CN115184660A - Train traction motor leakage current detection method and bearing damage assessment system - Google Patents
Train traction motor leakage current detection method and bearing damage assessment system Download PDFInfo
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- CN115184660A CN115184660A CN202210615630.4A CN202210615630A CN115184660A CN 115184660 A CN115184660 A CN 115184660A CN 202210615630 A CN202210615630 A CN 202210615630A CN 115184660 A CN115184660 A CN 115184660A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/04—Bearings
- G01M13/045—Acoustic or vibration analysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
Abstract
The invention provides a train traction motor leakage current detection method and a bearing damage evaluation system, wherein the method comprises the steps of obtaining the running speed of a train and the input current of a traction motor under the current working condition; determining the frequency of leakage current of a traction motor under the current working condition according to the running speed of the train; and determining the amplitude of the leakage current of the traction motor under the current working condition according to the input current of the traction motor. The leakage current is determined through the running speed of the train and the input current of the traction motor, the existing train test can be realized under the condition that the train is not disassembled, and therefore the leakage current of the traction motor under each working condition is accurately determined.
Description
Technical Field
The application belongs to the technical field of leakage current detection, and particularly relates to a train traction motor leakage current detection method and a bearing damage assessment system.
Background
The traction motor generates leakage current due to coupling, induction and other factors, and meanwhile, leakage current loops are formed inside and outside the motor. When leakage current flows through components such as a motor bearing, a coupling, a gear box and the like, the electric erosion influence is generated on a contact tooth surface, and the aging of the components is accelerated.
Because the disassembly difficulty of the train in actual operation is higher, the size of the leakage current is difficult to determine under the condition that a current sensor is not arranged between the gear, the coupler and the motor. In the prior art, leakage current detection can be realized in a simulation experiment mode, but a certain error often exists between the leakage current obtained through simulation and actual leakage current.
Disclosure of Invention
In view of this, the invention provides a train traction motor leakage current detection method and a bearing damage evaluation system, and aims to solve the problem of low detection precision of the leakage current in the prior art.
The first aspect of the embodiment of the invention provides a train traction motor leakage current detection method, which comprises the following steps:
acquiring the running speed of a train and the input current of a traction motor under the current working condition;
determining the frequency of leakage current of a traction motor under the current working condition according to the running speed of the train;
and determining the amplitude of the leakage current of the traction motor under the current working condition according to the input current of the traction motor.
The second aspect of the embodiment of the invention provides a train traction motor leakage current detection method, which comprises the following steps:
the data acquisition module is used for acquiring the running speed of the train and the input current of the traction motor under the current working condition;
the first calculation module is used for determining the frequency of leakage current of the traction motor under the current working condition according to the running speed of the train;
and the second calculation module is used for determining the amplitude of the leakage current of the traction motor under the current working condition according to the input current of the traction motor.
A third aspect of the embodiments of the present invention provides a detection apparatus, including a memory, a processor, and a computer program stored in the memory and operable on the processor, wherein the processor implements the steps of the train traction motor leakage current detection method according to the first aspect when executing the computer program.
A fourth aspect of the embodiments of the present invention provides a computer-readable storage medium, where a computer program is stored, and the computer program, when executed by a processor, implements the steps of the train traction motor leakage current detection method according to the first aspect.
A fifth aspect of the embodiments of the present invention provides a train traction motor bearing damage evaluation system, which is characterized by including: the device comprises a test bearing, a programmable current source, a vibration sensor and a control device;
the control device is used for executing the following steps:
obtaining leakage currents of train traction motors corresponding to various working conditions;
controlling the test bearing to operate under each working condition and controlling the programmable current source to emit the simulated leakage current which is the same as the leakage current corresponding to each working condition;
the vibration sensor is used for detecting the vibration displacement of the test bearing and reporting the vibration displacement to the control device;
the control device is also used for determining and evaluating the damage of the test bearing according to the vibration displacement;
the leakage current of the train traction motor under each working condition is determined according to the train traction motor leakage current detection method of the first aspect.
