CN219609855U - Demonstration device for quantitatively exploring ampere force - Google Patents

Abstract

The utility model discloses a demonstration device for quantitatively exploring the ampere force. The workbench is provided with an ammeter, an adjustable power supply, an electromagnet, a support frame, a energized coil and a miniature electronic scale; the adjustable power supply is electrically connected with the electromagnet, and the It is used to supply power to the electromagnet to form a radial magnetic field; the ammeter is used to measure the current value flowing in the electromagnet; the electromagnet includes an iron core and a skeleton with a first coil wound on the outer surface. In the middle of the sinking tank, and there is a working gap between the two; the micro electronic scale is set on the support frame, the energized coil is suspended on the weighing end of the micro electronic scale, and the support frame is used to support the micro electronic scale above the electromagnet ; and the energized coil is located in the working gap; the DC stable power supply can be tracked and electrically connected to the energized coil. The utility model uses the radial magnetic field to quantitatively explore the Ampere force, has a simpler structure, is convenient and intuitive to operate, and can effectively solve the problems existing in the prior art.

Description

A Demonstration Device for Quantitative Exploration of Ampere Force

technical field

The utility model relates to the technical field of demonstration teaching aids, in particular to a demonstration device for quantitatively exploring Ampere's force, in particular to a demonstration device for quantitatively exploring Ampere's force by using a radial magnetic field.

Background technique

The circular coil is set in the radial permanent magnet slot, and the magnetic induction lines of the magnetic field are uniformly distributed along the radial direction, and the magnetic field formed at this time is called the radial magnetic field. The characteristics of the radial magnetic field are: the magnitude of the magnetic induction intensity at an equidistant distance from the axis is always equal, and the magnetic induction lines are always uniformly distributed along the axial direction; it has two forms, one of which is N— as shown in Figure 1 The radial magnetic field in the form of S, N—S or S—N, S—N, and the other is the radial magnetic field in the form of N—S, S—N or S—N, N—S shown in Figure 2.

According to the characteristics of the radial magnetic field, if a energized coil is placed in the radial magnetic field shown in Figure 1. Then the energized coil will be subjected to a torsional ampere force, and the specific application is such as in an electromagnetic instrument. If a energized coil is placed in the radial magnetic field shown in Figure 2, the energized coil will be subjected to a push-pull ampere force, which is specifically applied in an electrodynamic speaker.

Ampere's force is: in a uniform magnetic field, when the energized wire is perpendicular to the direction of the magnetic field, the Ampere's force F on the current is equal to the product of the magnetic induction B, the current I and the length L of the wire's electrified part. In the radial magnetic field shown in Figure 2, the magnetic induction intensity at the equidistant distance from the axis is equal, which is equivalent to a uniform magnetic field. The energized coil generates push-pull Ampere force in the magnetic field, which is relatively easy for us to quantitatively explore the Ampere force. However, there is no demonstration device for quantitative exploration of Ampere's force using radial magnetic fields. Therefore, we use the radial magnetic field to make a demonstration device for quantitatively exploring the Ampere force. The structure is simpler, and the operation is more convenient and intuitive; the demonstration of this device in teaching can enable students to understand the Ampere force more intuitively. Help improve the quality of teaching.

Utility model content

The purpose of this utility model is to solve the deficiencies of the prior art, and provide a demonstration device for quantitatively exploring the Ampere force, using the radial magnetic field to quantitatively explore the Ampere force, the structure is simpler, the operation is more convenient and intuitive, and it can be used in teaching through this Demonstration of the device can enable students to understand the Ampere force more intuitively, help to improve the quality of teaching, and thus effectively solve the problems existing in the prior art.

The utility model is realized through the following technical solutions:

A demonstration device for quantitatively exploring the Ampere force, comprising a workbench and a trackable DC stable power supply, the workbench is provided with an ammeter, an adjustable power supply, an electromagnet, a support frame, an energized coil and a miniature electronic scale; the adjustable The power supply is electrically connected to the electromagnet, and is used to supply power to the electromagnet to form a radial magnetic field; the ammeter is used to measure the current value flowing through the electromagnet; the electromagnet includes an iron core and an outer surface wound There is a skeleton of the first coil, a sinker is arranged in the middle of the skeleton, the iron core is arranged in the middle of the sinker, and a working gap is arranged between the two; the miniature electronic scale is arranged on the support On the frame, the energized coil is suspended on the weighing end of the miniature electronic scale, and the support frame is used to support the miniature electronic scale above the electromagnet, and make the energized coil be located at the working In the gap; the trackable DC stable power supply is electrically connected to the energized coil for supplying power to the energized coil.

