Magnetic levitation demonstration system showing horizontal rotation axis

Abstract

The present invention relates to a magnetic levitation demonstration system for displaying a horizontal rotating shaft state, the structure of which includes a stator and a float; the stator includes a base plate, a left bracket and a right bracket arranged on the base plate, a float traction coil arranged on the left bracket, a positioning coil group and a position sensor arranged on the right bracket, a rotation drive coil group arranged in the middle of the base plate, and left and right end lifting magnets arranged on the base plate; the float includes a horizontal shaft, a rotating magnet group connected to the middle of the shaft, and left and right end suspension magnets arranged at the ends of the shaft. The magnetic levitation demonstration system of the present invention can display the float in the state of a horizontal rotating shaft. The float can not only stably levitate but also rotate in a controlled manner. Its start and stop functions are guaranteed by its own suspension structure and electrical links. There is no mechanical motion support structure, which can significantly reduce the failure rate of automatic suspension operation and demonstration.

Description

Technical Field

[0001] The invention relates to a physics teaching tool, in particular to a magnetic suspension demonstration system for displaying a horizontal rotating shaft state. Background Art

[0002] Magnetic levitation systems utilize magnetic force to suspend objects without mechanical contact, and related products have a wide range of applications. Currently, they are more commonly found in various fields such as education, science popularization, and entertainment. Most of these systems feature a vertical axial float structure. However, some horizontal axial magnetic levitation systems require mechanical support in one axial dimension, rendering them incomplete magnetic levitation mechanisms and hindering their proper understanding and grasp of the concept. Furthermore, most systems require manual placement of the float during startup, a task that requires experience and practice to understand the magnetic field patterns. This can be challenging for first-time users.

[0003] Patent No. CN204261350U, based on the structure of the Mendocino motor, discloses a toy and science device with a float that can rotate horizontally, offering greater visual appeal than static magnetic levitation. This structure requires mechanical support of one end of the float on a support plate to limit its axial freedom of movement. Strictly speaking, this float, which only produces a "semi-levitation" effect according to the aforementioned definition, cannot achieve a full six-degree-of-freedom magnetic levitation state. Patent No. CN2569440Y discloses a method for electromagnetically providing horizontal axial levitation support, aiming to address the aforementioned issue of incomplete magnetic levitation. However, in the device used in this method, the axial direction of the magnetic coil does not coincide with the axial direction of the float, and the electromagnetic effect provided only strengthens or weakens the inherent magnetic field direction of the permanent magnet. Specifically, at the controlled end of the horizontal float, this affects radial displacement more than axial displacement, making it difficult to provide stable levitation control. Patent No. CN111726038A discloses a method for automatic centering and position lifting of a float, but its mechanical movement mechanism is relatively complex and failures are inevitable during long-term operation demonstration. Summary of the Invention

[0004] The purpose of the present invention is to provide a magnetic levitation demonstration system for displaying a horizontal rotating shaft state, so as to solve the problem that the existing magnetic levitation demonstration device requires manual initial positioning and suspension of the float, and realize the controlled rotation of the float.

[0005] The present invention is achieved in that:

[0006] A magnetic levitation demonstration system for displaying a horizontal rotating shaft state, comprising a stator and a float;

[0007] The stator includes a bottom plate, a left bracket and a right bracket arranged on the bottom plate, a float traction coil arranged on the left bracket, a positioning coil group and a position sensor arranged on the right bracket, a rotation drive coil group arranged in the middle of the bottom plate, and a left end lifting magnet and a right end lifting magnet arranged on the bottom plate;

[0008] The float comprises a horizontal shaft, a rotating magnet group passing through the middle of the shaft, and a left-end suspension magnet and a right-end suspension magnet arranged at the ends of the shaft.

