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I could make it work. Thank you
It was a bad understanding of connectors. You can't have connection inside a model. The working model below:
Code:
model Motor_simple
Rotor1 Rot;
Stator1 Stat;
Friction1 F1;
Friction1 F2;
Speed w;
Angle theta;
initial equation
der(w) = 0;
//steadystate
equation
Rot.c.theta - Stat.c.theta = theta;
w = der(theta);
connect(Rot.c,F1.c);
connect(Stat.c,F2.c);
end Motor_simple;
I did others model and I have always the same issue using connector type Flange, flattening of the model add an equation xxx.tau=0.0 even if I try to impose another equation.
I am stuck on this problem and I would really appreciate some help
Hi,
Can somebody of the community help me with an issue I have with a simple motor model.
When I instantiate the model with OMEdit, it forces torque equation to zero. This issue rise only when I use connectors.
Many thanks.
David
Rotor.tau = 0.0;//?
Stator.tau = 0.0;//?
The resulting failure is that I end with too much equations. Below is the full model and the instantiated model.
Model as written:
Flange Rotor;
Flange Stator;
Flange Friction1;
Flange Friction2;
//Torque tau;
Speed w;
Angle theta;
Current i;
//parameter Real Mf = 0;
parameter Real V = 10;
parameter Real K = 0.014;
parameter Real J = 0.0000001;
parameter Real R = 10;
initial equation
der(w) = 0;
//steadystate
equation
Rotor.theta - Stator.theta = theta;
w = der(theta);
K * i + J * der(w) = Rotor.tau;
V = R * i + K * w;
Friction1.tau = 0;
Friction2.tau = 0;
connect(Rotor,Friction1);
connect(Stator,Friction2);
Stator.theta = 0;
end Motor_simple;
Real Rotor.theta(unit = "rad");
Real Rotor.tau(unit = "Nm");
Real Stator.theta(unit = "rad");
Real Stator.tau(unit = "Nm");
Real Friction1.theta(unit = "rad");
Real Friction1.tau(unit = "Nm");
Real Friction2.theta(unit = "rad");
Real Friction2.tau(unit = "Nm");
Real w(unit = "rad/s");
Real theta(unit = "rad");
Real i(unit = "A");
parameter Real V = 10.0;
parameter Real K = 0.014;
parameter Real J = 0.0000001;
parameter Real R = 10.0;
initial equation
der(w) = 0.0; //steady state
equation
Rotor.theta - Stator.theta = theta;
w = der(theta);
K * i + J * der(w) = Rotor.tau;
V = R * i + K * w;
Friction1.tau = 0.0;//?
Friction2.tau = 0.0;//?
Stator.theta = 0.0;
Rotor.tau = 0.0;//?
Stator.tau = 0.0;//?
Friction1.tau = 0.0;
Friction2.tau = 0.0;
(-Rotor.tau) + (-Friction1.tau) = 0.0;
Friction1.theta = Rotor.theta;
(-Stator.tau) + (-Friction2.tau) = 0.0;
Friction2.theta = Stator.theta;
end mypackage.Motor_simple;
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