Fault parameter determination method and device of permanent magnet motor

Abstract

The invention provides a fault parameter determination method and device of a permanent magnet motor, electronic equipment and a computer readable storage medium. The method comprises the steps of simulating at least one short-circuit fault type of the permanent magnet motor according to a stator structure of the permanent magnet motor to obtain a simulated fault motor; testing the simulated fault motor through a test platform; acquiring test parameters of the simulated fault motor in the test process; determining fault parameters of the permanent magnet motor according to the test parameters; wherein the fault parameters are used for carrying out fault control on the permanent magnet motor in combination with working parameters when the permanent magnet motor works; according to the invention, the fault parameters of the short-circuit fault process can be simulated for a single motor, so that accurate fault control can be carried out based on the accurate fault parameters.

Description

Technical Field

[0001] The present application relates to permanent magnet motor technology, and in particular to a method and device for determining fault parameters of a permanent magnet motor. Background Art

[0002] Permanent magnet motors have the advantages of high efficiency, simple structure, high reliability, small size, light weight and high power density, which make them perform well in many applications, especially in the field of rail transportation. Due to their unique structural characteristics, there is a back electromotive force during operation. Once a fault occurs, it is accompanied by great harm, easy spread and difficult diagnosis, which poses a serious threat to the performance and reliability of the motor. In serious cases, it may cause safety hazards such as frame fracture and fire.

[0003] At present, the fault parameters of motors are usually determined based on experience and parameters generated during actual operation. However, there are many types of motors, and empirical data cannot accurately reflect the actual faults of each motor, resulting in inaccurate motor fault control and causing great losses. Summary of the invention

[0004] The embodiments of the present application provide a method, device, electronic device and computer-readable storage medium for determining fault parameters of a permanent magnet motor, which can simulate the fault parameters of a short-circuit fault process for a single motor, so that accurate fault control can be performed based on accurate fault parameters.

[0005] The technical solution of the embodiment of the present application is implemented as follows:

[0006] The present application provides a method for determining fault parameters of a permanent magnet motor, including:

[0007] According to the stator structure of the permanent magnet motor, at least one short circuit fault type of the permanent magnet motor is simulated to obtain a simulated fault motor;

[0008] Testing the simulated fault motor via a test platform;

[0009] Collecting test parameters of the simulated fault motor during the test;

[0010] Determining fault parameters of the permanent magnet motor according to the test parameters;

[0011] The fault parameters are used to perform fault control on the permanent magnet motor in combination with the working parameters of the permanent magnet motor.

[0012] In the above scheme, the test parameters include multiple groups of sub-parameters, each group of sub-parameters includes a permanent magnet motor speed and a state parameter of the permanent magnet motor at the permanent magnet motor speed, and each group of sub-parameters corresponds to a different permanent magnet motor speed; determining the fault parameters of the permanent magnet motor according to the test parameters includes:

[0013] For each group of sub-parameters, determining the fault state parameter of the permanent magnet motor according to the corresponding state parameter;

[0014] According to the permanent magnet motor speed of each group of sub-parameters, the speed of each permanent magnet motor is associated with the corresponding fault state parameter;

[0015] A plurality of associated groups of permanent magnet motor rotation speeds and fault state parameters are determined as the fault parameters.

[0016] In the above scheme, the method further comprises:

[0017] During the operation of the permanent magnet motor, the operating parameters of the permanent magnet motor are obtained, wherein the operating parameters include operating speed and operating state parameters;

[0018] According to the working speed and the fault parameter, a speed range corresponding to the working speed is determined, wherein the upper limit value and the lower limit value of the speed range are both the permanent magnet motor speed included in the fault parameter;

[0019] Determine an upper limit permanent magnet motor speed corresponding to the upper limit value;

[0020] If the working state parameter reaches a fault state parameter associated with the upper limit permanent magnet motor speed, fault indication information for the permanent magnet motor is generated.

