A quantitative experimental device for Ampere force

Abstract

Disclosed is an Ampere force quantitative experimental device, including a coil, an electromagnet, a turntable, a bracket, a micro-force sensor, a current sensor, an angle sensor and a power supply. The bracket includes a base, a rotating support seat arranged above the base and a cantilever structure for arranging the micro-force sensor. The turntable is installed on the rotating support seat. Two electromagnets are arranged on the turntable and are respectively connected to the power supply. The angle sensor is arranged at the bottom of the bracket for detecting the rotation angle of the turntable. One end of the coil is suspended at the bottom of the micro-force sensor and placed between the two electromagnets. The power supply, the current sensor and the coil are connected in series to form a first loop, and the power supply and the electromagnet form a second loop. The experimental device of the invention has high measurement accuracy, stable data and high accuracy, and can comprehensively, quantitatively, intuitively and quickly measure the size of the Ampere force F and five related physical quantities (B, I l , L, Sinθ, θ) relationship.

Description

Technical Field

[0001] The invention relates to a physical experimental device, and in particular to an Ampere force quantitative experimental device. Background Art

[0002] Exploring the relationship between Ampere force and various related physical quantities is an important experiment in high school physics teaching. This is also clearly required in the new curriculum standards of the Ministry of Education, and the national college entrance examination instructions also require the application of the Ampere force formula. This experiment is a difficult experiment. Exploring the Ampere force formula F = BI l LSinθ content: When B, L, θ remain unchanged, F∝I l ; when I l , L, θ are constant, F∝B; when B, I l , θ is constant, F∝L; when B, I l , when L is constant, the relationship between F and θ, the relationship between F and Sinθ. F——Ampere force, B——magnetic field strength, I l ——The current intensity passing through the wire, L: the effective length of cutting the magnetic flux lines, θ is the angle between the magnetic field direction and the current direction, and sinθ is the sine of the angle θ.

[0003] Among the existing physics teaching equipment, although many people want to study an experimental instrument that can measure the relationship between the Ampere force F and various related physical quantities (B, I1, L, Sinθ, θ) in a relatively comprehensive, quantitative, intuitive and fast manner, there are always problems such as incomplete measurement and exploration content, poor controllability of operation, and difficulty in promotion. In particular, there is no experimental equipment that can demonstrate the sinusoidal relationship between the Ampere force F and the angle θ between the current of the conductor and the direction of the magnetic field in a good controllable manner. Summary of the invention

[0004] In order to solve the problems in the prior art that the experimental content is incomplete, the operation controllability is poor, and the relationship between the Ampere force F and the angle θ between the current of the conductor and the direction of the magnetic field cannot be well demonstrated, the present invention proposes an Ampere force quantitative experimental device to solve the above technical problems.

[0005] According to one aspect of the present invention, an Ampere force quantitative experimental device is proposed, which includes a coil, an electromagnet, a turntable, a bracket, a micro-force sensor, a current sensor, an angle sensor and a power supply. The bracket includes a base, a rotating support seat arranged above the base and a cantilever structure for arranging the micro-force sensor. The turntable is installed on the rotating support seat. Two electromagnets are arranged on the turntable and are respectively connected to the power supply. The angle sensor is arranged at the bottom of the bracket for detecting the rotation angle of the turntable. One end of the coil is suspended at the bottom of the micro-force sensor and placed in the middle of the two electromagnets. The power supply, the current sensor and the coil are connected in series to form a first loop, and the power supply and the electromagnet form a second loop. The experimental device can complete the quantitative experimental demonstration of Ampere force and realize 360-degree magnetic field rotation through the ingenious arrangement of the rotating disk and the variable number of turns coil. At the same time, there is no need to replace the coil, which greatly improves the experimental efficiency.

[0006] Preferably, the coil is a variable turns coil, which is a tapped coil and has at least 4 turns of taps. With the setting of the variable turns coil, different turns of coils can be tested through different taps, avoiding the trouble of frequent coil replacement and improving experimental efficiency.

[0007] Further preferably, the variable turns coil includes a square coil bracket, and the tap is arranged on one side of the coil bracket suspending the micro-force sensor. With this arrangement, it is more convenient for the experimenter to complete the switching of the coil turns and avoid interference from other equipment.

[0008] Preferably, the turntable is provided with a terminal, which passes through the turntable. The arrangement of the terminal can facilitate the connection of the wire.

[0009] Preferably, the electromagnet is connected to the terminal at the upper end of the turntable by a wire, and the terminal at the lower end of the turntable is connected to the power supply. The terminal arranged at the bottom of the turntable is connected to the power supply to prevent the wire from being entangled with the electromagnet when the turntable rotates, thereby affecting the experimental operation.

[0010] Preferably, the N poles and S poles of the two electromagnets on the turntable are opposite to each other. With this arrangement, the effectiveness of the magnetic field can be ensured.

[0011] Preferably, the power supply is an adjustable low-voltage digital display power supply, including a first power supply for powering the first circuit and a second power supply for powering the second circuit. By using two power supplies to power the two circuits separately, it is convenient to adjust the parameters of the two circuits separately and realize more different experimental projects.

[0012] Preferably, the rotating support seat is a cross structure, and a reinforcement portion is provided between two adjacent arms of the cross structure. The turntable is fixed on the rotating support seat. A bearing is provided at the center of the rotating support seat, and is connected to an angle sensor provided in the middle of the base through a connecting rod. The cantilever structure is fixed on the base, and a clamp for clamping the micro-force sensor is slidably provided on the cantilever structure.

[0013] Further preferably, the angle sensor is a photoelectric angle sensor, and the connecting rod connects the photoelectric angle sensor and the bearing. By using the coaxial arrangement of the photoelectric angle sensor and the bearing, the angle information of the turntable can be flexibly rotated and rotated 360 degrees, and the accuracy, stability and effectiveness of the experimental data can be ensured.

[0014] Preferably, a computer is also included, and the current sensor, angle sensor and micro-force sensor are connected to the computer through signal lines. With the access of the computer equipment, various parameters can be intuitively synchronized to the computer, and then converted into corresponding experimental data charts, so as to better realize the quantitative experiment of Ampere force.

[0015] The present invention provides an Ampere force quantitative experimental device, which is aimed at the following problems of the existing Ampere force quantitative experimental devices in the same field in China: (1) the structure of the instrument is complex; (2) the number of turns of the force-bearing coil is single and it is troublesome to replace it. Moreover, since the Ampere force to be measured is very small, a micro-force sensor is selected for measurement. However, the weight of the coil with a variable number of turns often exceeds the range of the micro-force sensor, which has been a problem that has troubled people for a long time; (3) the strength of the magnetic field is difficult to quantitatively control and adjust. If an electromagnet is selected to provide excitation, although the magnetic field strength is well controllable, when a rotating magnetic field is to be provided, the wires that power the electromagnet will be wound around the electromagnet, affecting the experimental operation and experimental measurement. Because of this problem, many people use permanent magnets (such as "ferroboron") to provide a magnetic field. Although permanent magnets are superimposed to change the magnetic field strength, this also belongs to qualitative or semi-quantitative experimental measurement. At present, the device that uses electromagnets to provide rotating magnetic fields in China can only deflect at a small angle and cannot rotate 360 ​​degrees. Therefore, it cannot draw a sinusoidal curve image of the relationship between the Ampere force F and the angle θ between the current of the conductor and the direction of the magnetic field. (4) Because the angle sensor is difficult to install on the rotating disk and if a magnetic angle sensor is used, its measurement accuracy will be affected by the interference of the magnetic field, the angle can only be measured by engraving the angle line on the disk loaded with the magnet. When measuring, the angle can only be recorded manually by visual reading. Its operation and data processing are cumbersome, so there are problems such as the angle measurement device is not accurate enough and has poor controllability, and it cannot automatically obtain data and cannot rotate 360 ​​degrees; (5) Since the measured Ampere force is very small, the micro-force sensor used for accurate measurement has high measurement accuracy and how to achieve the stability of its measurement data is also a very important issue, which is also a difficult problem; (6) Problems such as the incompleteness of the experimental content.

