Three-phase asynchronous motor winding head and tail end tester

Abstract

A three-phase asynchronous motor winding head and tail end tester comprises a box body (1), and a power supply module used for supplying power, a binding post module used for providing an equipment interface, a voltmeter display unit used for displaying detection data and an operation conversion control unit are arranged in the box body (1). The device has the advantages of improving the test efficiency, remarkably shortening the test time due to the quick test function, and improving the motor maintenance and production efficiency. A hardware structure and an induced voltage processing algorithm are optimized, so that the reliability of a test result is ensured, and motor faults caused by misjudgment are reduced.

Description

Technical Field

[0001] This utility model relates to the field of electric motor testing and diagnostic equipment, specifically to a tester for the start and end ends of a three-phase asynchronous motor winding. Background Technology

[0002] Currently, three-phase asynchronous motors, as a type of AC motor, are widely used in most industrial and agricultural production machinery, such as mining machinery, light industrial machinery, petrochemical machinery, and agricultural and sideline product processing machinery, as well as household appliances and various power tools, due to their advantages such as simple structure, convenient manufacturing and maintenance, reliable operation, and low cost. Therefore, ensuring the normal operation of three-phase asynchronous motors is crucial for maintaining the smooth progress of production activities.

[0003] The limitations of traditional testing methods: Traditional testing of the winding start and end points of three-phase asynchronous motors mainly relies on manual experience and simple testing tools. This method has the following limitations: ① Long testing time: Manual testing often requires multiple trials and verifications, consuming a lot of time. ② Low accuracy: Manual testing is easily affected by factors such as operating experience and environmental interference, leading to inaccurate test results. ③ Complex operation: For complex or large three-phase asynchronous motors, the testing process is cumbersome and it is difficult to ensure consistency.

[0004] With the continuous improvement of automation and intelligence in industrial production, the requirements for testing the start and end terminals of three-phase asynchronous motor windings are also increasing. To improve testing efficiency, reduce testing costs, and ensure the accuracy of test results, developing an efficient and accurate testing instrument is particularly important. Utility Model Content

[0005] The purpose of this invention is to address the above-mentioned shortcomings by providing a tester for the start and end ends of a three-phase asynchronous motor winding.

[0006] This utility model includes a housing, inside which are housed a power supply module for power supply, a terminal block module for providing equipment interfaces, a voltmeter display unit for displaying test data, and an operation conversion control unit.

[0007] The power module is electrically connected to the terminal block module, the voltmeter display unit, and the operation conversion control unit via wires. The operation conversion control unit is responsible for the processing and command control of the selection of the three-phase winding connection mode.

[0008] The power module includes a power input interface, a power switch, a test switch, and an autotransformer. The power input interface, power switch, and test switch are arranged sequentially on the cover of the enclosure, while the autotransformer is installed at the bottom of the enclosure.

[0009] The enclosure cover has a through hole in the middle. The adjusting rod of the autotransformer extends out of the enclosure through the through hole, and the control panel is installed on the adjusting rod of the autotransformer.

[0010] The terminal block module includes U1 terminal block, U2 terminal block, V1 terminal block, V2 terminal block, W1 terminal block and W2 terminal block installed on the enclosure cover.

[0011] The voltmeter display unit includes a test voltmeter and an autotransformer voltmeter, which are respectively mounted on the cover of the enclosure and located above the autotransformer.

[0012] The operation switching control unit includes a U-phase switch, a V-phase switch, and a W-phase switch, which are arranged in order from top to bottom on the cover of the enclosure.

[0013] The enclosure contains a set of power fuses and contactors. The power input interface is electrically connected to the autotransformer via the contactor and the set of power fuses.

[0014] The enclosure cover is equipped with an enclosure grounding terminal.

[0015] The advantages of this utility model are:

[0016] 1. Improved testing efficiency: The rapid testing function significantly shortens testing time, improving the efficiency of motor repair and production.

[0017] 2. Improve test accuracy: Optimize hardware structure and induced voltage processing algorithm to ensure the reliability of test results and reduce motor failures caused by misjudgment.

[0018] 3. Simplified operation process: The user-friendly interface design and simple operation process make the tester easier to promote and use, and lower the technical threshold for operators.

