Magnetic field driving mechanism and teaching device thereof

Abstract

The utility model discloses a magnetic field driving mechanism, which belongs to the technical field of electromagnetic induction, solves the defect that an electromagnetic induction device in the prior art can only drive a conductor to move, and comprises a driver and a rotating disc, magnets are arranged on the rotating disc, and the magnetic pole directions of the adjacent magnets are opposite. In addition, the utility model further provides a teaching device based on the driving mechanism, the teaching device comprises the driving mechanism and a display mechanism, the driving mechanism drives the magnetic field to rotate, and the display mechanism displays the magnetic field. The display mechanism displays the electromagnetic induction effect by cutting magnetic induction lines through an internal conductor, the display mechanism displays the electromagnetic induction phenomenon at different angles through lighting, temperature rise, rotation of a rotating piece and color change of a temperature sensing material, and the teaching effect is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of electromagnetic induction, and specifically relates to a magnetic field driving mechanism and a teaching device thereof. Background Art

[0002] The Faraday electromagnetic induction device is a device in which a conductor cuts the magnetic flux lines in a magnetic field to generate an electric current. In the prior art, the Faraday electromagnetic induction technology is widely used. For example, motors, transformers, etc. have adopted this technology to achieve industrial promotion. The Faraday electromagnetic induction device includes a magnet and the magnetic field it generates, as well as a conductor in a closed circuit. The conductor moves in the magnetic field generated by the magnet to cut the magnetic flux lines to generate an electric current. In the process of physics teaching, in order to better demonstrate the phenomenon of electromagnetic induction, the electromagnetic induction device is an indispensable teaching tool in teaching equipment.

[0003] There are various types of electromagnetic induction teaching aids in the prior art. For example, Chinese invention patent CN111243402A applied for by Hunan Changqing Electromechanical Science and Education Co., Ltd. discloses an electromagnetic induction experimental table for physics teaching. The experimental table includes a fixing part, a cutting part and a display. The fixing part includes magnets arranged relatively to each other. The cutting part includes a rotating ring and a rotating ring bracket for supporting the rotating ring. The rotating ring bracket is connected to a rotating shaft, and the rotating shaft is connected to a motor. The rotating ring is a non-metallic hollow cylindrical ring. A plurality of metal wires are evenly distributed on the inner wall of the rotating ring along the axial direction. A light-emitting diode is arranged in the metal wire. A current sensor is arranged at one end of the metal wire. The sensor is connected to a display for communication. The motor in the experimental table can drive the rotating ring to rotate. When the rotating ring rotates, it drives the metal wire to rotate. During the rotation process, the metal wire passes through the gap between the relatively arranged magnets to cut the magnetic flux lines to generate current. The current is displayed through the current sensor and the display, thereby intuitively showing the phenomenon that the conductor cuts the magnetic flux lines to generate current.

[0004] Although the above-mentioned test bench can clearly demonstrate the phenomenon that the conductor movement cuts the magnetic flux lines to generate current, the above-mentioned test bench still has the following problems during use: since the movement of the conductor in the closed circuit composed of the conductor is that the rotating ring drives the metal wire to rotate and passes through the gap of the relatively arranged magnets to cut the magnetic flux lines, the moving object is the conductor, and the position of the magnet is fixed. In some electromagnetic induction devices, the conductor in the closed circuit composed of the conductor cannot move. Therefore, it is necessary to design a power mechanism that can drive the magnetic field movement in the electromagnetic induction device. Utility Model Content

[0005] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0006] To solve the above problems, the utility model adopts the following technical solutions.

[0007] On one hand, the utility model provides a magnetic field driving mechanism, and the specific technical solution is as follows.

[0008] A magnetic field driving mechanism includes a driver and a rotating disk mounted on the power end of the driver. Magnets are distributed in an annular pattern on the surface of the rotating disk. The magnetic poles of adjacent magnets are in opposite directions. The driver drives the rotating disk to rotate, which in turn drives the magnets and the magnetic field generated by the magnets to rotate.

