BLDC Y-shaped motor with Hall sensors generating different combination of back EMF on windings with different direction?
Before making an erroneous conclusion you have to understand how hall sensors for detecting a rotating PM field inside a BLDC works.
They change its state when pole changes, for example it turn to HI when passing N-&gt;S an they turn LO when passing S-&gt;N pole. If you spin the rotor backwards, then the same position at transition 1-&gt;0, now corresponds at transition 0-&gt;1 and the BEMF changes its sign due to negative rotation sign.
You can see that those signals you have marked at transition 1-&gt;0 correspond to +peak value on certain phase. Now observe the transition 0-&gt;1 of the same sensor, you'll see you get the -peak value of the same phase.