A motor fault detection system and method

Abstract

The present invention discloses a motor fault detection system and method, which relates to the technical field of motor detection and includes: a detection body, a main control system, and a display screen; the main control system is provided with a number of detection operation units, including: a resistance and inductance detection unit: based on a resistance and inductance switching circuit board to form a current test circuit and a voltage test circuit for obtaining operation data under the operating state of the motor, a static torque detection unit: used to adjust the load of the motor output shaft and obtain the static torque data of the motor under the operating state of the motor; a marking unit: used to obtain the operation data of the resistance and inductance detection unit, and compare the operation data with a marking threshold. If the operation data reaches the marking threshold, the marking unit generates the setting parameters of the static torque detection unit based on the operation data. Adjusting the setting parameters of the static torque detection according to the resistance and inductance detection data can verify the correlation between the resistance and inductance data and the static torque data, and improve the accuracy and reliability of motor fault detection.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of motor detection, and particularly relates to a motor fault detection system and method. Background Art

[0002] Motor fault detection is an important means to ensure the normal operation of motors, improve equipment reliability and production efficiency. Conventional motor fault detection includes appearance detection, electrical insulation detection, motor operation detection, etc. Currently, the motor fault detection system mainly detects various detection indexes of the motor by setting multiple test stations, and summarizes and outputs the detection data of each index to obtain the detection result.

[0003] However, during the operation of the motor, different operating environments and operating parameters have different effects on the operating state of the motor. Currently, the static torque test of the motor is generally set to perform load adjustment tests under rated voltage, which cannot cover the diversity of motor operating parameter settings, affecting the accuracy and reliability of motor fault detection.

[0004] Therefore, how to intelligently detect motor faults is a technical problem that needs to be solved by current technicians. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art. The present invention provides a motor fault detection system and method. By marking the operating data of the motor under abnormal resistance and inductance values, and adjusting the setting parameters of the motor static torque detection, the influence of abnormal motor resistance and inductance on the motor static torque is obtained, improving the reliability and accuracy of motor detection.

[0006] The present invention provides a motor fault detection system. The motor fault detection system includes: a detection body, a main control system arranged in the detection body, and a display screen for displaying detection results;

[0007] The main control system is provided with a number of detection operation units, including:

[0008] A resistance and inductance detection unit: Based on a resistance and inductance switching circuit board, a current test circuit and a voltage test circuit are formed to obtain the operating data of the motor under the operating state. The operating data includes resistance value change data and inductance change data;

[0009] A static torque detection unit: Used to adjust the load of the motor output shaft under the operating state of the motor, and obtain the static torque data of the motor based on the load change;

[0010] Marking unit: It is used to obtain the operation data of the resistance and inductance detection unit, and compare the operation data with a marking threshold. If the operation data reaches the marking threshold, the marking unit generates a marking signal and generates the setting parameters of the static torque detection unit based on the marking signal.

[0011] Preferably, the detection body is provided with a plurality of test stations, and the plurality of test stations are respectively connected to a plurality of the detection operation units one by one.

[0012] Preferably, the plurality of test stations are arranged in a circular pattern along the circumferential direction, and the loading station and the unloading station of the plurality of test stations are configured as the same test station.

[0013] Preferably, the motor fault detection system further includes a pneumatic control component, and the pneumatic control component includes an air pipeline arranged on the detection body and a plurality of cylinders connected to the air pipeline;

[0014] The plurality of cylinders are connected to an external air source based on the air pipeline.

[0015] Preferably, the plurality of cylinders include a probe cylinder and a tooling cylinder arranged on any one of the test stations;

[0016] The probe cylinder is used to drive a detection probe to obtain the detection data of the motor on the corresponding test station; the tooling cylinder is used to clamp and fix the motor on the corresponding test station.

[0017] Preferably, any one of the detection operation units is provided with a working circuit in the detection body, and the plurality of working circuits are integrated in the main control system based on a relay board, and the plurality of working circuits are independent of each other.

