How to control the variable speed of a variable speed drill?
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How to control the variable speed of a variable speed drill?
I can do on/off and probably forward/reverse.
The drill is 110 volts AC and 3.0 amps.
Is it the voltage or amperage that controls the speed?
Thanks,
Frank
I can do on/off and probably forward/reverse.
The drill is 110 volts AC and 3.0 amps.
Is it the voltage or amperage that controls the speed?
Thanks,
Frank
Comments
Since your motor has brushes, it's really as an AC/DC motor and voltage
dependant, which can be speed controlled via a phase-fired triac (light
dimmer). You should be able to control it via a BS10 module, or you can
build your own by making a ramp-firing circuit that looks for the beginning
rise of the 60 Hz 120 Volt line, then starts charging a capacitor. You can
set up a comparator to wait until the cap charge gets to some point that you
set via the D/A output of the stamp. The earlier you fire in the AC
waveform, the more time the Triac is on, the faster the drill spins, or
light bulb lights. Triacs then unlatch themselves when the live voltage
crosses zero and wait for the next trigger.
BTW: phase fired triacs won't work vary well on pure AC motors, like
capacitor run or start units, since they're really synchronous and want to
lock to the 60 Hz frequency. If you use a triac on them, you won't reduce
the speed, just the torque. Yes, the fan will slow down, but it's
unpredictable how much, etc.
Mike Sokol
www.modernrecording.com
mikes@m...
" One should not increase, beyond what is necessary,
the number of entities required to explain anything"...
-William of Occam-
Original Message
From: "franksmith512" <franksmith512@y...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, December 18, 2003 4:49 PM
Subject: [noparse][[/noparse]basicstamps] How to control the variable speed of a variable speed
drill?
> How to control the variable speed of a variable speed drill?
>
> I can do on/off and probably forward/reverse.
>
> The drill is 110 volts AC and 3.0 amps.
>
> Is it the voltage or amperage that controls the speed?
>
> Thanks,
> Frank
>
>
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