TransactionsPublished under the care of the General Secretary and the Treasurer . y a series of experiments carefully carried out, andits application lias given excellent results in the calculation of all gap tiuxes. ADAMS: LEAKAGE REACTANCE OF INDUCTION MOTORS. 711 Lealcage, According to the familiar method of analysis, the primarycurrent of an induction motor may be looked upon as madeup of two partSj one the exciting current, and the other theload current whose just balances that of the secondarycurrent. Thus the primary load current is in general equaland opposite in pha
TransactionsPublished under the care of the General Secretary and the Treasurer . y a series of experiments carefully carried out, andits application lias given excellent results in the calculation of all gap tiuxes. ADAMS: LEAKAGE REACTANCE OF INDUCTION MOTORS. 711 Lealcage, According to the familiar method of analysis, the primarycurrent of an induction motor may be looked upon as madeup of two partSj one the exciting current, and the other theload current whose just balances that of the secondarycurrent. Thus the primary load current is in general equaland opposite in phase to the secondary current; but considerthe moment when a primary phase belt bridges the joint betweentwo secondary phase belts, see Figs. 3, 4, 5 and 6. The primaryload current has a phase in between those of the two overlappingsecondary currents, and there result local as indicated inFigs. 3, 4, and 5. The corresponding fluxes have components inphase with each of the currents with which they are linked andthese components have the same effect as true leakage t* A-2 +^---B2— Figs. 3, 4, and 5. In order to simplify matters for the time being, consider a three-phase machine with a great many very small teeth and iV con-ductors per era of periphery in primary and in secondary. Con-sider the instant represented in Figs. 6 and 7. The vectors^1, J5i, B.,. etc., of Fig. 7, represent the currents in the correspond-ing phase belts of Fig. 6. The exciting current is neglected asexplained above. Consider the overlap of belt A^ on B^- Then, for every amperein the primary circuit there will be a resultant belt leakage cur-rent, a^ (Fig. 7 )= 2 sin- /- • \ which will produce a leakage flux in phase with A^. The corresponding total flux linkage forthat part of the A^ belt which overlaps the B, belt, is obtained byan obvious integration. It is (for 1 cm depth of core),. ^ KK, N^\ . „ /- ^? — y\ 712 ADAMS: LEAKAGE REACTANCE OF INDUCTION MOTORS. where ^ is the air
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