Device and method for detecting reverse rotation of motor of frame-controlled diesel locomotive

Abstract

The invention provides a device and a method for detecting reverse rotation of a motor of a frame-controlled diesel locomotive. The device comprises a host display module, a detection module and a sensor module, the host display module is a user interface of the detection device; the host display module is connected with the detection module in a wireless transmission mode; the host display module analyzes the low-frequency current pulse signals through the pulse width modulation technology and Fourier transform of the data detected at the next stage and by matching with an analysis circuit, judges the respective phase sequence, and finally displays the judgment result; the detection module comprises three independently arranged detection units; the three independently arranged detection units respectively correspond to the shaft motors in different directions; the sensor module is connected with the detection module through a wire harness. According to the detection method, faults caused by wiring errors of the traction motor in the locomotive debugging stage can be fundamentally and effectively detected and eliminated, so that the test efficiency is improved, and the accident potential of the frame control diesel locomotive is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of motor detection methods, and in particular to a motor reversal detection method for a frame-controlled diesel locomotive based on low-frequency current pulse signal analysis. Background Art

[0002] In 2021, locomotive FXN3B0001 completed factory commissioning. During the trial run, the 6A system reported an alarm of increased temperature at position 2 of axis 1, accompanied by a large amount of thick smoke and open flames. After the on-site personnel extinguished the fire, the load locomotive was returned to the factory without fire. After returning to the factory to check the motor, it was found that the phase sequence of the three-phase motor of axis 1 was opposite to that of the other five axes. It was confirmed that the three-phase connector of the motor of axis 1 was plugged in reverse, and the corresponding wire numbers of U, V, and W were not plugged in according to the schematic diagram, which led to the reverse burning accident of the motor.

[0003] The main cause of the accident was that the FXN3B locomotive adopted a frame-controlled transmission mode, with one traction inverter controlling three traction motors. This is different from the axle-controlled locomotive, which can cut off the traction inverters corresponding to different motors to conduct steering confirmation tests on each axle motor separately. In routine tests of frame-controlled locomotives, only the steering of three traction motors on a single bogie can be confirmed at the same time. If the phase sequence of one traction motor is reversed and the other two are connected correctly, the locomotive will still run in the command direction. During routine dynamic tests in the factory, the locomotive speed was low and the traction motor current was small, and the protection value (phase current: 1800A) could not be triggered. For frame-controlled locomotives to confirm the steering of the traction motor, only the other traction motor cables on the traction inverter can be removed, leaving only one motor for running steering confirmation, and the recovery process can only be judged by manually observing the line sequence, and it is impossible to completely ensure that the cable is restored correctly. The frame-controlled locomotives of our company, starting from the HXN3 locomotive, have not been able to thoroughly verify the steering of the traction motor through routine tests in the factory, which led to the above accident.

[0004] According to incomplete statistics, in recent years, various accidents have caused the traction motor of the locomotive to burn out during the debugging stage, causing direct or indirect losses of nearly 2 million yuan to the company. This has not only increased production costs and affected the normal progress of production, but also laid hidden dangers for production safety.

[0005] Prior art 1 is a DC motor forward and reverse detection circuit and motor system [1]", the method is to build two unidirectional conduction circuits, use the difference in the forward and reverse current of the DC motor, and judge the conduction state of the circuit by the on-off status of the two unidirectional conduction circuits. The device applied in the first technology is only suitable for the detection of DC motors, while the locomotive traction motor is an AC asynchronous motor, which has different working characteristics from the DC motor and is not suitable for AC motors; the device needs to change the original locomotive electrical wiring and install the corresponding circuit module. It greatly increases the manufacturing cost and violates the original intention of conducting motor forward and reverse detection through a convenient method when the locomotive is tested before leaving the factory. It also greatly increases the economic cost and is not suitable for promotion.

[0006] The second prior art is "A test device and method for determining the rotation direction of the traction motor of an EMU", and the application number is: 202211141884.3. The method is to start the switch to make the traction motor output traction current, collect different traction motor phase sequences and process them into digital logic signals 0 / 1 output, and can perform a determination test on the rotation direction of the traction motor of the EMU through logical comparison. The use scenario of technology two is the EMU. The control method of the EMU is similar to that of the axle-controlled diesel locomotive, both of which are axle-controlled methods. This control method can detect the phase sequence of the motor corresponding to each traction inverter separately. This method only optimizes the detection process applicable to the EMU, and it is also possible to select the traction inverter corresponding to different motors to verify the function. It is not suitable for the phase sequence detection of the traction motor of the frame-controlled diesel locomotive.

