Sometimes they misstate this parameter too, stating it as "inductance per 1000 turns" but that's not really what it isĭC bias affects the core substantially. In this example AL was in units of nH/N^2 or in words, nanohenries per number of turns squared. They usually give a formula for inductance along with their version of what AL is for their cores. However we must make sure that the AL for a given manufacterers core is in the same units as above. L=1.26*10^-8*N*N*u*A/(gap*u+c) īut this AL value is usually given on the manufacturers data sheet for the core.įor example, if we have a core with AL=1000 (check data sheet for actual core and units) and with 45 turns we have: Two typical formulas for inductance are (length dimensions are in centimeters): It's a matter of knowing how to apply the theory and what differences from ideal to expect and how to effectively deal with them. But it's also been tried and done for ages now, so it's not impossible. Temperature and DC bias are typical influences, as well as the material variation itself. Yes it appears difficult at first, because there are a lot of variables.
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