DE2652171A1 - CONTROL UNIT ETC. WITH E- AND I-SHAPED CORE PLATES - Google Patents

Description

PATENT Attorney DIPL.-ING. J. WENZEL 7 STUTTGART HAUPTMANNSREUTE 46 Bertos AG. Glarus (Switzerland)

Ballast and the like. With E- and I-shaped Core sheets

The invention relates to a ballast and the like with substantially waste-free punched E- and I-shaped Core sheets, which are surrounded by a two-part jacket, so that each E- and I-shaped core sheet of one Sheath is surrounded, the shell part of the E-shaped core sheets overlapping the shell part of the I-shaped core sheets according to patent application P 23 44 4o3.3.

Such a ballast and the like is already known, it can also be a choke coil or a transformer, for example for the starterless one Operation of fluorescent lamps or autotransformers, the dimensions of which are standardized. It is provided that punching out the I-shaped core sheets from two adjacent E-shaped core sheets without waste, whereby the inner punchings of two E-shaped sheets result in two I-shaped sheets. This means, for example, a saving on active material, i.e. on copper and on core sheet material possible by enlarging the inner core,

809821/0126

PATENT ADVOCATE Dl PL.-1 NG. J. WENZEL 7 STUTTGART HAUPTMANNSREUTE

because as a result, fewer turns per winding are required for the same specific material stress. For this purpose, a certain geometry of the dimensions 'of the windings and the core sheets was proposed (DT-OS 23 44 iJ03') - ■■■■ ·

It is also known that two E-shaped core sheets lying one inside the other are made from a sheet metal strip of a corresponding width in the ratio of the area of the core sheet to the area of the winding sheet of 1: 1 without waste to punch. This has the disadvantage that the ratio of the area of the core sheet to the area of the winding sheet cannot be chosen arbitrarily.

The invention is based on the object of improving the ballast and the like of the type mentioned at the outset in such a way that that the cross-section ratio mentioned can assume any size.

The solution to this problem by the invention consists in that E-shaped core sheets punched separately in a known manner without waste and separated without waste Stamped I-shaped core sheets are put together to form a common ballast core arrangement.

80 982 1/0126

PATENT Attorney DIPL.-ING. J. WENZEL 7 STUTTGART HAU PTMAN NS REUTE 46

2 & S2171

In this way, any desired ratio of the area of the core lamination to the area of the winding lamination can be achieved which is practically required in numerous cases.

In a further embodiment of the invention it is provided that the I-shaped Kernbledhe at their ends with small Projections are provided in the transverse direction with respect to their longitudinal extent, which are opposite to corresponding recesses lie.

This results in the air gap between the middle part of the E-shaped core sheet and the middle part of the I-shaped core sheet easily, because the I-shaped core sheet is set back by the projection relative to the central part lies, so that the extent of these "projections" determines the size of the air gap at the same time.

The invention does result in small cavities between the jacket and the I-shaped core sheet on the outside Ends of the core sheets, however, this results in a surprising result. Way no disadvantage.

Further advantages and details of the invention emerge from the following description of some of the invention Embodiments with reference to the drawing. In this show:

809821/0126 "*"

PATENT Attorney DlPL-ING. J. WENZEL 7 STUTTGART HAUPTMANNSREUTE 46

Fig. 1 is an end view of a ballast, a choke coil or a transformer according to the prior art Technology for comparison;

2 shows a die cut for the production of the core sheets according to FIG. 1;

FIG. 3 shows an end view like FIG. 1, but of one according to the invention Embodimentj

FIG. 4 shows an end view like FIG. 3 on a further i. Embodiment according to the invention;

Fig. 5 is a die cut for the production of E-shaped core sheets known type, as for the embodiments according to the invention 3 and 4 are required;

6 punch cuts according to the invention for the I-shaped core sheets for producing the embodiment according to FIGS. 3 and

7 shows a punched section with I-shaped core sheets for the embodiment according to FIG. 4.

80982 1/0 126

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PATENT Attorney DIPL.-ING. J. WENZEL 7 STUTTGART HAUPTMANNSREUTE 46

Pig. 1 shows the E-shaped core sheets 1, which are surrounded by a jacket 3, on which the I-shaped core sheets 2, which are surrounded by the jacket 4, rest at the bottom. The total width including the jacket is, while the width of only the E-shaped core sheet is designated with a. As you can see, the air gap Ik results from the fact that the I-shaped core sheets 2 have projections 15 a and 15 b at their ends. This is already known, but can only be carried out without waste if the ratio of the core area fk to the winding area fw is designed as indicated in this exemplary embodiment. Pk is equal to .a / 3 and fw a / 6, ie the ratio fk / fw is approximately equal to 2: 1. This can only be achieved with a relatively complicated die cut, as shown in FIG. As you can see, two E-shaped core sheets and two I-shaped core sheets 2 have to be punched out simultaneously on a strip of corresponding width in the manner shown.

Fig. 5 shows a further known, very much simpler punching cut for the E-shaped core sheets that are used in the inventive Devices according to Fig. 3 and 4 are installed

809821/0126

PATENT Attorney DlPL-ING. J. WENZEL 7 STUTTGART HAUPTMANNSREUTE

The device according to Fig. 4 shows a stray field transformer, in which the I-shaped core sheets according to FIG. 7 with a rectangular cross section are used. They didn't hatch designated areas approximately in the middle left and right represent a stray field. This general type of Stray field transformers are usually made without an air gap.

In the case of FIG. 3, the ratio of the area of the core material to the area of the winding material is fk / fw = 1. If an air gap lh is to be installed here, it is provided according to the invention according to FIG. 6 that not only projections 15 a and 15 b are arranged at the ends of the I-shaped core sheets 2, but there are also recesses 16 a, 16 b arranged opposite the projections, in order to enable dm '· I-shaped core sheets with the length 1 = a-2s, even in the case of a completely loose punching.

Fig. 3 shows that this results in the cavities 17 a and 17 b result on the outer edges of the I-shaped core laminations 2 lie. Surprisingly, this does not result in any disadvantages.

809821/0126

L e r s e i f e

Claims (3)

/ b'Jji / W / be PATENT Attorney DIPL-ING. J. WENZEL 7 STUTTGART HAUPTMANNSREUTE PATENT CLAIMS Pre-storage devices and the like. With essentially no waste stamped E- and I-shaped core sheets, which are surrounded with a two-part jacket, so that each E- and I-shaped The core sheet is surrounded by a shell, the shell part of the E-shaped core sheets being the shell part the I-shaped core sheets overlaps, according to patent application P 23 44 403.3, characterized by the fact that in E-shaped core sheets punched separately without waste in a known manner (FIG. 5) and punched separately without waste I-shaped core sheets (Fig. 6, Fig. 7) together to form a common reserve core arrangement (Fig. 3, Fig. 4) are set. 2. Ballast according to claim 1, characterized in that that the I-shaped core sheets (2) at their ends with small projections (15a, 15b) .in the transverse direction with respect to their Longitudinal extension are provided, which are opposite to corresponding recesses (I6a, l6b). 3. Ballast according to claim 1, characterized in that the length of the core sheets (2] L = a-2 s, wherein a is the total width of the E-shaped core sheets and s is the wall thickness of the jacket material. 809 8 21/0126 ORIGINAL INSPECTED