CN117269755A - Method for monitoring motor state - Google Patents
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- CN117269755A CN117269755A CN202311157940.7A CN202311157940A CN117269755A CN 117269755 A CN117269755 A CN 117269755A CN 202311157940 A CN202311157940 A CN 202311157940A CN 117269755 A CN117269755 A CN 117269755A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000012360 testing method Methods 0.000 claims abstract description 81
- 238000012423 maintenance Methods 0.000 claims abstract description 71
- 230000002159 abnormal effect Effects 0.000 claims abstract description 49
- 238000001514 detection method Methods 0.000 claims abstract description 48
- 238000011156 evaluation Methods 0.000 claims abstract description 13
- 238000004458 analytical method Methods 0.000 claims abstract description 9
- 238000009413 insulation Methods 0.000 claims description 88
- 238000007789 sealing Methods 0.000 claims description 50
- 238000005259 measurement Methods 0.000 claims description 17
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- 238000011056 performance test Methods 0.000 claims description 4
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- G—PHYSICS
- 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
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Abstract
The invention provides a motor state monitoring method, which relates to the technical field of motor state monitoring and comprises the following steps: partial discharge monitoring is carried out on the motor stator; performing tightness test on a motor stator; carrying out short circuit test on a motor rotor; carrying out short circuit test on the motor; judging whether the state of the motor is abnormal or not according to the comprehensive test result; analyzing the frequency of abnormal states of the motor in the first evaluation period, and judging whether the motor needs to be replaced or not; the invention is used for solving the problems that the existing motor state monitoring technology is lack of analysis on whether motor accessories are abnormal or not and detection on motor fault frequency, so that whether the motor is normal or not and whether continuous maintenance is worth of being carried out or not is difficult to monitor when operation data are correct.
Description
Technical Field
The invention relates to the technical field of motor state monitoring, in particular to a motor state monitoring method.
Background
The motor state monitoring technology is a technology for monitoring and analyzing various parameters and data in the running process of a motor to know the working state, performance index and health condition of the motor in real time; through the monitoring to the motor state, the possible trouble or abnormal conditions of early warning can be in advance to in time take maintenance or maintenance measures, guarantee the safe operation and the increase of service life of motor.
The existing motor state monitoring technology generally performs state analysis on various parameters such as current and voltage in the motor operation process, judges whether the motor is abnormal, lacks analysis on various rated parameters configured by the motor, and lacks monitoring on unconventional parameters of motor accessories, so that the motor operation parameters are normal, but damage to the motor is larger, the service life of the motor is greatly reduced, and meanwhile, the existing motor state monitoring technology lacks detection on motor fault frequency, so that whether the motor can still be continuously used and whether maintenance cost is greater than replacement cost cannot be judged, for example, the motor state monitoring technology is disclosed in application publication No.: in the chinese patent CN115962100a, a "wind turbine generator system status monitoring system" is disclosed, this scheme only analyzes the conventional data of motor operation, lacks the analysis of whether motor accessories are normal and lacks the detection of motor failure frequency, and results in unable to judge whether the motor can still continue to use and whether the maintenance cost is greater than the replacement cost, and the existing motor status monitoring technology still has the problem that lacks the analysis of whether motor accessories are unusual and the detection of motor failure frequency, resulting in difficulty in monitoring whether the motor is normal and is worth continuing to maintain when the operation data is correct.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a motor state monitoring method which can periodically analyze important accessories of a motor so as to ensure that the service life of the motor can reach the maximum, monitor the failure frequency of the motor and timely judge whether the motor is completely damaged, thereby solving the problems that the existing motor state monitoring technology still lacks analysis on whether the motor accessories are abnormal or not and detection on the failure frequency of the motor, and is difficult to monitor whether the motor is normal or not and is worth to maintain continuously when running data is correct.
