I have a problem of my simulink model. PLEASE HELP ME T.T

First im not good at English forgice me.

this is my model when i try an open loop system, it works but when i try closed loop system (feedback) , it doesnt work.

that is an error i cant undersand the error. as i think eq1 has too high degree. is that right? or other reason?

[Kyu Hong Lee]

SORRY IT'S TOO SMALL. THIS IS AN ERROR

An error occurred while running the simulation and the simulation was terminated Caused by: Simulink cannot solve the algebraic loop containing 'ed713/Gain2' at time 1.0 using the TrustRegion-based algorithm due to one of the following reasons: the model is ill-defined i.e., the system equations do not have a solution; or the nonlinear equation solver failed to converge due to numerical issues. To rule out solver convergence as the cause of this error, either a) switch to LineSearch-based algorithm using set_param('ed713','AlgebraicLoopSolver','LineSearch') b) reducing the ode45 solver RelTol parameter so that the solver takes smaller time steps. If the error persists in spite of the above changes, then the model is likely ill-defined and requires modification. Component:Simulink | Category:Blockerror

Answer 1

[JuanCa]

In the signal that closes the loop you need to add a Unit Delay block or a Memory block