The train traction motor leakage current detection method and the bearing damage evaluation system provided by the embodiment of the invention comprise the steps of obtaining the running speed of a train and the input current of a traction motor under the current working condition; determining the frequency of leakage current of a traction motor under the current working condition according to the running speed of the train; and determining the amplitude of the leakage current of the traction motor under the current working condition according to the input current of the traction motor. The leakage current is determined through the running speed of the train and the input current of the traction motor, the existing train test can be realized under the condition that the train is not disassembled, and therefore the leakage current of the traction motor under each working condition is accurately determined.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a flowchart illustrating an implementation of a method for detecting leakage current of a train traction motor according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a train traction motor bearing damage assessment system provided by an embodiment of the invention;
FIG. 3 is a schematic structural diagram of a system for evaluating damage to a bearing of a traction motor of a train according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a train traction motor leakage current detection device provided in an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a detection apparatus provided in an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
With the continuous development of power electronic technology, the switching performance of the PWM frequency converter is continuously improved, and the dynamic and static control performance of a driving motor of the PWM frequency converter is also obviously improved. However, as the switching frequency of the PWM converter becomes higher, the problem caused by the common-mode voltage output by the converter becomes more serious. For example, the common mode voltage induces a high amplitude shaft voltage on the motor shaft and forms a bearing current, which causes damage to the motor bearings and shortens the service life of the motor. The problem of electric corrosion of traction motor bearings, couplings and the like is completely researched in a simulation and theoretical analysis mode, and electric corrosion damage of leakage current to the motor bearings is theoretically evaluated, but the electric corrosion damage of the leakage current to the motor bearings is not comprehensive and large errors may exist in the simple theoretical evaluation. The damage test of the motor bearing is mostly mechanical damage, and the test of the motor bearing electric corrosion damage is lacked. If the electric corrosion damage of the motor bearing needs to be accurately evaluated, the leakage current of the traction motor needs to be accurately measured.
Since the leakage current flowing through the bearing cannot be directly measured, an indirect measurement method is generally adopted in the prior art, namely the leakage current of the bearing is indirectly measured by measuring the leakage current (coupling leakage current) from a rotating shaft of the motor to the gearbox.
But the space between the coupling and the gear box is very narrow, and the size is different compared with the conventional test of a test bench. And because the existing vehicle test is adopted, the vehicle cannot be disassembled, and the existing vehicle does not have a device and a position for specially installing the sensor, the installation of the coupling leakage current sensor is extremely difficult, and the detection and measurement mode is difficult to realize. In addition, because the train vibrates greatly in the running process, the measuring parts are easy to fall off in the measuring mode, and the safe running of the train is influenced.
The invention provides a train traction motor leakage current detection method, which can be used for determining leakage current through the running speed of a train and the input current of a traction motor, and realizing the current test without disassembling the train, thereby accurately determining the leakage current of the traction motor under various working conditions.
Fig. 1 is a flowchart of implementing a method for detecting leakage current of a train traction motor according to an embodiment of the present invention. As shown in fig. 1, in some embodiments, a train traction motor leakage current detection method includes:
and S101, acquiring the running speed of the train and the input current of the traction motor under the current working condition.
In this embodiment, the running speed of the train and the input current of the traction motor may be obtained from a vehicle-mounted control terminal of the train, or may be obtained from a driving dispatching center on the ground, which is not limited herein. The method comprises the steps of obtaining the running speed and the input current of a traction motor in real time during each current vehicle test, recording the working condition of the current vehicle test, and determining the leakage current under each working condition after traversing all the working conditions. The working conditions of the train can be divided according to acceleration, such as acceleration, deceleration and constant speed, or according to speed grades, such as 200km/h, 250km/h and 300km/h, or according to both the acceleration condition and the speed grade, which is not limited herein.
And S102, determining the leakage current frequency of the traction motor under the current working condition according to the running speed of the train.