[0009] The left-end levitation magnet is opposite to the left-end lifting magnet in vertical direction, and the right-end levitation magnet is opposite to the right-end lifting magnet in vertical direction, so as to generate a magnetic repulsive force to lift the float; the magnets in the rotating magnet group correspond one-to-one to the coils in the rotating drive coil group and are opposite to each other in vertical direction, so as to generate a driving force to rotate the float.

[0010] Furthermore, the left-end lifting magnet and the right-end lifting magnet are both composed of two cylindrical magnets arranged side by side and spaced apart; both cylindrical magnets are axially magnetized and have the same magnetization direction to form a stable and uniform lifting magnetic field in the middle of the two.

[0011] Furthermore, the left-end suspension magnet is a cylindrical magnet, axially magnetized, and has the same magnetization direction as the magnet pair in the left-end lifting magnet; the right-end suspension magnet is a cylindrical magnet, axially magnetized, and has the same magnetization direction as the magnet pair in the right-end lifting magnet.

[0012] Furthermore, the positioning coil group includes four coils with the same physical structure and electrical parameters. The four coils are distributed in the four directions of up, down, left and right of the position sensor. The four coils are divided into one group of up and down and one group of left and right. The two coils in each group are connected in series or in parallel, and the directions of the currents are opposite.

[0013] Furthermore, the position sensor is at the same distance from the four coils in the positioning coil group, and its height protruding from the support plate surface is half of the height of the coil.

[0014] Furthermore, the rotating magnet group includes at least three annular permanent magnets, which are radially magnetized and fixed on the shaft at equal intervals; the magnetic field directions of each permanent magnet are distributed at equal angles on the radial circumference of the shaft, that is, each permanent magnet divides the angle of the float's circumferential angle equally in the order of its respective magnetic pole directions.

[0015] Furthermore, the rotation drive coil group includes coils having the same number as the permanent magnets in the rotation magnet group, and all coils are arranged in a line on the bottom plate along the length direction, with one coil and one permanent magnet positioned opposite to each other in the upper and lower directions.

[0016] Furthermore, the spacing between the left-end levitation magnet and the right-end levitation magnet is not equal to the spacing between the left-end lifting magnet and the right-end lifting magnet.

[0017] Furthermore, the coils in the rotation drive coil assembly are linearly arranged along the axial direction of the float.

[0018] Furthermore, the permanent magnets in the rotating magnet group are installed in a spiral manner according to the direction of their magnetic poles.

[0019] The present invention is electrically composed of two independent basic structures: a suspension mechanism and a rotation mechanism. The suspension mechanism utilizes two independent, spaced-apart magnetic suspension nodes, which jointly support a horizontally axially arranged float that provides levitation. Axially magnetized cylindrical suspension magnets are located at each end of the float, supporting the stator's support magnets to achieve stable levitation. The float can freely rotate around the shaft, creating a controlled levitation and rotational educational demonstration device that combines magnetic suspension technology with stepper and synchronous motor control technologies. The device can also be used as a desktop ornament.

[0020] The present invention provides a magnetic levitation demonstration mechanism in which a float can exhibit a horizontal rotation state. The float in the system can not only be stably suspended but also rotated in a controlled manner. In particular, the start and stop functions of the float are guaranteed by its own suspension structure and electrical links. There is no mechanical motion support structure, and manual operation of the float's initial positioning and initial suspension is not required. In addition, the failure rate of automatic suspension operation and demonstration can be greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the magnetic levitation demonstration system of the present invention.

[0022] Figure 2 This is a schematic diagram of the installation position of the float traction coil.

[0023] Figure 3 It is a schematic diagram of the arrangement of the positioning coil group and the position sensor.

[0024] Figure 4 It is the diagram of the magnet suspension relationship on the left.

[0025] Figure 5 It is the magnet suspension relationship diagram on the right.

[0026] Figure 6 This is a radial force analysis diagram of the left end magnet in the magnetic levitation demonstration system of the present invention.

[0027] Figure 7 This is an analysis diagram of the axial force on the right end magnet in the magnetic levitation demonstration system of the present invention.

