By Rudolf Zwicky; International Federation of Automatic Control; Symposium on Control in Power Electronics and Electrical Drives
Includes ninety seven papers which offer a invaluable evaluate of the newest technical ideas during this speedily increasing box. parts of improvement which obtain specific consciousness contain the emergence of energy switching transistors, the appliance of microprocessors to legislation and keep an eye on of static converters and electric drives, using extra subtle keep an eye on options and the usage of strength electronics in new software fields.
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Extra resources for Control in power electronics and electrical drives : proceedings of the 3. IFAC Symposium, Lausanne, 12 - 14 Sept. 1983
I f fz fa l l s bel ow a fi xed mi n i mum va l u e , the observer rou t i ne therefore mu s t be su spended h o l d i n g the l as t estima ted v a l u e res p . tha t of the temperature of the cool i ng med i um after a l on ge r per i od of no- l oa d . Wi th respec t to the non- l i neari t i e s the observer a l gori thm con s i sts i n a nu mer i c a l sol uti on of eqn . ( 1 5 ) and ( 1 6 ) . Hence fol l ows that the sta te of saturati on mu s t be ta ken i nto e stima t i on but i t shou l d be noted that therma l time con stants a re much l a rger than e l ectri cal ones and thus rema i n s t i me e nough for m i c rocompu ters ca l c u l at i on .
It s h ou l d be noted that there are no s i gn i f i ca n t d i fferences in the torque rotor-frequency curves when speed var i e s s i nce t h e re l a t i ve d i mi n u t i on o f torque cau s e d by space ha rmon i c s i s very sma l l . However the rotor frequency of opt i ma l effi c i ency marked by severa l symbol s ( F i g . 8 ) i s con s i de ra b l y i nfl uenced by a dd i t i on a l l osses , the i r n eg l ec t i on wou l d d i s p l ace the opti mum so that the motor operates wi th a h i gher flux res p .
I E EE-Trans . PAS , 1 02 , 38-46 . 4 Ec h tler, � Mi s tschenko , W . and Serg l , J . ( 1 974 ) . Betr i eb e i nes Async hronmotors mi t opt i ma l er Spannungs- u n d Frequenzrege l ung b e i k on s tanter Verl u s tsumme . Bu l l ASE/UCS ( Sw i tzerl and ) , 6 5 , 1 6 2- 1 7 1 . 5 Green , R . M . and Boy"S:" J . T . ( 1 982 ) . I n verter AC- d r i ve eff i c i ency . 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 .