Tom Gardner wrote:

This dog won't stay petted!!! I have an application that unspools wire with
a dancer operated switch controlling a @35 RPM 1/15 HP ac gearmotor belt
driving a roller that a wooden spool fits on. I know I have to use "Shaded
Pole" or "Permanent Split Capacitor" motors as a cap start motor will
burn-up in a day due to the constant on/off switching. I have three of
these de-spoolers and need to make six more. These gearmotors are about
$250 ea and I have to replace at least two a year now. Any suggestions an a
better solution? Anybody got any gearmotors they want to sell? I keep an
eye on ebay and surplusscenter.


Consider using a DC motor. If you want to use a switch then the brute
force method is to use supply with some overhead and a great big
resistor to limit current to the motor. If you want to get fancy then
use a potentiometer on the dancer along with a PLC or other motion
controller (and get ready to learn about control theory, PID tuning, and
a bunch of other stuff, oh boy).

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Tim Wescott
Wescott Design Services
http://www.wescottdesign.com