A method and device for monitoring and analyzing motor stator slot wedges

Abstract

The present invention discloses a method and device for monitoring and analyzing a motor stator slot wedge. The method comprises acquiring sensor data and status data of the motor; wherein the sensor data comprises vibration data of the motor stator slot wedge and a key phase signal of the motor; determining the fastening state of the stator slot wedge according to the sensor data and the status data, wherein the fastening state comprises at least one of vibration condition, health degree and residual looseness; when the stator slot wedge is determined to be abnormal according to the fastening state, an alarm message is issued. The technical solution of the embodiment of the present invention realizes real-time monitoring and analysis of the state of the stator slot wedge, and achieves the effect of fast and accurate testing of the stator slot wedge.

Description

Technical Field

[0001] The present invention relates to the field of motor technology, and in particular to a motor stator slot wedge monitoring and analysis method and device. Background Art

[0002] Electric motors are often used as drivers of various important auxiliary machines in power stations. The straight sections of the motor stator windings are usually fastened in the stator core slots using slot wedges and spacers.

[0003] During the operation of the motor, the stator slot wedges will be subjected to various alternating electromagnetic forces from some stator bars in the core slots and external forces of thermal expansion caused by variable loads. The stator slot wedges are prone to loosening or moving, which will affect the tightness of the stator bars in the slots, causing mechanical wear on the surface of the stator bars and discharge in the slots. Under the action of electrical corrosion, the main insulation of the motor stator is destroyed, accelerating the degradation of the main insulation and even causing motor operation accidents, thereby affecting the normal operation of important machines and even causing machine shutdowns, seriously threatening the safe and stable operation of power plants.

[0004] At present, when testing the stator slot wedge of a motor, the motor is shut down and the rotor is pulled out, and the tightness of the stator slot wedge is detected by manual tapping and listening or electronic tapping displacement analysis. At this time, the motor is in a cold state, and the tightness of the stator slot wedge is greatly different from the hot operation process of the motor. It is also impossible to simulate the dynamic vibration of the stator slot wedge under the electromagnetic load of the wire rod in the hot state, and it is impossible to accurately test the vibration of the stator slot wedge. In addition, this type of method can only be performed during shutdown, and a repair plan is formulated after the problem is found, and it is impossible to quickly test the looseness of the stator slot wedge. Summary of the invention

[0005] The present invention provides a motor stator slot wedge monitoring and analysis method and device, so as to realize rapid and accurate testing of the vibration condition of the motor stator slot wedge.

[0006] According to one aspect of the present invention, a motor stator slot wedge monitoring and analysis method is provided, and the motor stator slot wedge monitoring and analysis method comprises:

[0007] Acquire sensor data and state data of the motor; wherein the sensor data includes vibration data of the stator slot wedge of the motor and key phase signal of the motor;

[0008] Determining a tightening state of the stator slot wedge according to the sensing data and the state data, wherein the tightening state includes at least one of a vibration condition, a health degree, and a residual looseness;

[0009] When it is determined according to the tightening state that the stator slot wedge is abnormal, an alarm message is issued.

[0010] Optionally, obtain sensor data of the motor, including:

[0011] The vibration data of multiple points on at least one stator slot wedge in each phase band of the motor are obtained, and the key phase signal of the motor is obtained.

[0012] Optionally, determining the fastening state of the stator slot wedge according to the sensor data and the state data includes at least one of the following:

[0013] Determining a vibration condition of the stator slot wedge according to the sensor data and the state data;

[0014] determining the health of the stator wedge according to the sensor data and the status data;

[0015] The remaining looseness of the stator slot wedge is determined based on the sensor data and the status data.

[0016] Optionally, determining the vibration condition of the stator slot wedge according to the sensor data and the state data includes:

[0017] Determine the current power of the motor according to the state data, and determine the current frequency of the motor according to the key phase signal;

[0018] Determining a current vibration value of the stator slot wedge according to vibration data of a plurality of points on at least one stator slot wedge in each phase band of the motor;

[0019] When the current vibration value is greater than a preset vibration value corresponding to the current power and the current frequency, determining that the vibration of the stator slot wedge is abnormal;

[0020] When it is determined according to the fastening state that the stator slot wedge is abnormal, an alarm message is issued, including:

[0021] When the vibration of the stator slot wedge is abnormal, it is determined that the stator slot wedge is abnormal and an alarm message is issued.

[0022] Optionally, determining the health of the stator wedge according to the sensor data and the status data includes:

[0023] Determine the maximum vibration value and the average vibration value of each stator slot wedge according to the vibration data of multiple points on at least one stator slot wedge in each phase band of the motor;

[0024] When it is determined according to the state data that the current power of the motor is unchanged, when the difference between the maximum vibration value and the average vibration value is less than a first preset value, and when the maximum vibration value is less than a second preset value, it is determined that the health of the stator wedge is in a normal state;

[0025] When, as the motor running time changes, the maximum vibration value is greater than the second preset value, the change rate of the maximum vibration value is greater than the third preset value, and the change rate of the average vibration value is less than the fourth preset value, it is determined that the health of the stator slot wedge is in a state of needing attention;

[0026] When the rate of change of the maximum vibration value is less than a fifth preset value and the rate of change of the average vibration value is greater than a sixth preset value as the motor running time changes, it is determined that the health of the stator slot wedge is in an abnormal state;

[0027] As the motor running time changes, the change rate of the maximum vibration value is less than the seventh preset value, the change rate of the average vibration value is greater than the eighth preset value, and the difference between the average vibration value and the maximum vibration value is less than the ninth preset value, and it is determined that the health of the stator slot wedge is in a serious abnormal state;

[0028] When it is determined according to the fastening state that the stator slot wedge is abnormal, an alarm message is issued, including:

[0029] When the health of the stator slot wedge is in a state of needing attention, an abnormal state or a serious abnormal state, an alarm message is issued.

[0030] Optionally, determining the health of the stator wedge according to the sensor data and the status data includes:

[0031] Determine the through-frequency vibration value of each stator slot wedge according to the vibration data of multiple points on at least one stator slot wedge in each phase band of the motor; wherein the through-frequency vibration value is the vector sum of the vibration amplitudes of all vibration data;

[0032] Determine the main frequency vibration component of the stator slot wedge according to the state data and the vibration data;

[0033] When the through-frequency vibration value is less than a tenth preset value, and the proportion of the main frequency vibration component in all frequency components is greater than an eleventh preset value, it is determined that the health of the stator slot wedge is in a normal state;

[0034] When the rate of change of the through-frequency vibration value is greater than zero and the rate of change of the proportion of the main frequency vibration component in all frequency components is less than zero as the motor runs for a certain period of time, it is determined that the health of the stator slot wedge is in a state of needing attention;

[0035] When the through-frequency vibration value is greater than a twelfth preset value, and the proportion of the main frequency vibration component in all frequency components is less than a thirteenth preset value, it is determined that the health of the stator slot wedge is in an abnormal state;

[0036] When it is determined according to the fastening state that the stator slot wedge is abnormal, an alarm message is issued, including:

[0037] When the health of the stator wedge is in a state of concern or an abnormal state, an alarm message is issued.

