×
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

Using 120V, 60 Hz Single Phase Motors in Europe

Using 120V, 60 Hz Single Phase Motors in Europe

Using 120V, 60 Hz Single Phase Motors in Europe

(OP)
I am sending a tri-volt (120/208-230), single phase motor (60 Hz) to run in the United Kingdom for a pumping application.  (415V)

Will this motor work reliably if I make the "high voltage" connection on the motor?  

230V/60 = 3.833 = V/f
3.833 x 50Hz = 191.65V = New voltage req'd.

I assume to have ~240/1/50 service.

Should I simply replace teh motor on this




 

RE: Using 120V, 60 Hz Single Phase Motors in Europe

I would replace it: the over-voltage is too severe. Although our nominal voltage is 400/230V to align us with Europe it is still supplied from the same 415/240V infrastructure so in most locations you will see 240V. Worst case is 254V if the supply was right at the top end of the permitted range.
  

----------------------------------
  
If we learn from our mistakes I'm getting a great education!
 

RE: Using 120V, 60 Hz Single Phase Motors in Europe

If the motor is rated for 230V, how can there be an overvoltage?

I'm asking this because I don't know, not to be argumentative.  I know nothing at all about 50Hz applciations, and would defer to ScottyUK or most anyone else on this site.....

RE: Using 120V, 60 Hz Single Phase Motors in Europe

Besides, the reactance of the start capacitor will be 6/5 of what it should be; also the run speed at 50Hz may not be high enough for the motor to switch from start to run.

RE: Using 120V, 60 Hz Single Phase Motors in Europe

peebee;
Search volts per hertz on this site. Also see the FAC by itsmoked on converting motors from 60 Hz to 50 Hz and vice versa.
 

Bill
--------------------
"Why not the best?"
Jimmy Carter

RE: Using 120V, 60 Hz Single Phase Motors in Europe

Okay, so the problem is really overcurrent.  Got it.

RE: Using 120V, 60 Hz Single Phase Motors in Europe

More over-fluxing - too many volts per turn at the lower frequency for the core not to saturate magnetically. Saturation is bad news. You're right in that the problem shows up as high current.
  

----------------------------------
  
If we learn from our mistakes I'm getting a great education!
 

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