Abstract: A volumetric measurement apparatus is provided which measures the volume of a liquid material stored within a container. The volumetric measurement apparatus includes a reference enclosure having disposed therein a single pressure sensor. The pressure sensor has a pressure sensitive element exposed to both internal spaces of the reference enclosure and the container to detect a pressure difference between the container and the reference enclosure. A sensor shielding member is arranged in the reference enclosure to selectively shield the pressure sensitive element from the internal space of the reference enclosure to detect only a pressure within the container. The volumetric measurement is made based on the pressure difference between the container and the reference enclosure and the pressure in the container.

Abstract: An armature coil assembly for magnet-type rotary electric machines such as alternators or motors, which comprises flat conductor pieces or segments with large-area sides thereof arranged parallel to the direction of the magnetic fluxes of a permanent magnet, and a ferromagnetic member inserted between the conductor pieces. The ferromagnetic member inserted provides a magnetic anisotropy in the armature coil along the axis of coil rotation, thus the flow of magnetic fluxes from the magnet through the armature coil to the machine core is facilitated thereby to reduce leakage magnetic fluxes. A stator coil assembly is also made up by using like coil conductor segments.

Abstract: There is provided a three-phase flat coil having a disclike outer periphery of an insulating plate and an electrical conductor positioned radially on front and back sides of said insulating plate and having bent-over portions on outer and inner peripheries thereof. Said electrical conductors are the three-phase coil windings including a-phase, b-phase and c-phase windings each wound in a wave form in the same direction and terminating at output terminals on the outer periphery of said plate. The output terminals are located at substantially one point on the outer periphery of said plate. The ends of the b-phase winding at said output terminals are different in polarity from the ends of the a-phase and c-phase windings. Intersections of the said three-phase coil windings are collectively positioned at substantially one point on the outer periphery of said insulating plate.

Abstract: A flat coil for use in a rotary electric machine has an annular row of generally radially extending and circumferentially spaced electrically conductive segments (1) on each annular end face of an electrically insulating base member (2). Each segment has a non-effective section disposed adjacent to the radially inner end of the segment and having a mean thickness greater than that of the remaining sections of the segment to improve the cooling ability of the coil. The segments are formed by punching a blank of thin copper sheet to form therein an annular row of radially extending and circumferentially spaced slits to thereby form an annular row of radially extending and circumferentially spaced segments. Before or after the blank is punched, the blank is subjected to forging, electrolytic plating, electrolyzing treatment or mechanical treatment so that the non-effective section of each segment has a thickness greater than that of the remaining sections.

Abstract: An AC generator includes a pair of cup-shaped housings to accomodate a stationary armature coil and a rotor. The armature coil includes a multiphase windings formed in a flat annular shape having flat surfaces perpendicular to the axis of a rotating shaft of the AC generator, and the flat annular-shaped armature coil is mounted on the pair of cup-shaped housings with the outer peripheral portion of the armature coil fixed between the pair of housings. The rotor includes a pair of discs of magnetic material fixed to the rotating shaft spaced from and opposed to each other interposed therebetween by the flat annular-shaped armature coil. Each of the discs has a plurality of permanent magnets arranged concentrically with the rotating shaft in alternate magnetic polarities on one surface of the disc facing the armature coil, so that magnetic fluxes which rotate with the discs and which link with the stationary armature coil are produced between opposed permanent magnets of the pair of discs.