[0028] Figure 8 It is a diagram showing the magnetic lines of force between coils in the same group of positioning coils.

[0029] Figure 9 It is a schematic diagram of the magnetic pole arrangement of each permanent magnet in the rotating magnet group.

[0030] Figure 10 It is a structural schematic diagram of the magnetic levitation demonstration system of the present invention after the float is added with the sleeve.

[0031] Figure 11 It is the structural block diagram of the system controller.

[0032] In the figure: 1, bottom plate, 2, float traction coil, 3, left end suspension magnet, 4, shaft, 5, rotating magnet group, 6, right end suspension magnet, 7, positioning coil group, 8, float support pad, 9, right end lifting magnet, 10, rotating drive coil group, 11, left end lifting magnet, 12, position sensor, 13, left bracket, 14, right bracket. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings.

[0034] like Figure 1 、 Figure 2 、 Figure 3 As shown, the stator of the magnetic levitation demonstration system of the present invention comprises a rectangular flat plate-shaped base plate 1, with a left bracket 13 disposed at one end and a right bracket 14 disposed at the other end. The left bracket 13 and the right bracket 14 face each other. A float pulling coil 2 is centrally located on the outer side of the left bracket 13; a float support pad 8 is centrally located on the inner side of the right bracket 14. A position sensor 12 is centrally located on the outer side of the right bracket 14. A coil is positioned above, below, to the left, and to the right of the position sensor 12. These four coils form a float positioning coil assembly 7. A rotational drive coil assembly 10, consisting of four coils arranged in a line, is also located in the center of the base plate 1. These four coils are arranged linearly along the axis of the float. A left-end lifting magnet 11 is also located on the base plate 1 inside the left bracket 13, and a right-end lifting magnet 9 is located on the base plate 1 inside the right bracket 14. The left end lifting magnet 11 and the right end lifting magnet 9 are both composed of two cylindrical magnets arranged side by side with space between them; the two cylindrical magnets in each lifting magnet are axially magnetized and have the same magnetization direction to form a stable and uniform lifting magnetic field in the middle of the two.

[0035] like Figure 1 、 Figure 9As shown, the float in the magnetic levitation demonstration system of the present invention comprises a horizontal shaft 4 and a rotating magnet assembly 5 extending through the middle of the shaft. The rotating magnet assembly 5 comprises four annular permanent magnets, all radially magnetized and equally spaced. The magnetic fields of the permanent magnets are distributed equiangularly along the radial circumference of the shaft, meaning that each magnet divides the float's circumferential angle equally according to its magnetic pole orientation. In this embodiment, the four permanent magnets are arranged in the middle of the shaft 4 with their poles spaced 45° apart (the circumferential angle is 180°, divided equally by the four permanent magnets, i.e., 180° ÷ 4 = 45°). These four permanent magnets are positioned one above the other, one above the other, and are installed in a spiral pattern according to their magnetic pole orientation. The left end of the shaft 4 is connected and fixed with a left end suspension magnet 3, and the right end of the shaft 4 is connected and fixed with a right end suspension magnet 6. The left end suspension magnet 3 is vertically opposite to the left end lifting magnet 11 on the stator, and the right end suspension magnet 6 is vertically opposite to the right end lifting magnet 9 on the stator.

[0036] The left end suspension magnet 3 in the float is a cylindrical magnet, which is axially magnetized and has the same magnetization direction as the two cylindrical magnets in the left end lifting magnet 11 ( Figure 4 The right end suspension magnet 6 is also a cylindrical magnet, axially magnetized, and has the same magnetization direction as the two cylindrical magnets in the right end lifting magnet 9 ( Figure 5 ), so that the magnetic repulsion force that lifts the float can be generated, and the magnetic field relationship formed between the suspension magnet on the float and the lifting magnet on the stator can be made independent of the rotation of the float.

