DE2122366A1 - Method and device for the manufacture of wound capacitors - Google Patents

Description

British. Insulated Callender's Cables limited, 21 Bloomsbury Street,

London W.0.1, England

For this application priority is _{claimed from British patent application No. 0} 22177/70 dated May 7, 1970.

Method and device for manufacturing wound capacitors

The invention relates to a method and a device for manufacturing wound capacitors and concerns above all the production of components for wound capacitors from metallized plastic or plastic films.

A wound capacitor component consists essentially from a roll, which is formed from a composite strip or composite strip, the at least four layers

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having at least two of a dielectric material and at least two of a conductive material exist, wherein the layers of the conductive material are provided alternately with the layers of the dielectric material. The invention relates in particular to the production of wound capacitor components that are composed of a Strips are made during the winding process either from separate metal foils and dielectric Films or made up of two or more metallized dielectric mimes, and the term "composite" strip in the following description, where appropriate, refers to a composite strip which is manufactured or assembled during the winding process.

The main object of the invention is to provide an improved method and apparatus for automatic manufacture of wound capacitor components with a certain capacitance value,

According to the inventive method for producing a winding capacitor component by winding a composite The strip, which consists of conductive and dielectric layers, around a mandrel will have a constant voltage across the conductive layers are applied on their way to the mandrel, with the resulting current flowing into the capacitor element that is produced is, flows in, is integrated, and as soon as the integrated current value corresponds to a predetermined capacitance value, the winding of the assembled strip around the mandrel is preferably stopped automatically.

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To eliminate significant errors that would otherwise be in the built-in current value due to the presence static charge may appear in the conductive layers being wound, preferably the application is made the constant voltage across the conductive layers and the integration of the resulting current flowing into the capacitor component flows, only during the winding of the last few turns of the assembled strip. Preferably will too the speed or rotational speed at which the composite strip is wound, initiatively significantly at one predetermined number of turns of the composite strip, which is slightly below an estimated number of turns of the composite strip, which corresponds to the predetermined capacitance, and the application of the constant voltage the conductive layers and the integration of the resulting current flow into the capacitor component take place during winding the composite strip at this reduced speed, thereby allowing the capacitor device is manufactured with a predetermined capacity within a narrow tolerance «

Alternatively, if the static charge is in the conductive layers of the composite strip is eliminated or it is so small that it has only a negligible effect on the integrated current value exerts, the constant voltage is continuously applied to the conductive layers and the resulting current flow into the capacitor component be continuously integrated during the winding process. Preferably the speed is with which the composite strip is wound is significantly reduced on the initiative if the integrated current has a preselected

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th value that somewhat maintains) the value of the integrated " th current, which corresponds to the predetermined capacitance value, whereby it is achieved that the capacitor component is produced with the predetermined capacitance value within a narrow tolerance will.

The device according to the invention has a mandrel to that a composite strip consisting of conductive and dielectric layers is to be wound; the device furthermore has electrically conductive contact devices which - viewed in the running direction of the assembled strip - are arranged in front of the mandrel and with the conductive layers are in contact when they move towards the mandrel; furthermore devices for applying a constant voltage the mentioned contact devices, devices for integration of the resulting current flowing into the capacitor component while it is being produced, as well as automatically operating Means for stopping the winding of the composite strip when the integrated current value has reached a predetermined value Corresponds to the capacity value.

In all cases where the conductive layers of a composite Strips of metallized dielectric films have become pinholes or pores or imperfections / pinholes / that are in the metallized films during metallizing of the film and / or are formed or arise during the production and transport of the metallized film, Cause short circuits or flashovers between the films if these pinholes or defects are not eliminated be, and in the method according to the invention it is necessary in winding a composite strip comprising two or more metallized dielectric films, any Eliminate pinholes, pores or imperfections while winding a capacitor component.