Since the leakage current is caused by the common-mode voltage output by the frequency converter, the frequency of the frequency converter is in direct proportion to the rotating speed of the motor, and the speed of the train is in direct proportion to the rotating speed of the motor, the calculation of the leakage current frequency of the traction motor can be realized by detecting the running speed of the train in the embodiment.
S103, determining the amplitude of the leakage current of the traction motor under the current working condition according to the input current of the traction motor.
The essence of the leakage current is induced current formed by three-phase current loaded on the motor in a loop of a gear-coupler-motor, so that the load of the leakage current is necessarily influenced by the input current of the traction motor, and therefore in the embodiment, the calculation of the leakage current amplitude of the traction motor can be realized by detecting the input current of the traction motor.
In this embodiment, the leakage current is determined through the running speed of the train and the input current of the traction motor, and the current test can be realized without disassembling the train, so that the leakage current of the traction motor under each working condition is accurately determined.
In some embodiments, S102 may include:
and determining the frequency of the leakage current of the traction motor under the current working condition according to the mechanical parameters, the running speed and the wheel parameters of the train of the traction motor.
In this embodiment, the rotation speed of the train traction motor may be determined according to the operation speed and the wheel parameter of the train, and the frequency of the leakage current may be determined according to the rotation speed of the train traction motor and the mechanical parameter.
In some embodiments, the mechanical parameters of the wheel include a number of traction motor pole pairs, a number of gear box large gear teeth, a number of gear box small gear teeth. The wheel parameter of the train is the wheel diameter. The frequency of the leakage current of the traction motor under the current working condition is determined according to the following formula:
wherein f is the frequency of leakage current, v is the running speed, p is the number of pole pairs of the traction motor, and n 1 For the number of large gear teeth of the gear box, n 2 The number of teeth of the pinion of the gear box is d, and the wheel diameter of the wheel is d.
In some embodiments, S103 may include:
determining three-phase common-mode current according to the input current;
and determining the amplitude of the leakage current of the traction motor under the current working condition according to the three-phase common-mode current and the electrical parameters of the traction motor.
In some embodiments, the electrical parameters of the traction motor include: coupling capacitance between the stator winding of the traction motor and the casing, coupling capacitance between the stator winding of the traction motor and the rotor, coupling capacitance between the rotor of the traction motor and the casing, and equivalent capacitance of a bearing of the traction motor. The input current of the traction motor includes phase A current, phase B current and phase C current. The amplitude of the leakage current of the traction motor under the current working condition is determined according to the following formula:
wherein, I b Is the magnitude of the leakage current, C wf For coupling capacitance between stator winding and casing of traction motor, C wr For coupling capacitance between stator winding and rotor of traction motor, C rf Is a coupling capacitor between the rotor and the casing of the traction motor, C b The equivalent capacitance is a traction motor bearing, and I is a three-phase common-mode current;
wherein I = I A +I B +I C ，I A For phase A current, I B Phase B current, I C The phase C current.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by functions and internal logic of the process, and should not limit the implementation process of the embodiments of the present invention in any way.
Fig. 2 is a schematic structural diagram of a system for evaluating damage to a bearing of a traction motor of a train according to an embodiment of the present invention. As shown in fig. 2, in some embodiments, a train traction motor bearing damage assessment system includes: a test bearing 21, a programmable current source 22, a vibration sensor 23 and a control device 24;
the control device 24 is configured to perform the following steps:
acquiring leakage currents of train traction motors corresponding to various working conditions;
controlling the test bearing 21 to run under each working condition and controlling the programmable current source 22 to emit the same simulated leakage current corresponding to each working condition;
the vibration sensor 23 is used for detecting the vibration displacement of the test bearing 21 and reporting the vibration displacement to the control device 24;
the control device 24 is also used for determining and evaluating the damage of the test bearing 21 according to the vibration displacement;
the leakage current of the train traction motor under each working condition is determined according to the train traction motor leakage current detection method shown in any one of the embodiments.
The following describes, by way of an implementation example, operation steps of components in a train traction motor bearing damage evaluation system, but the implementation example is not limited thereto.
