Study oftheNumberofSlots/Pole Combinations forLowSpeed Permanent Magnet

Thepaper isevaluating themainperformances of thatthedelivered powervaries withthewindspeedatthe thelowspeed, multi-pole permanent magnetsynchronouspowerof3,inanoptimised design thecogging torque should generator provided withfractional, toothconcentrated beless than1.5 - 2.5%fromtherated torque. windings. The constructive aspectsversusrunning Secondly, duetothehighnumberofpolesfractional characteristics ascogging torque andfull load/no-load voltage slots/pole configurations havetobeused.Thiswillalso are presented forsurface mountedpermanentmagnets .. . generators. Appreciations aremadeabout theterminology inthe minimise thecogging torque. Thenumberofslot perpoleand specific field inordertoprevent thewanderofthedefined phaseisintherange of0.25-0.5. Inthis casethephase coils notions fromtheclassical acceptance. Thearmature reactionareso-called tooth-concentrated doublelayer coils, being mmfisanalyzed aselectrical fundamental andfractional space much simpler thanthewindings forinteger slots/pole harmonics andexperimental facts arereported forthesmall configurations. Unfortunately, these windings haverelatively power synchronous generators upto10kW/200 rpm. lowfundamental winding factor andwithanimportant harmonics content thatwillcauseextra-heating, additional Indexing terms: fractional toothconcentrated winding,losses andvibration. magneto-motive force (mmf), permanent magnet, lowspeed Previous works(4)showedthattheelectromagnetic synchronous generator, windenergy conversion properties ofthePM machines arehighly dependent onthe numberofslots perpoleandphase aswelltheshape ofthe