So you think that in a none linear magnetic field this behaves as a Ohmig restistor?
A coil with a resistance
We are talking about losses and only ohmic losses. Do you mean a magnetic field should interfere with ohmic losses? How do they differentiate by ohmic losses running along a length of wire?
A transformer has other parasitic components, which are however represented by components with different properties - inductance and capacitance. Ohmic losses are represented by a resistor.
A transformer has other parasitic components, which are however represented by components with different properties - inductance and capacitance. Ohmic losses are represented by a resistor.
Outside the magnetic field they are Ohmic (almost) Why you thing that they behave ohmic inside the magnetic field?
Why should ohmic losses change value inside a magnetic field? Is it something I missed? I know the only way to influence ohmic losses is temperature change. If you hint towards skin effect or proximity effect, I believe these should be looked in a separate chapter.
I believe resistors only distort when they change resistance versus signal, heat, environment, etc.
Resistance that is constant . . . constantly follows Ohms Law.
Resistance that is constant . . . constantly follows Ohms Law.
They don't distort themselves, it's the increasing Rdc that contributes to magnetizing current distortion and shunt capacitance distortion.
True, but because i have no influence on a given Rdc of a transformer i prefer a transformer with a lower Rdc from the start.
So it’s a secondair effect.
Last edited:
If you feed a resistor with distorted current what do you get? A voltage distortion. At frequencies, where reactances, skin, proximity a.s.o. are of no big concern, Rdc (because of the distorted magnetizing current) show up as VOLTAGE distortion on the secondary (even with zero impedance drive). At frequencies where skin and proximity come into play, Rdc becomes part of Rac and Rac should be kept low for similar reasons. As always, a disadvantage (high Rac) can sometimes be a very welcome advantage by damping resonances outside the frequencies of interrest
Last edited: