Motor fault intelligent diagnosis system and method
By setting up a cold air device and air guide duct outside the motor housing, combined with an infrared thermal imager, determining whether the bearing has eccentric rotation or vibration based on the cold air trajectory, the problem that the prior art cannot diagnose specific faults of motor bearing overheating is solved, and the accurate diagnosis of bearing failures is achieved.
Patent Information
- Application Number
- CN202411799008.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2025-03-14
AI Technical Summary
The prior art cannot diagnose specific bearing failures when motor bearings are overheated.
By setting up a cold air device and air guide duct outside the motor housing, the cold air is transported to the peripheral area of the bearing, and using an infrared thermal imager to collect thermal imaging images of the bearing and peripheral area, and determine whether the bearing has eccentric rotation or vibration based on the cold air trajectory, thereby determining the specific fault that causes overheating.
It realizes accurate diagnosis of specific faults of motor bearing overheating, and the method is simple and effective.
Smart Images
Figure CN119618646A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the field of motor fault diagnosis, and in particular relates to a motor fault intelligent diagnosis system and method. Background Art
[0002] The motor is one of the most commonly used equipment in the industry. Its internal structure is complex, and its bearing is an indispensable and important component. The bearing is mainly used to support the rotor of the motor and to maintain the distance between the rotor and the stator. In addition, during the operation of the motor, the bearing must also withstand the gravity and inertia force from the rotor and the motor load, so its service life and quality have a decisive influence on the final performance of the entire motor. During the use of the motor, the bearing is a high-failure part, and timely diagnosis of bearing failure is one of the important tasks of equipment maintenance. At present, when diagnosing bearing failures, usually only the temperature of the bearing is tested to determine whether the bearing is faulty, but the specific failure of the bearing cannot be diagnosed. Summary of the invention
[0003] The present invention provides a motor fault intelligent diagnosis system and method, so as to solve the current problem that the specific fault of the bearing cannot be diagnosed when the motor bearing is overheated.
[0004] According to a first aspect of an embodiment of the present invention, there is provided a motor fault intelligent diagnosis system, comprising a cooling device, an air duct and an infrared thermal imager, wherein the cooling device is arranged outside the motor housing, and is connected to a peripheral area of a bearing through the air duct, and an outlet of the air duct is arranged in a radial direction of the bearing, and the infrared thermal imager faces a cross section of a rotating shaft of the bearing; the peripheral area of the bearing is an area between the bearing and the motor housing;
[0005] When the bearing is overheated, the cooling air device radially delivers cooling air to the peripheral area of the bearing through the air duct, and the infrared thermal imager collects thermal images of the bearing and the peripheral area of the bearing; based on the cold air trajectory in the thermal image, it is determined whether the bearing has eccentric rotation and whether the bearing has vibration.
[0006] In an optional implementation, when the bearing vibrates, the vibration characteristics are determined based on the cold air trajectory, and the specific fault causing the bearing overheating is determined based on the vibration characteristics.
[0007] In another optional implementation, the controller further includes a controller, a processor, and a temperature measuring device for detecting the bearing temperature. The controller is connected to the temperature measuring device, the cooling device, and the infrared thermal imager, respectively. When it is determined that the bearing temperature exceeds the set temperature and the bearing is overheated, the cooling device controls the cooling device to deliver the corresponding amount and temperature of cooling air to the surrounding area of the bearing through the air duct at the set pressure and the corresponding delivery speed according to the bearing temperature, and starts the infrared thermal imager to collect thermal images of the bearing and the surrounding area of the bearing;
[0008] The processor is connected to the infrared thermal imager, and identifies the cold wind track in the thermal image according to a plurality of continuous thermal images collected by the infrared thermal imager, so as to determine whether the bearing has eccentric rotation and whether the bearing has vibration.
