Bearing seat safety protection system, motor test bench and test bench test method

Abstract

The invention relates to a bearing seat safety protection system, a motor test bench and a test bench test method, a cooperative monitoring structure is formed by arranging a torque sensor, a temperature sensor, a vibration detection assembly and a control unit, and the torque sensor is assembled on a bearing seat to monitor the torque and the rotating speed of the bearing seat; the temperature sensor is assembled on the bearing seat to monitor the operating temperature state of an inner bearing outer ring of the bearing seat, the vibration detection assembly is assembled on the bearing seat to detect the vibration characteristic of the bearing seat, and the control unit is connected with the torque sensor, the temperature sensor and the vibration detection assembly. Therefore, the torque sensor, the temperature sensor and the vibration detection assembly can synchronously transmit relevant information of the torque, the rotating speed, the running temperature state of the inner bearing outer ring and the vibration characteristic of the bearing seat monitored by the torque sensor, the temperature sensor and the vibration detection assembly to the control unit, and comprehensive capturing of the running state of the bearing seat is achieved through multi-parameter cooperative monitoring. And the abnormal state of the bearing seat can be identified in time to adapt to the test requirement of the ultra-high-speed motor.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobile parts testing, in particular to a bearing seat safety protection system, a motor test bench and a test bench testing method. BACKGROUND

[0002] At present, low-carbon environmental protection has become the core development trend of the automobile industry, and the new energy automobile industry has therefore been vigorously supported and promoted by the country. As a core component of the powertrain of new energy vehicles, the motor is generally used to reduce the size of the motor under the premise of ensuring power by increasing the speed to meet the power demand, and the research and development of super-speed motors has become a mainstream trend in the field of new energy vehicles. This trend puts higher requirements on the super-speed motor test bench, especially the bearing seat for the test bench, which needs to have higher limit speed and reliability. Once there is an abnormality such as installation eccentricity, the heat generation will increase geometrically, directly shortening the service life of the bearing seat and even the entire test bench.

[0003] In related technologies, the motor test bench cannot timely identify the abnormal state of the bearing seat when testing a super-speed motor, and cannot meet the testing demand of high-speed motors. SUMMARY

[0004] The present application provides a bearing seat safety protection system, a motor test bench and a test bench testing method, which can solve the technical problem that the conventional motor test bench cannot timely identify the abnormal state of the bearing seat when testing a super-speed motor, and cannot meet the testing demand of high-speed motors.

[0005] In a first aspect, the embodiments of the present application provide a bearing seat safety protection system, which comprises: a torque sensor, which is used to be assembled on the bearing seat and is used to monitor the torque and speed of the bearing seat; a temperature sensor, which is used to be assembled on the bearing seat and is used to monitor the running temperature state of the outer ring of the inner bearing of the bearing seat; a vibration detection assembly, which is assembled on the bearing seat and is used to detect the vibration characteristics of the bearing seat; a control unit connected with the torque sensor, the temperature sensor and the vibration detection assembly.

[0006] In combination with the first aspect, in an implementation manner, the vibration detection assembly comprises: three vibration sensors, the three vibration sensors are respectively used to be assembled on the bearing seat in X, Y and Z directions, and are respectively used to monitor the vibration characteristics of the bearing seat in the corresponding direction; wherein, the X direction is a radial horizontal direction, the Y direction is an axial direction, and the Z direction is a radial vertical direction; the vibration sensors are connected with the control unit.

[0007] In combination with the first aspect, in an implementation, the bearing seat safety protection system further comprises: a shaft center position detection assembly, which is configured to be assembled in the bearing seat and configured to monitor the shaft center position offset of the input shaft and the output shaft of the bearing seat; the shaft center position detection assembly is connected with the control unit.

[0008] In combination with the first aspect, in an implementation, the shaft center position detection assembly comprises: four proximity sensors, the four proximity sensors are divided into two groups, one group is configured to be assembled in the input shaft of the bearing seat, and the other group is configured to be assembled in the output shaft of the bearing seat; the two proximity sensors in each group are arranged at an interval of 90° in a radial plane centered on the corresponding shaft center line, and the detection end of the proximity sensor is configured to maintain a predetermined gap with the outer surface of the corresponding shaft; the proximity sensors are connected with the control unit.

[0009] The second aspect provides a motor test bench, comprising: a test motor; a dynamometer; a bearing seat, an input end of the bearing seat is connected in transmission with the test motor through a spline shaft, and an output end of the bearing seat is connected in transmission with the dynamometer through a shaft coupling; a bearing seat safety protection system, a torque sensor, a temperature sensor and a vibration detection assembly of the safety protection system are respectively assembled in the bearing seat, and a control unit of the safety protection system is configured to determine the working state of the bearing seat and execute corresponding protection actions according to the monitoring data of each sensor and the vibration detection assembly.

