About the only reason I can figure that the motor manufacturers would use aluminum would be cost. Having replaced one of the motors, I can tell you that the new motor is identical to the old. I just had never come across this before, that is why I asked if anyone else had.
Now, the real question is, will coils made from this wire need to be wound different for my project? What I am attempting to build is a type of pulse generator, for a set of flashing lights, the pulse rate to be determined by ground speed on my bicycle.