CN113311335A - Method, device and equipment for determining residual running time of motor and storage medium - Google Patents
Method, device and equipment for determining residual running time of motor and storage medium Download PDFInfo
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- CN113311335A CN113311335A CN202110866107.4A CN202110866107A CN113311335A CN 113311335 A CN113311335 A CN 113311335A CN 202110866107 A CN202110866107 A CN 202110866107A CN 113311335 A CN113311335 A CN 113311335A
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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
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/11—Complex mathematical operations for solving equations, e.g. nonlinear equations, general mathematical optimization problems
Abstract
The application provides a method, a device, equipment and a storage medium for determining the residual running time of a motor, and particularly relates to the technical field of artificial intelligence. The specific implementation scheme is as follows: acquiring capacitance values of all phases of a stator winding in the motor, the number of stator bars contained in the stator winding and the capacitance value of each stator bar; determining a current reference capacitance value of the stator bar according to the capacitance value of each phase, the number of the stator bars and/or the capacitance value of each stator bar; determining a current residual breakdown voltage corresponding to the current reference capacitance value based on a preset rule; and determining the residual operation time of the motor according to the current residual breakdown voltage and the safety voltage threshold corresponding to the motor. Therefore, the stator insulation residual operation time can be accurately and effectively evaluated by establishing the corresponding relation between the parameters and the residual operation time.
Description
Technical Field
The application relates to the technical field of artificial intelligence, in particular to a method, a device, equipment and a storage medium for determining the residual running time of a motor.
Background
The generator stator insulation is a key component related to the normal operation of the generator, and once a fault occurs, the overhaul period is long and the economic loss is large. In the related technology, the prediction of the insulation life mainly depends on test data of partial discharge, insulation resistance and the like of the generator stator insulation, a life prediction mathematical model is established by using parameters which are mainly based on the partial discharge capacity and assisted by the insulation resistance and the like, and in actual application, because the test of the partial discharge capacity is greatly interfered by the field environment, the measured value is easy to distort, and the residual life of the insulation is difficult to predict. Therefore, how to accurately predict the residual life of the insulation is very important for power generation enterprises.
Disclosure of Invention
The application provides a method, a device, equipment and a storage medium for determining the residual running time of a motor.
According to a first aspect of the present application, there is provided a method for determining a remaining operation time of a motor, comprising:
acquiring capacitance values of all phases of a stator winding in the motor, the number of stator bars contained in the stator winding and the capacitance value of each stator bar;
determining a current reference capacitance value of the stator bar according to the capacitance value of each phase, the number of the stator bars and/or the capacitance value of each stator bar;
determining a current residual breakdown voltage corresponding to the current reference capacitance value based on a preset rule;
and determining the residual operation time of the motor according to the current residual breakdown voltage and the safety voltage threshold corresponding to the motor.
According to a second aspect of the present application, there is provided a device for determining a remaining operation time of an electric motor,
the method comprises the following steps:
the first acquisition module is used for acquiring capacitance values of all phases of a stator winding in the motor, the number of stator bars contained in the stator winding and the capacitance value of each stator bar;
a first determination module for determining a current reference capacitance value for each stator bar based on the phase capacitance value, the number of stator bars, and/or the capacitance value of each stator bar;
a second determining module, configured to determine, based on a preset rule, a current remaining breakdown voltage corresponding to the current reference capacitance value;
and the third determining module is used for determining the residual running time of the motor according to the current residual breakdown voltage and the safety voltage threshold corresponding to the motor.
An embodiment of a third aspect of the present application provides a computer device, including: the present invention relates to a computer program product, and a computer program product stored on a memory and executable on a processor, which when executed by the processor performs a method as set forth in an embodiment of the first aspect of the present application.
An embodiment of a fourth aspect of the present application provides a non-transitory computer-readable storage medium storing a computer program, which when executed by a processor implements the method as set forth in the embodiment of the first aspect of the present application.
