Dual-loop integrated electromagnetic induction explorer

Abstract

The utility model discloses a double loop integrated formula electromagnetic induction research instrument belongs to physical teaching instrument technical field, including bottom plate, telescopic shuttle motor, strong magnet, subsection coil and the PVC board that has integrated double loop circuit, motor drives strong magnet uniform speed shuttle movement in the coil, and the first loop of first switch control shows induction current direction through different color emitting diode, and the second loop of second switch control shows induction electromotive force size through the luminance change of series emitting diode. The utility model converts abstract electromagnetic rule into visual signal directly, and the demonstration of integrating lenz law and faraday law is simple to operate, and the result can be repeated, and the teaching efficiency and effect are effectively promoted.

Description

Technical Field

[0001] This utility model relates to the field of physics teaching instrument technology, and in particular to a dual-loop integrated electromagnetic induction exploration instrument. Background Technology

[0002] In high school physics teaching, related experimental demonstrations are often conducted to help students understand Faraday's law of electromagnetic induction and Lenz's law. A classic experimental setup typically consists of a coil, a bar magnet, and an instrument (such as a galvanometer or voltmeter) for detecting induced electromotive force or induced current. During the experiment, the teacher manually inserts or removes the magnet from the coil, or allows the magnet to fall freely through the coil, thereby changing the magnetic flux through the closed loop. This induces an electromotive force and current in the coil, and the changes in the instrument readings are then observed to verify the relevant laws.

[0003] The observation of experimental phenomena relies on the deflection of the instrument pointer. Because the induction process is usually very rapid, the induced electromotive force (EMF) generated lasts only a short time, causing the instrument pointer to swing only momentarily, making it difficult for students to accurately capture and read the instantaneous maximum value. Especially when using a standard voltmeter with a large range, the pointer deflection caused by the weak induced EMF is too small, making the phenomenon very inconspicuous. This makes qualitative and even semi-quantitative analysis of the magnitude of the induced EMF extremely difficult and not very intuitive.

[0004] The magnitude of the induced electromotive force (EMF) is directly related to the rate of change of magnetic flux, which in turn is related to the velocity of the magnet relative to the coil. In traditional experiments, whether the magnet is manually moved or allowed to fall freely, it is difficult to guarantee that the magnet passes through the coil at a stable and repeatable uniform speed. The speed of manual operation is difficult to control and varies from person to person, while free fall is a variable process with constantly changing acceleration. This uncertainty and instability in velocity poses a significant challenge to exploring the direct proportionality between induced EMF and velocity, weakening the persuasiveness of experimental conclusions.

[0005] When it is necessary to investigate the relationship between induced electromotive force and the number of turns of a coil, the experiment must be interrupted, and the coil must be physically disassembled and replaced with one of different numbers of turns. This process is not only tedious and time-consuming, disrupting the continuity of teaching, but also prone to introducing uncertainties such as poor contact during repeated disassembly and rewiring, affecting the experimental results.

[0006] To address these issues, a dual-loop integrated electromagnetic induction research instrument is proposed. Utility Model Content

[0007] To overcome the above shortcomings, this utility model provides a dual-loop integrated electromagnetic induction research instrument, which aims to improve the problems of existing electromagnetic induction experimental devices, such as unintuitive experimental phenomena, unstable magnet movement speed, complex operation and control, and cumbersome switching of experimental conditions.

[0008] This utility model provides a dual-loop integrated electromagnetic induction research instrument, comprising: a wooden base plate, a transparent acrylic tube with coils wound around it, and a strong magnet disposed inside the transparent acrylic tube.

[0009] It also includes a telescopic reciprocating motor for driving the movement of the strong magnet, and a PVC board integrating a dual-circuit circuit system, which includes a light-emitting diode, a first switch, a second switch, and conductive copper foil tape.

