EP0294297A1 - Elektrischer Transformator für Mikrowellenherde - Google Patents

Elektrischer Transformator für Mikrowellenherde Download PDF

Info

Publication number
EP0294297A1
EP0294297A1 EP88420153A EP88420153A EP0294297A1 EP 0294297 A1 EP0294297 A1 EP 0294297A1 EP 88420153 A EP88420153 A EP 88420153A EP 88420153 A EP88420153 A EP 88420153A EP 0294297 A1 EP0294297 A1 EP 0294297A1
Authority
EP
European Patent Office
Prior art keywords
winding
magnetic circuit
electrical
carcass
primary
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP88420153A
Other languages
English (en)
French (fr)
Inventor
Bernard Chappel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Optelec SA
Original Assignee
Societe pour lApplication de lOptique et de lElectronique a la Recherche et a lAutomatisation SA OPTELEC
Optelec SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Societe pour lApplication de lOptique et de lElectronique a la Recherche et a lAutomatisation SA OPTELEC, Optelec SA filed Critical Societe pour lApplication de lOptique et de lElectronique a la Recherche et a lAutomatisation SA OPTELEC
Publication of EP0294297A1 publication Critical patent/EP0294297A1/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • H01F27/325—Coil bobbins

Definitions

  • the present invention relates to electrical transformers intended for supplying electrical energy to the power circuits of microwave ovens.
  • These transformers comprise a primary electrical winding, in the form of a coil, the two ends of the winding wire being electrically connected to lugs intended to be connected to the electrical supply network.
  • a secondary high-voltage electrical winding consists of an electrical conductor wound in the form of a coil, the first end of which is electrically connected to the magnetic circuit of the transformer and to the earth of the microwave oven, and the other end of which is electrically connected to a high voltage output terminal intended to be connected to the high voltage electrical components of the microwave oven for their electrical supply.
  • the transformer further comprises a secondary electric heating coil, formed of a coil-wound conductor, with a small number of turns, the two ends of the heating conductor being provided with lugs for the connection of the electric heating filament circuit.
  • the transformer magnetic circuit includes two lateral columns and a central column, all three connected by end crosspieces. An intermediate magnetic shunt partially loops the magnetic circuit between the lateral columns and the central column, deflects part of the magnetic flux between the primary electrical winding and the secondary high-voltage electrical winding.
  • the powers usually delivered by such a type of transformer are between 200 and 1500 Watts, so that they are low power transformers.
  • the primary supply voltage is generally between 110 and 240 Volts.
  • the high-voltage output voltage is generally about 2,300 volts, and must have a particular waveform conferred on it by the magnetic circuit provided with a particular magnetic shunt.
  • German utility model DE-U-8 633 338 describes a transformer for a microwave oven in which the electrical windings are produced on carcasses of insulating material. Such a technique is not sufficient to achieve complete isolation of the electrical circuit from the magnetic circuit, and requires providing additional wrapping of the electrical circuit on the carcasses. It is further noted that the magnetic circuit described in this document has a complex shape, with cutouts which reduce the section of the magnetic circuit in certain zones and disturb the circulation of the magnetic flux.
  • the object of the present invention is in particular to avoid the drawbacks of known insulation techniques, by ensuring the insulation of electrical circuits by means of rigid carcases and covers made of molded insulating material, of particular shapes specially adapted for an application to a microwave oven transformer, and providing increased electrical insulation between the electrical circuits themselves and between the electrical circuits and the magnetic circuit.
  • Such an insulation structure according to the invention also allows automatic mounting, by producing robust and manipulable subassemblies which can themselves be produced automatically and which can be assembled together automatically.
  • this structure makes it possible to reduce the number of parts to be assembled, the number of parts to be stored.
  • the structure improves the mechanical protection of the windings, and also facilitates handling by avoiding, during this handling, the partial deterioration of the windings. and the production of insulation faults. Reliability is thus considerably increased.
