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WO2025067584A1 - Dispositif de connexion électrique et machine à entraînement électrique - Google Patents

Dispositif de connexion électrique et machine à entraînement électrique Download PDF

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Publication number
WO2025067584A1
WO2025067584A1 PCT/DE2024/100740 DE2024100740W WO2025067584A1 WO 2025067584 A1 WO2025067584 A1 WO 2025067584A1 DE 2024100740 W DE2024100740 W DE 2024100740W WO 2025067584 A1 WO2025067584 A1 WO 2025067584A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrical connection
connection device
clamping
line elements
busbar
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.)
Pending
Application number
PCT/DE2024/100740
Other languages
German (de)
English (en)
Inventor
Manuel Herrmann
Felix Gerstner
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.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and 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 and Co KG filed Critical Schaeffler Technologies AG and Co KG
Publication of WO2025067584A1 publication Critical patent/WO2025067584A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/52—Fastening salient pole windings or connections thereto
    • H02K3/521—Fastening salient pole windings or connections thereto applicable to stators only
    • H02K3/522—Fastening salient pole windings or connections thereto applicable to stators only for generally annular cores with salient poles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/02—Soldered or welded connections
    • H01R4/027—Soldered or welded connections comprising means for positioning or holding the parts to be soldered or welded
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/02—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for soldered or welded connections
    • H01R43/0263—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for soldered or welded connections for positioning or holding parts during soldering or welding process
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2203/00—Specific aspects not provided for in the other groups of this subclass relating to the windings
    • H02K2203/09—Machines characterised by wiring elements other than wires, e.g. bus rings, for connecting the winding terminations

