Combined coil magnetic field testing tool and measuring system

Abstract

The invention provides a combined coil magnetic field test tool and a measurement system, relates to the technical field of magnetic field measurement, and aims to solve the problems of low positioning precision, low operation efficiency and insufficient stability of existing coil magnetic field measurement. The test tool comprises a mobile platform, a coil mounting platform, a Hall probe and a combined coil to be tested, and is also provided with a three-axis adjusting mechanism, a coil limiting assembly and a height adjusting assembly, the three-axis adjusting mechanism drives the Hall probe to accurately move to a designated measuring point in a three-dimensional space, the coil limiting assembly fixes the combined coil to be measured to avoid displacement, and the height adjusting assembly adapts to different measuring height requirements. The measuring system comprises the testing tool and an upper computer control module. The device is high in positioning precision, convenient to operate and high in stability, can realize automatic and high-precision measurement of the magnetic field of the combined coil, meets the test requirements of multi-size combined coils, and remarkably improves the measurement efficiency and the data reliability.

Description

Technical Field

[0001] This invention relates to the field of magnetic field measurement technology, and more specifically, to a combined coil magnetic field testing fixture and measurement system. Background Technology

[0002] In fields such as power electronics, electromagnetic compatibility, and aerospace, combined coils are widely used in core equipment such as transformers, sensors, and electromagnetic actuators due to their ability to flexibly adjust the magnetic field distribution. The magnetic field distribution characteristics of combined coils directly determine the performance parameters of the equipment; therefore, accurate and efficient magnetic field measurement is a crucial step in product development, performance verification, and quality control.

[0003] Currently, the measurement of magnetic fields of combined coils mainly relies on traditional manual measurement or simple tooling, which has several prominent problems: First, the positioning accuracy is low. Traditional measurement often involves manually moving the Hall probe by hand, which is subject to human error, resulting in millimeter-level deviations in the position of the measurement point. This cannot meet the requirements of precision measurement, and it is difficult to ensure that the Hall probe is perpendicularly aligned with the magnetic field direction, leading to distorted measurement data. Second, the operation efficiency is low. Combined coils require a large number of measurement points with complex distribution. Manual measurement point by point is not only time-consuming and laborious, but also has a cumbersome measurement process. A single measurement often takes several hours or even days, which seriously restricts the progress of research and development and production. Third, the stability is insufficient. During manual measurement, the probe is easily affected by factors such as vibration and hand tremors, resulting in large dispersion of data from multiple measurements of the same measurement point. In addition, simple tooling lacks a reliable coil fixing structure, and the coil is prone to displacement during measurement, further aggravating data fluctuations. Therefore, it is urgent to design a magnetic field testing scheme specifically for combined coils to solve the core pain points of existing measurement technologies. Summary of the Invention

[0004] The present invention aims to solve the problems of low positioning accuracy, low operating efficiency and insufficient stability of existing coil magnetic field measurement.

[0005] To address the aforementioned problems, this invention provides a combined coil magnetic field testing fixture, comprising a moving platform, a coil mounting platform, a Hall probe, and a combined coil to be tested. The moving platform has a support base fixedly mounted on its bottom. The fixture also includes: a three-axis adjustment mechanism disposed on the upper surface of the moving platform, used to move the Hall probe in three-dimensional space to a designated measurement point of the combined coil to be tested; a coil limiting component disposed above the coil mounting platform, used to fix the combined coil to be tested; and a height adjustment component disposed between the coil mounting platform and the coil limiting component, used to adjust the height of the coil limiting component.

[0006] The present invention provides a combined coil magnetic field testing fixture, which, compared with the prior art, has the following beneficial effects, but is not limited to: To address the issues of low positioning accuracy, low operational efficiency, and insufficient stability in existing coil magnetic field measurement systems, this fixture features a horizontally positioned moving platform with a support base fixed at the four corners and center for stability. A three-axis adjustment mechanism is mounted on the upper surface of the moving platform, and a Hall effect probe is fixed to the end of the mechanism via a control component. A coil mounting platform is located on one side of the moving platform, with a height adjustment component fixed to it and a coil limiting component mounted on top. The combined coil to be tested is placed within the limiting component. During testing, the height of the limiting component is adjusted using the height adjustment component to position the coil at the appropriate measurement location. The limiting component secures the coil, preventing displacement. The three-axis adjustment mechanism moves the Hall effect probe in three-dimensional space, precisely reaching the designated measurement point, thus completing the magnetic field measurement and data acquisition. The equipment exhibits good overall stability and is free from vibration interference. The coordinated operation of all components ensures a smooth measurement process, meeting the requirements for precision measurement and providing superior performance.

