Janicholson said: (quoted from post at 19:21:19 11/23/09) The phase relationship of the brushes to the armature windings account for current lag and the dynamics of the magnetic field in one direction over the other. Not much but enough to show output differences if the brushes are rotated manually to the sweet spot , then reversed in rotation. And you are correct on the brush curve dynamic, but the point of contact is found with less science, and more design trial reality. Great discussion, JimN
Jim, if I may, I would also add that the minimum brush arcing is at your 'sweet spot' or flux-neutral axis, which is at a different polar position if rotated in the opposite direction. If rotated in opposite direction without relocating brushes to the 'new neutral axis there will be greater brush arcing & shortened brush life.
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