[0019] 4. Promote industry development: The widespread use of this tester will help improve the overall technical level of the electric motor industry and promote the industry's automation and intelligent development.

[0020] 5. Wide range of applications in training and teaching: By providing intuitive teaching tools, enhancing practical skills, promoting the integration of theoretical knowledge with practical operation, improving teaching efficiency and effectiveness, and promoting innovation in teaching models, the quality and effectiveness of training and teaching can be further improved. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the box lid opening of this utility model.

[0022] Figure 2 This is a schematic diagram of the box cover structure of this utility model.

[0023] Figure 3 This is the power input schematic diagram of this utility model.

[0024] Figure 4 This is a schematic diagram of the test phase circuit of this utility model.

[0025] Figure 5 This is a schematic diagram of the circuit where the first and last ends of this utility model are connected.

[0026] Figure 6 This is a schematic diagram of the circuit where the first and last ends of this utility model are connected.

[0027] Figure 7 This is a schematic diagram of the U-phase operation conversion principle of this utility model.

[0028] Figure 8 This is a schematic diagram of the V-phase operation conversion principle of this utility model.

[0029] Figure 9 This is a schematic diagram of the W-phase operation conversion principle of this utility model. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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 some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] In the description of the embodiments of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, if terms such as "first" or "second" appear in the description of this invention, they are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0035] As shown in the attached drawings, this utility model includes a housing 1, which contains a power supply module for power supply, a terminal block module for providing equipment interfaces, a voltmeter display unit for displaying detection data, and an operation conversion control unit.

[0036] The power module is electrically connected to the terminal block module, the voltmeter display unit, and the operation conversion control unit via wires. The operation conversion control unit is responsible for the processing and command control of the selection of the three-phase winding connection mode.

[0037] The power module includes a power input interface 2, a power switch 3, a test switch 4, and an autotransformer 5. The power input interface 2, the power switch 3, and the test switch 4 are arranged in sequence on the cover of the enclosure 1, and the autotransformer 5 is installed at the bottom inside the enclosure 1.

[0038] The enclosure 1 has a through hole in the middle of the cover. The adjusting rod of the autotransformer 5 extends through the through hole to the outside of the enclosure 1. The control panel is installed on the adjusting rod of the autotransformer 5.

[0039] The terminal block module includes U1 terminal block 6, U2 terminal block 7, V1 terminal block 8, V2 terminal block 9, W1 terminal block 10 and W2 terminal block 11 installed on the cover of the enclosure 1.

[0040] The voltmeter display unit includes a test voltmeter 12 and an autotransformer voltmeter 13. The test voltmeter 12 and the autotransformer voltmeter 13 are respectively installed on the cover of the enclosure 1 and located above the autotransformer 5.

[0041] The operation switching control unit includes a U-phase switch 14, a V-phase switch 15, and a W-phase switch 16, which are arranged from top to bottom on the cover of the housing 1.

[0042] The enclosure 1 is equipped with a set of power fuses 17 and contactors 18. The power input interface 2 is electrically connected to the autotransformer 5 through the contactor 18 and the set of power fuses 17.

[0043] The enclosure 1 has an enclosure grounding terminal 19 on its cover. Example

[0044] As attached Figure 3 As shown, the power input interface 2 inputs AC 220V, which is adjusted to 12V-36V by the autotransformer 5. During testing, the U1 terminal 6, U2 terminal 7, V1 terminal 8, V2 terminal 9, W1 terminal 10, and W2 terminal 11 are connected to whichever phase is needed.

[0045] As attached Figure 4 , 5 As shown in Figure 6, terminals 6 and 7 of U1 are used as the power supply test phases. 12V-36V AC power is input through autotransformer 5. The voltage is indicated by autotransformer voltmeter 13. The other two phases are connected to terminals 8 and 9 of V1, and terminals 10 and 11 of W1 and W2.

[0046] First: When the first end and the last end are connected, the voltage indication of the test voltmeter 12 is zero (that is, V1 terminal 8 is connected to W1 terminal 10, and V2 terminal 9 is connected to W2 terminal 11).