[0010] The third aspect provides a motor test bench test method based on the bearing seat safety protection system as described in some embodiments above, comprising the following steps: setting a rotation speed threshold value, a shaft center offset threshold value, a vibration threshold value, a temperature threshold value and a torque safety threshold value according to the rated parameters of the test motor; after starting the test motor, the control unit synchronously receives the torque and rotation speed data of the torque sensor, the bearing outer ring temperature data of the temperature sensor, the three-direction vibration data of the vibration detection assembly and the shaft center offset data of the shaft center position detection assembly; the control unit determines the rotation speed, the shaft center state, the vibration state and the temperature state to determine the working state of the motor test bench.

[0011] In combination with the third aspect, in an implementation, the determining the working state of the motor test bench by the control unit to determine the rotating speed, the shaft center state, the vibration state and the temperature state comprises: If the rotating speed data is less than the rotating speed threshold value and the shaft center offset data is greater than the shaft center offset threshold value, it is determined that the test motor or the bearing seat is installed eccentrically, and the centering of the test motor and the bearing seat needs to be checked.

[0012] In combination with the third aspect, in an implementation, the determining the working state of the motor test bench by the control unit to determine the rotating speed, the shaft center state, the vibration state and the temperature state comprises: If the rotating speed data is greater than the rotating speed threshold value and the shaft center offset data is greater than the shaft center offset threshold value, it is determined that the test motor vibrates greatly and works abnormally, and the test accessory needs to be checked.

[0013] In combination with the third aspect, in an implementation, the determining the working state of the motor test bench by the control unit to determine the rotating speed, the shaft center state, the vibration state and the temperature state comprises: If the rotating speed data is greater than the rotating speed threshold value, the shaft center offset data is less than the shaft center offset threshold value, and the vibration displacement data is greater than the vibration displacement threshold value, it is determined that the bearing of the input shaft left or the output shaft of the bearing seat is abnormal, and the bearing needs to be replaced.

[0014] In combination with the third aspect, in an implementation, the determining the working state of the motor test bench by the control unit to determine the rotating speed, the shaft center state, the vibration state and the temperature state comprises: If the rotating speed data is greater than the rotating speed threshold value, the shaft center offset data is less than the shaft center offset threshold value, the vibration displacement data is less than the vibration displacement threshold value, and the temperature data is less than the temperature threshold value, it is determined that the motor test bench works normally. If the rotating speed data is greater than the rotating speed threshold value, the shaft center offset data is less than the shaft center offset threshold value, the vibration displacement data is less than the vibration displacement threshold value, and the temperature data is greater than the temperature threshold value, it is determined that the bearing of the input shaft left or the output shaft of the bearing seat is abnormally lubricated, and the forced cooling flow needs to be increased.

[0015] The technical scheme provided by the embodiments has the beneficial effects that: The torque sensor is arranged on the bearing seat to monitor the torque and rotating speed of the bearing seat, the temperature sensor is arranged on the bearing seat to monitor the running temperature state of the inner bearing outer ring of the bearing seat, the vibration detection component is arranged on the bearing seat to detect the vibration characteristics of the bearing seat, and the control unit is connected with the torque sensor, the temperature sensor and the vibration detection component respectively, so that the torque sensor, the temperature sensor and the vibration detection component can synchronously transmit the torque, the rotating speed, the inner bearing outer ring running temperature state and the vibration characteristics related information of the bearing seat monitored by each to the control unit, the overall capture of the running state of the bearing seat is realized through the multi-parameter cooperative monitoring, and then the abnormal state of the bearing seat is timely identified to adapt to the test requirement of the super-speed motor. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 It is a structural schematic diagram of the motor test bench in the embodiments of the present application. Figure 2 It is a top view structural schematic diagram of the bearing seat in the embodiments of the present application. Figure 3 It is a flowchart of the test method of the motor test bench in the embodiments of the present application.

[0018] In the figure: 1, test motor; 2, spline shaft; 3, bearing seat; 4, shaft coupling; 5, dynamometer; 6, torque sensor; 7, temperature sensor; 8, vibration sensor; 9, proximity sensor. DETAILED DESCRIPTION In order to make the personnel in the technical field better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0019] The bearing seat safety protection system, the motor test bench and the test bench test method provided in the embodiments of the present application can solve the technical problem that the conventional motor test bench cannot timely identify the abnormal state of the bearing seat when testing the super-speed motor, and cannot meet the test requirement of the high-speed motor.

