This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1902 Excerpt: ...lie in separate slots. Thus, in the former case the flux of self-induction interlinked with the commutated coil is due to two coils; that is, twice that in the latter case. Fractional pitch windings, however, have the disadvantage of reducing the width of the neutral zone, or zone without induced E.M.F. between the ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1902 Excerpt: ...lie in separate slots. Thus, in the former case the flux of self-induction interlinked with the commutated coil is due to two coils; that is, twice that in the latter case. Fractional pitch windings, however, have the disadvantage of reducing the width of the neutral zone, or zone without induced E.M.F. between the poles, in which commutation takes place, since the one side of the coil enters or leaves the field before the other. Therefore, in commutating machines it is seldom that a pitch is used that falls short of full pitch by more than one or two teeth, while in induction machines, occasionally as low a pitch as 50 % is used, and pitch is frequently employed. Series windings find their foremost application in machines with small currents, or small machines in which it is desirable to have as few circuits as possible in multiple, and in machines in which it is desirable to use only two sets of brushes, as in railway motors. In multipolar machines with many sets of brushes, series winding is liable to give selective commutation; that is, the current docs not divide evenly between the sets of brushes of equal polarity. Multiple windings are used for machines of large currents, thus generally for large machines, and in large lowvoltage machines the still greater subdivision of circuits afforded by the multiple spiral and the multiple reentrant winding is resorted to. To resume, then, armature windings can be subdivided into: a). Ring and drum windings. b). Closed circuit and open circuit windings. Only the former can be used for commutating machines. e). Multiple and series windings. d). Single spiral, multiple spiral, and multiple reentrant windings. Either of these can be multiple or series windings. e). Full pitch and fractional pitch windings. III. Ind...
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