Motor axial force eccentricity testing device

Abstract

The utility model relates to the technical field of motor testing, in particular to a motor axial force eccentricity testing device, which comprises a base, a stator assembly, an end cover, a bushing, a rotor assembly, a rotating shaft and an axial force eccentricity sensing assembly, the base is provided with a cavity, the rotor assembly is arranged in the cavity, the end cover is provided with a placement cavity, and the placement cavity is opposite to the cavity. The axial force eccentric induction assembly is arranged on the containing cavity, a through hole is formed in the containing cavity, the lining is arranged on the through hole and connected with the axial force eccentric induction assembly, the rotor assembly is arranged in the stator assembly, one end of the rotating shaft is connected with the rotor assembly, the other end of the rotating shaft penetrates through the lining, the lining is provided with a bearing, and the rotating shaft is rotationally arranged on the bearing. According to the utility model, the rotating shaft rotates at a high speed to provide axial eccentric force for the axial force eccentric sensing assembly, so that the force test of axial eccentricity is realized. The eccentric force under different rotating speed conditions is sensed through the gravity sensor, and the testing precision is high.

Description

Technical Field

[0001] The utility model relates to the technical field of motor testing, in particular to a device for testing the axial force eccentricity of a motor. Background Art

[0002] With the development of motor technology, higher requirements are imposed on the output capacity of motors. Motors are required to have higher torque output capacity at low speeds, with small torque ripple and high control precision. The direct drive motor introduces a modulation pole structure on the stator teeth of the traditional permanent magnet motor, and uses a special vernier effect to modulate the magnetic field of the stator armature winding with a low pole pair number and high speed, so as to obtain a harmonic magnetic field component that can match and act with the magnetic field of the permanent magnet with a high pole pair number and low speed.

[0003] During the production process of motors, it is necessary to test the motors, and the testing of motors includes the eccentricity test of the axial force. The existing eccentricity test of the axial force is difficult, and it is very difficult to master the accuracy. Therefore, new improvements need to be made to the existing motor testing. Summary of the Utility Model

[0004] To solve the above problems, during the testing process of the utility model, the rotating shaft rotates at a high speed to provide an axial eccentric force for the axial force eccentricity induction component, so as to realize the test of the axial eccentric force. A device for testing the axial force eccentricity of a motor with the dual functions of high test accuracy is realized by using a gravity sensor to sense the eccentric force under different rotational speeds.

[0005] The technical solution adopted by the utility model is: a device for testing the axial force eccentricity of a motor, including a base, a stator assembly, an end cover, a bushing, a rotor assembly, a rotating shaft, and an axial force eccentricity induction component. The base is provided with a cavity, the rotor assembly is arranged in the cavity, the end cover is provided with an installation cavity, the installation cavity is opposite to the cavity, the axial force eccentricity induction component is arranged on the installation cavity, the installation cavity is provided with a through hole, the bushing is arranged on the through hole and connected with the axial force eccentricity induction component, the rotor assembly is arranged in the stator assembly, one end of the rotating shaft is connected with the rotor assembly, and the other end passes through the bushing. The bushing is provided with a bearing, and the rotating shaft is rotatably arranged on the bearing; when the rotating shaft rotates, it transmits an axial eccentric force to the bushing, so as to provide an axial eccentric force for the axial force eccentricity induction component.

[0006] For further improvement of the above solution, the inner circumference of the stator assembly is provided with a rotor cavity, and the rotor assembly is arranged in the rotor cavity; the rotor assembly includes a rotor bracket and rotor magnetic tiles arranged on the rotor bracket, and the rotor magnetic tiles are opposite to the inner wall of the rotor cavity.

[0007] A further improvement to the above solution is that a sunk groove is provided at one end of the base facing the end cover. One end of the sunk groove communicates with the cavity. The end cover is provided with a convex ring, and the convex ring is used to fit on the wall surface of the sunk groove; the sunk groove is opposite to the placement cavity.

[0008] A further improvement to the above solution is that the placement cavity is provided with a first plane and a second plane. The first plane and the second plane are respectively arranged on both sides of the placement cavity, and the intersection line of the first plane and the second plane is perpendicular to each other.

[0009] A further improvement to the above solution is that the axial force eccentric induction component includes a first force sensor and a second force sensor. The first force sensor is arranged on the first plane, and the second force sensor is arranged on the second plane.

