Harmonic magnetic field simulation device for testing the properties of superconducting magnets

Abstract

This invention discloses a harmonic magnetic field simulation device for testing the characteristics of superconducting magnets, relating to electrical and mechanical transmission equipment. It includes a support frame and a superconducting magnet module mounted on the support frame, a ferromagnetic tuning module mounted below the superconducting magnet module, and a magnetomotive force source module mounted below the ferromagnetic tuning module. An upper back iron is disposed above the superconducting magnet module. A first characteristic air gap exists between the superconducting magnet module and the ferromagnetic tuning module, and a second characteristic air gap exists between the ferromagnetic tuning module and the magnetomotive force source module. The ferromagnetic tuning module is mounted on a moving device. This invention can conveniently simulate the magnetic fields within different superconducting motors, making its principle intuitive, its applicability wide, and its simulated magnetic field closer to the actual magnetic field of the superconducting magnet. The experimental results are direct, facilitating research on the current-carrying capacity testing, loss analysis, and electromagnetic shielding analysis of superconducting magnets under specific magnetic field environments.

Description

Technical Field

[0001] This invention discloses a harmonic magnetic field simulation device for testing the characteristics of superconducting magnets, and more specifically, a harmonic magnetic field simulation device for testing the characteristics of modular magnets for superconducting motors. It relates to electrical and mechanical transmission equipment and belongs to the technical field of power generation, transformation or distribution. Background Technology

[0002] With the development of superconducting application technology, especially the emergence of superconducting tapes (or wires) in different temperature ranges (high temperature, medium low temperature, low temperature) and the progress of refrigeration technology, the strong current carrying capacity and low resistance loss characteristics of superconducting materials have attracted the attention of electrical engineers. In recent years, superconducting magnets have been playing an increasingly important role in fields or industries such as electromechanical, medical, military, and large equipment.

[0003] Superconducting motors, as a new type of motor with high power density and excellent performance, are emerging as a new candidate for industrial drive motors, following asynchronous motors, doubly-fed motors, and permanent magnet motors. Globally, the United States, the European Union, Japan, the United Kingdom, Germany, and China are at the forefront of exploring this hot topic, with concepts, prototypes, and test reports of superconducting motors of different power levels, topologies, and application scenarios appearing one after another. However, superconducting motors have not yet achieved large-scale mature application, and most fields and industries still hold a wait-and-see attitude towards this new product. One very important reason is the high cost and uncontrollable reliability of superconducting motors, as well as the high difficulty in designing, optimizing, and analyzing the performance of superconducting motors (mainly superconducting magnets). Specifically, because superconducting motors use superconducting magnets as excitation components, and the stable operation of superconducting magnets depends on a stable low-temperature environment, the overall price of superconducting magnets is still higher than that of permanent magnets and electrically excited magnets. At the same time, traditional superconducting motor solutions use rotor superconducting excitation or stator superconducting excitation, which necessitates the introduction of complex and expensive devices such as torque tubes, cryogenic couplers, brushes, and slip rings. In addition, the superconducting wire has not yet formed a mature production and after-sales market, resulting in the high price of superconducting motors, which seriously affects the market application of this type of motor.

[0004] To address the numerous problems faced by traditional rotor or stator superconducting excitation, the inventors' team innovatively proposed the concept of a statically sealable superconducting motor in their previous research. This technology has been detailed in their patents: "A Static-Sealed High-Temperature Superconducting Motor with Self-Preventing Superconductivity Loss (Patent No.: ZL2017109736584)," "A Low-Temperature Cooling System for a High-Temperature Superconducting Excitation Flux Switching Motor (Patent No.: ZL201310467839.1)," and "A Novel Static-Sealed High-Temperature Superconducting Excitation Flux Switching Motor (Patent No.: ZL201610814189.7)." These technologies overcome the drawbacks of traditional superconducting motor solutions, bringing superconducting motors closer to marketization and practical application, and attracting the interest and attention of researchers both domestically and internationally.

