Measuring device for hysteresis loop made of ferromagnetic material and application method of measuring device

Abstract

The invention discloses a measuring device for a hysteresis loop made of a ferromagnetic material and an application method of the measuring device. The measuring device for the hysteresis loop made of the ferromagnetic material comprises an excitation circuit, a control circuit, an integrating circuit, a sampling resistor circuit, a liquid crystal display circuit, a key detecting circuit and an oscilloscope. According to the method, step values of excitation voltage and excitation resistance are set through programming a singlechip; the oscilloscope displays the hysteresis loop to be measured; and an upper computer measures and analyzes the coercivity, the remanence induction strength, the maximum field, the maximum magnetic induction strength and the magnetic hysteresis loss of the ferromagnetic material according to the hysteresis loop. The original mechanical switch and manual knob type switch control mode is replaced by a program control mode, and shortcomings that contacts of a knob switch are in a poor contact state easily, gears are easy to loosen, and the like are overcome. By an experimental instrument developed in the invention, the reliability of experimental equipment can be increased, and the service life of the experimental equipment can be prolonged. Owing to the program control mode, the step values of the excitation voltage are low, gears of the excitation voltage are sufficient, measurement precision is high, and practicality and accuracy are good.

Description

technical field [0001] The invention discloses a measuring device for a hysteresis loop of a ferromagnetic material and an application method thereof, belonging to the technical field of hysteresis loop measurement. Background technique [0002] "Research on the magnetization characteristics of ferromagnetic materials" is a classic experimental project in physical experiments. Through this experiment, we can understand the magnetization principle and law of ferromagnetic materials in a magnetic field, and can measure the hysteresis loop of the sample and determine its coercivity. Important physical parameters such as force, residual magnetic induction intensity, maximum magnetic field, maximum magnetic induction intensity and hysteresis loss are recognized, and the important practical value of ferromagnetic materials in the manufacture of permanent magnets, motors, transformers, and electromagnets is recognized. [0003] At this stage, the old and unchanged experimental inst...

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Problems solved by technology

[0003] At this stage, the old and unchanged experimental instruments used in various college laboratories have various defects such as single data, insufficient functions, aging damage, etc. The manual or semi-automatic methods are slightly cumbersome, and the degree of automation is very low, which can no longer meet the needs of technological development. Require

Taking the Physical Experiment Center of Nanjing University of Aeronautics and Astronautics as an example, the hysteresis loop tester used in the "Experiment of the Magnetization Characteristics of Ferromagnetic Materials" is a TH-MHC hysteresis loop tester produced by Hangzhou Tianhuang Electric Equipment Factory. The experimental instrument uses a mechanical knob to select the gear position. After a long time of use, the knob will loosen and the reliability is very poor. The gear position of the mechanical knob is very limited. The data generated is single and the function is insufficient, so it is impossible to obtain accurate hysteresis. line, and the instrument has been facing the situation of aging, damage and replacement since it was put into use

It has been far from being able to adapt to the trend of science and technology and the requirements of experimental teaching for college students

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