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Questions tagged [magnet]

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0
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2answers
57 views

Magnet Shake Generator - how to replicate in LTspice?

I made a generator for my wife's 3rd grade class, since they are learning about magnets, electromagnets and electricity. It's a simple pipe with a stack of magnets inside and you shake it to produce ...
1
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2answers
57 views

How should I chose a resistor for a home-made electromagnet?

I have a magnetic wire and I want to use it to make an electromagnet. The electromagnet will be powered by a 5V, 2A power supply. How do I know what resistor should I use in series in order to avoid ...
0
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0answers
36 views

Closed horseshoe magnet

If you would take a c shaped iron bar that you would join together (with threaded ends with another threaded bar for example) and then wind in wire, would it act like like a toroidal magnet or still ...
1
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5answers
92 views

Summarising from a group of sensors

I have a group of sensors the nominally output 2.5V but if they come in contact with a magnet they'll increase slightly or decrease slightly based on the polarity (north/south pole). These sensors ...
0
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1answer
36 views

Boosting the Analogue Response of a Sensor

I have a A1308KUATN-9-T Hall Effect sensor with the following sensitivity (from the data sheet): As you can see, the sensitivity comes to about 9mV per Gauss on average. My calculations (see below ...
1
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3answers
117 views

Can strong magnets cause permanent damage to RFID tags?

I have an RFID-enabled ID card for work that is used for building access. While I can use a lanyard, cord-reel, etc. to carry the card and still have convenient access to it, I'd like to simply put it ...
1
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0answers
67 views

Control magnet through stainless steel wall

I'm a mechanical engineer enthusiastic about learning electrical engineering and I speak french so I thank you in advance for your comprehension and your help. I would like to be able to activate an ...
0
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1answer
26 views

Time it takes for B to go to zero with R and L given

Given that your solenoid has inductance L and resistance R with initial current I such that there is uniform B inside the coil, I would like to figure out how much time will pass before B goes to zero....
2
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1answer
57 views

Are magnetic sensors able to pick up the electromagnetic field inside toroids?

From my understanding, correct me if I'm wrong, the electromagnetic field outside a toroid is 0, but it has a EM field within the shell itself. So my question is can a magnetic sensor pick up on this ...
0
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1answer
105 views

Can a magnet cause a microwave oven to unsafely radiate energy?

I've already successfully warped the colors on a large old CRT Television by setting unshielded speakers on top of it. If I understand correctly, this was due to the deviation of the electro-magnetic (...
0
votes
1answer
75 views

Could black-and-white CRT-based television sets be damaged by holding a magnet to the screen?

I know that it is possible to cause permanent (or at very least lasting) damage to some color CRT-based TV set by holding a magnet close to the screen and distorting the picture. SPECIFICALLY: it is ...
0
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1answer
125 views

Effects of Neodymium magnets on PCB

I'm currently doing a project that consists of: Arduino Nano. Battery. Buck Boost converter. GPS module. TSL2561 light sensor. BH1750FVI light sensors. LSM6DS3 Accelerometer. HDC1080. MicroSD shield ...
0
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1answer
29 views

Does a wider magnet mean less flux density?

I was using an online magnet strength calculator when I halved the diameter of the theoretical N52 magnet. The dimensions went from 32mm in diameter and 3mm thick, to 16mm in diameter and 3mm thick. ...
0
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1answer
141 views

Electromagnet stays energized after being switched off

I've designed a circuit to turn on/off a 12V electromagnet but when I turn off power to the magnet it still has a magnetic force. The magnetic force when OFF is not as strong as when it is ON but it ...
0
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1answer
43 views

Permanent magnet generator tooth width

I am thinking about designing a radial flux permanent magnet generator. However, I could not find any information about determining the tooth width. Should the tooth width be all the way the same as ...
1
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2answers
143 views

Tiny Magnet Sensor Switch

I know just enough about electronics to do the occasional Arduino or Raspberry Pi project, as long as I don't have to understand too much of what's going on. I am a software guy who dabbles in ...
2
votes
3answers
122 views

Why is the magnetic field around a bar magnet represented by iron filings?

