+

WO2018196924A1 - Dispositif et procédé pour compenser la tension d'arbre et des courants parasites de palier par contre-réaction capacitive - Google Patents

Dispositif et procédé pour compenser la tension d'arbre et des courants parasites de palier par contre-réaction capacitive Download PDF

Info

Publication number
WO2018196924A1
WO2018196924A1 PCT/DE2018/100404 DE2018100404W WO2018196924A1 WO 2018196924 A1 WO2018196924 A1 WO 2018196924A1 DE 2018100404 W DE2018100404 W DE 2018100404W WO 2018196924 A1 WO2018196924 A1 WO 2018196924A1
Authority
WO
WIPO (PCT)
Prior art keywords
shaft
voltage
compensating
tapping
coupling element
Prior art date
Application number
PCT/DE2018/100404
Other languages
German (de)
English (en)
Inventor
Matthias Goss
Michael Malzer
Original Assignee
Schaeffler Technologies AG & Co. KG
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 Schaeffler Technologies AG & Co. KG filed Critical Schaeffler Technologies AG & Co. KG
Publication of WO2018196924A1 publication Critical patent/WO2018196924A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/26—Devices for sensing voltage, or actuated thereby, e.g. overvoltage protection devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/40—Structural association with grounding devices

Definitions

  • a bearing voltage, d. H. the tension between the two bearing shells is usually correlated with a shaft tension, d. H. the tension between the shaft and mass.
  • Axially interspersed magnetic fields can have a voltage difference (unipolar voltage) between the beginning and end of the bearing shells.
  • a common countermeasure is the grounding of the shaft or a constructive measures to short the bearing halves, such.
  • conductive brushes to reduce the shaft voltage.
  • conductive seals or slip rings can be used, but have the disadvantage that may deteriorate over the life of the contact properties.
  • Conductive bearing grease or oils are based on conductive additives in which the functionality depends on their distribution in the lubricating medium and thus is not always constant.
  • the bearing halves can be sufficiently isolated from each other, so that a current flow is suppressed.
  • a compensation circuit generates a compensation of the unwanted storage current.
  • a reference signal for the compensation is provided via an artificial neutral point, in which the voltages of the three phases of an electric motor, or converter are switched together by means of capacitors.
  • An opposing voltage is generated from these currents via a Umpol transformer, which results in the end in a compensation current, which is fed via a coupling capacitor to the shaft.
  • a disadvantage of this method is that only the voltages of the 3 phases serve as input parameters to provide the compensation current. Only an indirect statement is made about the true conditions at the site of the damage. This means that stray capacitances or bearing currents that are not directly related to the motor or converter operation are not taken into account and therefore no compensation takes place for them.
  • the object of this invention is therefore to effect a more accurate or, ideally, complete reduction of the bearing currents.
  • This object is achieved by a device and a method for compensating a shaft voltage (Uw) on a shaft.
  • a compensation circuit for generating a compensation voltage (UOP) the compensation voltage (UOP) via a coupling element directly or indirectly coupled to the shaft.
  • a detection of the shaft voltage (Uw) takes place directly or indirectly on the shaft.
  • such a controlled system can be provided that takes into account not only parameters of the engine, but the real conditions at the place where the damage occurs. More or even all stray capacitances are taken into account. A more accurate or ideally complete reduction of the bearing currents is thereby effected.
  • a shaft voltage or bearing voltage and possibly resulting destructive bearing current can thereby be reduced.
  • the cause is advantageously irrelevant.
  • the shaft voltage (Uw) usually corresponds to the voltage which the shaft has with respect to the housing or ground.
  • the bearing voltage (UWL) is the tion, which drops between the two bearing shells or rings.
  • the motor winding may be the electrical winding (coil) of a stator or rotor. Also, the winding may be that of a generator instead of a motor.
  • the tap (or detection) and the coupling can take place directly or indirectly.
  • a direct connection a mechanical connection is made directly to the shaft.
  • an indirect connection to another component which is electrically connected to the shaft.
  • a direct conductive connection to the shaft is made in a direct connection, in an indirect coupling or detection takes place by other means, eg. B. by means of a galvanic isolation, z. B. via a capacitor instead.
  • a compensation circuit represents an electronic circuit.
  • components with integrated electrical circuits may be used. These are often inexpensive to manufacture and offer a lot of functionality.
  • the shaft voltage (Uw) is caused by an electric machine connected to the shaft.
  • the compensation of the shaft voltage (Uw) serves to protect at least one rolling bearing or gear.
  • the bearing current or the shaft voltage which is caused by an electrical machine can thus be compensated or neutralized without contact.
  • An electric machine may comprise a stator and a rotor, which are rotatably mounted against each other by means of at least one rolling bearing. Such is endangered by discharges or discharges caused by the bearing current described and lead to wear.
