Thomälen, Adolf, 1865-, Thomälen Adolf. Kurzes Lehrbuch der Electrotechnik. English · London, E. Arnold · leaf 154
ion.—56. Three-wire dynamos. 51. The Excitation of Dynamos. The earliest machines in which electromotive force was induced by themotion of a wire in a magnetic field were provided with permanent magnetsof hardened steel. They were built up of laminations which gave muchstronger magnets than could… … Fig. 122 It was a great advance, therefore, when Dr Wilde of Manchester passedthe current obtained from the two-part commutator of a small permanent-rmagnet dynamo around the wrought-iron poles of a second dynamo. Sincewrought-iron has a high permeability, it follows that the magnetic flux inthis…
Electrical engineering
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