CN116879596B - Complex background magnetic field generating device and test method for electromagnetic characteristic test - Google Patents
Complex background magnetic field generating device and test method for electromagnetic characteristic test Download PDFInfo
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
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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
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Abstract
The invention discloses a complex background magnetic field generating device and a testing method for electromagnetic property testing, which belong to the technical field of magnetic field generation. The invention generates a vertical specific magnetic field on one side of the wide surface of the superconducting coil in a current excitation mode, is used for simulating a complex magnetic field suffered by the superconducting coil in a motor environment, further tests the electromagnetic characteristic of the superconducting coil in the motor magnetic field environment, can complete electromagnetic characteristic evaluation of the superconducting coil without manufacturing a prototype, and provides referent data for design of the superconducting motor.
Description
Technical Field
The invention relates to the technical field of magnetic field generation, in particular to a complex background magnetic field generation device and a test method for electromagnetic property test.
Background
Along with the development and maturity of the high-temperature superconducting tape preparation technology, the high-temperature superconducting tape preparation technology benefits from the high current carrying characteristic, low cooling cost and excellent quench resistance compared with a low-temperature wire, and the application potential of the high-temperature superconducting technology in the fields of power equipment, electric propulsion, basic physics, medical treatment and the like is more remarkable.
Among them, a superconducting motor is becoming a powerful competitor for a high-power density permanent magnet motor as a novel motor having strong excitation capability, compact structure and high power density. Superconducting motors are classified into an excitation type superconducting motor having a high magnetic load, an armature type superconducting motor having a high electric load, and a full superconducting motor having both a high magnetic load and a high electric load, according to the positions of superconducting coils in the motor. In the superconducting motor, due to the high current carrying capacity of the superconducting coil, the same excitation ampere-turns or armature electric load as that of a common motor can be realized by using fewer coil turns, so that the slot area can be reduced, the motor volume can be reduced, and the power density can be further improved. Meanwhile, due to the zero resistance characteristic of the superconducting coil in a superconducting state, the joule loss of the superconducting coil in current transmission is almost zero, and therefore the superconducting motor has higher efficiency compared with a common motor. However, the exciting part of the traditional synchronous motor is positioned on the rotor, so that the superconducting exciting coil of the exciting superconducting motor corresponding to the traditional synchronous motor is positioned on the rotor in rotary motion, and in order to provide a low-temperature cooling environment for the superconducting coil, the rotary dynamic sealing cooling device is inevitably introduced into the motor, so that the operation hidden danger of the superconducting exciting coil is increased, the reliability is reduced, the manufacturing cost and the processing difficulty are greatly increased, and the market application of the motor is seriously influenced.
In order to solve various problems of a dynamic seal cooling device of an excitation type superconducting motor, the inventor creatively provides a superconducting motor concept capable of realizing static seal of a cooling system in the previous research, and has provided a topological structure, and the technology of the static seal cooling system and a novel topological structure motor carrying the technology are described in detail in a static seal self-prevention ultrahigh temperature superconducting motor (patent number: ZL 2017109736584) "," high temperature superconducting excitation magnetic flux switching motor low temperature cooling system (patent number: ZL 201310467839.1) "," novel static seal high temperature superconducting excitation magnetic flux switching motor (patent number: ZL 201610814189.7) ". The proposal of a static sealing cooling system and the proposal of a novel motor topology carrying the technology make the superconducting motor further put into market and practical use.
However, it should be noted that the electromagnetic properties of the superconducting tape show significant anisotropy to the external magnetic field, specifically, a magnetic field perpendicular to the broad side of the high-temperature superconducting tape (hereinafter referred to as a perpendicular magnetic field) will significantly reduce the critical current of the superconducting tape and cause higher ac loss; a magnetic field parallel to the wide side of the superconducting tape (hereinafter, simply referred to as a parallel magnetic field) hardly affects the electromagnetic properties of the superconducting tape in response to the perpendicular magnetic field. It follows that the electromagnetic properties (critical current properties, ac loss properties) of the superconducting tape are extremely sensitive to the perpendicular magnetic field, which makes the complex environmental magnetic field in the superconducting motor, especially the high amplitude (tens to hundreds of milli-tons) perpendicular magnetic field with complex waveform acting on the broad face of the superconducting coil, seriously affect the electromagnetic performance of the superconducting coil. Therefore, in the early stage of designing the superconducting motor, the electromagnetic characteristics of the superconducting coil, including critical current and ac loss, must be evaluated in detail, so that the rated exciting current, the rated armature current, the cooling capacity of the cooling system and the threshold value of the transmission current for ensuring safe operation of the motor can be determined.