[0005] Regarding the reliability of superconducting motors (superconducting magnets), the operating current of superconducting magnets is affected by factors such as magnetic field strength and operating temperature, which are difficult to accurately characterize using mathematical formulas. Especially after superconducting materials are used to fabricate superconducting magnets and then placed inside superconducting motors, the complex motion and unique electromagnetic environment make it difficult to fully understand the operating characteristics of superconducting magnets. This increases the difficulty of loss analysis, electromagnetic shielding design, and quench mechanism elucidation. Therefore, accurately analyzing the characteristics of superconducting magnets (such as current-carrying characteristics, loss distribution characteristics, and multi-physics coupling characteristics) is a crucial step in improving the reliability of superconducting magnets and a key step in promoting the commercial application of superconducting magnets and superconducting devices.

[0006] To accurately analyze the properties of superconducting magnets, scholars and technicians both domestically and internationally primarily employ empirical formulas and finite element method (FEM) software. While these techniques have yielded promising results, significant problems remain: 1) Empirical formulas have limited applicability and rely on a finite number of experimental data points, making them difficult to directly apply to superconducting magnets with complex structures or novel materials. Furthermore, when the electromagnetic environment surrounding the superconducting magnet is complex, this method suffers from substantial computational errors. 2) While the FEM can realistically simulate different structures or materials and complex electromagnetic environments, its long computational cycle, high convergence difficulty, and challenging modeling present primary challenges for researchers. Moreover, FEM models struggle to accurately simulate actual superconducting magnet models, making it difficult to account for the true properties of each component. Consequently, computational accuracy is hard to guarantee, and simulation data is difficult to directly apply to production practice. To overcome the shortcomings of traditional methods, employing specialized devices to simulate the magnetic field environment of components and subsequently study the properties of superconducting magnets has become a new research approach.

[0007] Chinese invention patent (authorization announcement number CN115169202B) discloses an equivalent magnetic field simulator for a rotating component and its design method. This simulator designs an equivalent magnetic field simulator control circuit based on the magnetic field characteristics obtained from sensors measuring the magnetic field of the rotating component, and performs electromagnetic characteristic simulation calculations of the equivalent magnetic field simulator for the rotating component. This allows the sensors originally used to measure the magnetic field of the rotating component to experience magnetic field changes almost identical to those experienced by the actual rotating component. This method aims to solve the technical problems of existing rotating velocities, but it relies on commercial finite element software such as Maxwell for accurate preliminary modeling and magnetic field analysis to extract the main characteristics of the target magnetic field, thus limiting its application scope. Chinese invention patent (authorization announcement number CN104260907B) discloses a magnetic field simulation system for plasma environment simulation experiments. This system provides a magnetic field signal with controllable magnitude and direction for plasma environment simulation systems, but its application is limited to plasma environments, also resulting in a limited application scope. Chinese invention patent (publication number CN102916551A) discloses a device for simulating the internal magnetic field of a brushless DC motor. The device attaches four magnets to a magnetic steel base according to the distribution of the internal magnetic field of the motor, with the N and S pole magnetic fields arranged alternately to simulate the internal magnetic field of the brushless DC motor and thus provide a magnetic field signal to the Hall element. However, the device has essentially deviated from the essence of the magnetic field model and is a reconfiguration of the magnetic poles to meet the detection needs of the Hall element, which increases the complexity of the motor rotor. Therefore, this patent was not granted after publication. Summary of the Invention

[0008] Based on existing technologies, it can be found that there is still a lack of research and application results in the field of harmonic magnetic field simulation devices for superconducting magnet modules used in superconducting motors. The purpose of this invention is to address the shortcomings of the aforementioned background technology by providing a harmonic magnetic field simulation device for testing the characteristics of superconducting magnets. This device can apply an external magnetic field of specific amplitude and frequency to the superconducting magnet, simulate the air gap magnetic field modulation mechanism of a field-modulated motor, and generate an external magnetic field with specific harmonic content. This simplifies the testing process of electromagnetic and thermal characteristics such as AC loss and critical current of superconducting magnet modules used in superconducting motors, and allows for precise control of superconducting magnet performance before prototype manufacturing.

