CN110703096A - Motor working state detection method, device, equipment and storage medium - Google Patents
Motor working state detection method, device, equipment and storage medium Download PDFInfo
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- CN110703096A CN110703096A CN201911040436.2A CN201911040436A CN110703096A CN 110703096 A CN110703096 A CN 110703096A CN 201911040436 A CN201911040436 A CN 201911040436A CN 110703096 A CN110703096 A CN 110703096A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The embodiment of the invention discloses a method, a device, equipment and a storage medium for detecting the working state of a motor, wherein the method for detecting the working state of the motor comprises the following steps: setting a reference voltage value according to the rated voltage of the motor; monitoring three-phase voltage of the motor in the running process of the motor, and acquiring a minimum voltage value and a minimum voltage phase to which the minimum voltage value belongs; and comparing the minimum voltage value with other two-phase voltage values and the reference voltage value respectively to determine the working state of the motor. The embodiment of the invention sets the reference voltage value of the motor protection device based on the rated voltages of different motors, thereby realizing the support of protecting the motors with various voltage standards. And the three-phase voltage value of the motor is monitored in the running process of the motor, the working state of the motor is determined according to the comparison between the monitoring value and the reference voltage value, and the accuracy of judging the phase-lacking working state of the motor in the running process of the motor is improved.
Description
Technical Field
The embodiment of the invention relates to the field of motor application, in particular to a method, a device, equipment and a storage medium for detecting the working state of a motor.
Background
With the gradual development of the industry, three-phase alternating current motors are used more and more frequently on industrial equipment, and the three-phase alternating current motors have some faults in use to cause the working state of the motors to be in a problem. If lack looks, phase unbalance, motor winding temperature height etc. fail to in time stop the motor when motor operating condition goes wrong and can cause the motor to damage even personnel are injured.
At present, the detection aiming at the working state of the motor mainly comprises the phase loss, the phase sequence phase error, the phase imbalance and the overhigh temperature of the motor of the three-phase motor.
However, the phase-missing detection mainly aims at detection before the motor runs, when the motor lacks one-phase voltage input in the running process, because the motor does not stop, the motor rotates to generate voltage at one phase end of the phase-missing, namely, a regenerative power supply, so that the phase-missing end can still detect the existence of the voltage, and the voltage value is very high, so that the common phase-missing detection method cannot detect the phase-missing problem of the motor in the running process, and the motor is powered by only two-phase voltage, so that the motor is overheated and fails.
Disclosure of Invention
The embodiment of the invention provides a method, a device, equipment and a storage medium for detecting the working state of a motor, which are used for ensuring the accuracy of determining the working state of the motor.
In a first aspect, an embodiment of the present invention provides a method for detecting a working state of a motor, where the method is performed by a motor protection device, where the motor protection device is connected to the motor, and the method includes:
setting a reference voltage value according to the rated voltage of the motor;
monitoring three-phase voltage of the motor in the running process of the motor, and acquiring a minimum voltage value and a minimum voltage phase to which the minimum voltage value belongs;
and comparing the minimum voltage value with other two-phase voltage values and the reference voltage value respectively to determine the working state of the motor.
In a second aspect, an embodiment of the present invention further provides a device for detecting a working state of a motor, where the device is implemented by a motor protection device, and the motor protection device is connected to the motor, and includes:
the reference voltage value setting module is used for setting a reference voltage value according to the rated voltage of the motor;
the minimum voltage phase acquisition module is used for monitoring three-phase voltages of the motor in the running process of the motor and acquiring a minimum voltage value and a minimum voltage phase to which the minimum voltage value belongs;
and the working state determining module is used for comparing the minimum voltage value with other two-phase voltage values and the reference voltage value respectively to determine the working state of the motor.
In a third aspect, an embodiment of the present invention further provides a computer device, including:
one or more processors;
a storage device for storing one or more programs,
when the one or more programs are executed by the one or more processors, the one or more processors implement the motor operating state detection method according to any embodiment of the present invention.
In a fourth aspect, the embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method for detecting the operating state of a motor according to any embodiment of the present invention.
The embodiment of the invention sets the reference voltage value of the motor protection device based on the rated voltages of different motors, thereby realizing the support of protecting the motors with various voltage standards. And the three-phase voltage value of the motor is monitored in the running process of the motor, the working state of the motor is determined according to the comparison between the monitoring value and the reference voltage value, and the accuracy of judging the phase-lacking working state of the motor in the running process of the motor is improved.
