CN101865882B - Automatic measuring system for iron loss of magnetic material - Google Patents
Automatic measuring system for iron loss of magnetic material Download PDFInfo
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- CN101865882B CN101865882B CN2010102010175A CN201010201017A CN101865882B CN 101865882 B CN101865882 B CN 101865882B CN 2010102010175 A CN2010102010175 A CN 2010102010175A CN 201010201017 A CN201010201017 A CN 201010201017A CN 101865882 B CN101865882 B CN 101865882B
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 47
- 239000000696 magnetic material Substances 0.000 title claims abstract description 32
- 238000012545 processing Methods 0.000 claims abstract description 43
- 238000005070 sampling Methods 0.000 claims abstract description 18
- 238000001914 filtration Methods 0.000 claims abstract description 7
- 230000001105 regulatory effect Effects 0.000 claims abstract description 6
- 238000005259 measurement Methods 0.000 claims description 25
- 230000007704 transition Effects 0.000 claims description 18
- 238000004804 winding Methods 0.000 claims description 12
- 230000004907 flux Effects 0.000 claims description 10
- 238000002955 isolation Methods 0.000 claims description 9
- 230000006698 induction Effects 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 6
- 230000005284 excitation Effects 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 229910000976 Electrical steel Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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Abstract
The invention discloses an automatic measuring system for iron loss of a magnetic material, which comprises a power circuit, a magnetic circuit and a measuring and control device, wherein the power circuit comprises a voltage regulating module, a rectifying filtering module and a PWM (Pulse Width Modulation) inverter module which are sequentially connected; the magnetic circuit comprises an Epstein square ring and a sample to be measured; the sample to be measured is arranged in the Epstein square ring; the measuring and control device comprises a computer processing module, a D/A conversion card, an A/D conversion card and a sampling module which is used for measuring the primary current and the secondary induced electromotive force of the Epstein square ring; the D/A conversion card is used for converting an input signal of the computer processing module into a modulating wave of the PWM inverter module; and the A/D conversion card is used for transmitting current and voltage signals collected by the sampling module to the computer processing module. By using the measuring system, a PWM iron loss curve of the magnetic material can be automatically and accurately measured with high measuring efficiency; and the system is stably operated.
Description
Technical field
The present invention relates to the magnetic material field of measurement, relate in particular to a kind of automatic measuring system for iron loss of magnetic material.
Background technology
In electrician trade, along with the development of power electronic devices and updating of power supply strategy, PWM (Pulse Width Modulation, width modulation) technology replaces traditional power supply mode gradually, is applied to the frequency conversion drive occasion more and more widely.And this novel with the mode of operation of pulse train as driving source under, except first-harmonic, also contain the harmonic wave of a large amount of switch secondary frequencies in the inverter output voltage frequency spectrum.Compare with sinusoidal excitation in the past, basic change has taken place in power supply mode, yet the designer is still continuing to use traditional design method when the design and analysis motor performance.For example, when calculating iron loss of magnetic material, table look-up by close first-harmonic of magnetic or peak value and to try to achieve the loss value of corresponding magnetic flux density waveforms.Cause the reason of this situation, be that on the one hand the magnetic material loss mechanism is complicated, theoretical research is made slow progress, not based on Physical Mechanism and simple and practical mathematical model; Be the scarcity of magnetic material experimental data base on the other hand.In general, iron company only provides under the power frequency (50,60Hz), and based on the close typical iron loss value of sinusoidal magnetic, reference value is extremely limited, and the loss value of other frequencies or the close correspondence of magnetic is often asked for roughly through the scaling factor and experience factor.Yet, under novel power supply mode, the performance of material and the bigger difference of in the past being familiar with that has.Therefore, under the theoretical incomplete situation of iron loss, be necessary to carry out the research of PWM excitation magnetic material property through experiment.
In view of the instrument of not measuring the core loss under the PWM power supply on the market, the researchist builds interim measuring table usually and experimentizes, and this interim measurement platform does not possess the function of automatic measurement, and efficient is not high, is not suitable for long-play.Therefore, demand urgently providing a kind of improved automatic measuring system for iron loss of magnetic material to overcome above-mentioned defective.
Summary of the invention
The technical matters that the present invention will solve is to provide a kind of automatic measuring system for iron loss of magnetic material, uses it can measure magnetic material automatic accurately, and like the PWM iron loss curve of silicon steel, efficiency of measurement height and system are stable.
