Following are a few equations which are useful in transformer
design:
Number
of turns (N ) required to support a voltage (E ) at a frequency
(f ) on a selected core cross section (A ) at a design flux density
(B ) (for square
wave
change 4.0 to 4.44) is given by:
Inductance
(L) of a coil of (N) turns on a core with a cross section (A),
path
length (lc) having a permeability (m) is given by:
Effective permeability (mg) of a core having a path length (lc ),
with an air gap (lg) with a material having permeabilty (m)
is given by:
(This
only holds for low (<100 mT) magnetic fields)
* for high permeability materials
Magnetising force (H) for a core having a path length (lc ),
with current (I) passing though a coil of (N)turns is given by:
