EP0309690B1 - Transformer or inductance with yoke-side clamping supports to be clamped together by tie-rods, and method of manufacturing such transformer or inductance - Google Patents

Description

Transformer or choke with yoke package-side tensioning supports that can be braced against one another by tie rods and method for producing the transformer or choke

The invention relates to a transformer or a choke with yoke package-side tensioning supports which can be braced against one another by tie rods, and to a method for producing the transformer or choke according to the preamble of claim 14; such a transformer is known from DE-A-28 30 128.

In the case of the known DE-A-28 30 128, the two core halves are clamped against each other in the sense of a high mutual pressure of the cut surfaces by U-shaped, the side surfaces of the core at a distance from this overlapping pressure parts with laterally bent feet, which act as a support for lag screws serve.

From DE-C-898 205 a device for holding together lamella stacks is known, in which the tensioning supports and the tie rods comprise the core as rigid members, the tie rods engaging the tensioning supports outside the bent-up flanges and the mutual spacing of the rigid flanges one Clamping support is selected such that the core package to be accommodated can only be inserted as a compressed stack of lamellae between the bent-up flanges.

GB-A-669 296 discloses a core composed of two yoke packages and an intermediate core package, which is held together by clamping jaws with elastically flexible flanges bent in an S-shape on all four sides, that a clamping plate encompasses both yokes and the intermediate core package on both sides; there is no further mechanical connection between the clamping plates.

According to the object of the present invention, it should be possible to create a maximum of variable, customer-specific designs in a simple manner in terms of production and assembly technology with a minimum of assembly time and components.

This object can be achieved with a transformer or a choke of the type mentioned at the outset by the teaching of claim 1; advantageous embodiments of the invention are the subject of the dependent claims.

The transformer or choke design according to the invention allows, in a so-called surface mounting method, a simple stamped and bent sheet metal part for the clamping plates, which is produced as a universal component and can be used for different designs, first of all the layers and alignment of the sheets of the lower yoke stack and after they have been put on of the leg packs provided with the slipped-over spools, the placing of the upper yoke pack and the subsequent mutual dimensionally correct bracing of the upper and lower clamping plate with the core parts by means of the pull rods, the first stacking and pressure jaws previously serving as a stacking aid to achieve a fixed yoke pack against the side surfaces of the Sheets of the yoke package can be pressed on. Advantageously, according to a first embodiment of the invention, the first stacking and pressure jaws consist of flange-like projections stamped onto the stack support surface and bent in a U-shape, the ends of which protrude into the stack support surface and accommodate the pull rods and the free ends of the ends of the pull rods against the pull of the pull rods Longitudinal surfaces can be pressed. This results in a special one Simple possibility, on the one hand, to bend the end edges away to the side while stacking and to release the stacking space for the sheets of the yoke packages to be placed upright on the stack support surfaces and, on the other hand, to ensure great pressure on the longitudinal side surfaces of the sheets when the pull rods are tightened due to the elastic bending back of these end edges.

A particularly firm and secure pressure fit of the stacking and pressure jaws on the longitudinal side surfaces of the sheets of the yoke packs when tightening the pull rods can be achieved in that, according to a further embodiment of the invention, the first stacking and pressure jaws are punched out of the stack support surface and bent in an S-shape there are flange-like projections, the free end legs of which are bent away from the longitudinal side surfaces receive the tie rods and whose middle legs are bent towards the longitudinal side surfaces and can be pressed against the longitudinal side surfaces under the pull of the tie rods. A simple elastic expansion of the middle leg during the stacking of the yoke packet lamellae on the one hand or a simple pressing after stacking with targeted elastic reshaping of the previously widened first stacking and pressure jaws with simultaneous high pressing force on the longitudinal side surfaces on the other hand can advantageously be achieved in that the S-shaped projections are bent in such a way that their middle legs are pressed against the longitudinal side surfaces only in the bending area of the free end legs protruding laterally from the yoke assembly, or that in the transition area to the free end legs the middle legs are flexurally stiffened and / or dimensionally stabilized by molded beads.

