Questions tagged [magnet]
The magnet tag has no usage guidance.
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What is the max voltage I can apply to an electromagnet? [closed]
I have a small Amazon Electromagnet 4 ohms of resistance and wound with 110 feet of 28 AWG lacquered wire. What is the maximum sustained voltage I can put through it?
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Deflection of current in a metal plate conductor
If I have a metal plate (square in shape) and an electric current moves from one side to the other. I understand that most of the current will take the path of least resistance but all paths will be ...
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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 ...
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If I have two magnets repelling each other, will they always form a peak in the middle?
If I have two identical magnets, aligned so they repel each other a distance of X apart and at a height of Z I have Hall effect sensor, the peak of the magnetic field sensed will be at the distance X/...
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Where does the electricity in electromagnets come from if permanent magnets from generators decrease their magnetic strength?
The question has been puzzling me for some time, I presume electrical power starts from generators, the heat produced by them(generators) cause their magnets to weaken and electromagnets have to be ...
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Re-Magnetizing A Magna-Tip Screwdriver Handle
See what I added to the bottom of this question
Sorry for the high school level question. I would rather not spend my time experimenting. I have a quality gunsmith screwdriver set. The set contains ...
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Would a electromagnet be used to detect the presence of a permanent magnet?
I was wondering if there is any way I could use an electromagnet to detect the presence of a permanent magnet.
I am specifically thinking of using a planar type small coil. Maybe use a core or ...
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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 ...
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Electromagnet design and powering it up? (Fault prevention of DC supply for a small coiled Electromagnet)
I want to create an array of multiple electromagnet which I will be controlling using a microcontroller.
I will have around 100 such magnets lined in a squared grid 10x10. Only three or five at a time ...
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Is there a latching switch that will activate by motion?
I am working on a mini flashlight project. I would like to avoid holes in the enclosure to ensure waterproof-ness so using a standard slide switch is not an option for me.
I want to use a version of ...
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What geometry of magnet is typical for end-of-shaft Hall angle sensing?
While selecting parts for shaft angle sensing, I often have difficulty selecting magnets to act as the rotating magnetic field for a Hall angle sensor.
I've ended up selecting diametrically magnetized ...
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Why is there a potential difference between VCC and Output pins of A3144 hall sensor?
When we bring a magnet near the A3144 sensor the PD between output and GND goes to zero but how come does the PD between output and VCC becomes equal to the PD of VCC and GND. Also when the magnet ...
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Why does a Hall sensor use a solid magnet?
I have disassembled two motor circuits that use a Hall sensor. One is a cooling fan blower and the other is a 230 VAC motor.
The blower has a brushless motor and has its Hall sensor on the stator ...
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Making an automated chessboard [duplicate]
I want to create an automated chessboard. At the moment, I'm making the project and deciding what technology to use to detect which piece is at what position and how to move them. I'm not so skilled ...
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How to test if a motor's magnets are demagnetized?
I have a motor in front of me which I'm fixing because a magnet came unglued. I was given it by someone else so it's unclear why the magnet glue failed. It could have been from heat, speed, or just a ...
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