CN114325382B - Method and system for detecting open-phase fault of three-phase alternating current motor and electric equipment - Google Patents
Method and system for detecting open-phase fault of three-phase alternating current motor and electric equipment Download PDFInfo
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- CN114325382B CN114325382B CN202111553405.4A CN202111553405A CN114325382B CN 114325382 B CN114325382 B CN 114325382B CN 202111553405 A CN202111553405 A CN 202111553405A CN 114325382 B CN114325382 B CN 114325382B
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Abstract
The invention relates to a method, a system and electric equipment for detecting the open-phase fault of a three-phase alternating current motor, which detects whether the motor has an over-current fault in real time in the normal operation process of the motor, counts once if the motor is judged to have the over-current fault, controls the motor to restart under the condition of power-on if the accumulated times are smaller than the preset times so as to judge whether the motor has the open-phase fault before the motor is started, determines the over-current fault as the open-phase over-current fault when the motor is judged to have the open-phase fault before the motor is started, and determines the over-current fault as the actual over-current fault if the accumulated times are larger than or equal to the preset times so as to solve the problem that the single-phase over-current fault and the actual over-current fault cannot be distinguished when the motor has the over-current fault in the prior art.
Description
Technical Field
The invention relates to the technical field of motor fault detection, in particular to a method and a system for detecting a phase-loss fault of a three-phase alternating current motor and electric equipment.
Background
Some three-phase alternating current motors have a phase or multiphase open circuit and phase failure condition in the starting or running process, wherein the motor cannot run due to the condition of two or three phases failure, but the condition of the multiphase failure is easier to detect and judge. The motor can drive the load by the other two-phase current when the motor lacks a single phase, the other two-phase current can be increased to exceed the limiting current when the motor lacks a single phase, and the overcurrent condition can be detected through current detection, but the actual overcurrent condition caused by other anomalies of the motor is confused with the overcurrent condition of the motor lacking a single phase, so that the motor is not well distinguished, and the technical workers are not well examined.
Disclosure of Invention
In view of the above, the present invention aims to provide a method, a system and an electric device for detecting a phase-failure fault of a three-phase ac motor, so as to solve the problem that in the prior art, when an overcurrent fault occurs in the motor, the phase-failure overcurrent fault and the actual overcurrent fault cannot be distinguished.
According to a first aspect of an embodiment of the present invention, there is provided a method for detecting a phase loss fault of a three-phase ac motor, including:
in the normal running process of the motor, detecting whether the motor has an overcurrent fault in real time, and counting once if the motor is judged to have the overcurrent fault;
if the accumulated times are smaller than the preset times, restarting the motor under the condition of power-on to judge whether the motor has a phase-failure fault before starting up, and determining that the overcurrent fault is the phase-failure overcurrent fault when judging that the motor has the phase-failure fault before starting up;
and if the accumulated times are greater than or equal to the preset times, judging that the overcurrent fault is an actual overcurrent fault.
Preferably, the judging whether the motor has a phase failure before starting up includes:
after the motor is electrified and before starting, setting an operating frequency of the motor larger than a frequency threshold;
acquiring a three-phase current sampling value of a motor under a given operating frequency;
calculating the average value of the absolute value of each phase current sampling value in a preset sampling period, and recording the average value as the average value of the corresponding phase current;
if the average value of the current of any phase is smaller than the current threshold value, judging that the phase-missing fault exists before the motor is started.
Preferably, the method further comprises:
in the normal operation process of the motor, detecting whether a phase failure exists in the operation process of the motor in real time comprises the following steps:
acquiring a three-phase current sampling value of a motor at the current operating frequency;
calculating the average value of the absolute value of each phase current sampling value in a preset sampling period, and recording the average value as the average value of the corresponding phase current;
if the average value of the current of any phase is smaller than the current threshold value, judging that the phase failure exists in the running process of the motor.