Further, according to the demonstration device for quantitatively exploring the ampere force of the present invention, the skeleton includes a lower cover plate, an upper cover plate and a connecting pipe, and both the lower cover plate and the upper cover plate are made of iron plates and are circular structure, the lower cover plate is fixed on the lower end of the connecting pipe, the upper cover plate is fixed on the upper end of the connecting pipe, and the three are coaxial; a through hole is arranged in the middle of the upper cover plate, and the The sinker is formed by the upper cover plate through the through hole, the connecting pipe and the lower cover plate.

Further, according to the demonstration device for quantitatively exploring the ampere force of the present invention, the thickness of the upper cover plate is greater than the height of the energized coil, and when the energized coil is suspended in the working gap, the energized coil is located at the Within the thickness range of the above cover plate.

Further, according to the demonstration device for quantitatively exploring the ampere force of the present invention, a relay, a switching power supply, and a working switch are also arranged on the workbench, the relay is a relay of two-way contacts, and the switching power supply and the relay are electrically connection, used to supply power to the relay, and the working switch is used to control the connection relationship between the switching power supply and the relay; the adjustable power supply and the electromagnet are switched through the relay to change The inner and outer magnetic poles of the electromagnet.

Further, according to the demonstration device for quantitatively exploring the ampere force of the present utility model, the adjustable power supply is a 9-18V adjustable power supply, including a potentiometer and a resistor, the potentiometer is a 10K potentiometer, and the resistor is a 2K resistor, And the two are connected in parallel; the trackable DC stable power supply is an SS series trackable DC stable power supply; the switching power supply is a DC 12V switching power supply.

Further, according to the demonstration device for quantitatively exploring ampere force of the present invention, the ammeter is electrically connected to the switching power supply, and the switching power supply is used to supply power to the ammeter.

Further, according to the demonstration device for quantitatively exploring the ampere force of the present invention, the energized coil includes four contacts, which are the contact at the starting end, the contact at the fifth turn of the coil, the contact at the tenth turn of the coil, and the contact at the tenth turn of the coil. The contact head is pulled out at the fifth turn, and the traceable DC stable power supply is electrically connected to the initial contact head on the energized coil through a connecting wire, and is connected to the contact head on the energized coil through another connecting wire. The contact head extracted from the fifth turn of the coil or the contact head drawn from the tenth turn of the coil or the contact head drawn from the fifteenth turn of the coil is electrically connected.

Further, according to the demonstration device for quantitatively exploring the ampere force of the present invention, there is also a transfer switch between the energized coil and the trackable DC stable power supply, and the transfer switch is used to switch between the energized coil and the trackable DC power supply. Tracks the number of turns of a coil electrically connected to a DC stabilized power supply.

Further, according to the demonstration device for quantitatively exploring the Ampere force of the present invention, the transfer switch is arranged on the support frame.

Further, according to the demonstration device for quantitatively exploring the Ampere force of the present invention, the weighing end of the miniature electronic scale is provided with a mounting plate, and the mounting plate is provided with at least two suspension parts, and the suspension parts are used for hanging the energized coil.

Compared with the prior art, the beneficial effect of the utility model is that: using the radial magnetic field to quantitatively explore the Ampere force, the structure is simpler, the operation is more convenient and intuitive, and the demonstration of the device in the teaching can make the students more intuitive Understanding Ampere Force is helpful to improve the quality of teaching, so as to effectively solve the problems existing in the existing technology.

Description of drawings

Fig. 1 is the radial magnetic field in the form of N—S, N—S or S—N, S—N in the background technology.

Fig. 2 is the radial magnetic field in the form of N—S, S—N or S—N, N—S in the background technology.

Fig. 3 is a front view of the utility model.

Fig. 4 is an exploded view of the electromagnet in the utility model.

Fig. 5 is the electrical schematic diagram among adjustable power supply, electromagnet, ammeter, relay, working switch and switching power supply in the utility model.

Fig. 6 is a perspective view of the utility model.

FIG. 7 is an enlarged view of the structure of the support frame in FIG. 6 .

