Demonstration device of Janibekov's theorem in non-weightless state

Abstract

The present invention relates to a demonstration device of Janibekov's theorem in a non-weightless state, and the structure thereof includes a base, a suspension balancer, a suspension ball and a system controller. The present invention can make the suspension ball produce a stable magnetic suspension state through the cooperation of the suspension balancer and the system controller. The unique three-axis structure of the suspension ball can produce three different object moments of inertia of large, medium and small, and can realize the demonstration and observation of Janibekov's theorem in a non-weightless state. The present invention uses magnetic suspension technology to produce a local "weightless" environment, and is equipped with a suspension ball with a unique three-axis structure to form a demonstration device that has both suspension ability and can demonstrate Janibekov's theorem. The use of the demonstration device of the present invention makes it possible to directly observe and demonstrate the Janibekov's theorem, which is usually difficult to observe and demonstrate, in a natural gravity environment on the ground for a long time and in an interactive manner, making it easier to understand and accept, thereby achieving a popular science effect that is difficult to achieve with general video descriptions and explanations.

Description

Technical Field

[0001] The invention relates to a physics theorem demonstration device, in particular to a Janibekov theorem demonstration device in a non-weightlessness state. Background Art

[0002] As is known to all, any rigid object has three mutually perpendicular principal axes in a spatial rectangular coordinate system, namely, the X-axis, the Y-axis, and the Z-axis, which are referred to as the first principal axis, the second principal axis, and the third principal axis in the present invention. Moreover, except for a homogeneous round sphere and a regular cube, the moment of inertia around each principal axis is different. Therefore, the moment of inertia of the rigid object on the three principal axes is divided into large, medium, and small, and is reflected in the three principal axes in turn.

[0003] When an object is not subjected to an external torque, it follows the following law when rotating: it is stable when rotating around the main axis with the largest moment of inertia (the first main axis) or the main axis with the smallest moment of inertia (the third main axis), but it is unstable when rotating around the intermediate axis (the second main axis). Therefore, when an object rotates around the second main axis, it will flip rapidly. This is the basic content of the Janibekov theorem (also known as the tennis racket theorem).

[0004] In fact, such experiments can be performed using any rigid object with three main axes with different moments of inertia, and the flipping effect produced by the Janibekov principle can be manifested only by rotating the object around its second main axis, regardless of the air resistance or gravity of the experimental environment. However, in general, the physical phenomena involved in this experiment can only be clearly demonstrated and observed for a long time in a weightless environment similar to a space laboratory. This is because under the gravity of the earth, the demonstration object must be in a free fall state. On the one hand, the Janibekov effect flipping of the demonstration object itself and the fall of the demonstration object itself are mixed together and difficult to distinguish; on the other hand, the demonstration ends when the demonstration object lands on the ground, which makes the observer's observation time very short. Therefore, it is difficult for the observer to carefully observe the occurrence of the Janibekov effect flipping for a long time.

[0005] CN201921055633 provides a weightlessness environment simulation device, which generates an output signal from a control power supply. The output signal reaches the ultrasonic transmitting end after passing through a power amplifier, causing the piezoelectric ceramic at the transmitting end to vibrate and generate ultrasonic waves. After the ultrasonic wave reaches the reflecting end, its transmission direction is reversed, and the ultrasonic wave after reflection is superimposed with the ultrasonic wave before reflection to form a standing wave. The ultrasonic wave frequency is controlled near the natural frequency of the device to achieve the maximum power of sound wave output, and then the suspension of tiny objects such as dust particles can be achieved. However, the weightlessness simulation environment for tiny particles provided by the patent is not enough to demonstrate the Janibekov theorem, because the suspension support force it provides is far from enough.

