Analysis of the geometric parameters influence in PCB fixtures for 2D multipole magnetization patterning of thin layer micro-magnets

Martinez-Muñoz, Miriam; Díez-Jiménez, Efrén; Montero, Rocío Sánchez; López-Espí, P. L.; Martinez-Rojas, Juan Antonio

doi:10.3233/jae-180121

Cited by 9 publications

(5 citation statements)

References 14 publications

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“…The 2D transient finite element model is solved using ANSYS Electronics 2019 R3 software. Similar models have been used for micro-magnetic gears analysis in [37,38]. In the transient model, rotor components are forced to spin concentrically with the stator and at a constant rotational speed.…”

Section: Electromagnetic Finite Element Model Of the Motormentioning

confidence: 99%

Scale Effects on Performance of BLDC Micromotors for Internal Biomedical Applications: A Finite Element Analysis

Villalba-Alumbreros

Moron-Alguacil

Fernández-Muñoz

et al. 2022

Journal of Medical Devices

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This paper theoretically analyses the miniaturization effects on torque, efficiency and thermal behaviour of high torque permanent magnet BLDC motors with ferromagnetic core coils for internal medical devices. Using a finite element model of a 2-phase BLDC motor, scalability laws are provided for diameters between 0.1 and 100 mm and current densities between 1 and 1000 A/mm2. Based in the impact of the cogging torque and overheating of the motor, scale dependent operational limits are calculated. Operational threshold can be determined at the point where cogging torque becomes dominating over total torque, limiting the use of traditional iron-core motors in the micro-scale. To overcome such limitation, a potential solution is to increase the current density in the windings. However, overheating of the motor limits such increase in the current density which is critical for internal medical applications. Current density limits are provided based on three representative in-body thermal scenarios: respiratory tract, body fluid and blood torrent. Maximum current densities and corresponding torque and efficiency have been obtained for different micro-motor sizes considering safe in-body operation as threshold. It is demonstrated the potential application of micro-motors in internal body environments with acceptable performance for sizes down to 0.1 mm diameter.

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Section: Electromagnetic Finite Element Model Of the Motormentioning

confidence: 99%

Scale Effects on Performance of BLDC Micromotors for Internal Biomedical Applications: A Finite Element Analysis

Villalba-Alumbreros

Moron-Alguacil

Fernández-Muñoz

et al. 2022

Journal of Medical Devices

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“…En los MEMS se requieren subsistemas y componentes capaces de generar o recibir señales electromagnéticas. En el caso de los actuadores electromagnéticos, son necesarios elementos inductores capaces de generar el campo magnético necesario para actuar mecánicamente sobre imanes permanentes de alta calidad [19]- [20] , que han demostrado ser reducibles a la escala microscópica [21]- [22]. En el caso de los transductores electromagnéticos, es necesario emitir y recibir señales de radiofrecuencia a través de antenas con la suficiente potencia y ganancia, y bajo coeficiente de reflexión.…”

Section: Motivaciónunclassified

Desarrollo de una máquina bobinadora semiautomática para la microfabricación de bobinados, antenas y solenoides micrométricos

2022

Congreso Iberoamericano De Ingeniería Mecánica-Cibim 2022

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ResumenLos MEMS (Micro-Electro-Mechanical Systems) tienen multitud de aplicaciones en campos de ciencia e ingeniería tan variados como la robótica, biomedicina, electrónica o espacio y comunicaciones. Muchos de estos dispositivos emplean antenas, capaces de recibir y emitir señales de radiofrecuencia, y bobinados o solenoides, capaces de interactuar con otras fuentes de campo electromagnético de tamaños micrométricos. Los métodos de fabricación usuales de estos microcomponentes tienen limitaciones que afectan al desempeño de la máquina de la que forman parte. En este artículo, se propone un nuevo sistema semiautomático que permite fabricar solenoides y microantenas por bobinado de cable de cobre en tamaños micrométricos. Asimismo, se describe el sistema completo, su modo de operación y métodos propuestos para la fabricación. Por último, se muestran resultados de fabricación y la caracterización de los microcomponentes logrados. Estos componentes son antenas cilíndricas helicoidales flexibles de 6.1mm de largo y 352 µm de diámetro, e inductores de hasta 5 capas, con una longitud de 680 µm, y un diámetro total de 300 µm.

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“…The winding is made of low electrical resistivity materials such as copper or aluminum. Different coils can be manufactured depending on the size of the winding, from macro to micro size [18]- [19]. Its shape can vary from planar coreless square coils [20] to slender round iron-cored coils [21].…”

Section: Introductionmentioning

confidence: 99%

Optimized Ferromagnetic Core Magnetorquer Design and Testing for LEO Nanosatellite Attitude Control

Villalba-Alumbreros,

Lopez-Pascual,

Diez-Jimenez

2024

ACES Journal

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Magnetorquers are a very suitable solution for the nanosatellite’s attitude and orbital control of low Earth orbit (LEO) given its constraints: small available volume, limited power consumption, and maximum weight limitation. In this work, an optimized ferromagnetic core magnetorquer is designed for LEO nanosatellites, considering the geometrical, electrical, and magnetic parameters in an electromagnetic finite element analysis (FEA). The final design dimensions are 10.9 mm diameter and 100 mm in length, with a ferromagnetic core made of high performance soft magnetic alloy Vacoflux50 measuring 5 mm diameter and 100 mm in length. Magnetorquer geometry has been optimized to achieve a very high compactness, reaching an optimal combination of high specific magnetic moment and magnetic moment-input power ratio at the same time. It shows a maximum magnetic moment of 1.42 Am2, a magnetic moment-input power ratio of 2.52 Am2/W, and a specific magnetic moment of 22.5 Am2/kg, with a power consumption of 0.565 W and 0.5 A. Such a combination of high-performance values has not been previously found. Furthermore, it has displayed higher magnetic moment and specific magnetic moment than previous prototypes in literature. The simulated model is validated with the experimental testing of a manufactured prototype, by measuring the magnetic and electric variables.

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Analysis of the geometric parameters influence in PCB fixtures for 2D multipole magnetization patterning of thin layer micro-magnets

Cited by 9 publications

References 14 publications

Scale Effects on Performance of BLDC Micromotors for Internal Biomedical Applications: A Finite Element Analysis

Scale Effects on Performance of BLDC Micromotors for Internal Biomedical Applications: A Finite Element Analysis

Desarrollo de una máquina bobinadora semiautomática para la microfabricación de bobinados, antenas y solenoides micrométricos

Optimized Ferromagnetic Core Magnetorquer Design and Testing for LEO Nanosatellite Attitude Control

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