Motor open-phase detection method and device, storage medium and electronic device

Abstract

The application discloses a motor open-phase detection method and device, a storage medium and an electronic device. The method comprises the following steps: collecting three-phase currents of a motor; determining an open-phase detection index value according to the three-phase currents, wherein the open-phase detection index value is determined by a first absolute value and a second absolute value, the first absolute value is the sum of the absolute values of the three-phase currents, and the second absolute value is the minimum value of the absolute values of the three-phase currents; comparing the open-phase detection index value with a preset threshold value to obtain a comparison result; and determining that the motor has an open-phase fault in response to the comparison result that the open-phase detection index value is less than the preset threshold value. The application solves the technical problems of low detection efficiency and poor applicability to different motors of the motor open-phase detection method provided by the related art.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and more specifically, to a method, apparatus, storage medium, and electronic device for detecting a phase loss in a motor. Background Technology

[0002] Three-phase speed-regulating motors typically use frequency converters as their power source. The frequency converter can provide a three-phase symmetrical circular rotating magnetic field to control the smooth rotation of the three-phase speed-regulating motor. When one of the normally connected lines of the frequency converter's three output lines is disconnected due to a fault, that is, when the frequency converter experiences a single-phase loss, the magnetic field generated by the frequency converter will change from a circular rotating magnetic field to a pulsating rotating magnetic field, which will lead to abnormal motor operation or equipment damage.

[0003] Currently, related technologies can detect single-phase loss faults in motors. However, the single-phase loss fault detection methods commonly used in these technologies usually require complex calculations, processing, and / or judgments on the collected three-phase currents. Furthermore, during the judgment process, it is usually necessary to set corresponding current thresholds according to different types and power ratings of motors, resulting in low efficiency in motor phase loss detection and poor applicability of the detection method to different motors.

[0004] As can be seen from the above analysis, there is currently no effective solution to the problems of low detection efficiency and poor applicability to different motors in the motor phase loss detection methods provided by the aforementioned related technologies. Summary of the Invention

[0005] This invention provides a method, apparatus, storage medium, and electronic device for detecting motor phase loss, thereby at least solving the technical problems of low detection efficiency and poor applicability to different motors in related technologies.

[0006] According to one aspect of the present invention, a method for detecting a phase loss in a motor is provided, comprising:

[0007] Collect the three-phase current of the motor; determine the phase loss detection index value based on the three-phase current, wherein the phase loss detection index value is determined by a first absolute value and a second absolute value, the first absolute value being the sum of the absolute values ​​of the three-phase current, and the second absolute value being the minimum absolute value of the three-phase current; compare the phase loss detection index value with a preset threshold to obtain the comparison result; in response to the comparison result, if the phase loss detection index value is less than the preset threshold, it is determined that the motor has a phase loss fault.

[0008] Optionally, determining the phase loss detection index value based on the three-phase current includes: calculating the absolute value of each of the three-phase currents; calculating the sum of the absolute values ​​of the three-phase currents to obtain a first absolute value; comparing the magnitudes of the absolute values ​​of the three-phase currents to determine the minimum absolute value of the three-phase currents as a second absolute value; calculating the difference between the first absolute value and the second absolute value to obtain a third absolute value; and determining the phase loss detection index value based on the ratio of the first absolute value to the third absolute value.

[0009] Optionally, the above-mentioned motor phase loss detection method further includes: limiting the amplitude of the third absolute value to a minimum value to obtain an updated third absolute value.

[0010] Optionally, the above-mentioned motor phase loss detection method further includes: amplifying the amplitude of the first absolute value to obtain an updated first absolute value.

[0011] Optionally, the phase loss detection index value is determined based on the ratio of the first absolute value to the third absolute value, including: selecting a target filter coefficient based on the amplitude characteristics and frequency fluctuation characteristics of the ratio; and performing smoothing filtering based on the comparison value of the target filter coefficient to obtain the phase loss detection index value.

