EP0461829B1 - Method of making a transformer core - Google Patents

Method of making a transformer core Download PDF

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Publication number
EP0461829B1
EP0461829B1 EP19910305192 EP91305192A EP0461829B1 EP 0461829 B1 EP0461829 B1 EP 0461829B1 EP 19910305192 EP19910305192 EP 19910305192 EP 91305192 A EP91305192 A EP 91305192A EP 0461829 B1 EP0461829 B1 EP 0461829B1
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EP
European Patent Office
Prior art keywords
packet
strips
belt
strip
arbor
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Expired - Lifetime
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EP19910305192
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German (de)
English (en)
French (fr)
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EP0461829A1 (en
Inventor
William Kirk Houser
Willi Klappert (Nmn)
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General Electric Co
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General Electric Co
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Publication date
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Publication of EP0461829A1 publication Critical patent/EP0461829A1/en
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Publication of EP0461829B1 publication Critical patent/EP0461829B1/en
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    • 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
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0213—Manufacturing of magnetic circuits made from strip(s) or ribbon(s)
    • H01F41/0226—Manufacturing of magnetic circuits made from strip(s) or ribbon(s) from amorphous ribbons
    • 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
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0233—Manufacturing of magnetic circuits made from sheets
    • H01F41/024—Manufacturing of magnetic circuits made from deformed sheets

Definitions

  • This invention relates to a method of making a core for an electric transformer that comprises a plurality of strips of amorphous steel wrapped in superposed relationship about the window of the core and, for example, relates to a method of this type that employs a belt nester for wrapping packets made from groups of such strips about a rotatable arbor that is rotated as the packets are wrapped thereabout.
  • a belt nester comprises a rotatable arbor about which sections of magnetic strip steel of controlled length are wrapped in superposed relationship as the arbor is rotated, thereby building up a core form that increases in diameter as additional strips are wrapped about those previously wrapped. Wrapping of the strips is effected by use of a flexible belt that encircles the arbor and is driven to cause rotation of the arbor and any strips previously wrapped about the arbor.
  • Strips are fed into the belt nester in such a manner that they enter between the arbor and the encircling belt; and as the belt and arbor move together, each entering strip, or group of strips, is forced by the belt to tightly encircle the arbor or any core form already built up upon the arbor.
  • An example of a belt nester of this type is disclosed in U.S. patent 3,049,793-Cooper.
  • Belt nesters of the above type have heretofore been used for making cores that comprise strips of amorphous steel that are wrapped about the rotating arbor. Because the amorphous strips are very thin (e.g., typically only about 1 mil in thickness), it is customary and highly desirable to feed them into the belt nester in groups, each group being at least ten strips in thickness. But one problem that is present when a belt nester is used with groups of amorphous steel strips is that during the nesting process the strips tend to slide about within the group and on the rotatable arbor or on the rotating partially-built up core form, and this is a serious problem because these strips must be precisely and predictably located.
  • the assignee of the present invention has covered the strips, just prior to belt nesting, with a volatile liquid such as perchloroethylene that is capable of holding the strips together in the manner required for effective belt nesting.
  • a volatile liquid such as perchloroethylene that is capable of holding the strips together in the manner required for effective belt nesting.
  • the liquid later evaporates. This, however, is not an entirely satisfactory approach because the perchloroethylene is expensive, is environmentally undesirable, and can produce rust or corrosion problems.
  • US-A-4741096 discloses a transformer core made by winding a strip of amorphous metal on a winding mandrel to form a first annulus and cutting once through this annulus to create a plurality of individual laminations which are then assembled in packets about a nesting mandrel of a smaller diameter than the winding mandrel to form a second annulus.
  • Each packet consists of a predetermined number of groups of laminations, with the ends of each lamination group lapping each other to form a lap-joint.
  • a problem with this arrangement is that since the transformer core is formed from a single strip of amorphous steel, which reduces the bulk strength of the groups.