In order to be able to achieve an alignment function on the sheets of the yoke packets from their end faces at the same time with little effort during assembly, a simple manufacturing process according to an embodiment of the invention is available the stack support surfaces laterally stamped and bent on the second stack jaws, between which the sheets of the yoke packs can be inserted with their front-side contact.

In a technically less complex manner, the clamping plates can simultaneously be used either for a standing or a hanging holder of the transformer or the choke in that the stack support surfaces with integrally punched and / or bent suspension straps for hanging storage or with bent-out foot supports facing away from the yoke package. Contact surfaces are provided.

According to a further embodiment of the invention, earthing lugs as well as further fastening lugs for holding electrical attachments, in particular top-hat rails, are additionally stamped onto the stack support surfaces and bent into the desired position.

FIG 1

eine Vorderansicht einer ersten Ausführung eines dreiphasigen 3UI-Transformators,

FIG 2

den Transformator gemäß FIG 1 in Ansicht II-II,

FIG 3

eine Draufsicht auf den Transformator gemäß FIG 1,

FIG 4

in einem Detailauschnitt den Transformator gemäß FIG 2 im Bereich der unteren Stapel- und Druckbacken,

FIG 5

eine Vorderansicht einer zweiten Ausführung eines dreiphasigen 3UI-Transformators,

FIG 6

den Transformator gemäß FIG 5 in Ansicht VI-VI,

FIG 7

eine Draufsicht auf den Transformator gemäß FIG 5,

FIG 8

in einem Detailauschnitt den Transformator gemäß FIG 6 im Bereich der unteren Stapel- und Druckbacken.

The invention and further advantageous refinements of the invention are explained in more detail below with reference to two schematically illustrated exemplary embodiments in the drawing; show in it:

FIG. 1

2 shows a front view of a first embodiment of a three-phase 3UI transformer,

FIG 2

1 in view II-II,

FIG 3

2 shows a plan view of the transformer according to FIG. 1,

FIG 4

in a detail section the transformer according to FIG. 2 in the area of the lower stacking and pressure jaws,

FIG 5

3 shows a front view of a second embodiment of a three-phase 3UI transformer,

FIG 6

5 in view VI-VI,

FIG 7

5 shows a plan view of the transformer according to FIG. 5,

FIG 8

in a detail section of the transformer according to FIG 6 in the area of the lower stacking and pressure jaws.

The 3UI transformers shown in both exemplary embodiments essentially consist of three leg packs 3, 4, 5 provided with attached coils, which are connected between an upper yoke pack 1 and a lower yoke pack 2 by means of tie rods 8, 8 or 9, 9 and between the tie rod nuts and the top of the yoke packs 1.2 arranged clamping plates 6.7 are braced against each other.

In the so-called surface mounting of the transformer according to the invention, the clamping plate 7, designed as a simple stamped and bent sheet metal part, is first placed on a mounting base as the lower clamping support. In the lower clamping plate 7, the sheets of the lower yoke stack 2 are placed upright on the stack support surface 71. Then the three leg packs 3, 4, 5 with the plugged-on coils are placed on the lower yoke pack 2. The upper yoke packet 1 and then the upper clamping plate 6 are placed on the leg packs 3, 4, 5, and the stacking surface 61 then rests on the sheets of the upper yoke packet 1. Then the two clamping plates 6, 7 are tightened by means of the tie rods 8, 8 and 9, 9 by pulling the tie rod nuts 81, 82 and 91, 92, respectively, in order to further reduce the number of components at one end of a tie rod instead of a tie rod nut in an advantageous manner a tie rod button can be stamped in one piece, braced against one another and the entire core package firmly joined together.