  • the main difficulty when attempting to insulate a transformer for a microwave oven using carcasses and rigid molded covers is that such an isolation technique leads to a significant increase in the volume of the transformer.
  • the carcass and hood walls must indeed have a sufficient thickness to hold the required insulation voltage, and these walls occupy a non-negligible volume which becomes all the more important in proportion when the transformer is designed to provide relatively power low.
  • this insulation technique using carcasses and covers is a priori inapplicable to transformers of low power microwave ovens.
  • the invention solves this problem by making it possible to reduce the total volume of electrical circuits and their insulation, by a particular arrangement of the windings in a partially superimposed manner.
  • a second problem posed by known transformer structures for microwave ovens is the fact that the magnetic shunts, positioned between the primary coil and the secondary coil to provide the current limiting function necessary for the production of a transformer most often have an ill-defined position, and their electrical isolation is difficult to achieve.
  • Another object of the present invention is therefore to provide means making it possible to precisely position the magnetic shunts, by ensuring the repetitive production of an air gap whose dimension is well defined, so as to ensure the repeatability of the calibration of the transformer in production series.
  • the positioning of the magnetic shunts is ensured by the carcases and the covers, which simultaneously provide 10 kV dielectric isolation between the windings and the magnetic shunts as well as the creepage distances required by the safety standards of the different countries, by positioning on the central leg of the magnetic circuit and no longer randomly.
  • the structure according to the invention allows automatic or semi-automatic assembly and mounting of the shunts and coils in the magnetic circuit.
  • the shunts are earthed by contact on the inner part of the outer magnetic circuit leg, or by an electrical ground connection between the shunts and the magnetic circuit. In all cases, the sheet metal plates forming the shunts are immobilized in all planes, and their vibration and the appearance of noise are avoided.
  • a third problem presented by known microwave oven structures is the size of the electrical connections of the transformer.
  • the terminals or winding outputs of the low-voltage transformers are located on the rigid carcasses or on insulators in folded sheets and arranged to receive the terminals.
  • the arrangement of the transformers in increasingly compact microwave enclosures requires placing the terminals on the visible external face of the coils, that is to say on the peripheral face part of the windings which is not covered by the circuit. magnetic.
  • the terminal can then no longer be disposed on the carcass, and must be maintained by makeshift means such as parts attached to the periphery of the windings, with the interposition of insulators, the parts holding the terminals being held on the windings by adhesive tapes or other means of wrapping.
  • the present invention therefore aims to avoid the drawbacks of known connection means, by proposing to have the electrical output lugs on the isolation covers covering the carcasses.
  • a first advantage of this structure is that the lugs placed on the covers are kept away from the windings, without direct contact with the electrical insulation means of the windings.
  • the covers provide additional thermal insulation between the lugs and the windings, so that the lugs can be welded without risk of damaging the insulation of the windings.
  • the fact that the lugs are held by rigid covers further facilitates their precise positioning, and makes it possible to have automatic or semi-automatic mounting of the terminal on the cover.
  • the positioning accuracy of the terminal and the fact that it is very well isolated from the windings makes it possible to weld the output terminal connection by means of an automatic tin bath machine.
  • the positioning accuracy of the terminals also facilitates automatic control of the coils and transformers at the output of assembly lines.
  • This arrangement also allows a very high resistance to tearing, without risk of deterioration and without additional cost, even when the standards to be met are very strict in terms of tearing tests, because the terminal is properly and rigidly implanted in the hood.