[0007] Furthermore, the three-axis adjustment mechanism includes an X-axis slide rail fixedly mounted on the upper surface of the mobile platform, and an X-axis slide plate slidably mounted on the outer side of the X-axis slide rail. A Y-axis slide rail is fixedly mounted on the upper surface of the X-axis slide plate, and a Y-axis slide plate is slidably mounted on the outer side of the Y-axis slide rail. A Z-axis slide rail is fixedly mounted on one outer wall of the Y-axis slide plate, and a Z-axis slide plate is slidably mounted on the outer side of the Z-axis slide rail. An adjustment component is provided on the outer wall of the Z-axis slide plate, and a Hall probe is located at the end of the adjustment component.

[0008] Furthermore, the control component includes a mounting base fixedly installed on one side of the Z-axis slide plate, and a telescopic rod is rotatably connected to the outer wall of the mounting base near the coil limiting component. The Hall probe is fixedly installed at the end of the telescopic rod.

[0009] Furthermore, the height adjustment assembly includes a screw jack fixedly installed on the upper surface of the coil mounting platform, a lifting platform fixedly installed at the top of the screw jack, and a shim fixedly installed on the upper surface of the lifting platform, and the coil limiting assembly fixedly installed above the shim.

[0010] Furthermore, the coil limiting assembly includes a test fixture base disposed on the upper surface of the shim block, with clamping blocks fixedly installed around the test fixture base, and the bottom of the clamping blocks being fixedly connected to the surface of the shim block by bolts. A coil fixing fixture is fixedly installed above the test fixture base, and the combined coil to be tested is disposed in the coil fixing fixture.

[0011] Furthermore, the combined coil to be tested includes multiple concentric coils of different sizes. The outer wall of the coil fixing fixture has multiple concentric annular grooves that match the coils, and the coils are located in the annular grooves. The outer wall of the coil fixing fixture is also fixedly mounted with a coil pressure plate by bolts, and the coils are located between the coil pressure plate and the coil fixing fixture.

[0012] Furthermore, an installation opening is provided at the center of the outer wall of the coil fixing fixture, and a center alignment fixture is fitted into the installation opening. A center positioning hole is provided at the center of the outer wall of the center alignment fixture.

[0013] Furthermore, the outer wall of the coil fixing fixture is also provided with a pick-and-place groove that intersects with the annular groove, and the depth of the pick-and-place groove is greater than the depth of the annular groove.

[0014] The present invention also provides a combined coil magnetic field measurement system, comprising: a combined coil magnetic field testing fixture as described above; and a host computer control module, wherein the host computer control module is used to control the testing fixture to perform measurement actions and to collect and store measurement data.

[0015] Furthermore, the host computer control module has built-in measurement software programmed with LabVIEW, which supports measurement point path planning, real-time display of position coordinates and magnetic field data, automatic storage and export of data, and generation of magnetic field distribution curves and three-dimensional cloud maps. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a combined coil magnetic field testing fixture according to an embodiment of the present invention; Figure 2 This is an enlarged structural schematic diagram of the coil limiting component in a combined coil magnetic field testing fixture according to an embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures: 1. Moving platform; 11. Support base; 2. Coil mounting platform; 3. Three-axis adjustment mechanism; 31. X-axis slide rail; 32. X-axis slide plate; 33. Y-axis slide rail; 34. Y-axis slide plate; 35. Z-axis slide rail; 36. Z-axis slide plate; 4. Control component; 41. Mounting base; 42. Telescopic rod; 5. Hall probe; 6. Height adjustment component; 61. Screw jack; 62. Lifting platform; 63. Elevating block; 7. Coil limiting component; 71. Test fixture base; 72. Clamping block; 73. Coil fixing fixture; 74. Pick-and-place slot; 75. Coil pressure plate; 76. Centering fixture; 8. Combined coil to be tested. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings showing multiple embodiments according to this application. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort will fall within the scope of protection of this application.