[0021] In the above scheme, the step of testing the simulated fault motor and collecting test parameters of the simulated fault motor during the test includes:

[0022] During the test, the speed of the permanent magnet motor is controlled to change from low to high;

[0023] When the speed of the permanent magnet motor changes from low to high, the speed and state parameters of the permanent magnet motor of the simulated fault motor are collected.

[0024] In the above scheme, the method further comprises:

[0025] When the state parameter of the simulated fault motor reaches a preset parameter value, the test on the simulated fault motor is stopped.

[0026] In the above solution, the simulated fault motor is provided with a sensor for detecting the state parameter.

[0027] In the above solution, the state parameter includes at least one of the following: current, voltage, bearing vibration parameter, bearing temperature and stator temperature.

[0028] In the above scheme, the simulated fault motor is connected to the ground wire of the test platform through a grounding cable, and the simulated fault motor is mechanically connected to the traction unit.

[0029] In the above scheme, the at least one short-circuit fault includes an inter-turn short-circuit fault, a two-phase short-circuit fault and a three-phase short-circuit fault.

[0030] The embodiment of the application provides a device for determining fault parameters of a permanent magnet motor, comprising:

[0031] A simulation module, used for simulating at least one short-circuit fault type of the permanent magnet motor according to the stator structure of the permanent magnet motor, to obtain a simulated fault motor;

[0032] A test module, used for testing the simulated fault motor through a test platform;

[0033] A collection module, used for collecting parameters of the simulated fault motor during the test process;

[0034] A determination module, used to determine the fault parameters of the permanent magnet motor according to the test parameters;

[0035] The fault parameters are used to perform fault control on the permanent magnet motor in combination with the working parameters of the permanent magnet motor.

[0036] An embodiment of the present application provides an electronic device, including:

[0037] A memory for storing executable instructions;

[0038] The processor is used to implement the method for determining fault parameters of the permanent magnet motor provided in the embodiment of the present application when executing the executable instructions stored in the memory.

[0039] An embodiment of the present application provides a computer-readable storage medium storing executable instructions for causing a processor to execute instructions to implement the method for determining fault parameters of a permanent magnet motor provided in the embodiment of the present application.

[0040] An embodiment of the present application provides a computer program product storing a computer program for implementing the method for determining fault parameters of a permanent magnet motor provided in the embodiment of the present application when executed by a processor.

[0041] The embodiment of the present application obtains a simulated fault motor by simulating at least one short-circuit fault type of the motor according to the stator structure of the motor; tests the simulated fault motor through a test platform; collects test parameters of the simulated fault motor during the test; determines the fault parameters of the motor according to the test parameters; wherein the fault parameters are used to perform fault control on the motor in combination with the working parameters of the motor when it is working, and can simulate the fault parameters of the short-circuit fault process for a single motor, so that accurate fault control can be performed based on accurate fault parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is an optional structural diagram of a system for determining fault parameters of a permanent magnet motor provided in an embodiment of the present application;

[0043] Figure 2 is an optional structural diagram of an electronic device provided in an embodiment of the present application;

[0044] Figure 3 This is an optional flow chart of a method for determining fault parameters of a permanent magnet motor provided in an embodiment of the present application;

[0045] Figure 4 is an optional schematic diagram of a fault simulation provided in an embodiment of the present application;

[0046] Figure 5A is an optional simulation schematic diagram of an inter-turn short circuit fault provided in an embodiment of the present application;

[0047] Figure 5B It is an optional simulation schematic diagram of a two-phase short circuit fault provided in an embodiment of the present application;

[0048] Figure 5C It is an optional simulation schematic diagram of a three-phase short circuit fault provided in an embodiment of the present application;