The method, the device, the equipment and the storage medium for determining the residual running time of the motor can firstly acquire capacitance values of each phase of a stator winding in the motor, the number of stator bars contained in the stator winding and the capacitance value of each stator bar, then determine a current reference capacitance value of each stator bar according to the capacitance values of each phase, the number of the stator bars and/or the capacitance value of each stator bar, then determine a current residual breakdown voltage corresponding to the current reference capacitance value based on a preset rule, and then determine the residual running time of the motor according to the current residual breakdown voltage and a safety voltage threshold corresponding to the motor. Therefore, the breakdown voltage value of the electronic bar is determined according to the capacitance obtained by testing the motor, the insulation cannot cause accumulative trauma, the field interference is not easy to cause, the insulation state of the generator can be accurately evaluated, and the insulation residual operation time of the stator can be accurately and effectively evaluated by establishing the corresponding relation between the parameters and the residual operation time.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present application, nor do they limit the scope of the present application. Other features of the present application will become apparent from the following description.
Drawings
The drawings are included to provide a better understanding of the present solution and are not intended to limit the present application. Wherein:
fig. 1 is a schematic flowchart of a method for determining a remaining operating time of a motor according to an embodiment of the present application;
fig. 2 is a schematic flowchart of a method for determining a remaining operating time of a motor according to another embodiment of the present application;
fig. 3 is a scatter plot mapping diagram of a method for determining the remaining operating time of the motor according to an embodiment of the present application;
fig. 4 is a schematic diagram of a correlation model of breakdown voltage and operation age for a method for determining a remaining operation time of a motor according to an embodiment of the present application;
fig. 5 is a block diagram illustrating a remaining operation time determining apparatus for a motor according to an embodiment of the present disclosure;
fig. 6 is a block diagram of an electronic device for implementing the method for determining the remaining operating time of the motor according to the embodiment of the present application.
Detailed Description
The following description of the exemplary embodiments of the present application, taken in conjunction with the accompanying drawings, includes various details of the embodiments of the application for the understanding of the same, which are to be considered exemplary only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present application. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
The method for determining the remaining operating time of the motor provided by the present application may be executed by the apparatus for determining the remaining operating time of the motor provided by the present application, and may also be executed by an electronic device provided by the present application, where the electronic device may include, but is not limited to, a terminal device such as a desktop computer, a tablet computer, and the like, and may also be a server, and the method for determining the remaining operating time of the motor provided by the present application is executed by the apparatus for determining the remaining operating time of the motor provided by the present application, and is not limited to the present application, and is hereinafter simply referred to as "apparatus".
The following describes a method, an apparatus, a computer device, and a storage medium for determining a remaining operating time of a motor provided in the present application in detail with reference to the accompanying drawings.
Fig. 1 is a flowchart illustrating a method for determining a remaining operation time of a motor according to an embodiment of the present application.
As shown in fig. 1, the method for determining the remaining operation time of the motor may include the following steps:
And 102, determining a current reference capacitance value of the stator bar according to the capacitance value of each phase, the number of the stator bars and/or the capacitance value of each stator bar.
Wherein the reference capacitance value may be used to represent the capacitance value of each stator bar.
Specifically, as the insulation of the stator winding in the motor increases along with the increase of the operation time, the air gap content is increased day by day, the insulation is aged gradually, and the current corresponding capacitance value of the stator bar is increased correspondingly. Thus, the embodiment of the application can regularly test the capacitance of each phase of the stator winding and the capacitance of each stator bar in the capacitance of each phase.
Optionally, the capacitance value may be obtained in various ways, for example, each phase capacitance value of the stator winding in the motor and the number of stator bars included in the stator winding may be obtained first, and then the average capacitance value of the stator bars is determined according to the minimum capacitance value in each phase capacitance value and the number of stator bars, so that the average capacitance value of the stator bars may be the current reference capacitance value of the stator bars. Or the stator bar can be directly measured through a capacitance baffle of the multimeter to obtain the capacitance value.
It will be appreciated that the capacitance values of the phases of the stator winding can be obtained by direct measurement of the capacitance bars of a multimeter. After the capacitance values of all phases of the stator winding in the motor are obtained, the minimum capacitance value can be determined, and according to the number of the stator bars and the minimum capacitance value, the average capacitance value of the stator bars can be calculated, namely the capacitance value corresponding to a single stator bar.
In addition, the capacitance values of the stator bars in the stator winding of the motor can be acquired respectively, and then the minimum capacitance value in the capacitance values of the stator bars is determined as the current reference capacitance value of the stator bars.
For example, if there are 3 stator bars, a, B, C, respectively. A, B, C have capacitance values of 1pf, 1.5pf and 2pf respectively, so that the current capacitance value of the stator bar a can be used as the current reference capacitance value of the stator bar.
And 102, determining the current residual breakdown voltage corresponding to the current reference capacitance value based on a preset rule.
It should be noted that the preset rule may be determined according to a large amount of previous data, for example, the capacitances of a large number of stator bars and corresponding breakdown voltage parameters may be tested first, and thus, a mapping rule of corresponding reference capacitance values to breakdown voltages may be obtained. The method can be a breakdown voltage and reference capacitance value mapping relation table, a scatter diagram or a fitting curve.
Furthermore, according to a preset rule, the device can determine the current residual breakdown voltage corresponding to the current reference capacitance value.
The residual breakdown voltage may be a characteristic for measuring the quality of the insulation performance of the electrical equipment, and in general, the end of the insulation life of the large motor may be the magnitude of the voltage value of the residual breakdown voltage as a judgment standard.
Optionally, when determining the current remaining breakdown voltage corresponding to the current reference capacitance value, there may be a plurality of ways, for example, the current remaining breakdown voltage corresponding to the current reference capacitance value may be determined based on a preset mapping table of capacitance values and remaining breakdown voltages.
It should be noted that the mapping table may be used to represent a relationship between the preset capacitance value and the residual breakdown voltage, and may be a one-to-one relationship, such as a unary linear regression function.
For example, the following formula may be selected:
the variable x is used as capacitance, and the variable y is used as residual breakdown voltage.
It will be appreciated that the relationship between the above equations can be divided into two parts, one part being the change in y due to the change in x, noted as
Another part can be thought of as a change caused by any random factor, and is noted as
。
Wherein the content of the first and second substances,
is a constant value of the regression equation,
in order to be the regression coefficient, the method,
to influence the parameters.
Fig. 3 shows a scatter plot, as shown in fig. 3, which can determine the current residual breakdown voltage according to the current reference capacitance value.
It should be noted that the breakdown voltage, i.e. the residual breakdown voltage, in fig. 3, fig. 3 is a schematic illustration of an embodiment of the present application, and is not intended to limit the present application.
And 103, determining the residual running time of the motor according to the current residual breakdown voltage and the safety voltage threshold corresponding to the motor.
It should be noted that, according to the relationship between the current residual breakdown voltage and the running time of the motor and the safe voltage threshold of the motor, the residual running time of the motor can be determined. Wherein the safe voltage threshold may be a safe threshold of the residual breakdown voltage.
It should be noted that, in the embodiment of the present application, a preset rule, such as a corresponding relation, for example, a functional relation, between the residual breakdown voltage and the operation time of the motor, may be first established. Alternatively, the neural network model may also be trained in advance.
For example, as shown in FIG. 4, FIG. 4 shows a correlation model of breakdown voltage and age of operation. Wherein the safe voltage threshold is 22kv, and the linear model of the breakdown voltage and the remaining operation time is y = -0.1415x +79.966+ 0.991. For example, if the current breakdown voltage is 70kv, the corresponding operating age is 77 months. And the safe voltage threshold corresponds to an operating age of 410 months, so that the remaining operating time is also 410-77=333 months.
As shown in fig. 4, the horizontal straight line where y =22 is also the safety voltage threshold, that is, the lowest ac withstand voltage value of the lowest residual breakdown voltage, and the oblique line where y = -0.1415x +79.966+0.991 is also the trend graph of the change of the residual breakdown voltage with the operating time, so that the intersection point of the two straight lines is also the end point of the life of the motor.
According to the embodiment of the application, each phase capacitance value of a stator winding in an electric machine, the number of stator bars contained in the stator winding and the capacitance value of each stator bar are firstly obtained, then the current reference capacitance value of each stator bar is determined according to each phase capacitance value, the number of the stator bars and/or the capacitance value of each stator bar, then the current residual breakdown voltage corresponding to the current reference capacitance value is determined based on a preset rule, and then the residual operation time of the electric machine is determined according to the current residual breakdown voltage and the safety voltage threshold value corresponding to the electric machine. Therefore, the breakdown voltage value of the electronic bar is determined according to the capacitance obtained by testing the motor, the insulation cannot cause accumulative trauma, the field interference is not easy to cause, the insulation state of the generator can be accurately evaluated, and the insulation residual operation time of the stator can be accurately and effectively evaluated by establishing the corresponding relation between the parameters and the residual operation time.
