I am going to make a sensorless BLDC controler with TMS320f28335,using open-loop acceleration to get the motor rotated.I select a traditional approach called back-emf detection. now my motor can rotate successfully and it can accelerate up to a high speed. I check the phase-to-ground waveform, find that it isn't similar with those waveform I saw on some documents. I am not sure if my waveform is right. I just wacth it directly without filtering for the phase port(I don't add RC low pass filter between phase and the ground)
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could u please tell me whether those waveforms are correct or not, I am a bit confused now, cos the motor can rotate.....here comes the question,why the motor can work but not showing me the standard waveform(assuming that the back-emf waveform I saw from the book is right)
Thank you very much
regards
