EP2816572A1 - Inducteur - Google Patents

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Publication number
EP2816572A1
EP2816572A1 EP13172269.6A EP13172269A EP2816572A1 EP 2816572 A1 EP2816572 A1 EP 2816572A1 EP 13172269 A EP13172269 A EP 13172269A EP 2816572 A1 EP2816572 A1 EP 2816572A1
Authority
EP
European Patent Office
Prior art keywords
permeance
low
gap
magnetic core
inductor
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Withdrawn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
EP13172269.6A
Other languages
German (de)
English (en)
Inventor
Radoslaw Jez
Wojciech Jurczak
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.)
ABB Research Ltd Switzerland
ABB Research Ltd Sweden
Original Assignee
ABB Research Ltd Switzerland
ABB Research Ltd Sweden
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 ABB Research Ltd Switzerland, ABB Research Ltd Sweden filed Critical ABB Research Ltd Switzerland
Priority to EP13172269.6A priority Critical patent/EP2816572A1/fr
Publication of EP2816572A1 publication Critical patent/EP2816572A1/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Withdrawn legal-status Critical Current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
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H01F3/14—Constrictions; Gaps, e.g. air-gaps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F17/06—Fixed inductances of the signal type  with magnetic core with core substantially closed in itself, e.g. toroid
    • H01F17/062—Toroidal core with turns of coil around it

Definitions

  • the invention relates to an inductor according to a preamble of independent claim 1.
  • a known inductor comprises a magnetic core and a conductor coiled around the magnetic core.
  • the magnetic core forms a closed loop path for a magnetic flux, and has a high permeance element interrupted by a low-permeance gap.
  • a reluctance of a magnetic path of the inductor is not uniform for each part of a cross-section of the magnetic core.
  • Value of the reluctance of the magnetic path increases as the distance from a centre point of the inductor increases.
  • the variable length of magnetic path causes variable value of reluctance and non-uniform distribution of magnetic flux density.
  • the highest value of the magnetic flux density occurs in an inner portion of the magnetic core while the lowest value of the magnetic flux density occurs in an outer portion of the magnetic core. It means that the inner portion of the magnetic core will be saturated before the outer portion and that it is not possible to utilize a full potential of the magnetic core.
  • An object of the present invention is to provide an inductor so as to solve the above problems.
  • the objects of the invention are achieved by an inductor which is characterized by what is stated in the independent claim.
  • the preferred embodiments of the invention are disclosed in the dependent claims.
  • the invention is based on the idea of forming a low-permeance gap of a magnetic core as a non-uniform gap, the non-uniform gap being wider in an inner portion of the magnetic core than in an outer portion of the magnetic core.
  • the wider gap in the inner portion of the magnetic core has a higher reluctance than the narrower gap in the outer portion of the magnetic core. Due to the non-uniform low-permeance gap a reluctance of a magnetic path of an inductor may be designed substantially uniform for each part of a cross-section of a magnetic core.
  • An advantage of the inductor of the invention is that the non-uniform gap decreases the problem with saturation in the inner portion of the magnetic core by providing more uniform distribution of the magnetic flux density.
  • the invention also enables increasing power density of an inductor.
  • the inductor comprises a magnetic core 2 and a conductor 8 coiled around the magnetic core 2.
  • the conductor 8 is electrically insulated from the magnetic core 2.
  • An electric current flowing in the conductor 8 creates a magnetic field around the conductor 8.
  • the magnetic core 2 forms a closed loop path for a magnetic flux, the magnetic core 2 having a high permeance element 4 interrupted by a low-permeance gap 6.
  • the low-permeance gap 6 has an inner portion 61 and an outer portion 62, a distance between a centre 41 of the magnetic core 2 and the outer portion 62 being greater than a distance between the centre 41 of the magnetic core 2 and the inner portion 61.
  • the inner portion 61 of the low-permeance gap 6 has a substantially greater dimension in a circumferential direction than the outer portion 62 of the low-permeance gap 6.
  • the circumferential direction is a direction perpendicular to a radial direction of the magnetic core 2.
  • Surfaces 46 and 48 of the high permeance element 4 defining the low-permeance gap 6 are substantially planar surfaces.
  • a gap angle ⁇ between the surfaces 46 and 48 is 20 degrees.
  • the surfaces 46 and 48 are located symmetrically with relation to a radial direction 42 of the magnetic core 2.
  • the radial direction 42 of the magnetic core 2 bisects the gap angle ⁇ .
  • a dimension of the inner portion 61 of the low-permeance gap 6 in the circumferential direction is approximately fourfold compared to a dimension of the outer portion 62 of the low-permeance gap 6 in the circumferential direction.
  • the inner portion 61 is approximately 300% wider than the outer portion 62.
  • a form of a non-uniform low-permeance gap varies depending on the embodiment.
  • a gap angle between the surfaces of the high permeance element defining the low-permeance gap is 10 degrees, and a dimension of the inner portion of the low-permeance gap in the circumferential direction is double compared to a dimension of the outer portion of the low-permeance gap in the circumferential direction.
  • Material of the high permeance element 4 comprises ferrite, and material of the low-permeance gap 6 comprises air.
  • material of a high permeance element may comprise iron powder, amorphous material, oriented steel or non-oriented steel, and material of a low-permeance gap may comprise resins, plastics or carbon fibres.
  • materials of high permeance element and low-permeance gap are selected such that permeability of material of the high permeance element is at least ten times greater than permeability of material of the low-permeance gap.
  • the inductor of Figure 1 is a toroidal inductor.
  • the magnetic core 2 is a ring-shaped magnetic core.
  • the ring-shaped magnetic core has a form of a solid of revolution.
  • the toroidal shape provides a high value of inductance and decreases leakage flux.
  • the non-uniform low-permeance gap of the invention may be incorporated in any inductor whose magnetic core forms a closed loop path for a magnetic flux, and has a high permeance element interrupted by a low-permeance gap.
  • the conductor 8 has seven turns, and terminals 81 and 82 of the conductor 8 are adjacent the low permeance gap 6, located on opposite sides of the low permeance gap 6. Number of turns of conductor is selected based on desired inductance. Therefore the number of turns of conductor varies in different embodiments. Further, locations of terminals of conductor may be selected based on requirements of an embodiment.
  • the magnetic core of the inductor depicted in Figure 1 comprises one low-permeance gap.
  • a low-permeance gap may be divided into several low-permeance gap sections.
  • An inductor according to the invention may have one or more low-permeance gaps whose inner portion has a substantially greater dimension in a circumferential direction than outer portion.
  • An inductor according to the invention may additionally comprise one or more conventional low-permeance gaps whose inner portion and outer portion have substantially equal dimensions in a circumferential direction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)
EP13172269.6A 2013-06-17 2013-06-17 Inducteur Withdrawn EP2816572A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13172269.6A EP2816572A1 (fr) 2013-06-17 2013-06-17 Inducteur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13172269.6A EP2816572A1 (fr) 2013-06-17 2013-06-17 Inducteur

