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Sensors 2019, 19(6), 1272; https://doi.org/10.3390/s19061272

A Multi-Module Electrodynamic Exciter with a Variable Pole-Arc Ratio Disk Halbach Array for a High-Bandwidth Dynamic Torsional Stiffness Test

State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
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Received: 30 January 2019 / Revised: 4 March 2019 / Accepted: 6 March 2019 / Published: 13 March 2019
(This article belongs to the Section Physical Sensors)
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Abstract

In this paper, a multi-module electrodynamic exciter based on moving-magnet disk voice coil motor is presented to meet the demands of high torque and high bandwidth in a dynamic torsional stiffness test. A variable pole-arc ratio disk Halbach array (VPAR-DHA) is proposed, so that both high torque density and low rotor inertia can be obtained through enhancing the magnetic field in the working range. The analytical quasi-3-D model of VPAR-DHA was set up by using the harmonic function method, with the consideration of end-effects by a correction function. Electromagnetic structure optimization was carried out with the analytical model, and verified by 3-D finite-element (FEM) results. The proposed design was experimentally tested and verified with a prototype that achieved a peak dynamic torque output of 40 Nm at a frequency of 120 Hz, and a stroke of ±1°. The proposed method can also be easily extended to satisfy various demands of dynamic torsional stiffness test. View Full-Text
Keywords: dynamic torsional stiffness test; electrodynamic exciter; disk voice coil motor; Halbach array; variable pole-arc ratio; quasi-3-D model dynamic torsional stiffness test; electrodynamic exciter; disk voice coil motor; Halbach array; variable pole-arc ratio; quasi-3-D model
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Yuan, F.; Zeng, L.; Chen, X.; Liang, C.; Ding, X.; Luo, X. A Multi-Module Electrodynamic Exciter with a Variable Pole-Arc Ratio Disk Halbach Array for a High-Bandwidth Dynamic Torsional Stiffness Test. Sensors 2019, 19, 1272.

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