[0012] Optionally, the above-mentioned motor phase loss detection method further includes: determining that the motor is operating normally in response to the comparison result indicating that the phase loss detection index value is greater than or equal to a preset threshold.

[0013] Optionally, the above-mentioned motor phase loss detection method further includes: in response to the comparison result determining that the phase loss detection index value is less than a preset threshold, issuing a phase loss fault alarm and implementing phase loss protection measures.

[0014] According to another aspect of the present invention, a motor phase loss detection device is also provided, comprising:

[0015] The system comprises: a data acquisition module for acquiring the three-phase current of the motor; a first determination module for determining the phase loss detection index value based on the three-phase current, wherein the phase loss detection index value is determined by a first absolute value and a second absolute value, the first absolute value being the sum of the absolute values ​​of the three-phase currents and the second absolute value being the minimum absolute value of the three-phase currents; a comparison module for comparing the phase loss detection index value with a preset threshold to obtain a comparison result; and a second determination module for determining, in response to the comparison result, that the phase loss detection index value is less than the preset threshold, thus determining that the motor has experienced a phase loss fault.

[0016] Optionally, the first determining module is further configured to: calculate the absolute values ​​of the three-phase currents respectively; calculate the sum of the absolute values ​​of the three-phase currents to obtain a first absolute value; compare the magnitudes of the absolute values ​​of the three-phase currents to determine the minimum absolute value of the three-phase currents as a second absolute value; calculate the difference between the first absolute value and the second absolute value to obtain a third absolute value; and determine the phase loss detection index value based on the ratio of the first absolute value to the third absolute value.

[0017] Optionally, the above-mentioned motor phase loss detection device further includes: a first limiting module, used to limit the amplitude of the third absolute value to a minimum value, so as to obtain an updated third absolute value.

[0018] Optionally, the above-mentioned motor phase loss detection device further includes: a second limiting module, used to amplify the amplitude of the first absolute value to obtain an updated first absolute value.

[0019] Optionally, the first determining module is further configured to: select target filtering coefficients based on the amplitude characteristics and frequency fluctuation characteristics of the ratio; and perform smoothing filtering processing based on the comparison value of the target filtering coefficients to obtain the phase loss detection index value.

[0020] Optionally, the above-mentioned motor phase loss detection device further includes: a third determining module, used to determine that the phase loss detection index value is greater than or equal to a preset threshold in response to the comparison result, and to determine that the motor is operating normally.

[0021] Optionally, the above-mentioned motor phase loss detection device further includes: a processing module, used to respond to the comparison result determining that the phase loss detection index value is less than a preset threshold, to issue a phase loss fault alarm and execute phase loss protection measures.

[0022] According to another aspect of the present invention, a computer-readable storage medium is also provided, wherein a computer program is stored in the computer-readable storage medium, and the computer program is configured to execute the motor phase loss detection method described in any of the preceding embodiments when run by a processor.

[0023] According to another aspect of the present invention, an electronic device is also provided, including a memory and a processor, wherein the memory stores a computer program and the processor is configured to run the computer program to perform the motor phase loss detection method described in any of the preceding embodiments.

[0024] In this embodiment of the invention, the three-phase current of the motor is first collected, and then the absolute value of each of the three-phase currents is calculated. Further, the minimum absolute value of the three-phase current is determined, and the sum of the absolute values ​​of the three-phase currents is calculated. Then, a phase loss detection index value is determined based on the minimum absolute value and the sum of the absolute values. Finally, the phase loss detection index value is compared with a preset threshold. When the phase loss detection index value is less than the preset threshold, it is determined that a single-phase loss fault has occurred in the motor. By simply and quickly processing the collected three-phase current of the motor to determine the single-phase loss detection index value, and judging this index value to determine whether a single-phase loss fault has occurred in the motor, the purpose of quickly detecting single-phase loss faults in the motor is achieved. This achieves the technical effect of improving the efficiency and versatility of single-phase loss detection methods, thereby solving the technical problems of low detection efficiency and poor applicability to different motors in related technologies. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0026] Figure 1 This is a hardware structure block diagram of an optional mobile terminal for a motor phase loss detection method according to an embodiment of the present invention.

