×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

3 phase -> Single phase?
3

3 phase -> Single phase?

3 phase -> Single phase?

(OP)
I have a three phase motor running a piece of woodworking eqiupment, and cannot get access to three phase power.  
On the motor plate, it states:
220/380V
5.9/3.4A
It is possible to rewire this motor to run on single phase (220V)?

Thanks!

RE: 3 phase -> Single phase?

No, but you may consider buying an electronic inverter that converts sigle phase to 3 phase.

or replace the motor with a sigle phase motor, for such a small size motor it may be more economical option provided mechanically the new motor fits in the existing apparatus.

RE: 3 phase -> Single phase?

you might find that the motor/generator sets are more economical. they use single phase motor to turn a three phase generator. The shop sized units are self contained and work just fine. Shop around on the used / surplus equip. market. They are readily available.

Do not try to operate a polyphase motor on single phase. It will only damage the unit.

RE: 3 phase -> Single phase?

Suggestion: Start with a simplest and reliable solution. It is the single phase motor. The existing three phase motor can be trade in.
Visit
http://www.thomasregister.com
and type Motors: Single Phase under Product or Service, which will return 87 companies to approach to for a deal

RE: 3 phase -> Single phase?

Your motor appears to be about 2.2kW, which is the largest common rating of a 1-ph / 3-ph inverter for connection to a 240V 1-ph source in Europe. I'm not sure what the largest common rating is for the US market.

One problem you may well find with trying to replace a 3-ph motor with an equivalent 1-ph motor is that the 1-ph machine will be significantly larger, and may not fit within your machine.



-----------------------------------

Start each new day with a smile.

Get it over with.

RE: 3 phase -> Single phase?

the motor/gen sets are common in this area where the machines are of european origin. good luck

RE: 3 phase -> Single phase?

Use an AC drive (inverter). For this size motor, a basic volts/hertz drive will be relatively inexpensive. Don't forget to derate the drive.

RE: 3 phase -> Single phase?

Comment on rsdoran (Electrical) Mar 4, 2004 marked ///\\\
If you have the time you can develop a 3 phase system. Checkout this: http://www.patchn.com/3phase1phase.html
///The motor for the three-phase power source will not be symmetrically loaded; therefore, at full loading it could experience negative effect due to internal harmonics, elevated temperature, etc.
The power quality of this source should be tested. If the power quality is not adequate, suitable treatment to improve the power quality will be necessary. This is not an inexpensive proposition in comparison to the off the shelf single phase to three phase electronic AC-DC-AC fixed frequency converter.\\\

RE: 3 phase -> Single phase?

I would suggest purchasing a VFD inverter and use it as a phase converter. There are many brands in the market place offer single phase input with 3 phase output. The upside you then have variable speed woodworking machine, & depending on what type of machine, might help on some your projects.

RE: 3 phase -> Single phase?

sell you equipment on e-bay and purchase the correct phase equipment.

RE: 3 phase -> Single phase?

Suggestion: Try to obtain the prospective single-phase motor dimension and fit first. If it does not work out, then the single-phase motor drive with three phase output or AC-DC-AC converter will be required. If the converter is rated higher, the output may be used for other three phase loads that may come in the future. It may or may not be that bad deal.

RE: 3 phase -> Single phase?

I agree with jbartos, the proposed solution at http://www.patchn.com/3phase1phase.html
is complicated and expensive and will not provide a balanced three phase output voltage. That unbalance voltage will be detrimental for the operation and life expectancy of a three phase motor.
The single phase to three phase electronic converter seems to be the more simple and lower cost solution.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources