Below is the waveform i captured while motor running
Which hardware is this on?
Are you still using ST Motor control studio?
It’s hard for us to help based on this information…
If I had to guess based on the pictures, I’d say you have MOSFET ringing…
Sorry for late reply i am trying everything to solve the issue and found this paticular behavior. I have written the debug code to output the pwm duty cycles A,B,C using DAC and compare with the phase currents, i plotted the PWM DAC output and the phase currents
Is this with a motor attached? Transients like this will be filtered at the motor if one is attached.
Does your mosfet have any gate resistors? This would limit the slew rate if that’s what’s causing ringing, you could experiment with some different values.
Yes it is with motor attached and running with noise. Why phase C current waveform different from others?
I’m not sure. Maybe because Ic should be equal to Ia + Ib (KCL).
Why are the signals not out of phase? You have a 4ch scope- can you plot all at once?
They same to be out of phase i will plot 3 of them together, at present i have plotted 2 phase currents and one line voltage.
I agree it is strange that just this phase looks different… but I do not have an explanation for you 
If you change the driver pin ordering (e.g. change U and V phase pin definitions in firmware) does the artifact follow a pin or does it remain on the same physical phase?
Are you using custom hardware? Can you show a schematic?
Thank you for help one solution i found is, if i place a capacitor in the current sensing circuit the behavior of phase C getting distorted is observed as per the previous post. I removed the capacitors in the phase current sensing then 3 phases are coming similar but with distortion.