[0009] In another optional implementation, a speed sensor for detecting the speed of the bearing is further included, and the controller is connected to the speed sensor. For bearings with different speeds, the controller locally stores the amount of cold air required to be provided for the bearing to be normally operated at the speed starting from the moment of cold air delivery, when the rotation time of the bearing reaches the set acquisition time of the infrared thermal imager, and the cold air just circumferentially surrounds the bearing;
[0010] The controller determines the amount of cold air delivered by the cold air device according to the detected bearing rotation speed; determines the delivery speed of the cold air according to the determined amount of cold air and the set acquisition time of the infrared thermal imager; determines the temperature of the cold air according to the temperature resolution of the infrared thermal imager and the detected bearing temperature, so that the infrared thermal imager can distinguish the boundary between the bearing and the cold air when the cold air just circumferentially surrounds the bearing; the controller controls the cold air device to deliver the cold air of the determined corresponding amount and temperature to the surrounding area of the bearing through the air duct at the set pressure and the determined delivery speed;
[0011] The controller controls the infrared thermal imager to start, so that it collects thermal images of the bearing and the surrounding area of the bearing within a set collection time.
[0012] In another optional implementation, the air guide ducts are multiple and circumferentially distributed around the bearing.
[0013] According to a second aspect of an embodiment of the present invention, a diagnostic method of the above-mentioned motor fault intelligent diagnostic system is provided, comprising:
[0014] Step S100, the controller determines whether the detected bearing temperature is greater than the set temperature. If so, it means that the bearing is overheated, and step S200 is executed. Otherwise, the controller returns to step S100.
[0015] Step S200, the controller controls the cold air device to set the pressure and the corresponding delivery speed, and delivers the cold air of the corresponding amount and the corresponding temperature to the surrounding area of the bearing;
[0016] Step S300, the controller controls the infrared thermal imager to collect thermal images of the bearing and the surrounding area of the bearing within a set collection time, to obtain multiple thermal images;
[0017] Step S400: The processor aligns and overlaps the multiple thermal images collected continuously to obtain a cold air trajectory, and determines whether the bearing has eccentric rotation and whether the bearing has vibration according to the cold air trajectory.
[0018] In another optional implementation, in step S200, for bearings with different rotation speeds, the controller locally stores the amount of cold air required to be provided for the bearing to be normally operated at the rotation speed starting from the moment of cold air delivery, when the rotation time reaches the set acquisition time of the infrared thermal imager;
[0019] The step S200 specifically includes: the controller determines the amount of cold air Q1 delivered by the cold air device according to the detected bearing rotation speed; determines the delivery speed V1 of the cold air according to the determined amount of cold air Q1 and the set acquisition time of the infrared thermal imager; determines the temperature T of the cold air according to the temperature resolution of the infrared thermal imager and the detected bearing temperature, so that the infrared thermal imager can distinguish the boundary between the bearing and the cold air when the cold air just circumferentially surrounds the bearing;
[0020] The controller controls the cold air device to deliver cold air of a determined corresponding amount Q1 and a corresponding temperature T to the surrounding area of the bearing through the air duct at a set pressure and a determined delivery speed V1.
[0021] In another optional implementation, the step S400 further includes: when the bearing vibrates, determining the vibration characteristics according to the cold air trajectory, and determining the specific fault causing the bearing overheating according to the vibration characteristics.
[0022] In another optional implementation, the step S400 specifically includes:
[0023] Step S410: The processor aligns and overlaps the multiple continuously collected thermal images to obtain a cold air trajectory, and determines the inscribed circles corresponding to the majority of cold air arc segments in the cold air trajectory;
[0024] Step S420, determining whether the maximum value of the distance between each adjacent cold air arc segment in the inscribed circle is greater than the corresponding distance, if so, it means that the cold air does not circumferentially surround the bearing, and the cold air cannot fully reflect the vibration characteristics of the bearing, and executing step S430; otherwise, it means that the cold air circumferentially surrounds the bearing, and the cold air can fully reflect the vibration characteristics of the bearing, and executing step S440;
[0025] Step S430, sending a command to increase the amount of cold air to the controller, so that after receiving the command, the controller first determines the current increased amount of cold air Q2 to be delivered, determines the delivery speed V2 of the cold air according to the determined cold air amount Q2 and the set acquisition time of the infrared thermal imager, and then controls the cold air device to deliver the cold air of the determined corresponding amount Q2 and the corresponding temperature T to the surrounding area of the bearing at the set pressure and the determined delivery speed V2; and controls the infrared thermal imaging image to collect thermal images of the bearing and the surrounding area of the bearing within its set acquisition time, obtains multiple thermal images, increases the cold air amount Q2 step by step, and returns to execute step S410;
[0026] Step S440, align and overlap the multiple thermal images collected continuously to obtain a cold wind trajectory, and determine whether there is a situation in which the corresponding end of at least one cold wind arc segment in the cold wind trajectory is bent outward. If so, it indicates that the bearing vibrates, and the vibration direction and vibration amplitude of the bearing are determined according to the cold wind arc segment with the corresponding end bent outward. The specific fault causing the overheating of the bearing is determined according to the vibration direction and vibration amplitude, and step S450 is executed. Otherwise, it indicates that the bearing does not vibrate, and step S450 is executed;
[0027] Step S450, determine the inscribed circle corresponding to the majority of cold air arc segments in the cold air trajectory; determine whether the center of the inscribed circle deviates from the expected center. If so, it indicates that the bearing has eccentric rotation. According to the positional relationship between the center of the inscribed circle and the expected center, determine the eccentricity of the bearing. Otherwise, it indicates that the bearing has not eccentric rotation.