According to the invention, the clamping plates 6, 7 are easy-to-produce, one-piece stamped and bent sheet-metal parts with a stack contact surface 61 or 71, lateral, one-piece, stamped, high-arched first stacking and pressure jaws 62, 63 or 72, 73 according to FIGS. 1-4 or first stacking and pressure jaws 64,65 and 74,75 according to FIG. 5-8 and also with stamped and bent second stacking jaws 66,67 and 76,77. The first stacking and pressure jaws serve as assembly aids for surface mounting for the sheets of the lower yoke stack 2 to be layered in parallel to the first stacking and pressure jaws with their long sides. The lateral second stacking jaws abut the sheets of the lower yoke stack 2 on the end face and thus serve to align them longitudinally. In the same way, the first stacking and pressure jaws as well as the second stacking jaws of the upper clamping plate 6 serve as a stacking and / or alignment aid for the upper yoke package 1 before the two clamping plates 6, 7 are mutually clamped. To further increase the strength, the stacking jaws can also be welded to the core sheets.

According to the first exemplary embodiment shown in FIGS. 1-4, the first stacking and pressure jaws 62, 63 and 72, 73 consist of flange-like projections which are stamped onto the stack support surface 61 and 71 and bent in a U-shape, the ends of which protrude into the stack support surface Record tie rods 8.9 and their free ends can be pressed with their front edges under the pull of the tie rods against the long side surfaces.

According to the second exemplary embodiment shown in FIGS. 5-8, the first stacking and pressure jaws 64, 65 and 74, 75 consist of flange-like projections stamped onto the stack support surface 61 and 71, respectively, and their free end legs bent away from the longitudinal side surfaces take up the tie rods 8.9 and their middle legs bent towards the longitudinal side surfaces can be pressed against the longitudinal side surfaces under the pull of the tie rods 8.9.

The first stacking and pressure jaws can, for example, according to FIG. 5, 7 as axially continuous stacking and pressure jaws 64, 74 or 65.75 or, for example, according to FIG or 63.73.

Before being braced by means of the tie rods 8, 9, the stacking and pressure jaws can each be bent sideways in such a way that the sheets of the yoke stack can be freely inserted. After the pull rod nuts 81, 82 and 91, 92 have been tightened in the sense of a tensile force F1, F1, the first stacking and pressure jaws are pressed in the sense of a compressive force F2, F2 on the longitudinal side surfaces of the sheets of the yoke packs 1, 2. In the case of the second exemplary embodiment according to FIG. 5-8, a shape-reinforcing bead in the transition area between the middle leg and the free end leg receiving the tie rods advantageously ensures that the S-shaped projections in this area remain dimensionally stable when bending the stacking path and during subsequent pressing back however, in the non-form-reinforced transition region of the middle leg into the other end leg of the S-shaped projection, they can be elastically deformed by a little.

Advantageously, the first stacking and pressure jaws - as can be seen in particular from FIG. 2 or FIG. 6 - serve simultaneously as a fastening for a top-hat rail 10, which e.g. Contacts between the coil winding ends and the outer connecting lines. In the same way, e.g. a receptacle for an earthing lug 615 is also stamped or molded onto the stack support surface 61.

The clamping plates 6, 7 can be provided in a simple and advantageous manner as a universal component for both a standing and a hanging fastening of the transformer by hanging brackets 611, 612, 613, 614, 614 on the stack support surfaces 61 and 71 for hanging attachment and foot support surfaces facing away from the yoke package 78,79 are punched out and / or bent for a standing installation. In order to ensure, on the one hand, a standing support unaffected by the tie rod nuts or tie rod heads 82, 92 and, on the other hand, to ensure good accessibility to the tie rod nuts 81, 91 can, according to one embodiment of the invention, the tie rod nuts or tie rod heads screwed onto the end of the tie rods are provided outside the foot support surfaces 78, 79 and opposite them axially deeper on the outside of the stack support surface 61 and 71, respectively.

