Electric machine with fan driven by magnetic coupling, uses fan wheel that is free to rotate on rotor shaft, with magnetic coupling to rotor to allow slippage at high speed

摘要

The alternator has a rotor (10,12) which drives a coaxial fan wheel (16). The fan wheel is mounted so it is free to rotate on the rotor shaft (14) and is driven in rotation by magnetic coupling (30,36) between the rotor and the fan wheel.