Preferably, the method further comprises:
after judging that the overcurrent fault is an actual overcurrent fault, sending out prompt information and stopping the machine; and/or the number of the groups of groups,
when judging that the phase failure exists before the motor is started, sending out prompt information and stopping the motor; and/or the number of the groups of groups,
and when judging that the phase failure exists in the running process of the motor, sending out prompt information and stopping the motor.
Preferably, the determining that the motor has an overcurrent fault includes:
acquiring a three-phase current sampling value of a motor at the current moment;
and judging whether the absolute value of each phase current sampling value at the current moment is larger than a current limiting value, and if the absolute value of any phase current sampling value is larger than the current limiting value, judging that an overcurrent fault exists.
Preferably, the current limit is set in dependence on the peak current at which the motor is operating at the maximum operating frequency.
Preferably, the acquiring three-phase current sampling values of the motor includes:
acquiring a two-phase current sampling value of the motor through a current sampling circuit;
and calculating a third phase current sampling value according to the two phase current sampling values obtained by sampling.
According to a second aspect of an embodiment of the present invention, there is provided a phase-loss fault detection system for a three-phase ac motor, including:
the detection module is used for detecting whether the motor has an overcurrent fault or not in real time in the normal running process of the motor, and counting once if the motor is judged to have the overcurrent fault;
the judging module is used for controlling the motor to restart under the condition of power-on if the accumulated times are smaller than the preset times so as to judge whether the motor has a phase-failure fault before starting up, and determining that the overcurrent fault is the phase-failure overcurrent fault when judging that the motor has the phase-failure fault before starting up;
and the method is also used for judging that the overcurrent fault is an actual overcurrent fault if the accumulated times are greater than or equal to the preset times.
According to a third aspect of an embodiment of the present invention, there is provided a powered device, including:
a three-phase motor and a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to:
in the normal running process of the motor, detecting whether the motor has an overcurrent fault in real time, and counting once if the motor is judged to have the overcurrent fault;
if the accumulated times are smaller than the preset times, restarting the motor under the condition of power-on to judge whether the motor has a phase-failure fault before starting up, and determining that the overcurrent fault is the phase-failure overcurrent fault when judging that the motor has the phase-failure fault before starting up;
and if the accumulated times are greater than or equal to the preset times, judging that the overcurrent fault is an actual overcurrent fault.
According to a fourth aspect of embodiments of the present invention, there is provided a computer-readable storage medium having stored thereon an erasable computer program;
when the computer program runs on the computer equipment, the computer equipment is caused to execute the three-phase alternating current motor open-phase fault detection method.
The technical scheme provided by the embodiment of the invention can comprise the following beneficial effects:
through detecting whether the motor has an overcurrent fault in real time in the normal operation process of the motor, if the motor is judged to have the overcurrent fault, counting once, if the accumulated number of times is smaller than the preset number of times, restarting the motor under the condition of controlling the motor to judge whether the motor has a phase-failure fault before starting up, and when judging that the motor has the phase-failure fault before starting up, determining that the overcurrent fault is the phase-failure overcurrent fault, and if the accumulated number of times is larger than or equal to the preset number of times, judging that the overcurrent fault is the actual overcurrent fault, thereby solving the problem that the single-failure overcurrent fault and the actual overcurrent fault cannot be distinguished when the motor has the overcurrent fault in the prior art.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a flow chart illustrating a method of detecting a phase loss fault in a three-phase AC motor according to an exemplary embodiment;
FIG. 2 is a flow chart illustrating open-phase fault detection at power-on in accordance with an exemplary embodiment;
FIG. 3 is a flow chart illustrating an over-current fault detection according to an exemplary embodiment;
fig. 4 is a flowchart illustrating a method for detecting a phase loss fault of a three-phase ac motor according to another exemplary embodiment;
FIG. 5 is a schematic block diagram of a three-phase AC motor open-phase fault detection system, according to an exemplary embodiment;
fig. 6 is a flow chart illustrating a processor of a powered device performing open-phase fault detection of a three-phase ac motor according to an exemplary embodiment.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the invention. Rather, they are merely examples of apparatus and methods consistent with aspects of the invention as detailed in the accompanying claims.
