Motor vibration noise performance test system and test method

Abstract

The invention discloses a motor vibration noise performance test system and test method, the system comprises a test bench, a support, a motor tool seat and a load torque device, and the top of the test bench is provided with a flat acoustic reflection bench surface; the support is of a hemisphere frame structure and is arranged on the acoustic reflection table top, and a plurality of microphones facing the sphere center of the support are evenly distributed on the hemisphere face of the support. The motor tool seat is arranged on the acoustic reflection table top and located at the sphere center of the support, and a plurality of force sensors are evenly distributed between the motor tool seat and the acoustic reflection table top. The load torque device comprises a bottom frame, a brake, a torque sensor and a transmission shaft, the brake is installed on the bottom frame, the torque sensor is connected between the brake and the transmission shaft, and the upper end of the transmission shaft penetrates through the acoustic reflection table top and then is detachably and coaxially connected with the output end of the tested motor. The system can meet the synchronous test of the operation noise and the structural load when the motor is loaded, and meets the test requirement of the sound power in the acoustic test.

Description

Technical Field

[0001] The present invention relates to the technical field of noise detection, and in particular to a motor vibration noise performance testing system and a testing method. Background Art

[0002] With the popularization of motor detection technology, it is possible to detect whether the noise and structural load emitted by the motor when it is powered on can meet the requirements under a given environment, so that motors that do not meet the conditions can be eliminated and the quality of the device can be ensured. However, the existing motor detection devices still have the following problems: it is difficult to take into account the needs of matching working state noise testing and structural load testing when the motor is loaded, and it is easily affected by other vibration sources. Summary of the invention

[0003] The object of the present invention is to provide a motor vibration and noise performance testing system and testing method to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0004] The technical solutions adopted to solve the above technical problems are:

[0005] The present invention provides a motor vibration and noise performance testing system, comprising:

[0006] Test bench with a flat acoustic reflection surface on top;

[0007] The bracket is a hemispherical bracket structure with an opening facing downward, the bracket is arranged on the acoustic reflection table, and a plurality of microphones facing the center of the bracket are evenly distributed on the hemispherical surface of the bracket;

[0008] A motor fixture seat is arranged on the acoustic reflection table and located at the spherical center of the bracket, a plurality of force sensors are evenly distributed between the motor fixture seat and the acoustic reflection table, and the motor fixture seat is used to install the motor to be tested;

[0009] The load torque device includes a base frame, a brake, a torque sensor and a transmission shaft. The base frame is located below the acoustic reflection table, the brake is installed on the base frame, the torque sensor is connected between the brake and the transmission shaft, and the upper end of the transmission shaft passes through the acoustic reflection table and is detachably coaxially connected to the output end of the motor under test.

[0010] The motor vibration and noise performance testing system of the present invention has the following beneficial effects:

[0011] When in use, a preset load is provided to the motor under test through the brake. Under different loads of the motor under test, the output torque and speed of the motor under test are detected by the torque sensor, the noise generated by the operation of the motor under test is detected by multiple microphones, and the structural load of the motor under test, that is, the rigid constraint force of the motor under test, is detected by multiple force sensors to detect the operating vibration of the motor under test. This system can meet the synchronous testing of operating noise and structural load when the motor is loaded, and all microphones are installed on the spherical surface of the bracket of the hemispherical frame structure, which can keep all microphones pointing to the center of the sphere and maintain the distance between the microphone and the center of the sphere. Under the action of the acoustic reflection table, the test requirements of sound power in acoustic testing are met, thereby improving the accuracy of operating noise testing.

[0012] As a further improvement of the above technical solution, a spline shaft groove is provided at the upper end of the transmission shaft, a spline shaft body is slidably sleeved on the spline shaft groove, and the upper end of the spline shaft body is connected to the motor under test.

[0013] The drive shaft in this scheme is a combined shaft structure that fits together. The spline shaft is connected to the motor under test, and the spline shaft is slidably inserted into the spline shaft groove of the drive shaft. It can be understood that for different output ends of the motor under test, the axial position of the spline shaft in the spline shaft groove can be adjusted without replacing the entire drive shaft. In this way, it can be adapted to the output ends of different motors under test to meet the testing requirements of motors of various types and sizes.

