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Reducing speed of an electric motor

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Lloyd Smith

08-29-2002 17:11:41




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IWANT TO SLOW DOWN THE SPEED(RPM) OF AN ELECTRIC MOTOR. 1/5HP 1725 RPM SINGLE PHASE 120 VOLT 2.5 AMPS 60HZ.HOW DO I DO THIS?WOULD IT BE COST EFFECTIVE,OR AWASTE OF TIME AND MONEY? THANKS SMITTY




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Neil

08-30-2002 12:56:00




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 Re: reducing speed of an electric motor in reply to Lloyd Smith, 08-29-2002 17:11:41  
Since it is a 1725RPM motor it most likely will not take kindly to the "Lamp Dimmer" aproach.
If it is a capacitor start motor (most likely it is) it will not like a variable frequency drive either.

What exacly are you trying to do, and lots of people will here will give you lots of good sugestions.



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reostat?

08-30-2002 04:27:19




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 Re: reducing speed of an electric motor in reply to Lloyd Smith, 08-29-2002 17:11:41  
like a light dimmer sw but hd



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paul

08-30-2002 09:46:50




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 Re: Re: reducing speed of an electric motor in reply to reostat?, 08-30-2002 04:27:19  
Some electric motors work with these, others burn up..... Some motors will slow down, others will heat up trying to maintain rpms as power is reduced. I don't have enough knowledge to be more specific then that.

The pulley option is the best, if that doesn't work, figure out exactly what type motor you have (brushes, poles, capacitor, AC or DC, etc.) and talk to your favorite electritian/ electric shop. You might have to get a different motor to handle voltage or frequency controlers that change speeds.

Short answer is, it's possible, but you will need to match the motor type to the controller type. Have a fire extingsher handy if you get it wrong... ;)

--->Paul

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wrenchman

08-30-2002 01:31:20




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 Re: reducing speed of an electric motor in reply to Lloyd Smith, 08-29-2002 17:11:41  
to reduce output speed,the simplest way is to change pulley sizes in drive setup...if direct drive,you will need to install a jackshaft so you can add pulleys...just put jackshaft where motor is now & set motor alongside & figure out pulley sizes to get speed required...



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Cliff (VA)

08-29-2002 18:25:50




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 Re: reducing speed of an electric motor in reply to Lloyd Smith, 08-29-2002 17:11:41  
The rotational speed of most common AC motors is set by a number of parameters including the frequency of the AC Power (60 Hz in the US), the number of poles in the motor, and other design considerations. To make a long story short, you really cannot change the speed because it is "locked" to the line frequency.

There are AC drives that are designed to change the speed of AC motors, but we are talking serious industrial devices and serious money.

My suggestion would be to buy a DC motor and controller. One of my woodworking catalogs offered a 1/2 horse motor ~$200. Granger would be another good place to try.

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Mark Kw

08-30-2002 07:08:26




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 Re: Re: reducing speed of an electric motor in reply to Cliff (VA), 08-29-2002 18:25:50  
There are a number of small AC variable speed drives available for fractional horsepower motors. These range from voltage reducers to variable frequency controllers. Voltage reducers are dangerous if used on a motor that is not designed for use with one. VFD's (variable frequency drives) can usually be used on any AC motor but you check with the mfg of both the drive and motor to ensure safe operation. Prices on these can range from around $50 and up depending on size / type. I've seen some smaller ones in use on different things but have no personal experience with them so I will not even consider suggesting a brand or type. I have worked with some Reliant and GE heavy indsutrial VFD drives but these are the ones that start around $4,000. DC drives and compatible motors can also get into some serious bucks too.

Do a search for "VFD drives" and go from there.

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Chester

08-31-2002 11:46:22




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 Re: Re: Re: reducing speed of an electric motor in reply to Mark Kw, 08-30-2002 07:08:26  
Universal type motors ( the ones with brushes and a commutator ) are the ones that can be slowed down with a variable resistance ( rheostat and some cases light dimmers ) If it has no brushes, by reducing the input voltage it will run hot or worse, go up in smoke. Univ. type motors are found in most routers, hand drills, fans, small grinders, sewing machines, etc.



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