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

Fang Yuan1, Lizhan Zeng2, Xuedong Chen3

  • 1State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, Wuhan 430074, China. bigsquare@hust.edu.cn.

Sensors (Basel, Switzerland)
|March 16, 2019
PubMed
Summary

A novel electrodynamic exciter using a variable pole-arc ratio disk Halbach array (VPAR-DHA) achieves high torque and bandwidth for dynamic torsional stiffness testing. This design enhances magnetic fields for superior performance in material testing applications.

Keywords:
Halbach arraydisk voice coil motordynamic torsional stiffness testelectrodynamic exciterquasi-3-D modelvariable pole-arc ratio

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Area of Science:

  • Mechanical Engineering
  • Electromagnetics
  • Materials Science

Background:

  • Dynamic torsional stiffness testing requires high torque and bandwidth capabilities.
  • Existing electrodynamic exciters may not meet these demanding performance criteria.

Purpose of the Study:

  • To present a multi-module electrodynamic exciter for dynamic torsional stiffness testing.
  • To introduce a novel variable pole-arc ratio disk Halbach array (VPAR-DHA) for enhanced performance.

Main Methods:

  • Development of an analytical quasi-3-D model for the VPAR-DHA using the harmonic function method.
  • Inclusion of end-effects via a correction function in the analytical model.
  • Electromagnetic structure optimization based on the analytical model and verification using 3-D finite-element (FEM) analysis.

Main Results:

  • The VPAR-DHA design achieves high torque density and low rotor inertia by enhancing the magnetic field.
  • Experimental testing of a prototype demonstrated a peak dynamic torque output of 40 Nm at 120 Hz with a ±1° stroke.
  • The proposed exciter design meets the high torque and high bandwidth demands for dynamic torsional stiffness tests.

Conclusions:

  • The developed electrodynamic exciter, incorporating the VPAR-DHA, effectively meets the requirements for dynamic torsional stiffness testing.
  • The VPAR-DHA offers a viable solution for achieving high torque density and low rotor inertia.
  • The proposed method is adaptable for various dynamic torsional stiffness testing scenarios.