(JP8154369-A)      The machine has stator windings (1, 2) accommodated in the same slot of a stator iron core (3) and a field winding (4) accommodated in a slot of a rotor iron core (5). The cylindrical rotor is fixed to a rotation axis to have a predetermined narrow gap between the stator and the rotor and is supported on bearings (7, 8). Laminated cores are used to reduce eddy currents.    A mechanical modulator generates a multiphase amplitude-modified voltage from the AC voltage as a carrier voltage. The modulator rotates in synchronism with the modulation motor. The field winding is connected to the AC power source and the stator windings are connected to a load, typically a pair of thyristors.    USE/ADVANTAGE -   For electric car, electric automobile, fluid control device, pumped storage power generating plant, tidal power generating system, and vibration preventing structure of multi-storey building. Overcomes the problems of conventional AC machines for control and power generation with improved efficiency.    (EP704963-B1)      The machine has stator windings (1, 2) accommodated in the same slot of a stator iron core (3) and a field winding (4) accommodated in a slot of a rotor iron core (5). The cylindrical rotor is fixed to a rotation axis to have a predetermined narrow gap between the stator and the rotor and is supported on bearings (7, 8). Laminated cores are used to reduce eddy currents.    A mechanical modulator generates a multiphase amplitude-modified voltage from the AC voltage as a carrier voltage. The modulator rotates in synchronism with the modulation motor. The field winding is connected to the AC power source and the stator windings are connected to a load, typically a pair of thyristors.    USE/ADVANTAGE -   For electric car, electric automobile, fluid control device, pumped storage power generating plant, tidal power generating system, and vibration preventing structure of multi-storey building. Overcomes the problems of conventional AC machines for control and power generation with improved efficiency.