[0028] In another optional implementation, the corresponding distance in step S420 is determined by the rotational speed of the bearing and the acquisition rate of the infrared thermal imager.
[0029] The beneficial effects of the present invention are:
[0030] 1. The present invention delivers cold air to the peripheral area of the bearing, and determines whether the bearing has eccentric rotation and vibration according to the trajectory formed by the cold air as the bearing rotates. The method is simple and can determine the specific fault that causes the bearing to overheat;
[0031] 2. The present invention determines the amount of cold air delivered to the surrounding area of the bearing according to the bearing rotation speed, so that the time taken for the cold air to diffuse and form a closed loop when the bearing rotates at different speeds is the same, so that the number of thermal images collected by the infrared thermal imager within this time is also the same and more, and the thermal images can reflect the vibration changes of bearings with different rotation speeds within the same time after being aligned and overlapped. It can be seen that even if the bearing rotation speeds are different, more thermal images can fully reflect the vibration characteristics of the bearing after being aligned and overlapped;
[0032] 3. In view of the situation that the thermal imaging image is collected but the cold air does not circumferentially surround the bearing, the present invention controls the cold air device to continue to provide additional cold air to the surrounding area of the bearing, thereby ensuring that the cold air can always circumferentially surround the bearing, so that the cold air trajectory fully reflects the vibration characteristics of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] Figure 1 is a side perspective view of an embodiment of the motor fault intelligent diagnosis system of the present invention;
[0034] Figure 2 It is a working principle block diagram of an embodiment of the motor fault intelligent diagnosis system of the present invention;
[0035] Figure 3 It is a flow chart of an embodiment of the intelligent diagnosis method of motor faults of the present invention. DETAILED DESCRIPTION
[0036] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention and to make the above-mentioned purposes, features and advantages of the embodiments of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings.
[0037] In the description of the present invention, unless otherwise specified and limited, it should be noted that the term "connection" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two elements. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.
[0038] See also Figure 1, is a side perspective view of an embodiment of the intelligent diagnosis system for motor faults of the present invention. The intelligent diagnosis system for motor faults may include a cooling device 1, an air duct 2 and an infrared thermal imager 3. The cooling device 1 is arranged outside the motor housing 4, and is connected to the bearing peripheral area 5 through the air duct 2. The outlet of the air duct 2 is arranged in the radial direction of the bearing 6. The infrared thermal imager 3 faces the rotating shaft section of the bearing. The bearing peripheral area 5 is the area between the bearing 6 and the motor housing 4. When the bearing 6 is overheated, the cooling device 1 radially delivers cold air to the bearing peripheral area 5 through the air duct 2. The infrared thermal imager 3 collects thermal images of the bearing 6 and the bearing peripheral area 5. According to the cold air trajectory in the thermal image, it is determined whether the bearing 6 rotates eccentrically and whether the bearing 6 vibrates.
[0039] Since the bearing will cause the air around it to flow during rotation, thus driving the cold air delivered to the bearing's surrounding area to diffuse circumferentially, and the bearing vibration will also cause the air around it to flow, thus driving the cold air in the bearing's surrounding area to move in the vibration direction, the cold air trajectory in the thermal imaging image can be used to reflect the bearing's axial position and the bearing's vibration. When the bearing vibrates, the vibration characteristics can be determined based on the cold air trajectory, and the specific fault that caused the bearing to overheat can be determined based on the vibration characteristics.
