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Technical Briefs

Elastic Wave Suppression of Permanent Magnetic Motors by Pole/Slot Combination

[+] Author and Article Information
Shiyu Wang, Jinyou Xu, Jianping Liu, Ce Zhang, Yuhu Yang

School of Mechanical Engineering, Tianjin University, Tianjin 300072, China

Jie Xiu

School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China

J. Vib. Acoust 133(2), 024501 (Mar 01, 2011) (6 pages) doi:10.1115/1.4002954 History: Received April 17, 2009; Revised May 17, 2010; Published March 01, 2011; Online March 01, 2011

This work investigates the influence of the pole/slot combination on the elastic wave deformation of permanent magnetic motors. To this aim, the local wave superposition and distributed wave interaction methods are used during investigation. The methods borrow ideas from other fields such as the planetary gears, the turbines, and so on because of the inherent mechanical and magnetic symmetry of the motor. More precisely, the symmetry naturally presents some interesting and useful results without specifying the magnetic pulls/waves or even their magnitudes. The analysis results explicitly show that the elastic wave deformations only depend on whether particular algebraic relations are satisfied by the combination of pole number, slot number, magnetic pull order, and wave number. The predicted relationship and the wave suppression effectiveness are verified by the finite element method and a comparison with an existing literature. The relationship naturally provides simple guidelines for the elastic wave deformation suppression only by using the proper pole/slot combination.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

General elastic model of ring rotor

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Figure 2

Schematic of magnetic pull transition

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Figure 3

Schematic modulation of the magnetic pull

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Figure 4

Scheme of harmonic magnetic pull configurations

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Figure 5

Harmonic response of the example rotors

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