[0018] The present invention also provides a motor fault detection method, and the detection method is applicable to the motor fault detection system. The detection method includes:

[0019] Connect the motor to the test station of the detection body, detect the current value and voltage value of the motor based on the resistance and inductance detection unit, and calculate the resistance change data and inductance change data of the motor operation based on the current value and voltage value to obtain the operation data of the motor;

[0020] Based on the marking unit, record the operation data of the resistance and inductance detection unit, compare the operation data with the marking threshold, and when the operation data is greater than or equal to the marking threshold, adjust the setting parameters of the static torque detection unit according to the operation data.

[0021] Preferably, the detection method further includes:

[0022] When the operating data is greater than or equal to the marking threshold, mark the operating data of the motor as an outlier, and record the operating voltage and operating current of the motor corresponding to the outlier;

[0023] Under the operating voltage and operating current, perform a static torque detection on the motor.

[0024] Preferably, the detecting the current value and voltage value of the motor by the resistance and inductance detecting unit includes:

[0025] Adjust the input voltage for driving the motor operation through a resistance and inductance switching circuit board, and obtain the voltage data and current data of each phase of the motor;

[0026] Calculate the resistance data and inductance data of each phase of the motor based on the voltage data and current data of each phase;

[0027] Perform a difference calculation on the resistance data of each phase of the motor to obtain the motor phase resistance difference data;

[0028] Perform a difference calculation on the inductance data of each phase of the motor to obtain the motor phase inductance difference data.

[0029] Preferably, the detection method of the static torque detection unit is: clamp the motor to be detected through the cylinder of the static torque test tooling, and apply pressure to the output shaft of the motor to be detected based on the static torque pressing cylinder, and detect the static torque value of the motor under different loads.

[0030] The present invention provides a motor fault detection system and method. A motor resistance and inductance detection unit and a static torque detection unit are integrated in the detection system. By detecting the resistance and inductance of the motor under the operating state, and using the operating data in the abnormal state of the motor resistance and inductance as the setting parameters for the static torque detection, the influence of the motor resistance and inductance data on the static torque of the motor can be detected, that is, the correlation between the motor resistance and inductance and the static torque is obtained, and the reliability and accuracy of the motor fault detection are improved. Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0032] Figure 1 It is a schematic structural diagram of the motor fault detection system in the embodiment of the present invention.

[0033] Figure 2It is a schematic diagram of the air circuit connection structure of the motor fault detection system in the embodiment of the present invention.

[0034] Figure 3 It is a schematic diagram of the control circuit connection of the main control system in the embodiment of the present invention.

[0035] Figure 4 It is a schematic diagram of the circuit structure of the resistance and inductance detection unit in the embodiment of the present invention.

[0036] Figure 5 It is a schematic diagram of the motor fault detection method in the embodiment of the present invention. Specific embodiments

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] Embodiment 1:

[0039] Figure 1 It shows a schematic diagram of the structure of the motor fault detection system in the embodiment of the present invention; the motor fault detection system includes:

[0040] A detection body 1, a main control system 2 arranged in the detection body 1, and a display screen for displaying detection results. The detection body 1 is used to place the motor to be detected. The main control system 2 is provided with a plurality of detection operation units 3. The main control system 2 performs various fault detections on the motor based on the plurality of detection operation units 3 and inputs the detection results into the display screen so that the staff can intuitively obtain the detection situation of the motor to be detected.

[0041] The plurality of detection operation units 3 include:

[0042] A resistance and inductance detection unit: Based on a resistance and inductance switching circuit board, a current test circuit and a voltage test circuit are formed to obtain the operation data of the motor during operation. The operation data includes resistance value change data and inductance change data. The motor to be detected is installed at the corresponding detection position of the resistance and inductance detection unit so that the motor to be detected is in an operating state, and the voltage and current data of the motor are obtained, thereby calculating the resistance value data and inductance data of the motor according to the voltage and current data of the motor.

[0043] Static torque detection unit: used to adjust the load on the output shaft of the motor during the operation of the motor, obtain the static torque data of the motor based on the load change, install the motor to be detected at the detection position of the static torque detection unit, and record the static torque data of the motor output shaft by changing the load of the motor.

[0044] Marking unit: used to obtain the operation data of the resistance and inductance detection unit, and compare the operation data with the marking threshold. If the operation data reaches the marking threshold, the marking unit generates a marking signal and generates the setting parameters of the static torque detection unit based on the marking signal. Connect the resistance and inductance detection unit and the static torque unit based on the marking unit, so that the static torque detection unit can adjust the setting parameters according to the detection data of the resistance and inductance detection unit, that is, the static torque detection unit can simulate the operation data of the motor under abnormal voltage and current to detect the static torque of the motor output shaft.

