CN214175477U - Motor back electromotive force demonstration device - Google Patents
Motor back electromotive force demonstration device Download PDFInfo
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- CN214175477U CN214175477U CN202120302645.6U CN202120302645U CN214175477U CN 214175477 U CN214175477 U CN 214175477U CN 202120302645 U CN202120302645 U CN 202120302645U CN 214175477 U CN214175477 U CN 214175477U
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- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The utility model relates to a motor teaching technical field. The first indication lamp group is used for indicating the current direction in the first motor, the second indication lamp group is used for indicating the current direction in the second motor, a storage battery is arranged on the lower portion of the base, the first motor is electrically connected with the storage battery, the first indication lamp group is connected in series in a circuit of the first motor and the storage battery, and the positive and negative poles of the second indication lamp group are respectively connected with the positive and negative poles of the second motor. The utility model discloses demonstrate the back electromotive force through the light indication that can observe to be convenient for student's understanding.
Description
Technical Field
The utility model relates to a motor teaching technical field, more specifically say, relate to a motor back electromotive force presentation device.
Background
The back electromotive force is an electromotive force generated by a tendency of a change in a counter current. Back emf typically occurs in electromagnetic coils such as relay coils, solenoid valves, contactor coils, motors, inductors, and the like. When the DC motor is started initially, the permanent magnetic winding establishes one magnetic field, the armature current generates another magnetic field, and the two magnetic fields interact with each other to start the motor to run. The armature winding rotates in the magnetic field, thus producing a generator effect. In effect rotating the armature generates an induced electromotive force, opposite in polarity to the armature voltage, which is referred to as a back electromotive force. The back emf consumes electrical energy in the circuit, but it is not a loss, and the portion of electrical energy corresponding to the back emf will be converted into useful energy for the electrical consumer, e.g., mechanical energy of the motor, chemical energy of the battery, etc. It can be seen that the magnitude of the back electromotive force means the strength of the power of the electrical appliance for converting the total input energy into useful energy.
However, when teaching the counter electromotive force of the motor, it is difficult for the student to understand the existence of the counter electromotive force because the existence of the counter electromotive force is difficult to observe.
SUMMERY OF THE UTILITY MODEL
The utility model provides a motor back electromotive force presentation device for the existence of the inside back electromotive force of demonstration motor, thereby make things convenient for the student to study.
In order to realize the above-mentioned purpose, the utility model provides a motor back electromotive force presentation device, including the base fixed mounting has first motor and second motor on the base, first motor with second motor transmission connects be provided with first instruction banks and second instruction banks on the base, first instruction banks is used for instructing current direction in the first motor, second instruction banks is used for instructing the inside current direction of second motor the base lower part is provided with the battery, first motor with battery electric connection, first instruction banks establishes ties first motor with in the circuit of battery, the positive negative pole of second instruction banks respectively with the positive negative pole of second motor is connected.
The utility model provides an above-mentioned technical scheme provides a motor back electromotive force presentation device, the first motor through setting drives the second motor and rotates, and the positive negative pole through the second indicator lamp group that sets up and second motor is connected to can produce electric current through the rotation of second motor, and instruct the direction of electric current through the second indicator lamp group, thereby demonstrate the existence of first motor at the back electromotive force of rotation in-process.
Additionally, the utility model discloses above-mentioned technical scheme provides a motor back electromotive force presentation device still has following technical characteristic:
as an optimized scheme of the utility model still fixed mounting has first ampere meter and second ampere meter on the base, first ampere meter with first instruction banks is established ties, the second ampere meter with second instruction banks is established ties.
As another preferred scheme of the utility model, first pilot lamp group comprises forward first pilot lamp and reverse first pilot lamp, forward first pilot lamp with reverse first pilot lamp is parallelly connected.
As another preferable aspect of the present invention, the second indicator light group is composed of a forward second indicator light and a reverse second indicator light, and the forward second indicator light is connected in parallel with the reverse second indicator light.
As another preferred embodiment of the present invention, the forward first indicator light, the backward first indicator light, the forward second indicator light and the backward second indicator light are light emitting diodes, wherein the forward first indicator light is connected in series in the forward direction, the backward first indicator light is connected in series in the backward direction, the connection polarity of the forward second indicator light and the forward first indicator light is the same, and the connection polarity of the backward second indicator light and the backward first indicator light is the same.
