CN112116853A

CN112116853A - Rotating magnetic field experimental device

Info

Publication number: CN112116853A
Application number: CN202010944616.XA
Authority: CN
Inventors: 王庆波; 文灵华
Original assignee: Yanshan University
Current assignee: Yanshan University
Priority date: 2020-09-10
Filing date: 2020-09-10
Publication date: 2020-12-22

Abstract

The utility model provides a rotating magnetic field experimental apparatus, includes the base, and the base is fixed mounting respectively about all around has the montant, and the pedestal mounting has positive negative pole magnet, and the base top is equipped with the ring cover, and the interior circle middle part of ring cover is equipped with the grafting ring cover, and first circular through-hole is established to the fan ring, has seted up the recess on the adjacent fan ring piece, and grafting ring cover middle part cover is equipped with vertical insulating axle, and the ring cover inboard is equipped with a pair of carbon brush with the centre of a circle symmetry. The invention clearly presents the phenomenon that the component force of the Lorentz force applied to the direct current motor in the moving direction is zero when a single group of winding coils rotate to be vertical to the magnetic field to an experimenter through taking the rotating speed and the centrifugal force as media in a stroke mode.

Description

Rotating magnetic field experimental device

Technical Field

The invention belongs to the field of experimental equipment of electromagnetism, and particularly relates to a rotating magnetic field experimental device.

Background

In the Lorentz force physical experiment of common high school education, when a single group of winding coils of a motor rotate to be vertical to a magnetic field, the component force of the Lorentz force along the motion direction is zero, at the moment, the single group of winding coils continuously rotate only by inertia, in order to solve the problem, researchers provide that the multiple groups of winding coils are uniformly distributed, the multiple groups of winding coils are always forcefully held during rotation, the more winding coils are, the more balanced the force on an output shaft of the motor is during rotation, the more stable the output torque of the output shaft of the motor is, in order to better perform the operation and observation of the Lorentz force experiment, the better the experiment phenomenon and the result are presented to students, and a rotary magnetic field experiment device is designed.

Disclosure of Invention

The invention provides a rotating magnetic field experimental device which is used for overcoming the defects in the prior art.

The invention is realized by the following technical scheme:

a rotating magnetic field experimental device comprises a base, wherein vertical rods are fixedly arranged on the front side, the rear side, the left side and the right side of the base respectively, positive and negative magnets are fixedly arranged in the middle of the inner side walls of the vertical rods on the left side and the right side of the base respectively, a ring sleeve is arranged at the top of the base and is connected with the base through inverted L-shaped connecting rods, an inserting ring sleeve is arranged in the middle of the inner circle of the ring sleeve and is formed by winding 2 n fan ring blocks, n is a positive integer larger than one, first circular through holes in the vertical direction are formed in the middle of each fan ring block, semicircular grooves in the vertical direction are formed in the adjacent surfaces of the adjacent fan ring blocks, a vertical insulating shaft is sleeved in the middle of the inserting ring sleeve, the side surface of the insulating shaft is fixedly connected with the inner circular surface of each fan ring block, the bottom of the insulating shaft is rotatably connected with the top surface, the top of each vertical rod is fixedly provided with the same horizontal circular plate, the middle of each circular plate is provided with a second circular through hole, the top surface of each circular plate is stacked with a plurality of pieces of paper with a central round hole, the top of each insulating rod penetrates through the second circular through hole and is fixedly provided with a square block, a cylindrical block is arranged above the square block, the bottom of the cylindrical block is provided with a square blind hole corresponding to the square block, the square blind hole is in splicing fit with the square block, the side surface of the cylindrical block is fixedly provided with a first elastic telescopic rod with a movable rod outwards, the movable rod of the first elastic telescopic rod is fixedly provided with a shaft sleeve, the lower side surface of the shaft sleeve is fixedly provided with a second elastic telescopic rod with a movable rod downwards, the bottom of the movable rod of the second elastic telescopic rod; the conductor blocks can be inserted into the semicircular grooves of the adjacent surfaces of the adjacent sector ring blocks; the winding loop is characterized by further comprising a plurality of winding coils, and the lower joints of the winding coils can be inserted into the first symmetrical circular through holes or the semicircular grooves along the central axis of the insertion loop sleeve.

