CN108266364B - Electric pump load over-low fault diagnosis method and device - Google Patents
Electric pump load over-low fault diagnosis method and device Download PDFInfo
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- CN108266364B CN108266364B CN201711499533.9A CN201711499533A CN108266364B CN 108266364 B CN108266364 B CN 108266364B CN 201711499533 A CN201711499533 A CN 201711499533A CN 108266364 B CN108266364 B CN 108266364B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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Abstract
The invention provides a method and a device for diagnosing a fault of an electric pump load, relates to the technical field of detection, and aims to relieve the defect of lack of a method for diagnosing the fault of the electric pump load in the prior art and realize the diagnosis of the fault of the electric pump load. The electric pump load underlow fault diagnosis method comprises the following steps: firstly, acquiring the current rotating speed and the current of the electric pump, then comparing the current rotating speed with the calibrated rotating speed, and then searching the minimum current in a corresponding table when the current rotating speed is greater than the calibrated rotating speed, wherein the corresponding table comprises the corresponding relation between the actual rotating speed value and the current value under different oil temperature conditions; and then, judging whether the current is less than the minimum current, recording the judged time as a timing zero point, and judging that the load of the electric pump is too low when the judgment result is yes and the difference value between the timing time and the timing zero point reaches 2000 ms.
Description
Technical Field
The invention relates to the technical field of detection, in particular to a method and a device for diagnosing a fault of electric pump load excessively low.
Background
The pump is a machine for conveying fluid or pressurizing fluid, and during the use process, the pump can transmit mechanical energy or other external energy to the liquid, so that the energy of the liquid is increased, and then the purpose of conveying the liquid to a high place is achieved. Generally, a pump is classified into an electric pump, a water turbine pump, and the like according to a driving method, and the electric pump is an electrically driven pump, and converts electric energy into original energy for increasing liquid supply energy when in use.
In use, different sizes of electric pumps are usually connected with loads (such as impellers) of different sizes, and the electric pumps realize energy conversion through the action of the different loads so as to pump corresponding liquids and the like. However, the electric pump is often under-loaded during use, which results in inefficient energy conversion.
In summary, no effective solution exists for the problem that the load of the electric pump is too low in the using process.
Disclosure of Invention
In view of this, an object of the embodiments of the present invention is to provide a method and an apparatus for diagnosing a fault of an electric pump with too low load, so as to alleviate the lack of a method for diagnosing a fault of an electric pump with too low load in the prior art, and enable to diagnose the electric pump with too low load.
In a first aspect, an embodiment of the present invention provides a method for diagnosing an electric pump underload fault, including:
acquiring the current rotating speed and current of the electric pump;
comparing the current rotating speed with the calibrated rotating speed;
when the current rotating speed is greater than the calibrated rotating speed, searching the minimum current in the corresponding table; the corresponding table comprises the corresponding relation between the actual rotating speed value and the current value under different oil temperature conditions;
judging whether the current is smaller than the minimum current or not, and recording the judged time as a timing zero point;
and if the judgment result is yes, and the difference value between the timing time and the timing zero reaches 2000ms, judging that the load of the electric pump is too low.
With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where the method further includes:
acquiring an oil temperature signal and an actual rotating speed signal of an electric pump;
and establishing a corresponding table according to the oil temperature signal and the actual rotating speed signal.
With reference to the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, where the method further includes:
detecting whether the hardware of the electric pump has faults;
and when no hardware fault is detected, judging whether the current is less than the minimum current.
With reference to the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, where the method further includes:
detecting whether the electric pump is in a load debugging process;
and when the electric pump is detected to be in the load debugging process, judging whether the current is less than the minimum current.
With reference to the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where before comparing the current rotation speed with the calibrated rotation speed, the method further includes:
filtering the current rotating speed to obtain the filtered current rotating speed;
sampling the filtered current rotating speed according to a preset time interval to obtain the current rotating speed in a digital signal form;
and extracting the numerical value of the current rotating speed in the form of the digital signal to obtain the current rotating speed to be compared.
With reference to the second possible implementation manner of the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, where the method further includes:
when the hardware is detected to be faulty, a fault alarm signal is sent out.
