Re: [ATM] Telescope direct drive

["Mel Bartels" <mbartels@bbastrodesigns.com>]

> Telescope direct drive may now be possible using a new kind of piezomotor.
> A piezomotor is made using PZT ceramic materials and can operate at
> frequencies of 130Khz with up to 130mm/sec linear velocities. No need for
> stepper motors, servo motors, worm gears, cable drives, roller drives, 
> band
> drives ,harmonic drives, or other types of gear reduction. A piezomotor 
> can
> directly move a circular disc, circular sector or produce direct linear
> motion.  Some commercial companies that produce PZT piezomotors are EDO
> corp., Mad City Labs Inc., Nanomotion Inc., Physik Instrumente L.P.


The issue with these motors has always been cost.  Last I checked the cost 
of a motor far exceeds a typical drive setup.

Also I wonder about the dynamic stability at low rates of motion.

Mel Bartels 

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