Faraday law of electromagnetic induction experiment device

Abstract

The utility model belongs to the technical field of teaching equipment, and particularly relates to a Faraday's law of electromagnetic induction experiment device which comprises a base, a support, a Helmholtz coil, a rectangular coil, a rotating shaft, a first magnetic induction intensity sensor, a second magnetic induction intensity sensor, an angle sensor, a signal processing module and a display module. The base is arranged in the middle of the Helmholtz coil, the support is installed on the base, the rotating shaft is rotationally arranged on the support, the rectangular coil is installed on the rotating shaft, the first magnetic induction intensity sensor is installed in the center of the rectangular coil, the rectangular coil is located in the center of the Helmholtz coil, and the angle sensor is in transmission connection with the rotating shaft. The second magnetic induction intensity sensor is installed in the middle of the Helmholtz coil. According to the utility model, an electromagnetic induction phenomenon can be conveniently and effectively demonstrated from two aspects of'induction 'and'motional', and then a Faraday's law of electromagnetic induction experiment is demonstrated from a general situation, so that students can understand the experiment conveniently, and the classroom efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of teaching equipment, in particular to a Faraday's electromagnetic induction law experimental device. Background Art

[0002] With the advancement of teaching reform, more and more attention is paid to experimental teaching in physics teaching, advocating to help students understand knowledge through experiments rather than simply instilling knowledge. Faraday's law of electromagnetic induction experimental device is a teaching tool for experimental teaching of electromagnetic induction law in middle school physics. There are two main types of traditional Faraday's law of electromagnetic induction experimental devices: one is to use the "falling magnet method", which is a simplified verification device for the content of Faraday's law of electromagnetic induction. The coil is used to cut the magnetic flux lines to generate motional electromotive force, and the Faraday's law of electromagnetic induction is demonstrated by comparing the relationship between the electromotive force and the cutting speed. The device operation is relatively complicated, the data processing is not concise enough, and the verification and demonstration of the electromagnetic induction law is not comprehensive enough, and it is not general. The other is to use the primary coil and the secondary coil to nest, and use the signal generator or intelligent power supply to generate a uniformly changing current to pass into the primary coil to generate a uniformly changing magnetic field, thereby generating a short-term constant induced electromotive force in the secondary coil to demonstrate Faraday's law of electromagnetic induction. The disadvantage of this scheme is that it needs to be matched with a specific current, and the experiment is also not general. The above two types of experimental devices do not combine induced electromotive force with motional electromotive force, which makes the experimental teaching incomplete. Summary of the invention

[0003] The utility model provides a Faraday's law of electromagnetic induction experimental device, which can demonstrate electromagnetic induction phenomena from both "induction" and "motion" aspects to solve the technical problems mentioned in the background technology.

[0004] The technical solution of the utility model is as follows: a Faraday's law of electromagnetic induction experimental device, comprising: a base, a bracket, a Helmholtz coil, a rectangular coil, a rotating shaft, a first magnetic induction intensity sensor, a second magnetic induction intensity sensor, an angle sensor, a signal processing module and a display module;

[0005] The base is arranged in the middle of the Helmholtz coil, the bracket is installed on the base, the rotating shaft is rotatably arranged on the bracket, the rectangular coil is installed on the rotating shaft, the first magnetic induction intensity sensor is installed in the center of the rectangular coil, the rectangular coil is at the center position of the Helmholtz coil, the angle sensor is transmission-connected with the rotating shaft, and the second magnetic induction intensity sensor is installed in the middle of the Helmholtz coil;

[0006] The first magnetic induction intensity sensor, the second magnetic induction intensity sensor, the angle sensor, and the rectangular coil are all connected to the signal processing module for communication, and the display module is connected to the signal processing module for communication.

[0007] Furthermore, a conductive slip ring is provided on the rotating shaft, the output end of the first magnetic induction intensity sensor and the connecting wire of the rectangular coil are connected to the input end of the conductive slip ring, and the output end of the conductive slip ring is connected to the signal processing module.

[0008] Furthermore, the angle sensor is transmission-connected to the rotating shaft via a coupling.

[0009] Furthermore, a coil fixing frame is provided on the rotating shaft, and the rectangular coil is installed on the rotating shaft through the coil fixing frame.

[0010] Furthermore, both ends of the rotating shaft are mounted on the bracket via bearings.

[0011] Furthermore, the signal processing module includes a processor and an analog-to-digital converter, the first magnetic induction intensity sensor, the second magnetic induction intensity sensor, the angle sensor, and the rectangular coil are all connected to the input end of the analog-to-digital converter, and the output end of the analog-to-digital converter is connected to the processor.

[0012] Furthermore, the angle sensor is installed on the top of the fixing bracket, and the processor and the analog-to-digital converter are installed on the side of the fixing bracket.

[0013] Furthermore, the signal processing module also includes a wireless communication module, and the processor is communicatively connected to the display module via the wireless communication module.

[0014] Furthermore, the wireless communication module is a Bluetooth module, a WIFI module or a 4G module, and the display module is a smart phone.

[0015] Furthermore, the Helmholtz coil is connected to a power supply device, and the power supply device can provide a stable current or a variable current.

[0016] Beneficial effects of the utility model: The utility model adopts the Helmholtz coil to generate a better uniform magnetic field, providing a good magnetic field environment for the experiment. The angle sensor is used to measure the deflection angle of the coil, which cleverly solves the measurement problem of the effective area of ​​the coil and provides a new solution for the experiment. The magnetic induction intensity sensor is used to measure the magnetic induction intensity, which improves the experimental accuracy. The utility model has a simple and reliable structure and has been integrated. It can conveniently and effectively demonstrate the electromagnetic induction phenomenon from the two aspects of "induction" and "motion", and then demonstrate the Faraday's law of electromagnetic induction experiment from a general situation, which is convenient for students to understand and improves classroom efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an embodiment of the utility model. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. The described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0019] In an embodiment of the present utility model, Figure 1 It is a structural schematic diagram provided according to the specific structure of a Faraday's electromagnetic induction law experimental device of the utility model, such as Figure 1 As shown, the utility model includes:

[0020] Base 1, bracket 2, Helmholtz coil 3, rectangular coil 6, rotating shaft 4, first magnetic induction intensity sensor 7, second magnetic induction intensity sensor 15, angle sensor 12, signal processing module and display module.

[0021] The base 1 is arranged in the middle of the Helmholtz coil 3, the bracket 2 is installed on the base 1, the rotating shaft 4 is rotatably arranged on the bracket 2, and the rectangular coil 6 is installed on the rotating shaft 4. Specifically, a coil fixing frame 5 is arranged on the rotating shaft 4, and the rectangular coil 6 is installed on the rotating shaft 4 through the coil fixing frame 5.

[0022] The first magnetic induction intensity sensor 7 is installed at the center of the rectangular coil 6, and the rectangular coil 6 is located at the center of the Helmholtz coil 3. The angle sensor 12 is connected to the rotating shaft 4 by transmission. Specifically, the angle sensor 12 is connected to the rotating shaft 4 by transmission through a coupling 10. The second magnetic induction intensity sensor 15 is installed in the middle of the Helmholtz coil 3. Specifically, the second magnetic induction intensity sensor 15 is installed on the base 1 and is parallel to the Helmholtz coil 3.

[0023] The first magnetic induction intensity sensor 7, the second magnetic induction intensity sensor 15, the angle sensor 12, and the rectangular coil 6 are all connected to the signal processing module in communication, and the display module is connected to the signal processing module in communication. The first magnetic induction intensity sensor 7 is used to detect the magnetic field intensity passing through the rectangular coil, the second magnetic induction intensity sensor 15 is used to detect the magnetic field intensity of the Helmholtz coil 3, and the angle sensor 12 is used to detect the rotation speed and deflection angle of the rotating shaft. The rectangular coil 6 is connected to the signal processing module so that the signal processing module can detect the induced electromotive force generated by the rectangular coil 6.