[0038] Optionally, determining the health of the stator wedge according to the sensor data and the status data includes:

[0039] Determining an average vibration value of each stator slot wedge according to vibration data of a plurality of points on at least one stator slot wedge in each phase band of the motor;

[0040] When it is determined according to the state data that the power of the motor is unchanged, the rate of change of the average vibration value of the stator slot wedge is greater than a fourteenth preset value, and when it is determined according to the state data that the rate of change of the temperature of the motor is greater than a fifteenth preset value, it is determined that the health of the stator slot wedge is in an abnormal state;

[0041] When it is determined according to the fastening state that the stator slot wedge is abnormal, an alarm message is issued, including:

[0042] When the health of the stator slot wedge is in an abnormal state, an alarm message is issued.

[0043] Optionally, determining the remaining looseness of the stator slot wedge according to the sensor data and the state data includes:

[0044] Establishing a corresponding relationship between the looseness amount according to the vibration data, stator parameters and looseness amount of the stator slot wedge of the motor of the same model as the motor;

[0045] Determining the remaining looseness of the stator slot wedge according to the current vibration data of the stator slot wedge, the current stator parameter in the state data and the corresponding relationship;

[0046] When it is determined according to the fastening state that the stator slot wedge is abnormal, an alarm message is issued, including:

[0047] When the remaining looseness of the stator slot wedge is less than the preset looseness, an alarm message is issued.

[0048] According to another aspect of the present invention, a motor stator slot wedge monitoring and analysis device is provided, and the motor stator slot wedge monitoring and analysis device comprises: a sensor module and a control module;

[0049] The sensing module is connected to the control module, and the sensing module is used to collect sensing data and status data of the motor; the control module is used to obtain the sensing data and status data of the motor; the fastening state of the stator slot wedge is determined according to the sensing data and the status data, wherein the fastening state includes at least one of vibration condition, health degree and residual looseness; when the stator slot wedge is determined to be abnormal according to the fastening state, an alarm message is issued; wherein the sensing data includes vibration data of the stator slot wedge of the motor and a key phase signal of the motor.

[0050] Optionally, the sensing module includes a capacitive vibration sensor and an eddy current sensor;

[0051] The capacitive vibration sensor is arranged on the stator slot wedge in each phase belt, and at least one capacitive vibration sensor is arranged in each phase belt, and the capacitive vibration sensor is used to collect vibration data of multiple points of the stator slot wedge;

[0052] The eddy current sensor is used to collect the key phase signal of the motor.

[0053] The technical solution of the embodiment of the present invention can determine the fastening state of the stator slot wedge by acquiring the sensor data and state data of the motor. When determining whether the stator slot wedge is abnormal according to the fastening state, it can be judged according to at least one of the vibration condition, health degree and residual looseness. When the vibration of the stator slot wedge is determined to be abnormal according to the vibration data, the key phase signal and the state data, it indicates that the vibration of the stator slot wedge is large, the stator slot wedge is loose, and the fastening state of the stator slot wedge is abnormal, so the stator slot wedge is determined to be abnormal.

[0054] The health of the stator slot wedge can also be determined based on the sensor data and the status data. When the health is abnormal, it indicates that the stator slot wedge is loose and the fastening state of the stator slot wedge is abnormal, thereby determining that the stator slot wedge is abnormal.

[0055] The remaining looseness of the stator slot wedge can also be determined based on the sensor data and the status data. When the remaining looseness of the stator slot wedge is too small, it indicates that the stator slot wedge is too loose and the fastening state of the stator slot wedge is abnormal, thereby determining that the stator slot wedge is abnormal. When the stator slot wedge is judged to be abnormal, the control module will issue an alarm message to promptly remind the staff to inspect the stator slot wedge. Therefore, by collecting the vibration data of the stator slot wedge in real time, it is possible to judge whether the stator slot wedge is abnormal in real time, thereby achieving the effect of quickly testing the stator slot wedge; and, in combination with the key phase signal and status data of the motor, the running state of the motor can be determined, and the stator slot wedge can be tested when the motor is running normally to determine the fastening state of the stator slot wedge, so that the stator slot wedge can be tested more accurately; the frequency of the motor can be determined based on the key phase signal, and the power of the motor can be determined based on the status data. The vibration changes of the stator slot wedge can be observed at the same frequency and the same power, so that the stator slot wedge can be tested more accurately. The technical solution of the embodiment of the present invention solves the problem that the state of the stator slot wedge cannot be detected quickly and accurately when the motor is stopped, and realizes real-time monitoring and analysis of the state of the stator slot wedge, achieving the effect of quickly and accurately testing the stator slot wedge.

[0056] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0058] Figure 1 is a flow chart of a motor stator slot wedge monitoring and analysis method provided by an embodiment of the present invention;

[0059] Figure 2 is a flow chart of another motor stator slot wedge monitoring and analysis method provided by an embodiment of the present invention;

[0060] Figure 3 is a flow chart of another motor stator slot wedge monitoring and analysis method provided by an embodiment of the present invention;

[0061] Figure 4 is a schematic diagram of the vibration analysis results of the stator slot wedge provided in an embodiment of the present invention;

[0062] Figure 5 is a flow chart of another motor stator slot wedge monitoring and analysis method provided by an embodiment of the present invention;

[0063] Figure 6 is a flow chart of another motor stator slot wedge monitoring and analysis method provided by an embodiment of the present invention;

[0064] Figure 7 is a flow chart of another motor stator slot wedge monitoring and analysis method provided by an embodiment of the present invention;

[0065] Figure 8 It is a structural schematic diagram of a motor stator slot wedge monitoring and analysis device provided by an embodiment of the present invention;

[0066] Fig. 9 It is a structural schematic diagram of another motor stator slot wedge monitoring and analysis device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0067] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0068] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the term "comprising" and any variation thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0069] Figure 1 FIG. 1 is a flow chart of a motor stator slot wedge monitoring and analysis method provided by an embodiment of the present invention. Figure 1 As shown, the method includes:

[0070] S110, acquiring sensor data and state data of the motor; wherein the sensor data includes vibration data of the stator slot wedge of the motor and key phase signals of the motor.

[0071] Specifically, the sensor data and status data of the motor can be collected through sensors, for example, the vibration data of the stator slot wedge of the motor can be collected through a capacitive vibration sensor, and the key phase signal of the motor can be collected through an eddy current sensor. The control module can obtain the sensor data and status data of the motor from the sensor.

[0072] Exemplarily, the motor is, for example, a driving machine of an auxiliary machine of a power plant, that is, a machine that provides assistance for the generator to generate electricity. The motor can, for example, drive the fan system and the water pump system in the heat dissipation system of the generator. The status data of the motor includes, for example, the actual power of the generator set, the total fuel amount of the boiler, the main steam flow, the total air volume and other overall data, as well as the flue gas flow, wind pressure, wind temperature, damper opening, etc. of the fan system; the total flow and pressure of the water pump system, as well as the motor stator current, stator current frequency, stator voltage, stator winding temperature, cold air temperature, hot air temperature and other data. Based on the status data of the motor, it can be judged whether the running state of the motor is normal. If the running state of the motor is normal, the vibration data of the stator slot wedge of the motor is analyzed, so that the state of the stator slot wedge can be analyzed more accurately, thereby judging the degree of looseness of the stator slot wedge.

[0073] The control module is, for example, a master control system of a power station, or may be other controllers, which is not limited in this embodiment.

[0074] S120. Determine a tightening state of the stator slot wedge according to the sensing data and the state data, wherein the tightening state includes at least one of a vibration condition, a health degree, and a residual looseness.

[0075] Specifically, the fastening state of the stator slot wedge is determined according to the sensing data and the state data, and it can be determined whether the stator slot wedge is loose, thereby judging whether the stator slot wedge is abnormal. When the fastening state is abnormal, it indicates that the stator slot wedge is loose, and it can be determined that the stator slot wedge is abnormal. The vibration of the stator slot wedge can be determined according to the sensing data and the state data. When the vibration is abnormal, it indicates that the stator slot wedge is relatively loose and the fastening state of the stator slot wedge is abnormal, thereby determining that the stator slot wedge is abnormal. The health of the stator slot wedge can also be determined according to the sensing data and the state data. When the health is abnormal, it indicates that the stator slot wedge is relatively loose and the fastening state of the stator slot wedge is abnormal, thereby determining that the stator slot wedge is abnormal. The remaining looseness of the stator slot wedge can also be determined according to the sensing data and the state data. When the remaining looseness of the stator slot wedge is too small, it indicates that the stator slot wedge is too loose and the fastening state of the stator slot wedge is abnormal, thereby determining that the stator slot wedge is abnormal.

[0076] S130. When it is determined that the stator slot wedge is abnormal according to the tightening state, an alarm message is issued.

[0077] Specifically, when determining whether the stator slot wedge is abnormal according to the fastening state, the judgment can be made according to at least one of the vibration condition, health and residual looseness. When the vibration of the stator slot wedge is determined to be abnormal according to the vibration data, the key phase signal and the state data, it indicates that the vibration of the stator slot wedge is large, the stator slot wedge is loose, and the fastening state of the stator slot wedge is abnormal, thereby determining that the stator slot wedge is abnormal. The health of the stator slot wedge can also be determined according to the sensor data and the state data. When the health is abnormal, it indicates that the stator slot wedge is loose and the fastening state of the stator slot wedge is abnormal, thereby determining that the stator slot wedge is abnormal. The residual looseness of the stator slot wedge can also be determined according to the sensor data and the state data. When the residual looseness of the stator slot wedge is too small, it indicates that the stator slot wedge is too loose and the fastening state of the stator slot wedge is abnormal, thereby determining that the stator slot wedge is abnormal. When the stator slot wedge is determined to be abnormal, the control module will issue an alarm message to promptly remind the staff to repair the stator slot wedge. Therefore, by collecting the vibration data of the stator slot wedge in real time, it is possible to determine in real time whether the stator slot wedge is abnormal, thereby realizing real-time monitoring and analysis of the state of the stator slot wedge, and achieving the effect of quickly testing the stator slot wedge; and, in combination with the key phase signal and state data of the motor, the operating state of the motor can be determined, and the stator slot wedge can be tested when the motor is operating normally to determine the fastening state of the stator slot wedge, so that the stator slot wedge can be tested more accurately; the frequency of the motor can be determined according to the key phase signal, and the power of the motor can be determined according to the state data. At the same frequency and the same power, the vibration changes of the stator slot wedge can be observed, so that the stator slot wedge can be tested more accurately.

[0078] In addition, when the vibration is severe, or the health is in a state that requires attention, or the stator slot wedge is slightly loose, an alarm message is issued, which can remind the staff to inspect before the stator slot wedge is completely loose. The looseness of the stator slot wedge during motor operation can be predicted in advance, thereby avoiding motor operation accidents caused by complete loosening of the stator slot wedge.

[0079] The technical solution of this embodiment can determine the fastening state of the stator slot wedge by acquiring the sensor data and state data of the motor. When determining whether the stator slot wedge is abnormal according to the fastening state, it can be judged according to at least one of the vibration condition, health and residual looseness. When the vibration of the stator slot wedge is determined to be abnormal according to the vibration data, key phase signal and state data, it indicates that the vibration of the stator slot wedge is large, the stator slot wedge is loose, and the fastening state of the stator slot wedge is abnormal, thereby determining that the stator slot wedge is abnormal. The health of the stator slot wedge can also be determined according to the sensor data and state data. When the health is abnormal, it indicates that the stator slot wedge is loose and the fastening state of the stator slot wedge is abnormal, thereby determining that the stator slot wedge is abnormal. The residual looseness of the stator slot wedge can also be determined according to the sensor data and state data. When the residual looseness of the stator slot wedge is too small, it indicates that the stator slot wedge is too loose and the fastening state of the stator slot wedge is abnormal, thereby determining that the stator slot wedge is abnormal. When it is determined that the stator slot wedge is abnormal, the control module will issue an alarm message to promptly remind the staff to inspect the stator slot wedge. Therefore, by collecting the vibration data of the stator slot wedge in real time, it is possible to determine in real time whether the stator slot wedge is abnormal, thereby achieving the effect of quickly testing the stator slot wedge; and, in combination with the key phase signal and status data of the motor, the operating state of the motor can be determined, and the stator slot wedge can be tested when the motor is running normally to determine the fastening state of the stator slot wedge, so that the stator slot wedge can be tested more accurately; the frequency of the motor can be determined according to the key phase signal, and the power of the motor can be determined according to the status data. The vibration changes of the stator slot wedge can be observed at the same frequency and the same power, so that the stator slot wedge can be tested more accurately. The technical solution of this embodiment solves the problem that the state of the stator slot wedge cannot be quickly and accurately detected when the stator slot wedge is detected after the motor stops running, and realizes real-time monitoring and analysis of the state of the stator slot wedge, thereby achieving the effect of quickly and accurately testing the stator slot wedge. Furthermore, the technical solution of this embodiment does not require the motor to be shut down for detection, and can quickly and accurately detect the state of the stator slot wedge during the operation of the motor. When the stator slot wedge is abnormal, the motor can be shut down for inspection in time to avoid damage to the motor or other machines.

[0080] On the basis of the above technical solution, optionally, S120 determines the tightening state of the stator slot wedge according to the sensor data and the status data, including at least one of the following: determining the vibration condition of the stator slot wedge according to the sensor data and the status data; determining the health of the stator slot wedge according to the sensor data and the status data; determining the remaining looseness of the stator slot wedge according to the sensor data and the status data.

[0081] Exemplarily, when it is determined based on the status data that the motor is operating normally, the sensor data includes the vibration data of the stator slot wedge and the key phase signal of the motor. The current frequency of the motor can be determined through the key phase signal. By comparing the vibration data of the stator slot wedge corresponding to the current frequency with the preset vibration data corresponding to the current frequency, it can be determined whether the vibration of the stator slot wedge is abnormal. Therefore, by collecting the vibration data of the stator slot wedge in real time, it is possible to determine in real time whether the vibration of the stator slot wedge is abnormal, thereby achieving the effect of quickly testing the stator slot wedge. Moreover, by combining the key phase signal and the status data of the motor, the vibration condition of the stator slot wedge can be determined, so that the stator slot wedge can be tested more accurately.

