3D-FEM-Simulation of Magnetic Shape Memory Actuators
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1 3D-FEM-Simulation of Magnetic Shape Memory Actuators M.Schautzgy 1/2, U.Kosiedowski² and T.Schiepp 1 1 ETO MAGNETIC GmbH Hardtring Stockach Germany 2 HTWG Konstanz Brauneggerstraße Konstanz Germany Aktoren und Sensoren ETO MAGNETIC GmbH Hardtring Stockach Tel.: Fax:
2 Content Short Overview Magnetic Shape Memory Alloys as a Smart Material Magnetic Shape Memory Effect Magnetomechanical Behaviour of Magnetic Shape Memory Alloys Iterative Magnetostatic FEM Model Stress Based Simulation Simulation Results Conclusion and Outlook Präsentationsname.pptx / Kurzzeichen Print:
3 External Force Short Introduction (MSM) Schematic illustration U Magnetic flux Präsentationsname.pptx / Kurzzeichen Print:
4 Magnetic Shape Memory Effect Magnetic Shape Memory Technology Background Magnetic Field Conventional soft magnetic material Magnetic Shape Memory no strain * large strain * Magnetostriction may occur, but is neglected here. Präsentationsname.pptx / Kurzzeichen Print:
5 15 mm Short Introduction (MSM) From macro-twins to nano-twins Source: Source: Fähler, Boise 2013 Präsentationsname.pptx / Kurzzeichen Print:
6 MSM Production: Process Steps MSM Material Production Single crystalline MAGN SHAPE material (Ni-Mn-Ga) Präsentationsname.pptx / Kurzzeichen Print:
7 F High Work Output Ratio MSM-Werkstoff H 0 Output > 85% Effective magnetic work H = 0 H Mechanical work for resetting Präsentationsname.pptx / Kurzzeichen Print:
8 Magnetic Flux Density [B] Simulation of Magnetic Shape Memory Actuators Implementation of magnetomechanical behaviour in 3D-FEM-Model All Slices Magnetic slices switch hard Field easy induced 1.6 B(H) MSM Alloy Iron Core Iron Core B(H) hard B(H) easy Magnetic Field H [A/m] Präsentationsname.pptx / Kurzzeichen Print:
9 Simulation of Magnetic Shape Memory Actuators Stress Based Approach In Magnetic Shape Memory material the magnetic filed generates a magnetomechanical stress that leads to a shape change under this condition: F H F F H H Schiepp et al., IEEE Trans. Magn. 50, , 2014 Präsentationsname.pptx / Kurzzeichen Print:
10 2D Simulation with FEMM Simulation results Current 01 A Präsentationsname.pptx / Kurzzeichen Print:
11 3D Simulation with COMSOL The simulated Actuator Fast Switching Spring Actuator Spring actuator Actuator size mm³ MSM size mm³ Cu weight 14 g Current 3 A Stroke 0.7 mm Force 7 N Switching time 1.6 ms Präsentationsname.pptx / Kurzzeichen Print:
12 Stroke (mm) Simulation of Magnetic Shape Memory Actuators The simulated Actuator Fast Switching Spring Actuator 3D-FEM-Plots Current-Stroke Curve MSM Current (A) First 3D simulation with this Model: Magneto-Static simulation Subdivided in 5 elements Each with individual twinning stress Magneto-mechanical behaviour is calculated separately Präsentationsname.pptx / Kurzzeichen Print:
13 Stroke (mm) Simulation of Magnetic Shape Memory Actuators The simulated Actuator Fast Switching Spring Actuator 3D-FEM-Plots Current-Stroke Curve MSM Current (A) Second 3D simulation more Elements: Magneto-Static simulation Subdivided in 15 Elements Each with individual twinning stress Magneto-mechanical behaviour is calculated separately Präsentationsname.pptx / Kurzzeichen Print:
14 Simulation of Magnetic Shape Memory Actuators Conclusion and Outlook 3D-FEM simulation results are presented that demonstrate a possibility of modeling MSM actuators Taking into account the anisotropic behavior of MSM materials Appropriate representation of the twin structure The flux density within the magnetic circuit of an MSM actuator is analyzed using COMSOL Multiphysics The results agree with previous 2D- Fem simulations as well as measurements To reduce the divergence between the 3D-FEM-simulations results and the measurements, a increased amount of slices will be necessary Therefore an automated and adaptive evaluating process is indispensable large strain Präsentationsname.pptx / Kurzzeichen Print:
15 Thank you for your attention, do have any questions? Präsentationsname.pptx / Kurzzeichen Print:
3D-FEM-Simulation of Magnetic Shape Memory Actuators
3D-FEM-Simulation of Magnetic Shape Memory Actuators M.Schautzgy* 1/2, U.Kosiedowski² and T.Schiepp 1 1 ETO MAGNETIC GmbH, Hardtring 8, 78333 Stockach, Germany 2 University of Applied Science Konstanz,
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NEPTUNE -code: KAUVG11ONC Prerequisites:... Knowledge description:
Subject name: Electrical Machines Credits: 9 Requirement : Course director: Dr. Vajda István Position: Assessment and verification procedures: NEPTUNE -code: KAUVG11ONC Prerequisites:... Number of hours:
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