Issue with locked-rotor Asynchronous Machine model

[Dietmar Winkler]

I have a very simple test based on an MSL example:

model LockedRotorTest
  extends Modelica.Electrical.Machines.Examples.AsynchronousInductionMachines.AIMC_DOL(aimc(useSupport=true));
equation 
  connect(aimc.support, aimc.flange) annotation (Line(points={{0,-50},{0,-40}}, color={0,0,0}));
end LockedRotorTest;

It's basically an electrical machine that just got its rotor locked to the support.

In Dymola simulating 1 second takes about 0.1 seconds. Trying the same in OMEdit bascially locks the machine. I've now been waiting for more than one hour and the simulation still does not finish.

Is this simply a solver setting problem or more an underlying OMC problem?

[Dietmar Winkler]

Btw, instead of locking it down one can provide a extremely slow speed on the shaft (e.g., 1e-6) and OMC behaves again.

[Adeel Asghar]

This seems to work fine both from CLI and OMEdit. Maybe you are using some special flags. Post your omeditcommunication.log file.

[Dietmar Winkler]

My example model had one important modification missing. The machine needs to be connected in star. I've attached the corrected version which will then make OMC fail.

[Adeel Asghar]

Well I get several simulation error messages but at least the simulation finished rather fast.

[Dietmar Winkler]

Yes, after I got a new nightly build again it now also simulates quite fast but with errors and wrong results.

[Adeel Asghar]

Then its up to the solver guys.

[Francesco Casella]

@dietmarw, could you provide some indication of where the results are wrong? E.g., you may attach the result file produced by Dymola with some additional comment.

[Dietmar Winkler]

With Dymola you get for currentQuasiRMSSensor.I:

for 500 and 5000 steps.

With OMC you get with 500 steps:

and with 5000 steps:

I hope this helps.

[Francesco Casella]

Releasing 1.14.0 which is stable and has many improvements w.r.t. 1.13.2. This issue is rescheduled to 1.16.0

[Francesco Casella]

Retargeted to 1.17.0 after 1.16.0 release

[Francesco Casella]

Retargeted to 1.18.0 because of 1.17.0 timed release.

[Francesco Casella]

Ticket retargeted after milestone closed