[0082] When the normal operation of the motor is determined according to the status data, the health of the stator slot wedge can be determined according to the vibration data of the stator slot wedge, for example, whether the health of the stator slot wedge is normal, abnormal, or seriously abnormal. Therefore, the health of the stator slot wedge can be determined in real time by collecting the vibration data of the stator slot wedge in real time, thereby determining in real time whether the looseness of the stator slot wedge is abnormal, thereby achieving the effect of quickly testing the stator slot wedge; and, by combining the key phase signal and status data of the motor to determine the health of the stator slot wedge, the stator slot wedge can be tested more accurately.

[0083] When it is determined according to the status data that the motor is operating normally, the current frequency of the motor can be determined according to the key phase signal, the current stator parameters in the motor can be determined according to the status data, and the remaining looseness of the stator slot wedge can be determined according to the current frequency, the current stator parameters and the current vibration data; the looseness of the stator slot wedge can be judged according to the remaining looseness; the looseness of the stator slot wedge can be judged in real time by collecting the vibration data of the stator slot wedge in real time, thereby achieving the effect of quickly testing the stator slot wedge; and, the looseness of the stator slot wedge can be judged in combination with the key phase signal and the status data of the motor, so that the stator slot wedge can be tested more accurately.

[0084] Figure 2 is a flowchart of another motor stator slot wedge monitoring and analysis method provided by an embodiment of the present invention. Optionally, refer to Figure 2 , the motor stator slot wedge monitoring and analysis methods include:

[0085] S210, obtaining vibration data of multiple points on at least one stator slot wedge in each phase band of the motor, obtaining a key phase signal of the motor, and obtaining state data of the motor.

[0086] Specifically, if the motor is a three-phase motor, the motor includes three phase belts, at least one vibration sensor is arranged in each phase belt of the motor, and the vibration sensor is arranged on the stator slot wedge. The vibration sensor is, for example, a thin-film capacitor vibration sensor, which can collect vibration data of multiple points on the stator slot wedge; the control module obtains vibration data of multiple points on at least one stator slot wedge in each phase belt of the motor from the vibration sensor, and can detect multiple parts of the stator slot wedge, thereby improving the accuracy of the stator slot wedge test. In addition, the control module can obtain the key phase signal and state data of the motor, and comprehensively analyze the vibration data, key phase signal and state data, so as to test the stator slot wedge of the normally operating motor, and can observe the vibration change of the stator slot wedge according to the vibration data when the operating power of the motor remains unchanged, so as to more accurately analyze the state of the stator slot wedge and improve the accuracy of the stator slot wedge test.

[0087] S220, determining the current power of the motor according to the state data, and determining the current frequency of the motor according to the key phase signal.

[0088] Specifically, the status data includes the current data and voltage data of the motor. The current power of the motor can be determined based on the current data and voltage data; and the current frequency of the motor can be determined based on the key phase signal. The vibration data with the same power and frequency can be compared to accurately determine the vibration changes of the stator slot wedge; for variable frequency motors, the stator slot wedge can also be tested more accurately.

[0089] S230. Determine a current vibration value of the stator slot wedge according to vibration data of multiple points on at least one stator slot wedge in each phase band of the motor.

[0090] Specifically, the current vibration value of the stator slot wedge is determined based on the acquired vibration data of the stator slot wedge, and the vibration amplitude of the stator slot wedge can be determined in real time, which is convenient for analyzing the vibration condition of the stator slot wedge. When the vibration condition is abnormal, the staff can be reminded in time, thereby realizing the monitoring and analysis of the status of the stator slot wedge and achieving the effect of rapid detection.

[0091] S240: When the current vibration value is greater than a preset vibration value corresponding to the current power and the current frequency, it is determined that the vibration of the stator wedge is abnormal.

[0092] Specifically, a preset vibration value corresponding to the current power and the current frequency is determined, and the current vibration value is compared with the preset vibration value. If the current vibration value is greater than the preset vibration value, it indicates that the current vibration value of the stator slot wedge is too large, and it can be determined that the vibration of the stator slot wedge is abnormal, and the fastening state of the stator slot wedge is abnormal, thereby determining that the stator slot wedge is abnormal. By comparing the preset vibration value corresponding to the current power and the current frequency with the current vibration value, the vibration condition of the stator slot wedge can be determined more accurately, achieving the effect of accurately testing the stator slot wedge.

[0093] S250: When the vibration of the stator slot wedge is abnormal, it is determined that the stator slot wedge is abnormal and an alarm message is issued.

[0094] Specifically, if the vibration of the stator slot wedge is abnormal, the fastening state of the stator slot wedge is abnormal, and the stator slot wedge becomes loose, an alarm message will be issued to promptly remind the staff to repair the stator slot wedge.

[0095] Optionally, after the alarm signal is issued, the method further includes: outputting a maintenance list.

[0096] Specifically, when the fastening state of the stator slot wedge is abnormal, an alarm message is issued to remind the staff, and a maintenance list of the stator slot wedge is output. The maintenance list includes, for example, the number of the abnormal stator slot wedge, the vibration data of the abnormal stator slot wedge and a recommended maintenance plan, so that the staff can repair the stator slot wedge according to the maintenance list.

[0097] Figure 3 is a flowchart of another motor stator slot wedge monitoring and analysis method provided by an embodiment of the present invention. Optionally, refer to Figure 3 , the motor stator slot wedge monitoring and analysis methods include:

[0098] S310, obtaining vibration data of multiple points on at least one stator slot wedge in each phase band of the motor, obtaining a key phase signal of the motor, and obtaining state data of the motor.

[0099] S320. Determine the maximum vibration value and the average vibration value of each stator slot wedge according to the vibration data of multiple points on at least one stator slot wedge in each phase band of the motor.

[0100] Specifically, the vibration sensor can collect vibration data of multiple points on the stator slot wedge, determine the maximum vibration value and the average vibration value of the stator slot wedge according to the vibration data of the multiple points, and analyze the vibration of the stator slot wedge in combination with the maximum vibration value and the average vibration value, so as to more accurately determine the health of the stator slot wedge; avoid determining that the stator slot wedge is abnormal when the vibration value of a certain point is large and the average vibration value is small, thereby avoiding misjudgment and achieving the effect of accurately determining the health of the stator slot wedge.

[0101] S330. When it is determined according to the status data that the current power of the motor is unchanged, the difference between the maximum vibration value and the average vibration value is less than a first preset value, and the maximum vibration value is less than a second preset value, it is determined that the health of the stator wedge is in a normal state.

