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Technical Brief

Using Liquid Metal in an Electromechanical Motor With Breathing Mode Motion

[+] Author and Article Information
Farhad Farzbod

Mem. ASME
Department of Mechanical Engineering,
University of Mississippi,
201A Carrier Hall,
University, MS 38677
e-mail: farzbod@olemiss.edu

Masoud Naghdi

Department of Mechanical Engineering,
University of Mississippi,
201A Carrier Hall,
University, MS 38677

Paul M. Goggans

Professor
Department of Electrical Engineering,
University of Mississippi,
22 Anderson Hall,
University, MS 38677

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received April 8, 2018; final manuscript received August 7, 2018; published online September 10, 2018. Assoc. Editor: Slava Krylov.

J. Vib. Acoust 141(1), 014501 (Sep 10, 2018) (4 pages) Paper No: VIB-18-1149; doi: 10.1115/1.4041140 History: Received April 08, 2018; Revised August 07, 2018

Electromechanical actuators exploit the Lorentz force law to convert electrical energy into rotational or linear mechanical energy. In these electromagnetically induced motions, the electrical current flows through wires that are rigid, and consequently, the types of motion generated are limited. Recent advances in preparing liquid metal alloys permit wires that are flexible. Such wires have been used to fabricate various forms of flexible connections, but very little has been done to use liquid metal as an actuator. In this paper, we propose and have tested a new type of motor using liquid metal conductors in which radial (or breathing) modes are activated.

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Figures

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Fig. 1

Helix made with polytetrafluoroethylene vibrating in air while the out-of-plane displacement is measured with a laser Doppler vibrometer

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Fig. 2

Schematic illustrating radial Lorentz force acting on a single loop of liquid metal. The magnetic field B is pointing into the page. Depending on the direction of the current, (a) clockwise or (b) counter-clockwise, the resultant Lorentz force is directed outward or inward, respectively. To keep the loop in space, the bottom point of the loop is fixed to the supporting structure.

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Fig. 3

(a) Schematic of the liquid metal electromechanical system. (b) Helix coil constrained at the bottom. The turns are tied together in three further locations.

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Fig. 4

Displacement versus frequency for three different tube materials: polyurethane, PFA, and PVC

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Fig. 5

Normalized displacement versus frequency for the polyurethane tube

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Fig. 6

Normalized displacement versus frequency for the three tube materials

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Fig. 7

Heat map of the displacement eigenmode in the y direction associated with the first mode for polyurethane

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