EP0276009A2 - Dispositif d'indication de la condition d'usure des balais d'une machine électrique - Google Patents

Dispositif d'indication de la condition d'usure des balais d'une machine électrique Download PDF

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Publication number
EP0276009A2
EP0276009A2 EP88100879A EP88100879A EP0276009A2 EP 0276009 A2 EP0276009 A2 EP 0276009A2 EP 88100879 A EP88100879 A EP 88100879A EP 88100879 A EP88100879 A EP 88100879A EP 0276009 A2 EP0276009 A2 EP 0276009A2
Authority
EP
European Patent Office
Prior art keywords
capacitor
signaling
machine
current
wear
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Withdrawn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
EP88100879A
Other languages
German (de)
English (en)
Other versions
EP0276009A3 (fr
Inventor
Dietrich W. Dipl.-Ing. Muth
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.)
STILL GmbH
Original Assignee
STILL GmbH
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 STILL GmbH filed Critical STILL GmbH
Publication of EP0276009A2 publication Critical patent/EP0276009A2/fr
Publication of EP0276009A3 publication Critical patent/EP0276009A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/58—Means structurally associated with the current collector for indicating condition thereof, e.g. for indicating brush wear

Definitions

  • the invention relates to a signaling device with a signaling device for reporting the state of wear of at least one brush of an electrical machine with a slip ring and / or commutator, preferably a direct current machine such as a direct current generator or a direct current motor, with a contact installed in or on the brush upon reaching a predetermined state of wear, closes a signaling circuit in which a current sensor device is arranged.
  • a signaling device with a signaling device for reporting the state of wear of at least one brush of an electrical machine with a slip ring and / or commutator, preferably a direct current machine such as a direct current generator or a direct current motor, with a contact installed in or on the brush upon reaching a predetermined state of wear, closes a signaling circuit in which a current sensor device is arranged.
  • the invention has for its object to provide a universal wear condition signaling device which can be used in particular for industrial trucks with an electric motor drive, for which as few or no additional electrical components are required on the machine and if possible only one line between the slip ring or commutator machine and the signaling device is required.
  • a frequency generator and at least one capacitor are arranged in the signal generator circuit, the capacitance of the capacitor being matched to the frequency of the frequency generator such that these capacitors sator for the current with the frequency determined by the frequency generator is permeable.
  • This has the effect that when the contact closes due to corresponding wear of the brush, the current flows at the frequency determined by the frequency generator.
  • This current can easily be detected in the current sensing device and used to trigger a signal lamp or an acoustic warning sign or the like.
  • the subject of the invention is suitable for single-pole switch contacts lying at brush potential. A particular advantage is the electrical isolation achieved between the signaling device supply, the machine circuit and the individual brushes, which is easy to reach.
  • the signaling device can be combined in one assembly for all slip ring or commutator machines present in an overall assembly, for example in a vehicle, this assembly being attachable anywhere in the vehicle.
  • the detection of the contacting of the monitoring switching contacts takes place via current measurement of an alternating voltage of predetermined, suitably selected frequency that is generated in the signaling device.
  • a slip ring or commutator machine it a motor or a generator
  • the circuit is also closed via capacitors at any point in the circuit of the slip ring or commutator machine, the brushes of which are to be monitored.
  • the capacitor can be used as such in the signaling device Be arranged near the current sensing device, but can also be arranged directly on the slip ring or commutator machine.
  • the device according to the invention is particularly suitable for DC machines, but can also be used for AC machines, provided that only the frequency with which it operates is so clearly different from the frequency of the frequency generator of the device according to the invention that the capacitor is clearly only for this one Frequency is permeable.
  • the frequency generator itself is connected to a current source so that it functions as a current source even for the signal generator circuit.
  • a particular further advantage is the possibility of providing a control option by means of which there is always a check as to whether the device is effective by arranging a further capacitor with a defined resistance or an ohmic resistance in parallel with the brush wear contact and the capacitor arranged on the machine. through which a current flows that is clearly different from the current that flows when the brush wear contact closes, so that it can be continuously determined whether this control current flows or the current triggered by the closing of the brush wear contact flows.
  • This means that the function of the supply lines is constantly checked by means of defined load resistors or load capacitors arranged in the machine, which are selected to be significantly smaller than the capacitors used for electrical isolation.
  • the signaling device is dimensioned so that the defined load current of the load resistors or load capacitors for the display "ready for operation” or a similar display, whereby if this control current fails, for example as a result of a cable break, a "fault” display is triggered, while if the intended normal signaling current, which is actually greater than the function control current, a signal "brush worn” is triggered becomes.
  • the load capacitor or load resistor can also be connected in series with an arbitrarily actuated test button contact.
  • the battery 12 for example the vehicle battery in a vehicle drive, is connected via two lines 16 to the direct current motor, the armature 8 of which is connected in series with the field excitation coil 9.
  • the arbitrarily adjustable pulse control 13 determines the voltage supplying the motor 8, 9 and thus the voltage Engine speed.
  • a wear signaling contact is arranged on each brush, which is symbolized in the circuit diagram by a contact 7, with each of the two brushes being assigned a wear signaling contact 7.
  • a line 17 leads to an isolating capacitor 5, the two isolating capacitors 5 being connected to a line 11 which leads to the actual signaling device 1, the line 11 being connected to a capacitor 15 which is in front of the input a current sensing device 3, which is connected to a signal lamp 4.
  • the current sensing device 3 is connected to a frequency generator 2. Via the line 10, the circuit from the frequency generator 2 via the current sensing device 3, the capacitor 15, the line 11, the isolating capacitors 5, the lines 17 and the wear measuring contacts 7 to the lines 16 and from there via the line 10 to the frequency generator 2 closed.
  • the isolating capacitors 5 cause a galvanic separation of the individual circuits (supply voltage, machine circuit, various brush potentials) as well by the capacitor 15 arranged in the signaling device 1. Both the isolating capacitors 5 and the capacitor 15 are permeable to current of the frequency determined by the frequency generator 2.
  • a further current measuring element 3 with a further signal output 4 is connected to the line between each frequency generator 2 and the current measuring element 3 with the signal output 4, a line 14 being connected to this further current measuring element 3, which line is to be monitored to one or more Slip ring or commutator machine or machines leads.
  • the signal lamp 4 or the signal lamps 4 can also be arranged outside the device 1.
  • the capacitor 15 can be omitted and the isolating capacitors 5 also take on its task. If only one brush and thus one signaling contact is connected, the isolating capacitor 5 can also be omitted and only the capacitor 15 arranged directly next to the current measuring element (current sensing device) 3 must be present and is sufficient.
  • the line 10 is omitted and instead the frequency generator 2 and the line 16 are connected to ground 20, so that the circuit is closed via ground 20. It is sufficient if the line 16 is connected to ground either on the generator 18, 19 or on the motor 8, 9, since the motor 8, 9 and the generator 18, 19 are connected via the line 16. The ground connection is again made via a separating capacitor.

