A commutatorless electrical motor comprises a cylindrical magnetic rotor having main magnetic poles where N and S poles are alternately arranged in the circumferential direction, and an axis of N and S poles of each magnet extends radially, and a sub magnetic poles at one end of the cylindrical rotor....http://www.google.fr/patents/US4417186?utm_source=gb-gplus-shareBrevet US4417186 - Commutatorless electrical motor having sub magnetic poles
Commutatorless electrical motor having sub magnetic poles
