CN114966496A - System and method for detecting magnetic property of silicon steel sheet for three-dimensional wound core - Google Patents
System and method for detecting magnetic property of silicon steel sheet for three-dimensional wound core Download PDFInfo
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Abstract
The invention discloses a system and a method for detecting the magnetic property of a silicon steel sheet for a three-dimensional wound core, wherein the system comprises a three-dimensional wound core magnetic behavior generator, a computer, a D/A converter, a power amplifier, an Epstein square ring and an A/D converter; the three-dimensional wound core magnetic behavior generator is used for generating excitation voltage waveform for measuring the magnetic performance of the silicon steel sample to be measured, inputting the excitation voltage waveform to the computer, then adjusting the gain of the power amplifier to enable the voltage at the input end of the Epstein square ring to reach a target value, further feeding a voltage signal back to the computer through the voltage at the output end of the Epstein square ring and a sampling resistor connected with a primary winding of the Epstein square ring, and then calculating the magnetic polarization strength, the magnetic field strength, the specific total loss and the specific apparent power of the silicon steel sample to be measured in the Epstein square ring by the computer. The method can reasonably characterize the magnetic performance of the silicon steel material in the three-dimensional coil iron core, and reasonably evaluate the magnetic performance of the silicon steel sheet in the three-dimensional coil iron core.
Description
Technical Field
The invention belongs to the technical field of silicon steel sheet detection, and particularly relates to a system and a method for detecting the magnetic property of a silicon steel sheet for a three-dimensional wound iron core.
Background
Silicon steel sheets are one of the main raw materials for manufacturing transformer cores, and their magnetic properties are related to the magnetization state of the core. The traditional transformer iron core is of a planar structure, and the magnetic flux density waveform and the excitation voltage waveform in the iron core column are both sinusoidal waveforms, so that the detection of the silicon steel sheet at present takes sinusoidal excitation voltage as the detection condition of the magnetic performance of the silicon steel sheet.
In the process that the iron core is magnetized, the magnetic flux of each iron core column is the result of the superposition of the magnetic fluxes of the two iron core single frames, and although the magnetic flux density and the excitation voltage of the iron core columns are both sine waves, the magnetic characteristic of the silicon steel material shows nonlinearity, so that the magnetic flux density in the silicon steel sheet is a non-sine wave containing higher harmonics.
Because the magnetic state of the silicon steel sheet in the traditional iron core is different, the magnetic state of the three-dimensional wound iron core is not considered in the measurement process by the existing detection system and measurement method for the magnetic property of the silicon steel sheet, the magnetic property of the silicon steel sheet in the three-dimensional wound iron core cannot be represented by the measurement result of the magnetic property of the silicon steel sheet, and the magnetic property of the silicon steel sheet in the three-dimensional wound iron core cannot be reasonably evaluated.
Disclosure of Invention
The invention aims to provide a system and a method for detecting the magnetic property of a silicon steel sheet for a three-dimensional wound iron core, wherein a three-dimensional wound iron core magnetic behavior generator is designed, and the magnetic behavior generator is utilized to generate an excitation voltage suitable for detecting the silicon steel sheet for the three-dimensional wound iron core, so that the magnetic flux density waveform in a detected silicon steel sheet is the same as the magnetic flux density waveform in the three-dimensional wound iron core; in order to measure the magnetic performance of the silicon steel sheet under the condition that the magnetic flux density contains harmonic waves, the peak value of a magnetic polarization intensity reference waveform is used as a judgment condition, the gain of a power amplifier is adjusted, and the magnetic polarization intensity, the magnetic field intensity, the specific total loss and the specific apparent power of the silicon steel sheet are calculated by using the voltage and the current of each subharmonic wave.