  • the rolling bearing can also be another component that can take damage by the shaft voltage. In addition to rolling bearings this applies z.
  • gears which may be mounted on the shaft and in engagement with another housing-mounted gear similar transition properties (lubricating film with electrical resistance) and thus may have problems such as a rolling bearing.
  • a capacity of the rolling bearing (CWL), a capacity between shaft and housing (CW-G) and a capacity between the motor winding and shaft (Cw-w) are considered here as undesirable stray capacitances.
  • the tapping element comprises a capacitor.
  • Such a widely available and inexpensive passive component can be used.
  • the capacitance or the capacitor represent the pick-off element.
  • a brush is conceivable as a pick-off element, which directly produces a conductive connection.
  • the compensation voltage (UOP) is coupled in by capacitive negative feedback.
  • the coupling element is in particular arranged so that a coupling of the compensation current takes place in a shaft with which the rotor is rotatably mounted in the bearing.
  • the coupling element is preferably designed as a capacitor.
  • the compensation current can be coupled without contact into the shaft and thus into the bearing, so that no wear problems occur in the coupling element when the compensation current is coupled in.
  • An alternative coupling element would be a brush for making a direct electrical connection.
  • the negative feedback comprises the coupling of a voltage which is directed opposite to the shaft.
  • the pick-off element and the coupling element are formed by a respective capacitor, in particular a capacitor.
  • the compensation circuit comprises an amplifier circuit with inverting operational amplifier.
  • a transformer as used in the prior art compensation circuit costs more than the integrated circuit of the operational amplifier.
  • the scope of functions is greater.
  • a non-inverting input of the operational amplifier is connected to a housing or ground,
  • an output of the operational amplifier is connected to a part of the coupling element which is not electrically connected to the shaft.
  • the necessary counter-directed compensation voltage is generated by the inverting operational amplifier by such an interconnection of the measured shaft voltage.
  • an array of coaxial tubes provides capacitance for the pickup and / or coupler.
  • the tapping and / or coupling element can thus be produced by a concrete structural measure, namely the arrangement of two tubes.
  • an array of radially aligned disks provides capacitance for the pickup and / or coupler.
  • the tapping and / or coupling element can thus be produced by a concrete structural measure, namely the arrangement of two radially aligned disks.
  • a not directly or indirectly connected to the shaft part of the tapping and / or coupling element is electrically isolated.
  • a voltage can be measured or coupled in by the insulation. Otherwise, without isolation, the potential of the electrically connected component would always predominate, making measurement or coupling impossible.
  • an insulation with respect to the housing comes into consideration, while an electrical connection to the shaft can exist.
  • the part of the tapping and / or coupling element to be insulated in this case comprises in particular a pipe or a disk which is mechanically connected to the housing or the housing side.
  • the tapping and / or coupling element is connected to the rolling bearing.
  • a module integrated roller bearing
  • a simplified installation, retrofitting and / or maintainability allows.
  • no extra assembly step for mounting the tapping and / or coupling element must be performed, but this happens automatically during assembly of the integrated bearing.
  • the tapping and / or coupling element or parts thereof is integrated as a seal of the rolling bearing or as a seal in the rolling bearing.
  • the tapping and / or coupling element is mechanically separated from the rolling bearing, ie not connected.
  • the tapping and / or copying pelelement is then z. B. mechanically connected directly to the shaft and the housing and not with the rolling bearing.
  • the maintainability can be increased. Replacing only the tapping and / or coupling element or only the (eg worn) roller bearing is thus made possible without having to exchange the respective other component with. Also, the tapping and / or coupling element can be offered as an additional module for retrofitting.
  • shaft is not to be understood as meaning that it is a rotating machine element that transmits only torsional forces.
  • a shaft in the sense of the invention can be just as good an axle, rod, bolt or other component.
  • the decisive factor is that it is an arrangement in which an undesired voltage (interference voltage), referred to here as shaft voltage, occurs.
  • Fig. 1 a is a capacitive equivalent circuit diagram without negative feedback
  • Fig. 1 b is a capacitive equivalent circuit with negative feedback
  • Fig. 2a an axially integrated device for negative feedback
  • Fig. 2b shows an axially separate device for negative feedback
  • Fig. 3a shows a radially integrated device for negative feedback
  • Fig. 3b is a radially separate device for negative feedback
  • FIG. 1a shows a capacitive equivalent circuit diagram for a device without a regulation according to the invention.
  • the following (stray) capacities are available:
  • the capacitive equivalent circuit diagram of Figure 1 a is extended by the inventive circuit for negative feedback as follows:
  • the tapping and coupling element forms a respective capacity via one air gap.
  • These capacitances are formed between the shaft 2 and the respective terminal of the operational amplifier OP.
  • FIGS. 2 a, 2 b, 3 a and 3 b show a shaft 2, which rotates in its own rotation about the axis of symmetry SYM.
  • a rolling bearing 4 - representative of other rotatable components, such.
  • the shaft pierces the roller bearing axially through the inner ring, with which it is mechanically and / or electrically connected.
  • the other side of the rolling bearing 4, in particular its outer ring is connected to a housing 3, which is grounded or has a connection to ground.
  • the tapping and the coupling element are identical in construction and arranged in the gap between the shaft 2 and housing 3. They form a capacity according to the principle of a plate capacitor.
  • the plates or surfaces which act in this case should have a substantially constant distance and area size during the rotational movement of the shaft 2, so that the rotation has no influence on the electrical, in particular the capacitive properties.
  • the two plates are realized in the various figures either by a tube 5 and a counter tube 5b or a disc 6 and a counter-disc 6b.
  • the tube 5, or the disc 6, which faces away from the shaft 2 must be isolated from ground. Otherwise no wave voltage can be detected for the case of the pickup element and no compensation voltage can be coupled in the case of the coupling element.
  • the tube 5, or the disc 6 may indeed be mechanically attached to a ring of the rolling bearing or on the housing, but against this 7 isolated.
  • the electrical wiring is as follows:
  • the non-inverting input of the operational amplifier OP is connected to the housing 3 or ground.
  • the inverting input of the operational amplifier OP is connected to a not connected to the shaft part of the tapping element, for. B. the tube 5 and the disc 6 connected.
  • the output of the operational amplifier OP is connected to a not connected to the shaft part of the coupling element, for. B. the counter tube 5b and the counter pulley 6b connected.
  • the operational amplifier still has two terminals V + and V- for its power supply.
  • the connections can be formed as direct electrical connections or as signal paths, wherein the signal or the voltages and currents for intermediate processing can still be guided via further electrical components not shown here.
  • the tapping and the coupling element are formed by coaxial tubes.
  • Each of the two elements has two such tubes, or tubular pieces with a conductive surface, which take over the functionality of both plates of the plate capacitor, in particular a tube 5 and a counter tube 5b.
  • the plates are not flat, but shaped according to the tube round. Tube 5 and counter tube 5b engage each other, this one of the two consequently has a smaller diameter, so that between the opposite surfaces (plates), push through each other, an air gap, in particular an air gap 1 LS1 at the tapping component and a Air gap 2 LS2 at the coupling component.
  • the two tubes or plates are aligned in the illustration parallel to the shaft.
  • one of the plates can also be formed by the shaft 2 itself, so that the counter tube 5b can be saved, since the shaft, if it is conductive and has a corresponding shape, can take over this function.
  • the air gap is then formed between the tube 5 and the shaft 2.
  • the pickup and the coupling element are formed by disks which extend in the radial direction to the shaft 2.
  • Each of the two elements has two such discs, or annular pieces with a conductive surface, which take over the functionality of both plates of the plate capacitor, in particular a disc 6 and a counter-disc 6b.
  • the surfaces should be flat in this case, since they would otherwise have a variable distance when rotated against each other, which affects the capacity.
  • the disk 6 and the counter disk 6b rotate with each other at an axial distance by the rotation of the shaft. The axial distance creates an air gap, in particular an air gap 1 LS1 on the tapping component and an air gap 2 LS2 on the coupling component.
  • the two Slices, or surfaces are oriented orthogonal in the illustration, or radially to the shaft 2.
  • FIGS. 2 a and 3 a show an integrated roller bearing 4 b, i. H.
  • the rolling bearing forms a structural unit or module with the tapping and coupling element.
  • the parts of the tapping and / or coupling element are mounted directly on the rolling bearing 4, so that an integrated rolling bearing 4b can be provided and delivered as a module.
  • both elements as shown, may each be arranged on the two sides of the rolling bearing 4.
  • an arrangement on only one side is conceivable, while the electrical insulation 7 between tapping and coupling element must be ensured, at least on the part which faces away from the shaft 2, or is not connected to this.
  • An integrated rolling bearing 4b can alternatively also be produced for only the tapping or coupling element.
  • FIGS. 2b and 3b separate (or stand-alone) tapping and coupling elements, which are not mechanically connected directly to the roller bearing 4, are shown in FIGS. 2b and 3b.
  • the tubes 5, or discs 6 no direct mechanical connection with the rolling bearing 4. Instead, they are electrically isolated 7, connected to the housing 3.
  • the optional counter tube 5b or counter disk 6b is electrically conductively connected to the shaft 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)