[0009] Preferably, in the above-mentioned magnetic field drive mechanism, the rotating shaft of the power end of the driver is connected to the rotating disk by a connecting member, and the connecting member includes a vertical part and a horizontal part. The vertical part is sleeved on the rotating shaft of the driver and is relatively fixed to the rotating shaft, and the rotating disk is attached to the surface of the horizontal part and is relatively fixed to the horizontal part.

[0010] On the other hand, the utility model provides a teaching device, and the specific technical solution is as follows.

[0011] A teaching device includes the magnetic field driving mechanism and a display mechanism. When the driver drives the magnetic field to rotate, the conductor in the display mechanism cuts the magnetic flux lines in the magnetic field and displays the electromagnetic induction phenomenon through the display mechanism.

[0012] Preferably, in the above-mentioned teaching device, the display mechanism is a coil and a light-emitting lamp, the coil is located directly above the magnet, the light-emitting lamp is connected to the coil through a wire, and a closed circuit is formed between the light-emitting lamp and the light-emitting coil.

[0013] Preferably, in the above-mentioned teaching device, when the projection of the coil viewed from above on the surface of the rotating disk includes an odd number of magnets, the magnet rotating coil cuts the magnetic flux lines in the magnetic field to generate current, causing the light to light up; when the projection of the coil viewed from above on the surface of the rotating disk includes an even number of magnets, the magnet rotating coil cuts the magnetic flux lines in the magnetic field to cancel out the magnetic flux, no current is generated, and the light does not emit light.

[0014] Preferably, in the above-mentioned teaching device, the display mechanism is a temperature sensing device, which includes a supporting plate and a capacity container, the capacity container is equipped with a built-in electric heat conductor, and a liquid medium is injected into the capacity container, and a temperature measuring mechanism is connected to the capacity container, and the temperature measuring mechanism is used to measure the temperature of the liquid medium in the capacity container.

[0015] Preferably, in the above-mentioned teaching device, when the magnet rotates, the electric heating conductor cuts the magnetic flux lines in the magnetic field of the magnet to generate electric current and generate heat, and the liquid medium absorbs heat and the temperature rises, which is displayed by the temperature measuring mechanism.

[0016] Preferably, in the above-mentioned teaching device, the display mechanism is a rotating mechanism, which includes a support plate and a rotating part. The rotating part is placed on the surface of the support plate, and the contact surface between the rotating part and the support plate is an arc-shaped structure. The rotating part is a conical structure with an opening at the top and a hollow interior, and a layered structure made of non-magnetic conductive material is adhered to the inner wall.

[0017] Preferably, in the above-mentioned teaching device, when the magnet rotates, the layered structure cuts the magnetic flux lines in the magnetic field of the magnet to generate eddy currents to drive the rotating member to rotate.

[0018] Preferably, in the above-mentioned teaching device, the display mechanism is a thermochromic board, which is a conductor plate-like structure, and the surface of the conductor plate-like structure is coated with a thermochromic material to form the thermochromic board, and the electromagnetic induction phenomenon of the thermochromic board is a color change.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] (1) The utility model provides a magnetic field driving mechanism, including a driver and a rotating disk for assembling a magnet. The driver drives the rotating disk to rotate, thereby driving the magnet to rotate, thereby realizing the movement of the magnetic field, avoiding the disadvantage of the electromagnetic induction device in the prior art that only the conductor can move. In addition, the magnetic poles of adjacent magnets are in opposite directions, which is convenient for demonstrating the electromagnetic induction phenomenon and the phenomenon of mutual cancellation of magnetic fluxes. In addition, the rotating disk and the driver in the utility model are connected with a homologous connecting piece, which ensures the smooth rotation of the rotating disk and avoids the problem of magnetic field swing.