In order to achieve the above object, the present invention provides a method for monitoring a motor status, comprising the steps of:
partial discharge monitoring is carried out on the motor stator;
performing tightness test on a motor stator;
carrying out short circuit test on a motor rotor;
carrying out short circuit test on the motor;
judging whether the state of the motor is abnormal or not according to the comprehensive test result;
and analyzing the frequency of abnormal states of the motor in the first evaluation period, and judging whether the motor needs to be replaced or not.
Further, the monitoring of partial discharge of the motor stator comprises the following sub-steps:
a partial discharge detector is arranged on a stator winding of a motor stator;
monitoring whether a partial discharge phenomenon occurs in a motor stator, and if so, outputting a stator partial discharge abnormal signal; if not, outputting a stator partial discharge normal signal;
and marking the stator partial discharge abnormal signal and the stator partial discharge normal signal as a partial discharge test result.
Further, the tightness test of the motor stator comprises the following substeps:
measuring the insulation value of a motor stator, and marking the insulation value as a pre-measurement insulation value;
placing a motor stator into a sealing device;
pressing water into the sealing device through the pressure pump, and discharging gas in the sealing device;
monitoring the pressure in the sealing device, marking as sealing pressure, stopping pressurizing when the sealing pressure is equal to a first pressure threshold;
starting a timer while stopping pressurizing, marking the recorded time as a test duration, stopping the test when the test duration is equal to a first time threshold value, discharging water in the sealing device, and taking out a motor stator;
detecting the insulation value of the motor stator again, and marking the insulation value as a measured insulation value;
and analyzing the insulation value before and after measurement to judge whether the tightness of the motor stator is normal.
Further, analyzing the pre-measurement insulation value and the post-measurement insulation value comprises the following sub-steps:
calculating the absolute value of the difference value between the insulation value before measurement and the insulation value after measurement, and marking the absolute value as an insulation difference value;
comparing the insulation difference value with an insulation error threshold value, and outputting a stator sealing normal signal if the insulation difference value is smaller than or equal to the insulation error threshold value; if the insulation difference value is larger than the insulation error threshold value, outputting a stator sealing abnormal signal;
and marking the stator sealing normal signal and the stator sealing abnormal signal as a sealing performance test result.
Further, the short circuit test of the motor rotor comprises the following sub-steps:
closing the motor and disconnecting the motor power supply;
connecting the positive electrode and the negative electrode of the insulating resistance meter to two terminals of a motor rotor;
measuring an insulation resistance value of a motor rotor through an insulation resistance meter;
reading a motor equipment database, obtaining a rated range of insulation resistance values, and marking the rated range as a rated insulation resistance range;
comparing the insulation resistance value with a rated insulation resistance range, searching whether the insulation resistance value is in the rated insulation resistance range, and if so, outputting a rotor short circuit detection passing signal; if not, outputting a rotor short circuit detection failure signal;
and marking the rotor short circuit detection passing signal and the rotor short circuit detection failure signal as rotor short circuit test results.
Further, the short circuit test of the motor comprises the following substeps:
braking the motor rotor through braking equipment, and keeping the motor rotor fixed and unable to rotate;
accessing a voltage regulator to the motor, setting the output voltage of the voltage regulator to be zero, and gradually increasing the output voltage at a first boosting speed;
reading a motor equipment database to obtain rated current of a motor;
detecting the current of the motor in real time through a ammeter, and marking the current as motor current; stopping the increase of the output voltage when the motor current is equal to the rated current, recording the output voltage at the moment and marking the output voltage as a short-circuit voltage;
acquiring rated voltage of a motor, and searching a short circuit rated voltage range corresponding to the rated voltage by referring to a short circuit voltage database;
searching whether the short circuit voltage is in a short circuit rated voltage range, if so, outputting a motor short circuit detection passing signal; if not, outputting a motor short circuit detection failure signal;
and marking the motor short circuit detection passing signal and the motor short circuit detection failure signal as motor short circuit test results.