[0010] The telescopic reciprocating motor is fixed to the wooden base plate, and its telescopic rod is connected to the strong magnet; the PVC board is also fixed to the wooden base plate and is used to fix the transparent acrylic pipe; the circuit system specifically includes a first circuit composed of two anti-parallel light-emitting diodes and a second circuit composed of a group of light-emitting diodes connected in series; the first switch is used to electrically connect the first circuit to a specific coil segment in the coil, while the second switch is used to selectively electrically connect the second circuit to multiple specific coil segments in the coil.

[0011] Preferably, the telescopic reciprocating motor is fixed to the wooden base plate by an iron bracket and an iron nail; the PVC board is fixed to the wooden base plate by an iron bracket and an iron nail.

[0012] Preferably, the transparent acrylic pipe is fixed to the PVC board by nylon cable ties.

[0013] Preferably, the coil is wound in sections along the length of the transparent acrylic pipe to form coil groups with different numbers of turns.

[0014] In one specific implementation, the coil assembly includes a 400-turn coil segment, an 800-turn coil segment, and a 2400-turn coil segment.

[0015] Furthermore, the first switch is used to connect or disconnect the first circuit from the 400-turn coil segment; the second switch is used to selectively connect the second circuit to one of the 400-turn, 800-turn, or 2400-turn coil segments.

[0016] Preferably, the two LEDs connected in reverse parallel in the first circuit are of different colors to visually indicate the direction of the induced current.

[0017] Preferably, the number of LEDs connected in series in the second circuit is two.

[0018] Preferably, the installation position of the telescopic reciprocating motor is such that the reciprocating motion axis of its telescopic rod coincides with the central axis of the transparent acrylic pipe, so as to ensure the smooth operation of the strong magnet.

[0019] Preferably, the probe further includes a speed controller electrically connected to the telescopic reciprocating motor for precisely controlling the movement speed of the strong magnet.

[0020] This utility model has the following beneficial effects: 1. In this utility model, the demonstration functions of Lenz's law and Faraday's law of electromagnetic induction are integrated into one device, which simplifies teaching preparation and improves classroom teaching efficiency.

[0021] 2. In this utility model, different colored light-emitting diodes are used to display the direction of the induced current, and the different brightness of a group of series-connected light-emitting diodes is used to characterize the magnitude of the induced electromotive force. This transforms the abstract electromagnetic laws into intuitive and clear visual signals, replacing the traditional voltmeter, solving the problems of difficult and unintuitive reading, and enhancing the teaching demonstration effect. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of a dual-loop integrated electromagnetic induction research instrument proposed in this utility model. Figure 2 This is a schematic diagram of the coil assembly and acrylic pipe of a dual-loop integrated electromagnetic induction research instrument proposed in this utility model. Figure 3 This is a schematic diagram of the telescopic reciprocating motor of a dual-loop integrated electromagnetic induction research instrument proposed in this utility model. Figure 4 The present invention provides a dual-loop integrated electromagnetic induction research instrument with a dual-loop circuit diagram.

[0023] Legend: 1. Telescopic reciprocating motor; 2. Iron bracket one; 3. Speed ​​controller; 4. Iron nail one; 5. Wooden base plate; 6. Strong magnet; 7. PVC board; 8. Light-emitting diode; 9. First switch; 10. Transparent acrylic pipe; 11. Nylon cable ties; 12. Conductive copper foil tape; 13. Iron nail two; 14. Iron bracket two; 15. Coil; 16. Second switch. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please refer to Figures 1 to 4 This utility model provides a dual-loop integrated electromagnetic induction research instrument. The research instrument includes a wooden base plate 5 as a basic platform. A telescopic reciprocating motor 1 is fixedly connected to one end of the wooden base plate 5 by an iron bracket 2 and several iron nails 4. A speed regulator 3 is electrically connected to the telescopic reciprocating motor 1 to precisely adjust the reciprocating speed of the telescopic reciprocating motor 1.

