Work with Symbolic Math Toolbox with units and export data to Simulink´s models parameters
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Dear,
I am working with the Symbolic Math Toolbox with units. I would like to pass the results of the calculations as parameters for Simulink models and I cannot find the form. It seems that I have to use the "double" function but I don't know if it is correct when the symbolic variable has units. What would be the correct procedure?
fRed = 50;
Vpk = 1;
R_serie = 10;
u = symunit;
syms Lm Ac mu0 Reluc_AG Reluc_Nucleo L_AG L_HV L_LV
syms Reluc(L,Sec,mu_rel) L_ind(Nvueltas,Reluctancia)
mu0 = 4*pi*1e-7 * (u.Wb / (u.m * u.Ampere));
vpa(mu0,5)
%Definición de la función de la reluctancia
Reluc(L,Sec,mu_rel) = L / (mu0 * mu_rel * Sec)
%Definición de la función de la inductancia
L_ind(Nvueltas,Reluctancia) = Nvueltas^2/Reluctancia
L_AG = 0.5*u.mm; % Largo del entrehierro
vpa(L_AG,5)
Lm = 29.8*u.cm; % Largo promedio del núcleo magnético
vpa(Lm,5)
Ac = 7.8*u.cm^2; % Sección del núcleo
vpa(Ac,5)
N_HV = 75; % Número de vueltas del lado HV
N_LV = 240; % Número de vueltas del lado LV
mu_r = 16600; % permebilidad relativa del núcleo AMCC-200. Dato extraído del Informe Final v2.
%Reluctancia del entrehierro
Reluc_AG = vpa(simplify(Reluc(L_AG, Ac, 1)),10)
%Reluctancia del núcleo
Reluc_Nucleo = vpa(simplify(Reluc(Lm, Ac, mu_r)),10)
%Reluctancia total. Dos veces la reluctancia del entrehierro más la reluctancia del núcleo.
Reluc_Total = vpa(2*Reluc_AG + Reluc_Nucleo,10)
%Inductancia del bobinado HV solo en el núcleo
L_HV = vpa(L_ind(N_HV,Reluc_Total),10);
L_HV = vpa(unitConvert(L_HV,u.mH),5)
%Inductancia del bobinado LV solo en el núcleo
L_LV = vpa(L_ind(N_LV,Reluc_Total),10);
L_LV = vpa(unitConvert(L_LV,u.mH),5)
L_LV_dato = double(L_LV)->ERROR
Thank you very much
Greetings
Juan
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채택된 답변
Ameer Hamza
2020년 10월 4일
As the error message also mentions, you need to use separateUnits before converting it to double
L_LV_dato = double(separateUnits(L_LV))
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