[0007] References:

[0008] [1] Li Guoliang, Sun Yang, Li Linjun. Forward and reverse detection circuit and motor system of DC motor [P]. Beijing: CN214473799U, 2021-10-22. Summary of the invention

[0009] According to the technical problems mentioned in the above background technology, a method for detecting the reverse rotation of a motor of a controlled diesel locomotive based on the analysis of a low-frequency current pulse signal is provided. The technical means adopted by the present invention are as follows:

[0010] A motor reversal detection device for a frame-controlled diesel locomotive comprises: a host display module, a detection module and a sensor module;

[0011] The host display module is a user interface of the detection device; the host display module is connected to the detection module through a wireless transmission mode; the host display module uses pulse width modulation technology and Fourier transform and an analysis circuit to analyze the low-frequency current pulse signal of the next-level detection data, judge the respective phase sequences, and finally display the judgment results;

[0012] The detection module comprises: three independently arranged detection units; the three independently arranged detection units correspond to shaft motors in different directions respectively;

[0013] The sensor module is connected to the detection module via a wiring harness.

[0014] Furthermore, the detection unit includes: a collection subunit, a calculation subunit, a wireless network card subunit and a battery subunit;

[0015] The acquisition subunit obtains the current pulse signal through the sensor module, performs preliminary conditioning and amplification on the current pulse signal, and then sends the processed signal to the operation subunit through the data line; the operation subunit performs algorithm analysis on the signal, and transmits the calculation result in the form of a digital signal to the wireless network card subunit through the data line; the wireless network card subunit converts the signal into a format suitable for wireless transmission, and sends the data to the host display module through the wireless antenna; the battery subunit provides a stable DC power supply for the detection module.

[0016] Furthermore, the detection unit is arranged at a position close to the traction motor.

[0017] Furthermore, each of the three independently arranged detection units corresponds to one motor, that is, the number of motors that can be detected is an integer multiple of 3.

[0018] Furthermore, the detection unit is an integrated package, that is, all electronic components and measuring components are arranged inside the test box, and only the test leads and the wireless antenna are outside.

[0019] Furthermore, the shell of the test box is made of alloy material; the shell of the test box is adsorbed on the bogie by magnetic adsorption.

[0020] Furthermore, the sensor module includes a sensor probe; the sensor probe, i.e., a phase line clamp, includes: a clamp, a braided copper tape arranged on the clamp, and a phase line connecting wire; a total of three phase line clamps are arranged corresponding to the three-phase cable, wherein the braided copper tape is wrapped around the cable and clamped by the clamp.

[0021] Furthermore, a phase line male plug is provided at the end of the phase line connecting wire, and the phase line male plug is inserted into a corresponding female plug on the inductive phase line signal detection unit.

[0022] Furthermore, the detection mode of the sensor module is clamp-type current detection, and the detection functions of the sensor module are phase sequence detection and phase loss detection.

[0023] The present invention also includes a method for detecting motor reversal of a frame-controlled diesel locomotive, comprising the following steps:

[0024] Step 1: The bogie-controlled diesel locomotive is equipped with two traction converters, each of which corresponds to a group of bogies with three traction motors each; cut off any group of traction converters through the locomotive's microcomputer system, and keep the other group of traction converters in operation;

[0025] Step 2: Connect the detection module and the host display module through wireless transmission mode; clamp the current acquisition sensors of each set of detection modules to the U, V, and W harnesses of the motor in sequence, and attach the acquisition modules to the locomotive bogie by magnetic attraction;

[0026] Step 3: The locomotive applies low-gear forward traction, so that the locomotive travels a certain distance in the predetermined forward direction, and then brakes to stop;

[0027] Step 4: The detection module collects the current pulse waveforms of the three motors and transmits them back to the host display module via wireless transmission;

[0028] Step 5: The host display module uses pulse width modulation technology and Fourier transform and an analytical circuit to compare and analyze the three groups of low-frequency current pulse signals to determine whether the pulse waveform consistency rate reaches 90%. If it reaches 90%, it is determined that the phase sequence of the three groups of motors is consistent; if it is less than 90%, it is determined that the phase sequence of the three groups of motors is inconsistent, and step 6 is executed to determine whether the wiring of each group of motors is correct;

