Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1989-04-04
1990-08-28
Wong, Peter S.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 68R, 363141, 363145, H02K 1100, H02M 100
Patent
active
049528297
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a rectifier supporting device for (three-phase) generators, particularly for use in motor vehicles, buses, trains and the like. Such rectifier supporting devices or--in a narrower sense--the arrangement of heat sinks for rectifier diodes are known in electric generators in multiple forms, wherein the respective positive diodes and the respective negative diodes are usually arranged on separate carrier plates, especially in three-phase generators for use in motor vehicles--this is also a preferred area of use of the present invention, and will thus will be discussed in more detail. The fastening of the diodes in the respective carrier plates, which are, at the same time, heat sinks for these diodes, is usually effected by means of insertion in receiving bore holes of the carrier plates or heat sinks, wherein a secure fastening can be achieved by means of soldering or by means of insertion under pressure. The head wires of the diodes are exposed to the outside and are connected with conductors which usually extend in a circuit board until the respective connection points.
Every diode heat sink is usually constructed in the shape of a circle segment or crescent and is fastened in the same plane as the other diode heat sinks on the edge of the circuit board of carrier plate in which the electric interconnections are located. These interconnections can be wires which are inserted in the plastics material of the circuit carrier plate or also punched sheet metal parts. The basic shape of such rectifier supporting devices is known, for example, from the DE-AS 1 256 303 or DE-OS 27 35 124.
In the known manner of construction and supporting of the heat sinks on the one side of the plastic circuit board, difficulties arise in that only a limited space is available for mounting, which space cannot be optionally expanded in the radial direction in order to increase the surfaces of the heat sinks which dissipate heat, since the external dimensioning of the three-phase generator is predetermined by the stator package and the end shields on both sides.
In addition, the manner of construction which is not always absolutely stable and is therefore not very resistant to vibrations involves particular problems, wherein the plurality of rectifier diodes, e.g. four negative diodes and four positive diodes if the star point is likewise connected, are to be supported and connected on the small available space in addition to the usual three exciting diodes. Reliable contact between the connections of the circuit board and the diodes and between the stator wires and the printed circuit board also involves problems.
In view of the labor required in the production of conventional three-phase generators for motor vehicles, which can be drastically reduced or entirely eliminated by means of the present invention, it was particularly troublesome that e.g. four different conductors had to be inserted and correctly positioned by hand in the injection molding die for the production of the circuit carrier or circuit board, respectively, before the injection molding process could begin. In addition, a separate exciting diode rail with welded diodes and the spring used for the D+ -connection had to be riveted in after the injection molding. The W-connection had to be mounted in an individual work step, wherein the stator wires, which end at a desired location after the winding of the stator windings in the stator grooves, had to be bent into different directions so that their end areas could be guided to the locations where the connection to the printed circuit board was effected. Finally, it was necessary to connect the stator wires separately with one another, also in the star point, and to thread individual insulating tubing on the outwardly guided stator wires.
The object of the present invention is to reliably avoid the previous disadvantages and to drastically simplify both the construction and the mounting processes in the production of such a rectifier by means of a special compact construction and
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Armbruster Franz
Buck Hartmut
Fasterding Henning
Koplin Karl-Heinz
Pubrl Wenzel
LaBalle C. E.
Robert & Bosch GmbH
Striker Michael J.
Wong Peter S.
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