Classifications

• • 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)
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
  • H01F38/20—Instruments transformers
  • H01F38/22—Instruments transformers for single phase AC
  • H01F38/28—Current transformers
  • H01F38/30—Constructions
• • 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
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49002—Electrical device making
  • Y10T29/4902—Electromagnet, transformer or inductor
  • Y10T29/49073—Electromagnet, transformer or inductor by assembling coil and core
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49002—Electrical device making
  • Y10T29/4902—Electromagnet, transformer or inductor
  • Y10T29/49075—Electromagnet, transformer or inductor including permanent magnet or core
  • Y10T29/49078—Laminated

Definitions

• the present invention relates to a method of mounting an electric coil on a magnetic circuit with an air gap of a current sensor, this circuit consisting of a stack of sheets made of a magnetically permeable material.
• the present current sensors the magnetic circuit of which has a single air gap, nevertheless require a magnetic circuit formed by two separate parts or by stacks of two groups of sheet metal parts to allow the mounting of a coil on a branch of the magnetic circuit. .
• Such a structure, and the mounting method which results therefrom, are expensive and make automatic mounting installations relatively complex.
• the invention aims to provide a method of mounting at least one coil on a magnetic circuit which is much simpler and economical, in particular for automated mounting in mass production.
• the method according to the invention is characterized in that a stacking of sheets is produced, all having the general shape of the magnetic circuit and being displaceable in their plane relative to each other, which is grasped. stacking, that at least part of the circuit is deformed near the air gap relative to the plane of the sheets, so as to allow the coil to be placed on a part close to the air gap, and that brings the deformed parts of the circuit back into the plane of the sheets after having installed the coil.
• At least part of the circuit is kept fixed during the deformation. circuit opposite to the air gap.
• the deformation of the sheets is distributed over the major part of the circuit which is not kept fixed.
• the sheets are deformed, then brought back into their plane, by means of at least one pusher.
• This pusher may comprise an at least temporarily integral part of the coil.
• the invention relates in particular to the application of the present method to a magnetic circuit having an air gap inside a rectilinear part of the circuit and to a coil of length comprised between those of said branches, and in this case, the procedure is carried out. to a final positioning of the coil, once the circuit has been brought back into the plane of the sheets, in a position in which the air gap is located inside the coil.
• the invention also relates to a current sensor manufactured using the method according to claim 1.
• Such a sensor can advantageously have a magnetic circuit which comprises a rectilinear base branch and two inclined rectilig ⁇ es branches forming an acute angle with the base branch, first ends of the inclined branches being connected to the base branch, and second ends of the inclined branches being arranged to form the air gap of the magnetic circuit.
• Fig. 1 shows a magnetic circuit with a coil mounted according to the invention
• Fig. 2 illustrates the partial folding of the sheets and the positioning of the coil in the case of the circuit of FIG. 1;
• Fig. 3 shows a variant of the shape of the sheets of a magnetic circuit
• Figures 4 and 5 show a magnetic circuit using sheets according to Fig. 3 with a coil placed respectively in a provisional position and in its final position, and
• Fig. 6 shows another form of magnetic circuit carrying two coils mounted according to the invention.
• Fig. 1 is a side view of a magnetic circuit 1 having an air gap 2 and carrying, on a branch close to the air gap, a coil 3 wound on a coil body 3a.
• Circuit 1 is formed by a stack of flat sheets, as shown in the top view of FIG. 2. The individual sheets all have the shape of the circuit shown in FIG. 1. They are not glued to each other but remain movable between them along their contact surfaces. They can however be held together by rivets inserted in the openings 4 and 5 visible in FIG. 1. After mounting the coil, these sheets will also be held by the coil body 3a.
• Fig. 2 illustrates a folding, as it can be carried out in the present method, to deform the upper branch intended to carry the coil, outside the plane of the sheets joined together and held in place in their lower part.