[0049] Figure 6 It is an optional simulation structure schematic diagram of a simulated faulty motor provided in an embodiment of the present application. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. The described embodiments should not be regarded as limiting the present application. All other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0051] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0052] In the following description, the terms "first\second\third" involved are merely used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can be interchanged with a specific order or sequence where permitted, so that the embodiments of the present application described here can be implemented in an order other than that illustrated or described here.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0054] In the related technology, the back EMF of the permanent magnet motor is simulated according to the permanent magnet motor model, and the reactance and resistance values ​​of the permanent magnet motor are calculated, and the theoretical value of the short-turn current during the operation of the permanent magnet motor is estimated based on the back EMF and reactance values; then the test external circuit is designed based on the theoretical value, and the test device is constructed; after completion, the permanent magnet motor is installed on the test bench to test the back EMF of a single-turn coil at different speeds of the permanent magnet motor; the resistance value is added to the external circuit to detect, and the short-turn current value of the coil is calculated after the external circuit is removed, and the maximum safe speed threshold of the permanent magnet motor test is determined based on the coil short-turn current limit, and finally the reverse short-turn current is detected after the resistance is removed.

[0055] However, it mainly conducts experimental analysis on turn-to-turn short-circuit current. In actual operation, turn-to-turn short-circuit faults are easily extended to phase-to-phase short-circuit faults. Once extended to phase-to-phase short-circuit, the system automatically cuts off traction, and the short-circuit current cannot be used for fault judgment. This method still has certain limitations in implementation.

[0056] Based on this, the embodiments of the present application provide a method, device, electronic device and computer-readable storage medium for determining fault parameters of a permanent magnet motor, which can simulate the fault parameters of a short-circuit fault process for a single motor, so that accurate fault control can be performed based on accurate fault parameters.

[0057] First, the fault parameter determination system of the permanent magnet motor provided in the embodiment of the present application is described. Figure 1 , Figure 1This is an optional structural diagram of a permanent magnet motor fault parameter determination system provided in an embodiment of the present application. To implement a permanent magnet motor fault parameter determination application, a control unit 101 is connected in communication with a simulated fault permanent magnet motor 102. The permanent magnet motor involved in the embodiment of the present application may be a permanent magnet motor. The control unit 101 may be implemented as a single chip microcomputer or a microcontroller.

[0058] Next, the electronic device for implementing the method for determining the fault parameters of the permanent magnet motor provided in the embodiment of the present application is described. Figure 2 , Figure 2 is an optional structural diagram of an electronic device 200 provided in an embodiment of the present application. In practical applications, the electronic device 200 can be implemented as Figure 1 The control unit 101 in the embodiment of the present invention is an electronic device. Figure 1 Taking the control unit 101 shown as an example, an electronic device for implementing the method for determining fault parameters of a permanent magnet motor according to an embodiment of the present application is described.

[0059] Figure 2 The electronic device 200 shown includes: at least one processor 201 and a memory 202. The various components in the electronic device 200 are coupled together via a bus system 203. It is understood that the bus system 203 is used to achieve connection and communication between these components. In addition to the data bus, the bus system 203 also includes a power bus, a control bus, and a status signal bus. However, for the sake of clarity, the bus system 203 is not described in detail. Figure 2 Various buses are labeled as bus system 203.

[0060] The processor 201 can be an integrated circuit chip with signal processing capabilities, such as a general-purpose processor, a digital signal processor (DSP), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc., where the general-purpose processor can be a microprocessor or any conventional processor, etc.

[0061] The memory 202 may be removable, non-removable, or a combination thereof. Exemplary hardware devices include solid-state memory, hard disk drives, optical disk drives, etc. The memory 202 may optionally include one or more storage devices that are physically remote from the processor 201.

[0062] The memory 202 includes a volatile memory or a non-volatile memory, and may also include both volatile and non-volatile memories. The non-volatile memory may be a read-only memory (ROM), and the volatile memory may be a random access memory (RAM). The memory 202 described in the embodiments of the present application is intended to include any suitable type of memory.

