[SML] Variable speed motor

[Richard Niederberg]

Or you can just 'borrow' the winch in your gym built to pivot a basketball
hoop out of the way, or the winch used to pull a Pleasure Craft on to it's
trailer.
/s/ Richard
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On Wed, May 11, 2016 at 9:14 AM, Loren Schreiber via Stagecraft <
stagecraft at theatrical.net> wrote:

> AC motors have pretty much supplanted DC motors in most industries. The
> cost of AC inverters (drives) has come down to the point that AC is
> actually a much more economical way to go.
>
> In this case, it's not a simple matter of buying a variable speed motor.
> All commonly available motors (AC or DC) will need a gear box of some sort
> to drop the speed and increase the torque to something you can use. But
> that's not the end of it. If you are connecting a cable to this motor, then
> you will need a drum of some sort and the support structure (winch) to go
> with it. As others have mentioned, then there is electrical cabling ($$),
> controls, e-stop circuits, electrical enclosures etc., etc., etc. All this
> is fun stuff to design and build, but it sounds like you are on a tight
> schedule and a little behind the curve for developing your own system in
> house.
>
> Others have mentioned Creative Conners as a source for a turn-key system
> that you can buy off the shelf. I heartily concur. However, a glance at the
> prices (and Creative Conners is very affordable when compared to other
> available systems) and I think, in this case anyway, you might just want to
> pull a rope. I have designed and built automated scenery movers for decades
> now, but these days it's just easier, cheaper and faster to buy a system
> like Creative Conners.
>
> OK, that said, I know of a school that will rent a compact hand-cranked
> winch that would likely work in your situation. Most of your cost would be
> shipping to and from your theatre because winches are heavy. Let me know
> and I will put you in touch.
>
> Loren Schreiber, Professor Emeritus
> San Diego State University
>
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-- 
/s/ Richard
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