GB/T 3658-1990 Measurement methods of AC magnetic properties of soft magnetic alloys
Some standard content:
National Standard of the People's Republic of China
Method for measuring the AC magnetic properties of soft magnetic alloys
Sott magnidk alloy Measurement
Method for measuring the AC magnetic properties of soft magnetic alloys Content and scope of application
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#GB368
This standard specifies the definition of the ratio of the amount of magnetic conductivity and the energy distribution of the electric vehicle, the measurement method, and the calculation method. This standard is applicable to various environmental materials (such as magnetic materials containing gold or brocade, etc.), and is measured under the conditions of 10-35 degree of integration, E0-1060CH, and the secondary induction pressure is optional: 4 3 people are selected at will. When the measurement weight is specified in this standard, other energy presentation methods are allowed to be used. If there is any dispute, the energy presentation method specified in this standard shall prevail. 2 Meaning and symbols
2.1 Performance conductivity
The performance conductivity of the performance conductivity shall be shown in detail. 2.2t. Iron drawing
The total power of the unit mass of the test can be expressed by the symbol +
1 When the sample is measured, the equivalent line or a seven-pressure line containing the sample is connected with a ten-point inductance. The value of the amount of electricity is calculated! The tester selects the teacher's tight guide car. When the vice disk allows the user to report the ratio of the defect, the equivalent inductance of the own sample is an old electric and a high electric to work. Use the energy-saving electric research and measurement display, the number of students, and then calculate the ratio of the defect of the test. 3.2 Shuangke's book electric correction Bay's mountain phosphorus principle war road is shown in the figure: the original. Guohui Technical Supervision High 1990-D7-21 approved 1911 implementation
GB3658-
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b Repair Shanghai's bridge
Figure 1 Measurement principle circuit risk
B connected between the lines, - proportional starting period: - balanced power supply. - Fast power consideration - balanced power, (7) - refers to zero only: month, - AC system slightly electrical appliances, (, peak voltage fee; 3 one text two voltmeter purchase) - smoke car meter, sensitive winding; N: one ohm level drop group
3.3 Under a certain physical strength peak value, measure the elastic magnetic permeability of the sample, and use the peak positive voltage at both ends of the connected resistor to monitor whether the variable field strength reaches the reported value.
Measure the defects of the sample under a certain stress intensity value, and use the alternating current meter of the secondary cable chain to monitor whether the induction intensity reaches the preset value.
4 Sample
d.1 For strip with a thickness of not less than 0.15mm, use a ring sample with an inner diameter of 32mm, an outer diameter of 40mm and a thickness of 5-7mm.
For material with a thickness less than 0.15mm: take a strip with a width of 10mm in the rolling direction and wind it into a through ring with an inner diameter of 25mm and an outer diameter of 32mm after the final layer.
4.2 The sample should be flat, especially without defects such as burrs and cracks. 4.3 Before heat treatment, measure the inner and outer diameters of the sample with a ruler with an accuracy of 1.0?mIm, and weigh the mass of the sample with a balance with a sensitivity of one thousandth of a gram.
GB365#-90
4.4 The prepared test piece should be treated first: the test piece after heat treatment should not be subjected to stress (impact, shrinkage, stretching, bending, vibration, etc.).
4.5 Put the heat-treated sample into the sample tray made of non-magnetic continuous material. For the sample with deep coating, put insulating paper between each piece when loading. Burn the secondary winding outside the test box, and then turn over the magnetic winding. 5 Measurement load
5.1 ks
5.1. 1 Excitation or winding N
push coupon: 4~-50 turns, about .s of the wire
5.1.2 Series resistance R
P. It can be divided into four grades: 10, 10500 and 1000: non-inductive resistor, the accuracy is not less than 0.1 level within the full range. 5.1.3 batch design test K
R, can be divided into three grades: 1M1,500 and 1000, non-inductive resistor, its accuracy is the same as R. 5.1.4 Balanced resistance %
This is a decade-based AC resistance box. The resistance range is 0--11111152, the minimum step value is 1.10, the accuracy in the measurement increment range is the same as the comparison sweep
5.1.5 Balanced capacitance
This is a decade-based AC resistance box, the resistance range is ~2,111 UF, the minimum step value is 0.000 1F, the accuracy of the series capacitance box within the test frequency range is not less than 1.0.
