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

Abstract

The utility model discloses a demonstration device for quantitatively exploring ampere force, wherein an ammeter, an adjustable power supply, an electromagnet, a support frame, an electrified coil and a miniature electronic scale are arranged on a 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 value of the current 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 electrified 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 positioning the energizing coil in the working gap; the trackable direct-current stable power supply is electrically connected with the electrified coil. The utility model quantitatively explores ampere force by utilizing the radial magnetic field, has simpler structure and convenient and visual operation, and can effectively solve the problems in the prior art.

Description

Demonstration device for quantitatively exploring 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 force by using a radial magnetic field.

Background

The circular coils are sleeved in the radial permanent magnet grooves, and magnetic induction lines of the magnetic field are uniformly distributed along the radial direction, so that the formed magnetic field is called as a radial magnetic field. The radial magnetic field is characterized in that: the magnetic induction intensity at the equal 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 is the radial magnetic field of the form N-S, N-S or S-N, S-N shown in FIG. 1, and the other is the radial magnetic field of the form N-S, S-N or S-N, N-S shown in FIG. 2.

Depending on the nature of the radial magnetic field, if an energized coil is placed in the radial magnetic field as shown in FIG. 1. The energized coil is subjected to a torsional amperage, particularly in electromagnetic instruments. If an energized coil is placed in the radial magnetic field shown in fig. 2, the energized coil will be subjected to a pulling ampere force, particularly in electrodynamic speakers.

The ampere force is: in a uniform magnetic field, when the energized conductor is perpendicular to the direction of the magnetic field, the ampere force F exerted on the current is equal to the product of the magnetic induction intensity B, the current I and the length L of the energized part of the conductor. In the radial magnetic field shown in fig. 2, the magnetic induction intensity at the equidistant position from the axis is equal, which is equivalent to a uniform magnetic field, and the energized coil generates push-pull ampere force in the magnetic field, so that the ampere force can be easily and quantitatively detected by us, but no demonstration device for quantitatively detecting the ampere force by using the radial magnetic field exists at present. Therefore, a demonstration device for quantitatively exploring ampere force is manufactured by utilizing the radial magnetic field, the structure is simpler, and the operation is more convenient and visual; the device is used for demonstrating in teaching, so that students can intuitively understand ampere force, and the teaching quality is improved.

Disclosure of Invention

The utility model aims to solve the defects of the prior art, and provides a demonstration device for quantitatively exploring ampere force, which is simpler in structure, more convenient and visual to operate and capable of enabling students to understand ampere force more intuitively in teaching by utilizing a radial magnetic field to quantitatively explore ampere force, thereby being beneficial to improving teaching quality and being capable of effectively solving the problems in the prior art.

The utility model is realized by the following technical scheme:

a demonstration device for quantitatively exploring ampere force comprises a workbench and a trackable direct-current stable power supply, wherein an ammeter, an adjustable power supply, an electromagnet, a support frame, a power-on 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.

Further, according to the demonstration device for quantitatively exploring ampere force, 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.

Further, according to the presentation device for quantitatively exploring ampere force of the present utility model, the thickness of the upper cover plate is larger than the height of the energizing coil, and the energizing coil is located within the thickness range of the upper cover plate when the energizing coil is suspended in the working gap.

Further, according to the demonstration device for quantitatively exploring ampere force, 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.

Further, according to the demonstration device for quantitatively exploring ampere force, 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 potentiometer and the resistor 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.

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

Further, according to the presentation device for quantitatively exploring ampere force, the energizing coil comprises four contact heads, namely a starting end contact head, a coil five-turn withdrawing contact head, a coil ten-turn withdrawing contact head and a coil fifteen-turn withdrawing contact head, wherein the trackable direct-current stable power supply is electrically connected with the starting end contact head on the energizing coil through one connecting wire, and is electrically connected with the coil five-turn withdrawing contact head or the coil ten-turn withdrawing contact head or the coil fifteen-turn withdrawing contact head through the other connecting wire.

Furthermore, according to the demonstration device for quantitatively exploring ampere force, 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.

Further, according to the demonstration device for quantitatively exploring ampere force, the change-over switch is arranged on the supporting frame.

Further, according to the demonstration device for quantitatively exploring ampere force, the weighing end of the miniature electronic scale is provided with the mounting plate, and at least two hanging pieces are arranged on the mounting plate and used for hanging the electrified coil.

Compared with the prior art, the utility model has the beneficial effects that: the ampere force is quantitatively explored by utilizing the radial magnetic field, the structure is simpler, the operation is more convenient and visual, the ampere force can be more intuitively understood by students through the device in teaching, the teaching quality is improved, and the problems in the prior art can be effectively solved.

Drawings

FIG. 1 shows the radial magnetic field of the N-S, N-S or S-N, S-N form of the background art.

