CN115111182A - Method and device for detecting running state of direct current fan and terminal equipment - Google Patents
Method and device for detecting running state of direct current fan and terminal equipment Download PDFInfo
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- CN115111182A CN115111182A CN202210778817.6A CN202210778817A CN115111182A CN 115111182 A CN115111182 A CN 115111182A CN 202210778817 A CN202210778817 A CN 202210778817A CN 115111182 A CN115111182 A CN 115111182A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
Abstract
The invention provides a method and a device for detecting the running state of a direct current fan and terminal equipment, wherein the method comprises the following steps: acquiring the terminal voltage of a target direct current fan and the rotating speed of the fan; inputting the generator terminal voltage and the fan rotating speed into a preset formula to obtain an actual rotating coefficient of the target direct current fan; the preset formula is obtained by derivation according to an armature circuit electromotive force balance equation of the direct-current fan; and detecting the running state of the target direct current fan according to the actual rotation coefficient and a preset rotation coefficient range. The method, the device and the terminal equipment for detecting the running state of the direct current fan can realize accurate detection of the running state of the direct current fan.
Description
Technical Field
The invention belongs to the technical field of state detection, and particularly relates to a method and a device for detecting the running state of a direct current fan and terminal equipment.
Background
In the prior art, when detecting the operating state of the dc fan, a certain parameter of the dc fan is usually obtained, and then each parameter is separately compared with a threshold corresponding to each parameter, so as to obtain the operating state of the dc fan. However, the detection method obviously does not take the relation among all parameters into consideration, so that the accuracy of the existing direct current fan running state detection scheme is not very high.
Disclosure of Invention
The invention aims to provide a method and a device for detecting the running state of a direct current fan and terminal equipment, and aims to solve the problem that the running state detection scheme of the direct current fan in the prior art is low in accuracy.
In a first aspect of the embodiments of the present invention, a method for detecting an operating state of a dc fan is provided, including:
acquiring the terminal voltage of a target direct current fan and the rotating speed of the fan;
inputting the generator terminal voltage and the fan rotating speed into a preset formula to obtain an actual rotating coefficient of the target direct current fan; the preset formula is obtained by derivation according to an armature circuit electromotive force balance equation of the direct-current fan;
and detecting the running state of the target direct current fan according to the actual rotation coefficient and a preset rotation coefficient range.
In a possible implementation manner, the preset formula is:
wherein, K fan And n is the rotating speed of the fan, and a and b are both preset coefficients.
In a possible implementation manner, the detecting the operation state of the target dc fan according to the actual rotation coefficient and a preset rotation coefficient range includes:
if the actual rotation coefficient is within a preset rotation coefficient range, judging that the target direct current fan is in a normal operation state;
and if the actual rotation coefficient is not within the preset rotation coefficient range, judging that the target direct current fan is in an abnormal operation state.
In one possible implementation, the types of abnormal operating conditions include sub-health conditions and disease conditions; after the target dc fan is determined to be in the abnormal operation state, the method for detecting the operation state of the dc fan further includes:
calculating the error amount of the actual rotation coefficient exceeding the rotation coefficient range;
if the error amount is larger than a preset first error threshold value, judging that the target direct current fan is in a disease state; if the error amount is smaller than a preset second error threshold value, judging that the target direct current fan is in a sub-health state;
wherein the first error threshold is greater than the second error threshold.
In one possible implementation manner, after determining that the target dc fan is in an abnormal operation state, the method for detecting the operation state of the dc fan further includes:
and if the error amount is in the range formed by the second error threshold and the first error threshold, judging the type of the abnormal operation state of the target direct current fan according to the actual rotation coefficient, the machine end voltage and the fan rotating speed.
In a possible implementation manner, the derivation process of the preset formula is:
acquiring an armature loop electromotive force balance equation of the direct current fan and a relational expression of fan torque and fan rotating speed corresponding to the direct current fan;
deducing a relational expression between the generator terminal voltage and the fan rotating speed corresponding to the direct current motor according to the armature loop electromotive force balance equation and the relational expression between the fan torque and the fan rotating speed;
and extracting a constant item in the relational expression between the generator terminal voltage and the rotating speed of the fan to one side of the equal sign, and taking the formula on the other side of the equal sign as a preset formula.
In one possible implementation, the preset rotation coefficient range is (K' fan -e，K′ fan +e)；
Wherein, K' fan And e is a preset error, and is a constant term on the equal sign side.