The rotating magnetic field experimental device comprises a ring sleeve, wherein a third guide through hole is formed in the middle of the inner side wall of each of the left side and the right side of the ring sleeve, a trapezoidal sliding block is arranged in each of the third guide through holes, the outer side wall of each trapezoidal sliding block is a T-shaped inclined plane with the upper portion inclined towards the axis of the ring sleeve, the inner side wall of each trapezoidal sliding block is fixedly connected with the corresponding outer side wall of the carbon brush, first sliding grooves along the vertical direction are formed in the outer side walls of the left side and the right side of the ring sleeve, inverted L-shaped connecting rods symmetrical along the central axis of the ring sleeve are arranged on the left side and the right side of the top of a base, the lower ends of vertical rods of the inverted L-shaped connecting rods are fixedly connected with the base, second sliding grooves are formed in the inner sides of cross rods of the inverted L-shaped connecting rods, the inner side surfaces of the second sliding grooves are inclined planes with the, the inner side wall of the cross rod of the inverted L-shaped connecting rod is in contact fit with the outer side wall of the first sliding groove, and the inner side of the top of the cross rod of the inverted L-shaped connecting rod is connected with the top of the corresponding first sliding groove through a spring.

According to the rotating magnetic field experimental device, the winding coil main bodies are symmetrical along the central axis of the plug-in ring sleeve.

The rotating magnetic field experimental device comprises a winding coil and a rotating magnetic field, wherein the winding coil comprises a circular plug, a hard C-shaped wire and an annular ring, the circular plugs on the left side and the right side of the bottom of the winding coil can be inserted into first circular through holes or semicircular grooves which are symmetrical along the central axis of an insulating shaft respectively, the top of each circular plug is fixedly connected with the bottoms of the C-shaped wires on the left side and the right side respectively, the top of each C-shaped wire is fixedly connected with the left side and the right side of the annular ring respectively, the annular ring is made of a conductor material, the outer side wall of the annular ring is subjected to insulation treatment, and the middle part of an insulating rod penetrates through.

According to the rotating magnetic field experimental device, the conductor block comprises a cylinder block, a connecting sheet and a pull ring, the connecting sheet is symmetrically and fixedly installed on the side face of the cylinder block, and the pull ring is fixedly connected to the top of the cylinder block.

The invention has the advantages that: when the device is used for experiments, the comparative experiments can be carried out by winding coils with m groups, wherein m is a positive integer less than or equal to n, for example: when a single-group winding coil experiment is selected, firstly, 2 n fan-ring blocks are equally divided into two equal parts, each fan-ring block is adjacent, all the first circular through holes and two semicircular grooves on adjacent surfaces of the adjacent fan-ring blocks are regarded as an inserting unit, lower connectors of the single-group winding coil are respectively inserted into the middle inserting unit of each equal fan-ring block, and then conductor blocks are inserted into the semicircular grooves on the adjacent surfaces of the adjacent fan-ring blocks in each equal part; similarly, when m groups of winding coils are selected for an experiment, 2 n number of fan ring blocks are uniformly divided into m equal parts, each fan ring block is adjacent, all the first circular through holes and two semicircular grooves on the adjacent surfaces of the adjacent fan ring blocks are regarded as an inserting unit, the lower connectors of the m groups of winding coils are respectively inserted into the inserting unit at the middle of each equal sector ring block, the conductor block is inserted into the semicircular groove in each equal sector ring block, if the semicircular groove is not arranged in each equal sector ring block, the conductor block is not required to be inserted, the carbon brushes are respectively communicated with the positive electrode and the negative electrode of a power supply, so that the winding coils are electrified and are subjected to the action of Lorentz force in the magnetic fields of the positive magnet and the negative magnet to rotate, and the inserting ring sleeve, the insulating shaft, the cylindrical block, the first elastic telescopic rod, the square shaft sleeve, the second elastic telescopic rod and the pen rotate along with the winding coils, because the winding coil is subjected to the Lorentz force with constant direction and magnitude in an isomagnetic field after being electrified with constant current, the Lorentz force is decomposed, one component of the Lorentz force is the force along the moving direction, the included angle between the plane of the winding coil and the magnetic field direction is continuously changed along with the rotation of the winding coil, the component of the Lorentz force on the winding coil in the moving direction is continuously reduced until the plane of the winding coil is vertical to the magnetic field, the component of the Lorentz force on the winding coil in the moving direction is reduced to zero, the rotating speed of the winding coil is always changed under the influence of stress, the movable rod of the first elastic telescopic rod is subjected to different centrifugal forces along with the change of the rotating speed, the rotating speed is higher, the centrifugal force is higher, the movable rod of the first elastic telescopic rod stretches out longer after overcoming the internal elastic force, and the movable rod of the second elastic telescopic rod pushes the pen point to the paper, a pen rotating around an insulating shaft can draw a plurality of connected wavy lines on paper, the farther the distance between a point on the wavy line and a central circular hole of the paper is, the larger the rotating speed of a winding coil at the corresponding position is, and the two wavy lines drawn when a single group of winding coils are inserted are close to an ellipse and have two wave crests, as shown in fig. 7; the more the coils of the inserted winding are, the shorter the single-section wavy line is drawn and the denser the overall distribution is, the number of wave crests is 2 m, and the shape is closer to a circle, as shown in fig. 8; the invention has ingenious structure and reasonable design, clearly presents the phenomenon that the component force of the Lorentz force applied to a direct current motor in the motion direction is zero when a single group of winding coils rotate to be vertical to a magnetic field to an experimenter in a stroke mode by taking the rotating speed and the centrifugal force as media, and also provides a flexible and variable plug-in ring sleeve structure And the operation and observation of experimenters are facilitated, and the experimental results are presented to the experimenters conveniently.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention; FIG. 2 is a view taken along line A of FIG. 1; FIG. 3 is an enlarged view of section I of FIG. 1; FIG. 4 is an enlarged view of section II of FIG. 1; FIG. 5 is a front view of the conductor block; FIG. 6 is a top view of the conductor block; FIG. 7 is a diagram illustrating a first wavy line trace on paper for a single set of winding coil experiments; fig. 8 is a diagram illustrating a second wavy line trace on paper for an m-set winding coil experiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