[0063] In some embodiments, the memory 202 can store data to support various operations, examples of which include programs, modules, and data structures, or subsets or supersets thereof. In the embodiment of the present application, the memory 202 stores an operating system 2021 and a permanent magnet motor-based fault parameter determination device 2022; specifically,

[0064] Operating system 2021, including system programs for processing various basic system services and performing hardware-related tasks, such as a framework layer, a core library layer, a driver layer, etc., for implementing various basic services and processing hardware-based tasks;

[0065] In some embodiments, the fault parameter determination device based on the permanent magnet motor provided in the embodiments of the present application can be implemented in a software manner. Figure 2 The fault parameter determination device 2022 based on the permanent magnet motor stored in the memory 202 is shown, which can be software in the form of a program and a plug-in, etc., including the following software modules: a simulation module 20221, a test module 20222, a collection module 20223 and a determination module 20224. These modules are logical, so they can be arbitrarily combined or further split according to the functions implemented. The functions of each module will be explained below.

[0066] In other embodiments, the fault parameter determination device based on the permanent magnet motor provided in the embodiment of the present application can be implemented in hardware. As an example, the fault parameter determination device based on the permanent magnet motor provided in the embodiment of the present application can be a processor in the form of a hardware decoding processor, which is programmed to execute the fault parameter determination method based on the permanent magnet motor provided in the embodiment of the present application. For example, the processor in the form of a hardware decoding processor can adopt one or more application-specific integrated circuits (ASICs), DSPs, programmable logic devices (PLDs), complex programmable logic devices (CPLDs), field programmable gate arrays (FPGAs) or other electronic components.

[0067] The method for determining fault parameters of a permanent magnet motor provided in an embodiment of the present application will be described in combination with an exemplary application and implementation of a control unit provided in an embodiment of the present application.

[0068] See also Figure 3 , Figure 3 is an optional flow chart of a method for determining fault parameters of a permanent magnet motor provided in an embodiment of the present application, which is combined with Figure 3 The steps shown are explained.

[0069] Step 301, simulating at least one short-circuit fault type of the permanent magnet motor according to the stator structure of the permanent magnet motor to obtain a simulated fault permanent magnet motor;

[0070] Step 302, testing the simulated fault permanent magnet motor through a test platform;

[0071] Step 303, collecting test parameters of the simulated fault permanent magnet motor during the test process;

[0072] Step 304, determining the fault parameters of the permanent magnet motor according to the test parameters; wherein the fault parameters are used to perform fault control on the permanent magnet motor in combination with the working parameters of the permanent magnet motor when the permanent magnet motor is working.

[0073] In actual implementation, according to the permanent magnet motor stator structure, at least one short-circuit fault type is simulated to simulate the permanent magnet motor. Specifically, by modifying the permanent magnet motor, different faults are simulated. In some embodiments, the at least one short-circuit fault includes a turn-to-turn short-circuit fault, a two-phase short-circuit fault, and a three-phase short-circuit fault. Specifically, see Figure 4 , Figure 4 is an optional schematic diagram of a fault simulation provided in an embodiment of the present application. According to the stator structure of the permanent magnet motor, Figure 4 The tapping method shown is used to modify the short-circuit fault. In actual implementation, refer to Figures 5A-5C , Figure 5A is an optional simulation schematic diagram of a turn-to-turn short circuit fault provided in an embodiment of the present application. Figure 5B is an optional simulation schematic diagram of a two-phase short circuit fault provided in an embodiment of the present application. Figure 5C is an optional simulation schematic diagram of a three-phase short circuit fault provided in an embodiment of the present application. Figure 5A Tap shorting is performed at different positions to simulate turn-to-turn short-circuit faults between different turns. Figure 5B Tap short-circuit between different phases to simulate two-phase short-circuit faults in different phases; three-phase short-circuit Figure 5C, tap short-circuit different phases to simulate a three-phase short-circuit fault. Different taps can be realized by welding or reserved wires. If welding is used, the tap part needs to be insulated, and the insulation strength should not be less than the insulation strength of the stator coil body. In one embodiment, see Figure 6 , Figure 6 601 is an optional schematic diagram of a simulated fault motor provided in an embodiment of the present application. Figure 6 The structure shown is used to short-circuit the permanent magnet motor, using a copper nail to short-circuit two turns of the coil or two phase lines. Figure 5A Multiple copper nails are short-circuited at different positions to simulate turn-to-turn short-circuit faults between different numbers of turns; two-phase short circuit is performed according to Figure 5B The model short-circuits multiple copper nails between different phases to simulate two-phase short-circuit faults in different phases; three-phase short-circuit Figure 5C In the model, multiple copper nails are short-circuited between different phases to simulate a three-phase short-circuit fault.