The clamping plates according to the invention produced as a simple sheet metal stamped and bent part can therefore fulfill a multiple function. The stacking support surfaces, together with the first and second stacking and pressure jaws, serve as a stacking and alignment aid when assembling the yoke packs, the same clamping plate design with its stamped, bent mounting brackets and foot support surfaces enables both hanging and standing mounting of the transformer, further mounting options for electrical Components and earthing connections can be provided in a simple manner.

• a) Einstecken der Lamellen des unteren Jochpaketes 2 zwischen die ersten Stapel- und Druckbacken 72,73 mit gleichzeitiger Auflage auf die Stapelauflagefläche 71 der unteren Spannplatte 7;
• b) Aufbringen der bewickelten Schenkelpakete 3,4,5 auf das untere Jochpaket 2;
• c) Einstecken der Lamellen des oberen Jochpaketes 1 zwischen die ersten Stapel- und Druckbacken 62,63 mit gleichzeitiger Auflage auf die Stapelauflagefläche 61 der oberen Spannplatte 6;
• d) Aufbringen des oberen, in der Spannplatte 6 gehaltenen Jochpaketes 1 auf die Schenkelpakete 3,4,5;
• e) Durchstecken der Zugstangen durch die oberen bzw. unteren ersten Stapel- und Druckbacken 62,63 bzw.72,73 und gegenseitiges Festspannen der Zugstangen 8,9 bei gleichzeitigem Andrücken der ersten Stapel- und Druckbacken gegen die Längsseitenflächen der Bleche der Jochpakete 1,2.

A method for producing the transformer according to the invention in a so-called surface mounting is characterized by the following successive method steps:

• a) inserting the slats of the lower yoke package 2 between the first stacking and pressure jaws 72, 73 with simultaneous support on the stack support surface 71 of the lower clamping plate 7;
• b) applying the wound leg packs 3, 4, 5 to the lower yoke pack 2;
• c) inserting the lamellae of the upper yoke stack 1 between the first stacking and pressure jaws 62, 63 with simultaneous support on the stack support surface 61 of the upper clamping plate 6;
• d) applying the upper yoke package 1 held in the clamping plate 6 to the leg packages 3, 4, 5;
• e) pushing the pull rods through the upper or lower first stacking and pressure jaws 62, 63 and 72.73 and mutually tightening the pull rods 8.9 while simultaneously pressing the first stacking and pressure jaws against the longitudinal side surfaces of the sheets of the yoke packs 1, 2nd

Claims (14)