Definitions

  • the invention relates to an electrical connection device and an electrical drive machine comprising at least one electrical connection device.
  • electrical drive machines such as electrical rotating machines
  • high vibration loads can occur on the connected contacts.
  • a stator rotates relative to a rotor. Vibrations occurring during this process can be transmitted to the stator.
  • the stator typically comprises windings assigned to individual phases of the stator's electrical connections. Connected to the windings are line elements that connect the windings to phase circuits.
  • the phase circuits are often implemented on or by busbars.
  • busbars can be arranged on a fixed structure, so that relative vibrational movements can occur between the stator and the busbars. Accordingly, the line elements are exposed to vibration loads. Over their service life, these vibration loads can lead to failures in the high-voltage contact between the stator of the electrical rotating machine and power electronics in the so-called high-voltage terminal.
  • US 2019 356 193 A1 discloses a decoupling element for connecting power electronics to an electrical machine, comprising at least one holder made of insulating material and at least one busbar arranged on the holder.
  • the decoupling element has a first region, a second region arranged substantially parallel to the first region and spaced therefrom, and a curved third region serving as a spring element, which connects the first region to the second region.
  • the at least one busbar is connected at its second region to the holder via at least one holding element.
  • the decoupling element It essentially operates according to the principle of a curved spiral spring, which is only loaded in the elastic, third curved area, resulting in, among other things, a long service life. Furthermore, the spring action ensures a large tolerance compensation between the individual components while simultaneously providing high stability. Furthermore, vibrations can be decoupled, which improves vibration resistance.
  • DE 10 2020212 117 A1 teaches an electric machine system for a motor vehicle, comprising an electric machine for driving the motor vehicle and power electronics for operating the electric machine, wherein the electric machine has winding wires that are led out of the electric machine for electrically coupling the electric machine to the power electronics.
  • a coupling sleeve for electrically coupling to a busbar of the power electronics is arranged at a wire end region of a winding wire, wherein the coupling sleeve has a coupling region facing away from the winding wire for mechanically and electrically coupling to the busbar.
  • the coupling region has two coupling legs, wherein a receiving region is formed between the coupling legs, and wherein a busbar section of the busbar is arranged and held in the receiving region.
  • the present invention is based on the object of providing an electrical connection device and an electric drive motor equipped therewith, which ensure a long service life in a simple and cost-effective manner despite the occurrence of vibrations.
  • This object is achieved by the electrical connection device according to claim 1 and by the electric drive motor according to claim 10.
  • Advantageous embodiments of the electrical connection device are specified in subclaims 2 to 9.
  • the invention relates to an electrical connection device for electrically connecting at least one winding of a phase of an electrical A drive machine comprising at least one busbar and at least two conductor elements connected to the busbar, which are configured for electrical connection to a winding of a phase of an electric rotary machine.
  • the conductor elements are fixed to one another by means of a clamping means.
  • the electrical connection device can also be referred to as a terminal.
  • the electrical connection device can, for example, be a high-voltage terminal and be configured accordingly to implement the electrical connection in a high-voltage area.
  • the power rail can also be called a busbar.
  • the conducting elements oscillate relative to the busbar.
  • the conducting elements can be designed as wires, for example.
  • the clamping means fixes the line elements to one another by clamping a respective line element at a respective clamping point and a rigid mechanical connection between the clamping points.
  • line elements arranged in pairs which are assigned to respective phases of an electric drive device, can be clamped with a clamping means described.
  • a special embodiment provides for line elements assigned to different phases to be clamped in pairs using the clamping device. This only requires sufficient electrical insulation from the clamping device.
  • the natural frequency of the line elements fixed to each other can be significantly influenced.
  • the line elements vibrate with a significantly lower amplitude than in a situation without the use of the clamping device, and/or have a natural frequency that is far removed from the vibrations induced during operation of a connected electric rotating machine.
  • This ensures that the line elements, as well as elements electrically coupled to the line elements, such as the windings and/or busbars, are subjected to significantly lower mechanical stresses and continue to have a long service life.
  • the eigenmode of the natural frequency can be modified in such a way that the point of occurrence of the maximum mechanical stress is shifted. This can prevent crack initiation at points with excessive stress due to notch effects.
  • the line elements can be indirectly connected to one another by means of the busbar in respective connection areas and can be mechanically fixed in relation to one another in such a way that the clamping means fixes the line elements at a distance D between the clamping points and the connection areas.
  • the ratio of a distance D between the clamping point and the connection area to a length L of the conductor elements from the connection area to the electrical connection of the conductor element to a winding can be D/L ⁇ 0.2.
  • the length L of the conductor elements from the connection area to the electrical connection of the conductor element to a winding can also be referred to as the free vibration length if the conductor element is considered without clamping.
  • the length of the conductor elements is determined by the average of the lengths of the two conductor elements connected per phase, and not by the sum of the lengths of the two conductor elements.
  • the conductor elements can extend at least partially in one plane, and sections of the conductor elements running in this plane can be fixed in this plane by means of the clamping means through its clamping action.
  • Conductor sections running in a plane can directly adjoin the connecting regions, although the invention is not limited thereto.