[0006] CN2665841Y discloses a high-power weightlessness simulation simulator. The weightlessness simulation simulator generates an upward airflow of 0 to 180 kilometers per hour in a vertical air duct to generate sufficient buoyancy to overcome the human body's gravity, so that the human body can float in the air and experience the feeling of weightlessness. However, it is obviously not an easy task to use high-speed airflow to blow a rigid object into the air and make it float stably according to this method. Summary of the invention

[0007] One of the purposes of the present invention is to provide a device for demonstrating Janibekov's theorem in a non-weightless state, so as to solve the problem that the traditional Janibekov's theorem demonstration needs to be well demonstrated under weightless conditions.

[0008] The object of the present invention is achieved in that:

[0009] A device for demonstrating the Janibekov theorem in a non-weightless state, comprising:

[0010] A base, used for supporting and connecting a suspension balancer;

[0011] The suspension balancer is a disk body, which is supported and connected above the base by an arc-shaped bracket; a main magnet for adsorbing the suspension ball is arranged at the center of the bottom surface of the disk body, a vertical control coil for adjusting the suspension height of the suspension ball is wound on the main magnet, a plurality of auxiliary magnets distributed in a circular state are arranged in a centrally symmetrical form around the main magnet, a horizontal control coil for adjusting the horizontal position of the suspension ball is wound on each auxiliary magnet, a plurality of position sensors for detecting the position of the suspension ball are distributed in a centrally symmetrical form on the edge of the disk body, and all the position sensors form a sensor group; the vertical control coil, the horizontal control coil and the position sensor are all electrically connected to the system controller;

[0012] A suspension ball comprises a spherical shell made of a magnetic conductive material and three through shafts of different diameters arranged in the spherical shell and made of a non-magnetic conductive material, wherein the axis lines of the three through shafts intersect each other perpendicularly, and the intersection point thereof is located at the center of the spherical shell, the ends of the three through shafts are attached to the inner wall of the spherical shell, and the two ends of the three through shafts are respectively connected with outwardly extending turning handles along the axis lines, and the turning handles pass through the spherical shell; and

[0013] The system controller includes a control unit and a plurality of power drive circuits; the control unit is a single chip microcomputer, which is used to receive the suspended ball position detection data sent by the position sensor in real time, calculate the power-on rule or state of the vertical control coil and the horizontal control coil, and send corresponding adjustment control signals to each power drive circuit; there are a plurality of power drive circuits, and the vertical control coil and each horizontal control coil are respectively connected to a power drive circuit; the power drive circuit is used to amplify the power of the adjustment control signal sent by the control unit to adjust the size and direction of the current in the connected vertical control coil or horizontal control coil, so that the suspended ball can be stably suspended directly below the suspension balancer.

[0014] Furthermore, the rotating handles on the three through-axes in the suspension ball are distinguished by different external colors, and the rotating handles on the same through-axle have the same color.

[0015] The present invention utilizes the main magnet on the suspension balancer and a plurality of auxiliary magnets surrounding the main magnet to form a suspension magnetic field, so as to provide an attraction force that is equal to the weight of the suspension ball and opposite in direction within a certain distance, thereby forming a balanced position. Through this magnetic attraction, the weight of the suspension ball is balanced, so that the suspension ball can be suspended in the space between the suspension balancer and the base. At the same time, the suspension ball can also rotate freely along any axis in the suspension state. The position detector on the suspension balancer performs three-dimensional detection of the position of the suspension ball in the suspension state, so as to detect the position and suspension height of the suspension ball relative to the suspension balancer and the stable state of the suspension ball. The vertical control coil is coaxial with the main magnet to adjust the suspension height of the suspension ball. The horizontal control coil is evenly and symmetrically distributed around the main magnet, and can control the horizontal displacement of the suspension ball. The vertical control coil and the horizontal control coil are both adjusted by the system controller to adjust the direction and size of the current flowing through them, so as to synthesize a comprehensive adjustment magnetic field, and precisely adjust the relative position between the suspension ball and the suspension balancer, thereby ensuring the stable suspension of the suspension ball.

