File:Electrical ignition (1916) (14579696557).jpg

Identifier: electricaligniti00kawa (find matches)
Title: Electrical ignition
Year: 1916 (1910s)
Authors: Kawamoto, Tane
Subjects: Internal combustion engines Spark ignition engines Spark plugs Theses
Publisher:
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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o beexpressed in a function of lz, Irom the equation (A), the re-sistance across the plug points is rs = ( e. + jfej (8) Graph 2 shows the roughly approximated values of e and >5 forvarious values of the current in which eo is taken as 500volts and K equal to 11.25. The gap length being 1 mm. Prom graph 2 and the oscillograph it is evident thatthe increase of apparent spark gap resistance is so great, theflow of secondary current ceases abruptly. And this suddenchange of the spark current induces in the primary coil afurther disturbance producing an oscillatory current which isdamped out very quickly. The magnified view of this dampedoscillation is clearly seen in the condenser current. Pigs.12 and 13. Pigs. 15, 16, and 17 are the oscillograms of similartransient currents of Splitdorf low-tension unit operating atthe speeds of 800, 1400, and 2000 R.P.M. respectively. Higherthe speed the spark current becomes less uniform which is dueto the early interruption of the growing current.
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hi 20 Chapter IV Open and short circuit characteristicsof the Ijlagneto Generator The characteristics of a magneto generator may bedivided into open circuit characteristic, short circuit char-acteristic, and the combination of above two constitutes op-erating or performance characteristic. The open circuit characteristic of any magneto1 in-cludes flux distribution in the air gap and the e.m.f. gener-ated. The flux distribution wave of the machine of this typeis naturally a flat top consequently the e.m.f. wave is high-ly peaked form. Fig. 20, 21, and 22 are oscillograms of opencircuit e.m.f. waves of Splitdorf low-tension, Dixie high-tension, and Bosch high-tension respectively. Analysis ofSplitdorf low-tension e.m.f. wave is given in the tables 2-ato 2-d which shows e.m.f. wave contains appreciable harmonicsas high as 11th. The subsequent analyses show that 33rdharmonic has the maximum value of nearly .03 volts that issomewhere near one-third percent of the fundamental wave. The grap

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