[0102] Specifically, when it is determined according to the status data that the current power of the motor is unchanged, the change of the maximum vibration value and the average vibration value of the stator slot wedge can be observed to more accurately determine the state of the stator slot wedge. When the current power of the motor is unchanged, the difference between the maximum vibration value and the average vibration value is less than the first preset value, and the maximum vibration value is less than the second preset value, indicating that the maximum vibration value and the average vibration value are less different, and the maximum vibration value and the average value are both small, the stator slot wedge is relatively tight, and it can be determined that the health of the stator slot wedge is in a normal state. Among them, the first preset value and the second preset value can be determined according to actual conditions, for example, according to the model of the motor, the size and material of the stator slot wedge and other parameters, and this embodiment does not limit this.

[0103] For example, Figure 4 Schematic diagram of the vibration analysis result of the stator slot wedge provided by the embodiment of the present invention. Figure 4 As shown, curve ① is the curve of the maximum vibration value of the stator slot wedge changing with time, curve ② is the curve of the average vibration value of the stator slot wedge changing with time, the horizontal axis of the curve is the running time of the motor, and the vertical axis of the curve is the per unit value of the stator slot wedge vibration. In the first stage t1, the difference between the maximum vibration value and the average vibration value is less than the first preset value, and the maximum vibration value is less than the second preset value, and the health of the stator slot wedge is in a normal state.

[0104] S340. When, as the motor running time changes, the maximum vibration value is greater than the second preset value, the change rate of the maximum vibration value is greater than the third preset value, and the change rate of the average vibration value is less than the fourth preset value, it is determined that the health of the stator slot wedge is in a state of needing attention.

[0105] Specifically, when it is determined according to the state data that the current power of the motor is unchanged, as the motor running time changes, the maximum vibration value is greater than the second preset value. If the change rate of the maximum vibration value is greater than the third preset value, and the change rate of the average vibration value is less than the fourth preset value, it indicates that the vibration value of the stator slot wedge is large, and the maximum vibration value increases rapidly, the average vibration value increases slowly, and the stator slot wedge is slightly loose, and it is determined that the health of the stator slot wedge is in a state of concern. The specific values ​​of the third preset value and the fourth preset value can be determined according to actual conditions, for example, according to the model of the motor, the size and material of the stator slot wedge and other parameters, and this embodiment does not limit this.

[0106] Exemplary, reference Figure 4 ,In the second stage, the maximum vibration value is large, and the rate of change of the maximum vibration value is large, and the average vibration value also increases slowly, indicating that the stator slot wedge is slightly loose, and it is determined that the health of the stator slot wedge is in a state of concern.

[0107] S350: When the rate of change of the maximum vibration value is less than the fifth preset value and the rate of change of the average vibration value is greater than the sixth preset value as the motor running time changes, it is determined that the health of the stator slot wedge is in an abnormal state.

[0108] Specifically, when it is determined according to the state data that the current power of the motor is unchanged, as the motor running time changes, the change rate of the maximum vibration value of the stator slot wedge is less than the fifth preset value, and the change rate of the average vibration value is greater than the sixth preset value, indicating that the maximum vibration value of the stator slot wedge is in a relatively stable state, the average vibration value has a large increase, and the vibration value of the stator slot wedge as a whole has a large increase, then the stator slot wedge is loose, and the health of the stator slot wedge is in an abnormal state. Among them, the fifth preset value and the sixth preset value can be determined according to actual conditions, for example, according to the model of the motor, the size and material of the stator slot wedge and other parameters, and this embodiment does not limit them.

[0109] Exemplary, reference Figure 4 In the third stage t3, the maximum vibration value of the stator slot wedge increases slowly, the average vibration value increases rapidly, the overall vibration value of the stator slot wedge increases greatly, the stator slot wedge becomes loose, and the health of the stator slot wedge is in an abnormal state.

[0110] S360. As the motor running time changes, the change rate of the maximum vibration value is less than the seventh preset value, the change rate of the average vibration value is greater than the eighth preset value, and the difference between the average vibration value and the maximum vibration value is less than the ninth preset value, determining that the health of the stator slot wedge is in a seriously abnormal state.

[0111] Specifically, when it is determined according to the state data that the current power of the motor is unchanged, as the motor running time changes, the change rate of the maximum vibration value is less than the seventh preset value, the change rate of the average vibration value is greater than the eighth preset value, and the difference between the average vibration value and the maximum vibration value is less than the ninth preset value, indicating that the maximum vibration value is in a relatively stable state, the average vibration value changes greatly, and the average vibration value is close to the maximum vibration value, that is, the vibration values ​​of each point of the stator slot wedge are large, indicating that the stator slot wedge is in a critical state of complete looseness, and the health of the stator slot wedge is in a serious abnormal state. Among them, the seventh preset value, the eighth preset value and the ninth preset value can be determined according to actual conditions, for example, according to the model of the motor, the size and material of the stator slot wedge and other parameters, and this embodiment does not limit them.

[0112] Exemplary, reference Figure 4 In the fourth stage t4, the maximum vibration value of the stator slot wedge tends to be stable, the average vibration value varies greatly, and the average vibration value is close to the maximum vibration value, that is, the vibration values ​​of each point of the stator slot wedge are large, the stator slot wedge is in a critical state of complete looseness, and the health of the stator slot wedge is in a serious abnormal state.

[0113] S370: When the health of the stator slot wedge is in a state of needing attention, an abnormal state, or a serious abnormal state, an alarm message is issued.

[0114] Specifically, when the health of the stator slot wedge is in a state of needing attention, an abnormal state, or a serious abnormal state, it indicates that the stator slot wedge is loose and the fastening state of the stator slot wedge is abnormal, and the control module will issue an alarm message to remind the staff to perform maintenance in time. Exemplarily, the control module can issue different alarm messages according to different states of the health of the stator slot wedge, so that the staff can determine the degree of abnormality of the stator slot wedge according to the alarm information.

[0115] Figure 5 is a flowchart of another motor stator slot wedge monitoring and analysis method provided by an embodiment of the present invention. Optionally, refer to Figure 5 , the motor stator slot wedge monitoring and analysis methods include:

[0116] S410, obtaining vibration data of multiple points on at least one stator slot wedge in each phase band of the motor, obtaining a key phase signal of the motor, and obtaining state data of the motor.

[0117] S420. Determine the through-frequency vibration value of each stator slot wedge according to the vibration data of multiple points on at least one stator slot wedge in each phase band of the motor; wherein the through-frequency vibration value is the vector sum of the vibration amplitudes of all the vibration data.

[0118] Specifically, the vibration amplitude corresponding to the vibration data is determined based on multiple vibration data on the stator slot wedge, so as to determine the through-frequency vibration value of the stator slot wedge; the vibration state of the stator slot wedge can be determined based on the through-frequency vibration value. For example, when the through-frequency vibration value is large, the stator slot wedge vibrates more and may become loose; when the through-frequency vibration value is small, the stator slot wedge vibrates less and the stator slot wedge is tighter.

[0119] S430, determining the main frequency vibration component of the stator slot wedge according to the state data and the vibration data.

