CAJ | 학술논문

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。
유음권와류효응인기적와류조항대소신호하동권양성기적고빈향응영향교대。기우집총삼수계통등효전로법，장와류조항적폭치화상위분별표시위각빈솔적멱지수함수，제출료음권와류조항적멱지모형。사용격광조항측량계통，측량득도료3충류형6지양성기단원적전조항곡선，병채용최소이승법대실측조항진행곡선의합，득도료와류조항적모형삼수。분석료모의조항치여실측치적오차，결과표명：멱지모형적모의결과준학반영료실측와류조항수빈솔적변화규률，폭치화상위오차균교소，여실험문합교호。
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.