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CN208399665U - A kind of vertical three-phase flexibility wideband rotary magnetic characteristic measuring system - Google Patents

A kind of vertical three-phase flexibility wideband rotary magnetic characteristic measuring system Download PDF

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Publication number
CN208399665U
CN208399665U CN201821151737.3U CN201821151737U CN208399665U CN 208399665 U CN208399665 U CN 208399665U CN 201821151737 U CN201821151737 U CN 201821151737U CN 208399665 U CN208399665 U CN 208399665U
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China
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iron core
coil
layer
magnet exciting
exciting coil
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Withdrawn - After Issue
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CN201821151737.3U
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Chinese (zh)
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李永建
张凯
张长庚
岳帅超
窦宇
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Hebei University of Technology
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Hebei University of Technology
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Abstract

本实用新型公开了一种立式三相柔性宽频旋转磁特性测量系统,该系统包括无感电容、LabVIEW测试平台、功率放大器和立式三相柔性宽频磁特性检测装置;装置包括铁心固定支架、铁心、B‑H磁信号传感线圈板、支柱、励磁绕组、B探针、内层H线圈和外层H线圈;LabVIEW测试平台与功率放大器连接,功率放大器与无感电容连接,无感电容与励磁绕组连接。铁心固定于铁心固定支架上;支柱固定到铁心固定支架上,支柱顶部放置有待测样片;四根B探针均匀地固定在B‑H磁信号传感线圈板上;内层H线圈和外层H线圈绕制在B‑H磁信号传感线圈板上;B‑H磁信号传感线圈板放置于待测样片的中心位置处;铁心极头处嵌套有一个励磁绕组。

The utility model discloses a vertical three-phase flexible broadband rotating magnetic characteristic measurement system. The system comprises a non-inductive capacitor, a LabVIEW test platform, a power amplifier and a vertical three-phase flexible broadband magnetic characteristic detection device; the device comprises an iron core fixing bracket, Iron core, B‑H magnetic signal sensing coil plate, strut, excitation winding, B probe, inner H coil and outer H coil; the LabVIEW test platform is connected to the power amplifier, the power amplifier is connected to the non-inductive capacitor, and the non-inductive capacitor is connected connected to the field winding. The iron core is fixed on the iron core fixing bracket; the pillar is fixed on the iron core fixing bracket, and the sample to be tested is placed on the top of the pillar; the four B probes are evenly fixed on the B‑H magnetic signal sensing coil plate; the inner layer H coil and the outer layer The layer H coil is wound on the B‑H magnetic signal sensing coil plate; the B‑H magnetic signal sensing coil plate is placed at the center of the sample to be tested; an excitation winding is nested at the pole tip of the iron core.

Description

A kind of vertical three-phase flexibility wideband rotary magnetic characteristic measuring system
Technical field
The utility model relates to wideband rotary magnetic Characteristics Detection field, specifically a kind of vertical three-phase flexibility wideband rotary magnetic Characteristic measuring system.
Background technique
The measurement sample of magnetic material magnetic characteristic is single plate shape in electrician's equipment more general at present, and One-Dimension Magnetic is special Property measuring device in the most commonly used is rectangular monolithic sample structures, for example, being by growing for the sample of one-dimensional epstein frame method Bar shaped silicon steel sheet is formed by overlapping;Sample for two-dimentional single sheet measurement method is square Single Magnetic material.With to magnetic material Material research gradually deeply, need that the magnetic characteristic of each frequency band is tested in actual condition to monolithic-like magnetic material, And when measuring to sample to be tested, the magnetization homogeneous area at sample to be tested center needs to increase.So design three-phase is soft Property wideband magnetic characteristic detection device and measurement method become the essential ring of magnetic characteristic fields of measurement.
Traditional One-Dimension Magnetic feature measurement such as epstein frame method only considered the magnetic characteristic of a direction in plane, and two The magnetic characteristic measurement such as rectangular single sheet measurement method of two dimension is tieed up to enable in two in plane just using the print to be measured of square The field core in direction is handed over to carry out magnetized mode to square print to be measured.
