Multi-working-condition motor vibration characteristic testing device based on end cover process error

Abstract

The invention discloses a multi-working-condition motor vibration characteristic testing device based on an end cover process error, which relates to the technical field of motor vibration testing and comprises a basic flat plate, a stator, a rotor, a rotating shaft, a rotating speed measuring disc, an end cover, a sensor and a motor load. The rotating speed measuring discs are arranged at two ends of the stator at intervals; the sensor is arranged on the stator and the end cover; a motor load is mounted at one end of the rotating shaft through a coupling; the end covers are installed at the two ends of the stator and are spaced from the stator, the end covers are located between the stator and the rotating speed measuring disc, the horizontal radial adjusting piece, the vertical radial adjusting piece and the circumferential adjusting piece are arranged between the end covers and the basic flat plate, the end covers are separated from a stator shell, mechanical vibration interference is effectively eliminated, and the rotating speed of the stator is improved. The collected stator casing vibration signal mainly reflects electromagnetic excitation; the end cover position and angle multi-degree-of-freedom fine adjustment mechanism can simulate different processing and assembling error states in an experiment and quantitatively evaluate the influence of different end cover process cooperation on electromagnetic vibration characteristics.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of motor vibration testing, and in particular to a multi-working-condition motor vibration characteristic testing device based on end cover process error. BACKGROUND

[0002] With the increasing demand for motor performance in the fields of new energy vehicles, industrial automation, and high-speed spindles, the vibration and noise problems during motor operation have attracted increasing attention. Motor vibration mainly comes from two major factors: mechanical vibration and electromagnetic vibration. Mechanical vibration mainly includes vibration caused by rotor imbalance, bearing gap, and dynamic coupling. Electromagnetic vibration is caused by the electromagnetic force wave generated by the stator and rotor in the air gap acting on the rotor and the casing, causing periodic structural response. With the increase of motor power density and the wide application of pulse width modulation (PWM) driving technology, electromagnetic vibration has become a key factor affecting the stability, service life, and comfort of the motor.

[0003] In motor assembly, the end cover serves as a positioning support for the rotor bearing, and its machining precision directly determines the coaxiality of the rotor and the stator and the uniformity of the air gap. Due to the errors in casting, milling, and assembly processes, the end cover often has the following deviations: (1) Eccentricity error: the center of the end cover hole does not coincide with the rotor axis, causing radial runout of the rotor during operation; (2) Inclination error: the end cover flange surface has an angle deviation from the axis, resulting in uneven air gap distribution; (3) Positioning error: the installation position of the end cover on the casing is not standardized during assembly, causing changes in overall stiffness.

[0004] In the field of motor vibration research, academia and industry first conduct in-depth research on the mechanism of motor vibration, explore the influence of electromagnetic excitation characteristics and motor structural characteristics on motor vibration, and then conduct motor vibration testing.

[0005] However, the above methods still have limitations in isolating electromagnetic vibration and mechanical vibration, making it difficult to accurately evaluate the characteristics of electromagnetic vibration and mechanical vibration, especially without considering the superimposed effect of geometric errors in the end cover production and processing process on vibration. Although there are several motor vibration testing devices on the market for evaluating vibration characteristics, most of the testing platforms rigidly connect the end cover with the casing, and the casing vibration signal contains both mechanical imbalance components and electromagnetic excitation components, making it difficult to extract electromagnetic and mechanical vibration characteristics separately; existing devices are based on the premise of ideal coaxiality, lack of mechanism design to adjust the position and angle of the end cover, and cannot quantitatively simulate the influence of end cover machining and assembly errors on electromagnetic vibration. SUMMARY

[0006] The main purpose of the present application is to provide a kind of multi-working-condition motor vibration characteristic testing device based on end cover process error, to solve the problem that electromagnetic and mechanical vibration characteristics are difficult to be extracted separately in the existing motor vibration test and the influence of end cover processing and assembly error on electromagnetic vibration cannot be quantitatively simulated.