• the folding angle is a function of the transverse dimension of the coil, in this case the radius or half the width of the flanges of the coil body 3a, and half the thickness of the stack of sheets, so as to allow this coil on the folded branch of the circuit. After the coil has been put in place, this branch is folded back to bring it back into the plane of the non-deformed parts of the circuit.
• Figs. 3 to 5 show another form of an essentially rectangular circuit 6, according to which the air gap is located inside a long side of the circuit.
• Fig. 3 is a side view of this circuit, moreover similar to that of FIG. 1.
• Fig. 4 shows this circuit with a coil 7 placed on one of the branches 8 forming the air gap, this coil having for example been threaded on this branch in a similar manner to that illustrated in FIG. 2.
• it is not the branch 8 carrying the coil, but the rest of the circuit which can be deformed outside the plane of the sheets to allow the passage of the coil on branch 8 kept straight in this case.
• the sheets can be held during folding by a single rivet 10, or even by a clamp-shaped member which holds the sheets in a zone 11, so as to allow a distribution of the deformation over the rest of the circuit.
• a single rivet 10 or even by a clamp-shaped member which holds the sheets in a zone 11, so as to allow a distribution of the deformation over the rest of the circuit.
• the shape of the circuit around the reinforcement for the rivet hole 10 which reduces the rigidity of the circuit at this location compared to the example in FIG. 1.
• Fig. 4 shows that the coil 7 can include a housing 22 for a magnetic field detector which will be placed in the air gap of the circuit.
• the coil is moved on the circuit, after the latter has been returned to planar shape, so that this housing is placed at the location of the air gap and that the latter is therefore at inside the coil, which is advantageous for the performance of a current sensor using this circuit.
• a pusher-type member the action of which can for example be exerted in a place 12 on the sheet pack, and this in such a way that the individual sheets can move relative to one another during the deformation.
• the deformation will have the character of a more complex folding or deformation, implying a twist of at least one branch of the circuit.
• the pusher may comprise an integral part of the spool, at least during the deformation or folding action, so as to use the movement of the spool bringing it facing the end of branch 8, to spread the end of branch 9.
• Fig. 6 shows a magnetic circuit 13 which comprises a straight base branch 14 and two straight branches 15, 16 inclined with respect to this base branch.
• One of the ends of each of the branches 15, 16 is connected to the base branch by means of parts such as 17, 18, the other ends, free, forming an air gap 19.
• Coils 20, 21 are arranged on the branches respective 15, 16, these coils being shown schematically to illustrate their size relative to the circuit 14. It emerges from this representation that the maximum values of the length and of the transverse dimension of these coils which allow the positioning thereof by a spacing of the free ends of the branches 15, 16, perpendicular to the plane of the sheets, depend on one another.
• the air gap can be placed according to FIG. 6, perpendicular to the branch 14, or can be formed between the front face of one of the inclined branches and the lateral side of the other, so as to be oriented parallel to the latter branch.
• the present method is more particularly applicable to the manufacture of current sensors of the type described in Swiss patent No. 677 034, the content of which is to be considered as an integral part of the present description.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Transformers For Measuring Instruments (AREA)
• Measuring Magnetic Variables (AREA)
• Geophysics And Detection Of Objects (AREA)
• Electromagnets (AREA)
• Coils Or Transformers For Communication (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=4180697

Family Applications (1)

Country Status (6)

Families Citing this family (16)

Family Cites Families (12)

• 1992
  • 1992-01-21 CH CH16392A patent/CH685892A5/fr not_active IP Right Cessation
• 1993
  • 1993-01-20 WO PCT/CH1993/000010 patent/WO1993014509A1/fr not_active Ceased
  • 1993-01-20 DE DE69314729T patent/DE69314729T2/de not_active Expired - Lifetime
  • 1993-01-20 JP JP05512050A patent/JP3118257B2/ja not_active Expired - Lifetime
  • 1993-01-20 EP EP93901617A patent/EP0584295B1/de not_active Expired - Lifetime
  • 1993-01-20 US US08/119,089 patent/US5457873A/en not_active Expired - Lifetime
• 1995
  • 1995-10-04 US US08/539,225 patent/US6052048A/en not_active Expired - Lifetime

Non-Patent Citations (1)

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