5.7.6 Ladder value meter
This package is a high-voltage meter with multiple ranges of selected voltages! Meter: frequency range, 40H2~100Hz1
measurement range, 1mV~IC value>
input impedance is not less than 1M2; sensitivity is not less than L.5 level. 5.1-7 Description (3
Frequency range: 1011z~50k11z
Test panel voltage range: 30V--100m full scale value) The resistance is not less than 100k
Frequency selectivity: ±4H2Bandwidth is not more than--3dBS; 1 20 1(zPeak is not more than--42dB:
5.1. AC magnetizing power supply E
Frequency range is more, 4H~.15kHz continuously adjustable
Frequency compensation stability: 2Gmin does not exceed =0.1No output voltage! Stable discharge: not more than 12V per minute; output power is not less than 5W;
Input voltage: positive and continuous, maximum is 53V5. T.9 Density meter
The accuracy of the rate is 0.5 level,
5.2 Connect the positive sea wire
5.2.1 Excitation winding, secondary winding
Recommended N: 10, wire diameter is about 0.4mm, *2 is 20, wire diameter is about 0.3mm 5.2.2 Series resistance R
GB 3658—90
This resistor should have enough rate capacity. To ensure that the voltage is positive, its resistance can be 1--10, and the actual power is not less than 20W. No speed resistor, the voltage is not less than 10.1 level within the voltage range. 5.2. 3 Ratio resistor
This resistor can be used as an AC resistor. Its resistance range is 1000--1000002. Its accuracy is the same as R in the rated frequency range. 5.2.4 Balance resistor
This resistor is a decade AC resistor. Its value range is 0~111111. The minimum step value is 0. In the measured rated frequency range, the accuracy is the same as R.
5.2. 5 Compensation resistor
This resistor is used to compensate for the small current of the magnetic field. It is a carry-in capacitor, the value range is 11110, the product step value is 107, and the accuracy is the same as the rated range. 5.2.6 Half-balance capacitor
This capacitor is a decade-integrated capacitor, the minimum step value is 0~11.111F, 00001,F. In the range of the selected power, the power attenuation should not be less than 100%. 5.2. AC voltmeter ()
The AC voltmeter used in this method should be an average value voltmeter or an average response value scale high impedance multi-range voltmeter, the frequency range is 40H100H;
Measurement range: 1mV.~10V (full scale value)
Input impedance is not less than 1002;
Accuracy is not less than U, b level.
5.2.8 Indicator?
Frequency range: 40Hz---5kHz;
Measurement voltage range: r0~c full scale value>:
Input impedance is not less than 1002;
Frequency selectivity: bandwidth is not greater than -3;
20H bandwidth is not greater than 421B:
±4H bandwidth is not greater than -.
52.9 AC magnetizing power supply 5.
Return 5. 1. 8.
5.2.1G frequency meter
[Time 5. 1. 9.
5.3 Instrument verification
The instruments used in this standard shall be regularly verified by the national metrology department. The instruments shall be regularly tested by the standard test set by the national metrology department.
6 Measurement steps
6.1 Before measurement, the demagnetization shall be carried out first. The demagnetization method can be used as shown in Figure 2. S0H
GB3658-90
Figure 2 AC demagnetization device shows phase separation
2: Demagnetization limit, 7-demagnetization positive-phase demagnetization 6.1.1 Connect the sample as shown in Figure 2, adjust the output of the autotransformer to the basic value and exceed the inflection point of the demagnetization curve, slowly withdraw the secondary group of the magnetic transformer about 1m away, stop the secondary group from switching, and disconnect the power supply. 6.1.2 The withdrawal rate can be 5VHz. The withdrawal time is about 209, and it takes about 3mm after the withdrawal. 6.2 Use Maxwell precision to measure the elastic conductivity of the sample under a certain source frequency and a certain magnetic field strength. Connect the test piece to the Maxwell tester as shown in 1.