[0016] The present invention can make the suspension ball generate a stable magnetic suspension state in the space between the base and the suspension balancer through the cooperation of the suspension balancer and the system controller. Through the three non-magnetic flux axes with different diameters and perpendicular to each other in the suspension ball, three different object rotational inertias of large, medium and small can be generated, and the suspension ball can be rotated around the axis by manipulating the handles at both ends of different through-axes on the suspension ball, thereby realizing the demonstration and observation of Janibekov's theorem in a non-weightless state, that is, when the suspension ball is in a static suspension state, manual dialing or twisting of different rotation axes can make it obtain initial rotational power, thereby generating stable rotation. Through the state of the suspension ball rotating around different rotation axes, the 180° rotation phenomenon of the rotation axis caused by Janibekov's theorem can be clearly compared and observed.

[0017] The present invention can also be implemented like this:

[0018] A device for demonstrating the Janibekov theorem in a non-weightless state, comprising:

[0019] A base, used for supporting and connecting a suspension balancer;

[0020] The suspension balancer is a disk body, which is supported and connected above the base by an arc-shaped bracket; a main magnet for adsorbing the suspension ball is arranged at the center of the bottom surface of the disk body, a vertical control coil for adjusting the suspension height of the suspension ball is wound on the main magnet, a plurality of auxiliary magnets distributed in a circular state are arranged in a centrally symmetrical form around the main magnet, a horizontal control coil for adjusting the horizontal position of the suspension ball is wound on each auxiliary magnet, a plurality of position sensors for detecting the position of the suspension ball are distributed in a centrally symmetrical form on the edge of the disk body, and all the position sensors form a sensor group; the vertical control coil, the horizontal control coil and the position sensor are all electrically connected to the system controller;

[0021] A suspension ball comprises a spherical shell made of a magnetic conductive material and a spherical core arranged in the spherical shell and made of a non-magnetic conductive material, wherein the spherical surface of the spherical core is attached to the inner surface of the spherical shell; the spherical core is provided with three cylindrical through holes, the inner diameters of the three through holes are different from each other, and the axis lines of the through holes intersect each other perpendicularly, and the intersection point of the axis lines is located at the center of the spherical core; and

[0022] The system controller includes a control unit and a plurality of power drive circuits; the control unit is a single chip microcomputer, which is used to receive the suspended ball position detection data sent by the position sensor in real time, calculate the power-on rule or state of the vertical control coil and the horizontal control coil, and send corresponding adjustment control signals to each power drive circuit; there are a plurality of power drive circuits, and the vertical control coil and each horizontal control coil are respectively connected to a power drive circuit; the power drive circuit is used to amplify the power of the adjustment control signal sent by the control unit to adjust the size and direction of the current in the connected vertical control coil or horizontal control coil, so that the suspended ball can be stably suspended directly below the suspension balancer.

[0023] Furthermore, rotating handles extending outwards are respectively connected to the axial center lines of the three through holes on the spherical shell relative to the spherical inner core.

[0024] Furthermore, the turning handles arranged on different axial lines of the through holes are distinguished by different external colors, and the two turning handles on the same axial line of the through hole have the same color.

[0025] The present invention uses magnetic levitation technology to create a local "weightless" environment, and with a unique three-axis structure of the suspension ball, a demonstration device is formed that has both suspension capabilities and can demonstrate the Janibekov theorem. The use of the demonstration device of the present invention makes it possible to directly demonstrate and observe the Janibekov theorem, which is usually difficult to observe and demonstrate, in an interactive way for a long time in the natural gravity environment on the ground, making the Janibekov theorem easier to understand and accept, thereby achieving a popular science effect that is difficult to achieve with general video descriptions and explanations. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the demonstration device of the present invention.

[0027] Figure 2 It is a schematic diagram of the structure when the bottom surface of the suspension balancer is flipped upward.

[0028] Figure 3 It is a schematic diagram of the structure of the suspended ball.

[0029] Figure 4 It is a schematic diagram of the structure of the three-way shaft inside the suspension ball.

[0030] Figure 5 It is a structural diagram of the second implementation method of the suspended ball.

[0031] Figure 6 It is a schematic diagram of the structure of the spherical core in the suspended sphere.

