Losses in thermal model in flux

Noti

Hello all, 

 

im working on a thermal model of a pmsm, and have one question about the losses. How can i add the copper losses as a function of the temperature?  In the examples in flux, the losses have been added as constans so they are no function of temperature, unless flux still takes that into account during the calculation in the background. 

 

Is it maybe enough if i add the copper losses as constant and make the copper depending on temperature?

 

Regards

asoualmi

Hi,

In this case you can use thermal coupling (steady state AC magnetic coupled with transient thermal 2D). In this application the losses are computed for each time step according to the temperature.

Best regards.

Noti

Hello, 

 

thanks for your help. To clarify this a bit more to me, if i want to calculate the temperatures, and lets say my copper gets a temperature of 200°C do i need to enter the copper losses at 200°C or at 20°C at the temperature of the environment? 

 

Regards! 

asoualmi

Hi,

In this case there is an example in Flux supervisor “Brushless IPM motor”. In this example we use magneto thermal Flux-Flux co-simulation. The coupling between the magnetic and thermal physics is done by exchanging losses and temperature. From the magnetic application we compute the losses, these losses will be used by the thermal model to compute the temperatures. Theses temperatures will be used after by the magnetic model and compute again the new values of the losses. the process is repeated until the convergence.

Hope this will help.

Best regards.