[0120] Specifically, the current frequency of the motor can be determined according to the state data, and the main frequency of the stator slot wedge can be determined according to the current frequency of the motor; the vibration data of the stator slot wedge is Fourier transformed to convert the vibration data into the frequency domain, thereby determining the main frequency vibration component of the stator slot wedge, that is, the component with the largest vibration. And, if the frequency corresponding to the main frequency vibration component in the frequency domain curve of the stator slot wedge is consistent with the main frequency of the stator slot wedge determined according to the current frequency of the motor, it indicates that the stator slot wedge is relatively tight.

[0121] S440: When the through-frequency vibration value is less than the tenth preset value, and the proportion of the main frequency vibration component in all frequency components is greater than the eleventh preset value, it is determined that the health of the stator slot wedge is in a normal state.

[0122] Specifically, when the through-frequency vibration value is less than the tenth preset value, and the proportion of the main frequency vibration component in all frequency components is greater than the eleventh preset value, it indicates that the vibration amplitude of the stator slot wedge is small, the clutter component is small, and the vibration of the stator slot wedge is small, and it can be determined that the health of the stator slot wedge is in a normal state. The specific values ​​of the tenth preset value and the eleventh preset value can be determined according to actual conditions, and this embodiment does not limit them.

[0123] S450: When the rate of change of the through-frequency vibration value is greater than zero as the motor running time changes, and the rate of change of the proportion of the main frequency vibration component in all frequency components is less than zero, it is determined that the health of the stator slot wedge is in a state of needing attention.

[0124] Specifically, when the rate of change of the through-frequency vibration value is greater than zero and the rate of change of the proportion of the main frequency vibration component in all frequency components is less than zero as the motor running time changes, it indicates that the through-frequency vibration value begins to increase, the proportion of the main frequency vibration component decreases, and the proportion of the noise component increases. The stator slot wedge begins to loosen, and the degree of looseness is increasing. The health of the stator slot wedge is in a state of needing attention.

[0125] S460: When the through-frequency vibration value is greater than the twelfth preset value, and the proportion of the main frequency vibration component in all frequency components is less than the thirteenth preset value, it is determined that the health of the stator slot wedge is in an abnormal state.

[0126] Specifically, when the through-frequency vibration value is greater than the twelfth preset value, and the proportion of the main frequency vibration component in all frequency components is less than the thirteenth preset value, it indicates that the through-frequency vibration value is large, and the proportion of the main frequency vibration component of the exciting force is reduced, the stator slot wedge is in a critical state of complete looseness, and the subsequent stator slot wedge will experience accelerated wear, and the health of the stator slot wedge is in an abnormal state. Among them, the twelfth preset value and the thirteenth preset value can be determined according to actual conditions, and this embodiment does not limit them.

[0127] S470: When the health of the stator slot wedge is in a state of concern or an abnormal state, an alarm message is issued.

[0128] Specifically, when the health of the stator slot wedge is in a state of needing attention or an abnormal state, it indicates that the stator slot wedge is loose and the fastening state of the stator slot wedge is abnormal, and the control module will issue an alarm message to remind the staff to perform maintenance in time. Exemplarily, the control module can issue different alarm messages according to different states of the health of the stator slot wedge, so that the staff can determine the degree of abnormality of the stator slot wedge according to the alarm information.

[0129] Figure 6 is a flowchart of another motor stator slot wedge monitoring and analysis method provided by an embodiment of the present invention. Optionally, refer to Figure 6 , the motor stator slot wedge monitoring and analysis methods include:

[0130] S510, obtaining vibration data of multiple points on at least one stator slot wedge in each phase band of the motor, obtaining a key phase signal of the motor, and obtaining state data of the motor.

[0131] S520. Determine an average vibration value of each stator slot wedge according to vibration data of multiple points on at least one stator slot wedge in each phase band of the motor.

[0132] Specifically, the vibration sensor can collect vibration data of multiple points on the stator slot wedge, and determine the average vibration value of the stator slot wedge based on the vibration data of the multiple points. The average vibration value can reflect the overall vibration state of the stator slot wedge, which is convenient for testing the stator slot wedge.

[0133] S530. When it is determined according to the status data that the power of the motor is unchanged, the rate of change of the average vibration value of the stator slot wedge is greater than the fourteenth preset value, and when it is determined according to the status data that the rate of change of the temperature of the motor is greater than the fifteenth preset value, it is determined that the health of the stator slot wedge is in an abnormal state.

[0134] Specifically, when the power of the motor is determined to be unchanged according to the state data, the change rate of the average vibration value of the stator slot wedge is greater than the fourteenth preset value, and when the change rate of the temperature of the motor is determined to be greater than the fifteenth preset value according to the state data, it indicates that the average vibration value of the stator slot wedge is large, that is, the overall vibration of the stator slot wedge is serious; and the stator winding temperature also rises, indicating that the vibration of the stator wire bar increases, causing the stator winding temperature to rise, and continued operation will wear the main insulation of the stator wire bar, and the health of the stator slot wedge is in an abnormal state. Among them, the fourteenth preset value and the fifteenth preset value can be determined according to actual conditions, for example, according to parameters such as the motor model, the size and material of the stator slot wedge, and this embodiment does not limit this.

[0135] S540: When the health of the stator slot wedge is in an abnormal state, an alarm message is issued.

[0136] Specifically, when the health of the stator slot wedge is in an abnormal state, indicating that the stator slot wedge is loose and the fastening state of the stator slot wedge is abnormal, the control module will issue an alarm message to remind the staff to perform maintenance in time. Exemplarily, the control module can issue different alarm messages according to different states of the health of the stator slot wedge, so that the staff can determine the degree of abnormality of the stator slot wedge according to the alarm information.

[0137] Figure 7 is a flowchart of another motor stator slot wedge monitoring and analysis method provided by an embodiment of the present invention. Optionally, refer to Figure 7 , the motor stator slot wedge monitoring and analysis methods include:

[0138] S610, obtaining vibration data of multiple points on at least one stator slot wedge in each phase band of the motor, obtaining a key phase signal of the motor, and obtaining state data of the motor.

[0139] S620: Establish a corresponding relationship between the looseness amount according to the vibration data, stator parameters and looseness amount of the stator slot wedge of the motor of the same model as the motor.

[0140] Specifically, a looseness correspondence relationship can be established based on pre-stored vibration data, stator parameters and looseness of the stator slot wedges of the motor of the same model as the motor. The correspondence relationship can be a model, a lookup table or other forms.

[0141] S630, determining the remaining looseness of the stator slot wedge according to the current vibration data of the stator slot wedge, the current stator parameters in the state data, and the corresponding relationship.

[0142] Specifically, by substituting the current vibration data and current stator parameters of the stator slot wedge into the corresponding relationship, the current looseness of the stator slot wedge can be determined, and the remaining looseness of the stator slot wedge can be determined by subtracting the current looseness from the pre-stored maximum looseness of the stator slot wedge of the motor of the same model as the motor.

[0143] S640: When the remaining looseness of the stator slot wedge is less than the preset looseness, an alarm message is issued.

[0144] Specifically, the preset looseness is, for example, the residual looseness corresponding to the stator slot wedge abnormality. When the residual looseness is less than the preset looseness, it indicates that the residual looseness of the stator slot wedge is small, the looseness of the stator slot wedge is large, and the stator slot wedge is abnormal. The control module will issue an alarm message to remind the staff to perform maintenance in time.