[0021] (2) Based on the above-mentioned magnetic field driving mechanism, the present invention provides a teaching device, which drives the magnetic field to move through the above-mentioned driving mechanism, and cooperates with a display mechanism to display the electromagnetic induction phenomenon. The display mechanism of the device is of various types, including a coil cutting magnetic flux lines to generate current so that the light-emitting lamp lights up, a temperature sensing device so that the conductor cuts the magnetic flux lines to generate heat so that the temperature rises, a rotating mechanism, in which the conductor in the rotating mechanism cuts the magnetic flux lines to cause the rotating part to rotate, and a temperature-sensitive color-changing mechanism, which causes the conductor to heat and change color by cutting the magnetic flux lines. Therefore, the teaching device in the present invention demonstrates the effect of electromagnetic induction from different phenomena, thereby ensuring the teaching effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a structural schematic diagram of the magnetic field driving mechanism in the utility model;

[0023] Figure 2 for Figure 1 Schematic diagram of the split structure;

[0024] Figure 3 It is a schematic diagram of the magnetic pole distribution of the magnet in the utility model;

[0025] Figure 4 for Figure 2 Schematic diagram of the structure of the connecting parts;

[0026] Figure 5 It is a structural schematic diagram of the teaching device of Example 1 of the present utility model and an enlarged diagram of its local structure;

[0027] Figure 6 for Figure 5 A top view of

[0028] Figure 7 It is a structural schematic diagram of the teaching device of Example 2 of the present utility model;

[0029] Figure 8 This is a schematic diagram of the structure of the teaching device of Example 3 of the present utility model;

[0030] Fig. 9 for Figure 8 A top view of

[0031] Fig.10 for Fig. 9 A schematic diagram of the structure of the rotating part;

[0032] Fig.11 It is a structural schematic diagram of the teaching device of Example 4 in the utility model.

[0033] The corresponding relationship between the illustrations and component names in the figure is as follows:

[0034] 100. Driver;

[0035] 101. rotating disk; 102. connecting member;

[0036] 101a, magnet; 102a, vertical portion; 102b, horizontal portion;

[0037] 200, coil;

[0038] 200a, luminous lamp;

[0039] 300. Temperature sensing device;

[0040] 301, supporting plate; 302, capacity container; 303, electric heating conductor;

[0041] 400, rotating mechanism;

[0042] 401, support plate; 402, rotating member; 403, aluminum foil layer;

[0043] 500. Thermochromic plate. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0045] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0046] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. The present invention provides the following embodiments.

[0047] like Figure 1 as well as Figure 2 As shown, it is a structural schematic diagram of the magnetic field driving mechanism in the utility model. The driving mechanism in this embodiment can drive the magnetic field to move, thereby solving the problem that the magnetic field cannot move in the prior art. The driving mechanism in the utility model includes a driver 100 and a rotating disk 101 assembled on the driver 100. The driver 100 is connected to the rotating disk 101 through a rotating shaft. The driver 100 can be a motor or other mechanism. When the driver 100 is working, it can drive the rotating disk 101 on its top to rotate.

[0048] In the present invention, a plurality of magnets 101a are distributed in an annular manner on the surface of the rotating disk 101. Each magnet 101a has its own independent magnetic field. The rotating disk 101 drives the magnets 101a on its surface to rotate during the rotation process, so that the magnetic field generated by the rotating disk 101 can achieve rotation. It is worth noting that in this embodiment, the magnetic poles of adjacent magnets 101a are opposite in direction. For example, if the magnetic pole on the surface of one magnet 101a is the N pole, the magnetic pole on the surface of the adjacent magnet 101a is the S pole. The distribution is as follows: Figure 3 shown.

[0049] In this embodiment, when the working room of the driver 100 drives the rotating disk 101 and the magnet 101a on its surface to rotate, the magnetic field generated by the magnet 101a moves synchronously with the magnet 101a, which solves the problem that the magnetic field cannot move in the prior art. When the magnetic field in the utility model moves, it can cut the conductor in a stationary state in the closed circuit and still produce the phenomenon of Faraday electromagnetic induction.

