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From: Kevin McMurtrie
Newsgroups: sci.electronics.design
Subject: Re: Triac Hack?
References:
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Date: Mon, 23 Sep 2002 03:36:58 GMT
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In article ,
EskWIRED@panix.SPAMBLOCK.com wrote:
>[ This is a repost of the following article: ]
>[ From: EskWIRED@panix.SPAMBLOCK.com ]
>[ Subject: Triac Hack? ]
>[ Newsgroups: sci.electronics.basics ]
>[ Message-ID: ]
>
>I use a standard 600 watt dimmer switch in an unconventional way - to
>control the speed of a fan motor in a hot air popcorn popper which I use
>to roast coffee. It works well.
>
>However, if I turn it down only about a quarter turn, the motor gets
>insufficient current, and it stops. This is bad for a number of reasons,
>including safety reasons. I'd like to either replace the pot with one
>witha lower maximum resistance, or put a resistor in parallel with the pot
>so that even with it turned all the way "down", enough juice will reach
>the motor so it still operates the fan.
>
>Can anybody get me started?
>
>Which method makes more sense to you guys? How would I guestimate the
>proper sized resistor?
>
>--
>If you can't say something nice,
>say something surrealistic.
> - Zippy
What type of a motor is used? If it's the kind that runs off DC too,
you're in luck. There was a circuit posted here recently to regulate a
motor's speed by giving it a voltage that's compensated for the motor's
losses.
The kind that runs off AC only is a problem. They're very weak when
they're not running at normal speed. You could try to put a thermistor
in the dimmer for feedback but it would probably cycle.
I think the easiest method would be to restrict the airflow with a
sliding panel.
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