In order to analyze the electromagnetic characteristics of the superconducting coils in the superconducting motor in detail, current domestic and foreign scholars and technicians mainly adopt finite element simulation analysis methods and empirical formula methods, and although the methods can analyze the electromagnetic characteristics of the superconducting coils in the motor environment to a certain extent, the background magnetic field in the motor is extremely complex, larger errors exist in calculation by adopting an empirical formula, and the finite element method has long calculation period and high modeling difficulty. As the most reliable and direct experimental method, it is often only performed after the prototype of the superconducting motor is manufactured, and the time cost and resource cost for performing the experiment are extremely high, if the experiment is not passed, there is a possibility that the prototype needs to be redesigned and remanufactured. Therefore, in order to overcome the huge cost problem of experiments carried out by manufacturing prototypes, the magnetic field generating device is utilized to simulate a background magnetic field which is similar to or even the same as a vertical magnetic field born by a superconducting coil in a superconducting motor on a superconducting coil sample, and the electromagnetic characteristics of the superconducting coil to be tested are tested, so that the method is an effective equivalent method.
Disclosure of Invention
The invention aims to provide a complex background magnetic field generating device and a testing method for electromagnetic property testing, which are used for generating a vertical specific magnetic field on one side of a wide surface of a superconducting coil in a current excitation mode and simulating a complex magnetic field suffered by the superconducting coil in a motor environment so as to test the electromagnetic property of the superconducting coil in the motor magnetic field environment. Meanwhile, a controllable background magnetic field can be provided for testing the electromagnetic characteristics of superconducting blocks and short superconducting strips.
In order to solve the technical problems, the invention provides the following technical scheme:
on one hand, a complex background magnetic field generating device for electromagnetic property testing is provided, and the complex background magnetic field generating device comprises a device main body, wherein the device main body comprises a C-shaped magnetic iron core, an excitation coil group is wound on the C-shaped magnetic iron core, the excitation coil group comprises a harmonic magnetic field excitation coil and a direct current magnetic field excitation coil, the opening position of the C-shaped magnetic iron core is used for placing a material to be tested, and the material to be tested comprises a superconducting coil, a superconducting bulk material or a superconducting strip short sample.
Furthermore, the number of the C-shaped magnetic conductive iron cores is two, the C-shaped magnetic conductive iron cores are symmetrically arranged at intervals, each C-shaped magnetic conductive iron core is wound with the excitation coil group, the material to be tested is a superconducting coil, and the superconducting coils are annularly arranged at the opening positions of the two C-shaped magnetic conductive iron cores.
Further, the complex background magnetic field generating device further comprises a box body used for placing the device main body, and cooling liquid is arranged in the box body.
Further, a positioning support bottom plate is arranged in the box body, the C-shaped magnetic iron core is embedded on the positioning support bottom plate, and the opening position of the C-shaped magnetic iron core is downward.
Further, the C-shaped magnetic conduction iron core is formed by laminating silicon steel sheets;
and/or the harmonic magnetic field excitation coil and the direct current magnetic field excitation coil are copper coils and are wound on a coil frame of the excitation coil in a coaxial mode and pass through iron core arms parallel to the horizontal plane on the upper side of the C-shaped magnetic conductive iron core.
Further, the superconducting coil is wound by a first-generation high-temperature superconducting tape or a second-generation high-temperature superconducting tape;
and/or the superconducting coil is fixed on a coil frame of the coil to be tested, and a positioning support plate for providing support and positioning functions for the coil frame of the coil to be tested is arranged at the opening position of the C-shaped magnetic conductive iron core.
Furthermore, the input current of the direct current magnetic field excitation coil is direct current, and the direct current is directly input by two direct current sources;
the input current of the harmonic magnetic field excitation coil is sinusoidal alternating current I with frequency f 1 Sinusoidal alternating current I with frequency of 2f 2 Sinusoidal alternating current I with a frequency of 3f 3 The resultant current is generated in a waveform by a signal generator and amplified to a prescribed amplitude via a power amplifier, and finally inputted to the harmonic magnetic field excitation coil.
Further, the width of the cross section of the opening position of the C-shaped magnetic conductive iron core is more than three times of the width of the material to be tested, so that uniformity of a magnetic field acting on the material to be tested is ensured.
In another aspect, a method for testing electromagnetic characteristics of a superconducting coil by using the complex background magnetic field generating device is provided, including:
step 1: inputting a direct current I to a direct current magnetic field excitation coil of one of the C-shaped magnetic conductive iron cores dc1 The current amplitude is increased from a preset minimum threshold value to a preset maximum threshold value according to a preset step length, and meanwhile, a Hall sensor is arranged at a designated test position of the superconducting coil for recording the change of the magnetic induction intensity B and I is carried out dc1 The value and the corresponding B value are recorded in a table for standby;
step 2: carrying out Fourier decomposition on a vertical magnetic field which is required to act on a linear part on one side of the superconducting coil to obtain direct current components, and amplitudes and phases of 1-time, 2-time and 3-time harmonic components;
step 3: assuming that the DC component required to generate a vertical magnetic field is B dc Calculating to obtain the excitation amplitude value B dc Direct current I required by direct current magnetic field of (2) dc ；
Step 4: calculating 1 st harmonic component of the vertical magnetic field to be simulated in the same way as in the step 3Measuring magnetic field B ac1 Magnetic field B of 2 nd harmonic component ac2 And 3 rd harmonic component magnetic field B ac3 The required sinusoidal alternating current I ac1 、I ac2 And I ac3 Amplitude I of (1) 1 、I 2 And I 3 ；
Step 5: using DC current source to supply DC current I dc A direct-current magnetic field excitation coil input into one of the C-shaped magnetic conductive iron cores; generating I using a signal generator ac Waveform I of (1) ac For said sinusoidal alternating current I ac1 、I ac2 And I ac3 The amplitude of the synthesized current is amplified to the required amplitude by a power amplifier, and the synthesized current is input into a harmonic magnetic field excitation coil of the C-shaped magnetic iron core, so that a vertical magnetic field to be simulated can be generated in an opening of the C-shaped magnetic iron core.
Further, the step 5 further includes:
step 6: and (2) repeating the steps (2-5) to generate another vertical magnetic field to be simulated in the opening of the other C-shaped magnetic conductive iron core so as to realize the application of different vertical magnetic fields on two straight line parts of one superconducting coil.
The invention has the following beneficial effects:
according to the complex background magnetic field generating device and the testing method for electromagnetic property testing, a vertical specific magnetic field is generated on one side of the wide surface of the superconducting coil in a current excitation mode, and the complex background magnetic field is used for simulating the complex magnetic field suffered by the superconducting coil in a motor environment, so that the electromagnetic property of the superconducting coil in the motor magnetic field environment is tested, the electromagnetic property evaluation of the superconducting coil can be completed under the condition that a prototype is not manufactured, and reference data can be provided for the design of the superconducting motor. Meanwhile, a controllable background magnetic field can be provided for testing the electromagnetic characteristics of superconducting blocks and short superconducting strips.
Drawings
FIG. 1 is an overall block diagram of a complex background magnetic field generating device for electromagnetic property testing of the present invention;
FIG. 2 is an exploded view of the complex background magnetic field generating device of FIG. 1;
FIG. 3 is a block diagram of the apparatus body of FIG. 1 (with the cooling vessel and positioning support floor removed);
FIG. 4 is a front view of the device body of FIG. 1;
FIG. 5 is a top view of the device body of FIG. 1;
FIG. 6 is a right side view of the device body of FIG. 1;
fig. 7 is a schematic view of the assembly of the core and the positioning support base plate of fig. 1;
fig. 8 is a structural view of the core of fig. 1;
FIG. 9 is a block diagram of a sample superconducting coil of FIG. 1;
FIG. 10 is a block diagram of the excitation coil of FIG. 1;
fig. 11 is a somewhat dimensional representation of the main body portion of the device of fig. 1.
