I think that the solution is to make a new record for model.
I made a record, but the problem is that my class doesn’t recognize the parameters from the record. For example when I put this code into the record file, my model wouldn’t find it:

record AIMC_record

parameter Modelica.SIunits.Inertia Jr = 0.29 "Rotor's moment of inertia";

annotation…

end AIMC_record;

Anyone who worked with this? Any tips?
Thanks a lot,
Lala : )

P.S. Name of the class is aimc_class.mo

I already found a solution how to solve this task. But maybe some new users will have the same problem, so that’s why I will try to explain that in this section.
In the very beginning of the class formulation, just define the parametres that You are going to use in the class. Definition will look something like this (this is for inspiration only):

final parameter Integer m = 3 "Some number";

parameter Modelica.SIunits.Inertia Jr = 0.29 "Inertia";

parameter Integer p(min = 1) = 2 "Number of pole pairs";

parameter Modelica.SIunits.Frequency fsNominal = 50 "Frequency";

parameter Modelica.SIunits.Inductance Lm = 0.00922531 "Inductance" annotation(Dialog(tab = "New tab"));

I think that You are going to understand this code when You use it. Variables are defined trough path Modelica/SIunits. Section “annotation(Dialog(tab = "New tab"));” defines the new tab (not “General” tab) for the model.
I hope so that this will help to someone.
Cheers,
Lala : )