Vehicle alternator and method of manufacture

摘要

A resin fan 233 for a vehicle alternator is provided with a plurality of metal disks 233c which allows the fan to be secured to an end surface of a polar core by welding. The disks 233c are disposed in a circle concentric to the fan and are insertion moulded into the fan. Spherical protrusions 233e which protrude through cylindrical aperture 233d are provided for electrical resistance welding to the polar core.