. Practical physics. A four-pole direct-currentgenerator DYNAMOS 301. Fig. 311 illustrates nicely the method of winding such an armature, each coilbeginning on one segment of the commutator and ending on theadjacent segment. 357. Dynamo lighting circuit. Thetype of circuit generally used incandescent lighting is shownin Fig. 318. The lamps are arrangedin parallel between the mains. Thefield magnets are excited partly bya few series turns which carry the whole current going to the lamps, and partly by a shunt coil consistingof many turns of fine wire (Fig. 318). This combination
. Practical physics. A four-pole direct-currentgenerator DYNAMOS 301. Fig. 311 illustrates nicely the method of winding such an armature, each coilbeginning on one segment of the commutator and ending on theadjacent segment. 357. Dynamo lighting circuit. Thetype of circuit generally used incandescent lighting is shownin Fig. 318. The lamps are arrangedin parallel between the mains. Thefield magnets are excited partly bya few series turns which carry the whole current going to the lamps, and partly by a shunt coil consistingof many turns of fine wire (Fig. 318). This combination of series andshunt winding maintains the across themains constant for a great range of a machine is called a compound u-ounddynamo, to distinguish it from a scries woundmachine, for example, which dispenses withthe shunt coil. In all self-exciting machines there isenough residual magnetism left in the ironcores after stopping to start feeble inducedcurrents when started up again. These cur-rents immediately increase the strength of themagnetic field, and so
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphysics, bookyear1922