[0145] Optionally, the motor stator slot wedge monitoring and analysis method further includes: displaying at least one of the vibration condition, health status and residual looseness of the stator slot wedge.

[0146] Specifically, at least one of the vibration condition, health condition and residual looseness of the stator slot wedge can be displayed in a graphical form, which is convenient for the staff to observe the state of the stator slot wedge in real time, thereby achieving the effect of quickly testing the stator slot wedge.

[0147] Figure 8 is a schematic diagram of a motor stator slot wedge monitoring and analysis device provided by an embodiment of the present invention, with reference to Figure 8The motor stator slot wedge monitoring and analysis device includes: a sensor module 710 and a control module 720; the sensor module 710 is connected to the control module 720, and the sensor module 710 is used to collect the sensor data and the status data of the motor; the control module 720 is used to obtain the sensor data and the status data of the motor; the fastening state of the stator slot wedge is determined according to the sensor data and the status data, wherein the fastening state includes at least one of the vibration condition, the health degree and the remaining looseness; when the stator slot wedge is determined to be abnormal according to the fastening state, an alarm message is issued; wherein the sensor data includes the vibration data of the stator slot wedge of the motor and the key phase signal of the motor.

[0148] Specifically, the sensor module 710 collects sensor data and state data of the motor, for example, collects vibration data of the stator slot wedge of the motor through a capacitive vibration sensor, and collects key phase signals of the motor through an eddy current sensor, and the control module can obtain the sensor data and state data of the motor from the sensor. The control module 720 is, for example, a master control system of a power station, or other controllers, which are not limited in this embodiment.

[0149] Exemplarily, the motor is, for example, a driving machine of an auxiliary machine of a power plant, that is, a machine that provides assistance for the generator to generate electricity. The motor can, for example, drive the fan system and the water pump system in the boiler system and the steam turbine system. The state data of the motor includes, for example, the actual power of the generator set, the total fuel amount of the boiler, the main steam flow, the total air volume and other overall data, as well as the flue gas flow, wind pressure, wind temperature, damper damper opening of the fan system; the total flow and pressure of the water pump system, as well as the motor stator current, stator current frequency, stator voltage, stator winding temperature, cold air temperature, hot air temperature and other data. The control module 720 can determine whether the running state of the motor is normal according to the state data of the motor. If the running state of the motor is normal, the vibration data of the stator slot wedge of the motor is analyzed, and the state of the stator slot wedge can be analyzed more accurately, thereby determining the degree of looseness of the stator slot wedge. The control module 720 determines the fastening state of the stator slot wedge according to the sensor data and the state data, and can determine whether the stator slot wedge is loose, thereby determining whether the stator slot wedge is abnormal. When the fastening state is abnormal, it indicates that the stator slot wedge is loose, and it can be determined that the stator slot wedge is abnormal. Exemplarily, when the control module 720 determines whether the stator slot wedge is abnormal based on the fastening state, it can make a judgment based on at least one of the vibration condition, health, and remaining looseness. When the control module 720 determines that the motor is operating normally based on the state data, the current frequency of the motor can be determined through the key phase signal, and the vibration data of the stator slot wedge corresponding to the current frequency can be compared with the preset vibration data corresponding to the current frequency to determine whether the vibration of the stator slot wedge is abnormal; therefore, by collecting the vibration data of the stator slot wedge in real time, it can be determined in real time whether the vibration of the stator slot wedge is abnormal, thereby achieving the effect of quickly testing the stator slot wedge; when the control module 720 determines that the motor is operating normally based on the state data, the health of the stator slot wedge can be determined based on the vibration data of the stator slot wedge, and it can be determined whether the health of the stator slot wedge is in a normal state or an abnormal state, and also It is a serious abnormal state, so as to judge in real time whether the looseness of the stator slot wedge is abnormal, so as to achieve the effect of quickly testing the stator slot wedge; when the control module 720 determines that the motor is operating normally according to the state data, the current frequency of the motor can be determined according to the key phase signal, the current stator parameters in the motor can be determined according to the state data, and the remaining looseness of the stator slot wedge can be determined according to the current frequency, the current stator parameters and the current vibration data; the looseness of the stator slot wedge can be judged in real time according to the remaining looseness, so as to achieve the effect of quickly testing the stator slot wedge; and, the looseness of the stator slot wedge can be judged in combination with the key phase signal and the state data of the motor, so as to test the stator slot wedge more accurately. When it is judged that the vibration of the stator slot wedge is abnormal, or the health of the stator slot wedge is low, or the stator slot wedge is seriously loose, the control module will issue an alarm message to remind the staff to repair the stator slot wedge in time.

[0150] Fig. 9is a schematic diagram of the structure of another motor stator slot wedge monitoring and analysis device provided by an embodiment of the present invention. Optionally, refer to Fig. 9 The sensing module 710 includes a capacitive vibration sensor 711 and an eddy current sensor; the capacitive vibration sensor 711 is arranged on the stator slot wedge 810 in each phase belt, and at least one capacitive vibration sensor 711 is arranged in each phase belt, and the capacitive vibration sensor 711 is used to collect vibration data of multiple points of the stator slot wedge; the eddy current sensor is used to collect the key phase signal of the motor.

[0151] Specifically, at least one capacitive vibration sensor 711 is provided in each phase belt, for example, one capacitive vibration sensor 711 is provided in each phase belt. Fig. 9 As shown, the capacitive vibration sensors 711 are evenly distributed along the circumferential direction of the iron core 820. The capacitive vibration sensor 711 is a thin-sheet sensor. The capacitive vibration sensor 711 can be fixed on the stator slot wedge 810 by an adhesive, so that the vibration data of multiple points on the stator slot wedge 810 can be detected. The capacitive vibration sensor 711 is set on the stator slot wedge 810 in each phase band, and the stator slot wedge in each phase band can be analyzed. The eddy current sensor can detect the key phase signal of the motor, which is convenient for determining the frequency of the motor, so that the stator slot wedge can be tested and analyzed regardless of whether the motor is a fixed frequency motor or a variable frequency motor. Among them, the eddy current sensor is set near the key phase slot of the motor, the key phase slot is set on the rotating shaft of the motor, and the key phase slot is aligned with the center position of the adjacent magnetic pole of the rotor.

[0152] Exemplarily, before the capacitive vibration sensor 711 and the eddy current sensor perform detection, the parameters of the capacitive vibration sensor 711 and the eddy current sensor can be set by the control module 720, such as setting parameters such as sensitivity, sampling rate, number and range, so as to improve the accuracy of detection.

