CN201707817U - Electromagnetic induction demonstrator - Google Patents
Electromagnetic induction demonstrator Download PDFInfo
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- CN201707817U CN201707817U CN2010201403011U CN201020140301U CN201707817U CN 201707817 U CN201707817 U CN 201707817U CN 2010201403011 U CN2010201403011 U CN 2010201403011U CN 201020140301 U CN201020140301 U CN 201020140301U CN 201707817 U CN201707817 U CN 201707817U
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Abstract
The utility model discloses an electromagnetic induction demonstrator; a bridge rectifier is connected with a filter circuit, and pulse direct current is converted into constant direct current; a resonance circuit and an IGBT are combined in an inverter unit to form oscillation; a synchronizing signal of an oscillation circuit is connected with a comparator to generate common-frequency sawtooth wave which is input to a push-pull circuit by a capacitor, and the output end thereof is connected with the base of the IGBT, thus forming an IGBT driving circuit; and an electromagnetic induction experiment circuit unit constitutes a closed union thimble induction coil by a coil L3 and a voltmeter, and constitutes an inductive circuit with a coil L1. The electromagnetic induction demonstrator provides changed magnetic field source for experimental teaching of 'electromagnetic induction' and 'generation and emission of electromagnetic wave', performs various experiments relevant to 'electromagnetic induction phenomenon', 'law of electromagnetic induction', 'generation and emission of electromagnetic wave' and the like, and leads to simple experiment operation, obvious phenomenon and strong interestingness. A closed circuit in any shapes, formed by bending of any conductors, can generate an inductive current when being close to a magnetic field; and strong inductive current can be generated, with maximum value being 100 amperes. The electromagnetic induction demonstrator also can provide a power supply for electrical equipment with low voltage and large current.
Description
Technical field
The utility model provides a kind of electromagnetic induction demonstration instrument, is used for the physics teaching experiment course, belongs to teaching demonstration instrument technical field.
Background technology
In the senior middle school physics teaching process, for the education experiment content of " electromagnetic induction " often exist that content is abstract, experiment is single, student's indigestibility, particularly induction electromotive force and faradic having problems.Because faradic generation condition is: " change as long as wear the magnetic flux of closed circuit, just have induction current to produce in the closed circuit ".The generation of electric current has two kinds of concrete forms: a kind ofly be to give birth to (being that coil and magnet have relative motion), another kind is induct (being the motionless changes of magnetic field of coil).Just moving the giving birth to that experiment can be done in the teaching at ordinary times, promptly magnetic field and coil have relative motion, coil cutting magnetic field line (be not coil moving be exactly that magnet moves), and not having of inducting, reason is the Magnetic Field Source that can not find a kind of variation.Therefore, often influenced understanding and the study of student to " electromagnetic induction " content of courses.
Summary of the invention
The utility model provides a kind of electromagnetic induction demonstration instrument, solved in the physics teaching ocular demonstration problem about " electromagnetic induction ".
The technical solution of electromagnetic induction demonstration instrument of the present invention is as follows: bridge rectifier BD and filter inductance L
2, capacitor C
2The filtering circuit of forming connects, and pulse direct current is become constant direct current, for inverter circuit provides steady voltage; Low-tension supply by common transformer generation+5V ,+18V voltage; In inversion unit, by inductance L
1, capacitor C
1Resonant circuit that constitutes in parallel and IGBT pipe D form the formation vibration; Inductance L
1, capacitor C
1The synchronizing signal of resonant circuit meets comparer IC
2Produce with frequency sawtooth wave, comparer IC
2Output low level is through capacitor C
4Be input to by triode Q
1, Q
2Form push-pull circuit, make Q
1, Q
2The output high level; The triode Q of two polarity complementations
1, Q
2Output terminal be connected with the base stage of IGBT pipe, formed the IGBT driving circuit;
The electromagnetic induction experiment circuit unit is by coil L
3, voltage table V constitutes the mutual cover induction coil of sealing, with coil L
1Constitute sensor circuit.
Described coil L
3For copper rubber lead and miniature bulb R are linked to be the closed-loop path, the number of turn is respectively 1 circle, 2 circles, 3 circles, 4 circles.
Described coil L
3For copper rubber lead curves diameter 30cm, the number of turn is respectively four coils of 1 circle, 2 circles, 3 circles, 4 circles, and the two ends of coil and plug K connect together by plug K coil L
3Be connected on the voltage table V with socket.
Described coil L3 curves the circular closure coil of two diameter 30CM for the copper rubber covered wire.
During experiment, with the close respectively coil L of above-mentioned coil
1, can realize L
1With L
3Induction, from voltage table V or miniature bulb R see experimental phenomena.
Using method
1, probes into faradic generation condition.
Turn on the power switch, respectively near the circular field region of teaching aid, miniature bulb will be luminous with first group of coil, the magnetic flux change of passing coil is described, in coil, there is induction current to produce, changes, electric current is just arranged in the closing coil so as long as the magnetic flux that passes closing coil is described.
