TransactionsPublished under the care of the General Secretary and the Treasurer . Tnmetrical wave-winding, it is desirable to install equi-potentialconnections, because they remove any want of symmetry in thedifferent fields and commutating zones. All multifold multiplewave-windings are symmetrical, as well as all single wave-windingsin which the number of poles is divisible by the number of thebranches of the armature currents g). In all machines the number of commutator segments K ispreferably such as is not divisible by the number of poles, because. Fig. 44. Aekangement of Field With Deri C
TransactionsPublished under the care of the General Secretary and the Treasurer . Tnmetrical wave-winding, it is desirable to install equi-potentialconnections, because they remove any want of symmetry in thedifferent fields and commutating zones. All multifold multiplewave-windings are symmetrical, as well as all single wave-windingsin which the number of poles is divisible by the number of thebranches of the armature currents g). In all machines the number of commutator segments K ispreferably such as is not divisible by the number of poles, because. Fig. 44. Aekangement of Field With Deri CoMPENSATioirWinding. then two coil sides per slot do not simultaneously leave the short circuit. If — is a whole number, as must be the case with parallel2p armatures having equi-potential connections, the simultaneous exitof two coil sides from short circuit may be avoided by displacingevery second brush a trifle in the direction of the rotation of thecommutator. II. 13. The Single-Phase Convertee. With the assumption of a sine-shaped field curve, the potentialcurve of the commutator of a single-phase converter with noload is a sine curve whose vertex coincides with the neutral zonebetween the poles. With load this potential curve persists almost un-altered, because the of the watt current and of the generateddirect current work against each other, so that no cross-field is 7. See E. Arnold, Die Gleichstrom Maschine. Bd, I, Seite 60. ARNOLD AND LA COUR: COMMUTATION. 849 produced. Under the brushes, which stand at the vertices of thepo
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