[0007] To achieve the above-mentioned purpose, the present application provides a kind of multi-working-condition motor vibration characteristic testing device based on end cover process error, comprising a base plate, a stator mounted on the base plate and a rotor rotating in the stator;The rotor is provided with a rotating shaft;Further comprising: rotational speed measuring disc, is arranged at the two ends of the stator along the axial direction of the rotating shaft and there is a gap between the stator; end cover, rotatingly installed at the two ends of the stator and there is a gap between the stator;The end cover is located between the stator and the rotational speed measuring disc;Horizontal radial adjusting member is arranged between the end cover and the base plate along the horizontal direction, vertical radial adjusting member is arranged along the vertical direction, and circumferential adjusting member is arranged along the central axis of the end cover; The horizontal radial adjusting member or the vertical radial adjusting member moves the end cover along the horizontal direction or the vertical direction under the action of external force, and then drives the rotor to move along the horizontal direction or the vertical direction to offset the axis of the rotor relative to the axis of the stator;The end cover rotates along the circumferential adjusting member under the action of external force, so that the axis of the rotor is deflected relative to the axis of the stator; sensor, respectively installed on the stator and the end cover; Motor load, installed at one end of the rotating shaft through a shaft coupling.

[0008] As a further improvement of the present application, the bottom end of the end cover is provided with a connecting base;The connecting base is provided with a connecting screw hole;The base plate is provided with a fixed screw hole corresponding to the connecting screw hole;The fixed screw hole is provided with a fixed stud;The inner diameter of the connecting screw hole is greater than the outer diameter of the fixed stud.

[0009] As a further improvement of the present application, the connecting base comprises a connecting bottom plate and a connecting top plate arranged in parallel and spaced apart;Connecting vertical plate is arranged between the connecting bottom plate and the connecting top plate;The connecting screw hole is located on the connecting bottom plate.

[0010] As a further improvement of the present application, the horizontal radial adjusting member comprises horizontal adjusting plates arranged on both sides of the base plate and a plurality of groups of horizontal adjusting screws arranged on the horizontal adjusting plates;The horizontal adjusting screws respectively abut against both ends of the end cover under the action of external force.

[0011] As a further improvement of the present application, the vertical radial adjusting member comprises a vertical gasket;The vertical gasket is located between the end cover and the base plate.

[0012] As a further improvement of the application, the circumferential adjusting member comprises a circumferential adjusting hole arranged on the connecting base, and a circumferential adjusting rod arranged in the circumferential adjusting hole.

[0013] As a further improvement of the application, the first and second special measuring point seats are arranged on the stator casing and the end cover respectively, and the sensors are arranged on the first and second special measuring point seats respectively.

[0014] As a further improvement of the application, a plurality of groups of counterweight holes are arranged on the rotating speed measuring disc in a circumferential direction, and the counterweight members are detachably connected in the counterweight holes.

[0015] The application discloses a testing method of a multi-working-condition motor vibration characteristic testing device based on end cover process error. Step one, the end covers on both sides of the stator are adjusted to move in the same direction and at equal distances along the horizontal radial direction or the vertical radial direction, so that the axes of the two groups of end covers are located on the same straight line, and then the axis of the rotor is parallel to the axis of the stator and has a spacing, thereby simulating a horizontal radial eccentric working condition caused by the end cover process deviation; Step two, the end covers on both sides of the stator are adjusted to move in the same direction and at unequal distances or at equal distances in different directions along the horizontal radial direction or the vertical radial direction, so that the connecting line of the two groups of end covers, that is, the axis of the rotor, is parallel to the axis of the stator in different planes, and then the axes of the two groups of end covers are not coincident with the axis of the stator, thereby simulating a conical eccentric working condition caused by the end cover process deviation; Step three, the end covers on both sides of the stator are adjusted to rotate around the central axes thereof along the circumferential direction, so that the end covers on both sides of the stator have different angular offsets, thereby simulating a rotor bending eccentric working condition caused by the end cover process deviation.

[0016] The application has the following beneficial effects: 1. The end cover and the stator casing are separated, and reasonable structural design is adopted, so that mechanical vibration interference is effectively eliminated, and the collected vibration signals of the stator casing mainly reflect the electromagnetic.

[0017] 2. A multi-freedom degree fine adjustment mechanism of the position and the angle of the end cover is innovatively designed, different processing and assembly error states can be simulated in the experiment, and the influence of different end cover process matching on the electromagnetic vibration characteristic can be quantitatively evaluated.

[0018] 3. The application can realize vibration testing of different positions in the electromagnetic-mechanical excitation separation, ensure the separation effect, and realize the functions of magnetic density testing, motor end cover process simulation, variable load testing, shaft coupling misalignment testing, different stiffness shaft coupling vibration testing, rotor transverse vibration and torsional vibration testing, stator current and voltage testing, winding temperature rise monitoring and the like.