Example 1
Fig. 1 is a flowchart illustrating a method for detecting a phase loss fault of a three-phase ac motor according to an exemplary embodiment, as shown in fig. 1, the method including:
step S11, detecting whether the motor has an overcurrent fault in real time in the normal running process of the motor, and counting once if the motor is judged to have the overcurrent fault;
step S12, if the accumulated times are smaller than the preset times, restarting the motor under the condition of power-on, judging whether a phase-failure fault exists before the motor is started, and determining that the overcurrent fault is the phase-failure overcurrent fault when judging that the phase-failure fault exists before the motor is started;
and S13, if the accumulated times are greater than or equal to the preset times, judging that the overcurrent fault is an actual overcurrent fault.
It should be noted that, the technical scheme provided by the embodiment is suitable for the electric equipment with the three-phase alternating current motor. The electric equipment comprises: household appliances, and/or commercial appliances. Wherein the household appliances include, but are not limited to: fans, air conditioners, washing machines, sweeping robots, cooking machines, and the like.
The preset times are set according to the needs of users, or are set according to historical experience values, or are set according to experimental data, and are generally set to be positive integers larger than 1.
The step S12 is to restart the motor under the condition of power-up control, so as to avoid zero clearing the accumulated times. If the accumulated times is smaller than the preset times, the motor is controlled to restart (without power off) after the motor is stopped, so that after the motor is restarted, the system still memorizes the accumulated times before the motor is restarted.
It can be appreciated that, in the technical scheme provided by the embodiment, whether the motor has an overcurrent fault is detected in real time in the normal operation process of the motor, if the motor is judged to have the overcurrent fault, the motor is counted once, if the accumulated times are smaller than the preset times, the motor is controlled to restart under the condition of power-on so as to judge whether the motor has an open-phase fault before starting up, when the motor is judged to have the open-phase fault before starting up, the overcurrent fault is determined to be the open-phase overcurrent fault, and if the accumulated times are greater than or equal to the preset times, the overcurrent fault is judged to be the actual overcurrent fault, thereby solving the problem that the open-phase overcurrent fault and the actual overcurrent fault cannot be distinguished when the motor has the overcurrent fault in the prior art.
In specific practice, referring to fig. 2, the determining whether the phase failure exists before the motor is started includes:
after the motor is powered on, before starting, the motor is given an operating frequency (generally, a higher operating frequency is given);
acquiring three-phase current sampling values of the motor at a given operating frequency (it is understood that a high operating frequency is given to the motor before starting up, so that the motor cannot turn up and a small current is provided at the three-phase output end);
calculating the average value of the absolute value of each phase current sampling value in a preset sampling period, and recording the average value as a corresponding phase current average value (the preset sampling period can be one sampling period or a plurality of sampling periods, and calculating the influence of current fluctuation on the calculated current average value caused by the current average value of each phase in the preset sampling period in order to weaken interference);
if the average value of the current of any phase is smaller than the current threshold value, judging that the phase-missing fault exists before the motor is started.
Wherein, acquire the three-phase current sampling value of motor, include:
acquiring a two-phase current sampling value of the motor through a current sampling circuit;
and according to the two-phase current sampling value obtained by sampling, calculating a third phase current sampling value by combining the formula Ia+Ib+ic=0.
In specific practice, the method further comprises:
in the normal operation process of the motor, detecting whether a phase failure exists in the operation process of the motor in real time comprises the following steps:
acquiring a three-phase current sampling value of a motor at the current operating frequency;
calculating the average value of the absolute value of each phase current sampling value in a preset sampling period, and recording the average value as the average value of the corresponding phase current;
if the average value of the current of any phase is smaller than the current threshold value, judging that the phase failure exists in the running process of the motor.
In specific practice, the current threshold is set according to the needs of the user, or according to historical empirical values, or according to experimental data, typically to a value close to 0.