Step 1, determining a division rule of an experimental working condition. The division rule of the experimental condition is input into the control device 24 by the experimenter.
The high-speed motor train unit is subjected to three sections of acceleration, uniform speed and deceleration in sequence in the running process. By grouping the three sections into one period, the whole high-speed motor train unit operation process is formed by a plurality of periods. Therefore, in the implementation example, the period of three speed stages can be taken as a test condition, and the corresponding leakage current working condition and the rotating speed of the motor bearing are taken as test working conditions. The motor bearing load adopts no-load operation. The test conditions are shown in the following table:
TABLE 1 test condition table
| Working conditions | Acceleration (km/h) | Uniform speed (km/h) | Speed reduction (km/h) | Corresponding rotational speed r.min -1 |
| 1 | 0～300 | 300 | 300～0 | 0～1730 |
| 2 | 0～250 | 250 | 250～0 | 0～1442 |
| 3 | 0～200 | 200 | 200～0 | 0～1153 |
And 2, responding to an instruction input by an experimenter, selecting an experimental working condition by the control device 24, and acquiring the leakage current corresponding to the experimental working condition.
In this embodiment, the detection device may measure the leakage current under each working condition by using the train traction motor leakage current detection method as described in any one of the above embodiments, and upload the leakage current to the corresponding network platform or server, and when the control device 24 performs damage assessment, the leakage current corresponding to the experimental working condition may be obtained from the network platform or server, or the leakage current corresponding to the experimental working condition may be directly obtained from the detection device, which is not limited herein.
And 3, determining the type of the test bearing 21 according to the type of the motor bearing used by the motor train unit during the current train test, and determining the number of the test bearings 21 according to the leakage current working condition number.
The motor bearings used by the high-speed motor train unit are mostly double-row tapered roller motor bearings and double-row cylindrical roller motor bearings, and the double-row tapered roller motor bearings can be adopted as test objects in the implementation example. In order to avoid accidental errors and comparison, 4 motor bearings are adopted in each test working condition, wherein 3 motor bearings are used for carrying out an electric corrosion test, and 1 motor bearing is used for carrying out a non-leakage current loading comparison test.
And 4, determining a test performance index and a corresponding evaluation method according to the failure performance index of the motor bearing.
Once the motor bearing is subjected to electric corrosion damage, the roller path and the rolling body can be subjected to surface damage and lubricant aging, and accordingly vibration of the motor bearing is aggravated. Therefore, in the step, the vibration displacement of the motor bearing and the failure duration are used as performance indexes, and the failure duration is the time when the vibration displacement of the motor bearing reaches a limit value. And testing the failure duration of each group of three motor bearings under three groups of working conditions under the same limit value. If there is an outlier, the test is repeated. If the abnormal point does not exist, the average value of the failure time of the three motor bearings is taken as the failure time under the working condition. And evaluating the influence of the electric erosion damage generated by the leakage current on the motor bearing and the influence of the leakage current with different amplitude frequencies on the electric erosion damage of the motor bearing according to the failure duration and the vibration displacement.
And step 5, the control device 24 sends corresponding control parameters to the programmable current source 22 according to the leakage current corresponding to the experimental working condition, so that the programmable current source 22 loads the simulated leakage current, which is the same as the leakage current corresponding to the experimental working condition, to the experimental bearing 21.
The simulation working conditions required by the leakage current are more, and the current is not constant but continuously changes along with the time in the loading process. Therefore, conventional current sources do not meet the experimental requirements. The present invention thus employs the programmable current source 22 and the control device 24 to form the leakage current loading device. In this embodiment, the vibration sensor 23 may be a vibration acceleration sensor, which forms a feedback link to collect vibration displacement and feed back the vibration displacement to the control device 24. When the vibration displacement is larger than the limit value, the central control equipment sends out a stop command, and the programmable current source stops loading the leakage current.
And 5, selecting a performance index sensor and an upper computer, and compiling a software system.