Existing One-Dimension Magnetic characteristic measuring device and method only considered the magnetic characteristic of a direction in plane, but in reality In operating condition, if there is rotation magnetic characteristic in electric machine iron core dynamic magnetic characteristic, transformer turning or "T"-shaped junction, core material B, H relationship that magnetic conductivity or magnetic reluctance are embodied no longer are scalars but complicated tensor form.Therefore, traditional one-dimensional method is simultaneously It is not capable of measuring rotary magnetic characteristic, will lead to the inaccuracy of engineering calculation, and the practical biggish deviation of generation, this electromagnetism calculate Inaccuracy cause electrician equipment non-optimized design, so as to cause added losses increase or cause hot-spot The problems such as.
Existing two-dimensional magnetic property measuring device and method are using square print, and square print is relative to six sides For shape print, the center homogeneous area after print magnetization is good not as good as hexagon, and measurement error is bigger than hexagon print.It is existing It is identical with shape using plane formula excitation structure when two-dimensional magnetic property measuring device is measured using hexagon print Print stack into field core, this have the consequence that there is rotation magnetic characteristic in the "T"-shaped junction of field core, work as excitation When winding passes through electric current, iron core can generate bigger leakage field, and the induced voltage signal on the surface of print is natively very faint, also More spurious signals and harmonic wave can be introduced.
The magnetic characteristic detection device of prior art, excitation winding is low using rectangular configuration window utilization rate, and leakage field problem is prominent Out;Magnetic circuit material is silicon steel sheet, core loss with higher under high frequency, and heating problem is serious.The detection device of prior art It can not achieve the simulation that magnetic characteristic is rotated under high frequency.
" Zhang Yanli, He Houjian, shed is fragrant, the electrical sheet that KOH Chang-seop. is measured based on two-dimensional magnetic property for document Vector hysteresis model [J] Proceedings of the CSEE, 2010,30 (03): 130-135 " in print to be measured be it is rectangular, side Shape print is good not as good as regular hexagon compared to the uniformity coefficient for regular hexagon print when print is magnetized.And measurement B Transducing signal belongs to destructive measurement using the method tested, this method is punched on print, punches to be measured Measured zone on print can generate residual stress, pair the measurement of magnetic characteristic have larger impact.
Utility model content
In view of the deficiencies of the prior art, it is flexible that the technical issues of the utility model intends to solve is to provide a kind of vertical three-phase Wideband rotary magnetic characteristic measuring system.
The technical solution that the utility model solves the technical problem is to provide a kind of vertical three-phase flexibility wideband rotary magnetic Characteristic measuring system, it is characterised in that the system includes noninductive capacitor, LabVIEW test platform, power amplifier and vertical three Mutually flexible wideband magnetic characteristic detection device;Described device includes the fixed bracket of iron core, iron core, B-H magnetic signal sensor coil plate, branch Column, excitation winding, B probe, internal layer H coil and outer layer H coil;The LabVIEW test platform is connect with power amplifier, Power amplifier and noninductive capacitance connection, noninductive capacitor are connect with excitation winding;
The iron core is fixed on the fixed bracket of iron core;Iron core includes upper iron core, lower iron core and side iron core;It fixes The cartridge of upper iron core, lower iron core and side iron core is connected with each other, and junction forms a regular hexagon;The pillar is fixed to iron On the fixed bracket of the heart, the regular hexagon structure of post top portion and the cartridge of upper iron core, lower iron core and side iron core surround positive six Side shaped position is overlapped, and the regular hexagon structure top end of post top portion is placed with print to be measured, print to be measured and upper iron core, lower iron core With at the cartridge of side iron core be aligned and contact;Root B probe is uniformly fixed on B-H magnetic signal sensor coil plate;Internal layer H line Circle is wound on B-H magnetic signal sensor coil plate;Outer layer H coil winding is located at internal layer on B-H magnetic signal sensor coil plate It is on the outside of H coil and vertical with internal layer H coil;The B-H magnetic signal sensor coil plate is placed in the center position of print to be measured; An excitation winding is nested at each cartridge of upper iron core, lower iron core and side iron core.
Compared with prior art, the utility model beneficial effect is:
1, the iron core of the utility model is formed using the ultra-thin silicon steel coil system of 0.05mm, and ultra-thin silicon steel is compared to common silicon steel Have the characteristics that high saturation magnetic induction, high initial permeability, low core loss, heat resistance and wearability are good, due to print magnetic to be measured When changing to saturation state, the electric current that excitation winding is passed through be it is bigger, generated heat with the iron core of ultra-thin silicon steel few, to the temperature of print Rise situation influence it is small, test it is more accurate, test frequency can from several hertz to tens kHz.