Further, the comprehensive test result judges whether the state of the motor is abnormal or not, and the method comprises the following substeps:
obtaining a partial discharge test result, a tightness test result, a rotor short circuit test result and a motor short circuit test result;
if the partial discharge test result is a stator partial discharge abnormal signal, sending stator partial discharge maintenance information to a maintenance end;
if the tightness test result is a stator sealing abnormal signal, sending stator tightness maintenance information to a maintenance end;
if the rotor short circuit test result is a rotor short circuit detection failure signal, sending rotor short circuit maintenance information to a maintenance end;
and if the motor short circuit test signal is a motor short circuit detection failure signal, sending motor short circuit maintenance information to a maintenance end.
Further, analyzing the frequency of abnormal states of the motor in the first evaluation period includes the following sub-steps:
obtaining total times of outputting a stator partial discharge abnormal signal, a stator sealing abnormal signal, a rotor short circuit detection failure signal and a motor short circuit detection failure signal in a first evaluation period, and marking the total times as state abnormal times;
comparing the state anomaly times with a first anomaly times threshold value, and outputting a motor normal signal if the state anomaly times are smaller than the first anomaly times threshold value; if the state anomaly times are greater than or equal to a first anomaly times threshold value, outputting a motor damage signal;
if the motor damage signal is output, recording a high-frequency maintenance signal; if the motor normal signal is output, recording a low-frequency maintenance signal; marking the high frequency maintenance signal and the low frequency maintenance signal as maintenance frequency signals;
and recording maintenance frequency signals, and if the maintenance frequency signals continuously recorded to the first damage maintenance times are all high-frequency maintenance signals, marking the motor as damaged.
The invention has the beneficial effects that: the invention monitors whether the motor stator is partially discharged or not and timely sends the maintenance signal when the partial discharge condition occurs in the motor stator, and has the advantages that the partial discharge phenomenon of the motor stator can be prevented from disturbing the electric signal in the motor, and the safety of the motor operation is improved;
according to the invention, the tightness test is carried out on the motor stator, so that whether the tightness of the motor stator is good or not is analyzed, and a maintenance signal is timely sent when the tightness of the motor stator is abnormal;
according to the invention, the motor rotor and the motor are subjected to short circuit test, so that whether the voltages of the motor rotor and the motor in short circuit exceed the rated threshold value or not is judged, and a maintenance signal is timely sent; the safety of the operation of the motor and the safety of a power system are improved;
the invention monitors the frequency of motor faults and analyzes the times of the faults of the motor in a first evaluation period and whether high-frequency maintenance signals continuously appear to judge whether the motor is completely damaged.
Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a flow chart of the steps of the method of the present invention;
fig. 2 is a flow chart of the steps of the motor stator tightness test of the present invention.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
Example 1
Referring to fig. 1, the present invention provides a method for monitoring a motor state, which can periodically analyze important accessories of a motor to ensure that the service life of the motor can reach a maximum, and can monitor the failure frequency of the motor to timely determine whether the motor is completely damaged, so as to solve the problem that the existing motor state monitoring technology still lacks analysis on whether the motor accessories are abnormal or not and detection on the failure frequency of the motor, which results in difficulty in monitoring whether the motor is normal or not and whether the motor is worth to maintain continuously when running data is correct.
The motor state monitoring method comprises the steps of S1, S2, S3, S4, S5 and S6.
Step S1, monitoring partial discharge of a motor stator; step S1 comprises the following sub-steps:
step S101, installing a partial discharge detector on a stator winding of a motor stator;
step S102, monitoring whether a partial discharge phenomenon occurs in a motor stator, and if so, outputting a stator partial discharge abnormal signal; if not, outputting a stator partial discharge normal signal;
step S103, marking the stator partial discharge abnormal signal and the stator partial discharge normal signal as partial discharge test results;
in the implementation, because the stator partial discharge phenomenon can generate high-frequency current, a partial discharge detector adopts a high-frequency current sensor in the prior art; and if the monitoring motor stator does not have the partial discharge phenomenon, outputting a stator partial discharge normal signal, wherein the partial discharge test result at the moment is the stator partial discharge normal signal.
