WO2021043605A1 - Procédé de fabrication d'une bobine électrique métallique hélicoïdale - Google Patents

Procédé de fabrication d'une bobine électrique métallique hélicoïdale Download PDF

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Publication number
WO2021043605A1
WO2021043605A1 PCT/EP2020/073572 EP2020073572W WO2021043605A1 WO 2021043605 A1 WO2021043605 A1 WO 2021043605A1 EP 2020073572 W EP2020073572 W EP 2020073572W WO 2021043605 A1 WO2021043605 A1 WO 2021043605A1
Authority
WO
WIPO (PCT)
Prior art keywords
coil
voltage
current
electrical
seconds
Prior art date
Application number
PCT/EP2020/073572
Other languages
German (de)
English (en)
Inventor
Matthias Busse
Franz-Josef Wöstmann
Original Assignee
Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
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 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. filed Critical Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
Priority to EP20761223.5A priority Critical patent/EP4026151A1/fr
Publication of WO2021043605A1 publication Critical patent/WO2021043605A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/06—Coil winding
    • H01F41/071—Winding coils of special form
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/06—Coil winding
    • H01F41/064—Winding non-flat conductive wires, e.g. rods, cables or cords
    • H01F41/066—Winding non-flat conductive wires, e.g. rods, cables or cords with insulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/06—Coil winding
    • H01F41/079—Measuring electrical characteristics while winding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/12—Insulating of windings
    • H01F41/122—Insulating between turns or between winding layers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/04—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of windings, prior to mounting into machines
    • H02K15/0435—Wound windings
    • H02K15/0442—Loop windings
    • H02K15/045—Form wound coils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y80/00—Products made by additive manufacturing

