Stator assembly test fixture

Abstract

The utility model relates to a kind of stator assembly test tool of stable structure, convenient assembly, including detachably connected base and gantry support, the installation site of being adapted to the bottom of stator assembly is provided on base, the top plate of gantry support extends support rod towards base direction, the lower part of support rod passes through stator assembly center through hole and is inserted with base, impeller with magnet is set on the support rod between stator assembly and top plate, impeller is made into axial limit, axial rotation cooperation with support rod by bearing. First, stator assembly is placed on the installation site of base, then gantry support is installed with impeller on base, support rod connects gantry support, impeller and stator assembly together at this time, to ensure the coaxiality of impeller and stator assembly, ensure that test result reliability. Wherein the design of gantry support, impeller modularization, structure is stable and simple, and assembly is convenient, and it is convenient to replace multiple sizes of stator assembly to test different specifications of stator assembly.

Description

Technical Field

[0001] This utility model relates to the field of motor design technology, specifically to a stator assembly testing fixture. Background Technology

[0002] As a third-generation artificial heart, the levitation blood pump is implanted at the apex of the heart. It uses magnetic levitation technology to suspend the impeller within the pump chamber, eliminating mechanical wear and effectively delivering blood. Its small size and good blood compatibility make it a promising candidate for widespread applications. The stator assembly, as the core component of the magnetic levitation blood pump, directly determines the pump's speed, safety, and other performance aspects due to its performance (such as the suitability of the magnet's magnetism and size, the appropriateness of the gap between the stator teeth and the magnet, whether the designed rotational speed can be achieved, and whether stable drive is possible). Therefore, these performance characteristics need to be tested during the design process. Utility Model Content

[0003] The purpose of this invention is to provide a stator assembly testing fixture that is structurally stable and easy to assemble.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a stator assembly testing fixture, comprising a detachably connected base and a gantry bracket. The base is provided with an installation position adapted to the bottom of the stator assembly. A support rod extends from the top plate of the gantry bracket toward the base. The lower part of the support rod passes through the central through hole of the stator assembly and is inserted into the base. An impeller with a magnet is provided on the support rod between the stator assembly and the top plate. The impeller and the support rod are axially limited and axially rotated through a bearing.

[0005] The mounting position includes a groove on the base, a fixing column is provided in the middle of the groove protruding upward, the bottom of the fixing column is inserted into the groove, and the stator assembly is sleeved on the outer periphery of the fixing column.

[0006] The top plate has a downwardly protruding extension with a Y-shaped cross section, including a journal section and a connecting section. The bearing is fixed on the journal section. A through hole passes through the top plate and the middle of the extension, and the core of the through hole is arranged in a vertical direction. The support rod passes through the through hole and the center hole of the fixed column is inserted into the base.

[0007] The support rod consists of a large-diameter section at the top and a small-diameter section at the bottom.

[0008] The impeller includes an upper plate, a lower plate, and blades between them. The upper plate is fitted with a bearing in the middle, and the lower plate has an annular notch in the middle for accommodating the upper part of the stator assembly. The magnet is embedded in the lower plate and is arranged corresponding to the outer periphery of the upper part of the stator assembly.

[0009] The support rod is located at the center of the gantry frame.

[0010] In the above scheme, the stator assembly is first placed in the mounting position on the base, and then the gantry bracket along with the impeller is installed on the base. At this time, the support rod connects the gantry bracket, impeller, and stator assembly together, thereby ensuring the coaxiality of the impeller and stator assembly and ensuring the reliability of the test results. The modular design of the gantry bracket and impeller is structurally stable and simple, easy to assemble, and facilitates the replacement of stator assemblies of various sizes to test the performance of stator assemblies of different specifications. Attached Figure Description

[0011] Figure 1 A 3D view of the test fixture;

[0012] Figure 2 A schematic diagram of the working state of the test fixture;

[0013] Figure 3 for Figure 2 A sectional view.

[0014] In the diagram: 10-base, 11-mounting position, 111-groove, 112-fixed column, 20-gantry bracket, 21-top plate, 22-support rod, 23-extension, 231-journal section, 232-connecting section, 30-impeller, 31-magnet, 32-upper plate, 33-lower plate, 34-blade, 40-bearing, A-stator assembly. Detailed Implementation

[0015] See Figures 1-3 A stator assembly testing fixture includes a detachably connected base 10 and a gantry bracket 20. The base 10 has a mounting position 11 adapted to the bottom of the stator assembly A. A support rod 22 extends from the top plate 21 of the gantry bracket 20 toward the base 10. The lower part of the support rod 22 passes through a central through-hole in the stator assembly A and is inserted into the base 10. An impeller 30 with a magnet 31 is mounted on the support rod 22 between the stator assembly A and the top plate 21. The impeller 30 and the support rod 22 are axially limited and axially rotated via a bearing 40. In use, the stator assembly A is first placed on the mounting position 11 of the base 10, and then the gantry bracket 20 along with the impeller 30 is installed onto the base 10. At this time, the support rod 22 connects the gantry bracket 20, the impeller 30, and the stator assembly A together, thereby ensuring the coaxiality of the impeller 30 and the stator assembly A and ensuring the reliability of the test results. The modular design of the gantry bracket 20 and impeller 30 is stable and simple, easy to assemble, and facilitates the replacement of stator components of various sizes to test the performance of stator components of different specifications.