[0010] A further improvement to the above solution is that the bushing is provided with a first boss and a second boss. One end of the first force sensor is connected to the first boss, and one end of the second force sensor is connected to the second boss; a first groove is arranged inside the first boss, and one side of the first groove communicates with the bearing. A second groove is arranged inside the second boss, and one side of the second groove communicates with the bearing.

[0011] A further improvement to the above solution is that end covers, bushings, and axial force eccentric induction components are provided at both ends of the base. Both ends of the rotating shaft extend out of the end covers at both ends and are rotatably connected to the bearings inside the bushings at both ends. The axial force eccentric induction component is used for connecting the end cover and the bushing.

[0012] A further improvement to the above solution is that the axial force eccentric induction component includes a first force sensor, a second force sensor, a third force sensor, and a fourth force sensor. The first force sensor and the second force sensor are arranged on one end cover, and the third force sensor and the fourth force sensor are arranged on the other end cover; the sensing directions of the first force sensor and the third force sensor are opposite, and the sensing directions of the second force sensor and the fourth force sensor are opposite.

[0013] A further improvement to the above solution is that the rotating shaft is provided with a connecting limit ring and a connecting fixing ring. The connecting limit ring and the connecting fixing ring are opposite to form a rotor fixing part, and the rotor fixing part is used to fix the rotor assembly.

[0014] A further improvement to the above solution is that a gap is provided between the bushing and the through hole, and the size of the gap is 0.03 - 0.2 mm.

[0015] The beneficial effects of the present utility model are:

[0016] Compared with the existing motor axial force eccentricity test, the utility model provides a stable operating environment for the rotor assembly through the cavity structure built into the base, effectively isolating external interference and ensuring the reliability of the test results. The placement cavity on the end cover is designed opposite to the cavity, which not only optimizes the spatial layout but also facilitates the installation and maintenance of the axial force eccentricity sensing component, improving the overall operability of the device.

[0017] The axial force eccentricity sensing component can capture the axial eccentric force transmitted by the rotating shaft in real time and accurately. This design directly improves the accuracy of motor performance evaluation, especially in evaluating aspects such as the running stability of the motor, the wear condition of the bearing, and the axial load capacity. In addition, the combined application of the bushing and the bearing not only ensures the stability and durability of the rotating shaft during high-speed rotation but also cleverly conducts the axial eccentric force to the sensing component through its structural design, achieving precise force conversion and measurement. This design reduces energy loss, improves test efficiency, and reduces errors caused by mechanical vibration, realizing the precise test of the motor axial force eccentricity. During the test, the rotating shaft rotates at high speed to provide axial eccentric force to the axial force eccentricity sensing component to achieve the force test of axial eccentricity. The eccentric force under different rotational speeds is sensed by the gravity sensor, and the test accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional schematic diagram of the motor axial force eccentricity test device of the utility model;

[0019] Figure 2 is Figure 1 the front view schematic diagram of the motor axial force eccentricity test device in

[0020] Figure 3 is Figure 2 the sectional view taken along A-A in

[0021] Figure 4 is Figure 2 the sectional view taken along B-B in

[0022] Figure 5 is Figure 1 the exploded schematic diagram of the motor in

[0023] Figure 6 is Figure 1 the exploded schematic diagram of the motor from another perspective in

[0024] Figure 7 is Figure 1 the schematic diagram of the end cover of the motor axial force eccentricity test device in

[0025] Description of the reference numerals: base 1, cavity 11, sink 12, stator assembly 2, rotor cavity 21, end cap 3, placement cavity 31, through hole 311, first plane 312, second plane 313, convex ring 32, bushing 4, bearing 41, first boss 42, first groove 421, second boss 43, second groove 431, rotor assembly 5, rotor bracket 51, rotor magnetic tile 52, rotating shaft 6, connecting limit ring 61, connecting fixing ring 62, axial force eccentric induction assembly 7, first force sensor 71, second force sensor 72, third force sensor 73, fourth force sensor 74. Detailed implementation manners