In a second aspect, an embodiment of the present invention provides an electric pump underload fault diagnosis apparatus, including:
the acquisition module is used for acquiring the current rotating speed and current of the electric pump;
the rotating speed comparison module is used for comparing the current rotating speed with the calibrated rotating speed;
the table look-up module is used for looking up the minimum current in the corresponding table when the current rotating speed is greater than the calibrated rotating speed; the corresponding table comprises the corresponding relation between the actual rotating speed value and the current value under different oil temperature conditions;
the current judging module is used for judging whether the current is smaller than the minimum current or not and recording the judged time as a timing zero point;
and the load judgment module is used for judging that the load of the electric pump is too low when the judgment result is yes and the difference value between the timing time and the timing zero reaches 2000 ms.
With reference to the second aspect, an embodiment of the present invention provides a first possible implementation manner of the second aspect, where the method further includes:
the hardware fault detection module is used for detecting whether the hardware of the electric pump has a fault;
and the parallel judgment module is used for judging whether the current is less than the minimum current or not when the hardware is detected to have no fault.
In a third aspect, an embodiment of the present invention further provides a terminal, including a memory and a processor, where the memory is used to store a program that supports the processor to execute the electric pump underload fault diagnosis method provided in the above aspect, and the processor is configured to execute the program stored in the memory.
In a fourth aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to perform the steps of any one of the methods described above.
The embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides a method and a device for diagnosing an electric pump load underlow fault, wherein the method for diagnosing the electric pump load underlow fault comprises the following steps: firstly, acquiring the current rotating speed and the current of the electric pump, then comparing the current rotating speed with the calibrated rotating speed, and then searching the minimum current in a corresponding table when the current rotating speed is greater than the calibrated rotating speed, wherein the corresponding table comprises the corresponding relation between the actual rotating speed value and the current value under different oil temperature conditions; and then, judging whether the current is less than the minimum current, recording the judged time as a timing zero point, and judging that the load of the electric pump is too low when the judgment result is yes and the difference value between the timing time and the timing zero point reaches 2000 ms. Therefore, the technical scheme provided by the embodiment of the invention can relieve the defect of lack of a method for diagnosing the electric pump load fault in the prior art, and can diagnose the fault of the electric pump load which is too low.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 shows a first flowchart of an electric pump underload fault diagnosis method provided by an embodiment of the present invention;
FIG. 2 illustrates a second flow chart of an electric pump underload fault diagnostic method provided by an embodiment of the present invention;
fig. 3 shows a third flowchart of the electric pump load underlow fault diagnosis method provided by the embodiment of the present invention;
fig. 4 is a structural connection diagram of the electric pump load underfault diagnosis device provided by the embodiment of the invention.
Icon: 1-an acquisition module; 2-a rotation speed comparison module; 3-a table look-up module; 4-a current judgment module; and 5, a load judgment module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
At present, no effective solution exists for the problem that the load of the electric pump is too low in the using process.
Based on the above, the embodiments of the present invention provide a method and an apparatus for diagnosing an electric pump load underrun fault, which are described below by way of example.
Example 1
Referring to fig. 1, the method for diagnosing the electric pump load underlow fault provided by the embodiment of the invention specifically includes the following steps:
step S101: and acquiring the current rotating speed and current of the electric pump.
Specifically, the electric pump is provided with an electric pump controller, a rotating speed acquisition device and a current acquisition device, wherein the rotating speed acquisition device and the current acquisition device are respectively connected with the electric pump controller.
The rotating speed acquisition device is used for acquiring rotating speed information of the electric pump and transmitting the rotating speed information to the electric pump controller connected with the rotating speed acquisition device in real time.
The current acquisition device is used for acquiring current information of the electric pump and transmitting the current information to the electric pump connected with the current acquisition device in real time for control.
Further, the rotating speed acquisition device comprises a rotating speed sensor, and the current acquisition device comprises one of a current sensor, an ammeter, a universal meter or a current transformer.
In this embodiment, a current sensor is used as an example of the current collecting device.
The electric pump controller receives the current rotating speed (namely the rotating speed at the current moment) of the electric pump acquired by a rotating speed sensor arranged on the electric pump, and the electric pump controller receives the current rotating speed of the electric pump acquired by the rotating speed sensor.
Step S102: and comparing the current rotating speed with the calibrated rotating speed.
Specifically, after the electric pump controller obtains the current rotating speed of the electric pump, the current rotating speed is compared with the calibrated rotating speed, and the current rotating speed and the calibrated rotating speed are judged.