[0019] 4. The device of the present application has simple structure, is easy to realize, is convenient for sensor installation, and has wide application range. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 Figure 1 is a schematic diagram of the overall structure of a motor vibration characteristic testing device based on end cover process error according to the present application; Figure 2 Figure 2 is a schematic diagram of end cover position adjustment of a motor vibration characteristic testing device based on end cover process error according to the present application; Figure 3 Figure 3 is a schematic diagram of end cover-circumferential adjustment member connection structure of a motor vibration characteristic testing device based on end cover process error according to the present application; Figure 4 Figure 4 is a schematic diagram of end cover axis and stator axis coincidence of a motor vibration characteristic testing device based on end cover process error according to the present application; Figure 5 Figure 5 is a schematic diagram of end cover causing rotor radial eccentricity of a motor vibration characteristic testing device based on end cover process error according to the present application; Figure 6 Figure 6 is a schematic diagram of end cover causing rotor angular eccentricity of a motor vibration characteristic testing device based on end cover process error according to the present application; Figure 7 Figure 7 is a schematic diagram of end cover causing rotor bending of a motor vibration characteristic testing device based on end cover process error according to the present application; BRIEF DESCRIPTION OF REFERENCE NUMERALS 1, base plate; 2, stator; 201, stator casing; 202, stator core; 203, stator base; 3, rotor; 4, rotating shaft; 5, rotating speed measuring disc; 6, end cover; 7, sensor; 8, motor load; 9, horizontal radial adjustment member; 901, horizontal adjustment plate; 902, horizontal adjustment screw; 9021, first horizontal adjustment screw; 9022, second horizontal adjustment screw; 9023, third horizontal adjustment screw; 9024, fourth horizontal adjustment screw; 903, horizontal adjustment screw hole; 10, vertical radial adjustment member; 11, circumferential adjustment member; 1101, circumferential adjustment hole; 1102, circumferential adjustment rod; 1103, circumferential support hole; 12, power connection end; 13, non-power connection end; 14, bearing; 15, connecting base; 1501, connecting bottom plate; 1502, connecting top plate; 1503, connecting vertical plate; 16, connecting screw hole; 17, fixing screw hole; 18, fixing stud; 19, first special measuring point seat; 20, second special measuring point seat; 21, counterweight hole; 22, counterweight member; 23, shaft coupling. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the described examples are only some of the examples of the present application, but not all the examples. The examples in the present application and the features in the examples can be combined with each other without conflict. Based on the examples in the present application, all the other examples obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0022] Referring to Figure 1 The present application is a multi-working-condition motor vibration characteristic testing device based on end cover process error, which comprises a base plate 1, a stator 2 installed on the base plate 1, and a rotor 3 rotating in the stator 2, wherein the rotor 3 is provided with a rotating shaft 4, and further comprises a rotating speed measuring disc 5, an end cover 6, a sensor 7, and a motor load 8.

[0023] The rotating speed measuring disc 5 is arranged at both ends of the stator 2 along the axial direction of the rotating shaft 4 and has a spacing with the stator 2; The sensor 7 is installed on the stator 2 and the end cover 6, respectively; The motor load 8 is installed at one end of the rotating shaft 4 through a coupling; The end cover 6 is rotatably installed at both ends of the stator 2 and has a spacing with the stator 2, the end cover 6 is located between the stator 2 and the rotating speed measuring disc 5, and horizontal radial adjusting members 9 are arranged between the end cover 6 and the base plate 1 along the horizontal direction, vertical radial adjusting members 10 are arranged along the vertical direction, and circumferential adjusting members 11 are arranged along the central axis of the end cover 6, the horizontal radial adjusting members 9 or the vertical radial adjusting members 10 drive the end cover 6 to move along the horizontal direction or the vertical direction under the action of external force, thereby driving the rotor 3 to move along the horizontal direction or the vertical direction to offset the axis of the rotor 3 relative to the axis of the stator 2; the end cover 6 rotates along the circumferential adjusting members 11 under the action of external force to deflect the axis of the rotor 3 relative to the axis of the stator 2.

