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22 June 2000 Design and performance of a resonant roller wedge actuator
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A compact rotary motor driven by piezoelectric bimorph actuators was developed for applications in adaptive, conformable structures for flow control. Using a roller wedge (rotary roller clutch) as its central motion rectifying element, the actuator converts electrical power to mechanical power by way of a set of resonating bimorph/mass systems. With this type of resonant drive system, the output mechanical power of the actuator was dramatically improved over previous inchworm-type designs. Also, the actuator cost was kept low by using commercial roller clutches and bimorph actuators instead of PZT stacks. Within an application size constraint of 4 x 4 x 1.75 inches, the unloaded speed was 600 RPM, the stall torque was 0.5 N-m, and the peak output power was nearly 4 watts. The motor is driven by a single frequency sinusoidal input, resulting in significant improvements of the cost, size and complexity over typical piezoelectric actuator drivers. Since the backlash of the roller clutch is a critical parameter in assessing the motor performance, an experimental study was performed to better understand its dynamics.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jeremy Eli Frank, Gary H. Koopmann, Weicheng Chen, Eric Michael Mockensturm, and George Andre Lesieutre "Design and performance of a resonant roller wedge actuator", Proc. SPIE 3985, Smart Structures and Materials 2000: Smart Structures and Integrated Systems, (22 June 2000);

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