Reference numerals: 1. the magnetic core comprises a box body, 2, a positioning support bottom plate, 3, C-shaped magnetic cores I,4, C-shaped magnetic cores II,5, harmonic magnetic field excitation coils I,501, direct current magnetic field excitation coils I,502, coil frames I,503 of excitation coils, stainless steel M3 bolts, 504, stainless steel M3 nuts, 6, harmonic magnetic field excitation coils II,601, direct current magnetic field excitation coils II,7, a superconducting coil (coil to be tested), 701, a coil frame of the coil to be tested, 702, a positioning support plate of the coil to be tested, 8, a gap between two C-shaped magnetic cores, s1, positioning slots I, s2, positioning slots II, s3, positioning slots III, e1, positioning edges I, e2, core positioning edges II, e3, core positioning edges III, e4, core positioning edges IV, p1, core insertion positioning slot areas I, p2, core insertion positioning slot areas II, p3, core insertion positioning slot areas III, p4 and core insertion positioning slot areas IV.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
For purposes of describing the present invention in detail, an x-y-z reference frame is established without loss of generality, wherein the x-o-y plane is considered to be a horizontal plane, wherein the positive side of the x-axis is defined as the front side, the negative side of the x-axis is defined as the rear side, the positive side of the y-axis is defined as the right side, the negative side of the y-axis is defined as the left side, the z-axis is perpendicular to the x-o-y plane, the positive side of the z-axis is defined as the upper side, and the negative side of the z-axis is defined as the lower side.
On the one hand, the invention provides a complex background magnetic field generating device for electromagnetic property test, as shown in fig. 1-11, which comprises a device main body, wherein the device main body comprises a C-shaped magnetic iron core, an excitation coil group is wound on the C-shaped magnetic iron core, the excitation coil group comprises a harmonic magnetic field excitation coil and a direct current magnetic field excitation coil, the opening position of the C-shaped magnetic iron core is used for placing a material to be tested, and the material to be tested comprises a superconducting coil, a superconducting bulk material or a superconducting strip short sample.
The excitation coil set is used for generating a complex background magnetic field, the C-shaped magnetic conduction iron core is used for forming a magnetic flux loop, when the electromagnetic induction type superconducting motor is used, the DC magnetic field and the harmonic magnetic field are respectively generated on a material to be tested (such as a superconducting coil) through inputting DC current with controllable amplitude and AC current with controllable amplitude, frequency and initial phase to the excitation coil set, so that the magnetic field environment of the superconducting coil in the superconducting motor is simulated, further electromagnetic characteristic evaluation of the superconducting coil is completed under the condition that a prototype is not manufactured, and referent data is provided for design of the superconducting motor. The invention is mainly used for testing and evaluating the electromagnetic characteristics of the superconducting coil in the initial stage of the design of the superconducting motor, and can also provide a controllable magnetic field environment for the electromagnetic characteristic analysis of superconducting blocks and superconducting strip short samples.
The number of the C-shaped magnetic conductive iron cores can be one, however, in order to more accurately simulate the magnetic field environment where the superconducting coils are positioned in the superconducting motor, preferably, the number of the C-shaped magnetic conductive iron cores is two, the C-shaped magnetic conductive iron cores are symmetrically arranged at intervals, each C-shaped magnetic conductive iron core is wound with the excitation coil group, at the moment, the material to be tested is the superconducting coils, and the superconducting coils are annularly arranged at the opening positions of the two C-shaped magnetic conductive iron cores.
