. Practical wireless telegraphy; a complete text book for students of radio communication . creases. A diagram of a series wound generator appears in Fig. 26. The field magnetsof this type are wound with a few turns of thick wire joined in series with the . armature brushes and all of the cur-rent generated by the armature passesthrough the coils of the field magnetto the external circuit. The current inpassing through the windings of thefield magnet, energizes them andstrengthens the weak field due to theresidual magnetism of the cores whichresults in a gradual building up of themagnetic fiel
. Practical wireless telegraphy; a complete text book for students of radio communication . creases. A diagram of a series wound generator appears in Fig. 26. The field magnetsof this type are wound with a few turns of thick wire joined in series with the . armature brushes and all of the cur-rent generated by the armature passesthrough the coils of the field magnetto the external circuit. The current inpassing through the windings of thefield magnet, energizes them andstrengthens the weak field due to theresidual magnetism of the cores whichresults in a gradual building up of themagnetic field. The important char-acteristic of this machine is its abilityto furnish current at increased voltageARMATURE as the load increases for it is clear fromprevious explanations that the greaterthe strength of the field current, thegreater the strength of the magneticfield from pole to pole. The strengthof the field current flowing through aseries wound generator, and thereforethe voltage across its armature is reg-ulated by cutting out turns of the fieldthrough the medium of a multi-point. Fig. 26—Circuit of Series Wound D. C. Generator. switch or as may be done in the case of any type of generator, the voltage can beregulated by variation of the speed of the armature. The compound wound dynamo combines the desirable characteristics of boththe series and shunt wound machine, and it gives a better regulation of voltageon circuits of varying load than is possible with a dynamo of either type. Asuitable diagram of connections appears in Fig. 27. The field magnets of thecompound dynamo are wound with two sets of coils, one set being connected inseries with the armature as shown at R, and another set in shunt to the armatureand external circuit as shown at V. The function of the series winding is tostrengthen the magnetic field by the current taken through the external circuit,and thus automatically sustain the voltage under variation of a load. In the case of the shunt wound dynamo
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
