| Summary: | 碩士 === 中原大學 === 電機工程研究所 === 102 === This dissertation investigates the effect of different core bending stress and composite-cored structures of magnetic properties on micro-fluxgate sensor with amorphous materials. Three types of amorphous alloys, including SA1, HB1 and HB1-M, are fabricated by HITACHI Metal Co. Japan, which is applicable into core thickness with 0.0254 mm 30 piece. Firstly, in order to analyze the core inner magnetic flux density distribution and magnetic loss, 3D simulation structure for fluxgate sensor was constructed by using finite element analysis method (FEA). Secondly, it is necessary to generate better magnetic anisotropy performance for amorphous core due to the core was annealed during 325 ℃ to 350 ℃ soak for 1hour and conducting at DC current to generate magnetic field density 800A/m. According to the experimental results, the measured characteristics of hysteresis loop, exciting power and magnetic loss under alternate current signal during 0.5k~3kHz, can be obtained. Thirdly, Fast Fourier Transformation (FFT) can be used to observer the magnetic core vibration. A better sensitivity property for magnetic fluxgate sensor operated at 3kHz, can be obtained. This study was proposed better magnetic properties for triangle forming core in bending stress than that counterpart of others cores. Finally, it is indicated that a better magnetic sensor performance for composite-cored structure with high magnetic induction, can be obtained.
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