2, the iron core in the utility model can be formed than square more in the regular hexagon central area that iron core surrounds Uniform magnetic field cooperates the print to be measured of regular hexagon, reduces excitation difficulty, improves experimental precision, and measures B sensing Signal belongs to non-destroyed measurement using the method tested with probe, this method, treats test sample piece compared to punching On measured zone can generate residual stress, have larger impact, the test side of this non-destroyed measurement to the measurement of magnetic characteristic Method can test the magnetic characteristic of more true magnetic material.
3, the utility model, can be according to different frequencies using the number of plies gradually increased trapezoidal excitation winding construction is segmented Different connection types is selected, the magnetic characteristic suitable for more broadband measures, frequency no longer fixed single, but can be by not Same input terminal and outlet terminal is flexibly connected, and each layer of excitation winding has input terminal and outlet terminal, facilitates reality Now different number of plies excitation windings is series-parallel, and compared to traditional rectangle excitation winding connection type, this segmentation number of plies is gradually Increased trapezoidal excitation winding construction increases the winding volume utilization rate in plane, reduces excitation difficulty, and it is difficult to reduce excitation It spends in print close to being very important when being magnetized into saturation state, because of the electricity that print closer to magnetic saturation, needs Bigger, the unbearable excessive electric current of experimental facilities in test is flowed, so it is particularly significant to reduce excitation difficulty.
4, the magnetic circuit of the utility model is formed using vertical three iron cores, compares plane Superimposed three-phase iron core, three iron The heart is mutually indepedent, and magnetic circuit does not intersect, and the magnetic line of force that each iron core generates is mutually indepedent in iron core, will not exist because of the magnetic line of force The spurious signal that intersects in iron core and harmonic wave cause experimental result inaccurate.
5, the utility model inductance capacitance ohmmeter measuring instrument measures the inductance under frequency and winding connection at this time, The capacitor needed at this time is calculated according to resonance equation, is matched using noninductive capacitor, advantage of this is that reduce to encourage Magnetic beach degree causes test experiments to be stranded so that the voltage in circuit will not increase too fast because of the raising with frequency It is difficult.
6, the system can be realized the accurate of a peacekeeping two dimension dynamic magnetic characteristic of the monolithic magnetic material in electrician's equipment Measurement.
Detailed description of the invention
A kind of overall structure axis of embodiment of the vertical three-phase flexibility wideband rotary magnetic characteristic measuring system of Fig. 1 the utility model It measures and is intended to;
Fig. 2 is a kind of vertical excitation winding of embodiment of three-phase flexibility wideband rotary magnetic characteristic measuring system of the utility model With iron core connection schematic diagram;
Fig. 3 be a kind of upper iron core of embodiment of the vertical three-phase flexibility wideband rotary magnetic characteristic measuring system of the utility model, Lower iron core, side iron core and print connection schematic diagram to be measured;
Fig. 4 is a kind of vertical excitation winding of embodiment of three-phase flexibility wideband rotary magnetic characteristic measuring system of the utility model Axonometric schematic diagram;
Fig. 5 is a kind of embodiment of the vertical three-phase flexibility wideband rotary magnetic characteristic measuring system of the utility model to test sample Piece, B-H magnetic signal sensor coil plate, internal layer H coil and outer layer H coil scheme of installation;
Fig. 6 is that a kind of B-H magnetic of embodiment of the vertical three-phase flexibility wideband rotary magnetic characteristic measuring system of the utility model is believed Number sensor coil plate, B probe, internal layer H coil and outer layer H coil scheme of installation;
Fig. 7 is a kind of embodiment of the vertical three-phase flexibility wideband rotary magnetic characteristic measuring system of the utility model without electrification Appearance, LabVIEW test platform, the connection schematic diagram of power amplifier and device;
Fig. 8 is that a kind of vertical iron core of embodiment of three-phase flexibility wideband rotary magnetic characteristic measuring system of the utility model is fixed Support schematic diagram;
Fig. 9 is that a kind of vertical upper iron core of embodiment of three-phase flexibility wideband rotary magnetic characteristic measuring system of the utility model shows It is intended to;
Figure 10 is a kind of side iron of embodiment of the vertical three-phase flexibility wideband rotary magnetic characteristic measuring system of the utility model Heart schematic diagram;
Figure 11 is that a kind of vertical pillar of embodiment of three-phase flexibility wideband rotary magnetic characteristic measuring system of the utility model shows It is intended to;
Figure 12 is that a kind of vertical buckle of embodiment of three-phase flexibility wideband rotary magnetic characteristic measuring system of the utility model shows It is intended to;(in figure: 1, the fixed bracket of iron core;2, upper iron core;3 lower iron cores;4, side iron core;5, print to be measured;6, B-H magnetic signal Sensor coil plate;7, it buckles;8, pillar;9, non-magnetic screw;10, excitation winding;11, first layer magnet exciting coil;12, second Layer magnet exciting coil;13, third layer magnet exciting coil;14, noninductive capacitor;15, LabVIEW test platform;16, B probe;17, internal layer H Coil;18, outer layer H coil;19, input terminal;20, outlet terminal;21, power amplifier)
Specific embodiment
Specific embodiment of the utility model is given below.Specific embodiment is only used for being further described originally practical new Type does not limit the protection scope of the claim of this application.
