High-speed permanent magnet servo motor balance mud separation nondestructive detection equipment and detection method

Abstract

The invention belongs to the technical field of motor detection, and particularly discloses a high-speed permanent magnet servo motor balance mud separation nondestructive testing device and method, the high-speed permanent magnet servo motor balance mud separation nondestructive testing device comprises a base, the base is of a long-plate-shaped structure, the upper surface of the base is provided with a first shell and a second shell, and the first shell and the second shell are both made of sound absorption materials. According to the high-speed permanent magnet servo motor balance mud separation nondestructive testing equipment and the testing method, motor noise waveforms meeting the technical requirements of dynamic balance are collected as standard waveforms, the dynamic balance state of a rotor is manually intervened to form unqualified waveforms, and the qualified waveforms and the unqualified waveforms jointly form a judgment database; the vibration oscillogram of the to-be-tested motor is compared with the judgment database to judge the qualified state and the deviation range of the dynamic balance of the motor rotor, so that the balance mud falling state of the sealed motor rotor does not need to be observed through trepanning, and the test result is accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of motor detection, in particular to a non-destructive detection device and method for the detachment of balance mud of a high-speed permanent magnet servo motor. Background Technique

[0002] When the rotor of a permanent magnet servo motor rotates, if the mass distribution is uneven, an unbalanced force will be generated, resulting in vibration and noise. At present, the most widely used method in the motor manufacturing industry is to use the balance mud weight gain method for the dynamic balance of the rotor of the permanent magnet servo motor. Compared with the cutting weight reduction method, it has many advantages such as less equipment investment and simple process. If the balance mud falls off, the mass distribution of the rotor will be unbalanced again, making the motor speed unstable. In order to ensure the balance effect of the motor rotor, it is necessary to detect the detachment of the balance mud.

[0003] In a small fully enclosed structure motor where it is impossible to open an observation hole or window, it is impossible to inspect and determine whether the balance mud has fallen off by conventional methods such as visual inspection after assembly. In addition to metals such as aluminum, iron, and copper inside the motor, there are also various insulating materials. The image accuracy after scanning the formed composite structure with the existing industrial CT cannot meet the basic conditions for determination. Therefore, conventional detection methods cannot detect the detachment of the balance mud of the sealed permanent magnet servo motor rotor. Summary of the Invention

[0004] The purpose of the present invention is to provide a non-destructive detection device and method for the detachment of balance mud of a high-speed permanent magnet servo motor, so as to solve the problem that the detachment of the balance mud of the rotor of a closed permanent magnet servo motor cannot be detected by conventional methods as mentioned in the above background technique.

[0005] To achieve the above object, the present invention provides the following technical solutions: a non-destructive detection device and method for the separation of balance mud of a high-speed permanent magnet servo motor, including a base. The base is in the shape of a long plate. On the upper surface of the base, there is a first housing and a second housing. Both the first housing and the second housing are made of sound-absorbing materials. The first housing is fixedly installed on the upper surface of the base through a bracket. The second housing is slidably connected to the upper surface of the base through a bracket. The first housing is a hollow box structure with one side open. The second housing is a hollow box structure with one side open. The open sides of the first housing and the second housing are arranged opposite to each other. The inner wall of the second housing is slidably engaged with the outer surface of the first housing, and the second housing completely wraps the open end of the first housing. The base, the first housing, and the second housing form a housing structure. Inside the housing structure, there is an audio collector. The audio collector is fixedly installed on the inner wall of the first housing. The audio collector is connected to a computer through a wireless network. A connecting pipe is penetrated through the bottom surface of the first housing. A valve is arranged inside the connecting pipe to control the opening and closing. An elastic isolation plate is fixedly installed on the bottom surface inside the first housing. A power wire is penetrated through the surface of the second housing;

[0006] Preferably, a slot structure is arranged on the surface of the first housing, and the slot structure can realize the quick connection and fixation between the first housing and the second housing.