[0050] In the present invention, in order to avoid the problem of swinging of the rotating disk 101 when it rotates, a connecting member 102 is connected to the top of the rotating shaft in the driver 100 of the present invention, and the rotating disk 101 is fixedly connected to the connecting member 102, so that the driver 100 drives the connecting member 102 and the rotating disk 101 to rotate. Figure 4 As shown, the connecting member 102 in the present invention includes a vertical portion 102a and a horizontal portion 102b. The horizontal portion 102b and the vertical portion 102a are integrally formed, and the vertical portion 102a is a hollow cylindrical structure. A locking hole is provided on the side wall of the vertical portion 102a. The connecting member 102 is sleeved on the rotating shaft of the driver 100 through the vertical portion 102a and is locked on the rotating shaft by the cooperation of bolts and the locking hole. Therefore, when the driver 100 is working, it drives the rotating shaft and the connecting member 102 to rotate. In the present invention, the rotating disk 101 is attached to the surface of the horizontal portion 102b and is relatively fixed to the horizontal portion 102b by bolts.

[0051] In the utility model, the driver 100 drives the connecting member 102 and the rotating disk 101 to rotate. Since the rotating disk 101 and the horizontal portion 102b are relatively fixed and fit together, the rotating disk 101 avoids swinging during the rotation process, thereby ensuring the stability of the magnet 101a during the rotation process.

[0052] The utility model is based on the above-mentioned driving mechanism and cooperates with the display device to form an electromagnetic induction teaching device. The driving mechanism drives the magnetic field to move, and the display device is used to display the phenomenon caused by cutting the magnetic flux lines for teaching. The following embodiments are different teaching devices given based on the above-mentioned driving mechanism.

[0053] Example 1

[0054] like Figure 5 as well as Figure 6 As shown, it is a structural diagram of the teaching device in this embodiment. The teaching device in this embodiment includes the above-mentioned driving mechanism, and also includes a coil 200 and a light-emitting lamp 200a. The light-emitting lamp 200a is connected to the coil 200 through a wire, and a closed circuit is formed between the light-emitting lamp 200a, the wire and the coil 200.

[0055] In this embodiment, the coil 200 is located directly above the magnet 101a. It is worth noting that the projection of the coil 200 in this embodiment on the surface of the rotating disk 101 includes an odd number of magnets 101a, and the effect is as follows: Figure 6 As shown, in this embodiment, when the driver 100 drives the rotating disk 101 and the magnet 101a to rotate, the magnet 101a rotates synchronously with the magnetic field generated by it, cutting the coil 200 to generate current, and the light 200a lights up.

[0056] In order to further improve the teaching effect, the teaching device in this embodiment also includes a comparative example, that is, the teaching device includes a coil 200, and the projection of the coil 200 on the surface of the rotating disk 101 includes an even number of magnets 101a, and the effect is as follows: Figure 6 As shown, since the magnetic poles of adjacent magnets 101a are in opposite directions, the magnetic fluxes cancel each other out when the magnetic field is cut, and no current is generated, and the light emitting lamp 200a does not light up. The effect is as follows: Figure 6 As shown. In addition, it is worth noting that the magnitude of the current in this embodiment is related to the distance between the coil 200 and the magnet 101a. When the distance is small, the coil 200 is closer to the magnet 101a, the magnetic flux is larger, the current generated is larger, and the brightness of the light emitting lamp 200a is brighter. Therefore, in order to ensure the teaching effect, in this embodiment, the distance between the coil 200 and the magnet 101a is 1-5mm, preferably 2mm. On the one hand, it avoids the problem that the distance between the coil 200 and the magnet 101a is too close during teaching, which may cause the coil 200 and the magnet 101a to collide and interfere with each other. On the other hand, it also avoids the problem that the distance between the coil 200 and the magnet 101a is too far, which may cause the light emitting lamp 200a to be not bright enough.

[0057] In this embodiment, only when the projection of the coil 200 on the surface of the rotating disk 101 includes an odd number of magnets 101a, the magnetic fluxes will not cancel each other out, and current can be generated by cutting the magnetic lines of force to light up the light 200a. The teaching device in this embodiment can demonstrate the phenomenon of electromagnetic induction on the one hand, and on the other hand, it can also demonstrate the phenomenon caused by the mutual cancellation of magnetic fluxes, and has a good teaching effect.

