Multifunctional modular magnetic field generating experimental device

Abstract

This invention discloses a multifunctional modular magnetic field generating experimental device, including a base, a coil module, and a measurement module. The base is rectangular, composed of two long strips and two short strips connected together. Scale strips are provided along the length of the top surface of the two long strips, and a row of horizontal holes is formed along the length of each long strip, with the horizontal holes on the two long strips corresponding to each other. The coil module includes a support and a wire feeding reel. The support includes a horizontal rod and two vertical rods. The two ends of the wire feeding reel are respectively mounted on the two vertical rods, and the two ends of the horizontal rod are mounted on the horizontal holes of the two long strips. The measurement module includes a horizontal plate, two legs mounted on the bottom of the horizontal plate, and a grid line on the top surface of the horizontal plate. The width of the horizontal plate is smaller than the diameter of the holes in the wire feeding reel. The upper surface of the horizontal plate coincides with the horizontal plane passing through the axis of the wire feeding reel. The bottoms of the two legs are mounted on the two short strips, and the grid lines consist of identical squares. This experimental device can study the magnetic field distribution generated by complex coils.

Description

Technical Field

[0001] This invention relates to a multifunctional modular magnetic field generating experimental device. Background Technology

[0002] Coils are essential components in physics for generating magnetic fields. A single current-carrying coil is the basic component for magnetic field generation, while multiple coils can produce various magnetic fields. Different coil structures produce magnetic fields with different characteristics. The magnetic field produced by a single coil exhibits a "stronger in the middle and weaker at the edges" characteristic, while the magnetic field produced by a Helmholtz coil has a uniform magnetic field region in the center. The more complex the coil structure, the more complex the distribution of the magnetic field it produces. This is the basic understanding of coil magnetic fields in current teaching, research, and scientific research.

[0003] Currently, in university teaching, when introducing the magnetic field generated by a coil, the influence of varying pitch during coil winding is usually ignored. The coil as a whole is assumed to be tightly wound under ideal conditions. Based on the assumption of no magnetic leakage, the external magnetic field of the coil is considered zero. Then, Biot-Savart's law is used to verify the distribution of the magnetic field inside the coil and to calculate the magnitude of the magnetic field. For solving the case of multiple coils, the calculation method under ideal conditions is usually adopted, that is, calculating the superposition of the magnetic field distribution of each coil to obtain the distribution and magnitude of the magnetic field of the multiple coils. In terms of theoretical derivation, some scholars have verified the magnetic field generated by various types of coils, and the magnitude of the magnetic field can be obtained by substituting the relevant parameters of the coil. In terms of experimental verification, some scholars have used the derived formulas for visualization studies and discussed in detail the influence of factors such as the number of coil turns, coil arrangement, and current on the magnetic field distribution of the coil. However, there are few experimental designs and finished products for verifying the distribution and magnitude of the magnetic field inside a coil, and most of them are explorations and attempts at the principle level; there are even fewer experimental devices for studying the magnetic field distribution generated by complex coils, and there is still a lack of specific, detailed, and visualized experimental devices. Meanwhile, most coil magnetic field generating devices on the market are fixed, cannot be moved or disassembled, and cannot adjust experimental parameters, thus failing to achieve visualization. Summary of the Invention

[0004] To address the aforementioned deficiencies and shortcomings in coil magnetic field generating devices, this invention provides a multifunctional modular magnetic field generating experimental device.

[0005] The multifunctional modular magnetic field generating experimental device of the present invention includes a base, a coil module and a measurement module; The base is rectangular and consists of two long strips and two short strips connected together. Scale strips are set on the top surface of the two long strips along the length direction. A row of equally spaced horizontal holes is opened on both long strips along the length direction, and the horizontal holes on the two long strips correspond to each other. At least one coil module is provided. The coil module includes a support and a pay-off reel for tightly winding the coil. The support includes a horizontal rod and two vertical rods mounted on the horizontal rod. The pay-off reel is detachably mounted on the two vertical rods at both ends. The horizontal rod is detachably mounted on two elongated horizontal holes in the base at both ends. The measuring module includes a rectangular horizontal plate, two legs detachably mounted on the bottom of the horizontal plate, and grid lines set on the top surface of the horizontal plate. The width of the horizontal plate is smaller than the diameter of the feed reel. The upper surface of the horizontal plate coincides with the horizontal plane passing through the axis on the feed reel. The bottom of the two legs is respectively mounted on two short strips of the base. The grid lines are formed by a number of parallel lines to the long strips and a number of perpendicular lines to the long strips. All grids in the grid lines are identical squares.