[0016] In view of the above-mentioned problems, the present invention proposes and implements technical solutions to the problems: (1) A rotatable turntable bracket is provided to solve the problems of complex device structure and the inability to change the direction of the magnetic field 360 degrees, thereby solving the problem of the difficulty in obtaining a data relationship diagram of the Ampere force and the magnetic field angle θ; (2) A coil with a variable number of turns is provided to solve the technical problem that the number of turns of the force-bearing coil is single and needs to be frequently replaced, and at the same time solves the difficulty that the total weight of the coil and the Ampere force do not exceed the measuring range of the micro-force sensor in actual use; (3) The electromagnet is placed above the rotating disk, and the wire that powers the electromagnet is designed to be routed from the top of the disk through the bottom of the disk, thereby solving the problem that when the wire is routed from the top of the disk, the wire will be entangled around the electromagnet when the disk rotates, thus affecting the operation and experimental measurement. Therefore, an electromagnet is used to provide a magnetic field and a digitally displayed current and voltage adjustable power supply, which solves the technical problem that the magnetic field strength is difficult to control and cannot be adjusted; (4) An angle sensor is installed at the bottom of the rotating disk, and its shaft rotates synchronously with the disk, which solves the difficulty of not having a suitable position to install the angle sensor above the disk; (5) The setting of the photoelectric angle sensor and the micro-force sensor solves the technical problems of the force measuring device and the angle measuring device being inaccurate and poorly controllable; (6) The presentation method of the experimental results is designed: the computer automatically processes and acquires data, automatically generates images, etc., and the computer interface presents "data + image + equation + correlation coefficient", which is intuitive and scientific; (7) Finally, through the computer data and image output, a comprehensive, quantitative, intuitive and fast measurement of the relationship between the Ampere force and related physical quantities is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated into and constitute a part of this specification. The accompanying drawings illustrate the embodiments and are used together with the description to explain the principles of the present invention. It will be easy to recognize other embodiments and many expected advantages of the embodiments because they become better understood by reference to the following detailed description. The elements of the drawings are not necessarily to scale with each other. The same reference numerals refer to corresponding similar parts.

[0018] Figure 1 is a stereogram of an Ampere force quantitative experimental device according to an embodiment of the present invention;

[0019] Figure 2 is a schematic diagram of a bracket according to a specific embodiment of the present invention;

[0020] Figure 3 is a data relationship diagram between the Ampere force and the magnetic field intensity obtained by using the Ampere force quantitative experimental device according to a specific embodiment of the present invention;

[0021] Figure 4is a data relationship diagram between the Ampere force and the conductor current obtained by using the Ampere force quantitative experimental device according to a specific embodiment of the present invention;

[0022] Figure 5 is a data relationship diagram between the Ampere force and the conductor length obtained by using the Ampere force quantitative experimental device according to a specific embodiment of the present invention;

[0023] Figure 6 is a data relationship diagram between the Ampere force and the magnetic field angle θ obtained by using an Ampere force quantitative experimental device according to a specific embodiment of the present invention;

[0024] Figure 7 It is a data relationship diagram between Ampere force and sinθ obtained by using an Ampere force quantitative experimental device according to a specific embodiment of the present invention.

[0025] Description of the accompanying drawings: 1. Bracket; 2. Rotating support seat; 3. Rotating disk; 4. Electromagnet; 5. Force coil; 6. Force measuring device; 7. Force measuring device bracket; 8. Angle sensor; 9. Power supply; 10. Computer. DETAILED DESCRIPTION

[0026] In the following detailed description, reference is made to the accompanying drawings, which form a part of the detailed description and are shown by illustrative specific embodiments in which the present invention can be put into practice. To this end, directional terms, such as "top", "bottom", "left", "right", "up", "down", etc., are used with reference to the orientation of the figures described. Because the parts of the embodiments can be positioned in several different orientations, directional terms are used for the purpose of illustration and are by no means limiting. It should be understood that other embodiments may be utilized or logical changes may be made without departing from the scope of the present invention. Therefore, the following detailed description should not be adopted in a limiting sense, and the scope of the present invention is defined by the appended claims.

