| 引用本文: | 孔晓鹏,曾新吾,田章福.动圈扬声器涡流阻抗建模.[J].国防科技大学学报,2014,36(6):37-42.[点击复制] |
| KONG Xiaopeng,ZENG Xinwu,TIAN Zhangfu.Modeling of eddy current impedance in moving-coil loudspeakers[J].Journal of National University of Defense Technology,2014,36(6):37-42[点击复制] |
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| 动圈扬声器涡流阻抗建模 |
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(国防科技大学 光电科学与工程学院，湖南 长沙 410073)
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| 摘要: |
| 由音圈涡流效应引起的涡流阻抗对小信号下动圈扬声器的高频响应影响较大。基于集总参数系统等效电路法，将涡流阻抗的幅值和相位分别表示为角频率的幂指数函数，提出了音圈涡流阻抗的幂指模型。使用激光阻抗测量系统，测量得到了3种类型6只扬声器单元的电阻抗曲线，并采用最小二乘法对实测阻抗进行曲线拟合，得到了涡流阻抗的模型参数。分析了模拟阻抗值与实测值的误差，结果表明：幂指模型的模拟结果准确反映了实测涡流阻抗随频率的变化规律，幅值和相位误差均较小，与实验吻合较好。 |
| 关键词: 动圈扬声器 涡流效应 等效电路 曲线拟合 |
| DOI：10.11887/j.cn.201406007 |
| 投稿日期：2014-04-28 |
| 基金项目: |
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| Modeling of eddy current impedance in moving-coil loudspeakers |
| KONG Xiaopeng1, ZENG Xinwu2, TIAN Zhangfu2 |
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(1.College of Opto-electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China;2.College of Opto electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China)
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| Abstract: |
| The eddy current impedance in voice coil affects the behaviors of the high-frequency response of moving-coil loudspeakers under small input voltage. Based on the equivalent electrical circuit method in lumped parametric system and using the power exponent function of angular frequency to fit the magnitude and phase of the eddy current impedance, the power exponent function model of voice-coil eddy-current impedance was presented. The electrical impedance curves of six loudspeaker units in three types were obtained by using the laser impedance measurement system and the model parameters of eddy current impedance were identified by fitting the measured impedance curves with the least square method. Error comparisons between the simulative values and the measured data show that the power exponent function model can accurately reflect the change relationships between the measured eddy-current impedance and frequency. The magnitude and phase have small errors and behave good correspondences with the measured data. |
| Keywords: moving-coil loudspeakers eddy-current effect equivalent electrical circuit curve-fitting |
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