In a second aspect of the embodiments of the present invention, there is provided a device for detecting an operating state of a dc fan, including:
the data acquisition module is used for acquiring the terminal voltage of the target direct current fan and the rotating speed of the fan;
the coefficient calculation module is used for inputting the generator terminal voltage and the fan rotating speed into a preset formula to obtain the actual rotation coefficient of the target direct current fan; the preset formula is obtained by derivation according to an armature loop electromotive force balance equation of the direct-current fan;
and the state detection module is used for detecting the running state of the target direct current fan according to the actual rotation coefficient and a preset rotation coefficient range.
In a third aspect of the embodiments of the present invention, a terminal device is provided, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the steps of the method for detecting an operating state of a dc fan described above are implemented.
In a fourth aspect of the embodiments of the present invention, a computer-readable storage medium is provided, where a computer program is stored, and when the computer program is executed by a processor, the steps of the method for detecting an operating state of a dc fan are implemented.
The method, the device and the terminal equipment for detecting the running state of the direct current fan have the advantages that:
the method is characterized in that a preset formula is deduced in advance according to an armature loop electromotive force balance equation of the direct current fan, after the generator terminal voltage and the fan rotating speed of the direct current fan are obtained, the generator terminal voltage and the fan rotating speed are not directly compared with corresponding threshold values, the generator terminal voltage and the fan rotating speed are input into the preset formula, an actual rotation coefficient obtained by integrating the generator terminal voltage and the fan rotating speed is obtained through calculation, and the operating state of the direct current fan is judged according to the actual rotation coefficient and a preset rotation coefficient range. In other words, compared with the prior art, the method and the device can better consider the mutual influence among different parameters, so that the running state of the direct current fan can be better detected in a mode of 'single parameter comparison', and the running state detection accuracy of the direct current fan is effectively improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic flow chart illustrating a method for detecting an operating state of a dc fan according to an embodiment of the present invention;
fig. 2 is a block diagram of an operation state detection apparatus of a dc fan according to an embodiment of the present invention;
fig. 3 is a schematic block diagram of a terminal device according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following description is made by way of specific embodiments with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic flow chart of a method for detecting an operating state of a dc fan according to an embodiment of the present invention, where the method includes:
s101: and acquiring the terminal voltage and the rotating speed of the target direct current fan.
In this embodiment, the terminal voltage and the fan speed of the target dc fan can be collected and stored by data collection equipment such as a voltage sensor and an infrared sensor, and on this basis, the terminal voltage and the fan speed of the target dc fan can be directly obtained from the data collection equipment.
S102: and inputting the terminal voltage and the rotating speed of the fan into a preset formula to obtain the actual rotation coefficient of the target direct current fan. The preset formula is obtained by derivation according to an armature circuit electromotive force balance equation of the direct-current fan.
In this embodiment, the preset formula is a formula for calculating an actual rotation coefficient according to the generator-end voltage and the fan rotation speed, and the preset formula may be derived in advance from an armature loop electromotive force balance equation of the dc motor, wherein the coefficient of the preset formula may be calculated in a parameter calibration manner.
S103: and detecting the running state of the target direct current fan according to the actual rotation coefficient and a preset rotation coefficient range.
In a possible implementation manner of this embodiment, detecting the operation state of the target dc fan according to the actual rotation coefficient and the preset rotation coefficient range includes:
and if the actual rotation coefficient is within the preset rotation coefficient range, judging that the target direct current fan is in a normal operation state. And if the actual rotation coefficient is not in the preset rotation coefficient range, judging that the target direct current fan is in an abnormal operation state.
For example, the predetermined rotation coefficient range is (K) min ，K max ) Then K is satisfied at the actual rotation coefficient fan ＞K max Or K fan ＜K min In time, it indicates that the target dc fan is in an abnormal operating state (i.e., in a state of abnormal health).
In this embodiment, the abnormal operation state may be a fan disease state such as a stall of the fan and a blockage of foreign matter, or a fan sub-health state such as a degradation of the fan and a loss of a bearing, and is not limited herein.
