Total current used by a brushless DC motor
Motor line current is just the peak of any individual phase's current. Notice that in any of the six commutation steps, one phase always has no current, while the other phases have equal and opposite current (well, they should, the rounded leading edges in your diagram are wrong). This makes sense, as the phases are Y-connected so the current must always flow into one phase and out of another (in BLDC motors, one phase is always idle).