Why would we use iron filings to display a magnetic field interaction and then teach this as the unaffected field of a magnet? Iron affects the field itself. This is analogous to an observer ...
0
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1answer
71 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. ...
0
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1answer
32 views

U Electromagnet Optimization

I have a U shaped magnet (like the one we used to see in school, half red half blue) that I want to make out of it an electromagnet by winding around it a 0.5mm diameter insulated copper wire, ...
0
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1answer
51 views

How to move a magnet to a specific coordinate on a board

I was just reading about Claude Shannon's famous maze-solving mouse, Theseus, which used a movable magnet under the maze to draw the mouse in a given direction. I'd like to play around with this idea. ...
0
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0answers
61 views

Falling Marble Sensor

I'm really building a sort of Rube Goldberg machine that students will assemble in order to guide a falling ball down through a series of gates/openings, where I need to detect when they're successful ...
0
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0answers
161 views

How to build a 15,000 Gauss hand-held electromagnet

I'm wondering if it's possible to build a small hand-held electromagnet shaped like a solenoid that is possible of producing a field of 15,000 Gauss. I'm familiar with the formula for the strength ...
0
votes
2answers
69 views

operating elecromagnet with 18650 cells

I'm not real versed in electrical circuits, I have an idea on making portable 12v electromagnets with 18650 cells. I'm not sure where I should start looking on making a safe and reliable circuit. my ...
2
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1answer
65 views

A mechano-electro-magnetical control circuit

I came up with the following mechano-electro-magnetical control circuit. The system as depicted here is in equilibrium, i.e. the upper spring s1 is relaxed , the upper circuit is closed (C1 producing ...
-1
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1answer
107 views

Electromagnet Wire/Voltage/Magnets? [closed]

I have some questions about my project. I want to make a big electromagnet, the size is about: Outer Ring: 50-70cm Height 35cm Diameter Inner Ring (The Movement): 32cm Diameter Now: is it OK to ...
0
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2answers
373 views

Permanent magnet in ac motor

Is Magnet in pmac motor degrade while they are in use because in tesla model 3 they uses pmac motor so we have to replace magnet frequently ?
0
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2answers
68 views

If I have pulsed dc current going though an electromagnet, with the magnetic field mimic the current at higher pulsed dc frequencies?

If I have pulsed dc current going though a copper wire electromagnet with no core , will the magnetic field mimic the current at higher pulsed dc frequencies?(such as ghz)
3
votes
1answer
98 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 ...
-1
votes
1answer
486 views

Magnetic Lock Power Source

I have just installed a 12v 350mA 600lb Electrical Magnetic Interior Door Lock. I have tested it with a cheap 12V, 1A DC Switching Power Supply Adapter and it works just like it was designed. I have ...
4
votes
6answers
4k views

Using Neodymium Magnets as wire connectors? [duplicate]

A new project I'm working has to be highly modular. All the electronics will be hidden in a case, so I was wondering if there's any way to use magnets and pass current through them for the project? ...
2
votes
1answer
197 views

Will placing a strong magnet near my electric skateboard Li-Ion Battery pack damage or discharge it?

The original clips securing my battery cover are broken and i thought of devising an alternate way to keep the cover shut involving a hard drive magnet and a hinge the battery pack would sit in ...
1
vote
1answer
387 views

What is the effect of a neodymium magnet on a smartphone's touch screen?

What are the possible effects of multiple neodymium magnets in relatively close proximity to the capacitive touch screens most smartphones use nowadays? As the screens themselves are LEDs the image ...
0
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4answers
234 views

Can an alternating magnetic field be “informationally” shielded?

I have asked previously about the properties & shielding of the "static" magnetic field previously, where I have determined that static fields are hard to shield. However what I am really ...
0
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1answer
265 views

Can two magnets damage or interfere brushless motor?

I want to get the absolute position of motor shaft, so I have added two magnets on the metallic thread (which holds the motor) and some hall sensors on top of shaft. Can the magnets in some way ...
13
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3answers
2k views

Does Shielding “Electrically” shield “Magnetically” too?