[0027] Figure 1 FIG. 2 shows a stereogram of an Ampere force quantitative experimental device according to an embodiment of the present invention. Figure 1As shown in the figure, the device includes a bracket 1, a turntable 3, an electromagnet 4, a coil 5, a force measuring device 6, a force measuring device bracket 7, an angle sensor 8, a power supply 9, and a computer 10. Among them, a rotatable rotary support 2 is provided on the bracket 1, the turntable 3 is fixed to the rotary support 2, the electromagnet 4 is fixedly arranged on the upper end surface of the turntable 3, and the N poles and S poles of the two electromagnets 4 are cross-opposed to form a complete magnetic field. The force measuring device 6 is fixed to the force measuring device bracket 7, the coil 5 is suspended below the force measuring device 6 and is arranged in the magnetic field formed between the two electromagnets 4. The angle sensor 8 is arranged at the bottom of the bracket 1 and is connected to the rotary support 2 through a connecting rod to obtain the rotation angle of the turntable 3. Two groups of power supplies 9 are also provided to supply power to the electromagnet 4 and the coil 5 respectively. A current sensor is also included. The current sensor, the force measuring device 6, and the angle sensor 8 are connected to the computer 10 to convert the data into a graph. Using the turntable 3 to carry the electromagnet 4, it can rotate flexibly by 360 degrees. The angle sensor 8 automatically obtains the angle data, with good controllability. And using the computer, the F-θ sine curve relationship image can be quickly and completely fitted.

[0028] Continue to refer to Figure 2 , Figure 2 shows a schematic diagram of the bracket of a specific embodiment of the present invention. As Figure 2 shown, the bracket 1 is welded by stainless steel square tubes. The upper end surface has a "field" - shaped structure, supplemented by four feet to form the main structure of the bracket 1. Specifically, the specification of the stainless steel square tube is 3cm * 3cm, the side length of the "field" - shaped structure is 35cm * 35cm, and the height of the feet is 15cm. The structure of this bracket 1 is simple, has strong stability, and is also small in volume. It can be assembled by welding or bolt - connection. It should be recognized that the above dimensions can be selected according to the requirements of the actual experimental device for other appropriate sizes and external structures, and the technical effects of the present invention can also be achieved.

[0029] In a preferred embodiment, the turntable 3 is a wooden disc. The turntable 3 is fixed to the rotary support 2 by bolt - connection, with a specification of a diameter of 35cm and a thickness of 1cm. Using a wooden disc can reduce the weight of the device and is convenient for disassembly and assembly. At the same time, it can also meet the strength requirements and can support the electromagnet 4. Alternatively, in addition to being a wooden disc, the turntable 3 can also be set as other materials or structures, such as a disc or an elliptical disc made of acrylic material, etc., and the technical effects of the present invention can also be achieved.

[0030] In a specific embodiment, the rotating disk 3 is provided with two terminals, which penetrate the rotating disk 3 and are used to connect and power the electromagnet 4. The electromagnet 4 is connected to the terminals on the upper end face of the rotating disk 3 through a wire, and the terminals on the lower end face are connected to the power supply 9. The length of the wire connecting the terminals on the lower end face and the power supply 9 is set to meet the requirement that when the disk rotates 360 degrees, the wire can be wound between the rotating support seat 2 and the bracket 1, and will not affect the rotation, nor will it be pulled and broken, and the disk can rotate flexibly and easily as a whole. The wire length in the present invention is 80cm. This setting solves the problem that it can only deflect at a small angle for a long time and cannot achieve a 360-degree rotation.

[0031] In a specific embodiment, the structure of the rotating support seat 2 is a "cross" structure, and a reinforcement portion is provided between two adjacent sides to strengthen the support capacity of the rotating disk 3 to prevent the rotating disk 3 from tipping over due to the excessive weight of the electromagnet 4. A fixing hole corresponding to the rotating disk 3 is provided at the end of the "cross" structure to fix the rotating disk 3 on the rotating support seat 2, and a bearing is provided at the bottom center of the "cross" structure so that the rotating support seat 2 can rotate smoothly above the bracket 1. Alternatively, in addition to the "cross" structure, the structure of the rotating support seat 2 can also be other supporting structures, such as a "field" shaped structure, which can also achieve the effect of supporting rotation.