[0040] Among them, combined Figure 2 As shown, the motor fault intelligent diagnosis system may include a controller, a processor and a temperature measuring device for detecting the bearing temperature. The controller is respectively connected to the temperature measuring device, the cooling air device and the infrared thermal imager. When it is determined that the bearing temperature exceeds the set temperature and the bearing is overheated, the cooling air device is controlled according to the bearing temperature to pass through the air duct to set the pressure and the corresponding delivery speed, and the corresponding amount and temperature of cold air are delivered to the surrounding area of the bearing, and the infrared thermal imager is started to collect thermal images of the bearing and the surrounding area of the bearing; the processor is connected to the infrared thermal imager, and according to the continuous multiple thermal images collected by the infrared thermal imager, the cold air trajectory in the thermal image is identified to determine whether the bearing has eccentric rotation and whether the bearing vibrates.
[0041] In this embodiment, the air duct can be multiple and circumferentially distributed around the bearing. The set pressure can be a fixed value, so that the cold air is sprayed to the peripheral area of the bearing, not in contact with the bearing but within the range of the air flow effect that can be induced by the bearing, so that the air flow effect caused by the bearing rotation can be fully utilized, so that the cold air can be quickly diffused in the circumferential direction. Due to different bearing speeds, the corresponding air flow effects are different, and the circumferential diffusion speed of the cold air is different. If the bearing speed is fast and the amount of cold air delivered is large, the cold air will quickly diffuse circumferentially to form a closed loop. At this time, the heat on the bearing will gradually transfer to the cold air, so that the boundary between the bearing and the cold air is gradually blurred. In order to facilitate the distinction between the bearing and the cold air, the cold air trajectory is identified. It is best to collect a thermal image before the boundary between the bearing and the cold air is blurred, but this will result in a small number of collected thermal images, and the collected thermal images may not fully reflect the vibration characteristics of the bearing. Therefore, the present invention proposes to determine the amount of cold air delivered to the peripheral area of the bearing according to the bearing speed, and deliver a smaller amount of cold air when the bearing speed is fast, and deliver a larger amount of cold air when the bearing speed is slow.
[0042] In order to ensure that enough thermal images are collected, the collection time of the infrared thermal imager can be set to ensure that within the set collection time, the bearings with different speeds can drive the cold air to diffuse to form a closed loop. Figure 2 As shown, the present invention may also include a speed sensor for detecting the speed of the bearing, and the controller is connected to the speed sensor. For bearings with different speeds, the controller locally stores the amount of cold air required to be provided for the bearing to be operated normally at the speed starting from the moment of cold air delivery, when the rotation time reaches the set acquisition time of the infrared thermal imager, and the cold air just circumferentially surrounds the bearing. The controller determines the amount of cold air delivered by the cold air device according to the detected bearing speed; determines the delivery speed of the cold air according to the determined amount of cold air and the set acquisition time of the infrared thermal imager; determines the temperature of the cold air according to the temperature resolution of the infrared thermal imager and the detected bearing temperature, so that the infrared thermal imager can distinguish the boundary between the bearing and the cold air when the cold air just circumferentially surrounds the bearing; the controller controls the cold air device to deliver the determined corresponding amount and corresponding temperature of cold air to the surrounding area of the bearing through the air duct at the set pressure and the determined delivery speed.
[0043] The present invention determines the amount of cold air delivered to the surrounding area of the bearing according to the bearing rotation speed, so that the time taken for the cold air to diffuse and form a closed loop when the bearing rotates at different speeds is the same. In this way, the number of thermal images collected by the infrared thermal imager within this time is also the same and large. After the thermal images are aligned and overlapped, the vibration changes of bearings with different rotation speeds within the same time can be reflected. It can be seen that even if the bearing rotation speeds are different, more thermal images can be aligned and overlapped to fully reflect the vibration characteristics of the bearing.
[0044] It can be seen from the above embodiments that the present invention delivers cold air to the peripheral area of the bearing and determines whether the bearing has eccentric rotation and whether vibration occurs based on the trajectory formed by the cold air as the bearing rotates. The method is simple and can determine the specific fault that causes the bearing to overheat.
