In a heat-dissipating fan device, a fan impeller has a spindle mounted rotatably in a fan housing. A first magnetic ring member is disposed around a first stator coil mounted securely in the housing, and is coupled co-rotatably to the fan impeller such that a magnetic field induced by an external electrical...http://www.google.com/patents/US7029247?utm_source=gb-gplus-sharePatent US7029247 - Heat-dissipating fan device with light-emitting capability