In order to achieve the purpose, the invention adopts the following technical scheme:
a magnetic property detection system for a silicon steel sheet for a three-dimensional wound core comprises a three-dimensional wound core magnetic behavior generator, a computer, a D/A converter, a power amplifier, an Epstein square ring and an A/D converter; the D/A converter, the power amplifier, the Epstein square ring and the A/D converter are sequentially connected, and the other ends of the D/A converter and the A/D converter and the three-dimensional wound core magnetic behavior generator are connected with the computer; the silicon steel sample to be tested is placed in an Epstein square ring;
the three-dimensional wound core magnetic behavior generator comprises a three-phase alternating current power supply, a signal generating assembly and a multi-channel A/D converter; wherein the signal generating assembly comprises a plurality of core devices T n Each iron core device comprises three circular rings wound by silicon steel sheets with the same geometric dimension and the same magnetization characteristic, different iron core devices have different B800/50 values, the three circular rings are tangent in pairs, and the resultant magnetic flux density of the two tangent circular rings is equal to that of the three-dimensional wound iron core; windings an, bn and cn are respectively wound on two adjacent circular rings of each group, and the windings an, bn and cn are connected with a three-phase alternating current power supply; a winding dn is wound on one of the circular rings of each iron core device, and each winding dn is connected with one channel of the multi-channel A/D converter; the number of turns of each corresponding winding in each iron core device is the same;
the three-dimensional wound core magnetic behavior generator is used for generating excitation voltage waveforms for measuring the magnetic performance of the silicon steel sample to be measured, inputting the excitation voltage waveforms into the computer, then adjusting the gain of the power amplifier to enable the voltage at the input end of the Epstein square ring to reach a target value, further feeding voltage signals back to the computer through the output end voltage of the Epstein square ring and a sampling resistor connected with a primary winding of the Epstein square ring, and then calculating the magnetic polarization strength J, the magnetic field strength H, the specific total loss P and the specific apparent power S of the silicon steel sample to be measured by the computer.
Further, according to the magnetic polarization strength J, the magnetic field strength H, the specific total loss P and the specific apparent power S of the tested silicon steel sample, the relation among the magnetic flux density B of the core column of the three-dimensional wound core, the magnetic field strength H, the specific total loss P and the specific apparent power S is obtained.
Furthermore, the signal generating assembly comprises n iron core devices, wherein n is an integer and is more than or equal to 4.
Furthermore, three rings of the n iron core devices are respectively wound by silicon steel sheets with the same magnetization characteristics, the B800/50 value of 1.86T to 1.96T and the step length of 0.01T.
A method for detecting the magnetic property of the silicon steel sheet for the three-dimensional wound core by using the system for detecting the magnetic property of the silicon steel sheet for the three-dimensional wound core comprises the following steps:
s1, obtaining the B800/50 value B of the tested silicon steel sample 0 Selecting by computer the corresponding B800/50 value equal to B 0 Core device T n Setting a voltage signal of a channel read by a computer according to the channel number of the corresponding multi-channel A/D converter;
s2, calculating effective value U of excitation voltage on windings an, bn, cn of iron core device when the set magnetic flux density is B by using formula (1) 0 ：
U 0 ＝8.88fNBA (1)
In the formula of U 0 The effective value of the voltage on the windings an, bn, cn of the iron core device is shown, N represents the number of turns of the windings an, bn, cn, A represents the sectional area of each ring of the iron core device, B represents the magnetic flux density set when the sample is measured, and f represents the magnetization frequency;
s3, adjusting the voltage value of the three-phase alternating current power supply to be U 0 Will U 0 Loaded into core devices T n On the windings an, bn and cn, the waveform of the induced potential e on the dn winding of the iron core device is the magnetic behavior waveform of the three-dimensional wound iron core, and e is converted into a digital signal through an A/D converter and then is input into a computer;
s4, the computer calculates the excitation voltage e of the silicon steel sample to be tested by using the formula (2) 1 I.e. the voltage over the epstein-square primary winding:
in the formula, e 1 The voltage of the primary winding of the Epstein coil is shown, e represents the output voltage of the three-dimensional wound core magnetic behavior generator,N 1 representing the number of turns of the primary winding of the Epstein coil, N 0 Denotes the number of turns of the core device winding dn, A 1 Showing the sectional area of the silicon steel sample to be measured in the Epstein coil;
