synchronous machine parameters

when i use the synchronous machine module,all parameters were got from the example of simulink library,
but i could’t calculate the parameter(Ns/Nf) used in the model of synchronous machine in psim,is someone give
me an example of how to calculate the synchronous machine parameters.

You’ll find the relevant equations here
https://books.google.ca/books?id=V7BJBtgBi4IC&pg=PA236&dq=synchronous+machine+effective+turns+ratio&hl=en&sa=X&ei=1jf6UtHhAenH0QHqoYCYAQ&redir_esc=y#v=onepage&q=synchronous%20machine%20effective%20turns%20ratio&f=false

Effective turns ratio is equation 4.162 Ns/Nf = KsIf/Is