[0014] As a further improvement of the above technical solution, the bracket includes a bottom ring and multiple longitudinal rods. The longitudinal rods are in the shape of arc rods and are distributed radially in an umbrella shape. The upper ends of the multiple longitudinal rods are connected to each other, and the lower ends of the multiple longitudinal rods are connected to the bottom ring. Each of the longitudinal rods is provided with multiple microphones at adjustable intervals.

[0015] According to different test requirements, the distance and number of microphones on each vertical rod can be adjusted. The microphones can be fixed by multiple arc-shaped vertical rods to reduce the reflection of sound waves and improve the accuracy of the test.

[0016] As a further improvement of the above technical solution, the bottom ring includes a plurality of arc-shaped cross bars, two adjacent cross bars are connected with supporting feet, and the lower ends of the longitudinal bars are connected to the supporting feet;

[0017] The bracket also includes a center plate, and the upper ends of the plurality of longitudinal rods are connected to the outer periphery of the center plate in an annular manner. A central slot hole penetrating vertically is provided at the center of the center plate, and the microphone is coaxially provided in the central slot hole.

[0018] When assembling the bracket, two adjacent horizontal bars and one longitudinal bar are connected together through the supporting feet, and the upper ends of multiple longitudinal bars are connected together through the center plate, which is convenient for assembly. The microphone located in the center slot is vertically arranged downward and points to the center of the sphere. It is the microphone at the 10th point of the national standard 10-point method.

[0019] As a further improvement of the above technical solution, the longitudinal rod is provided with a plurality of slide seats, the slide seats are slidably arranged along the longitudinal rod, the slide seats are hinged with a mounting clip, and the microphone clip is mounted on the mounting clip.

[0020] When in use, the microphone is mounted on the mounting clamp, wherein the mounting clamp can rotate relative to the slide seat to adjust the direction of the microphone, and the slide seat is slidably arranged on the longitudinal rod to adjust the position of the microphone on the spherical surface.

[0021] As a further improvement of the above technical solution, the base frame is connected to a plurality of vertically arranged columns, the lower ends of the columns are fixedly connected to the base frame, and a detachable component is provided between the upper ends of the columns and the acoustic reflection table top, and the detachable component is used to maintain and disconnect the rigid connection between the upper ends of the columns and the acoustic reflection table top.

[0022] When clamping the motor under test, in order to ensure the coaxiality between the motor under test, the brake, the torque sensor and the transmission shaft, the upper end of the column is kept rigidly connected to the acoustic reflection table through a detachable component, and the base frame and the acoustic reflection table are positioned through multiple columns to ensure the coaxiality of each transmission component. After the position is determined, that is, the motor under test is installed, the rigid connection between the upper end of the column and the acoustic reflection table is disconnected through the detachable component. At this time, the motor under test is only connected to the brake below through the transmission shaft, so that the coaxiality requirement can be met and the influence of other vibration sources can also be isolated.

[0023] As a further improvement of the above technical solution, the acoustic reflection table top is provided with a plurality of countersunk holes corresponding one by one to the plurality of columns, and the detachable component comprises a sleeve and a cover, the sleeve is used to be detachably mounted on the countersunk holes and detachably connected to the upper ends of the columns, and the cover is used to detachably seal and cover the countersunk holes to keep the acoustic reflection table top flat.

[0024] This solution uses a sleeve to achieve a rigid connection between the column and the acoustic reflection table top. When the sleeve is detachably mounted on the countersunk hole, it is also mounted on the upper end of the column. When it is necessary to disconnect the rigid connection between the upper end of the column and the acoustic reflection table top, the sleeve is removed and a sleeve cover is then mounted on the countersunk hole to ensure the flatness of the acoustic reflection table top.

[0025] As a further improvement of the above technical solution, the acoustic reflection table surface includes a motor mounting platen and a plurality of spliced ​​platens located around the motor mounting platen, the plurality of spliced ​​platens are spliced ​​together in a ring shape to form a step groove for mounting the motor mounting platen, the motor tooling seat and the plurality of countersunk holes are provided with the motor mounting platen, and the motor mounting platen is provided with an axial hole for the transmission shaft to pass through.

[0026] The acoustic reflection table of this scheme is assembled by multiple splicing tables and motor mounting tables, which improves the flexible installation of the system and facilitates transportation. During assembly, multiple splicing tables are seamlessly spliced ​​together in a ring shape, and a step groove is formed in the middle between them. Then the motor mounting table is inserted into the step groove to form a flat acoustic reflection table. The transmission shaft passes through the acoustic reflection table through the axial hole of the motor mounting table. The motor tooling seat is installed on the motor mounting table through multiple force sensors. At this time, it is only necessary to ensure the relative position between the motor mounting table and the base frame to ensure the coaxiality of each transmission component.

[0027] As a further improvement of the above technical solution, the bottom of each spliced ​​table plate is connected to a stand, and the bottoms of the stand and the base frame are provided with pulley assemblies. Both the base frame and the stand are made of lightweight aluminum profiles, and the pulley assembly is arranged for easy transportation.

[0028] The present invention also provides a method for testing the vibration and noise performance of a motor, comprising the following steps:

[0029] Using the motor vibration and noise performance testing system;

[0030] Maintaining the upper end of the column in rigid connection with the acoustic reflection tabletop through the detachable component;

[0031] The motor to be tested is mounted on the acoustic reflection table and arranged at the spherical center of the bracket through the motor fixture seat;

[0032] Coaxially connecting the upper end of the transmission shaft and the output end of the motor under test;

[0033] Disconnecting the rigid connection between the upper end of the column and the acoustic reflection tabletop through the detachable component;

[0034] Controlling the operation of the motor under test according to preset parameters, and outputting a preset load to the motor under test through a brake;

[0035] The output torque and rotation speed of the motor under test are detected by a torque sensor, the noise generated by the operation of the motor under test is detected by multiple microphones, and the structural load of the motor under test is detected by multiple force sensors. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments;

[0037] Figure 1 This is a structural schematic diagram of an embodiment of a motor vibration and noise performance testing system provided by the present invention;

[0038] Figure 2 yes Figure 1 A partial enlarged view of part A;

[0039] Figure 3 yes Figure 1 A partial enlarged view of part B;

[0040] Figure 4 is an exploded view of an embodiment of the test bench provided by the present invention;

[0041] Figure 5 yes Figure 4 A partial enlarged view of part C in the middle;

[0042] Figure 6 This is a schematic diagram of a load torque device provided by the present invention, in which a motor under test is assembled in one embodiment;

[0043] Figure 7 is a cross-sectional view of a load torque device provided by the present invention, in which a motor under test is assembled in one embodiment;

[0044] Figure 8 It is a partial cross-sectional view of the sleeve cover provided by the present invention when the sleeve cover is arranged in the countersunk hole;

[0045] Fig. 9 The present invention provides a method for testing the vibration and noise performance of a motor, and a flow chart of an embodiment thereof;

[0046] Figure Number:

[0047] Test bench 100; acoustic reflection table 110; motor mounting table 111; shaft hole 1111; splicing table 112; step groove 113; stand 114; countersunk hole 115;

[0048] Bracket 200; microphone 210; bottom ring 220; crossbar 221; support leg 222; longitudinal bar 230; slide seat 231; mounting clip 232; center plate 240; center slot 241;

[0049] Motor tooling seat 300;

[0050] Load torque device 400; chassis 410; column 411; brake 420; torque sensor 430; transmission shaft 440; spline shaft groove 441; spline shaft body 442;

[0051] Motor under test 500;

[0052] Force sensor 600;

[0053] Sleeve 700;

[0054] Cover 800. DETAILED DESCRIPTION

[0055] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0056] 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.

[0057] In the description of the present invention, if there are words such as "several", it means one or more, "more" means more than two, greater than, less than, exceed, etc. are understood as not including the number, and above, below, within, etc. are understood as including the number.

[0058] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0059] Reference Figures 1 to 8 The motor vibration and noise performance testing system of the present invention is implemented as follows:

[0060] like Figure 1 and Figure 6 As shown, the motor vibration and noise performance testing system according to the embodiment of the present invention includes a test bench 100 , a bracket 200 , a motor fixture seat 300 , a load torque device 400 and a motor 500 to be tested.

[0061] An acoustic reflection tabletop 110 is disposed on the top of the test bench 100 , and the acoustic reflection tabletop 110 is disposed horizontally.

[0062] The bracket 200 is a hemispherical structure, the opening of the bracket 200 is set downward, the mounting cover of the bracket 200 is set on the acoustic reflection table 110, and a plurality of microphones 210 pointing to the center of the bracket 200 are evenly distributed on the hemispherical surface of the bracket 200.

[0063] The motor fixture seat 300 is disposed on the acoustic reflection table 110 and is located at the center of the bracket 200. Figure 6 and Figure 7 As shown, a plurality of force sensors 600 are evenly distributed between the motor fixture seat 300 and the acoustic reflection table 110, and the plurality of force sensors 600 are arranged in a ring-shaped interval. In this embodiment, three force sensors 600 are arranged, and in other embodiments, four or more force sensors 600 may be arranged. The motor 500 to be tested is installed on the motor fixture seat 300. The force sensor 600 of the embodiment of the present invention has a measurement range of 0 to 20 KN and a measurement accuracy of ±1.5% FS, which meets the test requirements for structural loads in acoustic test experiments.

[0064] like Figure 6 and Figure 7 As shown, the load torque device 400 of this embodiment includes a base frame 410, a brake 420, a torque sensor 430 and a transmission shaft 440, wherein the base frame 410 is arranged below the acoustic reflection table 110, the brake 420 is installed on the base frame 410, the torque sensor 430 is connected between the brake 420 and the transmission shaft 440, the transmission shaft 440 is vertically arranged, and the upper end of the transmission shaft 440 passes through the acoustic reflection table 110 and is detachably coaxially connected to the output end of the motor 500 under test.

[0065] The brake 420 of this embodiment adopts a hysteresis brake. During the test process, the motor 500 under test must simulate the working conditions of actual application. Therefore, the brake 420 provides load torque to the motor 500 under test. The brake 420 is controlled by PLC, which can control the torque of the hysteresis reducer and display it in real time through the torque sensor 430. It can ensure that the output of its torque is smooth and linear, not affected by the change of speed slip, and can output according to the specified torque or customized variable torque output. The output torque range of the brake 420 of the embodiment of the present invention is 0-30Nm; the maximum speed is 3000rpm; the maximum power is 200w, which can meet the acoustic performance test requirements of small motors commonly used in vehicles. The torque sensor 430 (built-in encoder) of the embodiment of the present invention is coaxially connected to the brake 420 through a coupling. The torque signal and speed signal of the torque sensor 430 can be connected to the LMS data acquisition system and can be collected. The encoder output signal is approximately a square wave signal, which can be directly input into the LMS speed channel for speed testing. The two cooperate with each other and add PID control to accurately control the load value. The range of the torque sensor 430 is 0-30Nm; the maximum speed is 3000; the accuracy is 0.1%. The speed is 2000 pulses / rev, and the quality accuracy is reliable.

[0066] The embodiment of the present invention provides a preset load to the motor 500 under test through the brake 420. Under different loads of the motor 500 under test, the output torque and rotation speed of the motor 500 under test are detected through the torque sensor 430, the noise generated by the operation of the motor 500 under test is detected through multiple microphones 210, and the structural load of the motor 500 under test, that is, the rigid constraint force of the motor 500 under test, is detected through multiple force sensors 600 to detect the operating vibration of the motor 500 under test. This system can meet the synchronous test of the operating noise and structural load when the motor is loaded, and all microphones 210 are installed on the spherical surface of the bracket 200 of the hemispherical frame structure, which can keep all microphones 210 pointing to the center of the sphere and keep the distance between the microphone 210 and the center of the sphere. Under the action of the acoustic reflection table 110, the test requirements of the sound power in the acoustic test are met, thereby improving the accuracy of the operating noise test.