[0026] The PVC board 7 is fixedly connected to the wooden base plate 5 by iron bracket 2 14 and several iron nails 2 13. The hollow transparent acrylic pipe 10 is firmly fixed to the surface of the PVC board 7 by multiple nylon cable ties 11. The telescopic reciprocating motor 1 makes the reciprocating motion axis of its telescopic rod coincide with the central axis of the transparent acrylic pipe 10 to ensure that the strong magnet 6 can slide smoothly and without obstruction inside the pipe. The strong magnet 6 is set inside the transparent acrylic pipe 10, and its front end is fixedly connected to the end of the telescopic rod of the telescopic reciprocating motor 1.

[0027] The coil 15 is wound on the outer wall of the transparent acrylic pipe 10. The coil 15 is wound into multiple coil groups with different numbers of turns in sections along the length direction of the transparent acrylic pipe 10. In this embodiment, the coil group specifically includes a coil segment with 400 turns, a coil segment with 800 turns, and a coil segment with 2400 turns. Each coil segment is independent of each other and has its own lead-out end.

[0028] A circuit system is integrated on the surface of PVC board 7. This system consists of conductive copper foil tape 12 forming conductive lines, and several light-emitting diodes 8 and a first switch 9 are soldered onto the circuit. Figure 4 (S in the middle) and a second switch 16 (corresponding to Figure 4 The circuit system specifically includes a first loop (Lenz's law loop) and a second loop (Faraday's law of electromagnetic induction loop), which combines the functions of S1, S2, and S3.

[0029] The first circuit consists of two LEDs of different colors (e.g., green D1 and red D2) connected in reverse parallel. The first switch 9 is used to connect or disconnect the first circuit to a 400-turn coil segment.

[0030] The second circuit consists of a set of light-emitting diodes with a fixed threshold voltage. Figure 2The circuit is connected in series (D3 is shown in the diagram). The second switch 16 is a multi-position selector switch, and its different positions are used to selectively connect the second circuit to one of the coil segments with 400 turns, 800 turns, or 2400 turns.

[0031] Example 1: Demonstration Experiment of Lenz's Law (Direction of Induced Current) Operating steps: Close the first switch 9 (S) to connect the first circuit to the 400-turn coil. Adjust the speed controller 3 to the "medium speed" setting. Start the telescopic reciprocating motor 1 to make the strong magnet 6 reciprocate along the acrylic tube 10. Observe the lighting status of LEDs D1 (green) and D2 (red).

[0032] Experimental results: When the strong magnet 6 enters the coil (magnetic flux increases), the red LED D2 lights up; when the strong magnet 6 leaves the coil (magnetic flux decreases), the green LED D1 lights up. When the strong magnet 6 moves in the opposite direction, the lighting order of D1 and D2 reverses, resulting in alternating flashing.

[0033] Conclusion: The experimental phenomena clearly show that the direction of the induced current changes with the change (increase / decrease) of the magnetic flux, thus clearly verifying Lenz's law.

[0034] Example 2: Demonstration Experiment of Faraday's Law of Electromagnetic Induction 2.1 Relationship between induced electromotive force and rate of change of magnetic flux (velocity) Operating steps: Disconnect the first switch 9. Set the second switch 16 to the position where the 400-turn coil is connected (corresponding to closing S2). First, adjust the speed controller 3 to "low speed", start the motor, and observe the lighting status of the second circuit LED D3; then adjust the speed to "medium speed" and "high speed" in turn, and observe the lighting status of D3 respectively.

[0035] Experimental results: At low speeds, D3 emits no light or only a faint light; at medium speeds, D3 emits a faint light; at high speeds, D3 emits a bright light.

[0036] Conclusion: When the number of coil turns is constant, the faster the strong magnet moves (i.e. the greater the rate of change of magnetic flux), the greater the induced electromotive force, verifying that E∝ΔΦ / Δt.

