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Author Topic: Wiring a 3 phase motor  (Read 907 times)
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mingki
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Hi, I am trying to wire a three phase motor(1.5Kw, 1750RPM, 60Hz) at my home and I need to drive this motor by using 220V.
Could you advise me how I should wire this motor?
http://www.flickr.com/photos/34955071@N02/6476924039/in/photostream
http://www.flickr.com/photos/34955071@N02/6476923523/in/photostream
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St. Louis, Missouri
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Do you actually have 3 phase at your home? If not you will need a converter. There are several types you could use depending on your application. We need more information.
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mingki
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oh.. I have single phase at my house. I am sorry.
I changed the motor as below so that I could be ran at home.
The motor's specification is 110V, 60Hz, PH1, 1750rpm, 1.5Kw.
Could you advise me how I should wire this motor so that it could be run at my house?
It's my first time to wire such big motor and I am desperate for help. 
http://www.flickr.com/photos/34955071@N02/6481661725/in/photostream
http://www.flickr.com/photos/34955071@N02/6481664927/in/photostream
http://www.flickr.com/photos/34955071@N02/6481662521/in/photostream
http://www.flickr.com/photos/34955071@N02/6481662521/in/photostream
http://www.flickr.com/photos/34955071@N02/6481662019/in/photostream

And, I wonder what these are. Are these capacitors?
http://www.flickr.com/photos/34955071@N02/6481663915/in/photostream
http://www.flickr.com/photos/34955071@N02/6481663543/in/photostream
http://www.flickr.com/photos/34955071@N02/6481663543/in/photostream
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You say your house supply is 220 volts and your new motor is 110 volts. 

To put it bluntly there is no practical way to operate your motor from the mains supply. 

You could use a LARGE step down transformer, as used for industrial tools but this would need to be rated at least 3kW to get the motor started (5kW rating would be better). 

Basically, exchanging the motor was not the ideal way to go

Your original 3-phase motor was a much better bet, using a single-to-3 phase invertor.  This would have allowed variable speed capability form almost 0RPM to 3500RPM (twice your original motor speed)

Themodules you enquire about are indeed capacitors.
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Dubuque, Iowa, USA
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mingki you need to tell us what country you're in so that we can understand the nature of your home electricity.

Yes, "those things" are the start and run (if there are two) capacitors.
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mingki
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Thank you for your advise. I confussed you due to my bad explanation. I have both of them(3 phase, 1 phase) and I decided to use single phase motor which is not a good solution as you pointed out.
Your original 3-phase motor was a much better bet, using a single-to-3 phase invertor.  This would have allowed variable speed capability form almost 0RPM to 3500RPM (twice your original motor speed)
Could you tell me what type of single to 3 phase invertor I need and how to use it? Variable speed capability is definitely what I need at the moment.
mingki you need to tell us what country you're in so that we can understand the nature of your home electricity.
I am in South Korea.
The two motors I have right now is attached to hydraulic units and I am planning to use this hydraulic unit to power a hydraulic cylinder, hydraulic motor. Arduino will control this hydraulic unit.
This is the schematic of single phase hydraulic unit.
http://www.flickr.com/photos/34955071@N02/6484322559/in/photostream
and this is the schematic of three phase hydraulic unit.
http://www.flickr.com/photos/34955071@N02/6476924515/in/photostream
« Last Edit: December 09, 2011, 07:44:59 pm by mingki » Logged


Dubuque, Iowa, USA
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Connecting your 110V motor should be possible with the nature of your wiring however this is not something I'd be comfortable describing without the ability to see exactly how your electrical circuit is wired. Your picture shows what is needed for the wiring; take that picture to a professional electrician -- or even a knowledgable sales clerk at a store that sells electrical supplies --  and ask for advice. Note that per your hydraulic diagram you need counterclockwise rotation (bottom half of the picture).

Your hydraulic diagrams (the last two pictures you posted) are not related to single phase or three phase operation. Those are the paths for the hydraulic fluid in the system. The only difference is that the second shows a piston and some kind of pressure control valve in the circuit.

Out of curiosity, what are you building?
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I know it takes professional support, but I want to try out myself. I hope I could get either motors to work at home so that I can have hydraulic motor and cylinder to work with my hydraulic unit.
Using hydraulic motor, i want to build a some kind of horizontal lathe for cutting steel plate and also I want to build a pressing machine using hydraulic cylinder powered by this hydraulic unit.
I hope I could have variouble speed control capability as well.
Could you give me some more guideline how I could get either motors to work as I intend to do?
« Last Edit: December 10, 2011, 05:44:33 am by mingki » Logged


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