[0037] In the magnetic levitation demonstration system of the present invention, the stator supports the float through a supporting mechanism at both ends. The supporting mechanism includes a right-end supporting magnet 9 and a left-end supporting magnet 11 on the stator, and also includes a left-end levitation magnet 3 and a right-end levitation magnet 6 on the float. The two cylindrical magnets in each supporting magnet (9, 11) on the stator are axially magnetized, uniformly magnetized, and magnetized in the same direction, and are arranged side by side on the base plate 1 at a certain distance. The supporting magnets (9, 11) at both ends of the stator correspond to the levitation magnets (3, 6) at both ends of the float, thereby supporting the float and, under the control of the system controller, achieving a stable equilibrium state.

[0038] The following is a brief analysis and explanation of the lifting mechanics relationship of the magnetic levitation demonstration system of the present invention.

[0039] like Figure 1As shown, when the float is located directly above the stator, the left end suspension magnet 3 and the right end suspension magnet 6 correspond to the lifting magnet on the stator below. The magnetic fields of the left end suspension magnet 3 and the left end lifting magnet 11 are in the same direction and are located in the same vertical plane, so they are all subject to repulsive forces (see Figure 4 and Figure 5 Since the two cylindrical magnets of the left end lifting magnet 11 are fixed on the bottom plate 1, the only part that can move is the left end suspension magnet 3. Figure 6 As shown, the gravity of the left end suspension magnet 3 is G, which is supported by the two single magnets in the left end lifting magnet 11 from two directions. At this time, the gravity G of the float can be decomposed into the component forces G pointing to the left and right single magnets in the left end lifting magnet 11. L and G R The lifting forces of the two single magnets pointing to the left end suspension magnet 3 are N L and N R The gravity component vector G in the figure L , G R It can be decomposed into F L 、F LV and F R 、F RV , the corresponding support force component vector N L 、N R It is decomposed into N LV 、N LH and N RV 、N RH It can be seen that when the float is in a free suspension state, the existence of gravity G also ensures that the force F can be generated to offset the radial displacement of the float. LV and F RV Radial stability force (N LH and N RH ). Therefore, while the vertical gravity of the float is balanced, its radial translation is also balanced because the left-end suspension magnet 3 and the right-end suspension magnet 6 are both in the stator magnetic field structure where their radial movement is restricted.

[0040] like Figure 2 、 Figure 3 、 Figure 4 、 Figure 5As shown, an axial position control mechanism is provided at each end of the stator. The axial position control mechanism includes a float traction coil 2 mounted on the left bracket 13 and a positioning coil group 7 and a position sensor 12 mounted on the right bracket 14. The position sensor 12 is used to accurately position the right-end suspension magnet 6 in three dimensions. Any deviation of the right end of the float is transmitted to the suspension control unit of the system controller in real time. The positioning coil group 7 is used to accurately adjust the vertical and radial position of the right-end suspension magnet 6 on the shaft 4; and the float traction coil 2 at the left end is used to provide axial traction to the entire float, and the entire axial position of the float is adjusted by the left-end suspension magnet 3 fixed to the left end of the shaft 4.

[0041] like Figure 11 As shown, the system controller includes a suspension control unit, a suspension drive circuit, a rotation control unit, and a rotation drive circuit. The suspension control unit receives detection data from the position sensor 12 in real time, determines the current axial deviation of the float based on the right-end suspension magnet 6 on the float, and accordingly drives the float traction coil 2 through the suspension drive circuit to adjust the axial position of the left-end suspension magnet 3 on the float. The advantage of this single-end positioning and opposite-side control method is that it avoids the mutual interference between the magnetic fields when the axial position detection and positioning adjustment of a conventional magnetic suspension system are performed in the same position. This minimizes the influence of the magnetic field at the control end on the magnetic field at the positioning end of the magnetic suspension system, greatly improving overall stability.