[0019] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "including," "having," "containing," etc., in the description, claims, and accompanying drawings of this application are open-ended terms. Therefore, "comprising," "including," or "having" refers to, for example, a method or apparatus having one or more steps or elements, but is not limited to having only these one or more elements. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] Furthermore, in the attached diagram, the X-axis represents the horizontal direction, that is, the left and right position, and the positive direction of the X-axis (that is, the direction the arrow points to) represents the right, and the negative direction of the X-axis (that is, the direction opposite to the positive direction of the X-axis) represents the left; in the attached diagram, the Y-axis represents the vertical direction, that is, the front and back position, and the positive direction of the Y-axis (that is, the direction the arrow points to) represents the front, and the negative direction of the Y-axis (that is, the direction opposite to the positive direction of the Y-axis) represents the back; in the attached diagram, the Z-axis represents the vertical direction, that is, the up and down position, and the positive direction of the Z-axis (that is, the direction the arrow points to) represents the up, and the negative direction of the Z-axis (that is, the direction opposite to the positive direction of the Z-axis) represents the down.

[0022] It should also be noted that the meanings of the aforementioned X-axis, Y-axis and Z-axis are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] It should be emphasized that when the term "comprising / including" is used in this specification, it is used to explicitly indicate the presence of the stated feature, integer, step, or component, but does not exclude the presence or addition of one or more other features, integers, steps, components, or groups of features, integers, steps, or components.

[0025] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0026] See Figures 1-2An embodiment of the present invention provides a combined coil magnetic field testing fixture, comprising a moving platform 1, a coil mounting platform 2, a Hall probe 5, and a combined coil 8 to be tested. The bottom of the moving platform 1 is fixedly mounted with a support base 11. The fixture also includes: a three-axis adjustment mechanism 3, disposed on the upper surface of the moving platform 1, for moving the Hall probe 5 in three-dimensional space to a designated measuring point of the combined coil 8 to be tested; a coil limiting component 7, disposed above the coil mounting platform 2, for fixing the combined coil 8 to be tested; and a height adjustment component 6, disposed between the coil mounting platform 2 and the coil limiting component 7, for adjusting the height of the coil limiting component 7.

[0027] In this embodiment, addressing the issues of low positioning accuracy, low operational efficiency, and insufficient stability in existing coil magnetic field measurement systems, the moving platform 1 of this fixture is placed horizontally, with the support base 11 fixed at the four corners and center of the bottom to ensure stability. A three-axis adjustment mechanism 3 is mounted on the upper surface of the moving platform 1, and the Hall probe 5 is fixed to the end of the three-axis adjustment mechanism 3 via an adjustment component 4. A coil mounting platform 2 is located on one side of the moving platform 1, with a height adjustment component 6 fixed on it. A coil limiting component 7 is mounted on the top of the height adjustment component 6, and the combined coil 8 to be tested is placed in the coil limiting component 7. During testing, the height of the coil limiting component 7 is adjusted via the height adjustment component 6 to position the combined coil 8 in a suitable measurement position. The coil limiting component 7 secures the coil, preventing displacement. The three-axis adjustment mechanism 3 drives the Hall probe 5 to move in three-dimensional space, accurately reaching the designated measurement point, thereby completing the magnetic field measurement and data acquisition. The overall stability of the equipment is good, with no vibration interference. All components work collaboratively, resulting in a smooth measurement process that meets the requirements of precision measurement and provides better performance.

[0028] Optional, please refer to Figure 1 The three-axis adjustment mechanism 3 includes an X-axis slide rail 31 fixedly installed on the upper surface of the mobile platform 1, and an X-axis slide plate 32 slidably installed on the outer side of the X-axis slide rail 31. A Y-axis slide rail 33 is fixedly installed on the upper surface of the X-axis slide plate 32, and a Y-axis slide plate 34 is slidably installed on the outer side of the Y-axis slide rail 33. A Z-axis slide rail 35 is fixedly installed on one outer wall of the Y-axis slide plate 34, and a Z-axis slide plate 36 is slidably installed on the outer side of the Z-axis slide rail 35. An adjustment component 4 is provided on the outer wall of the Z-axis slide plate 36, and a Hall probe 5 is provided at the end of the adjustment component 4.

