( ) ( )




















( )


( =






100 %

1-
2-
3-
4-











- 2- - 3 -

( )


( Magnetomotive Force mmf)

:










"

__________________________________________________ __________






1-
2- "
3- " "






1- ( laminated iron core)

2- Primry winding
( many turns) (small diameater)
3- (Secondry winding)
(few turns) ( more diameter than primry winding)
__________________________________________________
"
3




_______________________________________________

________________________________________________







ǿ
"
90


" "


"
= 90