[0029] Step 6: When the locomotive's driving direction is consistent with the predetermined direction and the three phase sequences are consistent, it is determined that the wiring of the three traction motors is correct; when the locomotive's driving direction is consistent with the predetermined direction, the two phase sequences are consistent and one phase sequence is opposite, then the wiring of the opposite traction motor is wrong; when the locomotive's driving direction is opposite to the predetermined direction, the two phase sequences are consistent and one phase sequence is opposite, then the wiring of the two consistent traction motors is wrong; when the locomotive's driving direction is opposite to the predetermined direction and the three phase sequences are consistent, it is determined that the wiring of the three traction motors is wrong;

[0030] Step 7: The host display module prompts the operator to make corrections or proceed to the next step;

[0031] Step 8: Use the locomotive's microcomputer system to cut off the traction inverter that has been put into use, and put in another set of traction inverters that have been cut off. Repeat steps 2 to 7 to perform judgment tests. If the corresponding three sets of traction motor connections are correct, the phase sequence detection test of the control locomotive is completed.

[0032] Furthermore, in step 3, the certain distance is 2 to 3 meters.

[0033] Compared with the prior art, the present invention has the following advantages:

[0034] The detection method of the present invention can effectively detect and eliminate faults in traction motors caused by wiring errors during the locomotive debugging stage, thereby increasing test efficiency, reducing potential accidents of controlled diesel locomotives, and increasing the company's economic benefits. It can save the company more than one million yuan in economic losses caused by wiring errors each year. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0036] Figure 1 The invention discloses a related structure of a motor reverse rotation detection device for a controlled diesel locomotive.

[0037] Figure 2 It is a schematic diagram of the input and output of the traction converter when the locomotive is performing motor reversal detection related operations. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0039] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0040] like Figures 1-2As shown, the present invention provides a motor reversal detection device for a frame-controlled diesel locomotive based on low-frequency current pulse signal analysis, comprising: a host display module, a detection module and a sensor module.

[0041] like Figure 1 As shown, the connection relationship between the sensor module, the detection module and the host display module is presented.

[0042] Sensor module: including sensor 1 (corresponding to U1), sensor 2 (corresponding to V1), sensor 3 (corresponding to W1), sensor 4 (corresponding to U2), sensor 5 (corresponding to V2), sensor 6 (corresponding to W2), sensor 7 (corresponding to U3), sensor 8 (corresponding to V3), sensor 9 (corresponding to W3). These sensors are distributed in different positions of the three-phase cable of the motor and are used for low-frequency pulse signals.

[0043] Detection module: It consists of three independent detection units, namely detection unit #1, detection unit #2 and detection unit #3. Each detection unit is connected to the corresponding sensor, for example, detection unit #1 is connected to sensor 1, sensor 2 and sensor 3. The current pulse signal obtained by the detection unit is converted into a digital signal.

[0044] Host display module: connected to the detection module wirelessly, used to receive data from the detection module and process and display it.

[0045] The host display module is the user interface of the detection device; the host display module is connected to the detection module through a wireless transmission mode; the host display module uses pulse width modulation technology and Fourier transform and an analysis circuit to analyze the low-frequency current pulse signal, determine the respective phase sequence, and finally display the judgment result;

[0046] The detection module includes: three independently arranged detection units; the three independently arranged detection units correspond to shaft motors in different directions respectively;

[0047] The sensor module is connected to the detection module through a wiring harness.

[0048] Furthermore, the detection unit includes: a collection subunit, a calculation subunit, a wireless network card subunit and a battery subunit.

[0049] The acquisition subunit uses the current pulse signal obtained by the sensor module to perform preliminary conditioning and amplification on it, and then sends the processed signal to the operation subunit through the data line; the operation subunit performs algorithm analysis on the signal, and the calculation result is transmitted to the wireless network card subunit in the form of a digital signal through the data line; the wireless network card subunit converts the signal into a format suitable for wireless transmission, and sends the data to the host display module through the wireless antenna; the battery subunit provides a stable DC power supply for the detection module.

[0050] Furthermore, the detection unit is arranged at a position close to the traction motor.

[0051] Furthermore, there are three independently arranged detection units, each detection unit corresponds to one motor, and the number of motors that can be detected is an integer multiple of three.

[0052] Furthermore, the detection unit is an integrated package, that is, all electronic components and measuring components are arranged inside the test box, and only the test leads and the wireless antenna are outside.

[0053] Furthermore, the shell of the test box is made of alloy material; the shell of the test box is adsorbed on the bogie by magnetic adsorption.

[0054] Furthermore, the sensor module includes a sensor probe; the sensor probe, i.e., a phase line clamp, includes: a clamp, a braided copper tape arranged on the clamp, and a phase line connecting wire; a total of three phase line clamps are arranged corresponding to the three-phase cable, wherein the braided copper tape is wrapped around the cable and clamped by the clamp.