s5, calculating the reference waveform J of the magnetic polarization strength in the silicon steel sample to be tested by the formula (3) m And get J m Peak value of
In the formula, J m Reference waveform, N, representing the magnetic polarization strength of a silicon steel specimen 2 The number of turns of the secondary winding of the Epstein coil is represented, and t represents time;
s6, obtaining the initial gain G of the power amplifier according to the formula (4) 0 Setting the gain G of the power amplifier to G 0 And loading an excitation voltage to the input end of the Epstein square ring through a power amplifier:
s7, output induction potential e of Epstein square coil secondary winding 2 Outputting to computer via A/D converter, calculating instantaneous value of magnetic polarization intensity J by formula (5), and obtaining peak value of J
Wherein j (i) represents the value of the magnetic polarization intensity at the ith time point, i being an integer; e.g. of the type 2 An output induced potential representing an Epstein square, n represents the number of sampling points in one cycle of the A/D converter, f representsFrequency of magnetization, J 0 Represents an integration constant satisfying equation (6):
s8, adjusting the gain G of the power amplifier until
S9, obtaining the sampling resistance R in the Epstein square circle S Voltage u on S And calculating the magnetic field intensity H in the silicon steel sample to be measured by using the formula (7):
wherein H represents the magnetic field strength in the silicon steel sample, u s Representing the voltage across the sampling resistor, R s Represents the resistance value of the sampling resistor, L m Represents the equivalent magnetic path length of an epstein square circle;
s10, calculating the specific total loss P of the silicon steel sample to be measured by using the formula (8) s ：
In the formula, P s The specific total loss of the tested silicon steel sample is shown, P represents the total loss of the silicon steel sample, k represents the harmonic frequency, L represents the length of the tested silicon steel sample, and m represents the mass of the silicon steel sample;
the loss of the kth harmonic is obtained by equation (9):
P(k)＝U r (k)·I r (k)+U j (k)·I j (k) (9)
wherein U is EponOutput voltage of the Stan Square coil, I is primary winding current, U r (k)、I r (k)、U j (k)、I j (k) Representing the real and imaginary parts of the kth harmonic voltage and current;
s11, calculating the specific apparent power S of the silicon steel sample by using the formulas (11), (12) and (13):
Q(k)＝U r (k)·I j (k)-U j (k)·I r (k) (13)
wherein S represents the specific apparent power of the silicon steel sample, and Q represents the reactive power of the silicon steel sample.
Further, the B800/50 value B of the silicon steel sample to be measured was measured according to the standard 0 。
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention provides a system and a method for detecting the magnetic property of a silicon steel sheet for a three-dimensional wound iron core, which can reasonably characterize the magnetic property of the silicon steel material in the three-dimensional wound iron core and realize reasonable evaluation of the magnetic property of the silicon steel sheet in the three-dimensional wound iron core.
Drawings
FIG. 1 is a block diagram of a system for detecting magnetic properties of a silicon steel sheet for a three-dimensional wound core according to the present invention;
FIG. 2 is a schematic diagram of a three-dimensional wound core magnetic behavior generator of the present invention;
FIG. 3 is a comparison graph of the magnetic performance (serve) of the oriented silicon steel for the three-dimensional wound core of the present invention and the magnetic performance (standard) of the oriented silicon steel measured according to the national standard GB/T3655-2008 of the comparative example;
fig. 4 is a waveform diagram of magnetic behavior of the three-dimensional wound core magnetic behavior generator of the invention under different B values.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The system for detecting the magnetic property of the silicon steel sheet for the three-dimensional wound iron core, disclosed by the embodiment of the invention, comprises a three-dimensional wound iron core magnetic behavior generator, a data bus, a computer, a D/A converter, a power amplifier, an Epstein coil and an A/D converter, as shown in figure 1. The magnetic behavior generator generates excitation voltage waveform for measuring the magnetic performance of the silicon steel sheet, the excitation voltage waveform is input into a computer through a data bus, the gain of a power amplifier is adjusted to enable the voltage at the input end of an Epstein square ring to reach a target value, a voltage signal is fed back to the computer through the voltage at the output end of the Epstein square ring and a sampling resistor connected with a primary winding of the Epstein square ring, then the magnetic polarization strength J, the magnetic field strength H, the specific total loss P and the specific apparent power S of the silicon steel sheet are calculated by the computer, and the relationship among the magnetic flux density B of the three-dimensional wound core column, the magnetic field strength H, the specific total loss P and the specific apparent power S is further obtained and is respectively shown in a figure 3(a), a figure 3(B) and a figure 3 (c).