[0020] Firstly, Figure 1 and Figure 2 As shown, this application embodiment provides a bearing housing safety protection system, which includes: a torque sensor 6, which is mounted on the bearing housing 3 and used to monitor the torque and rotational speed of the bearing housing 3; a temperature sensor 7, which is mounted on the bearing housing 3 and used to monitor the operating temperature state of the inner bearing outer ring of the bearing housing 3; a vibration detection component, which is mounted on the bearing housing 3 and used to detect the vibration characteristics of the bearing housing 3; and a control unit, which is connected to the torque sensor 6, the temperature sensor 7 and the vibration detection component.

[0021] In this embodiment, a collaborative monitoring structure is formed by setting up a torque sensor 6, a temperature sensor 7, a vibration detection component, and a control unit. The torque sensor 6 is mounted on the bearing housing 3 to monitor the torque and speed of the bearing housing 3. The temperature sensor 7 is mounted on the bearing housing 3 to monitor the operating temperature of the inner bearing outer ring of the bearing housing 3. The vibration detection component is mounted on the bearing housing 3 to detect the vibration characteristics of the bearing housing 3. The control unit is connected to the torque sensor 6, the temperature sensor 7, and the vibration detection component respectively, so that the torque sensor 6, the temperature sensor 7, and the vibration detection component can synchronously transmit the relevant information of the torque, speed, inner bearing outer ring operating temperature, and vibration characteristics of the bearing housing 3 monitored by each to the control unit. Through multi-parameter collaborative monitoring, the operating status of the bearing housing 3 is fully captured, and abnormal states of the bearing housing 3 can be identified in a timely manner to meet the testing requirements of ultra-high speed motors.

[0022] In conjunction with the first aspect, in one embodiment, the vibration detection assembly includes: three vibration sensors 8, which are respectively mounted on the bearing housing 3 in the X, Y and Z directions, and are respectively used to monitor the vibration characteristics of the bearing housing 3 in the corresponding directions; wherein, the X direction is the radial horizontal direction, the Y direction is the axial direction, and the Z direction is the radial vertical direction; the vibration sensors 8 are connected to the control unit.

[0023] In this embodiment, the vibration detection component specifically includes three vibration sensors 8, which are respectively mounted on the bearing housing 3 in the X, Y, and Z directions. The X direction is the radial horizontal direction, the Y direction is the axial direction, and the Z direction is the radial vertical direction. The three vibration sensors 8 are used to monitor the vibration characteristics of the bearing housing 3 in the corresponding X, Y, and Z directions. At the same time, the vibration sensors 8 are connected to the control unit. By mounting the three vibration sensors 8 on the bearing housing 3 in the X, Y, and Z directions, the vibration characteristics of the bearing housing 3 in the radial horizontal, axial, and radial vertical dimensions can be monitored separately. The vibration sensors 8 can transmit the monitored vibration characteristic information in each direction to the control unit. This information, together with the torque and speed of the bearing housing 3 monitored by the torque sensor 6 and the operating temperature state of the outer ring of the bearing housing 3 monitored by the temperature sensor 7, allows the control unit to comprehensively obtain multi-dimensional operating parameters of the bearing housing 3, thereby more accurately capturing vibration anomalies of the bearing housing 3 and adapting to the refined requirements of ultra-high speed motor testing for bearing housing 3 condition monitoring.

[0024] In conjunction with the first aspect, in one embodiment, the bearing housing safety protection system further includes: a shaft center position detection component, which is used to be assembled on the bearing housing 3 and to monitor the shaft center position offset of the input shaft and output shaft of the bearing housing 3; the shaft center position detection component is connected to the control unit.

[0025] In this embodiment, the bearing housing safety protection system also includes a shaft center position detection component. This component is mounted on the bearing housing 3 and is used to monitor the shaft center position offset of the input and output shafts of the bearing housing 3. The shaft center position detection component is also connected to the control unit. This configuration allows the shaft center position detection component to transmit the monitored shaft center position offset information of the input and output shafts of the bearing housing 3 to the control unit. This, combined with the torque and speed of the bearing housing 3 monitored by the torque sensor 6, the operating temperature of the inner bearing outer ring of the bearing housing 3 monitored by the temperature sensor 7, and the vibration characteristics of the bearing housing 3 monitored by the vibration detection component, enables the control unit to simultaneously acquire the torque, speed, operating temperature of the inner bearing outer ring, vibration characteristics, and shaft center position offset information of the bearing housing 3. This achieves multi-dimensional and comprehensive monitoring of the operating status of the bearing housing 3, thereby promptly identifying abnormal states caused by shaft center position offset, to meet the testing requirements of ultra-high-speed motors.