Drawings
Fig. 1 is a flowchart of a method for detecting an operating state of a motor according to a first embodiment of the present invention;
fig. 2 is a flowchart of a motor operating state detection method according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a motor operating state detection device in a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of a computer device in the fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a flowchart of a method for detecting a working state of a motor according to a first embodiment of the present invention, where the method is implemented by a motor protection device, where the motor protection device is connected to the motor, and is applicable to a situation where a working state of the motor is detected during a running process of the motor. The method can be executed by a motor working state detection device, which can be implemented in a software and/or hardware manner and can be configured in computer equipment, for example, the computer equipment can be equipment with communication and computing capabilities, such as a background server. As shown in fig. 1, the method specifically includes:
and 101, setting a reference voltage value according to the rated voltage of the motor.
The rated voltage of the motor refers to an optimal voltage when the electrical equipment normally works for a long time, and the rated voltage is also called a nominal voltage. When the operating voltage of the electrical equipment is higher than the rated voltage, the equipment is easily damaged, and when the operating voltage is lower than the rated voltage, the equipment cannot normally operate, so that the operating voltage of the electrical equipment needs to be monitored. The reference voltage value is a voltage value set for the motor protection device according to the rated voltage of the motor to be protected and is used for providing a comparison standard for the working voltage of the motor during operation. Different reference voltage values are set according to rated voltages of different motors, so that the reference voltage can be set pertinently according to the protected motor, and the phenomenon that the motors with special working voltages cannot be protected is avoided.
Optionally, setting a reference voltage value according to the rated voltage of the motor includes:
if the motor is in a reference voltage setting mode after being started, taking a voltage value input by a user as the reference voltage value;
and if the motor is in a non-reference voltage setting mode after being started, taking a pre-stored voltage value as the reference voltage value.
Specifically, after the motor connected to the motor protection device is started, if the motor protection device is in the reference voltage setting mode, the motor protection device reads a voltage value input by a user as a new reference voltage, and stores the new reference voltage in the device, so that the subsequent motor is directly read after being restarted, and the efficiency of protecting the motor is improved. Optionally, the step of reading the voltage value input by the user may take an action corresponding to receiving preset different reference voltages, for example, different buttons may be preset, the different buttons represent different reference voltage values, and when one of the buttons is triggered, the corresponding reference voltage value is mapped.
If the motor protection device is in the non-reference voltage setting mode, the motor protection device directly reads the reference voltage stored in the device, and the stored reference voltage is the reference voltage set according to the motor connected last time. The non-reference voltage setting mode is generally applied to keeping the consistency between the motor connected with the motor protection device and the last time or keeping the consistency between the rated voltage and the motor connected with the motor protection device, so that the condition that the reference voltage needs to be set every time the motor is connected is avoided; the reference voltage setting mode is applied to the situation that a motor connected at present is different from a motor connected at last in specification, if rated voltages are different, the reference voltage needs to be set in a targeted mode for a new motor, so that the working voltage of the motor can be monitored in a targeted mode, and the working state can be further determined.
For example, after detecting that the level of the voltage setting input pin is increased, it is determined to enter the reference voltage setting mode, for example, after the motor is powered on and started, first read the last set reference voltage value stored in the motor protection device FLASH as the voltage reference value, and monitor the voltage setting input pin all the time, if it is detected that the level of the voltage setting input pin is increased, then enter the reference voltage setting mode, and determine the set reference voltage value according to the time length of the level increase, for example, the range of the reference voltage that can be set is 110VAC-480VAC, different times of the level increase map different reference voltage values, and write the newly obtained value as the reference voltage value into the FLASH.
And 102, monitoring three-phase voltages of the motor in the running process of the motor, and acquiring a minimum voltage value and a minimum voltage to which the minimum voltage value belongs.
The motor running process refers to that the motor is in a running state after being powered on, and does not include a non-running state after being powered on. The three-phase voltage refers to the voltage between the phases of a three-phase motor, various voltage standards exist in various countries around the world, the three-phase voltage is 220VAC, and the three-phase voltage is 380 VAC.