  • the present invention provides a method of making a transformer core comprising strips of amorphous steel wrapped about the window of the core, comprising the steps of: (a) providing a plurality of reels of amorphous steel strip; (b) unwinding the strips from said reels and combining the unwound strips into a composite strip in such a manner that juxtaposed strips in the composite strip are from different reels; (c) cutting said composite strip; (d) forming from said sections of composite strip groups of strips, each group comprising one or more sections of composite strips, the strips in each group having substantially.
  • a belt nester that comprises (i) a rotatable arbor and (ii) wrapping means comprising a belt extending about said arbor for wrapping said groups in superposed relationship about said arbor as the arbor is rotated, thereby building up a core form about said arbor.
  • Illustrative embodiments of the invention as disclosed herein seek to provide, for making a transformer core of amorphous steel strips extending about the core window, a method that is capable of being effectively carried out with a belt nester having a rotatable arbor about which are wrapped amorphous steel strips fed into the belt nester in groups; and/or a method that requires no liquid for holding the amorphous steel strips together while they are being wrapped about the arbor.
  • each packet being made up of superimposed groups of amorphous steel strips and each group being made up of at least one section of multiple-layer amorphous steel strip.
  • the sections of amorphous steel strips are derived by cutting to controlled lengths a composite strip of amorphous steel strip that has been made up by combining multiple-layer thickness strips derived from a plurality of master spools.
  • the multiple-layer thickness strip in each of these master spools is made by a pre-spooling operation in which a pre-spooling machine takes a plurality of mill-wound spools of single layer thickness strip and combines strips from such mill-wound spools to form said multiple-layer thickness strips in said master spools.
  • Fig. 1 is an enlarged side elevational view of a packet of amorphous steel strips representative of many such packets that are used in carrying out our method.
  • Fig. 2 is a plan view of the packet shown in Fig. 1.
  • Fig. 3 is a partially schematic side elevational view of a belt nester used for building up a core form from a plurality of packets of the type depicted in Figs. 1 and 2. A portion of one of the guide flanges of the belt nester is broken away.
  • Fig. 4 is a sectional view along the line 4-4 of Fig. 3.
  • Fig. 4A is an enlarged view of a portion of Fig. 3 without any breaking away of the guide flange.
  • Fig. 5 is a sectional view along the line 5-5 of Fig. 4A.
  • Fig. 6 is a schematic showing of a pre-spooler in which single layer thickness strip is unwound from five starting spools of amorphous steel strip and combined into multi-layer thickness strip that is wound onto a master spool.
  • Fig. 7 is a schematic showing of apparatus that combines multiple-layer thickness strip unwound from four master spools into a composite strip that is fed forward and sheared into lengths of composite strip.
  • the apparatus of Fig. 7 receives the master spools from the pre-spooler of Fig. 6.
  • Fig. 8 is a sectional view along the line 8-8 of Fig. 3.
  • a packet 110 that is representative of a large number of packets that are used for constructing a transformer core in accordance with the method of our invention.
  • the packet of Figs. 1 and 2 is formed from many superposed elongated strips 112 of amorphous steel, each having a thickness of only about 1 mil, which is very small in comparison to the 7 to 12 mils typical of the thickness of the grain-oriented silicon steel that is most commonly used for distribution transformer cores.
  • Each strip comprises two lateral edges 114 extending along its length and transversely-extending edges 116 at opposite ends of the strip.
  • the superposed strips are arranged in groups 120 each comprising a large number of strips, e.g., 10 to 36. In each group, the lateral edges 114 of the strips at each side of the strips are substantially aligned, and the transversely-extending edges 116 of the strips at each end of the strips are substantially aligned.
  • Packet 110 comprises a plurality of superposed groups 120 of strips.
  • the lateral edges (114) of all the groups are substantially aligned but the transversely-extending edges (116) of the groups at the ends of the packet are staggered with respect to each other longitudinally of the packet.
  • the ends of successive groups considered from the inside I to the outside O of the packet, overlap at one end of the packet and underlap at the opposite end of the packet.