[0032] Figure 7 It is the structural block diagram of the system controller.

[0033] In the figure: 1. suspension balancer, 2. base, 3. suspension ball, 4. handle, 5. arc bracket, 6. main suction magnet, 7. vertical control coil, 8. position sensor, 9. auxiliary magnet, 10. horizontal control coil, 11. first main axis, 12. second main axis, 13. third main axis, 14. spherical shell, 15. first hollow axis, 16. second hollow axis, 17. third hollow axis, 18. spherical core. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0035] Example 1

[0036] like Figure 1 As shown, the demonstration device of the present invention includes a suspension balancer 1, a base 2, a suspension ball 3 and a system controller ( Figure 7 ) and other parts. The base 2 is in the shape of a truncated cone, and the system controller is built in it. The arc bracket 5 is a bent handle rod, the lower end of which is fixedly connected to the side edge of the base 2, and the upper end of which is fixedly connected to the side edge of the suspension balancer 1, so that the suspension balancer 1 and the base 2 are opposite to each other up and down.

[0037] like Figure 1 , Figure 2 As shown, the suspension balancer 1 is a disk body, and a main magnet 6 is arranged at the center of the bottom surface of the disk body. The main magnet 6 is made of a magnetic steel material with strong magnetism. A vertical control coil 7 is wound on the main magnet 6, and six auxiliary magnets 9 are arranged around the main magnet 6 in a centrally symmetrical form. The auxiliary magnets 9 are made of a magnetic steel material with strong magnetism. The auxiliary magnets 9 are distributed in a circular state, and a horizontal control coil 10 is wound around each auxiliary magnet 9. The horizontal control coils 10 are also distributed in a centrally symmetrical form. Six position sensors 8 (the number may be increased or decreased) are distributed in a centrally symmetrical form near the edge of the bottom surface of the disk body, and all the position sensors form a sensor group. The vertical control coil 7, the horizontal control coil 10 and each position sensor 8 are electrically connected to the system controller installed in the base 2.

[0038] The main magnet 6 is arranged at the center of the bottom surface of the suspension balancer 1, and plays the main role of magnetic attraction and suspension for the suspension ball 3. The auxiliary magnet 9 arranged around the main magnet 6 mainly strengthens the magnetic force of the main magnet. By increasing or decreasing the number of auxiliary magnets, the basic magnetic field strength of the suspension balancer 1 can be changed, so that the suspension balancer can be applied to suspension balls 3 of different materials and different weights, so as to better demonstrate and compare the flipping phenomenon of various types of suspension balls. The vertical control coil 7 wound on the main magnet 6 can adjust the suspension height of the suspension ball 3. The horizontal control coil 10 wound on each auxiliary magnet 9 belongs to the horizontal magnetic adjustment coil, and its function is to adjust the horizontal position of the suspension ball 3. All position data of the suspension ball 3 are detected by a sensor group composed of six position sensors 8, and provided to the system controller, and the adjustment signal is calculated by the single chip microcomputer in the system controller, and then the corresponding power amplifier circuit drives the electrically connected vertical control coil or horizontal control coil to form a driving force to return the suspension ball 3 to its position.

[0039] like Figure 3 , Figure 4 As shown, the suspension ball 3 includes a spherical shell 14 ( Figure 3 The spherical shell 3 in the figure is partially cut away) and three through shafts with different diameters are arranged in the spherical shell, wherein the thickest through shaft is the first main shaft 11, the thinnest through shaft is the third main shaft 13, and the middle through shaft is the second main shaft 12. The axis lines of the three through shafts intersect each other perpendicularly ( Figure 4 ), whose intersection is located at the center of the spherical shell 14, so that the geometric center of the suspended ball and the center of gravity completely coincide. The ends of the three through shafts are attached to the inner wall of the spherical shell 14. Figure 4 In the embodiment, the two ends of the three through shafts are connected with the handles 4 extending outwards along the axis respectively, and the handles 4 pass through the spherical shell 14 to form a manual operating handle for rotating the suspension ball. For the sake of conspicuousness, the handles 4 on the three through shafts in the suspension ball 3 are distinguished by different external colors, and the handles on the same through shaft have the same color. In this embodiment, the handle 4 on the first main shaft 11 is marked red, the handle 4 on the second main shaft 12 is marked green, and the handle 4 on the third main shaft 13 is marked blue.