Specifically, in the running process of the motor, the motor protection device monitors three-phase voltage values of the motor at intervals, finds the phase with the minimum value in the three-phase voltages, and records the minimum voltage value. In the running process of the motor, when the three-phase motor lacks one-phase voltage input, the motor does not stop running at the moment, and on the contrary, the existence of voltage can still be detected in the phase lacking of the motor when the motor runs, and the voltage value is not very low, so that the difficulty is brought to the phase lacking detection in the running process. However, as long as three-phase voltages exist in the motor operation process caused by phase failure, the voltage value generated by the phase failure is necessarily lower than the voltage values of other two phases, so that the minimum voltage value in the three-phase voltages and the minimum voltage value to which the minimum voltage value belongs are found, and the minimum voltage value is convenient to analyze subsequently.
And 103, comparing the minimum voltage value with other two-phase voltage values and the reference voltage value respectively to determine the working state of the motor.
The working state refers to the operation state of the motor judged by the motor protection device, and includes normal operation and abnormal operation, and optionally, the abnormal operation includes that the working state of the motor is open-phase.
Specifically, after the minimum voltage of three-phase voltage and the minimum voltage value of the three-phase voltage in the motor operation process are found, the range of other two-phase voltage values deviating from the reference voltage is judged, if the deviation degree is within a preset allowable range, the minimum voltage value is directly compared with the reference voltage value, and when the minimum voltage value exceeds a preset threshold value of the reference voltage value, the working state of the motor is determined to be open-phase; if the range of other two-phase voltage values deviating from the reference voltage exceeds the preset allowable range, the reference voltage value compared with the minimum voltage value is adjusted according to the deviation degree, and the working state of the motor is determined to be open-phase after the minimum voltage value exceeds the preset threshold value of the adjusted reference voltage value.
Optionally, comparing the minimum voltage value with other two-phase voltage values and the reference voltage to obtain a working state of the motor, including:
when the minimum voltage value is lower than the reference voltage value and the difference value is larger than the threshold value, determining the minimum voltage as a regeneration power supply, wherein the working state of the motor is a phase failure; and adjusting the threshold value according to the voltage values of the other two phases.
The threshold is a preset default phase judgment standard and can be set according to a national standard, such as 7% of the reference voltage. The regenerative power phase is a phase in which a voltage value is generated in a phase lacking a phase during the operation of the motor.
For example, when the rated voltage of the motor is 220VAC, the reference voltage is also set to be 220VAC, the threshold value is set to be 15VAC, when the three-phase voltage values are monitored to be 210VAC, 203VAC and 195VAC respectively, the minimum voltage value is found to be 195VAC, the difference value with the reference voltage is 25VAC, and if the difference value is greater than the threshold value 15VAC, the phase corresponding to 195VAC is determined to be a regenerated power supply, and the working state of the motor is a phase failure. And the threshold is adjusted according to the voltage values of the other two phases, and when the voltage values of the other two phases are smaller or larger, namely deviate from the preset range of the reference voltage value, the threshold is adjusted according to the deviation degree. Optionally, the value of the threshold may be a value obtained by adding a deviation of the average value of the voltages of the other two phases from the reference voltage to the basic threshold, for example, the three-phase voltage values are 210VAC, 203VAC and 195VAC, respectively, the threshold is 7% of the reference voltage value plus a difference between the average value of the other two phases and the reference voltage value, the threshold is calculated as 29VAC, and if the difference between the 195VAC and the reference voltage does not exceed a new threshold, the phase to which the 195VAC belongs cannot be determined as the regenerative power source. Optionally, the value of the threshold is adjusted according to the deviation range of the other two phases from the reference voltage, for example, when the other two phases are within the preset range of the reference voltage, the threshold is 7% of the reference voltage value; when the other two phases are outside the preset range of the reference voltage, the threshold is 7% of the value of the reference voltage plus the difference between the other two phases and the reference voltage.
Adjusting the threshold value according to the values of the other two phases can improve the accuracy of the detection of the regenerated power supply. The regenerative power supply is caused by the existence of other two phases in the motor operation, so the regenerative power supply can change along with the change of voltage values of the other two phases, the detection of the regenerative power supply is too one-sided simply according to a set threshold value, when the other two phases are higher than the reference voltage value to a certain degree, the difference between the regenerative power supply phase and the reference voltage value is very small, and the judgment is carried out according to the fixed threshold value, so the detection cannot be carried out.