[0058] Example 2

[0059] like Figure 7As shown, it is a structural schematic diagram of the teaching device in this embodiment. The teaching device in this embodiment, on the basis of the above-mentioned driving mechanism, also includes a temperature sensing device 300. The temperature sensing device 300 includes a supporting plate 301. The supporting plate 301 is located directly above the magnet 101a, and the distance between the supporting plate 301 and the magnet 101a is 1-5mm, preferably 2mm. In this embodiment, a capacity container 302 is arranged on the supporting plate 301, and a heat conductive sheet 303 is placed at the bottom of the capacity container 302, and a liquid, such as water or other media, is injected into the capacity container 302. The temperature sensing device 300 in this embodiment also includes a temperature measuring mechanism, which is used to measure the temperature of the liquid in the capacity container 302.

[0060] In this embodiment, when the rotating disk 101 drives the magnet 101a to rotate, the electric heat conducting sheet 303 cuts the magnetic flux lines to generate heat and transfers it to the liquid medium. The liquid medium absorbs the heat and the temperature rises, which is displayed by the temperature measuring mechanism. The teaching device in this embodiment can intuitively feel the electromagnetic induction phenomenon through the temperature sensing device 300.

[0061] Example 3

[0062] like Figure 8 as well as Fig. 9 As shown, it is a structural schematic diagram of the teaching device in this embodiment. The teaching device in this embodiment, based on the above-mentioned driving mechanism, also includes a rotating mechanism 400. The rotating mechanism 400 includes a support plate 401. The support plate 401 is located directly above the magnet 101a, and the distance between the support plate 401 and the magnet 101a is 1-5mm, preferably 2mm. In this embodiment, a rotating member 402 is also placed on the surface of the support plate 401. The rotating member 402 is a conical structure with an internal hollow surface and an open surface, and an aluminum foil layer 403 is attached to the inner wall of the rotating member 402. When the magnet 101a rotates with the rotating disk 101, the aluminum foil layer 403 cuts the magnetic flux lines, thereby causing eddy currents to occur inside the aluminum foil, thereby realizing that the aluminum foil layer 403 drives the rotating member 402 to rotate on the surface of the support plate 401.

[0063] In this embodiment, in order to ensure the rotation effect of the rotating part 402, the rotating part 402 is made of lightweight materials, such as paper, etc. In addition, the inner wall of the rotating part 402 includes but is not limited to an aluminum foil layer, and can also be a layered structure composed of other non-magnetic conductive materials.

[0064] In order to ensure the rotation effect of the rotating member 402, as Fig.10 As shown, the bottom of the rotating member 402 in this embodiment is an arc-shaped structure, so that the rotating member 402 can be driven to rotate even when the eddy current generated by the aluminum foil layer 403 cutting the magnetic flux lines is small.

[0065] Example 4

[0066] like Fig.11 As shown, the teaching device in this embodiment, based on the above-mentioned driving mechanism, also includes a temperature-sensitive color-changing plate 500. The temperature-sensitive color-changing plate 500 is located directly above the magnet 101a, and the distance between the temperature-sensitive color-changing plate 500 and the magnet 101a is 1-5mm, preferably 2mm. The temperature-sensitive color-changing plate 500 in this embodiment includes a plate-like substrate with a built-in conductor and a temperature-sensitive material coated on the surface of the substrate. When the magnet 101a rotates, the plate-like substrate of the conductor cuts the magnetic flux lines to generate heat, causing the temperature of the substrate to rise. The temperature-sensitive material on the surface of the substrate changes color due to the increase in temperature, so that the temperature-sensitive color-changing plate 500 changes color when the magnet 101a rotates, and the phenomenon of electromagnetic induction can be intuitively felt.

[0067] In the above embodiments, different display mechanisms are used to display the electromagnetic induction phenomenon on the basis of the above driving mechanism, thereby achieving a better teaching effect.

[0068] The above content is a further detailed description of the utility model in combination with specific implementation methods. It cannot be determined that the specific implementation of the utility model is limited to these descriptions. For ordinary technicians in the technical field to which the utility model belongs, without departing from the concept of the utility model, they can also make several simple deductions or substitutions, which should be regarded as belonging to the scope of protection determined by the claims submitted for the utility model.