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If a constant voltage across the conductive layers applied to the conductive layers only during the winding of the last few turns of the composite strip the same or a different constant voltage is applied to the conductive layers while they are being wound, to remove any HadeX holes, pores or defects caused by the Burn off the metal layer to eliminate the short-circuits or short-circuit paths, and just before the current-integrating Device is actuated, this constant voltage is interrupted and the conductive layers are short-circuited, to discharge the component that has been wound so far. If a constant voltage is applied continuously to the conductive layers is applied, any defects are eliminated by this voltage, which the metallization or metal particles burns down from the short-circuit points. When using either method, is to ensure that power surges and their Effects that are caused by the elimination of faults, the current-integrating device not damage and / or not from the power integrator are measured, the device is preferably also equipped with means to avoid current surges that occur when eliminating the Defects generated by the applied constant voltage are diverted away from the current integrating device.

The mandrel is preferably driven about its axis and can in a simple manner comprise a winding spindle, or it can have a winding spindle which is a removable tubular Carries molded part that remains in the capacitor component after it has been wound.

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The electrically conductive contact means for engaging each conductive layer must be of such a design be that they do not injure the conductive layer, and the contact means preferably comprise a roller which has an electrically conductive peripheral surface.

The device according to the invention is for use can be used for both semi-automatic and fully automatic capacitor winding machines, and especially, but not exclusively, for installation in the automatic con-

Fe capacitor winding device suitable, the subject is on 3ο September 1970 filed German patent application P 20 43 628.6 (Attorney's file 70 103), and the device comprises a drive for the Darn, further automatic control devices for Starting and stopping the rotation of the mandrel, means for splitting the leading end of the assembled strip around the mandrel, means for sensing the tension along the length of the assembled strip between the mandrel and a temporarily acting clamp or clamping device / temporary clamp / for the assembled strip and devices to start the automatic control device when, as the mandrel rotates, there is an increase in tension in the said length the scanner as an indication of this

actuates the leading end of the composite strip has been successfully wrapped around the mandrel and secured so that the wrapping process can begin.

The invention will now be further illustrated by drawings. and the description of exemplary embodiments of the invention Device explained to modify or supplement

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a capacitor winding machine is used, so that the machine for the production of wound capacitor components can be used with a predetermined capacity value, as well as by describing two methods of operating it supplemented or modified machine to wound capacitor components with a predetermined capacity from two propylene films manufacture, each metallized on a surface around a narrow, non-metallized edge to leave one edge free.

The invention will now be explained with reference to the drawing showing it for example, namely shows

Fig. 1 is a fragmentary schematic representation of the device according to the invention,

Fig. 2 shows the preferred embodiment of the control circuit of the device, while

Fig. 3 shows various waveforms of the voltage in the Circuit illustrates when the second of the two modes of operation is in progress.

1 shows two metallized dielectric films 18, 19 which are held on spindles 3, 4 by supply rolls 6, 7 are, each run over the guide roller 16 and the dancer roller of a tension monitoring device 12, 13 and through a celebrated leadership role can be united to form a compound Strip or a composite band 20 to form a mandrel 1, which is about its axis by a not shown Motor is driven to rotate, fed and wound onto this mandrel. The guide roller 16 and the Dancer roll 17 on each tension control device 12, 13 are

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plated with rhodium and provided with contact brushes (not shown) to form an electrically conductive contact device for each metallized dielectric PiIm 18 and 19. The spindles 3 _t 4 and the Zugspannurigskontrollgeräte 12, 13 are with respect to the machine electrically insulated-peak, the guide roller 11 and any other non-illustrated part of the machine, which communicates with the composite strip or tape 20 in contact respectively with coated with a layer of insulating material. The device also includes counting means, not shown, for counting the number of turns which are wound on the mandrel 1 or for measuring the length of the composite strip which is wound on the mandrel. ·

