Inductance Calculator
The Formula
The formula used in this calculator is Wheeler's formula for single-layer air-core coils:
\[L = \frac{D^2 N^2}{18D + 40l}\]
Where:
- L: Inductance in microhenries (µH)
- D: Coil diameter in millimeters (mm)
- N: Number of turns
- l: Coil length in millimeters (mm)
Calculation Steps
- Measure the coil diameter (D) in millimeters
- Measure the coil length (l) in millimeters
- Count the number of turns (N)
- Insert these values into Wheeler's formula
- Calculate to get the inductance in microhenries
Example Calculation
Let's calculate the inductance for a coil with the following parameters:
- Diameter (D) = 20 mm
- Length (l) = 50 mm
- Number of turns (N) = 100
\[L = \frac{20^2 * 100^2}{18 * 20 + 40 * 50} = 57.14 \text{ µH}\]
Visual Representation
This visual represents a simplified view of the inductor coil with its calculated inductance.