[0007] With the above technical solution, the use of the slot structure can facilitate the connection between the first housing and the second housing.

[0008] Preferably, the connecting structure includes a positioning rod. The cross-section of the positioning rod is in a T-shaped structure. The positioning rod is slidably connected to the side surface of the second housing. The positioning rod is in snap-fit with a circular slot arranged on the upper surface of the first housing. A groove is arranged on the open side surface of the first housing. The groove is in a square structure. A first magnetic block is fixedly arranged on the inner wall of the groove. The first magnetic block is a square structure formed by splicing long strip magnets.

[0009] With the above technical solution, the use of the snap-fit between the positioning rod and the slot on the surface of the first housing can assist in determining the connection position of the second housing.

[0010] Preferably, a snap-fit structure is arranged inside the second housing. The snap-fit structure cooperates with the slot structure to form a sealed space inside the first housing and the second housing.

[0011] With the above technical solution, the use of the snap-fit structure can connect the first housing and the second housing to form a sealed test space.

[0012] Preferably, the engaging structure includes a connecting cylinder, which is in an L-shaped structure. The connecting cylinder penetrates through the surface of the second housing. The inside of the connecting cylinder is hollow, and a through hole smaller than the inner diameter is provided at one end of the connecting cylinder. One end of the through hole of the connecting cylinder is located outside the second housing. A clamping block is fixedly installed at the other end of the second housing. L-shaped protrusions are respectively arranged on both side surfaces of the clamping block. The connecting cylinder and the clamping block form an engaging unit. A plurality of engaging units are rectangularly distributed on the surface of the second housing. The clamping blocks of the plurality of engaging units are connected to the side surface of the same second magnet. The second magnet is a square structure formed by splicing a plurality of rectangular magnets. The second magnet is the same size as the first magnet, and the magnetic poles between the second magnet and the first magnet attract each other.

[0013] With the above technical solution, the adsorption between the second magnet and the first magnet can be used to initially fix the first housing and the second housing.

[0014] Preferably, a sealing structure is provided on the surface of the connecting cylinder. The sealing structure uses the pressure difference inside and outside the device to seal the connection between the first housing and the second housing.

[0015] With the above technical solution, the sealing structure can be used to increase the sealing performance of the connection between the first housing and the second housing.

[0016] Preferably, the sealing structure includes an airbag, which is in an annular structure and is sleeved on the rectangular outer surface formed by a plurality of connecting cylinders. The airbag is an expandable pleated structure. The surface of the airbag is adhesively connected to the outer surface of the connecting cylinder, and a one-way pipeline is provided on the surface of the airbag and is in through connection with the inside of the connecting cylinder. The pipeline direction at the airbag is from the connecting cylinder to the airbag. A piston is slidably arranged inside the connecting cylinder. A through hole is provided on the surface of the connecting cylinder and is in through connection with the inside of the second housing. The through hole on the surface of the connecting cylinder and the through hole at the end of the connecting cylinder are respectively located on both sides of the piston.

[0017] With the above technical solution, the movement of the piston can be realized by using the pressure difference inside and outside the device, thereby driving the airbag to expand and bulge to increase the sealing performance of the device.

[0018] Preferably, it includes the following steps:

[0019] Step 1: Acquisition of vibration sound waves of the motor to be tested. Place the motor to be tested on the surface of the elastic isolation plate inside the first housing. After connecting the motor to be tested with the power supply, close the first housing and the second housing. Use a vacuum pump to evacuate the inside of the first housing and the second housing through the connecting pipeline. With the first housing and the second housing with sound-absorbing materials, an ideal test space for sound absorption and vacuum is formed. Start the motor and turn on the audio collector to collect the vibration noise sound waves of the motor to be tested.