  • All the packets used in a given transformer core are preferably of the same basic construction and the same width, but the packets (assembled for being successively wrapped about the window of the core) are made of progressively increasing length to accommodate the increasingly greater circumference of the core form as it is built up by the successive wrapping of packets about its outer periphery.
  • the packets 110 and their components are produced in a special manner that will be described in more detail hereinafter.
  • this belt nester For building up a core form from packets such as shown at 110 in Figs. 1 and 2, we utilize a type of wrapping machine commonly referred to as a belt nester.
  • this belt nester designated 128, comprises a rotatable arbor 130 that comprises a steel hub 131 having a circular outer periphery 132 and two guide flanges 134 and 136 removably attached to the hub at its respective opposite sides.
  • Each guide flange 134 and 136 extends radially outward beyond the circular outer periphery 132 of the hub so that there is a space 137 of U-shaped cross-section present at the outer periphery of the arbor.
  • each of the flanges 134 and 136 is made primarily of aluminum, but each flange includes a thin sheet 138 of wear-resistant stainless steel on its inner face adhesively bonded to the remainder of the flange.
  • a plurality of packets such as shown at 110 in Figs. 1 and 2 are successively wrapped about the hub 131 of the arbor in the space 137 between the flanges 134 and 136.
  • the flanges serve as guides cooperating with the lateral edges 114 of the packets to assure that the packets are tightly wrapped about the outer periphery 132 of the hub with their lateral edges 114 at each side of the packet in substantial alignment.
  • the wear-resistant coating 138 on each flange serves to protect the flange against wear or other damage from the sharp edges of the amorphous steel strips wrapped within space 137.
  • the belt nester 128 For successively wrapping the packets 110 about the hub 131 of the arbor 130, the belt nester 128 employs an endless flexible belt 140 that encircles the hub 131.
  • This belt extends from a first point 141 on the front of the arbor about a first front roller 142, then about three idler rollers 143, 14 4 and 14 5, then about rollers 146, 147 and 148 in a belt-tensioning device 150, then about three more idler rollers 151, 152 and 153, then about a motor-driven pulley 155, and then about a second front roller 156 to a second point 158 on the front of the arbor spaced from the first point 141, and then around the hub 131 of the arbor back to the first point 141.
  • rollers 142, 143, 144, 145, 147, 151, 152, 153 and 156 is suitable mounted for free rotation about its own stationarily-located central axis.
  • the motor-driven pulley 155 is coupled to an electric motor (not shown) through a rotatable drive shaft 157 attached to the pulley and having a stationary axis.
  • the pulley drives the belt 140 in the direction of arrows 160 ( Fig. 3 ).
  • the belt-tensioning device 150 comprises a pair of rollers 146 and 148 that are mounted on a horizontally-extending cross-head 162 that is suitably guided for vertical motion and biased vertically upward by a spring device 164. Also included within the belt-tensioning device is a stationary idler roller 147.
  • the belt 140 extends from the idler roller 145 over one of the movable rollers 146, then underneath the idler roller 147, then over the other movable roller 148 and then underneath idler roller 152.
  • the movable rollers 146 and 148 move downwardly against the bias of spring device 164 to make available this greater effective belt length.
  • the spring device 164 maintains a substantially constant tension on the belt 140 as the core form is built up on the arbor.
  • Each packet 110 that is to be wrapped about the arbor is fed onto the arbor hub along the upper surface of a stationary guide plate 165 that extends between theof front rollers 142 and 156.
  • This guide plate has a front portion 167 that is curved gradually upwardly so that the leading end of the packet entering from the right is directed upwardly into the space between the upper run of the belt 140 and the underlying peripheral portion of the hub of the arbor.
  • the belt moves in a counterclockwise direction about the axis 166 of the arbor, it drives the arbor counterclockwise about this axis, carrying the leading end of the packet counterclockwise about the axis 166.
  • the leading end of the packet moves in this manner, more and more of the remaining length of the packet enters the space between the belt and the hub and is progressively wrapped about the hub. This action continues until the trailing end of the packet is wrapped.
