LS Loss model

Mostafa Ahmadi

Dear Sir/madam, 

 

I have simulated a machine and used Bertotti and LS model for calculating the losses.

I can not understand why the waveform of the loss is like that, specially the negative values. I would be really thankful if you could explain the reason of this. 

 

Best regards, 

 

 

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Alejandro Rodríguez

Dear Mostafa,

There are two things that are worthwhile to notice for LS model users.

Firstly, that this is a mathematical model, made to fit with real measures. That means that the concerning of the model is to get a good global value, while values for each instant are less significant, that is why usually waveform are not very relevant.

Secondly, iron losses are positive because the realignment of the magnetic domains takes energy to be done, but a small fraction of this power can be given back when these domains goes through a lower energy configuration. Therefore, for some given instants, losses can appear as negative, though globally it will always be positive.

Best regards,

Alejandro