Study of the Number of Slots/Pole Combinations for Low Speed Permanent Magnet Synchronous Generators

The paper is evaluating the main performances of the low speed, multi-pole permanent magnet synchronous generator provided with fractional, tooth concentrated windings. The constructive aspects versus running characteristics as cogging torque and full load/no-load voltage are presented for surface mounted permanent magnets generators. Appreciations are made about the terminology in the specific field in order to prevent the wander of the defined notions from the classical acceptance. The armature reaction mmf is analyzed as electrical fundamental and fractional space harmonics and experimental facts are reported for the small power synchronous generators up to 10 kW/200 rpm.