  • the packet is of such length that its trailing end overlaps its leading end, thereby producing a lap joint between opposite ends of each group in the packet.
  • the leading edge of each group that is laid down after the first (or radially-innermost) group is positioned closely adjacent the trailing edge of the immediately-preceding group. Accordingly, there are formed between the ends of each packet distributed lap joints, sometimes referred to also as step lap joints.
  • Fig. 3 depicts the belt nester after its arbor 132 has been rotated through almost a single revolution to almost complete wrapping of a first packet 110 about the arbor hub.
  • a second packet is depicted at 110a in a position where it is in readiness to be fed into the belt nester to be wrapped about the first packet after wrapping of the first packet is completed.
  • the arbor must be rotated slightly more than one revolution (i.e., a short distance into a second revolution) in order to produce the desired overlap at the packet joint.
  • this second revolution of the arbor is completed, and then a new packet (e.g., 110a of Fig.3) is fed into the belt nester in the same manner as described above and is wrapped about the outer periphery of the immediately-preceding wrapped packet in the same manner as described above.
  • Additional packets are successively wrapped about the outer periphery of the core form in the same manner until a core form of the desired thickness, or build, has been developed.
  • the additional packets that are wrapped after the first two are so positioned that their lap joints are located generally in radial alignment with the lap joints of the first two packets.
  • the joint region of the full-thickness core has a progressively increasing length proceeding from the window to the outer periphery of the core form, just as shown in Fig. 2 of the aforesaid U.S. Patent 4,741,096-Lee and Ballard.
  • one of the flanges (134) on the arbor has a gap or window 135 therein angularly registering with the joint region, and through this window the operator of the belt nester 128 can readily view the joint developed for each packet. If the amount of overlap in the joint is not within prescribed limits, he initiates certain adjustments in the strip-length control means (soon to be described) which cause the strip-length control means to appropriately adjust the length of subsequently-cut strips and thus the groups and packets assembled from such strips.
  • the axis 166 of the arbor is forced to move to the left, as viewed in Fig. 3, thus providing room for new packets successively fed onto the outer periphery of the core form between this outer periphery and the front roller 142.
  • This leftward movement of the arbor axis is made possible by horizontally-extending slots 168 provided in the framework 170 that supports the arbor.
  • the arbor has a horizontally-extending supporting shaft 172 that extends into these slots, and the slots cooperate with this shaft 172 to guide the arbor for the desired horizontal movement.
  • the arbor is biased to the right by the belt-tensioning device 150 supplying tensioning force to the belt 140.
  • the arbor hub 131 is forced away from the front rollers 142 and 156, thus gradually moving horizontally to the left against the rightward bias of the belt-tension.
  • Rightward movement of the arbor by the above-described biasing force is limited by the front rollers 142 and 156, which contact the belt 140 encircling the core form.
  • Our invention enables us to effectively belt-nest groups of amorphous steel strips on a rotating arbor without relying upon any perchloroethylene or similar liquid for holding the strips together while they are being wrapped.
  • An important step in enabling us to achieve this objective is that we feed the groups of strips into the belt nester in packets instead of in individual groups.
  • Each packet has enough column strength considered laterally of the packet to enable the guide flanges 134 and 136 of the rotating arbor to edge-guide the packet laterally, acting upon the lateral edges of the packet to force the packet to seat squarely within the U-shaped space 127 at the periphery of the arbor with its lateral edges at each side of the packet in alignment with those of the already-seated packets.
  • the infeed rollers 180 by bearing against the top of the packet edge-portions(and thus exerting force on these portions acting radially inwardly of the arbor hub), block those edge-portions from rolling up the flanges and thus maintain a cylindrical configuration of the core form as it is built up.
  • the spacing (at 189, Fig. 5) between the infeed rollers 180 and their associated flanges 134 and 136 is made quite small in the range of about 0.025 to 0.125 cm (.01 to .05 inches).