Two methods of operating the device are described below with reference to the control circuit shown in Fig. 2 described. In the first method of operation, after the feeding end of the composite strip 20 is attached to the mandrel 1 has been attached and the rotation of the thorn begins to To wrap the assembled strip around the mandrel, a constant voltage of 100 volts between rollers 16 and 16 of the tension control device 12 and the rollers 16 and 17 P of the tension control device 13 applied, wherein the initial surge current in the conductive layers is used to disturb or to eliminate imperfections in the free linden of the assembled strip. This constant tension is over the voltage control devices 12 and 13 are maintained during the winding of the capacitor component, and this voltage serves to close any pinholes or flaws / pin holes / in the metallized, dielectric films

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eliminate (self-heal), with current surges which would otherwise damage an integrator 30 and which with such an elimination of pinholes or flaws arise, are diverted by diodes 28, which at currents that normally occur in the metallized, dielectric films flow, not guide. Before the winding of the capacitor component is finished, the counting device is actuated / counting device / at a predetermined number of revolutions of the dome 1, as indicated by the counting device a transistorized circuit to slow down the mandrel 1 to a lower winding speed to effect, and when this slow speed has been reached, a signal actuates a relay which turns off the voltage applied to the tension control devices 12, 13, and the metallized films 18, 19 over the short-circuit section 29 short-circuits / after a predetermined side delay opens a relay, a current-limiting circuit 31 is put into operation, the voltage of 100 YoIt becomes reapplied to the tension control devices 12 and 13 and the current integrating device 30 is automatically switched on, that by changing the value of a standard comparator can be set in the device. To at a value de3 integrated current which corresponds to a predetermined capacitance value for a capacitor component that is wound should be to take action. The current flowing into the capacitor component is passed through the integrating device 30 integrated, the output of which has a voltage that is proportional to the electrical charge that is in the Condenser component has flowed in. If the value of the

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integrated current corresponds to the predetermined capacitance value, If a tranaiatorisiert circuit 26 actuates a relay, uia to stop the Born 1 »furthermore ma switch off the voltage supply and initiate a signal! that de » Work step of wrapping or dressing or cutting edge of the wound component introduces «In dem in dem the γ / iokelmaschine of that of the aforementioned patent application corresponds, this signal can indicate the age of the operations or Workflows for winding a »üWitilluögsfilaes us daö wiokelte Effect component.

Since the Stromflul is only integrated into the EoridensatorfBauelement, while relatively few turns de "at **" sammengesetzten strip 20 waxed disgusted w $ r (| in _r z "B # nöhrend the last zehii walls of a component," which nearly vierhundertaiebgjig turns of ztaamaiengesetzten strip .., an error in the capacity of the component ©, which is triggered by any static iaduttg in the composite strip, becomes insignificant. - ] ment flowing current is integrated, vtrhindirEts deS: "what iTadellUofter or error point» while the integration process of the fioklungteils / winding oyole / are eliminated, but the possibilities of the occurrence of hadel holes or ·: fault spots over the last few The turns of the assembled strip 20 are not very large and can be taken in K.

Since the number of turns of all capacitor components that are wound using this working method,

is within the size range limited by the speed at which the mandrel 1 starts, slower to run, and the speed at which the mandrel 1 is automatically stopped, it is normally not possible to a To produce capacitor component with a capacitance value which is unacceptable from the predetermined Capacity value differs. A bad job To prevent the machine, the counter is preferably set in such a way that the drive motor for the mandrel 1 closes stop regardless of the value of the integrated current when the number of turns on the mandrel is a fixed one maximum value reached.

Another alternative method of operation of the control loop, which is suitable when there is any static charge in the assembled strip 20 has been eliminated or is so small that any fences that affect the capacitance value of a component are not significant, the integrating circuit is automatically switched on when the constant »initial tension between the tension monitors 12 and 13 is applied, and the current flowing into the capacitor device becomes continuous integrated during the wrapping process. If the value of the integrated current is slightly below the value of the integrated btromes is the predetermined capacitance value of the component corresponds, the output or output value of an integrating device 30 actuates a circuit 27ι the one transistorized circuit moved iransistor circuit 25 in Operation sets that actuates a relay to cause the speed of the dome 1 to be significantly reduced.

