What do turns do? If you have made it this far you may be curious in how the number of turns and wire strands effect motors (like a 12turn triple).  First a 12T double is a motor would be wound in the following fashion. The motor winder or machine would take two separate pieces (hence the term double) of the same gauge wire and wrap those two pieces of wire around the first pole 12 times, then the second pole 12 times, then the third pole 12 times, explaining the term 12 turns.
Fewer turns means less total wire length in each coil, plus the wire diameter is generally larger. The net result is a lower resistance armature. For example lets assume a 12 turn motor has 30 inches of 21 AWG wire. 21 AWG wire has a resistance of a .00107 Ohms per inch for a coil resistance of .0321 Ohms as compared to our 27 turn stock motor with .086 Ohms of resistance. Time for a couple of equations - Power = Torque * RPM
- Power = Voltage * Current
A modified motor produces more power since it has a lower armature resistance allowing more current to flow at the same voltage. Even though the lower turn (modified) motor has a lower resistance armature (since it has less total wire length in each coil) it will have less torque than a stock motor (since it has a lower magnetic field). The equations leave you with the obvious, much higher RPM with the modified. Note that the relationship between turns and performance is not linear, the difference between a 12 and 13 turn motor is more noticeable than the difference between an 18 and 19 turn motor. If you think about it, it makes sense since the change in wire length as a percentage of the total length is larger when you have less turns to start with. What about Winds? Now that turns are out of the way, its time to discuss winds like single, double, triple, etc. The wind number is a description of the number of strands of wire that are used in each turn. Higher winds have a larger cross-sectional area than a single-strand wind (more strands will give more area). These high wind armatures will have less resistance and its magnetic field will increase. It will produce a little more torque and also a little more RPM throughout its performance envelope. Look at the picture and you can see each pole on the armature has two wires going to it (double) and if you could unwind this motor it would also have 12 winds. The reason to use a single strand wind really is not about torque or RPM, it has to do with acceleration. Copper is heavy, and the more copper that is in a motor the longer it will take to get up to any RPM. If you need lots of acceleration then a single wind is the way to go. | 
