A motorcycle stator is the stationary part of the alternator. The flywheel, or magnet rotor, rotates around the stator to generate sufficient AC power for the motorcycle's ignition system.
A motorcycle stator has between four and 18 spokes arranged in a circular fashion. Copper magnet wire is wound around each spoke, and this is what permits the permanent magnets attached to the flywheel to generate power as they spin around the stator and its spokes. The power generated by the stator is channeled to charge the motorcycle's battery. On some bikes, the stator provides all of the power needed for the ignition system without the need for a battery. The original kinetic energy required to start such bikes comes from a foot-powered kick starter.