[0067] like Figure 1 As shown, the bracket 200 of the embodiment of the present invention includes a bottom ring 220 and a plurality of longitudinal rods 230, the longitudinal rods 230 are in the shape of arc rods, and the plurality of longitudinal rods 230 are distributed in a radial umbrella shape, the upper ends of the plurality of longitudinal rods 230 are connected to each other, and the lower ends of the plurality of longitudinal rods 230 are connected to the bottom ring 220, and each longitudinal rod 230 is provided with a plurality of microphones 210 at adjustable intervals. During testing, the distance and number of the microphones 210 on each longitudinal rod 230 can be adjusted according to different testing requirements, and the microphones 210 are fixed by the plurality of arc rod-shaped longitudinal rods 230 to reduce the reflection of sound waves and improve the accuracy of the test.

[0068] like Figure 1 and 2 As shown, the bottom ring 220 includes a plurality of arc-shaped cross bars 221, two adjacent cross bars 221 are connected with support legs 222, and the lower ends of the longitudinal bars 230 are connected to the support legs 222, as shown in FIG. Figure 1 and 3 As shown, the bracket 200 also includes a center plate 240, and the upper ends of multiple longitudinal rods 230 are connected to the outer periphery of the center plate 240 in a ring-shaped interval. A center slot 241 that passes through the center plate 240 from top to bottom is provided at the center of the center plate 240, and a microphone 210 is coaxially provided in the center slot 241. When the bracket 200 is assembled, two adjacent cross rods 221 and a longitudinal rod 230 are connected together through the support legs 222, and the upper ends of multiple longitudinal rods 230 are connected together through the center plate 240, which is convenient for assembly. The microphone 210 located in the center slot 241 is vertically arranged downward and points to the center of the sphere. It is the microphone 210 at the 10th point of the national standard 10-point method.

[0069] Furthermore, if Figure 2As shown, the longitudinal rod 230 is provided with a plurality of slides 231, and the slides 231 are slidably arranged along the longitudinal rod 230, and a mounting clamp 232 is hingedly connected to the slide 231, and the microphone 210 is clamped on the mounting clamp 232. When in use, the microphone 210 is mounted on the mounting clamp 232, wherein the mounting clamp 232 can rotate relative to the slide 231 to adjust the direction of the microphone 210, and the slide 231 is slidably arranged on the longitudinal rod 230 to adjust the position of the microphone 210 on the spherical surface, and a mounting clamp 232 is also arranged on the center plate 240.

[0070] like Figure 4 and Figure 5 As shown, the acoustic reflection table top 110 of the present embodiment includes a motor mounting platen 111 and a plurality of splicing plates 112 located around the motor mounting platen 111. In the present embodiment, four splicing plates 112 are provided, and the four splicing plates 112 are distributed in a rectangular shape. The four splicing plates 112 are spliced ​​together to form a step groove 113. It can be understood that a step notch is provided at the inner corner of the splicing platen 112, and the four step notches are spliced ​​to form a rectangular step groove 113, and the motor mounting plate 111 is matched and fitted in the step groove 113.

[0071] The acoustic reflection table 110 of the present embodiment is assembled by a plurality of splicing plates 112 and a motor mounting plate 111, which improves the flexible installation of the system and facilitates transportation. During assembly, the plurality of splicing plates 112 are seamlessly spliced ​​together in a ring shape, and a step groove 113 is formed in the middle between them. Then, the motor mounting plate 111 is inserted into the step groove 113 to form a flat acoustic reflection table 110, and the transmission shaft 440 passes through the acoustic reflection table 110 through the shaft hole 1111 of the motor mounting plate 111, and the motor tooling seat 300 is installed on the motor mounting plate 111 through a plurality of force sensors 600.

