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 - Harvestin Corn in Southern Wisconsin: The Early Years - by Pat Browning. In this area of Wisconsin, most crops are raised to support livestock production or dairy herds in various forms. Corn products were harvested for grain, and for ensilage (we always just called it 'silage'). Silo Filling Time On dairy farms back in the 30's and into the first half of the 40's, making of corn silage was done with horses pulling a corn binder producing tied bundles of fresh, sweet-smelling corn plants, nice green leaves with ear; the
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