Further, a deviation value between the current rotating speed and the calibrated rotating speed can be calculated.
The calibration rotation speed refers to the preset rotation speed of the electric pump controller or the factory rotation speed of the electric pump.
When the current rotation speed is greater than the calibration rotation speed, that is, the deviation value between the current rotation speed and the calibration rotation speed is a positive value, step S103 is executed.
Step S103: the minimum current is looked up in the correspondence table.
Specifically, the electric pump controller stores a correspondence table in advance, and the correspondence table contains a correspondence relationship between an actual rotation speed value and a current value under different oil temperature conditions. The electric pump controller looks up the minimum current in the correspondence table.
Step S104: and judging whether the current is smaller than the minimum current or not, and recording the judged time as a timing zero point.
Specifically, the electric pump controller compares the obtained current of the electric pump with the minimum current obtained by looking up a table to judge whether the current is less than the minimum current, and starts timing by taking the judged moment as a timing zero point, so as to know the duration of the minimum current.
If the determination result is yes, that is, it is determined that the current is smaller than the minimum current, and the difference between the timing time and the timing zero (i.e., the timing duration) reaches the preset Delay time (Delay time), step S105 is executed.
The preset delay time can be set according to actual requirements.
It should be noted that the preset delay time should not be set too long or too short, because: when the preset delay time is too long, namely the current is less than the minimum current for a long time, the electric pump is operated at a low load for a long time, so that energy is wasted, the utilization efficiency of the electric pump is reduced, and even the electric pump is burnt out; when the preset delay time is set to be too short, the current is less than the minimum current in a short time, and the current fluctuates, so that the test result cannot be accurately obtained due to the too short current, and the accuracy of the judgment result is influenced.
Further, the preset delay time is set to 1500ms to 2500 ms.
In this embodiment, the preset delay time is set to 2000 ms.
Step S105: the load of the electric pump is determined to be too low.
Referring to fig. 2, on the basis of fig. 1, the electric pump load underlow fault diagnosis method provided by the present embodiment further includes:
step S201: a correspondence table is established in advance.
Specifically, the step S201 is specifically realized by one of the following manners:
mode A
A1 obtains the oil temperature signal and the actual rotating speed signal of the electric pump.
Specifically, the electric pump is further provided with a temperature acquisition device, the temperature acquisition device is connected with the electric pump controller, and the temperature acquisition device is used for acquiring an oil temperature signal of the electric pump and sending the oil temperature signal to the electric pump controller connected with the temperature acquisition device.
Further, the temperature acquisition device comprises a temperature sensor.
The electric pump controller receives an oil temperature signal sent by the temperature sensor and receives an actual rotating speed signal collected by the rotating speed sensor.
A2 establishes a corresponding table according to the oil temperature signal and the actual rotating speed signal.
Specifically, a current signal is obtained by calculating an input oil temperature signal and an actual rotating speed signal according to a preset relational expression, and the obtained current signal is correspondingly associated with the oil temperature signal and the actual rotating speed signal to establish a corresponding table.
The preset relation here may be: i = f (T, n). Where T represents the oil temperature and n represents the actual rotational speed. Specifically, I = KT + Mn, K, M are preset coefficients, which can be set according to the model and specification of the electric pump.
Mode B
B1 obtains the oil temperature signal, the actual rotating speed signal and the current signal of the electric pump.
Specifically, the electric pump controller receives an oil temperature signal sent by the temperature sensor, an actual rotating speed signal collected by the rotating speed sensor, and a current signal collected by the current sensor.
B2 establishing a corresponding table according to the oil temperature signal, the actual rotating speed signal and the current signal.
Further, in the step S102: before comparing the current rotating speed with the calibrated rotating speed, the method also comprises the following steps:
step S202: and preprocessing the current rotating speed.
Specifically, the step S202 is mainly executed by the following steps:
and a, filtering the current rotating speed to obtain the filtered current rotating speed.
Considering the situation that the collected current rotating speed has noise, the current rotating speed needs to be filtered, and noise interference is reduced.
And b, sampling the filtered current rotating speed according to a preset time interval to obtain the current rotating speed in a digital signal form.
The current speed is sampled in view of the fact that the current speed fluctuates between the start-up phase and the operation stabilization phase.