[0020] Step 2: Acquisition of the standard vibration waveform of the balance motor. For the complete motor whose balance quantity has been confirmed to meet the technical requirements, sample the vibration frequency inside the first housing and the second housing. After the sampling of the motor used to generate the standard vibration waveform is completed, disassemble the motor, and use the direct visual inspection method to detect the detachment of the balance mud. When the balance mud has not detached, confirm that this waveform is the standard waveform, record the total weight of the balance mud used for the motor, sample the vibration frequency five times for each motor structure, and fit the five sampling frequencies according to the maximum inclusion principle to form a standard sound wave. The sound wave acquisition period takes one rotation of the motor as a period, and the period control is formed by processing the encoder signal of the servo motor;

[0021] Step 3: Generation of the judgment database. Use the disassembled motor rotor in Step 2, cooperate with the accurately weighed balance mud, and simulate the unbalance amount by increasing or decreasing 2% each time based on the total weight of the balance mud measured in Step 2. A total of 10 increasing or decreasing processes are carried out. Assemble the rotor and stator into a complete machine, and collect the sound waves inside the first housing and the second housing according to the records in Step 2. Take 5 vibration frequency readings and calculate the average value for each 2% test. The position of the balance bond extends from the center of the rotor to both sides. The data obtained from this item serves as the judgment database;

[0022] Step 4: Judgment of the waveform of the motor to be tested. Use a motor with the same structure as the motor to be tested in Step 1 to collect the sound wave, and compare the collected sound wave waveform with the waveforms in Step 1 and Step 2 to determine whether the dynamic balance of the rotor is qualified and the deviation range in the case of unqualified.

[0023] Adopting the above technical solution, the above steps can be used to detect the detachment of the balance mud of the enclosed servo motor.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: The non-destructive detection equipment and detection method for the detachment of the balance mud of the high-speed permanent magnet servo motor:

[0025] 1. In the present invention, the noise waveform of the motor that meets the dynamic balance technical requirements is collected as the standard waveform, and the dynamic balance state of the rotor is artificially intervened to form an unqualified waveform. The judgment database is jointly composed of the qualified waveform and the unqualified waveform. By using the vibration waveform diagram of the motor to be tested and comparing it with the judgment database, the qualified state and the deviation range of the dynamic balance of the motor rotor are judged, so that the detachment state of the balance mud of the sealed motor rotor does not need to be observed by opening holes, and the test result is accurate;

[0026] 2. In the present invention, a first housing and a second housing are provided with a snap connection to form a test space. The second housing can slide and separate from the first housing, facilitating the installation of the motor to be tested into the interior of the test space. A piston is provided inside a connecting cylinder arranged on the surface of the second housing. During the vacuum pumping step in the testing process, the movement of the piston can be realized by using the internal and external pressure difference of the device, causing the airbag on the outer surface of the connecting cylinder to expand and bulge, thereby sealing the connection between the first housing and the second housing and enhancing the sealing performance at the connection between the first housing and the second housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a front view structural schematic diagram of the present invention;

[0028] Figure 2 is a front sectional structural schematic diagram of the present invention;

[0029] Figure 3 is a structural schematic diagram of the first housing of the present invention;

[0030] Figure 4 is a front sectional structural schematic diagram of the first housing of the present invention;

[0031] Figure 5 is a structural schematic diagram of the second housing of the present invention;

[0032] Figure 6 is a front sectional structural schematic diagram of the second housing of the present invention;

[0033] Figure 7 is a structural schematic diagram of the connecting cylinder of the present invention;

[0034] Figure 8 is a front sectional structural schematic diagram of the connecting cylinder of the present invention;

[0035] Figure 9 is a structural schematic diagram of the separated first housing and second housing of the present invention;

[0036] Figure 10 is a sectional structural schematic diagram of the connection between the first housing and the second housing of the present invention.