Abstract

L'invention concerne un dispositif et un procédé pour compenser une tension d'arbre sur un arbre. A cet effet la tension de compensation est couplée directement ou indirectement sur l'arbre par l'intermédiaire d'un élément de couplage, par un circuit de compensation destiné à produire une tension de compensation. Un élément de prélèvement permet d'effectuer une détection de la tension directement ou indirectement sur l'arbre.
PCT/DE2018/100404 2017-04-27 2018-04-26 Dispositif et procédé pour compenser la tension d'arbre et des courants parasites de palier par contre-réaction capacitive WO2018196924A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017109049.5A DE102017109049A1 (de) 2017-04-27 2017-04-27 Vorrichtung und Verfahren zur Kompensation von Wellenspannung und Lagerströmen durch kapazitive Gegenkopplung
DE102017109049.5 2017-04-27

Publications (1)

Publication Number Publication Date
WO2018196924A1 true WO2018196924A1 (fr) 2018-11-01

Family

ID=62148077

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2018/100404 WO2018196924A1 (fr) 2017-04-27 2018-04-26 Dispositif et procédé pour compenser la tension d'arbre et des courants parasites de palier par contre-réaction capacitive

Country Status (2)

Country Link
DE (1) DE102017109049A1 (fr)
WO (1) WO2018196924A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3819920A1 (fr) * 2019-11-05 2021-05-12 Siemens Aktiengesellschaft Dispositif de compensation de tension d'une tension rectangulaire pour un moteur électrique
DE102020124652A1 (de) 2020-09-22 2022-03-24 Schaeffler Technologies AG & Co. KG Radialflussmaschine
DE102021106512A1 (de) 2021-03-17 2022-09-22 Tdk Electronics Ag Messvorrichtung, Elektromotor und Verfahren zur Messung einer Wellenspannung eines Elektromotors
DE102023115918B4 (de) 2023-06-19 2025-02-06 Schaeffler Technologies AG & Co. KG Wellenerdung, elektrische Maschine sowie elektrisch betreibbarer Achsantriebsstrang
DE102023115913A1 (de) 2023-06-19 2024-12-19 Schaeffler Technologies AG & Co. KG Wellenerdung, elektrische Maschine und elektrisch betreibbarer Achsantriebsstrang
DE102023115921B4 (de) 2023-06-19 2025-01-30 Schaeffler Technologies AG & Co. KG Wellenerdung, elektrische Maschine und Kit-of-parts
DE102023115914B4 (de) 2023-06-19 2025-02-06 Schaeffler Technologies AG & Co. KG Wellenerdung, elektrische Maschine und Kit-of-parts
DE102023115917B4 (de) 2023-06-19 2025-02-06 Schaeffler Technologies AG & Co. KG Wellenerdung, elektrische Maschine und elektrisch betreibbarer Achsantriebsstrang
DE102023115919A1 (de) 2023-06-19 2024-12-19 Schaeffler Technologies AG & Co. KG Wellenerdung, elektrische Maschine und Achsantriebsstrang
DE102023115922B4 (de) 2023-06-19 2025-01-30 Schaeffler Technologies AG & Co. KG Wellenerdung, elektrische Maschine und Kit-of-Parts
DE102023119740A1 (de) 2023-07-26 2025-01-30 Schaeffler Technologies AG & Co. KG Rotor, Axialflussmaschine und Antriebsstrang für ein Kraftfahrzeug