6.2.1 Connect the test piece to R: The relationship between the peak value of the electric field at both ends and the peak value of the density intensity is shown in formula (2):
In the formula: peak value of the core,
... average diameter of the sample,
· series self-resistance,
-- peak value of magnetic field intensity, A/m
8.2.2 During the measurement, the frequency of the zeroing instrument and the AC magnetizing source are selected at the specified value, and the input of the power supply is adjusted to make the indication value of the peak voltmeter the positive position corresponding to the given core magnetic field value. 6.2.3 Repeatedly adjust the balance resistor and balance resistor of the bridge, and adjust the sensitivity of the indicator until the value of the pointer is small. At this time, the bridge is considered balanced. Remember to be careful when balancing. Pull out the magnetizing power supply and return it to zero. 6.3 Use a positive bridge to scan the iron paste P at a constant rate and a constant magnetic induction peak value. Connect the sample to the Hay bridge as shown in 1. Before measuring, first measure the compensation resistor N, and select the most effective compensation resistor R according to the formula (R: R.
or in: R, - compensation value, 2;
ratio, - bridge resistance;
, - DC resistance of the magnetic winding,
6.3.2 The relationship between the induced voltage at both ends of the stage and the source test frequency and magnetic induction is determined by formula () or formula (4) 48
h = 4. 44f4gSH
Where:
average value of the secondary system voltage, V;
.effective value of the secondary winding induced voltage, Vi
Ω longitudinal effective voltage;
measuring disk value, Hz1
—sample cross-sectional area m
—micro induction intensity peak value, T.
GB3658—90
6.3.3 During measurement, use the instrument and The frequency of the AC power supply is selected to be within the specified value, and the output of the magnetizing power supply is adjusted to make the indication of the AC voltmeter equal to the voltage value corresponding to the given magnetic terminal. 6.3.4 The reverse branch adjusts the capacitance C and the resistance h of the bridge and matches the sensitivity of the instrument according to the commercial specifications until the zero indication of the instrument is the minimum. At this time, it is considered that the voltage correction has been almost balanced, and the balance value is recorded. When the output of the magnetizing power supply is returned to 6.4 to measure the elastic combustion conductor and the north iron, it is necessary to first ring the aldehyde. Then measure the magnetic field from low magnetic field to high magnetic field, and measure the width from low magnetic induction intensity. The frequency converter should be demagnetized first. Calculation
7.1 The average diameter of the test piece is calculated by formula (5): d+e
Where, —— the inner diameter of the sample, m
the whole diameter of the sample
. 2 The cross-sectional area of the sample is calculated by formula (6): Where: Xing
the basis of the test piece, ks
The density of the test piece is kg/m\.
7.3 The equivalent inductance L is calculated by formula (7): L-RRCh
element equivalent inductance I, H;
element equivalent inductance, F.
7.4 The elastic permeability u of the test piece is calculated by formula (8):
elastic conductivity, I/m,
7.5 The relationship between elastic permeability and relative elastic permeability is shown in formula (9): =,
wherein, no——vacuum permeability (=4r×10-\), H/m relative elastic permeability.
7.6 The parallel equivalent resistance is calculated by formula (10): 93
-（5)
Where:
One-way equivalent resistance value
R-step resistance value.2
The loss ratio formula of the sample (11>Random section: Where, P,
8Replace the complex
Test relative iron loss, w/tg.
6 3656-90
...(11)
When this standard is specified, the elastic conductivity and relative iron loss test results are expressed as standard deviations, which are 5% and 3% respectively. Additional remarks;
The standard is issued by the Ministry of Metallurgical Industry of the People's Republic of China. This standard is issued by the People's Republic of China. The main drafters of this standard are Aldehyde, Dong Anzhan and Ni Xinyu.
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