[0027] Figure 2 This is a flowchart of a motor phase loss detection method according to an embodiment of the present invention;

[0028] Figure 3 This is a flowchart of an optional motor phase loss detection process according to an embodiment of the present invention;

[0029] Figure 4 This is a waveform diagram of an optional motor phase loss detection process according to an embodiment of the present invention;

[0030] Figure 5 This is a waveform diagram of another optional motor phase loss detection process according to an embodiment of the present invention;

[0031] Figure 6 This is a waveform diagram of another optional motor phase loss detection process according to an embodiment of the present invention;

[0032] Figure 7 This is a structural block diagram of a motor phase loss detection device according to an embodiment of the present invention. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0034] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0035] According to an embodiment of the present invention, a method embodiment for detecting a phase loss in a motor is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0036] Figure 1 This is a hardware structure block diagram of an optional mobile terminal for a motor phase loss detection method according to an embodiment of the present invention, such as... Figure 1 As shown, the mobile terminal 10 (or mobile device 10) may include one or more processors 102 (processor 102 may include, but is not limited to, processing devices such as microprocessors (MCUs) or field-programmable gate arrays (FPGAs),) a memory 104 for storing data, and a transmission device 106 for communication functions. In addition, it may also include: a display device 110, an input / output device 108 (i.e., I / O devices), a Universal Serial Bus (USB) port (which may be included as one of the ports of a computer bus, not shown in the figure), a network interface (not shown in the figure), a power supply (not shown in the figure), and / or a camera (not shown in the figure). Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal 10 described above. For example, the mobile terminal 10 may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0037] It should be noted that the aforementioned one or more processors 102 and / or other data processing circuits may be embodied, in whole or in part, as software, hardware, firmware, or any other combination thereof. Furthermore, the data processing circuitry may be a single, independent processing module, or may be wholly or partially integrated into any other element within the mobile terminal 10 (or mobile device 10).

[0038] The memory 104 can be used to store software programs and modules for application software, such as the program instructions / data storage device corresponding to the motor phase loss detection method in this embodiment of the invention. The processor 102 executes various functional applications and data processing by running the software programs and modules stored in the memory 104, thereby realizing the aforementioned motor phase loss detection method. The memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal 10 via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0039] The transmission device 106 is used to receive or send data via a network. Specific examples of the network described above may include a wireless network provided by the communication provider of the mobile terminal 10. In one example, the transmission device 106 includes a Network Interface Controller (NIC), which can connect to other network devices via a base station to communicate with the Internet. In another example, the transmission device 106 may be a Radio Frequency (RF) module, used for wireless communication with the Internet.

[0040] Under the above operating environment, the embodiments of the present invention provide as follows: Figure 2 The motor phase loss detection method shown is as follows: Figure 2 This is a flowchart of a motor phase loss detection method according to an embodiment of the present invention, such as... Figure 2 As shown, the method includes the following implementation steps:

[0041] Step S201: Collect the three-phase current of the motor;

[0042] Step S202: Determine the phase loss detection index value based on the three-phase current. The phase loss detection index value is determined by a first absolute value and a second absolute value. The first absolute value is the sum of the absolute values ​​of the three-phase currents, and the second absolute value is the minimum absolute value of the three-phase currents.

[0043] Step S203: Compare the phase loss detection index value with a preset threshold to obtain the comparison result;

[0044] Step S204: In response to the comparison result indicating that the phase loss detection index value is less than the preset threshold, it is determined that the motor has a phase loss fault.

[0045] The aforementioned motor can be a three-phase speed-regulating motor, which can use a frequency converter as its power source and rotate under the control of a circular rotating magnetic field generated by the frequency converter. It should be noted that a frequency converter can be used to convert industrial frequency electricity into alternating current with variable amplitude and frequency to achieve voltage and frequency regulation, thereby meeting different production needs. Furthermore, a circular rotating magnetic field is a magnetic field of constant magnitude that rotates in space at a fixed frequency. It is a fundamental condition for the mutual conversion between electrical energy and rotational mechanical energy and can be used in AC motors, measuring instruments, and other devices.