Fig. 2 is a schematic diagram of a three-dimensional wound core magnetic behavior generator according to an embodiment of the present invention, which includes a three-phase ac power supply, a signal generating assembly, and a four-channel a/D converter. The signal generating assembly consists of 4 iron core devices T n And (n is 1,2,3 and 4), each iron core device consists of three circular rings which have the same geometric dimension and are wound by silicon steel sheets, the three circular rings are tangent with each other in pairs, and the resultant magnetic flux density of the two tangent circular rings on the designed iron core device is equal to that of the three-dimensional wound iron core. And windings an, bn and cn are respectively wound on two adjacent rings of each group (n is 1,2,3 and 4), a winding dn is wound on one ring of each iron core device (n is 1,2,3 and 4), and the turns of corresponding windings in each device are the same.
Specifically, three rings of T1 are all wound by silicon steel sheets with the same magnetization characteristics and B800/50 ═ 1.90T; three rings of T2 are all wound by silicon steel sheets with the same magnetization characteristics and B800/50 ═ 1.91T; three rings of T3 are all wound by silicon steel sheets with the same magnetization characteristics and B800/50 ═ 1.92T; the three rings of T4 are all wound by silicon steel sheet with the same magnetization characteristic and B800/50 ═ 1.93T. The dn (n ═ 1,2,3,4) windings of the four core devices are connected to a four-channel a/D converter which transmits the signals to a computer via a data bus.
The method for measuring the magnetic property of the silicon steel sheet for the three-dimensional wound core comprises the following steps of:
1) measuring the B800/50 value B of the measured silicon steel sample according to the method for measuring the magnetic property of the electrical steel sheet (strip) by Epstein Square circle in the Standard GB/T3655-2008 0 Selecting by computer the corresponding B800/50 value equal to B 0 Core device T n And setting the voltage signal of the channel read by the computer according to the channel number of the A/D converter.
2) Calculating effective value U of excitation voltage on windings an, bn and cn of iron core device when set magnetic flux density is B by formula (1) 0 ：
U 0 ＝8.88fNBA (1)
In the formula of U 0 Representing the effective voltage value V on the windings an, bn, cn of the iron core device; n represents the number of turns of the windings an, bn, cn; a represents the cross-sectional area of each ring of the core device, m 2 (ii) a B represents a magnetic flux density, T, set at the time of measuring the sample; f denotes the magnetization frequency, Hz.
3) Regulating three-phase AC power supply voltage value to U 0 Will U is 0 Loaded into core devices T n The waveform of the induced potential e on the winding of the iron core device dn, namely the magnetic behavior waveform of the three-dimensional wound iron core, is converted into a digital signal through an A/D converter and then is input into a computer.