[0045] In addition, the present invention also provides a diagnostic method for the above-mentioned motor fault intelligent diagnostic system, which may include the following steps:
[0046] Step S100, the controller determines whether the detected bearing temperature is greater than the set temperature. If so, it means that the bearing is overheated, and step S200 is executed. Otherwise, it returns to step S100.
[0047] Step S200: The controller controls the cold air device to set the pressure and the corresponding delivery speed, and delivers the cold air of the corresponding amount and temperature to the surrounding area of the bearing.
[0048] In step S200, for bearings with different rotation speeds, the controller locally stores the amount of cold air required to circumferentially surround the bearing when the rotation time of the bearing operating normally at the rotation speed reaches the set acquisition time of the infrared thermal imager starting from the cold air delivery moment;
[0049] The step S200 specifically includes: the controller determines the amount of cold air Q1 delivered by the cold air device according to the detected bearing rotation speed; determines the delivery speed V1 of the cold air according to the determined cold air amount Q1 and the set acquisition time of the infrared thermal imager; determines the temperature T of the cold air according to the temperature resolution of the infrared thermal imager and the detected bearing temperature, so that the infrared thermal imager can distinguish the boundary between the bearing and the cold air when the cold air just circumferentially surrounds the bearing; the controller controls the cold air device to deliver the determined corresponding amount Q1 and corresponding temperature T to the surrounding area of the bearing through the air duct at the set pressure and the determined delivery speed V1.
[0050] Step S300, the controller controls the infrared thermal imager to collect thermal images of the bearing and the surrounding area of the bearing within a set collection time, to obtain multiple thermal images;
[0051] Step S400: The processor aligns and overlaps the multiple thermal images collected continuously to obtain a cold air trajectory, and determines whether the bearing has eccentric rotation and whether the bearing has vibration according to the cold air trajectory.
[0052] In this embodiment, the step S400 may further include: when the bearing vibrates, determining the vibration characteristics according to the cold air trajectory, and determining the specific fault causing the bearing overheating according to the vibration characteristics.
[0053] The step S400 may specifically include:
[0054] Step S410: The processor aligns and overlaps the multiple thermal images collected continuously to obtain a cold air trajectory, and determines the inscribed circles corresponding to the majority of cold air arc segments in the cold air trajectory.
[0055] Step S420, determine whether the maximum value of the distance between each adjacent cold air arc segment in the inscribed circle is greater than the corresponding distance. If so, it means that the cold air does not circumferentially surround the bearing, and the cold air cannot fully reflect the vibration characteristics of the bearing, and execute step S430; otherwise, it means that the cold air circumferentially surrounds the bearing, and the cold air can fully reflect the vibration characteristics of the bearing, and execute step S440; the corresponding distance in step S420 is determined by the rotational speed of the bearing and the acquisition rate of the infrared thermal imager.
[0056] Step S430, sending a command to increase the amount of cold air to the controller, so that after receiving the command, the controller first determines the current increased amount of cold air Q2 to be delivered, determines the delivery speed V2 of the cold air according to the determined cold air amount Q2 and the set acquisition time of the infrared thermal imager, and then controls the cold air device to deliver the determined corresponding amount Q2 and the corresponding temperature T to the surrounding area of the bearing at the set pressure and the determined delivery speed V2; and controls the infrared thermal imaging image to collect thermal images of the bearing and the surrounding area of the bearing within its set acquisition time, obtains multiple thermal images, increases the cold air amount Q2 step by step, and returns to execute step S410.
[0057] Step S440, align and overlap the multiple thermal images collected continuously to obtain the cold air trajectory, and determine whether there is at least one cold air arc segment in the cold air trajectory with the corresponding end bent outward. If so, it indicates that the bearing vibrates. According to the cold air arc segment with the corresponding end bent outward, the vibration direction and vibration amplitude of the bearing are determined. According to the vibration direction and vibration amplitude, the specific fault that caused the bearing overheating is determined, and step S450 is executed. Otherwise, it indicates that the bearing does not vibrate, and step S450 is executed.
[0058] Step S450, determine the inscribed circle corresponding to the majority of cold air arc segments in the cold air trajectory; determine whether the center of the inscribed circle deviates from the expected center. If so, it indicates that the bearing has eccentric rotation. According to the positional relationship between the center of the inscribed circle and the expected center, determine the eccentricity of the bearing. Otherwise, it indicates that the bearing has not eccentric rotation.