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1445850A1 (fr) 2003-02-07 2004-08-11 Ab Skf Dispositif de protection d'un palier contre un courant parasite détériorant
WO2005099071A1 (fr) * 2004-04-05 2005-10-20 Siemens Aktiengesellschaft Dispositif de compensation pour eviter des courants d'appui nuisibles dans une machine electrique et procede de compensation correspondant
DE102005027670A1 (de) * 2005-06-15 2007-01-11 Siemens Ag Anordnung und Verfahren zur Lagerstromüberwachung eines Elektromotors
WO2008116433A1 (fr) * 2007-03-27 2008-10-02 Siemens Aktiengesellschaft Procédé et dispositif de suppression d'un courant de palier dans une machine électrique
WO2010010081A1 (fr) * 2008-07-25 2010-01-28 Siemens Aktiengesellschaft Procédé et système pour contrôler le courant de palier d'une machine électrique
CN101527505B (zh) * 2009-03-31 2012-05-23 西安交通大学 一种干扰电压衰减装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1445850A1 (fr) 2003-02-07 2004-08-11 Ab Skf Dispositif de protection d'un palier contre un courant parasite détériorant
WO2005099071A1 (fr) * 2004-04-05 2005-10-20 Siemens Aktiengesellschaft Dispositif de compensation pour eviter des courants d'appui nuisibles dans une machine electrique et procede de compensation correspondant
DE102005027670A1 (de) * 2005-06-15 2007-01-11 Siemens Ag Anordnung und Verfahren zur Lagerstromüberwachung eines Elektromotors
WO2008116433A1 (fr) * 2007-03-27 2008-10-02 Siemens Aktiengesellschaft Procédé et dispositif de suppression d'un courant de palier dans une machine électrique
WO2010010081A1 (fr) * 2008-07-25 2010-01-28 Siemens Aktiengesellschaft Procédé et système pour contrôler le courant de palier d'une machine électrique
CN101527505B (zh) * 2009-03-31 2012-05-23 西安交通大学 一种干扰电压衰减装置

Also Published As

Publication number Publication date
DE102017109049A1 (de) 2018-10-31

Similar Documents

Publication Publication Date Title
WO2018196924A1 (fr) Dispositif et procédé pour compenser la tension d'arbre et des courants parasites de palier par contre-réaction capacitive
CH674433A5 (fr)
EP2304866B1 (fr) Procédé et système pour contrôler le courant de palier d'une machine électrique
DE102006007437B4 (de) Elektrische Maschine mit einer Vorrichtung zur Vermeidung von schädlichen Lagerströmen und entsprechendes Verfahren
DE102020119719A1 (de) Ableitvorrichtung für eine elektrische Maschine sowie elektrische Maschine mit der Ableitvorrichtung
WO2018196925A1 (fr) Dérivation capacitive permettant de réduire les tensions électriques d'arbre ou les tensions électriques de palier
DE102016201772A1 (de) Rohrförmige Antriebseinrichtung
DE102015211644A1 (de) Verbesserte elektromagnetische Verträglichkeit einer Antriebsordnung für ein elektrisch angetriebenes Fahrzeug
DE102021213388A1 (de) Anordnung zur Erdung einer Welle
WO2015185261A1 (fr) Moteur électrique comprenant un condensateur à plaque tournante servant à dévier des courants parasites hf
DE112016002577T5 (de) Lagerisolator
WO2023175030A1 (fr) Robot à codeur absolu
DE102015221202A1 (de) Federträger für ein Fahrwerk eines Kraftfahrzeuges
DE102021214385A1 (de) Lageranordnung für einen Elektromotor, und Elektromotor
DE102021120925A1 (de) Antriebssystem für ein hybrides oder elektrisches Fahrzeug
DE102020125531A1 (de) Wellenerdungsring, Lagereinheit mit Funkenspitzen, Lagereinheit sowie elektrische Antriebsanordnung mit der Lagereinheit und/oder Wellenerdungsring
DE102015100847A1 (de) Elektromaschine mit reduzierter elektromagnetischer Störverteilung
DE102022212386A1 (de) Elektrische Maschine
DE102014225216A1 (de) Elektrische Maschine mit einer Potentialausgleichsvorrichtung
WO2015091292A2 (fr) Module à bagues collectrices, machine électrique
DE102014212319A1 (de) Nockenwellenversteller und Verfahren zur Bestimmung der Einstellung eines Nockenwellenverstellers
DE102018206107A1 (de) Erdung eines Generators
WO2015035988A1 (fr) Palier à roulement à unité de production d'énergie
DE102023115918B4 (de) Wellenerdung, elektrische Maschine sowie elektrisch betreibbarer Achsantriebsstrang
DE102023115913A1 (de) Wellenerdung, elektrische Maschine und elektrisch betreibbarer Achsantriebsstrang

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18723691

Country of ref document: EP

Kind code of ref document: A1

122 Ep: pct application non-entry in european phase

Ref document number: 18723691

Country of ref document: EP

Kind code of ref document: A1

点击 这是indexloc提供的php浏览器服务，不要输入任何密码和下载