Electricity: conductors and insulators – Conduits – cables or conductors – Combined
Patent
1998-10-16
2000-09-26
Kincaid, Kristine
Electricity: conductors and insulators
Conduits, cables or conductors
Combined
174 65R, 310 68R, H02G 1502
Patent
active
06124550&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of Invention
The invention relates to a device for connecting to a grounding conductor the electrically conductive sheath of an electric lead laid in the slots of the inductor of a linear motor.
2. Description of Related Art
DE-C 30 06 382 has already disclosed a three-phase AC winding for the inductor of a linear motor, in which the leads of the individual winding phases are permanently joined together mechanically during preproduction and are then laid in the slots of the inductor. The mechanically permanent joint can be realized in this case by means of clamps which hold the leads together on the winding overhangs and simultaneously produce an electric connection between the lead sheaths and the grounding conductor which is guided along the inductor past the winding overhangs.
The task of the grounding conductor is to connect the electrically conductive sheath of the individual leads to the three-phase AC winding to earth potential in order to discharge capacitive charging currents, to detect earth faults and to permit fault localization. The aim is also to ensure protection against the risk of touching the leads.
However, it has emerged that joining the grounding conductor by means of the clamping joint described to the winding overhangs does not ensure a continuously low contact resistance in the case of long-term operation of the three-phase winding as well, because corrosion can occur at the clamping points owing to environmental influences.
BRIEF SUMMARY OF THE INVENTION
It is therefore the object of the invention to specify a device for connecting to a grounding conductor the electrically conductive sheath of an electric lead, which is largely free from corrosion and does not complicate the fitting of the lead.
The invention achieves this object by means of a metal shell, which encloses more than half the outer circumference of the lead in the slot region, whose inside diameter is slightly smaller than the outside diameter of the lead, and which can be fastened in the respective slot in a fashion lying against the inductor.
The invention renders it possible to establish electric contact via the metal shell with the lead over a relatively long section in each case by laying it in the metal shell. Since the inside diameter of the metal shell is slightly smaller than the outside diameter of the lead, a first seating of the metal shell on the outer sheath of the lead is produced, with the result that it can then be fastened, possibly together with the lead lying in it, in a slot of the inductor. The lead is held fast in the metal shell, because it is firmly enclosed by it on a circumferential section of more than 180.degree.. This type of mounting is independent of an electric connection between the metal sheet and the grounding conductor. It is also possible to lay the lead in the metal shell after the latter has been fastened in a slot in the inductor.
The metal shell can be as long as the slot. However, it one end of the metal shell projects somewhat beyond the slot in the longitudinal direction thereof, it is possible there to produce a connection of the grounding conductor in a very simple way, it being possible to use corrosion-resistant clamping screw connections, or else welds. The latter type of connection is suitable, in particular, for a metal shell which does not project beyond the slot or also is shorter than the latter.
The metal shell can be fastened in the slot by means of screws or clamping elements. However, the metal shell is preferably resilient and has outwardly bent longitudinal edges whose width and angle of curvature are dimensioned such that when pressed into the slot they spread against the inner walls thereof. As a result, it is possible to mount the metal shell very easily together with the lead lying in it, because this unit can be pressed into the slot, the two outwardly being longitudinal edges sliding along the inner walls of the slot and being spread apart by the elasticity of the metal shell upon termination of the pressing-in
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Funken Peter
Heinen Karl-Hans
Kuepach Hermann V.
Loser Friedrich
Vogt Jurgen
Felton & Guillaume Kabelwerke GmbH
Kincaid Kristine
Mayo, III William H
Thyssen-Transrapid System GmbH
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