That is, the main components of the device main body include: the C-shaped magnetic conduction iron core I3 and the C-shaped magnetic conduction iron core II 4, wherein an excitation coil group on the C-shaped magnetic conduction iron core I3 comprises a harmonic magnetic field excitation coil I5 and a direct current magnetic field excitation coil I501, an excitation coil group on the C-shaped magnetic conduction iron core II 4 comprises a harmonic magnetic field excitation coil II 6 and a direct current magnetic field excitation coil II 601, and the material to be tested is a superconducting coil (sample) 7.
In this way, by adopting two groups of magnetic field excitation coils and two C-shaped magnetic conductive iron cores to generate different vertical magnetic fields at the straight line parts on two sides of the superconducting coil (coil to be tested), the magnetic field influence of the superconducting coil in the superconducting motor can be simulated more truly.
For cooling the material to be tested, the complex background magnetic field generating device preferably further comprises a box body 1 (specifically, a foam box) for placing the device body, and a cooling liquid (specifically, liquid nitrogen) is arranged in the box body 1. Furthermore, a positioning support bottom plate 2 can be arranged in the box body 1, the C-shaped magnetic iron core is embedded on the positioning support bottom plate 2, and the opening position of the C-shaped magnetic iron core is downward. Thus, the device body is placed in the box body 1 and on the positioning support base plate 2, the box body 1 is used for containing liquid nitrogen and providing a low-temperature environment for the high-temperature superconducting coil, and the positioning support base plate 2 has the functions of dispersing the device pressure and positioning for placing the iron core.
The C-shaped magnetic iron core I3 and the C-shaped magnetic iron core II 4 can be formed by laminating silicon steel sheets, and a proper silicon steel sheet model is selected according to the maximum excitation magnetomotive force of the excitation coil so as to avoid magnetic saturation. The assembly mode shown in fig. 7 can be used for realizing the accurate positioning of two C-shaped magnetic iron cores, wherein s1, s2 and s3 are positioning grooves on the positioning support base plate 2, and the areas p1, p2, p3 and p4 on the lower sides of the C-shaped magnetic iron cores I3 and II 4 are embedded into the positioning grooves during assembly to realize the positioning, wherein four iron core positioning edges e1, e2, e3 and e4 on the C-shaped magnetic iron cores I3 and II 4 are required to be in tight fit with four boundaries of the positioning grooves s1, s2 and s3 to realize the accurate positioning.
In order to reduce the iron loss and heat generation of the C-shaped magnetic conduction iron core, the C-shaped magnetic conduction iron core is manufactured by laminating silicon steel sheets, and can also be manufactured by laminating materials with similar magnetic conduction characteristics with the silicon steel sheets, such as ferronickel (like FeNi 9).
The gap d at the opening position of the C-shaped magnetically permeable core needs to be able to put down the single-sided straight line portion of the superconducting coil 7 and to reserve enough space for the sensor arrangement. Since the lower part of the C-shaped magnetic iron core needs to be soaked in liquid nitrogen, the C-shaped magnetic iron core needs to be made by laminating silicon steel sheets for reducing the consumption of the liquid nitrogen, and the silicon steel sheet model with proper B-H curve inflection points is selected according to the required excitation magnetomotive force.
The harmonic magnetic field excitation coil and the direct current magnetic field excitation coil can be copper coils (without connection relation) and are wound on a coil frame of the excitation coil in a coaxial mode, and pass through iron core arms parallel to the horizontal plane on the upper side of the C-shaped magnetic conduction iron core. That is, the harmonic magnetic field excitation coil I5, the dc magnetic field excitation coil I501, the harmonic magnetic field excitation coil II 6, and the dc magnetic field excitation coil II 601 may be copper coils, wherein the harmonic magnetic field excitation coil I5 and the dc magnetic field excitation coil I501 are wound on a bobbin I502 of the excitation coil in a coaxial form and pass through an upper parallel-to-plane core arm of the C-shaped magnetically permeable core I3 on the right side for generating a vertical magnetic field acting on a right straight portion of the superconducting coil 7. Correspondingly, the harmonic magnetic field excitation coil II 6 and the direct current magnetic field excitation coil II 601 are wound on the coil frame of the corresponding excitation coil in a coaxial manner, and pass through the upper core arm parallel to the plane of the left C-shaped magnetic conductive core II 4, so as to generate a vertical magnetic field acting on the left straight line portion of the superconducting coil 7.