[0059] As can be seen from the above embodiments, the present invention delivers cold air to the peripheral area of the bearing, and determines whether the bearing has eccentric rotation and vibration according to the trajectory formed by the cold air as the bearing rotates. The method is simple and can determine the specific fault that causes the bearing to overheat. In addition, in the case where the thermal imaging image is acquired but the cold air does not circumferentially surround the bearing, the present invention controls the cold air device to continue to increase the supply of cold air to the peripheral area of the bearing, which can ensure that the cold air can always circumferentially surround the bearing, so that the cold air trajectory fully reflects the vibration characteristics of the bearing.
[0060] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.
[0061] It will be appreciated that the invention is not limited to the precise construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from its scope. The scope of the invention is governed solely by the appended claims.
Claims
1. An intelligent motor fault diagnosis system, characterized in that: It comprises a cooling device, an air duct and an infrared thermal imager, wherein the cooling device is arranged outside the motor housing, and is connected to the peripheral area of the bearing through the air duct, and the outlet of the air duct is arranged in the radial direction of the bearing, and the infrared thermal imager faces the rotating shaft section of the bearing; the peripheral area of the bearing is the area between the bearing and the motor housing; When the bearing is overheated, the cooling air device radially delivers cooling air to the peripheral area of the bearing through the air duct, and the infrared thermal imager collects thermal images of the bearing and the peripheral area of the bearing; based on the cold air trajectory in the thermal image, it is determined whether the bearing has eccentric rotation and whether the bearing has vibration.
2. The motor fault intelligent diagnosis system according to claim 1 is characterized in that: When the bearing vibrates, the vibration characteristics are determined based on the cold air trajectory, and the specific fault causing the bearing overheating is determined based on the vibration characteristics.
3. The motor fault intelligent diagnosis system according to claim 1 or 2, characterized in that: It also includes a controller, a processor, and a temperature measuring device for detecting the bearing temperature. The controller is connected to the temperature measuring device, the cold air device, and the infrared thermal imager, respectively. When it is determined that the bearing temperature exceeds the set temperature and the bearing is overheated, the cold air device is controlled to deliver cold air of a corresponding amount and temperature to the surrounding area of the bearing through the air duct at a set pressure and a corresponding delivery speed according to the bearing temperature, and the infrared thermal imager is started to collect thermal images of the bearing and the surrounding area of the bearing; The processor is connected to the infrared thermal imager, and identifies the cold wind track in the thermal image according to a plurality of continuous thermal images collected by the infrared thermal imager, so as to determine whether the bearing has eccentric rotation and whether the bearing has vibration.
4. The motor fault intelligent diagnosis system according to claim 3 is characterized in that: It also includes a speed sensor for detecting the speed of the bearing. The controller is connected to the speed sensor. For bearings with different speeds, the controller locally stores the amount of cold air required to circumferentially surround the bearing when the rotation time of the bearing that is operating normally at the speed reaches the set acquisition time of the infrared thermal imager starting from the moment of cold air delivery. The controller determines the amount of cold air delivered by the cold air device according to the detected bearing rotation speed; determines the delivery speed of the cold air according to the determined amount of cold air and the set acquisition time of the infrared thermal imager; determines the temperature of the cold air according to the temperature resolution of the infrared thermal imager and the detected bearing temperature, so that the infrared thermal imager can distinguish the boundary between the bearing and the cold air when the cold air just circumferentially surrounds the bearing; the controller controls the cold air device to deliver the cold air of the determined corresponding amount and temperature to the surrounding area of the bearing through the air duct at the set pressure and the determined delivery speed; The controller controls the infrared thermal imager to start, so that it collects thermal images of the bearing and the surrounding area of the bearing within a set collection time.
5. The motor fault intelligent diagnosis system according to claim 1, characterized in that: There are multiple air guide pipes distributed circumferentially around the bearing.