Figure 8 is a circuit diagram of a DC output 12V20A switching power supply purchased in the market.

In the picture:

Workbench 1, ammeter 11, adjustable power supply 12, electromagnet 13, iron core 131, first coil 132, skeleton 133, lower cover 1331, upper cover 1332, connecting pipe 1333, support frame 14, energized coil 15, The contact head 151 at the starting end, the contact head 152 is drawn out at the fifth turn of the coil, the contact head 153 is drawn out at the tenth turn of the coil, the contact head 154 is drawn out at the fifteenth turn of the coil, the miniature electronic scale 16, the mounting plate 161, the suspension 1611, the relay 17, Switching power supply 18, working switch 19, trackable DC stable power supply 2, sinking tank 3, working gap 4, transfer switch 5.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Please refer to Figure 1-7, the utility model provides a technical solution:

A demonstration device for quantitatively exploring the Ampere force, including a workbench 1 and a trackable DC stable power supply 2. The workbench 1 is provided with an ammeter 11, an adjustable power supply 12, an electromagnet 13, a support frame 14, an energized coil 15 and microelectronics. Scale 16; Adjustable power supply 12 is electrically connected with electromagnet 13, is used for forming radial magnetic field to electromagnet 13 power supply; Ammeter 11 is used for measuring the electric current value that flows through in electromagnet 13; Electromagnet 13 comprises iron core 131 and outer The side is wound with the skeleton 133 of the first coil 132, the center of the skeleton 133 is provided with a sinker 3, the iron core 131 is arranged in the middle of the sinker 3, and a working gap 4 is provided between the two; the miniature electronic scale 16 is arranged on On the support frame 14, the support frame 14 is used to support the miniature electronic scale 16 above the electromagnet 13; the energized coil 15 is suspended on the mounting plate 161 that is provided with on the top of the miniature electronic scale 16, and the suspended energized coil 15 is located at the working position. In the gap 4 ; the trackable DC stable power supply 2 is electrically connected to the energizing coil 15 for supplying power to the energizing coil 15 . Specifically, the adjustable power supply 12 is a 9-18V adjustable power supply, including a potentiometer and a resistor, and the potentiometer and the resistor are connected in parallel. In this embodiment, in order to save costs, the adjustable power supply 12 is transformed from a DC output 12V20A switching power supply purchased on the market. As shown in Figure 8, the circuit diagram of the purchased DC output 12V20A switching power supply mainly includes a fuse FU, a rectifier bridge D1-D4, transformer T, switch tube G1, UC3842, trimming resistor W1, multiple resistors, multiple diodes and multiple capacitors, trimming resistor W1 is used to adjust the voltage, it should be noted here that only the trimming resistor W1 needs to be removed, And use a 10K potentiometer to connect a 2K resistor in parallel to the position of the trimming resistor W1 to obtain a 9-18V adjustable power supply. In addition, the manufacture of the electromagnet 13 is as follows: first, the skeleton 133 is made, and the skeleton 133 includes a lower cover 1331, an upper cover 1332, and a connecting pipe 1333. Both the lower cover 1331 and the upper cover 1332 are made of iron plates, and It has a circular structure, the lower cover plate 1331 is fixed on the lower end of the connecting pipe 1333, the upper cover plate 1332 is fixed on the upper end of the connecting pipe 1333, and the three are coaxial; the middle of the upper cover plate 1332 is provided with a through hole, and the upper cover plate 1332 The through hole, the connecting pipe 1333 and the lower cover plate 1331 form the sinker 3, the iron core 131 is fixed in the middle of the sinker 3, and a working gap 4 is provided between the two; The enameled wire of mm is wound on the connecting pipe 1333 layer by layer; in order to be beautiful, the upper cover plate 1332 and the lower cover plate 1331 can be wrapped with insulating paper, that is, the production of the electromagnet 13 is completed. The support frame 14 is made of a plastic plate, the support frame 14 is placed on the upper cover plate 1332 at the top of the electromagnet 13, the miniature electronic scale 16 is fixed on the top of the support frame 14, and is supported directly above the sinker 3 by the support frame 14 , the mounting plate 161 is arranged on the top of the miniature electronic scale 16, in order to prevent the mounting plate 161 from falling off from the miniature electronic scale 16, the mounting plate 161 can be fixed on the top of the miniature electronic scale 16 by glue; , the mounting plate 161 is provided with at least two suspensions 1611, the suspensions 1611 are used to suspend the energized coil 15 below the mounting plate 161; when the support frame 14 is placed on the top of the electromagnet 13, the suspended energized coil 15 is located at In the working gap 4; the energized coil 15 is tightly wound on the round tube with a diameter of 0.96mm enameled wire to set the number of turns, and then the coil is fixed with glue. There is a connecting pipe 1333 for the first coil 132, and the outer diameter of the energized coil 15 is smaller than the sinker 3, so that the energized coil 15 can be easily inserted into the working gap 4; the trackable DC stabilized power supply 2 adopts the SS series trackable DC stabilized power supply, preferably SS1792F It can track the DC stable power supply, conveniently adjust the output current, and obtain different ampere forces.