A rotating magnetic field experimental device comprises a base 1, wherein vertical rods 2 are fixedly arranged on the front side, the rear side, the left side and the right side of the base 1 respectively, positive and negative magnets 3 are fixedly arranged in the middle of the inner side walls of the vertical rods 2 on the left side and the right side of the base 1 respectively, a ring sleeve 4 is arranged on the top of the base 1, the ring sleeve 4 is connected with the base 1 through an inverted L-shaped connecting rod 26, a splicing ring sleeve 5 is arranged in the middle of the inner circle of the ring sleeve 4, the splicing ring sleeve 5 is formed by 2 n fan-ring blocks 6 in a surrounding mode, n is a positive integer larger than one, a first circular through hole 7 in the vertical direction is formed in the middle of each fan-ring block 6, semicircular grooves 8 in the vertical direction are formed in the adjacent surfaces of the adjacent fan-ring blocks 6, a vertical insulating shaft 9 is sleeved in the middle of the splicing ring sleeve 5, the side surface of the, the inner side of the circular ring sleeve 3 is symmetrically provided with a pair of carbon brushes 10 in a circle center manner, the carbon brushes 10 are in contact fit with the outer side wall of the splicing ring sleeve 4, the tops of all vertical rods 2 are fixedly provided with a same horizontal circular plate 11, the middle part of the circular plate 11 is provided with a second circular through hole 12, the top surface of the circular plate 11 is stacked with a plurality of paper sheets 13 with center opened circular holes, the top of an insulating rod 9 passes through the second circular through hole 12 and is fixedly provided with a square block 21, a cylindrical block 14 is arranged above the square block 21, the bottom of the cylindrical block 14 is provided with a square blind hole 22 corresponding to the square block 21, the square blind hole 22 is spliced and matched with the square block 21, the side surface of the cylindrical block 14 is fixedly provided with a first elastic telescopic rod 15 with a movable rod facing outwards, a shaft sleeve 16 is fixedly arranged on the movable rod of the first elastic telescopic rod 15, the lower side surface of the shaft, the tip of the pen 18 presses on the paper 13; the conductor blocks 19 can be inserted into the semicircular grooves 8 of the adjacent surfaces of the adjacent sector ring blocks 6; the winding device also comprises a plurality of winding coils 20, and lower joints of the winding coils 20 can be inserted into the first symmetrical circular through holes 7 or the semicircular grooves 8 along the central axis of the plug-in ring sleeve 5. When the device is used for experiments, the comparative experiments can be carried out by winding coils with m groups, wherein m is a positive integer less than or equal to n, for example: when a single-group winding coil experiment is selected, firstly, 2 n fan-ring blocks 6 are equally divided into two equal parts, each fan-ring block 6 is adjacent, all the first circular through holes 7 and two semicircular grooves 8 on adjacent surfaces of the adjacent fan-ring blocks 6 are regarded as a splicing unit, lower joints of a single-group winding coil 20 are respectively inserted into the middle splicing unit of each equal fan-ring block 6, and then a conductor block 19 is inserted into the semicircular groove 8 of the adjacent surface of the adjacent fan-ring block 6 in each equal part; similarly, when m groups of winding coils are selected for an experiment, 2 n fan-ring blocks 6 are equally divided into m equal parts, each fan-ring block 6 is adjacent, all the first circular through holes 7 and the two semicircular grooves 8 on the adjacent surfaces of the adjacent fan-ring blocks 6 are regarded as an insertion unit, the lower joints of the m groups of winding coils 20 are respectively inserted into the innermost insertion unit of each equal sector-ring block 6, the conductor blocks 19 are inserted into the semicircular grooves 8 in each equal sector-ring block 6, if the semicircular grooves 8 do not exist in each equal sector-ring block 6, the carbon brushes 10 are respectively communicated with the positive electrode and the negative electrode of a power supply, so that the winding coils 20 are electrified and are subjected to the action of Lorentz force in the magnetic fields of the positive and negative electrodes of the magnets 3 to rotate, and the insertion ring sleeve 5, the insulating shaft 9, the cylindrical blocks 14, the square blocks 21 and the first elastic telescopic rods 15, The shaft sleeve 16, the second elastic telescopic rod 17 and the pen 18 all rotate along with the winding coil 20, because the winding coil 20 is subjected to the lorentz force with constant direction and magnitude in an isomagnetic field after being electrified with constant current, the lorentz force is decomposed, one component of the force is the force along the moving direction, an included angle between a plane where the winding coil 20 is located and the direction of the magnetic field is continuously changed along with the rotation of the winding coil 20, the component of the lorentz force, which is subjected to the winding coil 20, in the moving direction of the winding coil 20 is continuously reduced until the plane where the winding coil 20 is located is perpendicular to the magnetic field, the component of the lorentz force, which is subjected to the moving direction of the winding coil 20, is reduced to zero, the rotating speed of the winding coil 20 is continuously changed under the influence of stress, the movable rod of the first elastic telescopic rod 15 is subjected to different centrifugal forces along with the change of the rotating speed, the rotating speed is faster, the centrifugal, the movable rod of the second elastic telescopic rod 17 supports the pen point of the pen 18 on the paper 13 under the elastic action, the pen 18 rotating around the insulating shaft 9 can draw a plurality of connected wavy lines on the paper 13, the farther the distance between a point on the wavy line and a central circular hole of the paper 13 is, the larger the rotating speed of the winding coil 20 at the corresponding position is, the more the two wavy lines drawn when a single group of winding coils 20 are inserted are close to an ellipse, and two wave crests are provided, as shown in fig. 7; the more the winding coils 20 are inserted, the shorter the single-section wavy line is drawn and the denser the overall distribution is, the 2 m wave crests exist, and the shape is closer to a circle, as shown in fig. 8; the invention has skillful structure and reasonable design, clearly presents the phenomenon that the component force of the Lorentz force applied to the direct current motor along the motion direction is zero when a single group of winding coils rotate to be vertical to a magnetic field to an experimenter in a stroke mode by taking the rotating speed and the centrifugal force as media, and also provides a flexible and variable splicing ring sleeve 5 structure, the more the number of the sections of the wave of a complete closed line drawn by the pen proves that the more the output torque of the insulating shaft is continuous and stable, and can deduce that the output torque of the insulating shaft is in a continuous and stable state when the complete closed wave line is close to a circle, and students can better understand the relationship between the torque output stability of the direct current motor and the number of the winding coils through the comparison experiment of different numbers of winding coils 20, the invention can complete the comparison experiment of the operation of different groups of winding coils by one set of device, the Lorentz force experiment and the torque output stability of the winding coils with different numbers of the direct current motors are ingeniously combined, so that the experiment device is convenient for an experimenter to operate and observe, and the experiment result is convenient to present for the experimenter.