[0047] Second: When the first and last terminals are connected, the voltage indicated by voltmeter 12 is 24V-72V (that is, V1 terminal 8 is connected to W2 terminal 11, and V2 terminal 9 is connected to W1 terminal 10). Example

[0048] As attached Figure 7 As shown, in conjunction with the following table:

[0049]

[0050] For the U-phase power supply test of the motor, the 12V to 36V of the autotransformer 5 is connected to phases U1 terminal 6 and U2 terminal 7. The connection of the start and end terminals of the three-phase winding is tested by switching the connection of V1 terminal 8, V2 terminal 9, W1 terminal 10, and W2 terminal 11 through the U-phase changeover switch 14. When the U-phase changeover switch 14 is in the 0-degree neutral position, it remains in the open state.

[0051] Secondary conversion diagram: When the U-phase conversion switch 14 is switched to the left position (90 degrees), nodes 1-2 of section one and nodes 3-4 of section two are connected, that is, V1 terminal 8 is connected to W1 terminal 10, and V2 terminal 9 is connected to W2 terminal 11. At this time, the test switch 4 is closed, and the indication of the test voltmeter 12 is observed, realizing the connection of the first and last terminals in Example 1.

[0052] When the U-phase changeover switch 14 is at a 90-degree right position, nodes 5-6 of the three sections are connected, meaning the beginning and end are connected. Test switch 4 is then closed, and the reading of voltmeter 12 is checked. This achieves the connection of the beginning and end terminals as in Example 1. When voltmeter 12 indicates zero volts, the beginning and end terminals are connected; when voltmeter 12 indicates 24 volts to 72 volts, the beginning and end terminals are connected.

[0053] Example 3: As shown in the attached document Figure 8 As shown,

[0054] Refer to the following table:

[0055]

[0056] For motor V-phase power supply testing, the 12V to 36V of autotransformer 5 is connected to V1 terminal 8 and V2 terminal 9. The connection of the first and last terminals of the three-phase winding is tested by switching the connection of U1 terminal 6, U2 terminal 7, W1 terminal 10 and W2 terminal 11 through V-phase changeover switch 15.

[0057] When the V-phase changeover switch 15 is in the 0-degree neutral position, it remains in the open state.

[0058] When the V-phase changeover switch 15 is switched to the left position (90 degrees), nodes 1-2 of section one and nodes 3-4 of section two are connected, i.e., terminal 10 of W1 is connected to terminal 6 of U1, and terminal 11 of W2 is connected to terminal 7 of U2. At this time, close the test switch 4 and observe the indication of the test voltmeter 12. This achieves the connection of the first and last terminals in Example 1. When the V-phase changeover switch 15 is switched to the right position (90 degrees), nodes 5-6 of section three are connected, i.e., the first and last terminals are connected. Close the test switch 4 and observe the indication of the test voltmeter 12. This achieves the connection of the first and last terminals in Example 1. When the test voltmeter 12 indicates zero volts, the first terminals are connected; when the test voltmeter 12 indicates 24 volts to 72 volts, the first and last terminals are connected.

[0059] Example 4: As shown in the appendix Figure 9 As shown,

[0060] Refer to the following table:

[0061]

[0062] For testing the W-phase power supply of the motor, the 12V to 36V of the autotransformer 5 is connected to the W1 terminal 10 and the W2 terminal 11. The connection of the start and end terminals of the three-phase winding is tested by switching the connection of the U1 terminal 6, U2 terminal 7, V1 terminal 8, and V2 terminal 9 through the W-phase changeover switch 16.

[0063] When the W-phase changeover switch 16 is in the 0-degree neutral position, it remains open. When the W-phase changeover switch 16 is switched to the left position (90 degrees), nodes 1-2 of section 1 and nodes 3-4 of section 2 are connected, i.e., V1 terminal 8 is connected to U1 terminal 6, and V2 terminal 9 is connected to U2 terminal 7. At this time, close the test switch 4 and observe the indication of the test voltmeter 12. This achieves the connection of the first and last terminals in Example 1. When the W-phase changeover switch 16 is switched to the right position (90 degrees), nodes 5-6 of section 3 are connected, i.e., the first and last terminals are connected. Close the test switch 4 and observe the indication of the test voltmeter 12. This achieves the connection of the first and last terminals in Example 1. When the test voltmeter 12 indicates zero volts, the first terminals are connected; when the test voltmeter 12 indicates 24 volts to 72 volts, the first and last terminals are connected.

