Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics (1892)
Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 246
Fig. 72.—Wenstrom dynamo. that two exciting coils are sufficient, the iV-poles being energized direct, and the two consequent6^-poles by induction. The brushes are placed at an angle of 90° on tlie commutator. Usually the space between the magnet-polos and core of the armature must be sufficientnot… … FiG. 73.—Wenstrom dynamo—section. ductors in which the currents are induced. This gap introduces a very high magneticresistance in the circuit for the magnetic induction. To avoid this, therefore, the conductors 228 DYXAMO-ELECTRIC MACHINES. are buried in grooves or holes (Fig. 74). The distance…
Mechanical engineering
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