Pomiary parametrów materiałów magnetycznych przy alternatywnych wariantach wymuszenia sygnału magnesującego

W artykule przedstawiono wyniki pomiarów parametrów próbek materiałów magnetycznych przy zastosowaniu różnych wariantów wymuszenia sygnału magnesującego. Sinusoidalne wymuszenie napięciowe sygnału powoduje sinusoidalne wymuszenie indukcji magnetycznej, co powoduje odkształcenie natężenia pola, natomiast sinusoidalne wymuszenie prądowe sygnału magnesowania powoduje sinusoidalne wymuszenie natężenia pola, co skutkuje odkształceniem indukcji (strumienia magnetycznego). Porównano parametry podstawowych parametrów opisujących właściwości materiałów magnetycznych badanych próbek otrzymane dla dwóch wariantów wymuszeń pola.

The parameters of magnetic materials are determined by both the autonomic measuring stands, i.e. the volt-ampermeter method and the impedances bridges or the computer measuring systems. The sources of signal in measuring system to investigation of magnetic material parameters are alternating current power supplies. However, in automated measuring systems, the final unit of track feeding is power amplifier. It permits to extorting both the proper value of voltage and to supply the tested sample appropriate large current. The Polish Standard allows two variants of sinusoidal signal ex-tortion to investigation of magnetic materials. First of them is sinusoidal extortion of magnetic flux density B while the second variant admits to sinusoidal signal extortion of field intensity H into the tested sample. Extortion from theoretically ideal voltage source signal corresponds to the first option, while in the second variant is necessary ideal current source. In practice, to comply with requirement of the Standard, it is necessary to assure the condition of a much smaller or a much larger internal source impedance in relation to impedance of magnetizing winding of the test sample, respectively to condition of voltage or current extortion. Disposing of either the power supply with well-known internal impedance or the amplifier with well-known output impedance this condition be comply with properly selection of magnetizing winding number of turns. The investigation of magnetic materials of different samples in which was executed either the force of sinusoidal magnetic flux density, which effects the deformation of intensity of the field strength or sinusoidal force of the field strength which causes the deformation of magnetic flux is presented. The essential parameters of the magnetic materials of the test samples to obtain by means of two variants input signal force were compared. The investigations showed distinctness of measurements results of parameters of the same samples by applying the different variants of signal extortions admitted by the Standard.