BLDC_sensorless_control base BEMF, Flux likage

Hi all, 

I am student from Hanoi University of SCience and technology,

My fields is motor drive,

I need some example of anyone who design BLDC Brushless Dc motor using what ever technique,

I prefer base on Back EMF or Flux linkage,

Any ideal for me please contacte me at email:

toankspm@gmail.com

thanks all your help,

Toan