot’s safety control systems. This may be implemented in various ways, such as detecting excessive motor torque by sensing rotor position and current. If the motor encounters an obstruction, the current will increase above a predetermined threshold causing the system to turn the motor off. This approach requires minimal additional components, since rotor-position sensors and current-sensing resistors are usually a part of the motor-control system. On the other hand, software or logic may be needed to enable the system to distinguish between normal changes in motor torque when handling normal loads and an increase in torque due to obstruction by a human co-worker.

Full article: http://www.digikey.com/en/articles/techzone/2016/aug/rise...

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