The utility model provide a kind of vertical three-phase flexibility wideband rotary magnetic characteristic measuring system (abbreviation system, referring to Fig. 1-12), it is characterised in that the system includes noninductive capacitor 14, LabVIEW test platform 15, power amplifier 21 and vertical three Mutually flexible wideband magnetic characteristic detection device (abbreviation device);Described device includes the fixed bracket 1 of iron core, iron core, B-H magnetic signal biography Feel coil plate 6, pillar 8, excitation winding 10, B probe 16, internal layer H coil 17 and outer layer H coil 18;The LabVIEW test is flat Platform 15 is connect with power amplifier 21, and power amplifier 21 is connect with noninductive capacitor 14, and noninductive capacitor 14 connects with excitation winding 10 It connects;
The iron core is fixed on the fixed bracket 1 of iron core by buckle 7 and the cooperation of non-magnetic screw 9;Iron core includes upper iron The heart 2, lower iron core 3 and side iron core 4;The cartridge of upper iron core 2, lower iron core 3 and side iron core 4 processes wedgewise;Upper iron core 2 is under Iron core 3 is identical, and the wedge shape of the cartridge of side iron core 4 is rotated by 90 ° relative to upper iron core 2 and the cartridge of lower iron core 3;What is fixed is upper The cartridge of iron core 2, lower iron core 3 and side iron core 4 is connected with each other, and junction forms a regular hexagon;The pillar 8 passes through Non-magnetic screw 9 is fixed on the fixed bracket 1 of iron core, the regular hexagon structure at 8 top of pillar and upper iron core 2, lower iron core 3 and side The regular hexagon position that the cartridge of face iron core 4 surrounds is overlapped, and the regular hexagon structure top end at 8 top of pillar is placed with regular hexagon Print to be measured 5, be aligned and contact at print 5 to be measured and the cartridge of upper iron core 2, lower iron core 3 and side iron core 4;4 B probes 16 are uniformly fixed on B-H magnetic signal sensor coil plate 6, positioned at the edge of B-H magnetic signal sensor coil plate 6;For examining Survey the B voltage signal induced when print 5 to be measured is magnetized;Internal layer H coil 17 is wound on B-H magnetic signal sensor coil plate 6 On;Outer layer H coil 18 is wound on B-H magnetic signal sensor coil plate 6, be located at the outside of internal layer H coil 17 and with internal layer H coil 17 is vertical, for detecting the H voltage signal induced when print 5 to be measured is magnetized;The B-H magnetic signal sensor coil plate 6 It is placed in the center position of print 5 to be measured;Each cartridge of upper iron core 2, lower iron core 3 and side iron core 4 is nearby nested with one A excitation winding 10;Excitation winding 10 be it is trapezoidal, enable plane where print 5 to be measured to place more magnet exciting coils;
Each excitation winding 10 includes input terminal 19, outlet terminal 20, first layer magnet exciting coil 11, second layer excitation Coil 12 and third layer magnet exciting coil 13;First layer magnet exciting coil 11, second layer magnet exciting coil 12 and third layer magnet exciting coil 13 The number of turns of middle first layer magnet exciting coil 11 is minimum, and the number of turns of third layer magnet exciting coil 13 is most, and the number of turns is successively incremented by;Adjacent layer Insulation processing is carried out between magnet exciting coil;The first layer magnet exciting coil 11, second layer magnet exciting coil 12 and third layer excitation wire Circle 13 is wound on iron core, is in close contact iron core;First layer magnet exciting coil 11, second layer magnet exciting coil 12 and third layer excitation wire Circle 13 is mounted on input terminal 19 and outlet terminal 20, between different exciting winding, same excitation winding different exciting coil Between can be gone here and there and be connected by input terminal 19 and outlet terminal 20;