Specifically, the filtered current rotating speed is sampled according to a preset time interval to obtain a stable current rotating speed, and then analog-to-digital conversion is carried out on the sampled current rotating speed through a data acquisition card of the electric pump controller to obtain the current rotating speed of the digital signal.
And c, extracting the numerical value of the current rotating speed in the form of the digital signal to obtain the current rotating speed to be compared.
Referring to fig. 3, further on the basis of fig. 1, the electric pump underload fault diagnosis method further includes:
step S301: and detecting whether the hardware of the electric pump has a fault.
When no hardware failure is detected, step S104 is executed: and judging whether the current is smaller than the minimum current or not.
When a hardware failure is detected, step S302 is executed.
Step S302: and sending out a fault alarm signal.
Specifically, the electric pump controller is connected with an alarm device, the alarm device is used for sending an alarm signal to prompt a worker to notice, and the alarm information can be sent to the worker in a sound, light and short message mode.
In this embodiment, alarm device includes the sound-light integration alarm, and warning effect is good.
Further, the electric pump underload fault diagnosis method further comprises the following steps:
step S303: and detecting whether the electric pump is in a load debugging process.
The electric pump controller is connected with a load debugging key (Enable) to realize a load debugging function, and whether the electric pump is in the load debugging process is detected by judging the opening (pressing) or closing (lifting) state of the load debugging key.
When the electric pump is detected to be in the process of load debugging, that is, the load debugging button is in an on state, step S104 is executed: and judging whether the current is smaller than the minimum current or not.
In summary, the electric pump underload fault diagnosis method provided by this embodiment includes: firstly, acquiring the current rotating speed and the current of the electric pump, then comparing the current rotating speed with the calibrated rotating speed, and then searching the minimum current in a corresponding table when the current rotating speed is greater than the calibrated rotating speed, wherein the corresponding table comprises the corresponding relation between the actual rotating speed value and the current value under different oil temperature conditions; and then, judging whether the current is less than the minimum current, recording the judged time as a timing zero point, and judging that the load of the electric pump is too low when the judgment result is yes and the difference value between the timing time and the timing zero point reaches 2000 ms. Therefore, the technical scheme provided by the embodiment of the invention can relieve the defect of lack of a method for diagnosing the electric pump load fault in the prior art, and can diagnose the fault of the electric pump load which is too low.
Example 2
Referring to fig. 4, the present embodiment provides an electric pump underload fault diagnosis apparatus including: the device comprises an acquisition module 1, a rotating speed comparison module 2, a table look-up module 3, a current judgment module 4 and a load judgment module 5.
The obtaining module 1 is used for obtaining the current rotating speed and the current of the electric pump.
The rotating speed comparison module 2 is used for comparing the current rotating speed with the calibrated rotating speed.
The table look-up module 3 is used for looking up the minimum current in the corresponding table when the current rotating speed is greater than the calibrated rotating speed; the corresponding table comprises corresponding relations of actual rotating speed values and current values under different oil temperature conditions.
The current judging module 4 is configured to judge whether the current is smaller than the minimum current, and record the judged time as a timing zero point.
And the load judgment module 5 is used for judging that the load of the electric pump is too low when the judgment result is yes and the difference value between the timing time and the timing zero reaches 2000 ms.
In addition, the electric pump underload fault diagnosis device further includes:
the hardware fault detection module is used for detecting whether the hardware of the electric pump has a fault;
and the parallel judgment module is used for judging whether the current is less than the minimum current or not when the hardware is detected to have no fault.
The electric pump load underlow fault diagnosis device provided by the embodiment of the invention has the same technical characteristics as the electric pump load underlow fault diagnosis method provided by the embodiment, so that the same technical problems can be solved, and the same technical effect is achieved.
An embodiment of the present invention further provides a terminal, including a memory and a processor, where the memory is used to store a program that supports the processor to execute the method of the above embodiment, and the processor is configured to execute the program stored in the memory.
Embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to perform the steps of the above method.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The implementation principle and the generated technical effect of the method and the device for diagnosing the electric pump load underlow fault provided by the embodiment of the invention are the same as those of the method and the embodiment, and for the sake of brief description, the corresponding content in the method and the embodiment can be referred to where the embodiment of the device is not mentioned.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, each functional module or unit in each embodiment of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions or without necessarily implying any relative importance. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The electric pump load underlow fault diagnosis method is characterized by comprising the following steps:
acquiring the current rotating speed and current of the electric pump;
comparing the current rotating speed with the calibrated rotating speed;
when the current rotating speed is greater than the calibration rotating speed, searching the minimum current in a corresponding table; the corresponding table comprises the corresponding relation between the actual rotating speed value and the current value under different oil temperature conditions;
judging whether the current is smaller than the minimum current or not, and recording the judged time as a timing zero point;
and if the judgment result is yes, and the difference value between the timing time and the timing zero reaches 2000ms, judging that the load of the electric pump is too low.
2. The method for diagnosing an electric pump underload fault according to claim 1, further comprising:
acquiring an oil temperature signal and an actual rotating speed signal of an electric pump;
and establishing a corresponding table according to the oil temperature signal and the actual rotating speed signal.
3. The method for diagnosing an electric pump underload fault according to claim 1, further comprising:
detecting whether the hardware of the electric pump has faults;
and when no hardware fault is detected, judging whether the current is less than the minimum current.
4. The method for diagnosing an electric pump underload fault according to claim 1, further comprising:
detecting whether the electric pump is in a load debugging process;
and when the electric pump is detected to be in the load debugging process, judging whether the current is less than the minimum current.
5. The method for diagnosing the underloaded fault of the electric pump according to claim 1, wherein the comparing the current rotation speed with the calibrated rotation speed further comprises:
filtering the current rotating speed to obtain the filtered current rotating speed;
sampling the filtered current rotating speed according to a preset time interval to obtain the current rotating speed in a digital signal form;
and extracting the numerical value of the current rotating speed in the form of the digital signal to obtain the current rotating speed to be compared.
6. The method for diagnosing an electric pump underload fault according to claim 3, further comprising:
when the hardware is detected to be faulty, a fault alarm signal is sent out.
7. An electric pump underload fault diagnosis device, comprising:
the acquisition module is used for acquiring the current rotating speed and current of the electric pump;
the rotating speed comparison module is used for comparing the current rotating speed with the calibrated rotating speed;
the table look-up module is used for looking up the minimum current in a corresponding table when the current rotating speed is greater than the calibrated rotating speed; the corresponding table comprises the corresponding relation between the actual rotating speed value and the current value under different oil temperature conditions;
the current judging module is used for judging whether the current is smaller than the minimum current or not and recording the judged time as a timing zero point;
and the load judgment module is used for judging that the load of the electric pump is too low when the judgment result is yes and the difference value between the timing time and the timing zero reaches 2000 ms.
8. The electric pump underload fault diagnosis device according to claim 7, further comprising:
the hardware fault detection module is used for detecting whether the hardware of the electric pump has a fault;
and the parallel judgment module is used for judging whether the current is less than the minimum current or not when no hardware fault is detected.
9. A terminal, comprising a memory for storing a program that enables the processor to perform the method of any of claims 1 to 6 and a processor configured to execute the program stored in the memory.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of the claims 1 to 6.
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| CN113294328A (en) * | 2021-05-27 | 2021-08-24 | 盛瑞传动股份有限公司 | Fault diagnosis method for excessive difference in rotation speed of electric pump, electronic device, and storage medium |
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| JPH0510271A (en) * | 1991-07-04 | 1993-01-19 | Ebara Corp | Device for preventing light-load operation of pump device |
| JP5331843B2 (en) * | 2011-03-22 | 2013-10-30 | 日立オートモティブシステムズ株式会社 | Electric oil pump control device |
| CN104836205B (en) * | 2015-05-29 | 2018-02-16 | 许继集团有限公司 | Motor overload guard method and the electric machine control system using this method |
| CN106050638B (en) * | 2016-07-15 | 2018-10-26 | 珠海凌达压缩机有限公司 | A kind of appraisal procedure of compressor operating range |
| CN106597156B (en) * | 2016-12-12 | 2019-03-08 | 中国石油天然气集团公司 | Submersible electric pump load faulty judgment method, device and submersible electric pump recording instrument without paper |
| CN107508509B (en) * | 2017-08-11 | 2019-12-31 | 常州机电职业技术学院 | Brushless direct current motor control method and device and low-speed heavy-load control method thereof |
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