CN108427085B - A method of measurement magnetic material magnetization characteristic - Google Patents
A method of measurement magnetic material magnetization characteristic Download PDFInfo
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- CN108427085B CN108427085B CN201810248393.6A CN201810248393A CN108427085B CN 108427085 B CN108427085 B CN 108427085B CN 201810248393 A CN201810248393 A CN 201810248393A CN 108427085 B CN108427085 B CN 108427085B
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
- G01R33/16—Measuring susceptibility
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Abstract
The present invention relates to a kind of methods for measuring magnetic material magnetization characteristic, on the basis of original exchange succusion, improve to test circuit, and measure and calculate on improved test circuit.The invention avoids the differential calculations in data handling procedure, to improve the measurement accuracy of exchange succusion, realize exchange succusion to the precise measurement of magnetic element magnetization characteristic.
Description
Technical field
The present invention relates to magnetic element magnetization characteristic design field, especially a kind of side for measuring magnetic material magnetization characteristic
Method.
Background technique
The optimization design of magnetic element need to accurately determine the magnetization characteristic of magnetic material in power inverter.Metal magnetic powder core
It is by the assembly of metal magnetic particle, insulation package and air (adhesive), saturation flux density is high, and magnetic conductivity is low,
Impedance angle is close to 90 degree.Excitation power supply capacity needed for measuring the magnetization characteristic of powder core magnetic element is big, and (excitation voltage is high or encourages
Magnetoelectricity stream is big), cause to measure extremely difficult.
The method of existing measurement magnetization characteristic mainly includes the big measurement of signal communication method magnetization curve (simplex winding and double wrap
Group), impulsive mensuration measurement magnetization curve, impedance measurement (impedance analyzer/LCR table)+direct current biasing source and exchange vibration
Swing method measurement magnetization curve.
However the above method has the following deficiencies:
1, there are two kinds of winding modes of simplex winding and double winding with magnetic element in big signal communication method measurement magnetization curve.When
Magnetic element uses influence of the voltage to measurement for needing to deduct AC resistance on winding when simplex winding coiling.When magnetic element is adopted
When with double winding coiling, distribution capacity and leakage inductance will affect the precision of measurement.When big signal communication method measurement relative permeability
The excitation of some frequency can only be selected to carry out Equivalent DC excitation, but because eddy current effect caused by ac-excited will affect measurement knot
Fruit.And big signal communication method needs high-power excitation power supply when being directed to high saturated magnetic induction magnetic core.
2, when the relative permeability of impulsive mensuration measurement high current biasing, winding loss AC resistance must equally be deducted
On influence of the voltage to measurement.Under conditions of voltagesecond product is equal, is switched by Timer Controlling and applied not to magnetic element
With pulsewidth excitation voltage when, excitation current amplitude is the same but change rate is different, and using numerical differentiation calculate increment magnetic
Conductance will generate very big measurement error.
3, high using the requirement in impedance analyzer measurement magnetization curve to impedance analyzer precision.Applying direct current biasing
When source, it is desirable that the internal resistance of bias current sources is sufficiently large, and frequency characteristic is good, bandwidth.Therefore overall cost is very high.
4, exchange succusion is when sampling tested magnetic part primary side excitation current with digital oscilloscope, the change of excitation current amplitude
Change very fast, cause the sampling error very big to excitation current, while will be to excitation electricity during calculating magnetization characteristic
The sampled value of stream carries out differential process, therefore the error sampled can be further magnified, and leads to not obtain complete magnetization spy
Linearity curve.
Summary of the invention
In view of this, the purpose of the present invention is to propose to a kind of methods for measuring magnetic material magnetization characteristic, in original exchange
On the basis of succusion, by improving to test circuit, the differential calculation in data handling procedure is avoided, to improve
The measurement accuracy of exchange succusion realizes exchange succusion to the precise measurement of magnetic element magnetization characteristic.