[0074] Next, the simulated fault motor can be tested through the test platform. In some embodiments, the simulated fault motor is connected to the ground wire of the test platform through a grounding cable, and the simulated fault motor is mechanically connected to the traction unit. In some embodiments, the simulated fault motor is tested and the test parameters of the simulated fault motor during the test are collected, including: during the test, controlling the speed of the permanent magnet motor to change from low to high; during the process of the permanent magnet motor speed changing from low to high, collecting the permanent magnet motor speed and state parameters of the simulated fault motor.

[0075] In actual implementation, the simulated fault permanent magnet motor can be cooled by passing coolant or cooling air, and the permanent magnet motor speed corresponding to different preset vehicle speeds can be tested one by one from low to high. Specifically, in actual implementation, the simulated fault motor seat grounding column and the test platform ground wire are connected by a grounding cable, the simulated fault motor is mechanically connected to the traction unit, the simulated fault motor is cooled by passing coolant or cooling air, and the permanent magnet motor speed corresponding to different preset vehicle speeds can be tested one by one from low to high. Among them, the speed from low to high can be, for example, 400r / min, 1000r / min, 2000r / min, 3000r / min, 4000r / min, 5000r / min, 6000r / min.

[0076] In some embodiments, the method further includes: when the state parameter of the simulated fault motor reaches a preset parameter value, stopping the test of the simulated fault motor. In some embodiments, the state parameter includes at least one of the following: current, voltage, bearing vibration parameter, bearing temperature and stator temperature. Specifically, in actual implementation, the back electromotive force waveform, grounding cable, fault point temperature, bearing temperature, stator temperature, bearing vibration, short-circuit current, and infrared imaging temperature changes during the test can be collected.

[0077] In actual implementation, the fault part temperature, bearing vibration, bearing temperature, and stator temperature limits should be set during the test. When the collected data exceeds the limit, the test is stopped. During the test, the test limits should be set. The fault part temperature should not exceed 200℃, the bearing vibration should not exceed 5g, the bearing temperature should not exceed 100℃, and the stator temperature should not exceed 220℃. When the collected data exceeds the limit, the test is stopped.

[0078] In actual implementation, during the test, test parameters of the simulated fault motor during the test are collected. In some embodiments, the simulated fault motor is provided with a sensor for detecting the state parameters. In actual implementation, a temperature detection device is buried in the short-circuit fault modification site, and the traction permanent magnet motor is connected to temperature, vibration, voltage, current, torque, infrared imaging, and video imaging equipment.

[0079] In the embodiment of the present application, after obtaining the test parameters, the fault parameters of the permanent magnet motor are determined according to the test parameters. Here, the fault parameters can be the parameters reached by simulating the faulty motor during the test, which represent the parameters of the permanent magnet motor under the short-circuit fault state. In actual implementation, the fault parameters are used to perform fault control on the permanent magnet motor in combination with the working parameters of the permanent magnet motor when it is working.

[0080] In an embodiment of the present application, at least one short-circuit fault type of a motor is simulated according to the stator structure of the motor to obtain a simulated fault motor; the simulated fault motor is tested through a test platform; test parameters of the simulated fault motor during the test are collected; and the fault parameters of the motor are determined according to the test parameters; wherein the fault parameters are used to perform fault control on the motor in combination with the working parameters of the motor when it is working, and the fault parameters of the short-circuit fault process can be simulated for a single motor, so that accurate fault control can be performed based on accurate fault parameters.