FIG. 2 shows the radial magnetic field of the N-S, S-N or S-N, N-S form of the prior art.

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

Fig. 4 is an exploded view of an electromagnet according to the present utility model.

Fig. 5 is an electrical schematic diagram of the present utility model between an adjustable power supply, an electromagnet, an ammeter, a relay, a work switch, and a switching power supply.

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

Fig. 7 is an enlarged view of the structure of the support frame portion of fig. 6.

Fig. 8 is a circuit diagram of a commercially available dc output 12V20A switching power supply.

In the figure:

the transformer comprises a workbench 1, an ammeter 11, an adjustable power supply 12, an electromagnet 13, an iron core 131, a first coil 132, a framework 133, a lower cover plate 1331, an upper cover plate 1332, a connecting pipe 1333, a support frame 14, an energizing coil 15, a starting end contact 151, a coil five-turn extraction contact 152, a coil ten-turn extraction contact 153, a coil fifteen-turn extraction contact 154, a miniature electronic scale 16, a mounting plate 161, a hanging piece 1611, a relay 17, a switching power supply 18, a working switch 19, a trackable direct-current stable power supply 2, a sink 3, a working gap 4 and a change-over switch 5.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-7, the present utility model provides a technical solution:

a demonstration device for quantitatively exploring ampere force comprises a workbench 1 and a trackable direct-current stable power supply 2, wherein an ammeter 11, an adjustable power supply 12, an electromagnet 13, a support frame 14, an electrified coil 15 and a miniature electronic scale 16 are arranged on the workbench 1; the adjustable power supply 12 is electrically connected with the electromagnet 13 and is used for supplying power to the electromagnet 13 to form a radial magnetic field; the ammeter 11 is used for measuring the current value flowing in the electromagnet 13; the electromagnet 13 comprises an iron core 131 and a framework 133 with a first coil 132 wound on the outer side surface, a sinking groove 3 is arranged in the middle of the framework 133, the iron core 131 is arranged in the middle of the sinking groove 3, and a working gap 4 is arranged between the iron core 131 and the sinking groove; the miniature electronic scale 16 is arranged on the supporting frame 14, and the supporting frame 14 is used for supporting the miniature electronic scale 16 above the electromagnet 13; the energizing coil 15 is hung on a mounting plate 161 arranged on the top of the miniature electronic scale 16, and the hung energizing coil 15 is positioned in the working gap 4; the trackable direct current stabilized power supply 2 is electrically connected with 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, comprising a potentiometer and a resistor, and the potentiometer is connected in parallel with the resistor. In this embodiment, in order to save cost, the adjustable power supply 12 is formed by modifying a dc output 12V20A switching power supply purchased in the market, as shown in fig. 8, which is a circuit diagram of the purchased dc output 12V20A switching power supply, and mainly includes a fuse FU, a rectifier bridge D1-D4, a transformer T, switching transistors G1, UC3842, a trimming resistor W1, a plurality of resistors, a plurality of diodes and a plurality of capacitors, wherein the trimming resistor W1 is used for adjusting voltage, and it should be noted that only the trimming resistor W1 needs to be removed, and a 10K potentiometer is connected in parallel with a 2K resistor to the position of the trimming resistor W1, so as to obtain the 9-18V adjustable power supply. In addition, the electromagnet 13 is specifically manufactured by firstly manufacturing a skeleton 133, wherein the skeleton 133 comprises a lower cover plate 1331, an upper cover plate 1332 and a connecting pipe 1333, the lower cover plate 1331 and the upper cover plate 1332 are both made of iron plates and are in a circular structure, the lower cover plate 1331 is fixed at the lower end of the connecting pipe 1333, the upper cover plate 1332 is fixed at the upper end of the connecting pipe 1333, and the lower cover plate 1331, the upper cover plate 1332 and the connecting pipe 1333 are coaxial; a through hole is formed in the middle of the upper cover plate 1332, the connecting pipe 1333 and the lower cover plate 1331 form a sink 3 through the through hole, the iron core 131 is fixed in the middle of the sink 3, and a working gap 4 is formed between the upper cover plate 1332 and the lower cover plate 1331; the first coil 132 is formed by winding 2 kg of enamel wire with the diameter of 1.5mm on the connecting pipe 1333 layer by layer in a flat way; for the sake of beautiful appearance, the upper cover plate 1332 and the lower cover plate 1331 may be wrapped by insulating paper, thus completing the manufacture of the electromagnet 13. The support frame 14 is made of a plastic plate, the support frame 14 is placed on the upper cover plate 1332 on the top of the electromagnet 13, the micro electronic scale 16 is fixed on the top of the support frame 14 and is supported right above the sink 3 through the support frame 14, the mounting plate 161 is arranged on the top of the micro electronic scale 16, and in order to prevent the mounting plate 161 from falling off the micro electronic scale 16, the mounting plate 161 can be adhered on the top of the micro electronic scale 16 through glue; in addition, in order to facilitate hanging the energizing coil 15, at least two hanging pieces 1611 are provided on the mounting plate 161, and the hanging pieces 1611 are used for hanging the energizing coil 15 below the mounting plate 161; when the support frame 14 is placed on top of the electromagnet 13, the suspended energizing coil 15 is located in the working gap 4; the energizing coil 15 is tightly wound on a circular tube by adopting an enameled wire with the diameter of 0.96mm for a set number of turns, then the coil is fixed by glue, and the tire is removed, wherein the obtained energizing coil 15 has an inner diameter larger than that of a connecting pipe 1333 wound with a first coil 132, and the outer diameter of the energizing coil 15 is smaller than that of a sinking groove 3, so that the energizing coil 15 is conveniently inserted into a working gap 4; the trackable direct current stabilized power supply 2 adopts SS series trackable direct current stabilized power supply, preferably SS1792F trackable direct current stabilized power supply, and is convenient for adjusting output current to obtain ampere force with different intensities.

