Detailed analysis of permanent magnets by means of free field measurements

Husstedt, Hendrik

doi:10.1063/1.4852096

Cited by 3 publications

(5 citation statements)

References 2 publications

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“…For evaluating the measurements with the MCMM, the permeability of the PM has to be assumed. However, as stated in [2], the permeability has a distinct influence on the amplitude of the stray field, which can be confirmed by the following experiment. First, the measurements taken by the MCMM are processed with the permeability assumed as nominal, and second, the permeability resulting from the approach presented is used to set up a new system matrix for solving the inverse problem for the MCMM according to [2].…”

Section: B Verification By Reference Measurementssupporting

confidence: 81%

“…The verification by another measurement procedure, the MCMM [2], demonstrated the importance of the identification of the permeability, which especially affects the stray field of a PM in air.…”

Section: Discussionmentioning

confidence: 98%

“…For this purpose, the magnetic and coordinate measuring machine (MCMM) [2] is chosen. For evaluating the measurements with the MCMM, the permeability of the PM has to be assumed.…”

Section: B Verification By Reference Measurementsmentioning

confidence: 99%

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A Method for Parameter Identification of Thin Permanent Magnets at Higher Frequency and Temperature Ranges

Perchtold

Husstedt²

2015

IEEE Trans. Magn.

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In this paper, a method is presented to determine the main characteristic parameters of permanent magnets, i.e., the remanence and the permeability in the linear operating range. Since the samples are thin in the direction of magnetization and since they have also been characterized at higher excitation frequencies, a standard method is not applicable. Therefore, we present an applicationoriented approach, where the linear range can be determined up to higher frequencies and which covers the nominal operating temperature range of the samples. The permeability is measured directly, whereas the remanence is determined by utilizing a magnetic equivalent circuit. , as a Full Professor of Measurement and Actuator Technology. He has authored or co-authored a book, five book chapters, and more than 60 peer-reviewed journal publications. His current research interests include computer-aided engineering of sensors and actuators with a special emphasis on numerical simulation techniques. Prof. Kaltenbacher is a member of the IEEE

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Section: B Verification By Reference Measurementssupporting

confidence: 81%

Section: Discussionmentioning

confidence: 98%

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A Method for Parameter Identification of Thin Permanent Magnets at Higher Frequency and Temperature Ranges

Perchtold

Husstedt²

2015

IEEE Trans. Magn.

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“…The mechanism of coercivity is an enduring topic of magnetism, [17,[29][30][31][32][33][34][35][36][37][38][39][40][41][42][43] which is especially true because a permanent magnet characterized by a high coercivity is considered. The Stoner-Wohlfarth model (SW model) [44] is the most promising time-independent model to date.…”

Section: Coherent Rotation and Domain Wall Motionmentioning

confidence: 99%

Coercivity mechanisms in nanostructured permanent magnets*

Zhao¹,

Zhao²,

Shen³

et al. 2019

Chinese Phys. B

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Coercivity mechanism in permanent magnets has been debated for many years. In this paper, various models of the coercivity mechanism are classified and re-examined by the comparison and contrast. Coherent rotation and curling models can reveal the underlying reversal mechanism clearly based on isolated grains with elliptic shapes. By contrast, the numerical methods consider inter-grain interactions while simulating the evolution of the spins and hysteresis loops with complicated shapes. However, an exact simulation of magnetic reversal in permanent nanomagnets requires many meshes to mimic the thin domain wall well. Nucleation and pinning are the two main coercivity mechanisms in permanent magnets. The former signifies the beginning of the magnetic reversal, whilst the latter completes it. Recently, it is proposed that the large difference between the intrinsic magnetic properties of the nucleation centers and those of the main phase can result in a large pinning field (self-pinning), which has the attributes of both traditional nucleation and pinning. Such a pinning explains the experimental data of permanent magnets very well, including the enhancement of the coercivity by the grain boundary pinning.

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“…The identification of (permanent) magnetic materials has e.g. been successfully applied for reconstructing the state of magnetic rollers used in copy machines [6], magnetically biased chokes [7], or even for the magnetic anomaly created by ferromagnetic ships [8].…”

Section: Introductionmentioning

confidence: 99%

Solving Large-Scale Inverse Magnetostatic Problems using the Adjoint Method

Bruckner

Abert

Wautischer

et al. 2017

Sci Rep

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An efficient algorithm for the reconstruction of the magnetization state within magnetic components is presented. The occurring inverse magnetostatic problem is solved by means of an adjoint approach, based on the Fredkin-Koehler method for the solution of the forward problem. Due to the use of hybrid FEM-BEM coupling combined with matrix compression techniques the resulting algorithm is well suited for large-scale problems. Furthermore the reconstruction of the magnetization state within a permanent magnet as well as an optimal design application are demonstrated.

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Detailed analysis of permanent magnets by means of free field measurements

Cited by 3 publications

References 2 publications

A Method for Parameter Identification of Thin Permanent Magnets at Higher Frequency and Temperature Ranges

A Method for Parameter Identification of Thin Permanent Magnets at Higher Frequency and Temperature Ranges

Coercivity mechanisms in nanostructured permanent magnets*

Solving Large-Scale Inverse Magnetostatic Problems using the Adjoint Method

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