[0046] It should also be noted that in a system consisting of a frequency converter and a motor, when a phase is lost in one of the output lines of the frequency converter, the circular rotating magnetic field generated by the frequency converter becomes a pulsating rotating magnetic field. This pulsating rotating magnetic field is a magnetic field that changes in magnitude and rotates in space at a fixed frequency. In other words, when a phase is lost, the change in the magnetic field output by the frequency converter causes the motor current to become unbalanced, which not only leads to abnormal operation of the motor, but may also cause damage to the frequency converter due to the impact of the amplified current.

[0047] The aforementioned phase loss detection index value can be compared with a preset threshold. When the phase loss detection index value is less than the preset threshold, it can be determined that a single-phase loss fault has occurred in the motor. It should be noted that when a single-phase loss fault occurs in the motor, in order to ensure normal motor operation to meet production needs and to avoid damage to the motor, frequency converter, and other equipment, it is necessary to promptly issue a motor phase loss fault warning and implement motor phase loss protection measures. Specific methods for issuing motor phase loss fault warnings and implementing motor phase loss protection measures will be further explained in the embodiments described later, and will not be repeated here.

[0048] In this embodiment of the invention, the three-phase current of the motor is first collected, and then the absolute value of each of the three-phase currents is calculated. Further, the minimum absolute value of the three-phase current is determined, and the sum of the absolute values ​​of the three-phase currents is calculated. Then, a phase loss detection index value is determined based on the minimum absolute value and the sum of the absolute values. Finally, the phase loss detection index value is compared with a preset threshold. When the phase loss detection index value is less than the preset threshold, it is determined that a single-phase loss fault has occurred in the motor. By simply and quickly processing the collected three-phase current of the motor to determine the single-phase loss detection index value, and judging this index value to determine whether a single-phase loss fault has occurred in the motor, the purpose of quickly detecting single-phase loss faults in the motor is achieved. This achieves the technical effect of improving the efficiency and versatility of single-phase loss detection methods, thereby solving the technical problems of low detection efficiency and poor applicability to different motors in related technologies.

[0049] The methods described in the embodiments of the present invention will be further described below.

[0050] In an optional embodiment, in step S202, determining the phase loss detection index value based on the three-phase current includes:

[0051] Step S2021: Calculate the absolute values ​​of the three-phase currents respectively;

[0052] Step S2022: Calculate the sum of the absolute values ​​of the three-phase currents to obtain the first absolute value;

[0053] Step S2023: Compare the absolute values ​​of the three-phase currents to determine the minimum absolute value of the three-phase currents as the second absolute value;

[0054] Step S2024: Calculate the difference between the first absolute value and the second absolute value to obtain the third absolute value;

[0055] Step S2025: Determine the phase loss detection index value based on the ratio of the first absolute value to the third absolute value.

[0056] The following combination Figure 3 The above methods will be further explained.

[0057] Figure 3 This is a flowchart of an optional motor phase loss detection process according to an embodiment of the present invention, such as... Figure 3 As shown, before performing phase loss detection on the motor, it is first determined whether the detection conditions are effective. These detection conditions may include, but are not limited to: the wiring of the motor and other equipment is correct, the motor and other equipment are powered on and started, and the insulation performance of the motor is good. When the detection conditions are not effective, the motor phase loss detection process is not executed and the phase loss detection logic variable is output (for example, the output value is 0).

[0058] Still as Figure 3 As shown, when the detection conditions are in effect, the three-phase current of the motor (including: the first phase current, the second phase current, and the third phase current) is first collected, and the absolute value of each of the three phase currents is calculated. The minimum value among the absolute values ​​of the three phase currents is recorded as the second absolute value. At the same time, the sum of the absolute values ​​of the three phase currents is calculated, and the result is recorded as the first absolute value. Further, the difference between the first absolute value and the second absolute value is calculated to obtain the third absolute value. Then, the phase loss detection index value is determined based on the ratio of the first absolute value to the third absolute value.