[0042] When a traditional magnetic levitation device stops working, the float will naturally fall off. When the power is turned on and the working state is restored, the float must be placed in a suitable working position. Therefore, certain methods and techniques are also required. In order to enable the float in the present invention to automatically return to the fully suspended working state every time the power is turned on, the float must have a fixed stop position after each power outage. The system structure of the present invention can ensure that the float can naturally deflect axially toward its right end when the entire system stops working, so that its right end directly rests on the float support pad 8 on the inner side of the right bracket 14, forming an axial mechanical fulcrum, so that the entire float can be balanced in the new position and is in a "semi-suspended" state that is supported by mechanical means at the axial right end. The specific mechanical relationship can be analyzed and explained as follows.

[0043] The spacing between the left-end levitation magnet 3 and the right-end levitation magnet 6 in the float can be larger or smaller than the spacing between the left-end lifting magnet 11 and the right-end lifting magnet 9 on the stator. This embodiment uses "larger" as an example for explanation. During normal operation, the left-end levitation magnet 3 and the left-end lifting magnet 11 are aligned vertically to obtain the maximum lifting force ( Figure 4 The right end suspension magnet 3 and the right end lifting magnet 9 are not completely aligned, but slightly protrude to the right ( Figure 5). This way the lifting force on the right side of the float does not completely coincide with its gravity, but is slightly tilted to the right. Figure 7 As shown, the right end suspension magnet 6 is subjected to the lifting force F of the right end lifting magnet pair 9 along the line connecting its center position C1 and the center C2 of the right end lifting magnet pair 9. This force can be decomposed into the vertical upward lifting force F V , and a rightward axial force F is decomposed H When the magnetic levitation demonstration system is working normally, the float traction coil 2 provides the axial force F H The attraction forces of equal magnitude and opposite direction make the axial force on the float zero and the float is in a stable equilibrium state. When the system stops working, the attraction provided by the float traction coil 2 disappears, and the right-hand component force F H This force component pulls the float to the right, causing it to rest directly against the float support pad 8 on the inner side of the right bracket 14. This structure prevents the float from moving leftward on its own. By adjusting the thickness of the float support pad 8, the float's resting distance can be easily adjusted.

[0044] When the magnetic levitation demonstration system is powered on, the electromagnetic attraction of the float traction coil 2 pulls the float back to its suspended equilibrium position. Thus, the system automatically returns to its working state without the need for any manual reset or the aid of other mechanical devices. At this point, the left-end levitation magnet 3 is aligned with the left-end lifting magnet 11. The axial force component of the left-end levitation magnet 3 itself is zero, while the float always needs to be attracted by the float traction coil 2 to balance the right-direction force component exerted on the right-end levitation magnet 6. Therefore, once one end of the left-end levitation magnet 3 deviates radially or vertically, the attraction of the float traction coil 2 will cause the left-end levitation magnet 3 to automatically point to the center of the float traction coil 2, thereby ensuring the stability of the left end of the float.

[0045] Because position sensor 12 is located at the right end of the magnetic levitation demonstration system, the stability of the right-end levitation magnet 6 plays a crucial role in the stability of the entire magnetic levitation demonstration system. Therefore, a set of positioning coils, namely positioning coil assembly 7, is installed on the right side of the stator. This allows for precise radial and vertical adjustment of the right-end levitation magnet 6, combined with the three-dimensional data from position sensor 12, to ensure the right end of the float is as stable as possible.

[0046] like Figure 3As shown, the positioning coil group 7 includes four coils with identical physical structures and electrical parameters. The four coils are fixed at the top, bottom, left, and right of the position sensor, with the position sensor 12 as the center. The four coils are divided into a vertical positioning coil group of the upper and lower groups and a radial positioning coil group of the left and right groups. The two coils in each group are connected in series or in parallel, but the directions of the current flowing through them should be opposite, so that the magnetic poles generated by the two coils in each group are opposite, thereby forming a closed magnetic field line (i.e. Figure 8 (dashed line in ).

