Abstract: An electrical machine includes both a permanent magnet source of field excitation and an electromagnetic source of field excitation. The electrical machine also includes a homopolar rotor, which carries the permanent magnet source, and a lamination stack having a middle portion and outer portions. The homopolar rotor and the middle portion of the lamination stack conduct flux generated by the permanent magnet source. The homopolar rotor and the outer portions of the lamination stack conduct flux generated by the electromagnetic source when the electromagnetic source is energized.

Abstract: An electrical machine, especially a generator for vehicles, having a rotor rotatably supported in a stator housing is proposed, the rotor having an exciter winding (24), disposed in a manner fixed against relative rotation coaxially to a rotor shaft, the winding ends (26, 28) of the exciter winding being extended to wiper rings disposed on the rotor shaft. For the sake of simple centrifugal force-proof fixation of the exciter winding, it is provided that the exciter winding (24) is disposed on a winding carrier (11), which has means (32, 33) for firmly clamping the winding ends (26, 28) (FIG. 2).

Abstract: A magnetic attraction driving engine utilizing a permanent magnet is provided with a permanent magnet, an electromagnet formed by winding a coil on a magnetic core with one end thereof stuck to one magnetic pole end of the permanent magnet, an excitation controller for exciting the electromagnet to change a state of magnetic fluxes in the vicinity of the magnetic pole end of the permanent magnet, a movable member having magnetic attractivity set in the vicinity of the magnetic pole end of the permanent magnet by being supported and guided so as to be capable of coming close to or separating away from the permanent magnet and a returning force applying member for causing by pressure the movable member to retreat against a magnetic attracting force and move back and forth by changing a magnetic attracting force of the permanent magnet.

Abstract: A bridge rectifier for an alternator comprises a first heat sink for being secured to a frame of an alternator; a second heat sink disposed on top of the first heat sink; an electrical insulator disposed between the first and second heat sinks; a first group of diodes operably secured to the first heat sink; a second group of diodes operably secured to the second heat sink; an insulating support operably secured to the second heat sink, the support including a plurality of legs adapted to be received in respective holes in the second heat sink; a plurality of screws adapted to be received axially by respective legs, the screws being adapted to expand the legs radially, thereby to lock the legs in respective holes; and a plurality of electrical connectors each being operably connected to a respective pair of diodes, each pair comprising a diode from the first group and a diode from the second group, each of the plurality of electrical connectors for being operably connected to the alternator, each of the plura