[0040] The spherical shell 14 is a perfect circular spherical shell structure, and is made of soft magnetic material. The soft magnetic spherical shell 14 can be controlled by the magnetic field of the suspension balancer 1, and can be attracted by the magnetic field, but will not be magnetized by the magnetic field, so that the electromagnetic characteristics of the suspension ball 3 can remain the same. The three through shafts in the suspension ball are made of non-magnetic materials, which will not have any effect on the overall magnetic circuit of the suspension ball, but its characteristics are obvious diameter difference and orthogonal penetration between the two to form a three-dimensional structure that can meet the Janibekov theorem, which is installed in the spherical shell 14, so that the suspension ball has both the ability to suspend and the characteristics of the Janibekov theorem.

[0041] The electromagnetic characteristics of the suspended ball 3 in any posture in the suspended space of the demonstration device of the present invention are constant, and its internal torque is also balanced. In the suspended state without being affected by other external forces, it can remain stationary or rotate at a constant speed.

[0042] like Figure 7 As shown, the system controller includes a control unit and several power drive circuits. The control unit uses a single chip microcomputer to receive the suspended ball position detection data sent by the sensor group in real time. Since the suspended ball 3 is a spherical structure, the distances between different positions on its surface and the bottom surface of the suspended balancer 1 are mostly different. Moreover, there are six rotating handles 4 in the rotating state, which will cause certain interference to the measurement of the overall height of the suspended ball. Therefore, the suspension height of the entire sphere cannot be determined only according to the position of a certain point on the spherical surface of the suspended ball. Instead, it is necessary to use the detection of multiple position sensors 8 to obtain the measurement results of different positions. After eliminating various interference values, the data of the suspension height of the suspended ball is obtained by comprehensive calculation; then, the power-on law or state of the vertical control coil 7 and the horizontal control coil 10 is solved according to the data, and an adjustment control signal is sent to the corresponding power drive circuit. The number of power drive circuits is the sum of the number of vertical control coils 7 and horizontal control coils 10. Among them, one power drive circuit is electrically connected to the vertical control coil 7, and each of the remaining power drive circuits is electrically connected to a horizontal control coil 10. The power driving circuit is used to amplify the power of the adjustment control signal sent by the control unit to adjust the magnitude and direction of the current in the connected vertical control coil 7 or horizontal control coil 10, so that the suspension ball 3 is stably suspended directly below the suspension balancer 1.

[0043] Figure 1 In the figure, the suspended ball 3 can be rotated by manually rubbing or turning one of the handles 4 in the suspended state. When the suspended ball 3 rotates around one of the three through axes, the effect of the Janibekov theorem can be clearly observed. That is, when the suspended ball 3 rotates around the red handle (the first main axis 11), the moment of inertia of the system is the smallest, and the suspended ball 3 rotates smoothly. When the suspended ball rotates around the blue handle (the third main axis 13), the moment of inertia of the system is the largest, and the suspended ball 3 also rotates smoothly. When the suspended ball 3 rotates around the green handle (the second main axis 12), the moment of inertia of the suspended ball 3 is between the maximum and the minimum, so it is in an unstable state of rotation axis. At this time, it can be clearly seen that the suspended ball 3 has been repeatedly flipping. That is, the direction of the second main axis 12 corresponding to the green handle will continuously flip 180°, and the Janibekov theorem is clearly verified and demonstrated.