The present invention is realized using following scheme: a method of measurement magnetic material magnetization characteristic specifically includes following step
It is rapid:
Step S1: test circuit is provided, the test circuit includes: first switch S1, second switch S2, air core inductor
L0, air core inductor L0Dead resistance R0, the tested magnetic part L of annular1, the tested magnetic part L of annular1Dead resistance R1, DC power supply U,
Capacitor C, resistance R；The anode of the DC power supply U is connected with one end of the first switch S1, and the first switch S1's is another
One end is connected with one end of one end of the second switch S2, capacitor C, the other end of the second switch S2 and the hollow electricity
Feel L0Primary side winding one end be connected, the air core inductor L0Primary side winding the other end and the air core inductor L0Post
Raw resistance R0One end be connected, the air core inductor L0Dead resistance R0The other end and the tested magnetic part L of annular1Original
One end of side winding is connected, the tested magnetic part L of annular1Primary side winding the other end and the tested magnetic part L of annular1Post
Raw resistance R1One end be connected, the tested magnetic part L of annular1Dead resistance R1The other end and one end of the resistance R, institute
The other end for stating capacitor C is connected, and the other end of the resistance R is connected to the cathode of the DC power supply U；
Step S2: being closed first switch S1 and disconnects second switch S2, and DC power supply U gives the capacitor C to charge；
Step S3: it disconnects first switch S1 and is closed at second switch S2, capacitor C passes through air core inductor L0, air core inductor L0
Dead resistance R0, the tested magnetic part L of annular1And the tested magnetic part L of annular1Dead resistance R1Electric discharge；
Step S4: while acquiring air core inductor L0Vice-side winding on induced voltage u0, the tested magnetic part L of annular1Secondary side
Induced voltage u on winding1And flow through air core inductor L0Main limit winding excitation current i；
Step S5: because flowing through hollow inductance L0With the tested magnetic part L of annular1Excitation current i be the same electric current, and
The inductance value L of air core inductor0It will not change with the variation of excitation current i, therefore the tested magnetic of annular can be calculated using following formula
Part L1Magnetic field strength H and the tested magnetic part L of annular1Incremental permeability μ1Δ:
Wherein, N1For the tested magnetic element L of annular1The number of turns of primary side winding；N2For the tested magnetic element vice-side winding of annular
The number of turns；L0For the inductance value of hollow inductance；L1For the inductance value of the tested magnetic element of annular；AeIt is the tested magnetic element magnetic of annular
The effective sectional area of core；leIt is the effective magnetic circuit length of the tested magnetic element magnetic core of annular；μ0For magnetic conductivity in vacuum.
Further, wherein L0With L1Relationship it is as follows:
Further, in step S4, air core inductor is acquired using stored digital and processing oscillograph or acquisition process instrument
L0Vice-side winding on induced voltage u0, the tested magnetic part L of annular1Vice-side winding on induced voltage u1And it flows through hollow
Inductance L0Main limit winding excitation current i.
Further, the DC power supply U is high power constant potential source, and capacitor C selects suitable capacitor according to actual circuit
Value, to meet the oscillating condition formula of resistance-inductance-capacitance:
Further, the first switch S1 and second switch S2 is bidirectional thyristor.
Further, the air core inductor L0With the tested magnetic part L of annular1It is all made of double winding coiling, can be deducted in inductance
Influence of the dead resistance to measurement result is exchanged, the size and line footpath of field winding can be set according to excitation voltage and excitation current
Meter.Air core inductor L simultaneously0With the tested magnetic part L of annular1Using bifilar and by the way of, leakage inductance can be reduced, incude the line of winding
Diameter can be smaller.
Further, the air core inductor L0With the tested magnetic part L of annular1Inductance value it is close, so as to u0And u1Order of magnitude phase
When.
Compared with prior art, the invention has the following beneficial effects:
1, test circuit of the invention is simple, Yi Shixian.
2, the present invention has evaded numerical differentiation when exchange succusion obtains incremental permeability, improves magnetic element magnetization
The measurement accuracy of curve；
3, the present invention can also realize the degaussing of magnetic core while the magnetization characteristic of the high saturable core of precise measurement.
Detailed description of the invention
Fig. 1 is the test circuit diagram of the embodiment of the present invention.
Fig. 2 is the sample waveform figure of the test circuit of the embodiment of the present invention.
Fig. 3 is the magnetization characteristic schematic diagram of the tested magnetic part of the embodiment of the present invention.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and embodiments.
