| |
HANNA DESIGN CURVES
HANNA CURVES* provide a simplified method of calculating inductances with direct
current, and for determining the optimum air gap. Where the L is the a-c inductance
in henries, I is the d-c current in amperes, and V is the core volume in cubic
centimeters; calculate LI2/V and enter the left side of the chart
at that ordinate. Extend to the right along this ordinate to the appropriate
B, for a-c induction in gausses, and select the indicated abscissa for NI/l.
Calculate required turns by substituting the centimeters of path length in the
core material for l, and for the d-c amperas, I. The optimum ratio of air gap
length to path length (a/l) applies
to the points indicated.
|
|
|