[0032] In a specific embodiment, the rotation diameter of the rotating support seat 2 and the rotation diameter of the rotating disk 3 are smaller than the side length of the upper end surface of the bracket 1, so as to avoid the rotating disk 3 and the rotating support seat 2 interfering with the cantilever structure 7 during rotation and failing to achieve 360-degree rotation.

[0033] In a specific embodiment, the coil 5 is a coil with a variable number of turns, specifically a tap-type variable number of turns coil, a square coil bracket is made of a thin acrylic plate, and the size is about 6cm×13cm. The same bracket is divided into four groups around the coil, namely 100 turns, 200 turns, 300 turns, and 400 turns. Each group leads to a terminal, with a total of five taps at the head and tail. The five wiring taps of the coil are concentrated above the coil 5 and are consistent with the suspension direction, which will not affect the electromagnet 4 and the rotating disk 3 when they rotate. The use of this tap-type variable number of turns coil can save the time of replacing the coil. If a bracket is independently wound around a group of coils, whether the independent coils are three groups or four groups, the coils must be replaced when doing experiments, which is both troublesome and wastes experimental time. The coil of the present invention is designed with five taps, so there are four groups of data during the experiment, and the plotting point fitting of the relationship between related physical quantities is more scientific. Regarding the coil production of the same bracket, domestic researchers generally do not use more than three groups of coils with different numbers of turns, because more groups will involve coil weights that exceed the force sensor's range, and the scientificity of plotting three groups of experimental data is relatively lacking.

[0034] In a specific embodiment, if the number of turns and groups of the coil is large, the weight of the entire coil will be greater, and it is also necessary to determine whether it exceeds the weighing range of the force measuring device 6. If the force measuring device 6 has a higher precision, its weighing range will be smaller, and the weight of the coil produced at this time cannot be large. As a quantitative experiment, if the measurement accuracy is higher, the requirements for data stability and accuracy are higher, and the difficulty of making the entire instrument is higher; otherwise, the difficulty is lower. Because the more groups there are, the more data points are measured, and the depicted image is relatively accurate and scientific. According to multiple tests and verifications by the applicant of the present invention, the use of 4 groups of coils can maximize the requirements of the experimental data points while maintaining the high precision requirements of the force measuring device 6.

[0035] In a preferred embodiment, the force measuring device 6 is a micro-force sensor with an accuracy of 0.001N, which can improve the accuracy of the measurement, and thus the experimental results obtained are more accurate and scientific. It should be recognized that for scenarios where the experimental accuracy requirements are not high, other precision force measuring devices can be selected, and the number of turns of the coil 5 can be increased or decreased in the same way, which can also achieve the technical effects of the present invention.

[0036] In a preferred embodiment, the power supply 9 is an adjustable low-voltage digital display current and voltage power supply. The power supply, current sensor and coil are connected in series to form a first circuit, and the power supply and the electromagnet form a second circuit. The two separately arranged adjustable low-voltage digital display power supplies can separately control the two circuits, thereby realizing different transformations of current and magnetic field strength to achieve parameters of different experimental projects.

[0037] In a preferred embodiment, the angle sensor 8 is a photoelectric angle sensor. Compared with an ordinary magnetic angle sensor, the photoelectric angle sensor is not affected by the magnetic field during the experiment, and the angle obtained is more accurate. The angle sensor 8 is installed at the bottom center of the bracket 1, and is connected to the bearing through a connecting rod coaxially, and then it will rotate synchronously with the rotating disk 3 and the rotating support seat 2, and can synchronously obtain the rotation angle of the rotating disk 3 and the rotating support seat 2, and transmit the value to the computer 10 through a signal line, and automatically obtain the rotation angle in real time, without the need to draw angle lines on the rotating disk, and without manual visual and manual recording of angle data.

