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Measurement of soft magnetic materials-Methods of measurement of closed-circuit magnetic rings
Release time:
2020-03-31
Source:
Www.fe2100.com Hunan Yongyi Technology Co., Ltd.
According to the shape of the soft magnetic material sample, the two measurement methods of closed circuit magnetic ring and open circuit strip rod can be divided into open circuit solenoid method and H coil magnetometer method. The following is the measurement method of closed-circuit magnetic ring for soft magnetic material measurement:
According to the shape of the soft magnetic material sample, the two measurement methods of closed circuit magnetic ring and open circuit strip rod can be divided into open circuit solenoid method and H coil magnetometer method. The following is
measurement of soft magnetic materialsMethods of measurement of closed-circuit magnetic rings:
measurement of soft magnetic materialsMethods of measurement of closed-circuit magnetic rings
1.1 start the computer first, then run
Direct Current Measurement of FE-2100SD Soft Magnetic Materials
Test the software, then close the "POWER" switch on the front panel of the power chassis. The header on the front panel of the power chassis should display "0.00" and warm up for 30 minutes. The test alligator clip is connected.
1.2 prepare the sample ring waiting for testing, measure the size and weigh it.
The winding of the number of turns of the secondary coil at the beginning of 1.3. The choice of coil turns can be changed according to the magnetic field strength required by the test. For example, for a sample with an outer diameter of 40mm, an inner diameter of 32mm, a height of 4mm, and a test condition of H = 800A/m, how many turns are appropriate? We can select the corresponding specifications in the condition column of the software, enter the actual size, the default number of turns is 1:1,Hs input 1000, and then press enter, Hs input 1000 automatically becomes 80. as shown in the following figure.
This also tells us that this sample can only be tested to 80A/m for 1 turn. If you want to test 800 A/m,N1 is equal to 10, and considering that the current of the power supply will be too large to exceed the maximum output (10A) and then give an alarm, we should leave 20% room, then N1 = 10*1.2 turns = 12 turns, and N2 we can generally use about 10 turns to test, so the final number of turns is 12:10.
In fact, the number of primary and secondary turns conforms to the following two formulas:
Calculation formula of magnetic field intensity: H = N×I/Le
In the formula: H is the magnetic field strength, the unit is A/m;N is the number of turns of the excitation coil; I is the primary excitation current (measured value), and the unit is A(I is 10A at most, and the current source is limited);Le is the effective magnetic path length of the test sample, and the unit is m.
Calculation formula of magnetic induction intensity: B = Φ/(N×Ae)
Where: B is magnetic induction intensity, unit is T;Φ is the secondary induced magnetic flux (measured value), unit is Wb(Φ is up to 20mWb, electronic integrator range limit);N is the number of turns of the induction coil; AE is the effective cross-sectional area of the test sample, in m2.
In this way, we can also derive the appropriate range of turns based on these two formulas in combination with the actual situation, which will not be described here.
1.4 New Index, Save As, and Name Folder. Folders can be named here according to company regulations or personal preferences. The general principle is to facilitate finding archives, etc. Select the appropriate sample size, enter the sample size and number of turns. Select "Simulate impact method", Tsw input 1 second, and check the "measurement of magnetization curve" and "measurement of hysteresis loop.
1.5 enter test conditions. Hi is the test starting point and the minimum test step. Different materials have different values. Since its setting directly affects the initial permeability μ I, the test can be set according to the actual test requirements, or refer to the following table:
| nanocrystalline |
Permalloy |
silicon steel |
Ferrite |
Electrician pure iron |
| 0.08A/m |
0.4A/m or 0.08A/m |
1A/m |
3A/m |
8A/m |
Hj is the inflection point of the test take point trend, generally ten times the size of the Hi value.
Hs is the test condition and the maximum magnetic field strength during the test. Since the DC static magnetic parameters are measured to ensure that the material is saturated, Hs is the magnetic field strength value that must saturate the material. Its setting can be determined according to the actual test requirements, or refer to the following table:
| nanocrystalline |
Permalloy |
silicon steel |
Ferrite |
Electrician pure iron |
| 80A/m |
1600A/m |
800A/m |
1200A/m |
10000A/m |
dB is the step size of B, generally 3% of Bs. Also refer to the following table:
| nanocrystalline |
Permalloy |
silicon steel |
Ferrite |
Electrician pure iron |
| 0.02T |
0.015T |
0.04T |
0.01T |
0.03T |
1.6 fluxmeter drift adjustment. After receiving the sample, observe the reading change trend of the magnetic flux meter on the software interface, rotate the multi-turn potentiometer on the front panel of the power supply chassis to make the reading of the meter slowly stable, and then press the reset key on the front panel to make the reading of the meter zero. Repeat this step if the reading in the header changes more quickly.
1.7 testing. Click "Test" in the software and the system starts demagnetizing the sample. After demagnetization, the software will automatically start the test until the test is completed. During the test, abnormal states such as excessive test current may occur, and the test power supply will also give an alarm accordingly. At this time, we can operate as follows: first press the "ESC/Exit" key of the keyboard or click "Cancel" at the bottom right of the software, the software will interrupt the test, and then press the "Alarm" button of the power supply chassis to interrupt the alarm. Re-check whether it is caused by error of parameters and conditions, or whether it is caused by short circuit of test clamp or test coil, readjust and re-test.
1.8 observe the data results, mainly observe the rationality of the curve and parameter results, and if necessary, adjust the parameters and the number of turns to retest. Save data for later data processing or archiving.
1.9 remove the sample, clean the site, and wait for the next batch of samples to be tested.
1.10 Make sure that the sample has been removed, turn off the power of the power chassis, then turn off the test software, turn off the computer, and clean the site.
Extended reading:
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