DESIGN OF PERMANENT MAGNET REPRESENTING THE SUN
The permanent magnet representing the sun can be spherical, square, rectangular or cylindrical10,11. Permanent magnet that represents the sun, abbreviated as "sun" magnet. Each "sun" magnet was installed on the top of the shaft of each DC motor (DC motor model: ZYTD520, DC-24V, 5000 r/min, Gear-box motor, ZGB37RG, DC 24V, rpm: 650)12. The centreline of the shaft passed through the center of mass of each "sun" magnet. The DC motor base was round and made of non-magnetic material. The round surface of the base was perpendicular to the rotation axis of the DC motor, making it stable when the base was placed on a horizontal surface. The speed of the DC motor was controlled using an AC / DC power adapter, and the DC moto speed (stop, slow, fast) varied between 60–650 r/min (AC/DC power adapter model: MXD-24W024, INPUT: AC100-240V 50/60 Hz, OUTPUT: DC 1–24 V 100–1000 mA)13. In order to distinguish these "sun" magnets with exactly the same shape, size and magnetic material, they were labeled from "sun"m1, "sun"m2, "sun"m3 to "sun"m14. Every "sun" magnets from "sun"m3 to "sun"m14 has the same shape, size and material grade. The north and south poles of the each "sun" magnet were marked "N" and "S" respectively (See "sun"m1 in Fig. 1)14. The magnetic material grades and magnetic parameters corresponding to the names "sun"m1, "sun"m2 and "sun"m3 are shown in Table 1. The shapes and sizes of "sun"m1, "sun"m2 and "sun"m3 are presented in Table 2.
DESIGN OF MAGNET REPRESENTING THE PLANETS
The permanent magnets representing the planets were Spherical15,16. abbreviated as "planet" magnet. Each "planet" magnets was placed at the centre of a hollow spherical object floating on water to ensure free rotation. Alternatively, the "planet" magnets could be directly placed in a round transparent container with a concave bottom or on the palm of the experimenter. For convenient observation and research, the north and south poles of each "planet" magnets were marked with dots in two different colours. A bisected circle perpendicular to the N–S pole axis (such as the equator of Earth) was then drawn on each spherical magnet. The two semicircles of the bisected circle were marked in two different colours. In order to distinguish "planet" magnets with the same size and material grade. They were labeled as "planet"m①, "planet"m②, "planet"m③ and "planet"m④ and distinguish them from the "sun" magnet on DC motors17,18,19. "planet"m① and "planet"m② have the same size, and material grade. "planet"m③ and "planet"m④ have the same size and material grade. "planet"m① and "planet"m③ have different size and material grade. During the experiment, each "planet" magnets was independent and could not stick to other magnets (See Fig. 2)14. The magnetic material grades and magnetic parameters corresponding to the names "planet"m①, "planet"m②, "planet"m③ and "planet"m④ are shown in Table 1. The sizes of "planet"m①, "planet"m②, "planet"m③ and "planet"m④ are shown in Fig. 2.
TABLE 1 The magnetic parameters corresponding to the names of the "sun" and "planet" magnets
Name
|
Grade
|
Br
|
Hcb(BHC)
|
Hcj(IHC)
|
(BH)max
|
MT
|
KG
|
KA/m
|
KOe
|
KA/m
|
KOe
|
Kj/m³
|
MGOe
|
"sun"m1
|
N35
|
1170/1210
|
11.7/12.1
|
876/899
|
11/11.3
|
≥955
|
≥12
|
263/279
|
33/36
|
"sun"m2
|
N42
|
1290/1320
|
12.9/13.2
|
836/876
|
10.5/11
|
≥955
|
≥12
|
318/334
|
40/42
|
"sun"m3
|
Y30
|
370/400
|
3.7/4.0
|
175/210
|
2.20/2.64
|
180/220
|
2.26/2.7
|
26.0/30.0
|
3.3/3.8
|
"planet"m①
|
N42
|
1209/1320
|
12.9/13.2
|
836/876
|
10.5/11
|
≥955
|
≥12
|
318/334
|
40/42
|
"planet"m②
|
N42
|
1290/1320
|
12.9/13.2
|
836/876
|
10.5/11
|
≥955
|
≥12
|
318/334
|
40/42
|
"planet"m③
|
Y30
|
370/400
|
3.7/4.0
|
175/210
|
2.20/2.64
|
180/220
|
2.26/2.7
|
26.0/30.0
|
3.3/3.8
|
"planet"m④
|
Y30
|
370/400
|
3.7/4.0
|
175/210
|
2.20/2.64
|
180/220
|
2.26/2.7
|
26.0/30.0
|
3.3/3.8
|
DEVICE FOR OBSERVING THE REASON OF MAGNET ROTATION
The Spherical permanent magnet ("sun"m1) was used20. An arbitrary circle passing through the N and S poles of "sun"m1 was drawn on the sphere. To divide these semicircles in half, two points, A and B, were selected on the NS and SN semicircles. Therefore, the central angles of arcs NA, NB, SA, and SB arcs were all 90°. Then, two arbitrary arcs were selected, such as NB and SA. The N and S points were set at 0°, whereas points A and B were set at 90°. The subdivisions between 0° and 90° were then marked on arcs SA and NB. The top of the rotating shaft in the DC motor was aligned at any point between 0° and 90° on "sun"m1; therefore, the centreline of the shaft passed through the center of mass of "sun"m1 (See "sun"m1 in Fig. 1)14.