[0059] In an optional embodiment, the above-described motor phase loss detection method further includes:

[0060] Step S205: Minimum value limit is applied to the amplitude of the third absolute value to obtain the updated third absolute value.

[0061] In the technical solution provided by this invention, in order to avoid the division overflow problem when calculating the ratio of the first absolute value to the third absolute value, a minimum value limit can be imposed on the amplitude of the third absolute value, for example, limiting the amplitude of the third absolute value to be greater than 0.

[0062] In an optional embodiment, the above-described motor phase loss detection method further includes:

[0063] Step S206: Amplify the magnitude of the first absolute value to obtain the updated first absolute value.

[0064] In the technical solution provided by this invention, in order to improve the clarity of the first absolute value in representing the single-phase loss fault phenomenon of the motor, the amplitude of the first absolute value can be amplified based on the minimum absolute value of the three-phase current without changing the fluctuation period of the first absolute value. Specifically: the absolute value of the first phase current is denoted as m1, the absolute value of the second phase current is denoted as m2, the absolute value of the third phase current is denoted as m3, and the minimum absolute value of the three-phase current is denoted as m min The minimum absolute value of the three-phase current, m min Let k be the amplification factor. Amplify the first absolute value to obtain the updated first absolute value as shown in the following formula (1):

[0065] M1 = m1 + m2 + m3 + k × m min Formula (1)

[0066] In the above formula (1), the magnitude amplification factor k of the first absolute value can be 0 or a positive number greater than 0.

[0067] The following combination Figure 4 , Figure 5 , Figure 6 The above methods will be further explained.

[0068] Figure 4 This is a waveform diagram of an optional motor phase loss detection process according to an embodiment of the present invention. Figure 5 This is a waveform diagram of another optional motor phase loss detection process according to an embodiment of the present invention. Figure 6 This is a waveform diagram of another optional motor phase loss detection process according to an embodiment of the present invention, such as... Figure 4 , Figure 5 , Figure 6 As shown, Figure 4 The three-phase currents shown are large currents, all with an absolute value greater than 1 ampere. Figure 5 , Figure 6 The three-phase currents shown are small currents, each with an absolute value less than 1 ampere. Figure 5 The difference is, Figure 6In this process, the amplitude of the first absolute value is amplified (amplification factor k = 1), so that when a single-phase loss fault occurs in the motor, the waveform change of the first absolute value can be observed to be more obvious.

[0069] In an optional embodiment, in step S2025, determining the phase loss detection index value based on the ratio of the first absolute value to the third absolute value includes:

[0070] Step S20251: Select the target filter coefficient based on the amplitude characteristics and frequency fluctuation characteristics of the ratio;

[0071] Step S20252: Perform smoothing filtering based on the target filter coefficient comparison value to obtain the phase loss detection index value.

[0072] As an optional implementation, to improve the stability of the phase loss detection index, the historical value of the ratio of the first absolute value to the third absolute value can be calculated based on the motor's historical current data (including historical current data during normal operation and historical current data during single-phase loss faults). Then, tools such as Fast Fourier Transform (FFT) can be used to analyze the amplitude and frequency fluctuation characteristics of this historical ratio. Based on the analysis results, the range of filtering coefficients is determined. Next, multiple different filtering coefficients are selected within this range for testing to evaluate the filtering effect of different coefficients. Based on this filtering effect, the optimal filtering coefficient (i.e., the target filtering coefficient) corresponding to the amplitude and frequency fluctuation characteristics of the current historical ratio can be determined. It should be noted that the optimal filtering coefficient can increase with the increase of the motor's operating frequency, thus the filtering effect is more significant when the motor's operating frequency is high, resulting in a faster response to the motor's phase loss protection mechanism.

[0073] In the above steps, it should also be noted that the smoothing filtering method used in this invention may include, but is not limited to: moving average filtering, weighted moving average filtering, median filtering, exponential smoothing filtering, and Kalman filtering.

