Pulse generator having index angles formed by permanent magnet rotor

A pulse generator comprising a rotor assembly having a center and a stator assembly disposed coaxial with said rotor assembly, said rotor assembly comprising a permanent magnet which comprises a plurality of magnetic poles arranged circularly at said center of said stator assembly, each pair of the adjacent magnetic poles bearing magnetic polarities opposite to each other, each of said magnetic poles having two ends which define an index angle at said center of said stator assembly, said stator assembly comprising a plurality of stator coils arranged circularly in total at said center of said rotor assembly and each of said stator coil being directed toward said permanent magnet, a gap between each pair of the adjacent stator coils defining a pitch, wherein said index angles are set to be unequal to each other, and said pitches are set to allow said stator coils to electromagnetically match the corresponding magnetic poles only once per revolution of said rotor assembly.