Questions tagged [magnets]

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New Method for a Passive Magnetic Bearing

Is it possible to create a passive magnetic bearing by layering the outside of a shaft with a magnetic film and placing a magnetic ring on the outside. The outer layer of the film would have a north ...
ARJ's user avatar
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26 views

What materials are most transparent to magnetic fields?

What common materials are most transparent to magnetic fields? I have two applications; in each case I want minimal distortion and degradation of the magnetic field: Wrapping/surrounding a magnet (...
RoUS's user avatar
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1 answer
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How do I design this magnetic bed?

I am looking to design a bed of magnets that I can lay on for health improvement. Ignoring any health concerns, the objective is to create the "purest" AND strongest negative field (NORTH ...
Gabe's user avatar
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1 vote
0 answers
54 views

How to calculate force / torque between permanent magnets

Given two permanent magnets (for instance, made with ferrite or neodymium with shape of: cylinder, disc, toroid, etc), how can I calculate the force / torque between those magnets? Are there any ...
Julio Otuyama's user avatar
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45 views

Any information on magnetic braking with copper?

I have an engineering project where I have to design and build a model of a drop tower from a theme park. The tower itself can be no taller than 40cm. I plan to use magnetic braking with copper to ...
18jbrana's user avatar
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31 views

What do you call the curved strip magnets in Hall Effect twist throttles?

Many twist throttles (for e-bikes, etc.) have long thin curved magnets read by a Hall Effect sensor. I want to buy some but I don't know what they're called. To clarify, this magnet is read by a ...
Kyler Laird's user avatar
1 vote
2 answers
58 views

Magnetic Locks On Metal Gate

I have a problem with the noise from a magnetic lock on a metal gate. It's a long story, but is it possible to put something between the connectors and have it still work? Essentially, when the magnet ...
Charlie Darwin's user avatar
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25 views

How can I transmit the force induced by magnetic torque?

So I'm working on a project where I'm trying to transmit the force induced by magnetic torque onto people's hands, thereby making it a haptic feedback system. This is the stucture that I designed to ...
NakedRaccoon's user avatar
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24 views

How much force in LBs could a 10in long 3in wide 0.5in thick piece of neodymium magnet repel off a 0.5in thick sheet of neodymium magnet

I know nothing about magnets and have an idea that I don’t know is possible to carry out. I want to replace the soles of a pair of shoes with one whole custom neodymium magnet on each shoe. What size ...
Ares's user avatar
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2 votes
1 answer
92 views

How to make the magnetic field intensity from a DC electromagnet bigger without changing its current, number of turns, or geometry?

I'm currently doing a project on magnetic haptic feedback using DC electromagnet. The principle of my haptic feedback system is very simple (figure shown below): A permanent magnet is stuck to the ...
NakedRaccoon's user avatar
0 votes
1 answer
72 views

How to concentrate magnetic fields using the least amount of material possible for a fixed area

So the goal is to a build a device that will redirect field lines from earths magnetic field at the magnetic north pole into a point. The goal is to maximize the area / amount of magnetic flux ...
Sidharth Ghoshal's user avatar
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33 views

Which is the better magnetic arrangement for a voice coil to give a larger amplitude of movement all else being equal?

Given everything else equal (e.g. same overall amount of magnetic material, same strength magnetic material, same coil, same power supplied, etc. etc.) which of these two magnetic configurations of a ...
Oliver Walters's user avatar
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0 answers
26 views

Forces acting on a SC-MagLev train

SC-MagLev trains are comprised of superconducting magnetic loops. The electromagnets on the outside that propel them as well are current-carrying magnetic loops. How can we calculate the force between ...
Adhirath Patil's user avatar
1 vote
0 answers
42 views

Does the aspect ratio of an electromagnetic coil affect the efficiency of magnetic coupling to a magnetic core?

Let's imagine we have multiple different sizes of magnetic coils, however they all have the same number of turns and use the same gauge of wire. They all share the same geometry for their magnetic ...
Flywheel's user avatar
2 votes
1 answer
175 views

How to calculate the magnetic force for metal on magnets?

I am currently trying to hold a metal block in place with the magnets shown in the layout below. These magnets are permanent magnets which both expose one of their poles on the top side as shown below....
Maarten's user avatar
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1 vote
2 answers
92 views

Passive magnetic bearing coefficient of friction

Imagine two axially-magnetized ring-shaped permanent magnets in a repulsive configuration where one is levitating on top of the other (and somehow radially constrained so the PMs remain ~concentric). ...
MehranJ's user avatar
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1 vote
1 answer
73 views

Why do rare-earth permanent magnets need to be recycled instead of just reused?

For years, scientists and engineers have struggled to find ways to efficiently break down and recycle rare-earth materials from various devices, especially permanent magnets.... My question is: Why do ...
Kurt Hikes's user avatar
1 vote
2 answers
56 views

Would this be the best permanent magnet design for vertical rod?

