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From: Christian Eisele on 1 Apr 2010 09:39
I am stuck on creating a simple DC-Motor in Simscape language. My code so far looks like this:

component DC_mot
% DC Motor

inputs
U = { 0, 'V' }; % n:left
end

nodes
r = foundation.mechanical.rotational.rotational;; % r:right
end

parameters
ke = { 0.544, 'V*s/rad' };
km = { 0.544, 'N*m/A' };
L = { 9.5e-3, 'H' };
J = { 4-3, 'kg*m^2' };
R = { 4, 'Ohm' };
end

variables
i = { 0, 'A' };
Me = { 0, 'N*m' };
U_ind = { 0, 'V' };
phi_p = { 0, 'rad/s' };
phi = { 0, 'rad' };
n = { 0, 'rad/s' };
end


function setup
across( phi_p, r.phi_p, []);
through( Me, r.Me,[]);
end

equations
U == i*R + L*i.der + U_ind;
U_ind == phi*ke;
Me == km*i;
J*phi_p.der == Me;
phi.der == phi_p;
end

I generate my Voltage source viag a sps + constant block and use this as the input for my model.
When I then try to create the node and the through and across variables for the motor I get an error message ??No appropriate method, property, or field phi_p for class NetworkEngine.TerminalCompileData??

Any ideas what I did wrong?

Thanks!
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