6. A diagnostic method for a motor fault intelligent diagnostic system according to any one of claims 1 to 5, characterized in that: include: Step S100, the controller determines whether the detected bearing temperature is greater than the set temperature. If so, it means that the bearing is overheated, and step S200 is executed. Otherwise, the controller returns to step S100. Step S200, the controller controls the cold air device to set the pressure and the corresponding delivery speed, and delivers the cold air of the corresponding amount and the corresponding temperature to the surrounding area of the bearing; Step S300, the controller controls the infrared thermal imager to collect thermal images of the bearing and the surrounding area of the bearing within a set collection time, to obtain multiple thermal images; Step S400: The processor aligns and overlaps the multiple thermal images collected continuously to obtain a cold air trajectory, and determines whether the bearing has eccentric rotation and whether the bearing has vibration according to the cold air trajectory.
7. The method according to claim 6, characterized in that In step S200, for bearings with different rotation speeds, the controller locally stores the amount of cold air required to circumferentially surround the bearing when the rotation time of the bearing operating normally at the rotation speed reaches the set acquisition time of the infrared thermal imager starting from the cold air delivery moment; The step S200 specifically includes: the controller determines the amount of cold air Q1 delivered by the cold air device according to the detected bearing rotation speed; determines the delivery speed V1 of the cold air according to the determined amount of cold air Q1 and the set acquisition time of the infrared thermal imager; determines the temperature T of the cold air according to the temperature resolution of the infrared thermal imager and the detected bearing temperature, so that the infrared thermal imager can distinguish the boundary between the bearing and the cold air when the cold air just circumferentially surrounds the bearing; The controller controls the cold air device to deliver cold air of a determined corresponding amount Q1 and a corresponding temperature T to the surrounding area of the bearing through the air duct at a set pressure and a determined delivery speed V1.
8. The method according to claim 6, characterized in that The step S400 further includes: when the bearing vibrates, determining the vibration characteristics according to the cold air trajectory, and determining the specific fault causing the bearing overheating according to the vibration characteristics.
9. The method according to claim 8, characterized in that The step S400 specifically includes: Step S410: The processor aligns and overlaps the multiple continuously collected thermal images to obtain a cold air trajectory, and determines the inscribed circles corresponding to the majority of cold air arc segments in the cold air trajectory; Step S420, determining whether the maximum value of the distance between each adjacent cold air arc segment in the inscribed circle is greater than the corresponding distance, if so, it means that the cold air does not circumferentially surround the bearing, and the cold air cannot fully reflect the vibration characteristics of the bearing, and executing step S430; otherwise, it means that the cold air circumferentially surrounds the bearing, and the cold air can fully reflect the vibration characteristics of the bearing, and executing step S440; Step S430, sending a command to increase the amount of cold air to the controller, so that after receiving the command, the controller first determines the current increased amount of cold air Q2 to be delivered, determines the delivery speed V2 of the cold air according to the determined cold air amount Q2 and the set acquisition time of the infrared thermal imager, and then controls the cold air device to deliver the cold air of the determined corresponding amount Q2 and the corresponding temperature T to the surrounding area of the bearing at the set pressure and the determined delivery speed V2; and controls the infrared thermal imaging image to collect thermal images of the bearing and the surrounding area of the bearing within its set acquisition time, obtains multiple thermal images, increases the cold air amount Q2 step by step, and returns to execute step S410; Step S440, align and overlap the multiple thermal images collected continuously to obtain a cold wind trajectory, and determine whether there is a situation in which the corresponding end of at least one cold wind arc segment in the cold wind trajectory is bent outward. If so, it indicates that the bearing vibrates, and the vibration direction and vibration amplitude of the bearing are determined according to the cold wind arc segment with the corresponding end bent outward. The specific fault causing the overheating of the bearing is determined according to the vibration direction and vibration amplitude, and step S450 is executed. Otherwise, it indicates that the bearing does not vibrate, and step S450 is executed; Step S450, determine the inscribed circle corresponding to the majority of cold air arc segments in the cold air trajectory; determine whether the center of the inscribed circle deviates from the expected center. If so, it indicates that the bearing has eccentric rotation. According to the positional relationship between the center of the inscribed circle and the expected center, determine the eccentricity of the bearing. Otherwise, it indicates that the bearing has not eccentric rotation.
10. The method according to claim 9, characterized in that The corresponding distance in step S420 is determined by the rotation speed of the bearing and the acquisition rate of the infrared thermal imager.