[0024] The signal processing module collects the signals of the first magnetic induction intensity sensor 7, the second magnetic induction intensity sensor 15, the angle sensor 12, and the rectangular coil 6, so as to calculate and obtain the data such as the rate of change of magnetic induction intensity, the rate of change of the area facing the coil, and the magnetic flux, which can be displayed by the display module. In order to more intuitively display the mapping relationship between the induced electromotive force and the above data, the corresponding relationship can be displayed in a curve graph through a drawing software.

[0025] In one embodiment of the utility model, a conductive slip ring 8 is provided on the rotating shaft 4, the output end of the first magnetic induction intensity sensor 7 and the connecting wire of the rectangular coil 6 are connected to the input end of the conductive slip ring 8, and the output end of the conductive slip ring 8 is connected to the signal processing module. The function of the conductive slip ring 8 is to ensure that the data line, the power line of the first magnetic induction intensity sensor 7 and the connecting wire of the rectangular coil 6 will not be knotted during the rotation of the rotating shaft 4.

[0026] In one embodiment of the utility model, the signal processing module includes a processor 14 and an analog-to-digital converter 13, the first magnetic induction intensity sensor 7, the second magnetic induction intensity sensor 15, the angle sensor 12, and the rectangular coil 6 are all connected to the input end of the analog-to-digital converter 13, and the output end of the analog-to-digital converter 13 is connected to the processor 14. The processor can be ESP32-S3. Specifically, the angle sensor 12 is installed at the top of the fixed bracket 11, and the processor 14 and the analog-to-digital converter 13 are installed on the side of the fixed bracket 11.

[0027] Specifically, the signal processing module also includes a wireless communication module, and the processor 14 is connected to the display module through the wireless communication module. The wireless communication module can be a Bluetooth module, a WIFI module or a 4G module, and the display module can be a smart phone. The smart phone is used as a data receiving end to facilitate display and experimental demonstration. The processor uses the ESP32-S3 module as the data processing core, which solves the sensor drive and data processing calculation problems, and can send data through its Bluetooth function.

[0028] In one embodiment of the present invention, the Helmholtz coil 3 is connected to a power supply device, and the power supply device can provide a stable current or a variable current.

[0029] The rectangular coil 6 and the conductive slip ring 8 of the utility model are fixed on the rotating shaft 4 and fixed to the bracket 2 through the bearing 9. The angle sensor 12 is fixed on the fixed bracket 11 and is connected to the rotating shaft 4 through the coupling 10. The second magnetic induction intensity sensor 15 is fixed on the base 1, and the first magnetic induction intensity sensor 7 is fixed in the middle of the rectangular coil 6. The analog-to-digital converter 13 and the processor 14 are fixed on the side of the fixed bracket 11. The tap of the rectangular coil 6 is connected to the input end of the conductive slip ring 8, and the power supply line and signal line of the first magnetic induction intensity sensor 7 are connected to the input end of the conductive slip ring 8, and the connecting line is connected to the input end of the analog-to-digital converter 13 through the output end of the conductive slip ring 8. The analog-to-digital converter 13 is connected to the processor 14. The base bracket with the rectangular coil and the sensor and other components fixed is placed in the middle of the Helmholtz coil 3, and the rectangular coil is located in the center of the Helmholtz coil.

[0030] The working principle of this utility model:

[0031] 1. Keep the coil still and pass a changing current through the Helmholtz coil. At this time, a changing uniform magnetic field is generated in the center of the Helmholtz coil, and an induced electromotive force is generated in the rectangular coil. The second magnetic induction intensity sensor 15 first measures the magnetic induction intensity B1 and B2 corresponding to the two moments t1 and t2, and the processor calculates Δt=t2-t1 and ΔB=B2-B1 and calculates the average rate of change within the Δt time interval Due to the use of high-speed sensors, the value of Δt can be very small, even in the millisecond level, so the average rate of change at this time can be regarded as the instantaneous rate of change. The induced electromotive force E and the rate of change of the magnetic induction intensity of the rectangular coil at a certain time t are measured and calculated simultaneously using an analog-to-digital converter and a second magnetic induction intensity sensor. The time t, the induced electromotive force E and the rate of change of the magnetic induction intensity at the corresponding time The data is sent to the smartphone via wireless transmission methods such as Bluetooth and WIFI. Phyphox software is used on the smartphone to draw real-time graphs, and Et graphs, Figure and relationship diagram.