[0045] Furthermore, the motor fault detection system can be provided with several detection operation units 3, and the several detection operation units 3 can meet the detection requirements of the motor's withstand voltage, insulation, phase-to-phase, resistance, inductance, turn-to-turn test, shaft extension test, shaft jump test, static torque test, and rotation direction test.

[0046] Specifically, according to the marking signal sent by the marking unit, adjust the input voltage and current of the static torque detection unit, and by adjusting the load of the motor, obtain the minimum and maximum values of the static torque data of the motor output shaft under the current voltage and current data. By comparing the static torque data of the motor under different operating parameters, the correlation between the motor static torque and the motor resistance and inductance data can be obtained, and the defect change situation of the motor can be output, which can effectively predict and timely adjust the motor operation fault, and improve the reliability and accuracy of the motor fault detection.

[0047] Embodiment 2:

[0048] Specifically, please refer to Figure 1 , the detection body 1 is provided with several test stations 4, and the several test stations 4 are respectively connected to several detection operation units 3. The test station 4 is used to hold and detect the motor. When the motor is located at one of the several test stations 4, the motor can be connected to the detection operation unit 3 corresponding to the test station 4, so as to realize the fault detection of the motor.

[0049] Specifically, several of the test stations 4 are arranged in a circular pattern along the circumferential direction, and the loading station and the unloading station of several of the test stations 4 are configured as the same test station 4. The several test stations 4 include: a first test station, a second test station, a third test station, a fourth test station, a fifth test station, a sixth test station, a seventh test station, and an eighth test station. The first test station, the second test station, the third test station, the fourth test station, the fifth test station, the sixth test station, the seventh test station, and the eighth test station are arranged in a circular pattern, so that the motor to be detected can rotate circumferentially from the first test station and sequentially pass through the first test station, the second test station, the third test station, the fourth test station, the fifth test station, the sixth test station, the seventh test station, and the eighth test station to complete the fault detection of various structural parameters and operating parameters of the motor to be detected.

[0050] Furthermore, the circular arrangement can reduce the occupied space of the arrangement of several test stations 4 and improve the rationality of the spatial layout of the detection body 1.

[0051] Furthermore, the first test station is set as the loading and unloading station, that is, the motor to be detected can be fixed by tooling at the first test station for the loading and unloading operations of the motor on the detection body 1.

[0052] The second test station is set for withstand voltage test, insulation test, and phase-to-phase test. The withstand voltage test is used to evaluate the insulation performance of the motor, gradually boost the voltage output of the motor, and simultaneously detect whether there are discharges, leakage, etc. during the operation of the motor to ensure that the motor can operate normally under rated voltage or overvoltage.

[0053] The phase-to-phase test is to conduct an electrical test on the connection of two-phase coils on the stator of the motor to determine the accurate phase-to-phase connection of the motor;

[0054] The motor insulation test can measure the resistance value between the motor winding and the ground wire using a resistance meter to detect the insulation performance of the motor. The motor insulation test can also adopt test methods such as dielectric strength method, DC insulation resistance test method, polarization index test method, and dielectric loss test method.

[0055] Setting the withstand voltage test, insulation test, and phase-to-phase test on the same test station 4 can simplify the structural layout of the detection body 1 and enable the detection body 1 to simultaneously meet multiple fault detection indicators of the motor.

[0056] The third test station is configured as a resistance and inductance test station, the fourth test station is configured as a motor inter-turn test station, the fifth test station is configured as a motor shaft extension test station, the sixth test station is configured as a motor shaft runout test station, the seventh test station is configured as a static torque test station, and the eighth test station is configured as a rotation direction test station.

[0057] By detecting the motor shaft extension, it is ensured that the dimensions, shape, position accuracy, and surface quality of the shaft extension meet the design requirements, thus ensuring the normal connection and transmission efficiency between the motor and equipment such as couplings and pulleys, and at the same time avoiding problems such as vibration, noise, and wear.

[0058] By detecting the motor shaft runout, the runout data of the motor output shaft during operation is obtained to detect whether the shaft runout of the motor output shaft meets the requirements for stable operation of the motor.

[0059] Specifically, the motor shaft extension test station 4 is correspondingly connected to the motor shaft extension detection unit in the main control system 2, the motor shaft runout test station 4 is correspondingly connected to the motor shaft runout detection unit of the main control system 2, and the marking unit is signal-connected to the shaft extension detection unit and the shaft runout detection unit, that is, the marking unit can obtain the detection data of the shaft extension detection unit and the detection data of the shaft runout detection unit.

[0060] Furthermore, the shaft extension detection unit is used to detect the external dimensions and motion data of the motor output shaft. The identification unit compares the shaft extension data of the motor with a preset marking threshold. In this embodiment, the difference between the shaft extension data of the motor and the marking threshold is calculated, and it is detected whether the difference reaches 20% of the marking threshold. If so, the marking unit marks the shaft extension data of the motor as abnormal and marks the defect situation of the motor output shaft according to the shaft extension data.

[0061] Furthermore, when performing the static torque detection of the motor, the test parameters of the static torque are adjusted according to the defect situation marked by the shaft extension data. When it is marked according to the shaft extension data that there are defects in the surface dimensions of the motor output shaft, the effective connection area of the motor output shaft is compared with the standard connection effective area to obtain the connection area ratio of the motor output shaft. When performing the static torque detection, the load size can be adjusted according to the connection area ratio of the motor output shaft to reduce the influence of the defects of the motor output shaft on the static torque test.

[0062] Specifically, the motor shaft jump test station 4 is correspondingly connected to the motor shaft jump detection unit in the main control system 2. By driving the motor to operate normally under the rated voltage and recording the wobbling condition of the rotation of the motor output shaft, the probe is set on the outer circumference of the motor output shaft and kept at a preset gap from the motor output shaft. Based on the contact condition between the motor output shaft and the probe during rotation, the shaft jump data of the motor output shaft is obtained.

[0063] The marking unit is signal-connected to the shaft jump detection unit and the shaft jump detection unit, that is, the marking unit can obtain the detection data of the shaft jump detection unit. When the shaft jump of the output shaft of the motor exceeds the shaft jump threshold of the motor product specification, the test time of the static torque is adjusted according to the shaft jump data of the motor, which can effectively reduce the risk of equipment damage during the static torque test of the motor.

[0064] Specifically, Figure 2 The schematic diagram of the air circuit connection structure of the motor fault detection system in the embodiment of the present invention is shown. The motor fault detection system further includes a pneumatic control component. The pneumatic control component includes an air circuit pipeline arranged on the detection body 1 and several cylinders connected to the air circuit pipeline. The several cylinders are connected to an external air source based on the air circuit pipeline. The cylinders are provided with solenoid valves at the connection positions of the air circuit pipeline. Based on the working signal of the main control system 2, the opening and closing states of the solenoid valves are adjusted, that is, the working states of the cylinders are controlled.

[0065] Specifically, the several cylinders include a probe cylinder and a tooling cylinder arranged on any one of the test stations 4. The probe cylinder is used to drive the detection probe to obtain the detection data of the motor on the corresponding test station 4, and the tooling cylinder is used to clamp and fix the motor on the corresponding test station 4. Based on the pneumatic control component, the working control of each detection operation unit 3 can be realized, so that the detection operation unit 3 can perform fault detection on the motor.

[0066] Specifically, Figure 3 The schematic diagram of the control circuit connection of the main control system 2 in the embodiment of the present invention is shown. Any one of the detection operation units 3 is provided with a working circuit in the detection body 1. The main control system 2 integrates several working circuits based on a 24-channel relay board, so that the several working circuits are integrated in the main control system 2 based on the relay board and the several working circuits are independent of each other, so as to accurately control the work of the detection operation unit 3.

[0067] Further, please refer to Figure 3, one end of the control circuit is connected with an emergency stop relay to realize the emergency stop function of the control circuit, ensuring that the power supply can be quickly cut off in case of emergency and improving the operation safety of the main control system 2.

[0068] Figure 4 The circuit structure diagram of the resistance and inductance detection unit in the embodiment of the present invention is shown. The resistance and inductance detection unit is an integrated circuit board based on a resistance and inductance switching test board, connected to a digital bridge through an output port on one side and connected to a resistance meter through an output port on the other side. The input port of the resistance and inductance switching test board is connected to each phase of the motor, and based on the resistance and inductance switching test board, the current and voltage data of each phase of the motor are obtained and sent to the digital bridge and the resistance meter, so as to output the resistance and inductance data of the motor to the main control system 2.

[0069] Further, the probe on the test station 4 contacts the phase of the motor, a level signal is sent to the motor phase based on the digital bridge, and the inductance value of the motor is obtained according to the response of each phase of the motor.

[0070] Further, the resistance and inductance detection unit obtains the current data and voltage data of each phase of the motor. According to the current and voltage measurement data of the motor phase, based on each phase of the motor as an independent inductance-resistance series circuit, the calculation formula of the inductance is:

[0071]

[0072] Where Z is the impedance, R is the resistance of the motor phase, ω is the angular frequency of the alternating current (ω = 2πf, where f is the frequency), and L is the inductance.

[0073] Combined with the current data and voltage data of the motor phase obtained by the resistance and inductance detection unit, the inductance L is calculated. The calculation formula of the inductance L is equivalent to:

[0074]

[0075] Where sinφ is the sine value of the phase difference between the voltage and the current, ω is the angular frequency of the alternating current, U is the phase voltage, I is the phase current, and L is the inductance.

[0076] Specifically, the motor is driven to operate according to the set rated voltage, and the motor is gradually boosted so that the motor can operate under stable voltage and overvoltage conditions, thereby obtaining the inductance data and resistance data of the motor under different operating voltage states.

[0077] According to the product specifications of the motor and combining with the experience of the staff, a marking threshold for the motor operation data is set. The marking unit performs a comparison and detection on the motor inductance and resistance data based on the marking threshold. When the operation data of the motor is greater than or equal to the marking threshold, the marking unit records the operation data of the motor as abnormal data and obtains the operation data of the motor, that is, the corresponding voltage data and current data when the motor inductance and resistance data are abnormal.

[0078] The marking unit generates an identification signal based on the voltage data and current data. The main control system 2 obtains the identification signal and sets the setting parameters of the static torque detection unit according to the identification signal.

[0079] In the embodiment of the present invention, by setting a marking unit to mark each fault detection data of the motor, adjusting the setting parameters of the motor static torque test according to the resistance and inductance data of the motor, adjusting the load setting parameters of the motor static torque according to the shaft extension data, and adjusting the test time of the motor static torque according to the shaft jump data, the accuracy and reliability of the motor static torque test can be improved.

[0080] Embodiment Three:

[0081] Figure 5 The schematic diagram of the motor fault detection method in the embodiment of the present invention is shown. The detection method includes:

[0082] S11: Loading the motor.

[0083] Connect the motor to the first test station of the detection body, and drive the tooling fixture to clamp and fix the motor through the tooling cylinder at the first test station.

[0084] Further, when there is a motor that has completed the fault detection at the first test station, the motor is unloaded by a tooling operator or an industrial robot, and the motor to be detected is clamped at the first test station.

[0085] S12: Withstand voltage, insulation and phase - to - phase detection.

[0086] Transfer the motor to be detected from the first test station to the second test station, and drive the detection probe through the probe cylinder at the second test station to perform a withstand voltage test, an insulation test and a phase - to - phase test on the motor to be detected. The withstand voltage test, insulation test and phase - to - phase test are important detection indexes for the insulation performance of the motor.

[0087] The withstand voltage test is used to evaluate the insulation performance of the motor, gradually boost the voltage output of the motor, and simultaneously detect whether there are situations such as discharge and leakage during the operation of the motor to ensure that the motor can operate normally under the rated voltage or over - voltage conditions.

[0088] The phase - to - phase test is to conduct an electrical test on the connection of the coils between two phases on the motor stator to determine the accurate phase - to - phase connection of the motor.

[0089] For the motor insulation test, a resistance meter can be used to measure the resistance value between the motor winding and the ground wire, thereby detecting the insulation performance of the motor. The motor insulation test can also adopt test methods such as the dielectric strength method, the DC insulation resistance test method, the polarization index test method, and the dielectric loss test method.

[0090] S13: Resistance - inductance test.