[0074] As another optional implementation, when the amplitude amplification factor of the first absolute value is 0, the calculated ratio of the first absolute value to the third absolute value can vary in real time between 1 and 1.33; when the amplitude amplification factor of the first absolute value is 1, the calculated ratio of the first absolute value to the third absolute value can vary in real time between 1 and 1.66. It should also be noted that the fluctuation period of the ratio of the first absolute value to the third absolute value is 6 times the current frequency, and the cutoff frequency for smoothing and filtering this ratio can be 1 to 3 times the current operating frequency of the motor.

[0075] Still as Figure 4 , Figure 5 , Figure 6 As shown, the waveform of the ratio of the first absolute value to the third absolute value has large fluctuations. After smoothing the ratio, the smoothed value (i.e., the phase loss detection index value) has better waveform stability than before filtering.

[0076] In an optional embodiment, the above-described motor phase loss detection method further includes:

[0077] Step S207: In response to the comparison result, if the phase loss detection index value is greater than or equal to the preset threshold, the motor is determined to be operating normally.

[0078] As an optional implementation, the preset threshold can be in the range of 1.05 to 1.1. When the motor is running normally, the phase loss detection index value is greater than the preset threshold; when the motor experiences a single phase loss fault, the phase loss detection index value is less than the preset threshold. It is understood that the phase loss detection index value can eventually stabilize around 1.

[0079] In an optional embodiment, the above-described motor phase loss detection method further includes:

[0080] Step S208: In response to the comparison result determining that the phase loss detection index value is less than the preset threshold, a phase loss fault alarm is triggered and phase loss protection measures are implemented.

[0081] Still as Figure 3 As shown, after calculating the ratio of the first absolute value to the third absolute value, the ratio is smoothed and filtered to obtain the filtered value (i.e., the phase loss detection index value). Further, the filtered value is compared with the preset threshold. When the filtered value is greater than or equal to the preset threshold, it is determined that the motor is running normally and the single-phase loss fault of the motor is detected in real time. When the filtered value is less than the preset threshold, it is determined that the motor has a single-phase loss fault. At this time, the phase loss detection logic variable (e.g., the value is 1) can be output, and the phase loss fault alarm can be issued through display devices or audio devices to prompt the operator to deal with the motor phase loss fault in time.

[0082] In the above steps, it should also be noted that the phase loss protection measures may include, but are not limited to: stopping the motor, automatically switching to the backup power supply or the backup motor. Furthermore, when a single-phase loss fault occurs in the motor, relevant data on the single-phase loss fault can be recorded promptly to facilitate subsequent analysis of the fault cause and execution of the fault repair plan.

[0083] The motor phase loss detection method provided in the above embodiments of the present invention achieves the following technical effects:

[0084] (1) By performing simple calculations on the three-phase current of the motor, the motor phase loss detection index value can be quickly determined and it can be judged whether the motor has a single-phase loss fault. This reduces the complexity and calculation amount of motor phase loss detection and improves the efficiency of motor phase loss detection.

[0085] (2) It can avoid the influence of artificially injected harmonics or high-order harmonics during motor operation, thus improving the applicability of the motor phase loss detection method;

[0086] (3) It can be used on three-phase motors of different types and power ranges, which improves the versatility of the motor phase loss detection method;

[0087] (4) The ratio of the first absolute value to the third absolute value is smoothed by filtering, which improves the stability of the phase loss detection index value. Furthermore, the target filtering coefficient is selected based on the motor operation status (or: the amplitude characteristics and frequency fluctuation characteristics of the phase loss detection index), which improves the flexibility of the motor phase loss detection method and the response speed of the phase loss protection mechanism.

[0088] In this embodiment, a motor phase loss detection device is also provided. This device is used to implement the above embodiments and preferred embodiments, and details already described will not be repeated. As used below, a "module" is a combination of software and / or hardware that can perform a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0089] Figure 7 This is a structural block diagram of a motor phase loss detection device according to an embodiment of the present invention, such as... Figure 7 As shown, the device includes:

[0090] The acquisition module 701 is used to acquire the three-phase current of the motor;

[0091] The first determining module 702 is used to determine the phase loss detection index value based on the three-phase current, wherein the phase loss detection index value is determined by a first absolute value and a second absolute value, the first absolute value being the sum of the absolute values ​​of the three-phase currents and the second absolute value being the minimum absolute value of the three-phase currents.