In the motor bearing electric corrosion damage test process, the test bearing 21 is in the high-speed operation process, so the sensor is not suitable for being directly installed on the motor bearing. Performance index vibration displacement cannot be measured directly. The invention adopts an indirect measurement method, can utilize a vibration acceleration sensor to measure the vibration acceleration of the motor bearing, and obtains the vibration displacement of the motor bearing through double integration. The vibration sensor is mounted on the left platform of the test bearing 21.
In this embodiment, the performance index sensor for evaluating damage and the vibration sensor for the feedback unit may be the same device.
And 6, mounting the test bearing 21 on a motor bearing leakage current test research platform, and mounting the performance index sensor on the test platform.
In this step, can utilize original screw hole to install experimental bearing 21 in test research platform, guarantee simultaneously that good contact between motor bearing and the platform avoids grease, dust etc. to lead to the fact the influence to electric conductive property. The vibration sensor is bonded to the left platform of the test bearing 21.
And 7, loading the set working condition, tracking and monitoring the performance index change of the test bearing 21, and recording.
In the step, the test can be sequentially carried out according to the working condition sequence of 200km/h, 250km/h and 300km/h, the software system tracks, detects and displays the vibration displacement of the test bearing 21, and records the failure duration when the vibration displacement of the test bearing 21 reaches a limit value.
And 8, evaluating the damage of the leakage current to the motor bearing according to an evaluation method.
In this step, the test bearing 21 and the comparison bearing under the same working condition may be taken and compared with each other for their vibration displacements at the time of failure. And disassembling the test bearing 21 and the comparison bearing, observing the number of the grooves of the inner ring and the outer ring of the motor bearing and measuring the depth of the grooves. And evaluating the influence of the electric erosion damage generated by the leakage current on the motor bearing according to the vibration displacement, the number of the groove stripes and the depth. And (3) comparing the failure duration of the three groups of test bearings 21 under the leakage current working condition, and evaluating the influence of the leakage currents with different amplitude frequencies on the motor bearing electric corrosion damage.
Fig. 3 is a schematic structural diagram of a system for evaluating damage to a bearing of a traction motor of a train according to another embodiment of the present invention. As shown in fig. 3, in some embodiments, the control device 24 includes a central control apparatus 31 and an upper computer 32;
the central control device 31 is used for acquiring the leakage current of the train traction motor corresponding to each working condition, controlling the test bearing 21 to operate under the simulated working condition and controlling the programmable current source 22 to emit the simulated leakage current which is the same as the leakage current corresponding to each working condition;
the vibration sensor 23 is used for detecting the vibration displacement of the test bearing 21 and reporting the vibration displacement to the central control device 31 and the upper computer 32;
the upper computer 32 is used for determining and evaluating the damage of the test bearing 21 according to the vibration displacement;
the central control device 31 is also arranged to modify the analogue leakage current emitted by the programmable current source 22 in dependence on the vibration displacement.
In this embodiment, the central control device 31 may adopt a single chip microcomputer, an MCU, or the like, and the upper computer 32 may adopt a terminal device such as a desktop computer, a notebook, a mobile phone, or the like, which is not limited herein. The invention adopts a measurement and control system software LabVIEW development platform to carry out software design, and realizes data processing, data display and data recording.
In some embodiments, the system further comprises a current sensor 33;
the current sensor 33 is used for detecting the actual current loaded on the test bearing 21 and reporting the actual current to the central control device 31;
the central control device 31 is also arranged to modify the simulated leakage current emitted by the programmable current source 22 in dependence on the actual current.
In this embodiment, the leakage current loading method specifically includes: at the start of the test, initial conditions are set and sent to the control device 24. The control device 24 generates control parameters for controlling the programmable current source to generate a leakage current under corresponding operating conditions.
In this embodiment, the leakage current can be measured by using an electromagnetic induction type current sensor, and the leakage current can be fixed on the test platform through the mounting threaded hole. When the leakage current is a periodic current, the programmable current source 22 applies the leakage current to the test bearing 21 in a cyclic loading manner. The current sensor 33 and the vibration acceleration sensor monitor the magnitude of the loading leakage current and the vibration displacement in real time and feed back the magnitude to the central control device 31. When the difference between the actual loading leakage current fed back by the current sensor 33 and the set leakage current is large, the central control device 31 adjusts the control parameter to reduce the deviation. Wherein the vibration displacement feedback priority is greater than the current feedback priority.