[0032] 2. Keep the current flowing through the Helmholtz coil unchanged and rotate the rectangular coil manually. At this time, an induced electromotive force is generated in the rectangular coil. Use the angle sensor to measure the angles θ1 and θ2 between the plane where the rectangular coil is located and the direction of the magnetic field at the two moments t1 and t2. The processor calculates Δt=t2-t1 and the change in the area facing the rectangular coil ΔS=S sinθ1-S sinθ2, and calculates the change rate of the area facing the rectangular coil The induced electromotive force E and the rate of change of the area facing the rectangular coil at a certain time t are measured and calculated simultaneously using the analog-to-digital converter and the angle sensor. The time t, the induced electromotive force E and the rate of change of the area of ​​the rectangular coil at the corresponding time The data is sent to the smartphone via wireless transmission methods such as Bluetooth and WIFI. The Et graph, Figure and relationship diagram.

[0033] 3. By passing a changing current through the Helmholtz coil and rotating the rectangular coil at the same time, the magnetic induction intensity and B corresponding to a certain moment can be measured by the second magnetic induction intensity sensor 15, and the angle sensor can measure the angle θ between the plane where the rectangular coil is located and the direction of the magnetic field. The magnetic flux can be calculated by the processor. Where S is the area of ​​the rectangular coil. The magnetic flux corresponding to the two moments t1 and t2 is measured and calculated using the second magnetic induction intensity sensor and the angle sensor. and Thus, we can calculate And Δt = t2-t1, so as to calculate the rate of change of magnetic flux at a certain moment The induced electromotive force E and the rate of change of magnetic flux at a certain moment are measured and calculated using an analog-to-digital converter, a magnetic induction intensity sensor and an angle sensor. The time t, the induced electromotive force E and the rate of change of magnetic flux at the corresponding time The data is sent to the smartphone via wireless transmission methods such as Bluetooth and WIFI, and the phyphox software is used on the smartphone to draw a graph to obtain the Et graph, Figure and relationship diagram.

[0034] 4. A changing current is passed through the Helmholtz coil and the rectangular coil is rotated at the same time. The first magnetic induction intensity sensor 7 in the middle of the rectangular coil measures the magnetic induction intensity B in the direction facing the rectangular coil, and the magnetic flux is calculated by the processor. Where S is the area of ​​the rectangular coil. The magnetic flux corresponding to the two moments t1 and t2 is measured and calculated using the first magnetic induction intensity sensor 7. and Thus, we can calculate And Δt = t2-t1, so as to calculate the rate of change of magnetic flux at a certain moment The induced electromotive force E and the rate of change of magnetic flux at a certain time t are measured and calculated simultaneously by using the analog-to-digital converter and the first magnetic induction intensity sensor. The time t, the induced electromotive force E and the rate of change of magnetic flux at the corresponding time The data is sent to the smartphone via wireless transmission methods such as Bluetooth and WIFI, and the phyphox software is used on the smartphone to draw a graph to obtain the Et graph, Figure and relationship diagram.

