AC electromagnet optimization
AC electromagnet optimization
(OP)
Hi!
I need some help in optimizing an electromagnet for my company. All the parameters (like material/dimension of the core etc) are constant, I am not allowed to change them. The only what can vary now is a diameter and number of windings of the wire inside. Details concerning the electromagnet:
- E-I shaped steel core with the gap of around 2 mm (between the E and I part).
- The area of the intersection of the E-shape is 3800 mm2.
- Material used for the coil itself is an 'enamel' copper wire.
- The magnet is supplied by 320 V, ~50 Hz AC.
- The power consumption should be around 1 A.
- The electromagnetic force should be as high as possible.
Does anybody here have any experience with the AC magnets? I cannot find too many resources concerning this problem on the web. I'll appreciate any help.
Cheers
I need some help in optimizing an electromagnet for my company. All the parameters (like material/dimension of the core etc) are constant, I am not allowed to change them. The only what can vary now is a diameter and number of windings of the wire inside. Details concerning the electromagnet:
- E-I shaped steel core with the gap of around 2 mm (between the E and I part).
- The area of the intersection of the E-shape is 3800 mm2.
- Material used for the coil itself is an 'enamel' copper wire.
- The magnet is supplied by 320 V, ~50 Hz AC.
- The power consumption should be around 1 A.
- The electromagnetic force should be as high as possible.
Does anybody here have any experience with the AC magnets? I cannot find too many resources concerning this problem on the web. I'll appreciate any help.
Cheers
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RE: AC electromagnet optimization
L = 3.2 {(N^2)(A)}/{(1 x 10^8)(l)}
L = Inductance in Henries
N = Turns of wire
A = Area of the core in inches2
l = gap in inches
RE: AC electromagnet optimization
Could you please tell me how you derived that formula? The thing is that it does not take into consideration the frequency of the supply AC voltage, and I belive that it should, since the inductance depends strongly on it.
Cheers
RE: AC electromagnet optimization
In a gapped core inductor, the gap controls the inductance since the permiabilty of iron is, say, 1000 times the permiability of air.
The impedance of an inductor (XL) is
XL = 2 x pi x f x L
As a starting point, you want an XL of (from Ohms Law and your numbers)
XL = V/I = 320 Vrms/ 1 amp rms = 320 Ohms
L is then
L = 320/(2 x 3.14 x 50) = 1 Henry
You'll also have to make certain you don't magnetically saturate the iron core (target 10,000 Gauss)
B = ( Vrms x 10^8)/(4.44 x f x N A)
B flux density, Guass
f hertz
N Number of turns of wire
A Core area in cm^2
RE: AC electromagnet optimization
http:/
Remember to connect the entire string for the url if you cut and paste.
See attached excerpt.
RE: AC electromagnet optimization
RE: AC electromagnet optimization
Clyde38: Thanks for the link.
RE: AC electromagnet optimization
TTFN
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