This clutch device enables low-power, rapid, and reversible actuation of soft robotic devices to improve physical human-robot interactions
Background Common implementations of soft robotics and compliant mechanisms utilize deformable materials, such as silicone or other elastomers, in their designs. Flexibility and elasticity improve overall compliance, but constructing robots from these materials often limits the overall strength and speed of a robot. This smart material clutch enables several control strategies, improving physical human robot interactions through variable stiffness joints in actuated linkages, variable grip strength, and conformal grasping.
Technology Description This technology is a compact, low-power and partially 3D-printed magnetorheological fluid clutch that operates by variably and reversibly altering the shear stress of the fluid through the local activation of an array of electropermanent magnets (EPMs). By toggling the magnetization of each EPM independently on the order of a few milliseconds, we allow for rapid response times and variable torque transmission without further power input. Selectively polarizing the EPMs for different lengths of time results in repeatable and variable magnetic flux, in turn enabling further control precision. We present the design, modeling, and measured performance of this clutch with various control strategies and demonstrate its utility as a low-power alternative to more traditional clutch designs.
Features & Benefits
Applications
Status Patent pending