[0026] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0027] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the description of the present invention in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As Figures 1 to 7As shown in the figure, in an embodiment of the present utility model, a motor axial force eccentricity testing device is involved, which includes a base 1, a stator assembly 2, an end cover 3, a bushing 4, a rotor assembly 5, a rotating shaft 6, and an axial force eccentricity sensing assembly 7. The base 1 is provided with a cavity 11, the rotor assembly 5 is arranged in the cavity 11, the end cover 3 is provided with a placement cavity 31, the placement cavity 31 faces the cavity 11, the axial force eccentricity sensing assembly 7 is arranged on the placement cavity 31, the placement cavity 31 is provided with a through hole 311, the bushing 4 is arranged on the through hole 311 and connected to the axial force eccentricity sensing assembly 7, the rotor assembly 5 is arranged in the stator assembly 2, one end of the rotating shaft 6 is connected to the rotor assembly 5 and the other end passes through the bushing 4, the bushing 4 is provided with a bearing 41, and the rotating shaft 6 is rotatably arranged on the bearing 41; when the rotating shaft 6 rotates, it transmits an axial eccentric force to the bushing 4 to provide an axial eccentric force to the axial force eccentricity sensing assembly 7. Through the cavity 11 structure built in the base 1 of the present utility model, a stable operating environment is provided for the rotor assembly 5, effectively isolating external interference and ensuring the reliability of the test results. The relative design of the placement cavity 31 on the end cover 3 and the cavity 11 not only optimizes the spatial layout but also facilitates the installation and maintenance of the axial force eccentricity sensing assembly 7, improving the overall operability of the device.

[0029] In this embodiment, the axial force eccentricity sensing assembly 7 can capture the axial eccentric force transmitted by the rotating shaft 6 in real time and accurately. This design directly improves the accuracy of motor performance evaluation, especially in evaluating aspects such as the smooth operation of the motor, the wear condition of the bearing 41, and the axial load capacity. In addition, the combined application of the bushing 4 and the bearing 41 not only ensures the smoothness and durability of the rotating shaft 6 during high-speed rotation but also cleverly conducts the axial eccentric force to the sensing assembly through its structural design, realizing the precise conversion and measurement of force. This design reduces energy loss, improves test efficiency, and at the same time reduces errors caused by mechanical vibration. The precise test of the motor axial force eccentricity is realized. During the test process, the rotating shaft 6 rotates at a high speed to provide an axial eccentric force to the axial force eccentricity sensing assembly 7 to achieve the test of the axial eccentricity force. The gravity sensor is used to sense the eccentric force under different rotational speeds, and the test accuracy is high.

[0030] The inner circumference of the stator assembly 2 is provided with a rotor cavity 21, and the rotor assembly 5 is arranged in the rotor cavity 21; the rotor assembly 5 includes a rotor bracket 51 and rotor magnetic tiles 52 arranged on the rotor bracket 51, and the rotor magnetic tiles 52 face the inner wall of the rotor cavity 21. In this embodiment, the carefully arranged rotor cavity 21 in the inner circumference of the stator assembly 2 provides a stable operating environment for the rotor assembly 5, ensuring that the rotor bracket 51 and the rotor magnetic tiles 52 thereon can rotate smoothly during the test, effectively reducing the vibration and noise caused by uneven structural clearances. The precise relative arrangement of the rotor magnetic tiles 52 and the inner wall of the rotor cavity 21 not only optimizes the magnetic field distribution but also enhances the electromagnetic conversion efficiency, making the axial force output more stable and controllable.

[0031] One end of the base 1 facing the end cover 3 is provided with a sunk groove 12, one end of the sunk groove 12 communicates with the cavity 11, the end cover 3 is provided with a convex ring 32, and the convex ring 32 is used to fit on the wall surface of the sunk groove 12; the sunk groove 12 is opposite to the placement cavity 31. In this embodiment, the setting of the sunk groove 12 not only optimizes the assembly process between the base 1 and the end cover 3, ensuring the precise positioning of the end cover 3, but also effectively disperses the axial force generated during the operation of the motor through its design of communicating with the cavity 11, reducing the stress concentration phenomenon caused by eccentricity. The tight fit between the convex ring 32 and the wall surface of the sunk groove 12 enhances the sealing performance, preventing the leakage of lubricating fluid or test medium during the test, ensuring the purity of the test environment and the accuracy of the data. In addition, the relative layout of the sunk groove 12 and the placement cavity 31 optimizes the force transmission path, making the axial force eccentricity test more direct and efficient, providing more reliable experimental data support for the performance evaluation of the motor.