[0081] In some embodiments, the test parameters include multiple groups of sub-parameters, each group of sub-parameters includes a permanent magnet motor speed and state parameters of the permanent magnet motor at the permanent magnet motor speed, and the permanent magnet motor speeds corresponding to each group of sub-parameters are different; determining the fault parameters of the permanent magnet motor according to the test parameters includes: for each group of sub-parameters, determining the fault state parameters of the permanent magnet motor according to the corresponding state parameters; according to the permanent magnet motor speed of each group of sub-parameters, associating each permanent magnet motor speed with the corresponding fault state parameter; determining the associated multiple groups of permanent magnet motor speeds and fault state parameters as the fault parameters.

[0082] In actual implementation, for each permanent magnet motor speed, a group of state parameters are collected, the permanent magnet motor speed is associated with the corresponding state parameters, and the associated permanent magnet motor speed and state parameters are determined as fault parameters.

[0083] In some embodiments, the method also includes: during the operation of the permanent magnet motor, obtaining the operating parameters of the permanent magnet motor, the operating parameters including the operating speed and the operating state parameters; determining the speed range corresponding to the operating speed according to the operating speed and the fault parameters, the upper limit value and the lower limit value of the speed range are both the permanent magnet motor speed included in the fault parameters; determining the upper limit permanent magnet motor speed corresponding to the upper limit value; if the working state parameter reaches the fault state parameter associated with the upper limit permanent magnet motor speed, generating fault indication information for the permanent magnet motor.

[0084] In actual implementation, during the operation of the permanent magnet motor, the operating speed and working state parameters of the permanent magnet motor are obtained. The speed range in which the operating speed is located is determined according to the fault parameters. The endpoint values ​​of the speed range are the permanent magnet motor speeds in the fault parameters. For example, the speed range may be (0, 400r / min], (400r / min, 1000r / min], (1000r / min, 2000r / min], (2000r / min, 3000r / min], (3000r / min, 4000r / min], (4000r / min, 5000r / min] and (5000r / min, 6000r / min]. If the operating speed is 455r / min, the corresponding speed range is (400r / min, 1000r / min].

[0085] Next, the magnitude of the fault state parameter associated with the upper limit value 1000r / min of the speed range is compared. If the working state parameter reaches the value of the fault state parameter associated with the upper limit value, a fault indication message is generated to indicate a permanent magnet motor fault, or to perform corresponding fault control on the permanent magnet motor, such as powering off the permanent magnet motor. In some embodiments, the fault state parameters of the permanent magnet motor at different speeds during operation can be set according to the collected current, voltage, vibration, temperature and other data to guide the safe operation of equipment (such as a vehicle) equipped with a permanent magnet motor.

[0086] The embodiment of the present application simulates at least one short-circuit fault type of the permanent magnet motor according to the stator structure of the permanent magnet motor to obtain a simulated fault permanent magnet motor; tests the simulated fault permanent magnet motor according to preset parameters; collects test parameters of the faulty permanent magnet motor during the test; and determines a parameter threshold of the permanent magnet motor according to the test parameters, so that when the corresponding working parameters of the permanent magnet motor reach the parameter threshold, operation indication information for the permanent magnet motor is generated, the parameter changes in the short-circuit fault process are simulated, and accurate fault judgment is automatically performed.

[0087] The following further describes an exemplary structure of the permanent magnet motor fault parameter determination device 2022 provided in the embodiment of the present application implemented as a software module. In some embodiments, Figure 2 As shown, the software modules stored in the permanent magnet motor fault parameter determination device 2022 in the memory 202 may include:

[0088] A simulation module, used for simulating at least one short-circuit fault type of the permanent magnet motor according to the stator structure of the permanent magnet motor, to obtain a simulated fault permanent magnet motor;

[0089] An experimental module, used for conducting experiments on the simulated fault permanent magnet motor through a test platform;

[0090] A collection module, used for collecting test parameters of the simulated fault motor during the test process;

[0091] A determination module is used to determine the fault parameters of the permanent magnet motor according to the test parameters; wherein the fault parameters are used to perform fault control on the permanent magnet motor in combination with the working parameters of the permanent magnet motor when the permanent magnet motor is working.

