Dynamoelectric machine, esp. for car - has salient pole laminated rotor with permanent magnets between poles plus extra slip ring-fed excitation winding

摘要

An electrical machine with a wound stator and a salient pole rotor has the rotor made from laminations with permanent magnets sandwiched between the poles. In addition, there is an excitation winding on the rotor, supplied through slip rings. The leakage path for the magnetic flux through the rotor iron is influenced by the excitation to the rotor winding, which can either enhance or detract from the main flux. The permanent magnets are rectangular in cross-section and are retained at their outer radius by the edges of the pole shoes. At their inner radius, they sit on the edges of the excitation winding coils. ADVANTAGE - Can be used as either generator or motor and has improved controllability over large power range.