How i can write an equation in SIMSCAPE script which is dependent on the output of that component?

Question

MD. SHAHRIAR JAHAN 2013-2-10

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/62882-how-i-can-write-an-equation-in-simscape-script-which-is-dependent-on-the-output-of-that-component

编辑： Walter Roberson 2024-12-14

For example, I want to make a mutual inductor where mutual inductance M is a function of output current i1. How i can write that. Can anybody help me regarding this?

I would be really grateful for it.

Thanks Shahriar ============================================================================= For your referrence : The code is written below =============================================================================

component mutual_inductor_paper
nodes
  p1 = foundation.electrical.electrical; % +:left
  n1 = foundation.electrical.electrical; % -:left
  p2 = foundation.electrical.electrical; % +:right
  n2 = foundation.electrical.electrical; % -:right
end
parameters
  L1 = { 1, 'H' };  % Toroidal inductance
  L2 = { 2, 'H' };  % Poloidal inductance
  pip = { 1, 'W' };  
  tim = { 1, 's' };  
  i10 = { 0, 'A' };  % Winding 1 initial current
  i20 = { 0, 'A' };  % Winding 2 initial current
end
variables
  i1 = { 0, 'A' };
  v1 = { 0, 'V' };
  i2 = { 0, 'A' };
  v2 = { 0, 'V' };
end
function setup
  through( i1, p1.i, n1.i );
  across( v1, p1.v, n1.v );
  through( i2, p2.i, n2.i );
  across( v2, p2.v, n2.v );
    i1 = i10; % Initialize current for winding 1
    i2 = i20; % Initialize current for winding 2
  end
equations
    let
          M = pip*time/(i1*^2)
      in
    v1 == L1*i1.der + M*i2.der;
    v2 == L2*i2.der + M*i1.der;
  end
  end
end

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Ryan G 2013-2-11

Is it possible to write the equation you want to implement? Does this code work for you currently (minus the feature you are asking about)?

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Answer 1

Sabin 2024-12-14

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/62882-how-i-can-write-an-equation-in-simscape-script-which-is-dependent-on-the-output-of-that-component#answer_1555746

Simulink is a signal-based or input-output and works well for control design. Physical systems are often expressed in the form of DAEs, which are composed of sets of equations that must be solved simultaneously. Therefore, we don’t think in terms of inputs and outputs anymore.

A good starting point in understanding Simscape language is the Simscape documentation:

https://www.mathworks.com/help/simscape/get-started-with-simscape-language.html

If you’re looking for a custom implementation of an inductor (both linear and nonlinear) check this example where the Simscape source code is open:

https://www.mathworks.com/help/sps/ug/custom-inductor-b-h-curve.html