Core falling out of electromagnet

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SUMMARY

The discussion centers on calculating the minimum current required to prevent an iron core from falling out of an electromagnet. The setup involves a solenoid with an outer diameter of 38mm, an inner diameter of 14mm, and a core diameter of 12.5mm, all with a length of 70mm. The solenoid has 335 turns, and the core's permeability is approximated at 10000 times the permeability of free space (mu_0). The geometry of the solenoid and core is crucial for determining the necessary current to maintain the core's position.

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  • Understanding of electromagnetism principles
  • Familiarity with solenoid design and calculations
  • Knowledge of magnetic permeability and its significance
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Electrical engineers, physicists, and hobbyists working with electromagnets and magnetic levitation systems will benefit from this discussion.

lujacobs
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Hello,

I'm trying to levitate the iron core of an electromagnet at a certain postion. How can I calculate what the minimum currennt is that I need to put on the electromagnet to prevent the core from falling out at the bottom?

Is there an equation to know at what position the core will be if I put more current on it?

Thanks
 
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I'm not sure I understand this. The core of an electromagnet is magnetised by the current solenoid, and is held in place mechanically. Why would it fall out and what would stop it?
 
Is is not held in place machanically. It is just a solenoid with an iron core in it.
 
Last edited:
There is no easy formula to calculate this, and the geometry of the setup is important.
 
The outer diameter of the solenoid is 38mm, the inner diameter is 14mm.
The diameter of the core is 12.5mm. Both are 70mm long.
The number of turns on the coil is 335.
I don't know what the permeability of the core is, but I approximate it at 10000*mu_0. But I can verify this experimentally, when I know the correct formula for the current at which the core will fall.
 

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