[0029] In this embodiment, the X-axis slide rail 31 is fixed to the upper surface of the moving platform 1, and the X-axis slide plate 32 is slidably mounted on the outside of the X-axis slide rail 31, moving via a ball screw driven by a servo motor; the Y-axis slide rail 33 is fixed to the upper surface of the X-axis slide plate 32, and the Y-axis slide plate 34 is slidably mounted on the outside of the Y-axis slide rail 33, also moving via a ball screw driven by a servo motor; the Z-axis slide rail 35 is vertically fixed to one side of the Y-axis slide plate 34, and the Z-axis slide plate 36 is slidably mounted on the outside of the Z-axis slide rail 35, also moving via a ball screw driven by a servo motor; the control component 4 is fixed to the outer wall of the Z-axis slide plate 36, and the Hall probe 5 is mounted at the end of the control component 4. By sending pulse signals, the X, Y, and Z-axis servo motors are controlled to move the corresponding slide plates along the slide rails, achieving precise positioning of the Hall probe 5 in three-dimensional space; according to the coordinates of the measuring point, the X and Y axes are adjusted sequentially to determine the horizontal position, and the Z-axis is adjusted to adjust the vertical height, so that the probe is aligned with the measuring point.

[0030] Optional, please refer to Figure 1 The control component 4 includes a mounting base 41 fixedly installed on one side of the Z-axis slide plate 36. A telescopic rod 42 is rotatably connected to the outer wall of the mounting base 41 near the coil limiting component 7. The Hall probe 5 is fixedly installed at the end of the telescopic rod 42.

[0031] In this embodiment, the mounting base 41 is fixed to one side of the Z-axis slide plate 36 by bolts, and the telescopic rod 42 is rotatably connected to the mounting base 41 through a rotary joint. The Hall probe 5 is fixed to the end of the telescopic rod 42 by threads. The telescopic rod 42 can be extended and retracted to adjust its length, and the rotary joint supports 360° rotation. According to the measurement point position and angle requirements, the telescopic rod 42 can be extended and retracted to adjust the distance between the probe and the coil. Rotating the telescopic rod 42 can change the probe orientation to ensure that the probe sensing surface is perpendicular to the magnetic field direction and obtain accurate measurement data.

[0032] Optional, please refer to Figure 1 and Figure 2 The height adjustment component 6 includes a screw lift 61 fixedly installed on the upper surface of the coil mounting platform 2. A lifting platform 62 is fixedly installed at the top of the screw lift 61, and a shim block 63 is fixedly installed on the upper surface of the lifting platform 62. The coil limiting component 7 is fixedly installed above the shim block 63.

[0033] In this embodiment, the screw jack 61 is fixed to the upper surface of the coil mounting platform 2, the lifting platform 62 is fixedly connected to the top of the screw jack 61, the shim block 63 is fixed above the lifting platform 62 by bolts, and the coil limiting component 7 is placed on the upper surface of the shim block 63 and fixed. By rotating the adjusting plate of the screw jack 61, the lifting platform 62 can be raised or lowered, thereby adjusting the relative height between the coil limiting component 7 and the Hall probe 5 to adapt to different measurement distance requirements and ensure that the probe is in the optimal measurement position.

[0034] Optional, please refer to Figure 1 and Figure 2 The coil limiting assembly 7 includes a test fixture base 71 disposed on the upper surface of the shim block 63. A clamping block 72 is fixedly installed around the test fixture base 71, and the bottom of the clamping block 72 is fixedly connected to the surface of the shim block 63 by bolts. A coil fixing fixture 73 is fixedly installed above the test fixture base 71, and the combined coil 8 to be tested is disposed in the coil fixing fixture 73.

[0035] In this embodiment, the test fixture base 71 is placed on the upper surface of the shim block 63, and the surrounding clamping blocks 72 are fixed to the shim block 63 by bolts to clamp the test fixture base 71; the coil fixing fixture 73 is fixed above the test fixture base 71 by bolts, and the combined coil 8 to be tested is placed in the coil fixing fixture 73; after the test fixture base 71 is positioned, it is fixed by the clamping blocks 72 to prevent displacement during the measurement process; the coil fixing fixture 73 provides an installation reference for the combined coil to ensure the concentricity and positional accuracy of the coil.

[0036] Optional, please refer to Figure 1 and Figure 2 The combined coil to be tested 8 includes multiple concentric coils of different sizes. The outer wall of the coil fixing fixture 73 has multiple concentric annular grooves that match the coils, and the coils are located in the annular grooves. The outer wall of the coil fixing fixture 73 is also fixedly mounted with a coil pressure plate 75 by bolts, and the coils are located between the coil pressure plate 75 and the coil fixing fixture 73.

