Method and device for measuring hysteresis loop of ferromagnetic material in open magnetic circuit
A hysteresis loop, ferromagnetic material technology, applied in the field of magnetic measurement
Active Publication Date: 2017-08-22
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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[0008] The technical problem to be solved by the present invention is to provide a method for measuring hysteresis loops based on closed / semi-closed magnetic circuits in the existing "coil induction signal integration method" and "Hall sensor method", etc. Method and device for measuring hysteresis loop of ferromagnetic material in magnetic circuit
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[0028] The present invention will be further described in detail below in conjunction with specific embodiments and accompanying drawings.
[0029] Such as Figure 1-10 As shown, a device for measuring the hysteresis loop of ferromagnetic materials in an open magnetic circuit includes a fluxgate probe 1, a solenoid skeleton 2, a sample 4, a coil 6, a current direction switch 7, an adjustable constant flow source 8 , microcontroller 9 and magnetometer 10 .
[0030] By uniformly winding a coil 6 with a certain number of turns on the solenoid skeleton 2, and passing a DC current of a certain size in the coil 6, a specific magnetic field intensity is generated; the direction of the current is controlled by the current direction switch 7 Switch to generate forward current and reverse current, and then generate forward magnetic field and reverse magnetic field; through adjustable constant current source 8 to generate adjustable DC current; through differential fluxgate probes place...
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The invention discloses a method and device for measuring a hysteresis loop of a ferromagnetic material in an open magnetic circuit. The device comprises flux gate probes, a solenoid skeleton, a sample, a coil, a current direction changeover switch, an adjustable constant current source, a microcontroller and a magnetometer. The method comprises the steps of calibrating an instrument, eliminating remanent magnetism, measuring an initial magnetic curve, measurement in a progressive decrease stage of the magnetic field intensity, measurement in a progressive increase stage of the magnetic field intensity, and outputting hysteresis loops successively. During instrument calibration, a sample-free current-magnetic induction intensity curve of the instrument is obtained; during remanent magnetism elimination, whether the remanent magnetism intensity of the sample is 0 is determined according to an intersection point between a current-magnetic induction intensity curve in the present stage and the sample-free current-magnetic induction intensity curve; and in each of the initial magnetic curve measuring stage, the magnetic field intensity progressive decrease stage and the magnetic field intensity progressive increase stage, whether the sample reaches the maximal magnetic induction intensity Bm and the reverse maximal magnetic induction intensity -Bm is determined according to whether the gradient of the current-magnetic induction intensity curve in the corresponding stage is consistent with that of the sample-free current-magnetic induction intensity curve, the current-magnetic induction intensity curve in the corresponding stage is subtracted from the sample-free current-magnetic induction intensity curve to obtain the hysteresis loop of the corresponding stage, and further, a closed hysteresis loop is obtained.
Description
technical field [0001] The invention belongs to the field of magnetic measurement, and in particular relates to a method and a device for measuring hysteresis loops of ferromagnetic materials in an open magnetic circuit. Background technique [0002] Ferromagnetic materials are widely used in various engineering fields, such as transformers, motors, inductors, etc. Hysteresis is a basic characteristic of ferromagnetic materials, and the hysteresis loop can reflect important parameters such as coercive force and remanence strength of ferromagnetic materials, which is of great significance to the performance of ferromagnetic materials. [0003] The hysteresis loop refers to the periodic magnetization of ferromagnetic materials, and the relationship between the magnetic induction intensity B and the magnetic field intensity H is as follows: figure 1 The B-H closed curve shown in the middle curve abcdefa. Specifically, when the magnetic field strength H increase from zero to ...
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IPC IPC(8): G01R33/14
CPCG01R33/14
Inventor 申永鹏金楠郭磊磊窦智峰武洁刘安康
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY