Motor product abnormal noise testing equipment and method

Abstract

The present invention discloses a motor product abnormal sound test device and method, including a rotation drive component, a vibration transmission component, an audio player component, an audio collection component and a control component. The rotation drive component is used to connect the rotating shaft of the target motor, the vibration transmission component can abut the target motor, the audio player component is connected to the vibration transmission component, and the sound playback end faces the vibration transmission component, the audio collection component is arranged in the test area, and the control component is electrically connected to the rotation drive component, the audio player component and the audio collection component respectively. The control component is used to control the rotation drive component to drive the target motor to rotate, and send a sweep signal of a preset frequency band to the audio player component, and collect sound signals through the audio collection component to determine whether the target motor has abnormal sounds during the rotation process according to the sound signals. The present invention can detect abnormal sounds on the target motor by resonance to determine whether the target motor has the problem of poor parts assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of motor testing, and in particular to a device and method for testing abnormal noise of motor products. Background Art

[0002] Small motors, especially those used in electroacoustic products, may be poorly assembled, resulting in loose parts (such as rotating shafts). This can cause vibrations during rotation and produce a buzzing sound, which can reduce the user experience. Therefore, motor products need to be inspected before leaving the factory. The relevant technology is to perform inspections by manual listening, but this method is highly subjective, inaccurate, and inefficient. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a motor product abnormal noise testing device and method, which can detect abnormal noise of a target motor by resonance to determine whether the target motor has a problem of poor assembly of parts.

[0004] On the one hand, an embodiment of the present invention provides a motor product abnormal noise testing device, which is suitable for testing a target motor, and includes:

[0005] A rotation drive assembly, used to connect to the rotating shaft of the target motor, and the area where the target motor is located is the test area;

[0006] a vibration transmission component capable of abutting against the target motor;

[0007] An audio playing component having a sound playing end, the audio playing component is connected to the vibration transmitting component, and the sound playing end faces the vibration transmitting component;

[0008] An audio collection component is arranged in the test area, and the audio collection component is used to collect sound signals;

[0009] A control component is electrically connected to the rotation drive component, the audio playback component and the audio collection component, respectively. The control component is used to control the rotation drive component to drive the target motor to rotate, and to send a sweep frequency signal with a frequency of a preset frequency band that changes over time to the audio playback component, and to collect sound signals through the audio collection component to determine whether there is abnormal sound during the rotation of the target motor based on the sound signals.

[0010] According to some embodiments of the present invention, the audio playback component and the test area are distributed on opposite sides of the vibration transmission component, and the position of the audio playback component is adapted to the test area.

[0011] According to some embodiments of the present invention, the vibration transmission component is a vibration transmission plate, the audio playback component is connected to a first side of the vibration transmission plate, and a second side of the vibration transmission plate abuts against a side wall of the target motor.

[0012] According to some embodiments of the present invention, the control component includes an audio analysis module, which includes multiple of a HOHD analysis unit, a TD analysis unit, a THD analysis unit, a FR analysis unit and a TE analysis unit, a frequency domain conversion unit and an abnormal sound determination unit, the frequency domain conversion unit is used to perform frequency domain conversion on the sound signal to obtain a spectrum curve; the HOHD analysis unit is used to perform a high-order harmonic distortion analysis on the spectrum curve to obtain a first analysis result, the TD analysis unit is used to perform a total distortion analysis on the spectrum curve to obtain a second analysis result, the THD analysis unit is used to perform a total harmonic distortion analysis on the spectrum curve to obtain a third analysis result, the FR analysis unit is used to perform a frequency response analysis on the spectrum curve to obtain a fourth analysis result, the TE analysis unit is used to perform a total harmonic energy distortion analysis on the spectrum curve to obtain a fifth analysis result, and the abnormal sound determination unit is used to determine whether the target motor has abnormal sound according to multiple of the first analysis result, the second analysis result, the third analysis result, the fourth analysis result and the fifth analysis result.

[0013] According to some embodiments of the present invention, the control component further includes a main control module, and a driving module, an audio sending module, and an audio sampling module respectively connected to the main control module.

[0014] On the other hand, an embodiment of the present invention provides a motor product abnormal sound testing method, which is applied to the above-mentioned motor product abnormal sound testing device, comprising:

[0015] Placing a target motor in the test area, and connecting a rotating shaft of the target motor to the rotation drive assembly;

[0016] The control component drives the target motor to rotate around its own rotation axis through the rotation drive component;

[0017] During the rotation of the target motor, the control component sends a sweep frequency signal of a preset frequency band to the audio playing component, so that the audio playing component transmits the energy fluctuation generated by the playing sound to the target motor through the vibration transmission component;

[0018] The control component collects sound signals through the audio collection component;

[0019] The control component analyzes the sound signal to determine whether there is abnormal sound during the rotation of the target motor according to the sound signal.

[0020] According to some embodiments of the present invention, the control component sends a sweep frequency signal of a preset frequency band to the audio playback component, including:

[0021] The control component sends a continuous frequency sweep signal with a frequency range of 500-2000 Hz and a change interval of 1 / 12 octave to the audio playback component.

[0022] According to some embodiments of the present invention, the control component analyzes the sound signal to determine whether the target motor has abnormal sound during rotation according to the sound signal, including:

[0023] The control component performs frequency domain transformation on the sound signal to obtain a frequency spectrum curve;

[0024] The control component performs multiple analysis of HOHD analysis, TD analysis, THD analysis, FR analysis and TE analysis on the spectrum curve to obtain multiple analysis results;

[0025] The control component determines whether the target motor has abnormal noise during rotation according to the multiple analysis results.

[0026] According to some embodiments of the present invention, the motor product abnormal noise testing method further includes:

[0027] In the case where the target motor has an abnormal sound, the control component determines the angular position of the target motor according to the frequency of the abnormal sound;

[0028] Alternatively, when an abnormal sound is present in the target motor, the control component determines the angular position interval of the target motor according to a frequency range of the abnormal sound.

[0029] According to some embodiments of the present invention, when there is an abnormal sound in the target motor, the control component determines the angular position of the target motor according to the frequency of the abnormal sound, including:

[0030] In the case where the target motor has an abnormal sound, the control component determines the frequency of the abnormal sound;

[0031] Determining the occurrence time of the abnormal sound according to the frequency of the abnormal sound and the frequency sweep signal;

[0032] Determining the angular position at which the abnormal sound occurs in the target motor according to the occurrence time of the abnormal sound and the rotation speed of the target motor;

[0033] Alternatively, when the target motor has an abnormal sound, the control component determines the angular position interval of the target motor according to the frequency range of the abnormal sound, including:

[0034] In the case where the target motor has an abnormal sound, the control component determines a frequency range of the abnormal sound;

[0035] Determining the occurrence period of the abnormal sound according to the frequency range of the abnormal sound and the frequency sweep signal;

[0036] According to the occurrence time period of the abnormal sound and the rotation speed of the target motor, the angular position interval in which the abnormal sound occurs in the target motor is determined.

[0037] The embodiments of the present invention have at least the following beneficial effects:

[0038] By controlling the rotation of the target motor through the rotating drive component, different positions of the target motor can be detected. The energy fluctuations generated by the sound played by the audio playback component are transmitted to the target motor through the vibration transmission component. If the target motor has poor parts assembly, the energy fluctuations will cause the target motor to resonate, thereby making the target motor emit abnormal sounds. By collecting sound signals through the audio acquisition component and analyzing the sound signals, it can be determined whether there are abnormal sounds in the rotation process of the target motor, and then whether there is a problem of poor parts assembly of the target motor. The detection efficiency is high and the detection is accurate.

[0039] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0041] Figure 1 A schematic diagram of the structure of a motor product abnormal noise testing device according to an embodiment of the present invention;

[0042] Figure 2 It is a principle block diagram of the control components of the abnormal noise testing device for motor products according to an embodiment of the present invention;

[0043] Figure 3 A functional block diagram of an audio analysis module of a motor product abnormal sound testing device according to an embodiment of the present invention;

[0044] Figure 4 A flowchart of the steps of a method for testing abnormal noise of a motor product according to an embodiment of the present invention;

[0045] Figure 5 HOHD analysis curve diagram of a good motor and a bad motor according to an embodiment of the present invention;

[0046] Figure 6 TD analysis curve diagram of a good motor and a bad motor according to an embodiment of the present invention;

[0047] Figure 7 The THD analysis curve diagram of a good motor and a bad motor according to an embodiment of the present invention;

[0048] Figure 8 FR analysis curve diagram of a good motor and a defective motor according to an embodiment of the present invention.

[0049] Reference numerals:

[0050] Target motor 10, rotation drive component 100, vibration transmission component 200, audio playback component 300, audio acquisition component 400, main control module 510, drive module 520, audio sending module 530, audio sampling module 540, audio analysis module 550, frequency domain conversion unit 551, HOHD analysis unit 552, TD analysis unit 553, THD analysis unit 554, FR analysis unit 555, TE analysis unit 556, abnormal sound determination unit 557. DETAILED DESCRIPTION

[0051] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0052] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0053] In the description of the present invention, "several" means one or more, "multiple" means more than two, greater than, less than, and exceeding are understood as not including the number itself, and "above", "below", and "within" are understood as including the number itself. If there is a description of "first", "second", etc., it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0054] In the description of the present invention, unless otherwise clearly defined, words such as “setting”, “installation” and “connection” should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0055] Terminology Note:

[0056] HOHD: High Order Harmonic Distortion, high-order harmonic distortion;

[0057] TD: Total Distortion, total distortion;

[0058] THD: Total Harmonic Distortion, total harmonic distortion;

[0059] FR:Frequency Response,frequency response;

[0060] TE: Total Energy, total harmonic energy distortion;

[0061] Rub & Buzz: Rub and buzz.

[0062] Please refer to Figure 1 This embodiment discloses a motor product abnormal sound testing device, which is suitable for testing a target motor 10. The motor product abnormal sound testing device includes a rotation drive component 100, a vibration transmission component 200, an audio playback component 300, an audio collection component 400 and a control component. The rotation driving component 100 is used to connect the rotating shaft of the target motor 10, the area where the target motor 10 is located is the test area, the vibration transmission component 200 can abut the target motor 10, the audio playing component 300 has a sound playing end, the audio playing component 300 is connected to the vibration transmission component 200, and the sound playing end faces the vibration transmission component 200, the audio collecting component 400 is arranged in the test area, the audio collecting component 400 is used to collect sound signals, the control component is electrically connected to the rotation driving component 100, the audio playing component 300 and the audio collecting component 400 respectively, the control component is used to control the rotation driving component 100 to drive the target motor 10 to rotate, and send a sweeping frequency signal with a frequency varying with time in a preset frequency band (i.e., a certain frequency range) to the audio playing component 300, and collect sound signals through the audio collecting component 400 to determine whether there is abnormal sound during the rotation of the target motor 10 according to the sound signals.

[0063] This embodiment uses a small motor (especially a small motor in an electroacoustic product) as the target motor 10. The small motor has the characteristics of small size and light weight. By reasonably configuring the sound playback power of the audio playback component 300, the energy fluctuations generated by the sound can be transmitted to the target motor 10 through the vibration transmission component 200. Among them, the rotation drive component 100 adopts a servo motor component. The output shaft of the servo motor component is connected to the rotating shaft of the target motor 10. The servo motor component drives the rotating shaft of the target motor 10 to rotate, thereby driving the target motor 10 to rotate. In this way, the target motor 10 and the servo motor component can rotate coaxially. The servo motor can drive the target motor 10 to rotate at a uniform speed, so that different positions of the target motor 10 can abut against the vibration transmission component 200, so as to detect the position that may cause abnormal sound. The installation position of the audio acquisition component 400 can be set according to the actual application scenario. For example, the motor product abnormal sound test equipment also includes an equipment housing, and a sound insulation cavity (such as Figure 1 As shown by mark Z in the figure), the soundproof cavity can reduce the interference of environmental noise on the test, the test area is located in the soundproof cavity, the audio collection component 400 has an audio collection end, for example, the audio collection component 400 adopts a microphone, in some application examples, the audio collection component 400 is installed in the soundproof cavity, and the audio collection end of the audio collection component 400 is facing the test area where the target motor 10 is located; or, in other application examples, the position where the vibration transmission component 200 abuts the target motor 10 is the abutment position, the audio collection component 400 is arranged in the test area, and the audio collection end of the audio collection component 400 is facing the abutment position.

[0064] The audio player component 300 and the test area are distributed on the opposite sides of the vibration transmission component 200, and the position of the audio player component 300 is adapted to the test area. For example, the audio player component 300 adopts a speaker assembly, and the audio player component 300 and the vibration transmission component 200 are distributed up and down, that is, the audio player component 300 is connected to the bottom of the vibration transmission component 200, and the position of the audio player component 300 is located directly below the test area, and the target motor 10 is located in the test area, and the vibration transmission component 200 can play a bearing role to the target motor 10, and the target motor 10 abuts against the vibration transmission component 200 under the action of gravity, and the energy fluctuation generated by the audio player component 300 playing sound is transmitted to the target motor 10 through the vibration transmission component 200, thereby causing the resonance of the target motor 10 under the sound wave energy of the partial frequency. In order to reduce the transmission loss of the sound wave energy, the audio player component 300 is closely connected to the vibration transmission component 200. Or, for example, the audio playback component 300 and the vibration transmission component 200 are distributed along a straight line in the horizontal direction, such as left to right or front to back, and the vibration transmission component 200 abuts against the target motor 10 from the side of the target motor 10. It should be noted that the target motor 10 includes a motor housing and a rotating shaft extending from the motor housing, and the vibration transmission component 200 can abut against the motor housing from the side of the motor housing.

[0065] In some application examples, the vibration transmission component 200 is a vibration transmission plate, the audio player component 300 is connected to the first side of the vibration transmission plate, the second side of the vibration transmission plate is in contact with the side wall of the target motor 10, and the first side and the second side of the vibration transmission plate are arranged relative to each other, such as the upper and lower sides, the left and right sides, or the front and back sides. The vibration transmission plate can transmit the sound wave energy generated by the audio player component 300 to the target motor 10 by solid conduction, and the structure of the vibration transmission plate is simple and easy to assemble and use. Or, in other application examples, the vibration transmission component 200 is a fixture provided with a test position, and the test position is suitable for placing the target motor 10, and the test position is convenient for positioning and fixing the target motor 10.

[0066] It should be noted that the test purpose of this embodiment is to detect whether the rotating shaft of the target motor 10 is poorly assembled. The related technology usually performs detection by artificial listening when the target motor 10 is in operation. This method mainly achieves the purpose of detection by simulating the actual working conditions of the target motor 10. However, the detection method of the related technology places the target motor 10 in a static state, that is, the position of the target motor 10 in the placed state is fixed, but in actual applications, the target motor 10 may move or flip with the product in which it is located. The artificial listening method can only detect whether there is a problem of poor assembly of parts when the target motor 10 is in one or several positions.

[0067] In this embodiment, the rotation of the target motor 10 is controlled by the rotating drive component 100 (there is no need to start the target motor 10 to simulate the actual working condition), and different postures of the target motor 10 can be detected. The energy fluctuation generated by the audio playback component 300 when playing the sound is transmitted to the target motor 10 through the vibration transmission component 200. If the target motor 10 has poor parts assembly, the energy fluctuation will cause the target motor 10 to resonate, thereby causing the target motor 10 to emit abnormal sounds. The audio acquisition component 400 collects sound signals and analyzes the sound signals. It can be determined whether there are abnormal sounds during the rotation of the target motor 10, and then it can be determined whether there is a problem of poor parts assembly of the target motor 10. The detection efficiency is high and the detection is accurate.

[0068] During the rotation of the target motor 10, the sound played by the audio player component 300 is a frequency sweep signal (a continuous signal whose frequency changes with time) with a known frequency set by the user. Exemplarily, the frequency sweep signal uses a pure tone signal with a changing frequency. The sound played by the audio player component 300 can be transmitted through the vibration transmission component 200 or through air vibration transmission, so as to be collected by the audio collection component 400. If the target motor 10 has a problem of poor assembly of parts, then under a sound signal of a certain frequency, the energy fluctuation of the sound signal will cause the target motor 10 to resonate and emit Rub & Buzz abnormal sound, that is, the sound signal collected by the audio collection component 400 will be doped with the signal component of Rub & Buzz abnormal sound. By analyzing the collected sound signal and determining whether the sound signal has an abnormal sound component, it can be determined whether the target motor 10 has a problem of poor assembly of parts. In this way, the abstract problem of poor assembly of parts can be converted into a more familiar audio analysis problem, which is conducive to reducing the difficulty of detection and facilitating the provision of quantifiable detection indicators.

[0069] It is worth mentioning that the target motor 10 is a small motor. In view of the small size and light weight of the small motor, the present embodiment adopts the audio playback component 300 as the resonance source of the target motor 10, which also has the advantage of small size. Moreover, the peripheral structure of the audio playback component 300 is simple and does not require large and complex equipment to drive it, which is conducive to the miniaturization design of the motor product abnormal sound test equipment. Moreover, the sound signal played by the audio playback component 300 has a wider frequency range, such as the frequency range that the human ear can hear (20Hz~20KHz). The frequency range of the audio playback component 300 is much wider than that of the mechanical vibration source (the vibration frequency is usually at the level of ten Hz or one hundred Hz, which cannot meet the test requirements), and can meet the test requirements; in addition, the audio playback component 300 hardly generates any noise signal when playing sound, which can reduce the interference factors of the test; in addition, the size of the mechanical vibration source is much larger than the size of the small motor, and cannot meet the test requirements of the small motor; the vibration direction of the mechanical vibration source is usually fixed to the horizontal or vertical direction, and the product under test is required to be stationary on the mechanical vibration source. When it is necessary to test the product under test in different postures, each posture can only be tested separately, that is, after testing one posture, the next posture is tested, and during the test, the vibration frequency of the mechanical vibration source is usually fixed (that is, it cannot change with time), which cannot be used to detect the resonant frequency of a small motor.

[0070] Please refer to Figure 2 and Figure 3 In order to accurately analyze whether there is an abnormal sound component in the sound signal, the control component includes an audio analysis module 550, which includes a plurality of HOHD analysis units 552, TD analysis units 553, THD analysis units 554, FR analysis units 555, and TE analysis units 556, a frequency domain conversion unit 551, and an abnormal sound determination unit 557. This embodiment can accurately and effectively determine whether there is an abnormal sound component in the sound signal by performing multi-dimensional analysis through HOHD, TD, THD, FR, and TE.

[0071] Among them, the frequency domain conversion unit 551 is used to perform frequency domain conversion on the sound signal to obtain a spectrum curve. For example, the collected sound signal is a time domain signal that changes with time. The frequency domain conversion unit 551 performs Fourier transformation on the sound signal to convert the sound signal from the time domain to the frequency domain, so as to facilitate subsequent spectrum analysis. The HOHD analysis unit 552 is used to perform high-order harmonic distortion analysis on the spectrum curve to obtain a first analysis result, the TD analysis unit 553 is used to perform total distortion analysis on the spectrum curve to obtain a second analysis result, the THD analysis unit 554 is used to perform total harmonic distortion analysis on the spectrum curve to obtain a third analysis result, the FR analysis unit 555 is used to perform frequency response analysis on the spectrum curve to obtain a fourth analysis result, the TE analysis unit 556 is used to perform total harmonic energy distortion analysis on the spectrum curve to obtain a fifth analysis result, and the abnormal sound determination unit 557 is used to determine whether the target motor 10 has abnormal sound according to multiple of the first analysis result, the second analysis result, the third analysis result, the fourth analysis result and the fifth analysis result.

[0072] Please refer to Figure 2 , the control component also includes a main control module 510 and a drive module 520, an audio transmission module 530 and an audio sampling module 540 respectively connected to the main control module 510. Exemplarily, the control component can use an electronic computer, the main control module 510 can be a motherboard in the electronic computer, the drive module 520 can be a programmable controller (PLC) of the servo motor, and the audio transmission module 530 and the audio sampling module 540 can be modules integrated in the sound card. The audio analysis module 550 can be a software application in the electronic computer, or the audio analysis module 550 can be an integrated hardware circuit module. The main control module 510 is used to coordinate the drive module 520, the audio transmission module 530 and the audio sampling module 540. The drive module 520 is used to drive the rotation drive component 100 to move, the audio transmission module 530 is used to send the sweep frequency signal to the audio playback component 300, and the audio sampling module 540 is used to receive the sound signal from the audio acquisition component 400 and send the sound signal to the audio analysis module 550.

[0073] Please refer to Figure 4 This embodiment also provides a motor product abnormal sound test method, which is applied to the above motor product abnormal sound test equipment, including steps S100~S500. It should be noted that the steps in this embodiment are numbered only for the convenience of review and understanding, and do not limit the execution order of the steps. Please refer to Figure 1 , the following is a detailed description of each step:

[0074] S100, placing the target motor 10 in the test area, and connecting the rotating shaft of the target motor 10 to the rotation drive assembly 100;

[0075] Exemplarily, the rotation drive assembly 100 uses a servo motor assembly, and the rotating shaft of the target motor 10 is connected to the output shaft of the servo motor assembly, or the rotating shaft of the target motor 10 is connected to the output shaft of the servo motor assembly through a reducer. In this way, the rotation drive assembly 100 can drive the target motor 10 to rotate, so that different positions of the target motor 10 abut against the vibration transmission assembly 200.

[0076] S200, the control component drives the target motor 10 to rotate around its own rotation axis through the rotation drive component 100;

[0077] Exemplarily, the target motor 10 is coaxially arranged with the rotation drive assembly 100, and the rotation of the output shaft of the rotation drive assembly 100 can drive the rotation axis of the target motor 10 to rotate, thereby driving the target motor 10 to rotate around its own rotation axis. During the rotation process, the target motor 10 remains in contact with the vibration transmission assembly 200. Alternatively, in some application examples, the rotation angle of the target motor 10 is a plurality of discrete angles, such as 0°, 30°, 60°, 90°, etc. If the shape of the target motor 10 is an irregular columnar structure, the target motor 10 should be in contact with the vibration transmission assembly 200 when it rotates to the rotation angle to be measured.

[0078] S300, during the rotation of the target motor 10, the control component sends a sweep frequency signal of a preset frequency band to the audio playing component 300, so that the audio playing component 300 transmits the energy fluctuation generated by the playing sound to the target motor 10 through the vibration transmission component 200;

[0079] Exemplarily, the target motor 10 of this embodiment is a small motor with the characteristics of small size and light weight. By reasonably configuring the audio playback power of the audio playback component 300 and selecting a vibration transmission component 200 with a suitable thickness, the energy fluctuations generated by the audio playback component 300 playing the sound can be transmitted to the target motor 10 through the vibration transmission component 200 in a solid conduction manner, thereby causing the resonance of the target motor 10 under certain frequency energy fluctuations. Resonance refers to the phenomenon that when the frequency of the excitation (such as the energy fluctuations generated by playing the sound) of the mechanical system (such as the target motor 10) is close to a certain order of the natural frequency of the system, the amplitude of the system increases significantly. Among them, the control component sends a continuous sweep signal with a frequency range of 500~2000Hz and a change interval of 1 / 12 octave to the audio playback component 300. Before the test, it is unknown whether there is an assembly problem with the target motor 10 and at what frequency the abnormal sound generated by the target motor 10 is manifested. Therefore, it is necessary to send a sweeping frequency signal with a wider frequency range to the target motor 10. The frequency change interval of the sweeping frequency signal is 1 / 12 octave, which can make the frequency precision of the sweeping frequency signal higher and meet the detection requirements. It should be noted that during the initial detection, the frequency band of the sweeping frequency signal can be configured to a wider range. After preliminarily determining the frequency band of the abnormal sound signal of the target motor 10, the frequency band of the sweeping frequency signal can be configured to a narrower range, such as 800~1200Hz, so as to perform more accurate detection and analysis.

[0080] S400, the control component collects sound signals through the audio collection component 400;

[0081] Exemplarily, in order to reduce the interference of environmental noise, the target motor 10 is usually enclosed in a relatively quiet environment (such as a soundproof room or a soundproof chamber) for testing. In theory, for a good motor, the sound signal collected by the audio acquisition component 400 includes the sound signal played by the audio playback component 300, while for a defective motor, the sound signal collected by the audio acquisition component 400 includes both the sound signal played by the audio playback component 300 and the abnormal sound signal generated by the resonance of the target motor 10.

[0082] S500 , the control component analyzes the sound signal to determine whether there is an abnormal sound during the rotation of the target motor 10 according to the sound signal.

[0083] In this embodiment, the rotation of the target motor 10 is controlled by the rotating drive component 100, and different postures of the target motor 10 can be detected. The energy fluctuation generated by the audio playback component 300 when playing the sound is transmitted to the target motor 10 through the vibration transmission component 200. If the target motor 10 has poor parts assembly, the energy fluctuation will cause the target motor 10 to resonate, thereby making the target motor 10 emit abnormal sounds. The sound signal is collected by the audio acquisition component 400 and analyzed. It can be determined whether there is abnormal sound during the rotation of the target motor 10, and then it can be determined whether there is a problem of poor parts assembly of the target motor 10. The detection efficiency is high and the detection is accurate.

[0084] Step S500: the control component analyzes the sound signal to determine whether there is abnormal sound during the rotation of the target motor 10 according to the sound signal, including:

[0085] S510, the control component performs frequency domain transformation on the sound signal to obtain a frequency spectrum curve;

[0086] S520, the control component performs multiple HOHD analysis, TD analysis, THD analysis, FR analysis and TE analysis on the spectrum curve to obtain multiple analysis results;

[0087] S530 , the control component determines whether the target motor 10 has abnormal noise during rotation according to the multiple analysis results.

[0088] Exemplarily, the sound signal is a time domain signal that changes with time. The control component converts the sound signal from the time domain to the frequency domain through Fourier transform to obtain a spectrum curve for subsequent spectrum analysis. Among them, the abnormal sound generated by the target motor 10 of this embodiment is similar to the Rub & Buzz abnormal sound test in the acoustic test. Therefore, by performing multi-dimensional analysis of the spectrum curve through HOHD analysis, TD analysis, THD analysis, FR analysis and TE analysis, it is possible to more accurately analyze whether the target motor 10 has abnormal sound. For example, Figures 5 to 8 The graphs of good motors and defective motors under different analyses are shown. The curve marked L1 in the figure represents the curve of good motors, and the curve marked L2 represents the curve of defective motors. The unit of the horizontal axis is Hz (Hertz). Figure 5 The graph of HOHD analysis is shown. The unit of the ordinate is percentage. The curves of good motors and bad motors are significantly different at the position indicated by P in the figure. Therefore, by reasonably setting the HOHD abnormal sound threshold (such as Figure 5 As shown by the mark L3 in the figure), it is possible to detect whether the target motor 10 has abnormal sound; Figure 6 The graph shown is the TD analysis, the unit of the vertical axis is 1, Figure 7 The graph shown is a THD analysis graph, with the vertical axis in percentage. Figure 8 The graph of FR analysis is shown in Figure 1, with the vertical axis in dB. Figures 6 to 8 It can be seen that there is not much difference between good motors and defective motors in TD, THD and FR dimensions. Therefore, multi-dimensional analysis of the spectrum curve is conducive to improving the accuracy of detection. For example, when any of the multiple analysis results obtained by HOHD analysis, TD analysis, THD analysis, FR analysis and TE analysis exceeds the corresponding abnormal sound threshold, it can be determined that the target motor has abnormal sound during rotation.

[0089] In some application examples, the motor product abnormal noise test method also includes:

[0090] S610, when there is an abnormal sound in the target motor 10, the control component determines the angular position of the target motor 10 according to the frequency of the abnormal sound;

[0091] For example, determining the angular position of the target motor 10 by the frequency of the abnormal sound can provide a data basis for the subsequent maintenance of the target motor 10, thereby improving the convenience and pertinence of the maintenance. Step S610 includes:

[0092] S611, when the target motor 10 has an abnormal sound, the control component determines the frequency of the abnormal sound;

[0093] S612, determining the occurrence time of the abnormal sound according to the frequency of the abnormal sound and the frequency sweep signal;

[0094] S613 , determining the angular position of the target motor 10 at which the abnormal sound occurs according to the occurrence time of the abnormal sound and the rotation speed of the target motor 10 .

[0095] For example, in Figures 5 to 8 In the curve graph shown, according to the corresponding threshold, the frequency corresponding to the position on the curve that exceeds the threshold (i.e., the abnormal sound) can be determined, and the sweep signal is a continuous signal that changes with time. The abnormal sound generated by the target motor 10 is caused by resonance, and the frequency of the abnormal sound can be approximately equivalent to the frequency of the sweep signal that causes the resonance of the target motor 10. Since the sweep signal is a preset time domain signal, the corresponding relationship between the frequency and time of the sweep signal is known. According to the frequency of the abnormal sound, the corresponding frequency (equal or similar frequency) is found in the sweep signal to determine the time when the abnormal sound occurs. The rotation angle of the target motor 10 is also the time domain data obtained by the rotation speed changing with time. According to the time when the abnormal sound occurs and the rotation speed of the target motor 10, the angle position of the target motor 10 where the abnormal sound occurs, i.e., the posture of the target motor 10, can be determined, so as to facilitate the subsequent reproduction of the problem of the target motor 10.

[0096] Or, in other application examples, the motor product abnormal noise test method also includes:

[0097] S620: When an abnormal sound is generated in the target motor 10, the control component determines an angular position interval of the target motor 10 according to a frequency range of the abnormal sound.

[0098] For example, the frequency of the abnormal sound is usually difficult to determine accurately. The frequency range of the abnormal sound can be determined by setting a threshold, and then the angular position interval of the target motor 10 can be determined according to the frequency range of the abnormal sound to facilitate further analysis. For example, the rotation angle of the target motor 10 and the frequency range of the sweep signal can be reasonably set to more accurately detect the frequency of the abnormal sound or narrow the frequency range of the abnormal sound.

[0099] Wherein, step S620 includes:

[0100] S621, when the target motor 10 has an abnormal sound, the control component determines a frequency range of the abnormal sound;

[0101] S622, determining the occurrence period of the abnormal sound according to the frequency range of the abnormal sound and the frequency sweep signal;

[0102] S623 , determining the angular position interval in which the abnormal sound occurs in the target motor 10 according to the occurrence time period of the abnormal sound and the rotation speed of the target motor 10 .

[0103] Exemplarily, the frequency range of the abnormal sound can be a continuous frequency interval or multiple discrete frequency intervals. The occurrence period of the abnormal sound is determined according to the boundary values ​​of the frequency range of the abnormal sound (such as the maximum and minimum values ​​of the frequency interval), and then the angular position interval of each target motor 10 where the abnormal sound occurs is determined.

[0104] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A motor product abnormal noise testing device, suitable for testing a target motor (10), characterized in that: include: A rotation drive assembly (100) used to connect to the rotating shaft of the target motor (10), wherein the area where the target motor (10) is located is a test area; a vibration transmission component (200) abutting against the target motor (10), wherein the rotation drive component (100) adopts a servo motor component, the output shaft of the servo motor component is connected to the rotation shaft of the target motor (10), the servo motor component drives the rotation shaft of the target motor (10) to rotate, thereby driving the target motor (10) to rotate, so that the target motor (10) and the servo motor component rotate coaxially, so that different positions of the target motor (10) can abut against the vibration transmission component (200); An audio playback component (300) having a sound playback end, the audio playback component (300) being connected to the vibration transmission component (200), and the sound playback end facing the vibration transmission component (200); An audio collection component (400) is arranged in the test area, and the audio collection component (400) is used to collect sound signals; A control component is electrically connected to the rotation drive component (100), the audio playback component (300) and the audio collection component (400), respectively, and is used to control the rotation drive component (100) to drive the target motor (10) to rotate, and to send a sweep frequency signal of a preset frequency band whose frequency varies with time to the audio playback component (300), and to collect a sound signal through the audio collection component (400) so as to determine whether the target motor (10) has an abnormal sound during rotation based on the sound signal.

2. The motor product abnormal noise testing equipment according to claim 1 is characterized in that: The audio playing component (300) and the test area are distributed on two opposite sides of the vibration transmission component (200), and the position of the audio playing component (300) is adapted to the test area.

3. The motor product abnormal noise testing equipment according to claim 1 or 2, characterized in that: The vibration transmission component (200) is a vibration transmission plate, the audio playback component (300) is connected to a first side of the vibration transmission plate, and a second side of the vibration transmission plate abuts against a side wall of the target motor (10).

