Hello all,
I am interested in inner workings of Magnetic Resistance component, trying to decide if I should use it in series or in parallel with Saturable Core. The help on Magnetic Resistance states:
Magnetic resistances (analogous to electrical resistors) are used to model frequency-depending losses in the magnetic circuit. They can be connected in series or in parallel to a permeance, depending on the nature of the specific loss.
If we connect it in parallel to a saturable branch they will “see” the same MMF and split the flux based on the time-dependent value of permeance. Is the permeance of magnetic resistance varied through time or does it remain constant? If constant, what is the expression for instantaneous power: F(t)^2/Rm? If we now drive the saturable core deep into saturation, the MMF will increase significantly which will, in turn, significantly increase losses on magnetic resistance. Which “nature of the specific loss" is this a good representation for?
The other option is to connect magnetic resistance in series to a saturable core. In this case they “see” the same flux and most of the “MMF drop” will be across the saturable core with the balance across the magnetic resistance. With the flux increase being limited by saturation and the permeance of magnetic resistance constant, I was expecting the power loss on magnetic resistance to grow much slower than the magnetizing current, but this is not the case. Using the same driving voltage, the loss on magnetic resistance is lower in series than in parallel configuration, but still much higher than I was expecting.
Am I thinking about this incorrectly? What is the right mental model for Magnetic Resistance?
Thanks in advance.