Single phase 2 pair BLDC Driver

Discussion in 'General Electronics Chat' started by ErfanSamadi, Sep 23, 2013.

  1. ErfanSamadi

    Thread Starter New Member

    Sep 23, 2013
    dear members
    i want to design a single phase 1pole pair BLDC Driver in matlab simulink
    but wen i apply voltage to circuit rotor moves and then stop in specific theta
    i want to rotate it in specific speed
    please help me


    View attachment
  2. shortbus

    AAC Fanatic!

    Sep 30, 2009
    Not quite sure what your meaning here? Since a BLDC motor is a three phase DC motor, a single phase driver will only move the rotor one pole space. To make the motor rotate at speed, you need three drivers to do it. And then they must be synchronized with the rotor magnet pairs for each pole.
  3. MaxHeadRoom


    Jul 18, 2013
    A BLDC motor only energizes two winding at any given time,
    You would need at least two phases to index, but it would not be a very smooth or practical motor, unless you have a very large number of poles.
    1 pole pair will oscillate across 180°, result, no motion, this is why 1phase motors use a method to produce a second phase artificially.
    You also require a means of commutation, Hall switches for e.g. as Shortbus mentioned.
    Last edited: Sep 23, 2013