[0006] Furthermore, recessed screw holes are made on both ends of the horizontal bar. Screws are passed through the horizontal holes on the base strip and screwed into the screw holes on the horizontal bar to detachably connect the base strip and the horizontal bar. This allows the horizontal bar to be detachably mounted on the base strip, making installation, disassembly, and use convenient, and ensuring structural stability.

[0007] Furthermore, the lower end face of the support leg is provided with a stud, and the top surface has a downward-facing recessed screw hole. A downward-facing recessed screw hole is also provided on the top surface of the short strip of the base. The stud of the support leg and the screw hole on the short strip are threaded together. Through holes are respectively provided at both ends of the horizontal plate. Screws are passed through the through holes of the horizontal plate and screwed into the screw holes at the top of the support leg to detachably connect the horizontal plate and the support leg. In this way, the support leg can be detachably installed on the horizontal plate, making installation, disassembly, and use convenient, and ensuring structural stability.

[0008] Furthermore, mounting plates are respectively installed on both sides of the pay-off reel and at both ends. The mounting plates have a first horizontal through-hole, and the upright has a second horizontal through-hole. Screws are passed through the first and second mounting holes and fitted with nuts to detachably connect the pay-off reel and the upright. This facilitates the installation and removal of the pay-off reel and the upright.

[0009] Furthermore, a wiring socket is provided on the upright for the protruding end of the coil to be connected to the reel. This facilitates the limiting of the protruding end of the coil, stably maintains the winding state of the coil, and facilitates energization operation.

[0010] Furthermore, the midpoint of the scale bar displays a reading of 0, corresponding to the midpoint of the long bar, while the scale reading gradually increases towards both sides. This makes the reading intuitive and reliable, and facilitates observation, recording, and calculation.

[0011] Beneficial Effects: This experimental setup, by separately constructing a measurement module and a coil module, allows for arbitrary modification of the position, size, and number of tightly wound coils. This provides feasibility for subsequent experiments investigating the magnetic field distribution of single coils, Helmholtz coils, multi-coil coils, complex multi-coil coils, and Maxwell coils, and offers possibilities for exploring the influence of factors such as the number of coil turns, coil size, and coil distance on magnetic field distribution. The measurement platform can be used with various magnetic induction intensity measuring instruments, such as a magnetic field gaussmeter and a Hall effect experimental apparatus. The experimental setup is simple, convenient, easy to assemble and disassemble, safe, reliable, multifunctional, visual, and has adjustable experimental parameters. It helps operators to deeply understand the distribution characteristics of coil magnetic fields and the distribution characteristics and principles of magnetic fields composed of various coils. It has a wide range of applications and can be used in university physics experimental teaching and electromagnetic research. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of the experimental apparatus of the present invention; In the diagram, 1 is a long strip; 11 is a scale strip; 12 is a horizontal hole; 2 is a short strip; 3 is a horizontal bar; 4 is a vertical pole; 41 is a wiring socket; 5 is a wire reel; 51 is a mounting plate; 6 is a horizontal plate; 7 is a support leg; and 8 is a grid line. Detailed Implementation

[0013] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0014] like Figure 1 As shown, a multifunctional modular magnetic field generating experimental device includes a base, a coil module, and a measurement module.

[0015] The base is rectangular, consisting of two long strips 1 and two short strips 2 connected together. A scale bar 11 (with graduations perpendicular to the strip 1) is provided on the top surface of the two long strips 1 along their length. The midpoint of the scale bar 11 has a reading of 0, corresponding to the midpoint of the long strip 1, and the reading gradually increases towards both sides. A row of equally spaced horizontal holes 12, 0.5 cm apart, is provided on each of the two long strips 1 along their length, corresponding to each other. Recessed screw holes are provided at the center of each end face of the two short strips 2. Screws are threaded through the horizontal holes 12 of the long strips 1 and into the screw holes at the ends of the short strips 2 for secure connection.

[0016] At least one coil module is provided. The coil module includes a support and a pay-off reel 5 for tightly winding the coil. The support includes a horizontal rod 3 and two vertical rods 4 that are vertically mounted and fixed on the horizontal rod 3. The two ends of the pay-off reel 5 are detachably mounted on the two vertical rods 4 respectively.

