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variable speeds - 10/30/2007 11:44:14 AM

FRSguy

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Joined: 9/4/2007
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How do you make an electric motor variable speed.. I am curiouse about making a fucking machine out of a garden tool that uses a plug in electric motor however I want to be able to slow the motor down so to speak.

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RE: variable speeds - 10/30/2007 11:59:46 AM

Phin

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hard wire it with a fan dimmer switch. note I said fan dimmer not a light dimmer. In case you missed it use a fan dimmer...

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RE: variable speeds - 10/30/2007 12:03:40 PM

FRSguy

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AHHHHH!!
perfect!!

Thanks

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RE: variable speeds - 10/31/2007 2:37:40 PM

Irishm57

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One mention on the "fan dimmer" . Make sure you check what the motor current is and what the dimmer can handle. or you might get fried. Or start an electrical fire if the motor current is higher than the dimmer is rated for
Also if you are thinking of an "electric mower" motor, i seriously doubt you will get it to go slow enough with any form of control and have enough torque to run. Most lawn mower motors are over 1000 rpm not even a variac can bring them down to a suitable speed for a "fuck machine"

I made mine from a 12 vdc motor that had a gear box that reduced it to 6 rpm on the output side of the gear box . it was from an industrial surplus store.

< Message edited by Irishm57 -- 10/31/2007 2:38:40 PM >

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RE: variable speeds - 10/31/2007 2:49:00 PM

FRSguy

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Its actually an electric chain saw motor which is surprisingly small but I might run into the same problem.

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RE: variable speeds - 10/31/2007 4:02:01 PM

baddog123

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Yeah, the 12 volt motor sounds safer to me.
Gearmotors are the way to go.
There are tons of speed control hobby projects and kits on line.
You should use an isolation transformer on any AC powered device.

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RE: variable speeds - 11/1/2007 11:26:31 AM

vtviceversa

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One thing to pay attention to if you do this: not all electric motors operate happily at reduced speeds. It depends on the type and construction as well as the reduction method used. Typical symptoms will include excess heat, and if you get this, I would probably stop the speed reduction. Windings melt, and bad things happen (nothing wrecks the mood faster than a smoke alarm :) )

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RE: variable speeds - 11/3/2007 12:06:53 AM

Themistokles

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http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=43060

Ten dollars, no rewiring necessary.

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