[0009] This invention includes a support frame and a superconducting magnet module mounted on the support frame, a ferromagnetic tuning module mounted below the superconducting magnet module, and a magnetomotive force source module mounted below the ferromagnetic tuning module; an upper back iron is disposed above the superconducting magnet module; a first characteristic air gap is provided between the superconducting magnet module and the ferromagnetic tuning module, and a second characteristic air gap is provided between the ferromagnetic tuning module and the magnetomotive force source module; wherein:

[0010] The superconducting magnet module includes a housing, a superconducting coil disposed inside the housing, and electrical signal conduits disposed on the housing; the superconducting coil is wound around at least a portion of the upper back iron;

[0011] The ferromagnetic tuning module is mounted on the mobile device.

[0012] Furthermore, the main body of the superconducting magnet module is annular; the superconducting magnet module includes its outer shell and an inner Dewar inside the outer shell, the superconducting coil is disposed in the inner Dewar, the inner cavity of the inner Dewar is connected to the cooling pipe and the electrical signal pipe, and the superconducting coil outputs an electrical signal through the electrical signal pipe; the space between the outer shell and the inner Dewar is connected to the vacuum tube on the outer shell; the inner Dewar and the outer shell form an annular shape, and the superconducting coil is disposed in the annular shape; two long slots are provided on the lower surface of the upper back iron, and two sections of the annular part of the superconducting magnet module are respectively located in the two long slots of the upper back iron.

[0013] Furthermore, the part of the ferromagnetic tuning module that plays a major role in the superconducting coil is parallel to the plane formed by the superconducting coil.

[0014] Furthermore, the ferromagnetic tuning module includes a set of parallel ferromagnetic tuning blocks, and its moving device includes chains that are respectively connected to the front and rear ends of each ferromagnetic tuning block. The chains cooperate with a set of sprockets, and the sprocket shafts are mounted on a bracket. One of the sprocket shafts is connected to the shaft of a motor. The upper part of the ferromagnetic tuning module is located between the superconducting magnet module and the magnetomotive force source module, and the lower part of the ferromagnetic tuning module is located below the magnetomotive force source module.

[0015] Furthermore, the ferromagnetic adjustment module and the upper back iron are mounted on the left and right columns of the support, respectively, and the upper back iron is connected to the left and right columns by the left and right support brackets of the back iron through a height adjustment mechanism.

[0016] Furthermore, the height adjustment mechanism is as follows: the inner ends of the left and right supports of the back iron are fixedly connected to the upper back iron, and their outer ends are respectively fitted onto the left and right columns through the left and right support fastening sleeves, and are respectively fixed onto the left and right columns by bolts and nuts passing through the left and right support fastening sleeves from the inside to the outside.

[0017] Furthermore, the magnetomotive force source module includes a lower back iron, the upper surface of which is provided with a set of upwardly protruding ridges, each ridge being surrounded by a wire winding.

[0018] Furthermore, a vertical adjustment mechanism is provided in the middle of the support, and the magnetomotive force source module is fixed on the base plate, which is connected to the vertical adjustment mechanism.

[0019] Furthermore, the four corner columns of the support are respectively provided with inwardly protruding lifting platforms, and the two opposite front and rear lifting platforms are provided with corresponding longitudinal grooves. The base plate fasteners (604) at the four corners of the base plate pass through each longitudinal groove to connect the base plate to the lifting platform.

