. Electrical ignition. Z{N^<o -±— .£7 o For the primary circuit and For the secondary circuit. rJhe solutions of these equationsare to be found in appendix A. Fig. 26 is an oscillogram of the primary coil and con-denser currents with the secondary- open. Fig. 27 shows theeffect of mutual inductance upon form of the primarycurrent when there is a current flowing in the secondary. 7 34 It has already been mentioned in the previous pars-graph that the transient (sudden short circuit current) ina magneto is quite different from that of an alternator, andthis transient current follows a
. Electrical ignition. Z{N^<o -±— .£7 o For the primary circuit and For the secondary circuit. rJhe solutions of these equationsare to be found in appendix A. Fig. 26 is an oscillogram of the primary coil and con-denser currents with the secondary- open. Fig. 27 shows theeffect of mutual inductance upon form of the primarycurrent when there is a current flowing in the secondary. 7 34 It has already been mentioned in the previous pars-graph that the transient (sudden short circuit current) ina magneto is quite different from that of an alternator, andthis transient current follows approximately as in an equa-tion, _ *5 Q A. — /] (: -t ^cc { P&r nn a n <2K-t) where A is constant and equal to the instantaneous value ofthe permanent short circuit current when Q - e, at whichthe switch is closed. The method of determining this con-stant is found in appendix A. Fig. 28 and 29 show the sudden short circuit currentsof the Splitdorf low-tension magneto with Q = o° and 90° 35 Table 5 Transient Sudden Short Switch is closed .5 Calculated- 1 A*, 0 .86 .581 0 20 .895 .558 .195 40 .96 .521 .364 60 .46 .483 80 .266 .372 100 .316 .554 120 .46 .966 140 .96 .521 160 .895 .558 180 .86 .581 200 .895 .558 220 .96 .521 o 240 .46 260 .316 280 .266 300 .46 320 .96 .521 340 .895 .558 360 .86 .581 Circuit Currentat e = 0°. = observed /ft * i # i Dif f x/x X X 0 0 0 .11 .18 .62 .42 .2 .53 .35 .81 10. .14 .12 . i-^o .98 .35 .93 .2 1. .31 .53 .01 .62 .65 .37 -7,86 .76 .25 .89 .18 .68 # Sudden short circuit current - i0Perman
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