[0024] In the present example, the stator 2 comprises a stator 2 housing and a stator 2 core with windings, the stator 2 housing is provided with a stator 2 base at the bottom, the stator 2 base is bolted on the base plate 1, the stator 2 core with windings is provided with a special test coil inside for sensing and quantifying the magnetic density change of the stator 2, a PT100 temperature measuring element is embedded in each phase of the stator 2 winding to realize accurate calibration of temperature change under different working conditions, at the same time, a Hall sensor 7 is integrated in the stator 2 for real-time acquisition of the angular displacement and rotating speed signal of the rotor 3; the cooling mode is natural cooling, which simplifies the auxiliary system and improves the repeatability and stability of the test.

[0025] In the embodiment, the stator 2 core is in interference fit with the stator 2 shell to ensure structural rigidity and installation accuracy. The stator 2 shell is integrally processed after being formed by welding a steel plate and a round steel to ensure good mechanical strength and thermal stability. The stator 2 shell is provided with a power connection end 12 and a non-power connection end 13 at the left and right ends respectively. The power connection end 12 is a motor winding connection port, and the non-power connection end 13 is a connection port for various sensors 7.

[0026] It should be noted that the two ends of the rotor 3 are mounted on the end cover 6, and the end cover 6 is provided with a hole and a bearing 14. The rotating shaft 4 of the rotor 3 is connected with the bearing 14, so that the rotor 3 is rotatably mounted on the end cover 6. The end cover 6 provides support for the entire rotor 3. By adjusting the position of the end cover 6 relative to the stator 2, the relative position of the axis of the rotor 3 and the axis of the stator 2 can be adjusted by moving the end cover 6. The end cover 6 not only bears the support function, but also serves as a carrier for adjusting the assembly deviation of the end cover 6. The ordinary end cover 6 is thickened to form a seat for the bearing 14, thereby ensuring high support rigidity and strength.

[0027] In the embodiment, the two ends of the rotor 3 are rotatably connected with the end cover 6 through the rotating shaft 4. The rotor 3 is located in the stator 2, and the electromagnetic field coupling effect is achieved through the predetermined spacing between the stator 2 and the rotor 3, thereby generating an electromagnetic torque to realize the rotation of the rotating shaft 4.

[0028] In the embodiment, the rotating speed measuring disc 5 is a toothed disc or a light code disc for speed measurement using a magneto-electric sensor 7, which can measure the torsional vibration response of the rotor 3 in real time.

[0029] In the embodiment, the size of the motor load 8 can be changed to perform variable load testing.

[0030] In the embodiment, the sensor 7 adopts an existing structure. The sensor 7 integrates a magnetic density testing unit, a rotating speed and angle detection unit, a temperature testing unit, and a vibration detection unit. The sensor 7 cooperates with a data acquisition system to realize synchronous recording and analysis, and supports separate extraction and modeling research of electromagnetic vibration characteristics and mechanical vibration characteristics.

[0031] In the embodiment, the end cover 6 is used to support the rotor 3. By adjusting the horizontal position and vertical height of the end cover 6 on the base plate 1, the axis of the rotating shaft 4 can be moved in the radial direction, so that the axis of the rotor 3 is offset relative to the axis of the stator 2. When both end covers 6 are normally installed, the axes of the two end covers 6 coincide with the axis of the stator 2. When the two groups of end covers 6 on both sides of the stator 2 are synchronously moved in the horizontal direction or the vertical direction, and the axes of the two groups of end covers 6 are located on the same straight line, the axis of the rotor 3 is parallel to the axis of the stator 2 with a spacing. At this time, the axes of the two end covers 6 coincide, but do not coincide with the axis of the stator 2, which can simulate the radial eccentric working condition caused by the process deviation of the end cover 6.

[0032] When the two sets of end covers 6 on both sides of the stator 2 move in different directions or different distances (move in opposite directions) in the horizontal direction or the vertical direction, the connecting line of the two sets of end covers 6, that is, the axis of the rotor 3, is out of the plane parallel to the axis of the stator 2, and the projection of the axis of the stator 2 and the axis of the rotor 3 on the horizontal plane intersects, at this time, the axes of the two end covers 6 do not coincide, and the axis of the stator 2 also does not coincide, at this time, the rotor 3 rotates and does a conical motion, that is, it can simulate the conical eccentric working condition caused by the process deviation of the end cover 6. When the two sets of end covers 6 on both sides of the stator 2 have different angular deviations, the rotor 3 can simulate the bending eccentric working condition caused by the process deviation of the end cover 6.

[0033] The stator 2, the rotor 3 and the two end covers 6 are uniformly installed on a high-rigidity base plate 1 that has been subjected to quenching and tempering treatment, which can effectively reduce the interference of mechanical vibration and electromagnetic vibration coupling on the test results. A gap is designed between the end cover 6 and the shell, and the end cover 6 is precisely positioned by the end cover 6 support module to simulate the influence of different assembly errors on the vibration characteristics.

[0034] By separating the end cover 6 from the shell and the bearing 14 seat from the shell, the mechanical vibration interference is effectively eliminated, the collected shell vibration signal mainly reflects the electromagnetic excitation, and a high-precision test means for electromagnetic vibration is introduced.

[0035] Based on the above embodiment, referring to Figure 1 、 2 , the bottom end of the end cover 6 is provided with a connecting base 15, the connecting base 15 is provided with a connecting screw hole 16, the base plate 1 is provided with a fixed screw hole 17 corresponding to the connecting screw hole 16, and the fixed screw hole 17 is provided with a fixed screw column 18. The inner diameter of the connecting screw hole 16 is greater than the outer diameter of the fixed screw column 18, so as to ensure the mobility of the connecting base 15 on the base plate 1.

[0036] Specifically, the connecting base 15 includes a connecting bottom plate 1501 and a connecting top plate 1502 which are spaced apart and arranged in parallel, and a connecting vertical plate 1503 is arranged between the connecting bottom plate 1501 and the connecting top plate 1502. The connecting screw hole 16 is located on the connecting bottom plate 1501, and the connecting screw hole 16 and the fixed screw hole 17 are arranged in four groups respectively. The fixed screw column 18 is connected with the fixed screw hole 17 through threads and located in the connecting screw hole 16. In the process of simulating the installation error of the end cover 6, when the end cover 6 moves in the horizontal radial direction or the vertical radial direction, the inner diameter of the connecting screw hole 16 is greater than the outer diameter of the fixed screw column 18 (the inner diameter of the connecting screw hole is 2mm larger than the inner diameter of the fixed screw hole 17), and there is a gap between the two, so that the end cover 6 can move horizontally on the base plate 1.

[0037] Based on the above embodiment, referring to Figure 1 、 2The horizontal radial adjusting member 9 includes horizontal adjusting plates 901 arranged on both sides of the base plate 1, and multiple groups of horizontal adjusting screws 902 arranged on the horizontal adjusting plates 901, which respectively abut against both ends of the end cover 6 under the action of external force. By adjusting the abutting lengths of the horizontal adjusting screws 902 on the horizontal adjusting plates 901 on both sides of the base plate 1 against the end cover 6, the end cover 6 can be pushed to move in the horizontal direction on the base plate 1, so as to adjust the axis offset of the end cover 6 relative to the axis of the stator 2.

[0038] Specifically, two groups of end covers 6 are arranged on the base plate 1 at intervals, and horizontal adjusting plates 901 are arranged on both sides of each group of end covers 6. Four groups of horizontal adjusting plates 901 are welded on the base plate 1 in total, and two groups of horizontal adjusting screw holes 903 are arranged side by side on each group of horizontal adjusting plates 901. The horizontal adjusting screw 902 is threadedly connected with the horizontal adjusting screw 902, and the position of the end cover 6 on the base plate 1 can be adjusted and fixed by rotating the horizontal adjusting screw 902 to abut against the connecting bottom plate 1501. For example, the first horizontal adjusting screw 9021, the second horizontal adjusting screw 9022, the third horizontal adjusting screw 9023, and the fourth horizontal adjusting screw 9024 are arranged on the horizontal adjusting plates 901 on both sides of the same end cover 6. The first horizontal adjusting screw 9021 and the second horizontal adjusting screw 9022 are installed on the same horizontal adjusting plate 901 as a group, and the third horizontal adjusting screw 9023 and the fourth horizontal adjusting screw 9024 are installed on the same horizontal adjusting plate 901 as a group. By rotating the first horizontal adjusting screw 9021 and the second horizontal adjusting screw 9022 to abut against one side of the connecting bottom plate 1501, and abutting the opposite side of the connecting bottom plate 1501 against the third horizontal adjusting screw 9023 and the fourth horizontal adjusting screw 9024, the position of the end cover 6 in the horizontal radial direction on the base plate 1 can be fixed. When the distances between the two groups of horizontal adjusting plates 901 and the end cover 6 of the same group of end covers 6 are consistent, the axis of the end cover 6 coincides with the axis of the stator 2 (at this time, the height of the end cover 6 in the vertical radial direction is also adjusted, and the center of the end cover 6 is located on the same straight line as the center of the stator 2 in the vertical direction). When the distances between the two groups of horizontal adjusting plates 901 and the end cover 6 of the same group of end covers 6 are inconsistent (for example, when the first horizontal adjusting screw 9021 pushes the end cover 6 to move towards the third horizontal adjusting screw 9023), the axis of the end cover 6 is offset from the axis of the stator 2 by a distance, and the axes of the two groups of end covers 6 coincide, so that the horizontal radial eccentric working condition caused by the process deviation of the end cover 6 can be simulated.

