A test device for the stator magnetic field of a three-phase asynchronous motor

Abstract

This utility model discloses a stator magnetic field testing device for a three-phase asynchronous motor, comprising a rotating rod and a conductor section. The conductor section is configured as a hollow cylindrical structure, with a connecting hole extending through its axis. The rotating rod is rotatably connected within the connecting hole, allowing the conductor section to rotate freely around the rotating rod. The conductor is made of copper, and the rotating rod is made of insulating material. This utility model requires no complex operating procedures or professional technical knowledge; ordinary maintenance personnel and even beginners can easily master its use, greatly lowering the testing threshold. Furthermore, its simple manufacturing process significantly reduces costs compared to professional testing equipment, making it suitable for widespread application in various maintenance locations and on-site testing. By observing the movement of the cylindrical conductor after the motor is energized, the correctness of the motor wiring can be determined in a short time, resulting in high testing efficiency and relatively accurate results, effectively identifying common wiring errors.

Description

Technical Field

[0001] This utility model relates to the field of motor testing technology, specifically to a stator magnetic field testing device for a three-phase asynchronous motor. Background Technology

[0002] Determining whether the stator wiring of a three-phase asynchronous motor is correct is an important task during the manufacturing, repair, and testing of electric motors.

[0003] Currently, common testing methods typically require specialized testing equipment, such as comprehensive motor testers. These devices are not only expensive but also complex to operate, demanding skilled technicians. For small repair shops or on-site rapid testing scenarios, carrying and using these devices is extremely inconvenient and can easily damage them. Furthermore, some of these traditional testing methods may require disassembling motor components or connecting additional external circuits, which is not only time-consuming and labor-intensive but may also cause potential damage to the motor.

[0004] In view of the above-mentioned defects, the creator of this utility model has finally obtained this utility model after a long period of research and practice. Utility Model Content

[0005] To address the aforementioned technical deficiencies, the present invention provides a three-phase asynchronous motor stator magnetic field testing device comprising a rotating rod and a conductor section. The conductor section is configured as a hollow cylindrical structure, and a connecting hole is provided through the axis of the conductor section. The rotating rod is rotatably connected within the connecting hole, allowing the conductor section to rotate freely around the rotating rod. The conductor is made of copper, and the rotating rod is made of insulating material.

[0006] Preferably, a detection strip is fixedly disposed on the outer surface of the conductor portion. The detection strip includes an end section and a middle section. The end sections extend radially at both ends of the conductor portion. The middle section is disposed on the outer circular surface of the conductor portion and is arranged parallel to the axis of the guide portion. The two end sections are respectively fixedly disposed at both ends of the middle section.

[0007] Preferably, the detection strip is provided with a fluorescent coating on its exterior.

[0008] Preferably, multiple detection strips are provided, and each detection strip is evenly distributed in a ring around the axis of the conductor portion.

[0009] Preferably, the rotating rod includes a connecting section, a hand-held section, and a through section. The connecting section and the hand-held section are respectively disposed at both ends of the through section. The connecting section, the hand-held section, and the through section are coaxial cylindrical structures. The outer circular surface of the connecting section is provided with threads, and the connecting section is threadedly connected to a mounting nut. The cross-sectional diameter of the hand-held section is larger than the cross-sectional diameter of the through section.

[0010] Preferably, the cross-sectional diameter of the connecting section is less than or equal to the cross-sectional diameter of the through section.

[0011] Compared with existing technologies, the advantages of this utility model are as follows: This utility model does not require complicated operating procedures and professional technical knowledge. Ordinary maintenance personnel and even beginners can easily master the usage method, which greatly reduces the testing threshold. At the same time, the manufacturing process is simple, and the cost is greatly reduced compared with professional testing equipment, making it suitable for widespread application in various maintenance sites and on-site testing. By observing the movement state of the cylindrical conductor after the motor is energized, it is possible to determine whether the motor wiring is correct in a short time. The testing efficiency is high, and the results are relatively accurate, which can effectively detect common wiring errors. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural view of the stator magnetic field testing device for the three-phase asynchronous motor.

[0013] Figure 2 This is a structural view of the rotating rod.

[0014] The numbers in the diagram represent:

[0015] 1-Rotating rod; 2-Conductor section; 3-Detection strip; 4-Mounting nut; 11-Connecting section; 12-Handheld section; 13-Passing section; 31-End section; 32-Connecting section. Detailed Implementation

[0016] The above-mentioned and other technical features and advantages of this utility model will be described in more detail below with reference to the accompanying drawings.

[0017] Example 1

[0018] like Figure 1 As shown, Figure 1 This is a three-dimensional view of the structure of the three-phase asynchronous motor stator magnetic field test device.

[0019] The stator magnetic field testing device for a three-phase asynchronous motor according to this utility model includes a rotating rod 1 and a conductor part 2. The conductor part 2 is a hollow cylindrical structure. A connecting hole is provided through the axis of the conductor part 2. The rotating rod 1 is rotatably connected in the connecting hole, so that the conductor part 2 can rotate around the rotating rod 1. The conductor is made of copper, and the rotating rod 1 is made of insulating material.

[0020] Generally, a detection strip 3 is fixedly provided on the outer surface of the conductor part 2. The detection strip 3 includes an end section 31 and an intermediate section 32. The end section 31 extends radially at both ends of the conductor part 2, and the intermediate section 32 is provided on the outer circular surface of the conductor part 2. The intermediate section 32 is parallel to the axis of the guide part. The two end sections 31 are respectively fixedly provided at both ends of the intermediate section 32. When the conductor part 2 rotates around the rotating rod 1, the rotation of the conductor part 2 can be directly observed through the detection strip 3, thereby determining whether the wiring is correct.

