Type of resistance imposed by eddy currents in inductors?

In summary, the question is whether eddy currents act as a series resistance or a parallel resistance in an ideal inductor. Evidence suggests that it could be either, depending on the situation, as eddy currents are caused by flux in the core resulting from current through the windings.
  • #1
Landru
107
1
I've got a rather simple inquiry, but I haven't been able to get a straight answer via Google searches.

When evaluating the impedance of an inductor, do eddy currents represent a series resistance through, or a parallel resistance around the ideal inductor?

I've read that eddy currents are resistive, suggesting they are a series resistance, but also that they "short circuit" the inductor, which would imply passage around the inductor, so I'm not sure which is the case.
 
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  • #2
Hmmmm ... Thevenin vs Norton ?

If you're talking about sine wave excitation why can't it be either way ?

No current through inductor , no eddy currents suggests series would work okay
No voltage across inductor no current through its parallel resistance suggests parallel works too.

Think about it - eddy currents are caused by flux in the core which results from current through the windings
for sinewave excitation flux and voltage are in proportion. dsin(wt) = wcos(wt)
 

1. What are eddy currents and how do they form?

Eddy currents are circular electrical currents that are induced in a conductive material when it is exposed to a changing magnetic field. They are formed due to the principle of electromagnetic induction, where a changing magnetic field induces a current in a conductor.

2. How do eddy currents cause resistance in inductors?

Eddy currents flow in a direction that opposes the change in the magnetic field that induced them. This means that they create their own magnetic field, which in turn creates a force that opposes the original magnetic field. This opposing force is known as Lenz's law and it causes resistance in the inductor, reducing its efficiency.

3. What factors affect the amount of resistance caused by eddy currents in inductors?

The amount of resistance caused by eddy currents in inductors depends on the material of the inductor, the strength and frequency of the magnetic field, the shape and size of the inductor, and the presence of any magnetic shielding or insulating materials.

4. How can we minimize the effects of eddy currents in inductors?

To minimize the effects of eddy currents in inductors, we can use materials with low electrical conductivity, such as laminated cores, to reduce the flow of eddy currents. We can also use magnetic shielding or insulation to redirect the magnetic field away from the inductor, preventing the formation of eddy currents.

5. What are the applications of eddy current resistance in inductors?

Eddy current resistance in inductors is commonly used in various devices and systems, such as transformers, motors, generators, and electronic circuits. It can also be used for non-destructive testing and measurements, as eddy currents can provide information about the material properties of conductive materials.

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