4) Calculating the excitation voltage e of the measured silicon steel sample by the formula (2) through a computer 1 (i.e. the voltage over the epstein-square primary winding):
in the formula, e 1 Represents the voltage, V, over the epstein-barr primary winding; e represents the output voltage, V, of the three-dimensional wound core magnetic behavior generator; n is a radical of 1 Represents the number of turns of the primary winding of the epstein-barr; n is a radical of 0 Representing the number of turns of the core device winding dn; a. the 1 Represents the cross-sectional area, m, of a silicon steel sample in an Epstein coil 2 。
5) Then, the reference waveform J of the magnetic polarization strength in the silicon steel sample is calculated by the formula (3) m And get J m Peak value of
In the formula, J m A reference waveform, T, representing the magnetic polarization strength of the silicon steel sample; n is a radical of 2 Denotes the number of turns of the Epstein coil secondary winding (N) 1 ＝N 2 ) (ii) a t represents time, s.
6) Obtaining initial gain G of the power amplifier according to equation (2) 0 As shown in formula (4):
setting a gain G-G of a power amplifier 0 The excitation voltage is applied to the input of the Epstein coil via a power amplifier.
7) Output induced potential e of Epstein square coil secondary winding 2 Outputting to computer via A/D converter, calculating instantaneous value of magnetic polarization intensity J in silicon steel sheet by formula (5), and obtaining peak value of J
Wherein j (i) represents the value of the magnetic polarization intensity at the ith time point, i being an integer; e.g. of the type 2 Represents the output induced potential, V, of the epstein-barr; n represents the number of sampling points in one cycle of the A/D converter; f represents the magnetization frequency; j. the design is a square 0 To satisfy the integration constant of equation (6), T.
8) Adjusting the gain G of the power amplifier until
9) By sampling resistance R within the Epstein square S Voltage u on S Calculating the magnetic field strength H in the silicon steel sample by using the formula (7):
wherein H represents the magnetic field strength in the silicon steel sample, A/m; u. of s Represents the voltage across the sampling resistor, V; r s Represents the resistance value of the sampling resistor, Ω; l is m Represents the equivalent magnetic path length of Epstein's square loop, m (L) m ＝0.94m)。
10) Calculation of the specific Total loss P of the silicon Steel sample by equation (8) s ：
In the formula, P s The specific total loss of the silicon steel sample is shown as W/kg; p represents the total loss of the silicon steel sample, W; k represents the harmonic order; l represents the length of the silicon steel sample, m; m represents the mass of the silicon steel sample, kg;
the loss of the kth harmonic is obtained by equation (9):
P(k)＝U r (k)·I r (k)+U j (k)·I j (k) (9)
wherein, U is the output voltage of the epstein-barr square coil, I is the primary winding current as shown in equation (10):
U r (k)、I r (k)、U j (k)、I j (k) representing the real and imaginary parts of the k-th harmonic voltage and current.
11) Calculating the specific apparent power S of the silicon steel sample by using the formulas (11), (12) and (13):
Q(k)＝U r (k)·I j (k)-U j (k)·I r (k) (13)
wherein S represents the specific apparent power of the silicon steel sample, VA/kg; q is reactive power of silicon steel sample, VA.
Specific test examples are given below:
the specific parameters of the measurement system are shown in table 1:
TABLE 1 specific parameters of the measurement System
| Parameter(s) | Value of |
| N | 20 |
| A/m 2 | 0.0025786 |
| N 0 | 3 |
| A 0 /m 2 | 0.0012893 |
| f/Hz | 50 |
| A 1 /m 2 | 0.00005686 |
| N 1 | 700 |
| N 2 | 700 |
| Rs/Ω | 1 |
| G 0 | 5.1452 |
Setting B values one by one according to the table 2, and setting the initial value G of the gain of the power amplifier 0 Calculating U corresponding to different B values by a computer, setting the voltage of a three-phase alternating current power supply as U, outputting the voltage e by a three-dimensional wound core magnetic behavior generator, inputting the voltage e to the computer through an A/D converter, and calculating e by the computer 1 、J m And
the voltage output by the computer is output to the primary winding of the Epstein square through a D/A converter and a power amplifier, and the induced potential e of the secondary winding of the Epstein square is 2 Sampling the resistance voltage u S Feeding back to computer via A/D converter, and comparing with computer
And
adjusting the gain G of the power amplifier until
The H, P, S value corresponding to the B value was calculated by a computer.