EXPERIMENTAL SETUPS AND PROCEDURES
First, a spherical "sun"m1 was installed at the top of the rotating shaft of DC motor. The top of the axis is connected to point (B) on "sun"m1. The N and S poles of "sun"m1 were aligned perpendicular to the rotating shaft. The rotation speed of "sun"m1 was varied between 60 to 650 r/min using a DC motor speed controller21. Next, "planet"m① was placed inside a hollow spherical object that floated on water. "planet"m① was then placed in a round transparent container filled with water. During the experiment, "sun"m1 and "planet"m① were kept away from ferromagnetic objects, and the temperature is below80 ℃. (See Fig. 1)14.
In experiment A, "planet"m① was placed at approximately 10–30 cm from the centre of "sun"m1. Taking the horizontal plane in the round transparent container, marked magnetic poles and double-coloured circles on "planet"m① as the frame of reference. "sun"m1 was rotated at a speed of 60–180 r/min. Under the action of the rotating torque of "sun"m1, the behavior of "planet"m① floating in a circular transparent container was observed.
In experiment B, with "sun"m1 as the center, slowly moved the "planet"m① back and forth at distance of 10–30 cm, keeping it away from or near the "sun"m1. Then, the speed of "sun"m1 was repeatedly varied from 60 r/min to a maximum speed 650 r/min. Observed the relationship between the rotation behavior of "planet"m① and the distance of "sun"m1, as well as the relationship with the rotational speed of "sun"m1.
In experiment C, "planet"m① was placed at 10–30 cm from "sun"m1. When "sun"m1 rotated at 60–120 r/min, the rotational speed relationship between "planet"m① and "sun"m1 was observed. When the rotational speed of "sun"m1 exceeded 120 r/min, the rotational speed relationship between "sun"m1 and "planet"m① was measured using a photoelectric digital tachometer (Non-contact).
In experiment D, with "sun"m1 as the center, "planet"m① was slowly moved away from the "sun"m1 to farther distances: (1) When the "planet"m① is placed in every position away from the "sun"m1. First, let the "sun"m1 stops rotating, and the "planet"m① is static. Next, let the "sun"m1 on the DC motor was rotated in the range 0–120 r/min. Then, the maximum rotation distance (r1) between the first kind of "sun"m1 and the "planet"m① is measured. (2) First, let the "sun"m1 rotate in the range of 60–120 r/min, the "planet"m① is rotating. Next, slowly move the "planet"m① from the position of the first kind maximum rotation distance until the "planet"m① reaches the farthest rotation position. Then, the maximum rotation distance (r2) between the second kind of "sun"m1 and the "planet"m① is measured. (3) When the rotating "planet"m① is placed in every different position away from the "sun"m1. Observed the position change of the "planet"m① floating on the water surface of the circular container. Based on the above method, "sun"m1, "sun"m2 and "sun"m3 of different shapes, sizes and magnetic material grades are used on the same horizontal plane, and "planet"m①, "planet"m②, "planet"m③ and "planet"m④ are used for permanent magnet rotation. Then, the two kinds of maximum rotation distances (r1) and (r2) between each "planet" magnet and each "sun" magnet are measured (avoided using a ferromagnetic ruler for the measurements). The results are presented in Table 2.
In experiment E, 12 permanent magnets with the same shape, size and material grade as the "sun"m3 are used. When the different magnetic poles of these permanent magnets attract each other, the magnetic pole can spontaneously remain on the same line. "sun"m4 consists of two magnets, "sun"m5 consists of three magnets, "sun"m14 consists of 12 magnets. From "sun"m4 to "sun"m14, add one magnet for each "sun" magnet one by one. Then, "planet"m① and each "sun" magnet from "sun"m4 to "sun"m14 are used for permanent magnet rotation. Measure the two kinds of maximum rotation distances (r1) and (r2) between "planet"m① and each "sun" magnet from "sun"m4 to "sun"m14. The results are presented in Table 3.
In experiment F, first, with the center of mass of "sun"m1 as the center of the circle and take a round surface, the round surface is perpendicular to the horizontal plane. On the surface of this circle, slowly move the "planet"m① away from the "sun"m1. Starting from the horizontal plane 0 °, the operation was repeated at angles of 30 °, 60 °, 90 °, 120 °, 150 °, 180 °, 210 °, 240 °, 270 °, 300 °and 330 °, respectively. Then, at each angle listed above, measure the second kind of maximum rotation distance (r2) between the "planet"m① and the "sun"m1. The results are presented in Table 4. Next, based on the above methods, with the two-color circle on the "planet"m① as the frame of reference The rotation direction of "planet"m① is observed from different angles and compared with that of "sun"m1.