[0026] In conjunction with the first aspect, in one embodiment, the shaft position detection assembly includes: four proximity sensors 9, which are divided into two groups, one group for mounting on the input shaft of the bearing housing 3 and the other group for mounting on the output shaft of the bearing housing 3; the two proximity sensors 9 in each group are arranged at a 90° angle interval in a radial plane centered on the axis of the corresponding shaft, and the detection end of the proximity sensor 9 is used to maintain a preset gap with the outer circular surface of the corresponding shaft; the proximity sensors 9 are connected to the control unit.

[0027] In this embodiment, the shaft center position detection component specifically includes four proximity sensors 9. These four proximity sensors 9 are divided into two groups: one group is used to assemble the input shaft of the bearing housing 3, and the other group is used to assemble the output shaft of the bearing housing 3. The two proximity sensors 9 in each group are arranged at a 90° angle interval in a radial plane centered on the corresponding shaft centerline. The detection end of the proximity sensor 9 maintains a preset gap with the outer surface of the corresponding shaft. Simultaneously, the proximity sensors 9 are connected to the control unit. By assembling the four proximity sensors 9 in two groups corresponding to the input and output shafts of the bearing housing 3, and arranging each group of proximity sensors 9 at a 90° angle interval in the radial plane of the corresponding shaft, the input shaft and output shaft position detection component can be detected. The output shaft's center position is monitored from multiple angles. The preset clearance setting ensures the accuracy of the proximity sensor 9 in detecting shaft center position deviations. The proximity sensor 9 can also transmit the monitored input and output shaft center position information to the control unit. This information works in conjunction with the torque and speed of the bearing housing 3 monitored by the torque sensor 6, the operating temperature of the inner bearing outer ring of the bearing housing 3 monitored by the temperature sensor 7, and the X, Y, and Z-direction vibration characteristics of the bearing housing 3 monitored by the vibration sensor 8 in the vibration detection assembly. This allows the control unit to simultaneously acquire multi-dimensional operating parameters of the bearing housing 3, thereby accurately capturing abnormal shaft center position deviations of the input and output shafts. This meets the high accuracy requirements of ultra-high speed motor testing for monitoring the condition of the bearing housing 3.

[0028] In conjunction with the first aspect, in one embodiment, the torque sensor 6 is mounted on the front end of the bearing housing 3, and the input end of the torque sensor 6 is drivenly connected to the splined shaft 2 connecting the tested motor 1 and the bearing housing 3, and the output end of the torque sensor 6 is drivenly connected to the input shaft of the bearing housing 3, thereby realizing real-time monitoring of torque and speed data during the operation of the bearing housing 3; the temperature sensor 7 is mounted on the side of the bearing housing 3, and the detection end of the temperature sensor 7 extends into the interior of the bearing housing 3, directly facing and contacting (or fitting) the outer ring of the inner bearing of the bearing housing 3, thereby accurately monitoring the operating temperature status of the outer ring of the inner bearing of the bearing housing 3.

[0029] Secondly, embodiments of this application provide a motor test bench, which includes: a test motor 1; Dynamometer 5; bearing housing 3, the input end of which is connected to the tested motor 1 via a splined shaft 2, and the output end of which is connected to the dynamometer 5 via a coupling 4; bearing housing safety protection system, wherein the torque sensor 6, temperature sensor 7, and vibration detection component of the safety protection system are respectively mounted on the bearing housing 3, and the control unit of the safety protection system is used to determine the working status of the bearing housing 3 and execute corresponding protection actions based on the monitoring data of each sensor and vibration detection component.

[0030] In this embodiment, the motor test bench provided by this application includes a test motor 1, a dynamometer 5, a bearing housing 3, and the aforementioned bearing housing safety protection system of the first aspect. The input end of the bearing housing 3 is connected to the test motor 1 via a splined shaft 2, and the output end of the bearing housing 3 is connected to the dynamometer 5 via a coupling 4, realizing the power transmission between the test motor 1 and the dynamometer 5. The torque sensor 6, temperature sensor 7, and vibration detection component of the bearing housing safety protection system are respectively mounted on the bearing housing 3. The torque sensor 6 is used to monitor the torque and speed of the bearing housing 3, the temperature sensor 7 is used to monitor the operating temperature of the inner bearing outer ring of the bearing housing 3, and the vibration detection component is used to detect the vibration characteristics of the bearing housing 3. The control unit of the safety protection system is connected to the torque sensor 6, temperature sensor 7, and vibration detection component, and can receive the monitoring data transmitted by each sensor and vibration detection component. By analyzing the monitoring data, the working state of the bearing housing 3 is determined, and the corresponding protection action is executed according to the determination result, thereby timely identifying the abnormal state of the bearing housing 3 and adapting to the testing requirements of ultra-high speed motors.

