Abstract:
LvCr. a., Lt. t nai orrm!Lr .ssisted the sin,l.c aru .LultiphaSL bysteu. to victory in its competition
with the d. c. sy st for tine tr•ansaiis;aioi of el.cctri
c~.l cr<<.rf y tC at distances, o ham the competitia
bettr~.cr, tL.c sir b1 e phase system and the polyphase sy t LLQ u . ~.r_ d eC ded in favour of tric lattL by the po1yj,e.asc ir.cuction motor. The c.ete rminin6 factors were (1) low first cost (2) good efficiency (3) sic,x-plc sittLnaarice and (~) great reliability in service,
i sL extension of cJcctric l transmission has leu to a great yearly demand for polyphase induction motor L>. In view of these circumstances, it is rea: i ly unc :rstood that every improvem€nt in construction ox in th.e underlying characteristics of the motor mu be oi coi1sideraolc economic significance
