US3697912A - Welding transformers - Google Patents

Welding transformers Download PDF

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Publication number
US3697912A
US3697912A US870364A US3697912DA US3697912A US 3697912 A US3697912 A US 3697912A US 870364 A US870364 A US 870364A US 3697912D A US3697912D A US 3697912DA US 3697912 A US3697912 A US 3697912A
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United States
Prior art keywords
shunt member
primary
core
legs
coils
Prior art date
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Expired - Lifetime
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US870364A
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English (en)
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Arne Solli
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Individual
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/263—Fastening parts of the core together
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/08—Variable transformers or inductances not covered by group H01F21/00 with core, coil, winding, or shield movable to offset variation of voltage or phase shift, e.g. induction regulators
    • H01F29/10—Variable transformers or inductances not covered by group H01F21/00 with core, coil, winding, or shield movable to offset variation of voltage or phase shift, e.g. induction regulators having movable part of magnetic circuit

Definitions

  • Boesen [5 7] ABSTRACT The present invention relates to a welding transformer, of the kind in which each of the coils of the primary and secondary circuits is divided into two parts extending parallel to a magnetic shunt member and so arranged on the two transformer legs that the two coil parts of the primary coil are located on the one side of the shunt member and the two coil parts of the secondary coil on the other side, and wherein the amperage is controlled by means of the substantially M-shaped shunt member, which is displaceably arranged between the primary circuit and the secondary circuit.
  • a welding transformer of the kind described being characterized in that the ratio of the width of the center leg of the magnetic shunt member to that of the outer legs of the same is approximately as l to l, and that the length of the window of the transformer core in the longitudinal direction of the shunt member to the width of the legs of the core is approximately as 2 to 1, so that the center leg of the magnetic shunt member, together with the primary and secondary coil parts fill out the window of the core, while the outer leg and yoke of the shunt member fill out the remaining outer space between the primary and secondary coil parts when the shunt member is in its inserted position.
  • the legs of the M-shaped shunt member are so shaped at their end portions that substantially all points of said end surfaces simultaneously pass the outer limits of said intermediate space.
  • the end surfaces of the shunt member legs are shaped to correspond to the outer circumference of the coils. This is achieved by removing the inner corners of the outer legsof the M-shaped shunt member and also both corners of the center leg, whereby the shunt member obtains concave surfaces substantially corresponding to the outer circumference of the coils.
  • the large area of the shunt member allows a correspondingly lesser width (approximately one-third of that of conventional welding transformers) so that the primary and secondary coils approach each other to a very high degree, and a substantially higher maximum welding current is obtained.
  • some of the shunt member plates are narrower than the other plates, thus forming grooves in the center leg of the shunt member, said grooves engaging guide members provided on the inner sides of the transformer core.
  • Those plates forming the side walls of said grooves are bent inwards towards each other, so that they rest resiliently against said guide members. Movement of the shunt member is obtained by means of a spindle cooperating with a nut mounted on the side surface of the shunt member. This method of guiding the shunt member requires very little space and it is therefore not necessary to remove too much of the plate material of the shunt member in order to procure space for the guide arms.
  • Said guide arms are fastened to the transformer core and engage grooves provided in the shunt member. Said guide arms are fastened to the core by means of a clamp device, which simultaneously serves to compress the plates of the transformer core.
  • the guide arm is formed with a step with a pin cooperating with one end of a clamping piece, to the other end of which a bolt is fixedly or detachably mounted, said bolt being inserted into another clamping piece on the other side of the transformer core.
  • the outer ends of the guide arms are supported relative to each other by means of a yoke, on which a rotatable spindle is provided, said spindle cooperating with a nut member on the shunt member.
  • a yoke on which a rotatable spindle is provided, said spindle cooperating with a nut member on the shunt member.
  • FIG. 1 shows the transformer in side elevation, illustrating the magnetic shunt member, the coils and guiding devices.
  • FIG. 2 shows the transformer in plan view.
  • FIG. 3 is a perspective view of a guiding provided in the transformer core cooperating with a groove provided in the magnetic shunt member.