Referring to fig. 2, step S2 is performed to perform a tightness test on a motor stator; step S2 comprises the following sub-steps:
step S201, measuring the insulation value of a motor stator, and marking the insulation value as a pre-measurement insulation value;
step S202, placing a motor stator into a sealing device;
step S203, pressing water into the sealing device by a pressure pump, and discharging gas in the sealing device;
step S204, monitoring the pressure in the sealing device, marking as sealing pressure, and stopping pressurizing when the sealing pressure is equal to a first pressure threshold value;
step S205, starting a timer while stopping pressurizing, marking the recorded time as a test duration, stopping the test when the test duration is equal to a first time threshold, discharging water in the sealing device, and taking out a motor stator;
step S206, detecting the insulation value of the motor stator again, and marking the insulation value as a detected insulation value;
in specific implementation, the first pressure threshold is set to be 30mpa, the first time length threshold is set to be 60s, the insulation value before measurement is measured to be 1MΩ, the sealing device adopts the existing pressure testing cylinder, the pressure pump adopts the pressure testing pump in the prior art, the sealing pressure is monitored to be 30mpa, the sealing pressure is equal to the first pressure threshold, pressurization is stopped, a timer is started, the test duration is recorded to be 60s, the test duration is equal to the first time length threshold, the test is stopped, the water in the sealing device is discharged, the motor stator is taken out, and the insulation value after measurement is measured to be 1MΩ;
step S207, analyzing the insulation value before measurement and the insulation value after measurement to judge whether the tightness of the motor stator is normal or not;
step S207 includes the following sub-steps:
step S2071, calculating the absolute value of the difference value between the insulation value before measurement and the insulation value after measurement, and marking the absolute value as the insulation difference value;
s2072, comparing the insulation difference value with an insulation error threshold value, and outputting a stator sealing normal signal if the insulation difference value is smaller than or equal to the insulation error threshold value; if the insulation difference value is larger than the insulation error threshold value, outputting a stator sealing abnormal signal;
step S2073, marking the stator sealing normal signal and the stator sealing abnormal signal as a sealing performance test result;
in specific implementation, the insulation error threshold is set to be 0.0002MΩ, the insulation difference is calculated to be 0MΩ, and the insulation difference is obtained by comparison to be less than or equal to the insulation error threshold, then a stator sealing normal signal is output, and the sealing performance test result at this time is the stator sealing normal signal.
S3, carrying out short circuit test on the motor rotor; step S3 comprises the following sub-steps:
step S301, the motor is turned off, and the motor power supply is disconnected;
step S302, connecting the anode and the cathode of the insulation resistance meter to two terminals of a motor rotor;
step S303, measuring the insulation resistance value of the motor rotor through an insulation resistance meter;
step S304, a motor equipment database is read, a rated range of insulation resistance values is obtained, and the rated insulation resistance range is marked;
step S305, comparing the insulation resistance value with a rated insulation resistance range, searching whether the insulation resistance value is in the rated insulation resistance range, and if so, outputting a rotor short circuit detection passing signal; if not, outputting a rotor short circuit detection failure signal;
step S306, marking the rotor short circuit detection passing signal and the rotor short circuit detection failure signal as rotor short circuit test results;
in specific implementation, the insulating resistance meter in the prior art is adopted, and the motor equipment database is a database for recording rated values of various parameters of the motor and is a preset database; and (3) measuring to obtain an insulation resistance value of 0.7MΩ, obtaining a rated insulation resistance range of [0.5MΩ,1.5MΩ ], comparing and searching to obtain an insulation resistance value within the rated insulation resistance range, and outputting a rotor short-circuit detection passing signal, wherein the rotor short-circuit test result is the rotor short-circuit detection passing signal.
