The included model DamperBug1 leads to the following error:

Unbekannter Fehler warning | division by zero in partial equation: ((-$ZERO.$DER.springdamper3.flange_b.phi) * idealrollingwheel2.radius) / (idealrollingwheel2.radius - idealrollingwheel1.radius) because idealrollingwheel2.radius - idealrollingwheel1.radius == 0: File: /usr/lib/omlibrary/Modelica 3.1/Mechanics/Rotational.mo Line: 3644

        | at Time=0.000000

        | [line] 487 | [file] DamperBug1.c

throw   | [line] 45 | [file] util/division.c

        | division by zero

Changing one of the SpringDamper blocks to a Spring works (example DamperBug3).
Deleting the Wheels and staying in the rotational domain works (example DamperBug2).

    Greetings
        Peter

model DamperBug1
  Modelica.Mechanics.Rotational.Sources.ConstantTorque constanttorque1(tau_constant = 100);
  Modelica.Mechanics.Rotational.Components.Inertia inertia1(J = 0.6, w(start = 83.7758, fixed = true), phi(start = 0.0, fixed = true));
  Modelica.Mechanics.Rotational.Components.SpringDamper springdamper3(c = 7500, d = 1);
  Modelica.Mechanics.Rotational.Components.SpringDamper springdamper1(c = 7500, d = 1);
  Modelica.Mechanics.Rotational.Components.IdealRollingWheel idealrollingwheel1(radius = 0.3);
  Modelica.Mechanics.Rotational.Components.IdealRollingWheel idealrollingwheel2(radius = 0.3);
  Modelica.Mechanics.Translational.Components.Mass mass1(m = 1200, v(start = 0, fixed = true));
equation
  connect(idealrollingwheel2.flangeT,mass1.flange_a);
  connect(idealrollingwheel1.flangeT,mass1.flange_a);
  connect(springdamper1.flange_b,idealrollingwheel1.flangeR);
  connect(springdamper3.flange_b,idealrollingwheel2.flangeR);
  connect(springdamper3.flange_a,inertia1.flange_b);
  connect(inertia1.flange_b,springdamper1.flange_a);
  connect(constanttorque1.flange,inertia1.flange_a);
end DamperBug1;

model DamperBug2
  Modelica.Mechanics.Rotational.Sources.ConstantTorque constanttorque1(tau_constant = 100);
  Modelica.Mechanics.Rotational.Components.Inertia inertia1(J = 0.6, w(start = 83.7758, fixed = true), phi(start = 0.0, fixed = true));
  Modelica.Mechanics.Rotational.Components.SpringDamper springdamper3(c = 7500, d = 1);
  Modelica.Mechanics.Rotational.Components.SpringDamper springdamper1(c = 7500, d = 1);
  Modelica.Mechanics.Rotational.Components.Inertia inertia2(J = 2, w(start = 0, fixed = true));
equation
  connect(springdamper3.flange_b,inertia2.flange_a);
  connect(springdamper1.flange_b,inertia2.flange_a);
  connect(springdamper3.flange_a,inertia1.flange_b);
  connect(inertia1.flange_b,springdamper1.flange_a);
  connect(constanttorque1.flange,inertia1.flange_a);
end DamperBug2;

model DamperBug3
  Modelica.Mechanics.Rotational.Sources.ConstantTorque constanttorque1(tau_constant = 100);
  Modelica.Mechanics.Rotational.Components.Inertia inertia1(J = 0.6, w(start = 83.7758, fixed = true), phi(start = 0.0, fixed = true));
  Modelica.Mechanics.Rotational.Components.SpringDamper springdamper3(c = 7500, d = 1);
  Modelica.Mechanics.Rotational.Components.IdealRollingWheel idealrollingwheel1(radius = 0.3);
  Modelica.Mechanics.Rotational.Components.IdealRollingWheel idealrollingwheel2(radius = 0.3);
  Modelica.Mechanics.Translational.Components.Mass mass1(m = 1200, v(start = 0, fixed = true));
  Modelica.Mechanics.Rotational.Components.Spring spring1(c = 7500);
equation
  connect(spring1.flange_b,idealrollingwheel1.flangeR);
  connect(spring1.flange_a,inertia1.flange_b);
  connect(idealrollingwheel2.flangeT,mass1.flange_a);
  connect(idealrollingwheel1.flangeT,mass1.flange_a);
  connect(springdamper3.flange_b,idealrollingwheel2.flangeR);
  connect(springdamper3.flange_a,inertia1.flange_b);
  connect(constanttorque1.flange,inertia1.flange_a);
end DamperBug3;