Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [induction]

Induction is the process by which the electrical or magnetic state of a body is influenced by the action of electrical or magnetic fields by proximity without contact between a “source” body and the influenced body.

341 questions
5
votes
5 answers

How does induction heating work?

There is unbelievable amount of contradicting information on the internet. The textbooks don't explain it in enough depth, so I have to ask here. I have an induction heating system which has a coil through which there is applied an AC voltage which…
MaDrung
  • 184
  • 9
3
votes
1 answer

Inside an Induction Cooktop

I came across this image of an induction Does anyone have any idea, on how to select the big Coil in the middle, and where can I buy it.
Sherby
  • 2,356
  • 6
  • 27
  • 46
2
votes
3 answers

Induced voltage in twisted pair located close to AC conductor

Anyone with MathJax-knowledge, feel free to clean up my formulas below. Thanks Hearth! Owing to certain circumstances I can't go into details to, I have to place my DC supply wires close to an AC conductor (a busbar actually). Twisted pair does not…
winny
  • 14,707
  • 6
  • 46
  • 66
2
votes
2 answers

Function of ferrite core in the induction cooker coil?

I wondering what is the function of ferrite core in the induction cooker coil? (In the other word why there are no ferrite core in traditional induction heater?)
M.A.K
  • 1,878
  • 5
  • 29
  • 43
2
votes
2 answers

How to make a circuit to detect a cut cable properly

I want to make my own alarm system, I put a long cable from my alarm and a sensor, if the sensor's cable is cut, the circuit change it's logic state, and then I read it. But the problem is that the long cable has it's own resistance and other…
Sebastian Tare B.
  • 123
  • 4
2
votes
1 answer

How to generate INDUCTION communication field strength of 3 dΒμΑ/m at 10 metres at 1MHz?

For E field short range communication, the usual limit specification is like 1mW transmitter and use dipole antenna as reference. What is the equivalent for magnetic induction (H field) communication? Both sender and receiver use coil antenna,…
EEd
  • 989
  • 4
  • 12
1
vote
1 answer

How does EMI from power cables affect analog signals in audio cables and digital signals in cables like Ethernet/HDMI/etc?

This question is for all those home theater and computer specialists out there. How does EMI from power cables affect analog signals in audio cables and digital signals in cables like Ethernet/HDMI/etc? The inductive electromagnetic energy from the…
riverofwind
  • 111
  • 2
1
vote
3 answers

Why is the mutual inductance the same?

In this attached pictured, the solenoid with the length l and cross sectional area A is solenoid 1 and the other with length say h is solenoid 2. Why is M₂₁ is equal to M₁₂ as my book claim? M₂₁=N₂Φᴮ²/i₁=μ₀N₁i₁N₂A/li₁=μ₀N₁N₂A/l. Now,…
Jack
  • 281
  • 1
  • 7
1
vote
2 answers

Why is the current rate of change constant in an ideal, zero resistance coil connected to a battery?

In a RL circuit, a battery, coil, and a resistor are connected together in series. In this case after closing the switch, from KVL, we have ε-iR-Ldi/dt=0, but in an ideal situation where R=0, ε= Ldi/dt. I must conclude that di/dt=ε/L=const, so the…
Jack
  • 281
  • 1
  • 7
1
vote
2 answers

What does a beginner need to know to build an inductive heater?

I'm a programmer by profession and building skills in metalworking and my goal is to build certain types of chemical reactors. As a learning project, I want to construct a programmable deep fryer. One of the missing pieces in my concept so far is…
Hanno Fietz
  • 243
  • 3
  • 7
1
vote
3 answers

How to measure coupling coefficient?

I have an EE core with one winding on one outer leg and a second winding on the other outer leg. I am measuring the inductance on one winding by having the other winding open and vice versa. For the mutual inductance I am measuring the aiding series…
James W.
  • 33
  • 1
  • 5
1
vote
0 answers

Battery-less Self-charging Graphics Tablet Pens - EMI

This is a hardware related question. A lot of the new graphics tablets have self-charging, battery-less pens. I assume the charging is inductive, either off the screen surface or from an antenna within the tablet. Can anyone please tell me more…
P Nielsen
  • 21
  • 3
1
vote
1 answer

Mutual induction

I need to find the mutual induction between two coils. simulate this circuit – Schematic created using CircuitLab The circuit look more or less like the one I have linked. I don't know how to calculate the mutual induction between the two coils.…
gamerEgirl
  • 15
  • 6
1
vote
2 answers

Does a turbine experience a countering electromagnetic force while it induces a voltage?

I am assuming yes, because of the law of conservation of energy. A certain amount of energy is required to turn a turbine. So if we want a turbine to spin as well as induce a voltage, then more energy will be required to do so. I suspect the turning…
Crosshair
  • 45
  • 3
1
vote
2 answers

Why the current flowing through an induction heater increases when something is heated up?

I think the whole question lies on the title. I can't understand how the material put inside the coil affects the total current drawn.
muyustan
  • 2,086
  • 24
  • 60
1
2