Fig. 4 is a schematic structural diagram of a train traction motor leakage current detection device provided in an embodiment of the present invention. In some embodiments, the train leakage current traction motor leakage current detection device 4 includes:
the data acquisition module 410 is used for acquiring the running speed of the train and the input current of the traction motor under the current working condition;
the first calculating module 420 is configured to determine, according to the running speed of the train, a frequency of a leakage current of the traction motor under a current working condition;
the second calculation module 430 is configured to determine an amplitude of a leakage current of the traction motor under the current operating condition according to the input current of the traction motor.
Optionally, determining the frequency of the leakage current of the traction motor under the current working condition according to the running speed of the train includes:
and determining the frequency of the leakage current of the traction motor under the current working condition according to the mechanical parameters, the running speed and the wheel parameters of the train of the traction motor.
Optionally, the mechanical parameters of the wheel include the number of pole pairs of the traction motor, the number of teeth of a large gear of the gear box, and the number of teeth of a small gear of the gear box; the wheel parameter of the train is the wheel diameter; the frequency of the leakage current of the traction motor under the current working condition is determined according to the following formula:
wherein f is the frequency of leakage current, v is the running speed, p is the number of pole pairs of the traction motor, and n 1 For the number of large gear teeth of the gear box, n 2 The number of teeth of the pinion of the gear box is d, and the wheel diameter of the wheel is d.
Optionally, determining the amplitude of the leakage current of the traction motor under the current working condition according to the input current of the traction motor, including:
determining three-phase common-mode current according to the input current;
and determining the amplitude of the leakage current of the traction motor under the current working condition according to the three-phase common-mode current and the electrical parameters of the traction motor.
Optionally, the electrical parameters of the traction motor include: coupling capacitance between a traction motor stator winding and a machine shell, coupling capacitance between the traction motor stator winding and a rotor, coupling capacitance between a traction motor rotor and the machine shell and equivalent capacitance of a traction motor bearing; the input current of the traction motor comprises A phase current, B phase current and C phase current; the amplitude of the leakage current of the traction motor under the current working condition is determined according to the following formula:
wherein, I b Is the magnitude of the leakage current, C wf For coupling capacitance between stator winding and casing of traction motor, C wr For coupling capacitance between stator winding and rotor of traction motor, C rf Coupling capacitance between the rotor and the casing of the traction motor, C b The current is equivalent capacitance of a traction motor bearing, and I is three-phase common-mode current;
wherein I = I A +I B +I C ，，I A For phase A current, I B Phase B current, I C The phase C current.
The train traction motor leakage current detection device provided by the embodiment can be used for executing the method embodiment, the implementation principle and the technical effect are similar, and the embodiment is not repeated herein.
Fig. 5 is a schematic diagram of a detection apparatus provided in an embodiment of the present invention. As shown in fig. 5, a detection apparatus 5 according to an embodiment of the present invention includes: a processor 50, a memory 51 and a computer program 52 stored in the memory 51 and executable on the processor 50. The processor 50, when executing the computer program 52, implements the steps in the above-described embodiments of the train traction motor leakage current detection method, such as the steps 201 to 203 shown in fig. 2. Alternatively, the processor 50, when executing the computer program 52, implements the functions of the various modules/units in the system embodiments described above, such as the functions of the modules 410 to 430 shown in fig. 4.
Illustratively, the computer program 52 may be partitioned into one or more modules/units, which are stored in the memory 51 and executed by the processor 50 to implement the present invention. One or more of the modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 52 in the detection device 5.
