Ballistic galvanometer measuring hysteresis loop of ferromagnetic medium method
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A technology of inrush current and hysteresis loop, applied in the field of physics teaching experiment in colleges and universities, can solve the problem of inability to measure electric charge constant
Inactive Publication Date: 2013-05-08
JIANGXI UNIV OF SCI & TECH
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[0003] At present, most colleges and universities in China use the oscilloscope method to measure the dynamic hysteresis loop of ferromagnetic media. Although this method is relatively intuitive, it measures the dynamic hysteresis loop of an alternating magnetic field and cannot measure the charge constant.
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Embodiment 1
[0071] Embodiment 1: Measuring the hysteresis loop and the magnetic field intensity H and the magnetic induction intensity B of the ferromagnetic medium
[0072] 1. Press figure 2 shown, switch the K 2 Turn to "b", M=0.001H, adjust R m = 1000Ω;
[0073] 2. Turn on the power supply of the impulse current meter G and slide the wire rheostat R 1 Adjusted to the maximum value, respectively closed R x Nine switches, and then close the DC power supply E switch K 1 , adjust the DC stabilized power supply E to a voltage of 25V, and then adjust R 1 Observe the ammeter A, so that the current passing through the steel ring coil YQ does not exceed 3A, and switch R in the order of switching from 8→0 x All nine switches of the switch are turned off;
[0074] 3. Measurement figure 1 The oa segment in the closed K 4 , closing R x 0 switch, at this time there is a current I 0 by L 1 , in the secondary coil L 2 An induced current passes through the impulse ammeter G, and the readi...
Embodiment 2
[0080] Embodiment 2: Electricity constant C q Measurement
[0081] 1. Press figure 2 As shown, adjust the voltage of DC stabilized power supply E to be less than 5V, switch K 3 hit a, R m Keep the original resistance value, adjust R 1 Make the current passing through the transformer M not exceed its rated value (I M not more than 0.4A).
[0082] 2. Quickly turn the switch K 2 commutation, current I M becomes -I M , through the magnetic flux change of the secondary coil of the transformer M, read the reading d of the impulse ammeter G M value.
[0083] 3. Write down I M 、d M , M value, calculate the charge constant C by the following formula q .
[0084] C q = 2 MI M Rd M
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Abstract
The invention discloses a teaching experiment device and aims to provide a ballistic galvanometer measuring hysteresis loop of ferromagnetic medium method. First of all, test circuit loop is set, and a direct-current stabilized voltage supply exerts a current on a primary coil of a steel circular ring coil. Through the regulation of an on-off switch which is connected with a current distribution resistance, a secondary coil of the steel circular ring coil can induce different currents and reads corresponding electric values from the ballistic galvanometer, and therefore the hysteresis loop of the steel circular ring coil and magnetic field strength are respectively drawn and measured. The direct-current stabilized voltage supply exerts a current on a primary coil of a standard mutual inductor, a secondary coil of the standard mutual inductor produces induced electromotive force and reads corresponding electric values from the ballistic galvanometer, and an electric quantity constant and magnetic induction intensity of the steel circular ring coil can be obtained through calculation. Due to the fact that the direct current is adopted to measure hysteresis loop of static ferromagnetic medium, scope of knowledge of students is broadened, measuring results can be displayed by coordinate paper or a computer, and manipulative ability of the students is improved.
Description
technical field [0001] The invention belongs to a physics teaching experiment method in colleges and universities, in particular to a method for measuring a hysteresis loop of a ferromagnetic medium with an impulse galvanometer. Background technique [0002] Among all kinds of magnetic media, ferromagnetic materials are the most widely used. Ferromagnetic materials are divided into two types: hard magnetic and soft magnetic. Hard magnetic materials (such as cast hysteresis steel) have a wide hysteresis loop, large remanence and coercive force (120-2000A / m), so the magnetic induction can be maintained, and it is suitable for making permanent magnets. Soft magnetic materials (such as silicon steel sheets) have narrow hysteresis loops and small coercive force (less than 120A / m), but their magnetic permeability and saturation magnetic induction are large, and they are easy to magnetize and demagnetize. They are often used as magnetic materials that work under dynamic conditions....
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