  • FIG. 4 is an exploded perspective view of the clamping device.
  • the welding transformer comprises a rectangular core 1 having divided primary and secondary coils 2 and 3, an intermediate M-shaped magnetic shunt member 4, the center leg of which, together with the coils 2 and 3, fill out the transformer core window.
  • the magnetic shunt member occupies its inner (lower) position, its outer leg and yoke will fill out a substantial part of the air space between the coils 2,3 of the primary and secondary circuits.
  • the coils 2,2 and 3,3 will be wound in such a manner that approximately full (total) utilization of the available area of the window of the transformer is achieved (excepting the space occupied by the shunt member). Thereby, a certain ratio is established between the width of the center leg and that of the outer leg, said ratio being approximately 2:1.
  • the end surfaces 18, 19,20 of the M-shaped shunt member 4 are shaped in accordance with FIG. 1, so that when the shunt member 4 is moved out of the intermediate space of the primary and secondary coils 2 and 3, substantially all points of said end surfaces will pass the outer limit of said coils simultaneously. The shunt member 4 will thereby leave the magnetic fields of the coils, whereby a maximum amperage is more rapidly obtained.
  • FIGS. 1 and 4 illustrate a guiding device between the core 1 and the magnetic shunt member 4, said device comprising clamping means compressing the plates of the core.
  • the clamp device comprises a first clamping piece 25 and a second clamping piece 26,both having a U- shaped section and adapted to compress the plates of the core 1 by means of bolts 8 and 9.
  • One (8) of said bolts 8,9 is fixedly (rigidly) connected with the clamping piece 26 and the other detachably connected with the clamping piece 26 by means of a pin 11 projecting from a step adapted to engage a hole 12 in the clamping piece 26.
  • a guide arm 13 is at its free end supported relative to another guide arm 13 by means of a yoke 15.
  • On said yoke 15 a rotatable spindle 16 is provided, said spindle engaging a nut member 17 provided on the side surface of the shunt member 4. By turning the spindle 16 the shunt member 4 is moved into or out of the intermediate space between the primary and secondary coils.
  • the flanges of the clamping pieces 25, 26 serve as distance pieces for the coil parts 2,3.
  • transformers of the kind described become smaller in size and weight than ordinary welding transformers possessing the same maximum amperage. According to the invention a lower amperage is obtainable as compared with conventional transformers of this kind.
  • welding transformer in which the coils (2,3) of the primary and the secondary circuits each is divided into two parts extending parallel to a magnetic shunt member (4) and so arranged on the two transformer legs that the two coil parts (2,2) of the primary coil are located on the one side of the shunt member (4) and the two coil parts (3,3) of the secondary coil on the other side, and wherein the amperage is controlled by means of the substantially M-shaped shunt member (4), which is displaceably arranged between the primary circuit and the secondary circuit, characterized in that the ratio of the width of the center leg of the magnetic shunt member (4) to that of the outer leg of the same is approximately as 2 to l, and that the ratio of the widths of the outer legs is approximately as l to l, and that the ratio of the length of the window of the transformer core (1) in the longitudinal direction of the shunt member to width of the legs of the core is approximately as 2 to 1, so that the center leg of the magnetic shunt member, together with the primary and secondary coil parts (2
  • welding transformer according to claim 1 characterized in that the legs of the M-shaped shunt member (4) at their end portions are so shaped in relation to the circumference of the primary and secondary coils (2,3) that substantially all points of the end surfaces (18, 19,20) of said legs, when the shunt member is moved out of or into the intermediate space of said coils, approximately simultaneously pass the outer limits of said intermediate space.
  • grooves (5) are formed in the side surfaces of the center leg of the magnetic shunt member 4 said rooves S bein formed b selectin m aller wi th of S0lT l6 of the %hunt memb er plates tfiar i for the remaining plates, and that these grooves (5) correspond to or cooperate with guide members (6) provided on the inner side surfaces of the transformer legs, and that the plates forming the side walls (7) of the groove (5) are bent inwards towards each other, in order to rest resiliently against the guide members (6).
  • a guide device for the'shunt member (4) comprises guide grooves provided on the shunt member (4) and guide arms (13) provided on the core (1), said guide arms (13) forming a part of a clamp device for compression of the core plates.
  • clamp device comprises a first clamping piece (25) having holes for insertion of bolts (8,9) fixedly or detachably mounted on a second clamping piece (26), one (9) of said bolts (8,9) being extended beyond said second clamping piece (26), said bolt extension forming said guide arm (13).
  • clamping transformer according to claim 5 characterized in that the clamping pieces (25,26) have outwardly projecting flanges, acting as distance pieces for the coils (2,3).