The embodiment of the invention automatically sets the reference voltage value of the motor protection device based on the rated voltages of different motors, thereby realizing the support of protecting the motors with various voltage standards. And the three-phase voltage value of the motor is monitored in the running process of the motor, the working state of the motor is determined according to the comparison between the monitored value and the reference voltage value, and the accuracy of judging the phase-lacking working state of the motor in the running process of the motor is improved. The condition that the motor generates a regenerative power supply due to phase loss in the operation of the motor is detected, and the condition that the motor is overheated due to only two-phase electric input of the motor is effectively avoided.
Example two
Fig. 2 is a flowchart of a motor operating state detection method in the second embodiment of the present invention, and the second embodiment is further optimized based on the first embodiment. As shown in fig. 2, the method includes:
step 201, setting a reference voltage value according to the rated voltage of the motor.
Step 202, in the running process of the motor, monitoring three-phase voltages of the motor, and acquiring a minimum voltage value and a minimum voltage to which the minimum voltage value belongs.
And step 203, comparing the minimum voltage value with other two-phase voltage values and the reference voltage value respectively to determine the working state of the motor.
Optionally, after setting the reference voltage value according to the rated voltage of the motor, the method further includes at least one of the following steps:
if the motor is detected to have two-phase angle overlapping, determining that the working state of the motor is phase sequence phase error;
if the motor is detected to lack one phase in three-phase voltage before running, determining that the working state of the motor is a phase lack state;
if the voltage value of at least one phase of the three-phase voltage of the motor is detected to exceed the preset voltage alarm range of the reference voltage, determining that the working state of the motor is phase imbalance;
if the detected temperature value of the motor exceeds the preset normal temperature range, determining the working state of the motor as motor overheating;
and if the resistance value of the motor temperature sensor circuit is detected to be zero or infinite, determining that the working state of the motor is a temperature sensor short circuit or an open circuit.
The motor protection device can detect the phase loss of the motor in the operation process, and can also detect the phase sequence phase failure of the motor, the phase loss before operation, the phase imbalance, overheating, and the short circuit or the open circuit of the temperature sensor. The multifunctional detection of the motor can be realized, and the integrity of the motor detection function is improved.
The vector angle of any two phases of electricity in the three-phase electricity at any moment is different by 120 degrees, and the angle difference can be called as the phase angle of two waveforms and the phase angle of two phases of electricity. The overlapping means that the phase angles between any two phases in the three-phase power do not accord with a preset difference value, if the phase angles of any two phases are less than 60 degrees, the phase angles of the two phases are determined to be overlapped, and the working state of the motor is a phase sequence phase dislocation state.
The method comprises the steps of detecting three-phase voltage of the motor before the motor runs, indicating that one phase is lacked if only two-phase voltage values are detected, and determining that the working state of the motor at the moment is the phase lack. Because the three-phase voltage is detected before the motor runs, if the motor voltage is lack of one phase, the voltage generated in the phase lack can not be caused, and the working state of the motor can be judged only by judging whether the three-phase voltage is complete or not.
The phase unbalance is that the three-phase voltage amplitude of the motor is inconsistent, and the amplitude difference exceeds a specified range. The preset voltage alarm range refers to the standard of whether the voltage value is normal or not according to the rated voltage of the motor and can be set according to national standards or empirical values. Specifically, when at least one phase of the three-phase voltage of the motor exceeds the reference voltage value by more than 10%, the working state of the motor is judged to be phase imbalance. Optionally, when the average value of the three-phase voltage of the motor exceeds the reference voltage by more than 10%, the working state of the motor is judged to be phase imbalance. Optionally, the preset voltage alarm range can be adjusted according to actual conditions, so that the detection accuracy of the relative unbalance is improved according to the actual conditions of the motor. Illustratively, the preset voltage alarm range is adjusted by generating a timer interrupt of 1ms, during which the count is accumulated. And after the capacitor in the adjusting circuit is discharged, interrupting, acquiring a value accumulated in the interruption of the timer, calculating to obtain a set range according to the value, charging the capacitor, clearing the accumulated value, and waiting for the next calculation. And the time length required by the discharge of the capacitor is adjusted by adjusting the resistance value of the adjustable resistor in the circuit. For example, the preset voltage alarm range is adjusted from the original reference voltage value of 10% to the reference voltage value of 7% according to the adjustment of the resistance value of the adjustable resistor.
