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From: Thoremail@example.com (P!erCer)
Subject: Electromagnet Design Resources Needed
Date: 20 Jan 2003 14:51:17 -0800
NNTP-Posting-Date: 20 Jan 2003 22:51:18 GMT
I am looking into building a magnetic levitation device, and can't
seem to find much information about how the shape of a solenoid's core
affects the shape of the resulting magnetic field. I want most of the
power to be directed in a narrowly focused area in one direction...
I am thinking of using one of two methods to ascertain the
position of the metal piece being levitated so the field can be
adjusted. I have seen working models using either method. The first
uses a beam of light and a light sensor to reduce power to the magnet
when the object being levitated rises across the beam. This keeps it
in a hovering position. The other device used some kind of magnetic
field sensor that notices disturbances in the magnetic field caused by
the metal object being levitated. I would rather use the second
method...perhaps some kind of Hall effect device?
Anyway, if anyone knows of any good resources on designing
electromagnet shapes (I think I have the windings and power side down)
please let me know.
PS: My current design is sort of a bolt with a very wide top, like
The "=" are the wire windings. From what I understand, the forces at
the bottom would be more concentrated this way than if it had no top.
Here is an ASCII pic of my device's final looks. The "O" is the
object being levitated. "M" is part of the electromagnet. The "B" is
part of the base with the electronics. All the rest is simply
/ M \
| O |
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