[0016] The mounting position 11 includes a groove 111 on the base, a fixing column 112 is provided in the middle of the groove 111, the bottom of the fixing column 112 is inserted into the groove 111, and the stator assembly A is sleeved on the outer periphery of the fixing column 112.

[0017] As a preferred embodiment of this utility model, the top plate 21 is provided with an extension 23 extending downward. The extension 23 has a Y-shaped cross-section and includes a journal section 231 and a connecting section 232. The bearing 40 is fixed on the journal section 231. The journal section 231 with a smaller outer diameter is used to install the impeller 30 and the bearing 40, while the connecting section 232 with a larger outer diameter is directly fixed to the top plate 21. Preferably, the extension 23 and the top plate 21 are designed as an integral structure to ensure connection strength. A through hole (not shown in the figure) penetrates the top plate 21 and the middle of the extension 23, and the core of the through hole a is arranged in a vertical direction. The support rod 22 passes through the through hole, the center hole of the fixing column 112, and is then inserted into the base 10. That is to say, the support rod 23 can be pulled out from the through hole, which facilitates the installation and disassembly of the tooling. The direction of the core of the through hole limits the position of the core of the support rod 22 in the vertical direction, ensuring the concentricity of the stator assembly A and the impeller 30.

[0018] In order to be radially adapted to the center hole of stator assembly A, the support rod 22 includes an upper large-diameter section and a lower small-diameter section to ensure the stable and reliable position of stator assembly A during testing.

[0019] To mate with the bearing 40 and stator assembly A, the impeller 30 includes an upper plate 32, a lower plate 33, and blades 34 between them. The upper plate 32 mates with the bearing 40 in the middle, and the lower plate 33 has an annular notch in the middle to accommodate the upper part of the stator assembly A. The magnet 31 is embedded in the lower plate 33 and is positioned corresponding to the outer circumference of the upper part of the stator assembly A. The shape of the impeller in the magnetic levitation blood pump is similar to that of the impeller 30 in the tooling, except that the diameter of the through hole in the middle is equal. Here, it is located to mate with the bearing 40. The diameter of the hole in the middle of the upper plate 32 is much smaller than the diameter of the annular notch in the middle of the lower plate 33. The lower plate 33 has a magnet 31 embedded in it, which controls the current in the coil of the stator assembly A, drives the magnet 31 to rotate the impeller 30, and thus tests the performance of the stator assembly A.

[0020] During testing, if it is necessary to adjust the axial height of stator assembly A, the axial height of impeller 30 can be easily adjusted to adapt to the corresponding position of stator teeth and magnet 31; if the diameter of impeller 30 needs to be changed, the original impeller 30 can be easily replaced.

[0021] To further improve the stability of the entire testing system, the support rod 22 is set at the center of the gantry bracket 20. In this way, the entire impeller 30 and stator assembly A are located at the central axis of the gantry bracket 20, the entire testing fixture is subjected to balanced forces, runs stably, and the test results are reliable.

Claims

1. A stator assembly testing fixture, characterized in that: The system includes a detachable base (10) and a gantry bracket (20). The base (10) has a mounting position (11) that is adapted to the bottom of the stator assembly (A). The top plate (21) of the gantry bracket (20) extends a support rod (22) toward the base (10). The lower part of the support rod (22) passes through the central through hole of the stator assembly (A) and is inserted into the base (10). An impeller (30) with a magnet (31) is provided on the support rod (22) between the stator assembly (A) and the top plate (21). The impeller (30) and the support rod (22) form an axial limiting and axial rotation cooperation through the bearing (40).

2. The stator assembly testing fixture according to claim 1, characterized in that: The mounting position (11) includes a groove (111) on the base, a fixed column (112) is provided in the middle of the groove (111) protruding upward, the bottom of the fixed column (112) is inserted into the groove (111), and the stator assembly (A) is sleeved on the outer periphery of the fixed column (112).

3. The stator assembly testing fixture according to claim 2, characterized in that: The top plate (21) is provided with an extension (23) extending downward. The extension (23) has a Y-shaped cross section, including a journal section (231) and a connecting section (232). The bearing (40) is fixed on the journal section (231). The through hole passes through the top plate (21) and the middle of the extension (23), and the core of the through hole is arranged in a vertical direction. The support rod (22) passes through the through hole and the center hole of the fixed column (112) and is inserted into the base (10).

4. The stator assembly testing fixture according to claim 1, characterized in that: The support rod (22) includes a large-diameter section at the top and a small-diameter section at the bottom.

5. The stator assembly testing fixture according to claim 1, characterized in that: The impeller (30) includes an upper plate (32), a lower plate (33) and blades (34) between them. The upper plate (32) is fitted with a bearing (40) in the middle. The lower plate (33) has an annular notch in the middle for accommodating the upper part of the stator assembly (A). The magnet (31) is embedded in the lower plate (33) and is arranged corresponding to the outer periphery of the upper part of the stator assembly (A).

6. The stator assembly testing fixture according to claim 1, characterized in that: The support rod (22) is located at the center of the gantry bracket (20).

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