The method can be obtained, and is different from the direct current fan running state detection scheme in the prior art, the preset formula is deduced in advance according to the armature loop electromotive force balance equation of the direct current fan, after the terminal voltage and the fan rotating speed of the direct current fan are obtained, the terminal voltage and the fan rotating speed are not directly compared with the corresponding threshold values, but the terminal voltage and the fan rotating speed are input into the preset formula, the actual rotating coefficient obtained by integrating the terminal voltage and the fan rotating speed is obtained through calculation, and the running state of the direct current fan is judged according to the actual rotating coefficient and the preset rotating coefficient range. That is to say, compared with the prior art, the embodiment of the invention can better consider the mutual influence among different parameters, so that the running state of the direct current fan can be better detected in a mode of 'single parameter comparison', and the running state detection accuracy of the direct current fan is effectively improved.
In one possible implementation, the preset formula is:
wherein, K fan The actual rotation coefficient is n, the fan rotating speed is n, and a and b are both preset coefficients.
In this embodiment, a and b can be obtained by obtaining multiple sets of test data calibration.
In one possible implementation, the types of abnormal operating conditions include sub-health conditions and disease conditions; after determining that the target dc fan is in the abnormal operation state, the operation state detection method of the dc fan may further include:
and calculating the error amount of the actual rotation coefficient exceeding the rotation coefficient range.
And if the error amount is larger than a preset first error threshold value, judging that the target direct current fan is in a disease state. And if the error amount is smaller than a preset second error threshold value, judging that the target direct current fan is in a sub-health state.
Wherein the first error threshold is substantially greater than the second error threshold.
In this embodiment, the rotation coefficients of the same type of dc fans are substantially the same, and when the actual rotation coefficients calculated by the individual dc fans are abnormally deviated (exceed the preset rotation coefficient range), it indicates that the torque or voltage exhibited by the dc fans at a specific rotation speed is abnormal, that is, the operation of the dc fans is abnormal. On the basis, the actual rotation coefficient is different from the rotation coefficient range, and the corresponding abnormal degree may also be different, that is, the specific type of the corresponding abnormal operating state may also be different. Therefore, the embodiment of the invention can judge the type of the normal operation state of the direct current fan according to the degree that the actual rotation coefficient exceeds the rotation coefficient range, so as to facilitate subsequent overhaul and maintenance.
In this embodiment, the first error threshold and the second error threshold may be set according to actual requirements.
In one possible implementation manner, after determining that the target dc fan is in the abnormal operation state, the method for detecting the operation state of the dc fan may further include:
if the error amount is between the range formed by the second error threshold and the first error threshold (namely, the error amount is not greater than the second error threshold and is not less than the first error threshold), judging the type of the abnormal operation state of the target direct current fan according to the actual rotation coefficient, the machine end voltage and the fan rotating speed.
In this embodiment, if the error amount is within the range formed by the second error threshold and the first error threshold, it may not be possible to directly determine the type of the abnormal operation state of the target dc fan according to the magnitude of the actual rotation coefficient (exceeding the rotation coefficient range), so that the determination may be performed by combining the generator terminal voltage and the fan rotation speed. For example, the actual rotation coefficient, the generator-end voltage and the fan rotation speed can be combined into a feature vector, and the feature vector is input into a preset deep learning model, so that the judgment of the abnormal state operation type, even the specific fan abnormal type, is realized. In this example, the generator terminal voltage and the fan rotation speed respectively represent two independent parameters, the actual rotation coefficient represents the comprehensive effect of the two independent parameters, and the three parameters form a feature vector to describe the features of the target direct current fan more comprehensively, so that the accurate judgment of the running state of the target direct current fan is realized.
In one possible implementation manner, after determining that the target dc fan is in the abnormal operation state, the method for detecting the operation state of the dc fan further includes:
and judging the abnormal type of the target direct current fan according to the actual rotation coefficient.
In this embodiment, the type of abnormality of the target dc fan may also be determined according to the magnitude of the actual rotation coefficient. It should be noted that, when the actual rotation coefficient is too large or too small, there may be more than one corresponding abnormal type, for example, the fan stalls, the foreign object is stuck, and the like, corresponding to the reduction of the fan rotation speed, and at this time, the actual rotation coefficient of the dc fan is abnormally increased. The fan is ageing, bearing loss etc. and corresponds the fan rotating impedance increase, needs bigger driving voltage under the same rotational speed, and the actual coefficient of rotation of direct current fan this moment also can increase, that is to say, when the actual coefficient of rotation of direct current fan increased unusually, probably because fan stall, foreign matter card die, also probably because fan is ageing, bearing loss. The essence of the embodiment of the present invention is to determine the range of the abnormal type according to the magnitude of the actual rotation coefficient, and if more accurate determination is needed, the determination may be performed by combining more parameters and thresholds (for example, in the foregoing embodiment, the more specific determination of the abnormal type may be implemented by forming the actual rotation coefficient, the generator terminal voltage, and the fan rotation speed into a feature vector and inputting the feature vector into a preset deep learning model). That is, in this embodiment, when the actual rotation coefficient is smaller than the minimum value corresponding to the rotation coefficient range, the dc fan corresponds to several types of abnormality, and when the actual rotation coefficient is larger than the maximum value corresponding to the rotation coefficient range, the dc fan corresponds to another several types of abnormality. Therefore, the possible abnormal type of the direct current fan can be judged based on the actual rotation coefficient of the direct current fan, and at least one abnormal type exists.