[0044] In the demonstration device of the present invention, the suspension balancer 1 is actually an electromagnetic plane array. The main magnet 6 arranged in the center and the auxiliary magnets 9 arranged at the periphery together provide a magnetic attraction force that is equal to the weight of the suspension ball at a certain distance and opposite in direction, so that the suspension ball forms a position balance. However, this is an unstable balance point. After the single-chip microcomputer in the system controller detects that the suspension height of the suspension ball deviates from the set value through the sensor group, it is necessary to use PID or similar algorithms to form a correction signal, and then apply a vertical (longitudinal) electromagnetic force through the power drive circuit and the electrically connected vertical control coil 7 to dynamically adjust the suspension ball so that the suspension ball can stably maintain a suspended state at a fixed height.

[0045] Although the suspension ball 3 can be automatically centered in static suspension due to its own gravity, any slight fluctuation may cause the suspension ball to oscillate in the horizontal direction when it is rotating. If the amplitude of the oscillation is large enough, the suspension ball will inevitably fall. In particular, when the suspension ball is manually driven to rotate, while applying the rotational torque, a lateral push-pull or swinging torque will inevitably be introduced, which will cause a relatively serious interference to the rotation state of the suspension ball. For this reason, a horizontal control coil 10 is set on each auxiliary magnet 9 to adjust the position of the suspension ball in two dimensions in the horizontal direction. In this way, the cooperation of the horizontal control coil 10 and the vertical control coil 7 forms a three-dimensional magnetic adjustment environment, so that the suspension ball 3 can also maintain the stability of the suspension position when it is rotating.

[0046] Example 2

[0047] The structure and principle of this embodiment are basically the same as those of the demonstration device of Embodiment 1, except that the structure of the suspension ball 3 is different.

[0048] like Figure 5 As shown, the suspension ball 3 is a spherical shell 14 made of magnetic material (the spherical shell 14 in the figure is partially cut away) provided with a spherical core 18 made of non-magnetic material, and the spherical surface of the spherical core 18 is attached to the inner surface of the spherical shell 14. Figure 6 As shown, three cylindrical through holes are formed on the spherical inner core 18, the inner diameters of the three through holes are different from each other, and the axis lines of the through holes intersect each other perpendicularly, and the intersection of the axis lines is located at the center of the spherical inner core. Thus, a suspended ball with a hollow structure inside is formed, that is, the three through axes in Example 1 are changed into three hollow axis structures here, wherein the first hollow axis 15 corresponds to the first main axis 11 in Example 1, the second hollow axis 16 corresponds to the second main axis 12 in Example 1, and the third hollow axis 17 corresponds to the third main axis 13 in Example 1.

[0049] At the positions of the axis lines of the three through holes on the spherical shell 14 relative to the spherical core 18, the positions of the three hollow axes can be indicated by marking dots of different colors to demonstrate the rotation state and flipping change of the suspended ball 3. As in the present embodiment, the axis lines of the three through holes on the spherical shell 14 relative to the spherical core 18 are respectively connected with the rotating handles 4 extending outward. The rotating handles 4 arranged on the axis lines of different through holes can be distinguished by different external colors, and the two rotating handles on the axis line of the same through hole have the same color.

[0050] The rotation state and operation effect of this suspension ball in the demonstration device are basically the same as the demonstration effect of Example 1. The difference is that the moment of inertia of the suspension ball 3 in this embodiment is exactly opposite to that of the suspension ball formed by the solid main shaft in Example 1, that is, when the suspension ball 3 rotates around the thickest first hollow axis 15, the moment of inertia of the system is the largest; when it rotates around the thinnest third hollow axis 17, the moment of inertia of the system is the smallest; when the suspension ball 3 rotates around the central second hollow axis 16, a 180° flipping phenomenon will occur repeatedly.