[0020] This invention can conveniently simulate the magnetic fields inside different superconducting motors, making its principle intuitive, its application range wide, its simulated magnetic field closer to the actual magnetic field of the superconducting magnet, and its experimental results direct. It is beneficial to realize research such as testing the current carrying capacity, loss analysis, and electromagnetic shielding analysis of superconducting magnets under specific magnetic field environments. Attached Figure Description

[0021] Figure 1 This is a perspective view of an embodiment of the present invention;

[0022] Figure 2 This is a front view of an embodiment of the present invention;

[0023] Figure 3 This is a top view of an embodiment of the present invention;

[0024] Figure 4 This is a right view of an embodiment of the present invention;

[0025] Figure 5 This is a cross-sectional view of the superconducting magnet module according to an embodiment of the present invention;

[0026] Figure 6 This is a perspective view of the ferromagnetic tuning unit in an embodiment of the present invention;

[0027] Figure 7 This is a top view of the ferromagnetic tuning unit in an embodiment of the present invention;

[0028] Figure 8 This is a perspective view of the ferromagnetic tuning unit after it has been removed in an embodiment of the present invention;

[0029] Figure 9 This is an exploded view of a harmonic magnetic field simulation device for testing the characteristics of superconducting magnets, after concealing the ferromagnetic support, magnet adjustment unit, power motor, and transmission belt.

[0030] The components include: 1. Superconducting magnet module; 101. Electrical signal piping; 102. Cooling piping; 103. Vacuum piping; 104. Main magnet; 1041. Outer shell; 1042. Superconducting coil; 1043. Inner Dewar; 2. Support structure; 201. Left side support of the back iron; 202. Left side support fastener; 203. Left side column; 204. Right side support of the back iron; 205. Left side support fastening sleeve; 3. Upper back iron; 301. Superconducting magnet back iron. 302. Back iron fixing plate; 4. Transmission mechanism; 401. Chain; 402. Sprocket; 403. Sprocket shaft; 5. Ferromagnetic adjustment module; 501. Ferromagnetic adjustment block; 502. Side column; 503. End support; 6. Magnetomotive force source module; 601. Winding; 602. Lower back iron; 603. Base plate; 604. Base plate fastener; 7. Lifting platform; 8. Motor; 9. Belt; a1. First characteristic air gap; a2. Second characteristic air gap. Implementation

[0031] As shown in the figure, this embodiment mainly consists of a superconducting magnet module 1, a support 2, an upper back iron 3, a ferromagnetic magnet adjustment module 5, a transmission mechanism 4 for the ferromagnetic magnet adjustment block, a magnetomotive force source module 6, and a motor 8. Specifically, the superconducting magnet module 1 is located above the support 2, the ferromagnetic magnet adjustment module 5 is located on the upper part of the support 2, and the magnetomotive force source module 6 is located in the middle of the support 2.

[0032] In this embodiment, the support 2 is a frame structure, with a left column 203 and a right column respectively located on its upper sides. The upper back iron 3 is located above the support 2 and is connected to the left column 203 and the right column respectively through the left support 201 and the right support 204 of the back iron on both sides. The connection structure between the upper back iron 3 and the left column 203 and the right column is symmetrical. Here, the left connection structure is used as an example for explanation:

[0033] The left side bracket 201 of the back iron is Y-shaped, with an opening at its right end (i.e., its inner end). The front and rear sides of this opening are respectively located in front of and behind the upper back iron 3, and are connected to the upper back iron 3 by bolts. The left end (i.e., its outer end) of the left side bracket 201 is a square tube structure, which forms the left side bracket fastening sleeve 205. The left side bracket fastening sleeve 205 is fitted onto the left side column 203 and fastened to the left side column 203 by the left side bracket fastener 202. The left side surface of the left side bracket fastening sleeve 205 has a threaded hole. The left side bracket fastener 202 includes a fastening bolt with a knob fixed to its outer end. The fastening bolt is screwed into the threaded hole on the left side bracket fastening sleeve 205 from the outside to the inside, and its inner end rests against the surface of the left side bracket 201. Rotating the knob can fix the left support fastening sleeve 205 to the left column 203, or loosen the fit between them to allow the left support fastening sleeve 205 to move along the left column 203, thereby adjusting the height of the back iron. To increase the friction between the left support fastening sleeve 205 and the left column 203, a rubber pad can be placed at the mating end of the fastening bolt and the left column 203.

