新型小损耗角磁心磁化特性脉冲测量法

Improved Pulse Measurement Method For Magnetization Characteristic Of powder core

针对小损耗角和高饱和磁通密度的金属磁粉心的磁化特性难以测量的问题,本文提出新型脉冲测量法,预置偏置电压的电容通过RLC振荡放电给被测磁性元件施加脉冲激磁电压,利用磁导率为真空磁导率的空心电感为标准磁性元件消除传统脉冲测量法的数值微分误差。在详细分析新型脉冲测量法的测量原理及误差来源的基础上建立测量系统。利用阻抗分析仪法验证其能够精确测量小损耗角金属磁粉心的磁化特性。

Compared with the method of large signal alternating current and impedance analyzer,the pulse method can be used to measure the magnetization characteristics of the magnetic field in a larger range without causing the temperature rise of the measured magnetic parts.However,due to the differential operation in the process of obtaining the magnetization characteristics,it will bring about large numerical differential error.In this paper,a new pulse measurement method is proposed.On the basis of the original pulse measurement circuit,the numerical differential error of the traditional pulse measurement method is eliminated by connecting a hollow inductor in series in the RLC oscillation circuit and replacing the original differential operation with ratio operation.An experimental platform was established and verified,which proved that the improved method can accurately measure the magnetic characteristics of small-loss angular cores.