[0037] In the figure: 1, base; 2, first housing; 3, second housing; 4, audio collector; 5, connecting pipe; 6, elastic isolation plate; 7, positioning rod; 8, groove; 9, first magnet; 10, connecting cylinder; 11, clamping block; 12, second magnet; 13, airbag; 14, piston. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] Please refer to Figures 1-10 , the present invention provides a technical solution: a non-destructive detection device and detection method for the separation of balance mud of a high-speed permanent magnet servo motor, including a base 1, a first housing 2, a second housing 3, an audio collector 4, a connecting pipe 5, an elastic isolation plate 6, a positioning rod 7, a groove 8, a first magnet 9, a connecting cylinder 10, a clamping block 11, a second magnet 12, an airbag 13, and a piston 14.

[0040] The base 1 is a long plate-shaped structure. The upper surface of the base 1 is provided with a first housing 2 and a second housing 3. Both the first housing 2 and the second housing 3 are made of sound-absorbing materials. The first housing 2 is fixedly installed on the upper surface of the base 1 through a bracket, and the second housing 3 is slidably connected to the upper surface of the base 1 through a bracket. The first housing 2 is a hollow box structure with one side open, and the second housing 3 is a hollow box structure with one side open. The open sides of the first housing 2 and the second housing 3 are arranged opposite to each other. The inner wall of the second housing 3 is slidably clamped on the outer surface of the first housing 2, and the second housing 3 completely wraps the open end of the first housing 2. The base 1, the first housing 2, and the second housing 3 form a housing structure. An audio collector 4 is arranged inside the housing structure. The audio collector 4 is fixedly installed on the inner wall of the first housing 2. The audio collector 4 is connected to a computer through a wireless network. A connecting pipe 5 is penetrated through the bottom surface of the first housing 2. A valve is arranged inside the connecting pipe 5 to control the opening and closing. An elastic isolation plate 6 is fixedly installed on the bottom surface inside the first housing 2. A power supply wire penetrates through the surface of the second housing 3;

[0041] As Figure 1 , Figure 2 and Figure 9 shown, when using this device to collect the vibration sound waves of the motor to be tested, slide open the first housing 2 and the second housing 3, place the motor on the upper surface of the elastic isolation plate 6 inside the first housing 2, and use the elastic isolation plate 6 to separate the motor from the bottom of the first housing 2 to avoid the resonance phenomenon generated during the startup of the motor from affecting the test results. Connect the motor to the power supply wire on the surface of the second housing 3, close the first housing 2 and the second housing 3, so that the first housing 2 and the second housing 3 form a closed test space, start the motor, and at the same time turn on the audio collector 4, use the audio collector 4 to collect the vibration sound waves of the motor, and transmit them to the computer for analysis.

[0042] The surface of the first housing 2 is provided with a slot structure, which can realize the quick connection and fixation between the first housing 2 and the second housing 3. The connection structure includes a positioning rod 7. The cross-section of the positioning rod 7 is a T-shaped structure. The positioning rod 7 is slidably connected to the side surface of the second housing 3 and is engaged with the circular slot provided on the upper surface of the first housing 2. A groove 8 is provided on the open side surface of the first housing 2. The groove 8 is in a square structure. A first magnetic block 9 is fixedly provided on the inner wall of the groove 8. The first magnetic block 9 is a square structure formed by splicing strip-shaped magnets. A clamping structure is provided inside the second housing 3. The clamping structure cooperates with the slot structure to form a sealed space inside the first housing 2 and the second housing 3. The clamping structure includes a connecting cylinder 10. The connecting cylinder 10 is in an L-shaped structure. The connecting cylinder 10 penetrates through the surface of the second housing 3. The inside of the connecting cylinder 10 is hollow, and a through hole smaller than the inner diameter is provided at one end of the connecting cylinder 10. One end of the through hole of the connecting cylinder 10 is located outside the second housing 3. A clamping block 11 is fixedly installed at the other end of the second housing 3. L-shaped protrusions are respectively provided on both side surfaces of the clamping block 11. The connecting cylinder 10 and the clamping block 11 form a clamping unit. A plurality of clamping units are rectangularly distributed on the surface of the second housing 3. The clamping blocks 11 of the plurality of clamping units are connected to the side surface of the same second magnetic block 12. The second magnetic block 12 is a square structure formed by splicing a plurality of rectangular magnets. The second magnetic block 12 is the same size as the first magnetic block 9, and the magnetic poles between the second magnetic block 12 and the first magnetic block 9 attract each other;