Fig. 2 is a flowchart illustrating a method for determining a remaining operation time of a motor according to another embodiment of the present application.
As shown in fig. 2, the method for determining the remaining operation time of the motor may include the following steps:
It should be noted that, the specific implementation process of step 201 may refer to the foregoing embodiments, and is not described herein again.
At 202, a material of an insulating medium in the stator bar is determined.
It should be noted that the material of the insulating medium may be many, such as solid rubber, plastic, glass, ceramic, etc., and may also be air, carbon dioxide, etc., which is a gas, and is not limited herein.
It should be noted that the insulating medium may be broken down under certain external conditions, such as high temperature and high voltage. The corresponding residual breakdown voltages of insulating media of different materials are different. Therefore, different materials of the insulating material can be calculated according to different models.
The model may be a mathematical model, such as a unary linear function model, or may also be a neural network model, which is not limited herein.
In addition, in other possible implementation manners, the corresponding preset rule may also be determined according to the material of the insulating material.
It should be noted that the model may be a model generated by pre-training, and the model is a correlation model between the capacitance value of the single stator bar and the residual breakdown voltage. Therefore, after the currently obtained capacitance value is input into the model generated by training, the residual breakdown voltage corresponding to the current reference capacitance value can be predicted.
The historical operating data may be electrical data of the motor over the years, such as capacitance values, breakdown voltage values, historical operating time lengths, and the like of each period, which is not limited herein.
It should be noted that a database of each motor may be established in advance, wherein the database may contain electrical data of each dimension of each type of motor in each operation period.
Therefore, the historical operation data can be extracted by the database, so that data support is provided for representing the operation and aging rules of the motor later, and a model and rules can be constructed more accurately.
And step 206, determining a mapping relation between the breakdown voltage and the operation time length corresponding to the motor according to the historical operation data.
It should be noted that after the historical operation data of each period is collected, the mapping relationship between the corresponding breakdown voltage and the operation time length can be determined according to the measurement result of the capacitance of the motor of each unit of the same type.
Optionally, after determining the mapping relationship between the breakdown voltage and the operation time length corresponding to the motor, the device may obtain historical operation data of N reference motors, where the material of the insulating medium in the stator bars of the reference motors is the same as the material of the insulating medium in the stator bars of the motor. Wherein N is a positive integer.
The N reference motors can be motors of the same type as the current motor, for example, the insulation medium materials of the stator bars are the same, the voltage levels are the same, and the cooling mode is the same, so that the mapping relation between breakdown voltage and operation time can be accurately and effectively fitted. The mapping relation can better represent the rule of insulation aging, and support is provided for determining the residual running time of the motor later.
Further, the mapping relation is corrected according to historical operation data of the N reference motors.
It should be noted that, as time increases, the motor ages and the residual breakdown voltage decreases, the historical operation data also needs to be adjusted, so the device can correct the mapping relationship according to the historical operation data of the N reference motors to obtain a more accurate mapping relationship.
And step 207, determining the residual running time of the motor based on the mapping relation, the current residual breakdown voltage and the safety voltage threshold corresponding to the motor.
It should be noted that, the specific implementation process of step 207 may refer to step 103 described above, and is not described herein again.
In the embodiment of the application, a current reference capacitance value of a stator bar in a motor is determined, then a material of an insulating medium in the stator bar is determined, a model is obtained according to the material of the insulating medium, the current reference capacitance value is input into the model generated by training to determine a current residual breakdown voltage corresponding to the current reference capacitance value, then historical operation data of the motor are obtained, wherein each historical operation data comprises historical operation time of the motor and a corresponding breakdown voltage, a mapping relation between the breakdown voltage corresponding to the motor and the operation time is determined according to each historical operation data, and finally the residual operation time of the motor is determined based on the mapping relation, the current residual breakdown voltage and a safety voltage threshold corresponding to the motor. Therefore, accumulated historical operation data in the actual operation process of the unit are adopted to predict the later residual operation time, a mathematical model between the residual breakdown voltage and the operation time is established, and then the model is verified and corrected in a mode of randomly drawing a wire rod to perform a breakdown test, so that the residual operation time of the motor equipment can be accurately diagnosed.
In order to implement the above embodiment, the present application further provides a device for determining the remaining operating time of the motor.
Fig. 5 is a schematic structural diagram of an apparatus for determining a remaining operating time of a motor according to an embodiment of the present application.
