Wiring diagrams of electrical apparatus and installations (1913)
McGraw-Hill · New York, McGraw-Hill Book Company · leaf 108
Fig. 152. Fig. 153. Fig. 152.—Compensated series motor with four series coils which can be connected inseries or parallel according to the series-parallel method of control. The compensating windingprevents sparking. Fig. 153.—Motor-generator speed control. The motor, m, may be of any type, gas… … Fig. 154.—Ward Leonard motor-generator speed control. The speed is controlled byregulating the field strength of the generator, G. The motor is reversed by reversing thefield of the generator. All power must be supplied from the line through motor m.
Electric wiring
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