You can leave half out again and only use 12 with 4 times the number of turns and then it will fit on a single layer without overlapping.
If you have 24 coils in a single layer it's not going to be much good.
Flux[ Parent ]
I have recently seen this one ...."You can leave half out and use 24 coils with double the number of turns over the same polarity magnets." ....on the AWP windings. (7 coils cooked from corrosion). It is a six layer winding using 30 magnets and 90 coils (55 turns), but I found that it is really 30 magnets and 45 coils (110 turns).
It could have been wound with only 45 coils but they elected to wind two coils on top of each other rather than 1 of twice the turns.
The good thing about this setup, is all the coils are wound the same direction.
Is this consequent wound?
.........oztules Flinders Island Australia[ Parent ]
We only need to consider the single phase case here so a full winding would have 30 coils and because each alternate coil was covered with a magnet of different polarity you would need to reverse alternate coils ( SFFS etc).
If you remove half the coils and leave 15 all over the same magnet polarity it still works ok and the coils remaining are connected in series without reversal ( NSNS etc). You can increase the turns to compensate the voltage and you have the extra winding space to use thicker wire.
If this is a closed iron circuit ( which it is)and you feed a dc current into the winding you will have identical poles over the centres of the coils. The flux has to complete the path and it will return via the spaces between the poles produced. There will be consequent or phantom poles formed between the poles at the centre of the coils and it will behave exactly as a 30 pole winding although you have 15 coils.
Both winding schemes are used commonly, N.America tends to favour the consequent pole winding while Europe probably has more small machines wound with full coil in a 2 layer winding. There is negligible difference and often rewind companies will change the method to suit their facilities. For hand winding many go for the consequent winding, whereas those with winding formers may go for the 2 layer winding where all coils are the same.