1. Transformer or inductor with clamping supports which are on the yoke packet side and which can be clamped together by tie-rods (8, 9) with flanges which are laterally bent up and which extend along the longitudinal side faces of the plates of the yoke packets (1, 2), by means of which clamping supports the adjacent discrete yoke packets (1, 2) formed from lamellar stacks and the discrete limb packets (3, 4) of the transformer core arranged between said yoke packets can be joined to form a fixed connection, with the clamping supports each being formed of a clamping plate (6 and 7 respectively) which is formed as a stamped-bent plate portion with a stack-supporting area (61 and 71 respectively) for the plates of the yoke packets (1, 2) supported in upright manner and lateral first stack and pressure jaws (62, 63; 72, 73 and 64, 65; 74, 75 respectively) which are stamped thereon in one piece and bent away and between which the plates of the yoke packets (1, 2) can be stacked with contact on the longitudinal side for the purposes of construction assembly, characterised in that the stack and pressure jaws are formed in such a way that they can be pressed under the tension of the tie-rods (8, 9), which can be fixedly clamped, against the longitudinal side faces of the plates of the yoke packets (1, 2).
2. Transformer or inductor according to claim 1, characterised in that the first stack and pressure jaws (62, 63 and 72, 73) consist of flange-like projections which are bent away in a U-shaped manner and the ends of which, turning into the stack-supporting area, receive the tie-rods (8, 9) and the free ends of which can be pressed with their front edges under the tension of the tie-rods against the longitudinal side faces. (Figures 1 to 4)
3. Transformer or inductor according to claim 1, characterised in that the first stack and pressure jaws (64, 65 and 74, 75) consist of flange-like projections which are bent away in an S-shaped manner and the free end limbs of which, bent away from the longitudinal side faces, receive the tie-rods (8, 9) and the central limbs of which, bent towards the longitudinal side faces, can be pressed under the tension of the tie-rods (8, 9) against the longitudinal side faces.
4. Transformer or inductor according to claim 3, characterised in that the S-shaped projections are bent away in such a way that their central limbs are only pressed against the longitudinal side faces in the bent-away area of the free end limbs which project laterally from the yoke packet.
5. Transformer or inductor according to claim 3 and/or 4, characterised in that in the region of transition to the free end limbs, the central limbs are flexurally reinforced and/or stabilized dimensionally by means of moulded beads.
6. Transformer or inductor according to one of the claims 3 to 4, characterised in that the projections have interspaces which are freely stamped between the receivers of the tie-rods (8, 9).
7. Transformer or inductor according to one of the claims 1 to 6, characterised in that the stack-supporting areas (61 and 71) are provided with second stack jaws (66, 67 and 76, 77 respectively) which are stamped thereon laterally in one piece and are bent away and between which the plates of the yoke packets (1, 2) can be stacked with the face in contact.
8. Transformer or inductor according to one of the claims 1 to 7, characterised in that the stack-supporting areas (61 and 71) are provided with securing clips which are stamped thereon in one piece and/or are bent away for the purpose of receiving electrical terminal portions, in particular top-hat rails (10).
9. Transformer or inductor according to claim 8, characterised in that the first stack and pressure jaws (62, 63 and 72, 73) are also used as securing clips for the holding support of electrical add-on portions, in particular top-hat rails (10).
10. Transformer or inductor according to one of the claims 1 to 9, characterised in that the stack-supporting areas (61 and 71) are provided with earthing clips (615) which are stamped thereon in one piece and/or are bent away.
11. Transformer or inductor according to one of the claims 1 to 10, characterised in that the stack-supporting areas (61 and 71) are provided with suspension clips (611, 612, 613, 614 and 711, 712, 713, 714 respectively) which are stamped thereon in one piece and/or are bent away for a suspended holding support.
12. Transformer or inductor according to one of the claims 1 to 11, characterised in that the stack-supporting areas (61 and 71) are provided with base-supporting areas (68, 69 and 78, 79 respectively) which are remote from the yoke packets and are bent out.
13. Transformer according to claim 12, characterised in that the nuts (81, 82 and 91, 92) which are screwed onto the tie-rods (8, 9) on the end side are supported outside the base-supporting areas (68, 69 and 78, 79 respectively) and relative to the latter so as to lie axially deeper on the outside of the stack-supporting area (61 and 71 respectively).
14. Method for producing a transformer in a construction assembly according to one of the claims 1 to 13, characterised by the following successive method steps:

    a) insertion of the lamellae of the lower yoke packet (2) between the first stack and pressure jaws (72, 73 and 74, 75 respectively) with simultaneous support on the stack-supporting area (71) of the lower clamping plate (7);

    b) application of the wound limb packets (3, 4, 5) to the lower yoke packet (2);

    c) insertion of the lamellae of the upper yoke packet (1) between the first stack and pressure jaws (62, 63 and 64, 65 respectively) with simultaneous support on the stack-supporting area (61) of the upper clamping plate (6);

    d) application of the upper yoke packet (1) held in the clamping plate (6) to the limb packets (3, 4, 5);

    e) plugging of the tie-rods through the upper and lower first stack and pressure jaws (62, 63 and 72, 73 respectively) and mutual fixed clamping of the tie-rods (8, 9) whilst simultaneously pressing the first stack and pressure jaws against the longitudinal side faces of the plates of the yoke packets (1, 2).

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