In one possible implementation, the derivation process of the preset formula is as follows:
and acquiring an armature loop electromotive force balance equation of the direct current fan and a relational expression of fan torque and fan rotating speed corresponding to the direct current fan.
And deducing to obtain a relational expression between the generator terminal voltage and the fan rotating speed corresponding to the direct current motor according to the armature loop electromotive force balance equation and the relational expression between the fan torque and the fan rotating speed.
And extracting a constant item in a relational expression between the terminal voltage and the rotating speed of the fan to one side of the equal sign, and taking a formula on the other side of the equal sign as a preset formula.
In this embodiment, the balance equation of the armature loop electromotive force of the dc fan is:
wherein U is the terminal voltage of the DC fan, E a Is the armature electromotive force of a DC fan, I a Is the armature current of the DC fan, R a Is the total equivalent resistance, C, of the armature circuit of the DC fan e Is the electromotive force constant of the DC fan, n is the fan speed of the DC fan, phi is the motor flux of the DC fan, T is the motor torque of the DC fan, C T Is the torque constant of the direct current fan.
In this embodiment, since the fan belongs to a quadratic load, and the torque thereof is directly proportional to the square of the fan rotation speed within a certain rotation speed range, the relationship between the fan torque and the fan rotation speed corresponding to the dc fan is as follows:
T＝kn 2
and k is a torque and rotating speed proportionality coefficient of the direct current fan.
On the basis, the relationship between the generator end voltage and the fan rotating speed corresponding to the direct current motor is derived according to an armature circuit electromotive force balance equation and the relationship between the fan torque and the fan rotating speed, which can be detailed as follows:
changing T to kn 2 Is substituted into
Obtaining a relational expression between the terminal voltage and the rotating speed of the fan corresponding to the direct current motor
In this embodiment, the
The constant term in the method is extracted to the equal sign side to obtain
On the basis of this, because
The electromotive force constant, the torque constant, the motor magnetic flux, the torque-rotation speed proportionality coefficient, and the like in the direct current fan are all the same constant, therefore,
can be simplified into
At this time, the other side of equal sign
I.e. a preset formula (i.e. a preset formula) for calculating the actual rotation coefficient.
In one possible implementation, the preset rotation coefficient range is (K' fan -e，K′ fan +e)。
Wherein, K' fan Is constant term (i.e. standard rotation coefficient) on the side of equal sign, and e is preSetting an error.
In the example of the derivation process, the standard rotation coefficient is 1 (i.e., K' fan Is 1), if the preset error e is set to 0.05, the preset rotation coefficient range may be set to (1-0.05, 1+ 0.05).
In this example, K' fan A value of 1 is the predetermined formula
The value of the corresponding standard rotation coefficient, and K 'when the preset formula is derived into other forms' fan The setting can be made according to the actual derivation result.
Fig. 2 is a block diagram of an operation state detection apparatus of a dc fan according to an embodiment of the present invention, which corresponds to the operation state detection method of the dc fan according to the above embodiment. For convenience of explanation, only portions related to the embodiments of the present invention are shown. Referring to fig. 2, the operating condition detecting device 20 of the dc fan includes: a data acquisition module 21, a coefficient calculation module 22 and a state detection module 23.
The data obtaining module 21 is configured to obtain a generator terminal voltage of the target dc fan and a fan rotation speed.
And the coefficient calculation module 22 is configured to input the generator-end voltage and the fan rotation speed into a preset formula, so as to obtain an actual rotation coefficient of the target dc fan. The preset formula is obtained by derivation according to an armature circuit electromotive force balance equation of the direct-current fan.
And the state detection module 23 is configured to detect an operating state of the target direct current fan according to the actual rotation coefficient and a preset rotation coefficient range.