In addition, in order to improve the accuracy of the test demonstration operation, the thickness of the upper cover plate 1332 is greater than the height of the energized coil 15. When the energized coil 15 is suspended in the working gap 4, the energized coil 15 is located within the thickness range of the upper cover plate 1332.

Further, in order to facilitate the test and demonstration of different lengths of energized wires, the energized coil 15 includes four contact heads, which are respectively the starting end contact head 151, the pull-out contact head 152 at the fifth turn of the coil, the pull-out contact head 153 at the tenth turn of the coil, and Pull out the contact head 154 at the 15 turns of the coil; the traceable DC stable power supply 2 is electrically connected to the contact head 151 on the starting end of the energized coil 15 through a connecting wire, and is connected to the upper coil 15 of the energized coil 15 through another connecting wire for five turns Pull out the contact head 152 at 10 turns of the coil or pull out the contact head 153 at the ten turns of the coil or pull out the contact head 154 at the fifteenth turn of the coil for electrical connection, so as to realize the electrical connection between the traceable DC stable power supply 2 and the energized coil 15 with different coil turns, so as to satisfy Demonstration of experiments with live wires of different lengths.

Further, in order to facilitate switching between energized wires of different lengths, a transfer switch 5 is also provided between the energized coil 15 and the trackable DC stable power supply 2, and the transfer switch 5 is used to switch the energized coil 15 and the trackable DC stabilized power supply. The number of turns of the coil electrically connected to the power supply 2 is switched by the changeover switch 5, avoiding manual replacement and connection, and saving test time. In this embodiment, the transfer switch 5 is detachably arranged on the supporting frame 14 .

Further, the workbench 1 is also provided with a relay 17, a switching power supply 18 and an operating switch 19. The relay 17 is a relay with two contacts, and the switching power supply 18 is electrically connected to the relay 17 for supplying power to the relay 17. The operating switch 19 is used to control the connection relationship between the switching power supply 18 and the relay 17; between the adjustable power supply 12 and the electromagnet 13, the relay 17 is used to change the inner and outer magnetic poles of the electromagnet 13. In this embodiment, the switching power supply 18 adopts a DC 12V switching power supply, and is arranged in a groove provided at the bottom of the workbench 1. The switching power supply 18 is sunk in the groove, so as to prevent the switching power supply 18 from contacting the placement surface when the workbench 1 is placed. Cause placed unstable; switching power supply 18 can also be electrically connected with ammeter 11, is used to supply power to ammeter 11;

During the demonstration, connect the trackable DC stabilized power supply 2 and the adjustable power supply 12 to the external power supply respectively, and the external power supply supplies power to the trackable DC stabilized power supply 2 and the adjustable power supply 12. 5 Switch and select the energized coil 15 with different coil turns to be electrically connected to the traceable DC stable power supply 2, and the experimental data obtained are shown in Table 1 and Table 2:

In addition, the working switch 19 can also be turned on, so that the switching power supply 18 and the relay 17 are connected, and the inner and outer magnetic poles of the electromagnet 13 are changed to demonstrate to the students. Here we can see that the polarity of the magnetic field is reversed, and the current in the energized conductor When the direction is changed, the direction of the Ampere's force is also changed to the opposite direction. The obtained experimental data are the same as those in Table 1 and Table 2, so they are not described here.

Data analysis: When the magnetic induction intensity and the length of the wire are fixed, the current of the wire is doubled, and the ampere force is also doubled; if the magnetic induction intensity and the wire current are constant, the length of the wire is doubled, and the ampere force is also doubled; from Table 1 and Table 2 It can be seen that the length of the wire and the current of the wire are constant, the magnetic induction doubles, and the ampere force also doubles accordingly. Therefore, the magnitude of the Ampere force that the current-carrying conductor receives in the magnetic field is proportional to the magnetic induction intensity; it is proportional to the current flowing through the wire; it is proportional to the length of the wire in the magnetic field (that is, F=IBL).