As another preferred aspect of the present invention, the first indicator light of forward direction, the first indicator light of backward direction, the second indicator light of forward direction and the second indicator light of backward direction all cover and have arrow-shaped lamp body, and the arrow-shaped lamp body that covers on the first indicator light of forward direction with the arrow-shaped lamp body opposite direction that covers on the first indicator light of backward direction, the arrow-shaped lamp body that covers on the second indicator light of forward direction with the arrow-shaped lamp body opposite direction that covers on the second indicator light of backward direction.
As another preferable proposal of the utility model, the base is provided with a first motor connecting column, a second motor connecting column, a first indicator lamp group connecting column, a second indicator lamp group connecting column, a first indicator lamp group connecting column and a second indicator lamp group connecting column, the first motor connecting column I and the second motor connecting column II are respectively connected with the anode and the cathode of the first motor, the first second motor connecting column and the second motor connecting column are respectively connected with the anode and the cathode of the second motor, the first indicator lamp group connecting column and the second indicator lamp group connecting column are respectively connected with the two electrodes of the first indicator lamp group, the first indicator lamp set connecting column and the second indicator lamp set connecting column are respectively connected with two electrodes of the second indicator lamp set.
As another preferable aspect of the present invention, a first belt wheel is fixedly mounted to an output end of the first motor, a second belt wheel is fixedly mounted to an output end of the second motor, and the first belt wheel and the second belt wheel are connected by a belt transmission.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the utility model drives the second motor to rotate through the arranged first motor, and the second motor synchronously rotates along with the first motor in the same direction, so that the electromotive force generated by the rotation of the second motor can be used as the counter electromotive force of the first motor to replace; the first indicating lamp group is used for indicating the current direction in the first motor, the second indicating lamp group is used for indicating the current direction in the second motor, the existence of the counter electromotive force generated by the first motor in the rotating process can be clearly demonstrated through the comparison of the first indicating lamp group and the second indicating lamp group, and the opposite polarity of the counter electromotive force and the armature voltage can be demonstrated through the comparison of the two indicating lamp groups. The utility model discloses the counter electromotive force that will unable the observation demonstrates through the mode that the light that can observe instructs to be convenient for the student observe and understand.
Drawings
Fig. 1 is a schematic front view of the present invention;
FIG. 2 is a top view of the present invention;
FIG. 3 is a lower structure view of the present invention;
fig. 4 is a circuit diagram of the present invention.
Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 4 is:
1. a base; 2. a first motor; 21. a first pulley; 22. a first motor connecting column; 23. a second motor connecting column; 3. a second motor; 31. a second pulley; 32. the first motor connecting column; 33. a second motor connecting column II; 4. a belt; 5. a first ammeter; 6. a second ammeter; 7. a first indicator light set; 71. a forward first indicator light; 72. a reverse first indicator light; 73. the first indicator light group is connected with the first connecting column; 74. the second connecting column of the first indicator light group; 8. a second indicator light set; 81. a forward second indicator light; 82. a reverse second indicator light; 83. the first indication lamp group is connected with the first connecting column; 84. a second indication lamp group is connected with the second column; 9. a storage battery; 91. a first storage battery connecting column; 92. and a second storage battery connecting column.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
An embodiment of the present invention is described below with reference to fig. 1 to 4.
The motor back electromotive force demonstration device shown in fig. 1-4 comprises a base 1, wherein a first motor 2 and a second motor 3 are fixedly mounted on the base 1, a first belt wheel 21 is fixedly mounted at the output end of the first motor 2, a second belt wheel 31 is fixedly mounted at the output end of the second motor 3, the first belt wheel 21 and the second belt wheel 31 are in transmission connection through a belt 4, and the first motor 2 can drive the second motor 3 to synchronously rotate through the belt 4. It should be noted that the same motor is used for the first electric motor 2 and the second electric motor 3, so that the electromotive force generated by the second electric motor 3 under the driving of the first electric motor 2 can be demonstrated as the counter electromotive force of the first electric motor 2. The base 1 is provided with a first indicator lamp group 7 and a second indicator lamp group 8, the first indicator lamp group 7 is used for indicating the current direction in the first motor 2, the second indicator lamp group 8 is used for indicating the current direction in the second motor 3, the lower portion of the base 1 is provided with a storage battery 9, the first motor is electrically connected with the storage battery 9, the first indicator lamp group 7 is connected in series in a circuit of the first motor 2 and the storage battery 9, and the positive and negative poles of the second indicator lamp group 8 are respectively connected with the positive and negative poles of the second motor 3. The base 1 is also fixedly provided with a first ammeter 5 and a second ammeter 6, the first ammeter 5 is connected with the first indicator lamp group 7 in series, and the second ammeter 6 is connected with the second indicator lamp group 8 in series. The direction and magnitude of the current in the first electric motor 2 can be indicated by the first current meter 5, and the direction and magnitude of the current in the second electric motor 3 can be indicated by the second current meter 6.
