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Chapter 5: Quadcopter Propulsors 97
Figure 5.3 BLDC 12-pole wire-wound stator.
The other main motor part is the stator, which is made up of wire-wound coils that wrap
around an iron core. Figure 5.3 is a photo of a 12-pole stator similar to the ones used in the
Elev-8 motors.
It is important to note that there are 14 poles on the rotor and 12 poles on the stator. The
difference in pole numbers is crucial to starting and maintaining motor rotations. The rotor
would otherwise lock up and not rotate if the number of poles on the rotor and stator were
equal. Figure 5.4 is an end view of an assembled A2212/13T motor that clearly shows the
displacement between rotor and stator poles that ensures the motor will rotate.
Figure 5.4 End view of the A2212/13T 1000KV motor.