I'm trying to design and build a small vertical wind turbine that is held in place by permanent magnets, i.e. the rod with the blades on is held using magnets and gravity and allows the rod (that the ...
Anupheaus's user avatar
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1 vote
1 answer
98 views

How this synchronous motor works and how to modify them?

I have the following synchronous motor ripped out from an old range hood in my kitchen. I used new electrician tape to cover up the coils that should form the electromagnet--the old cover is too oily....
Faito Dayo's user avatar
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0 answers
43 views

What is the most efficient way to convert shaking/vibration to electrivity?

What is the most efficient way to get electricity from shaking? I am thinking about something like shown in the picture below (the magnet is going inside the coil), but maybe there is a better design ...
Zlelik's user avatar
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1 vote
1 answer
50 views

How does the magnet sheet sliding metal mechanism work?

I was watching this video - at 10:23 mark where the person was using a hook mechanism for sliding the metal sheets together and noted that sometimes the hook would get caught on a bad angle. To solve ...
PerplexingParadox's user avatar
2 votes
0 answers
56 views

Magnetic Force - Point of Load

I am using a Magnet like this in an assembly and I am trying to calculate the torque in point P2 (see picture below) resulting from the attraction force F between my magnet and the steel part. As I ...
timosmd's user avatar
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-1 votes
1 answer
136 views

Can the repelling force of magnets be used to create heat energy thus maybe creating a tyoe of heat generator [closed]

Imagine holding two magnets in the opposite polar the force it creates is so powerful what happens if we hold someting in between and the force only gets stronger if you push but what if we get a ...
user32888's user avatar
0 votes
1 answer
36 views

Use magnetic levitation to lift a carousel capable of turning 9000lbs [closed]

Allow me to describe my current situation. I have a 18 ft (5.486 m) carousel that is assembled using steel beams that are bent into two circles, an outer and an inner. And there are steel spokes ...
J. Clark's user avatar
1 vote
3 answers
257 views

What Goes Into Making a Variable Field Magnetic Motor?

(I feel it is necessary to mention that I am not an electrical or mechanical engineer; I just like to build fun things.) I've already got a good explanation of the concepts involved in a variable ...
Alex's user avatar
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0 votes
1 answer
125 views

Rotating a lead screw with a moving magnet

Is it possible to introduce torque on a lead screw (with no magnets attached to it) with a moving magnet that can only move parallels to the screw? (the lead screw is ferromagnetic) Something like ...
Simon's user avatar
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0 votes
1 answer
568 views

Looking for a compression spring alternative with 10x lifespan

I'm working on a project where 100k spring cycles is gonna last a few months Any recommendations on an alternative? I considered magnets but their sprigabilty isn't great (also, will they get ...
Simon's user avatar
  • 115
1 vote
1 answer
67 views

Can you make the magnets rotate inside the coils of Brushless motor?

I know that current brushless motors, have a non rotating core made of copper coils, with permanent magnets on the outside rotating around it, and eventually connected to a shaft. But i was wondering,...
ElBigZob's user avatar
1 vote
0 answers
26 views

Practical estimation of magnetic force

I'm trying to estimate the magnetic force which develops on a truss-like ferromagnetic structure (I want to estimate the motion of the object) in a uniform magnetic field, and I came to realize that I ...
NMech's user avatar
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-1 votes
1 answer
34 views

Cheap / Easy source of small amount of ferromagnetic metal [closed]

Hello all I have a magnet in my car to stick my phone to the dashboard. But I changed phone and now my new phone needs some metal stuck to the case in order to attract to the magnet. I read online ...
I_Keep_Trying's user avatar
1 vote
1 answer
76 views

Demagnetize neodymium permanent magnets at < 60 degrees C

I have 10 cylindrical neodymium permanent magnets about 5mm in diameter, 5 mm long, embedded in a thermoplastic polymer. I want to demagnetize them without removing them, or heating them above 60 C ...
tzudoh nym's user avatar
0 votes
1 answer
27 views

Designing a "ratcheting" spinning wheel with ferrous metal bits

I'm trying to design a freely spinning wheel that will "lock" into a few different configurations. I'm planning on placing a rare earth magnet near a certain point on the wheel, and inserting bits of ...
Slothario's user avatar
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3 votes
3 answers
201 views

How to design a magnet to handle a known force?

There is a metallical structure. I can estimate how much steel are in it. I would like to know how tall/strong a magnet should be to maintain a certain object to the metallical structure. The object ...
totalMongot's user avatar
2 votes
2 answers
4k views

How do I add magnets to the mechanism of my exercise bike?