Referring to fig. 11, the gap 8 between the C-shaped magnetically permeable core I3 and the C-shaped magnetically permeable core II 4 needs to satisfy the following condition: d, d c Is large enough to ensure that no flux interference occurs between the two C-shaped magnetically permeable cores. And the width w of each C-shaped magnetically permeable core needs to be large enough to ensure thatThe magnetic field excitation coil is provided on the core arm. And the height h of each C-shaped magnetically permeable core needs to be large enough to ensure that there is sufficient liquid nitrogen capacity and liquid nitrogen level does not reach the bottommost end of the magnetic field excitation coil when liquid nitrogen bath cooling is performed.
Core arm width w of C-shaped magnetic conductive core 1 It needs to be large enough to ensure that no magnetic saturation occurs in the core. Section width w of two C-shaped magnetically permeable cores adjacent to superconducting coil 7 (coil to be measured) 2 Needs to be large enough to improve the uniformity of the vertical magnetic field, in the present invention, the width w of the cross section at the opening position of the C-shaped magnetically permeable core 2 Preferably more than three times the width of the material to be tested, such as superconducting coil 7, to achieve a vertical magnetic field homogeneity of more than 99.5%.
The superconducting coil 7 (coil to be measured) can be wound by a first-generation high-temperature superconducting tape (BSCCO) or a second-generation high-temperature superconducting tape (YBCO) according to experimental requirements, and other superconducting tapes can be selected to be wound according to practical requirements and fixed on a coil frame 701 of the coil to be measured, and a positioning support plate 702 of the coil to be measured is positioned at an opening position of the C-shaped magnetic conductive iron core to provide support and positioning functions for the coil frame 701 of the coil to be measured, so that the position of the coil to be measured in the z-axis direction can be changed by changing the height of the positioning support plate 702. The straight portions on both sides of the superconducting coil 7 (coil to be measured) are placed in the opening gaps of the C-shaped magnetically permeable iron core I3 and the C-shaped magnetically permeable iron core II 4, respectively, and are subjected to a magnetic field perpendicular to the wide surface of the strip.
In the present invention, the superconducting coil 7 (coil to be measured) is cooled by a liquid nitrogen bath, and in the course of performing an electromagnetic property test experiment of the superconducting coil 7, liquid nitrogen is injected into the case 1 shown in fig. 1 and completely submerges the superconducting coil 7. It should be noted that in order to avoid copper loss of the magnetic field excitation coil increasing the liquid nitrogen consumption, the liquid nitrogen level needs to be lower than the bottom of the magnetic field excitation coil.
In addition, the input current of the direct current magnetic field excitation coils (including 501 and 601) is direct current, and can be directly input by two direct current sources; the input current of the harmonic magnetic field excitation coil (including 5 and 6) may be a composite alternating current of a 1 st harmonic current with frequency f, a 2 nd harmonic current with frequency 2f, and a 3 rd harmonic current with frequency 3f, which may be waveform-generated by a signal generator and amplified to a specified amplitude via a power amplifier, and finally input to the harmonic magnetic field excitation coil.
In another aspect, the present invention provides a method for testing electromagnetic properties of a superconducting coil by using the complex background magnetic field generating device, including:
step 1: inputting a direct current I to a direct current magnetic field excitation coil of one of the C-shaped magnetic conductive iron cores dc1 The current amplitude is increased from a preset minimum threshold value to a preset maximum threshold value according to a preset step length, and meanwhile, a Hall sensor is arranged at a designated test position of the superconducting coil for recording the change of the magnetic induction intensity B and I is carried out dc1 The value and the corresponding B value are recorded in a table for standby;
in the specific implementation of this step, the direct current I may be input only to the direct current field excitation coil I501 dc1 The current amplitude increases from 0A by a step size of 0.1A and finally increases to a maximum value of 5A. Meanwhile, a Hall sensor is arranged at a designated test position of the superconducting coil 7 (coil to be tested) for recording the change of the magnetic induction intensity B, and the direct current I input into the direct current magnetic field excitation coil I501 can be used for dc1 And the corresponding magnetic induction intensity B (I dc1 ) The values of (2) are recorded in the table, as in table 1 below.