Preferably, the method further comprises:
after judging that the overcurrent fault is an actual overcurrent fault, sending out prompt information and stopping the machine; and/or the number of the groups of groups,
when judging that the phase failure exists before the motor is started, sending out prompt information and stopping the motor; and/or the number of the groups of groups,
and when judging that the phase failure exists in the running process of the motor, sending out prompt information and stopping the motor.
In specific practice, referring to fig. 3, the determining that the motor has an overcurrent fault includes:
acquiring a three-phase current sampling value of a motor at the current moment;
and judging whether the absolute value of each phase current sampling value at the current moment is larger than a current limiting value, and if the absolute value of any phase current sampling value is larger than the current limiting value, judging that an overcurrent fault exists.
In specific practice, the current limit is set in accordance with the peak current at which the motor operates at the maximum operating frequency. Preferably, a current limit value = peak current at which the motor operates at a maximum operating frequency is set.
Fig. 4 is a flowchart illustrating a method for detecting a phase loss fault of a three-phase ac motor according to another exemplary embodiment, as shown in fig. 4, the method including:
step S21, judging whether a phase failure exists before the motor is started;
step S22, if the phase-loss fault exists before the motor is started, the phase-loss fault is reported and the motor is stopped; if the phase failure does not exist, starting the motor;
step S23, detecting whether the motor has an overcurrent fault in real time in the normal running process of the motor, and counting once if the motor is judged to have the overcurrent fault; if no overcurrent fault exists, detecting whether a phase failure exists in the running process of the motor in real time;
step S24, if the accumulated times are smaller than the preset times, restarting the motor under the condition of power-on, judging whether a phase-failure fault exists before the motor is started, and determining that the overcurrent fault is the phase-failure overcurrent fault when judging that the phase-failure fault exists before the motor is started;
and S25, if the accumulated times are greater than or equal to the preset times, judging that the overcurrent fault is an actual overcurrent fault, reporting the actual overcurrent fault and stopping the machine.
It should be noted that, the technical scheme provided by the embodiment is suitable for the electric equipment with the three-phase alternating current motor. The electric equipment comprises: household appliances, and/or commercial appliances. Wherein the household appliances include, but are not limited to: fans, air conditioners, washing machines, sweeping robots, cooking machines, and the like.
It can be appreciated that, in the technical scheme provided by the embodiment, whether the motor has an overcurrent fault is detected in real time in the normal operation process of the motor, if the motor is judged to have the overcurrent fault, the motor is counted once, if the accumulated times are smaller than the preset times, the motor is controlled to restart under the condition of power-on so as to judge whether the motor has an open-phase fault before starting up, when the motor is judged to have the open-phase fault before starting up, the overcurrent fault is determined to be the open-phase overcurrent fault, and if the accumulated times are greater than or equal to the preset times, the overcurrent fault is judged to be the actual overcurrent fault, thereby solving the problem that the open-phase overcurrent fault and the actual overcurrent fault cannot be distinguished when the motor has the overcurrent fault in the prior art.
Example two
Fig. 5 is a schematic block diagram of a three-phase ac motor open-phase fault detection system 100, as shown in fig. 5, according to an exemplary embodiment, the system 100 comprising:
the detection module 101 is configured to detect, in real time, whether an overcurrent fault exists in the motor during normal operation of the motor, and count once if it is determined that the overcurrent fault exists in the motor;
the judging module 102 is configured to control restarting of the motor under the power-on condition if the accumulated number of times is less than the preset number of times, so as to judge whether a phase-failure exists before the motor is started, and determine that the overcurrent fault is a phase-failure overcurrent fault when judging that the phase-failure exists before the motor is started;
and the method is also used for judging that the overcurrent fault is an actual overcurrent fault if the accumulated times are greater than or equal to the preset times.
It should be noted that, the technical scheme provided by the embodiment is suitable for the electric equipment with the three-phase alternating current motor. The electric equipment comprises: household appliances, and/or commercial appliances. Wherein the household appliances include, but are not limited to: fans, air conditioners, washing machines, sweeping robots, cooking machines, and the like.
