Pickup Inductance
L = μN2A/l
Where,
- L = Inductance (H),
- μ = Permeability (Wb/Am),
- N = The coil’s number of turns,
- A = The coil’s circumference,
- l = Length of coil (m).
Permeability of different pole materials: (A=Alnico)
A5 = 1.4
A3 = 1.7
A2 = 2.8
Steel = 6.5