Alternating current asynchronous motor for teaching

Abstract

The utility model discloses an alternating-current asynchronous motor for teaching, which comprises a workbench, a power supply arranged on the workbench, a slide rheostat, a capacitor, a first coil, a second coil, a rotary drum seat, a single-pole single-throw switch, a double-pole double-throw switch and a rotary drum rotationally sleeved on the rotary drum seat, the power supply, the single-pole single-throw switch, the slide rheostat, the second coil and the capacitor are sequentially connected in series; one end of a middle column of the double-pole double-throw switch is connected between the power supply and the capacitor, and the other end of the middle column is connected between the slide rheostat and the single-pole single-throw switch; the first coil is connected with the double-pole-double-throw switch; the first coil and the second coil are arranged at an angle of 90 degrees; the rotary drum is arranged on the right-angle vertex of the first coil and the second coil; an iron core is arranged in the first coil. According to the scheme, the asynchronous motor has the advantages of being simple in structure, visual, reliable and the like, and has very high practical value and popularization value in the technical field of asynchronous motors.

Description

Technical Field

[0001] The utility model relates to the technical field of asynchronous motors, in particular to an AC asynchronous motor for teaching. Background Art

[0002] Asynchronous motors are also called "induction motors", that is, the rotor is placed in a rotating magnetic field, and under the action of the rotating magnetic field, a torque is obtained, so the rotor rotates. At present, asynchronous motors in the prior art are packaged with a base outside the stator, and its internal space cannot be directly observed. In teaching, the asynchronous motor can only observe the external shape and the wiring of the junction box, etc., and the internal structure and the operating principle cannot be seen, which is not conducive to intuitive observation in teaching.

[0003] Therefore, it is urgent to propose an AC asynchronous motor for teaching which is simple in structure, intuitive and reliable. Utility Model Content

[0004] In view of the above problems, the purpose of the present invention is to provide an AC asynchronous motor for teaching. The technical solution adopted by the present invention is as follows:

[0005] An AC asynchronous motor for teaching comprises a workbench, a power supply, a sliding rheostat, a capacitor, a first coil, a second coil, a drum seat, a single-pole single-throw switch and a double-pole double-throw switch arranged on the workbench, and a drum rotatably sleeved on the drum seat; the power supply, the single-pole single-throw switch, the sliding rheostat, the second coil and the capacitor are connected in series in sequence; one end of the middle column of the double-pole double-throw switch is connected between the power supply and the capacitor, and the other end of the middle column is connected between the sliding rheostat and the single-pole single-throw switch; the first coil is connected to the double-pole double-throw switch; the first coil and the second coil are arranged at 90 degrees; the drum is placed at the right-angle vertex of the first coil and the second coil; an iron core is arranged in the first coil.

[0006] Furthermore, the drum is one of an aluminum drum, an aluminum squirrel-cage drum, a copper drum, and a copper squirrel-cage drum.

[0007] Furthermore, the power supply is an AC student power supply, and the voltage adjustable range is: 0~16V.

[0008] Compared with the prior art, the utility model has the following beneficial effects:

[0009] (1) The utility model is provided with a first coil, a second coil, a capacitor and a sliding rheostat, and the first coil and the second coil are arranged at 90 degrees. In the resonant circuit of the second coil, the capacitor and the sliding rheostat, the size of the capacitor is selected so that the inductive reactance of the second coil is equal to the capacitive reactance of the capacitor. Since the phase difference between the voltage of the second coil and the voltage of the capacitor is π, the sum of the voltages at both ends of the second coil and the capacitor is always zero, and the power supply voltage is fully loaded to both ends of the sliding rheostat, that is, the current passing through the second coil is synchronized with the AC power supply voltage. In the other branch, the AC power supply voltage leads the current passing through the first coil. This makes the current through the second coil lead the current through the first coil. Only by placing the central axes of the two coils vertically, a horizontal rotating magnetic field can be generated in the area where the drum is located. The utility model places the drum in the horizontal rotating magnetic field, and the magnetic field rotation direction can be known according to the rotation direction of the drum.

[0010] (2) The utility model provides a double-pole double-throw switch to cross-commutate the two ends of the first coil to achieve the switching of the rotation direction of the drum.

[0011] In summary, the utility model has the advantages of simple structure, intuitiveness and reliability, and has high practical value and promotion value in the field of asynchronous motor technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope of protection. For those skilled in the art, other relevant drawings can be obtained based on these drawings without creative work.

[0013] Figure 1 It is a structural schematic diagram of the utility model.

[0014] Figure 2 This is the wiring schematic diagram of the utility model.

[0015] In the above drawings, the component names corresponding to the reference numerals are as follows:

[0016] 1. Workbench; 2. Power supply; 3. Sliding rheostat; 4. Capacitor; 5. First coil; 6. Second coil; 7. Drum base; 8. Drum; 9. Single-pole single-throw switch; 10. Double-pole double-throw switch. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of this application clearer, the utility model is further described below in conjunction with the accompanying drawings and embodiments, and the implementation methods of this utility model include but are not limited to the following embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0018] In this embodiment, the term "and / or" is merely a term used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent three situations: A exists alone, A and B exist at the same time, and B exists alone.

