Classifications

• • 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
• • 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
  • Y10T29/49071—Electromagnet, transformer or inductor by winding or coiling
• • 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

Definitions

• the present invention relates to an inductive component that includes a magnetic core, coil and yoke.
• Magnet cores are manufactured in many different ways.
• British Patent Specification 563517 teaches a method in which a strip is wound around a cylinder, whereafter the cylinder then is removed and the coiled strip then is compressed.
• a yoke is formed by winding another strip to a rectangular shape, whereafter the compressed coil is inserted into the yoke.
• Sintered or punched cores and yokes are examples of other variants.
• the evenness of the transition areas between the magnetic elements varies markedly, and these areas must therefore be ground or polished to small tolerances at subsequent high costs.
• Toroidally wound strip is another available alternative, although with limited use and requiring a complicated winding procedure.
• the problem relating to small and varying transition areas for the magnetic flux is solved in accordance with the present invention by using a magnet core in the shape of a dumbbell.
• the magnet core includes a cylinder comprised of wide strip wound around non-magnetic material, and two flanges wound from two narrower strips edge-to-edge with the planar outer ends of the cylinder.
• a coil is wound around the centre part of the cylinder, between the flanges.
• a yoke is wound around the magnet core, so that magnetic flux can return.
• Figs. la,b,c are perspective views of one embodiment.
• Fig. id illustrates a variant of this embodiment.
• Figs. 2a,b,c,d are perspective views of another embodiment.
• Figs. 3a,b,c,d are perspective views of a third embodiment.
• FIGS la,b,c illustrate one embodiment of the invention.
• a dumbbell-shaped magnet core 1 is wound from three strips of ferromagnetic, amorphous material. This type of strip material is used because it has good magnetic properties and results in low losses.
• a wide strip is first wound around non-magnetic material 5 such as to produce a cylinder 2 that has planar outer ends 8, S. Two narrower strips are then wound edge-to- edge with the outer ends 8, 9, to provide two flanges 3, 4.
• the coil 6 is then wound around the centre part of the cylinder 2 between the flanges 3, 4 a desired number of turns. Finally, a strip is wound around the magnet core in the longitudinal direction thereof and over the outer ends 8, 9, to form a rectangular yoke 7 for return of the magnetic flux.
• the strip used to fabricate the yoke 7 is also comprised of ferromagnetic, amorphous material.
• a common yoke 7' may be wound around two or more magnet cores 1 as illustrated in Figure Id.
• the width of the strip from which the yoke 7' is wound will be adapted to the number of magnet cores concerned.
• the alternatives afforded by the embodiment illustrated in Figures 2a,b,c can be used when desiring several magnet cores.
• two magnet cores 1 and respective coils 6 can be fabricated in accordance with the aforegoing.
• the common yoke 10 will have a different configuration than that in the first embodiment, but will be made of the same material.
• the yoke 10 has an oval configuration and is comprised of strip material whose width is equal to the width of the strip material used to wind the cylinder 2. The yoke 10 is then wound with strip material disposed edge-to-edge with the outer ends 8, 9.
• magnet cores 1 may also be used in this case.
• the yoke 10 when used solely in respect of one magnet core 1, it is necessary to provide a hole in the casing for receiving the coil connecting wires. This hole should be made as small as possible, so as to minimize disturbance of the magnetic flux.
• the first embodiment is thus more advantageous when wishing to use one magnet core.
• Figures 3a,b,c illustrate a third embodiment in which the coil 6 is wound commonly around more than one cylinder 2.
• This variant can be combined with both types of yokes 7, 10.
• the non-magnetic material may be copper or plastic material for instance, the only criterion being that the material is non ⁇ magnetic.
• the material, or substance, used may be air, which is after all non-magnetic.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Coils Or Transformers For Communication (AREA)
• Reciprocating, Oscillating Or Vibrating Motors (AREA)
• Iron Core Of Rotating Electric Machines (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20400348

Family Applications (1)

Country Status (7)

Cited By (1)

Families Citing this family (3)

Citations (2)

Family Cites Families (2)

• 1995
  • 1995-11-24 SE SE9504204A patent/SE9504204L/ not_active IP Right Cessation
• 1996
  • 1996-11-22 WO PCT/SE1996/001526 patent/WO1997019458A1/en active IP Right Grant
  • 1996-11-22 AU AU77158/96A patent/AU7715896A/en not_active Abandoned
  • 1996-11-22 DE DE69607764T patent/DE69607764D1/de not_active Expired - Lifetime
  • 1996-11-22 EP EP96940218A patent/EP0862783B1/en not_active Expired - Lifetime
  • 1996-11-22 JP JP9519664A patent/JP2000501236A/ja active Pending
  • 1996-11-22 US US09/068,773 patent/US6075430A/en not_active Expired - Fee Related

Patent Citations (2)

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