Three-phase ac power demonstration device for electrical engineering teaching and training
By designing a three-phase AC power demonstration device for electrical engineering teaching and training, the problem of the difficulty in intuitively demonstrating three-phase sinusoidal AC power was solved, enabling students to intuitively understand three-phase AC power and stimulating their interest in learning.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 张金刚
- Filing Date
- 2025-05-21
- Publication Date
- 2026-06-09
AI Technical Summary
In current teaching of basic electrical engineering, the knowledge of three-phase sinusoidal alternating current is difficult to demonstrate intuitively, leading to difficulties in student understanding and low learning interest.
Design a three-phase AC power demonstration device for electrical engineering teaching and training. Through three coaxially connected single-phase AC power demonstration devices and a recording paper mechanism, the phase relationship of three-phase AC power is demonstrated. The waveform and phase changes of three-phase AC power are simulated by a combination of a main shaft, a disk, a connecting rod, a slider and a recording pen.
This allows students to visually observe the waveform, amplitude, and phase relationship of three-phase alternating current, improving teaching effectiveness, shortening teaching time, and stimulating students' interest in learning.
Smart Images
Figure CN224341957U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electrical experimental teaching aids, specifically a three-phase AC power demonstration device for electrical engineering teaching and training. Background Technology
[0002] Three-phase sinusoidal alternating current is widely used in industry, agriculture, and daily life. In terms of power transmission, three-phase transmission is superior to single-phase transmission.
[0003] Three-phase alternating current (AC) is a power system composed of three AC circuits with the same frequency, equal potential amplitude, and a phase difference of 120° between each other. Currently, in basic electrical engineering training, teachers mostly demonstrate three-phase sinusoidal AC by drawing diagrams on the blackboard or verbally explaining the content to students. This teaching method is not intuitive, is abstract, and makes the content difficult to understand, and it does not easily stimulate students' interest in learning. There is a need to design a teaching aid that allows students to participate and intuitively experience three-phase sinusoidal AC, thereby improving the quality of teaching. Utility Model Content
[0004] The purpose of this invention is to provide a three-phase alternating current demonstration device for electrical engineering teaching and training. This device can intuitively, vividly, and figuratively demonstrate the characteristics of three-phase alternating current, which helps students better understand the phase relationship of three-phase alternating current.
[0005] The technical solution of this utility model:
[0006] A three-phase AC power demonstration device for electrical engineering teaching and training includes a main shaft, a single-phase AC power demonstration device, a fixed plate, and a recording paper mechanism. Three single-phase AC power demonstration devices are connected by a coaxial mechanism. Each single-phase AC power demonstration device includes a drive shaft assembly, a disc, a connecting rod, a slider, a fixed block, and a recording pen. The main shaft is connected to the disc via the drive shaft assembly. A vertical shaft is fixed on the disc. The vertical shaft is rotatably connected to the connecting rod. The other end of the connecting rod is rotatably connected to the slider. The slider has a long groove in its center, and the fixed block is placed in the long groove and fixed to the fixed plate. The slider slides back and forth on the fixed plate relative to the fixed block. A mounting hole is opened at the other end of the slider, and the recording pen is inserted into the mounting hole and secured in place by bolts. The recording paper of the recording paper mechanism is placed between the fixed plate and the slider. The vertical shafts on the three discs are spatially 120 degrees apart.
[0007] The beneficial effects of this utility model are:
[0008] 1. The concept of three-phase alternating current (AC) is relatively abstract. This teaching aid helps students better understand the elements of three-phase AC. It allows students to visually observe the shape, amplitude, and phase relationship of the waveform, corresponding theoretical knowledge to actual waveforms and enhancing their perceptual understanding. Demonstration with this aid presents complex principles and processes in a more intuitive way, shortening teaching time and improving teaching efficiency. Physical teaching aids make the teaching content more vivid and interesting, attracting students' attention and stimulating their learning interest. Attached Figure Description
[0009] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0010] Figure 1 This is a schematic diagram of the three-phase AC power demonstration device for electrical engineering teaching and training in this application.
[0011] Figure 2 This is a schematic diagram of the three-phase AC power demonstration device for electrical engineering teaching and training, taken from another angle.
[0012] Figure label:
[0013] Main shaft 1; Single-phase AC power demonstration device 2; Fixing plate 3; Recording paper mechanism 4; Drive shaft assembly 21; Disc 22; Connecting rod 23; Slider 24; Fixing block 25; Vertical shaft 27; Long slot 28; Mounting hole 29; Recording paper 41; Paper box 42; Electric paper winding mechanism 43; Active bevel gear 211; First intermediate bevel gear 212; Drive shaft 213; Second intermediate bevel gear 214; Passive bevel gear 215; Disc rotating shaft 216. Detailed Implementation
[0014] To vividly and intuitively demonstrate the phase and variation laws of three-phase sinusoidal alternating current in the teaching of basic electrical engineering knowledge, this application presents a three-phase alternating current demonstration device for electrical engineering teaching and training, which combines theoretical knowledge with practical teaching aids and presents abstract concepts in an intuitive way.