Definitions

  • the invention is in the field of mechanical engineering and manufacturing technology and is concerned with manufacturing processes for electrical coils.
  • wound electrical coils are used to generate magnetic fields or to convert magnetic fields into electrical currents. Great importance is attached to high efficiency, especially when there is little space required.
  • coils are used that are built up by winding strand-like electrical conductors, usually as insulated wires or strands.
  • the manufacturing or processing methods mentioned have an unfavorable effect on the thermal and / or electrical conductivity.
  • the conductivity can be negatively influenced.
  • the present invention is based on the object of creating a manufacturing method for helical metallic electrical coils with which the best possible electrical and / or thermal conductivity of the resulting coil is sufficient.
  • the object is achieved with the features of the invention according to claim 1.
  • the subclaims each relate to implementations of the method according to the invention.
  • the invention also relates to a device for treating a coil.
  • the invention relates to a method for producing a helical metallic electrical coil, in which the coil body is first produced in its final geometric shape.
  • the object is achieved according to the invention in that an electrical current and voltage supply is connected to the coil body and that a current and voltage curve in the coil body is controlled in such a way that a structure is achieved by changing the structure of the material of the coil, which has a lower specific electrical resistance compared to the initial state.
  • the voltage that is applied to the coil body by means of the current and voltage supply can, for example, be a constant or variable direct voltage over time, an alternating voltage with constant or variable amplitude or also a be modulated DC voltage.
  • the change in structure of the material of the coil can be achieved either directly by the flow of current or indirectly by reaching a certain temperature in the material of the coil body. This effect can be used, for example, to homogenize the material by eliminating grain boundaries or microcracks that have been produced by the manufacturing process for the coil former.
  • the method can be used with particular advantage in the case of coils made of aluminum or an aluminum alloy, however, also made of copper or a copper alloy.
  • a suitable phase shift can be generated between current and voltage in order to establish the desired mathematical relationship between current and voltage, so that current and voltage are also certain limits can be controlled.
  • the internal resistance of the current and voltage supply can be changed, so that current and voltage can also be set independently of one another through this effect. It is also possible to equip the current and voltage supply with a converter in order to be able to control current and voltage independently of one another by means of a pulse-width modulated signal.
  • One embodiment of the method can provide that for at least 5 seconds, in particular for at least 10 seconds, further in particular at least 100 seconds, or for at least 1,000 seconds, a current strength of at least 20 amps, in particular at least 50 amps, further in particular at least 50 Amps, or at least 100 amps, and / or a power of at least 5 watts, in particular at least 10 watts or at least 20 watts per cm of trace wire is achieved.
  • the stated current strength and voltage can alternatively or additionally be applied, for example, for a maximum of 10,000 seconds, in particular for a maximum of 5,000 seconds.
  • the specified duration with the specified current strength is sufficient to change the structure of a coil body in a sustainable and advantageous manner.
  • Another embodiment of the method can provide that the temperature of the material of the coil is increased to at least 500 degrees Celsius, in particular to 700 degrees Celsius for at least 20 seconds, in particular for at least 60 seconds.
  • Such a regulation of current and voltage to a target value of the reached temperature can also ensure a desired change in structure.
  • the current and voltage in the coil are controlled while the electrical resistance is being measured in such a way that a change in the electrical resistance of the coil up to a predetermined target value is achieved. This regulates the current and voltage to the desired target value for the resistance.
  • Current and voltage can also be regulated in such a way that a transformation temperature of the structure is just reached and is held for at least 50 seconds, in particular at least 1 minute, further in particular 3 minutes.
  • Current and voltage can also be regulated so that a temperature of the coil is reached asymptotically which is below the melting temperature, in particular at least 20 ° C or 50 ° C below the melting temperature, but which is at a distance from the melting temperature, at most 200 ° C is in particular 100 ° C.
  • This temperature can be maintained for at least 10 seconds, in particular at least 1 minute, further in particular at least 5 minutes, and then lowered.
  • the current and voltage in the coil are controlled in such a way that several cycles with increasing and decreasing current strength are run through one after the other.
  • the coil is positioned in a support device.
  • Current and voltage can then be applied to the coil positioned in the supporting device.
  • the support device can be set up to support the coil in its shape and thus prevent unwanted deformation of the coil when it heats up, for example, to prevent.
  • the support device can have, for example, comb-like structures that hold the turns of the coil.
  • the support device is preferably designed to be insulating and, for example, made of ceramic or of a metal coated with an insulating layer.
  • the coil is heated via the support device.
  • the support device can have a corresponding heater.
  • the support device can be heated to 200 ° C. to 300 ° C. or to 400 ° C. to 500 ° C., for example for copper.
  • the temperature of the support device is selected to be lower in possible versions of the method than a maximum temperature to which the coil is heated during the method, for example by applying current and voltage.
  • cover layer in particular an insulating layer, in order to prevent electrical contact between adjacent turns of the coil and / or electrical flashovers between adjacent turns or electrical flashovers between the coil body and the surrounding area to prevent electrically conductive parts.
  • the cover layer can be applied before or after the application of an electrical voltage to change the structure.
  • the cover layer can be dried by heating the coil by applying a current or a voltage.
  • the top layer can also be hardened by a polymerization process.
  • a cover layer can be applied in one step of the method after the structural change has been brought about by applying current and voltage.
  • a voltage and a current are applied to the coil while the cover layer is being applied, preferably by the same current and voltage supply that also provides current and voltage for the structural change.
  • a coating can be carried out using a powder coating process or by electrocoating. In both methods, the coating process can be controlled by a possible applied voltage. Alternatively or additionally, the coating process can be controlled by temperature control, which is preferably also accomplished by means of the current and voltage supply.
  • a temperature to which the coil is heated for coating can be selected to be lower than a temperature which is used for the change in structure.
  • the temperature during the coating can be at most half a temperature when changing the structure.
  • the temperature during coating can be around 180 ° C or 200 ° C, for example.
