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- Title
A Multi-Module Electrodynamic Exciter with a Variable Pole-Arc Ratio Disk Halbach Array for a High-Bandwidth Dynamic Torsional Stiffness Test.
- Authors
Yuan, Fang; Zeng, Lizhan; Chen, Xuedong; Liang, Chengyuan; Ding, Xiaojun; Luo, Xin
- 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.
- Subjects
ELECTRODYNAMICS; TORSIONAL stiffness; BANDWIDTHS; COILS (Magnetism); HARMONIC functions
- Publication
Sensors (14248220), 2019, Vol 19, Issue 6, p1272
- ISSN
1424-8220
- Publication type
Article
- DOI
10.3390/s19061272