In order to solve the problems of the technologies described above, the invention provides a kind of automatic measuring system for iron loss of magnetic material, it comprises power circuit, magnetic circuit and measurement and control device.Said power circuit comprises voltage regulating module, rectification filtering module and the PWM inversion module that is electrically connected successively.Said magnetic circuit comprises epstein frame and the print of being located in the said epstein frame to be measured.Said measurement and control device comprise computer processing module, D/A transition card, A/D transition card and are used to measure the primary current of said epstein frame and the sampling module of secondary induction electromotive force that said D/A transition card is the modulating wave of said PWM inversion module with the output conversion of signals of said computer processing module; Said A/D transition card sends the electric current and the voltage signal of said sampling module collection to said computer processing module.
Automatic measuring system for iron loss of magnetic material of the present invention can be used for the iron loss characteristic of the magnetic material under different fundamental voltage amplitudes, frequency, the excitation of different busbar voltage is measured; Realized the iron loss of on-line automatic measurement magnetic material; Measurement is accurate in real time and efficient is high, is particularly useful for the PWM iron loss curve that iron company obtains silicon steel.And the fundamental frequency of this system can be set at arbitrary integer in measurement range, has broken through the restriction of power frequency.
The present invention's technical scheme preferably is: said power circuit also comprises the electrical isolation module; Said electrical isolation module is connected the outgoing side of said width modulation inverter; Said electrical isolation module has been eliminated the influence of DC magnetic biasing, makes measurement result more accurate; Said magnetic circuit also comprises air-gap flux compensation mutual inductance; The elementary winding of said air-gap flux compensation mutual inductance and the elementary windings in series of said epstein frame; The induction windings in series reversal connection of secondary winding and said epstein frame is to eliminate in the air alternating flux to the influence of the close measurement result of magnetic unshakable in one's determination; Said D/A transition card is electrically connected with said computer processing module and said PWM inversion module through shielding line, and said A/D transition card is electrically connected with said sampling module and said computer processing module through shielding line.Because signal transmission line has adopted shielding line, makes that the measurement result drift is little, antijamming capability is strong.
Optimized technical scheme of the present invention is: said computer processing module comprises the parameter setting unit, is used to receive user instruction and controls the driving source of said computer processing module according to said user instruction; Storage unit is used to store electric current and the voltage that said sampling module measures; Signal processing unit is used for calculating the iron loss value according to the electric current and the magnitude of voltage of said storage unit; The figure generation unit is used for the iron loss curve according to the said print to be measured of generation of said signal processing unit; And display unit, be used to show the result of calculation of said signal processing unit and/or the iron loss curve that said figure generation unit generates.
The preferred technical scheme of the present invention is: said computer processing module also comprises the waveform recognition unit, is used to judge whether the modulating wave waveform is stable; Then under the in stable condition situation of said waveform, the primary current of said epstein frame and secondary induction electromotive force, whether stable through the identification waveform, get rid of the influence of disturbing measurement result, measuring repeatability is good; Said computer processing module comprises that also form generates storage unit; Be used for the result of calculation of the said signal processing unit of said demonstration and/or the iron loss curve of said figure generation unit generation are generated the form document file; The assembly material attribute database supplies other people to check and calls after being convenient to; Help reducing the duplication of labour, improve efficiency of measurement.
Through following description and combine accompanying drawing, it is more clear that the present invention will become, and these accompanying drawings are used to explain embodiments of the invention.
Description of drawings
Fig. 1 is the structural representation of an embodiment of automatic measuring system for iron loss of magnetic material of the present invention.
Fig. 2 is the structured flowchart of the computer measurement unit of automatic measuring system for iron loss of magnetic material shown in Figure 1.
Embodiment
With reference now to accompanying drawing, describe embodiments of the invention, the similar elements label is represented similar elements in the accompanying drawing.As stated, the invention provides a kind of automatic measuring system for iron loss of magnetic material, use it can measure magnetic material automatic accurately, like the PWM iron loss curve of silicon steel, efficiency of measurement height and system are stable.