The waveforms of the magnetic behavior of the three-dimensional wound core magnetic behavior generator under different B values are shown in fig. 4. Table 2 shows the measurement results of the magnetic properties of the silicon steel sheet for the three-dimensional wound core (silicon steel No. 20QG 085).
TABLE 2 measurement results
It will be understood by those skilled in the art that the foregoing is only an exemplary embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, since various modifications, substitutions and improvements within the spirit and scope of the invention are possible and within the scope of the appended claims.
Claims (6)
1. A magnetic property detection system for a silicon steel sheet for a three-dimensional wound core is characterized by comprising a three-dimensional wound core magnetic behavior generator, a computer, a D/A converter, a power amplifier, an Epstein coil and an A/D converter; the D/A converter, the power amplifier, the Epstein square ring and the A/D converter are sequentially connected, and the other ends of the D/A converter and the A/D converter and the three-dimensional wound core magnetic behavior generator are connected with the computer; placing the silicon steel sample to be tested in an Epstein square ring;
the three-dimensional wound core magnetic behavior generator comprises a three-phase alternating current power supply, a signal generating assembly and a multi-channel A/D converter; wherein the signal generating assembly comprises a plurality of core devices T n Each iron core device comprises three circular rings wound by silicon steel sheets with the same geometric dimension and the same magnetization characteristic, different iron core devices have different B800/50 values, the three circular rings are tangent in pairs, and the resultant magnetic flux density of the two tangent circular rings is equal to that of the three-dimensional wound iron core; windings an, bn and cn are respectively wound on two adjacent circular rings of each group, and the windings an, bn and cn are connected with a three-phase alternating current power supply; a winding dn is wound on one of the circular rings of each iron core device, and each winding dn is connected with one channel of the multi-channel A/D converter; the number of turns of each corresponding winding in each iron core device is the same;
the three-dimensional wound core magnetic behavior generator is used for generating excitation voltage waveform for measuring the magnetic performance of the silicon steel sample to be measured, inputting the excitation voltage waveform to a computer, then adjusting the gain of a power amplifier to enable the voltage at the input end of the Epstein square ring to reach a target value, further feeding a voltage signal back to the computer through the voltage at the output end of the Epstein square ring and a sampling resistor connected with a primary winding of the Epstein square ring, and then calculating the magnetic polarization strength J, the magnetic field strength H, the specific total loss P and the specific apparent power S of the silicon steel sample to be measured by the computer.
2. The system for detecting the magnetic properties of the silicon steel sheet for the three-dimensional wound core according to claim 1, wherein the relationship between the magnetic flux density B of the three-dimensional wound core and the magnetic field strength H, the specific total loss P and the specific apparent power S is obtained according to the magnetic polarization strength J, the magnetic field strength H, the specific total loss P and the specific apparent power S of the silicon steel sample to be detected.
3. The system for detecting the magnetic properties of the laminated silicon steel sheet for the stereoscopic wound core as claimed in claim 1, wherein the signal generating unit comprises n core devices, n being an integer and n ≧ 4.
4. The system for detecting the magnetic properties of the silicon steel sheet for the stereoscopic wound core according to claim 3, wherein the three rings of the n core devices are wound by silicon steel sheets having the same magnetization characteristics and the B800/50 value of 1.86T to 1.96T, respectively, with a step size of 0.01T.