[0021] Preferably, the detection strip 3 is provided with a fluorescent coating on its exterior. The fluorescent coating can significantly improve the identification of abnormal movements and reduce the false judgment rate.

[0022] Generally, multiple detection strips 3 are provided, and each detection strip 3 is evenly distributed in a ring around the axis of the conductor portion 2.

[0023] The specific usage process is as follows: after power is off, hold the rotating rod 1 and place the conductor part 2 into the stator cavity of the motor, ensuring that it is centered and that the conductor part 2 is coaxially arranged with the stator cavity; apply three-phase AC power to the motor and observe the rotation of the conductor part 2. If it rotates regularly, it indicates that the wiring is correct and the rotating magnetic field is uniform; if it vibrates abnormally or does not rotate, it indicates that there is a phase sequence error, short circuit or open circuit.

[0024] Specifically, the wiring can be determined to be correct by observing the regular rotation of the detection bar 3. When there is an abnormality in the wiring, such as the irregular oscillation of the conductor 2, the detection bar 3 will rotate intermittently. This may indicate an open circuit in the B-phase winding. After repair, if the conductor 2 resumes regular rotation, it indicates that the repair was successful.

[0025] This invention requires no complicated operating procedures or professional technical knowledge. Ordinary maintenance personnel and even beginners can easily master its use, greatly reducing the testing threshold. At the same time, the manufacturing process is simple, and the cost is significantly reduced compared to professional testing equipment, making it suitable for widespread application in various maintenance sites and on-site testing. By observing the movement of the cylindrical conductor after the motor is energized, it is possible to determine whether the motor wiring is correct in a short time. The testing efficiency is high, and the results are relatively accurate, effectively identifying common wiring errors.

[0026] Example 2

[0027] like Figure 2 As shown, Figure 2 This is a structural view of the rotating rod.

[0028] The rotating rod 1 includes a connecting section 11, a handheld section 12, and a through section 13. The connecting section 11 and the handheld section 12 are respectively located at both ends of the through section 13. The connecting section 11, the handheld section 12, and the through section 13 are coaxial cylindrical structures. The outer surface of the connecting section 11 is threaded, and a mounting nut 4 is threaded onto the connecting section 11. The cross-sectional diameter of the handheld section 12 is larger than that of the through section 13. Thus, the boss formed by the connecting section 11 and the handheld section 12, along with the mounting nut 4, fixes the position of the conductor part 2 on the rotating rod 1. The handheld section 12 facilitates the operator's handheld positioning of the conductor part 2 during the testing process.

[0029] Generally, the cross-sectional diameter of the connecting segment 11 is less than or equal to the cross-sectional diameter of the through segment 13, so that the connecting segment 11 can pass through the connecting hole, and the rotating rod 1 and the conductor part 2 can be installed and connected.

[0030] In this embodiment, a Y2-315M-10 three-phase asynchronous motor is tested. The motor has a rated power of 55kW, a rated voltage of 380V, a stator core length of 280 mm, and an inner diameter of 390 mm. The rotating rod 1 is made of ceramic fiber or polytetrafluoroethylene and has a length of 325 mm. The diameter of the connecting section 11 is 10 mm, and the diameter of the handheld section 12 is 20 mm to accommodate the stator inner diameter (390 mm) and operating space of the Y2-315M-10 motor. The conductor part 2 is made of highly conductive copper, with an outer diameter of 150 mm, an inner diameter of 15 mm, and a length of 200 mm to ensure matching and centering with the stator inner cavity.

[0031] The above description is merely a preferred embodiment of the present utility model and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present utility model, all of which will fall within the protection scope of the present utility model.

Claims

1. A stator magnetic field testing device for a three-phase asynchronous motor, characterized in that, It includes a rotating rod and a conductor section. The conductor section is a hollow cylindrical structure. A connecting hole is provided through the axis of the conductor section. The rotating rod is rotatably connected in the connecting hole so that the conductor section can rotate freely around the rotating rod. The conductor is made of copper, and the rotating rod is made of insulating material.

2. The three-phase asynchronous motor stator magnetic field testing device according to claim 1, characterized in that, A detection strip is fixedly provided on the outer surface of the conductor portion. The detection strip includes an end section and a middle section. The end sections extend radially at both ends of the conductor portion. The middle section is disposed on the outer circular surface of the conductor portion and is arranged parallel to the axis of the conductor portion. The two end sections are respectively fixedly disposed at both ends of the middle section.

3. The three-phase asynchronous motor stator magnetic field testing device according to claim 2, characterized in that, The detection strip is coated with a fluorescent coating.

4. The three-phase induction motor stator magnetic field testing apparatus of claim 2, wherein The detection strips are provided in multiple ways, and each detection strip is evenly distributed in a ring around the axis of the conductor portion.

5. The three-phase induction motor stator magnetic field testing apparatus of claim 2 wherein, The rotating rod includes a connecting section, a handheld section, and a through section. The connecting section and the handheld section are respectively disposed at both ends of the through section. The connecting section, the handheld section, and the through section are coaxial cylindrical structures. The outer circular surface of the connecting section is provided with threads, and the connecting section is threadedly connected to a mounting nut. The cross-sectional diameter of the handheld section is larger than the cross-sectional diameter of the through section.

6. The three-phase induction motor stator field test apparatus of claim 5 wherein, The cross-sectional diameter of the connecting section is less than or equal to the cross-sectional diameter of the through section.

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