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DRV8305: BEMF value in DQ reference frame

Part Number: DRV8305


I have measured the back emf  waveform between two motor terminals (phases) and it looks like so:

So I have 9V peak-peak (4.5V Amplitude).

It is sine, but in D-Q reference frame it will be constant DC waveform (at a specific speed).

What will be the value of Back EMF in D-Q reference frame?

is it 9/2/sqrt(3) ?