[0032] Refer to Figure 7As shown, the placement cavity 31 is provided with a first plane 312 and a second plane 313. The first plane 312 and the second plane 313 are respectively arranged on both sides of the placement cavity 31, and the intersection lines of the first plane 312 and the second plane 313 are perpendicular to each other. The axial force eccentric induction assembly 7 includes a first force sensor 71 and a second force sensor 72. The first force sensor 71 is arranged on the first plane 312, and the second force sensor 72 is arranged on the second plane 313. Specifically, the bushing 4 is provided with a first boss 42 and a second boss 43. One end of the first force sensor 71 is connected to the first boss 42, and one end of the second force sensor 72 is connected to the second boss 43. A first groove 421 is arranged inside the first boss 42, and one side of the first groove 421 communicates with the bearing 41. A second groove 431 is arranged inside the second boss 43, and one side of the second groove 431 communicates with the bearing 41. In this embodiment, the first plane 312, the second plane 313 and their perpendicular intersection lines designed in the placement cavity 31 provide an accurate installation reference for the axial force eccentric induction assembly 7, ensuring the accuracy of the test data. By arranging the first force sensor 71 and the second force sensor 72 on the first plane 312 and the second plane 313 respectively, the accurate monitoring of the axial force of the motor in different directions is realized. This design effectively captures the subtle changes of the axial force, especially the non-uniform distributed force caused by eccentricity, providing key data support for evaluating the running stability of the motor. The design of the first boss 42 and the second boss 43 on the bushing 4 and their corresponding grooves not only stabilizes the installation of the force sensor, but also further enhances the sensitivity and real-time performance of the induction through the connection between the groove and the bearing 41. This structural design optimizes the force transmission path, reduces signal interference, and makes the test results closer to the real situation.

[0033] Both ends of the base 1 are provided with end caps 3, bushings 4, and axial force eccentricity induction components 7. Both ends of the rotating shaft 6 extend out of the end caps 3 at both ends and are rotatably connected to the bearings 41 in the bushings 4 at both ends. The axial force eccentricity induction component 7 is used for connecting the end cap 3 and the bushing 4. Specifically, the axial force eccentricity induction component 7 includes a first force sensor 71, a second force sensor 72, a third force sensor 73, and a fourth force sensor 74. The first force sensor 71 and the second force sensor 72 are arranged on one end cap 3, and the third force sensor 73 and the fourth force sensor 74 are arranged on the other end cap 3. The sensing directions of the first force sensor 71 and the third force sensor 73 are opposite, and the sensing directions of the second force sensor 72 and the fourth force sensor 74 are opposite. In this embodiment, through the precise rotational connection between the rotating shaft 6 and the bearings 41 in the bushings 4 at both ends, the stability and smoothness during rotation are ensured, laying a solid foundation for the axial force eccentricity test. Particularly crucial is the layout of the axial force eccentricity induction component 7. The four-way force sensors (the first to fourth force sensors 74) are respectively arranged on the end caps 3 at both ends, and the design of the relative sensing directions can capture the minute offsets of the axial force comprehensively and with high precision, realizing the instant feedback of the eccentric state. This not only enhances the sensitivity and accuracy of the test but also helps to quickly locate the cause of eccentricity, providing strong support for subsequent adjustment and optimization.

[0034] The rotating shaft 6 is provided with a connecting limit ring 61 and a connecting fixing ring 62. The connecting limit ring 61 and the connecting fixing ring 62 are opposite to form a rotor fixing part, and the rotor fixing part is used for fixing the rotor assembly 5. In this embodiment, through the precisely aligned limit ring and fixing ring, the position of the rotor assembly 5 is effectively locked, ensuring that the rotor can still maintain good coaxiality under high-speed rotation and different load conditions, thereby minimizing the axial force measurement error caused by rotor offset. In addition, this fixing structure also enhances the overall rigidity of the rotor assembly 5, making the rotor movement more stable during the test and helping to capture and analyze the subtle axial force changes.

