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Hermann Aron
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6724. Aron, H. March 19. Energy meters.-An induction motor meter, for a single small alternating current, has a conductive disc a revolved by passage between a laminated electromagnet b, a main-current coil h, and an armature e, and retarded by passage between a permanent magnet i and an armature k. The electromagnet b is excited by pressure coils c, d, and carries closed copper circuits f, f<1> to place its magnetic flux in quadrature to the applied pressure. A block g of laminated iron carries the main-current coil h, between the poles of the electromagnet, with intervening air-gaps.
GB190406724D1904-03-191904-03-19Improvements in Electricity Meters for Alternating Currents
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