If the "iert dis integrated current corresponds to the pre-prepared: '. ap .- /. ity value, a further trunnifiDriertc r circuit 26 actuates a relay in order to stop the mandrel 1, in order to also switch off the voltage supply and an oign- i, l to trigger the final wrapping operation.

Current surges caused by the elimination of any loading holes or defects in the metallized dielectric films which run over the rollers 16 and 17 of the supply voltage monitoring devices 12 and 13 are diverted by diodes 2β, which at Do not conduct currents that normally mend in the meshed dielectric film. Impulses through j-adellöcher or. Imperfections or the continuous u ^ roni'luß hit tin ·. · ./Ert äbernalb a vorbestimuten Lcjci.:i"l./ert y, 'J.. 1 Lilliamperc, arise, v / ground by a rapidly responding circuit 22 diverted.

, ienn a ^ adelloch b2w. If a fault occurs, the capacitor component, which was manufactured by v / ira, also discharges into the same. Since the capacitor component has been partially discharged, it must be recharged, but because of the time-constant effect of the circuit and the capacitor component, the value of the recharging current will fall below the preselected maximum value and consequently v / ith the Init _r; riervorrichtung be set in operation 30, thus a false reading or "an incorrect measured value is formed in order and allowed value to avoid such a false reading of such a false, the circuit 21 is provided to the integrator.

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switch off device 30 for a certain time delay, after the impulse from a pinhole or a flaw originates, has occurred.

The waveforms of the voltage according to Pig. 3 are waveforms at points marked (a) through (f) in the circuit shown in FIG. The multiple form (u.) Represents the voltage at the voltage monitoring device 12, v / out of round the other voltage monitoring device 13 is kept at an voltage of 100 7. The Ilaximalspaimung, which results from the elimination of a fault, is limited to a voltage of 0.8 Y, since the current is diverted through the diodes 23. When it decreases, this voltage is proportional to the recharging current of the capacitor component and is decreasing to a value proportional to the normal charging current in approximately 5 milli-ums, which represents the period of time after which a fault occurs occurs during which the integrator 30 is turned off. The wave forms (b) and (c) are the wave forms of the voltages at the. Points (b) and (c) in the Zeitverzögerungssclialtung that the switch-off or. Show hold-open pulse; Figure form (d) illustrates the operation of the diodes 28 when the fast response circuit 22 is actuated; the waveform (e) is the waveform of the voltage proportional to the current ifit integrated by integrator 30; and waveform (f) represents the voltage output of integrator 30 and shows that there is no change in voltage output during the 5 millisecond time delay in which a fault is cleared and the capacitor device charges. In practice

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it has been found that with the number of Jadellöohern "or defects that normally occur in the lengths of metallized dielectric films that form a Capacitor components are wound, capacitor components with a predetermined capacitance value within can be wound to a tight tolerance.

As a precaution against a prolonged fault or an unusually high number of needle holes or imperfections in a length of the metallized dielectric film is the tachometer showing the number of the revolutions of the mandrel 1 and which can be used to stop the mandrel, so set, and to operate at a speed to allow a high tolerance and the time delay of the circuit 21 is from dimensioned such a duration that the integrating device 30 will read or tap less current than necessary, to charge the capacitor component. This leads to a capacitor component that has a capacitance value which is above the capacitance value corresponding to the v / ert of the integrated current, and in extreme cases the Tachometer bring the machine to a standstill.

Through the automatic winding of a capacitor component with a predetermined Kapazxtätswert using the method according to the invention and the inventive Device can capacitor components with a desired Capacitance value can be produced within a tight tolerance, with a significant saving in material

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is achieved on composite strips or bands. In cases where the composite strip comprises two or more metallized dielectric films, the same is true Method according to the invention and the device according to the invention to a substantial extent any changes in the thickness of the dielectric film occurring along it Length can occur.