[0047] It can be seen that the effect of the regulating magnetic field generated by the coils on position sensor 12 is zero only when position sensor 12 is fixed midway between the two co-directional coils and its height is half that of the coils. This means that position sensor 12 is immune to interference from changes in the regulating magnetic field, both radially and vertically. In the magnetic levitation demonstration system of the present invention, axial adjustment of the float is achieved by float traction coil 2, located on the left side of the system. This coil is located at a considerable distance from position sensor 12, making the effect of the generated traction magnetic field on the position sensor negligible.

[0048] As can be seen, the positioning and stabilization methods at each end of the float are different. The vertical and radial positioning of the right end of the float are respectively performed by the vertical positioning coil and radial positioning coil in the local positioning coil assembly 7, while the vertical and radial positioning of the left end of the float, as well as the axial positioning of the entire float, are all performed by the float pulling coil 2. Therefore, the "dual-end support, single-end positioning, and opposite-side axis control" technology used in the magnetic levitation demonstration system of the present invention can ensure the stability of the float's suspension state in a very simple and reliable manner.

[0049] In the magnetic levitation demonstration system of the present invention, the float rotation is realized by adopting a structure in which the linear arrangement of the rotating drive coil is matched with the spiral installation of the float permanent magnet. Figure 9 As shown, the four annular permanent magnets in the rotating magnet group 5 located in the middle of the float each have a pair of radially magnetized poles and are fixed to the shaft 4 in sequence and at equal intervals, with the pole sequence differing by 45 degrees. Four coils are mounted on the base plate 1, arranged in an equidistant linear pattern, to form the rotation control coil group 10. These four coils correspond one-to-one with the four annular permanent magnets on the float. By applying regular pulses or sinusoidal drive to the four coils in the rotation drive coil group 10 in an open-loop control method similar to that of a traditional stepper motor or permanent magnet synchronous motor, the entire float can be stably rotated around the shaft in a stepwise or continuous manner. This achieves complete suspension and controlled rotation of the horizontal axial float, making it a true "levitated rotor."

[0050] In practice, as long as there are three or more radially magnetized permanent magnets, and the magnetic fields of these permanent magnets are distributed at equal angles along the radial circumference of the float, and are combined with the corresponding drive coils and power supply method of the rotating drive coil assembly 10, the basic function of rotating the float can be achieved. In specific implementation, it is necessary to combine the requirements and control of rotational stability with the characteristics of the drive device to determine the solution. If a lightweight sleeve made of non-magnetic material is added to the outside of the float, the demonstration and viewing effect of its suspension and rotation can be further improved ( Figure 10 ).

[0051] like Figure 11 As shown, the system controller of the magnetic levitation demonstration system of the present invention includes a suspension control unit, a suspension drive circuit, a rotation control unit, and a rotation drive circuit. The suspension control unit and the rotation control unit can utilize a single-chip microcomputer. The position sensor 12 transmits all three-dimensional position information (including vertical, radial, and axial position information) of the float to the suspension control unit, which serves as the primary source of data for the float's suspension and tracking status. The suspension control unit receives the detection data from the position sensor 12 in real time. Using algorithms such as PID, the control unit determines the required energization pattern or state for each vertical and radial coil in the positioning coil assembly 7 and outputs this data to the suspension drive circuit. After power amplification, the control circuit drives the corresponding radial and / or axial positioning coils in the positioning coil assembly 7 to adjust the float's position for stable suspension.

[0052] The axial position information from the position sensor 12 is also transmitted to the rotation control unit. This automatically activates the float rotation function upon receiving a signal indicating the float is axially in position and properly suspended. The float rotation mode can be pre-set in the program or manually set or directly controlled. After receiving and amplifying the instructions from the rotation control unit, the rotation drive circuit adjusts the direction and intensity of the excitation current in the four coils of the rotation drive coil assembly 10 to determine the float's stepwise or continuous rotation mode, as well as the float's rotation speed and direction, thereby achieving the optimal demonstration or viewing effect.