[0039] Based on the above embodiment, refer to Figure 1The vertical diameter adjustment component 10 includes vertical shims located between the end cover 6 and the base plate 1. By increasing or decreasing the number of vertical shims, the height of the end cover 6 can be adjusted to adjust the alignment of the axis of the end cover 6 with the axis of the stator 2, or to offset it upwards or downwards. This can simulate the vertical diameter eccentricity caused by the process deviation of the end cover 6.

[0040] Specifically, when adjusting the position of the end cap 6 in the vertical direction, vertical shims are placed between the connecting base plate 1501 and the foundation plate 1. When the end cap 6 moves upward, the number or thickness of the vertical shims is reduced, and the end cap 6 moves downward. The position of the end cap 6 is fixed using the horizontal adjusting screw 902 on the horizontal adjusting plate 901.

[0041] Based on the above embodiments, see Figure 1 , 3 The circumferential adjustment component 11 includes a circumferential adjustment hole 1101 provided on the connecting base 15 and a circumferential adjustment rod 1102 located in the circumferential adjustment hole 1101. The base plate 1 is provided with a circumferential support hole 1103 corresponding to the circumferential adjustment hole 1101. After the horizontal adjustment screws 902 on both sides of the base end cover 6 are limited, the end cover 6 can be pushed to rotate along the circumferential adjustment rod 1102, so that the end cover 6 rotates along its own central axis. When the two end covers 6 have different angular offsets, the bending and eccentric working condition of the rotor 3 caused by the process deviation of the end cover 6 can be simulated.

[0042] Specifically, the circumferential adjustment hole 1101 is located on the connecting base plate 1501. After the end cover 6 rotates along the circumferential adjustment rod 1102, the first horizontal adjustment screw 9021 and the third horizontal adjustment screw 9023 are loosened simultaneously, and the second horizontal adjustment screw 9022 and the fourth horizontal adjustment screw 9024 are tightened in coordination. Alternatively, the second horizontal adjustment screw 9022 and the fourth horizontal adjustment screw 9024 are loosened simultaneously, and the first horizontal adjustment screw 9021 and the third horizontal adjustment screw 9023 are tightened in coordination, thereby controlling the end cover 6 to rotate along its own central axis.

[0043] Based on the above embodiments, see Figure 1 To improve the stability and testing accuracy of sensor 7 installation, a first dedicated measuring point seat 19 and a second dedicated measuring point seat 20 are respectively set on the stator 2 housing and end cover 6. Sensor 7 is installed on the first dedicated measuring point seat 19 and the second dedicated measuring point seat 20 respectively. The first dedicated measuring point seat 19 is set on the stator 2 housing to avoid the sensor 7 being directly installed on the curved surface, which would cause testing errors. The second dedicated measuring point seat 20 is set on the upper surface of the end cover 6 to measure the vibration response at the end cover 6.

[0044] Specifically, the first special measuring point seat 19 and the second special measuring point seat 20 are respectively located on the upper end faces of the stator 2 shell and the end cover 6, the first special measuring point seat 19 is arranged in three groups at intervals, and the first special measuring point seat 19 is located between the power connection end 12 and the non-power connection end 13.

[0045] Based on the above embodiment, referring to Figure 1 , a plurality of balance holes 21 are arranged on the speed measuring disc 5 in the circumferential direction at intervals, and a balance weight 22 is detachably connected in the balance hole 21, and the speed measuring disc 5 is fixed by using a keyless expansion sleeve structure, so as to avoid introducing an additional residual unbalance amount due to key groove processing, and at the same time, the speed measuring disc 5 is allowed to move freely in the axial direction.