[0034] In this embodiment, the upper back iron 3 can be made of magnetic materials and manufacturing techniques such as laminated silicon steel sheets, integral silicon steel, and amorphous alloys, possessing certain mechanical strength and good magnetic permeability. The lower surface of the upper back iron 3 has two elongated slots in the front-to-back direction, and the superconducting magnet module 1 is installed in these slots.

[0035] The main body of the superconducting magnet module 1 in this embodiment is ring-shaped. It is straight in the middle, arc-shaped at one end, and extends at the other end. The extended part first forms a common pipeline for electrical signal pipeline 101 and cooling pipeline 102, and splits into two branches at its tail to form electrical signal pipeline 101 and cooling pipeline 102.

[0036] The superconducting magnet module 1 includes a housing 1041 and an inner Dewar 1043 within the housing 1041. The shapes of the housing 1041 and the inner Dewar 1043 are consistent with the overall shape of the superconducting magnet module 1. The front end of the inner Dewar 1043 extends forward to form the aforementioned electrical signal conduit 101 and cooling conduit 102. The housing 1041 and the inner Dewar 1043 are sealed together and connected to a vacuum conduit 103, the end of which is connected to a vacuum valve. A superconducting coil 1042 is installed in the inner Dewar 1043, and its wires are led out through the electrical signal conduit 101. A connector can also be provided at the port of the electrical signal conduit 101 to facilitate external connection of the superconducting coil 1042. This structure can reduce the influence of the external environment on the superconducting coil 1042 and ensure the accuracy of the data.

[0037] The two straight sections of the annular part of the superconducting magnet module 1 are all embedded in the long groove on the lower surface of the upper back iron 3. A protruding dovetail guide rail is provided on the lower surface of the upper back iron 3 between the two long grooves. A dovetail groove is provided on the back iron fixing plate 302 below the upper back iron 3 and the superconducting magnet module 1. The dovetail groove and the dovetail guide rail on the upper back iron 3 cooperate to fix the superconducting magnet module 1 on the upper back iron 3.

[0038] Lifting platforms 7 extending inwards are provided at the four corners of the upper part of the support 2, and each lifting platform 7 is parallel to the plane formed by the front and rear sides of the support 2. The corresponding lifting platforms 7 on the left and right sides form a group. Taking the left group as an example: the two lifting platforms 7 near the right end are provided with vertical narrow holes with corresponding positions.

[0039] Each lifting platform 7 has two sprocket shafts 403 running vertically and horizontally in the middle, with sprockets 402 mounted on both ends of each shaft 403 via bearings. Thus, two sprocket sets are mounted on the support 2, each consisting of four sprockets 402. Each sprocket set is connected to a ring-shaped chain 401, and one of the sprocket shafts has a driven pulley connected to a driving pulley mounted on the shaft of the motor 8 via a belt 9. In this embodiment, the motor 8 is an adjusting motor, or may employ related technologies such as those found in "A Static Sealed Self-Preventing High-Temperature Superconducting Motor (Patent No.: ZL2017109736584)," "High-Temperature Superconducting Excitation Flux Switching Motor Low-Temperature Cooling System (Patent No.: ZL201310467839.1)," and "A Novel Static Sealed High-Temperature Superconducting Excitation Flux Switching Motor (Patent No.: ZL201610814189.7)."

