Questions tagged [magnets]
24
questions with no upvoted or accepted answers
4
votes
1
answer
357
views
Magnetic decoupling torque
I have a system consisting of 4 magnets rotating at speeds between 200 and 6,000rpm, which are facing 4 other magnets with a 0.5mm gap between the two sets. The set-up looks like this:
Both sets of ...
- 1,831
3
votes
1
answer
212
views
How is the attractive force between two magnets changed when they are separated by non-metalic solids?
I recently encountered the following practical problem. We have a system of several layers:
a neodymium magnet; a disc, dimensions and grade to be determined
1 mm of 925 sterling silver; we can ...
- 131
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 ...
- 21
2
votes
0
answers
136
views
Using magnetic field readings for linear gesture recognition
I am thinking about using a permanent magnet as an input device for my smartphone. I have been reading some papers about it, but I really want to understand how things work. Using the integrated ...
- 21
2
votes
0
answers
51
views
Could magnets at the RHIC be damaged like the ones at the LHC were in 2008?
In 2008, an electrical fault led to a freaky magnetic quench at the Large Hadron Collider, which in turn released a lot of helium, damaging dozens of superconducting magnets in the process and setting ...
- 2,475
1
vote
0
answers
59
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 ...
1
vote
0
answers
44
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 ...
- 21
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 ...
- 24.3k
1
vote
2
answers
160
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 ...
1
vote
0
answers
76
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 ...
1
vote
0
answers
87
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). ...
- 111
0
votes
0
answers
20
views
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 ...
- 105
0
votes
0
answers
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 (...
- 101
0
votes
1
answer
50
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 ...
- 1
0
votes
0
answers
32
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 ...
0
votes
0
answers
26
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 ...
- 21
0
votes
0
answers
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 ...
- 1
0
votes
0
answers
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 ...
- 339
0
votes
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 ...
0
votes
0
answers
44
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 ...
- 115
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 ...
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.
- 11
0
votes
1
answer
681
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 ...
- 1
0
votes
0
answers
38
views
Calculate the relative pulling force as function of size for neodymium magnets
I want to optimise the size and shape of a magnet for a desired pulling force. (Please forgive my limited knowledge of magnetism).
A cylindrical magnet fixed to an object will hold it in place by ...
- 1,304