WO1992015103A1 - Reacteur a circuit magnetique toroïdal constitue de bobinages d'un conducteur plat enroule en spirale - Google Patents

Reacteur a circuit magnetique toroïdal constitue de bobinages d'un conducteur plat enroule en spirale Download PDF

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Publication number
WO1992015103A1
WO1992015103A1 PCT/IT1992/000009 IT9200009W WO9215103A1 WO 1992015103 A1 WO1992015103 A1 WO 1992015103A1 IT 9200009 W IT9200009 W IT 9200009W WO 9215103 A1 WO9215103 A1 WO 9215103A1
Authority
WO
WIPO (PCT)
Prior art keywords
coils
reactor
flat conductor
coil
wound
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.)
Ceased
Application number
PCT/IT1992/000009
Other languages
English (en)
Inventor
Giuseppe Marchegiani
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.)
SIRTEN Srl
Original Assignee
SIRTEN Srl
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
Priority claimed from ITMI910358A external-priority patent/IT1249596B/it
Application filed by SIRTEN Srl filed Critical SIRTEN Srl
Publication of WO1992015103A1 publication Critical patent/WO1992015103A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • H01F27/2895—Windings disposed upon ring cores

Definitions

  • Purpose of this present invention is a reactor having a toroidal magnetic circuit giving a high level of ef ⁇ ficiency .
  • the reactor is formed of a group of coils, each consisting of a spirally wound flat con- ductor, said coils being mounted radially so that the centre of each one coincides with a geometric circle to
  • each single flat conductor is parallel to the lines of magnetic flow, and that the smaller dimension, namely the thickness, is crosswise to said lines of flow. It is possible to have numerous coils in parallel, with thin conductors of this kind that will minimize parassi- tic effects, caused by the variable magnetic flow through said conductors, and which lead to an uneven distribution of current and consequent additional losses.
  • the toroidal reactor realized using this constructional technique will therefore have low losses due to high fre ⁇ quency current while inductance value will remain constant as the frequency varies.
  • each single coil may be circular or may be a long oval in shape.
  • the beginning and end of the spiral are in the centre of the coil and external to it.
  • the toroidal winding is formed of said coils mounted sym- metrical 1y .
  • the beginning and end of the elementary coils are connec ⁇ ted in series or in parallel, or in both, so as to create a number of ways in parallel. Connections are made so that circulating currents together form the internal magnetic flow.
  • z/k is the number of coils that will therefore be connected in series.
  • the empty space between component coils and around the toroid serves for cooling purposes.
  • Total current is in fact evenly split up among the groups in parallel for reasons of symmetry without any need for transposi ions. No "circulating" current can exist and losses due to high frequency are greatly reduced.
  • One variation may be obtained by mounting internally a toroidal-shaped core of magnetic material and this can be divided into several parts or be a single whole; in the latter case the coils must be wound directly onto the core .
  • One advantage of the core solution is that of obtaining a greater magnetic flow with respect to an equal number of Ampere-turns in the winding.
  • the structure here described, with or without internal core, can be used not only to obtain an inductor but al- so to realize a transformer.
  • part of the elementary coils are primary and part are secondary; primary and secondary coils may have different numbers of turns, a different cross sec ⁇ tion of the elementary conductor and also a different configuration.
  • the flat conductor described may be solid but may also be stranded and flattened.
  • This latter form is suitable for strong current at high frequency; the advantage consists in the presence of numerous stranded conductors in parallel, all with a small cross section, more easily wound, giving reduced losses and with all ends on the outside.
  • I is the total current, n the number of turns in each coil, z the total number of coils and k the number of ways in parallel, the total magnetomotive force acting on the toroid is I-n «z/k, while the current that passes through each flat conductor is I/k.
  • a winding is thus formed in which the conductor fills up practically 100% of the space available for it.
  • Two or more flat conductors of different widths can be used for each spiral.
  • the narrower conductor is placed internally in the spiral and thus also inside the toroid.
  • FIG. 1 Front view of a component coil.
  • Fig. 2 Th'e same coil seen from the side.
  • FIG. 4 Illustration of how two coils are connected.
  • the toroid winding 10 comprises component coils 11 each formed of a flat conductor 12 wound spirally. Said coils are mounted symmetrically so that their centres lie in a circle and form a toroid.
  • n the number of turns in the component coils
  • N the number of turns in series in the toroid
  • z the number of component coils
  • K the number of ways in parallel we then have :
  • N n z_
  • the flat conductors in the various coils may be connected in pairs by joining up the internal ends.
  • Fig. 4 shows how two radial coils 14 and 17 are joined up, drawn on a single geometrical plane.
  • the inner end 15 of the coil 14 is con- nected, by means of the length 20 common to both, to the inner end 18 of the coil 17.
  • coils 14 and 17, respectively 16 and 19 are connected to the other radial coils, in parallel or in series.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)

Abstract

Réacteur à cricuit magnétique toroïdal (10) exposé à l'air, constitué d'un groupe de bobinages (11) obtenu à partir d'un conducteur plat enroulé en spirale (12) monté en étoile de telle sorte que les centres des spirales soient disposés en cercle.
PCT/IT1992/000009 1991-02-13 1992-02-04 Reacteur a circuit magnetique toroïdal constitue de bobinages d'un conducteur plat enroule en spirale Ceased WO1992015103A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
ITMI910358A IT1249596B (it) 1991-02-13 1991-02-13 Reattore con circuito magnetico toroidale costituito da un'insieme di bobine a spirale in piattina
ITMI91A000358 1991-02-13
ITVO910911 1991-12-20
ITMIVO911F/91 1991-12-20

Publications (1)

Publication Number Publication Date
WO1992015103A1 true WO1992015103A1 (fr) 1992-09-03

Family

ID=26330667

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT1992/000009 Ceased WO1992015103A1 (fr) 1991-02-13 1992-02-04 Reacteur a circuit magnetique toroïdal constitue de bobinages d'un conducteur plat enroule en spirale

Country Status (2)

Country Link
AU (1) AU1268292A (fr)
WO (1) WO1992015103A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19635749A1 (de) * 1996-09-03 1998-04-09 Siemens Ag Meßwandler
US7808359B2 (en) * 2005-10-21 2010-10-05 Rao Dantam K Quad-gapped toroidal inductor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2521513A (en) * 1948-08-18 1950-09-05 Gen Electric Stationary induction apparatus
US4631509A (en) * 1984-04-25 1986-12-23 Allied Corporation Electrical induction apparatus with support inside casing
US4639707A (en) * 1985-03-20 1987-01-27 Allied Corporation Transformer with toroidal magnetic core

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2521513A (en) * 1948-08-18 1950-09-05 Gen Electric Stationary induction apparatus
US4631509A (en) * 1984-04-25 1986-12-23 Allied Corporation Electrical induction apparatus with support inside casing
US4639707A (en) * 1985-03-20 1987-01-27 Allied Corporation Transformer with toroidal magnetic core

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19635749A1 (de) * 1996-09-03 1998-04-09 Siemens Ag Meßwandler
DE19635749C2 (de) * 1996-09-03 1999-05-06 Siemens Ag Meßwandler
US7808359B2 (en) * 2005-10-21 2010-10-05 Rao Dantam K Quad-gapped toroidal inductor

Also Published As

Publication number Publication date
AU1268292A (en) 1992-09-15

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