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Tool Talk Discussion Forum

110/220 elect motor question

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john in la

01-12-2006 09:43:50




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I would like to hear the pros and cons of running a convertible motor (table saw; well pump; ect) on 220 or 110.

If I had a choice which way should I go??
Does using 220 really make a motor last longer?




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Kevin Bismark

01-13-2006 19:38:29




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 Re: 110/220 elect motor question in reply to john in la, 01-12-2006 09:43:50  
The real reason we wire motors to run on the higher voltage is they draw less currant when they are running, a motor draws the same amount of power when running about 746 watts per horse power, so power is power, it's not cheeper but you can run them on smaller wire at the higher voltage and if you are a little way's away from the transformer the motor may not be able to start at the lower voltage with the voltage drop, have fun, it's not usually that big of a deal..

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TerryOH

01-13-2006 13:39:03




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 Re: 110/220 elect motor question in reply to john in la, 01-12-2006 09:43:50  
An AC motor can draw 2 to 5 times it full load rating while starting. This is why on 110V the lights dim and the motor seems to struggle, and on 220V it starts easily. If you are not concerned with portability then generally you will get better performance and motor life using the higher voltage



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jeffcat

01-12-2006 16:16:17




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 Re: 110/220 elect motor question in reply to john in la, 01-12-2006 09:43:50  
Go with 220 if you can. Less stress and strain on switches, wires, fuses, and faster spinup.
Go with the 220; you"ll be beter off. Jeffcat



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Ancient one

01-12-2006 12:55:23




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 Re: 110/220 elect motor question in reply to john in la, 01-12-2006 09:43:50  
The motor does not care if so designed and wired properly. The main con is usually in the switch life.



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old

01-12-2006 10:32:57




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 Re: 110/220 elect motor question in reply to john in la, 01-12-2006 09:43:50  
Lets see if I can keep it simple and no arugments either LOL. 220 if wired right, produces a little more power out for the same motor on 110. Its a little less lickly to stall if under a heavy load. Which means less heat and longer life. Aslo on start up like on a compressor where they start with a load do do so faster I.E. get up to top RPM faster.



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Coloken

01-12-2006 12:08:01




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 Re: 110/220 elect motor question in reply to old, 01-12-2006 10:32:57  
I'll go with Old. On a small motor , like 1/2 Hp, 110 works fine. As you go higher in HP, the need for 220 increases. 3 HP well pump or table saw,all most all ways 220. I will stick my neck out and say a one horse is about top for 110. Actually, I have a 2 hp running a portable compressor. I have to be carefull what plug in I use and use good sized extension cord. It would be pretty hard to chase it around the yard if it were on 220. Please note, those China made things lie so bad on HP I don't even want to talk about it.

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JMS/MN

01-13-2006 09:19:09




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 Re: 110/220 elect motor question in reply to Coloken, 01-12-2006 12:08:01  
Watts = Amps x volts. Watts divided by 745 = TRUE HP. I did the math from the nameplate on a used compressor I just bought. Tag said 6 hp. Actual works out to 4.4 hp. I never believe the advertised hp- they like to call it 'maximum developed hp'.



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Gary Schafer

01-13-2006 10:47:37




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 Re: 110/220 elect motor question in reply to JMS/MN, 01-13-2006 09:19:09  
Multiply that by the power factor if they show it.

Regards
Gary



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