Study of a hollow ultrasonic rotary motor

Abstract

Abstract-In this study, a hollow cylinder ultrasonic motor has been designed in order to be integrated into mechatronic devices where the bore is either occupied for functional reasons or must remain free. The design approach consists in performing a FE modelling of the motor structure. After finding the different vibration modes, it is possible to find out the axial and tangential deformation amplitudes of the resonator allowing the motor rotation when a pre-stressing force is applied to the rotor. Using an optimisation methodology based on a sensitivity analysis using in particular the design of experiments method and then a FE optimisation, it is possible to maximize the deformation amplitudes in both directions to obtain higher torque and speed of the motor. Along with this process, functional models are built in order to validate the adopted design methodology and verify if the chosen motor concept is appropriate.

Simultaneous multi-spatial scanning optical coherence tomography (OCT) based on spectrum-slicing of a broadband source

“…Taye Mekonnen 1 , Agisilaos Kourmatzis 2 , Jason Amatoury 3 and Shaokoon Cheng 1 assembly which provides the high-resolution image. In the example of a biological lumen, a circumferential scan is achieved through a probe spinning procedure, using a torque coil or microelectromechanical (MEM) motors [9][10][11][12]. Currently, the reconstruction of full lumen geometries (such as respiratory airways and blood vessels) requires traversing the probe manually in the lumen to perform multiple circumferential scans at different lumen sites.…”

Resonant modes of tubular shells and their use in ultrasonic linear motors

“…A revision of piezoelectric motors using tubular structures shows that they are mainly employed in angular USMs [8], [9], [10], [11] [12] . An exception is presented by Xu [13], that build a motor using tubular piezoceramics with helicoidally patterned electrodes.…”