[0035] A gap is provided between the bushing 4 and the through hole 311, and the size of the gap is 0.03 - 0.2 mm. In this embodiment, the gap not only effectively reduces the friction and jamming phenomena caused by manufacturing or assembly errors, ensuring the smooth rotation of the motor during the test, but also significantly improves the sensitivity and response speed of the device to axial force eccentricity changes. By finely adjusting the size of the gap, the minute offsets of the motor shaft in the actual working environment can be more accurately simulated, thereby accurately evaluating the stability and durability of the motor.

[0036] The above embodiments only illustrate several implementation manners of the present utility model, and the description thereof is relatively specific and detailed. However, it should not be construed as a limitation to the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several variations and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model shall be subject to the appended claims.

Claims

1. An axial force eccentricity test device for an electric motor, characterized in that: It includes a base, a stator assembly, an end cover, a bushing, a rotor assembly, a rotating shaft, and an axial force eccentricity sensing assembly. The base is provided with a cavity, the rotor assembly is arranged in the cavity, the end cover is provided with a placement cavity, the placement cavity faces the cavity, the axial force eccentricity sensing assembly is arranged on the placement cavity, the placement cavity is provided with a through hole, the bushing is arranged on the through hole and connected to the axial force eccentricity sensing assembly, the rotor assembly is arranged inside the stator assembly, one end of the rotating shaft is connected to the rotor assembly and the other end passes through the bushing, the bushing is provided with a bearing, and the rotating shaft is rotatably arranged on the bearing; when the rotating shaft rotates, it transmits an axial eccentric force to the bushing to provide an axial eccentric force to the axial force eccentricity sensing assembly.

2. The axial force eccentricity test device for a motor according to claim 1, wherein: The inner circumference of the stator assembly is provided with a rotor cavity, and the rotor assembly is arranged in the rotor cavity; the rotor assembly includes a rotor bracket and rotor magnetic tiles arranged on the rotor bracket, and the rotor magnetic tiles face the inner wall of the rotor cavity.

3. The axial force eccentricity testing device for the motor according to claim 1, wherein: One end of the base facing the end cover is provided with a sunk groove, one end of the sunk groove communicates with the cavity, the end cover is provided with a convex ring, and the convex ring is used to fit on the wall surface of the sunk groove; the sunk groove faces the placement cavity.

4. The motor axial force eccentricity testing device according to claim 1, characterized in that: The placement cavity is provided with a first plane and a second plane, the first plane and the second plane are respectively arranged on both sides of the placement cavity, and the intersection line of the first plane and the second plane is perpendicular to each other.

5. The motor axial force eccentricity test device according to claim 4, characterized in that: The axial force eccentricity sensing assembly includes a first force sensor and a second force sensor, the first force sensor is arranged on the first plane, and the second force sensor is arranged on the second plane.

6. The motor axial force eccentricity test device according to claim 5, wherein: The bushing is provided with a first boss and a second boss, one end of the first force sensor is connected to the first boss, and one end of the second force sensor is connected to the second boss; a first groove is arranged inside the first boss, one side of the first groove communicates with the bearing, a second groove is arranged inside the second boss, and one side of the second groove communicates with the bearing.

7. The axial force eccentricity testing device for an electric machine according to claim 1, characterized in that: Both ends of the base are provided with an end cover, a bushing, and an axial force eccentricity sensing assembly. Both ends of the rotating shaft extend out of the end covers at both ends and are rotatably connected to the bearings inside the bushings at both ends. The axial force eccentricity sensing assembly is used to connect the end cover and the bushing.

8. The motor axial force eccentricity test device according to claim 7, wherein: The axial force eccentricity sensing assembly includes a first force sensor, a second force sensor, a third force sensor, and a fourth force sensor. The first force sensor and the second force sensor are arranged on one end cover, and the third force sensor and the fourth force sensor are arranged on the other end cover; the sensing directions of the first force sensor and the third force sensor are opposite, and the sensing directions of the second force sensor and the fourth force sensor are opposite.

9. The axial force eccentricity test device for a motor according to claim 1, characterized in that: The rotating shaft is provided with a connection limit ring and a connection fixing ring, the connection limit ring and the connection fixing ring are opposite to each other to form a rotor fixing part, and the rotor fixing part is used to fix the rotor assembly.

10. The motor axial force eccentricity testing device according to claim 1, wherein: A gap is provided between the bushing and the through hole, and the size of the gap is 0.03 - 0.2 mm.

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