利用数字式谐波反馈实现交流磁测量磁通波形正弦

基金项目:

国家自然科学基金资助项目(No.50471094)

详细信息

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

1. Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China;
2. Electromagnetic Division, National Institute of Metrology, Beijing 100013, China

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.
- 软磁合金 /
- 磁通正弦 /
- 谐波反馈 /
- 磁性测量
Abstract: 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.
- soft magnetic alloys /
- sinusoidal waveform of magnetic flux /
- harmonic feedback /
- magnetic measurement