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

Further, in order to facilitate the test demonstration of the energizing wires with different lengths, the energizing coil 15 comprises four contact heads, namely a starting end contact head 151, a coil five-turn extraction contact head 152, a coil ten-turn extraction contact head 153 and a coil fifteen-turn extraction contact head 154; the trackable direct-current stable power supply 2 is electrically connected with the initial end contact 151 on the energizing coil 15 through one connecting wire, and is electrically connected with the extraction contact 152 at five turns of the coil or the extraction contact 153 at ten turns of the coil or the extraction contact 154 at fifteen turns of the coil on the energizing coil 15 through the other connecting wire, so that the trackable direct-current stable power supply 2 is electrically connected with the energizing coils 15 with different turns of the coil, and the requirement of test demonstration on energizing wires with different lengths is met.

Further, in order to facilitate switching between the energizing wires with different lengths, a change-over switch 5 is further provided between the energizing coil 15 and the trackable direct current stable power supply 2, and the change-over switch 5 is used for switching the number of turns of the coil electrically connected between the energizing coil 15 and the trackable direct current stable power supply 2; the change-over switch 5 is used for switching, so that manual replacement connection is avoided, and test time is saved. In this embodiment, the change-over switch 5 is detachably arranged on the support frame 14.

Further, the workbench 1 is also provided with a relay 17, a switching power supply 18 and a working switch 19, wherein the relay 17 is a relay with two paths of contacts, the switching power supply 18 is electrically connected with the relay 17 and is used for supplying power to the relay 17, and the working switch 19 is used for controlling the connection relation between the switching power supply 18 and the relay 17; the adjustable power supply 12 and the electromagnet 13 are switched by a relay 17 to change the inner and outer magnetic poles of the electromagnet 13. In the embodiment, the switching power supply 18 adopts a direct current 12V switching power supply and is arranged in a groove arranged at the bottom of the workbench 1, and the switching power supply 18 is sunk in the groove, so that the unstable placement caused by the contact of the switching power supply 18 and a placement surface when the workbench 1 is placed is avoided; the switch power supply 18 is also electrically connected with the ammeter 11 and is used for supplying power to the ammeter 11; when the inner and outer poles of the electromagnet 13 need to be changed, the working switch 19 is turned on, and the switching power supply 18 is connected with the relay 17.

During demonstration, the trackable direct-current stable power supply 2 and the adjustable power supply 12 are respectively connected with an external power supply, the trackable direct-current stable power supply 2 and the adjustable power supply 12 are supplied with power by the external power supply, the electromagnet 13 works to form a radial magnetic field, the electrified coils 15 with different coil turns are switched and selected through the change-over switch 5 to be electrically connected with the trackable direct-current stable power supply 2, and the obtained experimental data are shown in a table I and a table II:

in addition, the working switch 19 can be turned on to switch on the switch power supply 18 and the relay 17, so that the internal and external magnetic poles of the electromagnet 13 are changed, and the students can see that the polarity of the magnetic field is reversed, the direction of current in the electrified conductor is changed, and the direction of ampere force is also changed to be reversed, so that the obtained experimental data are the same as those of the first meter and the second meter, and are not described at this time.

Data analysis: the magnetic induction intensity and the length of the lead are fixed, the current of the lead is increased by times, and the ampere force is also increased by times; the magnetic induction intensity and the wire current are certain, the length of the wire is multiplied, and the ampere force is multiplied; the first and second meters show that the length and current of the wires are certain, and the ampere force is correspondingly doubled when the magnetic induction intensity is doubled. The magnitude of the ampere force applied to the energized conductor in the magnetic field is proportional to the magnetic induction intensity; proportional to the current flowing through the wire; proportional to the length of the wire in the magnetic field (i.e., f=ibl).

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in 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.