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28 01 11 s

Study material for Principi di Ingegneria Elettrica, shared by the Studwiz community and reviewed by moderators.

Principi di Ingegneria ElettricaFull exam

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Study material for Principi di Ingegneria Elettrica, shared by the Studwiz community and reviewed by moderators.

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Ese1%%Le% auto% induttanze% e% la% mutua% sono% pari% a% L1=N1^2/(2*tetad),% L2=N2^2/(2*tetad),% Lm=%N1*N2/(2*tetad),% con% tetad=δ/(muo*Afe).% % La% corrente% Ib=I2% (la% resistenza% R4% è% in% parallelo%ad% un% corto% circuito),% per% il% calcolo% della% corrente% Ia% si% trova% con% millman%Vmillman=(V1/R1)/(1/R1+1/R2+1/R3)% e% Ib=Vmillman/R3.% L’energia% è% pari% a%W=1/2*L1*Ia^2+1/2*L2*Ib^2+Lm*Ia*Ib.% Per% il% calcolo% della% forza% bisogna% calcolare% i% flussi%nei%traferri.%Tale%flusso%è%pari%a%fi=(N1*Ia+N2*Ib)/(2*tetad),%si%trova%f=(2*fi2)/(2*muo*Afe).%%Ese2%%Detto% O’% il% centro% stella% di% destra% e% O’’% quello% % in% basso% si% ha%VO’O=(E1/Z1+E2/Z2+E3/Z3)/(1/Z1+1/Z2+1/Z3)% con% Z1=R,% Z2=jXl,% Z3=UjXc.% La% corrente%Ir_fase1=(E1UVO’O)/(R).% VO’’O=E3,% quindi% la% corrente% Ir_fase1_veritcale=(E1UE3)/R.% Iw=%Ir_fase1+%Ir_fase1_veritcale% e% Vw=E1UE2.% La% potenza% del% wattmetro% è% pari% a%Pw=Re(Vw*conj(Iw)).%%Ese3%In% t% zero% meno% il% condensatore% è% un% circuito% aperto% e% l’interruttore% è% chiuso,% la% tensione% sul%condensatore% è% pari% a% quella% su% R4% e% su% R1,% vc_zerom=I1*(R1*R4)/(R1+R4),%la% corrente%ic_zerom=0%A.%in%t%zerop%l’interruttore%è%aperto%e%il%condensatore%è%sostituito%da%un%generatore%di% tensione% pari% a% vc_zerom% diretto% verso% l’alto,% la% corrente% è% data% dalla%legge% alla% maglia% di%destra% ic_zerop=Uvc_zerom/(R4+(R2*R3)/(R2+R3)).%In% t%inf% % l’interruttore% è% aperto% e% il%condensatore%è%un%circuito%aperto%quindi%ic_inf=0%A% TEMA A 1) I1 = 10 %corrente avv. 1 I2 = 5 % corrente avv. 2 Rm = 2.6526e+006 % riluttanza traferro L1 = 0.0019 % autoinduttanza 1 L2 = 0.0075 % autoinduttanza 2 Lm = 0.0038 % mutua ind. p = 3.7699e-004 % flusso circuito complessivo F = 188.4956 % forza totale traferri 2) E1 = 220; E2 =…

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