Specifically, as shown in the figure, the middle portions of the inner side walls of the left and right sides of the circular sleeve 4 in this embodiment are both provided with third guiding through holes 23, each of the third guiding through holes 23 is internally provided with a trapezoidal slider 24, the outer side walls of the trapezoidal slider 24 are T-shaped inclined planes with the upper portions inclined to the axis of the circular sleeve 4, the inner side walls of the trapezoidal slider 24 are both fixedly connected with the outer side walls of the corresponding carbon brush 10, the outer side walls of the left and right sides of the circular sleeve 4 are both provided with first sliding grooves 25 along the up-down direction, the left and right sides of the top of the base 1 are both provided with inverted L-shaped connecting rods 26 symmetrical along the central axis of the circular sleeve 4, the lower ends of the vertical rods of the inverted L-shaped connecting rods 26 are both fixedly connected with the base 1, the inner sides of the horizontal rods of the inverted L-shaped connecting rods 26 are both provided with second sliding grooves 27, the inner side, the outer side surface of the trapezoidal sliding block 24 is matched and installed with the T-shaped groove 28, the inner side wall of the cross rod of the inverted L-shaped connecting rod 26 is in contact fit with the outer side wall of the first sliding groove 25, and the inner side of the top of the cross rod of the inverted L-shaped connecting rod 26 is connected with the top of the corresponding first sliding groove 25 through a spring 29. When using the device to carry out the experiment, press the ring cover 4 downwards, trapezoidal slider 24 downstream, because the limiting displacement of T shape recess 28, trapezoidal slider 24 can move to the outside along with T shape recess 28, thereby carbon brush 10 breaks away from grafting ring cover 5 along with trapezoidal slider 24 moves to the outside, play the outage effect at any time, be convenient for change conductor block 19 and winding coil 20, loosen ring cover 24 after the change is accomplished, ring cover 24 resets under the effect of spring 29, so that the circular telegram continues the experiment.