  • the coil is covered with a cover layer before an electrical voltage is applied to change the structure, which is dried when the coil is heated by applying an electrical voltage or by a polymerization process is hardened.
  • the material of the cover layer can be selected so that when the coil is heated it is hardened either by drying, ie evaporation of a solvent, or by a polymerization process. In this way, the manufacturing process of the coil can be accelerated, and the formation of a reliable insulation layer on the surface of the helix can be ensured.
  • the coil remains in the same holding device during the various steps for coating and for changing the structure, preferably with a continuously connected power and voltage supply.
  • the voltage on the coil is increased in such a way that voltage surges or signs of voltage surges occur between adjacent coil windings and that the voltage surges and the voltage are registered and the electrical strength is determined from them.
  • the flashover strength of the electrical coil can thus be increased by means of the current and voltage sources that are already available be tested immediately during or after the production or the structural change or immediately during or after the hardening of a top layer. Partial discharges, for example, can be registered as a sign of voltage flashovers. Thus, for example, if the desired flashover strength has not been achieved, a new or further coating can be applied to the coil body and cured.
  • the method can also provide for a quality check to be carried out.
  • a quality check can include, for example, a heat detection, in particular a spatially resolved measurement of the temperature of the coil.
  • casting defects such as voids, pores, cracks or oxide inclusions can cause local resistance increases and thus temperature increases when a current or voltage is applied, which can be determined by the heat detection.
  • the heat detection can be done by a heat detector, for example optically - for example by an infrared camera - or also by tactile means.
  • the temperature of the coil can be monitored by means of a corresponding test device, which includes the heat detector, for example. This can be done while the structural change is being made, but it is also possible to heat the coil specifically to check the quality, for example using the current and voltage supply, which also serves or can serve to change the microstructure.
  • the coil body which is treated according to one of the above-mentioned method variants, can basically be produced by casting or by reshaping, for example extrusion, bending and subsequent deformation of the individual turns, or by an additive manufacturing process.
  • the processes mentioned are those in which a structural change or the production of an unfavorable structure can be considered.
  • a coil body with a grain-like structure that resembles a sintered body with pores can arise.
  • Such a body does not have optimal properties for the conduction of electrical current or heat, and its structure can be significantly improved by at least partial melting become.
  • the invention relates not only to a method of the type explained above, but also to a device for treating a coil with an electrical power and voltage supply, two supply connections for connecting the power and voltage supply to a respective section of the coil and to a control device for controlling the current and voltage.
  • the device can, for example, be constructed as a DC voltage supply, in particular with the option of modulating the DC voltage.
  • the device can also be constructed as an alternating voltage device, with the possibility of generating reactive power in order to provide the current and voltage with a desired phase shift, if necessary.
  • the internal resistance of the current and voltage supply can also be suitably adjustable in order to be able to control the current strength and voltage on the coil body independently of one another within certain limits.
  • the device can comprise a support device for avoiding deformation of the coil during the structural change.
  • the support device can be heatable and / or comprise a heater.
  • the device can comprise a coating device for applying a cover layer.
  • the coating device can be designed, for example, as a powder coating device or as an electrocoating device.
  • the device can comprise a test device.
  • the test device can comprise a heat detector, which is preferably set up to detect temperatures in a spatially resolved manner.
  • the heat detector can be designed optically or tactilely, for example.
  • the heat detector can be an infrared camera.
  • the device comprises at least two of the supporting device, the coating device and the testing device, preferably all three. Furthermore, it can comprise a holder that can hold the coil when it is connected to the power and voltage supply.
  • the support device and / or coating device and / or test device can be passed through by the coil without the coil having to be removed from the holder or disconnected from the voltage and power supply.
  • the holder comprises, for example, a movable arm or the support device (if present) and the coating device (if present) and the test device (if present) can be moved relative to the holder.
  • the coil positioned in the holder and connected to the power and voltage supply can be moved in steps of the method into the support device (if provided) and in the coating device (if provided) and in the test device (if provided), but at least in two these devices mentioned, are moved and treated accordingly.
  • the test device can be set up in such a way that the coil can be monitored during the structural change and / or during the coating.
  • the devices can be run through in an automated process from the spool with the aid of the holder.
  • FIG. 1 shows a perspective view of a coil with a device for voltage and power supply, shown schematically,
  • Fig. S shows a possible voltage curve in the treatment of the
  • Fig. 4 shows another possible voltage curve in the treatment of the coil
  • Fig. 6 shows another possible voltage curve in the treatment of the coil
  • Figure 1 shows a perspective view of a helical metallic electrical coil 1, which consists of a wire with a rectangular cross-section.
  • the material of the coil 1 can be aluminum or an aluminum alloy, Be copper or a copper alloy or another electrically conductive metal or metal alloy.
  • the upper end la of the coil 1 in the figure is connected to a current and voltage supply 2 by means of a supply line S and a connector.
  • the lower end 1b of the coil 1 in the figure is connected to the current and voltage supply 2 by means of a supply line 4 and a connection.
  • a current and a voltage can be applied to the coil 1 by means of the current and voltage supply 2, with the current and / or voltage being controllable as a function of time.
  • the control can include a control of the voltage, a control of the current or the amperage or a control of both variables, also independently of one another.
  • the internal structure of the power and voltage supply 2 can be designed in various ways.
  • the current and voltage supply 2 can have a transformer and a rectifier and a semiconductor controller for setting a current or a voltage.
  • the current and voltage supply 2 can also have an electrical converter which allows the coil to be controlled by means of a high-frequency voltage pulse, the control being possible by means of pulse width modulation or other known modulations. This allows current and voltage to be controlled or regulated independently of one another.
  • the target voltage at the coil 1, which can be monitored, or the current 1 flowing through the coil, for example, can serve as the controlled variable.
  • a temperature sensor 5 can be provided on the coil, which sends a signal representing the measured temperature to the current and voltage supply 2.
  • FIG. 2 shows in a longitudinal section a metallic electrical coil with three turns 6, 7, 8, each of the turns having a metallic core 6a and an insulating sheath 6b.
