Thomälen, Adolf, 1865-, Thomälen Adolf. Kurzes Lehrbuch der Electrotechnik. English · London, E. Arnold · leaf 470
mmetrical at everymoment with regard to the six poles. The alter-nating E.M.F. induced in the 3-phase winding istherefore independent of the excitation of the auxiliary poles and dependsonly on the main poles. With regard to the brushes rubbing on thecommutator, each half of the armature has two… … 456 Electrical Engineering Hence by var3dng this excitation, the ratio of the continuous to thealternating voltages can be adjusted within certain limits. It is easily seenthat the main poles are unnecessary, for if the three upper auxiliary polesare equally excited in the same direction, viz. as N…
Electrical engineering
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