Claims

1. A device for demonstrating Janibekov's theorem in a non-weightless state, characterized in that: include: A base, used for supporting and connecting a suspension balancer; The suspension balancer is a disc body, which is supported and connected above the base by an arc-shaped bracket; A main magnet for adsorbing the suspended ball is arranged at the center of the bottom surface of the disk body, a vertical control coil for adjusting the suspension height of the suspended ball is wound around the main magnet, a plurality of auxiliary magnets distributed in a circular state are arranged in a centrally symmetrical form around the main magnet, a horizontal control coil for adjusting the horizontal position of the suspended ball is wound around each auxiliary magnet, and a plurality of position sensors for detecting the position of the suspended ball are distributed in a centrally symmetrical form on the edge of the disk body; the vertical control coil, the horizontal control coil and the position sensor are all electrically connected to the system controller; The suspension ball comprises a spherical shell made of a magnetic conductive material and three through shafts with different diameters arranged in the spherical shell and made of a non-magnetic conductive material. The axis lines of the three through shafts intersect each other perpendicularly, and the intersection point is located at the center of the spherical shell. The ends of the three through shafts are attached to the inner wall of the spherical shell. The two ends of the three through shafts are respectively connected to the outwardly extending rotating handles along the axis lines, and the rotating handles pass through the spherical shell. as well as The system controller includes a control unit and a plurality of power drive circuits; the control unit is a single chip microcomputer, which is used to receive the suspended ball position detection data sent by the position sensor in real time, calculate the power-on rule or state of the vertical control coil and the horizontal control coil, and send corresponding adjustment control signals to each power drive circuit; there are a plurality of power drive circuits, and the vertical control coil and each horizontal control coil are respectively connected to a power drive circuit; the power drive circuit is used to amplify the power of the adjustment control signal sent by the control unit to adjust the size and direction of the current in the connected vertical control coil or horizontal control coil, so that the suspended ball can be stably suspended directly below the suspension balancer.

2. The device for demonstrating the Janibekov theorem in a non-weightless state according to claim 1, characterized in that: The handles on the three through-axles are distinguished by different external coloring, and the handles on the same through-axle have the same color.

3. A device for demonstrating Janibekov's theorem in a non-weightless state, characterized in that: include: A base, used for supporting and connecting a suspension balancer; The suspension balancer is a disc body, which is supported and connected above the base by an arc-shaped bracket; A main magnet for adsorbing the suspended ball is arranged at the center of the bottom surface of the disk body, a vertical control coil for adjusting the suspension height of the suspended ball is wound around the main magnet, a plurality of auxiliary magnets distributed in a circular state are arranged in a centrally symmetrical form around the main magnet, a horizontal control coil for adjusting the horizontal position of the suspended ball is wound around each auxiliary magnet, and a plurality of position sensors for detecting the position of the suspended ball are distributed in a centrally symmetrical form on the edge of the disk body; the vertical control coil, the horizontal control coil and the position sensor are all electrically connected to the system controller; The suspension ball comprises a spherical shell made of a magnetic conductive material and a spherical core arranged in the spherical shell and made of a non-magnetic conductive material, wherein the spherical surface of the spherical core is attached to the inner surface of the spherical shell; the spherical core is provided with three cylindrical through holes, the inner diameters of the three through holes are different from each other, and the axis lines of the through holes intersect each other perpendicularly, and the intersection point of the axis lines is located at the center of the spherical core; as well as The system controller includes a control unit and a plurality of power drive circuits; the control unit is a single chip microcomputer, which is used to receive the suspended ball position detection data sent by the position sensor in real time, calculate the power-on rule or state of the vertical control coil and the horizontal control coil, and send corresponding adjustment control signals to each power drive circuit; there are a plurality of power drive circuits, and the vertical control coil and each horizontal control coil are respectively connected to a power drive circuit; the power drive circuit is used to amplify the power of the adjustment control signal sent by the control unit to adjust the size and direction of the current in the connected vertical control coil or horizontal control coil, so that the suspended ball can be stably suspended directly below the suspension balancer.

4. The device for demonstrating the Janibekov theorem in a non-weightless state according to claim 3, characterized in that: Rotating handles extending outwards are respectively connected on the axis lines of the three through holes on the spherical shell body relative to the spherical inner core.

5. The device for demonstrating the Janibekov theorem in a non-weightless state according to claim 4, characterized in that: The turning handles arranged on different through-hole axis lines are distinguished by different external colors, and the two turning handles on the same through-hole axis line have the same color.

Images