Abstract: An alternator includes a generally cylindrical hollow housing with a soft iron outer core mounted therein with teeth projecting radially inwardly therefrom. Each of the outer core teeth has a wire wrapped therearound to form a coil, the coils being connected together and to at least one electrical wire extending out of the housing so as to conduct electricity induced in the coils. A tubular rotor formed of magnets is rotatably mounted on bearings at both ends within the housing, radially inwardly of the outer core and coaxial thereto. Each of the rotor magnets has one pole directed radially outwardly and its opposite pole directed radially inwardly, the magnets being arranged such that the outwardly and inwardly directed magnetic fields alternate around the rotor. A soft iron inner core is connected to the housing and mounted radially inwardly of the rotor. The inner core has teeth projecting radially outwardly therefrom, each tooth having a wire coil.