# Help with electromagnet build?

J

#### jp

Jan 1, 1970
0
To start I am a novice at this, but my mind just will not let go of this.
My situation is as follows: I have a 1" X 3" (1010) steel core. I want be
able to build the strongest magnet possible, power supply, wire size and
amp turns ect. I have tried every loose cannon combinations and either I
have power with heat or no power and no heat. Diligently been reading
everything I can and getting more confused on how to get the right
combination. I want a powerful strong magnet that will not self destruct.
Can anyone help me????????????
Plott

R

#### Roy

Jan 1, 1970
0
JP
There is a formula for the perfect magnet, look it up in under Gauss
or DeGauss, it's not all that clear to me from here., but build it
without the core in consideration., and when you add your reluctant core
it'll consentrate & direct the magnetic flow better....
If I find the formula in my notes & books I'll let it here - but, do
a quick google of "how to build or make a magnet" should produce some
good results.....

Good Luck Dude !

Roy Q.T.
Urban Technician
[I don't make em, I just fix em]

D

#### Don Kelly

Jan 1, 1970
0
----------------------------
jp said:
To start I am a novice at this, but my mind just will not let go of this.
My situation is as follows: I have a 1" X 3" (1010) steel core. I want
be able to build the strongest magnet possible, power supply, wire size
and amp turns ect. I have tried every loose cannon combinations and
either I have power with heat or no power and no heat. Diligently been
reading everything I can and getting more confused on how to get the right
combination. I want a powerful strong magnet that will not self destruct.
Can anyone help me????????????
Plott

You do not specify the shape of the core. If you want high force, you want a
magnet where you have the minimum possible air gap. A straight solenoid is
not that shape. Look at the shapes of commercial lifting magnets (U or
co-axial) which are designed so that both poles act on the object being
lifted.
Typically, in determining the force, iron saturation limits the maximum
force at 0 gap and you want the flux density at this gap to be just below
the Knee of the saturation curve (otherwise higher currents and heating with
no gain. For even small non-zero gaps, the force will be determined by the
gap rather than the iron (whose mmf can be neglected).
So -what shape , what max force wanted, what is the magnetisation curve and
dimensions of the magnet as well as ampere turns can be determined.

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