[0091] Specifically, the motor is transferred to the third test station. The cylinder probes on the third test station are connected to each phase of the motor, so that the motor is electrically connected to the relay board of the resistance - inductance detection unit, and the phase current and voltage values of the motor are obtained based on the relay board.

[0092] Based on the resistance - inductance detection unit, the current value and voltage value of the motor are detected, and the resistance change data and inductance change data of the motor operation are calculated based on the current value and voltage value to obtain the operation data of the motor. The resistance and inductance of each phase of the motor are calculated to detect whether the resistance and inductance data of each phase of the motor are within the preset numerical range, thereby detecting whether the motor has a fault.

[0093] Specifically, the detection of the current value and voltage value of the motor based on the resistance - inductance detection unit includes:

[0094] Adjust the input voltage for driving the motor operation through the resistance - inductance switching circuit board, and obtain the voltage data and current data of each phase of the motor.

[0095] Based on the voltage data and current data of each phase, the resistance value data and inductance data of each phase of the motor are calculated. The difference calculation is performed on the resistance value data of each phase of the motor to obtain the phase resistance difference data of the motor. The resistance difference data is compared with the standard resistance value data, and the detection result of the motor resistance test is output.

[0096] The difference calculation is performed on the inductance data of each phase of the motor to obtain the phase inductance difference data of the motor. The phase inductance difference data of the motor is compared with the standard inductance data, and the detection result of the motor phase inductance test is output.

[0097] Furthermore, the standard resistance value data and the standard inductance data are configured based on the motor product model specifications and the experience values of the staff.

[0098] S14: Marking process.

[0099] Specifically, based on the marking unit, the operation data of the resistance and inductance detection unit is recorded, and the operation data is compared with the marking threshold. When the operation data is greater than or equal to the marking threshold, the setting parameters of the static torque detection unit are adjusted according to the operation data.

[0100] When the operation data is greater than or equal to the marking threshold, mark the operation data of the motor as an outlier, and record the operating voltage and operating current of the motor corresponding to the outlier.

[0101] Under the operating voltage and operating current, perform a static torque detection on the motor, so as to be able to detect the static torque data of the motor under different voltages and currents, and improve the accuracy of the static torque data detection.

[0102] S15: Inter-turn test.

[0103] Transfer the motor to the fourth test station, and detect the stator winding of the motor based on the cylinder probe of the fourth test station. By detecting the current and voltage changes in the stator winding, judge whether there is insulation failure or short circuit between the turns of the winding, and ensure the normal operation and long-term stability of the motor.

[0104] S16: Shaft extension test.

[0105] Specifically, the motor shaft extension test station is correspondingly connected to the motor shaft extension detection unit in the main control system, the motor shaft runout test station is correspondingly connected to the motor shaft runout detection unit in the main control system, and the marking unit is signal-connected to the shaft extension detection unit and the shaft runout detection unit, that is, the marking unit can obtain the detection data of the shaft extension detection unit and the detection data of the shaft runout detection unit.

[0106] Further, the shaft extension detection unit is used to detect the external dimensions and action data of the motor output shaft. The identification unit compares the shaft extension data of the motor with a preset marking threshold. In this embodiment, calculate the difference between the shaft extension data of the motor and the marking threshold, and detect whether the difference reaches 20% of the marking threshold. If so, the marking unit marks the shaft extension data of the motor as abnormal, and marks the defect condition of the motor output shaft according to the shaft extension data.

[0107] Further, when performing the static torque detection of the motor, adjust the test parameters of the static torque according to the defect condition marked by the shaft extension data. When it is marked according to the shaft extension data that there are defects in the surface dimensions of the motor output shaft, then obtain the effective connection area of the motor output shaft and compare it with the standard connection effective area, and obtain the connection area ratio of the motor output shaft. When performing the static torque detection, the load size can be adjusted according to the connection area ratio of the motor output shaft to reduce the influence of the defects of the motor output shaft on the static torque test.

[0108] S17: Axial jump test.

[0109] Specifically, the motor axial jump test station is correspondingly connected to the motor axial jump detection unit in the main control system. By driving the motor to run normally under the rated voltage and recording the wobbling condition of the rotation of the motor output shaft, and by setting a probe on the outer circumference of the motor output shaft and maintaining a preset gap with the motor output shaft, the axial jump data of the motor output shaft is obtained based on the contact condition between the motor output shaft and the probe during rotation.

