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Article

Rectangular Closed Double Magnetic Circuit Offering Ultra-Long Stroke for Ultra-Low-Frequency Vibration Exciter

by 1,2,*, 1,2, 1,2, 1,2 and 1,2
1
Center of Ultra-Precision Optoelectronic Instrument engineering, Harbin Institute of Technology, Harbin 150080, China
2
Key Lab of Ultra-precision Intelligent Instrumentation (Harbin Institute of Technology), Ministry of Industry and Information Technology, Harbin 150080, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(17), 6118; https://doi.org/10.3390/app10176118
Received: 21 July 2020 / Revised: 17 August 2020 / Accepted: 1 September 2020 / Published: 3 September 2020
(This article belongs to the Section Applied Physics)
High-performance magnetic circuit offering uniform magnetic flux density (MFD) along ultra-long stroke is the key to develop a vibration exciter for ultra-low-frequency (ULF) vibration calibration. In this paper, a rectangular closed double magnetic circuit (RCDMC) offering ultra-long stroke up to 1.2 m is modeled and optimized. In order to overcome the modeling difficulty arising from the long stroke, a high-accuracy theoretical model is established taking advantage of the structural symmetry of the RCDMC through lumped parameter magnetic equivalent circuit method. Matrix equations are derived based on Kirchhoff’s law and solved by iteration calculation to deal with the strong nonlinear characteristics of the yoke material. The deviations between the model and finite element method (FEM) analysis results are less than 1% for non-saturated yokes and ~10% for saturated yokes. Theoretically, an MFD up to 122 mT and an acceleration waveform harmonic distortion (AWHD) as low as 0.45% are achieved through model-based optimization. Experiments are carried out using an RCDMC prototype assembled in a horizontal vibration exciter. The experimental results show that an MFD of 102 mT and an AWHD of 0.27% along 1.2 m stroke are achieved, making the proposed RCDMC a solution for ULF vibration exciter. View Full-Text
Keywords: acceleration waveform harmonic distortion; magnetic flux density; rectangular closed double magnetic circuit; ultra-low-frequency; vibration exciter acceleration waveform harmonic distortion; magnetic flux density; rectangular closed double magnetic circuit; ultra-low-frequency; vibration exciter
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MDPI and ACS Style

Cui, J.; Li, W.; Bian, X.; He, Z.; Zou, L. Rectangular Closed Double Magnetic Circuit Offering Ultra-Long Stroke for Ultra-Low-Frequency Vibration Exciter. Appl. Sci. 2020, 10, 6118. https://doi.org/10.3390/app10176118

AMA Style

Cui J, Li W, Bian X, He Z, Zou L. Rectangular Closed Double Magnetic Circuit Offering Ultra-Long Stroke for Ultra-Low-Frequency Vibration Exciter. Applied Sciences. 2020; 10(17):6118. https://doi.org/10.3390/app10176118

Chicago/Turabian Style

Cui, Junning, Wei Li, Xingyuan Bian, Zhangqiang He, and Limin Zou. 2020. "Rectangular Closed Double Magnetic Circuit Offering Ultra-Long Stroke for Ultra-Low-Frequency Vibration Exciter" Applied Sciences 10, no. 17: 6118. https://doi.org/10.3390/app10176118

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