Excitation winding 10 shares seven kinds of connection types, it may be assumed that connect each excitation winding first layer magnet exciting coil 11, Two layers of magnet exciting coil 12, third layer magnet exciting coil 13;Connect second layer magnet exciting coil 12, the third layer excitation of each excitation winding Coil 13;Connect first layer magnet exciting coil 11, the third layer magnet exciting coil 13 of each excitation winding;Connect each excitation winding First layer magnet exciting coil 11, second layer magnet exciting coil 12;Connect the first layer magnet exciting coil 11 of each excitation winding;Connection is each The second layer magnet exciting coil 12 of excitation winding;Connect the third layer magnet exciting coil 13 of each excitation winding.
The iron core is formed using the ultra-thin silicon steel coil system of 0.05mm.
The working principle and process of the vertical three-phase flexibility wideband rotary magnetic characteristic measuring system of the utility model are:
Step 1: the position that print 5 to be measured is placed on pillar 8, and adjusts print 5 to be measured make print to be measured 5 with It is aligned and contacts at the cartridge of upper iron core 2, lower iron core 3 and side iron core 4;
Step 2: selecting a kind of corresponding excitation winding connection type of test frequency, by corresponding input terminal 19 and goes out Line terminals 20 are attached;
Step 3: measuring the inductance under frequency and excitation winding connection type at this time with inductance capacitance ohmmeter measuring instrument, The capacitor needed at this time is calculated according to resonance equation, is matched using high voltage bearing noninductive capacitor 14, in reduction system Exciting current;
Step 4: three phase sine alternating current is each led into all excitation windings in three directions, passes through LabVIEW Test platform 15 issues single direction Alternating Current Excitation signal, after the amplification of power amplifier 21, controls three in excitation winding 10 The amplitude and phase of phase sinusoidal ac form the alternating magnetic field of single direction in print 5 to be measured in the planes;
Step 5: magnetic flux density and magnetic field intensity waveform, the voltage between the farther away two B probes 16 of detecting distance are observed Signal detects the induced voltage signal of internal layer H coil 17 and outer layer H coil 18, stores magnetic characteristic data, improves excitation voltage letter Number, until print 5 to be measured is saturated;
Step 6: after observing magnetic field saturation, slowly reduce excitation signal, treat test sample piece 5 and demagnetize;
Step 7: another single direction Alternating Current Excitation signal is issued by LabVIEW test platform 15, is put through overpower After big device 21 amplifies, control the amplitude and phase of three phase sine alternating current in excitation winding 10,5 institute of print to be measured in the planes The alternating magnetic field of another single direction is formed, step 5 and step 6 are repeated;
Step 8: three tunnel phases are issued by LabVIEW test platform 15 and cooperate excitation signal, by power amplifier 21 After amplification, the amplitude and phase of three phase sine alternating current in excitation winding 10 are controlled, forms rotating excitation field, weight in print 5 to be measured Multiple step 5 and step 6 obtain under the effect of different exciting voltage, the magnetic induction intensity and magnetic field strength trajectory diagram of sample;
Step 9: replacement excitation winding connection type, repeat Step 3: Step 4: Step 5: Step 6: step 7 and Step 8, until the magnetic characteristic detection under frequency and excitation mode needed for completing, obtains different frequency, the different exciting function of current Under, the magnetic induction intensity and magnetic field strength trajectory diagram of sample, and then can be with computed losses.
The utility model does not address place and is suitable for the prior art.