  • An alternative embodiment provides that the conductor elements extend at least partially in one plane, and sections of the conductor elements running in this plane are fixed outside this plane by means of the clamping means through its clamping action.
  • the clamping means can at least partially rest against the conductor rail. This prevents the conductor elements from moving in a translational degree of freedom perpendicular to the plane, as the clamping means can be supported on the conductor rail and thus the conductor elements can also be clamped perpendicular to the plane.
  • Busbar or to the arrangement level in which the line elements and the busbar are arranged.
  • the present invention is not limited to this embodiment, but can also be designed in such a way that there is a distance between the clamping means and the busbar, so that the line elements mechanically fixed to one another by means of the clamping means are given more freedom of movement along the aforementioned translational degree of freedom.
  • the electrical connection device can be configured such that the clamping means clamps a respective line element at only one clamping point.
  • a clamping point comprises at least two opposing regions of the respective line element, which are subjected to compressive forces generated by the clamping means.
  • clamping means clamps a respective line element at several clamping points.
  • At least one of the conductor elements can be welded to the busbar in a respective connection area.
  • the material of the clamping device can be plastic.
  • An advantageous embodiment of the clamping device provides that the plastic is temperature-resistant.
  • the described electrical connection device enables the reduction of vibrations of the line elements in the event of vibration excitation, such as in the case of an electric drive motor to whose windings the electrical line elements are connected.
  • a further aspect of the present invention is an electric drive machine which has at least one described electrical connection device.
  • Figure 1 an electrical connection device in a first perspective view
  • Figure 2 the electrical connection device in view from below
  • Figure 3 Detail A from Figure 2 in an enlarged view.
  • Figure 1 shows an electrical connection device 1 according to the present invention in a perspective view.
  • the electrical connection device 1 comprises three connections for electrical contact with phases, namely with a first phase 11, a second phase 12 and a third phase 13.
  • the respective phases are connected to corresponding busbars, namely to a first busbar 21, a second busbar 22 and a third busbar 23.
  • a respective busbar 21, 220, 23 forms a so-called respective busbar.
  • the electrical connection device 1 further comprises a housing 14, such as made of plastic, for receiving the connections of the phases 11, 12, 13 and the busbars 21, 22, 23.
  • Each of the busbars 21, 22, 23 is contacted by two conducting elements, namely a first conducting element 31 and a second conducting element 32.
  • These conducting elements 31, 32 are designed to be electrically conductively connected to windings of the relevant phase of a stator (not shown here) of an electrical rotary machine.
  • FIG. 2 shows the electrical connection device 1 from below, wherein a respective clamping means 50 can be seen assigned to each busbar 21, 22, 23, which is arranged in the area of the mechanical connection of the two line elements 31,32 to a respective busbar 21,2 20,23.
  • Both line elements 31, 32 are connected to the first busbar 21 in respective connection areas 40 by means of parallel welds 41, namely in the area of a respective wire 33 exposed from insulation material 34.
  • a clamping means 50 is provided in the form of a plastic part, which is connected to each of the two line elements 31, 32 by means of two clamping points, namely a first clamping point 51 and a second clamping point 52.
  • the respective first clamping point 51 in the embodiment shown here merely helps to fix the clamping means 50 to the two line elements 31, 32. Accordingly, the first clamping point 51 merely serves to stabilize the clamping means 50 itself in order to ensure a more stable mechanical fixation of the two line elements 31, 32 outside the connection area 40.
  • the respective second clamping point 52 is spaced apart from the respective connecting region 40 along the longitudinal direction of the two line elements 32 by a distance D.
  • the two line elements 31, 32 are clamped at respective second clamping points 52 on each of the two line elements.
  • the clamping means in the embodiment shown here has a central part 54 which acts on both line elements 31, 32.
  • a respective line element 31, 32 is thus clamped on both sides in the plane shown, so that, as shown by way of example with the first line element 31 at the second clamping point 52, compressive forces 60 act on both sides of the first line element 31. These compressive forces 60 are therefore also applied at the distance D between the second clamping point 52 and the connecting region 40.
  • the line elements 31, 32 would oscillate around the support point 42. This would allow the line elements 31, 32 to exhibit a significantly higher amplitude during the oscillation.
  • the support point of the oscillating movement 53 is now located at the point where the compressive forces 60 are introduced, or at the second clamping point 52.
  • the distance D of the second clamping point 52 to the connecting area 40 is significantly less than the length L of the line elements, which is indicated graphically in Figure 2. Nevertheless, the distance D of the second clamping point 52 to the connecting area 40 is sufficiently large to prevent the amplitude of a pivoting movement of the line elements from being very large.
  • this influences the natural frequency of the oscillating system, which comprises the busbar, the line elements 31, 32, and the clamping means 50, so that the natural frequency range of this oscillating system can be shifted in such a way that resonant behavior of this oscillating system is excluded during normal operation of an electrical rotating machine having the electrical connection device.
  • clamping means 50 can be displaced along the longitudinal direction of the line elements 31, 32 in order to be able to set different amplitudes and their own natural frequency ranges.
  • a further effect of the clamping means 50 used is that the maximum mechanical bending stress will now occur at the second clamping points 52, and no longer at the connection area 40, where there is a higher risk of breakage for the line elements 31, 32 due to the higher notch effect.
  • the electrical connection device proposed here, as well as the electric drive motor equipped therewith, provide devices that ensure a long service life in a simple and cost-effective manner despite the occurrence of vibrations. List of reference symbols