The implementation manner and the beneficial effects of each mode of this embodiment can be referred to the description of the related steps of the embodiment, and the description of this embodiment is omitted.
It can be appreciated that, in the technical scheme provided by the embodiment, whether the motor has an overcurrent fault is detected in real time in the normal operation process of the motor, if the motor is judged to have the overcurrent fault, the motor is counted once, if the accumulated times are smaller than the preset times, the motor is controlled to restart under the condition of power-on so as to judge whether the motor has an open-phase fault before starting up, when the motor is judged to have the open-phase fault before starting up, the overcurrent fault is determined to be the open-phase overcurrent fault, and if the accumulated times are greater than or equal to the preset times, the overcurrent fault is judged to be the actual overcurrent fault, thereby solving the problem that the open-phase overcurrent fault and the actual overcurrent fault cannot be distinguished when the motor has the overcurrent fault in the prior art.
Example III
A powered device is shown according to an exemplary embodiment, comprising:
a three-phase motor and a processor;
a memory for storing processor-executable instructions;
wherein, referring to fig. 6, the processor is configured to:
in the normal running process of the motor, detecting whether the motor has an overcurrent fault in real time, and counting once if the motor is judged to have the overcurrent fault;
if the accumulated times are smaller than the preset times, restarting the motor under the condition of power-on to judge whether the motor has a phase-failure fault before starting up, and determining that the overcurrent fault is the phase-failure overcurrent fault when judging that the motor has the phase-failure fault before starting up;
and if the accumulated times are greater than or equal to the preset times, judging that the overcurrent fault is an actual overcurrent fault.
It should be noted that, the electric equipment includes: household appliances, and/or commercial appliances. Wherein the household appliances include, but are not limited to: fans, air conditioners, washing machines, sweeping robots, cooking machines, and the like.
It can be appreciated that, in the technical scheme provided by the embodiment, whether the motor has an overcurrent fault is detected in real time in the normal operation process of the motor, if the motor is judged to have the overcurrent fault, the motor is counted once, if the accumulated times are smaller than the preset times, the motor is controlled to restart under the condition of power-on so as to judge whether the motor has an open-phase fault before starting up, when the motor is judged to have the open-phase fault before starting up, the overcurrent fault is determined to be the open-phase overcurrent fault, and if the accumulated times are greater than or equal to the preset times, the overcurrent fault is judged to be the actual overcurrent fault, thereby solving the problem that the open-phase overcurrent fault and the actual overcurrent fault cannot be distinguished when the motor has the overcurrent fault in the prior art.
Example IV
A computer readable storage medium having stored thereon a computer program that is erasable according to an exemplary embodiment is shown;
when the computer program runs on the computer equipment, the computer equipment is caused to execute the three-phase alternating current motor open-phase fault detection method.
It can be appreciated that, in the technical scheme provided by the embodiment, whether the motor has an overcurrent fault is detected in real time in the normal operation process of the motor, if the motor is judged to have the overcurrent fault, the motor is counted once, if the accumulated times are smaller than the preset times, the motor is controlled to restart under the condition of power-on so as to judge whether the motor has an open-phase fault before starting up, when the motor is judged to have the open-phase fault before starting up, the overcurrent fault is determined to be the open-phase overcurrent fault, and if the accumulated times are greater than or equal to the preset times, the overcurrent fault is judged to be the actual overcurrent fault, thereby solving the problem that the open-phase overcurrent fault and the actual overcurrent fault cannot be distinguished when the motor has the overcurrent fault in the prior art.
It is to be understood that the same or similar parts in the above embodiments may be referred to each other, and that in some embodiments, the same or similar parts in other embodiments may be referred to.
