Ferrite Permanent Magnets for an IPM Rotor

Yes....

http://www.novatorque.com/aboutus/white-papers/060_John_Petro_final_paper.pdf

http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=6349955&url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D6349955

Your question is vague. What is your prototype not doing? Not spinning, not reaching design speed, not taking design load, not providing design torque, drawing too much power, etc., etc.

Why do you place the blame on the magnets, do you know if the drive electronics are working right? Sounds like your team is working on a lab experiment for a machines course, we don't do home/labwork here (though we might help if we see that you're really stumped).

Which is the PM magnetic curve (B-H) you considered in your design ?

Best would be you show a picture with it. When using ferrite PM one should consider the working point at assembly and corresponding working line if the PM was not magnetised in assemblied position.

For Neodym the B-H and the reverse curves are almost the same so this corresction has not to be considered.