. The Street railway journal . the starting torque is doubledfor the same current and same commutation as would beobtained with a compensated series motor. The electrical connections shown in Fig. 3 are repro-duced in Fig. 6, which indicates also the magnetic rela-tions. The circuits of Fig. 7 are electrically and magneti-cally equivalent to those of Fig. 3. The performance char-acteristics of the motor of Fig. 7 are similar to those of a compensated single-phase motor, but the action throughoutthe commutation zone is quite different. In the motor ofb^ig. 7 the flux along the brush axis depend
. The Street railway journal . the starting torque is doubledfor the same current and same commutation as would beobtained with a compensated series motor. The electrical connections shown in Fig. 3 are repro-duced in Fig. 6, which indicates also the magnetic rela-tions. The circuits of Fig. 7 are electrically and magneti-cally equivalent to those of Fig. 3. The performance char-acteristics of the motor of Fig. 7 are similar to those of a compensated single-phase motor, but the action throughoutthe commutation zone is quite different. In the motor ofb^ig. 7 the flux along the brush axis depends solely upon thee. m. f., Es, and is unaffected in any way by the current inthe armature. The current in the compensating and com-nmtating winding is a dependent variable, having a valuesuch as not only to oppose the magnetomotive force of thearmature current, but also to supply the m. m. f. to producethe flux demanded by the e. m. f. Es. The cutting of thisflux by tlie armature conductors under running conditions. FIGS. I AND 5.—EQUIVALENT OF CIRCUITS SHOWN INFIGS. 1 AND 2 generates in the armature coil under the brush a speede. m. f. that neutralizes the transformer e. m. f. producedin this coil by the alternating field flux. It is interesting to examine the required value and time-phase position of the commutating flux. The transformere. m. f. of the field flux varies in value solely with thefield strength, and is always in time-quadrature therewith;it is unaffected by the speed except to the extent that the
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