As shown in fig. 5, the apparatus 500 for determining the remaining operation time of the motor includes:
a first obtaining module 510, configured to obtain capacitance values of phases of a stator winding in the electric machine, a number of stator bars included in the stator winding, and a capacitance value of each stator bar;
a first determination module 520 for determining a current reference capacitance value for each stator bar based on the phase capacitance value, the number of stator bars, and/or the capacitance value of each stator bar;
a second determining module 530, configured to determine, based on a preset rule, a current remaining breakdown voltage corresponding to the current reference capacitance value;
a third determining module 540, configured to determine a remaining operating time of the motor according to the current remaining breakdown voltage and a safety voltage threshold corresponding to the motor.
Optionally, the second determining module is specifically configured to:
determining the current residual breakdown voltage corresponding to the current reference capacitance value based on a preset mapping relation table of the capacitance value and the residual breakdown voltage;
alternatively, the first and second electrodes may be,
and inputting the current reference capacitance value into a model generated by training so as to determine the current residual breakdown voltage corresponding to the current reference capacitance value.
Optionally, the second determining module is further configured to:
determining a material of an insulating medium in the stator bar;
and acquiring the mapping relation table or the model according to the material of the insulating medium.
Optionally, the first determining module is specifically configured to:
determining an average capacitance value of the stator bars according to a minimum capacitance value of the capacitance values of the phases and the number of the stator bars.
Optionally, the first determining module is specifically configured to:
determining a minimum of the capacitance values of the respective stator bars as a current reference capacitance value for the stator bar;
determining an average capacitance value of the stator bars as a current reference capacitance value of the stator bars.
Optionally, the third determining module includes:
the motor control device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring various historical operating data of the motor, and each historical operating data comprises the historical operating duration and the corresponding breakdown voltage of the motor;
the first determining unit is used for determining the mapping relation between the breakdown voltage and the operation duration corresponding to the motor according to the historical operation data;
and the second determination unit is used for determining the residual running time of the motor based on the mapping relation, the current residual breakdown voltage and the safety voltage threshold corresponding to the motor.
Optionally, the first determining unit is further configured to:
obtaining historical operating data of N reference motors, wherein the material of an insulating medium in a stator bar of the reference motor is the same as the material of the insulating medium in the stator bar of the motor;
and correcting the mapping relation according to the historical operating data of the N reference motors.
The method comprises the steps of firstly, acquiring capacitance values of all phases of stator windings in the motor, the number of stator bars included in the stator windings and the capacitance value of each stator bar; determining a current reference capacitance value of the stator bars according to the capacitance values of the phases, the number of the stator bars and/or the capacitance value of each stator bar, and then determining a current residual breakdown voltage corresponding to the current reference capacitance value based on a preset rule and then determining a residual operation time of the motor according to a safety voltage threshold value corresponding to the current residual breakdown voltage and the motor. Therefore, the breakdown voltage value of the electronic bar is determined according to the capacitance obtained by testing the motor, the insulation cannot cause accumulative trauma, the field interference is not easy to cause, the insulation state of the generator can be accurately evaluated, and the insulation residual operation time of the stator can be accurately and effectively evaluated by establishing the corresponding relation between the parameters and the residual operation time.
There is also provided, in accordance with an embodiment of the present application, an electronic device, a readable storage medium, and a computer program product.
FIG. 6 illustrates a schematic block diagram of an example electronic device 500 that can be used to implement embodiments of the present application. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be examples only, and are not meant to limit implementations of the present application that are described and/or claimed herein.
As shown in fig. 6, the apparatus 500 includes a computing unit 501 that can perform various appropriate actions and processes according to a computer program stored in a Read Only Memory (ROM) 502 or a computer program loaded from a storage unit 508 into a Random Access Memory (RAM) 503. In the RAM 503, various programs and data required for the operation of the device 500 can also be stored. The calculation unit 501, the ROM 502, and the RAM 503 are connected to each other by a bus 504. An input/output (I/O) interface 505 is also connected to bus 504.
A number of components in the device 500 are connected to the I/O interface 505, including: an input unit 506 such as a keyboard, a mouse, or the like; an output unit 507 such as various types of displays, speakers, and the like; a storage unit 508, such as a magnetic disk, optical disk, or the like; and a communication unit 509 such as a network card, modem, wireless communication transceiver, etc. The communication unit 509 allows the device 500 to exchange information/data with other devices through a computer network such as the internet and/or various telecommunication networks.