[0092] Comparison module 703 is used to compare the phase loss detection index value with a preset threshold to obtain the comparison result;

[0093] The second determining module 704 is used to determine that the motor has a phase loss fault in response to the comparison result determining that the phase loss detection index value is less than a preset threshold.

[0094] Optionally, the first determining module is further configured to: calculate the absolute values ​​of the three-phase currents respectively; calculate the sum of the absolute values ​​of the three-phase currents to obtain the first absolute value; compare the magnitudes of the absolute values ​​of the three-phase currents to determine the minimum absolute value of the three-phase currents as the second absolute value; calculate the difference between the first absolute value and the second absolute value to obtain the third absolute value; and determine the phase loss detection index value based on the ratio of the first absolute value to the third absolute value.

[0095] Optionally, the above-mentioned motor phase loss detection device further includes: a first limiting module (not shown in the figure), used to limit the amplitude of the third absolute value to a minimum value, so as to obtain an updated third absolute value.

[0096] Optionally, the above-mentioned motor phase loss detection device further includes: a second limiting module (not shown in the figure), used to amplify the amplitude of the first absolute value to obtain an updated first absolute value.

[0097] Optionally, the first determining module 702 is further configured to: select target filtering coefficients based on the amplitude characteristics and frequency fluctuation characteristics of the ratio; and perform smoothing filtering processing based on the comparison value of the target filtering coefficients to obtain the phase loss detection index value.

[0098] Optionally, the above-mentioned motor phase loss detection device further includes: a third determining module (not shown in the figure), used to determine that the phase loss detection index value is greater than or equal to a preset threshold in response to the comparison result, and to determine that the motor is operating normally.

[0099] Optionally, the above-mentioned motor phase loss detection device further includes: a processing module (not shown in the figure), used to respond to the comparison result determining that the phase loss detection index value is less than a preset threshold, to issue a phase loss fault alarm and execute phase loss protection measures.

[0100] It should be noted that the above modules can be implemented by software or hardware. For the latter, they can be implemented in the following ways, but are not limited to: all the above modules are located in the same processor; or, the above modules are located in different processors in any combination.

[0101] According to another aspect of the present invention, a computer-readable storage medium is also provided, wherein a computer program is stored in the computer-readable storage medium, and the computer program is configured to execute the motor phase loss detection method described in any of the preceding embodiments when run by a processor.

[0102] Optionally, in this embodiment, the computer-readable storage medium may be configured to store a computer program for performing the following steps:

[0103] Step S1: Collect the three-phase current of the motor;

[0104] Step S2: Determine the phase loss detection index value based on the three-phase current. The phase loss detection index value is determined by the first absolute value and the second absolute value. The first absolute value is the sum of the absolute values ​​of the three-phase current, and the second absolute value is the minimum absolute value of the three-phase current.

[0105] Step S3: Compare the phase loss detection index value with the preset threshold to obtain the comparison result;

[0106] Step S4: In response to the comparison result, if the phase loss detection index value is less than the preset threshold, it is determined that the motor has a phase loss fault.

[0107] Optionally, in this embodiment, the computer-readable storage medium may include, but is not limited to, various media capable of storing computer programs, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0108] According to another aspect of the present invention, an electronic device is also provided, including a memory and a processor, wherein the memory stores a computer program and the processor is configured to run the computer program to perform the motor phase loss detection method described in any of the preceding embodiments.

[0109] Optionally, in this embodiment, the processor can be configured to perform the following steps via a computer program:

[0110] Step S1: Collect the three-phase current of the motor;

[0111] Step S2: Determine the phase loss detection index value based on the three-phase current. The phase loss detection index value is determined by the first absolute value and the second absolute value. The first absolute value is the sum of the absolute values ​​of the three-phase current, and the second absolute value is the minimum absolute value of the three-phase current.