[0072] In addition, the bottom of each splicing table plate 112 is connected to a stand 114, and the bottoms of the stand 114 and the bottom of the base frame 410 are provided with pulley assemblies. The base frame 410 and the stand 114 are both made of lightweight aluminum profiles, and the setting of the pulley assembly is convenient for transportation.

[0073] like Figure 6 and 7 As shown, the base frame 410 of the embodiment of the present invention is connected to a plurality of vertically arranged columns 411, the lower ends of the columns 411 are fixedly connected to the base frame 410, and a detachable component is provided between the upper ends of the columns 411 and the acoustic reflection table top 110, and the detachable component is used to maintain and disconnect the rigid connection between the upper ends of the columns 411 and the acoustic reflection table top 110. In this embodiment, three columns 411 are provided, and the three columns 411 are distributed in a triangle.

[0074] When the motor 500 under test is clamped, in order to ensure the coaxiality between the motor 500 under test, the brake 420, the torque sensor 430 and the transmission shaft 440, the upper end of the column 411 is kept rigidly connected to the acoustic reflection table 110 through a detachable component, and the base frame 410 and the acoustic reflection table 110 are positioned through multiple columns 411 to ensure the coaxiality of each transmission component. After the position is determined, that is, the motor 500 under test is installed, the rigid connection between the upper end of the column 411 and the acoustic reflection table 110 is disconnected through the detachable component. At this time, the motor 500 under test is only connected to the brake 420 below through the transmission shaft 440, so that the coaxiality requirement can be met and the influence of other vibration sources can also be isolated.

[0075] Specifically, the acoustic reflection table 110 of this embodiment is provided with a plurality of countersunk holes 115 corresponding to the plurality of columns 411 one by one, and the countersunk holes 115 are arranged to be through-through from top to bottom, and the detachable component includes a sleeve 700 and a cover 800, wherein the sleeve 700 is used to be detachably sleeved on the countersunk holes 115 and detachably sleeved on the upper end of the column 411, and the cover 800 is used to detachably block and cover the countersunk holes 115 to keep the acoustic reflection table 110 flat. It can be understood that, if Figure 7 As shown, in this embodiment, the sleeve 700 is used to realize the rigid connection between the column 411 and the acoustic reflection table 110. When the sleeve 700 is detachably sleeved on the counterbore 115, it is also sleeved on the upper end of the column 411. When it is necessary to disconnect the rigid connection between the upper end of the column 411 and the acoustic reflection table 110, Figure 8 As shown, the sleeve 700 is removed, and then the cover 800 is placed on the countersunk hole 115 to ensure the flatness of the acoustic reflection table 110.

[0076] The countersunk hole 115 of this embodiment is arranged on the motor mounting plate 111 , and at this time, the coaxiality of each transmission component can be ensured by only ensuring the relative position between the motor mounting plate 111 and the base frame 410 .

[0077] Furthermore, if Figure 5 and Figure 7 As shown, a spline shaft groove 441 is provided at the upper end of the transmission shaft 440 , and a spline shaft body 442 is slidably sleeved on the spline shaft groove 441 , and the upper end of the spline shaft body 442 is connected to the output end of the motor 500 under test.

[0078] The transmission shaft 440 of the embodiment of the present invention is a combined shaft structure that fits together. The spline shaft body 442 is connected to the motor 500 under test, and the spline shaft body 442 is slidably inserted into the spline shaft groove 441 of the transmission shaft 440. It can be understood that for different output ends of the motor 500 under test, the axial position of the spline shaft body 442 in the spline shaft groove 441 can be adjusted without replacing the entire transmission shaft 440. In this way, it can be adapted to the output ends of different motors 500 under test to meet the testing requirements of motors of various types and sizes.

