| 摘要 |
1,246,640. Inductor alternators. ROBERT BOSCH G.m.b.H. 2 Oct., 1968 [3 Oct.., 1967], No.46666/68. Heading H.2A. An A.C. generator comprises two spaced, toothed ferromagnetic discs 37, 38, Fig. 2, mounted on a common shaft, the teeth on each disc adopting in use the same polarity, the discs being magnetically connected by a yoke piece 35, and a substantially annular assembly of stator laminations 25 surrounding the shaft and carrying stator windings 27, and a stationary field coil 30 mounted radially within the stator laminations, the arrangement being such that in use the flux passing through those parts of the laminations located within the windings 27 continually changes direction. The stator windings are uniformly spaced round the laminated assembly with their axes disposed circumferentially, and the pitch of the rotor teeth is at least twice that of the stator windings, the teeth on the two rotor discs being offset by half a tooth pitch. As the rotor teeth 11, 12, Fig. 1, pass the stator, an alternating flux is produced in the part 18 of the laminations located within the stator windings. The laminated assembly is located between the rotor discs, Fig. 2, or radially outside them, Fig. 3 (not shown). The windings 27 are either located in radial slots or are located between polepieces mounted on the laminated assembly. The polepieces may be of one piece or multi-piece construction, solid or laminated and the laminated assembly may be of trapezoidal cross-section and may comprise flat wound or edge-wise wound strip or may be of wound wire (all depicted in Figs. 4 to 14, not shown). Recesses are provided in the stator to accommodate rectifier diodes for the field coil. The rotor discs and yoke piece may be solid or laminated and the stationary assembly of stator windings, laminations and field coil is impregnated with varnish. The generator is driven by a belt and is mounted by a pivotal support 45 for tensioning the belt. |
