EP3444827A1 - Bobine de contact capturée - Google Patents

Bobine de contact capturée Download PDF

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Publication number
EP3444827A1
EP3444827A1 EP17196758.1A EP17196758A EP3444827A1 EP 3444827 A1 EP3444827 A1 EP 3444827A1 EP 17196758 A EP17196758 A EP 17196758A EP 3444827 A1 EP3444827 A1 EP 3444827A1
Authority
EP
European Patent Office
Prior art keywords
electrical contact
section
contact member
windings
coil
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Withdrawn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
EP17196758.1A
Other languages
German (de)
English (en)
Inventor
Joshua S. Wilson
Anthony A. Primavera
Matthew A. Porter
Bjoern Brunner
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.)
Biotronik SE and Co KG
Original Assignee
Biotronik SE and Co KG
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 Biotronik SE and Co KG filed Critical Biotronik SE and Co KG
Publication of EP3444827A1 publication Critical patent/EP3444827A1/fr
Withdrawn legal-status Critical Current

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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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2823—Wires
    • H01F27/2828—Construction of conductive connections, of leads
    • 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
    • H01F41/04—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 for manufacturing coils
    • H01F41/10—Connecting leads to windings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/04—Arrangements of electric connections to coils, e.g. leads
    • 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
    • H01F27/29—Terminals; Tapping arrangements for signal inductances
    • H01F27/292—Surface mounted devices