5. A method for detecting the magnetic property of the silicon steel sheet for the three-dimensional wound core, which is realized by the system for detecting the magnetic property of the silicon steel sheet for the three-dimensional wound core according to any one of claims 1 to 4, is characterized by comprising the following steps:
s1, obtaining the B800/50 value B of the tested silicon steel sample 0 Selecting by computer the corresponding B800/50 value equal to B 0 Core device T n Setting a voltage signal of a channel read by a computer according to the channel number of the corresponding multi-channel A/D converter;
s2, calculating effective value U of excitation voltage on windings an, bn, cn of iron core device when the set magnetic flux density is B by using formula (1) 0 ：
U 0 ＝8.88fNBA (1)
In the formula of U 0 The effective values of the voltages on the windings an, bn and cn of the iron core device are represented, N represents the turns of the windings an, bn and cn, A represents the sectional area of each ring of the iron core device, B represents the set magnetic flux density when a sample is measured, and f represents the magnetization frequency;
s3, adjusting the voltage value of the three-phase alternating current power supply to be U 0 Will U is 0 Loaded into core devices T n On the windings an, bn and cn, the waveform of the induced potential e on the dn winding of the iron core device is the magnetic behavior waveform of the three-dimensional wound iron core, and e is converted into a digital signal through an A/D converter and then is input into a computer;
s4, the computer calculates the excitation voltage e of the silicon steel sample to be tested by using the formula (2) 1 I.e. the voltage over the epstein square coil primary winding:
in the formula, e 1 Representing the voltage on the primary winding of the Epstein coil, e representing the output voltage of the three-dimensional wound core magnetic behavior generator, N 1 Representing the number of turns of the primary winding of the Epstein coil, N 0 Denotes the number of turns of the core device winding dn, A 1 Showing the sectional area of the silicon steel sample to be measured in the Epstein coil;
s5, calculating the reference waveform J of the magnetic polarization strength in the silicon steel sample to be tested by the formula (3) m And get J m Peak value of
In the formula, J m Reference waveform, N, representing the magnetic polarization strength of a silicon steel specimen 2 The number of turns of the secondary winding of the Epstein coil is represented, and t represents time;
s6, obtaining the initial gain G of the power amplifier according to the formula (4) 0 Setting the gain G of the power amplifier to G 0 And loading an excitation voltage to the input end of the Epstein square ring through a power amplifier:
s7, output induction potential e of Epstein square coil secondary winding 2 Outputting to computer via A/D converter, calculating instantaneous value of magnetic polarization intensity J by formula (5), and obtaining peak value of J
Wherein j (i) represents the value of the magnetic polarization intensity at the ith time point, i being an integer; e.g. of the type 2 Representing the output induced potential of the Epstein coil, n representing the number of sampling points in one cycle of the A/D converter, f representing the magnetization frequency, J 0 Represents an integration constant satisfying equation (6):
s8, adjusting the gain G of the power amplifier until
S9, obtaining the sampling resistance R in the Epstein square circle S Voltage u on S And calculating the magnetic field intensity H in the silicon steel sample to be measured by using the formula (7):
wherein H represents the magnetic field strength in the silicon steel sample, u s Representing the voltage across the sampling resistor, R s Representing the resistance value, L, of the sampling resistor m Represents the equivalent magnetic path length of an epstein square circle;
s10, calculating the specific total loss P of the silicon steel sample to be measured by using the formula (8) s ：
In the formula, P s The specific total loss of the silicon steel sample to be measured is shown, P is the total loss of the silicon steel sample, k is the harmonic frequency, and L is the specific total loss of the silicon steel sample to be measuredLength, m represents the mass of the silicon steel sample;
the loss of the kth harmonic is obtained by equation (9):
P(k)＝U r (k)·I r (k)+U j (k)·I j (k) (9)
wherein U is output voltage of Epstein coil, I is primary winding current, and U is output voltage of Epstein coil r (k)、I r (k)、U j (k)、I j (k) Representing the real and imaginary parts of the kth harmonic voltage and current;
s11, calculating the specific apparent power S of the silicon steel sample by using the formulas (11), (12) and (13):
Q(k)＝U r (k)·I j (k)-U j (k)·I r (k) (13)
wherein S represents the specific apparent power of the silicon steel sample, and Q represents the reactive power of the silicon steel sample.
6. The method for detecting the magnetic properties of the silicon steel sheet for the stereoscopic wound core as claimed in claim 5, wherein the B800/50 value B of the silicon steel sample is measured in accordance with the standard 0 。
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