[0046] Specifically, the speed measuring disc 5 is provided with balance holes 21 in the circumferential direction, and the balance weight 22 is a bolt or a balance block, and the balance hole 21 is used for bolt and balance block installation, and the unbalance condition simulation is realized by changing the balance weight, so as to facilitate systematic analysis of the influence of different unbalance degrees on electromagnetic vibration.

[0047] In the present application, when the motor vibration characteristic test device under multi-working condition of the end cover 6 process error is tested, the following steps are included: Step one, adjust the end cover 6 on both sides of the stator 2 to move in the same direction and equidistantly in the horizontal radial direction or the vertical radial direction, so that the axes of the two end covers 6 are located on the same straight line, and then the axis of the rotor 3 is parallel to the axis of the stator 2 and there is a spacing, to simulate the horizontal radial eccentric working condition caused by the process deviation of the end cover 6; Step two, adjust the end cover 6 on both sides of the stator 2 to move in the same direction and unequidistantly or equidistantly and oppositely in the horizontal radial direction or the vertical radial direction, so that the connecting line of the two end covers 6, that is, the axis of the rotor 3, is parallel to the axis of the stator 2 in different planes, and then the axes of the two end covers 6 do not coincide and the axis of the stator 2 also does not coincide, to simulate the conical eccentric working condition caused by the process deviation of the end cover 6; Step three, rotate the end cover 6 on both sides of the stator 2 along the circumferential direction with the center axis of itself, so that the end cover 6 on both sides of the stator 2 has different angle offsets, to simulate the rotor 3 bending eccentric working condition caused by the process deviation of the end cover 6.

[0048] When both end covers 6 are normally installed, as shown in Figure 4 , the axes of the two end covers 6 coincide with the axis of the stator 2; when both end covers 6 have the same size radial translation, as shown in Figure 5 , the axes of the two end covers 6 coincide, but do not coincide with the axis of the stator 2, that is, the radial eccentric working condition caused by the process deviation of the end cover 6 can be simulated; when both end covers 6 have different direction or different size radial translation, as shown in Figure 6 , the axes of the two end covers 6 do not coincide, and the axis of the stator 2 also does not coincide, at this time the rotor 3 rotates in a conical motion, that is, the conical eccentric working condition caused by the process deviation of the end cover 6 can be simulated; when both end covers 6 have different angle offsets, as shown inFigure 7 As shown, the rotor 3 bending eccentricity condition caused by the process deviation of the end cover 6 can be simulated.

[0049] The load end of the rotating shaft 4 is connected with a torque sensor 7 with an elastic pin coupling 23, the coupling 23 is installed with a motor load 8, the variable load test, the coupling 23 misalignment test and the vibration test of different stiffness couplings 23 can be carried out by changing the alignment state of the coupling 23, the type of the coupling 23 and the size of the load.

[0050] In the above conditions, the electromagnetic vibration characteristics and the mechanical vibration characteristics can be analyzed by installing the sensor 7 on the measuring point seat, the motor rotor 3 torsional vibration characteristics can be analyzed by measuring the real-time rotating speed of the rotating speed measuring disc 5 on both sides, and the motor rotor 3 lateral vibration characteristics can be analyzed by measuring the displacement of the rotor 3 shaft at different positions.

[0051] The above only describes the preferred embodiments of the present application and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-condition motor vibration characteristic testing device based on end cap manufacturing error, comprising a base plate (1), a stator (2) mounted on the base plate (1), and a rotor (3) rotatably located within the stator (2); the rotor (3) is provided with a rotating shaft (4); characterized in that: Also include: The rotating speed measuring disc (5) is arranged at both ends of the rotating shaft (4) in the axial direction and has a gap with the stator (2); The end cover (6) is rotatably installed at both ends of the stator (2) and has a gap with the stator (2); the end cover (6) is located between the stator (2) and the rotating speed measuring disc (5); horizontal radial adjusting members (9) are arranged between the end cover (6) and the base plate (1) in the horizontal direction, vertical radial adjusting members (10) are arranged in the vertical direction, and circumferential adjusting members (11) are arranged in the central axis direction of the end cover (6); The horizontal radial adjusting member (9) or the vertical radial adjusting member (10) drives the end cover (6) to move in the horizontal direction or the vertical direction under the action of an external force, thereby driving the rotor (3) to move in the horizontal direction or the vertical direction to offset the axis of the rotor (3) relative to the axis of the stator (2); the end cover (6) rotates along the circumferential adjusting member (11) under the action of an external force, so that the axis of the rotor (3) is deflected relative to the axis of the stator (2); The sensor (7) is installed on the stator (2) and the end cover (6), respectively; The motor load (8) is installed at one end of the rotating shaft (4) through a shaft coupling.

