Hysteresis Definition and 79 Threads

I am trying to show that there are 3 nonzero steady states of \frac{du}{dt}=ru\left(1-\frac{u}{q}\right)-\left(1-\exp\left(-\frac{u^2}{\varepsilon}\right)\right)=0 I have tried using Mathematica and Mathematica couldn't solve it. I tried some algebra and that wasn't going anywhere so I am at a...

I need to demonstrate that there are 3 possible nonzero steady states if r and q lie in a domain in r,q space given approximately by rq>4. Could this model exhibit hysteresis? The below ODE is nondimensionalized. $0<\varepsilon\ll 1$ $\displaystyle \frac{du}{d\tau} = ru\left(1 -...

For a ferromagnetic material in the hysteresis loop, when increasing field from H=Hc, its magnetization (M) will saturate. But if we decrease field instead, will M decreases clockwise according to the loop? How can we make the ferromagnetic material back into the initial state (H=0, M=0)...

I've been looking into the induction heating a bit lately and have come up with a few questions. One is in regards to hysteresis losses. I know what hysteresis is and how it contributes to the heat generation, but how much of an effect does it actually have? Some articles I've read have...

Homework Statement explain, briefly, what a hysteresis cycle is [2 marks] The Attempt at a Solution I don't think the answer is to draw a graph because that is the next question. The subject is electricity and magnetism but the above question does not refer specifically to electricity...

I have a comparator ckt with external hysteresis. When I apply a square wave input everything works fine. The trip points are as designed, output goes high/low etc. But when I increase the duty cycle of the square wave to say beyond 75%, the output just stays high. I was playing with the...

electric hysteresis ?? How to deisgn an electric circiut to measure an electric hysteresis ??

I've tried looking on various websites to find a definition I can understand but every website describes it differently, even the online dictionaries. I have also tried looking in my Y&F University Physics. I just don't <i>understand</i> what elastic hysteresis is because most descriptions don't...

Hey All happy holidays, Some time back I took electrical measurements on a ferroelectric capacitors in which I would apply sin or triangle waves for a certain amplitude (typically 4-5volts) and I collected/mointered/measured the current. I then was hoping to take that current and calculate...

Can anyone explain the following lines? [Only the bit where the letters are capitalized] "The flux density versus the magnetization of the specimen for the various values of the magnetizing current of the solenoid is plotted by a CRO...from the figure, we can conclude that value for flux...

Hysteresis loop in probe?? Hello guys, I have done the Magneto-optical Kerr effect experiment, studying the hysteresis loop over some pieces of ferro- and ferri-magnetic pieces of metals (CDs and MiniCDs). The problem is the following, we first started by creating the calibration curve...

Hallo, If I have an hystersis loop (of ferromagnets) in form of scattered points in MATLAB what is the function or tool which i can use in order drew a continues hystersis curve(loop)? Thanks, Omri

Hallo, Does anyone familiar with an equation that describs hysteresis loop and First Magnetisation in ferromagnets? Thanks Omri

I'm having an issue with an RTD in the lab that I think may have some hysteresis affects going on with it. I know RTDs can be prone to this if not used properly but is there any practical way to confirm this without using some other standard (The RTD is the most accurate temp sensor I have...

Hi Guys, :smile: Can someone please explain to me the logic behind the representation of 'Magnetic Hysteresis loss' as a resistance in electrical equivalent circuits?... will be extremely grateful. I have studied some info on this subject on the net. Even though the physics of Hysteresis...

Hi Guys, :smile: Can someone please explain to me the logic behind the representation of 'Magnetic Hysteresis loss' as a resistance in electrical equivalent circuits?... will be extremely grateful. Thanks & Regards, Shahvir

the idea is , if we have the magnetic field strength (H) and magnetic flux density (B) so we represent the 'hysteresis cycle' to be B(H)=B my question is could we deduce mathematically the hysteresis curve ?? for example if we can provide a model of a nonlinear ODE so \frac{dB}{dH}= B^{r}-...

Homework Statement I would like to know how the energy loss happen in a tranformer and it would be very helpful if an example was provided. Energy loss in tranformer through hysteresis losses and eddy current lossess, how does it occurs Homework Equations Is this equations used...

could someone explain in layman's terms hysteresis, and why this would contribute to heat in electromagnets

Homework Statement It's a past paper question, but I just don't understand it. I must have missed something here... Homework Equations Maxwell's equations, \frac{B}{\mu_{0}} = H + M, M=\chi H change in stored energy = H.dB The Attempt at a Solution (a) \nabla\times H =...

What instrument would I need to get a hysteresis loop (Flux Density vs Magnetizing Force) for an inductor? Is it something that can be easily obtained given the proper equipment? Thanks! -Shad

I have the following unexplained phenomenon: (please excuse incomprehensible expressions I´m not a native speaker) Experimental setup: A 6 meter long measurment pipe is filled with a hydraulic fluid and has a square cross section (30mm²). The fluid in the pipe is pressurerised to 40 bar...

HI I don't think my question is very difficult. I understand what a Schmitt Trigger is and what it does. There is, however, a couple of calculations that I've long forgotten and need to know. I am currently doing an own time study course at work. How do I calculate the following? the...

Hi all, I'm having a problem with this subject and I was wondering if anyone could confirm/comment on my understanding. As I understand it, in a typical transformer, an AC current is supplied to a primary coil which induces an oscillating flux within the core. If the core is made of a...

Dear every one, I'm studying on micromagnetics problem using Brown's equation for static solving case, this equation derived from minimization of energy and it allows us to obtain a hysteresis loop of a magnetic material. All of my documents only say that from Brown's equation, we can...

Does phase change have hysteresis?

I would like to know how can one show that the area of a B-H curve, ie hysteresis loop, denotes the energy dissipated per unit volume during magnetising cycle. I can't find this anywhere and need it urgently. Thanks for any help. Kavita

can anyone tell me if gravity suffers hysteresis effects? as gravity travels at C i imagine this effect would only be relevant to ,a high speed massive body with an highly eccentric orbit, i also wondered if this effect had implications at the quantum level.

I am trying to get some information on CPU HYSTERESIS TEMPERATURE... does anyone know what that is?