Saturday, September 6, 2008

Inductor sizing equation USEFUL EQUATIONS AND CONVERSION FACTORS

Wheeler's formulas for inductance of air core coils which follow are usefull for radio frequency inductors. The following formula for the inductance of a single layer air core solenoid coil is accurate to approximately 1% for 2r/l <>0.2r. While this is a "round wire" formula, it may still be applicable to printed circuit spiral inductors at reduced accuracy.

The inductance in henries of a square printed circuit inductor is given by two formulas where p=q, and p≠q.

The wire table provides "turns per inch" for enamel magnet wire for use with the inductance formulas for coils.

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