第1期 张燕宾等：利用数字式谐波反馈实现交流磁测量磁通波形正弦 85 2.0r 1.5 3结论 台 1.0 利用数字式谐波反馈原理对样品三次磁化后的 0 磁通波形进行谐波反馈补偿，能够有效降低磁通波 0.5 -1.0 形中的谐波含量，效果显著，虽然当硅钢进入深度 -1.5 饱和区时谐波反馈后磁通波形中的谐波含量只能降 -2.0 -2000-10000 -10002000 低到1%左右，但这对于磁性材料交流磁性测量而 磁场强度，H(Am) 言已经是很好的结果，当饱和程度进一步增加时， 图81.87T时硅钢的磁滞回线 高次谐波含量大大增加，补偿效果是有限的，而此时 Fig-8 Hysteresis of a sample at 1.87T 的磁感应强度值已经超出了标准规定的范围，软磁 20() 波形补偿前波形补偿后 o(b) 1.5 1.0 -0.5 0.5 0 -1.0 波形补偿后 -0.5 -1.0 -1.5h -1.5 波形补偿前 -2.0 -2.0 100200300400500600 100 120 140160180200 时间轴上的点数 时间轴上的点数 图91.87T时硅钢谐波反馈前后磁通曲线(a)和局部放大图(b) Fig.9 Magnetic flux wave before and after feedback at 1.87T(a)and magnified wave (b) 合金的所有交流磁性参数都应在磁通正弦条件下进 2003,34(3):26 行检定，本实验所提出的谐波反馈的方法对于实现 [5] MeFarlane J.Harris M J.The control of flux waveform in iron 这一条件有明显的效果， testing the application of feedback amplifier techniques.IEEE Trans Magn,1958,18,2254 参考文献 [6]Lyke R F.Modern magnetic testing equipment for electrical [1]周世昌.磁性测量.北京：电子工业出版社，1987 steels.IEEE Trans Magn.1982.18(6):1466 [2]北京大学物理系.铁磁学.北京：科学出版社，1976 [7]Qu QC.Precise magnetic properties measurements on electrical [3]Yoshizawa Y.Yamauchki K.Fe-base soft magnetic alloys com- sheet steels under deep saturation.IEEE Trans Magn.1984.20 posed of ultrafine grain structure.Mater Trans JIM.1990.31 (5):1717 (4):307 [8]GB/T3658软磁合金交流磁性能测量方法，北京：中国标准出 [4]刘亚丕，何时金·软磁材料的发展趋势.磁性材料与器材， 版社，1983 Achieving the sinusoidal waveform of magnetic flux in AC magnetic measurement by digital feedback of harmonic compensation ZHANG Yanbin.QU Qingchang2,LONG Y,CHANG Yongqin,YE Rongchang 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 ABSTRACI Sinusoidal waveform of magnetic flux is needed to obtain high-exactitude AC properties measure- ment 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 ob- tained.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 1.87T,the form factor fulfilled the condi- tion. KEY WORDS soft magnetic alloys;sinusoidal waveform of magnetic flux:harmonic feedback:magnetic mea- surement图8 1∙87T 时硅钢的磁滞回线 Fig．8 Hysteresis of a sample at1∙87T 3 结论 利用数字式谐波反馈原理对样品三次磁化后的 磁通波形进行谐波反馈补偿‚能够有效降低磁通波 形中的谐波含量‚效果显著．虽然当硅钢进入深度 饱和区时谐波反馈后磁通波形中的谐波含量只能降 低到1％左右‚但这对于磁性材料交流磁性测量而 言已经是很好的结果．当饱和程度进一步增加时‚ 高次谐波含量大大增加‚补偿效果是有限的‚而此时 的磁感应强度值已经超出了标准规定的范围．软磁 图9 1∙87T 时硅钢谐波反馈前后磁通曲线（a）和局部放大图（b） Fig．9 Magnetic flux wave before and after feedback at1∙87T （a） and magnified wave （b） 合金的所有交流磁性参数都应在磁通正弦条件下进 行检定‚本实验所提出的谐波反馈的方法对于实现 这一条件有明显的效果． 参 考 文 献 ［1］ 周世昌．磁性测量．北京：电子工业出版社‚1987 ［2］ 北京大学物理系．铁磁学．北京：科学出版社‚1976 ［3］ Yoshizawa Y‚Yamauchki K．Fe-base soft magnetic alloys com￾posed of ultrafine grain structure．Mater Trans JIM‚1990‚31 （4）：307 ［4］ 刘亚丕‚何时金．软磁材料的发展趋势．磁性材料与器材‚ 2003‚34（3）：26 ［5］ McFarlane J‚Harris M J．The control of flux waveform in iron testing the application of feedback amplifier techniques．IEEE Trans Magn‚1958‚18：2254 ［6］ Lyke R F． Modern magnetic testing equipment for electrical steels．IEEE Trans Magn‚1982‚18（6）：1466 ［7］ Qu Q C．Precise magnetic properties measurements on electrical sheet steels under deep saturation．IEEE Trans Magn‚1984‚20 （5）：1717 ［8］ GB／T 3658软磁合金交流磁性能测量方法．北京：中国标准出 版社‚1983 Achieving the sinusoidal waveform of magnetic flux in AC magnetic measurement by digital feedback of harmonic compensation ZHA NG Y anbin 1）‚QU Qingchang 2）‚LONG Y i 1）‚CHA NG Yongqin 1）‚Y E Rongchang 1） 1） Materials Science and Engineering School‚University of Science and Technology Beijing‚Beijing100083‚China 2） Electromagnetic Division‚National Institute of Metrology‚Beijing100013‚China ABSTRACT Sinusoidal waveform of magnetic flux is needed to obtain high-exactitude AC properties measure￾ment 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 ob￾tained．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 to1∙87T‚the form factor fulfilled the condi￾tion． KEY WORDS soft magnetic alloys；sinusoidal waveform of magnetic flux；harmonic feedback；magnetic mea￾surement 第1期 张燕宾等： 利用数字式谐波反馈实现交流磁测量磁通波形正弦 ·85·