How to generate three phase sin wave

Discussion in 'The Projects Forum' started by charan0202, Mar 1, 2010.

  1. charan0202

    Thread Starter New Member

    Mar 1, 2010
    sir can any body tell mee how to control three phase sin voltage using single varaic . my aim is to generate 50hz 15 v three phase whose magnitude can be varied between 0-15v please help me
  2. beenthere

    Retired Moderator

    Apr 20, 2004
  3. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    Could be done safely electronically say, using a phase-locked loop locked to a low voltage single phase 50Hz input. A 'crude' 3-phase generation could be done within the loop using a 3-stage Johnson counter. The 3-phase square waves could be filtered to produce a reasonable sine wave in each case. Amplitude control could probably be accomplished using an appropriate technique - the trick being to do it concurrently for all three phases.
  4. eblc1388

    Senior Member

    Nov 28, 2008
    Three-phase variac + three mains/15V transformers(or one three-phase transformer).
  5. t06afre

    AAC Fanatic!

    May 11, 2009
    For a education demo. I once used Labview, sound card, and a external amplifier. Just then I was writing this the idea of using a allpass filter (Google it) came to me. After some fine tuning it may work for you(or not). But it is easy test on bread board