[0112] Step S3: Compare the phase loss detection index value with the preset threshold to obtain the comparison result;

[0113] Step S4: In response to the comparison result, if the phase loss detection index value is less than the preset threshold, it is determined that the motor has a phase loss fault.

[0114] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments and their optional implementations, which will not be repeated here.

[0115] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0116] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0117] In the several embodiments provided by this invention, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection can be through some interfaces; the indirect coupling or communication connection of units or modules can be electrical or other forms.

[0118] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0119] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0120] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0121] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for detecting phase loss in a motor, characterized in that, include: Collect the three-phase current of the motor; Calculate the absolute values ​​of the three-phase currents respectively; Calculate the sum of the absolute values ​​of the three-phase currents to obtain the first absolute value; The absolute values ​​of the three-phase currents are compared, and the minimum absolute value of the three-phase currents is determined as the second absolute value. Calculate the difference between the first absolute value and the second absolute value to obtain the third absolute value; The phase loss detection index value is determined based on the ratio of the first absolute value to the third absolute value, wherein the phase loss detection index value is determined by the first absolute value and the second absolute value, the first absolute value being the sum of the absolute values ​​of the three-phase currents, and the second absolute value being the minimum absolute value of the three-phase currents. The phase loss detection index value is compared with a preset threshold to obtain the comparison result; In response to the comparison result, if the phase loss detection index value is less than the preset threshold, it is determined that the motor has a phase loss fault.

2. The motor phase loss detection method according to claim 1, characterized in that, The method further includes: The magnitude of the third absolute value is limited to a minimum value to obtain an updated third absolute value.

3. The motor phase loss detection method according to claim 1, characterized in that, The method further includes: The first absolute value is amplified to obtain an updated first absolute value.

4. The motor phase loss detection method according to claim 1, characterized in that, The phase loss detection index value is determined based on the ratio of the first absolute value to the third absolute value, including: Based on the amplitude and frequency fluctuation characteristics of the ratio, the target filter coefficient is selected; The ratio is smoothed by applying the target filtering coefficient to obtain the phase loss detection index value.

5. The motor phase loss detection method according to claim 1, characterized in that, The method further includes: In response to the comparison result, if the phase loss detection index value is greater than or equal to the preset threshold, it is determined that the motor is operating normally.

6. The method for detecting a missing phase in a motor according to claim 1, characterized in that, The method further includes: In response to the comparison result determining that the phase loss detection index value is less than the preset threshold, a phase loss fault alarm is triggered and phase loss protection measures are implemented.

7. A motor phase loss detection device, characterized in that, include: The acquisition module is used to acquire the three-phase current of the motor; The first determining module is used to calculate the absolute values ​​of the three-phase currents respectively; The sum of the absolute values ​​of the three-phase currents is calculated to obtain a first absolute value; the magnitudes of the absolute values ​​of the three-phase currents are compared to determine the minimum absolute value of the three-phase currents as a second absolute value; the difference between the first absolute value and the second absolute value is calculated to obtain a third absolute value; a phase loss detection index value is determined based on the ratio of the first absolute value to the third absolute value, wherein the phase loss detection index value is determined by the first absolute value and the second absolute value, the first absolute value being the sum of the absolute values ​​of the three-phase currents, and the second absolute value being the minimum absolute value of the three-phase currents; The comparison module is used to compare the phase loss detection index value with a preset threshold to obtain a comparison result; The second determining module is used to determine, in response to the comparison result, that the phase loss detection index value is less than the preset threshold, and to determine that the motor has a phase loss fault.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, wherein the computer program is configured to execute the motor phase loss detection method according to any one of claims 1 to 6 when run by a processor.

9. An electronic device comprising a memory and a processor, characterized in that, The memory stores a computer program, and the processor is configured to run the computer program to perform the motor phase loss detection method according to any one of claims 1 to 6.

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