# Questions tagged [skin-effect]

Anything related to skin effect, i.e. the physical phenomenon where the effective resistance that a conductor presents to an alternating current flowing through it increases with its frequency.

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### How to use skin depth

Do you use skin depth to determine the minimum thickness of your conductor? In other words, if I calculate skin depth to be 200 microns at the lowest frequency, should my wire, at a minimum, be 200 ...
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Why skin effect is respected when it comes to transformers but not to filters, even when they are dealing with same high frequencies? For example, in full bridge SMPS, with more than 100 kHz, we found ...
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### Busbars carrying uneven current due to proximity effect?

I think this must be the most naive question that I am going to ask. I now doubt on my knowledge of the electrical engineering that I have learned throughout my acadmics. We have a situation, wherein ...
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### How to calculate the size of copper strip with high current and high frequency?

We can easily find the recommended cross-sectional area of copper wire when the current is DC. But when the frequency is high, e.g., 13.56MHz, how could we calculate a suitable size of copper strip to ...
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### In what direction does skin effect take place?

I'm working with some problems with coaxial cylinders and the currents driven in those when considering high frequencies. In such cases, the skin depth has to be taken into consideration. One thing I ...
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### AC - impedance for a coaxial cable

Problem I want to calculate the AC impedance for a coaxial cable. A rough image is presented below: Because we have an AC current, suppose that the skin depth, which we can define as $\delta$ is ...
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### How does the Skin Effect at RF frequencies affect wire ampacity?

Through simulation we can find the current going through an inductor that is part of a filter network and this 1-sheet paper points out that ampacity diminishes with higher frequency because of the ...
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1 vote
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### Does skin effect increase the eddy current losses inside magnetic core?

From wikipedia -Ref1 The skin effect also reduces the effective thickness of laminations in power transformers, increasing their losses. From eddy current article in wikipedia-Ref2 "Eddy ...
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### How is current distributed in the cross-section of a wire? Skin effect for motor windings?

The startup h3x is claiming to have designed 3d printed coils and other innovations increasing the power density of electric motors by a factor of 3. https://www.h3x.tech/#amcoils They mention fill ...
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### Cable shielding adequate for video, but not audio frequencies

I am no expert in audio equipment, but to educate myself I have been studying. In the process, I came across a video which tests the audio frequency shielding of a purported shielded video cable. (I ...
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### Losses over frequency for microstrip vs. coplanar waveguide

At mmwave frequencies, coplanar waveguide transmission lines generally have lower loss than microstrip. What accounts for this, besides radiated losses? Or is the difference mostly related to the ...
1 vote
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### Microstrip skin effect

I've read that at high AC frequencies, current concentrates near the surface of a conductor, which is known as the skin effect. Does this also mean that current concentrates near the edge of thin ...
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### Skin depth calculation for non-sinusoidal currents

I have some questions regarding the skin depth of wires. In this forum it was already asked how the skin depth can be determined for a square voltage (e.g. inductor voltage of buck-converters) (link: ...
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### Skin effect at high voltage

I recently made a slayer exciter circuit in order to determine the resonant frequency of my secondary coil of my yet to build SSTC. When running the slayer exciter at 40V DC the circuit consumes ...
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### Measured Q factor of LC circuit does not correspond with calculated and simulated

Still having a problem with measured value of Q factor of parallel LC circuit. My measurememt setup looks like on the picture below. I use Function generator SFG-1003 and Oscilloscope Rohde-Schwarz ...
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### Iron wire as DC Power Filter

Since Iron has a skin depth of 220 micrometres at 60 Hz, and much lower at higher frequencies, how well would it perform as a DC power filter? Would there be any electrical downsides to using it as ...
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### Parasitic Inductance

when we say that in a wire there is a parasitic inductance, what is its cause? Is it the skin effect of the wire, the magnetic flux (generated by the current) through the surface of the total circuit ...
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### Why isn't there a non-conducting core wire for high-frequency coil applications

Background The commonly known skin effect formulas are derived and only apply to solid conductors. The commonly used "skin depth" only applies in these cases. It is for this reason that in some ...
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### Skin depth reference data for common materials

Is there any well-regarded publication that gives values for skin depths of common metals (Al alloys, brasses, other engineering alloys) in the Hz-to-MHz frequency range? I am not an electrical ...
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### Skin effect with superimposed frequencies

Does a high-frequency signal affect the skin depth of another low-frequency signal? E.g.: On a solid 6mm2 copper conductor, there are three currents running through it at the same time: 15 A DC 15 A ...
1 vote
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### Can I determine the rough frequency of an ac current by measuring the frequency of the electromagnetic radiation predominantly emitting from it?