The detection device 5 may be a single chip microcomputer, an MCU, a desktop computer, a notebook, a palm computer, or other computing devices. The terminal may include, but is not limited to, a processor 50, a memory 51. It will be appreciated by those skilled in the art that fig. 5 is merely an example of the detection device 5 and does not constitute a limitation of the detection device 5, and may include more or less components than those shown, or some components may be combined, or different components, e.g. the terminal may further include input output devices, network access devices, buses, etc.
The Processor 50 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 51 may be an internal storage unit of the detection device 5, such as a hard disk or a memory of the detection device 5. The memory 51 may also be an external storage device of the detection device 5, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like provided on the detection device 5. Further, the memory 51 may also include both an internal storage unit of the detection device 5 and an external storage device. The memory 51 is used for storing computer programs and other programs and data required by the terminal. The memory 51 may also be used to temporarily store data that has been output or is to be output.
The embodiment of the invention provides a computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, the steps in the train traction motor leakage current detection system embodiment are realized.
The computer-readable storage medium stores a computer program 52, the computer program 52 includes program instructions, and when the program instructions are executed by the processor 50, all or part of the processes in the method of the embodiments are implemented, or the program instructions are implemented by the computer program 52 in hardware, the computer program 52 may be stored in a computer-readable storage medium, and when the computer program 52 is executed by the processor 50, the steps of the method embodiments may be implemented. The computer program 52 comprises, among other things, computer program code, which may be in the form of source code, object code, an executable file or some intermediate form. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. disk, removable hard disk, magnetic diskette, optical disk, computer Memory, read-Only Memory (ROM), random Access Memory (RAM), electrical carrier wave signal, telecommunications signal, software distribution medium, etc. It should be noted that the computer readable medium may include any suitable increase or decrease as required by legislation and patent practice in the jurisdiction, for example, in some jurisdictions, computer readable media may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The computer readable storage medium may be an internal storage unit of the terminal of any of the foregoing embodiments, for example, a hard disk or a memory of the terminal. The computer readable storage medium may also be an external storage device of the terminal, such as a plug-in hard disk provided on the terminal, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like. Further, the computer-readable storage medium may also include both an internal storage unit and an external storage device of the terminal. The computer-readable storage medium is used for storing computer programs and other programs and data required by the terminal. The computer-readable storage medium may also be used to temporarily store data that has been output or is to be output.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules, so as to perform all or part of the functions described above. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the description of each embodiment has its own emphasis, and reference may be made to the related description of other embodiments for parts that are not described or recited in any embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the technical solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal and method may be implemented in other ways. For example, the above-described apparatus/terminal embodiments are merely illustrative, and for example, a module or a unit may be divided into only one logical function, and may be implemented in other ways, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may also be implemented in the form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method according to the embodiments of the present invention may also be implemented by a computer program instructing related hardware, and the computer program may be stored in a computer readable storage medium, and when executed by a processor, the computer program may implement the steps of the above-described embodiments of the method. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. disk, removable hard disk, magnetic disk, optical disk, computer Memory, read-Only Memory (ROM), random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution media, and the like. It should be noted that the computer-readable medium may contain suitable additions or subtractions depending on the requirements of legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer-readable media excludes electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A train traction motor leakage current detection method is characterized by comprising the following steps:
acquiring the running speed of the train and the input current of a traction motor under the current working condition;
determining the frequency of leakage current of a traction motor under the current working condition according to the running speed of the train;
and determining the amplitude of the leakage current of the traction motor under the current working condition according to the input current of the traction motor.
2. The train traction motor leakage current detection method according to claim 1, wherein determining the frequency of the leakage current of the traction motor under the current working condition according to the running speed of the train comprises:
and determining the frequency of the leakage current of the traction motor under the current working condition according to the mechanical parameters of the traction motor, the running speed and the wheel parameters of the train.
3. The train traction motor leakage current detection method according to claim 2, wherein the mechanical parameters of the wheel include the number of pole pairs of the traction motor, the number of teeth of a large gear of the gear box, and the number of teeth of a small gear of the gear box; the wheel parameter of the train is the wheel diameter; the frequency of the leakage current of the traction motor under the current working condition is determined according to the following formula:
wherein f is the frequency of the leakage current, v is the running speed, p is the number of pole pairs of the traction motor, and n 1 For the gear case large gear teeth number, n 2 And d is the wheel diameter of the wheel.