As shown in Figure 1, present embodiments providing a kind of method for measuring magnetic material magnetization characteristic, following step is specifically included
It is rapid:
Step S1: test circuit is provided, the test circuit includes: first switch S1, second switch S2, air core inductor
L0, air core inductor L0Dead resistance R0, the tested magnetic part L of annular1, the tested magnetic part L of annular1Dead resistance R1, DC power supply U,
Capacitor C, resistance R；The anode of the DC power supply U is connected with one end of the first switch S1, and the first switch S1's is another
One end is connected with one end of one end of the second switch S2, capacitor C, the other end of the second switch S2 and the hollow electricity
Feel L0Primary side winding one end be connected, the air core inductor L0Primary side winding the other end and the air core inductor L0Post
Raw resistance R0One end be connected, the air core inductor L0Dead resistance R0The other end and the tested magnetic part L of annular1Original
One end of side winding is connected, the tested magnetic part L of annular1Primary side winding the other end and the tested magnetic part L of annular1Post
Raw resistance R1One end be connected, the tested magnetic part L of annular1Dead resistance R1The other end and one end of the resistance R, institute
The other end for stating capacitor C is connected, and the other end of the resistance R is connected to the cathode of the DC power supply U；
Step S2: being closed first switch S1 and disconnects second switch S2, and DC power supply U gives the capacitor C to charge；
Step S3: it disconnects first switch S1 and is closed at second switch S2, capacitor C passes through air core inductor L0, air core inductor L0
Dead resistance R0, the tested magnetic part L of annular1And the tested magnetic part L of annular1Dead resistance R1Electric discharge；
Step S4: while acquiring air core inductor L0Vice-side winding on induced voltage u0, the tested magnetic part L of annular1Secondary side
Induced voltage u on winding1And flow through air core inductor L0Main limit winding excitation current i；
Step S5: because flowing through hollow inductance L0With the tested magnetic part L of annular1Excitation current i be the same electric current, and
The inductance value L of air core inductor0It will not change with the variation of excitation current i, therefore the tested magnetic of annular can be calculated using following formula
Part L1Magnetic field strength H and the tested magnetic part L of annular1Incremental permeability μ1Δ:
Wherein, N1For the tested magnetic element L of annular1The number of turns of primary side winding；N2For the tested magnetic element vice-side winding of annular
The number of turns；L0For the inductance value of hollow inductance；L1For the inductance value of the tested magnetic element of annular；AeIt is the tested magnetic element magnetic of annular
The effective sectional area of core；leIt is the effective magnetic circuit length of the tested magnetic element magnetic core of annular；μ0For magnetic conductivity in vacuum.
In the present embodiment, wherein L0With L1Relationship it is as follows:
In the present embodiment, hollow using stored digital and processing oscillograph or the acquisition of acquisition process instrument in step S4
Inductance L0Vice-side winding on induced voltage u0, the tested magnetic part L of annular1Vice-side winding on induced voltage u1And it flows through
Air core inductor L0Main limit winding excitation current i.
In the present embodiment, the DC power supply U is high power constant potential source, and it is suitable that capacitor C is selected according to actual circuit
Capacitance, to meet the oscillating condition formula of resistance-inductance-capacitance:
In the present embodiment, the first switch S1 and second switch S2 is bidirectional thyristor.
In the present embodiment, the air core inductor L0With the tested magnetic part L of annular1It is all made of double winding coiling, electricity can be deducted
Influence of the dead resistance to measurement result is exchanged in sense, the size and line footpath of field winding can be according to excitation voltages and excitation electricity
Stream design.Air core inductor L simultaneously0With the tested magnetic part L of annular1Using bifilar and by the way of, leakage inductance can be reduced, incude winding
Line footpath can be smaller.
In the present embodiment, the air core inductor L0With the tested magnetic part L of annular1Inductance value it is close, so as to u0And u1Quantity
Grade is quite.
More specifically, the magnetization characteristic of the present embodiment measurement platinum section DS270060 magnetic material magnetic element, is tested magnetic
The effective sectional area of part L1 is 68.32 × mm2；Effective magnetic circuit length is 65mm；Magnetic element uses double winding coiling, N1=N2
=50 circles；Theoretical calculation measured piece inductance value is 197 μ H, and it is 185uH that impedance analyzer, which measures measured piece inductance value,.Air core inductor
L0Effective sectional area be 1000mm2；Effective magnetic circuit length is 503mm；Equally using double winding and around N1=N2=225 circles；
Theoretical calculation air core inductor inductance value is 126.6uH, and it is 147uH that impedance analyzer, which measures inductance value,.Capacitor c-type number is PULOMCAP
PGT, capacitance 1.0uF, pressure-resistant 5000V, experiment use 4 capacitor parallel connections.DC source is Chroma PROGRAMMABLE DC
POWER SUPPLY.Switch S1 closure, DC source first give capacitor C to charge；Then switch S1 is disconnected, and switch S2 closure utilizes number
Electric current i, the hollow inductance pair side induced voltage u of the field winding of tested magnetic part are flowed through in the sampling of word oscillograph0With tested magnetic part pair
Side induced voltage u1.Sample waveform is shown in Fig. 2, uses formulaCalculate the magnetic field strength H on tested magnetic part, formulaCalculate the relative permeability μ of tested magnetic part1Δ；Draw magnetization characteristic such as Fig. 3 of tested magnetic part
It is shown.