The computing unit 501 may be a variety of general-purpose and/or special-purpose processing components having processing and computing capabilities. Some examples of the computing unit 501 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various dedicated Artificial Intelligence (AI) computing chips, various computing units running machine learning model algorithms, a Digital Signal Processor (DSP), and any suitable processor, controller, microcontroller, and so forth. The calculation unit 501 executes the respective methods and processes described above, such as the determination method of the remaining operating time of the motor. For example, in some embodiments, the method of determining the remaining run time of the motor may be implemented as a computer software program tangibly embodied in a machine-readable medium, such as storage unit 508. In some embodiments, part or all of the computer program may be loaded and/or installed onto the device 500 via the ROM 502 and/or the communication unit 509. When the computer program is loaded into the RAM 503 and executed by the computing unit 501, one or more steps of the method for determining the remaining run time of the motor described above may be performed. Alternatively, in other embodiments, the calculation unit 501 may be configured by any other suitable means (e.g. by means of firmware) to perform the method of determining the remaining run time of the motor.
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuitry, Field Programmable Gate Arrays (FPGAs), Application Specific Integrated Circuits (ASICs), Application Specific Standard Products (ASSPs), system on a chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs that are executable and/or interpretable on a programmable system including at least one programmable processor, which may be special or general purpose, receiving data and instructions from, and transmitting data and instructions to, a storage system, at least one input device, and at least one output device.
Program code for implementing the methods of the present application may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowchart and/or block diagram to be performed. The program code may execute entirely on the machine, partly on the machine, as a stand-alone software package partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of this application, a machine-readable medium may be a tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on a computer having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) by which a user can provide input to the computer. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic, speech, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a back-end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back-end, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), Wide Area Networks (WANs), the internet, and blockchain networks.
The computer system may include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The Server can be a cloud Server, also called a cloud computing Server or a cloud host, and is a host product in a cloud computing service system, so as to solve the defects of high management difficulty and weak service expansibility in the traditional physical host and VPS service ("Virtual Private Server", or simply "VPS"). The server may also be a server of a distributed system, or a server incorporating a blockchain.
The method comprises the steps of firstly, acquiring capacitance values of all phases of stator windings in the motor, the number of stator bars included in the stator windings and the capacitance value of each stator bar; determining a current reference capacitance value of the stator bars according to the capacitance values of the phases, the number of the stator bars and/or the capacitance value of each stator bar, and then determining a current residual breakdown voltage corresponding to the current reference capacitance value based on a preset rule and then determining a residual operation time of the motor according to a safety voltage threshold value corresponding to the current residual breakdown voltage and the motor. Therefore, the breakdown voltage value of the electronic bar is determined according to the capacitance obtained by testing the motor, the insulation cannot cause accumulative trauma, the field interference is not easy to cause, the insulation state of the generator can be accurately evaluated, and the insulation residual operation time of the stator can be accurately and effectively evaluated by establishing the corresponding relation between the parameters and the residual operation time.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present disclosure may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solutions disclosed in the present disclosure can be achieved.
The above-described embodiments should not be construed as limiting the scope of the present application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (16)
1. A method for determining a remaining run time of an electric motor, comprising:
acquiring capacitance values of all phases of a stator winding in the motor, the number of stator bars contained in the stator winding and the capacitance value of each stator bar;
determining a current reference capacitance value of the stator bar according to the capacitance value of each phase, the number of the stator bars and/or the capacitance value of each stator bar;
determining a current residual breakdown voltage corresponding to the current reference capacitance value based on a preset rule;
and determining the residual operation time of the motor according to the current residual breakdown voltage and the safety voltage threshold corresponding to the motor.
2. The method of claim 1, wherein the determining a current residual breakdown voltage corresponding to the current reference capacitance value based on a preset rule comprises:
determining the current residual breakdown voltage corresponding to the current reference capacitance value based on a preset mapping relation table of the capacitance value and the residual breakdown voltage;
alternatively, the first and second electrodes may be,
and inputting the current reference capacitance value into a model generated by training so as to determine the current residual breakdown voltage corresponding to the current reference capacitance value.
