[macdowswe]

150A or 75A current through that PCB those FETs, those wires and those connectors?
Really?????
Cheers
Roger

Yeah ;D
This is not a continuous rating, but peak rating. The continuous rating will be significantly less than that.
But it is the peak rating that is important, as the the torque peaks only during the first bit of acceleration in a move, and the last bit of deceleration. If you are using the torque to push continuously into a workpiece, the system should be dimensioned such that you would use much less current for that.