  • the belt 140 of the belt-nester has a width that extends for only a small portion of the width the amorphous sheets and does not extend out to the infeed rollers 180.
  • the exposed periphery of thse rollers is available to bear against the edge portions of the amorphous packet to block these edge portions from climbing up the flanges 134 and 136.
  • the shaft 182 that carries the infeed rollers 180 and the upper front roller 142 is mounted within axially spaced apart bearings, schematically shown at 186 and 188. These bearings are fixed to the frame 170 by suitably mounting structures (not shown).
  • Figs. 6 and 7 which figures are substantially identical to Figs. 1 and 2 of the aforesaid Application S.N. 505,593-Ballard and Klappert (GB-A-9100509.0).
  • a pre-spooler 10 which is adapted to receive five starting spools 12,14, 16, 18, and 20 of amorphous steel strip. These starting spools are spools received from the steel mill, and, accordingly, in each starting spool the strip is of single-layer-thickness.
  • the basic purpose of the pre-spooler is to combine the single-layer thickness strips from the starting spools 12, 14, 16, 18, and 20 into multiple-layer thickness strip which is wound onto a master reel 24 as a master spool 25.
  • Each starting spool is mounted on a fixed-axis rotatable spindle 26 which is coupled to the rotor of an adjustable speed electric motor 27, which motor, when energized drives the spindle 26 in a counterclockwise direction (as indicated by arrow x) to effect unwinding of the associated starting spool.
  • the master reel 24 is mounted on a fixed-axis rotatable spindle 28, which is also coupled to the rotor of an electric motor (23), which normally operates at a substantially constant speed.
  • the latter motor when energized, drives the spindle 28 in a clockwise direction (as indicated by arrow y) to wind the multiple-layer thickness strip onto the master reel 24.
  • the single-layer thickness strip unwound from each starting spool is directedover a series of guide rollers onto the master reel 24. These single-layer thickness strips are designated 29a, 29b, 29c, 29d, and 29e.
  • the guide rollers for the strip from the first starting spool 24 are designated 30, 31, and 32.
  • the guide rollers for the strip from the second starting spool are designated 34, 35, and 36.
  • Corresponding guide rollers are present for the strip unwound from each starting spool.
  • the single-layer thickness strips from the five starting spools are combined into a multiple-layer thickness strip at the periphery of the master spool 25, and this multiple-layer thickness strip is wound onto the master spool 25 as the spindle 28 of the master reel is driven in a clockwise direction.
  • each tensioner roller 40 is provided adjacent each starting spool, acting on a downwardly extending loop 41 in the associated strip located between two of the guide rollers for the strip.
  • Each of these tensioner rollers 40 is mounted in a conventional manner for vertical motion, being gravity biased in a downward direction by a suitable weight. This gravity bias, acting on the strip through roller 40, keeps the strip taut, thus assuring that the multiple-layer thickness strip is smoothly and tightly wound onto the master reel 24.
  • each tensioner roller 40 is biased downwardly with a weight of about 0,68 Kg (1.5 pounds) for each 2.5 cm (1 inch) of strip width.
  • a suitable control 31 is provided for each starting-spool electric motor 27.
  • This control 31 which is of a conventional form, operates off a dancer arm, schematically indicated at 33, that moves up and down with the tensioner roller 40.
  • the control 31 causes its associated motor 27 to operate at a speed which depends upon the vertical position of the tensioner roller 40.
  • the starting spool e.g., 12
  • the master spool 25 increases in diameter through winding
  • Control 31 responds to this rise in the position of the tensioner roller 40 by causing the motor 27 to increase its speed, thereby making available more unwound strip material and causing the tensioner roller to descend to its normal vertical position shown. If the tensioner roller descends beyond its normal vertical position shown, the control 31 will cause the motor 27 to reduce its speed, thus shortening loop 41 and returning the tensioner roller 40 to its normal vertical position shown.
