Making an AC generator with easy winding. 

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By increasing the cost more, increasing the production of electricity more

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@@newstar01 👍

thank you

Thank you for your good comment Yes, it would be interesting to use electromagnetic, but here the purpose is to use a permanent magnet The use of aluminum causes reduced magnetic flux because: Aluminum cores have lower magnetic permeability compared to iron cores. This leads to a reduction in magnetic flux. Consequently, the efficiency of the generator decreases due to the reduced magnetic flux. Increased Ohmic Losses: Aluminum cores have higher electrical resistance than iron cores. This results in an increase in ohmic losses.

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Yes, they have four double rows Four rows of N poles and four rows of S poles

Yes, they are closed in series

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