[0064] Example 5: The W-phase changeover switch 16 is switched from position 0 to position V1U2. The voltage of the autotransformer 5 is adjusted to any point between 12V and 36V. It is observed that the reading on the autotransformer voltmeter 13 matches the output reading of the autotransformer 5. The W-phase changeover switch 16 is then switched from the zero position to the left 90-degree position. The reading on the test voltmeter 12 is observed. If the test voltmeter 12 reads 0 volts, then the three-phase asynchronous motors V1 and U2 connected to terminals 8 (V1) and 7 (U2) are connected at the same start (end) terminals. If the test voltmeter 12 reads twice the reading on the autotransformer voltmeter 13, then V1 and U2 are connected at the start and end of one phase. The W-phase changeover switch 16 is then switched back to position V1U1. At this time, the voltage reading displayed on the test voltmeter 12 is different from that at position V1U2. If V1U2 displays 0V, then V1U1 displays twice the voltage of autotransformer 5; if V1U2 displays twice the voltage of autotransformer 5, then V1U1 displays 0V.

[0065] Based on the above test results, operate the V-phase changeover switch 15 and the W-phase changeover switch 16. By doing so, the start and end points of the U-phase, V-phase, and W-phase of the three-phase asynchronous motor can be tested.

[0066] As described above, this utility model provides a three-phase asynchronous motor winding start and end tester that can function normally and accurately test the start and end ends of the three-phase asynchronous motor windings. It offers a more efficient, accurate, and easy-to-use testing tool for the repair, maintenance, production, and training of three-phase asynchronous motors.

Claims

1. A three-phase asynchronous motor winding end-to-end tester characterized in that The utility model relates to a three-phase winding connection mode selection device, including box (1), be provided with power module for power supply, wiring post module for providing equipment interface, voltmeter display unit for showing detection data and operation conversion control unit in box (1), The power module is electrically connected with the wiring post module, the voltmeter display unit and the operation conversion control unit by wires, and the operation conversion control unit is used for processing and instruction control of three-phase winding connection mode selection.

2. A three-phase induction motor winding end-turn tester according to claim 1, characterized in that, The power module includes a power input interface (2), a power switch (3), a test switch (4) and a autotransformer (5), the power input interface (2), the power switch (3) and the test switch (4) are sequentially arranged and installed on the box cover of the box (1), and the autotransformer (5) is installed at the bottom of the box (1).

3. A three-phase induction motor winding end-turn tester according to claim 2, characterised in that, A through hole is formed in the middle of the box cover of the box (1), and the adjusting rod of the autotransformer (5) extends out of the box (1) through the through hole, and an operation disc is installed on the adjusting rod of the autotransformer (5).

4. A three-phase induction motor winding end-turn tester according to claim 3, characterized in that, The wiring post module includes U1 wiring post (6), U2 wiring post (7), V1 wiring post (8), V2 wiring post (9), W1 wiring post (10) and W2 wiring post (11) installed on the box cover of the box (1).

5. A three-phase induction motor winding end-turn tester according to claim 4, characterised in that, The voltmeter display unit includes a test voltmeter (12) and an autotransformer voltmeter (13), and the test voltmeter (12) and the autotransformer voltmeter (13) are respectively installed on the box cover of the box (1) and located above the autotransformer (5).

6. A three-phase induction motor winding end-turn tester according to claim 5, characterized in that, The operation conversion control unit includes a U-phase conversion switch (14), a V-phase conversion switch (15) and a W-phase conversion switch (16), and the U-phase conversion switch (14), the V-phase conversion switch (15) and the W-phase conversion switch (16) are sequentially arranged and installed on the box cover of the box (1) from top to bottom.

7. A three-phase induction motor winding end-turn tester according to claim 6, characterised in that, A group of power fuses (17) and contactors (18) are arranged in the box (1), and the power input interface (2) is electrically connected with the autotransformer (5) through the contactors (18) and the group of power fuses (17).

8. A three-phase induction motor winding end-turn tester according to claim 7, characterized in that, The box cover of the box (1) is provided with a box grounding terminal (19).

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