Specifically, the first indicator light group 7 is composed of a forward first indicator light 71 and a reverse first indicator light 72, and the forward first indicator light 71 is connected in parallel with the reverse first indicator light 72. The second indicator light group 8 is composed of a forward second indicator light 81 and a reverse second indicator light 82, and the forward second indicator light 81 is connected in parallel with the reverse second indicator light 82. The forward first indicator lamp 71, the reverse first indicator lamp 72, the forward second indicator lamp 81 and the reverse second indicator lamp 82 are all light emitting diodes, wherein the forward first indicator lamp 71 is connected in series in a forward direction in the circuit, the reverse first indicator lamp 72 is connected in series in a reverse direction in the circuit, the connection polarity of the forward second indicator lamp 81 and the forward first indicator lamp 71 is the same, and the connection polarity of the reverse second indicator lamp 82 and the reverse first indicator lamp 72 is the same. The base 1 is provided with a first motor connecting column 22, a second motor connecting column 23, a first motor connecting column 32, a second motor connecting column 33, a first indicator lamp group connecting column 73, a second indicator lamp group connecting column 74, a first indicator lamp group connecting column 83 and a second indicator lamp group connecting column 84, the first motor connecting column 22 and the second motor connecting column 23 are respectively connected with the anode and the cathode of the first motor 2, the first motor connecting column 32 and the second motor connecting column 33 are respectively connected with the anode and the cathode of the second motor 3, the first indicator lamp group connecting column 73 and the second indicator lamp group connecting column 74 are respectively connected with the two electrodes of the first indicator lamp group 7, the first indicator lamp group connecting column 83 and the second indicator lamp group connecting column 84 are respectively connected with the two electrodes of the second indicator lamp group 8, the storage battery 9 is provided with a first storage battery connecting column 91 and a second storage battery connecting column 92. When the electric motor is used, the connecting columns of the parts are electrically connected through the connecting wires, so that the first motor 2 can be powered on, and the second motor 3 is driven to rotate.
Specifically, arrow-shaped lamp housings are covered on the forward first indicator lamp 71, the reverse first indicator lamp 72, the forward second indicator lamp 81 and the reverse second indicator lamp 82, the direction of the arrow-shaped lamp housing covered on the forward first indicator lamp 71 is opposite to that of the arrow-shaped lamp housing covered on the reverse first indicator lamp 72, and the direction of the arrow-shaped lamp housing covered on the forward second indicator lamp 81 is opposite to that of the arrow-shaped lamp housing covered on the reverse second indicator lamp 82. Thus, when the first motor 2 is connected to the battery 9, the rotation of the first motor 2 is reversed differently depending on the connection electrode, that is, the current flow direction in the first motor 2 is different, and therefore, only one of the forward first indicator lamp 71 and the reverse first indicator lamp 72 is lit depending on the connection electrode, and the current direction at that time is displayed by the arrow-shaped lamp housing. By driving the second motor 3 to rotate, the second motor 3 will generate electromotive force and current due to the magnetic field cut by the coil, the current at this time will light the forward second indicator lamp 81 or the reverse second indicator lamp 82, and display the current direction thereof through the arrow-shaped lamp housing, and by comparing the current direction with the current direction in the first indicator lamp set 7, the electromotive force in the second motor 3 can be demonstrated, and the electromotive force in the second motor 3 is the counter electromotive force generated by the first motor 2 in the rotating process.
The using method comprises the following steps:
when the motor is used, the first motor 2 and the storage battery 9 are connected through a lead, so that the first motor 2 rotates, the second motor 3 is driven to rotate through the belt 4, the current direction in the first motor 2 can be indicated through the first indicating lamp group 7 and the current magnitude at the moment can be indicated through the first ammeter 5, and the current direction in the second motor 3 can be indicated through the second indicating lamp group 8 and the current magnitude at the moment can be indicated through the second ammeter 6. It can be clearly seen from observation that the current generated in the second motor 3 is always opposite to the current direction in the first motor 2, that is, the counter electromotive force generated in the first motor 2 is always opposite to the armature voltage of the first motor 2, so that the counter electromotive force which cannot be observed is converted into the current direction and is demonstrated through the observable light emitting diodes, and the teaching is simple and clear and is convenient for students to learn and understand.
