آزمایش رسم پس ماند در هسته آهنی(Ferromagnetics Hysteresis Exp)
Model 3-4
Solid State Experiments
هدف آزمایش:
بررسی پسماند مغناطیسی در هسته آهنی یک ترانسفورمر و رسم منحنی پسماند آن
وسایل آزمایش:
ترانسفورمر با هسته آهنی ، تقویت کننده ۸۰ وات (AC/DC) همراه با گالوانومتر ، سیستم الکترونیک و نرم افزار رسمی منحنی ، سیم رابط دو سر BNC (۲عدد) ، سیم رابط BNC فیشدار ( ۱ عدد) ، سیم رابط معولی ۱۰۰ cm (۲ عدد) ، رابط T BNC (1عدد)
:Descriptions
Recording the magnetization and hysteresis curves of a ferromagnet. In a ferromagnet, the magnetic induction B=mr . m۰ . H ; m۰ = ۴p * 10-۷ Vs/Am : magnetic field constant reaches a saturation value Bs as the magnetic field H increases. The relative permiability mr of the ferromagnet depends on the magnetic field strength H, and also on the previous magnetic treatment of the ferromagnet. Thus, it is common to represent the magnetic induction B in the form of a hysteresis curve as function of rising and falling field strength H. The hysteresis curve differs from the magnetization curve, which begins at the origin of the coordinate system and can only be measured for completely demagnetized material. In this experiment, a current I1 in the primary coil of a transformer which increases (or decreases) linearly over time generates the magnetic field strength H=I۱ *( N۱/L) ; L: efficient length of iron core, N۱ :number of windings of primary coil. The corresponding magnetic induction value B is obtained through integration of the the voltage U۲ induced in the secondary coil of a transformer: B= (1/ (A.N۲))*
U۲ . dt ; A :cross-section of iron core , N۲ :Number of windings of secondary coil. The computer-assisted measurement system interface card is used to control the current and to record and evaluate the measured values. The aim of the experiment is determine the relative permeability mr in the magnetization curve and the hysteresis curve as a function of the magnetic field strength H