[0017] The horizontal rod 3 is detachably mounted at both ends on the horizontal holes 12 of the two long strips 1 of the base. Specifically, recessed screw holes are made at the center of each end face of the horizontal rod 3. The long strip 1 and the horizontal rod 3 are detachably connected by screws passing through the horizontal holes 12 on the long strip 1 of the base and screwing into the screw holes on the horizontal rod 3. A recessed groove is made on the top surface of the horizontal rod 3 for the lower end of the vertical rod 4 to be inserted into. A countersunk hole is made through the groove from the bottom surface of the horizontal rod 3. A recessed screw hole is made on the lower end face of the vertical rod 4. The lower end of the vertical rod 4 is inserted into the groove of the horizontal rod 3. Then, screws are made through the countersunk hole from the bottom surface of the horizontal rod 3 and screwed into the screw hole at the lower end of the vertical rod 4 to fix the horizontal rod 3 and the vertical rod 4 together. Mounting plates 51 extending outwards are provided on both sides of the pay-off reel 5. Each mounting plate 51 has two horizontally penetrating first mounting holes, and a corresponding horizontally penetrating second mounting hole is provided on the upright 4. Screws are used to pass through the first and second mounting holes and, in conjunction with nuts, to detachably connect the pay-off reel 5 and the upright 4. Mounting plates 51 also have four horizontally penetrating third mounting holes (two on top and two on the bottom), and a corresponding horizontally penetrating fourth mounting hole is provided on the surface of the pay-off reel 5. Screws and nuts are used to fix the mounting plates 51 to the pay-off reel 5. Additionally, a wiring socket 41 is provided on the upright 4 for the protruding end of the coil mounted on the pay-off reel 5 to be connected. The radius of the coil tightly wound on the pay-off reel 5 of the coil module can be, for example, 50mm or 75mm, with, for example, 50 turns in both, and a wire diameter of, for example, 0.7mm in both. When there are two coil modules, there are two pay-off reels 5, and the radii of the tightly wound coils can be the same or different (for example, one coil radius is 50mm, and the other coil radius is 75mm).

[0018] The measuring module includes a rectangular horizontal plate 6, two legs 7 detachably mounted on the bottom of the horizontal plate 6, and a grid line 8 on the top surface of the horizontal plate 6. The width of the horizontal plate 6 is smaller than the diameter of the feed reel 5. The upper surface of the horizontal plate 6 coincides with the horizontal plane passing through the axis on the feed reel 5. The bottoms of the two legs 7 are respectively mounted on two short strips 2 of the base. The grid line 8 is formed by a series of lines parallel to the long strip 1 and a series of lines perpendicular to the long strip 1, and all the grids in the grid line 8 are identical squares. The horizontal plate 6 is parallel to the long strip 1 of the base.

[0019] Specifically, the lower end face of the support leg 7 is provided with a stud, and the center of the top surface has a downward-facing screw hole. The center of the top surface of the base short strip 2 also has a downward-facing screw hole. The stud of the support leg 7 and the screw hole on the top surface of the short strip 2 are threaded together. Through holes are opened at both ends of the horizontal plate 6, and the line connecting the two through holes is the center line of the horizontal plate. Screws are used to pass through the through holes of the horizontal plate 6 and screw into the screw holes at the top of the support leg 7 to detachably connect the horizontal plate 6 and the support leg 7.

[0020] In practical use, after assembling the above experimental setup, various experiments on the magnetic induction intensity of coil magnetic fields can be conducted. It requires the following components: a portable constant current adjustable power supply, several wires, several plugs, and a magnetic induction intensity measuring instrument (a gaussmeter, Hall effect experimental apparatus, etc.). The current used can be in multiple ranges, with a maximum of 5A. The specific experimental steps are as follows.

[0021] Application Example 1 Investigate the magnitude and distribution characteristics of the magnetic field generated by a single coil. Connect the pre-prepared plugs and wires. Place the two short strips 2 of the base at the "17.5" mark on both sides of the two long strips 1, and tighten the screws to ensure that the center of the horizontal plate 6 of the subsequently added measuring platform is aligned with the center of the long strips 1 (i.e., the center of the horizontal plate 6 of the measuring platform is aligned with the 0 mark). Screw the support legs 7 into the screw holes on the top surface of the short strips 2. Densely wind the coil on the pay-off reel 5, install the pay-off reel 5 with the coil on the upright rod 4 of the bracket, and position the upright rod 4 between the two reels. Tighten the screws to secure the pay-off reel 5 and the upright rod 4. Then align the two ends of the horizontal rod 3 of the bracket with the "0" mark on the center of the two long strips 1, and then tighten it onto the two long strips 1 with screws. Insert the horizontal plate 6 into the hole of the pay-off reel 5 and fix it to the support legs 7 with screws. Connect the constant current power supply to the wiring socket 41 on the upright rod 4 and connect it to the extended end of the coil to achieve a normal circuit state. Turn on the constant current power supply and adjust it to the required current range to preheat the coil appropriately. Using a magnetic induction intensity measuring instrument, place the corresponding probe on the horizontal plate 6. Since the horizontal and vertical lines of the grid 8 on the horizontal plate 6 are spaced at the same intervals, measurements can be taken at equal intervals. Record the data in a data table after measurement. Calculate the corresponding theoretical values ​​using the theoretically derived formulas and write them into the data table for comparison with experimental values. Use computer software to fit the axial magnetic field distribution characteristics of the single coil and obtain the three-dimensional distribution characteristics of the internal magnetic field of the single coil by analogy.