In the present application, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art. The terms "upper surface", "lower surface", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore should not be construed as limiting the present invention.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A motor back electromotive force demonstration device is characterized in that: comprises a base (1), a first motor (2) and a second motor (3) are fixedly arranged on the base (1), the first motor (2) is in transmission connection with the second motor (3), a first indicator lamp group (7) and a second indicator lamp group (8) are arranged on the base (1), the first indicator light group (7) is used for indicating the current direction in the first motor (2), the second indicator light group (8) is used for indicating the current direction inside the second motor (3), a storage battery (9) is arranged at the lower part of the base (1), the first motor (2) is electrically connected with the storage battery (9), the first indicator light group (7) is connected in series in the circuit of the first motor (2) and the storage battery (9), and the positive and negative electrodes of the second indicator light group (8) are respectively connected with the positive and negative electrodes of the second motor (3).
2. A motor back emf demonstration apparatus according to claim 1, wherein: the base (1) is also fixedly provided with a first ammeter (5) and a second ammeter (6), the first ammeter (5) is connected with the first indicator lamp set (7) in series, and the second ammeter (6) is connected with the second indicator lamp set (8) in series.
3. A motor back emf demonstration apparatus according to claim 2 wherein: the first indicator lamp group (7) is composed of a forward first indicator lamp (71) and a reverse first indicator lamp (72), and the forward first indicator lamp (71) is connected with the reverse first indicator lamp (72) in parallel.
4. A motor back emf demonstration apparatus according to claim 3 wherein: the second indicator lamp group (8) is composed of a forward second indicator lamp (81) and a reverse second indicator lamp (82), and the forward second indicator lamp (81) is connected with the reverse second indicator lamp (82) in parallel.
5. A motor back emf demonstration apparatus according to claim 4 further comprising: the forward first indicator lamp (71), the reverse first indicator lamp (72), the forward second indicator lamp (81) and the reverse second indicator lamp (82) are all light emitting diodes, wherein the forward first indicator lamp (71) is connected in series in a forward direction, the reverse first indicator lamp (72) is connected in series in a reverse direction, the connection polarity of the forward second indicator lamp (81) and the connection polarity of the forward first indicator lamp (71) are the same, and the connection polarity of the reverse second indicator lamp (82) and the connection polarity of the reverse first indicator lamp (72) are the same.
6. A motor back emf demonstration apparatus according to claim 5 wherein: the first pilot lamp of forward (71), reverse first pilot lamp (72), forward second pilot lamp (81) and all cover arrow shape lamp body on reverse second pilot lamp (82), and the arrow shape lamp body that covers on forward first pilot lamp (71) with the arrow shape lamp body opposite direction that covers on reverse first pilot lamp (72), the arrow shape lamp body that covers on forward second pilot lamp (81) with the arrow shape lamp body opposite direction that covers on reverse second pilot lamp (82).
7. A motor back emf demonstration apparatus according to claim 6, wherein: the base (1) is provided with a first motor connecting column (22), a second motor connecting column (23), a first second motor connecting column (32), a second motor connecting column (33), a first indicator lamp group connecting column (73), a second indicator lamp group connecting column (74), a first indicator lamp group connecting column (83) and a second indicator lamp group connecting column (84), the first motor connecting column (22) and the second motor connecting column (23) are respectively connected with the anode and the cathode of the first motor (2), the first second motor connecting column (32) and the second motor connecting column (33) are respectively connected with the anode and the cathode of the second motor (3), the first indicator lamp group connecting column (73) and the second indicator lamp group connecting column (74) are respectively connected with the two electrodes of the first indicator lamp group (7), the first indicator lamp set connecting column (83) and the second indicator lamp set connecting column (84) are respectively connected with two electrodes of the second indicator lamp set (8).
8. A motor back emf demonstration apparatus according to claim 1, wherein: the output end of the first motor (2) is fixedly provided with a first belt wheel (21), the output end of the second motor (3) is fixedly provided with a second belt wheel (31), and the first belt wheel (21) is in transmission connection with the second belt wheel (31) through a belt (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120302645.6U CN214175477U (en) | 2021-02-04 | 2021-02-04 | Motor back electromotive force demonstration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120302645.6U CN214175477U (en) | 2021-02-04 | 2021-02-04 | Motor back electromotive force demonstration device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214175477U true CN214175477U (en) | 2021-09-10 |
Family
ID=77594482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120302645.6U Expired - Fee Related CN214175477U (en) | 2021-02-04 | 2021-02-04 | Motor back electromotive force demonstration device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214175477U (en) |
-
2021
- 2021-02-04 CN CN202120302645.6U patent/CN214175477U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210910 |