Verfahren zur Herstellung von magnetischen Rotorteilen

摘要

A rotor for an alternating current generator of the Lundell type has a shaft (24) which carries two segments (10,12) which have interleaved pole teeth (14,36). The rotor has a core (18) and a field coil (42) disposed about the core (18). The segments (10,12) and/or core (18) are formed of compressed powder iron particles having a particle size in a range of about 10 to 250 micrometres. In the manufacture of the core (18) and/or segments (10,12) the iron powder particles are coated with a thermoplastics material and this thermoplastic coated iron particle material is compacted in the moulding dies of a press. After compaction to the desired shape, the part is sintered at a temperature of about 1121 DEG C (2050 DEG F) to burn off the thermoplastic material coating the iron particles.