I have an exercise bike that works by a (I'm assuming solid iron) flywheel and a 'horseshoe' of magnets that are moved in and out to set the difficulty. I have attached an image of the same design ...
Tim's user avatar
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3 votes
1 answer
206 views

Can a Foucault's current brake be used on the rails themselves to brake trains?

Your typical Foucault's current brakes operate on a disk, which is placed in an electromagnetic field in order to transform kinetic energy into heat without friction. The problem is that the disk ...
Bregalad's user avatar
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1 vote
2 answers
192 views

Can you use an electromagnet to break the connection of a permanent magnet?

At first, I had a particular goal, but I'm starting to doubt feasibility which has led me here. Original Goal: Create a small (3in²) electromagnet with 100% duty cycle capable of holding at least ...
Matt Kenefick's user avatar
1 vote
1 answer
344 views

Can magnetic stripes be read wirelessly with lasers or other technologies?

I know that magnetic stripes used in credit cards and audio tapes are typically read by a magnetic reader head. But is it theoretically possible for the stripe to be read by a laser in a similar ...
hamhung's user avatar
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0 votes
0 answers
24 views

Restricted Rotation using electromagnets

I was wondering if I could restrict the rotation of a part over another in one direction alone using an electromagnet but allowing me to have a continuous rotation if forced (maybe by using some ...
Colins V Jacob's user avatar
0 votes
0 answers
40 views

Is it possible to protect electronics on a cubesat from 100-1000g of acceleration

I am currently researching the feasibility of setting up a coilgun that launches Cubesats for a paper.
Rehan Sheikh's user avatar
0 votes
1 answer
662 views

Difference between permanent magnet and electromagnet exciter generator in principles wise?

I searched about this, but couldn't find any helpful explanations. All it says is that magnetic field is generated by either permanent magnets or electromagnets. In both cases, how does the exciter ...
Vyun's user avatar
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1 vote
2 answers
158 views

Compensating for a magnet in a device with a magnetometer

I'm working on a device that relies on data from a magnetometer. Unfortunately, the device also needs to have a fairly powerful magnet on it. Given that the design is fairly flexible, and within ...
TheEnvironmentalist's user avatar
2 votes
2 answers
237 views

How do I separate these powerful magnets from their base plates?

Old hard drives are my favourite source of super-powered fridge magnets. I have a bunch of them holding up countless childrens' drawings. But the magnets themselves are stuck to base plates of various ...
KlaymenDK's user avatar
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1 vote
2 answers
587 views

Is martensitic steel 455 magnetic?

According to wikipedia there are 3 types of steel based on the crystal structure: austenitic, ferritic and martensitic. Austenitic steels are non-magnetic where 300 series stainless steels belong to. ...
Teivaz's user avatar
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1 vote
0 answers
82 views

Does the Hyperloop One suspension require constant current through copper windings?

As a follow-up to How does the pressurized suspension of the Hyperloop not affect the tube pressure?, I believe (though I can't find where I read it now) that the Virgin Hyperloop One implementation ...
uhoh's user avatar
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1 vote
0 answers
75 views

Could we use NE 555 Timer for industrial magnetic proximity switching circuit?

I actually need a magnetic proximity switching circuit such that In the case of water in fuel sensor, whenever the water level in water in fuel sensor increases the magnetic float shall move and come ...
Gouthama Priyan's user avatar
2 votes
1 answer
445 views

Can a neutrally bouyant helium balloon be suspended in air using magnet entrapment?

The above picture is a basic concept of how a levitron toy works. Could the top floating peace stay entrapped in the magnetic field without having to spin if the edges of the balloon keep the top ...
user avatar
2 votes
1 answer
244 views

Generating practical power without an iron core, but with high RPM

Here's what I'm proposing - a small turbine directly coupled to a permanent magnet that's spinning at, say, 150k RPM. The magnet is enclosed one or several wire loops parallel to the axis of rotation. ...
Gunchars's user avatar
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0 votes
2 answers
83 views

Magnetic Entrapped Storage at 0 gravity

I understand this is a multifaceted question and I apologize . All of it is relevant to be understood. On Earth Fly wheel storage devices are used as an alternative to batteries. Even with magnetic ...
Procreator's user avatar
1 vote
0 answers
86 views

How can I calculate field strength of a Neodymium Ring magnet at an angle?

How can I calculate field strength of a Neodymium Ring magnet at an angle? I have a Neodymium Ring magnet, and I rotate the magnet around an axis perpendicular to the poles. (Not continuous rotation). ...
j0h's user avatar
  • 111
1 vote
2 answers
99 views

Could a magnetic audio tape recorder/player be made using a vibrating permanent magnet?

Cassette tape players use a read head where the magnetic field from the tape is directed through an induction coil. The induced current in the coil is then amplified and sent to the speakers. Now I'm ...
JanKanis's user avatar
  • 254