Specifically, as shown in the drawings, the winding coil 20 according to the present embodiment has a main body that is symmetrical along the central axis of the plug-in ring 5. When rotating, the force that makes winding coil 20 both sides receive is the same, has the effect of preventing buckling to winding coil 20, still has the effect of being convenient for accurately obtain the experimental result.

Further, as shown in the figure, the winding coil 20 described in this embodiment includes a circular plug 201, a hard C-shaped wire 202, and an annular ring 203, the circular plugs 201 located on the left and right sides of the bottom of the winding coil 20 can be inserted into the first circular through holes 7 or the semicircular grooves 8 symmetrical along the central axis of the insulating shaft 9, the tops of the circular plugs 201 are fixedly connected to the bottoms of the C-shaped wires 202 on the left and right sides, respectively, the tops of the C-shaped wires 202 are fixedly connected to the left and right sides of the annular ring 203, the annular ring 203 is made of a conductor material, the outer side wall of the annular ring 203 is subjected to insulation treatment, and the middle part of the insulating rod 9 penetrates through the annular ring 203 in the. Winding coil 20 constitutes electrically conductive return circuit, can produce the lorentz force in the magnetic field after the circular telegram, and circular plug 201 can adapt in the first circular through-hole 7 or two semicircular groove 8, and difficult not hard up after inserting drops, and conductor part can not contact electrically when annular ring 203 of multiunit winding coil 20 superposes when annular ring 203 lateral wall insulation treatment can make, and insulator spindle 9 passes annular ring 203 can also provide the guide effect for winding coil 20.