  • the tensioner roller 40 and control 31 cooperate (i) to maintain substantial tension on each of the single-layer thickness strips as it is being wound onto the master spool 25 and (ii) to effect unwinding of the starting spools at appropriate speeds without requiring all the unwinding forces to be transmitted through the single-layer thickness strip.
  • the master spool 25 of the desired build When a master spool 25 of the desired build has been wound on reel 24, the master spool is removed from the drive spindle 26 and put aside for subsequent use. To make possible removal of the master spool, the single-layer thickness strips 29a-e are suitably cut at a location adjacent the master spool just prior to removal.
  • each of the multilayer strips 53 in each of the master spools 25 is five layers in thickness, and, accordingly, the composite strip 55 is 4x5, or 20, layers in thickness.
  • each of the strips 53 of Fig. 2 passes through a pit 76 common to and beneath all the master spools 25 and then over a guide roll 74, where the orientation of each strip is changed from generally vertical to generally horizontal. After passing over the guide rolls 74, the strips are directed in gradually converging relationship into the composite strip 55. The portion of each multiple-layer thickness strip 53 between its associated master spool and its quide roll 74 hangs downwardly in a loop that is located in the pit 76.
  • the weight of the strip 53 in this loop 75 exerts tensile forces on the associated strip 53 as it enters the composite strip 55, thus keeping the strip 53 taut just upstream from the location where it is combined with the other strips, thus reducing the chances for wrinkles and other irregularities in the composite strip.
  • the composite strip 55 is advanced to the right in Fig. 7 by strip-feeding means 57 comprising a pair of clamping elements 58 and 60. These clamping elements are movable toward and away from each other and are also movable in unison horizontally. In Fig. 7, the clamping elements are shown in their extreme left-hand location and in their minimum spacing position clamping the composite strip 55 on its upper and lower faces. When the clamping elements 58 and 60 move to the right from their position of Fig. 7, they advance the composite strip to the right between the spaced-apart blades 62 and 64 of a shearing device 65.
  • Assisting the strip-feeding means 57 is additional strip-feeding means 70 located downstream from the blades 62 and 64.
  • this downstream strip-feeding means 70 becomes effective, the clamping elements 58 and 60 of the first strip-feeding means 57 are separated from each other to release the composite strip 55 and are reset by movement in unison to the left back toward their initial position of Fig. 7.
  • the strip-feeding means 70 has properly positioned the composite strip by further movement to the right, it also unclamps the composite strip and returns to the left to its initial position of Fig 7.
  • each of the payoff reels 50 is coupled to the rotor of an electric motor 80.
  • the motor rotates its associated payoff reel in a counterclockwise direction, making unwound strip material available for the composite strip 55.
  • the strip unwound from each master spool hangs down into a loop 75.
  • Each of the individual strips forming the multiple-layer strip hangs down in its own loop, and the vertical spacing between these loops becomes increasingly larger as the associated master spool unwinds.
  • a photoelectric control 81 for each multiple-layer strip 53 is located within, or adjacent, the pit 76 and operates off the lowermost loop 75 of each multiple-layer strip 53 (i) to cause the motor 80 associated with that strip 53 to start and unwind the strip at gradually increasing speed if the loop rises above a predetermined upper limit and (ii) to cause the motor to decelerate to a stop if the loop falls below a predetermined lower limit.
  • the two strip-feeding means 57 and 70 in moving to the right, cause the composite strip 55 to be intermittently advanced to the right; and this causes the horizontal portions of the multi-layer strips 53 to be advanced intermittently to the right.
  • the master spools 25 are unwound by their respective motors 80, making available strip material in the loops 75. From these loops the multi-layer strip material 53 is pulled by feed means 57 and 70 and combined into the composite strip 55. During these operations, the horizontal portion of each of the multi-layer strips 53 is maintained under tension by the weight of the loops 75 in the pit 76.
  • shear blades 62 and 64 are preferably constructed as shown and claimed in Patent Application S.N. 334,248 - Taub et al., filed on April 6, 1989, and assigned to the assignee of the present invention (EP-A-0391194 - 90105703.4).