[0079] like Fig. 9 As shown, the present invention also provides a method for testing the vibration and noise performance of a motor, comprising the following steps:

[0080] Step S100: using a motor vibration and noise performance test system;

[0081] Step S200 : The upper end of the column 411 is kept rigidly connected to the acoustic reflection table 110 by a detachable component; the sleeve 700 is detachably sleeved on the counterbore 115 and is also sleeved on the upper end of the column 411 .

[0082] Step S300: The motor 500 to be tested is mounted on the acoustic reflection table 110 and is located at the center of the bracket 200 through the motor fixture seat 300;

[0083] Step S400: coaxially connecting the upper end of the transmission shaft 440 and the output end of the motor 500 to be tested;

[0084] Step S500 : disconnect the rigid connection between the upper end of the column 411 and the acoustic reflection table 110 through a detachable component; remove the sleeve 700 , and then seal the cover 800 on the countersunk hole 115 .

[0085] Step S600: controlling the motor 500 to run according to preset parameters, and outputting a preset load to the motor 500 through the brake 420;

[0086] Step S700: Detect the output torque and rotation speed of the motor 500 by the torque sensor 430, detect the noise generated by the operation of the motor 500 by multiple microphones 210, and detect the structural load of the motor 500 by multiple force sensors 600.

[0087] The embodiment of the present invention also includes a control system, which integrates all control and test requirements of the test system, including brake torque control, control of the motor 500 under test, indicator light and buzzer control as a safety protection system, sensor parameter acquisition and detection, data processing and analysis, and data export. The electrical components of the test system are installed in a high-voltage control cabinet and a computer cabinet, and the high and low currents are arranged separately. The electrical components in the control cabinet are arranged reasonably, the wiring is standardized, each electrical component has a corresponding identification label, and each cable has a casing line number, which is extremely convenient for installation and maintenance.

[0088] The control system is controlled by a computer, and the torque of the brake 420 can be controlled by PLC, the load of the motor 500 to be tested can be adjusted, and the alarm conditions of the indicator light and the buzzer can be controlled. If the current, voltage, torque and speed exceed the set value during the test, the equipment will automatically alarm; the power supply of the test system and the power supply of the motor 500 to be tested form a power supply system, which is integrated in the control system assembly, and can realize the functions of opening and closing, adjustment, and programming in the computer. It can also meet the needs of two-wire and four-wire small motor control methods; through the CAN / LIN bus control method, the corresponding control instructions are sent to the motor controller. The main parameters of the instructions are baud rate, ID, data frame, etc. After the motor controller obtains the specified instructions, the motor 500 to be tested can run the corresponding action; at the same time, the data measured by the microphone 210 and each sensor can be collected in the data acquisition system, wherein the torque sensor 430 and the brake 420 work together to send the read data to the data acquisition system, and the computer can read and save the data collected in the data acquisition system. In addition, PID control is added, and an applied torque value is given to the computer, so that the lower hysteresis reducer of the PLC controls the torque of the brake 420. The digital acquisition system reads the data of the torque sensor 430 and sends it to the PC. The PC compares the actual value and the target value, and the PLC increases or decreases the output until the target and actual values ​​are consistent.

[0089] The present invention can meet the needs of noise testing and structural load testing of commonly used small motors in vehicles (including window lift motors, sunroof motors, wiper motors, etc.) in a loaded working state, realizes synchronous testing of rigid constraint force and sound power, and isolates the noise of the test bench 114 from the noise of the motor 500 under test.

[0090] The preferred embodiments of the present invention are specifically described above, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A motor vibration and noise performance testing system, characterized in that: include: Test bench with a flat acoustic reflection surface on top; The bracket is a hemispherical bracket structure with an opening facing downward, the bracket is arranged on the acoustic reflection table, and a plurality of microphones facing the center of the bracket are evenly distributed on the hemispherical surface of the bracket; A motor fixture seat is arranged on the acoustic reflection table and located at the spherical center of the bracket, a plurality of force sensors are evenly distributed between the motor fixture seat and the acoustic reflection table, and the motor fixture seat is used to install the motor to be tested; The load torque device includes a base frame, a brake, a torque sensor and a transmission shaft. The base frame is located below the acoustic reflection table, the brake is installed on the base frame, the torque sensor is connected between the brake and the transmission shaft, and the upper end of the transmission shaft passes through the acoustic reflection table and is detachably coaxially connected to the output end of the motor under test.