2, probe into the size (checking Faraday's electromagnetic induction law) of induction electromotive force.
1. the relation of the induction electromotive force and the number of turn
At first the pointer of regulation voltage table makes it to point to " 0 " point.Turn on the power switch, the plug of " 1 circle " coil in second group of coil (each of 1 circle, 2 circles, 3 circles, 4 circles) be inserted on the socket, again with this coil near circular field region, when the pointer for the treatment of voltage table was stablized, the numerical value of read-out voltage was four lattice.In like manner, " 2 circle ", " 3 circle ", " 4 circle " coil are inserted respectively on the socket, near magnetic field, when the pointer for the treatment of voltage table is stablized, the numerical value of read-out voltage, the result is as follows:
| The number of turn (s) | 1? | 2? | 3? | 4? |
| Voltage (lattice) | 4? | 8? | 12? | 16? |
The size that induction electromotive force has been described is directly proportional with the number of turn.
2. the relation of induction electromotive force and area coil
The 3rd group of coil (1/4s, 2/4s, 3/4s, 4/4s) obtained following result according to above-mentioned method operation:
| Area (s) | 1/4s? | 2/4s? | 3/4s? | 4/4s? |
| Voltage (lattice) | 1? | 2? | 3? | 4? |
The size that induction electromotive force has been described is directly proportional with area coil.
By
The size of induction electromotive force is directly proportional with the rate of change of magnetic flux as can be known.
3. the student reaches a conclusion by probing into of above two aspects: the size of induction electromotive force is directly proportional with the number of turn of coil, follows the rate of change of magnetic flux to be directly proportional.
This is Faraday's electromagnetic induction law just, thereby has verified Faraday's electromagnetic induction law.
3, probe into electromagnetic production process.
Electromagnetic induction is the basis that electromagnetic wave forms.The 4th group of coil by being nested together mutually as shown in figure 10, hung on the teaching aid, following coil is overlapped with circular field region on the teaching aid.Turn on the power switch, be placed on respectively on each coil on the teaching aid with the 3rd coil in first group of coil, miniature bulb can both be luminous on each coil, and a little less than the brightness more and more.This phenomenon has illustrated that the magnetic field that changes has formed changing electric field in the space around, and the electric field of variation has formed the electric current that changes again in coil, and the electric current of this variation has formed the magnetic field that changes again in the next stage coil.By that analogy, " magnetic is given birth to ", " electricity is magnetisation again " have formed electromagnetic wave aloft.
Good effect of the present utility model is: for " electromagnetic induction " and " electromagnetic formation and emission " experimental teaching provides the Magnetic Field Source of variation, do a lot about " electromagnetic induction phenomenon ", " law of electromagnetic induction " and experiments such as " electromagnetic generation and emissions ".Experimental implementation is simple, and phenomenon is obvious, and is interesting strong.Can curve the closed circuit of Any shape with any conductor,, all can have induction current to produce near field region.Can produce powerful induction current, maximum current can reach 100 amperes; Also can provide power supply for the electrical appliance of low-voltage and high-current.
Description of drawings:
Fig. 1 is the utility model circuit theory diagrams;
Fig. 2, Fig. 3, Fig. 4 are experimental circuit element circuit figure of the present utility model.
Embodiment
According to shown in Figure 1, power supply unit comprises semiconductor bridge rectifier BD and filter inductance L
2, capacitor C
2Form filtering circuit, pulse direct current is become constant direct current, for inverter circuit provides steady voltage.Low-tension supply is produced by common transformer, also can use switch transformer to obtain, provide+5V ,+18V voltage.
In the inversion unit, by inductance L
1, capacitor C
1Antiresonant circuit, IGBT pipe D forms L
1Be the coil that produces high frequency magnetic field, it and resonant capacitor C
1Form antiresonant circuit, at IGBT pipe high speed and conducting clocklike and cut-off state pressure, L
1, C
1Antiresonant circuit constantly obtains energy from power supply, forms L
1, C
1Vibration.
From L
1, C
1Obtain synchronizing signal in the oscillation circuit, produce simultaneously, for the conducting of IGBT pipe provides the front wheel driving waveform with the frequency sawtooth wave.Synchronizing signal is by LM339 comparer IC
2Produce, its signal is taken from L
1, C
1Oscillating capacitance C
1Two ends.One end passes through resistance R
1With R
2The bleeder circuit dividing potential drop is input to comparer IC
2Negative input end V-, the other end passes through resistance R
3With R
4Be input to comparer IC
2Positive input terminal V+ because L
1The inductance effect, at this moment the V-dividing potential drop is greater than the V+ dividing potential drop, comparer IC
2Output low level is through capacitor C
4, resistance R
6Input to the IGBT tube drive circuit (by triode Q after the shaping circuit shaping that constitutes
1, Q
2, resistance R
7, C
6Form), make the IGBT pipe continue conducting, after the inductance accumulation of energy finished, V+ was a bit larger tham the V-dividing potential drop, comparer IC
2Upset output high level, the IGBT pipe ends.L
1, C
1Oscillator produces vibration, works as C
1Discharge at the end the V-dividing potential drop occurs once more greater than V+ dividing potential drop situation, comparer IC
2Output low level, IGBT manages conducting once more, and oscillatory circuit is finished a working cycle.So oscillation circuit synchronization control circuit be triggered start after, only otherwise cut off the electricity supply, so whole oscillation circuit will be worked down always.Q
1, Q
2Be the triode of two polarity complementations, form push-pull circuit, formed the IGBT driving circuit, its output terminal is connected with the base stage of IGBT pipe.
