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| Design and Experiment of High Frequency Magnetic Properties Testing Device for Rod Iron-Gallium Alloy |
| Huang Wenmei1,2, Tao Zheng1,2, Guo Pingping1,2, Xia Zhiyu1,2, Guo Wanli1,2 |
1. State Key Laboratory of Reliability and Interlligence of Electrical Equipment Hebei University of Technology Tianjian 300130 China;
2. Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology Tianjian 300130 China |
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Abstract As a new type of magnetostrictive material, iron-gallium alloy has the advantages of high magnetostriction and good mechanical properties. It has important application prospects in high technology fields such as transducer, sensor, precision mechanical control and mechanical transmission mechanism. Among them, the magnetostrictive hydroacoustic transducer made of iron-gallium alloy rod as the core driving element, usually requires the rod to work in the high frequency range of several kilohertz. Therefore, it is necessary to accurately measure and analyze the magnetic properties of iron-gallium alloy rod in this frequency band in order to provide theoretical guidance and experimental data to optimize the design of such high frequency and high power magnetostrictive devices.
However, in the high frequency band above 1 kHz, the magnetic flux density amplitude of the AMH-1M-S, a commercial high-frequency dynamic magnetic property tester made in Italy used in previous experimental tests, is only 0.1 T. Due to the high iron loss in the permeability circuit, high impedance in the excitation circuit and low permeability of the bar during high frequency excitation of the test device, a uniform and high value magnetic flux density in the iron-gallium alloy bar is very difficult to be obtained. Based on the electromagnetic field theory, this paper designs a high frequency and high magnetic flux density magnetic characteristics testing device for rod-shaped iron-gallium alloy material. Firstly, to solve the high frequency excitation problem, according to the magnetic loss theory, the magnetic circuit is constructed by choosing the high frequency permeability material with low core loss. Then, to improve the electromagnetic conversion efficiency, the excitation coil is wound by Litz line, which is less affected by high frequency skin effect and proximity effect. Finally, the impedance matching is carried out according to the principle of series resonance. In order to verify the feasibility of the above design method, a prototype high-frequency magnetic property test device is designed and an experimental platform is built for the bar-shaped iron-gallium alloy. The dimensional parameters of the selected iron-gallium alloy bar are 1 mm thickness, 20 mm height, and 10 mm×10 mm cross-sectional size. A large number of experimental results show that the high-frequency magnetic properties test device for iron-gallium alloy rod can provides flux densities of up to 0.26 T at excitation frequencies up to 9 kHz. The maximum flux density of about 0.2 T is still guaranteed inside the bar in the test band above 10 kHz. At a frequency of 1 kHz, the maximum measurable flux density is 0.89 T. At frequencies less than 1 kHz, the maximum flux density value inside the bar can be increased to more than 1 T. The highest flux density value available inside the bar increases as the test frequency decreases.
In summary, the high-frequency magnetic property testing device can provide uniform high magnetic flux density for dynamic magnetic property testing of iron-gallium alloy rod in the frequency range of kilohertz. The experimental platform is easy to operate, stable and reliable. It provides an important reference for the optimized design of high-frequency high-power magnetostrictive devices.
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Received: 31 October 2021
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2023, Vol. 38 
