Wide Speed Range
Wide Speed Range
(OP)
What's the best choice for a motor with a wide speed range requirement? This application will spend 99% of it's operating life at low speed and 1% at 130x. Other desired features are feedback, high reliability, long life, and low cost in high volumes (> 10k/yr).
Thanks!
Thanks!





RE: Wide Speed Range
RE: Wide Speed Range
RE: Wide Speed Range
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Please read FAQ240-1032
My WEB: <http://geocities.com/nbucska/>
RE: Wide Speed Range
RE: Wide Speed Range
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Wide Speed Range
blaksea, itsmoked:
I'm not familiar with how to specify a smoothness parameter - but you're right, itsmoked - it is exactly the speed of a clock - it is a solar tracking application.
Thanks all, for your comments!
RE: Wide Speed Range
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Wide Speed Range
To all:
What is the best way to protect the stepper motor/gear from
the environmental effects?
What about immersing the whole thing in oil?
----------------------------
Please read FAQ240-1032
My WEB: <http://geocities.com/nbucska/>
RE: Wide Speed Range
RE: Wide Speed Range
I suggest the slow motor driving a high ratio gear reducer. The high speed motor or the output of the gear reducer to drive the final reduction gearbox depending on which clutch is energised.
If this is a high torque application, consider air operated clutches.
respectfully
RE: Wide Speed Range
You need to be able to move this whole thing a 100 times faster for installation, setup, and repairs. If you are stuck at sidereal rates you will be... um in a hard spot. That is the whole hassle of designing telescope drives. How to get it to slew at a reasonable rate while tracking at a slow enough rate to allow solid photography.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Wide Speed Range
RE: Wide Speed Range
nbucska - one per installation if a polar drive (the seasonal drive only moves 1/8 degree per day, possibly with a linear actuator - or two for an az-el drive. But the az-el drives have an even wider speed range requirement, going to theoretical infinite at azimuth. I like immersion, but probably need to find it off the shelf...
sreid - yes, it's a thermal application, so slewing too slow, as Keith points out, is fatal.
waross - hard to imagine clutches achieving reliability or cost targets?
Clyde38 - (nice handle!) - looking into switched reluctance - thanks.
RE: Wide Speed Range
mirrors individually servoed but they abandonned it --
I don't know why.
I wonder if it wouldn't be cheaper to use one -- or a few -- mobile "tuning" unit which on a rail could go from
mirror to mirror and re-adjust them one at a time ?
This would reduce the part-count and maintenance.
----------------------------
Please read FAQ240-1032
My WEB: <http://geocities.com/nbucska/>
RE: Wide Speed Range
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com