  • the production cost of the transformers is also significantly reduced, since the cutting and folding operations of a large number of insulating elements are avoided, eliminating all the adhesive tapes which are necessary in known technologies.
  • the invention further provides means facilitating the temporary fixing of the winding wires at the end of the execution of the coils, these means being constituted by lugs provided on the carcasses, and on which the output wire is temporarily twisted.
  • the wire thus temporarily attached at the end of winding allows the controls and handling of chains without damage.
  • the transformer includes: - a primary carcass of insulating material, comprising a central mandrel for the passage of the central column of the magnetic circuit, an external flange and an internal flange, - a secondary carcass of insulating material, comprising a central mandrel for the passage of the central column of the magnetic circuit, an external flange and an internal flange, - two primary insulating covers, each comprising three walls covering respectively the outer and inner flanges and the electrical winding in the areas facing the magnetic circuit, - two secondary insulating covers, each comprising three walls respectively covering the external and internal flanges and the electrical winding in the areas facing the magnetic circuit, - An external annular housing, formed on one of the primary or secondary carcass flanges, to contain the secondary electric heating coil, thus ensuring its electrical isolation and its mechanical maintenance.
  • the external annular housing - is limited towards the center by an axial mechanical retaining rim, - has an axial depth only slightly greater than the diameter of the heating winding wire, - is closed, on the parts of its periphery surrounded by the magnetic circuit, by the corresponding insulating covers covering the carcass, which thus provide electrical insulation between the magnetic circuit and the heating coil.
  • the external annular housing occupies the flange part closest to the winding axis, the most distant part being formed by a shoulder defining an axial cylindrical wall which radially limits the annular housing and that is connected to an axially offset radial wall.
  • the main carcase winding externally covers the secondary heating winding. The winding of the main winding is facilitated.
  • the main carcass winding and the secondary heating winding are partial ment superimposed, and we see that this arrangement allows to significantly reduce the overall volume occupied by the windings.
  • the interior walls of one of the primary or secondary cover pairs comprise external housings limited by two lateral edges in the outer limit planes of the magnetic circuit and at least one transverse edge; the housings are intended to contain and isolate a stack of sheets forming magnetic shunts, the sheets then being separated from the magnetic circuit by an air gap defined by the transverse housing edge.
  • the housings are provided on the covers of the secondary circuit.
  • one of the secondary covers carries, in its zone not surrounded by magnetic circuit, an electrical connection terminal to which the first end of the winding wire is connected high voltage secondary; similarly, the primary carcass cowls include, in their area not surrounded by magnetic circuit, primary winding connection lugs.
  • the transformer comprises a magnetic circuit 1 with two lateral columns 2 and 3 and a central column 4, the columns being connected by a first end cross-member 5 and a second end cross-member 6.
  • the columns 2, 3 and 4 and the cross-member 5 are produced by a stack of sheets cut out in the shape of an E, and the cross-piece 6 is formed by a stack of rectangular sheets attached to the end of the branches of the cross-section, to which they are joined for example by welding.
  • the particular structure of the electrical windings and the isolation means according to the present invention makes it possible to use magnetic circuits of totally traditional form, in which the columns 2, 3, and 4 and the crosspieces 5 and 6 have constant widths suitable for drive the magnetic flux.
  • the electrical windings of the transformer are arranged around the central column 4 of the magnetic circuit, and include a primary electrical winding 7 in the form of a coil.
  • the primary winding ends on the two primary winding lugs 8 and 9 shown in Figure 3, or on two lugs 80 and 90 shown in Figure 6.
  • a high voltage secondary winding 10, also in the form of a coil, is ends on the two high-voltage output terminals 11 and 12, and a secondary heating winding 13 formed of a few turns of electrical conductor ends in two heating terminals 14 and 15.