S4, carrying out short circuit test on the motor; step S4 comprises the following sub-steps:
step S401, braking a motor rotor through braking equipment, and keeping the motor rotor fixed and unable to rotate;
step S402, a voltage regulator is connected to the motor, the output voltage of the voltage regulator is set to be zero, and the output voltage is gradually increased at a first boosting speed;
step S403, reading a motor equipment database to obtain rated current of a motor;
step S404, detecting the current of the motor in real time through a ammeter, and marking the current as the motor current; stopping the increase of the output voltage when the motor current is equal to the rated current, recording the output voltage at the moment and marking the output voltage as a short-circuit voltage;
step S405, obtaining rated voltage of a motor, and searching a short circuit rated voltage range corresponding to the rated voltage by comparing with a short circuit voltage database;
step S406, whether the short circuit voltage is in the short circuit rated voltage range is searched, if so, a motor short circuit detection passing signal is output; if not, outputting a motor short circuit detection failure signal;
step S407, marking the motor short-circuit detection passing signal and the motor short-circuit detection failure signal as motor short-circuit test results;
in specific implementation, the first boosting speed is set to be 1V/s, the existing braking equipment is adopted by the braking equipment, the existing three-phase voltage regulator is adopted by the voltage regulator, rated current 1120A is obtained, motor current 875A is detected, rated current is not reached, boosting is continued, boosting is stopped when the motor current reaches the rated current, short-circuit voltage is detected to be 82V, a motor equipment database is read, the short-circuit rated voltage range is obtained to be [75V,90V ], the short-circuit voltage is obtained to be within the short-circuit rated voltage range through searching and comparison, a motor short-circuit detection passing signal is output, and a motor short-circuit test result at the moment is the motor short-circuit detection passing signal.
S5, judging whether the state of the motor is abnormal or not according to the comprehensive test result; step S5 comprises the following sub-steps:
step S501, obtaining a partial discharge test result, a tightness test result, a rotor short circuit test result and a motor short circuit test result;
step S502, if the partial discharge test result is a stator partial discharge abnormal signal, sending stator partial discharge maintenance information to a maintenance end;
step S503, if the tightness test result is a stator sealing abnormal signal, sending stator tightness maintenance information to a maintenance end;
step S504, if the rotor short circuit test result is a rotor short circuit detection failure signal, the rotor short circuit maintenance information is sent to a maintenance end;
step S505, if the motor short circuit test signal is a motor short circuit detection failure signal, sending motor short circuit maintenance information to a maintenance end;
in the specific implementation, the partial discharge test result is obtained as a stator partial discharge normal signal, the tightness test result is a stator sealing normal signal, the rotor short circuit test result is a rotor short circuit detection passing signal, and the motor short circuit test result is a motor short circuit detection passing signal; the results of steps S502 to S505 are not detected, and thus there is no need to send maintenance information to the maintenance end.
S6, analyzing the frequency of abnormal states of the motor in the first evaluation period, and judging whether the motor needs to be replaced or not; in practical application, the maintenance frequency of the motor can directly reflect the degree of quality of the motor, and too frequent maintenance of the motor can lead to the problems that the maintenance cost is far beyond expectations and the maintenance of the motor affects normal operation, so that the maintenance frequency of the motor is analyzed, and when the motor is maintained at high frequency, the motor can be timely replaced to ensure that the motor has higher safety and the motor is stable in operation; step S6 comprises the following sub-steps:
step S601, obtaining total times of outputting a stator partial discharge abnormal signal, a stator sealing abnormal signal, a rotor short circuit detection failure signal and a motor short circuit detection failure signal in a first evaluation period, and marking the total times as state abnormal times;
step S602, comparing the state anomaly times with a first anomaly times threshold value, and outputting a motor normal signal if the state anomaly times are smaller than the first anomaly times threshold value; if the state anomaly times are greater than or equal to a first anomaly times threshold value, outputting a motor damage signal;
step S603, if the motor damage signal is output, recording a high-frequency maintenance signal; if the motor normal signal is output, recording a low-frequency maintenance signal; marking the high frequency maintenance signal and the low frequency maintenance signal as maintenance frequency signals;
