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Based on comparative study on different pole-slot number combinations and pole-arc coefficients for the 1.5MW directdriven PM wind generator. the following conclusions can be deduced: 1) The pole-slot number combination has significant effect on the positioning torque at no load. Choosing the fractional slot number per pole and per phase is an effective approach to reduce the positioning torque. The positioning torque reduces along with the increment of denominator of the fractional slot number per pole and per phase. However. the effect of pole-slot number combinations on the cogging torque at load condition is not as large as that at no load. 2) The average and fluctuate of the output power increase along with the decrement of the pole number for the same slot number. The average and fluctuate of the output power increase also along with the increment of the slot number for the same pole number. 3) The output power and cogging torque increase along with the increment of the pole-arc coefficient for a fixed poleslot number combination.