Furthermore, as shown in the figure, the conductor block 19 according to the embodiment includes a cylindrical block 191, a connecting piece 192, and a pull ring 193, the connecting piece 192 is symmetrically and fixedly mounted on the side of the cylindrical block 191, and the pull ring 193 is fixedly connected to the top of the cylindrical block 191. The side wall of the cylindrical block 191 can be in contact fit with the side wall of the semicircular groove 8 on the adjacent surface of the adjacent sector ring block 6, so that the plugging is stable, the connecting sheet 192 can be matched with the gap between the adjacent sector ring blocks 6, the conductor block 19 is not easy to loosen and fall off in the rotating process of the plugging ring sleeve 5, and the pull ring 193 is convenient for an experimenter to insert or take out the conductor block 19.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A rotating magnetic field experimental device is characterized in that: comprises a base (1), wherein vertical rods (2) are respectively and fixedly arranged on the front side, the rear side, the left side and the right side of the base (1), positive and negative magnets (3) are respectively and fixedly arranged in the middle of the inner side wall of each vertical rod (2) on the left side and the right side of the base (1), a circular ring sleeve (4) is arranged at the top of the base (1), the circular ring sleeve (4) is connected with the base (1) through an inverted L-shaped connecting rod (26), a splicing ring sleeve (5) is arranged in the middle of the inner circle of the circular ring sleeve (4), each splicing ring sleeve (5) is formed by winding 2 n fan ring blocks (6), n is a positive integer larger than one, first circular through holes (7) in the vertical direction are respectively formed in the middle of each fan ring block (6), semicircular grooves (8) in the vertical direction are respectively formed in the adjacent surfaces of the adjacent fan ring blocks (6), a vertical insulating shaft (9) is sleeved in the middle of each splicing ring sleeve, the bottom of an insulating shaft (9) is rotationally connected with the top surface of a base (1), a pair of carbon brushes (10) is symmetrically arranged on the inner side of a circular ring sleeve (3) in a circle center manner, the carbon brushes (10) are in contact fit with the outer side wall of a plug-in ring sleeve (4), the tops of all vertical rods (2) are fixedly provided with a same horizontal circular plate (11), the middle of the circular plate (11) is provided with a second circular through hole (12), the top surface of the circular plate (11) is stacked with a plurality of pieces of paper (13) with a circular hole at the center, the top of the insulating rod (9) passes through the second circular through hole (12) and is fixedly provided with a square block (21), a cylindrical block (14) is arranged above the square block (21), the bottom of the cylindrical block (14) is provided with a square blind hole (22) corresponding to the square block (21), the square blind hole (22) is in plug-in fit with the, a shaft sleeve (16) is fixedly arranged on a movable rod of the first elastic telescopic rod (15), a second elastic telescopic rod (17) with the movable rod facing downwards is fixedly arranged on the lower side surface of the shaft sleeve (16), a pen (18) with a pen point facing downwards is fixedly arranged at the bottom of the movable rod of the second elastic telescopic rod (17), and the pen point of the pen (18) is pressed on the paper (13); the conductor blocks (19) can be inserted into the semicircular grooves (8) of the adjacent surfaces of the adjacent sector ring blocks (6); the winding device also comprises a plurality of winding coils (20), and the lower joints of the winding coils (20) can be inserted into the first circular through holes (7) or the semicircular grooves (8) which are symmetrical along the central axis of the inserting ring sleeve (5).

2. The rotating magnetic field experimental device according to claim 1, wherein: third guide through holes (23) are formed in the middle of the inner side wall of the left side and the right side of the annular sleeve (4), trapezoidal sliding blocks (24) are arranged in the third guide through holes (23), the outer side walls of the trapezoidal sliding blocks (24) are T-shaped inclined planes with the upper portions inclined to the axis of the annular sleeve (4), the inner side walls of the trapezoidal sliding blocks (24) are fixedly connected with the outer side walls of the corresponding carbon brushes (10), first sliding grooves (25) in the vertical direction are formed in the outer side walls of the left side and the right side of the left side of the annular sleeve (4), inverted L-shaped connecting rods (26) symmetrical along the central axis of the annular sleeve (4) are arranged on the left side and the right side of the top of the base (1), the lower ends of vertical rods of the inverted L-shaped connecting rods (26) are fixedly connected with the base (1), second sliding grooves (27) are formed in the inner side faces of transverse rods of the inverted L-shaped connecting rods, t-shaped grooves (28) along the length direction of the inner side face of the second sliding chute (27) are formed in the inner side face of the second sliding chute (27), the outer side face of a trapezoidal sliding block (24) is installed in a matched mode with the T-shaped grooves (28), the inner side wall of a cross rod of an inverted L-shaped connecting rod (26) is matched with the outer side wall of the first sliding chute (25) in a contact mode, and the inner side of the top of the cross rod of the inverted L-shaped connecting rod (26) is connected with the top of the corresponding first sliding chute (25) through a spring (29).

3. The rotating magnetic field experimental device according to claim 1, wherein: the winding coil (20) main body is symmetrical along the central axis of the plug-in ring sleeve (5).

4. The rotating magnetic field experimental device according to claim 1, wherein: winding coil (20) including circular plug (201), C font wire (202), annular ring (203) of stereoplasm, be located winding coil (20) bottom left and right sides circular plug (201) can insert respectively in first circular through-hole (7) or semi-circular recess (8) along the central axis symmetry of insulating axle (9), circular plug (201) top respectively with the C font wire (202) bottom fixed connection of the left and right sides, C font wire (202) top respectively with annular ring (203) left and right sides fixed connection, annular ring (203) are the conductor material, and annular ring (203) lateral wall all is insulation treatment, annular ring (203) at winding coil (20) top middle part is passed in insulator spindle (9) middle part.

5. The rotating magnetic field experimental device according to claim 1, wherein: the conductor block (19) comprises a cylindrical block (191), a connecting sheet (192) and a pull ring (193), the connecting sheet (192) is symmetrically and fixedly installed on the side face of the cylindrical block (191), and the pull ring (193) is fixedly connected to the top of the cylindrical block (191).