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Member

Join Date: Jul 2010
Posts: 5

Electric Motor/Capacitor Specs and Connection

07/11/2010 7:03 AM

Hi everyone, I was wondering if anyone could help me with this problem. I'm actually thinking on making my own wood lathe with this motor that was in a washing machine; problem is that I have 3 cables going out of the motor, red, black and blue. I am guessing that 2 of them are for the live wiring and 1 is the neutral, but I am not sure of which one is which one. It's a 173W 60Hz 110V AC motor. When I was taking it out I also noticed that there was a big capacitor with 4 terminals on it, on the terminal side there is this numbers on it between the terminals; one pair says 28 and the other 50 with different cable colors connected to them. I am guessing these are for 2 different capacitors in the same enclosure. I would also like to ask someone to please clarify the temperature that it shows. Sorry to sound like a newbie but as a Mechanical engineer, Electrical motors are not my strong. It would be great if someone tells me how to connect these two devices together. I added some pics for you people to have a more clear idea of my question.

Thanks in advance.

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#1

Re: electric motor/capacitor specs and connection

07/11/2010 7:26 AM

Normally before dismantling or rectifying, the process starts with making a diagram from the existing to know its working conditions, when you removed from the Washing machine you should have noted its earlier connections making a rough sketch from it. As these things can only be confirmed if we have clear data of the motor and the capacitor. which can be obtained from the manufacturer.

As per the photos it seems a single phase motor but with a capacitor in series we can know the connection from the previous connected state only.

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#4
In reply to #1

Re: electric motor/capacitor specs and connection

07/11/2010 9:56 AM

Right on, but as I remember the washing machine was quite old, the diagram in the back part of it was quite blurred with moulds and most of the cables were just hanging there. I should have payed more attention back then you are right...any suggestions?...Thanks in advance.

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#8
In reply to #4

Re: electric motor/capacitor specs and connection

07/12/2010 2:49 AM

What he meant was that you should make a drawing of all the connections before you start taking it apart!!

All you have is a single phase induction motor with either a start capacitor or a start and run capacitor......

If you can wire them together as they were before, it should start & run.

As already mentioned, its way too low a power for normal wood turning, or are you only going to turn up tooth picks and the like? Then its fine.

If I was you, I would go to a scrapyard and look for a 3 to 5 HP single phase motor 110 volts AC, still attached to its starting capacitor. Test it, Take a Megger and check the insulation properly before purchase, (I have seen some motors that looked about a 1000 years old but worked just fine) and if it works and the insulation is also good, sort out a price!!!

If the bearings are noisy, pay less! And replace the bearings with the same type before installing.....

Scrap price is usually just the copper content!!

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#2

Re: electric motor/capacitor specs and connection

07/11/2010 9:41 AM

Stop! Halt! Wait! I hate to rain on your parade, but, unless you're turning toothpicks, you don't have enough motor there for any serious woodworking. Maybe some of the woodworking guys can help.

There are woodworking forums, too. Good luck.

173 watts = 0.231996821 hp

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#3
In reply to #2

Re: electric motor/capacitor specs and connection

07/11/2010 9:53 AM

You are right mate, it might be low for wood turning. But I have seen some mini lathes in the web with 1/4 hp motors on it; and I thought mine might be kind of closer to the number. Don't know, just an idea, plus it's a free motor ;)....any suggestions would be greatly appreciated. Thanks.

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#5
In reply to #3

Re: electric motor/capacitor specs and connection

07/11/2010 10:09 AM

Oh, in that case go for it! I envisioned someone turning table legs. Sorry for the red flag. Put that free motor to use.

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#6
In reply to #5

Re: electric motor/capacitor specs and connection

07/11/2010 10:35 AM

do you have any suggestions/ideas for the motor and capacitor's connections?

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#7
In reply to #6

Re: electric motor/capacitor specs and connection

07/11/2010 10:43 AM

Sorry, electrons give me headaches. If there's no schematic, I'm lost.

Don't worry though. There are some really smart people here who know about such things and once they see that you are trying to cobble a DIY lathe together, they'll help you figure out the hook-up.

Good luck.

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#9

Re: Electric Motor/Capacitor Specs and Connection

07/12/2010 3:00 AM

I will try and help with your dilemma, (or make it worse). The leads out of the motor is both power leads one for fast and one for slower. To check wich is which, you may measure the resistance from neutral to one of the lines. The higher resistance of the two will be your slow speed. The capacitor is a combination start and run capacitor. The temp on the cap is simply the ambient temp's range within which the cap will safely operate. BUT, are you sure you want to use this "micky mouse" motor for a wood lathe?

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#10

Re: Electric Motor/Capacitor Specs and Connection

07/12/2010 10:03 AM

I strongly recomend that you look to another motor it will be on the small side for what you want. A 3/4HP motor is probably as small as you want to go for a small machine.

Also your motor is an open style and will choke with wood dust you need an enclosed design.

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#11

Re: Electric Motor/Capacitor Specs and Connection

07/24/2010 8:44 PM

Thanks everyone for all the info you all have given to me, I would like to ask something else; should I add some circuit/motor whatever proctection ckt to the design of my minilathe?

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