To combine accompanying drawing to set forth the technical scheme of the embodiment of the invention in detail below.As shown in Figure 1, the automatic measuring system for iron loss of magnetic material of present embodiment comprises power circuit 1, magnetic circuit 2 and measurement and control device 3.Said power circuit 1 comprises voltage regulating module 11, rectification filtering module 12 and the PWM inversion module 13 that is electrically connected successively.Said magnetic circuit 2 comprises epstein frame 21 and the print of being located in the said epstein frame 21 to be measured 22.Said measurement and control device 3 comprise computer processing module 31, D/A transition card 32, A/D transition card 33 and are used to measure the primary current of said magnetic circuit and the sampling module of secondary induction electromotive force; The input end of said D/A transition card 32 is connected with signal source in the said computer processing module 31; Output terminal is connected with said PWM inversion module 13, and the output conversion of signals that is used for said computer processing module 31 is the modulating wave of said PWM inversion module 13.The input end of said A/D transition card 33 is connected with sampling module, and output terminal is connected with said computer processing module 31, is used for sending the electric current and the voltage signal of said sampling module collection to said computer processing module 31.Particularly, said epstein frame 21 can be the epstein frame of 25cm.Silicon steel to be measured inserts said epstein frame 21 and overlaps after being cut to print 22 to be measured by standard, forms the unloaded transformer of no air gap.
As the preferred embodiments of the present invention; The magnetic circuit 2 of present embodiment also comprises air-gap flux compensation mutual inductance 23; The elementary winding 23a and the elementary windings in series of said epstein frame 21 of said air-gap flux compensation mutual inductance 23, the secondary winding 23b back-emf of reversal connection of connecting with the secondary winding of said epstein frame 21 with the formation of make-up air magnetic flux alternation.After compensation, output voltage only with print 22 to be measured in magnetic flux relevant.
Preferably, said power circuit 1 also comprises electrical isolation module 14, and said electrical isolation module 14 is connected the outgoing side of said width modulation inverter 13, with the DC component in the filtering excitation voltage, eliminates the influence of DC magnetic biasing.
Further; Said sampling module comprises current sensor 34a and voltage sensor 34b; Further, said current sensor 34a can be Hall element, is used for measuring the electric current of the primary coil of said epstein frame 21; Said voltage sensor 34b can be resistance pressure-dividing network, is used to measure the voltage of the secondary coil of said epstein frame 21.
Need to prove that the concrete structure of the voltage regulating module 11 of said power circuit 1, rectification filtering module 12, PWM inversion module 13 and electrical isolation module 14 all is well known to those skilled in the art, so omit detailed description at this.
As shown in Figure 2, in the present embodiment, said computer processing module 31 comprises parameter setting unit 311, is used to receive user instruction and controls the driving source of said computer processing module 31 according to said user instruction; Storage unit 312 is used to store electric current and the voltage that said sampling module measures; Signal processing unit 313 is used for calculating the iron loss value according to the electric current and the magnitude of voltage of said storage unit 312; Figure generation unit 314 is used for the iron loss curve according to the said print to be measured of generation of said signal processing unit 313; And display unit 315, be used to show the result of calculation of said signal processing unit 313 and/or the iron loss curve that said figure generation unit 314 generates.
Further, said computer processing module 31 can also comprise waveform recognition unit 316, is used to judge whether the modulating wave waveform is stable; Whether then under the in stable condition situation of said waveform, said signal processing unit 313 calculates the iron loss value according to electric current in the said storage unit 312 and magnitude of voltage, stable through the identification waveform, gets rid of the influence of disturbing measurement result, and measuring repeatability is good.
Further; Said computer processing module 31 can also comprise that form generates storage unit 317; Be used for the result of calculation of the said signal processing unit 313 of said demonstration and/or the iron loss curve of said figure generation unit 314 generations are generated the form document file; The assembly material attribute database supplies other people to check and calls after being convenient to, and helps reducing the duplication of labour, improves efficiency of measurement.
The course of work of the automatic measuring system for iron loss of magnetic material of present embodiment is described below.As shown in Figure 1, civil power passes through voltage regulating module 11 after rectifying and wave-filtering as the direct supply of PWM inversion module 13, passes through PWM inversion module 13 after electrical isolation module 14 flows to the epstein frame power supply.The D/A transition card is generated the output of modulating wave control PWM inversion module by user program; When the modulating wave waveform stabilization; Sampling module is sent exciting curent and square circle time magnitude voltage signals into the A/D transition card; Be kept in the computer processing module 31 after the quantification and resolve, measurement result is presented on the computer screen in real time.Can also generate the Excel archiving files simultaneously, the assembly material attribute database supplies other people to check and calls after being convenient to, and helps reducing the duplication of labour, improves efficiency of measurement.Preferably, can the result be apparent on the screen with the form of figure, be convenient to understand intuitively the iron loss curve of print to be measured.Concrete, can realize through the matlab software program.
