DE19731805A1 - Device to avoid flashovers with delivery trucks containing drive with AC transformer - Google Patents

Device to avoid flashovers with delivery trucks containing drive with AC transformer

Info

Publication number
DE19731805A1
DE19731805A1 DE19731805A DE19731805A DE19731805A1 DE 19731805 A1 DE19731805 A1 DE 19731805A1 DE 19731805 A DE19731805 A DE 19731805A DE 19731805 A DE19731805 A DE 19731805A DE 19731805 A1 DE19731805 A1 DE 19731805A1
Authority
DE
Germany
Prior art keywords
transformer
delivery trucks
housing
containing drive
avoid flashovers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE19731805A
Other languages
German (de)
Inventor
Karl-Ernst Mueller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Priority to DE19731805A priority Critical patent/DE19731805A1/en
Publication of DE19731805A1 publication Critical patent/DE19731805A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0069—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to the isolation, e.g. ground fault or leak current
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train

Abstract

A device to avoid flashovers with delivery trucks containing a drive with an AC transformer has a shunt resistance (5) located between the housing of the truck and the primary side of the transformer, ie one pole of the multiphase transformer.

Description

Die Erfindung bezieht sich auf eine Vorrichtung zur Vermeidung von Überschlägen bei Förderfahrzeugen mit einem einen Wechselstrom-Trafo enthaltenden Antrieb.The invention relates to a device for preventing rollovers for conveyor vehicles with a drive containing an AC transformer.

Es sind derartige Förderfahrzeuge bekannt, bei denen zusätzlich ein Nulleiter vor­ gesehen ist und die Überschläge vermieden werden, indem eine elektrische Ver­ bindung zwischen dem Gehäuse des Förderfahrzeugs bzw. anderen spannungsfüh­ renden Teilen und dem Nulleiter besteht. Bei Förderfahrzeugen ohne Nulleiter, bei­ spielsweise bei derartigen mit einem Schutzkleinspannungssystem von z. B. 48 V existiert ein derartiger Nulleiter nicht. Derartige Fahrzeuge müssen erdfrei betrieben werden. Das führt insbesondere bei einer ungünstigen Materialkombination von Untergrund und den Antriebs- und Laufrollen des Förderfahrzeugs zu einer elektro­ statischen Aufladung, die bei einem Berühren des Gehäuses zu den bekannten elektrostatischen Ableitungen führen.Conveyor vehicles of this type are known, in which a neutral conductor is additionally provided is seen and the arcing can be avoided by an electrical Ver bond between the housing of the conveyor vehicle or other voltage parts and the neutral conductor. In the case of conveyor vehicles without neutral conductor, at for example in such with a protective low voltage system of z. B. 48 V. there is no such neutral. Such vehicles must be operated floating become. This leads in particular to an unfavorable combination of materials Underground and the drive and rollers of the conveyor vehicle to an electro static charge, which when touching the housing to the known electrostatic discharges.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung der eingangs genannten Art zu schaffen, bei der elektrostatische Aufladungen von Förderfahrzeugen mit erdfrei betriebenen Schutzkleinspannungssystem vermieden sind.The invention has for its object a device of the aforementioned Art to create when using electrostatic charges on conveyor vehicles floating protective low voltage system are avoided.

Die Erfindung löst diese Aufgabe durch die Merkmale des Patentanspruchs 1.The invention solves this problem by the features of claim 1.

Durch den Ableitwiderstand werden gegebenenfalls entstehende elektrostatische Aufladungen unmittelbar bei ihrem Entstehen abgeleitet. Es kann somit nicht zu dem unerwünschten plötzlichen Entladen, insbesondere bei einem Berühren durch einen Bediener führen. Dadurch ergeben sich erhebliche Vorteile hinsichtlich der Arbeitssicherheit und auch hinsichtlich des Schutzes von Elektronikkomponenten an Bord des Förderfahrzeugs. The discharge resistance can cause electrostatic charges Charges derived immediately when they arise. So it can't the unwanted sudden discharge, especially when touched by guide an operator. This gives significant advantages in terms of Occupational safety and also with regard to the protection of electronic components Board the conveyor vehicle.  

Bei einem mehrphasigen Wechselstromtrafo kann die Erfindung auf unterschiedli­ che Weise realisiert sein. Es ist dabei möglich, zu jedem der Pole einen Ableitwi­ derstand zu legen. Demgegenüber ergibt sich eine deutliche Verringerung des Auf­ wands, wenn nur zu einem der Pole eine elektrische Verbindung vom Gehäuse des Flurförderfahrzeugs über den Ableitwiderstand besteht.In the case of a multi-phase AC transformer, the invention can be different che way be realized. It is possible to assign a lead to each of the poles to lay the ground. In contrast, there is a significant reduction in the up if only one of the poles has an electrical connection from the housing of the Industrial truck over the discharge resistance exists.

Anhand der Zeichnung ist die Erfindung weiter erläutert. Es zeigt
die einzige Figur einen Ausschnitt aus dem Schaltplan eines überschlagsfreien För­ derfahrzeugs.The invention is further explained on the basis of the drawing. It shows
the only figure is a section of the circuit diagram of a rollover-free conveyor vehicle.

