By Radio Corporation of America. Electron Tube Division
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I EE Proc . B , 1 29 , 75-8 1 . 6 Cero v s ky , Z . ( 1 97 7 ) . Di e E i genschaften des mi t veranderl i cher Frequenz u n d Spannung ge spei s ten Async hronfahrmotors fUr d i e el ek tri sche Tra k t i o n . I n 3rd Power E l ectron i cs C onference , Vol . 3 , Budape s t . 3 , 6 . 7 Sobottka , U . ( 1 96 9 ) . E i n f l u B der Temperatur a u f da s Betri ebsverh a l ten der dreh zah l ge regel ten Async h ronmasch i ne . Si emens Ze i t sch ri ft , 4 3 , 760-76 5 . and Schu l ze , H .
By observing v1 , these parameters are identified. vl r li l + wl (L l ' i l d + 1 t i 0d) q q (25) 0 ( iOd - i l ) - w T i d s O Oq ( 26-A) 0 (i Oq - i l q ) + w TO iOd s (26 -B) the o ther hand, real and reactive component of input power (P 1 , Q1 ) is represented from eq . (2 5 ) as On P l = v l di l + v lq i lq d 2 r l i l + wlL t (i l q iOd - i l di Oq ) ( 33) eq . ( 3 2 ) is wri tten as Characteris tics of induction motor at oper rating s teady s tate is represented from eqs . ( 9 ) and ( 10) as r li l - wl (L l ' i l + L i Oq ) q t d ' Y /;;, ( w11 11) ( w11 1 ) 2 a l /;;, Ql + (P l - r l i l 2 ) 2 PARAMETER IDENTIFICATION AT OPERATING STEADY STATE vld Now defining a pair o f new variab l es ( 2 7) ( 34) This al gebraic equation is satisfied at any operating s tates under a condition that iron loss is neg ligib l e .
U . s ta tor fl ux l i n kage at seve ra l l oads ( 1 500 rpm . ) In F i g . 9 the s i tuati on a t con s tant torque and speed i s g i ven . It sh ows cu rrent and p . u . stator fl ux vs . rotor frequency . It a 1 so de mon strates h ow to e stab l i sh the I 1 -f 2 control characte r i s ti c . In case of the g i ven charac teri s t i c of the test mac h i n e i t respec ts ef fi ci ency and cu rrent consump t i on cri ter i on i n the same way . ]_ . ,, for 90 86 20-c 1,0 500 0,8 LOO q6 30 : lmax I I I 100 200 300 400 l1 if,;; --,;: yields for 110"C yields soo 600 700 T/Nm F i g .