magnetic lagging in DC machines and skewing

[bhargava]

Hi,
I came accross magnetic lagging
because of which we introduce skewness in windings in DC machines
but i do not know any thing about the phnomenon of magnetic lagging so some one help me out by giving me all about that
tutorials,links could be of great help to me!!!
:) :) :)

[ante]

Hi,

The magnetizing current Im proportional to the voltage and lagging 90 degree in phase is nearly constant over the operating range, while the load current varies inversely with the sum of primary and secondary impedances.