  • a magnetic shunt formed of two stacks of rectangular sheets 16 and 17, shown in FIGS. 3 and 4, connects the intermediate parts of the lateral columns and of the central column of the magnetic circuit, in the zone situated on the one hand between the primary winding 7 and secondary windings 10 and 13.
  • the electrical windings are wound on carcasses in electrically insulating material, receiving covers of suitable shape also made of electrically insulating material.
  • the primary carcass 18 has a central mandrel 19 of tubular shape and shaped to fit around the central column 4 of the magnetic circuit.
  • the central mandrel ends in an outer flange 20 and an inner flange 21, the assembly defining an annular peripheral groove 22 in which the primary electrical winding 7 is wound.
  • the outer flange 20 is intended to be disposed towards the outside of the transformer, that is to say on the side opposite to the secondary carcass, while the inner flange 21 is intended to be vis-à-vis with the secondary carcass.
  • the vertical parts 28 and 29 of the primary carcass shown in Figure 6 are intended to be surrounded by the magnetic circuit of the transformer.
  • the corresponding vertical interior walls of the mandrel 19 are smooth, as shown in the figure, and receive with little play the edge of the sheets of the central column 4 of the magnetic circuit.
  • the horizontal walls of the mandrel are extended outwardly by flanges 23 and 24, the flange 23 being shaped to receive terminals 80 and 90 for electrical connection of primary winding.
  • the flange 23 further comprises an external axial groove 81 communicating with the annular peripheral groove 22 by a slot 82, the groove 81 extending on the mandrel 19.
  • the groove 81 is intended to receive axially a safety member sensitive to the temperature of the primary winding and the intensity of the current flowing through it. By this arrangement, the safety device is in the immediate vicinity of the winding, or even in direct contact with the first turns, thus improving the speed of tripping.
  • the internal faces of the flanges 23 and 24 as well as the internal horizontal faces of the mandrel comprise longitudinal ribs such as the rib 25.
  • the ribs 25 are chamfered at the ends, comprising for example the chamfer 26, facilitating the introduction of the carcasses on the circuit magnetic.
  • the ribs 25 define the bearing surface of the central column 4 of the magnetic circuit, and make it possible to provide rounded angles of the mandrel 19, fitting onto a column 4 of rectangular section and sharp edges.
  • the outer flange 20 comprises, in its horizontal upper portion, a lug 27 making it possible to temporarily fix the end of the electrical winding during the manufacture of the winding, before securing the end of the conductor to a terminal disposed on the rim 23, or preferably on one of the primary insulating covers.
  • the vertical parts 28 and 29 of the primary carcass are intended to be covered by insulating primary covers such as the cover 30 shown in FIG. 8.
  • the cover 30 comprises three main walls 31, 32 and 33, the parallel walls 31 and 33 being intended to partially cover the flanges of the primary carcass, the wall 32 being intended to partially cover the primary electrical winding. It is understood that the assembly formed by a cover 30, the mandrel 19 and the vertical parts 28 of the carcass defines an insulating box surrounded by the magnetic circuit and ensuring the electrical isolation between this magnetic circuit and the electrical winding wound on the carcass .
  • the ends of the walls 31 and 33 are connected by strips such as the strip 34, carrying means for hooking an electrical terminal, and simultaneously ensuring the stiffening of the cover 30.
  • An opening 340 is left between each strip 34 and the wall 32, to allow the entry and the flow of varnish during the impregnation of the winding.
  • the primary carcass cowls include, in their area not surrounded by a magnetic circuit, lugs 8 and 9 for connecting the primary winding.
  • the secondary carcass 41 shown in Figure 5, comprises a central mandrel 35, an inner flange 36 and an outer flange 37.
  • the horizontal inner faces of the mandrel 35 are provided with ribs such as the longitudinal rib 38.
  • Two flanges 39 and 40 extend the horizontal walls of the mandrel 35 beyond the internal flange 36. These flanges 39 and 40 are shaped to have the same length as the dimension of the magnetic shunt, and come to bear against the internal flange of the carcass primary.
  • the base of the external flange 37 of the secondary carcass 41 includes a hole 42 for the passage of a first end of the high voltage secondary winding, this first end coming to be connected to the high voltage terminal 11, terminal fixed on the circuit magnetic and connected to the ground of the microwave oven.