[0092] In some embodiments, the test parameters include multiple groups of sub-parameters, each group of sub-parameters includes a permanent magnet motor speed and the state parameters of the permanent magnet motor at the permanent magnet motor speed, and the permanent magnet motor speeds corresponding to each group of sub-parameters are different; the determination module is also used to determine the fault state parameters of the permanent magnet motor according to the corresponding state parameters for each group of sub-parameters; according to the permanent magnet motor speed of each group of sub-parameters, the speeds of each permanent magnet motor are associated with the corresponding fault state parameters; and the associated multiple groups of permanent magnet motor speeds and fault state parameters are determined as the fault parameters.

[0093] In some embodiments, the device also includes: a fault indication module, which is used to obtain the working parameters of the permanent magnet motor during the operation of the permanent magnet motor, and the working parameters include the working speed and the working state parameters; determine the speed range corresponding to the working speed according to the working speed and the fault parameters, and the upper limit value and the lower limit value of the speed range are both the permanent magnet motor speed included in the fault parameters; determine the upper limit permanent magnet motor speed corresponding to the upper limit value; if the working state parameter reaches the fault state parameter associated with the upper limit permanent magnet motor speed, generate fault indication information for the permanent magnet motor.

[0094] In some embodiments, the acquisition module is also used to control the speed of the permanent magnet motor from low to high during the test; and in the process of the permanent magnet motor speed changing from low to high, the permanent magnet motor speed and state parameters of the simulated fault motor are collected.

[0095] In some embodiments, the device further includes: a test stop module, configured to stop the test on the simulated fault motor when the state parameter of the simulated fault motor reaches a preset parameter value.

[0096] In some embodiments, the simulated fault motor is provided with a sensor for detecting the state parameter.

[0097] In some embodiments, the state parameter includes at least one of the following: current, voltage, bearing vibration parameter, bearing temperature, and stator temperature.

[0098] In some embodiments, the simulated fault motor is connected to the ground wire of the test platform through a grounding cable, and the simulated fault motor is mechanically connected to the traction unit.

[0099] In some embodiments, the at least one short circuit fault includes a turn-to-turn short circuit fault, a two-phase short circuit fault, and a three-phase short circuit fault.

[0100] It should be noted that the description of the device of the embodiment of the present application is similar to the description of the above-mentioned method embodiment, and has similar beneficial effects as the method embodiment, so it will not be repeated.

[0101] The embodiment of the present application provides a computer program product, which includes computer instructions, which are stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the method for determining fault parameters of a permanent magnet motor described in the embodiment of the present application.

[0102] An embodiment of the present application provides a computer-readable storage medium storing executable instructions, wherein executable instructions are stored. When the executable instructions are executed by a processor, the processor will execute the method for determining fault parameters of a permanent magnet motor provided in the embodiment of the present application.

[0103] In some embodiments, the computer-readable storage medium may be a memory such as FRAM, ROM, PROM, EPROM, EEPROM, flash memory, magnetic surface storage, optical disk, or CD-ROM; or it may be various devices including one or any combination of the above memories.

[0104] In some embodiments, executable instructions may be in the form of a program, software, software module, script or code, written in any form of programming language (including compiled or interpreted languages, or declarative or procedural languages), and may be deployed in any form, including as a stand-alone program or as a module, component, subroutine or other unit suitable for use in a computing environment.

[0105] As an example, executable instructions may, but need not, correspond to a file in a file system, may be stored as part of a file that stores other programs or data, such as in one or more scripts in a HyperText Markup Language (HTML) document, in a single file dedicated to the program in question, or in multiple coordinated files (e.g., files storing one or more modules, subroutines, or code portions).

[0106] By way of example, executable instructions may be deployed to be executed on one computing device, or on multiple computing devices located at one site, or on multiple computing devices distributed across multiple sites and interconnected by a communication network.

