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*To*: tesla-at-pupman-dot-com*Subject*: RE: ballast formula*From*: "Tesla list" <tesla-at-pupman-dot-com>*Date*: Wed, 21 Feb 2001 19:21:33 -0700*Resent-Date*: Wed, 21 Feb 2001 19:42:00 -0700*Resent-From*: tesla-at-pupman-dot-com*Resent-Message-ID*: <qd_AtB.A.-JC.1xHl6-at-poodle>*Resent-Sender*: tesla-request-at-pupman-dot-com

Original poster: "David Dean by way of Terry Fritz <twftesla-at-uswest-dot-net>" <deano-at-corridor-dot-net> Hi James, I have an old text book with some of that stuff in it. It says: L = N^2*mu*A/10^8*l (L equals N squared mu A over ten to the eighth l) where L is in henries, and N = number of turns mu = permeability of core (in English units) A = area of core in square inches l = mean length of core in inches The mean length would be {twice the length of the center leg (with the I part on there) plus twice half the width of the core} plus [the perimeter of one window} / 2. Trying to draw pictures with words is not my strong point. If you want, I can scan the pages and email them to you. later deano > -----Original Message----- > From: Tesla list [mailto:tesla-at-pupman-dot-com] > Sent: Wednesday, February 21, 2001 5:48 PM > To: tesla-at-pupman-dot-com > Subject: ballast formula > > > Original poster: "James T by way of Terry Fritz > <twftesla-at-uswest-dot-net>" <jamest2000-at-att-dot-net> > > Hi All, > I was wondering if anyone had some math that may help. > I would like to use a transformer core for a ballast. Given the > dimensions, magnetic properties, frequency, current ect. , is there a > way to calculate turns = inductance? Lets assume an ungapped core, say > an EI type. > I have the formulas to calculate inductance = reactance. From that I > can calculate current. How do you calculate inductance without trial and > error? > If you have the answer, please speak slowly, as my math skill are > lacking. :-) > James T > > > >

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