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Electronics Forum / Basics / June 2007electromagnet winding
hello I am winding an electromagnet with some 29awg magnetic wire. I want to make to electromagnet with the same strength, but one core is about 3 time as big as the first. With the small core I get 185 Amp-turn with 480 turn (31ohm). The second core (bigger one) has a calculated 221.2 amp-turn with 700 turns and 38 ohm. because there is 3 times the metal I divided that by 3 so I get a 79 Amp-turn electromagnet with respect to the first electromagnet. How do I make the big core magnet the same strength as the smaller one ? If I use more turn, oddly enough I get even less amp-turn. Without changing the wire gauge, is there a way to get the same magnetic strength ( approximately 660 amp-turn ) with the big electromagnet ? thanks Ken > hello > [quoted text clipped - 12 lines] > magnetic strength ( approximately 660 amp-turn ) with the big > electromagnet ? Run windings in parallel, in this way you reduce the resistance of just having one long winding. You can easily double or triple the amp-turns by doing this.(of course now you might end up having to deal with heating issues) > hello > [quoted text clipped - 8 lines] > How do I make the big core magnet the same strength as the smaller > one ? The field strength depends on more than just the core area. You need to factor in the permeability of the material, the core magnetic path length and and take account of the influence of any air gaps too. Graham On Jun 27, 1:19 am, Eeyore <rabbitsfriendsandrelati...@hotmail.com> wrote: > > hello > [quoted text clipped - 14 lines] > > Graham Indeed, but I just a rough estimate here. I just came up with two problems. I hand sawed the excess of waffer stack. Somebody told me that this will create a short circuit. but guess what, I did not see anything between the waffers and this stuff is non conductive, so it should mind no ??? Also I was suprised by some calculation i did on an excel file. I get the same amp-turn no matter how many turn I make. The only difference is the resistance. Is this right ?? You can get the file here: http://www3.sympatico.ca/lerameur/motor_core_calculation.xls ken |
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