[0043] As Figure 3 , Figure 4 , Figure 5 and Figure 6 shown, during the process of opening the first housing 2 and the second housing 3, the positioning rod 7 is pulled out upward from the circular slot provided on the upper surface of the first housing 2, so that the first housing 2 and the second housing 3 are separated. The second housing 3 is pulled to one side, and the second housing 3 slides to one side on the upper surface of the base 1, so that the open sides of the first housing 2 and the second housing 3 are both exposed. At this time, the opening of the first housing 2 and the second housing 3 can be completed. During the closing process, the second housing 3 is pushed in the opposite direction, so that the second housing 3 wraps the open end of the first housing 2. The positioning rod 7 is inserted downward into the circular slot of the first housing 2. At the same time, the connecting cylinder 10 inside the second housing 3 moves synchronously. The connecting cylinder 10 drives the clamping block 11 and the second magnetic block 12 to move synchronously. The moving second magnetic block 12 approaches the first magnetic block 9 inside the second magnetic block 12. The first magnetic block 9 and the second magnetic block 12 attract each other, completing the preliminary fixing process of the first housing 2 and the second housing 3.

[0044] A sealing structure is provided on the surface of the connecting cylinder 10. The sealing structure utilizes the pressure difference inside and outside the device to seal the connection between the first housing 2 and the second housing 3. The sealing structure includes an airbag 13. The airbag 13 is of an annular structure and is sleeved on the outer surface of the rectangle formed by a plurality of connecting cylinders 10. The airbag 13 is an expandable pleated structure. The surface of the airbag 13 is adhesively connected to the outer surface of the connecting cylinder 10, and a one-way pipe is provided on the surface of the airbag 13 to communicate with the inside of the connecting cylinder 10. The direction of the pipe at the airbag 13 is from the connecting cylinder 10 to the airbag 13. A piston 14 is slidably arranged inside the connecting cylinder 10. A through hole is provided on the surface of the connecting cylinder 10 to communicate with the inside of the second housing 3. The through hole on the surface of the connecting cylinder 10 and the through hole at the end of the connecting cylinder 10 are respectively located on both sides of the piston 14;

[0045] As Figure 7 , Figure 8 , Figure 9 and Figure 10 shown, when the first housing 2 and the second housing 3 are initially fixed, the inside of the device is evacuated by using a vacuum pump through the connecting pipe 5. At this time, the pressure inside the device is less than the external atmospheric pressure. Under the action of the atmospheric pressure, the first housing 2 and the second housing 3 are closely attached to each other, realizing the reinforcement of the connection process between the first housing 2 and the second housing 3. At the same time, the through hole on the surface of the connecting cylinder 10 communicates with the inside of the device. Under the push of the external atmospheric pressure, the piston 14 inside the connecting cylinder 10 slides in the direction close to the clamping block 11. After passing over the through hole on the surface of the connecting cylinder 10, the remaining air inside the connecting cylinder 10 is squeezed into the inside of the airbag 13, causing the airbag 13 to expand and bulge, blocking the connection between the first housing 2 and the second housing 3 and increasing the sealing performance at the connection between the first housing 2 and the second housing 3.