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes and modifications can be made to these embodiments without departing from the principle and spirit of the present invention , replacements and modifications, the scope of the present utility model is defined by the appended claims and their equivalents.

Claims (10)

1. The demonstration device for quantitatively exploring ampere force is characterized by comprising a workbench and a trackable direct-current stable power supply, wherein an ammeter, an adjustable power supply, an electromagnet, a support frame, an electrified coil and a miniature electronic scale are arranged on the workbench; the adjustable power supply is electrically connected with the electromagnet and is used for supplying power to the electromagnet to form a radial magnetic field; the ammeter is used for measuring the current value flowing in the electromagnet; the electromagnet comprises an iron core and a framework, the outer side surface of the framework is wound with a first coil, a sinking groove is formed in the middle of the framework, the iron core is arranged in the middle of the sinking groove, and a working gap is formed between the iron core and the sinking groove; the miniature electronic scale is arranged on the support frame, the energizing coil is hung at the weighing end of the miniature electronic scale, and the support frame is used for supporting the miniature electronic scale above the electromagnet and enabling the energizing coil to be located in the working gap; the trackable direct-current stable power supply is electrically connected with the energizing coil and is used for supplying power to the energizing coil.

2. The demonstration device for quantitatively exploring ampere force according to claim 1, wherein the framework comprises a lower cover plate, an upper cover plate and a connecting pipe, wherein the lower cover plate and the upper cover plate are made of iron plates and are in round structures, the lower cover plate is fixed at the lower end of the connecting pipe, and the upper cover plate is fixed at the upper end of the connecting pipe and is coaxial with the connecting pipe; the middle of the upper cover plate is provided with a through hole, and the upper cover plate forms the sink through the through hole, the connecting pipe and the lower cover plate.

3. The apparatus of claim 2, wherein the upper cover plate has a thickness greater than a height of the energized coil, the energized coil being within a thickness of the upper cover plate when the energized coil suspension is in the working gap.

4. The demonstration device for quantitatively exploring ampere force according to claim 1, wherein the workbench is further provided with a relay, a switching power supply and a working switch, the relay is a relay with two paths of contacts, the switching power supply is electrically connected with the relay and is used for supplying power to the relay, and the working switch is used for controlling the connection relation between the switching power supply and the relay; the adjustable power supply and the electromagnet are switched through the relay and used for changing the inner magnetic pole and the outer magnetic pole of the electromagnet.

5. The demonstration device for quantitatively exploring ampere force according to claim 4, wherein the adjustable power supply is 9-18V adjustable power supply and comprises a potentiometer and a resistor, wherein the potentiometer is a 10K potentiometer, the resistor is a 2K resistor, and the two are connected in parallel; the trackable direct-current stable power supply is an SS series trackable direct-current stable power supply; the switching power supply is a direct-current 12V switching power supply.

6. The apparatus of claim 4, wherein the ammeter is electrically connected to the switching power supply, and the switching power supply is configured to supply power to the ammeter.

7. The apparatus of any one of claims 1-6, wherein the energizing coil comprises four contacts, including a start contact, a five-turn coil pull-out contact, a ten-turn coil pull-out contact, and a fifteen-turn coil pull-out contact, the trackable dc stabilized power supply is electrically connected to the start-end contact on the energizing coil via one connecting wire and to the five-turn coil pull-out contact or the ten-turn coil pull-out contact or the fifteen-turn coil pull-out contact on the energizing coil via another connecting wire.

8. The device for quantitatively exploring the ampere force demonstration according to claim 7, wherein a change-over switch is further arranged between the energizing coil and the trackable direct-current stable power supply, and the change-over switch is used for switching the number of turns of the coil electrically connected with the energizing coil and the trackable direct-current stable power supply.

9. The apparatus of claim 8, wherein the change-over switch is disposed on the support frame.

10. The device for quantitatively exploring an ampere force demonstration according to claim 1, wherein a mounting plate is arranged at a weighing end of the miniature electronic scale, and at least two hanging pieces are arranged on the mounting plate and used for hanging the energizing coil.