Evaluation of magnetic forces in permanent magnets

Santiago Sanz; Luis García-Tabarés; Iván Moya; Diego Obradors; Fernando Toral

doi:10.1109/TASC.2009.2038933

Evaluation of magnetic forces in permanent magnets

Santiago Sanz^*
, Luis García-Tabarés
, Iván Moya
, Diego Obradors
, Fernando Toral

^*Corresponding author for this work

CIEMAT

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

The numerical evaluation of magnetic forces exerted by permanent magnets is usually performed by two methods, the integration of the Maxwell stress tensor or by means of virtual displacements and energy balance. In this paper, we will review previous works on this subject, where controversy exists due to the sign of the magnetic energy stored in the magnet itself. We will check the theoretical work in the matter with numerical results from a number of FEM codes, as Ansys, Opera and Quickfield. Several examples of application will be provided. One of those will be the particular case of a phase shifter under development for the XFEL (European X-Ray Free Electron Laser) project. Its purpose is to adjust the phase between two consecutive undulator segments. The magnetic field is obtained in this device through a Halbach hybrid configuration with Nd-Fe-B permanent magnets and Fe-Co poles.

Original language	English
Article number	5411931
Pages (from-to)	846-850
Number of pages	5
Journal	IEEE Transactions on Applied Superconductivity
Volume	20
Issue number	3
DOIs	https://doi.org/10.1109/TASC.2009.2038933
Publication status	Published - Jun 2010
Externally published	Yes

Keywords

Electromagnetic forces
Finite element method
Permanent magnets
Phase shifters

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10.1109/TASC.2009.2038933

Cite this

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title = "Evaluation of magnetic forces in permanent magnets",

abstract = "The numerical evaluation of magnetic forces exerted by permanent magnets is usually performed by two methods, the integration of the Maxwell stress tensor or by means of virtual displacements and energy balance. In this paper, we will review previous works on this subject, where controversy exists due to the sign of the magnetic energy stored in the magnet itself. We will check the theoretical work in the matter with numerical results from a number of FEM codes, as Ansys, Opera and Quickfield. Several examples of application will be provided. One of those will be the particular case of a phase shifter under development for the XFEL (European X-Ray Free Electron Laser) project. Its purpose is to adjust the phase between two consecutive undulator segments. The magnetic field is obtained in this device through a Halbach hybrid configuration with Nd-Fe-B permanent magnets and Fe-Co poles.",

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T1 - Evaluation of magnetic forces in permanent magnets

AU - Sanz, Santiago

AU - García-Tabarés, Luis

AU - Moya, Iván

AU - Obradors, Diego

AU - Toral, Fernando

PY - 2010/6

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AB - The numerical evaluation of magnetic forces exerted by permanent magnets is usually performed by two methods, the integration of the Maxwell stress tensor or by means of virtual displacements and energy balance. In this paper, we will review previous works on this subject, where controversy exists due to the sign of the magnetic energy stored in the magnet itself. We will check the theoretical work in the matter with numerical results from a number of FEM codes, as Ansys, Opera and Quickfield. Several examples of application will be provided. One of those will be the particular case of a phase shifter under development for the XFEL (European X-Ray Free Electron Laser) project. Its purpose is to adjust the phase between two consecutive undulator segments. The magnetic field is obtained in this device through a Halbach hybrid configuration with Nd-Fe-B permanent magnets and Fe-Co poles.

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KW - Finite element method

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KW - Phase shifters

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JF - IEEE Transactions on Applied Superconductivity

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ER -

Evaluation of magnetic forces in permanent magnets

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Keywords

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