No, they are driven by ultrasonic/hypersonic vibration of a stator for true ring-type USM. Micro-motor USM uses an ultrasonic AC voltage to power a more conventional motor.
http://en.wikipedia.org/wiki/Ultrasonic_motor -Adam On Thu, Feb 4, 2010 at 6:27 PM, Larry Colen <l...@red4est.com> wrote: > Do the motors turn at 900,000 RPM (15,000 hz * 60)? > > -- > Larry Colen l...@red4est.com sent from i4est > > > > > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. > -- M. Adam Maas http://www.mawz.ca Explorations of the City Around Us. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