[0031] Thirdly, embodiments of this application provide a test method for a motor test bench based on the bearing housing safety protection system described in some of the above embodiments, which includes the following steps: S100: Based on the rated parameters of the tested motor 1, set the speed threshold, shaft offset threshold, vibration threshold, temperature threshold, and torque safety threshold. S200: After starting the test motor 1, the control unit synchronously receives torque and speed data from torque sensor 6, bearing outer ring temperature data from temperature sensor 7, three-directional vibration data from vibration detection component, and shaft offset data from shaft position detection component. S300: The control unit determines the working status of the motor test bench by judging the rotational speed, shaft center status, vibration status, and temperature status.

[0032] In this embodiment, based on the rated parameters of the tested motor 1, speed threshold, shaft offset threshold, vibration threshold, temperature threshold, and torque safety threshold are set. After the tested motor 1 is started, the control unit synchronously receives torque and speed data from torque sensor 6, bearing outer ring temperature data from temperature sensor 7, three-directional vibration data from vibration detection component, and shaft offset data from shaft position detection component. Based on the speed threshold, shaft offset threshold, vibration threshold, and temperature threshold set in S100, the control unit performs speed determination on the speed data from torque sensor 6 received in S200, shaft position determination on the shaft offset data from shaft position detection component, vibration determination on the three-directional vibration data from vibration detection component, and temperature determination on the bearing outer ring temperature data from temperature sensor 7, thereby determining the working state of the motor test bench.

[0033] In conjunction with the third aspect, in one implementation, S300 includes the following steps: S301: If the speed data is less than the set speed threshold and the shaft offset data is greater than the set shaft offset threshold, it is determined that the tested motor 1 or bearing housing 3 is misaligned, and the alignment of the tested motor 1 and bearing housing 3 needs to be checked.

[0034] In this embodiment, S301 uses the control unit to compare the rotational speed data monitored by the torque sensor 6 with a set rotational speed threshold, and the shaft offset data monitored by the shaft position detection component with a set shaft offset threshold. When it is determined that the rotational speed data is less than the set rotational speed threshold and the shaft offset data is greater than the set shaft offset threshold, the root cause of the abnormality can be accurately located as the installation misalignment of the test motor 1 or the bearing housing 3, and the alignment check of the test motor 1 and the bearing housing 3 is clearly indicated. This avoids the problem that traditional ultra-high speed motor test benches, in low-speed scenarios, may misjudge other faults such as vibration abnormalities or lubrication problems due to only monitoring shaft offset or failing to combine rotational speed dimensions to distinguish fault types, resulting in ineffective troubleshooting and extended abnormality handling cycles. Based on this determination result, the staff can directly check the alignment of the test motor 1 and the bearing housing 3, shortening the time spent on abnormality troubleshooting and handling, ensuring accurate control of the bearing housing 3 installation status at low speeds, laying the foundation for the stable progress of subsequent ultra-high speed motor testing, and meeting the requirements of ultra-high speed motor testing for accurate status monitoring and efficient fault location.

[0035] In conjunction with the third aspect, in one implementation, S300 includes the following steps: S302: If the speed data is determined to be greater than the set speed threshold, and the shaft offset data is greater than the set shaft offset threshold, then the tested motor 1 is determined to have large vibration and abnormal operation, and the test piece needs to be checked.

[0036] In this embodiment, the control unit compares the rotational speed data monitored by the torque sensor 6 with a set rotational speed threshold, and the shaft offset data monitored by the shaft position detection component with a set shaft offset threshold. When it is determined that the rotational speed data is greater than the set rotational speed threshold and the shaft offset data is greater than the set shaft offset threshold, the root cause of the abnormality can be accurately located as large vibration and abnormal operation of the tested motor 1, pointing to the need for inspection of the test piece. This avoids the problem of traditional ultra-high speed motor test benches misjudging installation misalignment or other faults and prolonging the abnormality investigation cycle because they only monitor a single parameter or cannot distinguish the cause of shaft offset in high-speed scenarios. Based on the judgment result, the staff can directly inspect the test piece, shorten the time spent on abnormality handling, ensure the stability of the test bench during the ultra-high speed motor test, and ensure the efficient progress of the test process to meet the testing requirements of ultra-high speed motors.

[0037] In conjunction with the third aspect, in one implementation, S300 includes the following steps: S303: If the rotational speed data is greater than the set rotational speed threshold, the shaft offset data is less than the set shaft offset threshold, and the vibration displacement data is greater than the set vibration displacement threshold, then the bearing on the left input shaft or the output shaft of bearing housing 3 is determined to be abnormal and the bearing needs to be replaced.