Ein Bodentransportsystem mit Energieversorgung und Lenkung eines Förderfahr­ zeugs (nicht dargestellt) enthält als Antrieb einen Elektromotor 1, der über einen zweiphasigen Wechselstromtrafo 2 mit Hochspannungsenergie versorgt ist. Primär­ seitig sind Stromschienen 3 mit einer Wechselspannung von jeweils 48 V vorgese­ hen, die über Kontaktbürsten 4 mit den Polen des Trafos 2 primärseitig in Verbin­ dung stehen.A ground transport system with energy supply and steering of a conveyor vehicle (not shown) contains as drive an electric motor 1 which is supplied with high-voltage energy via a two-phase AC transformer 2 . On the primary side there are busbars 3 with an alternating voltage of 48 V each, which are connected via contact brushes 4 to the poles of the transformer 2 on the primary side.

Das Förderfahrzeug besitzt Laufrollen (ebenfalls nicht dargestellt), die aufgrund ihrer Bewegung zu elektrostatischen Aufladungen des Fahrzeug-Gehäuses führen. Um derartige Aufladungen sicher abzuleiten, befindet sich ein elektrischer Wider­ stand 5 zwischen dem Gehäuse und einem primärseitigen Pol des Trafos 2. Dieser Ableitwiderstand 5 besitzt einen elektrischen Widerstand von 4,7 MΩ. Dadurch wird es möglich, die Isolationsanforderungen von etwa 100 kΩ (2 kΩ/V) zu erfüllen und trotzdem eine hinreichende Ladungsableitung herbeizuführen.The conveyor vehicle has rollers (also not shown) which, due to their movement, lead to electrostatic charging of the vehicle housing. In order to safely discharge such charges, there is an electrical resistance 5 between the housing and a primary-side pole of the transformer 2 . This bleeder resistor 5 has an electrical resistance of 4.7 MΩ. This makes it possible to meet the insulation requirements of around 100 kΩ (2 kΩ / V) and still achieve sufficient charge dissipation.

Auch im Langzeitbetrieb zeigt es sich, daß elektrostatische Ableitungen nicht mehr auftreten. Damit ist ein wirksamer Schutz vor Überschlägen gewährleistet.Even in long-term operation, it turns out that electrostatic discharges are no longer occur. This ensures effective protection against flashovers.

Claims (2)

1. Vorrichtung zur Vermeidung von Überschlägen bei Förderfahrzeugen mit einem einen Wechselstrom-Trafo enthaltenden Antrieb, dadurch gekennzeichnet, daß ein Ableitwiderstand (5) zwischen dem Gehäuse des Förderfahrzeugs und der Primärseite des Trafos (2) angeordnet ist.1. Device for avoiding rollovers in conveyor vehicles with a drive containing an AC transformer, characterized in that a discharge resistor ( 5 ) is arranged between the housing of the conveyor vehicle and the primary side of the transformer ( 2 ). 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Ableitwi­ derstand zwischen dem Gehäuse und einem Pol des mehrphasigen Trafos (2) angeordnet ist.2. Apparatus according to claim 1, characterized in that the Ableitwi resistance between the housing and a pole of the multi-phase transformer ( 2 ) is arranged.
DE19731805A 1997-07-24 1997-07-24 Device to avoid flashovers with delivery trucks containing drive with AC transformer Withdrawn DE19731805A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19731805A DE19731805A1 (en) 1997-07-24 1997-07-24 Device to avoid flashovers with delivery trucks containing drive with AC transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19731805A DE19731805A1 (en) 1997-07-24 1997-07-24 Device to avoid flashovers with delivery trucks containing drive with AC transformer

Publications (1)

Publication Number Publication Date
DE19731805A1 true DE19731805A1 (en) 1999-01-28

Family

ID=7836738

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19731805A Withdrawn DE19731805A1 (en) 1997-07-24 1997-07-24 Device to avoid flashovers with delivery trucks containing drive with AC transformer

Country Status (1)

Country Link
DE (1) DE19731805A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2312469B1 (en) * 1973-03-13 1974-08-22 Siemens Ag, 1000 Berlin Und 8000 Muenchen Electrical device with highly sensitive electronic components, which has means for discharging the static electricity of the maintenance personnel
DE3111021C1 (en) * 1981-03-20 1982-11-11 Siemens AG, 1000 Berlin und 8000 München Protection device against electrostatic charges for Class II insulated (fully insulated) electrical apparatuses
US4523252A (en) * 1982-04-27 1985-06-11 J-O Wallen Electronic Int. Ab Device for eliminating static electricity
DE29509061U1 (en) * 1995-06-01 1995-09-14 Hasenbach Lorenz Gmbh Co Kg Roll ladder

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2312469B1 (en) * 1973-03-13 1974-08-22 Siemens Ag, 1000 Berlin Und 8000 Muenchen Electrical device with highly sensitive electronic components, which has means for discharging the static electricity of the maintenance personnel
DE3111021C1 (en) * 1981-03-20 1982-11-11 Siemens AG, 1000 Berlin und 8000 München Protection device against electrostatic charges for Class II insulated (fully insulated) electrical apparatuses
US4523252A (en) * 1982-04-27 1985-06-11 J-O Wallen Electronic Int. Ab Device for eliminating static electricity
DE29509061U1 (en) * 1995-06-01 1995-09-14 Hasenbach Lorenz Gmbh Co Kg Roll ladder

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
08064383 A *
JP Patents Abstracts of Japan: 5-112189 A.,M-1470,Aug. 27,1993,Vol.17,No.472 *

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8139 Disposal/non-payment of the annual fee