4. The motor product abnormal noise testing equipment according to claim 1 is characterized in that: The control component comprises an audio analysis module (550), the audio analysis module (550) comprising a plurality of a HOHD analysis unit (552), a TD analysis unit (553), a THD analysis unit (554), a FR analysis unit (555) and a TE analysis unit (556), a frequency domain conversion unit (551) and an abnormal sound determination unit (557), the frequency domain conversion unit (551) being used to perform frequency domain conversion on the sound signal to obtain a frequency spectrum curve; the HOHD analysis unit (552) being used to perform high-order harmonic distortion analysis on the frequency spectrum curve to obtain a first analysis result, and the TD analysis unit (553) being used to perform high-order harmonic distortion analysis on the frequency spectrum curve to obtain a first analysis result. The curve is used for performing a total distortion analysis on the frequency spectrum curve to obtain a second analysis result, the THD analysis unit (554) is used for performing a total harmonic distortion analysis on the frequency spectrum curve to obtain a third analysis result, the FR analysis unit (555) is used for performing a frequency response analysis on the frequency spectrum curve to obtain a fourth analysis result, the TE analysis unit (556) is used for performing a total harmonic energy distortion analysis on the frequency spectrum curve to obtain a fifth analysis result, and the abnormal sound determination unit (557) is used for determining whether the target motor (10) has an abnormal sound according to a plurality of the first analysis result, the second analysis result, the third analysis result, the fourth analysis result and the fifth analysis result.

5. The motor product abnormal noise testing equipment according to claim 4 is characterized in that: The control component further comprises a main control module (510), and a driving module (520), an audio sending module (530), and an audio sampling module (540) respectively connected to the main control module (510).

6. A method for testing abnormal noise of a motor product, applied to the abnormal noise testing device of a motor product as claimed in any one of claims 1 to 5, characterized in that: include: Placing a target motor (10) in the test area, and connecting the rotating shaft of the target motor (10) to the rotary drive assembly (100); The control component drives the target motor (10) to rotate around its own rotation axis through the rotation drive component (100); During the rotation of the target motor (10), the control component sends a sweep frequency signal of a preset frequency band to the audio playback component (300), so that the audio playback component (300) transmits the energy fluctuation generated by the played sound to the target motor (10) through the vibration transmission component (200); The control component collects sound signals through the audio collection component (400); The control component analyzes the sound signal to determine whether abnormal sound is present during the rotation of the target motor (10) based on the sound signal.

7. The method for testing abnormal noise of motor products according to claim 6, characterized in that: The control component sends a sweep frequency signal of a preset frequency band to the audio playback component (300), comprising: The control component sends a continuous frequency sweep signal with a frequency range of 500-2000 Hz and a variation interval of 1 / 12 octave to the audio playback component (300).

8. The method for testing abnormal noise of motor products according to claim 6, characterized in that: The control component analyzes the sound signal to determine whether the target motor (10) has abnormal sound during rotation according to the sound signal, including: The control component performs frequency domain transformation on the sound signal to obtain a frequency spectrum curve; The control component performs multiple analysis of HOHD analysis, TD analysis, THD analysis, FR analysis and TE analysis on the spectrum curve to obtain multiple analysis results; The control component determines whether the target motor (10) has abnormal noise during rotation based on the multiple analysis results.

9. The method for testing abnormal noise of a motor product according to claim 6, 7 or 8, characterized in that: The motor product abnormal sound testing method also includes: In the case where the target motor (10) has an abnormal sound, the control component determines the angular position of the target motor (10) according to the frequency of the abnormal sound; Alternatively, in the case where the target motor (10) has an abnormal sound, the control component determines the angular position interval of the target motor (10) based on the frequency range of the abnormal sound.

10. The method for testing abnormal noise of motor products according to claim 9, characterized in that: When the target motor (10) has an abnormal sound, the control component determines the angular position of the target motor (10) according to the frequency of the abnormal sound, including: In the case where the target motor (10) has an abnormal sound, the control component determines the frequency of the abnormal sound; Determining the occurrence time of the abnormal sound according to the frequency of the abnormal sound and the frequency sweep signal; Determining the angular position at which the abnormal sound occurs in the target motor (10) according to the time at which the abnormal sound occurs and the rotation speed of the target motor (10); Alternatively, when the target motor (10) has an abnormal sound, the control component determines the angular position interval of the target motor (10) according to the frequency range of the abnormal sound, including: In the case where the target motor (10) has an abnormal sound, the control component determines a frequency range of the abnormal sound; Determining the occurrence period of the abnormal sound according to the frequency range of the abnormal sound and the frequency sweep signal; According to the time period in which the abnormal sound occurs and the rotation speed of the target motor (10), the angular position interval in which the abnormal sound occurs in the target motor (10) is determined.

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