The invention also relates to modifications of the embodiment outlined in the appended claim 1 and provides above all on deplorable identifying features, lie individually - or in combination - throughout Description and context are disclosed.

Claims

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Claims (12)

Claims 1J Process for the production of a wound capacitor component with a predetermined capacitance value by winding a composite strip or tape, which consists of conductive and dielectric layers, around a mandrel, characterized in that a constant voltage is applied to the conductive layers as they move towards the mandrel, that the resulting current, which flows into the capacitor component during manufacture, is integrated, and that the winding of the composite strip around the mandrel is stopped when the integrated Current value corresponds to the predetermined capacitance value. 2. The method according to claim 1, characterized in that the speed at which the composite Strip is wound, is significantly reduced after a predetermined number of turns of the composite Strip or tape has been wound. Process according to Claim 1 or 2, in which the conductive layers of the composite strip consist of metallized dielectric films, characterized in that a constant voltage is applied to the metallized layers of the dielectric films before the speed of the composite strip is slowed down 10984871309 OHJQiNAL INSPECTED is applied to any pinholes or flaws eliminate / pin holes / while the assembled strip moves towards the mandrel, that this constant voltage is furthermore interrupted, and that the metallized layers are short-circuited in order to discharge the component so far wound before a voltage is applied to the moving, metallized layers and the resulting current is integrated will. 4. The method according to claim 1, characterized in that that the constant voltage is applied to the conductive layers and that the resulting current flowing into the capacitor component in the production of the same flows, is continuously integrated during the winding process. 5. The method according to claim 4, characterized in that the speed at which the composite strip is wound, is substantially reduced when the integrated current reaches a predetermined value, which is just below the Value of the integrated current which corresponds to the predetermined capacitance value. 6. The method of any one of claims 3 to 5, wherein the conductive layers of the composite strip are composed of metallized, dielectric film and the applied voltage any pinholes or flaws in the metallized layers eliminated, characterized in that the current surges involved in eliminating the pinholes or defects are caused by the current integrators be diverted away. 7. The method according to one or more of the claims 1 to 6, characterized in that the winding of the composite The strip around the mandrel is stopped automatically. 109848/1309 8. Apparatus for the automatic production of wound capacitor components with a predetermined capacitance value, comprising a mandrel around which is wrapped a composite strip made up of conductive and dielectric layers consists, characterized in that the device has electrically conductive contact devices (12, 13), which before the Mandrel are arranged and .zu a contact with the conductive layers (18, 19) serve as they move towards the dome; further devices (30) for Integrate the resulting current that flows into the capacitor component during its manufacture, as well as automatic Means (26) for stopping the winding of the composite strip when the integrated current value equals the predetermined capacitance value. 9. Apparatus according to claim 8, characterized in that the mandrel (1) is rotatably driven about its axis and that the automatic device is suitable to stop the rotation of the dome when the integrated current value the corresponds to a predetermined capacity value. 10. The device according to claim 9 »characterized in that the same automatic control devices for starting and Stopping the rotation of the mandrel; also facilities for folding the leading end of the assembled strip around the mandrel; Devices for sensing the tension in the length of the assembled strip between the mandrel and a temporarily acting clamp or clamping device for the joined strips as well as fixture services for putting the automatic control devices into operation if, during the rotation of the mandrel, there is an increase in the Tensile stress of said length is affecting the scanners as an indication that the leading end of the The assembled strip has been successfully folded around the mandrel so that the winding process can begin «. 1 0 9 8 A 8/13 0 9 11. Device according to one or more of the Claims 8 to 10, characterized in that devices (28) are provided to prevent current surges which occur during the elimination the pinholes or felling points through the created constant voltage are diverted away from the current integrating devices. 12. Device according to one or more of the claims 8 to 11, characterized in that the electrical conductive contact devices that communicate with the conductive Layers are in contact, rollers (16, 17) with one Have electrically conductive peripheral surface. 109848/1309 Blank page