[0055] Furthermore, a phase line male plug is provided at the end of the phase line connecting wire, and the phase line male plug is inserted into a corresponding female plug on the inductive phase line signal detection unit.

[0056] Furthermore, the detection mode of the sensor module is clamp-type current detection, and the detection functions of the sensor module are phase sequence detection and phase loss detection.

[0057] The present invention also includes a method for detecting motor reversal of a frame-controlled diesel locomotive based on low-frequency current pulse signal analysis, comprising the following steps:

[0058] Step 1: The bogie-controlled diesel locomotive is equipped with two traction converters, each of which corresponds to a group of bogies with three traction motors each; cut off any group of traction converters through the locomotive's microcomputer system, and keep the other group of traction converters in operation;

[0059] Step 2: Connect the detection module and the host display module through wireless transmission mode; clamp the current acquisition sensors of each set of detection modules to the U, V, and W harnesses of the motor in sequence, and attach the acquisition modules to the locomotive bogie by magnetic attraction;

[0060] Step 3: The locomotive applies low-gear forward traction, so that the locomotive travels a certain distance in the predetermined forward direction, and then brakes to stop;

[0061] Step 4: The detection module collects the current pulse waveforms of the three motors and transmits them back to the host display module via wireless transmission;

[0062] Step 5: The host display module uses pulse width modulation technology and Fourier transform with analytical circuit to compare and analyze the low-frequency current pulse signal to determine whether the pulse waveform consistency rate reaches 90%. If it reaches 90%, it is determined that the phase sequence of the three groups of motors is consistent; if it is less than 90%, it is determined that the phase sequence of the three groups of motors is inconsistent. Execute step 6 to determine whether the wiring of each group of motors is correct;

[0063] Step 6: When the locomotive's driving direction is consistent with the predetermined direction and the three phase sequences are consistent, it is determined that the wiring of the three traction motors is correct; when the locomotive's driving direction is consistent with the predetermined direction, the two phase sequences are consistent and one phase sequence is opposite, then the wiring of the opposite traction motor is wrong; when the locomotive's driving direction is opposite to the predetermined direction, the two phase sequences are consistent and one phase sequence is opposite, then the wiring of the two consistent traction motors is wrong; when the locomotive's driving direction is opposite to the predetermined direction and the three phase sequences are consistent, it is determined that the wiring of the three traction motors is wrong;

[0064] Step 7: The host display module prompts the operator to make corrections or proceed to the next step;

[0065] Step 8: Use the locomotive's microcomputer system to cut off the traction converter that has been put into use, and put in another set of traction converters that have been cut off. Repeat steps 2 to 7 to perform the judgment test. If the corresponding three sets of traction motor connections are correct, the phase sequence detection test of the control locomotive is completed. Figure 2 As shown, traction converter 1 and traction converter 2, overhead diesel locomotives usually use two sets of traction converters, which can be put into and removed separately, and each traction converter usually controls three sets of motors. Figure 2 The traction converter 2 is cut off and the traction converter 1 is put in. This indicates that during the detection process, the locomotive microcomputer system first performs phase sequence detection on the three groups of motors corresponding to the traction converter 1 according to the detection method, and then switches to the phase sequence detection of the traction converter 2. Figure 2 In the diagram, M1, M2, and M3 are marked to represent the different motors corresponding to traction converter 1, and U1, V1, W1, U2, V2, W2, U3, V3, and W3 are marked to represent the three-phase line connection points of these three groups of motors. These markings show the electrical connection relationship between the traction converter and the motor and between each other.

[0066] Furthermore, in step 3, the certain distance is 2 to 3 meters.

[0067] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0068] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0069] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0070] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0071] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0072] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A motor reversal detection device for a frame-controlled diesel locomotive, characterized in that: include: Host display module, detection module and sensor module; The host display module is a user interface of the detection device; The host display module is connected to the detection module via a wireless transmission mode; the host display module uses pulse width modulation technology and Fourier transform and an analysis circuit to analyze the low-frequency current pulse signal of the next-level detection data, determine the respective phase sequences, and finally display the judgment results; The detection module comprises: three independently arranged detection units; the three independently arranged detection units correspond to shaft motors in different directions respectively; The sensor module is connected to the detection module via a wiring harness.

