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
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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