[0046] Working principle: During the process of detecting the shedding of the motor balance mud, first open the first housing 2 and the second housing 3, put the motor to be tested inside, close the first housing 2 and the second housing 3, and use a vacuum pump to evacuate the inside of the first housing 2 and the second housing 3 through the connecting pipe 5. The first housing 2 and the second housing 3 with sound-absorbing materials form an ideal state test space for sound absorption and vacuum. Start the motor, use the audio collector 4 to collect the vibration noise sound waves of the motor to be tested, sample the vibration frequency of the whole motor that meets the balance quantity requirement to obtain a standard waveform, and through artificial intervention, obtain an unqualified waveform of the motor that does not reach the balance quantity. Integrate the standard waveform and the unqualified waveform to generate a judgment database, and compare it with the waveform of the motor to be tested to determine whether the rotor dynamic balance is qualified and the deviation range in the case of unqualified.

[0047] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A high-speed permanent magnet servo motor balance mud separation non-destructive testing device, comprising a base (1), wherein the base (1) is a long plate-shaped structure, and a first shell (2) and a second shell (3) are arranged on the upper surface of the base (1), wherein the first shell (2) and the second shell (3) are both made of sound-absorbing material, the first shell (2) is fixedly mounted on the upper surface of the base (1) by a bracket, and the second shell (3) is slidably connected to the upper surface of the base (1) by a bracket, the first shell (2) is a hollow box structure with one side open, and the second shell (3) is a hollow box structure with one side open, the open sides of the first shell (2) and the second shell (3) are arranged opposite to each other, the inner wall of the second shell (3) is slidably engaged with the outer surface of the first shell (2), and the second shell (3) completely wraps the open end of the first shell (2), and the base (1), the first shell (2) and the second shell (3) constitute a shell structure, characterized in that: An audio collector (4) is arranged inside the shell structure, and the audio collector (4) is fixedly mounted on the inner wall of the first shell (2). The audio collector (4) is connected to a computer via a wireless network. A connecting pipe (5) is arranged through the bottom surface of the first shell (2), and a valve is arranged inside the connecting pipe (5) to control opening and closing. An elastic isolation plate (6) is fixedly mounted on the bottom surface of the first shell (2), and a power supply wire is arranged through the surface of the second shell (3).

2. The high-speed permanent magnet servo motor balancing mud separation nondestructive testing equipment according to claim 1 is characterized in that: A slot structure is provided on the surface of the first housing (2), and the slot structure can realize the rapid connection and fixation between the first housing (2) and the second housing (3).

3. The high-speed permanent magnet servo motor balancing mud separation non-destructive testing equipment according to claim 2 is characterized in that: The connection structure comprises a positioning rod (7), the cross section of which is a T-shaped structure. The positioning rod (7) is slidably connected to the side surface of the second shell (3), and the positioning rod (7) is engaged and matched with a circular groove arranged on the upper surface of the first shell (2). The open side surface of the first shell (2) is provided with a groove (8), and the groove (8) is a "mouth" structure. The inner wall of the groove (8) is fixedly provided with a first magnetic block (9), and the first magnetic block (9) is a "mouth" structure formed by splicing long strip magnets.

4. The high-speed permanent magnet servo motor balancing mud separation nondestructive testing equipment according to claim 1 is characterized in that: The second housing (3) is provided with a snap-fit ​​structure inside, and the snap-fit ​​structure cooperates with the slot structure to form a closed space inside the first housing (2) and the second housing (3).

5. The high-speed permanent magnet servo motor balancing mud separation nondestructive testing equipment according to claim 4 is characterized in that: The clamping structure comprises a connecting tube (10), the connecting tube (10) is an L-shaped structure, the connecting tube (10) is arranged through the surface of the second housing (3), the interior of the connecting tube (10) is hollow, and one end of the connecting tube (10) is provided with a through hole smaller than the inner diameter, one end of the through hole of the connecting tube (10) is located outside the second housing (3), and the other end of the second housing (3) is fixedly mounted with a clamping block (11), and the two side surfaces of the clamping block (11) are respectively provided with The connecting tube (10) and the clamping block (11) form a clamping unit. The surface of the second housing (3) is rectangularly distributed with a plurality of clamping units. The clamping blocks (11) of the plurality of clamping units are connected to the side surface of the same second magnetic block (12). The second magnetic block (12) is a square structure formed by splicing a plurality of rectangular magnets. The second magnetic block (12) is the same size as the first magnetic block (9), and the magnetic poles of the second magnetic block (12) and the first magnetic block (9) attract each other.

