Eddy current Definition and 85 Threads

Dear All, How laminated core helps in reduction of the eddy current? How reduction of area is useful in reduction of eddy current? Thanks.

I'm trying to damp an oscillating metal plate with a neodymium magnet. Things I know - Remanence of the magnet - The magnetic flux density at distance z (from the distributors site) - Dimensions of the magnet - Plate material (Aluminium) - Distance to the plate. What I'm trying to find out is...

Hi, I have been trying to understand eddy current loss in transformer cores but seem to have run into a bit of a misunderstanding with one of the books I have read, and I was wondering if someone could just clarify if I have got this all right. starting with the beginning, if the magnetic...

Homework Statement Refer to Figure attached. A disk of conductivity σ and thickness b rotates around an axis through its center with a magnetic field B applied perpendicular to the plane of the disk over a small area a2. Find the approximate torque tending to slow the disk at the instant its...

Hi here, I am trying to make an efficient ribbon microphone motor. My target is to get a highest possible output voltage so it can be plugged into a regular mic pre-amp. It should have possibly flat output on frequences 20Hz to 20KHz. I know that electric output depends on magnetic field...

Hi experts, I wonder anyone of you have an idea on whether we can include a discrete component (specifically a capacitor) into an "Ansoft Maxwell 3D" eddy current design. Little more description: I do have a specific eddy current design with a coils. I need to add a series capacitor and...

I'm setting up an experiment and I 'd like to somehow quantify the effects of magnetic braking on a simple pendulum. At the moment, I have a curved sheet of Aluminium that I will swing freely between two magnets set up in yoke (horseshoe magnets). The magnets induce eddy currents in the...

Homework Statement I want to know whether Eddy current and Induced Current are same? Homework Equations The Attempt at a Solution 1)When flux linked with a circuit changes, an emf is induced in the circuit and this emf is called induced emf and the current is called induced...

As the tittle, can varying magnetic field ( well EM) cause eddy current in non magnetic conductors like aluminum? If so, why? Thanks Alan

Problem: Calculating the eddy current distribution inside an infinitely long cylindrical conductor inside a straight and infinitely long solenoid energized by an alternating sinusoidal current. The problem has a perfect summery and we know that magnetic field and the eddy current depend on...

Hello, I'm new on this forum. I hope I could help some of you next days. But today I have a question for you. I have a geophysics oral exam on wednesday. The course material is not clear, and I don't understand the wikipedia pages. What is the physical difference between displacement current...

Hi, I am trying to do a simulation for the current distribution in a cylindrical conductor wire using MAXWELL 3D. I used eddy current solver and assigned excitation of current 1A at both ends of the round wire. (I set length L=2mm, radius R=1mm) The field plot seems ok, having highest current...

I searched a lot of google for calculations on eddy currents, and got a lot of things that describe how eddy currents work, but almost nothing about how to quantify the induced currents and the resulting magnetic field. Does anyone here know much about where to start? In particular, I'm...

I have an experiment in which I have two solenoids where one induces an EMF in the other. I then introduce copper plates between the two coils and measure the decrease in induced EMF in the second solenoid. How could I calculate the power loss due to eddy currents induced in one of the copper...

Homework Statement I am investigating the penetration depth of eddy currents within a copper slab. A solenoid is being used to induce the eddy currents within the copper. As a result of the experimental design, I need to calculate the power loss due to the eddy currents and I can't find any...

Homework Statement As given in the picture.The Attempt at a Solution So this is what i have done. I calculated: \frac{d\phi}{dt} = B \pi b^2 *\frac{\omega}{2\pi} = e.m.f. R = \frac{\rho a}{at} Thus, I = emf/R = \frac{ar \omega t}{\rho} Sub in I into F = BIL taking L as a. But i...

Homework Statement I understand that when a conductor ( we assume that it is a thin square sheet with no resistance) move say with a constant velocity perpendicular to a uniform B-field, there will be a current induced in the conductor (eddy current). This induced current will oppose the...

