利用数字式谐波反馈实现交流磁测量磁通波形正弦  

Achieving the sinusoidal waveform of magnetic flux in AC magnetic measurement by digital feedback of harmonic compensation

作　　者：张燕宾[1] 瞿清昌[2] 龙毅[1] 常永勤[1] 叶荣昌[1] 

机构地区：[1]北京科技大学材料科学与工程学,北京100083 [2]中国计量院,北京100013

出　　处：《北京科技大学学报》2007年第1期82-85,共4页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金资助项目(No.50471094)

摘　　要：在磁通正弦条件下进行软磁合金交流磁性测量可以获得高准确度的测量结果.利用数字式谐波反馈原理,通过对磁通波形的分析获得了磁通波形中的谐波含量,然后在电源输出端补偿与磁通波形中谐波幅值相反、相位相同的谐波,使磁通波形得到了改善.通过对硅钢样品在不同磁化程度时的测量,检验这一方法.当硅钢样品磁化为1·87T时,经谐波反馈后次级电压的波形系数也能满足国家标准的要求.Sinusoidal waveform of magnetic flux is needed to obtain high-exactitude AC properties measurement results of soft magnets. A new mode to achieve the condition by digital feedback of harmonic compensation was introduced, the waveform of magnetic .flux was analyzed, and the harmonic content in the wave was obtained. The waveform with the same altitude and opposite phase to the harmonic was supplied to the waveform-framing unit, and then the harmonic in output wave was counteracted. Measurement results of electrical steels showed that, after feedback, even at a peak value of induction up to 1.87 T, the form factor fulfilled the condition.

关 键 词：软磁合金 磁通正弦 谐波反馈 磁性测量 

分 类 号：TP202.2[自动化与计算机技术—检测技术与自动化装置]