[0015] It should be noted that in the description of this application, the terms "upper", "lower", "left", "right", "inner", and "outer" are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.
[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0017] A three-phase AC power demonstration device for electrical engineering teaching and training includes a main shaft 1, a single-phase AC power demonstration device 2, a fixing plate 3, and a recording paper mechanism 4. The single-phase AC power demonstration device 2 consists of three units connected by a coaxial mechanism. Each single-phase AC power demonstration device 2 includes a drive shaft assembly 21, a disc 22, a connecting rod 23, a slider 24, a fixing block 25, and a recording pen. The main shaft 1 is connected to the disc 22 via the drive shaft assembly 21 and drives the disc to rotate. A vertical shaft 27 is fixed on the disc 22. The vertical shaft 27 is rotatably connected to one end of the connecting rod 23, and the other end of the connecting rod 23 is rotatably connected to one end of the slider 24. The slider 24 has a long groove 28 in its center, and the fixing block 25 is disposed within the long groove 28. The fixing block 28 is fixed to a fixing plate 3. The slider 24 slides back and forth on the fixing plate 3 relative to the fixing block 25. The other end of the slider 24 has a mounting hole, into which the recording pen is inserted and secured with bolts. The recording paper 41 of the recording paper mechanism 4 is disposed between the fixing plate 3 and the slider 24. The vertical axes on the three disks 22 are spatially separated by 120 degrees, meaning that when the three vertical axes are projected onto one disk, they differ by 120 degrees. The fixing block consists of a fixing cap and a limiting post. The diameter of the fixing cap is larger than the width of the long groove on the slider, and the fixing cap presses against the slider to prevent it from slipping off the fixing plate. The diameter of the limiting post is equal to or slightly smaller than the width of the long groove on the slider, restricting the slider from sliding left and right along a straight line.
[0018] To demonstrate the spatial distribution characteristics of three-phase sinusoidal alternating current, a three-disc structure was designed. Each disk is supported and fixed on a drive shaft assembly, which drives the disk to rotate. The three drive shaft assemblies mesh with a main shaft; when the main shaft rotates, the three disks rotate synchronously via the drive shaft assemblies. A small vertical shaft is fixed on each disk, and the shaft is movably connected to a connecting rod. The vertical shafts on the three disks are installed at 120-degree angles to each other according to the disk's orientation. The connecting rod is connected to a slider via a movable hinge at the other end. The connecting rod can rotate relative to the vertical shaft and simultaneously relative to the slider.
[0019] The device of this application also includes a support frame. The main shaft is connected to the motor output shaft via a coupling. The motor is fixed on the support frame, and the main shaft is mounted on the support frame via bearings and bearing seats. A drive shaft housing is fixed on the support frame, and the drive shaft is mounted in the drive shaft housing via bearings and bearing seats. A fixing plate is fixed on the support frame. The cardboard box is fixed on the support frame.
[0020] The slider has a long slotted structure, and two fixing parts mount it to a fixed plate. The slider can slide freely left and right under the constraint of the fixing parts. There is a mounting hole on the right side of the slider, into which a colored marker is inserted and secured by a side screw. When the main shaft drives the three discs to rotate synchronously, the vertical shaft on the disc drives the right-side slider to reciprocate linearly via a connecting rod, converting the circular rotation of the discs into linear reciprocating motion.
[0021] The drive shaft assembly of this application can be any existing technology structure, with the purpose of transmitting power from the main shaft to the disk, causing the disk to rotate. The drive shaft assembly in this embodiment adopts the following structure: the drive shaft assembly 21 includes an active bevel gear 211, a first intermediate bevel gear 212, a drive shaft 213, a second intermediate bevel gear 214, a passive bevel gear 215, and a disk shaft 216. The first intermediate bevel gear 212 and the second intermediate bevel gear 214 are fixedly mounted at both ends of the drive shaft 213, respectively. Three active bevel gears 211 are fixedly mounted on the main shaft 1, all three active bevel gears 211 meshing with the first intermediate bevel gear 212. The second intermediate bevel gear 214 meshes with the passive bevel gear 215. The passive bevel gear 215 is fixedly mounted on the disk shaft 216, and the other end of the disk shaft 216 is fixedly connected to the disk 22.
[0022] The recording paper mechanism 4 includes recording paper 41, a paper tray 42, and an electric paper winding mechanism 43. The paper tray is located below the fixed plate. The recording paper is pulled upwards from the paper tray, extending upwards from between the fixed plate, the slider, and the recording pen to the electric paper winding mechanism. The electric paper winding mechanism can adopt a common structure in the prior art, the purpose of which is to pull the recording paper upwards at a uniform speed. The structure of this embodiment is as follows: The electric paper winding mechanism includes a paper winding mechanism fixing frame, an active roller, a passive roller, and a motor. The motor drives the active roller to rotate. A gear is mounted on the central shaft of the active roller, and a gear is also mounted on the central shaft of the passive roller. The two gears mesh, and the active roller drives the passive roller to rotate. The recording paper passes between the active roller and the passive roller.
