DE4301771C2 - Magnetizing device for permanent magnet foils with stripe-shaped poles - Google Patents

Description

The invention relates to magnetizing devices for Permanent magnet foils with stripe-shaped poles. Such Films are required for a variety of applications, for Example of billboards, for plates in material store or as noise-absorbing foils at the metal processing processing, especially in the shaping of sheet metal worked objects.

Such films consist of a flexible art substance mixed with a permanent magnet powder, e.g. B. with a powder of hard ferrite or from a high coercive alloy such as AlNiCo or one with Rare earths (e.g. neodymium iron boron, samarium cobalt).

An important application of such films is noise reduction Parts in the automobile that from the body reduce touching noises. These slides come with provided with an adhesive layer and adhere to the inside Body parts that then run through an oven, whereby  the adhesive becomes firm and the foils permanently with the Body sheet to be connected. These foils exist mostly from a mixture of bitumen with hard ferrite powder.

The invention solves the problem continuous magnetizing device to create flexible permanent magnet foils, the one with the lowest possible electrical energy the full magnetic saturation of these foils reached.

Known magnetizing devices for such films are flat plates in the desired pole arrangement corresponding current conductors are embedded (JP 58-188 107 (A)). After hanging up the film on such a magnetizing plate becomes a high one Current pulse sent through the conductor and therefore lead generated magnetic poles on the film. Are the electricity ladder meandering and parallel to each other, this is how e.g. B. a magnetization of the film with each other parallel pole strips.

These plate-shaped magnetizers exist generally made of non-magnetic material, e.g. B. from Glass fiber plastic, but require a very high Current surge, which is required to saturate the magnetic foil magnetic field. Would they be made of soft ma magnetic steel, the foil would remain on them stick and would be difficult to take off.  

Other known magnetizers are rollers that from round iron disks with a duration in between magnetic plates are layered (EP 0 218 044 A1). You keep yours Magnetization constantly and are therefore difficult keep clean: magnetic parts stick to them.

Finally, magnetizing rolls are also known, which in their surface is annular coaxial, mutually have parallel conductors. With them prepares Power supply to the individual conductor rings or ring group difficulties and it must be z. B. for each conductor group a special power supply via one col lecturer pair.

JP 1-128 506 (A) is a coaxial arrangement of conductors on a cylindrical body described. However, this is only used for generating of magnetic poles on the inside of tubular Permanent magnets.

The problem underlying the invention is solved by the Features listed claim 1 solved.

Further refinements of the invention result from the subclaims.

In Fig. 1 an embodiment of the invention is shown. On an axis 1 of the roller body 2 is fixed, which preferably consists of thin disks of an electrical sheet. In it, axially parallel grooves are incorporated, in which insulated current conductors 3 are connected in series in a meandering shape.

The current conductors are grouped into 4 groups. The two ends of each group are connected to collector segments 4 , which are arranged on the end face on a roller end. For example, 8 segments are provided for 4 conductor groups.

Collector brushes 5 , which are connected to the poles 6 (+ and -) of a high-current pulse device, grind on the segments.

When turning the roller, there is only one conductor group at a time connected to the pulse device so that its energy is on a quarter of the roller surface is effective and one ent speaking high magnetic field strength for those on this Magnetic film lying in a quarter is created.

The invention transversely to the direction of movement of the ma gnizing foils lying poles result in a special safe taking with you.

Instead of 4 sectors, the roller can also be divided differently be, e.g. B. in 2, 3, 5, etc. sectors with corresponding Number of contact segments, but always with only two Collectors.  

The magnetizing pulse expediently occurs from the discharge a condenser charged to high voltage (200 to 5000 V) sators, the signals given by the rotation of the roller is triggered.

The film to be magnetized needs, as shown in Fig. 2 ge, to cover just a little more than the active angle α of the roller and is guided by 2 auxiliary rollers 7 , carried by the roller and transported on the fixed table top 8 .

Instead of the flat arrangement shown on the end face of the contact segments and collectors, these can also be arranged cylindrically on the shaft 1 in a known manner.

Claims (6)

1. Magnetizing device for permanent magnetic foils with strip-shaped poles, in the form of a roller over which the foil to be magnetized is guided in contact, characterized in that magnetizing current conductors are inset in parallel and meandering in series in groups in their surface insulated and successively by sector with a power source get connected. 2. Magnetizing device according to claim 1, characterized through contact segments connected to the roller, the each in pairs to the individual leader groups assigned. 3. Magnetizing device according to claims 1 and 2, characterized by a fixed pair of collectors brush each connecting a ladder Create the group with the pulse generator.   4. magnetizing device according to claims 1 to 3, characterized in that the magnetizing pulses of the rotating roller can be controlled. 5. magnetizing device according to claims 1 to 4, characterized in that the rotating roller transported film to be magnetized. 6. magnetizing device according to claims 1 to 5, characterized by auxiliary rollers that attach the film to the Press the rotating roller in the area where the magnetization takes place.