[0107] In summary, the embodiments of the present application can simulate the fault parameters of a short-circuit fault process for a single motor, so that accurate fault control can be performed based on accurate fault parameters.

[0108] The above is only an embodiment of the present application and is not intended to limit the protection scope of the present application. Any modifications, equivalent substitutions and improvements made within the spirit and scope of the present application are included in the protection scope of the present application.

Claims

1. A method for determining fault parameters of a permanent magnet motor, characterized in that: include: According to the stator structure of the permanent magnet motor, at least one short circuit fault type of the permanent magnet motor is simulated to obtain a simulated fault permanent magnet motor; Conducting a test on the simulated fault permanent magnet motor through a test platform; Collecting test parameters of the simulated fault permanent magnet motor during the test process; Determining fault parameters of the permanent magnet motor according to the test parameters; The fault parameters are used to perform fault control on the permanent magnet motor in combination with the working parameters of the permanent magnet motor.

2. The method according to claim 1, characterized in that The test parameters include multiple groups of sub-parameters, each group of sub-parameters includes a permanent magnet motor speed and a state parameter of the permanent magnet motor at the permanent magnet motor speed, and each group of sub-parameters corresponds to a different permanent magnet motor speed; determining the fault parameters of the permanent magnet motor according to the test parameters includes: For each group of sub-parameters, determining the fault state parameter of the permanent magnet motor according to the corresponding state parameter; According to the permanent magnet motor speed of each group of sub-parameters, the speed of each permanent magnet motor is associated with the corresponding fault state parameter; A plurality of associated groups of permanent magnet motor rotation speeds and fault state parameters are determined as the fault parameters.

3. The method according to claim 2, characterized in that The method further comprises: During the operation of the permanent magnet motor, the operating parameters of the permanent magnet motor are obtained, wherein the operating parameters include operating speed and operating state parameters; According to the working speed and the fault parameter, a speed range corresponding to the working speed is determined, wherein the upper limit value and the lower limit value of the speed range are both the permanent magnet motor speed included in the fault parameter; Determine an upper limit permanent magnet motor speed corresponding to the upper limit value; If the working state parameter reaches a fault state parameter associated with the upper limit permanent magnet motor speed, fault indication information for the permanent magnet motor is generated.

4. The method according to claim 2, characterized in that: The step of testing the simulated fault motor and collecting test parameters of the simulated fault motor during the test includes: During the test, the speed of the permanent magnet motor is controlled to change from low to high; When the speed of the permanent magnet motor changes from low to high, the speed and state parameters of the permanent magnet motor of the simulated fault motor are collected.

5. The method according to claim 4, characterized in that The method further comprises: When the state parameter of the simulated fault motor reaches a preset parameter value, the test on the simulated fault permanent magnet motor is stopped.

6. The method according to claim 2, characterized in that The simulated fault permanent magnet motor is provided with a sensor for detecting the state parameter.

7. The method according to claim 2, characterized in that The state parameter includes at least one of the following: current, voltage, bearing vibration parameter, bearing temperature and stator temperature.

8. The method according to claim 1, characterized in that The simulated fault motor is connected to the ground wire of the test platform through a grounding cable, and the simulated fault motor is mechanically connected to the traction unit.

9. The method according to claim 1, characterized in that: The at least one short circuit fault includes a turn-to-turn short circuit fault, a two-phase short circuit fault and a three-phase short circuit fault.

10. A device for determining fault parameters of a permanent magnet motor, characterized in that: include: A simulation module, used for simulating at least one short-circuit fault type of the permanent magnet motor according to the stator structure of the permanent magnet motor, to obtain a simulated fault permanent magnet motor; A test module, used for testing the simulated fault permanent magnet motor through a test platform; An acquisition module, used for acquiring parameters of the simulated fault permanent magnet motor during the test process; A determination module, used to determine the fault parameters of the permanent magnet motor according to the test parameters; The fault parameters are used to perform fault control on the permanent magnet motor in combination with the working parameters of the permanent magnet motor.

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