[0040] In this embodiment, a ferromagnetic adjustment module 5 is provided between the front and rear chains 401. The ferromagnetic adjustment module 5 includes a group of ferromagnetic adjustment blocks 501 installed at intervals along the chain direction. The front and rear ends of each ferromagnetic adjustment block 501 are connected to the shaft of the corresponding chain plate on the chain 401 through a side post 502 on an end support 503. The three components can be independent components, and then fixed into a whole by fasteners, fastening structures, or welding, or they can be integrally formed. The side post 502 on the end support 503 can be made of non-magnetic material, such as stainless steel or aluminum alloy. In this embodiment, based on the setting position of the sprocket shaft 403, the upper and lower parts (i.e., its forward and rotating parts) of the ferromagnetic tuning module 5 are respectively located between the superconducting magnet module 1 and the magnetomotive force source module 6 and below the magnetomotive force source module 6, with gaps left between the three in sequence, thereby forming a first characteristic air gap a1 between the superconducting magnet module 1 and the ferromagnetic tuning module 5, and a second characteristic air gap a2 between the ferromagnetic tuning module 5 and the magnetomotive force source module 6.

[0041] The aforementioned ferromagnetic tuning block 501 is made of magnetically conductive material and can be manufactured using magnetic materials and techniques such as laminated silicon steel sheets, integral silicon steel, and amorphous alloys. It possesses certain mechanical strength and good magnetic permeability. The excellent magnetic permeability refers to the relative permeability of the ferromagnetic tuning block 501 relative to the vacuum permeability. The relative permeability of the ferromagnetic tuning block 501 should be greater than 10, typically 5000~10000. This value should not be construed as a limitation on the ferromagnetic tuning block 501, but rather as a preliminary selection basis for those skilled in the art. The ferromagnetic tuning module 5 is equivalent to the tuning ring rotor in a motor, playing a role in magnetic field modulation. It modulates the rotating armature magnetic field generated by the magnetomotive force source module 6 into a harmonic magnetic field with a specific amplitude and order, and applies it to the superconducting magnet 1 for performance testing of the superconducting magnet.

[0042] There is a gap between two adjacent ferromagnetic tuning modules 5, which facilitates the adjustment of the amplitude and frequency of the harmonic magnetic field.

[0043] In addition, the ferromagnetic magnetizing module 5, at least the ferromagnetic magnetizing blocks 501 at its upper part, are preferably on the same plane or approximately on the same plane. This plane is preferably parallel to the superconducting magnet module 1. The ferromagnetic magnetizing blocks 501 located at the upper or lower part of the ferromagnetic magnetizing module 5 will move to the left or right along the plane under the drive of the motor 8 (or can be considered as moving laterally along the upper plane), and their moving speed is controllable according to the speed adjustment of the motor 8.

[0044] In this embodiment, a base plate 603 is provided at the corresponding space between each lifting platform 7. Connecting portions with through holes are provided at the four corners of the base plate 603, and base plate fasteners 604 are used to mount the base plate 603 onto the lifting platform 7. The base plate fasteners 604 include bolts, which pass through the through holes on each connecting portion and the corresponding narrow holes on the lifting platform 7 and are screwed onto nuts. This structure allows the base plate 603 to adjust its height along the narrow holes.

[0045] In this embodiment, the substrate 603 is a component of the magnetomotive force source module 6. The magnetomotive force source module 6 also includes a lower back iron 602 fixed on the substrate 603. The upper surface of the lower back iron 602 is provided with three protrusions in the front-to-back direction. Each protrusion is surrounded by a winding 601. The portion of each winding 601 located between the protrusions is completely embedded in the groove between the protrusions, that is, the height of each winding 601 should be less than or equal to the height of the protrusion. The lower back iron 602 can be made of magnetic materials and manufacturing techniques such as laminated silicon steel sheets, integral silicon steel, and amorphous alloys, and has certain mechanical strength and good magnetic permeability.

[0046] Each winding 601 generally uses multi-turn insulated copper wire, but multi-turn insulated aluminum wire or superconducting wire can also be used, as long as it is capable of generating an initial magnetomotive force when the designed current is passed through it. The current that is passed through it can be expressed in a general form: ,in This represents the amplitude of the DC current component (in amperes). AC current component amplitude (in A). This corresponds to the frequency of the alternating current component (in Hz). The expression, which represents the phase of the corresponding alternating current component (in rad), is directly related to the harmonic magnetic field to be simulated.