2. The motor reversal detection device for a frame-controlled diesel locomotive according to claim 1, characterized in that: The detection unit includes: a collection subunit, a calculation subunit, a wireless network card subunit and a battery subunit; The acquisition subunit obtains the current pulse signal through the sensor module, performs preliminary conditioning and amplification on the current pulse signal, and then sends the processed signal to the operation subunit through the data line; the operation subunit performs algorithm analysis on the signal, and transmits the calculation result in the form of a digital signal to the wireless network card subunit through the data line; the wireless network card subunit converts the signal into a format suitable for wireless transmission, and sends the data to the host display module through the wireless antenna; the battery subunit provides a stable DC power supply for the detection module.

3. A motor reversal detection device for a frame-controlled diesel locomotive according to claim 1 or 2, characterized in that: The detection unit is arranged at a position close to the traction motor.

4. A motor reversal detection device for a frame-controlled diesel locomotive according to claim 1, 2 or 3, characterized in that: The three independently arranged detection units, each detection unit corresponds to one motor, that is, the number of motors that can be detected is an integer multiple of 3.

5. A motor reversal detection device for a frame-controlled diesel locomotive according to any one of claims 1 to 4, characterized in that: The detection unit is an integrated package, that is, all electronic components and measuring components are arranged inside the test box, and only the test leads and the wireless antenna are outside.

6. The motor reversal detection device for a frame-controlled diesel locomotive according to claim 5, characterized in that: The shell of the test box is made of alloy material; the shell of the test box is adsorbed on the bogie by magnetic adsorption.

7. The motor reversal detection device for a frame-controlled diesel locomotive according to claim 1, characterized in that: The sensor module includes a sensor probe; the sensor probe, i.e., a phase line clamp, includes: a clamp, a braided copper belt arranged on the clamp, and a phase line connecting wire; three phase line clamps are arranged corresponding to the three-phase cables, wherein the braided copper belt is wound around the cable and clamped by the clamp.

8. The motor reversal detection device for a frame-controlled diesel locomotive according to claim 7, characterized in that: The end of the phase line connecting wire is provided with a phase line male plug, and the phase line male plug is inserted into the corresponding female socket on the inductive phase line signal detection unit.

9. The motor reversal detection device for a frame-controlled diesel locomotive according to claim 7, characterized in that: The detection mode of the sensor module is clamp-type current detection, and the detection functions of the sensor module are phase sequence detection and phase loss detection.

10. A method for detecting motor reversal of a controlled diesel locomotive, characterized in that: The following steps are involved: Step 1: The bogie-controlled diesel locomotive is equipped with two traction converters, each of which corresponds to a group of bogies with three traction motors each; cut off any group of traction converters through the locomotive's microcomputer system, and keep the other group of traction converters in operation; Step 2: Connect the detection module and the host display module through wireless transmission mode; clamp the current acquisition sensors of each set of detection modules to the U, V, and W harnesses of the motor in sequence, and attach the acquisition module to the locomotive bogie by magnetic attraction; Step 3: The locomotive applies low-gear forward traction, so that the locomotive travels a certain distance in the predetermined forward direction, and then brakes to stop; Step 4: The detection module collects the current pulse waveforms of the three motors and transmits them back to the host display module via wireless transmission; Step 5: The host display module uses pulse width modulation technology and Fourier transform and an analytical circuit to compare and analyze the three groups of low-frequency current pulse signals to determine whether the pulse waveform consistency rate reaches 90%. If it reaches 90%, it is determined that the phase sequence of the three groups of motors is consistent; If it is less than 90%, it is determined that the phase sequence of the three motor groups is inconsistent, and step 6 is executed to determine whether the wiring of each motor group is correct; Step 6: When the locomotive's driving direction is consistent with the predetermined direction and the three phase sequences are consistent, it is determined that the wiring of the three traction motors is correct; when the locomotive's driving direction is consistent with the predetermined direction, the two phase sequences are consistent and one phase sequence is opposite, then the wiring of the opposite traction motor is wrong; when the locomotive's driving direction is opposite to the predetermined direction, the two phase sequences are consistent and one phase sequence is opposite, then the wiring of the two consistent traction motors is wrong; when the locomotive's driving direction is opposite to the predetermined direction and the three phase sequences are consistent, it is determined that the wiring of the three traction motors is wrong; Step 7: The host display module prompts the operator to make corrections or proceed to the next step; Step 8: Use the locomotive's microcomputer system to cut off the traction inverter that has been put into use, and put in another set of traction inverters that have been cut off. Repeat steps 2 to 7 to perform judgment tests. If the corresponding three sets of traction motor connections are correct, the phase sequence detection test of the control locomotive is completed.

11. A method for detecting motor reverse rotation of a frame-controlled diesel locomotive according to claim 10, characterized in that: The certain distance in step 3 is 2 to 3 meters.

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