[0037] 2.2 Relationship between induced electromotive force and the number of coil turns Operating steps: Keep speed controller 3 in the "medium speed" position. First, switch the second switch 16 to the position where the 400-turn coil is connected (corresponding to closing S1), and observe the light status of D3; then switch to the positions where the 800-turn coil (S2) and 2400-turn coil (S3) are connected in turn, and observe the light status of D3 respectively.

[0038] Experimental results: When connected to a 400-turn coil, D3 emits light with weak brightness; when connected to an 800-turn coil, D3 emits light with moderate brightness; when connected to a 2400-turn coil, D3 emits light with significantly enhanced brightness.

[0039] Conclusion: When the rate of change of magnetic flux is constant, the more turns of the coil, the greater the induced electromotive force, which verifies E∝n.

[0040] Experimental Data Recording and Analysis To facilitate students in summarizing conclusions, experimental records can be kept in tabular form, as shown below: Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A dual-loop integrated electromagnetic induction research instrument, comprising: The wooden base plate (5), the transparent acrylic tube (10) with a coil (15) wound around it, and the strong magnet (6) disposed within the transparent acrylic tube (10) are characterized in that they further include: A telescopic reciprocating motor (1) is fixed on the wooden base plate (5), and the telescopic rod of the telescopic reciprocating motor (1) is connected to the strong magnet (6); A PVC board (7) is fixed on the wooden base plate (5). A transparent acrylic pipe (10) is fixed on the PVC board (7). A light-emitting diode (8), a first switch (9), a second switch (16), and a circuit composed of conductive copper foil tape (12) are also arranged on the PVC board (7). The circuit includes a first circuit composed of two light-emitting diodes (8) connected in reverse parallel, and a second circuit composed of multiple sets of light-emitting diodes (8) connected in series. The first switch (9) is electrically connected to a specific coil segment in the first circuit and the coil (15), and the second switch (16) is electrically connected to multiple specific coil segments in the second circuit and the coil (15).

2. The dual-loop integrated electromagnetic induction research instrument according to claim 1, characterized in that, The telescopic reciprocating motor (1) is fixed to the wooden base plate (5) by iron bracket one (2) and iron nail one (4); the PVC board (7) is fixed to the wooden base plate (5) by iron bracket two (14) and iron nail two (13).

3. The dual-loop integrated electromagnetic induction research instrument according to claim 1, characterized in that, The transparent acrylic pipe (10) is fixed to the PVC plate (7) by nylon cable ties (11).

4. The dual-loop integrated electromagnetic induction research instrument according to claim 1, characterized in that, The coil (15) is wound in sections along the length of the transparent acrylic tube (10) into coil groups with different numbers of turns.

5. The dual-loop integrated electromagnetic induction research instrument according to claim 4, characterized in that, The coil assembly includes a 400-turn coil segment, an 800-turn coil segment, and a 2400-turn coil segment.

6. The dual-loop integrated electromagnetic induction research instrument according to claim 5, characterized in that, The first switch (9) is used to connect or disconnect the first circuit from the 400-turn coil segment; the second switch (16) is used to selectively connect the second circuit to one of the 400-turn, 800-turn, or 2400-turn coil segments.

7. The dual-loop integrated electromagnetic induction research instrument according to claim 1, characterized in that, The two LEDs (8) connected in reverse parallel in the first circuit are different colors.

8. The dual-loop integrated electromagnetic induction research instrument according to claim 1, characterized in that, The number of LEDs (8) connected in series in the second circuit is two.

9. The dual-loop integrated electromagnetic induction research instrument according to claim 1, characterized in that, The telescopic reciprocating motor (1) is installed in a position such that the reciprocating axis of its telescopic rod coincides with the central axis of the transparent acrylic pipe (10).

10. The dual-loop integrated electromagnetic induction research instrument according to claim 1, characterized in that, It also includes a speed controller (3) electrically connected to the telescopic reciprocating motor (1) for adjusting the speed of the telescopic reciprocating motor (1).

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