[0022] Application Example 2 Investigate the magnitude and distribution characteristics of the magnetic field generated by the Helmholtz coil. Connect the pre-prepared plugs and wires. Place the two short strips 2 on both sides of the two long strips 1 at the "17.5" mark, and tighten the screws to ensure that the center of the horizontal plate 6 of the subsequently added measuring platform is aligned with the center of the long strips 1 (i.e., the center of the horizontal plate 6 of the measuring platform is aligned with the 0 mark). Screw the support legs 7 into the screw holes on the top surface of the short strips 2. Densely wind the coil on the pay-off reels 5, select two pay-off reels 5 with coils, and install them on the uprights 4 of the support. Secure the two ends of the horizontal rod 3 of the support to the two long strips 1 with screws, ensuring that the distance between each pay-off reel 5 and the 0 mark is equal to the radius of its respective coil. Insert the horizontal plate 6 of the measuring platform into the holes of the two pay-off reels 5 and fix it to the support legs 7 with screws. Connect the constant current power supply to the wiring socket 41 on the uprights 4 and connect it to the extended end of the coil to achieve a normal circuit state. Turn on the constant current power supply, adjust it to the required current level, and preheat the coil appropriately. Using a magnetic induction intensity measuring instrument, the corresponding probe is placed on a horizontal plate 6. Since the horizontal and vertical grid lines 8 on the horizontal plate 6 are spaced at the same intervals, measurements can be taken at equal intervals. After measurement, the data is recorded in a data table. The corresponding theoretical values ​​are calculated using theoretically derived formulas and entered into the data table for comparison with experimental values. Computer software is used to fit the axial Helmholtz magnetic field distribution characteristics, and by analogy, the three-dimensional distribution characteristics of the magnetic field inside a Helmholtz coil are obtained.

[0023] Unless otherwise specified, all technologies mentioned above refer to existing technologies.

[0024] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification.

Claims

1. A multifunctional modular magnetic field generating experimental device, characterized in that, Includes a base, coil module, and measurement module; The base is rectangular and consists of two long strips and two short strips connected together. Scale strips are set on the top surface of the two long strips along the length direction. A row of equally spaced horizontal holes is opened on both long strips along the length direction, and the horizontal holes on the two long strips correspond to each other. At least one coil module is provided. The coil module includes a support and a pay-off reel for tightly winding the coil. The support includes a horizontal rod and two vertical rods mounted on the horizontal rod. The pay-off reel is detachably mounted on the two vertical rods at both ends. The horizontal rod is detachably mounted on two elongated horizontal holes in the base at both ends. The measuring module includes a rectangular horizontal plate, two legs detachably mounted on the bottom of the horizontal plate, and grid lines set on the top surface of the horizontal plate. The width of the horizontal plate is smaller than the diameter of the feed reel. The upper surface of the horizontal plate coincides with the horizontal plane passing through the axis on the feed reel. The bottom of the two legs is respectively mounted on two short strips of the base. The grid lines are formed by a number of parallel lines to the long strips and a number of perpendicular lines to the long strips. All grids in the grid lines are identical squares.

2. The multifunctional modular magnetic field generating experimental device according to claim 1, characterized in that, Inwardly recessed screw holes are made on both ends of the horizontal bar. The long bar and the horizontal bar are detachably connected by screws passing through the horizontal holes on the base strip and screwing into the screw holes on the horizontal bar.

3. The multifunctional modular magnetic field generating experimental device according to claim 1, characterized in that, The lower end face of the support leg is provided with a stud, and the top face has a downward-facing screw hole. The top face of the short strip of the base also has a downward-facing screw hole. The stud of the support leg and the screw hole on the short strip are threaded together. Through holes are opened at both ends of the horizontal plate. Screws are used to pass through the through holes of the horizontal plate and screw into the screw holes at the top of the support leg to detachably connect the horizontal plate and the support leg.

4. The multifunctional modular magnetic field generating experimental device according to claim 1, characterized in that, Mounting plates are installed on both sides of the pay-off reel and at both ends. The mounting plates have a first horizontal through-hole, and the upright has a second horizontal through-hole. Screws are used to pass through the first and second mounting holes and are used with nuts to detachably connect the pay-off reel and the upright.

5. The multifunctional modular magnetic field generating experimental device according to claim 1, characterized in that, A wiring socket is provided on the pole for the extended end of the coil installed on the wire reel to be connected.

6. The multifunctional modular magnetic field generating experimental device according to claim 1, characterized in that, The scale reading at the midpoint of the scale bar is 0 and corresponds to the midpoint of the long bar. The scale reading gradually increases towards both sides.

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