  • the inner flange 36 of the secondary carcass 41 is shaped in a particular way, as shown in Figures 5 and 4, and comprises an external annular housing 43 intended to contain the secondary electrical winding of heating 13.
  • the external annular housing 43 is limited towards the center of the carcass by an axial peripheral rim 44.
  • the housing has an axial depth only slightly greater than the diameter of the heating winding wire 13. Its periphery is limited by a shoulder 45 forming a cylindrical wall radially limiting the annular housing and connecting to an outer part of the flange 36.
  • the flange 36 is formed of an outer radial wall 47, connected by the shoulder 45 to an inner part 48, the inner part 48 being offset axially towards the inside of the carcass relative to the outer radial wall 47, to leave the pla this of the housing 43.
  • the high voltage secondary winding 10 covers the winding secondary heating 13.
  • the secondary carcass 41 is intended to receive secondary insulating covers such as the cover 50 shown in FIG. 7. Similarly to the primary winding carcass, the secondary carcass 41 receives two covers such as the cover 50, covering its parts verticals shown in FIG. 5.
  • the cover 50 has a shape similar to that of the cover 30, and comprises three main walls 51, 52 and 53.
  • a strip 54 ensuring the connection of the ends of the walls 51 and 53, in the area not surrounded by the magnetic circuit, receives a terminal 12 for electrical connection to which the second end of the high voltage secondary winding electrical conductor 10 is connected.
  • the inner flange 36 further comprises, on its outer face, lugs 49 intended to cooperate with a facet 510 of the corresponding wall 51 of the insulating cover 50 to define means for holding the outputs of the secondary electric heating coil.
  • the wall 51 or inner wall of the cover 52, comprises an external housing 55 limited by two lateral flanges 56 and 57 in the outer limit planes of the magnetic circuit and a transverse rim 58 in the plane of a vertical wall of the central mandrel 35 of the carcass.
  • the housing 55 is intended to contain and isolate a stack of sheets forming the magnetic shunt 16 or 17. The sheets are in contact with one of the lateral columns of the magnetic circuit, and are separated from the central column 4 by a defined air gap by the transverse edge 58 of the housing.
  • the sheets being in contact with one of the lateral columns of the magnetic circuit are earthed by contact on the main magnetic circuit.
  • external housings 55 also limited by two lateral edges 56 and 57 in the outer limit planes of the magnetic circuit, a first transverse edge 58 in the plane of a vertical wall of the central mandrel 35 of carcass, and further a second transverse rim, not shown in the figures, along the lateral leg of the magnetic circuit.
  • the external housing 55 is a bathtub closed on the four sides, and the air gap is defined by the sum of the thicknesses of the two transverse edges. It is then necessary to provide an electrical ground connection between the shunts and the magnetic circuit.
  • the housings 55 are arranged on the secondary insulating covers. According to another embodiment, provision could be made for the housings 55 to be arranged on the primary isolation covers.
  • the arrangement shown in the figures because it facilitates the automatic mounting of the assembly: it is indeed preferable to mount first, on the magnetic circuit, the secondary windings, then the primary winding; it is therefore understood that, by this mounting method, the stack of shunt sheets can be simply placed in the housings 55, in which the sheets are held by gravity.
  • the covers 50 when they are fitted to the secondary carcass 41, partially close the housing 43, and provide mechanical maintenance and electrical insulation of the secondary heating winding 13.
  • the secondary carcass includes, on the outer edge of one from its flanges, a radial lug 360 on which the first end of the high-voltage secondary winding wire can be wound on standby before connection to the output terminal, the other end of the winding wire leaving the carcass by the radial hole 42 near the central tunnel and connecting to the magnetic circuit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Induction Heating (AREA)
  • Insulating Of Coils (AREA)
  • Coils Of Transformers For General Uses (AREA)
EP88420153A 1987-05-11 1988-05-09 Elektrischer Transformator für Mikrowellenherde Withdrawn EP0294297A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8706927 1987-05-11
FR8706927A FR2615318A1 (fr) 1987-05-11 1987-05-11 Transformateur electrique pour four a micro-ondes