[0110] The marking unit is signal-connected to the axial jump detection unit and the axial jump detection unit, that is, the marking unit can obtain the detection data of the axial jump detection unit. When the axial jump of the output shaft of the motor exceeds the axial jump threshold of the motor product specification, the test time of the static torque is adjusted according to the axial jump data of the motor, which can effectively reduce the risk of equipment damage during the static torque test of the motor.

[0111] S18: Static torque test.

[0112] The detection method of the static torque detection unit is: the motor to be detected is clamped by the static torque test tooling cylinder, and pressure is applied to the output shaft of the motor to be detected based on the static torque pressing cylinder, and the static torque values of the motor under different loads are detected.

[0113] Specifically, the motor is transferred to the test station corresponding to the static torque detection unit, and the output shaft of the motor is connected through a traction motor. By applying pressure to the motor based on the traction motor, the load adjustment of the motor output shaft is realized, so as to test the static torque data of the motor under different loads.

[0114] Further, the traction motor is connected to the stepper speed controller of the main control system, and by adjusting the rotation speed of the motor, the load pressurization simulation of the motor output shaft is realized.

[0115] Specifically, the static torque detection unit adjusts the test setting parameters according to the marking signal of the marking unit, sets a test control group according to the abnormal data of the resistance and inductance of the marking signal, and sets the motor to perform a static torque test under the voltage and current data corresponding to the abnormal data of the resistance and inductance, so as to detect the correlation between the static torque of the motor and the resistance and inductance data of the motor.

[0116] Since the resistance and inductance of the motor can reflect the change of the magnetic field during the operation of the motor, under abnormal values, the internal magnetic field of the motor affects the static torque of the motor. Based on the test of the static torque of the motor under abnormal data, the static torque test data of the motor under different operating conditions can be obtained, improving the accuracy of motor fault detection.

[0117] Specifically, the static torque detection unit obtains the shaft extension data of the motor based on the marking signal of the marking unit, and adjusts the rotational speed of the traction motor based on the shaft extension data, so that the traction motor can adjust the load pressure according to the effective connection area of the output shaft of the motor, improving the accuracy of the static torque test of the motor.

[0118] The static torque detection unit obtains the shaft jump data of the motor based on the marking signal of the marking unit, and adjusts the detection time of the static torque of the motor according to the shaft jump amplitude of the motor. In this embodiment, based on the shaft jump amplitude ratio of the motor, the test time of the static torque is adjusted. The adjustment formula is:

[0119] T = T0 * (2 - ε);

[0120] Wherein, T is the static torque test time, T0 is the standard time of the static torque test, ε is the shaft jump amplitude ratio of the motor, and 1 ≤ ε < 2.

[0121] Further, the shaft jump amplitude ratio is obtained by comparing the shaft jump amplitude of the motor with the preset shaft jump standard amplitude. If ε is greater than 2, the motor is marked as a non-conforming product, and the operator is based on the cutting and transfer of the motor, that is, the static torque test time is set to 0 to avoid the situation of test damage.

[0122] Adjusting the static torque test time of the motor based on the shaft jump data can avoid the situation of abnormal torque transmission or equipment damage during the test of the motor and traction motor and other equipment.

[0123] S19: Rotation direction test.

[0124] The main purpose of the motor rotation direction test is to determine the rotation direction of the motor. The motor is set on the rotation direction test station, and the probe is gently approached to the motor shaft. When the rotor starts to rotate, the movement direction based on the probe is the direction of the motor rotation direction.

[0125] S10: Output the detection result.

[0126] The main control system outputs the detection data of each detection index of the motor on the display screen according to the detection results of each test station.

[0127] The present invention provides a motor fault detection system and method. An electric motor resistance and inductance detection unit and a static torque detection unit are integrated in the detection system. By detecting the resistance and inductance of the motor during operation and using the operation data under the abnormal state of the motor resistance and inductance as the setting parameters for the static torque detection, the influence of the motor resistance and inductance data on the static torque of the motor can be detected, that is, the correlation between the motor resistance and inductance and the static torque is obtained, improving the reliability and accuracy of the motor fault detection.

[0128] Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium, which can include: read-only memory (ROM, Read Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk, etc.