  • the core 6a can be rectangular, oval, circular or also polygonal in cross section or have a different cross-sectional shape.
  • the core is made of a metal, for example Aluminum or an aluminum alloy, copper or a copper alloy or another metal or an alloy of several different metals.
  • the sheath 6b is electrically insulating and can be designed, for example, as an oxide layer, in particular as an oxide layer of the sheathed material.
  • the casing 6b can, however, also be designed as a plastic layer, for example as a resin layer or lacquer layer, which can be applied by painting or dipping the coil or by spraying.
  • Advantages through the treatment of the coil according to the invention can result in particular in the event that the coating material can be polymerized by heating or that the polymerization can be accelerated by heating.
  • the electrical coil 1 can be produced by casting, additive manufacturing processes (BD printing) or reshaping, such as, for example, winding a wire blank. Combined manufacturing processes are also possible, such as casting or 3D printing with a subsequent axial compression of the coil body, as indicated by the arrows 9, 10. This allows the empty space between the individual turns to be minimized after production.
  • BD printing additive manufacturing processes
  • reshaping such as, for example, winding a wire blank.
  • Combined manufacturing processes are also possible, such as casting or 3D printing with a subsequent axial compression of the coil body, as indicated by the arrows 9, 10. This allows the empty space between the individual turns to be minimized after production.
  • An insulation layer 6b can take place before or after a first heat treatment of the electrical coil, and the coating can be cured by the heat treatment of the electrical coil or by a subsequent further heat treatment.
  • the heat treatment of the coating 6b can be carried out just like the treatment of the metallic coil material to increase the electrical and / or thermal conductivity by applying a current or a voltage to the coil.
  • FIG. 3 shows several possible voltage profiles of the voltage applied to coil 1 as a function of time t.
  • a first voltage curve 11 represents the application of a voltage Ui and a correspondingly steep voltage increase on the coil up to the value Ui, whereupon the voltage is rapidly reduced again after the time ti up to the time t2.
  • Typical times for ti and / or t2 are in the range between half a second and several seconds.
  • An alternative voltage curve 12 shows, after the point in time ti, a modulated sinusoidal direct voltage around the value Ui, which lasts until the end of the treatment, which is not specified in more detail.
  • the further alternative voltage curve 13 provides that the voltage is increased to the value Ui and then kept constant until the end of the treatment.
  • FIG. 4 shows the use of an alternating voltage 14 for the treatment of the coil, which leads to the fact that the direction of the current through the coil is periodically reversed.
  • the electrical power converted in the coil leads to heating of the coil and the desired change in structure.
  • the amplitude of the alternating voltage 14 can also be varied as a function of the time t.
  • FIG. 5 shows a possible, controllable course of the current / the current strength I through the coil, the current strength being increased within a short time to the current strength li and then being kept constant for a period of time.
  • the current can then be reduced to zero by time t3 or kept constant at an intermediate value I2 for the duration of a subsequent time interval before the current intensity is reduced to zero.
  • FIG. 6 initially shows a voltage curve in which the voltage is increased up to the voltage value Ui and is kept constant for a time up to the time t4. During this time, a current is impressed on the coil, which leads to heating and the desired change in structure. The voltage can then be increased abruptly to check the dielectric strength of the coil. A voltage peak at which signs of voltage breakdown are just being observed can be used for Time ts be reached. The voltage is then not increased any further, but decreased to zero.
  • a time interval can also be provided in which an applied voltage below the voltage Ui sets a temperature on the coil that is lower than the voltage necessary for the structural change and that over a longer time interval for curing a coating of the coil leads. It can also be useful to carry out the breakdown voltage test after the coating has hardened, since the dielectric strength of the coating can also change as a result of the hardening.
  • FIG. 7 on a different time scale than that selected for FIGS. 3 to 6, a pulse-width-modulated voltage signal supplied by way of the current and voltage supply 2 is shown.
  • a certain voltage U2 is supplied by a converter and switched on and off with a selected pulse width and frequency.
  • a current intensity can be set that takes a second value, for example between 0 and t 6 a first value, and between t 6 and t 7.
  • the current intensity set between t 6 and t7 is less than the current intensity set between 0 and t 6 .
  • a converter can be used to set the current independently of the voltage on the coil.
  • the converter can be supplemented with resistors and capacitors for convenient control in order to be able to freely and independently control the current and voltage that are applied to the coil 1 in the largest possible areas.
  • the invention enables the treatment of an electrical metallic coil 1, which can lead to a desired structural change in the material of the coil and possibly also to a hardening of a coating, whereby the conductivity (both the electrical and possibly the thermal) of the coil material is increased .
  • This makes it possible to increase the efficiency of electrical machines that are provided with such a coil, the size and shape of the coil remaining unchanged.
  • FIG. 8 schematically shows steps of a possible method for producing a coil.
  • step S1 a helical metallic electrical coil is provided, positioned in a movable holding device, and the Spulenkör is connected to an electrical power and voltage supply.
  • step S2 the coil is moved into a supporting device with the aid of the movable holding device and then a structural change is brought about with the aid of the electrical current and voltage supply in the manner described in connection with the preceding figures.
  • the support device engages in a comb-like manner between the turns of the coil and prevents unwanted deformation of the coil during the structural change.
  • the support device comprises ceramic and / or metal coated with an insulating material and is kept at a temperature of, for example, 180 ° C by means of a heater while the structural change is being carried out.
  • the microstructure change process is supported by the heated support device.
  • the temperature of the coil is monitored spatially resolved by means of an optical or tactile heat detector. If local increases in temperature are found that indicate an unrecoverable material defect, the coil can be rejected.
  • step SB the coil removed from the support device is guided into a coating device by means of the movable holding device.
  • the coating device is a powder coating device or an electrodepositioning device.
  • the coil is provided with a cover layer, the coating process being controlled by applying a voltage by means of the electrical current and voltage device.
  • step S4 the coil removed from the coating device with the aid of the holding device is positioned in or on a test device, the test device being the heat detector from S2 or another test device.
  • the current or voltage is again determined by means of the electrical current and voltage Supply provided.
  • the quality of the bobbin is checked and, if necessary, the bobbin is rejected.
  • the coil can also be characterized.
  • step S5 the coil of the holding device and of the current and

