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.
348
questions
0
votes
1
answer
67
views
What does resonance means in inductive coupling? [closed]
From what I understood: resonance helps achieve higher coupling coefficients in coils.
What does it mean and how is it achieved?
0
votes
0
answers
33
views
Easiest way to detect objects using DIY materials
I want to build a Scrabble board that detects tiles placed, mainly as a one off challenge and learning experience (i.e. not a commerical product). I haven't started building yet: I'm trying to work ...
- 101
1
vote
2
answers
70
views
In the perfectly coupled transformer, there is no voltage induced in the primary due to the loaded secondary?
When the coils of a transformer are perfectly coupled, the equations include only the self induced emf in the primary and the mutually induced emf in the secondary. However, when speaking of loosely ...
- 361
0
votes
1
answer
64
views
EMF induction in a coil placed in a variable magnetic field
Consider a conducting coil placed in a variable magnetic field. By the laws of nature, an EMF will be induced in the coil. Between which two points is the EMF induced in the coil?
If we consider it to ...
- 1
0
votes
0
answers
24
views
stator current in induction motor when load increases
When the load increases the speed of the rotor decreases and so the relative speed of the rotor and the magnetic field of the stator increase (slip increase). As a result, the induced emf will ...
0
votes
1
answer
45
views
Induction motors torque measurement
I am to calculate the running efficiency of a 3-Ph squirrel cage induction motor. I have the rated data for the motor. I have the load speed of the motor but I need output torque to calculate the ...
4
votes
7
answers
2k
views
Why does a 1:1 transformer preserve voltage?
In the context of transformers, it seems intuitively obvious about winding ratios; for example doubling the coils on the second winding doubles the voltage.
But this seems to skip over the question of ...
- 910
0
votes
0
answers
98
views
Example problem of induced emf in a coil rotating in the earth's magnetic field
I just recently learned magnetism-coil-faraday's law and I want to do some real world problem solving.
Question: Let's say a copper wire coil (20 mm dimeter (r=10 mm)) of 3 turns (N=3) is on the ...
- 45
2
votes
5
answers
1k
views
How do transformers work?
I am a recent EE graduate and never really understood how transformers work.
I am having trouble understanding how voltage is increased at the expense of current in a step up transformer.
I understand ...
- 29
0
votes
1
answer
43
views
Would the inductor have an inductive reactance due to mutual induction via an AC source?
In a setting like that in an ideal transformer. An AC source connected to the primary induces an AC voltage in the secondary. Would the secondary coil have an inductive reactance in this process?
- 361
0
votes
0
answers
141
views
Equivalent Circuit of Induction Motor
To find the equivalent circuit of the rotor side of an induction motor, the resistance and the reactance changes to ensure that the current in the rotor remains the same, whilst removing the slip term ...
- 25
0
votes
5
answers
110
views
Is the communication between transponder car key and car digital or analog? [closed]
I am surprised to not find much info on-line about the technology and communication technique that car immobilizer systems use to communicate with the transponder key.
To be more specific, my 2001 ...
- 309
5
votes
1
answer
554
views
Why can domestic induction stoves heat aluminium tape, but not aluminium pans?
Domestic induction stoves can't be used with thick aluminium or copper pans, but when I try to heat aluminium tape it does get hot.
Can someone explain why this is the case?
- 61
2
votes
1
answer
140
views
LC Resonance with Inductor with Solid Metal core
Consider inductor with air gap and solid metal core made from material with relative magnetic permeability 1 regardless of temperature (such as copper or aluminium).
There is Air gap between coil and ...
- 39
0
votes
2
answers
56
views
Can I tap the hot wire leading to stove hood vent fan to power a low current LED warning bulb by mean of induction?
I cannot hear the hood vent fan running and I waste a lot of electricity. I know about lighted fan switches but they are not always found in every stove hood. Mine has no lighted fan switch. I use the ...
