Discussion Forum

Hi Everyone,
I have a transient model of a electordynamic wheel. I am trying to export it into the simulink. I am trying to pass the simulink time into the Comsol Subsystem to get the transient solution. I have defined the constants as:
fem.const = {'vel',50, ...
'airgap','0.01',...
'wm','100',...
'time','0.1'};


fem.sol=femtime(fem, ...
'solcomp',{'u','Az'}, ...
'outcomp',{'u','Az'}, ...
'tlist',linspace(0,time,1),...
'tsteps','strict',...
'atol',1e-2,...
'rtol',5e-2, ...
'tout','tlist');

% Save current fem structure for restart purposes
nS=length(timeValues);
Fx=((4*pi*10^-7)^-1)*postint(fem,'real(Azy)*real(-Azx)','dl',[6],'edim',1,'solnum',nS)*width
Fy=0.5*((4*pi*10^-7)^-1)*postint(fem,'(real(-Azx).^2-real(Azy).^2)','dl',[6],'edim',1,'solnum',nS)*width

This command will give me the solution at time=0.1 sec. Now, I export this fem to simulink.

Dim_struct = femsim(fem,'input',{'airgap','wm','vel','time'}, ...
'output',{{'Fx' [0 0]'},{'Fy' [0 0]'}},...
'outnames',{'Fx1','Fy1'}, 'static','on')

I did not get the transient solution. I always get the same value of Fx and Fy. Can anyone suggest me what is wrong? Or do you have any idea how to export the transient problem into simulink.
I went throught two example in comsol manual. Magnetic break and Temperature control. One of the problem is using the subdomain integration and other is using the point integration. But my problem is a boundary integration. There is no such option in simulink export for boundary integration.

Thank you.
~N.Paudel