Motor questions, rotary
Subject: Motor questions, rotary
From: richard.quick-at-slug-dot-org (Richard Quick)
Date: Thu, 17 Aug 1995 19:53:00 GMT
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Quoting Steve Roys:
SR> I just bought a 1/12 HP, 5000 RPM variable speed DC motor
SR> and I have a couple of questions. First, is this powerful
SR> enough to use to drive a rotary gap?
I purchased a 1/12 (or 1/10 depending on which spec sheet I read)
Bodine series wound DC motor. It did not work well. The speed was
there, but the motor just could not produce the required torque.
The rotor speed would drift, when I added a flywheel it took too
long to come up to speed.
I switched ober to a 1/2 HP 10000 RPM DC motor with much better
results. The motor basicly just idles at speed. The armature is
heavy enough it acts like a built in flywheel.
SR> Secondly, can I get DC to drive this motor by simply running
SR> the output from my variac through a full-wave bridge, or
SR> should I put in some filter caps to smooth out the ripples?
This depends on the component arraigments. If your run the rotor
directly off the motor shaft you can expect to lose a full-wave
bridge now and then. If you run the rotor on a separate shaft,
which is belt driven from a pulley on motor, then you won't have
SR> And a suggestion for Ed concerning your rotary gap: instead
SR> of adding more rotating electrodes to get higher break
SR> rates, it might be easier to add a second set of stationary
SR> electrodes positioned to fire halfway between the first set.
SR> This would effectively double your break rate and you
SR> wouldn't need to have a new disk machined.
Good point! I should have thought of this.
... If all else fails... Throw another megavolt across it!
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