[0038] In this embodiment, S303 uses the control unit to perform multi-parameter collaborative comparisons of the rotational speed data monitored by the torque sensor 6 with a set rotational speed threshold, the shaft offset data monitored by the shaft position detection component with a set shaft offset threshold, and the vibration displacement data monitored by the vibration detection component with a set vibration displacement threshold. When it is determined that the rotational speed data is greater than the set rotational speed threshold, the shaft offset data is less than the set shaft offset threshold, and the vibration displacement data is greater than the set vibration displacement threshold, the root cause of the abnormality can be accurately located as a bearing abnormality on the left side of the input shaft or the output shaft of the bearing housing 3, clearly indicating the need for bearing replacement; this avoids the need for traditional ultra-high speed motor test benches. In high-speed scenarios, relying solely on vibration monitoring or failing to consider speed and shaft offset dimensions to eliminate other fault interference can lead to misdiagnosis as non-bearing issues such as installation misalignment or motor body abnormalities. This results in ineffective repairs and delays in testing. Based on this assessment, staff can directly replace the bearings on the left input shaft or output shaft of bearing housing 3, significantly reducing the time spent on fault diagnosis and handling. This ensures that the impact of bearing abnormalities on testing can be eliminated in a timely manner during high-speed phases, guaranteeing the reliability of the test bench during ultra-high-speed motor testing and meeting the requirements of ultra-high-speed motor testing for accurate fault location and continuous testing.

[0039] In conjunction with the third aspect, in one implementation, S300 includes the following steps: S304: If the speed data is determined to be greater than the set speed threshold, the shaft offset data is less than the set shaft offset threshold, the vibration displacement data is less than the set vibration displacement threshold, and the temperature data is less than the set temperature threshold, then the motor test bench is determined to be working normally. S305: If the rotational speed data is greater than the set rotational speed threshold, the shaft offset data is less than the set shaft offset threshold, the vibration displacement data is less than the set vibration displacement threshold, and the temperature data is greater than the set temperature threshold, then the bearing lubrication of the left input shaft or the output shaft of bearing housing 3 is abnormal, and the forced cooling flow rate needs to be increased.

[0040] In this embodiment, S304 uses the control unit to perform multi-dimensional collaborative comparisons of the rotational speed data monitored by the torque sensor 6 with the set rotational speed threshold, the shaft offset data monitored by the shaft position detection component with the set shaft offset threshold, the vibration displacement data monitored by the vibration detection component with the set vibration displacement threshold, and the temperature data monitored by the temperature sensor 7 with the set temperature threshold. When it is determined that the rotational speed data is greater than the set rotational speed threshold, the shaft offset data is less than the set shaft offset threshold, the vibration displacement data is less than the set vibration displacement threshold, and the temperature data is less than the set temperature threshold, the motor test bench can be accurately confirmed to be in normal working condition. This avoids the problem that traditional ultra-high speed motor test benches rely on only a single or partial parameter for judgment, which may lead to the misjudgment of normal conditions as abnormal or the omission of potential hidden dangers. This provides a reliable status basis for the stable development of ultra-high speed motor testing. The S305 uses the same multi-parameter collaborative comparison logic. When the speed data is greater than the set speed threshold, the shaft offset data is less than the set shaft offset threshold, and the vibration displacement data is less than the set vibration displacement threshold but the temperature data is greater than the set temperature threshold, it can accurately eliminate interference factors such as installation eccentricity and abnormal motor vibration. It locates the root cause of the abnormality as abnormal bearing lubrication on the left input shaft or output shaft of bearing housing 3, and clearly points to the need to increase the forced cooling flow. This avoids the ineffective operation of blind repair (such as accidental disassembly of bearings or inspection of test pieces) caused by the inability of traditional test benches to distinguish the cause of temperature abnormalities. It shortens the abnormality handling cycle, reduces excessive bearing wear or damage caused by abnormal lubrication, ensures the reliability and continuity of the test bench during ultra-high speed motor testing, and meets the requirements of ultra-high speed motor testing for accurate fault location and processing efficiency.