Claims (9)
1. automatic measuring system for iron loss of magnetic material; Comprise power circuit, magnetic circuit and measurement and control device; It is characterized in that: said power circuit comprises voltage regulating module, rectification filtering module and the PWM inversion module that is electrically connected successively; Said magnetic circuit comprises epstein frame and the print of being located in the said epstein frame to be measured; Said measurement and control device comprise computer processing module, D/A transition card, A/D transition card and are used to measure the primary current of said epstein frame and the sampling module of secondary induction electromotive force that said D/A transition card converts the excitation source signal of said computer processing module into the modulating wave of said PWM inversion module; Said A/D transition card sends the electric current and the voltage signal of said sampling module collection to said computer processing module.
2. automatic measuring system for iron loss of magnetic material according to claim 1; It is characterized in that: said magnetic circuit also comprises air-gap flux compensation mutual inductance; The elementary winding of said air-gap flux compensation mutual inductance and the elementary windings in series of said epstein frame, the induction windings in series reversal connection of secondary winding and said epstein frame.
3. automatic measuring system for iron loss of magnetic material according to claim 2 is characterized in that: said power circuit also comprises the electrical isolation module, and said electrical isolation module is connected the outgoing side of said PWM inversion module.
4. according to each described automatic measuring system for iron loss of magnetic material of claim 1-3, it is characterized in that: said sampling module comprises current sensor and resistance pressure-dividing network.
5. according to each described automatic measuring system for iron loss of magnetic material of claim 1-3, it is characterized in that: said epstein frame is the epstein frame of 25cm.
6. according to each described automatic measuring system for iron loss of magnetic material of claim 1-3; It is characterized in that: said D/A transition card is electrically connected with said computer processing module and said PWM inversion module through shielding line, and said A/D transition card is electrically connected with said sampling module and said computer processing module through shielding line.
7. according to each described automatic measuring system for iron loss of magnetic material of claim 1-3, it is characterized in that: said computer processing module comprises
The parameter setting unit is used to select measurement pattern and sets the driving source parameter;
Storage unit is used to store electric current and the voltage that said sampling module measures;
Signal processing unit is used for calculating the iron loss value according to the electric current and the magnitude of voltage of said storage unit;
The figure generation unit is used for generating according to said signal processing unit the iron loss curve of said print to be measured; And display unit, be used to show the result of calculation of said signal processing unit and/or the iron loss curve that said figure generation unit generates.
8. automatic measuring system for iron loss of magnetic material according to claim 7 is characterized in that: said computer processing module also comprises the waveform recognition unit, is used to judge whether the modulating wave waveform is stable; Then under the in stable condition situation of said waveform, said sampling module is measured the primary current and the secondary induction electromotive force of said epstein frame.
9. automatic measuring system for iron loss of magnetic material according to claim 7; It is characterized in that: said computer processing module comprises that also form generates storage unit, is used for the result of calculation of the said signal processing unit of said demonstration and/or the iron loss curve of said figure generation unit generation are generated the form document file.
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| CN103177141B (en) * | 2011-12-26 | 2016-02-03 | 深圳光启高等理工研究院 | Artificial electromagnetic material design method and system |
| CN103226187B (en) * | 2013-04-23 | 2015-06-03 | 福州大学 | Method for measuring loss of magnetic element |
| CN104360294B (en) * | 2014-11-20 | 2017-08-08 | 保定天威保变电气股份有限公司 | The controllable transformer lamination Magnetic Performance Core test method of excitation condition and platform |
| CN106066426B (en) * | 2016-05-31 | 2019-08-23 | 广西电网有限责任公司电力科学研究院 | A kind of intelligent electric current transformer iron core sorter |
| CN106053953B (en) * | 2016-05-31 | 2019-06-28 | 广西电网有限责任公司电力科学研究院 | A kind of iron core for high-precision current mutual inductor sorter |
| CN106526330A (en) * | 2016-12-30 | 2017-03-22 | 贵州电网有限责任公司电力科学研究院 | Portable impact current generator for measuring impact ground resistance |
| CN109541507B (en) * | 2018-12-17 | 2021-01-08 | 武汉钢铁有限公司 | Single-sheet permeameter for detecting performance of oriented silicon steel sheet, detection device and detection method |
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| JPS58124975A (en) * | 1982-01-20 | 1983-07-25 | Nippon Denki Keiki Kenteishiyo | Iron loss measuring device |
| KR100231887B1 (en) * | 1997-02-20 | 1999-12-01 | 윤문수 | A testing system for high-frequency magnetic characteristics |
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