Claims (5)

1. a kind of vertical three-phase flexibility wideband rotary magnetic characteristic measuring system, it is characterised in that the system include noninductive capacitor, LabVIEW test platform, power amplifier and vertical three-phase flexibility wideband magnetic characteristic detection device;Described device includes that iron core is solid Fixed rack, iron core, B-H magnetic signal sensor coil plate, pillar, excitation winding, B probe, internal layer H coil and outer layer H coil;It is described LabVIEW test platform is connect with power amplifier, power amplifier and noninductive capacitance connection, and noninductive capacitor and excitation winding connect It connects;
The iron core is fixed on the fixed bracket of iron core;Iron core includes upper iron core, lower iron core and side iron core;The upper iron fixed The cartridge of the heart, lower iron core and side iron core is connected with each other, and junction forms a regular hexagon;The pillar is solid fixed to iron core On fixed rack, regular hexagon that the regular hexagon structure of post top portion and the cartridge of upper iron core, lower iron core and side iron core surround Position is overlapped, and the regular hexagon structure top end of post top portion is placed with print to be measured, print to be measured and upper iron core, lower iron core and side It is aligned and contacts at the cartridge of face iron core;Four B probes are uniformly fixed on B-H magnetic signal sensor coil plate;Internal layer H coil It is wound on B-H magnetic signal sensor coil plate;Outer layer H coil winding is located at internal layer H line on B-H magnetic signal sensor coil plate It is on the outside of circle and vertical with internal layer H coil;The B-H magnetic signal sensor coil plate is placed in the center position of print to be measured;On An excitation winding is nested at each cartridge of iron core, lower iron core and side iron core.
2. vertical three-phase flexibility wideband rotary magnetic characteristic measuring system according to claim 1, it is characterised in that upper iron core, The cartridge of lower iron core and side iron core processes wedgewise;Upper iron core is identical as lower iron core, and the wedge shape of the cartridge of side iron core is opposite It is rotated by 90 ° in the cartridge of upper iron core and lower iron core.
3. vertical three-phase flexibility wideband rotary magnetic characteristic measuring system according to claim 1, it is characterised in that excitation around It is trapezoidal for organizing, and plane at print place to be measured is enabled to place more magnet exciting coils.
4. vertical three-phase flexibility wideband rotary magnetic characteristic measuring system according to claim 1, it is characterised in that Mei Geli Magnetic winding includes input terminal, outlet terminal, first layer magnet exciting coil, second layer magnet exciting coil and third layer magnet exciting coil; The number of turns of first layer magnet exciting coil is minimum in first layer magnet exciting coil, second layer magnet exciting coil and third layer magnet exciting coil, third The number of turns of layer magnet exciting coil is most, and the number of turns is successively incremented by;Insulation processing is carried out between adjacent layer magnet exciting coil;The first layer is encouraged Magnetic coil, second layer magnet exciting coil and third layer magnet exciting coil are wound on iron core;First layer magnet exciting coil, second layer excitation wire Circle and third layer magnet exciting coil are mounted on input terminal and outlet terminal, are gone here and there and are connected by input terminal and outlet terminal It connects.
5. vertical three-phase flexibility wideband rotary magnetic characteristic measuring system according to claim 1, it is characterised in that the iron The heart is formed using the ultra-thin silicon steel coil system of 0.05mm.
CN201821151737.3U 2018-07-20 2018-07-20 A kind of vertical three-phase flexibility wideband rotary magnetic characteristic measuring system Withdrawn - After Issue CN208399665U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108919150A (en) * 2018-07-20 2018-11-30 河北工业大学 A kind of vertical three-phase flexibility wideband rotary magnetic characteristic measuring system and measurement method
CN111208454A (en) * 2020-01-09 2020-05-29 河北工业大学 Hall-coil combined type three-dimensional magnetic characteristic measurement sensing box

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108919150A (en) * 2018-07-20 2018-11-30 河北工业大学 A kind of vertical three-phase flexibility wideband rotary magnetic characteristic measuring system and measurement method
CN108919150B (en) * 2018-07-20 2023-05-02 河北工业大学 Vertical three-phase flexible broadband rotating magnetic characteristic measurement system and measurement method
CN111208454A (en) * 2020-01-09 2020-05-29 河北工业大学 Hall-coil combined type three-dimensional magnetic characteristic measurement sensing box

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