Combined Bonded Rotor for DC Motors With Different Magnetic Materials and Field Areas

Schliesch, Thomas; Hagemann, Birger; Hartnuss, H.; Poehlau, F.; Steingroever, D.; Drummer, Dietmar

doi:10.1109/tmag.2004.832280

Cited by 8 publications

(3 citation statements)

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“…4, 2011, pp. 219-223 Improving the stability of magnetic fillers in plastics during processing A. Gardocki 1 polymer-bonded permanent magnets. The magnetic rotor was manufactured by injection moulding in a single processing step and has three integrated magnetic tracks [1].…”

Section: Application and Production Of Magnetic Materialsmentioning

confidence: 99%

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Improving the Stability of Magnetic Fillers in Plastics during Processing

Gardocki¹,

Drummer²,

Schmachtenberg

2011

International Polymer Science and Technology

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Polymer-bonded permanent magnets can be costeffectively produced by injection moulding of polymers with magnetic fillers. Rare-earth fillers (RE) such as NdFeB or SmCo have substantially better magnetic properties as compared with other permanent magnetic fillers. Nevertheless, they are highly reactive and susceptible to oxidation, and this leads to polymer degradation and filler oxidation during processing. This paper considers two different approaches to improving the stability of rare earth-filled compounds during processing: inert processing and filler coating.

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Section: Application and Production Of Magnetic Materialsmentioning

confidence: 99%

“…Polymer-bonded magnetic rotor comprising two different magnetic compounds with three integrated magnetic tracks (source: BMBF joint research project, "Mechatronik"[1])…”

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confidence: 99%

Improving the Stability of Magnetic Fillers in Plastics during Processing

Gardocki¹,

Drummer²,

Schmachtenberg

2011

International Polymer Science and Technology

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“…Common filler contents are between 50 and 65% [21], common filler materials can be oxide ceramics (e.g., strontium ferrite (SrFeO)), or rare earth material (e.g., neodymium iron boron (NdFeB)) [17]. The magnetic properties of pole-oriented injection molded parts can be predicted using magnetostatic simulation models [20,22,23].…”

Section: Introductionmentioning

confidence: 99%

Variation of the Pole Length in Pole-Oriented Bonded Rings due to the Location and Number of Injection Points

Kurth

Drummer

2017

Journal of Polymers

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Polymer bonded magnets are compounds consisting of a polymer matrix with embedded hard magnetic filler particles. These materials are mainly used in applications in actor or sensor technology. One example is the application as multipolar encoder wheel in magnetic sensors. Depending on the application different requirements have to be fulfilled, such as a high pole length accuracy and repeatability. This investigation deals with the production of multipolar rings in the injection molding process for sensor applications and influences of the design of the gating system on the pole length accuracy. It is shown that the number of injection points and developing weld lines, as well as the positioning of the injection points, has a major influence on the magnetization characteristics of the molded rings. In general, a positioning of injection points and weld lines in the pole pitch and higher number of injection points lead to rings with a high reproduction accuracy of the pole length of the mold.

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Injection molded permanent magnets

Schliesch

2022

Modern Permanent Magnets

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Combined Bonded Rotor for DC Motors With Different Magnetic Materials and Field Areas

Cited by 8 publications

References 0 publications

Improving the Stability of Magnetic Fillers in Plastics during Processing

Improving the Stability of Magnetic Fillers in Plastics during Processing

Variation of the Pole Length in Pole-Oriented Bonded Rings due to the Location and Number of Injection Points

Injection molded permanent magnets

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