Can I determine the rough frequency of an ac current by measuring the frequency of the electromagnetic radiation predominantly emitting from it? - if so, are there any other variable I need to ...
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1 vote
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### square wave skin depth

It is known that formula for skin depth is only applicable if waveform of the voltage is sinusoidal. So, i have an smps which works at 83khz frequency (square wave). What is skin depth for such ...
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### Skin effect and mag field distribution inside an electric conductor

Magnetic field inside a current carrying conductor Suppose I took a circular current strip in a current carrying wire. At the centre I have marked the directions of magnetic field due to four points 1,...
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### When high frequency current goes through a superconductor, does it still radiate off like it would with copper?

I've been thinking about the skin effect and that got me thinking: When high frequency current goes through a superconductor, does it still radiate off like it would with copper?
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### About current distributions and skin effect [closed]

I'm reading a book about signal integrity. And I have a question. Within each conductor, the current wants to spread apart to decrease its partial self-inductance. -> I don't understand the reason ...
1 vote
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### Litz versus aluminium tube

For a multi-kW inductive power transmission application, rather than Litz cabvling I should like to consider Aluminium tubing, to take advantage of the structural possibilities. What would be the ...
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### If charges flow along the surface of a conductor, why is resistance a function of cross-sectional area?

The skin effect dictates that charges tend to flow along the surface of a conductor. And yet resistance of a material is equal to resistivity multiplied by the cross-sectional area of the material ...
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### Does stranded wire reduce resistance from skin effect when strands are not insulated?

I've seen many discussions where people mention multi-strand wire improving conductivity when skin effect is a concern, but I often see Litz wire mentioned in these discussions. Litz wire contains ...
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### Skin effect - resistance changes during DC/AC variation

I have a question about skin effect, skin depth to be exact. Consider an AC system and a wire in it. Skin depth is, let it be, 0.2 radius of it. We know that if it was a DC system, it would spread ...
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### Cause of skin effect: eddy current inside conductor

We all know very well that due to eddy current (back EMF) generation within an AC carrying conductor, "skin effect" occurs. Eddy current density: Highest at center of conductor core Lowest at ...
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It says that the energy of the EM wave decays rapidly if it travels through a good conductive material. Therefore, much of the wave is travelling on the surface of the copper wire. (since it decays ...
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### Does skin effect appear in home wires?

A technician said: Its better to use a solid cables for homes (not stranded cables). I did not use any calculations but I think that stranded cables are better due to skin effect. We use 220V / 50Hz. ...
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### Why skin effect happens at the center of a conductor?

I was reading an article about Skin Effect. I know what skin effect is, but I wanted to know what causes it. Why is the back EMF strongest at the center? Why is it not distributed uniformly at the ...
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### Intuitive explanation of Skin Effect?

I'm trying to wrap my head round Skin Depth, we've derived the wave equation from Maxwell's equations, using the conditions that it's a "good conductor" ρ = 0, σ >> ωε and ...
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### Is skin effect applicable to pulsed DC systems?

Unlike AC, the direction of DC never changes. If the current varies with time, should there be enough variation in the magnetic field to cause redistribution of the current?
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### Is the skin effect a factor for low-current AC applications?

Another way to phrase the question might be, "Is the skin effect proportional to current flow?" I am only vaguely familiar with the skin effect, so I read up on the subject to learn more about it, ...
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### Does solid/multi-stranded/Litz wire make a difference in binary serial output?

I'm using two shift registers to control 16 digital outputs using only 3 pins on my microcontroller. The parallel outputs carry <= 20 mA DC, their sole purpose is to power LEDs. My microcontroller ...
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### Variation of resistance within conductor due to Skin effect

What is Skin effect? I learnt that it is a property exhibited by all conducting materials to restrict the flow of current ( eventually ac ) at higher frequencies to their boundary. My question is ...
1 vote
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### Impedance of 4 conductor system spaced horizontally apart

I have 4 cylindrical conductors spaced equally and horizontally apart. How can I calculate the magnitude of Impedance (Z) using the Skin effect and Proximity effect? I'm looking for an equation that ...
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### How do electrical body fat detector work?

I would like to build me own electrical body fact calculator from a microcontroller (the Arduino), but I would like to know how does it work. I have a 5V analog reader, So I guess I sould calculate ...
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### For a nerve-teste circuit, what causes the shock at low voltage?

As a bit of a weird test for my new 555 IC, I have been thinking of stepping down a 9V PP3 battery to five or so volts and creating a square wave @ ~100Hz and shocking my finger. I understand that a ...
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### Hardware to Detect EMG or Skin Resistance

I have been given assignment to design a device that can detect emg signal of Skin Resistance change while moving fingers. actually i need to track finger movements using some hardware containing ...
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