All Questions
10 questions
4
votes
1
answer
326
views
Is it possible to smooth out a power signal from a magnet being dropped through a coil?
I am wanting to try some experiments to see how much power can be generated using various magnets and coils, but my understanding is the voltage is positive as the magnet approaches the coil and ...
- 43
2
votes
1
answer
72
views
Can a coil reversibly modify the field of a permanent magnet?
If I have (say) a rod shaped neodymium magnet and wrap it with a coil, can I use the current in the coil to add to or subtract from the permanent magnet's field in a reversible manner?
Also, would the ...
- 14.3k
0
votes
0
answers
112
views
Why is there no torque in electric motors when the Iq current is zero and Id current is not zero?
Random vector position of stator current ( Id + Iq = Is ):
Now I draw the stator current/flux vector as shown below where “Iq = 0” and “Id ≠ 0”:
From lecture I’ve learned that the south pole of the ...
- 101
3
votes
1
answer
574
views
How to add a magnet to a coil's center without disturbing coil's charging effect?
I have a very nice wireless charger which can charge my smartwatch.
Smartwatch itself contains a neodymium magnet on its back (and there are chargers which also contain another neodymium magnet to ...
- 1,043
0
votes
1
answer
78
views
Why doesn't a guitar pickup's top and bottom cancel itself out? [closed]
A guitar pickup is a coil of wire with some magnets in the middle. The magnets magnetize the steel guitar strings. When those strings a strummed, they vibrate, and since they're magnets they induce a ...
- 109
1
vote
3
answers
224
views
How to trigger an 8 channel relay module with an air coil and moving magnet
I just bought this 8 channel relay module on Aliexpress, and I'd like to try to trigger it using an air coil and a moving magnet, but I'm unsure how to connect the coil to the trigger and collect the ...
- 119
0
votes
0
answers
106
views
tip3055/2N2222 coil steering
i want to switch an electromagnet with a 2N2222 & TIP3055
switching should be triggered by a coil passing a magnet as optcal would be to slow
can anybody assist or give us some advice. we don't ...
1
vote
0
answers
30
views
In a non-magnet, excited-coil generator, what percentage of the generator's total output is used to excite the coil?
I am building a DC permanent-magnet generator with the magnets in the rotor. The stator coils are my unique winding. The overall efficiency of the generator is measured with a digital torque meter ...
- 11
1
vote
1
answer
385
views
Moving a magnet through coils wound in the opposite direction
Suppose I want to harvest kinetic energy by moving a magnet back and forth through a coil assembly. Faraday flashlights work by this principle, but to my knowledge those usually only have one coil. ...
3
votes
1
answer
114
views
How to drive a magnet with a coil from an amplifier (to test acoustic guitar resonant frequencies)?
I wish to attach a rare earth magnet to pieces of wood and to acoustic guitars and drive the magnet with a signal generator through an amplifier to a coil. In essence, turning the wood into a ...
- 31