Nd-Fe-B permanent-magnet rotor is used in a 42V automotive generator. The theory of voltage stability for the permanent-magnet rotor generator is expounded with the relation of armature-reaction reactance, winding leakage reactance and load terminal voltage versus generator speed analyzed. A voltage stabilizer with five-phase semi-control bridge rectification is developed, which integrates the functions of voltage stabilization and current rectification and is composed of reference circuit, comparator circuit, trigger circuit and rectifier circuit. With the voltage stabilizer, the problem of output voltage instability in 42 V permanent-magnet generator at wide ranges of speed and load of vehicle is solved.%在汽车42V发电机中采用钕铁硼永磁转子.阐述了该永磁发电机的稳压原理,分析了其电枢反应电抗、绕组漏抗和负载端压与发电机转速的关系.研制出了集稳压、整流于一体和由基准电路、比较电路、触发电路和整流电路集成的五相半控桥式整流稳压器,解决了汽车用42V永磁发电机在宽转速、宽负载范围内输出电压不稳定的问题.
展开▼
