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For robots that act outside of tightly controlled environments, force control is often better suited than position control. Series clutch actuators, used without an elastic element, can achieve excellent position control or can be used as a force/torque source. Clutches based on different physical principles can be employed; while recently a lot of research has been performed on clutches based on...
Torque limiters are a proven way to enhance the safety in robots. To further increase the safety, adjustable torque limits depending on the task and the joint configuration (joint angles, velocity, acceleration) would be preferable. Friction clutches can be used as adjustable torque limiters (ATL). In contact free motion the ATL can be set with torque limits higher than the required torque, thereby...
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