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  • Motor Or Generator Current Collectors (AREA)
  • Dc Machiner (AREA)
EP88100879A 1987-01-21 1988-01-21 Dispositif d'indication de la condition d'usure des balais d'une machine électrique Withdrawn EP0276009A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873701643 DE3701643A1 (de) 1987-01-21 1987-01-21 Meldeeinrichtung fuer das melden des verschleisszustandes von buersten einer elektrischen maschine
DE3701643 1987-01-21

Publications (2)

Publication Number Publication Date
EP0276009A2 true EP0276009A2 (fr) 1988-07-27
EP0276009A3 EP0276009A3 (fr) 1989-07-19

Family

ID=6319217

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88100879A Withdrawn EP0276009A3 (fr) 1987-01-21 1988-01-21 Dispositif d'indication de la condition d'usure des balais d'une machine électrique

Country Status (2)

Country Link
EP (1) EP0276009A3 (fr)
DE (1) DE3701643A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0360197A2 (fr) * 1988-09-21 1990-03-28 Schunk Metall und Kunststoff GmbH Porte-balais

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4003669A1 (de) * 1989-02-20 1990-08-23 Siemens Ag Vorrichtung zum erfassen der laenge der buersten einer elektrischen maschine
DE19743080B9 (de) * 1997-09-30 2004-10-21 Bayerische Motoren Werke Ag Überwachen des Verschleißzustands der Kommutatorbürste des Elektromotors einer Fahrzeugkraftstoffpumpe
DE102017221190A1 (de) * 2017-11-27 2019-05-29 Universität Stuttgart Verfahren und Vorrichtung zur Bestimmung mindestens einer messtechnisch erfassbaren Größe in Bezug auf eine Eigenschaft einer Oberfläche eines Werkzeugs

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3215251A1 (de) * 1982-04-23 1983-11-10 Paul Vahle Gmbh & Co Kg, 4618 Kamen Auf die fortgeschrittene abnutzung der schleifkohle von bestandteil von schleifleitungen bildenden stromabnehmern ansprechender impulsausloeser
DE3417711A1 (de) * 1984-05-12 1985-11-14 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Vorrichtung zur ueberwachung und anzeige des abnutzungsgrads von kohlebuersten in stromrichtergespeisten gleichstrommaschinen
DE3514686A1 (de) * 1985-04-24 1986-11-06 BSG-Schalttechnik GmbH & Co KG, 7460 Balingen Vorrichtung zur meldung eines kohlebuerstenverschleisses

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3215251A1 (de) * 1982-04-23 1983-11-10 Paul Vahle Gmbh & Co Kg, 4618 Kamen Auf die fortgeschrittene abnutzung der schleifkohle von bestandteil von schleifleitungen bildenden stromabnehmern ansprechender impulsausloeser
DE3417711A1 (de) * 1984-05-12 1985-11-14 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Vorrichtung zur ueberwachung und anzeige des abnutzungsgrads von kohlebuersten in stromrichtergespeisten gleichstrommaschinen
DE3514686A1 (de) * 1985-04-24 1986-11-06 BSG-Schalttechnik GmbH & Co KG, 7460 Balingen Vorrichtung zur meldung eines kohlebuerstenverschleisses

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0360197A2 (fr) * 1988-09-21 1990-03-28 Schunk Metall und Kunststoff GmbH Porte-balais
EP0360197A3 (en) * 1988-09-21 1990-10-03 Schunk Metall Und Kunststoff Gmbh Brush holder

Also Published As

Publication number Publication date
DE3701643A1 (de) 1988-08-04
EP0276009A3 (fr) 1989-07-19

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