[0041] In summary, the following is a complete technical explanation of the testing method for motor test benches. This control strategy focuses on the working state of the output shaft of bearing housing 3. Relying on multi-dimensional monitoring components (torque sensor 6, temperature sensor 7, vibration sensor 8, proximity sensor 9) and a control unit, it achieves dynamic control of the working state of bearing housing 3 and the test bench in ultra-high-speed motor testing scenarios through a closed-loop logic of "real-time data acquisition - multi-parameter threshold hierarchical comparison - precise positioning of working state - execution of corresponding measures." The specific technical solution is as follows: I. Prerequisites for Implementing Control Strategies Test bench hardware layout: The tested motor 1 is connected to the input end of the bearing housing 3 via a splined shaft 2, and the output end of the bearing housing 3 is connected to the dynamometer 5 via a coupling 4; the torque sensor 6 is mounted on the front end of the bearing housing 3 (monitoring torque and speed), the temperature sensor 7 is mounted on the bearing housing 3 (monitoring the temperature of the outer ring of the inner bearing), the vibration sensor 8 is arranged along the three directions of bearing housing 3 (X (horizontal radial), Y (axial), and Z (vertical radial) (monitoring vibration displacement, in mm / s), and the proximity sensor 9 is arranged in two groups (corresponding to the input and output shafts of bearing housing 3), each group is mounted at 90° radially (X / Z direction) (monitoring shaft center offset, in mm); the control unit receives the above sensor data synchronously in real time, and executes the control strategy with the core thresholds of 10000 rpm, shaft center offset of 0.05 mm, vibration displacement of 3.5 mm / s, and temperature of 100℃.

[0042] II. Core Process of Control Strategy After the test begins, the control unit determines the working status of the test bench according to the following hierarchical logic: 1. First layer: Speed ​​determination (threshold 10000rpm) If the speed is less than 10,000 rpm, proceed to the "Low Speed ​​- Shaft Misalignment" decision branch; If the speed is ≥10000rpm, enter the "High Speed ​​- Multi-parameter Coordination" decision branch.

[0043] 2. Second layer: Axis offset determination (threshold 0.05mm) Branch 1 (speed < 10000 rpm): If the shaft offset is ≥ 0.05 mm, it is judged as working state 2 (the test motor 1 / bearing housing 3 is installed out of alignment), and the alignment of the test motor 1 and bearing housing 3 needs to be checked; (if the shaft offset is < 0.05 mm, the state is normal at low speed of the test bench, and continuous monitoring is required) Branch 2 (speed ≥ 10000 rpm): If the shaft offset is ≥ 0.05 mm, it is judged as working state 3 (the tested motor 1 vibrates greatly and works abnormally), and the test piece needs to be checked; if the shaft offset is < 0.05 mm, enter the "vibration displacement-temperature" judgment branch.

[0044] 3. Third layer: Vibration displacement determination (threshold 3.5mm / s) (Triggered only when the rotational speed is ≥10000rpm and the shaft offset is <0.05mm) If the vibration displacement is ≥3.5mm / s, it is determined to be working state 5 (abnormal vibration of the left / right bearings in bearing housing 3), and the bearings need to be replaced; If the vibration displacement is less than 3.5 mm / s, proceed to the "Temperature Determination" branch.

[0045] 4. Fourth layer: Temperature determination (threshold 100℃) Triggered only when "speed ≥ 10000 rpm, shaft offset < 0.05 mm, vibration displacement < 3.5 mm / s". If the temperature is ≥100℃, it is determined to be working condition 4 (abnormal lubrication of the left / right bearings in bearing housing 3), and the forced cooling flow rate needs to be increased. If the temperature is <100℃, it is determined to be working state 1 (the test bench is working normally). Maintain the current test parameters and continue monitoring.

[0046] III. Advantages of Control Strategy Technology Threshold stratification accuracy: Using 10,000 rpm as the speed dividing line, and 0.05 mm, 3.5 mm / s, and 100℃ as the core thresholds for each dimension, it can achieve scenario-based judgment of "low speed to check installation and high speed to identify vibration / lubrication / bearing", avoiding misjudgment based on a single parameter; High efficiency in fault location: Each working state is derived by hierarchical logic of "speed-shaft center-vibration-temperature", which clearly points to the root cause of the fault (such as installation eccentricity, abnormal test piece, bearing failure, insufficient lubrication), which greatly shortens the time for troubleshooting. Ultra-high speed adaptability: For ultra-high speed scenarios of ≥10000rpm, the system solves the problem of delayed fault identification caused by single monitoring in traditional test benches by multi-parameter coordination (shaft center + vibration + temperature), ensuring test continuity and test bench reliability.

[0047] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0048] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0049] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A bearing housing safety protection system, characterized in that, It includes: A torque sensor (6) is used to be mounted on the bearing housing (3) and to monitor the torque and rotational speed of the bearing housing (3); Temperature sensor (7) is used to be mounted on bearing housing (3) and to monitor the operating temperature status of the inner bearing outer ring of bearing housing (3). A vibration detection assembly is assembled in the bearing housing (3) and is used to detect the vibration characteristics of the bearing housing (3); The control unit is connected to the torque sensor (6), the temperature sensor (7), and the vibration detection assembly.