The electromagnetic induction experiment circuit unit is by coil L
3, voltage table V constitutes the mutual cover induction coil of sealing, with coil L
1Constitute sensor circuit.
Coil L
3Use 6m
2Copper rubber covered wire (or flexible cord) and miniature bulb R are linked to be the closed-loop path, and the number of turn is respectively 1 circle, 2 circles, 3 circles, 4 circles (as shown in Figure 2).
Coil L
3Use 6m
2The copper rubber covered wire curves diameter 30cm, and the number of turn is respectively four coils of 1 circle, 2 circles, 3 circles, 4 circles, and the two ends of coil and plug K connect together.By plug K and socket coil is connected to voltage table V and goes up (as shown in Figure 3).
Coil L
3Use 6m
2The copper rubber covered wire curves three groups of circular closure coils by two diameter 30cm, and these three groups of coils can be nested together (as shown in Figure 4) mutually.
During experiment, above-mentioned four groups of coils respectively near coil L1, can be realized the induction of L1 and L3, from voltage table V or miniature bulb R see experimental phenomena.
Claims (4)
1. an electromagnetic induction demonstration device is characterized in that: bridge rectifier BD and filter inductance L
2, capacitor C
2The filtering circuit of forming connects, and pulse direct current is become constant direct current, for inverter circuit provides steady voltage; Low-tension supply by common transformer generation+5V ,+18V voltage; In inversion unit, by inductance L
1, capacitor C
1Resonant circuit that constitutes in parallel and IGBT pipe D form the formation vibration; Inductance L
1, capacitor C
1The synchronizing signal of resonant circuit meets comparer IC
2Produce with frequency sawtooth wave, comparer IC
2Output low level is through capacitor C
4Be input to by triode Q
1, Q
2Form push-pull circuit, make Q
1, Q
2The output high level; The triode Q of two polarity complementations
1, Q
2Output terminal be connected with the base stage of IGBT pipe, formed the IGBT driving circuit;
The electromagnetic induction experiment circuit unit is by coil L
3, voltage table V constitutes the mutual cover induction coil of sealing, with coil L
1Constitute sensor circuit.
2. electromagnetic induction demonstration instrument according to claim 1 is characterized in that: coil L
3For copper rubber lead and miniature bulb R are linked to be the closed-loop path, the number of turn is respectively 1 circle, 2 circles, 3 circles, 4 circles.
3. electromagnetic induction demonstration instrument according to claim 1 is characterized in that: coil L
3For copper rubber lead curves diameter 30cm, the number of turn is respectively four coils of 1 circle, 2 circles, 3 circles, 4 circles, and the two ends of coil and plug K connect together by plug K and socket coil L
3Be connected on the voltage table V.
4. electromagnetic induction demonstration instrument according to claim 1 is characterized in that: coil L
3Curve the circular closure coil of two diameter 30cm for copper rubber lead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201403011U CN201707817U (en) | 2010-03-17 | 2010-03-17 | Electromagnetic induction demonstrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201403011U CN201707817U (en) | 2010-03-17 | 2010-03-17 | Electromagnetic induction demonstrator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201707817U true CN201707817U (en) | 2011-01-12 |
Family
ID=43444972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201403011U Expired - Fee Related CN201707817U (en) | 2010-03-17 | 2010-03-17 | Electromagnetic induction demonstrator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201707817U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136214A (en) * | 2011-03-08 | 2011-07-27 | 山东省远大网络多媒体股份有限公司 | Faraday electromagnetic induction tester |
| CN106530916A (en) * | 2016-11-16 | 2017-03-22 | 商洛学院 | Magnetoelectric conversion device |
| CN106803390A (en) * | 2015-11-26 | 2017-06-06 | 重庆尊来科技有限责任公司 | A kind of hookup being made up of triode |
-
2010
- 2010-03-17 CN CN2010201403011U patent/CN201707817U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136214A (en) * | 2011-03-08 | 2011-07-27 | 山东省远大网络多媒体股份有限公司 | Faraday electromagnetic induction tester |
| CN106803390A (en) * | 2015-11-26 | 2017-06-06 | 重庆尊来科技有限责任公司 | A kind of hookup being made up of triode |
| CN106530916A (en) * | 2016-11-16 | 2017-03-22 | 商洛学院 | Magnetoelectric conversion device |
| CN106530916B (en) * | 2016-11-16 | 2023-10-20 | 商洛学院 | Magneto-electric conversion device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110112 Termination date: 20130317 |