In one possible implementation, the preset formula is:
wherein, K fan And n is the rotating speed of the fan, and a and b are both preset coefficients.
In a possible implementation manner, the state detection module 23 is specifically configured to:
and if the actual rotation coefficient is within the preset rotation coefficient range, judging that the target direct current fan is in a normal operation state.
And if the actual rotation coefficient is not in the preset rotation coefficient range, judging that the target direct current fan is in an abnormal operation state.
In a possible implementation manner, the types of the abnormal operation state include a sub-health state and a disease state, and the state detection module 23 is further configured to, after determining that the target dc fan is in the abnormal operation state, perform the following steps:
and calculating the error amount of the actual rotation coefficient exceeding the rotation coefficient range.
And if the error amount is larger than a preset first error threshold value, judging that the target direct current fan is in a disease state. And if the error amount is smaller than a preset second error threshold value, judging that the target direct current fan is in a sub-health state.
Wherein the first error threshold is greater than the second error threshold.
In a possible implementation manner, the state detection module 23 is further configured to, after determining that the target direct current fan is in an abnormal operation state, perform the following steps:
and if the error amount is between the range formed by the second error threshold and the first error threshold, judging the type of the abnormal operation state of the target direct current fan according to the actual rotation coefficient, the machine end voltage and the fan rotating speed. In a possible implementation manner, the coefficient calculating module 22 is further configured to derive a preset formula, where the derivation process of the preset formula is as follows:
and acquiring an armature loop electromotive force balance equation of the direct current fan and a relational expression of fan torque and fan rotating speed corresponding to the direct current fan.
And deducing to obtain a relational expression between the generator terminal voltage and the fan rotating speed corresponding to the direct current motor according to the armature loop electromotive force balance equation and the relational expression between the fan torque and the fan rotating speed.
And extracting a constant item in a relational expression between the terminal voltage and the rotating speed of the fan to one side of the equal sign, and taking a formula on the other side of the equal sign as a preset formula.
In one possible implementation, the preset rotation coefficient range is (K' fan -e，K′ fan +e)。
Wherein, K' fan And e is a preset error, and is a constant term on the equal sign side.
Referring to fig. 3, fig. 3 is a schematic block diagram of a terminal device according to an embodiment of the present invention. The terminal 300 in the present embodiment as shown in fig. 3 may include: one or more processors 301, one or more input devices 302, one or more output devices 303, and one or more memories 304. The processor 301, the input device 302, the output device 303, and the memory 304 are in communication with each other via a communication bus 305. The memory 304 is used to store a computer program comprising program instructions. Processor 301 is operative to execute program instructions stored in memory 304. Wherein the processor 301 is configured to call program instructions to perform the following functions of operating the modules/units in the above-described device embodiments, such as the functions of the modules 21 to 23 shown in fig. 2.
It should be understood that, in the embodiment of the present invention, the Processor 301 may be a Central Processing Unit (CPU), and the Processor may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-Programmable Gate arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The input device 302 may include a touch pad, a fingerprint sensor (for collecting fingerprint information of a user and direction information of the fingerprint), a microphone, etc., and the output device 303 may include a display (LCD, etc.), a speaker, etc.
The memory 304 may include a read-only memory and a random access memory, and provides instructions and data to the processor 301. A portion of the memory 304 may also include non-volatile random access memory. For example, the memory 304 may also store device type information.
In a specific implementation, the processor 301, the input device 302, and the output device 303 described in this embodiment of the present invention may execute the implementation manners described in the first embodiment and the second embodiment of the method for detecting an operating state of a dc fan provided in this embodiment of the present invention, and may also execute the implementation manners of the terminal described in this embodiment of the present invention, which is not described herein again.
In another embodiment of the present invention, a computer-readable storage medium is provided, in which a computer program is stored, where the computer program includes program instructions, and the program instructions, when executed by a processor, implement all or part of the processes in the method of the above embodiments, and may also be implemented by a computer program instructing associated hardware, and the computer program may be stored in a computer-readable storage medium, and the computer program, when executed by a processor, may implement the steps of the above methods embodiments. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution media, and the like. It should be noted that the computer readable medium may include any suitable increase or decrease as required by legislation and patent practice in the jurisdiction, for example, in some jurisdictions, computer readable media may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The computer readable storage medium may be an internal storage unit of the terminal of any of the foregoing embodiments, for example, a hard disk or a memory of the terminal. The computer readable storage medium may also be an external storage device of the terminal, such as a plug-in hard disk provided on the terminal, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like. Further, the computer-readable storage medium may also include both an internal storage unit and an external storage device of the terminal. The computer-readable storage medium is used for storing a computer program and other programs and data required by the terminal. The computer-readable storage medium may also be used to temporarily store data that has been output or is to be output.