Publications (1)

Publication Number Publication Date
EP0294297A1 true EP0294297A1 (de) 1988-12-07

Family

ID=9351181

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88420153A Withdrawn EP0294297A1 (de) 1987-05-11 1988-05-09 Elektrischer Transformator für Mikrowellenherde

Country Status (6)

Country Link
US (1) US4812798A (de)
EP (1) EP0294297A1 (de)
JP (1) JPS63293804A (de)
KR (1) KR880014598A (de)
CA (1) CA1301868C (de)
FR (1) FR2615318A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5345565A (en) * 1991-03-13 1994-09-06 Ncr Corporation Multiple configuration data path architecture for a disk array controller
EP0727792A1 (de) * 1995-02-17 1996-08-21 Societe Electromecanique Du Nivernais Selni Hochspannungstransformator
EP0831500A2 (de) * 1996-09-21 1998-03-25 Samsung Electronics Co., Ltd. Hochspannungstransformator
WO2024120902A1 (fr) * 2022-12-08 2024-06-13 Valeo Eautomotive France Sas Transformateur triphase pour convertisseur de tension isole

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5440286A (en) * 1991-03-26 1995-08-08 North American Philips Corporation Electrical transformer structure with coil covers
US5138295A (en) * 1991-10-17 1992-08-11 North American Philips Corporation Electrical transformer arrangement with plate insulators
US5625520A (en) * 1993-11-19 1997-04-29 Daewoo Electronics Co., Ltd. Device for preventing a high voltage transformer of a microwave oven from being overheated
KR20040068679A (ko) * 2003-01-27 2004-08-02 삼성전자주식회사 고압 변압기
KR20040096233A (ko) * 2003-05-07 2004-11-16 삼성전자주식회사 고압 변압기 및 전자레인지
JP5869518B2 (ja) * 2013-05-10 2016-02-24 トヨタ自動車株式会社 リアクトル及びその製造方法
WO2021056004A2 (en) * 2019-08-05 2021-03-25 Thermo Scientific Portable Analytical Instruments Inc. Pot core transformer with magnetic shunt

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2858514A (en) * 1953-11-12 1958-10-28 Gen Electric Insulating and lead anchoring means for transformers
US3605055A (en) * 1970-07-02 1971-09-14 Gen Electric Two-piece winding bobbin for watt-hour meter potential coil
FR2123271A1 (de) * 1971-01-30 1972-09-08 Weimer Norbert
FR2215683A2 (de) * 1973-01-29 1974-08-23 Pye Ltd
US4405913A (en) * 1981-08-17 1983-09-20 Mid-West Transformer Company Coil body
DE8633338U1 (de) * 1986-12-12 1987-02-12 May & Christe Gmbh, Transformatorenwerke, 6370 Oberursel Streufeldtransformator für die Speisung von Magnetrons

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1426822A (en) * 1973-05-23 1976-03-03 Miles Platts Ltd Transformers
JPS5961913A (ja) * 1982-09-30 1984-04-09 Toshiba Electric Equip Corp リ−ケ−ジトランス
JPS60200507A (ja) * 1984-03-23 1985-10-11 Matsushita Electric Ind Co Ltd トランス

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2858514A (en) * 1953-11-12 1958-10-28 Gen Electric Insulating and lead anchoring means for transformers
US3605055A (en) * 1970-07-02 1971-09-14 Gen Electric Two-piece winding bobbin for watt-hour meter potential coil
FR2123271A1 (de) * 1971-01-30 1972-09-08 Weimer Norbert
FR2215683A2 (de) * 1973-01-29 1974-08-23 Pye Ltd
US4405913A (en) * 1981-08-17 1983-09-20 Mid-West Transformer Company Coil body
DE8633338U1 (de) * 1986-12-12 1987-02-12 May & Christe Gmbh, Transformatorenwerke, 6370 Oberursel Streufeldtransformator für die Speisung von Magnetrons