[0153] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0154] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for monitoring and analyzing a motor stator slot wedge, characterized in that: include: Acquire sensor data and status data of the motor; wherein the sensor data includes vibration data of the stator slot wedge of the motor and key phase signal of the motor; wherein the status data includes actual power generation of the generator set, total fuel quantity of the boiler, main steam flow and total air volume, and the status data also includes flue gas flow, wind pressure, wind temperature and damper opening of the fan system; the status data also includes total flow and pressure of the water pump system; the status data also includes stator current, stator current frequency, stator voltage, stator winding temperature, cold air temperature and hot air temperature of the motor; Determining a tightening state of the stator slot wedge according to the sensing data and the state data, wherein the tightening state includes at least one of a vibration condition, a health degree, and a residual looseness; When it is determined according to the fastening state that the stator slot wedge is abnormal, an alarm message is issued; Determining the fastening state of the stator slot wedge according to the sensor data and the state data includes at least one of the following: Determining a vibration condition of the stator slot wedge according to the sensor data and the state data; determining the health of the stator wedge according to the sensor data and the status data; Determining the remaining looseness of the stator slot wedge according to the sensor data and the state data; Determining the vibration condition of the stator slot wedge according to the sensor data and the state data includes: Determine the current power of the motor according to the state data, and determine the current frequency of the motor according to the key phase signal; Determining a current vibration value of the stator slot wedge according to vibration data of a plurality of points on at least one stator slot wedge in each phase band of the motor; When the current vibration value is greater than a preset vibration value corresponding to the current power and the current frequency, determining that the vibration of the stator slot wedge is abnormal; Determining the health of the stator wedge according to the sensor data and the status data includes: When the normal operation of the motor is determined according to the status data, the health of the stator slot wedge is determined according to the vibration data of the stator slot wedge; Determining the remaining looseness of the stator slot wedge according to the sensor data and the state data includes: Establishing a corresponding relationship between the looseness amount according to the vibration data, stator parameters and looseness amount of the stator slot wedge of the motor of the same model as the motor; The remaining looseness of the stator slot wedge is determined according to the current vibration data of the stator slot wedge, the current stator parameters in the state data and the corresponding relationship.

2. The method according to claim 1, characterized in that Get the sensor data of the motor, including: The vibration data of multiple points on at least one stator slot wedge in each phase band of the motor are obtained, and the key phase signal of the motor is obtained.

3. The method according to claim 1, characterized in that When it is determined according to the fastening state that the stator slot wedge is abnormal, an alarm message is issued, including: When the vibration of the stator slot wedge is abnormal, it is determined that the stator slot wedge is abnormal and an alarm message is issued.

4. The method according to claim 1, characterized in that: Determining the health of the stator wedge according to the sensor data and the status data includes: Determine the maximum vibration value and the average vibration value of each stator slot wedge according to the vibration data of multiple points on at least one stator slot wedge in each phase band of the motor; When it is determined according to the state data that the current power of the motor is unchanged, when the difference between the maximum vibration value and the average vibration value is less than a first preset value, and when the maximum vibration value is less than a second preset value, it is determined that the health of the stator wedge is in a normal state; When, as the motor running time changes, the maximum vibration value is greater than the second preset value, the change rate of the maximum vibration value is greater than the third preset value, and the change rate of the average vibration value is less than the fourth preset value, it is determined that the health of the stator slot wedge is in a state of needing attention; When the rate of change of the maximum vibration value is less than a fifth preset value and the rate of change of the average vibration value is greater than a sixth preset value as the motor running time changes, it is determined that the health of the stator slot wedge is in an abnormal state; As the motor running time changes, the change rate of the maximum vibration value is less than the seventh preset value, the change rate of the average vibration value is greater than the eighth preset value, and the difference between the average vibration value and the maximum vibration value is less than the ninth preset value, and it is determined that the health of the stator slot wedge is in a serious abnormal state; When it is determined according to the fastening state that the stator slot wedge is abnormal, an alarm message is issued, including: When the health of the stator slot wedge is in a state of needing attention, an abnormal state or a serious abnormal state, an alarm message is issued.

5. The method according to claim 1, characterized in that Determining the health of the stator wedge according to the sensor data and the status data includes: Determine the through-frequency vibration value of each stator slot wedge according to the vibration data of multiple points on at least one stator slot wedge in each phase band of the motor; wherein the through-frequency vibration value is the vector sum of the vibration amplitudes of all vibration data; Determining a main frequency vibration component of the stator slot wedge according to the state data and the vibration data; When the through-frequency vibration value is less than a tenth preset value, and the proportion of the main frequency vibration component in all frequency components is greater than an eleventh preset value, it is determined that the health of the stator slot wedge is in a normal state; When the rate of change of the through-frequency vibration value is greater than zero and the rate of change of the proportion of the main frequency vibration component in all frequency components is less than zero as the motor runs for a certain period of time, it is determined that the health of the stator slot wedge is in a state of needing attention; When the through-frequency vibration value is greater than a twelfth preset value, and the proportion of the main frequency vibration component in all frequency components is less than a thirteenth preset value, it is determined that the health of the stator slot wedge is in an abnormal state; When it is determined according to the fastening state that the stator slot wedge is abnormal, an alarm message is issued, including: When the health of the stator slot wedge is in a state of needing attention or an abnormal state, an alarm message is issued.

6. The method according to claim 1, characterized in that Determining the health of the stator wedge according to the sensor data and the status data includes: Determining an average vibration value of each stator slot wedge according to vibration data of a plurality of points on at least one stator slot wedge in each phase band of the motor; When it is determined according to the state data that the power of the motor is unchanged, the rate of change of the average vibration value of the stator slot wedge is greater than a fourteenth preset value, and when it is determined according to the state data that the rate of change of the temperature of the motor is greater than a fifteenth preset value, it is determined that the health of the stator slot wedge is in an abnormal state; When it is determined according to the fastening state that the stator slot wedge is abnormal, an alarm message is issued, including: When the health of the stator slot wedge is in an abnormal state, an alarm message is issued.

7. The method according to claim 1, characterized in that When it is determined according to the fastening state that the stator slot wedge is abnormal, an alarm message is issued, including: When the remaining looseness of the stator slot wedge is less than the preset looseness, an alarm message is issued.

8. A motor stator slot wedge monitoring and analysis device, characterized in that: The motor stator slot wedge monitoring and analysis device is used to perform the motor stator slot wedge monitoring and analysis method according to any one of claims 1 to 7, and the motor stator slot wedge monitoring and analysis device comprises: a sensor module and a control module; The sensing module is connected to the control module, and the sensing module is used to collect sensing data and status data of the motor; the control module is used to obtain the sensing data and status data of the motor; the fastening state of the stator slot wedge is determined according to the sensing data and the status data, wherein the fastening state includes at least one of vibration condition, health degree and residual looseness; when the stator slot wedge is determined to be abnormal according to the fastening state, an alarm message is issued; wherein the sensing data includes vibration data of the stator slot wedge of the motor and a key phase signal of the motor.

9. The motor stator slot wedge monitoring and analysis device according to claim 8, characterized in that: The sensing module includes a capacitive vibration sensor and an eddy current sensor; The capacitive vibration sensor is arranged on the stator slot wedge in each phase belt, and at least one capacitive vibration sensor is arranged in each phase belt, and the capacitive vibration sensor is used to collect vibration data of multiple points of the stator slot wedge; The eddy current sensor is used to collect the key phase signal of the motor.

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