Questions tagged [magnetics]
Important to inductors, transformers, generators, motors, magnetic fields, inductive heating, magnetic storage, permanent magnets
609
questions
0
votes
0
answers
50
views
How is slope compensation implemented in the UC3843?
I was reading about slope compensation in the datasheet of UC3843 and I have watched this tutorial on youtube which gave me a general idea and overview about what slope compensation is.
Now regarding ...
- 123
0
votes
1
answer
95
views
Magnetic field in a tape
This is a theoretical question.
Let's guess we have an unknown magnetic tape cassette, no brand, no numbers or other signs.
The question is: do tools exist, that are able to analyze the magnetic field ...
- 13
1
vote
1
answer
61
views
How does a Current Injection clamp work from a physics persepective?
Current injection clamps are normally described as a transformer with a single turn secondary, which is all fine and good, but the construction of a transformer is different from a current clamp. ...
- 616
0
votes
0
answers
45
views
Can I deduce the saturation current of a transformer from the rated wattage and maximum frequency?
I have an SMPS transformer EE10, but am not sure about the saturation current it has, I tried doing some internet research, all what I can get is this so far :
I am trying to deduce the saturation ...
- 123
0
votes
0
answers
29
views
Measurement bias of Hall sensors with moving permanent magnets
I want to measure the magnetic flux density produced by a moving permanent magnet.
In my case, the magnet would move left and right alternatively at speed of 10 mm/s, with a constant vertical distance ...
- 1
4
votes
2
answers
98
views
Energy stored in a saturating inductor
We all know that the energy stored in an ideal inductor is \$E=\frac{1}{2}LI^2\$. However, real inductors with a ferromagnetic core don't have constant inductance. Particularly, when a specific field ...
- 209
7
votes
2
answers
416
views
Inductance after core saturation
Looking at the datasheets of some drum core inductors, at higher currents the inductance drops significantly due to ferrite core saturation. But it seems inductance asymptotically approaches a value ...
- 71
0
votes
1
answer
100
views
Why are common mode chokes used in Ethernet magnetics
I’m trying to understand the reason the common mode choke is required in Ethernet magnetics. To understand, if we look at the schematic, with the common mode choke (horizontal coils) removed, we are ...
- 616
5
votes
1
answer
259
views
Does hysteresis still occur if saturation is not achieved in a core?
When looking at a BH curve, what happens if the H field is raised to some level below saturation. For example we apply an H field that is only half way to saturation. On a BH plot this will trace a ...
- 616
0
votes
3
answers
107
views
Inductance Computed As Length in Historical Document
In "Formulas and Tables for the Calculation of Mutual and Self-inductance.", many equations compute the inductance of an arrangement as a length. For example, Equation 95, on p. 150, states,...
- 9
1
vote
1
answer
128
views
What are sources of extra low frequency magnetic field in a car with IC engine? [closed]
ELF analyser (16 Hz - 2 kHz) shows a magnetic field around 300- 2000 nT (at some position exceeding that) in car when petrol or diesel engine work.
When RPM increase from idle to 2500 RPM, magnetic ...
user326224
0
votes
2
answers
96
views
Transformer losses due to eddy currents. Why these losses are compensated by the transformer?
Here is my understanding of a transformer. Let's assume that we have the following ideal circuit, in which a coil is wrapped around a core and there are no core losses⎯excuse my crude drawing.
...
- 267
2
votes
1
answer
92
views
Magnetic Force Equation
Is there any equation where I can take a metal with a given volume/mass, with a certain amount of magnetic flux in it (in teslas) and find out how much force (in newtons) it exerts a given distance ...
- 173
5
votes
3
answers
1k
views
How can single phase induction motor's direction be reversed?
My house has a ceiling fan which has 2 wires which are connected to a capacitor, and Iam able to control the velocity and direction. After looking about these motors on the web I found out its ...
- 65
0
votes
0
answers
50
views
Magnetization of an Electric Guitar String
I'm trying to calculate the magnetic field generated by electric guitar strings of various gauges. The strings are made of some ferromagnetic material (pure steel or pure nickel). They are magnetized ...
