TransactionsPublished under the care of the General Secretary and the Treasurer . of the stator tooth-pitch. In eachof Figs. 9 to 12 two curves are shown for different lengths of air-gap. As both the tooth-tip and the belt reactance are emphasizedbv a short gap, the corresponding curve in each case will show moreplainly the manner of variation of these two elements, while thecurves for the longer gap will give a better idea of the actual im-portance of these elements. For the initial position (zero) the primary phase belts were setexactly opposite to those of the secondary, and the belt leakag
TransactionsPublished under the care of the General Secretary and the Treasurer . of the stator tooth-pitch. In eachof Figs. 9 to 12 two curves are shown for different lengths of air-gap. As both the tooth-tip and the belt reactance are emphasizedbv a short gap, the corresponding curve in each case will show moreplainly the manner of variation of these two elements, while thecurves for the longer gap will give a better idea of the actual im-portance of these elements. For the initial position (zero) the primary phase belts were setexactly opposite to those of the secondary, and the belt leakage is,therefore, zero. ADAMli: LEAKAGE REACT Ay CE OF INDUCTIOX MOTORS. 719 Figure 9. The difference between curve I and the broken curve shows thetooth-tip reactance; and the difference between the broken curveand the 40 ohm line shows the belt reactance. Position Zero. Both the tooth-tip and the belt leakage are zero, the reactance forthis position being made up wholly of the other two elements, whichare practically constant for all positions and air-gaps. 80 70 €0 60 40 20. Stator+l. Rotor *2. 4 Poles. Total leakage reactance at 292 Cycles. 4 partly closed slots in Stator I -gj. p^jg pgj. p^jase. 4 open slots in liotor ) Air Gap J -l* n^™- for Curve I .57 • • II and HICurve m-Stator*!. Rotor *3b. Core same as Rotor 2, but withsquirrel cage winding, the bars being so placed in the slots thatthey occupy the same position as the winding of No. 2. .2 ^ .6 .8 Rotor position in terms of tooth pitch. Fig. .5. The tooth-tip leakage has its maximum value; the belt leakage issmall not only because of the slight displacement, but also becausethe reluctance of the belt leakage path is a maximum. The peak atthis point is narrow and low, because of the oj^en slots. Position 1. The tooth-tip leakage is zero and all of the excess, over that atposition zero, is due to the belt leakage. This position is representedin Fig. 5. 720 ADAMS: LEAKAGE REACTA
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