[0047] The main function of the magnetomotive force source module 6 is to provide a magnetomotive force source with time distribution characteristics and spatial distribution characteristics, and the characteristics are controllable. When current is applied, the winding in the magnetomotive force source module 6 can generate an initial magnetic field (which can be called an initial magnetomotive force).

[0048] Because the height of the substrate 603 is adjustable, the relative position and height between the magnetomotive force source module 6 and the ferromagnetic magnetization adjustment module 5 are controllable. This means that operators can flexibly adjust the relative position and height of the two components according to actual needs. This allows for adjustable gaps between the magnetomotive force source module 6 and the ferromagnetic magnetization adjustment module 5 to meet different testing requirements.

[0049] In this embodiment, the back iron is equivalent to the outer stator core in the motor, serving to constrain the magnetic circuit and guide the magnetic lines of force from the back iron back to the magnetomotive force source module 6 to form a closed magnetic circuit. Without the back iron, a large number of magnetic lines of force would not be able to pass through the ferromagnetic tuning module and armature winding according to the expected route, resulting in reduced energy transfer efficiency.

[0050] As described in the above embodiments, the magnetomotive force source module 6 generates the required initial magnetomotive force. This magnetomotive force first passes through the second characteristic air gap a2, then through the moving ferromagnetic tuning module 5, and subsequently through the first characteristic air gap a1, forming the required simulated magnetic field around the superconducting magnet module 1. The initial magnetomotive force remains unchanged after passing through the second characteristic air gap a2. When passing through the moving ferromagnetic tuning module 5, due to the magnetic field modulation effect of this module, the initial magnetomotive force is modulated into a harmonic magnetic field with a specific amplitude and order. The amplitude and order of the harmonic magnetic field can be adjusted by changing the rotation speed of the ferromagnetic tuning module 5. This harmonic magnetic field passes through the first characteristic air gap a1, forming the required simulated magnetic field around the superconducting magnet module 1. The first characteristic air gap a1 remains unchanged and ultimately acts on the superconducting magnet module 1, enabling research on the current-carrying capacity, loss analysis, and electromagnetic shielding analysis of the superconducting magnet module 1 under specific magnetic field environments. It is also known that the first characteristic air gap a1 can be adjusted by the relative positions of the left support 201, left support fastener 202, left column 203, right support 204, right support fastener, and right column. The second characteristic air gap a2 can be adjusted by the substrate fastener 604, substrate 603, and lifting platform 7. Both air gaps directly affect the amplitude of the magnetic field around the superconducting magnet module 1, but have no effect on the frequency of the magnetic field. Since the air gap widths of superconducting motors with different power levels often vary, both air gaps can be adjusted, making it easier to simulate the magnetic fields within different superconducting motors. Therefore, it has the advantages of intuitive principle, wide applicability, simulated magnetic fields that are closer to the actual magnetic field of the superconducting magnet, and direct experimental results.

Claims

1. A harmonic magnetic field simulation device for superconducting magnet property testing, characterized by: It includes a support (2) and a superconducting magnet module (1) installed on the support (2), a ferromagnetic field modulation module (5) installed below the superconducting magnet module (1), and a magnetic motive force source module (6) installed below the ferromagnetic field modulation module (5); an upper back iron (3) is arranged above the superconducting magnet module (1); there is a first characteristic air gap (a1) between the superconducting magnet module (1) and the ferromagnetic field modulation module (5), and a second characteristic air gap (a2) is arranged between the ferromagnetic field modulation module (5) and the magnetic motive force source module (6); wherein: The superconducting magnet module (1) includes its shell (1041), the shell (1041) is provided with a superconducting coil (1042) inside, and the shell (1041) is provided with an electrical signal pipeline (101); the superconducting coil (1042) surrounds at least a part of the upper back iron (3); The ferromagnetic field modulation module (5) is arranged on its transmission mechanism (4); The ferromagnetic field modulation module (5) includes a group of parallel arranged ferromagnetic field modulation blocks (501), and its transmission mechanism includes chains (401) connected with front and rear ends of each ferromagnetic field modulation block (501) respectively, the chains (401) cooperate with a group of sprockets (402), each sprocket shaft (403) is installed on the support (2), and one of the sprocket shafts (403) is connected with a shaft of a motor (8); the upper part of the ferromagnetic field modulation module (5) is located between the superconducting magnet module (1) and the magnetic motive force source module (6), and the lower part of the ferromagnetic field modulation module (5) is located below the magnetic motive force source module (6).