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 10, no. 46 (E-383)[2103], 22 février 1986; & JP-A-60 200 507 (MATSUSHITA DENKI SANGYO K.K.) 11-10-1985 *
PATENT ABSTRACTS OF JAPAN, vol. 8, no. 167 (E-258)[1604], 2 août 1984; & JP-A-59 61 913 (TOUSHIBA DENZAI K.K.) 09-04-1984 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5345565A (en) * 1991-03-13 1994-09-06 Ncr Corporation Multiple configuration data path architecture for a disk array controller
EP0727792A1 (de) * 1995-02-17 1996-08-21 Societe Electromecanique Du Nivernais Selni Hochspannungstransformator
FR2730850A1 (fr) * 1995-02-17 1996-08-23 Electro Mec Nivernais Transformateur haute tension
US5660756A (en) * 1995-02-17 1997-08-26 Societe Electromecanique Du Nivernais Selni High-voltage transformer for a microwave oven power supply
EP0831500A2 (de) * 1996-09-21 1998-03-25 Samsung Electronics Co., Ltd. Hochspannungstransformator
EP0831500A3 (de) * 1996-09-21 1998-06-03 Samsung Electronics Co., Ltd. Hochspannungstransformator
WO2024120902A1 (fr) * 2022-12-08 2024-06-13 Valeo Eautomotive France Sas Transformateur triphase pour convertisseur de tension isole
FR3143181A1 (fr) * 2022-12-08 2024-06-14 Valeo Eautomotive France Sas Composant électronique, notamment transformateur triphasé pour convertisseur de tension isolé

Also Published As

Publication number Publication date
US4812798A (en) 1989-03-14
CA1301868C (fr) 1992-05-26
JPS63293804A (ja) 1988-11-30
KR880014598A (ko) 1988-12-24
FR2615318A1 (fr) 1988-11-18

Similar Documents

Publication Publication Date Title
EP0294297A1 (de) Elektrischer Transformator für Mikrowellenherde
EP2677634B1 (de) Zwischenverbinder für einen Stator einer elektrischen Maschine und Stator mit einem derartigen Zwischenverbinder
CA1184621A (fr) Transformateur electrique et procede pour sa fabrication
FR2995739A1 (fr) Isolant de bobine apte a recevoir un capteur de temperature, interconnecteur pour stator et support pour capteur de temperature correspondants
FR2791806A1 (fr) Bobine d'allumage pour moteur a combustion interne
FR3071112A1 (fr) Systeme de connexion pour machine electrique.
EP2184835A1 (de) Elektrische umlaufende Maschine
FR2646550A1 (fr) Bobine d'allumage, en particulier pour moteur a combustion interne de vehicule automobile, et moyens de maintien de l'ensemble primaire dans le secondaire
EP0923785B1 (de) Hochspannungs-/niederspannungstransformator mit thermoplastischer trockenisolation
EP1019926B1 (de) Induktives bauelement und verfahren zur herstellung eines solchen bauelements
EP0099274B1 (de) Transformator, insbesondere zum Herabtransformieren von Spannungen für Elektroschweissgerät
EP0070752B1 (de) Sicherheitstransformator mit konzentrischen Wicklungen
FR2604570A1 (fr) Element de couverture pour espaces interpolaires
FR2616280A1 (fr) Carcasse de bobine de conducteurs electriques, destinee a etre montee sur un noyau rigide pour alternateur de vehicule automobile
FR2784787A1 (fr) Transformateur sec de puissance ou de distribution de l'energie electrique
FR2995472A1 (fr) Interconnecteur pour stator de machine electrique, cache isolant, et stator de machine electrique correspondants
EP0015166A1 (de) Rotor für drehende elektrische Maschine
FR2502836A1 (fr) Dispositif pour la realisation de bobinages electriques isoles, et procede d'assemblage de ce dispositif
FR3092445A1 (fr) Procédé pour mettre à la longueur et positionner des extrémités de conducteur pour la fabrication de stators de machines électriques et stators obtenus
FR2492153A1 (fr) Transformateur de petite taille
EP3535834B1 (de) Stator einer elektrischen drehmaschine mit einer verbindung mit verbesserter konfiguration
EP0165845B1 (de) Transformator mit starker Primär-Sekundär-Kupplung
FR2830994A1 (fr) Bobine pour machine electrique tournante, stator comportant une telle bobine et procede de fabrication
FR2656951A1 (fr) Transformateur de type torique.
FR2680912A1 (fr) Magnetron muni d'un blindage.

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

17P Request for examination filed

Effective date: 19890303

GBC Gb: translation of claims filed (gb section 78(7)/1977)
17Q First examination report despatched

Effective date: 19910625

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19921228