TABLE 1
| 0.0A | B(0.0A) |
| 0.1A | B(0.1A) |
| 0.2A | B(0.2A) |
| …… | …… |
| 4.9A | B(4.9A) |
| 5.0A | B(5.0A) |
Step 2: carrying out Fourier decomposition on a vertical magnetic field which is required to act on a linear part on one side of the superconducting coil to obtain direct current components, and amplitudes and phases of 1-time, 2-time and 3-time harmonic components;
when this step is carried out, the vertical magnetic field to be simulated, which acts on the right-hand straight portion of the superconducting coil 7, may be subjected to fourier decomposition to obtain the data listed in table 2.
TABLE 2
Step 3: assuming that the DC component required to generate a vertical magnetic field is B dc Calculating to obtain the excitation amplitude value B dc Direct current I required by direct current magnetic field of (2) dc ；
When the step is implemented, the direct current component B of the vertical magnetic field is generated dc For example, through judgment B dc The value of (2) is between B (4.9A) and B (5.0A), then the excitation amplitude is B dc Direct current I required by direct current magnetic field of (2) dc Can be calculated by the following formula (1):
step 4: calculating to obtain a 1 st harmonic component magnetic field B exciting a vertical magnetic field to be simulated in the same way as in the step 3 ac1 Magnetic field B of 2 nd harmonic component ac2 And 3 rd harmonic component magnetic field B ac3 The required sinusoidal alternating current I ac1 、I ac2 And I ac3 Amplitude I of (1) 1 、I 2 And I 3 ；
Thus far, the characteristic parameters of the excitation current for synthesizing the vertical magnetic field to be simulated have been obtained by the above steps, as shown in table 3 below.
TABLE 3 Table 3
Step 5: using DC current source to supply DC current I dc A direct-current magnetic field excitation coil input into one of the C-shaped magnetic conductive iron cores; generating I using a signal generator ac Waveform I of (1) ac For said sinusoidal alternating current I ac1 、I ac2 And I ac3 The amplitude of the synthesized current is amplified to the required amplitude by a power amplifier, and the synthesized current is input into a harmonic magnetic field excitation coil of the C-shaped magnetic iron core, so that a vertical magnetic field to be simulated can be generated in an opening of the C-shaped magnetic iron core.
When the step is implemented, a direct current source can be utilized to drive the direct current I dc Inputting a direct-current magnetic field excitation coil I501; generating I using a signal generator ac Waveform I of (1) ac For said sinusoidal alternating current I ac1 、I ac2 And I ac3 And amplifying the amplitude of the synthesized current by a power amplifier to the amplitude value obtained by calculation in the step 4, inputting a harmonic magnetic field excitation coil I5, and generating a vertical magnetic field to be simulated at the right straight line part of the superconducting coil 7.
For better simulating the real environment, the step 5 may further include:
step 6: and (2) repeating the steps (2-5) to generate another vertical magnetic field to be simulated in the opening of the other C-shaped magnetic conductive iron core so as to realize the application of different vertical magnetic fields on two straight line parts of one superconducting coil.
When the step is specifically implemented, the steps 2-5 are repeated, so that a vertical magnetic field to be simulated can be generated at the left straight line part of the superconducting coil 7.