Publications (1)

Publication Number Publication Date
EP2816572A1 true EP2816572A1 (fr) 2014-12-24

Family

ID=48628334

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13172269.6A Withdrawn EP2816572A1 (fr) 2013-06-17 2013-06-17 Inducteur

Country Status (1)

Country Link
EP (1) EP2816572A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020149458A1 (en) * 2000-09-08 2002-10-17 Tokin Corporation Magnetically biasing bond magnet for improving DC superposition characteristics of magnetic coil
DE10234979A1 (de) * 2002-07-31 2004-02-12 Epcos Ag Drosselkern für nichtlineare Kerndrossel und Verfahren zur Herstellung
US20040085174A1 (en) * 2002-11-01 2004-05-06 Decristofaro Nicholas J. Bulk laminated amorphous metal inductive device
DE102010015410A1 (de) * 2010-04-19 2011-10-20 SUMIDA Components & Modules GmbH Induktives Bauelement mit variablen Kerneigenschaften und Verfahren zu deren Einstellung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020149458A1 (en) * 2000-09-08 2002-10-17 Tokin Corporation Magnetically biasing bond magnet for improving DC superposition characteristics of magnetic coil
DE10234979A1 (de) * 2002-07-31 2004-02-12 Epcos Ag Drosselkern für nichtlineare Kerndrossel und Verfahren zur Herstellung
US20040085174A1 (en) * 2002-11-01 2004-05-06 Decristofaro Nicholas J. Bulk laminated amorphous metal inductive device
DE102010015410A1 (de) * 2010-04-19 2011-10-20 SUMIDA Components & Modules GmbH Induktives Bauelement mit variablen Kerneigenschaften und Verfahren zu deren Einstellung

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