Definitions

  • the present invention relates to a method for producing an electrical coil as well as to such a coil, particularly to a coil for an implantable medical device (e.g. a communication coil).
  • a coil for an implantable medical device e.g. a communication coil
  • such coils can be created by tightly wrapping wire around a mandrel (e.g. core of an arbor).
  • a mandrel e.g. core of an arbor
  • the ends of such wound wires are usually very difficult to handle when making electrical connections to other components/electrical contacts.
  • each end of the coil might be even smaller than 50 ⁇ m in diameter. This creates complications in handling, and can lead to breaks in the wire which can cause the component to fail.
  • the wire ends must be grabbed and manipulated, typically with a tweezer, into a specific position. Then the wire position must be held while a securing process takes place.
  • the objective of the present invention is to provide a coil as well as a method for producing such a coil that can be easily handled when making electrical connections to the coil.
  • a method wherein a wire cladded with an electrically insulation is wound so as to form a coil bundle comprising a plurality of layers arranged on top of one another, wherein each layer comprises a plurality of windings of the wire, and wherein upon winding of said coil bundle a first electrical contact member is arranged in the coil bundle (e.g.
  • each of said first windings comprises a wire section arranged on said front side of said first section of the first electrical contact member, wherein electrical insulation is removed from said wire sections to form exposed wire regions, and wherein said exposed wire regions are soldered to said front side of said first section of said first electrical contact member.
  • the method/coil according to the present invention does not require the same level of extreme precision as required with coils according to the state of the art.
  • An electrical contact member e.g. a flat elongated conductor such as a thin foil
  • an ablation process can be applied to the surface windings which run over the front side of the electrical contact member in order to expose the wire. This means that the inner windings are protected from the removal of the insulation by the electrical contact member itself.
  • a generic solder process can electrically connect the electrical contact member to respective windings running over the front side of the electrical contact member.
  • the first electrical contact member comprises a second section that is connected to the first section of the first electrical contact member via a connecting section, wherein upon winding of the coil bundle the second section is arranged between two neighboring layers of the coil bundle for anchoring the first electrical contact member in the coil bundle, wherein the connecting section of the first electrical contact member is arranged outside the coil bundle for forming an electrical contact configured to be soldered to an electrical contact on a substrate (e.g. a PCB).
  • a substrate e.g. a PCB
  • a second electrical contact member is arranged in the coil bundle (e.g. between neighboring layers) such that a plurality of successive second windings extend over a front side of a first section of the second electrical contact member, wherein each of said second windings comprises a wire section arranged on said front side of said first section of the second electrical contact member, wherein electrical insulation is removed from said wire sections of the second windings to form exposed wire regions, and wherein said exposed wire regions of the second windings are soldered to said front side of said first section of said second electrical contact member.
  • the second electrical contact member comprises a second section that is connected to the first section of the second electrical contact member via a connecting section of the second electrical contact member, wherein upon winding of the coil bundle the second section is arranged between two neighboring layers of the coil bundle for anchoring the second electrical contact member in the coil bundle, wherein the connecting section of the second electrical contact member is arranged outside the coil bundle for forming an electrical contact configured to be soldered to an electrical contact on a substrate (e.g. a PCB).
  • a substrate e.g. a PCB
  • both connecting sections may comprise a curved shape so as to connect the first and second section of the respective electrical contact member, which first and second sections are integrated into the coil bundle and may extend essentially parallel with respect to each other.
  • first and/or the second electrical contact member may be formed as an e.g. elongated conducting foil formed e.g. out of Cu or another suitable electrically conducting material.
  • said first windings form an innermost layer of windings of the coil bundle.
  • said second windings form an outermost layer of windings of the coil bundle.
  • the wire is wound on an arbor for forming said coil bundle
  • the arbor comprises a core extending along an axis, the core connecting two opposing plates of the arbor.
  • each plate comprises a first slot extending from a circumferential edge of the respective plate towards the core.
  • these first slots are used for arranging the first electrical contact member in the coil bundle when the coil bundle is formed by winding the wire on the core of the arbor.
  • each plate comprises a second slot extending from a circumferential edge of the respective plate towards the core.
  • these second slots are used for arranging the second electrical contact member in the coil bundle when the wire is wound on the arbor's core.
  • the first windings are wound on the core of the arbor (e.g. by rotating the arbor about said axis of the core), wherein the first section of the first electrical contact member is laid into said first slots onto said first windings so that said front side of said first section of the first electrical contact member contacts said first windings and a second section (and particularly said connecting section) of the first electrical contact member protrudes out of the arbor through one of the first slots, wherein a plurality of windings is wound onto the first section of the first electrical contact member, wherein the second section of the first electrical contact member is folded back and laid into the first slots on top of said plurality of windings, and wherein a further plurality of windings is wound on top of said second section of the first electrical contact member, particularly such that the connecting section of the first electrical contact member protrudes out of the coil bundle for forming an (e.g. surface-mountable) electrical contact.
  • an electrical contact e.g. surface-mountable
  • the second section of the second electrical contact member is laid into said second slots on top of said plurality of windings such that the first section (and particularly the connecting section) of the second electrical contact member protrudes out of the arbor through a second slot, wherein after having wound a further plurality of windings on top of said second section of the second electrical contact member, the first section of said second electrical contact member is folded back and laid into the second slots on top of said further plurality of windings, and wherein said second windings are wound on top of said front side of said first section of the second electrical contact member, particularly such that the connecting section of the second electrical contact member protrudes out of the coil bundle for forming an (e.g. surface-mountable) electrical contact.
  • an electrical contact e.g. surface-mountable
  • a coil comprising: a coil bundle comprising a wound wire cladded with an electrical insulation, wherein the wound wire forms a plurality of layers of windings, which layers are arranged on top of one another, and wherein each layer comprises a plurality of windings of said wire, and at least a first electrical contact member for electrically contacting the coil bundle, the first electrical contact member comprising a first section, wherein a plurality of successive first windings extends over a front side of said first section, wherein the first windings each comprise a wire section that is arranged on said front side of said first section of the first electrical contact member and comprises a recess in the electrical insulation to form an exposed wire region that is soldered to said front side of said first section of said first electrical contact member.
  • the first electrical contact member comprises a second section that is connected to the first section of the first electrical contact member via a connecting section, wherein the second section is arranged between two neighboring layers of the coil bundle for anchoring the first electrical contact member in the coil bundle, and wherein the connecting section of the first electrical contact member protrudes from the coil bundle and forms an electrical contact, e.g. for making an electrical connection (e.g. by way of soldering) to another electrical contact that may be arranged on a substrate such as a printed circuit board (PCB).
