Fully 3D-Printed, Monolithic, Mini Magnetic Actuators for Low-Cost, Compact Systems
| Autor: | David P. Arnold, Anthony P. Taylor, Camilo Velez Cuervo, Luis Fernando Velasquez-Garcia |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Magnetic domain 9 mm caliber Mechanical Engineering Nylon 12 Center (category theory) Solenoid 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Neodymium magnet chemistry Remanence Magnet Electrical and Electronic Engineering Composite material 0210 nano-technology |
| Zdroj: | Journal of Microelectromechanical Systems. 28:481-493 |
| ISSN: | 1941-0158 1057-7157 |
| Popis: | We report the design, fabrication, and experimental characterization of the first fully 3D-printed, multi-material miniature magnetic actuators for compact systems in the literature. The actuator design integrates a bonded hard magnet made of NdFeB microparticles embedded in a Nylon 12 matrix (55% by volume) with structural and support elements made of pure Nylon 12. The device is a 10 mm-diameter, 1.2 mm wall-thick, and 9 mm tall cylindrical frame that mounts on an off-the-shelf solenoid and a 10 mm diameter, 100 $\mu \text{m}$ -thick, leak-tight membrane connected at its center to a 4 mm diameter, 4.95 mm tall hard magnet. The actuators are monolithically printed in layers as thin as $100~\mu \text{m}$ using $600~\mu \text{m}$ -wide strokes via fused filament fabrication (FFF) –a low-cost 3D printing technology capable of processing high-performance thermoplastics to create monolithic objects made of a plurality of distinctive feedstock. The average surface roughness, Young’s modulus, and hardness of the FFF-printable hard-magnetic filament were estimated at $58.55~\mu \text{m}$ , 3.59 GPa, and Shore D 71.5, respectively, while the average surface roughness, Young’s modulus, and yield strength of FFF-printed magnetic material were estimated at $5.79~\mu \text{m}$ , 2.02 GPa, and 55.99 MPa ± 4.59 MPa, respectively. Magnetic characterization of the FFF-printed NdFeB-embedded Nylon 12 feedstock demonstrates the fabrication of isotropic hard magnets with an intrinsic coercivity of ~700 kA/m, remanence of ~395 mT, and a maximum energy product of 27 kJ/ $\text{m}^{3}$ . Simulations of the stray magnetic field produced by a printed sample made of NdFeB-embedded Nylon 12 were validated using a scanning Hall probe. The vertical displacement of a miniature 3D-printed magnetic actuator was characterized with a solenoid for various coil bias voltages; a maximum displacement equal to 50 $\mu \text{m}$ was obtained with 3.1 V DC applied to the driving coil. Finite element simulations of the actuator design estimate at 2.38 MPa the maximum stress on the membrane at $50~\mu \text{m}$ actuation (i.e., below the fatigue limit of Nylon 12), and at 592.61 Hz the natural frequency of the device, which was corroborated via experiment. [2018-0288] |
| Databáze: | OpenAIRE |
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