Wiring diagrams of electrical apparatus and installations (1913)
McGraw-Hill · New York, McGraw-Hill Book Company · leaf 126
Fig. 189.—Single-phase series motor withcompensated armature. Fig. 190.—Tap method of control forsingle-phase series motors. The voltageacross the motors is varied by connecting totaps brought out from an auto-transformer.. … Fig. 191.—Tap control of single-phase series motors, using preventive coils. The preven-tive coils eliminate sparking at the transformer taps and prevent the short-circuiting of leadsincluded between two adjacent taps. The operation of these coils is explained in the section onrailway equipment,…
Electric wiring
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