[0037] In this embodiment, the annular grooves on the coil fixing fixture 73 are concentrically distributed, and their dimensions are adapted to each coil of the combined coil 8 to be tested. After the coil is placed in the groove, the coil pressure plate 75 is fixed to the coil fixing fixture 73 by bolts to press the coil. Coils of different sizes are placed into their corresponding annular grooves to ensure that the coils are arranged concentrically. The bolts of the coil pressure plate 75 are tightened to make the coil fit tightly against the bottom of the groove, preventing displacement or shaking during the measurement process. The gap between the annular groove and the coil is only 0.1mm, the coil is accurately positioned, and there is no radial displacement. The coil pressure plate 75 is evenly stressed, the coil is not deformed, and the magnetic field distribution is not affected. It is compatible with four different sizes of coils without the need to change the fixture, and has strong versatility.

[0038] Optional, please refer to Figure 1 and Figure 2 An installation opening is provided at the center of the outer wall of the coil fixing fixture 73, and a center alignment fixture 76 is fitted into the installation opening. A center positioning hole is provided at the center of the outer wall of the center alignment fixture 76.

[0039] In this embodiment, the center alignment fixture 76 is a cylindrical structure with an outer diameter that matches the mounting opening of the coil fixing fixture 73. The diameter of the center positioning hole is 2mm and it is located on the axis of the center alignment fixture 76. Before the actual measurement, the Hall probe 5 is moved to the center positioning hole of the center alignment fixture 76 to calibrate the measurement origin. After calibration, the magnetic field on the upper plane of the coil is measured according to the test path. When measuring the axial magnetic field path of the coil, the center alignment fixture 76 is removed so that the Hall probe 5 passes through the coil fixing fixture 73. After the test, the program automatically saves the coordinates of all measurement points and the magnetic field data.

[0040] Optional, please refer to Figure 1 and Figure 2 The outer wall of the coil fixing fixture 73 is also provided with a pick-and-place groove 74 that intersects with the annular groove, and the groove depth of the pick-and-place groove 74 is greater than the groove depth of the annular groove.

[0041] In this embodiment, the pick-and-place slot 74 is formed on the outer wall of the coil fixing fixture 73 and is connected to each annular groove. The slot is 20mm wide and 5mm deeper than the annular groove, making it easy for fingers or tools to insert. When installing the coil, the coil is placed into the corresponding annular groove through the pick-and-place slot 74. When disassembling, the coil can be easily removed by inserting a tool or finger through the pick-and-place slot 74, avoiding damage to the coil or fixture. The design of the pick-and-place slot 74 reduces the coil loading and unloading time by 50%, making the operation convenient, without jamming, and improving the performance.

[0042] Another embodiment of the present invention provides a combined coil magnetic field measurement system, comprising: a combined coil magnetic field testing fixture as described above; and a host computer control module, wherein the host computer control module is used to control the testing fixture to perform measurement actions and to collect and store measurement data.

[0043] In this embodiment, the combined coil magnetic field measurement system consists of the aforementioned test fixture and a host computer control module. The host computer is connected to the servo motor and Hall probe 5 of the test fixture via an RS-232 communication interface. The host computer control module sends control commands to drive the three-axis adjustment mechanism 3 to move the Hall probe 5 to the designated measurement point. The Hall probe 5 measures the magnetic field data and transmits it to the host computer in real time. The host computer collects, stores, and analyzes the data to complete the measurement process.

[0044] Optionally, the host computer control module has built-in measurement software programmed with LabVIEW, which supports measurement point path planning, real-time display of position coordinates and magnetic field data, automatic storage and export of data, and generation of magnetic field distribution curves and three-dimensional cloud maps.

[0045] In this embodiment, the host computer control module has built-in LabVIEW programming software, which supports custom measurement point paths (such as grid scanning and ring scanning), and displays the probe position coordinates, magnetic field component values ​​(X, Y, Z axes), magnitude, and coil current in real time. The data is automatically stored as a txt file and can be exported to Excel or MATLAB for subsequent analysis. The software supports generating two-dimensional curves and three-dimensional cloud maps of the magnetic field distribution, which intuitively display the magnetic field characteristics. The Hall probe 5 is a three-dimensional Hall probe 5, which can simultaneously measure magnetic field information in three orthogonal directions. Before measurement, the measurement point path and parameters are planned through the software. During the measurement, data changes are monitored in real time, and an alarm is issued when there is an anomaly. After the measurement is completed, a data report and visualization charts are automatically generated to facilitate the analysis of the magnetic field distribution law of the combined coil. Data visualization makes the magnetic field distribution intuitive and easy to understand, and the three-dimensional magnetic field information meets the requirements of precision testing. The automatic storage and export function reduces data processing time and improves analysis efficiency by 40%. The software is easy to operate, supports custom settings, and is adaptable to different measurement scenarios.

