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Injection molding of multipolar, plastic-bonded permanent magnets

The addition of hard-magnetic fillers into the plastic matrix enables the production of plastic-bonded magnets. Due to many procedural advantages, e. g. during injection moulding, plastic-bonded magnets are used in drive and sensor applications.

The resulting, magnetic properties of the moulded magnets depend highly on the orientation of the fillers through a magnetic field in its magnetically preferred direction. It exist a complex dependency in between material specific, geometrical and procedural parameters on the filler orientation and therefore on the magnetic properties of the moulded magnet.

Investigations have been done on the injection moulding of pole-oriented plastic-bonded magnets with multi-polar structure along the whole processing chain regarding to the mould design, the geometry of the magnet and the processing parameters. An extended processing model could be derived, which gives the user of this technology a basic understanding of the process and allows a conclusion of procedural guidelines. It could be shown that adjusted processing technology is especially necessary for thin geometries of the magnet and small widths of the poles. The magneto-static simulation has been investigated regarding its limits for the prediction of the resulting magnetic part properties of multi-polar magnets. A magnetic mould design before the mould building using this method of calculation is recommended under consideration of its limits.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Stefan Eimeke

Stefan Eimeke
Lehrstuhl für Kunststofftechnik (LKT)
Universität Erlangen-Nürnberg

Information

Free keywords: Permanent magnet, plastic-bonded magnet, highly-filled plastics, filler, magnet, compounding, multipole, magnetic field, injection molding
Institute / chair: Technische Fakultät der Universität Erlangen-Nürnberg
Language: German
Technical consultant for expert services: Prof. em. Dr.-Ing. Dr. h.c. Gottfried W. Ehrenstein, Prof. Dr.-Ing. Ernst Schmachtenberg, Prof. Dr.-Ing. Michael Gehde
Publication year: 2008
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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