Claims

1. A magnetic field driving mechanism, comprising a driver (100) and a rotating disk (101) mounted on a power end of the driver (100), wherein magnets (101a) are distributed in an annular shape on the surface of the rotating disk (101), characterized in that: The magnetic poles of adjacent magnets (101a) are in opposite directions, and the driver (100) drives the rotating disk (101) to rotate, thereby driving the magnets (101a) and the magnetic field generated by the magnets (101a) to rotate.

2. The magnetic field driving mechanism according to claim 1, characterized in that: The rotating shaft of the power end of the driver (100) is connected to the rotating disk (101) via a connecting member (102). The connecting member (102) comprises a vertical portion (102a) and a horizontal portion (102b). The vertical portion (102a) is sleeved on the rotating shaft of the driver (100) and is relatively fixed to the rotating shaft. The rotating disk (101) is attached to the surface of the horizontal portion (102b) and is relatively fixed to the horizontal portion (102b).

3. A teaching device, comprising the magnetic field driving mechanism according to claim 1, characterized in that: It also includes a display mechanism. When the driver (100) drives the magnetic field to rotate, the conductor in the display mechanism cuts the magnetic flux lines in the magnetic field and displays the electromagnetic induction phenomenon through the display mechanism.

4. The teaching device according to claim 3, characterized in that: The display mechanism comprises a coil (200) and a light-emitting lamp (200a); the coil (200) is located directly above the magnet (101a); the light-emitting lamp (200a) is connected to the coil (200) via a wire; a closed circuit is formed between the light-emitting lamp (200a) and the light-emitting coil (200).

5. The teaching device according to claim 4, characterized in that: When the projection of the coil (200) viewed from above on the surface of the rotating disk (101) includes an odd number of magnets (101a), the magnets (101a) rotate the coil (200) to cut the magnetic flux lines in the magnetic field to generate current, so that the light-emitting lamp (200a) lights up; when the projection of the coil (200) viewed from above on the surface of the rotating disk (101) includes an even number of magnets (101a), the magnets (101a) rotate the coil (200) to cut the magnetic flux lines in the magnetic field to cancel out the magnetic flux, so that no current is generated and the light-emitting lamp (200a) does not emit light.

6. The teaching device according to claim 3, characterized in that: The display mechanism is a temperature sensing device (300), the temperature sensing device (300) comprising a supporting plate (301) and a container (302), the container (302) having a built-in electric heat conducting sheet (303), and a liquid medium injected into the container (302), the container (302) being connected to a temperature measuring mechanism, and the temperature measuring mechanism being used to measure the temperature of the liquid medium in the container (302).

7. The teaching device according to claim 6, characterized in that: When the magnet (101a) rotates the electric heat conducting plate (303) to cut the magnetic flux lines in the magnetic field of the magnet (101a) to generate electric current and generate heat, the liquid medium absorbs heat and the temperature rises, which is displayed by the temperature measuring mechanism.

8. The teaching device according to claim 3, characterized in that: The display mechanism is a rotating mechanism (400), the rotating mechanism (400) comprises a support plate (401) and a rotating member (402), the rotating member (402) is placed on the surface of the support plate (401), and the contact surface between the rotating member (402) and the support plate (401) is an arc-shaped structure, the rotating member (402) is a cone-shaped structure with an open top and a hollow interior, and a layered structure composed of a non-magnetic conductive material is attached to the inner wall.

9. The teaching device according to claim 8, characterized in that: When the magnet (101a) rotates, the layered structure cuts the magnetic flux lines in the magnetic field of the magnet (101a) to generate eddy currents, driving the rotating member to rotate.

10. The teaching device according to claim 3, characterized in that: The display mechanism is a thermochromic plate (500), which is a conductor plate-like structure, and a surface of the conductor plate-like structure is coated with a thermochromic material to form the thermochromic plate (500), and the electromagnetic induction phenomenon of the thermochromic plate (500) is a color change.

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