step S604, recording maintenance frequency signals, and if the maintenance frequency signals continuously recorded to the first damage maintenance times are all high-frequency maintenance signals, marking the motor as damaged;
in the specific implementation, the first evaluation period is set to 60 days, the first abnormal frequency threshold is set to 5, the first damage maintenance frequency is set to 3, the acquired state abnormal frequency is 3, the state abnormal frequency is smaller than the first abnormal frequency threshold through comparison, a motor normal signal is output, and a low-frequency maintenance signal is recorded; and (3) entering the analysis of the next first evaluation period, and marking the motor as damaged when the high-frequency maintenance signals are recorded in the first evaluation period of the continuous first damage maintenance times, wherein the motor is replaced.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media having computer-usable program code embodied therein. The storage medium may be implemented by any type or combination of volatile or nonvolatile Memory devices, such as static random access Memory (Static Random Access Memory, SRAM), electrically erasable Programmable Read-Only Memory (Electrically Erasable Programmable Read-Only Memory, EEPROM), erasable Programmable Read-Only Memory (Erasable Programmable Red Only Memory, EPROM), programmable Read-Only Memory (PROM), read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk, or optical disk. These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
The above examples are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, but it should be understood by those skilled in the art that the present invention is not limited thereto, and that the present invention is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A method for monitoring the condition of an electric machine, comprising the steps of:
partial discharge monitoring is carried out on the motor stator;
performing tightness test on a motor stator;
carrying out short circuit test on a motor rotor;
carrying out short circuit test on the motor;
judging whether the state of the motor is abnormal or not according to the comprehensive test result;
and analyzing the frequency of abnormal states of the motor in the first evaluation period, and judging whether the motor needs to be replaced or not.
2. A method of monitoring the condition of an electric machine according to claim 1, characterized in that the monitoring of the partial discharge of the stator of the electric machine comprises the sub-steps of:
a partial discharge detector is arranged on a stator winding of a motor stator;
monitoring whether a partial discharge phenomenon occurs in a motor stator, and if so, outputting a stator partial discharge abnormal signal; if not, outputting a stator partial discharge normal signal;
and marking the stator partial discharge abnormal signal and the stator partial discharge normal signal as a partial discharge test result.
3. A method of monitoring the condition of an electric machine according to claim 2, characterized in that the tightness test of the stator of the electric machine comprises the sub-steps of:
measuring the insulation value of a motor stator, and marking the insulation value as a pre-measurement insulation value;
placing a motor stator into a sealing device;
pressing water into the sealing device through the pressure pump, and discharging gas in the sealing device;
monitoring the pressure in the sealing device, marking as sealing pressure, stopping pressurizing when the sealing pressure is equal to a first pressure threshold;
starting a timer while stopping pressurizing, marking the recorded time as a test duration, stopping the test when the test duration is equal to a first time threshold value, discharging water in the sealing device, and taking out a motor stator;
detecting the insulation value of the motor stator again, and marking the insulation value as a measured insulation value;
and analyzing the insulation value before and after measurement to judge whether the tightness of the motor stator is normal.
4. A method of monitoring the condition of an electrical machine according to claim 3, wherein the analysis of the pre-measured insulation value and the post-measured insulation value comprises the sub-steps of:
calculating the absolute value of the difference value between the insulation value before measurement and the insulation value after measurement, and marking the absolute value as an insulation difference value;
comparing the insulation difference value with an insulation error threshold value, and outputting a stator sealing normal signal if the insulation difference value is smaller than or equal to the insulation error threshold value; if the insulation difference value is larger than the insulation error threshold value, outputting a stator sealing abnormal signal;
and marking the stator sealing normal signal and the stator sealing abnormal signal as a sealing performance test result.
