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# Magnetic Permeability

29 Threads found on edaboard.com: Magnetic Permeability

## Transformer's core size

B is proportional to the magnetising current, not the load current, the two add vectorially... For ferromagnetic materials we should't consider it magnetic permeability as linear. At least within small ranges.

## Electromagnetic Flux Density Required to move an object

Hi guys, I need help with a problem I have as part of my study. I'm looking to calculate the magnetic field strength required to separate a moving polystrene microsphere which is coated with iron oxide. I know the following; 1. The force in newtons required to separate the sphere 2. The mass of the sphere 3. The velocity of the sphere is tra

## Relay electromagnet magnetization. Types of relays for maximum magnetic dynamic range

Hello, I would like to vary the magnetic permeability of a cored coil using an electromagnet, taken out from a relay. I want to be able to apply from very small magnetization to the coil, up to quite large, so I need high magnetization dynamic range (if such term exist). For that purpose: 1. What types of relays should I best choose? 2. What vol

## Magnetic permeability coil tuning, pros and cons?

I suppose you changed the Henry value of an inductor temporarily? This concept could be useful. A fixed inductor becomes variable. I may resemble the concept of the magnetic amplifier. By sending DC current through an auxiliary winding, you can alter how much current goes through the main winding. However if the inductor contains a metal core, th

Hi Mamase, You can artificially define a metamaterial by applying the reported relative dielectric permittivity and magnetic permeability to a material used in your design. On the other hand, you can simulate a metamaterial resonator (e.g. Spiral o SRR) in a periodic unit cell, and try to retrieve its effective material properties from the S-param

## Permeability data of Powder cores

Hello everyone, I am interested in determining the maximum magnetic flux that is entering my core in its steady-state operation. It seems that for the calculation, I need the permeability of my core. The problem that I have is that I am not so sure of what the permeability data in datasheets are. For instance in this page, www.cwsbytema

## relative permeability of ceramic?

Do you really mean permeability? That is a magnetic property and so the value is probably unity i.e. the same as air. If you mean permittivity then it depends on the ceramic. For example, alumina is 9.3-11.5 Keith.

## How magnetic core can increase a resistance of an inductor in HFSS simulation?

Hi. I'm working with an inductor modeling with magnetic core by HFSS. In material menu, it has following properties, Relative Permittivity Relative permeability Bulk Conductivity Dielectric Loss Tangent magnetic Loss Tangent Magnteic Saturation Lande G Factor Delta H And my magnetic core has all the same (...)

## Ferrite core diameter effect

The ferrite's Al (nH for one turn) depends on Douter/Dinner, and of course core heigth and permeability So it is not just the diameter. A core with more volume can store more magnetic energy, so can handle more current before going into saturation. If you have an existing design that uses the smaller core, but you have a larger one. Try t

## Which core area value gets used when gapping ferrite core?

The usual gap calculation doesn't use core area at all, just effective length and permeability, see Ferroxube data book. An accurate calculation would need to consider both acutal gap area and stray flux. At the end you have to refer to a 3-D magnetic simulation. Do you really need it? Curiously PQ50 isn't offered as a gapped core by Ferroxcube.

## magnetic sheet Inductance measurements

I have a Fluke PM 6306 RLC meter and I was wondewring how can I measure inductance of a magnetic sheet? Do I need an extra fixture to place my sample around it? I have calculated permitivity by placing my sample between 2 metal plates and measuring capacitance. I need to measure inductance in order to calculate permeability.

## Stainless Steel RFID Sensors

Stainless steel often has a relative permeability close to 1 , so it won't shunt magnetic fields. It will shield the signal a bit due to eddy currents, but as long as the steel is thinner than its skin depth, some signal will still get through.

## Properties of Silicon Carbide

Hi, I am modelling high power waveguide loads on HFSS and CST. One material I need to model is silicon carbide. I cannot find anywhere a resourse that has the magnetic loss tangent and permeability. Also anything I find for the permittivity and electric loss tangent seems to contradict other sources. If anyone has or knows where I could find

## calculate the inductance used in RF choke @ 12.8MHz

Oska, Be care that inductance is not the only electrical pnenomen concerned at this kind of inductors. Saturation magnetic efect is also welcome at this case; so, high-permeability core must be considered. +++

## Magnetic dipole moment of a solenoid with a core

How will the core with relative permeability Mu affect the magnetic dipole moment of a solenoid with current? Will it just increase Mu times?

## Magnetic coupling simulation

Dear all, I would like to simulate coupled coil, for example 3D solenoids or planar inductors. As the received power depends on numerous parameters (number of turns, distance, symmetry, frequency, permeability, even unconsidering non-linear phenomenoms), so magnetic field produced and received, simulation seems useful. Do you recommend som

## Noise pickup in audio transformer

To achieve high dynamic, an audio transformer needs a magnetic shield, typically a box made of a high permeability material, e.g. "?-metal". If your device hasn't an effective shield, it can't be used in an enviroment of interfering AC magnetic fields. The most severe problem are mains transformers, but I guess pulsating ground currents (...)

## Anisotropic materials with permeability tensor

hi Is there any anisotropic material in optical frequency which its "permeability tensor" can be changed by external electric or magnetic field?? thanks

## How to introduce Drude model in HFSS?

you can calculate the real and imaginary parts of permittivity/permeability in matlab using your drude/lorentz whatever model. and then you need to calculate the tangent delta electric/magnetic using these real and imaginary parts. you need to write these parameters in a data file in matlab, like: frequency - real(eps) and another file frequency -

## help in CST - changing the equilibrate mesh ratio

Sorry I have no specific advice regarding your particular problem. I've seen this happen alot with this software. Sometimes it's understandable; for example, maybe you have some small feature that would be expected to have a relatively large effect, e.g., a small air gap in a high permeability magnetic core, and it just doesn't get meshed proper