The overheating of the motor means that the temperature of a motor winding is too high, and the overheating can be detected through a temperature sensor connected into the motor. The preset normal temperature range refers to a temperature range which is set according to the actual condition of the motor and represents the normal operation of the motor, and can be set according to an empirical value. Causes of motor overheating include: long-time operation of the motor, abnormal operation of the motor and the like. Specifically, the temperature sensor monitors the temperature of the motor in real time, and if the obtained temperature value exceeds a preset normal temperature range, the working state of the motor is determined to be that the motor is overheated. The preset normal temperature range can be adjusted according to the actual condition, for example, the preset voltage alarm ranges of a new motor and a motor with long service life are different.
The short circuit or open circuit of the temperature sensor means that the sensor circuit for monitoring the temperature in the motor has short circuit or open circuit, which can cause inaccurate temperature monitoring of the motor or incapability of monitoring the temperature of the motor. The state of the temperature sensor is judged by monitoring the resistance value of the temperature sensor circuit. Specifically, when the monitored resistance value is zero, the working state of the motor is determined to be the short circuit of the temperature sensor; and when the monitored resistance value is infinite, determining that the working state of the motor is open circuit.
Optionally, the motor protection device can detect the working states of the multiple motors according to a certain sequence, so that the efficiency of detecting the working states is ensured. Optionally, can detect the phase failure before the motor operation earlier, to the phase sequence dislocation after that, the phase imbalance, the phase failure in the motor operation process detects in proper order, detect motor overheat and temperature sensor short circuit or open circuit simultaneously, guarantee the efficiency that detects, carry out the circulation according to the detection order that sets up and detect, guarantee the operating condition that causes the abnormal operation of motor in time to discover, protect the motor effectively, reduce because of the motor trouble leads to equipment itself and staff's the unexpected condition to appear.
Step 204, if the time length of the motor in the working state exceeds the response time length of the working state, closing the motor; wherein the response time length is determined according to user operation.
The duration in the working state refers to the duration after the working state of the motor is detected, if the working state of the motor is detected to be open phase, the detection of the open phase is kept, and if the working state of the motor is always kept in the same state, the duration is calculated. The response time length of the working state is time set according to the working state and is used for indicating a normal time range of the motor in the same working state.
Illustratively, when the working state of the motor is open phase, phase sequence dislocation and phase unbalance, the time length exceeds 5 seconds, the motor is closed; and the response time length can be adjusted between 0.1 second and 10 seconds; and when the working state of the motor is that the motor is overheated or the time length of the short circuit or the open circuit of the temperature sensor is more than 0.5 second, the motor is turned off, and the response time length can be adjusted according to the actual condition. The adjustment principle of the response time length is the same as that of the preset voltage alarm range. The response time of each working state is set according to the user requirement, so that the detection error caused by detection error at one time or abnormal operation of the motor in a short time can be avoided, and the running efficiency of the motor is improved.
The embodiment of the invention realizes the detection of various abnormal running conditions of the motor by detecting various working states of the motor, and timely turns off the motor, thereby effectively avoiding the damage of motor equipment. And the motor faults are checked according to the detected working state, so that the working efficiency of the motor is improved. In addition, detection items and alarm range time of the motor can be set according to actual conditions, and detection efficiency and accuracy of the motor and operation efficiency of the motor are improved.
EXAMPLE III
Fig. 3 is a schematic structural diagram of a motor working state detection device in a third embodiment of the present invention, which is applicable to a situation where a working state of a motor is detected during a motor operation process, and is executed by a motor protection device, where the motor protection device is connected to the motor. As shown in fig. 3, the apparatus includes:
the reference voltage value setting module is used for setting a reference voltage value according to the rated voltage of the motor;
the minimum voltage phase acquisition module is used for monitoring three-phase voltages of the motor in the running process of the motor and acquiring a minimum voltage value and a minimum voltage phase to which the minimum voltage value belongs;
and the working state determining module is used for comparing the minimum voltage value with other two-phase voltage values and the reference voltage value respectively to determine the working state of the motor.