5. A method of monitoring the condition of an electric machine according to claim 4, characterized in that the short-circuit testing of the rotor of the electric machine comprises the sub-steps of:
closing the motor and disconnecting the motor power supply;
connecting the positive electrode and the negative electrode of the insulating resistance meter to two terminals of a motor rotor;
measuring an insulation resistance value of a motor rotor through an insulation resistance meter;
reading a motor equipment database, obtaining a rated range of insulation resistance values, and marking the rated range as a rated insulation resistance range;
comparing the insulation resistance value with a rated insulation resistance range, searching whether the insulation resistance value is in the rated insulation resistance range, and if so, outputting a rotor short circuit detection passing signal; if not, outputting a rotor short circuit detection failure signal;
and marking the rotor short circuit detection passing signal and the rotor short circuit detection failure signal as rotor short circuit test results.
6. A method of monitoring the condition of an electric machine according to claim 5, characterized in that the short-circuit testing of the electric machine comprises the sub-steps of:
braking the motor rotor through braking equipment, and keeping the motor rotor fixed and unable to rotate;
accessing a voltage regulator to the motor, setting the output voltage of the voltage regulator to be zero, and gradually increasing the output voltage at a first boosting speed;
reading a motor equipment database to obtain rated current of a motor;
detecting the current of the motor in real time through a ammeter, and marking the current as motor current; stopping the increase of the output voltage when the motor current is equal to the rated current, recording the output voltage at the moment and marking the output voltage as a short-circuit voltage;
acquiring rated voltage of a motor, and searching a short circuit rated voltage range corresponding to the rated voltage by referring to a short circuit voltage database;
searching whether the short circuit voltage is in a short circuit rated voltage range, if so, outputting a motor short circuit detection passing signal; if not, outputting a motor short circuit detection failure signal;
and marking the motor short circuit detection passing signal and the motor short circuit detection failure signal as motor short circuit test results.
7. The method of claim 6, wherein the step of determining whether the motor status is abnormal based on the integrated test result comprises the steps of:
obtaining a partial discharge test result, a tightness test result, a rotor short circuit test result and a motor short circuit test result;
if the partial discharge test result is a stator partial discharge abnormal signal, sending stator partial discharge maintenance information to a maintenance end;
if the tightness test result is a stator sealing abnormal signal, sending stator tightness maintenance information to a maintenance end;
if the rotor short circuit test result is a rotor short circuit detection failure signal, sending rotor short circuit maintenance information to a maintenance end;
and if the motor short circuit test signal is a motor short circuit detection failure signal, sending motor short circuit maintenance information to a maintenance end.
8. The method of claim 7, wherein analyzing the frequency of abnormal motor conditions during the first evaluation period comprises the sub-steps of:
obtaining total times of outputting a stator partial discharge abnormal signal, a stator sealing abnormal signal, a rotor short circuit detection failure signal and a motor short circuit detection failure signal in a first evaluation period, and marking the total times as state abnormal times;
comparing the state anomaly times with a first anomaly times threshold value, and outputting a motor normal signal if the state anomaly times are smaller than the first anomaly times threshold value; if the state anomaly times are greater than or equal to a first anomaly times threshold value, outputting a motor damage signal;
if the motor damage signal is output, recording a high-frequency maintenance signal; if the motor normal signal is output, recording a low-frequency maintenance signal; marking the high frequency maintenance signal and the low frequency maintenance signal as maintenance frequency signals;
and recording maintenance frequency signals, and if the maintenance frequency signals continuously recorded to the first damage maintenance times are all high-frequency maintenance signals, marking the motor as damaged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311157940.7A CN117269755A (en) | 2023-09-08 | 2023-09-08 | Method for monitoring motor state |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311157940.7A CN117269755A (en) | 2023-09-08 | 2023-09-08 | Method for monitoring motor state |
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| CN117269755A true CN117269755A (en) | 2023-12-22 |
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| CN202311157940.7A Pending CN117269755A (en) | 2023-09-08 | 2023-09-08 | Method for monitoring motor state |
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| CN (1) | CN117269755A (en) |
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