Its all about winds this is one of the most difficlut things to exspain in the world but in your cas eit is made slightly easier.
In a 15t known as a single motor, the piece of copper wire is wrapped around the armature 15 times .
A 15x2 is known as a 15 double which means there is 2 pieces of wire wrapped around the armature 15 times.
And so on for a tripple anda quad which means 3 and 4 pieces of wire are used.
Hope thie helps
A
In thery the 15t should be slightly quickers than the 15x2
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