I am designing an eddy current brake system for use in roller coaster design. I have the flux density required to reduce the speed to what i want it to be. what i need to do from that is work out the dimensions needed to obtain his flux density. the configuration is for identical magnets...

what is the difference between eddy current and induced current? and how could eddy current cause energy loss? does the induced current cause also energy loss? what is the difference between back emf and induced emf? all these things are confusing me. thanks in advance

Hey guys, our professor did a demo for us after the class since they just received new equipment, and unfortunately he didn't want to explain to us all the mechanics of what we witnessed because I'm currently following the mechanics course, but this was an E&M related demonstration. I know a...

Homework Statement [PLAIN]http://img94.imageshack.us/img94/224/92898534.jpg The figures show two types of magnetic cores that lie along the z-axis. The solid core has length L, radius a, and conductivity σ. Laminated core has N filametary cylinders each with length L and conductivity σ. If B...

Homework Statement For my internship I need to solve a problem with eddy currents involved. The problem shows a U-shaped aluminum slider (see attachment) with steel plates on the left and right side mounted on it. In this aluminum slider there are 10 magnets (5 at each side) with a...

Hi guys I may have posted in the wrong section. If I have 2 magnets pushing away from each other (one is fixed) the other is on a crank. And the crank is spinning around 2000 RPM (33.33 crank rotations every second) how will eddy current effect the 2 magnets? I have Wikied "eddy...

Hello, I am using Maxwell SV to model the magnetic field inside a solenoid coil. I am currently using the eddy current solver as I have an AC source (167 kHz). When I map the H field in the post processor is the software computing induced magnetic field due to eddy currents in the conductor...

I am trying to understand how the Eddy current pendulum works. I know that the changing magnetic field will generate the eddy currents in the pendulum due to Faraday's Law, and that these currents will align so as to oppose the magnetic field. But where does the force come from? If its due to...

Increased lattice vibration impedes the flow of electron. This in turn, increases temperature and resistance occurs. So, the temperature is a form of heat energy loss. Eddy current caused by EMF leads to energy loss. When revising, I seem to get confused with the differences and mix Eddy...

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...

Hello all :) I'm doing some coursework on eddy current braking atm and I just need to clarify that I have the right idea about how the concept works. Right, I know that when a conductive plate passes through the poles of a magnet, the change in magnetic flux induces eddy currents in the...

This kind of belongs to halfbakery.com, but it is down now. (I found on archive.org that) hydraulic pump (like the kind used to lift cars) forces and the surface areas of the two ends works by the equation F1 = F2(A1/A2). Say you had a .025 m^2 (end 1) surface on one end of a hydraulic pump...

When you drop a (strong) magnet into a copper pipe, it slows down. Is there an equation for calculating the force? I have searched and searched Google, but all i found was F=[(B^2)(l^2)v]/R, where B = magnetic field, l = circumference of tube, v = velocity of magnet, and R = resistance of pipe...

I have to try and design said system for a university project where we're designing a roller coaster. Basically its going to be a copper fin that will move between two magnets but I have no idea how to calculate the mass of copper and strength of magnet I'll need to decelerate the car...

Whenever you stroke a magnet against a plate of copper or another good conductor of electricity you always get a force that opposes the movement of a magnet called and eddy current. What i want to know is can you calculate the repeling force of the eddy current? and if so how? I know that the...

how can we measure the amplitude of vibration of a sheet with and eddy current displacement sensor?:confused: :frown: :cry: my course work is : how the time taken for the amplitude of vibrating sheet of aluminium to halve,varies with the magnetic flux density of the field in which the...

I Dont Have Any Question

I have some problems designing the coil of an eddy current sensor. I've been searching for some information in different pages and each of it has some criterion for the desing. I would like to know if anyone knows which criterion must I follow to achieve a successful desing. for any...