I know it sounds like a newbie question but I can't wrap my mind around it. An electromagnetic field is electric + magnetic field. So this means that when shielding an equipment offensively, for ...
0
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2answers
371 views

Can air itself be used as a magnetic core in CT (Current Transformer)?

I would like to measure a current flowing on an RF power line in ICP (Inductively Coupled Plasma) system. The frequency of RF is 13.56 MHz. So, I'm planning to construct my own CT (Current ...
4
votes
1answer
1k views

How an AC electric magnet works?

I want to know how an AC electric magnet works since the polarity of an AC current changing 100 times in each second (for 50Hz mains supply) so its magnet polarity(N & S) also will changed 100 ...
0
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2answers
336 views

IRFZ44n MOSFET Won't work

I'm making a magnet which gets turned of and on by a pwm signal and a irfz44n mosfet. The problem is; //The magnet gets current even though I don't apply current at the gate.// I tried a lot of things ...
0
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1answer
481 views

Types of Magnets to use for Bluetooth and electronics circuits

I am working on a project requiring Bluetooth capability. In order to make it convenient, it would be great to have a magnet in order for it to stick to things. I was just wondering if it is possible ...
0
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4answers
2k views

What effect does Permanent Magnet have on an air-core coil?

Given an air-core coil of known inductance and a given frequency of applied voltage, you can predict the coil reactance, the current, and the voltage/current phase relationship. What effect, if any, ...
0
votes
2answers
193 views

What is the magnetic field due to an electromagnet at a point that is not along its axis?

For e.g. at a point below(or perpendicular) to a cuboidal/cylindrical core electromagnet? I am confused whether the magnetic field for an iron-core electromagnet is limited to the axis passing through ...
2
votes
2answers
1k views

Are ferrite beads supposed to be magnetic?

I have replaced the ferrite bead on my audio cable with new ones that I just bought. But I have tested them and they aren't magnetic, it's just like a cylindric metal inside it, but I thought it has ...
1
vote
2answers
939 views

Are some integrated circuits magnetically sensitive?

In general, are ICs magnetically sensitive? I have a bunch of logic gate ICs, driver ICs and Atmel Chips that I carry with me regularly. In addition I have small magnets that I use to pick up little ...
-12
votes
1answer
319 views

Magnet generator [closed]

I am wanting anyone's thoughts on if an idea I have is possible. I want to build a generator using a bearing and some neo magnets I bought. I know nothing about generators like this or in general. I ...
1
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1answer
4k views

How much does the power of a magnet increase voltage on electromagnetic induction?

Searching through the site i found some useful info saying that a powerful magnet means more voltage, but i'd like to know how much does the voltage increase in relation with the magnet power (Given a ...
2
votes
1answer
180 views

What would happen if a diamagnetic material is placed within a capacitor, instead if a dielectric material?

In capacitors dielectric materials are sometimes inserted between the parallel plates. What would happen if a diamagnetic, or a paramagnetic material is inserted between the parallel plates of a ...
1
vote
1answer
122 views

Impact of permanent magnet on component storage

This may sound like a silly question, but it got me thinking. Apart from my lab at work, I have an electronic workbench at home. Most of my components are stored in small, plastic cylindrical jars (...
0
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1answer
580 views

Low pass filter output

I have a weird but annoying problem. I have an inverting low pass filter as in the figure below: simulate this circuit – Schematic created using CircuitLab I want this circuit to act as a RL ...
1
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1answer
726 views

Modelling a “single-phase permanent split-capacitor motor” in LTspice

I'm planning to use an AC fan in an LTspice simulation. The AC fan is made up of a single-phase permanent split-capacitor (PSC) motor. Here is the actual fan: http://uk.rs-online.com/web/p/axial-fans/...
0
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1answer
1k views

using a magnet to trigger a traffic light

Here is the link to the Traffic Detector Handbook from the Federal Highway Administration: http://www.fhwa.dot.gov/publications/research/operations/its/06108/02.cfm This will explain more about ...