The test circuit of the present embodiment is simple, Yi Shixian.The present embodiment has evaded exchange succusion and has obtained incremental permeability
When numerical differentiation, improve the measurement accuracy of magnetic element magnetization curve；The present embodiment is saturated magnetic in precise measurement height simultaneously
The degaussing of magnetic core can also be realized while the magnetization characteristic of core, and the foregoing is merely presently preferred embodiments of the present invention, Fan Yibenfa
The equivalent changes and modifications that bright claim is done, are all covered by the present invention.
Claims (6)
1. a kind of method for measuring magnetic material magnetization characteristic, it is characterised in that: the following steps are included:
Step S1: test circuit is provided, the test circuit includes: first switch S1, second switch S2, air core inductor L0, it is hollow
Inductance L0Dead resistance R0, the tested magnetic part L of annular1, the tested magnetic part L of annular1Dead resistance R1, DC power supply U, capacitor C, electricity
Hinder R；The anode of the DC power supply U is connected with one end of the first switch S1, the other end of the first switch S1 and institute
One end of one end, capacitor C for stating second switch S2 is connected, the other end of the second switch S2 and the air core inductor L0Original
One end of side winding is connected, the air core inductor L0Primary side winding the other end and the air core inductor L0Dead resistance R0
One end be connected, the air core inductor L0Dead resistance R0The other end and the tested magnetic part L of annular1Primary side winding
One end is connected, the tested magnetic part L of annular1Primary side winding the other end and the tested magnetic part L of annular1Dead resistance R1
One end be connected, the tested magnetic part L of annular1Dead resistance R1The other end and one end of the resistance R, the capacitor C
The other end is connected, and the other end of the resistance R is connected to the cathode of the DC power supply U；
Step S2: being closed first switch S1 and disconnects second switch S2, and DC power supply U gives the capacitor C to charge；
Step S3: it disconnects first switch S1 and is closed at second switch S2, capacitor C passes through air core inductor L0, air core inductor L0Post
Raw resistance R0, the tested magnetic part L of annular1And the tested magnetic part L of annular1Dead resistance R1Electric discharge；
Step S4: while acquiring air core inductor L0Vice-side winding on induced voltage u0, the tested magnetic part L of annular1Vice-side winding
On induced voltage u1And flow through air core inductor L0Main limit winding excitation current i；
Step S5: the tested magnetic part L of annular is calculated using following formula1Magnetic field strength H and the tested magnetic part L of annular1Incremental permeability
μ1Δ:
Wherein, N1For the tested magnetic element L of annular1The number of turns of primary side winding；N2For the circle of the tested magnetic element vice-side winding of annular
Number；L0For the inductance value of hollow inductance；L1For the inductance value of the tested magnetic element of annular；AeIt is the tested magnetic element magnetic core of annular
Effective sectional area；leIt is the effective magnetic circuit length of the tested magnetic element magnetic core of annular；μ0For magnetic conductivity in vacuum.
2. a kind of method for measuring magnetic material magnetization characteristic according to claim 1, it is characterised in that: in step S4,
Air core inductor L is acquired using stored digital and processing oscillograph or acquisition process instrument0Vice-side winding on induced voltage u0、
The tested magnetic part L of annular1Vice-side winding on induced voltage u1And flow through air core inductor L0Main limit winding excitation current
i。
3. a kind of method for measuring magnetic material magnetization characteristic according to claim 1, it is characterised in that: the direct current
Source U is high power constant potential source.
4. a kind of method for measuring magnetic material magnetization characteristic according to claim 1, it is characterised in that: described first opens
Closing S1 and second switch S2 is bidirectional thyristor.
5. a kind of method for measuring magnetic material magnetization characteristic according to claim 1, it is characterised in that: the hollow electricity
Feel L0With the tested magnetic part L of annular1It is all made of double winding coiling, and using bifilar and by the way of.
6. a kind of method for measuring magnetic material magnetization characteristic according to claim 1, it is characterised in that: the hollow electricity
Feel L0With the tested magnetic part L of annular1Inductance value it is close.
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| CN110045307B (en) * | 2019-05-28 | 2021-11-02 | 福州大学 | Magnetic core material hysteresis loop measuring method |
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| CN117031380B (en) * | 2023-10-08 | 2023-12-19 | 清华四川能源互联网研究院 | Current sensor low-frequency characteristic verification circuit and verification method thereof |
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