6. The high-speed permanent magnet servo motor balancing mud separation nondestructive testing equipment according to claim 5 is characterized in that: A sealing structure is provided on the surface of the connecting tube (10), and the sealing structure uses the pressure difference between the inside and outside of the device to achieve sealing of the connection between the first shell (2) and the second shell (3).

7. The high-speed permanent magnet servo motor balancing mud separation nondestructive testing equipment according to claim 6 is characterized in that: The sealing structure comprises an airbag (13), the airbag (13) is an annular structure, and the airbag (13) is sleeved on a rectangular outer surface formed by a plurality of connecting tubes (10), the airbag (13) is an expandable pleated structure, the surface of the airbag (13) is bonded and connected to the outer surface of the connecting tube (10), and a one-way pipe is arranged on the surface of the airbag (13) and is connected to the inside of the connecting tube (10), the direction of the pipe at the airbag (13) is from the connecting tube (10) to the airbag (13), a piston (14) is slidably arranged inside the connecting tube (10), a through hole is arranged on the surface of the connecting tube (10) and is connected to the inside of the second shell (3), and the through hole on the surface of the connecting tube (10) and the through hole at the end of the connecting tube (10) are respectively located on both sides of the piston (14).

8. A nondestructive testing method for high-speed permanent magnet servo motor balance mud separation, applied in the testing device of any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: collecting vibration sound waves of the motor to be tested, placing the motor to be tested on the surface of the elastic isolation plate (6) inside the first housing (2), connecting the motor to be tested to a power source, closing the first housing (2) and the second housing (3), using a vacuum pump to evacuate the inside of the first housing (2) and the second housing (3) through the connecting pipe (5), and forming a sound-absorbing, vacuum idealized test space with the first housing (2) and the second housing (3) made of sound-absorbing materials, starting the motor, turning on the audio collector (4), and collecting vibration noise sound waves of the motor to be tested; Step 2: collecting the standard vibration waveform of the balancing motor, sampling the vibration frequency of the whole motor that has been confirmed to meet the technical requirements in the first housing (2) and the second housing (3), and disassembling the motor used to generate the standard vibration waveform after sampling, and detecting the balancing mud from falling off by direct visual inspection. If the balancing mud has not fallen off, confirm that the waveform is a standard waveform, and record the total weight of the balancing mud used in the motor. Sample the vibration frequency five times for each motor structure, and fit the five sampling frequencies according to the maximum inclusion principle to form a standard sound wave. The sound wave collection period is one cycle of the motor rotation, and the period control is formed by encoder signal processing of the servo motor; Step 3: Generate an evaluation database. Use the motor rotor disassembled in step 2 and accurately weighed balancing mud. Simulate the unbalance amount by increasing or decreasing the total weight of the balancing mud measured in step 2 by 2% each time. Perform the increasing or decreasing process 10 times in total. Assemble the rotor and stator into a complete machine. Collect sound waves in the No. 1 housing (2) and the No. 2 housing (3) as described in step 2. Take 5 vibration frequency readings for each 2% test and calculate the average value. The position of the balanced bonding is based on the center of the rotor and extends to both sides. The data obtained in this item is used as the evaluation database. Step 4: Determine the waveform of the motor to be tested. Use a motor with the same structure as the motor to be tested in step 1 to collect sound waves. Compare the collected sound wave waveforms with the waveforms in steps 1 and 2 to determine whether the rotor dynamic balance is qualified and the deviation range if it is unqualified.

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