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Transformers For Measuring Instruments (AREA)
US870364A 1968-12-24 1969-09-12 Welding transformers Expired - Lifetime US3697912A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19681817670 DE1817670A1 (de) 1968-12-24 1968-12-24 Schweisstransformator
GB44494/69A GB1282489A (en) 1968-12-24 1969-09-09 Welding transformer
US87036469A 1969-09-12 1969-09-12

Publications (1)

Publication Number Publication Date
US3697912A true US3697912A (en) 1972-10-10

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US870364A Expired - Lifetime US3697912A (en) 1968-12-24 1969-09-12 Welding transformers

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US (1) US3697912A (de)
DE (1) DE1817670A1 (de)
GB (1) GB1282489A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4107635A (en) * 1976-12-06 1978-08-15 Emerson Electric Co. Arc welding machine
US6414267B1 (en) * 2001-06-25 2002-07-02 Illinois Tool Works Inc. Method and apparatus for control of a welding power source
US20150270052A1 (en) * 2014-03-20 2015-09-24 Panasonic Intellectual Property Management Co., Ltd. Coil structure and power converter
CN109326415A (zh) * 2018-12-05 2019-02-12 国网河南省电力公司禹州市供电公司 一种变压器防盗装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103545092A (zh) * 2013-10-28 2014-01-29 温岭万顺机电制造有限公司 一种新型焊机变压器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2450732A (en) * 1942-09-17 1948-10-05 Hartford Nat Bank & Trust Co Movable magnetic shunt transformer
US2567617A (en) * 1945-01-30 1951-09-11 Pedersen Birger Thorleif Transformer with regulable output current
US2671196A (en) * 1948-06-24 1954-03-02 Frederick C Owen Welding transformer
US3254318A (en) * 1962-10-16 1966-05-31 Westinghouse Electric Corp Welding apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2450732A (en) * 1942-09-17 1948-10-05 Hartford Nat Bank & Trust Co Movable magnetic shunt transformer
US2567617A (en) * 1945-01-30 1951-09-11 Pedersen Birger Thorleif Transformer with regulable output current
US2671196A (en) * 1948-06-24 1954-03-02 Frederick C Owen Welding transformer
US3254318A (en) * 1962-10-16 1966-05-31 Westinghouse Electric Corp Welding apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4107635A (en) * 1976-12-06 1978-08-15 Emerson Electric Co. Arc welding machine
US6414267B1 (en) * 2001-06-25 2002-07-02 Illinois Tool Works Inc. Method and apparatus for control of a welding power source
US20150270052A1 (en) * 2014-03-20 2015-09-24 Panasonic Intellectual Property Management Co., Ltd. Coil structure and power converter
US9660546B2 (en) * 2014-03-20 2017-05-23 Panasonic Intellectual Property Management Co., Ltd. Coil structure and power converter
CN109326415A (zh) * 2018-12-05 2019-02-12 国网河南省电力公司禹州市供电公司 一种变压器防盗装置
CN109326415B (zh) * 2018-12-05 2024-03-12 国网河南省电力公司禹州市供电公司 一种变压器防盗装置

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Publication number Publication date
GB1282489A (en) 1972-07-19
DE1817670A1 (de) 1970-07-09

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