Inductor devices – Core forms casing
Patent
1998-08-14
2000-06-13
Kozma, Thomas J.
Inductor devices
Core forms casing
29605, 29606, 336212, 336213, H01F 2725, H01F 2730, H01F 4102
Patent
active
060754303
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention relates to an inductive component that includes a magnetic core, coil and yoke.
DESCRIPTION OF THE BACKGROUND ART
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.
SUMMARY OF THE INVENTION
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.
One of the advantages afforded by the invention is that it provides large and controllable transition areas for the magnetic flux, while minimizing the influence of the stray air gaps at the same time. The invention also enables flexible and inexpensive transformers and inductors to be constructed with the aid of available winding techniques, with which most existing production equipment and assembling equipment can be used. Robotized manufacturing processes will, of course, be the next stage in the production of such products.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1a,b,c are perspective views of one embodiment. FIG. 1d illustrates a variant of this embodiment.
FIGS. 2a,b,c, are perspective views of another embodiment.
FIGS; 3a,b,c, are perspective views of a third embodiment.
DESCRIPTION OF PREFERRED EMBODIMENTS
FIGS. 1a,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, 9. 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.
Several inductive components wound in this way can be placed in side-by-side relationship. Alternatively, a common yoke 7' may be wound around two or more magnet cores 1 as illustrated in FIG. 1d. 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 FIGS. 2a,b,c can be used when desiring several magnet cores. In this case, 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. In this case, 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
REFERENCES:
patent: 2142066 (1938-12-01), Eppelsheimer
patent: 3153214 (1964-10-01), Brutt et al.
patent: 5092027 (1992-03-01), Denner
Kozma Thomas J.
Telefonaktiebolaget LM Ericsson
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