In summary, the complex background magnetic field generating device and the testing method for electromagnetic property testing generate a vertical specific magnetic field on one side of the wide surface of the superconducting coil in a current excitation mode, and are used for simulating the complex magnetic field suffered by the superconducting coil in a motor environment, so that the electromagnetic property of the superconducting coil in the motor magnetic field environment is tested, the electromagnetic property evaluation of the superconducting coil can be completed under the condition that a prototype is not manufactured, and referent data are provided for the design of the superconducting motor.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (7)
1. The method for testing electromagnetic characteristics of the superconducting coil by utilizing the complex background magnetic field generating device is characterized by comprising a device main body, wherein the device main body comprises two C-shaped magnetic iron cores which are symmetrically arranged at intervals, each C-shaped magnetic iron core is wound with an excitation coil group, each excitation coil group comprises a harmonic magnetic field excitation coil and a direct current magnetic field excitation coil, and the superconducting coils are annularly arranged at the opening positions of the two C-shaped magnetic iron cores;
the method comprises the following steps:
step 1: direct current is input to a direct current magnetic field excitation coil of one C-shaped magnetic conduction iron coreI dc1 The current amplitude is increased from a preset minimum threshold to a preset maximum threshold according to a preset step length, and meanwhile, the current amplitude is set at a designated test position of the superconducting coilHall sensor is used for recording magnetic induction intensityBAnd willI dc1 Value and correspondingBThe values are recorded in a table for later use;
step 2: carrying out Fourier decomposition on a vertical magnetic field which is required to act on a linear part on one side of the superconducting coil to obtain direct current components, and amplitudes and phases of 1-time, 2-time and 3-time harmonic components;
step 3: assuming that the direct current component required to generate the vertical magnetic field isB dc Calculating to obtain the excitation amplitude value asB dc Direct current required by direct current magnetic field of (2)I dc ；
Step 4: calculating to obtain a 1 st harmonic component magnetic field which excites a vertical magnetic field to be simulated in the same way as in the step 3B ac1 Magnetic field of 2 nd harmonic componentB ac2 And 3 rd harmonic component magnetic fieldB ac3 The required sinusoidal alternating currentI ac1 、I ac2 AndI ac3 amplitude of (a) of (b)I 1 、I 2 AndI 3 ；
step 5: direct current source is used for leading direct currentI dc A direct-current magnetic field excitation coil input into one of the C-shaped magnetic conductive iron cores; using signal generators to generateI ac Is provided with a waveform of (a),I ac for said sinusoidal alternating currentI ac1 、I ac2 AndI ac3 the amplitude of the synthesized current is amplified to the required amplitude by a power amplifier, and the synthesized current is input into a harmonic magnetic field excitation coil of the C-shaped magnetic iron core, so that a vertical magnetic field to be simulated can be generated in an opening of the C-shaped magnetic iron core.
2. The method of claim 1, wherein the complex background magnetic field generating device further comprises a housing for housing the device body, the housing having a cooling fluid disposed therein.
3. The method of claim 2, wherein a positioning support base plate is disposed in the box body, the C-shaped magnetically permeable core is embedded on the positioning support base plate, and an opening position of the C-shaped magnetically permeable core is downward.
4. The method of claim 1, wherein the C-shaped magnetically permeable core is laminated from sheet silicon steel;
and/or the harmonic magnetic field excitation coil and the direct current magnetic field excitation coil are copper coils and are wound on a coil frame of the excitation coil in a coaxial mode and pass through iron core arms parallel to the horizontal plane on the upper side of the C-shaped magnetic conductive iron core.
5. The method of claim 1, wherein the superconducting coil is wound from a first generation high temperature superconducting tape or a second generation high temperature superconducting tape;
and/or the superconducting coil is fixed on a coil frame of the coil to be tested, and a positioning support plate for providing support and positioning functions for the coil frame of the coil to be tested is arranged at the opening position of the C-shaped magnetic conductive iron core.
6. The method according to claim 1, wherein the width of the cross section at the opening position of the C-shaped magnetically permeable core is three times or more the width of the material to be tested, so as to ensure uniformity of the magnetic field acting on the material to be tested.
7. The method according to claim 1, wherein the step 5 further comprises, after:
step 6: and (2) repeating the steps (2-5) to generate another vertical magnetic field to be simulated in the opening of the other C-shaped magnetic conductive iron core so as to realize the application of different vertical magnetic fields on two straight line parts of one superconducting coil.
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| CN108152766A (en) * | 2018-01-04 | 2018-06-12 | 北京交通大学 | A kind of superconducting tape magnetizing assembly |
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| CN108152766A (en) * | 2018-01-04 | 2018-06-12 | 北京交通大学 | A kind of superconducting tape magnetizing assembly |
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