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulating Of Coils (AREA)
  • General Induction Heating (AREA)

Abstract

L'invention concerne un procédé de fabrication d'une bobine électrique métallique hélicoïdale (1), le corps de bobine étant d'abord produit sous sa forme géométrique finale. Au moyen du procédé selon l'invention, une alimentation en tension et en courant électrique (2) est reliée au corps de bobine et un profil de tension et courant dans le corps de bobine est commandé de telle sorte qu'une structure qui présente une résistance électrique spécifique inférieure par rapport à l'état initial est obtenue par modification de structure du matériau de la bobine.
PCT/EP2020/073572 2019-09-02 2020-08-21 Procédé de fabrication d'une bobine électrique métallique hélicoïdale WO2021043605A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20761223.5A EP4026151A1 (fr) 2019-09-02 2020-08-21 Procédé de fabrication d'une bobine électrique métallique hélicoïdale

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019213228.6A DE102019213228A1 (de) 2019-09-02 2019-09-02 Verfahren zur Herstellung einer wendelförmigen metallischen elektrischen Spule
DE102019213228.6 2019-09-02

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WO2021043605A1 true WO2021043605A1 (fr) 2021-03-11

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EP (1) EP4026151A1 (fr)
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Publication number Priority date Publication date Assignee Title
DE102020215608A1 (de) 2020-12-10 2022-06-15 Robert Bosch Gesellschaft mit beschränkter Haftung Verfahren zum Herstellen einer Verschaltungsanordnung sowie eine elektrische Maschine

Citations (3)

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Publication number Priority date Publication date Assignee Title
EP1185988A2 (fr) * 1999-05-19 2002-03-13 Oxford Instruments Limited Bobines superconductrices
EP2819276A2 (fr) * 2013-06-25 2014-12-31 Breuckmann GmbH & Co. KG Procédé de fabrication d'une bobine et une telle bobine
US20190260252A1 (en) * 2018-02-16 2019-08-22 Rolls-Royce Plc Metal coil fabrication

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