[0023] This application features a recording paper mechanism on the upper and lower parts of the right-side fixed plate. After the recording paper is pulled out, it adheres tightly to the fixed plate and moves upwards at a constant speed, guided by an electric paper-winding mechanism above the fixed plate. The position of the recording paper is within the movement range of the recording pen on the right side of the slider. During the movement of the recording paper, it is equivalent to a change in the time axis. The spindle rotation speed is controlled by a motor, and the recording paper movement speed is controlled by the electric paper-winding mechanism, making it more flexible and convenient.
[0024] The three single-phase AC demonstration devices are equipped with recording pens of yellow, green, and red respectively. The discs are made of transparent material. For ease of observation and intuitive visualization, the three-color pens are selected to correspond to the three-phase AC markings, and the corresponding discs are made of transparent material. The vertical shaft on the disc is used to simulate the windings of different phase electromagnetic coils, and also uses the corresponding yellow, green, and red colors.
[0025] The operating procedure of the three-phase AC power demonstration device for electrical engineering teaching and training in this application is as follows:
[0026] 1. Preparation: The operator pulls the recording paper out of the paper tray, passes it between the fixed plate, the slider and the recording pen, extends it upwards, and then passes it between the active roller and the passive roller.
[0027] 2. Motor start: Start the motor that drives the main shaft and the motor that drives the active roller and the passive roller.
[0028] 3. Working Process: The main shaft drives three discs to rotate via three drive shaft assemblies. The rotation of the discs drives the vertical shaft on the discs to rotate. The vertical shaft drives the slider to slide linearly left and right on the fixed plate via a connecting rod. The left and right movement of the slider causes the colored recording pen at the end to move left and right on the recording paper. At the same time, the recording paper moves upward under the action of the electric paper winding mechanism. Therefore, the three recording pens draw a sinusoidal graph of three-phase sinusoidal alternating current on the recording paper.
[0029] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art, inspired by this description, design similar structures and implementations to the above embodiments without departing from the technical essence of the present invention, such designs should fall within the protection scope of the present invention.
Claims
1. A three-phase alternating current demonstration device for electrical engineering teaching and training, characterized in that: The device includes a main shaft, a single-phase AC power demonstration device, a fixed plate, and a recording paper mechanism. There are three single-phase AC power demonstration devices, each comprising a drive shaft assembly, a disc, a connecting rod, a slider, a fixed block, and a recording pen. The main shaft is connected to the disc via the drive shaft assembly. A vertical shaft is fixed on the disc, and the vertical shaft is rotatably connected to the connecting rod. The other end of the connecting rod is rotatably connected to the slider. The slider has a long groove in its center, and the fixed block is positioned within this groove and fixed to the fixed plate. The slider slides back and forth on the fixed plate relative to the fixed block. The other end of the slider has a mounting hole into which the recording pen is inserted and secured with bolts. The recording paper of the recording paper mechanism is positioned between the fixed plate and the recording pen. The vertical shafts on the three discs are spatially separated by 120 degrees.
2. The three-phase AC power demonstration device for electrical engineering teaching and training according to claim 1, characterized in that: The drive shaft assembly includes an active bevel gear, a first intermediate bevel gear, a drive shaft, a second intermediate bevel gear, a passive bevel gear, and a disc shaft. The first intermediate bevel gear and the second intermediate bevel gear are fixedly mounted at both ends of the drive shaft, respectively. Three active bevel gears are fixedly mounted on the main shaft. All three active bevel gears mesh with the first intermediate bevel gear. The second intermediate bevel gear meshes with the passive bevel gear. The passive bevel gear is fixedly mounted on the disc shaft, and the other end of the disc shaft is fixedly connected to the disc.
3. The three-phase AC power demonstration device for electrical engineering teaching and training according to claim 1, characterized in that: The recording paper mechanism includes recording paper, a paper tray, and an electric paper winding mechanism. The paper tray is located below the fixed plate. The recording paper is pulled upward from the paper tray and extends upward from between the fixed plate, the slider, and the recording pen to the electric paper winding mechanism. The electric paper winding mechanism includes a paper winding mechanism frame, a drive roller, a driven roller, and a motor. The motor drives the drive roller to rotate. A gear is mounted on the central shaft of the drive roller, and a gear is also mounted on the central shaft of the driven roller. The two gears mesh with each other, and the drive roller drives the driven roller to rotate. The recording paper passes between the drive roller and the driven roller.
4. The three-phase AC power demonstration device for electrical engineering teaching and training according to claim 1, characterized in that: The three single-phase AC demonstration devices are equipped with recording pens in yellow, green, and red, respectively.
5. A three-phase AC power demonstration device for electrical engineering teaching and training according to claim 1, characterized in that: The disk is made of a transparent material.