2. The motor vibration and noise performance testing system according to claim 1, characterized in that: The upper end of the transmission shaft is provided with a spline shaft groove, and the spline shaft groove is slidably sleeved with a spline shaft body, and the upper end of the spline shaft body is connected to the motor to be measured.

3. The motor vibration and noise performance testing system according to claim 1, characterized in that: The bracket includes a bottom ring and multiple longitudinal rods. The longitudinal rods are in the shape of arc rods and are distributed in a radial umbrella shape. The upper ends of the multiple longitudinal rods are connected to each other, and the lower ends of the multiple longitudinal rods are connected to the bottom ring. Each longitudinal rod is provided with multiple microphones at adjustable intervals.

4. The motor vibration and noise performance testing system according to claim 3, characterized in that: The bottom ring includes a plurality of arc-shaped cross bars, two adjacent cross bars are connected with supporting feet, and the lower ends of the longitudinal bars are connected to the supporting feet; The bracket also includes a center plate, and the upper ends of the plurality of longitudinal rods are connected to the outer periphery of the center plate in an annular manner. A central slot hole penetrating vertically is provided at the center of the center plate, and the microphone is coaxially provided in the central slot hole.

5. The motor vibration and noise performance testing system according to claim 3, characterized in that: The longitudinal rod is provided with a plurality of slide seats, the slide seats are slidably arranged along the longitudinal rod, the slide seats are hinged with a mounting clip, and the microphone clip is mounted on the mounting clip.

6. The motor vibration and noise performance testing system according to any one of claims 1 to 5, characterized in that: The base frame is connected to a plurality of vertically arranged columns, the lower ends of the columns are fixedly connected to the base frame, and a detachable component is provided between the upper ends of the columns and the acoustic reflection table top, and the detachable component is used to maintain and disconnect the rigid connection between the upper ends of the columns and the acoustic reflection table top.

7. The motor vibration and noise performance testing system according to claim 6, characterized in that: The acoustic reflection table top is provided with a plurality of countersunk holes corresponding one by one to the plurality of columns. The detachable component comprises a sleeve and a cover. The sleeve is used to be detachably mounted on the countersunk holes and detachably connected to the upper ends of the columns. The cover is used to detachably seal and cover the countersunk holes to keep the acoustic reflection table top flat.

8. The motor vibration and noise performance testing system according to claim 7, characterized in that: The acoustic reflection table surface includes a motor mounting platen and a plurality of spliced ​​platens located around the motor mounting platen. The plurality of spliced ​​platens are spliced ​​together in a ring shape to form a step groove for mounting the motor mounting platen. The motor tooling seat and the plurality of countersunk holes are provided with the motor mounting platen. The motor mounting platen is provided with an axial hole for the transmission shaft to pass through.

9. The motor vibration and noise performance testing system according to claim 8, characterized in that: The bottom of each spliced ​​table plate is connected to a stand, and the bottoms of the stand and the bottom frame are provided with pulley assemblies.

10. A method for testing motor vibration and noise performance, characterized in that: The following steps are involved: Using the motor vibration and noise performance testing system as described in any one of claims 6 to 9; Maintaining the upper end of the column in rigid connection with the acoustic reflection tabletop through the detachable component; The motor to be tested is mounted on the acoustic reflection table and arranged at the spherical center of the bracket through the motor fixture seat; Coaxially connecting the upper end of the transmission shaft and the output end of the motor under test; Disconnecting the rigid connection between the upper end of the column and the acoustic reflection tabletop through the detachable component; Controlling the operation of the motor under test according to preset parameters, and outputting a preset load to the motor under test through a brake; The output torque and rotation speed of the motor under test are detected by a torque sensor, the noise generated by the operation of the motor under test is detected by multiple microphones, and the structural load of the motor under test is detected by multiple force sensors.

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