Connect with us

Running three phase delta on single phase

Discussion in 'General Electronics Discussion' started by pidja105, Feb 22, 2016.

Scroll to continue with content
  1. pidja105

    pidja105

    106
    1
    Oct 16, 2015
    Hello,
    I have three phase motor wired to delta, but I don't have access to the inside.I only have three wires coming from motor,
    can I rewire that three wires to use single phase without opening(that motor is very small)?
     
  2. Minder

    Minder

    2,955
    624
    Apr 24, 2015
    If it is a sub fractional motor you may get it to run by using a motor run rated capacitor in series with one of the windings to obtain a phase shift as is done with 1ph motors.
    The other two would go to the supply, do you have the 1ph voltage available for the same rating as the 3ph motor?
    M.
     
    hevans1944 likes this.
  3. Bluejets

    Bluejets

    4,061
    848
    Oct 5, 2014
    Three phase motors have their windings separted 120 electrical degrees apart and require a supply of the same nature.
    Any capacitor connected arrangement would be theoretical and rather low in torque if at all applied and perhaps require a "hand start" not to mention current characteristics way off the original.
     
    Last edited: Feb 22, 2016
  4. Minder

    Minder

    2,955
    624
    Apr 24, 2015
    I have built some of the popular 3 phase generator (RPC) that became popular in the '90's, these use a 3ph motor ran off of 1 phase to produce/generate a three phase output 120° apart.
    For a small motor it will work just as well, been done many times.
    M.
     
  5. Bluejets

    Bluejets

    4,061
    848
    Oct 5, 2014
    Single to 3 phase inverter.
     
  6. Minder

    Minder

    2,955
    624
    Apr 24, 2015
    Single to three phase invertor is usually a solid state device achieving the same thing.
    RPC uses a motor as a generator.
    http://www.metalwebnews.com/howto/ph-conv/fig1.html
    You will see some sites that state (in error) the 3 ph are not 120° apart.
    M.
     
    hevans1944 likes this.
  7. Minder

    Minder

    2,955
    624
    Apr 24, 2015
    The PhasePerfect S.S. invertor also uses the 240v 1ph passed directly though for 2 of the phases as does the RPC, they are also 120° 3ph.
    M.
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-