[0046] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A combined coil magnetic field testing fixture, characterized in that, The system includes a mobile platform (1), a coil mounting platform (2), a Hall probe (5), and a combined coil to be tested (8). The bottom of the mobile platform (1) is fixedly mounted with a support base (11). The system also includes: The three-axis adjustment mechanism (3) is set on the upper surface of the moving platform (1) and is used to drive the Hall probe (5) to move in three-dimensional space to the designated measuring point of the combined coil (8) to be tested; The coil limiting component (7) is located above the coil mounting platform (2) and is used to fix the combined coil to be tested (8). A height adjustment component (6) is disposed between the coil mounting platform (2) and the coil limiting component (7) for adjusting the height of the coil limiting component (7).

2. The combined coil magnetic field testing fixture according to claim 1, characterized in that, The three-axis adjustment mechanism (3) includes an X-axis slide rail (31) fixedly installed on the upper surface of the mobile platform (1), and an X-axis slide plate (32) slidably installed on the outer side of the X-axis slide rail (31). A Y-axis slide rail (33) is fixedly installed on the upper surface of the X-axis slide plate (32), and a Y-axis slide plate (34) slidably installed on the outer side of the Y-axis slide rail (33). A Z-axis slide rail (35) is fixedly installed on one side of the outer wall of the Y-axis slide plate (34), and a Z-axis slide plate (36) slidably installed on the outer side of the Z-axis slide rail (35). An adjustment component (4) is provided on the outer wall of the Z-axis slide plate (36), and a Hall probe (5) is provided at the end of the adjustment component (4).

3. The combined coil magnetic field testing fixture according to claim 2, characterized in that, The control component (4) includes a mounting base (41) fixedly installed on one side of the Z-axis slide plate (36). The mounting base (41) is rotatably connected to a telescopic rod (42) on the outer wall of the side near the coil limiting component (7). The Hall probe (5) is fixedly installed at the end of the telescopic rod (42).

4. The combined coil magnetic field testing fixture according to claim 3, characterized in that, The height adjustment component (6) includes a screw jack (61) fixedly installed on the upper surface of the coil mounting platform (2). A lifting platform (62) is fixedly installed at the top of the screw jack (61), and a shim block (63) is fixedly installed on the upper surface of the lifting platform (62). The coil limiting component (7) is fixedly installed above the shim block (63).

5. The combined coil magnetic field testing fixture according to claim 4, characterized in that, The coil limiting assembly (7) includes a test fixture base (71) disposed on the upper surface of the shim block (63). A clamping block (72) is fixedly installed around the test fixture base (71), and the bottom of the clamping block (72) is fixedly connected to the surface of the shim block (63) by bolts. A coil fixing fixture (73) is fixedly installed above the test fixture base (71), and the combined coil (8) to be tested is disposed in the coil fixing fixture (73).

6. The combined coil magnetic field testing fixture according to claim 5, characterized in that, The combined coil to be tested (8) includes multiple concentric coils of different sizes. The outer wall of the coil fixing fixture (73) has multiple concentric annular grooves that match the coils, and the coils are located in the annular grooves. The outer wall of the coil fixing fixture (73) is also fixedly mounted with a coil pressure plate (75) by bolts, and the coils are located between the coil pressure plate (75) and the coil fixing fixture (73).

7. The combined coil magnetic field testing fixture according to claim 5, characterized in that, An installation opening is provided at the center of the outer wall of the coil fixing fixture (73), and a center alignment fixture (76) is fitted into the installation opening. A center positioning hole is provided at the center of the outer wall of the center alignment fixture (76).

8. The combined coil magnetic field testing fixture according to claim 5, characterized in that, The outer wall of the coil fixing fixture (73) is also provided with a pick-and-place groove (74) that intersects with the annular groove, and the groove depth of the pick-and-place groove (74) is greater than the groove depth of the annular groove.

9. A combined coil magnetic field measurement system, characterized in that, include: The combined coil magnetic field testing fixture as described in any one of claims 1-8; The host computer control module is used to control the test fixture to perform measurement actions and to collect and store measurement data.

10. A combined coil magnetic field measurement system according to claim 9, characterized in that, The host computer control module has built-in measurement software programmed with LabVIEW, which supports measurement point path planning, real-time display of position coordinates and magnetic field data, automatic storage and export of data, and generation of magnetic field distribution curves and three-dimensional cloud maps.

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