Difference in power using computation on regions or circuit

ujeym

Hello,

 

I am using Altair Flux to model multiple coils that transmit power to a load, that is meant to be heated inductively. Getting the results in the Post Processing via "Computation on physic entity" offers the options to compute on a Region as well as via the Circuit.

Comparing the power values I am getting for the simulated coils has me a little puzzled. There is a stark contrast computing apparent power, active power and reactive power respectively using the options mentioned above. The joule losses are the same between both compution options.

In the circuit current sources have been used to power the coils.

A list of values to get a better picture of the contrast mentioned:

Apparent Power: ~640VA (computation via region) / ~3400VA (computation via circuit)

Active Power: ~5W (region) / ~900W (circuit)

Reactive Power: ~650Var (region) / ~3300Var (circuit)

 

I have trouble coming up with a power balance, that explains the values Flux produces. If you could point me to the reason for the difference in values, that would be greatly appreciated.

 

Kind regards

fzidat

Hello;

 

Do you have periodicities and symmetries ?

 

If yes, then the quantities computed on the regions are given only for the displayed part.

 

What you compute on the circuit is given for the whole device even if you used symmetries and periodicities.

 

When you compute active power, it contains the Joule losses and the power transmitted to the other parts.

 

The apparent power and reactive powers computed on the circuit are given for all the device (even in the air or vacum).

 

Best regards