TransactionsPublished under the care of the General Secretary and the Treasurer . few of the later commutators will be mentioned in the following: 19. Commutator for the Transformation of a PolyphaseCurrent into a Direct Current or into a Polyphase Cue-rent of Lower Frequency, According to the HeylandMethod. a). Commutator for synchronous machines. In order to make a polyphase machine self-exciting, or to com-pound it, the polyphase current must be converted into directVol. 1 — 55 866 ARNOLD AND LA COUR: COMMUTATION. current. This may be effected by means of a commutator. Sucha commutator as w
TransactionsPublished under the care of the General Secretary and the Treasurer . few of the later commutators will be mentioned in the following: 19. Commutator for the Transformation of a PolyphaseCurrent into a Direct Current or into a Polyphase Cue-rent of Lower Frequency, According to the HeylandMethod. a). Commutator for synchronous machines. In order to make a polyphase machine self-exciting, or to com-pound it, the polyphase current must be converted into directVol. 1 — 55 866 ARNOLD AND LA COUR: COMMUTATION. current. This may be effected by means of a commutator. Sucha commutator as was proposed in 1903 by A. Heyland is repre-sented in Fig. 56. The magnetic winding GF of the generatoris divided into four parts, which are wound parallel on the samemagnet core. Fig. 56a, in order to obtain a large mutual induc-tion of the separate branches. The separate parts, as the figureshows, are electrically connected with each other at several connections serve to balance the currents and the voltageswhich are produced in the commutation of the Fig. 56. Connections of Heyland Commutator for Self-Excitation ofA Six-Pole Synchronous Machine. The commutator has six segments per pole, of which four areconnected with the four branches of the field winding, while theother two laminations remain without conuection and serve onlyas insulation between the current-bearing laminations of twoneighboring poles. The current-bearing laminations which lieat a distance from each other of twice the pole pitch in thecommutator, receive always the same potential and, therefore,need not be connected by inner cross-connections in the commu-tator. In this way it is possible to get along with one brush perphase and to set the brushes on any pair of poles at will. Thus,a better distribution of the brushes on the surface of the arma-ture is effected so that they can be more easily applied. In the ARNOLD AXD LA COUR: COMMUTATION. 867 commaitator, Fig. 56, the brushes I an
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