4. The train traction motor leakage current detection method according to claim 1, wherein determining the magnitude of the leakage current of the traction motor under the current working condition according to the input current of the traction motor comprises:
determining three-phase common-mode current according to the input current;
and determining the amplitude of the leakage current of the traction motor under the current working condition according to the three-phase common-mode current and the electrical parameters of the traction motor.
5. The train traction motor leakage current detection method according to claim 4, wherein the electrical parameters of the traction motor comprise: coupling capacitance between a traction motor stator winding and a machine shell, coupling capacitance between the traction motor stator winding and a rotor, coupling capacitance between a traction motor rotor and the machine shell and equivalent capacitance of a traction motor bearing; the input current of the traction motor comprises A-phase current, B-phase current and C-phase current; the amplitude of the leakage current of the traction motor under the current working condition is determined according to the following formula:
wherein, I b Is the magnitude of said leakage current, C wf Is a coupling capacitance, C, between the stator winding of the traction motor and the casing wr Is the coupling capacitance between the stator winding and the rotor of the traction motor, C rf Is a coupling capacitance between the rotor and the casing of the traction motor, C b The equivalent capacitance of the traction motor bearing is I, and the three-phase common-mode current is I;
wherein I = I A +I B +I C ，I A For the phase of current A, I B For the phase B current, I C The C-phase current.
6. A detection apparatus comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor when executing the computer program implements the steps of the train traction motor leakage current detection method according to any one of claims 1 to 5 above.
7. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program, which when executed by a processor, implements the steps of the train traction motor leakage current detection method according to any one of claims 1 to 5 above.
8. A train traction motor bearing damage assessment system, comprising: the device comprises a test bearing, a programmable current source, a vibration sensor and a control device;
the control device is used for executing the following steps:
obtaining leakage currents of train traction motors corresponding to various working conditions;
controlling the test bearing to run under each working condition and controlling the programmable current source to generate a simulated leakage current which is the same as the leakage current corresponding to each working condition;
the vibration sensor is used for detecting the vibration displacement of the test bearing and reporting the vibration displacement to the control device;
the control device is also used for determining and evaluating the damage of the test bearing according to the vibration displacement;
the train traction motor leakage current detection method is characterized in that the train traction motor leakage current under each working condition is determined according to the train traction motor leakage current detection method of any one of claims 1 to 5.
9. The train traction motor bearing damage assessment system according to claim 8, wherein said control device comprises a central control device and an upper computer;
the central control equipment is used for acquiring the leakage current of the train traction motor corresponding to each working condition, controlling the test bearing to run under the simulated working condition and controlling the programmable current source to emit the simulated leakage current which is the same as the leakage current corresponding to each working condition;
the vibration sensor is used for detecting the vibration displacement of the test bearing and reporting the vibration displacement to the central control equipment and the upper computer;
the upper computer is used for determining and evaluating the damage of the test bearing according to the vibration displacement;
and the central control equipment is also used for correcting the simulated leakage current emitted by the programmable current source according to the vibration displacement.
10. The train traction motor bearing damage assessment system of claim 9, wherein said system further comprises a current sensor;
the current sensor is used for detecting the actual current loaded on the test bearing and reporting the actual current to the central control equipment;
and the central control equipment is also used for correcting the simulated leakage current emitted by the programmable current source according to the actual current.
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| CN202210615630.4A CN115184660A (en) | 2022-05-31 | 2022-05-31 | Train traction motor leakage current detection method and bearing damage assessment system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116760225A (en) * | 2023-05-23 | 2023-09-15 | 小米汽车科技有限公司 | Method and device for treating shaft electric damage, vehicle and storage medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116760225A (en) * | 2023-05-23 | 2023-09-15 | 小米汽车科技有限公司 | Method and device for treating shaft electric damage, vehicle and storage medium |
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