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Solving coupled ode in matlab help

  1. May 3, 2012 #1
    Problem: Model the coupled ode system for a motor:

    I have been given the values of L=1e-3, R=50, Is=10.0A and C is to be designed by trial and error.
    I have been able to write out the function, by assigning Vc=x(1) and Il=x(2), and then I wrote dxdt= [dVc/dt;dIl/dt];

    But when I have my script, I'm having trouble in how to define the initial conditions. The task says that all currents and voltages are zero at the beginning and I have therefore written that x1=0 and x2=0.

    However, when I plot the result, the current value is way lower than what is expected.
    I suspect there is a problem in the way I am defining the initial conditions.
    Any help would be greatly appreciated.
  2. jcsd
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