×
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

motor 50 or 60 hertz

motor 50 or 60 hertz

motor 50 or 60 hertz

(OP)
Hello,
I am new to this site and I have a question about a motor being 230 volts 50HZ being sent and used in Hong Kong where there electric is 50HZ and 220 volts. The motor would be purchased from Graingers in the US.  I heard that the power overseas has one hot leg and in the US we have two hot legs.  So this has led me to some confusion.  The power in the US has two 115 legs and they have one 220 leg.

RE: motor 50 or 60 hertz

The important thing is what the motor sees. It doesn't mind if wires are "hot" or not. All it cares about is the voltage difference between the two wires. Motors don't get "confused" by words.

As long as the ratio volts/frequency is OK, the motor will do its work. So, if you have a 230V/50 Hz motor, the V/Hz is 4.60.

Now, if you connect to 220V/60 Hz motor, the ratio will be 220/60, which is 3.67. That is too much off the ratio the motor was designed for. So it will not work well.

But, if your voltage is 220V/50 Hz, the ratio is 4.40 and that is OK. The motor will work well. The tolerance is usually +/-5 %. So any ratio between 4.37 and 4.83 would be OK.

Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

RE: motor 50 or 60 hertz

Hello folks, are the theory involved applicable to power transformers as well since the equivalent circuit of an induction motor is almost the same of that of a transformer?



















GO PLACIDLY, AMIDST THE NOISE AND HASTE-Desiderata

RE: motor 50 or 60 hertz

In a very broad sense, yes. But, since there is a variable called slip involved, you cannot do anything useful with the basic transformer formulae.

Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

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