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| Optimization Design of Non-uniform Air Gap Magnetic Field for Low-Frequency Electromagnetic Vibrator |
| ZHANG Xu-fei1,2, JIANG Wen-qi1, HU Tian-en1, ZHANG Feng-yang1 |
1. College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China
2. Key Laboratory of Advanced Transducers and Intelligent Control System of Ministry of Education and Shanxi Province, Taiyuan, Shanxi 030024, China
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Abstract Aiming at the vibration excitation signal distortion problem caused by nonlinearity of air gap magnetic induction intensity of large stroke low-frequency electromagnetic vibrator, a simplified large stroke magnetic circuit mathematical model is established based on the electromechanical coupling model analysis of electromagnetic vibrator and circuit equivalence principle. And the non-uniform distribution characteristics of air gap magnetic induction intensity are simulated and analyzed based on ANSYS Maxwell software. Based on the continuous mixed integer nonlinear programming algorithm, the distribution characteristics of air gap magnetic induction intensity corresponding to different nonlinear parameters of inner yoke outline and end face structure are simulated and analyzed respectively, and the optimal solutions of variable air gap and variable cross-section magnetic circuit with minimum nonuniformity are obtained. The simulation results show that the non-uniformity of 25.95% before optimization is reduced to 7.09% and 2.70% respectively. The optimized magnetic circuit structure can effectively improve the nonlinearity of air gap magnetic induction intensity of large stroke low-frequency electromagnetic vibrator, reduce the distortion of output vibration signal and improve the accuracy of low-frequency vibration calibration.
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Received: 16 August 2021
Published: 06 January 2022
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2022, Vol. 43 