  • PCB printed circuit board
  • the coil further comprises a second electrical contact member for electrically contacting the coil bundle, the second electrical contact member comprising a first section, wherein a plurality of successive second windings extend over a front side of said first section of the second electrical contact member, wherein the second windings each comprise a wire section that is arranged on said front side of said first section of the second electrical contact member and comprises a recess in the electrical insulation to form an exposed wire region that is soldered to said front side of said first section of said second electrical contact member.
  • the second electrical contact member comprises a second section that is connected to the first section of the second electrical contact member via a connecting section of the second electrical contact member, wherein the second section of the second electrical contact member is arranged between two neighboring layers of the coil bundle for anchoring the second electrical contact member in the coil bundle, and wherein the connecting section of the second electrical contact member protrudes from the coil bundle and forms an electrical contact, e.g. for making an electrical connection (e.g. by way of soldering) to another electrical contact that may be arranged on a substrate such as a PCB.
  • said first windings form an innermost layer of windings of the coil bundle and/or wherein said second windings form an outermost layer of windings of the coil bundle.
  • the first section of the first electrical contact member is arranged between said innermost layer and an adjacent neighboring layer arranged on top of said innermost layer, and wherein the second section of the first electrical contact member is arranged between two further neighboring layers for anchoring the first electrical contact member in the coil bundle.
  • the first section of the second electrical contact member is arranged between said outermost layer and an adjacent neighboring layer arranged below said outermost layer, and wherein the second section of the second electrical contact member is arranged between two further neighboring layers of the coil bundle for anchoring the second electrical contact member in the coil bundle.
  • Figs. 1 and 2 show an arbor 30 that can be used in the method according to the present invention in order to wind a wire 10 for forming a coil bundle 2 of a coil 1 according to the present invention.
  • the arbor 30 comprises a core (also denoted as mandrel) 31 extending along an axis A about which the core 31 is rotated to wind the wire 10 onto the core 31.
  • the arbor 30 further comprises two parallel (e.g. circular) plates 32, 33 that are connected by the core 31, so that the wire 10 can be wound in several layers to form the coil bundle 2.
  • each plate 32, 33 comprises a first slot 300 extending from a circumferential edge 32a, 33a of the respective plate 32, 33 towards the perimeter of the core 31 as well as a second slot 301 also extending from the circumferential edge 32a, 33a of the respective plate 32, 33 towards the perimeter of the core 31.
  • the first slots 300 face each other in said axial direction A.
  • the second slots 301 face each other in said axial direction A.
  • a single layer of wire i.e. a plurality of first windings 5
  • a first section 101 of a first electrical contact member 100 e.g. in form of a conductive elongated foil, is pulled over the top of this (innermost) layer 5 of the coil bundle 2 to be formed through the space created by the first slots 300 in the plates 32, 33.
  • a front side 101a of this first section 101 contacts the first windings 5.
  • a second section 103 of this first electrical contact member / foil 100 which second section 103 is connected to the first section 101 via a connecting section 102, is pulled back through the same slots 300, such that the connecting section 102 forms a bend protruding from the body of the coil 1 enough to provide a stand-off.
  • the second section 103 is now arranged between two adjacent layers 3a, 3b of the bundle 2 and faces the first section 101 of the first electrical contact member 100.
  • wire sections 50 of the single innermost layer 5 i.e. the first windings
  • the first electrical contact member (e.g. foil) 100 have their insulation 11 removed in the area immediately in front of the front side 101a of the first section 100 of the first electrical contact member (e.g. foil) 100.
  • Solder S is then laid over the respective region of exposed wire 51 of said wire sections 50 to electrically connect the coil bundle to the first electrical contact member 100.
  • This first electrical contact member (e.g. foil) 100 now represents one of the coil terminations.
  • the connecting section 102 forms an electrical contact 104 that can be electrically connected to a contact 105 on a substrate 106 such as a printed circuit board by means of solder S.
  • a similar second electrical contact member 200 laid into the bundle 2 (e.g. at the other side of the coil bundle 2) can be processed in a similar way and may become the other termination of the coil 1.
  • a second electrical contact member 200 which comprises a first section 201 having a front side 201 a, which first section 201 is connected to a second section 203 via a connecting section 202 of the second electrical contact member 200.
  • the second electrical contact member may be formed out of an elongated foil (see also above).
  • the second section 203 of the second electrical contact member 200 is laid into said second slots 301 on top of said plurality of windings wound onto the core 31 such that the first section (201) of the second electrical contact member (200) protrudes out of the arbor 30 through one of the second slots 301, wherein after having wound a further plurality of windings on top of said second section 203 of the second electrical contact member 200, the first section 201 of said second electrical contact member 200 is folded back and laid into the second slots 301 on top of said further plurality of windings, such that the connecting section 202 also protrudes from the body of the coil 1 (see also above).
  • second windings 6 forming an outermost layer 6 of the coil bundle 2 are wound on top of said front side 201a of said first section 201 of the second electrical contact member 200. Also here, electrical insulation is removed from those wire sections 60 of the second windings 6 that are arranged on top of said front side 201a to provide exposed wire regions 61 that are then soldered to the front side 201a by means of a suitable solder S as before. Also here, the second section 203 of the second electrical contact member is arranged/anchored between two adjacent layers 3c, 3d of the coil bundle 2.
  • the connecting section 202 forms an electrical contact 204 that can be electrically connected to a contact 205 on said substrate 106 by means of solder S.
  • the coil 1 is now a surface mountable component which can be connected to a substrate 106 with a normal solder fillet.
  • the coil 1 can be manufactured without the need for handling, stripping and adhering the single strands of fine wire 10 which are part of the traditional coil assembly process.
  • the respective electrical contact member 100, 200 protects the remaining windings when removing electrical insulation from said wire sections 50, 60 of said first or second windings 5, 6.
  • the coil according to the present invention is ready for typical SMT processes, with stand-off electrical contact members 100, 200 that remove the problem of coplanarity by separating the two surfaces.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Windings For Motors And Generators (AREA)
EP17196758.1A 2017-08-15 2017-10-17 Bobine de contact capturée Withdrawn EP3444827A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US201762545498P 2017-08-15 2017-08-15

Publications (1)

Publication Number Publication Date
EP3444827A1 true EP3444827A1 (fr) 2019-02-20

Family

ID=60138221

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17196758.1A Withdrawn EP3444827A1 (fr) 2017-08-15 2017-10-17 Bobine de contact capturée

Country Status (1)

Country Link
EP (1) EP3444827A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB275471A (en) * 1926-12-17 1927-08-11 British Electric Transformer C Improvements in or relating to electrical transformers
US2154070A (en) * 1936-07-16 1939-04-11 Western Electric Co Electrical coil
US3142030A (en) * 1958-11-10 1964-07-21 Basic Products Corp Coil construction to facilitate tapping

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB275471A (en) * 1926-12-17 1927-08-11 British Electric Transformer C Improvements in or relating to electrical transformers
US2154070A (en) * 1936-07-16 1939-04-11 Western Electric Co Electrical coil
US3142030A (en) * 1958-11-10 1964-07-21 Basic Products Corp Coil construction to facilitate tapping

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