Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1997-02-24
1998-10-13
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 50, 310 68R, 310 71, 310239, 310240, 310241, 310242, H01R 3936, H02K 1300
Patent
active
058216634
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a power supply configuration for an electric motor with four brushes.
BACKGROUND OF THE INVENTION
Frequently, mainly in the case of direct-current motors that operate at high current strengths, the collector is wired with four carbons, of which in each case two are connected in parallel. Only such a configuration ensures good operating reliability.
To be able to contact the four brushes, EP 0 291 765 B1 proposes providing two conductor rails that have been punched out of sheet metal and contacting two brushes at a time with a conductor rail.
In addition, it is proposed that, in each case, a conductor rail and the corresponding brushes be arranged on, in each case, one support plate and then that the two partial support plates be plugged together, in such a way that the brushes and the corresponding conductor rails are arranged in two different planes. It is readily evident that this leads to a greater axial overall length of the electric motor.
DE-OS 39 36 672 specifically proposes arranging all four brushes on a support plate in one plane but does not call for allowing the power to be supplied via punched-out conductor rails, but rather via flexible lines that are laid on the support plate. Here, the obvious disadvantage exists that the installation of the power supply is expensive since at least four lines must first be cut to length and their insulation stripped and then they have to be placed on the support plate in corresponding holding loops.
The invention is therefore based on the object of developing a system that consists of four brushes and especially the corresponding power supply. The system is supposed to extend quickly in the axial direction and be easy to install.
SUMMARY OF THE INVENTION
In order to accomplish the above object, it is proposed that a power supply configuration be designed in such a way that two conductor rails are provided, whereby each conductor rail is contacted by two brushes each. The conductor rails are arranged in one plane, whereby a contact lug is molded over a bend in at least one conductor rail, in such a way that the lug can be bent up from the plane of the conductor rail. In addition, the lug (bridge lug) is shaped in such a way that after being bent up, one arm of the lug extends away over the other conductor rail.
The stranded conductor of the corresponding brush can now be fastened to this arm in a conducting manner, without the danger existing that the stranded conductor will contact the other conductor rail.
In addition, it is proposed that additional lugs that can also be bent out from the conductor rail plane be molded onto the conductor rails.
This has the advantage that the stranded conductors of the brushes are run out from the conductor rail plane in such a way that no additional insulation of the stranded conductors is needed to avoid short circuits.
In each case, the conductor rails form semicircles that are connected to one another via contact bridges and thus form closed circles. After the rails are fastened to the brush holder plate, the contact bridges are penetrated, in such a way that the two rails are electrically insulated from one another.
The rails are punched out from sheet metal together with the contact lugs, whereby in the punched-out mold, the bridge lug points outward, while the three other lugs point inward. This ensures economical use of materials.
After the conductor rails and the brush holder are installed on a support plate, the brush holders are all located within the circle that is formed by the two conductor rails.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is to be explained in more detail below based on an embodiment, depicted in two figures where:
FIG. 1 shows the conductor rail system that is punched-out from sheet metal; and
FIG. 2 shows the top view of a support plate with the power supply system and the brush holders that are depicted in FIG. 1.
DETAIL DESCRIPTION OF THE INVENTION
The power supply system consists of a first rail 1 and a second rail 2. Bot
REFERENCES:
patent: 4673837 (1987-06-01), Gingerich et al.
patent: 4746829 (1988-05-01), Strobl
patent: 4845396 (1989-07-01), Huber
patent: 4896067 (1990-01-01), Walther
patent: 4926075 (1990-05-01), Fushiya et al.
patent: 4978876 (1990-12-01), Koster
patent: 4983872 (1991-01-01), Strobl
patent: 5138212 (1992-08-01), Wong et al.
patent: 5196747 (1993-03-01), Kress et al.
patent: 5280210 (1994-01-01), Kress et al.
Kiehnle Gunther
Walther Bernd
Enad Elvin G.
ITT Automotive Europe GmbH
Stephan Steven L.
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