The embodiment of the invention sets the reference voltage value of the motor protection device based on the rated voltages of different motors, thereby realizing the support of protecting the motors with various voltage standards. And the three-phase voltage value of the motor is monitored in the running process of the motor, the working state of the motor is determined according to the comparison between the monitored value and the reference voltage value, and the accuracy of judging the phase-lacking working state of the motor in the running process of the motor is improved. The condition that the motor generates a regenerative power supply due to phase loss in the operation of the motor is detected, and the condition that the motor is overheated due to only two-phase electric input of the motor is effectively avoided.
Optionally, the working state determining module is specifically configured to:
when the minimum voltage value is lower than the reference voltage value and the difference value is larger than the threshold value, determining the minimum voltage as a regeneration power supply, wherein the working state of the motor is a phase failure; and adjusting the threshold value according to the voltage values of the other two phases.
Optionally, the reference voltage value setting module includes:
the reference voltage setting mode unit is used for taking a voltage value input by a user as the reference voltage value if the motor is in the reference voltage setting mode after being started;
and the non-reference voltage setting mode unit is used for taking a pre-stored voltage value as the reference voltage value if the motor is in a non-reference voltage setting mode after being started.
Optionally, the apparatus further includes at least one of the following modules:
the phase sequence and phase error determining module is used for determining that the working state of the motor is phase sequence and phase error if the motor is detected to have two-phase angle overlapping;
the open-phase determining module is used for determining that the working state of the motor is open-phase if the motor is detected to lack one phase in three-phase voltage before running;
the phase unbalance determination module is used for determining that the working state of the motor is phase unbalance if the voltage value of at least one phase in the three-phase voltage of the motor is detected to exceed the preset voltage alarm range of the reference voltage;
the motor overheating determining module is used for determining that the working state of the motor is motor overheating if the temperature value of the motor is detected to exceed the preset normal temperature range;
and the temperature sensor state determining module is used for determining that the working state of the motor is a short circuit or an open circuit of the temperature sensor if the resistance value of the motor temperature sensor circuit is detected to be zero or infinite.
Optionally, the apparatus further comprises:
if the time length of the motor in the working state exceeds the response time length of the working state, the motor is closed; wherein the response time length is determined according to user operation.
The motor working state detection device provided by the embodiment of the invention can execute the motor working state detection method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of executing the motor working state detection method.
Example four
Fig. 4 is a schematic structural diagram of a computer device according to a fourth embodiment of the present invention. FIG. 4 illustrates a block diagram of an exemplary computer device 12 suitable for use in implementing embodiments of the present invention. The computer device 12 shown in FIG. 4 is only one example and should not bring any limitations to the functionality or scope of use of embodiments of the present invention.
As shown in FIG. 4, computer device 12 is in the form of a general purpose computing device. The components of computer device 12 may include, but are not limited to: one or more processors or processing units 16, a system memory device 28, and a bus 18 that couples various system components including the system memory device 28 and the processing unit 16.
The system storage 28 may include computer system readable media in the form of volatile storage, such as Random Access Memory (RAM)30 and/or cache storage 32. Computer device 12 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 34 may be used to read from and write to non-removable, nonvolatile magnetic media (not shown in FIG. 4, and commonly referred to as a "hard drive"). Although not shown in FIG. 4, a magnetic disk drive for reading from and writing to a removable, nonvolatile magnetic disk (e.g., a "floppy disk") and an optical disk drive for reading from or writing to a removable, nonvolatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to bus 18 by one or more data media interfaces. Storage 28 may include at least one program product having a set (e.g., at least one) of program modules that are configured to carry out the functions of embodiments of the invention.
A program/utility 40 having a set (at least one) of program modules 42 may be stored, for example, in storage 28, such program modules 42 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which examples or some combination thereof may comprise an implementation of a network environment. Program modules 42 generally carry out the functions and/or methodologies of the described embodiments of the invention.
The processing unit 16 executes various functional applications and data processing by running programs stored in the system storage device 28, for example, to implement a motor operating state detection method provided by the embodiment of the present invention, including:
setting a reference voltage value according to the rated voltage of the motor;
monitoring three-phase voltage of the motor in the running process of the motor, and acquiring a minimum voltage value and a minimum voltage phase to which the minimum voltage value belongs;
and comparing the minimum voltage value with other two-phase voltage values and the reference voltage value respectively to determine the working state of the motor.