2. The bearing housing safety protection system as described in claim 1, characterized in that, The vibration detection component includes: Three vibration sensors (8) are respectively used to assemble the bearing housing (3) in the X, Y and Z directions, and are used to monitor the vibration characteristics of the bearing housing (3) in the corresponding directions; wherein, the X direction is the radial horizontal direction, the Y direction is the axial direction and the Z direction is the radial vertical direction. The vibration sensor (8) is connected to the control unit.

3. The bearing housing safety protection system as described in claim 1, characterized in that, The bearing housing safety protection system also includes: A shaft center position detection component is used to be assembled on the bearing housing (3) and to monitor the shaft center position offset of the input shaft and output shaft of the bearing housing (3); The axis position detection component is connected to the control unit.

4. The bearing housing safety protection system as described in claim 3, characterized in that, The axis position detection component includes: Four proximity sensors (9) are divided into two groups, one group for the input shaft of the bearing housing (3) and the other group for the output shaft of the bearing housing (3). The two proximity sensors (9) in each group are arranged at a 90° angle in the radial plane centered on the axis of the corresponding shaft, and the detection end of the proximity sensor (9) is used to maintain a preset gap with the outer circular surface of the corresponding shaft. The proximity sensor (9) is connected to the control unit.

5. A motor test bench, characterized in that, It includes: Test motor (1); Dynamometer (5); The bearing housing (3) has its input end connected to the test motor (1) via a spline shaft (2), and its output end connected to the dynamometer (5) via a coupling (4). The bearing housing safety protection system includes a torque sensor (6), a temperature sensor (7), and a vibration detection component, which are respectively mounted on the bearing housing (3). The control unit of the safety protection system is used to determine the working status of the bearing housing (3) and execute corresponding protection actions based on the monitoring data of each sensor and the vibration detection component.

6. A test method for a motor test bench based on the bearing housing safety protection system as described in any one of claims 1-4, characterized in that, It includes the following steps: Based on the rated parameters of the tested motor (1), set the speed threshold, shaft offset threshold, vibration threshold, temperature threshold and torque safety threshold; After the test motor (1) is started, the control unit synchronously receives the torque and speed data from the torque sensor (6), the bearing outer ring temperature data from the temperature sensor (7), the three-directional vibration data from the vibration detection component, and the shaft offset data from the shaft position detection component. The operating status of the motor test bench is determined by judging the rotational speed, shaft center status, vibration status, and temperature status through the control unit.

7. The test method for the motor test bench of the bearing housing safety protection system as described in claim 6, characterized in that, The determination of the motor test bench's operating status through the control unit's judgment of rotational speed, shaft center condition, vibration condition, and temperature condition includes: If the rotational speed data is less than the set rotational speed threshold and the shaft offset data is greater than the set shaft offset threshold, it is determined that the test motor (1) or bearing housing (3) is misaligned and the alignment of the test motor (1) and bearing housing (3) needs to be checked.

8. The test method for the motor test bench of the bearing housing safety protection system as described in claim 6, characterized in that, The determination of the working state of the bearing housing (3) by means of the control unit for speed determination, shaft center condition determination, vibration condition determination and temperature condition determination includes: If the rotational speed data is greater than the set rotational speed threshold and the shaft offset data is greater than the set shaft offset threshold, then the tested motor (1) is judged to have large vibration and abnormal operation, and the test piece needs to be checked.

9. The test method for the motor test bench of the bearing housing safety protection system as described in claim 6, characterized in that, The determination of the motor test bench's operating status through the control unit's judgment of rotational speed, shaft center condition, vibration condition, and temperature condition includes: If the rotational speed data is greater than the set rotational speed threshold, the shaft offset data is less than the set shaft offset threshold, and the vibration displacement data is greater than the set vibration displacement threshold, then the bearing on the left input shaft or the output shaft of the bearing housing (3) is determined to be abnormal and the bearing needs to be replaced.

10. The test method for the motor test bench of the bearing housing safety protection system as described in claim 6, characterized in that, The determination of the motor test bench's operating status through the control unit's judgment of rotational speed, shaft center condition, vibration condition, and temperature condition includes: If the speed data is determined to be greater than the set speed threshold, the shaft offset data is less than the set shaft offset threshold, the vibration displacement data is less than the set vibration displacement threshold, and the temperature data is less than the set temperature threshold, then the motor test bench is determined to be working normally. If the rotational speed data is greater than the set rotational speed threshold, the shaft offset data is less than the set shaft offset threshold, the vibration displacement data is less than the set vibration displacement threshold, and the temperature data is greater than the set temperature threshold, then the bearing lubrication of the left input shaft or the output shaft of the bearing housing (3) is abnormal, and the forced cooling flow rate needs to be increased.

Images