Lehung, I have found a great deal of info on 5-phase stepper motors from the oriental motor website, It appears as though all of there 5 phase motors are in the penta configuration. Also there is a star configuration (Micron I believe) that come with 10 wires.
Oriental motors 5-phase info (bottom of page) they also have a 2 vs 5 phase article which is very informative.
http://www.orientalmotor.com/MotionC...ve-methods.htm
Here is a page showing the star configuration (can't find where I found it before)
http://books.google.com/books?id=TsX...F4GpVHchwCtTfo
Hope some of this info might help in identifying the 10 wires. As for building a 5 phase controller, I hope to in the future and will post any results. For now I have bought a udx5114 controller of ebay (5 phase penta driver) because of time.
Good luck !!