I Why is an iron cover needed for a solenoid?

  • I
  • Thread starter Thread starter yaxlei
  • Start date Start date
  • Tags Tags
    Iron Solenoid
AI Thread Summary
An iron cover is essential for a solenoid as it enhances the magnetic circuit by concentrating magnetic flux lines, which increases the magnetic flux density. This increased density leads to a stronger magnetic force, as the force generated by a solenoid is proportional to the square of the magnetic flux density. By reducing leakage flux with a high-permeability jacket, more flux is contained within the solenoid, resulting in greater efficiency. The design of modern magnets allows for effective force generation across various shapes. Overall, the iron casing significantly improves the solenoid's performance.
yaxlei
Messages
1
Reaction score
0
Hi everyone,

I've heard that it's better to close the "magnetic circuit" of a solenoid by adding a metal casing around the coils, but I don't get why : people say that it's for focusing the magnetic flux lines but how does it increase the force generated by the solenoid ?

Thanks if you reply, have a nice day.
 
Physics news on Phys.org
yaxlei said:
but how does it increase the force generated by the solenoid ?

by concentrating the magnetic field in the coil of the solenoid
 
yaxlei said:
but how does it increase the force generated by the solenoid ?
The magnetic force is proportional to the square of the magnetic flux density.
 
  • Like
  • Informative
Likes sophiecentaur and yaxlei
alan123hk said:
The magnetic force is proportional to the square of the magnetic flux density.
. . . . . and having the same flux across a small area of gap gives a much higher flux density than when the flux is spread over the whole of space around the coil. You put the armature where the gap is and that gives more force.

The old magnets were nearly all Horseshoe shaped so that you could get a worthwhile flux density somewhere, at least. Modern permanent magnets of all shapes can be strong enough to do a useful job.
 
alan123hk said:
The magnetic force is proportional to the square of the magnetic flux density.
yaxlei said:
Hi everyone,

I've heard that it's better to close the "magnetic circuit" of a solenoid by adding a metal casing around the coils, but I don't get why : people say that it's for focusing the magnetic flux lines but how does it increase the force generated by the solenoid ?

Thanks if you reply, have a nice day.
With the hi-mu jacket the leakage flux is greatly reduced.
Analytically, when you run the usual amperian loop inside & outside the solenoid there is less of the B integral outside the coil. So that means more flux inside.
 
Thread 'Question about pressure of a liquid'
I am looking at pressure in liquids and I am testing my idea. The vertical tube is 100m, the contraption is filled with water. The vertical tube is very thin(maybe 1mm^2 cross section). The area of the base is ~100m^2. Will he top half be launched in the air if suddenly it cracked?- assuming its light enough. I want to test my idea that if I had a thin long ruber tube that I lifted up, then the pressure at "red lines" will be high and that the $force = pressure * area$ would be massive...
I feel it should be solvable we just need to find a perfect pattern, and there will be a general pattern since the forces acting are based on a single function, so..... you can't actually say it is unsolvable right? Cause imaging 3 bodies actually existed somwhere in this universe then nature isn't gonna wait till we predict it! And yea I have checked in many places that tiny changes cause large changes so it becomes chaos........ but still I just can't accept that it is impossible to solve...
Back
Top