[0035] In summary, the utility model provides a Faraday's law of electromagnetic induction experimental device, including: a base, a bracket, a Helmholtz coil, a rectangular coil, a rotating shaft, a first magnetic induction intensity sensor, a second magnetic induction intensity sensor, an angle sensor, a signal processing module and a display module; the base is arranged in the middle of the Helmholtz coil, the bracket is mounted on the base, the rotating shaft is rotatably arranged on the bracket, the rectangular coil is mounted on the rotating shaft, the first magnetic induction intensity sensor is mounted in the center of the rectangular coil, the rectangular coil is at the center of the Helmholtz coil, the angle sensor is connected to the rotating shaft in a transmission manner, and the second magnetic induction intensity sensor is mounted in the middle of the Helmholtz coil. In this way, the electromagnetic induction phenomenon can be conveniently and effectively demonstrated from the two aspects of "induction" and "motion", and then the Faraday's law of electromagnetic induction experiment can be demonstrated from a general situation, so as to facilitate students' understanding and improve classroom efficiency.

[0036] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to examples, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A Faraday's law of electromagnetic induction experimental device, characterized in that: include: A base (1), a bracket (2), a Helmholtz coil (3), a rectangular coil (6), a rotating shaft (4), a first magnetic induction intensity sensor (7), a second magnetic induction intensity sensor (15), an angle sensor (12), a signal processing module, and a display module; The base (1) is arranged in the middle of the Helmholtz coil (3), the bracket (2) is mounted on the base (1), the rotating shaft (4) is rotatably arranged on the bracket (2), the rectangular coil (6) is mounted on the rotating shaft (4), the first magnetic induction intensity sensor (7) is mounted at the center of the rectangular coil (6), the rectangular coil (6) is located at the center position of the Helmholtz coil (3), the angle sensor (12) is transmission-connected to the rotating shaft (4), and the second magnetic induction intensity sensor (15) is mounted in the middle of the Helmholtz coil (3); The first magnetic induction intensity sensor (7), the second magnetic induction intensity sensor (15), the angle sensor (12), and the rectangular coil (6) are all communicatively connected to the signal processing module, and the display module is communicatively connected to the signal processing module.

2. The Faraday's law of electromagnetic induction experimental device as claimed in claim 1, characterized in that: A conductive slip ring (8) is provided on the rotating shaft (4); the output end of the first magnetic induction intensity sensor (7) and the connecting wire of the rectangular coil (6) are connected to the input end of the conductive slip ring (8); and the output end of the conductive slip ring (8) is connected to a signal processing module.

3. The Faraday's law of electromagnetic induction experimental device as claimed in claim 1, characterized in that: The angle sensor (12) is transmission-connected to the rotating shaft (4) via a coupling (10).

4. The Faraday's law of electromagnetic induction experimental device as claimed in claim 1, characterized in that: A coil fixing frame (5) is provided on the rotating shaft (4), and the rectangular coil (6) is mounted on the rotating shaft (4) via the coil fixing frame (5).

5. The Faraday's law of electromagnetic induction experimental device as claimed in claim 1, characterized in that: Both ends of the rotating shaft (4) are mounted on the bracket (2) via bearings (9).

6. The Faraday's law of electromagnetic induction experimental device as claimed in claim 1, characterized in that: The signal processing module comprises a processor (14) and an analog-to-digital converter (13); the first magnetic induction intensity sensor (7), the second magnetic induction intensity sensor (15), the angle sensor (12), and the rectangular coil (6) are all connected to an input end of the analog-to-digital converter (13); and an output end of the analog-to-digital converter (13) is connected to the processor (14).

7. The Faraday's law of electromagnetic induction experimental device as claimed in claim 6, characterized in that: The angle sensor (12) is mounted on the top of the fixed bracket (11), and the processor (14) and the analog-to-digital converter (13) are mounted on the side of the fixed bracket (11).

8. The Faraday's law of electromagnetic induction experimental device as claimed in claim 6, characterized in that: The signal processing module further comprises a wireless communication module, and the processor (14) is communicatively connected with the display module via the wireless communication module.

9. The Faraday's law of electromagnetic induction experimental device as claimed in claim 8, characterized in that: The wireless communication module is a Bluetooth module, a WIFI module or a 4G module, and the display module is a smart phone.

10. The Faraday's law of electromagnetic induction experimental device as claimed in claim 1, characterized in that: The Helmholtz coil (3) is connected to a power supply device, which can provide a stable current or a variable current.

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