B Watson et al 2009 J. Micromech. Microeng. 19 022001 doi:10.1088/0960-1317/19/2/022001
Piezoelectric ultrasonic resonant motor with stator diameter less than 250 µm: the Proteus motor
FREE ARTICLEB Watson, J Friend and L Yeo
Show affiliationsBRIEF COMMUNICATION
Minimally invasive and in vivo surgery is limited by the ability to provide controllable and powerful motion at scales appropriate for navigation within the human body. A motor for in vivo microbot propulsion is presented with a stator diameter of 
250 µm, demonstrating the potential to directly drive a flagellum for swimming at up to 1295 rpm with a torque of 13 nN m. The motor uses coupled axial-torsional vibration at 652–682 kHz in a helically cut structure excited by a thickness-polarized piezoelectric element. The output power is 4.25 µW, on the order of what is necessary to navigate small human arteries.
- PACS
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85.50.-n Dielectric, ferroelectric, and piezoelectric devices
- Subjects
- Dates
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Issue 2 (February 2009)
Received 25 September 2008, in final form 18 November 2008
Published 20 January 2009
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Piezoelectric ultrasonic resonant motor with stator diameter less than 250 µm: the Proteus motor
B Watson et al 2009 J. Micromech. Microeng. 19 022001
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