Dip in voltage in the line phases of motor

Discussion in 'General Electronics Chat' started by electronicsLearner77, Jan 3, 2018.

  1. electronicsLearner77

    Thread Starter Active Member

    May 26, 2012
    95
    1
    I am driving a BLDC motor using trapezoidal commutation table. But i am finding a dip in voltage for a short duration on the positive side of the phases R, Y, B. Similarly there is a rise in voltage during the negative cycle. I am not able to understand the reasons. Any advice?
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
    15,683
    4,566
    Post the hook up and circuit used.
    How are you sensing commutation point.
    Max.
     
  3. electronicsLearner77

    Thread Starter Active Member

    May 26, 2012
    95
    1
    Sorry for the late reply. I do not have access to the schematic diagram. But i am doing commutation using Hall sensors. I am checking the waveform at the R, Y, B terminals of the motor. I am observing this behavior on every hall change. I want to know while switching the Mosfets for every hall change will there be any fluctuation on the phase line voltage? Why does it happen?
     
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