[0019] The terms "first" and "second" in the description and claims of this embodiment are used to distinguish different objects rather than to describe a specific order of objects. For example, a first target object and a second target object are used to distinguish different target objects rather than to describe a specific order of target objects.

[0020] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0021] In the description of the embodiments of the present application, unless otherwise specified, the meaning of "multiple" refers to two or more than two. For example, multiple processing units refer to two or more processing units; multiple systems refer to two or more systems.

[0022] like Figure 1 to Figure 2 As shown, this embodiment provides an AC asynchronous motor for teaching, which includes a workbench 1, a power supply 2, a sliding rheostat 3, a capacitor 4, a first coil 5, a second coil 6, a drum seat 7, a single-pole single-throw switch 9 and a double-pole double-throw switch 10 arranged on the workbench 1, and a drum 8 rotatably sleeved on the drum seat 7. An iron core is arranged in the first coil 5. In addition, the drum 8 can be an aluminum drum or an aluminum squirrel-cage drum.

[0023] In this embodiment, the power supply 2, the single-pole single-throw switch 9, the sliding rheostat 3, the second coil 6 and the capacitor 4 are connected in series in sequence to form a branch. In addition, one end of the middle column of the double-pole double-throw switch 10 is connected between the power supply 2 and the capacitor 4, and the other end of the middle column is connected between the sliding rheostat 3 and the single-pole single-throw switch 9 to form another branch. Among them, in the resonant circuit of the second coil 6, the capacitor 4 and the sliding rheostat 3, a suitable capacitor is selected to make the inductive reactance of the second coil 6 equal to the capacitive reactance of the capacitor C. In this embodiment, the calculation of the capacitance, resistance and inductive reactance of the second coil 6 of the resonant circuit is a conventional technology and will not be repeated here.

[0024] Since the phase difference between the voltage of the second coil 6 and the voltage of the capacitor is π, the sum of the voltages across the second coil 6 and the capacitor is always zero, and the power supply voltage is fully loaded to both ends of the sliding resistor, that is, the current through the second coil 6 is synchronized with the AC power supply voltage. However, the AC power supply voltage in the other branch leads the current through the first coil. This causes the current through the second coil to lead the current through the first coil. By simply placing the central axes of the two coils vertically, a horizontal rotating magnetic field can be generated in the area where the drum is located; that is, the first coil 5 and the second coil 6 are arranged at 90°; the drum 8 is placed at the right-angle vertex of the first coil 5 and the second coil 6.

[0025] In this embodiment, if Figure 2 As shown, the right side of the double-pole double-throw switch 10 is provided with S1 and S2 connection terminals, and the left side is provided with S3 and S4 connection terminals, and the double-pole double-throw switch 10 is used to cross-commutate the two ends of the first coil 5. When the double-pole double-throw switch 10 is placed at the S1 and S2 connection terminals, as shown in FIG. Figure 1 , a horizontally rotating magnetic field is generated in the area where the drum 8 is located. When the direction of rotation of the horizontal magnetic field needs to be changed, the double-pole double-throw switch 10 is placed at the connection ends of S3 and S4.

[0026] The above embodiments are only preferred embodiments of the present utility model and are not intended to limit the protection scope of the present utility model. Any changes that adopt the design principles of the present utility model and are made through non-creative labor on this basis should fall within the protection scope of the present utility model.

Claims

1. An AC asynchronous motor for teaching, characterized in that: The invention comprises a workbench (1), a power source (2), a sliding rheostat (3), a capacitor (4), a first coil (5), a second coil (6), a rotating drum seat (7), a single-pole single-throw switch (9) and a double-pole double-throw switch (10) arranged on the workbench (1), and a rotating drum (8) rotatably sleeved on the rotating drum seat (7); the power source (2), the single-pole single-throw switch (9), the sliding rheostat (3), the second coil (6) and the capacitor (4) are connected in series in sequence; one end of the middle column of the double-pole double-throw switch (10) is connected between the power source (2) and the capacitor (4), and the other end of the middle column is connected between the sliding rheostat (3) and the single-pole single-throw switch (9); the first coil (5) is connected to the double-pole double-throw switch (10); the first coil (5) and the second coil (6) are arranged at 90 degrees; the rotating drum (8) is placed at the right-angle vertex of the first coil (5) and the second coil (6); and an iron core is arranged in the first coil (5).

2. The AC asynchronous motor for teaching according to claim 1, characterized in that: The rotating drum (8) is one of an aluminum rotating drum, an aluminum squirrel-cage rotating drum, a copper rotating drum, and a copper squirrel-cage rotating drum.

3. The AC asynchronous motor for teaching according to claim 1, characterized in that: The power supply (2) is an AC student power supply, and the voltage adjustable range is: 0 to 16V.

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