But does'nt it bring many advantages applying overlapping coils?
I also want to buy new magnet sizes.
All that matters is that the coils be electrically useful. for air core coils, as i have explained, you need to overlap the coils and by doing so you can fit basically twice as much copper in your machine.
once you add a magnetic core, all that matters is that the coils be electrically useful and you fit as much copper as possible in the core.
anyhow, due to the aspect ratio of your core i think a concentrated pole design will be more efficient, due to the reduced end turn length.
if you go with the regular 3 tooth 1 magnet ratio, your end turns are three times the length of the active winding. basically 75% of the copper is wasted.
with a concentrated pole design, only half of the copper isn't doing anything, if you wind every other tooth.
if you wind every tooth, your end turn length will be somewhat but you'll have twice as many coils to wind.
(that's why i asked what did you do with the rest of the core)