Those of ordinary skill in the art will appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the components and steps of the various examples have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the terminal and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed terminal and method can be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces or units, and may also be an electrical, mechanical or other form of connection.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A method for detecting the operation state of a direct current fan is characterized by comprising the following steps:
acquiring the terminal voltage of a target direct current fan and the rotating speed of the fan;
inputting the generator terminal voltage and the fan rotating speed into a preset formula to obtain an actual rotating coefficient of the target direct current fan; the preset formula is obtained by derivation according to an armature circuit electromotive force balance equation of the direct-current fan;
and detecting the running state of the target direct current fan according to the actual rotation coefficient and a preset rotation coefficient range.
2. The method for detecting the operating state of the direct current fan according to claim 1, wherein the preset formula is as follows:
wherein, K fan And n is the rotating speed of the fan, and a and b are both preset coefficients.
3. The method for detecting the operating state of the dc fan according to claim 1, wherein the detecting the operating state of the target dc fan according to the actual rotation coefficient and a preset rotation coefficient range includes:
if the actual rotation coefficient is within a preset rotation coefficient range, judging that the target direct current fan is in a normal operation state;
and if the actual rotation coefficient is not within the preset rotation coefficient range, judging that the target direct current fan is in an abnormal operation state.
4. The method according to claim 3, wherein the types of abnormal operation states include a sub-health state and a disease state; after the target dc fan is determined to be in the abnormal operation state, the method for detecting the operation state of the dc fan further includes:
calculating the error amount of the actual rotation coefficient exceeding the rotation coefficient range;
if the error amount is larger than a preset first error threshold value, judging that the target direct current fan is in a disease state; if the error amount is smaller than a preset second error threshold value, judging that the target direct current fan is in a sub-health state;
wherein the first error threshold is greater than the second error threshold.
5. The method of detecting an operating state of a dc fan according to claim 4, wherein after determining that the target dc fan is in an abnormal operating state, the method of detecting an operating state of a dc fan further comprises:
and if the error amount is in the range formed by the second error threshold and the first error threshold, judging the type of the abnormal operation state of the target direct current fan according to the actual rotation coefficient, the machine end voltage and the fan rotating speed.
6. The method for detecting the operating state of the direct current fan according to claim 1, wherein the derivation process of the preset formula is as follows:
acquiring an armature loop electromotive force balance equation of the direct current fan and a relational expression of fan torque and fan rotating speed corresponding to the direct current fan;
deducing a relational expression between the generator terminal voltage and the fan rotating speed corresponding to the direct current motor according to the armature loop electromotive force balance equation and the relational expression between the fan torque and the fan rotating speed;
and extracting a constant item in a relational expression between the terminal voltage and the rotating speed of the fan to one side of the equal sign, and taking a formula on the other side of the equal sign as a preset formula.
7. The method of detecting an operating state of a direct current fan according to claim 6, wherein the predetermined rotation coefficient range is (K' fan -e，K′ fan +e)；
Wherein, K' fan And e is a preset error, and is a constant term on the equal sign side.
8. An operation state detection device of a direct current fan, characterized by comprising:
the data acquisition module is used for acquiring the terminal voltage of the target direct current fan and the rotating speed of the fan;
the coefficient calculation module is used for inputting the generator terminal voltage and the fan rotating speed into a preset formula to obtain an actual rotating coefficient of the target direct current fan; the preset formula is obtained by derivation according to an armature circuit electromotive force balance equation of the direct-current fan;
and the state detection module is used for detecting the running state of the target direct current fan according to the actual rotation coefficient and a preset rotation coefficient range.
9. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, in 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 claims 1 to 7.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116702649A (en) * | 2023-01-19 | 2023-09-05 | 武汉理工大学 | Vortex-induced vibration calculation method and device for rotary cylinder |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116702649A (en) * | 2023-01-19 | 2023-09-05 | 武汉理工大学 | Vortex-induced vibration calculation method and device for rotary cylinder |
| CN116702649B (en) * | 2023-01-19 | 2024-04-19 | 武汉理工大学 | Vortex-induced vibration calculation method and device for rotary cylinder |
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