I'm trying to design a 16uH 50Arms 4kHz air core inductor.
At first it sounded nice and simple. I found this formula L= (d^2 * n^2)/(18d+40l)
L is inductance in micro Henrys, d is coil diameter in inches, l is coil length in inches, and n is number of turns.
Everything seemed great. Then i came across that this formula is only used for radio frequency 1 - 30MHz or so.
How would i design an air core inductor at 4kHz?