Questions tagged [magnetics]
Important to inductors, transformers, generators, motors, magnetic fields, inductive heating, magnetic storage, permanent magnets
454 questions
3
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0answers
19 views
How might I measure the force produced by a fluctuating magnetic field?
I would like to apply a fluctuating AC current (not sinusoidal) through a solenoid, then measure the resulting magnetic field. As a non-expert I am not sure what this entails. How can one measure a ...
0
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0answers
35 views
Homogeneous magnetic field inside aperture of PCB
I need to create a homogeneous magnetic field of a certain strength across a 10mm diameter opening of a PCB by using a current track on said PCB around the opening. The signal sent through the ...
0
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1answer
25 views
RF Cavity resonance based on E field
Is it true that the resonant frequency of a pillbox type RF cavity is dependent on the E field and the cavity's geometry size, because for each frequency there is only one size/radius corresponding to ...
3
votes
1answer
118 views
Purpose of a capacitor placed between the ethernet signal?
I came across attached Ethernet design for one my application. Since connector used here is with internal MagJack support external transformer is not used, The PHY used here is AR8031 part. In the ...
0
votes
1answer
51 views
Inrush on a reverse fed step down transformer
I found a paper from ABB with some unexpected information on inrush current. First, they feed 480V to the high voltage side of a 480V/208V step down transformer and measure the inrush. Then, they ...
2
votes
1answer
88 views
What would be the effects of a -1000 nanotesla geomagnetic storm be on modern electronics?
After reading the Wikipedia article on geomagnetic storms, I'm curious about what the effects of a -1000-nanotesla-minimum geomagnetic storm would be on modern military and consumer electronics, as ...
0
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2answers
107 views
Flyback transformer size vs. core losses
I'm in the process of compiling some notes on inductor design. I have good hands-on experience in the field (excuse the pun), but I feel this experience hasn't been totally systematic. I have been ...
1
vote
1answer
47 views
What effect in the current will have the change of the diameter of coil but same length of coil and same magnetic flux?
First image is one coil with the large diameter and a magnet rotating to create current in the coil. Second image is the same set but the diameter of coil is smaller.
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0answers
30 views
Solenoid Train - Best approach for magnetically guiding an object along a path?
My project is to pull an object along a path with solenoids, by cycling their on/off state. I don't know if ferrous core solenoids pulling steel would be more efficient than pulling a neodymium ...
1
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2answers
57 views
Low frequency transformer core material
For the first time of my life, I am trying to do a low frequency transformer. I’m used to seeing low frequency transformers built with, what I think to be, laminated silicon steel. I have some ...
0
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1answer
78 views
Will a regular neodymium magnet attract an electromagnet not currently being supplied with power?
I have a setup for one of my robotics projects where a neodymium magnet is placed across from an electromagnet. I power the magnet with DC through a L298N motor controller that is connected to an ...
1
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0answers
30 views
Magnetic circuit and material magnetization
We have a high power magnet (SmCo, 1T) whose field is being conducted through EN24T steel to an airgap where we perform measurements. The problem is that there appears to be a creeping change in field ...
0
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2answers
71 views
How can I extend the pulse length of a gate drive transformer?
I'm designing a coilgun stage that uses a pulse transformer to switch a high side N channel mosfet. The issue I'm having is that I can't get the firing pulse through the transformer to last longer ...
11
votes
2answers
2k views
What does this beautiful 8-winding magnetics do?
Sometimes our magnetic components turn out to be beautiful, like this one: I took this out of what looks like a projection TV, where there were three of these. Does anybody know what it does? I ...
1
vote
3answers
58 views
Does putting magnetic sensor in a metal housing affect performance of the sensor?
I'm putting IMU sensor to read earth-magnetic field. Does metal housing affect it? It might be basic question, but I lack experience in this exact scenario. (My device needs a bit of a reliability, so ...