It should be noted that in the description of the present invention, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "plurality" means at least two.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. The method for detecting the open-phase fault of the three-phase alternating current motor is characterized by comprising the following steps of:
in the normal running process of the motor, detecting whether the motor has an overcurrent fault in real time, and counting once if the motor is judged to have the overcurrent fault;
if the accumulated times are smaller than the preset times, restarting the motor under the condition of power-on to judge whether the motor has a phase-failure fault before starting up, and determining that the overcurrent fault is the phase-failure overcurrent fault when judging that the motor has the phase-failure fault before starting up;
and if the accumulated times are greater than or equal to the preset times, judging that the overcurrent fault is an actual overcurrent fault.
2. The method of claim 1, wherein determining whether a phase loss fault exists before powering on the motor comprises:
after the motor is electrified and before starting, setting an operating frequency of the motor larger than a frequency threshold;
acquiring a three-phase current sampling value of a motor under a given operating frequency;
calculating the average value of the absolute value of each phase current sampling value in a preset sampling period, and recording the average value as the average value of the corresponding phase current;
if the average value of the current of any phase is smaller than the current threshold value, judging that the phase-missing fault exists before the motor is started.
3. The method as recited in claim 1, further comprising:
in the normal operation process of the motor, detecting whether a phase failure exists in the operation process of the motor in real time comprises the following steps:
acquiring a three-phase current sampling value of a motor at the current operating frequency;
calculating the average value of the absolute value of each phase current sampling value in a preset sampling period, and recording the average value as the average value of the corresponding phase current;
if the average value of the current of any phase is smaller than the current threshold value, judging that the phase failure exists in the running process of the motor.
4. A method according to claim 3, further comprising:
after judging that the overcurrent fault is an actual overcurrent fault, sending out prompt information and stopping the machine; and/or the number of the groups of groups,
when judging that the phase failure exists before the motor is started, sending out prompt information and stopping the motor; and/or the number of the groups of groups,
and when judging that the phase failure exists in the running process of the motor, sending out prompt information and stopping the motor.
5. The method of claim 1, wherein the determining that an over-current fault exists in the motor comprises:
acquiring a three-phase current sampling value of a motor at the current moment;
and judging whether the absolute value of each phase current sampling value at the current moment is larger than a current limiting value, and if the absolute value of any phase current sampling value is larger than the current limiting value, judging that an overcurrent fault exists.
6. The method of claim 5, wherein the step of determining the position of the probe is performed,
the current limit is set based on the peak current of the motor operating at the maximum operating frequency.
7. The method according to any one of claims 2 to 6, wherein the obtaining three-phase current samples of the motor comprises:
acquiring a two-phase current sampling value of the motor through a current sampling circuit;
and calculating a third phase current sampling value according to the two phase current sampling values obtained by sampling.
8. A phase-loss fault detection system for a three-phase ac motor, comprising:
the detection module is used for detecting whether the motor has an overcurrent fault or not in real time in the normal running process of the motor, and counting once if the motor is judged to have the overcurrent fault;
the judging module is used for controlling the motor to restart under the condition of power-on if the accumulated times are smaller than the preset times so as to judge whether the motor has a phase-failure fault before starting up, and determining that the overcurrent fault is the phase-failure overcurrent fault when judging that the motor has the phase-failure fault before starting up;
and the method is also used for judging that the overcurrent fault is an actual overcurrent fault if the accumulated times are greater than or equal to the preset times.
9. A powered device, comprising:
a three-phase motor and a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to:
in the normal running process of the motor, detecting whether the motor has an overcurrent fault in real time, and counting once if the motor is judged to have the overcurrent fault;
if the accumulated times are smaller than the preset times, restarting the motor under the condition of power-on to judge whether the motor has a phase-failure fault before starting up, and determining that the overcurrent fault is the phase-failure overcurrent fault when judging that the motor has the phase-failure fault before starting up;
and if the accumulated times are greater than or equal to the preset times, judging that the overcurrent fault is an actual overcurrent fault.
10. A computer readable storage medium having stored thereon a computer program that is erasable;
when the computer program is run on a computer device, the computer device is caused to perform the three-phase alternating current motor open-phase fault detection method as claimed in any one of claims 1 to 7.
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