Claims

1. A magnetic levitation demonstration system for displaying a horizontal rotating shaft, comprising a stator and a float, characterized in that: The stator includes a base plate, a left bracket and a right bracket arranged on the base plate, a float traction coil arranged on the left bracket, a positioning coil group and a position sensor arranged on the right bracket, a rotation drive coil group arranged in the middle of the base plate, and a left end lifting magnet and a right end lifting magnet arranged on the base plate; the left end lifting magnet and the right end lifting magnet are both composed of two cylindrical magnets arranged side by side on the base plate at a certain distance. The float comprises a horizontal shaft, a rotating magnet group passing through the middle of the shaft, and a left-end suspension magnet and a right-end suspension magnet arranged at the ends of the shaft. The left-end levitation magnet is opposite to the left-end lifting magnet in vertical direction, and the right-end levitation magnet is opposite to the right-end lifting magnet in vertical direction, so as to generate a magnetic repulsive force to lift the float; the magnets in the rotating magnet group correspond one-to-one to the coils in the rotating drive coil group and are opposite to each other in vertical direction, so as to generate a driving force to rotate the float.

2. The magnetic levitation demonstration system for displaying a horizontal rotating shaft state according to claim 1 is characterized in that: The left-end lifting magnet and the right-end lifting magnet are both composed of two cylindrical magnets arranged side by side and spaced apart; both cylindrical magnets are axially magnetized and have the same magnetization direction to form a stable and uniform lifting magnetic field in the middle of the two.

3. The magnetic levitation demonstration system for displaying a horizontal rotating shaft state according to claim 2 is characterized in that: The left end suspension magnet is a cylindrical magnet, axially magnetized, and has the same magnetization direction as the magnet pair in the left end lifting magnet; the right end suspension magnet is a cylindrical magnet, axially magnetized, and has the same magnetization direction as the magnet pair in the right end lifting magnet.

4. The magnetic levitation demonstration system for displaying a horizontal rotating shaft state according to claim 1 is characterized in that: The positioning coil group includes four coils with the same physical structure and electrical parameters. The four coils are distributed in the four directions of the position sensor: up, down, left and right. The four coils are divided into one group of up and down and one group of left and right. The two coils in each group are connected in series or in parallel, and the directions of the currents flowing through them are opposite.

5. The magnetic levitation demonstration system for displaying a horizontal rotating shaft state according to claim 4 is characterized in that: The position sensor is at the same distance from the four coils in the positioning coil group, and its height protruding from the support plate surface is half of the height of the coil.

6. The magnetic levitation demonstration system for displaying a horizontal rotating shaft state according to claim 1 is characterized in that: The rotating magnet group includes at least three annular permanent magnets, which are radially magnetized and fixed on the shaft at equal intervals. The magnetic field directions of each permanent magnet are distributed at equal angles on the radial circumference of the shaft, that is, each permanent magnet divides the angle of the float's circumference equally in the order of its respective magnetic pole directions.

7. The magnetic levitation demonstration system for displaying a horizontal rotating shaft state according to claim 1 is characterized in that: The rotary drive coil group includes coils having the same number as the permanent magnets in the rotary magnet group. All coils are arranged in a line on the bottom plate along the length of the shaft, with one coil and one permanent magnet facing each other in the upper and lower positions.

8. The magnetic levitation demonstration system for displaying a horizontal rotating shaft state according to claim 1 is characterized in that: The spacing between the left-end levitation magnet and the right-end levitation magnet is not equal to the spacing between the left-end lifting magnet and the right-end lifting magnet.

9. The magnetic levitation demonstration system for displaying a horizontal rotating shaft state according to claim 1, characterized in that: The coils in the rotation driving coil assembly are arranged linearly along the axial direction of the float.

10. The magnetic levitation demonstration system for displaying a horizontal rotating shaft state according to claim 1, characterized in that: The permanent magnets in the rotating magnet group are installed in a spiral manner according to the direction of their magnetic poles.

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