• Additive Manufactured and Topology Optimized Passive Shimming Elements for Permanent Magnetic Systems

    • Christian Huber
      Physics of Functional Materials, Faculty of Physics, University of Vienna
    • Michael Goertler
      Institute for Surface Technologies and Photonics, Joanneum Research Forschungsgesellschaft GmbH
    • Claas Abert
      Physics of Functional Materials, Faculty of Physics, University of Vienna
    • Florian Bruckner
      Physics of Functional Materials, Faculty of Physics, University of Vienna
    • Martin Groenefeld
      Magnetfabrik Bonn GmbH
    • Iulian Teliban
      Magnetfabrik Bonn GmbH
    • Dieter Suess
      Physics of Functional Materials, Faculty of Physics, University of Vienna
  • A method to create a highly homogeneous magnetic field by applying topology optimized, additively manufactured passive shimming elements is investigated. The topology optimization algorithm can calculate a suitable permanent and nonlinear soft magnetic design that fulfills the desired field properties. The permanent magnetic particles are bonded in a polyamide matrix and they are manufactured with a low-cost, end-user 3D printer. Stray field measurements and an inverse stray field simulation framework can determine printing and magnetization errors. The customized shimming elements are manufactured by a selective melting process which produces completely dense soft magnetic metal parts. The methodology is demonstrated on a simple example of two axial symmetric cylindrical magnets, which generates a high inhomogeneous magnetic field. In this case, the maximum magnetic field density is 25 mT and the the homogeneity can be increased by a factor of 35 or down to 6‰. Simulation and measurement results point out a good conformity. Additional topology optimizations of more than one shimming element layer show the opportunity to make the manufactured magnetic system even more homogeneous.

  • PDF

  • http://phaidra.univie.ac.at/o:931171

  • Article

  • Published Version

  • Scientific Reports

  • 2018

  • 8

  • Springer Nature America, Inc

  • English

  • Open access

  • CC BY Attribution 4.0 International
    © The Author(s) 2018

  • 2045-2322

  • Engineering; Techniques and instrumentation