In experiment G, the "sun"m1 was the center, rotating at 60–180 r/min. "planet"m① and "planet"m② are located on the left and right sides of "sun"m1. Under the action of "sun"m1 rotation torque, the "planet"m① and "planet"m② always keep rotating in the magnetic field. (1) First, the rotating "planet"m① is placed at the position of the second kind maximum rotation distance. On the straight line passing through the centre of mass of "sun"m1 and "planet"m①, let the rotating "planet"m② slowly approach "planet"m①. Next, place the rotating "planet"m① at a different distance from the "sun"m1. The distance between "planet"m① and the "sun"m1 is 50 cm. The distance between "planet"m① and the "sun"m1 is 30 cm. Then, measure the minimum distance between the front and rear positions of "planet"m① and "planet"m② that does not affect each other's rotation. Based on the minimum distance between "planet"m① and "planet"m② that does not affect each other's rotation. The second kind maximum rotation distance between "planet"m② or "planet"m① and "sun"m1. Several "planet" magnets identical to "planet"m① and "planet"m② are arranged in a straight line from far to near. Then, count the number of "planet" magnets. (2) First, the rotating "planet"m① is placed at the position of the second kind of maximum rotation distance. On the straight line passing through the centre of mass of "sun"m1 and "planet"m①, let the rotating "planet"m② approach "planet"m① from up, down, left and right directions. Next, place the rotating "planet"m① at a different distance from the "sun"m1. The distance between "planet"m① and the "sun"m1 is 50 cm. The distance between "planet"m① and the "sun"m1 is 30 cm. The distance between "planet"m① and the "sun"m1 is 10 cm. Then, different positions from "planet"m① to "sun"m1, measure the minimum distance between the up, down, left and right positions of "planet"m① and "planet"m② that does not affect each other's rotation. Based on the minimum distance between "planet"m① and "planet"m② that does not affect each other's rotation. The second kind maximum rotation distance between "planet"m② or "planet"m① and "sun"m1. In each position where "planet"m① is placed, with "planet"m① as the center, several "planet" magnets are arranged, and the "planet" magnets are the same as "planet"m① and "planet"m②. Then, count the number of "planet" magnets for each position and the total number of three positions.
In experiment H, based on the maximum rotation distance between of "sun" magnet and "planet" magnets, within the second kind maximum rotation distance of "sun" magnet and "planet" magnet. First, put the undesigned floating "planet"m① directly into a smooth circular transparent container with a concave bottom. In order to enhance the stability of the rotation of the "planet"m①, round container is filled with water. The "sun"m1 was the center, rotating at 60 r/min. On the same horizontal plane, the rotating "planet"m① is placed at different positions away from the "sun"m1. (1) Observed the change of the angle between the polar direction of "planet"m① and the floating horizontal plane. (2) Observe the change of the angle between the polar direction of "planet"m① and the rotation axis. The observation method is as follows: When the rotating "planet"m① is placed at different positions away from the "sun"m1. Taking the horizontal plane in the round transparent container, marked magnetic poles and double-coloured circles on "planet"m① as the frame of reference. Then, observed the changing behavior of both ends of the "planet"m① magnetic pole.
In experiment I, "planet"m① was placed on the palm of the hand, and "sun"m1 was rotated at 60–650 r/min using the DC motor speed controller. The DC motor to which "sun"m1 was attached and the sphere containing "planet"m① were held in the left and right hands of the experimenter, respectively. Then, the distance between "sun"m1 and "planet"m① was varied between 5 and 30 cm, and the experimenter could feeling the strength of the two different types of magnetic forces between "planet"m① and "sun"m123,24.
In experiment J, (1) The distance between "planet"m① and "sun"m1 was set to 15–30 cm. The top of the rotating shaft of the DC motor was aligned at each point between 0° and 14°, from S to A or N to B, whereas "sun"m1 was rotated at 60–650 r/min. Taking magnetic pole dots and double-coloured circles marked on "planet"m① as the frame of reference. The resulting rotation behaviour of "planet"m① was then recorded (See Fig. 1). (2) The distance between "sun"m1 and "planet"m① was set to 15–30 cm, and "sun"m1 was rotated at 60–180 r/min. The top of the rotating shaft in the DC motor was aligned at points between 15° and 22° from S to A or from N to B. Taking magnetic pole dots and double-coloured circles marked on "planet"m① as the frame of reference. The resulting rotation behaviour of "planet"m①, and the relationship between the rotating speeds of "sun"m1 and "planet"m① were then observed (See Fig. 1). (3) The distance between "sun"m1 and "planet"m① was set to 15–30 cm, and "sun"m1 was rotated at 60–120 r/min. The top of the rotating shaft in the DC motor was aligned at points between 23° and 90° from S to A or from N to B. Taking magnetic pole dots and double-coloured circles marked on "planet"m① as the frame of reference. The resulting rotation behaviour of "planet"m① was then observed (See Fig. 1).