[0129] In addition, the above embodiments of the present invention have been introduced in detail. Specific examples have been used in this article to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A motor fault detection system, characterized in that: The motor fault detection system comprises: a detection body, a main control system arranged in the detection body, and a display screen for displaying the detection results; The main control system is provided with several detection operation units, including: Resistance and inductance detection unit: based on the resistance and inductance switching circuit board, a current test circuit and a voltage test circuit are formed to obtain the operation data of the motor under the running state, and the operation data includes resistance change data and inductance change data; Static torque detection unit: used to adjust the load of the motor output shaft when the motor is running, and obtain the static torque data of the motor based on the load change; A marking unit: used for obtaining the operation data of the resistance and inductance detection unit, and comparing the operation data with the marking threshold value. If the operation data reaches the marking threshold value, the marking unit generates a marking signal and generates the setting parameters of the static moment detection unit based on the marking signal; According to the marking signal emitted by the marking unit, the input voltage and current of the static torque detection unit are adjusted, and by adjusting the load of the motor, the minimum and maximum values ​​of the static torque data of the motor output shaft under the current voltage and current data are obtained. By comparing the static torque data of the motor under different operating parameters, the correlation between the static torque of the motor and the resistance and inductance data of the motor can be obtained, and the defect changes of the motor can be output.

2. The motor fault detection system according to claim 1, characterized in that: The detection machine body is provided with a plurality of test stations, and the plurality of test stations are connected to a plurality of the detection operation units in a one-to-one correspondence.

3. The motor fault detection system according to claim 2, characterized in that: A plurality of the test stations are arranged in a circle along the circumferential direction, and a loading station and an unloading station of a plurality of the test stations are configured as the same test station.

4. The motor fault detection system according to claim 3, characterized in that: The motor fault detection system further comprises a pneumatic control assembly, wherein the pneumatic control assembly comprises an air pipeline arranged on the detection body, and a plurality of cylinders connected to the air pipeline; A plurality of the cylinders are connected to an external gas source based on the gas pipeline.

5. The motor fault detection system according to claim 4, characterized in that: The plurality of cylinders include a probe cylinder and a tooling cylinder disposed on any of the test stations; The probe cylinder is used to drive the detection probe to obtain the detection data of the motor on the corresponding test station; The tooling cylinder is used to clamp and fix the motor corresponding to the test station.

6. The motor fault detection system according to claim 1, characterized in that: Any of the detection operation units is provided with a working circuit in the detection body, and several of the working circuits are integrated in the main control system based on a relay board, and the several working circuits are independent of each other.

7. A motor fault detection method, characterized in that: The detection method is applicable to the motor fault detection system according to any one of claims 1 to 6, and the detection method comprises: Connect the motor to the test station of the detection body, detect the current value and voltage value of the motor based on the resistance and inductance detection unit, and calculate the resistance change data and inductance change data of the motor operation based on the current value and voltage value to obtain the operation data of the motor; Recording the operation data of the resistance and inductance detection unit based on the marking unit, comparing the operation data with the marking threshold, and when the operation data is greater than or equal to the marking threshold, adjusting the setting parameters of the static moment detection unit according to the operation data; When the operating data is greater than or equal to the marking threshold, marking the operating data of the motor as an abnormal value, and recording the motor operating voltage and operating current corresponding to the abnormal value; Perform static torque detection on the motor under operating voltage and current.

8. The motor fault detection method according to claim 7, characterized in that: The method of detecting the current value and voltage value of the motor based on the resistance and inductance detection unit includes: The input voltage of the drive motor is adjusted through the resistor-inductor switching circuit board, and the voltage and current data of each phase of the motor are obtained; Calculate the resistance data and inductance data of each phase of the motor based on the voltage data and current data of each phase; Calculate the difference of each phase resistance data of the motor to obtain the motor phase resistance difference data; The inductance data of each phase of the motor is differentially calculated to obtain motor phase inductance difference data.

9. The motor fault detection method according to claim 7, characterized in that: The detection method of the static torque detection unit is: the motor to be detected is clamped by a static torque test tooling cylinder, and pressure is applied to the output shaft of the motor to be detected based on the static torque clamping cylinder to detect the static torque value of the motor under different loads.

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