[0038] In a preferred embodiment, the electromagnet 4 uses an electromagnet with a power of 300 W. Compared with a permanent magnet (such as Ni-Fe-B), the electromagnet 4 has better controllability in adjusting the magnetic field strength, and does not require a ruler or other auxiliary accessories.

[0039] Based on the above experimental device, Table 1 shows the experimental contents that can be performed by the Ampere force quantitative experimental device of one embodiment of the present invention, which is used to verify the relationship between various parameters in the calculation formula of Ampere force:

[0040] Table 1:

[0041]

[0042] Ampere force formula F = BI l LSinθ

[0043] F——Ampere force, B——magnetic field strength, I l ——The current intensity passing through the wire, L: the effective length of cutting the magnetic flux lines, θ is the angle between the magnetic field direction and the current direction, and sinθ is the sine of the angle θ.

[0044] Exploring the Ampere force formula F=BI l LSinθ content:

[0045] ① When B, L, θ remain unchanged, F∝I l ;

[0046] ②When I l , L, θ is constant, F∝B;

[0047] ③When B, I l , when θ remains unchanged, F∝L;

[0048] ④When B, I l , when L remains unchanged, the relationship between F and θ, and the relationship between F and Sinθ.

[0049] Figure 3 FIG. 4 shows a data relationship diagram of the Ampere force and the magnetic field strength obtained by using the Ampere force quantitative experimental device in a specific embodiment of the present invention, as shown in FIG. Figure 3 As shown, when I l , L, θ remain unchanged, the above experimental device can be used to intuitively explore the proportional relationship between F and B (Note: ∵B=KI B ∴Exploring F∝I B ).

[0050] Figure 4 FIG. 4 shows a data relationship diagram of the Ampere force and the conductor current obtained by using the Ampere force quantitative experimental device in a specific embodiment of the present invention, such as Figure 4 As shown in the figure, when B, L, and θ remain unchanged, the above experimental device can be used to intuitively explore the relationship between F and I l The proportional relationship.

[0051] Figure 5 FIG. 4 shows a data relationship diagram of the Ampere force and the conductor length obtained by using the Ampere force quantitative experimental device according to a specific embodiment of the present invention, as shown in FIG. Figure 5 As shown, when B, I l , when θ remains unchanged, the above experimental device can be used to intuitively explore the proportional relationship between F and L.

[0052] In particular, in the experiment of exploring the relationship between F and θ, the present invention utilizes a rotating disk to rotate 360 ​​degrees and directly fits a sinusoidal curve image of F and θ in computer software. Figure 6 FIG. 4 shows a data relationship diagram of the Ampere force and the magnetic field angle θ obtained by using the Ampere force quantitative experimental device in a specific embodiment of the present invention, as shown in FIG. Figure 6 As shown, when B, I l , when L is constant, the relationship between F and θ is explored. The experimental phenomena are as follows: ① From the sinusoidal curve graph, it can be seen intuitively that when the direction of the magnetic field is parallel to the direction of the current, F is zero, and when the direction of the magnetic field is perpendicular to the direction of the current, the F value is the largest; ② The textbook directly gives the angle θ between the Ampere force F and the direction of the magnetic field and the direction of the current, and then uses mathematical methods to deduce the relationship between F and θ. The demonstration of the experimental device of the present invention can intuitively show that F and θ are in a sinusoidal relationship. ③ Through the sinusoidal curve image, it can be concluded that the size of the Ampere force F corresponding to any angle θ, including the change in the direction of the Ampere force F.

[0053] Figure 7 FIG. 4 shows a data relationship diagram of the Ampere force and sinθ obtained by using the Ampere force quantitative experimental device in a specific embodiment of the present invention, as shown in FIG. Figure 7 As shown, when B, I l , when L remains unchanged, the above experimental device can be used to explore the proportional relationship between F and sinθ.