3. The method of claim 2, wherein prior to the determining a current remaining breakdown voltage corresponding to the current reference capacitance value based on a preset rule, further comprising:
determining a material of an insulating medium in the stator bar;
and acquiring the mapping relation table or the model according to the material of the insulating medium.
4. The method of claim 1, wherein said determining a current reference capacitance value for each stator bar based on said phase capacitance value, said number of stator bars, and/or a capacitance value of said stator bar comprises:
determining a minimum capacitance value of the capacitance values of the phases;
determining an average capacitance value of the stator bars according to a minimum capacitance value in the capacitance values of each phase and the number of the stator bars;
determining an average capacitance value of the stator bars as a current reference capacitance value of the stator bars.
5. The method of claim 1, wherein said determining a current reference capacitance value for each stator bar based on said phase capacitance value, said number of stator bars, and/or a capacitance value of said stator bar comprises:
determining a minimum of the capacitance values of the respective stator bars as a current reference capacitance value for the stator bar.
6. The method of any of claims 1-5, wherein determining the remaining run time of the motor based on the current remaining breakdown voltage and a safe voltage threshold corresponding to the motor comprises:
obtaining various historical operating data of the motor, wherein each historical operating data comprises the historical operating duration and the corresponding breakdown voltage of the motor;
determining a mapping relation between breakdown voltage and operation duration corresponding to the motor according to each historical operation data;
and determining the residual running time of the motor based on the mapping relation, the current residual breakdown voltage and a safety voltage threshold corresponding to the motor.
7. The method of claim 6, wherein after determining the mapping of the breakdown voltage to the operating time duration for the electric machine, further comprising:
obtaining historical operating data of N reference motors, wherein the material of an insulating medium in a stator bar of the reference motor is the same as the material of the insulating medium in the stator bar of the motor;
and correcting the mapping relation according to the historical operating data of the N reference motors.
8. A device for determining a remaining operating time of a motor, comprising:
the first acquisition module is used for acquiring capacitance values of all phases of a stator winding in the motor, the number of stator bars contained in the stator winding and the capacitance value of each stator bar;
a first determination module for determining a current reference capacitance value for each stator bar based on the phase capacitance value, the number of stator bars, and/or the capacitance value of each stator bar;
a second determining module, configured to determine, based on a preset rule, a current remaining breakdown voltage corresponding to the current reference capacitance value;
and the third determining module is used for determining the residual running time of the motor according to the current residual breakdown voltage and the safety voltage threshold corresponding to the motor.
9. The apparatus of claim 8, wherein the second determining module is specifically configured to:
determining the current residual breakdown voltage corresponding to the current reference capacitance value based on a preset mapping relation table of the capacitance value and the residual breakdown voltage;
alternatively, the first and second electrodes may be,
and inputting the current reference capacitance value into a model generated by training so as to determine the current residual breakdown voltage corresponding to the current reference capacitance value.
10. The apparatus of claim 9, wherein the second determining module is further configured to:
determining a material of an insulating medium in the stator bar;
and acquiring the mapping relation table or the model according to the material of the insulating medium.
11. The apparatus of claim 8, wherein the first determining module is specifically configured to:
determining a minimum capacitance value of the capacitance values of the phases;
determining an average capacitance value of the stator bars according to a minimum capacitance value in the capacitance values of each phase and the number of the stator bars;
determining an average capacitance value of the stator bars as a current reference capacitance value of the stator bars.
12. The apparatus of claim 8, wherein the first determining module is specifically configured to:
determining a minimum of the capacitance values of the respective stator bars as a current reference capacitance value for the stator bar.
13. The apparatus of any of claims 8-12, wherein the third determining module comprises:
the motor control device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring various historical operating data of the motor, and each historical operating data comprises the historical operating duration and the corresponding breakdown voltage of the motor;
the first determining unit is used for determining the mapping relation between the breakdown voltage and the operation duration corresponding to the motor according to the historical operation data;
and the second determination unit is used for determining the residual running time of the motor based on the mapping relation, the current residual breakdown voltage and the safety voltage threshold corresponding to the motor.
14. The apparatus of claim 13, wherein the first determining unit is further configured to:
obtaining historical operating data of N reference motors, wherein the material of an insulating medium in a stator bar of the reference motor is the same as the material of the insulating medium in the stator bar of the motor;
and correcting the mapping relation according to the historical operating data of the N reference motors.
15. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method according to any one of claims 1-7 when executing the program.
16. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1 to 7.
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