EXAMPLE five
The fifth embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method for detecting the operating state of a motor according to the fifth embodiment of the present invention, where the method includes:
setting a reference voltage value according to the rated voltage of the motor;
monitoring three-phase voltage of the motor in the running process of the motor, and acquiring a minimum voltage value and a minimum voltage phase to which the minimum voltage value belongs;
and comparing the minimum voltage value with other two-phase voltage values and the reference voltage value respectively to determine the working state of the motor.
Computer storage media for embodiments of the invention may employ any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A motor working state detection method is characterized by being executed by a motor protection device, wherein the motor protection device is connected with a motor, and the method comprises the following steps:
setting a reference voltage value according to the rated voltage of the motor;
monitoring three-phase voltage of the motor in the running process of the motor, and acquiring a minimum voltage value and a minimum voltage phase to which the minimum voltage value belongs;
and comparing the minimum voltage value with other two-phase voltage values and the reference voltage value respectively to determine the working state of the motor.
2. The method of claim 1, wherein comparing the minimum voltage value with other two-phase voltage values and the reference voltage to obtain an operating state of the motor comprises:
when the minimum voltage value is lower than the reference voltage value and the difference value is larger than the threshold value, determining the minimum voltage as a regeneration power supply, wherein the working state of the motor is a phase failure; and adjusting the threshold value according to the voltage values of the other two phases.
3. The method of claim 1, wherein setting a reference voltage value based on a rated voltage of the motor comprises:
if the motor is in a reference voltage setting mode after being started, taking a voltage value input by a user as the reference voltage value;
and if the motor is in a non-reference voltage setting mode after being started, taking a pre-stored voltage value as the reference voltage value.
4. The method of claim 1, wherein after setting a reference voltage value based on a rated voltage of the motor, the method further comprises at least one of:
if the motor is detected to have two-phase angle overlapping, determining that the working state of the motor is phase sequence phase error;
if the motor is detected to lack one phase in three-phase voltage before running, determining that the working state of the motor is a phase lack state;
if the voltage value of at least one phase of the three-phase voltage of the motor is detected to exceed the preset voltage alarm range of the reference voltage, determining that the working state of the motor is phase imbalance;
if the detected temperature value of the motor exceeds the preset normal temperature range, determining the working state of the motor as motor overheating;
and if the resistance value of the motor temperature sensor circuit is detected to be zero or infinite, determining that the working state of the motor is a temperature sensor short circuit or an open circuit.
5. The method of claim 1 or 4, wherein after obtaining the operating state of the electric machine, further comprising:
if the time length of the motor in the working state exceeds the response time length of the working state, the motor is closed; wherein the response time length is determined according to user operation.
6. The utility model provides a motor operating condition detection device which characterized in that, is executed by motor protection device, motor protection device connects the motor, includes:
the reference voltage value setting module is used for setting a reference voltage value according to the rated voltage of the motor;
the minimum voltage phase acquisition module is used for monitoring three-phase voltages of the motor in the running process of the motor and acquiring a minimum voltage value and a minimum voltage phase to which the minimum voltage value belongs;
and the working state determining module is used for comparing the minimum voltage value with other two-phase voltage values and the reference voltage value respectively to determine the working state of the motor.
7. The apparatus according to claim 6, wherein the operating state determining module is specifically configured to:
when the minimum voltage value is lower than the reference voltage value and the difference value is larger than the threshold value, determining the minimum voltage as a regeneration power supply, wherein the working state of the motor is a phase failure; and adjusting the threshold value according to the voltage values of the other two phases.
8. The apparatus of claim 6, wherein the reference voltage value setting module comprises:
the reference voltage setting mode unit is used for taking a voltage value input by a user as the reference voltage value if the motor is in the reference voltage setting mode after being started;
and the non-reference voltage setting mode unit is used for taking a pre-stored voltage value as the reference voltage value if the motor is in a non-reference voltage setting mode after being started.
9. A computer device, comprising:
one or more processors;
a storage device for storing one or more programs,
when executed by the one or more processors, cause the one or more processors to implement a motor operating state detection method as claimed in any one of claims 1-5.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out a method of detecting an operating state of an electric motor according to any one of claims 1 to 5.
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