[0054] Conclusion of quantitative experimental research: The magnitude of the Ampere force is proportional to the magnetic field strength, conductor current, conductor length, and the sine value of the angle between the current and the magnetic field. When all physical quantities are in international units, F 安 =BI l LSinθ. Using the above experimental device, the teacher explains the relationship between Ampere force and B and I l , L, Sinθ, θ, it will be very easy. Students have a perceptual understanding of the experimental results, which is also very helpful for students to understand and master the formula of Ampere force.

[0055] The experimental device of the present invention can comprehensively, quantitatively, intuitively and quickly measure the magnitude of the Ampere force F and the related physical quantities (B, I l , L, Sinθ, θ) relationship, F and B, I l, L, Sinθ, θ, the data is processed by computer software, and the "table data + image + equation + correlation coefficient" is quickly presented on the computer screen. Compared with the prior art, the experiment is more perfect and the operation is more controllable; especially the experiment of demonstrating the sinusoidal relationship between the Ampere force F and the angle θ between the current and the direction of the magnetic field of the conductor, the rotating disk of the present invention is designed to carry the electromagnet, which can rotate 360 ​​degrees flexibly, and the photoelectric angle sensor automatically obtains the angle data, which has good controllability. The computer quickly and completely fits the image of the relationship between F and θ sinusoidal curves, solving the difficult experimental problems that people have wanted to solve for a long time. It has the advantages of simple experimental equipment, clear demonstration objectives, and intuitive phenomena, data, and images.

[0056] Obviously, those skilled in the art can make various modifications and changes to the embodiments of the present invention without departing from the spirit and scope of the present invention. In this way, if these modifications and changes are within the scope of the claims of the present invention and their equivalents, the present invention is also intended to cover these modifications and changes. The word "comprising" does not exclude the presence of other elements or steps not listed in the claims. The simple fact that certain measures are recorded in mutually different dependent claims does not indicate that the combination of these measures cannot be used to profit. Any reference numerals in the claims should not be considered to limit the scope.

Claims

1. An Ampere force quantitative experimental device, characterized in that: It includes a coil, an electromagnet, a turntable, a bracket, a micro-force sensor, a current sensor, an angle sensor and a power supply. The bracket includes a base, a rotating support seat arranged above the base and a cantilever structure for setting the micro-force sensor. The turntable is installed on the rotating support seat. Two electromagnets are arranged on the turntable and are respectively connected to the power supply. The angle sensor is arranged at the bottom of the bracket to detect the rotation angle of the turntable. One end of the coil is suspended at the bottom of the micro-force sensor and placed in the middle of the two electromagnets. The power supply, the current sensor and the coil are connected in series to form a first loop, and the power supply and the electromagnet form a second loop. The turntable is provided with a terminal, and the terminal passes through the turntable. The electromagnet and the terminal The upper end surface of the turntable is connected by a wire, and the terminal on the lower end surface of the turntable is connected to the power supply. The rotating support seat is a cross structure, and a reinforcement portion is provided between two adjacent arms of the cross structure. The turntable is fixed on the rotating support seat, and a bearing is provided at the center of the rotating support seat, and is connected to the angle sensor provided in the middle of the base through a connecting rod. The cantilever structure is fixed on the base, and a clamp for clamping the micro-force sensor is slidably provided on the cantilever structure. The angle sensor is a photoelectric angle sensor, and the connecting rod connects the photoelectric angle sensor and the bearing. A computer is also included, and the current sensor, the angle sensor and the micro-force sensor are connected to the computer through a data acquisition signal line.

2. The Ampere force quantitative experimental device according to claim 1, characterized in that: The coil is a variable turns coil, which is a tapped coil and has at least 4 turns of taps.

3. The Ampere force quantitative experimental device according to claim 2, characterized in that: The variable turns coil comprises a square coil support, and the tap is arranged on one side of the coil support where the micro-force sensor is suspended.

4. The Ampere force quantitative experimental device according to claim 1, characterized in that: The N poles and S poles of the two electromagnets on the turntable are opposite to each other.

5. The Ampere force quantitative experimental device according to claim 1, characterized in that: The power supply is an adjustable current and voltage digital display power supply, including a first power supply for supplying power to the first circuit and a second power supply for supplying power to the second circuit.

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