Electric-machine-rotor having field coil and auxiliary permanent magnets and method of manufacturing the same

摘要

An electric-machine rotor (3) is composed of a field coil (8), a pair of pole cores (7) having a plurality of claw poles (15, 16) to enclose the field coil (8), a plurality of auxiliary permanent magnets (51) disposed between the claw poles (15, 16), a shaft (6) fixed to the pair of pole cores (7), and a pair of slip rings (9, 10) connected to the field coil (8). The rotor (3) is provided with a pattern on a surface of the pole cores (7) for indicating the polarity of the claw poles (15, 16) when the field coil (8) is energized.