2. The multi-working-condition motor vibration characteristic testing device based on end cap process error according to claim 1, characterized in that: The bottom end of the end cover (6) is provided with a connecting base (15); the connecting base (15) is provided with a connecting screw hole (16); the base plate (1) is provided with a fixed screw hole (17) corresponding to the connecting screw hole (16); the fixed screw hole (17) is provided with a fixed screw column (18); the inner diameter of the connecting screw hole (16) is greater than the outer diameter of the fixed screw column (18).

3. The multi-working-condition motor vibration characteristic testing device based on end cap process error according to claim 2, characterized in that: The connecting base (15) includes a connecting bottom plate (1501) and a connecting top plate (1502) arranged in parallel and spaced apart; a connecting vertical plate (1503) is arranged between the connecting bottom plate (1501) and the connecting top plate (1502); the connecting screw hole (16) is located on the connecting bottom plate (1501).

4. The multi-working-condition motor vibration characteristic testing device based on end cap process error according to claim 3, characterized in that: The horizontal radial adjusting member (9) includes horizontal adjusting plates (901) arranged on both sides of the base plate (1) and a plurality of groups of horizontal adjusting screw rods (902) arranged on the horizontal adjusting plates (901); the horizontal adjusting screw rods (902) respectively abut against both ends of the end cover (6) under the action of an external force.

5. The multi-operating condition motor vibration characteristic testing device based on end cap process error according to claim 4, characterized in that: The vertical radial adjusting member (10) includes a vertical gasket; the vertical gasket is located between the end cover (6) and the base plate (1).

6. The multi-operating condition motor vibration characteristic testing device based on end cap process error according to claim 5, characterized in that: The circumferential adjusting member (11) includes a circumferential adjusting hole (1101) arranged on the connecting base (15) and a circumferential adjusting rod (1102) located in the circumferential adjusting hole (1101); the base plate (1) is provided with a circumferential support hole (1103) corresponding to the circumferential adjusting hole (1101).

7. The multi-operating condition motor vibration characteristic testing device based on end cap process error according to claim 6, characterized in that: The stator (2) housing and the end cover (6) are respectively provided with a first special measuring point seat (19) and a second special measuring point seat (20); the sensor (7) is installed on the first special measuring point seat (19) and the second special measuring point seat (20), respectively.

8. The multi-operating condition motor vibration characteristic testing device based on end cap process error according to claim 7, characterized in that: A plurality of groups of counterweight holes (21) are arranged on the rotating speed measuring disc (5) in the circumferential direction; a counterweight member (22) is detachably connected in the counterweight hole (21).

9. A test method of a multi-working condition motor vibration characteristic test device based on end cover process error according to any one of claims 1-8, comprising the following steps: Step one, adjust the end cover (6) on both sides of the stator (2) to move in the same direction and equidistantly, so that the axis of the two groups of end covers (6) are on the same straight line, and then the axis of the rotor (3) is parallel to the axis of the stator (2) with a certain distance, simulating the horizontal radial eccentric working condition caused by the process deviation of the end cover (6); Step two, adjust the end cover (6) on both sides of the stator (2) to move in the same direction and unequidistantly or equidistantly and oppositely, so that the connecting line of the two groups of end covers (6) is also the axis of the rotor (3), which is parallel to the axis of the stator (2) but in different planes, and then the axis of the two groups of end covers (6) does not coincide with the axis of the stator (2), simulating the conical eccentric working condition caused by the process deviation of the end cover (6); Step three, adjust the end cover (6) on both sides of the stator (2) to rotate around its central axis, so that the end cover (6) on both sides of the stator (2) has different angular offsets, simulating the bending eccentric working condition of the rotor (3) caused by the process deviation of the end cover (6).

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