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)

Abstract

L'invention concerne un dispositif de connexion électrique et une machine à entraînement électrique comprenant au moins un dispositif de connexion électrique. Le dispositif de connexion électrique (1) est utilisé pour connecter électriquement au moins un enroulement d'une phase d'une machine à entraînement électrique et comprend au moins une barre omnibus (21, 22, 23) et, reliés à la barre omnibus (21, 22, 23), au moins deux éléments de ligne (31, 32) conçus pour une connexion électrique à un enroulement d'une phase d'une machine électrique tournante, les éléments de ligne (31, 32) étant fixés l'un à l'autre au moyen d'un élément de serrage (50). L'utilisation du dispositif de connexion électrique décrit ici et de la machine à entraînement électrique équipée de ce dispositif permet d'obtenir des dispositifs qui garantissent, de manière simple et économique, une longue durée de vie en dépit des oscillations qui se produisent.
PCT/DE2024/100740 2023-09-26 2024-08-19 Dispositif de connexion électrique et machine à entraînement électrique Pending WO2025067584A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102023126055 2023-09-26
DE102023126055.3 2023-09-26

Publications (1)

Publication Number Publication Date
WO2025067584A1 true WO2025067584A1 (fr) 2025-04-03

Family

ID=92633121

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2024/100740 Pending WO2025067584A1 (fr) 2023-09-26 2024-08-19 Dispositif de connexion électrique et machine à entraînement électrique

Country Status (1)

Country Link
WO (1) WO2025067584A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030134522A1 (en) * 2002-01-15 2003-07-17 Hitachi, Ltd. Connecting structure and its connecting method, and rotating machinery and alternating current generator using this structure and method
US20150017845A1 (en) * 2013-07-09 2015-01-15 Hitachi Metals, Ltd. Wire connection member, wire connection structure and annular power distribution member
DE102015226700A1 (de) * 2015-12-23 2017-06-29 Robert Bosch Gmbh Elektrische Verbindungsanordnung zur Verbindung von elektrischen Leitern
US20190356193A1 (en) 2016-12-16 2019-11-21 Zf Friedrichshafen Ag Decoupling element for connecting power electronics to an electric machine
WO2022033630A1 (fr) * 2020-08-13 2022-02-17 Schaeffler Technologies AG & Co. KG Machine électrique comprenant un mécanisme de protection sur un joint soudé, et procédé d'assemblage de la machine électrique
DE102020212117A1 (de) 2020-09-25 2022-03-31 Volkswagen Aktiengesellschaft Elektromaschinensystem, Verfahren und Kraftfahrzeug

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030134522A1 (en) * 2002-01-15 2003-07-17 Hitachi, Ltd. Connecting structure and its connecting method, and rotating machinery and alternating current generator using this structure and method
US20150017845A1 (en) * 2013-07-09 2015-01-15 Hitachi Metals, Ltd. Wire connection member, wire connection structure and annular power distribution member
DE102015226700A1 (de) * 2015-12-23 2017-06-29 Robert Bosch Gmbh Elektrische Verbindungsanordnung zur Verbindung von elektrischen Leitern
US20190356193A1 (en) 2016-12-16 2019-11-21 Zf Friedrichshafen Ag Decoupling element for connecting power electronics to an electric machine
WO2022033630A1 (fr) * 2020-08-13 2022-02-17 Schaeffler Technologies AG & Co. KG Machine électrique comprenant un mécanisme de protection sur un joint soudé, et procédé d'assemblage de la machine électrique
DE102020212117A1 (de) 2020-09-25 2022-03-31 Volkswagen Aktiengesellschaft Elektromaschinensystem, Verfahren und Kraftfahrzeug

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