2. The harmonic magnetic field simulation device for superconducting magnet property testing of claim 1, characterized by: The main part of the superconducting magnet module (1) is annular; the superconducting magnet module (1) includes its shell (1041) and an inner dewar (1043) in the shell (1041), the superconducting coil (1042) is arranged in the inner dewar (1043), the inner cavity of the inner dewar (1043) is communicated with a cooling pipeline (102) and the electrical signal pipeline (101), the superconducting coil (1042) outputs electrical signals through the electrical signal pipeline (101); the space between the shell (1041) and the inner dewar (1043) is communicated with a vacuumizing pipe (103) on the shell (1041); the inner dewar (1043) and the shell (1041) constitute an annular shape, and the superconducting coil (1042) is arranged in the annular shape; the lower surface of the upper back iron (3) is provided with two long grooves, and the annular part of the superconducting magnet module (1) has two sections located in the two long grooves of the upper back iron (3) respectively.

3. The harmonic magnetic field simulation device for superconducting magnet characterization of claim 1 or 2, characterized in that: The part of the ferromagnetic field modulation module (5) which mainly acts on the superconducting coil (1042) is parallel to the plane constituted by the superconducting coil (1042).

4. The harmonic magnetic field simulation device for superconducting magnet property test according to claim 1 or 2, characterized in that: The ferromagnetic field modulation module (5) and the upper back iron (3) are arranged on the support (2), the support (2) is provided with a left side column (203) and a right side column arranged on two sides thereof, a back iron left side support (201) and a back iron right side support (204) connect the upper back iron (3) and the left side column (203) and the right side column arranged on two sides thereof through a height adjusting mechanism.

5. The harmonic magnetic field simulation device for superconducting magnet characterization testing of claim 4, characterized in that: The height adjusting mechanism is characterized in that the inner ends of the left back iron side support (201) and the right back iron side support (204) are fixedly connected with the upper back iron (3), the outer ends of the left back iron side support (201) and the right back iron side support (204) are sleeved on the left vertical column (203) and the right vertical column through the left side support fastening sleeve (205) and the right side support fastening sleeve, and the left side support fastening sleeve (205) and the right side support fastening sleeve are fixed on the left vertical column (203) and the right vertical column through the screw and the nut.

6. The harmonic magnetic field simulation device for superconducting magnet property testing of claim 1 or 2, characterized by: The magnetic motive force source module (6) comprises a lower back iron (602), and the upper surface of the lower back iron is provided with a group of protrusions protruding upwards, and each group of protrusions is surrounded by a wire winding.

7. The harmonic magnetic field simulation device for superconducting magnet characterization testing of claim 6, characterized in that: The vertical adjusting mechanism is arranged in the middle of the support (2), the magnetic motive force source module (6) is fixed on the base plate (603), and the base plate (603) is connected with the vertical adjusting mechanism.

8. The harmonic magnetic field simulation device for superconducting magnet characterization testing of claim 7, characterized by: The vertical adjusting mechanism is arranged in the middle of the support (2), the magnetic motive force source module (6) is fixed on the base plate (603), and the base plate (603) is connected with the vertical adjusting mechanism. The vertical adjusting mechanism is arranged in the middle of the support (2), the magnetic motive force source module (6) is fixed on the base plate (603), and the base plate (603) is connected with the vertical adjusting mechanism.

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