  • the shear blades cut the composite strip 55 into sections of composite strip having the desired lengths. These sections constitute the groups 120 of Figs. 1 and 2 described hereinabove.
  • the groups 120 are suitably stacked up to form a packet such as the packet 110 of Figs. 1 and 2.
  • One automated method for forming a packet from such groups is disclosed in the U.S. Application S.N. 463,697 - Ballard and Klappert, filed January 11, 1990 (GB-A-9100559.5).
  • Each packet, made up and assembled as described above, is suitably transferred to a position atop the upper run of a conveyor belt 200 (Fig. 3).
  • This conveyor belt 200 extends about two spaced-apart pulleys 202 and 204, each rotatable about a fixed axis.
  • Pulley 202 is a driving pulley coupled to the rotor of a suitably controlled electric motor (not shown), and the other pulley 204 is an idler pulley.
  • stationary guides 207 and 208 are provided at opposite sides of the desired lateral position of the packet. Referring to Fig. 8, these guides are mounted on a stationary frame 209 positioned beneath the upper run of the belt.
  • the guiding, or inner, surfaces of the guides 207 are located in substantially the same plane as the inner surface of the nesting flange 134; and the guiding surfaces of guide 208 are located in substantially the same plane as the inner surface of nesting flange 136.
  • the guides 207 and 208 are suitably adjustably mounted on the stationary frame 209 so as to render the conveyor capable of accommodating strips of different width when it is desired to construct transformer core forms of different width from that of the core form illustrated.
  • a different arbor 130 having an appropriately adjusted spacing between its nesting flanges would also be employed.
  • each section, or group, 120 cut from the composite strip 55 must be controlled so that the ends of the group overlap by the proper amount when the group is wrapped about the arbor.
  • This length is controlled by controlling the distance that the composite strip 55 is advanced beyond the blades 62, 64 before a cutting operation is effected by the blades.
  • This advancing of the composite strip is performed by strip-feeding means 70 (Fig. 7), which includes suitable means (not shown) for controlling its stroke.
  • an error signal is supplied to the control for the strip-advancing means 70 to cause it to appropriately adjust the stroke of the strip-advancing means and thus the length of the next sections of strip to be cut.
  • These viewing and stroke-adjusting operations can be done either by a human operator or by suitable electro-optical control means (not shown). Viewing of the joint takes place through the window 135 in flange 134.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
EP19910305192 1990-06-11 1991-06-10 Method of making a transformer core Expired - Lifetime EP0461829B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US53553890A 1990-06-11 1990-06-11
US535538 1990-06-11

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EP0461829A1 EP0461829A1 (en) 1991-12-18
EP0461829B1 true EP0461829B1 (en) 1995-02-22

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EP (1) EP0461829B1 (ja)
JP (1) JPH069180B2 (ja)
CA (1) CA2042253C (ja)
DE (1) DE69107518T2 (ja)

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Publication number Priority date Publication date Assignee Title
US5191700A (en) * 1990-12-12 1993-03-09 General Electric Company Method for making packets of amorphous metal strip for transformer-core manufacture
US5063654A (en) * 1990-12-12 1991-11-12 General Electric Company Method for making packets of amorphous metal strip for transformer-core manufacture
US5347706A (en) * 1992-06-26 1994-09-20 General Electric Company Method for making packets of amorphous steel strip for transformer core manufacture
US5321883A (en) * 1992-10-20 1994-06-21 General Electric Company Apparatus for making a transformer core comprising strips of amorphous stell wrapped around the core window
WO1994029889A1 (en) * 1993-06-15 1994-12-22 Alliedsignal Inc. A machine for making sets of magnetic ribbons for use in distribution transformer cores
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EP0461829A1 (en) 1991-12-18
CA2042253C (en) 2000-08-15
CA2042253A1 (en) 1991-12-12
JPH069180B2 (ja) 1994-02-02
DE69107518T2 (de) 1995-11-09
JPH04241408A (ja) 1992-08-28
DE69107518D1 (de) 1995-03-30

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