Rotor performance test tool of bearingless permanent magnet motor

Abstract

The utility model relates to the technical field of motors, and discloses a rotor performance test tool for a bearingless permanent magnet motor, which comprises a stator assembly and a fulcrum shaft assembly, and is characterized in that the fulcrum shaft assembly comprises a bottom plate, a bearing seat arranged on the bottom plate, a bearing arranged in the bearing seat and a rotating shaft rotationally connected with the bearing; the stator assembly comprises a casing, a stator iron core arranged in the casing, a stator winding arranged on the stator iron core, and an end cover arranged at one end part of the casing, the middle part of the end cover is provided with a through hole through which the rotating shaft passes, and the end cover is connected with the top of the bearing seat through a first screw. According to the rotor performance test tool, main assembly can be completed through screw connection of the end cover and the bearing seat, and subsequent operation of installing the rotor on the rotating shaft is also simple and convenient. The performance of the rotor can be effectively detected before the rotor leaves a factory, and the problems of the rotor can be found in time, so that the product quality is strictly controlled in the production link, and the outflow of defective products is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field, especially a rotor performance test frock of bearingless permanent magnet motor. BACKGROUND

[0002] The existing air compressor integrated machine motor is mostly bearingless structure, which leads to that the motor needs to be installed into a complete machine at the customer end to carry out performance test in the production process.

[0003] The motor rotor lacks corresponding complete machine rotor performance detection means after installing the magnetic steel and assembling. At present, whether the reverse magnetic phenomenon exists can be determined only by detecting the magnetic pole, however, the uniformity of the magnetic field and whether the magnetic flux reaches the predetermined index are difficult to effectively detect and evaluate, which is obviously a key part to be improved in the prior art.

[0004] Since the motor can be tested only after being installed into a complete machine at the customer site at present, the complete machine needs to be disassembled basically once the adverse situation occurs, and then the magnetic flux of the rotor magnetic steel is tested one by one. This test method not only consumes time and effort, increases production cost and time cost, but also needs to use this cumbersome detection method for the rotor of the after-sales machine.

[0005] Therefore, it is urgent to develop a rotor performance test frock of bearingless permanent magnet motor, which can effectively detect the performance of the rotor before leaving the factory. UTILITY MODEL CONTENTS

[0006] In view of the above deficiencies of the prior art, the utility model aims to provide a rotor performance test frock of bearingless permanent magnet motor, which aims to solve the technical problem that the rotor cannot be detected after installing the magnetic steel and assembling.

[0007] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0008] A rotor performance test frock of bearingless permanent magnet motor, comprising a stator assembly and a shaft support assembly, the shaft support assembly comprising a bottom plate, a bearing seat arranged on the bottom plate, a bearing arranged in the bearing seat, and a rotating shaft rotatably connected with the bearing, the stator assembly comprising a machine shell, a stator core arranged in the machine shell, a stator winding arranged on the stator core, and an end cover arranged at one end of the machine shell, the end cover being provided with a through hole for the rotating shaft to pass through and the end cover being connected with the top of the bearing seat through a first screw.

[0009] As a further improvement of the above technical solution, the end cover is arranged with a plurality of first mounting holes in a peripheral circumferential array at the outer periphery of the through hole, the top of the bearing seat is provided with a same number of first threaded holes as the first mounting holes and corresponding to the first mounting holes, a first screw is arranged at each first mounting hole and connected with the corresponding first threaded hole.

[0010] As a further improvement of the above technical solution, the rotating shaft comprises a rotor mounting section, a limiting section and a bearing mounting section connected in sequence, and the diameters of the limiting section, the bearing mounting section and the rotor mounting section are sequentially reduced.

[0011] As a further improvement of the above technical solution, the bearing mounting section is sleeved with at least two bearings, the adjacent bearings are separated by a retainer, the uppermost bearing is pressed against the limiting section, and the bottom end of the bearing mounting section is provided with a pressing piece for pressing the lowermost bearing.

[0012] As a further improvement of the above technical solution, the rotor mounting section is connected with the rotor through a key.

[0013] As a further improvement of the above technical solution, the bottom plate is arranged with a plurality of second mounting holes in a peripheral circumferential array at the outer periphery of the avoiding hole, the bottom of the bearing seat is provided with a same number of second threaded holes as the second mounting holes and corresponding to the second mounting holes, a second screw is arranged at each second mounting hole and connected with the corresponding second threaded hole.

[0014] As a further improvement of the above technical solution, the second mounting hole is a countersunk hole structure, and the head of the second screw is hidden in the second mounting hole of the bottom plate.

[0015] As a further improvement of the above technical solution, one end of the bottom plate extends outwardly and transversely and the end portion forms an arc edge.

[0016] The rotor performance test tool provided by the utility model can complete main assembly through screw connection of the end cover and the bearing seat, and the operation of installing the rotor on the rotating shaft is relatively simple, thereby reducing the working difficulty of the operator. The rotor performance can be effectively detected before the rotor is delivered, and problems of the rotor can be found in time, so that the product quality can be strictly controlled in the production link, and the flow of defective products is reduced, and the status that performance test can be performed only after the whole machine is installed at the client end is changed. The complicated process that the whole machine needs to be disassembled and the rotor magnetic steel magnetic flux needs to be tested one by one due to the poor performance of the rotor is avoided, production cost and time cost are greatly saved, and production efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1The utility model provides a rotor performance test frock's schematic diagram after rotor is installed.

[0018] Figure 2 The utility model provides a rotor performance test frock's bottom structure schematic view.

[0019] Figure 3 It is the assembly drawing of stator assembly and support shaft assembly.

[0020] Figure 4 It is the structure schematic view of stator assembly.

[0021] Figure 5 It is the structure schematic view of support shaft assembly.

[0022] Figure 6 It is the structure schematic view of bearing sleeve on the rotating shaft.

[0023] Main element symbol explanation: 1 - stator assembly, 11 - casing, 12 - stator core, 13 - stator winding, 14 - end cover, 141 - first mounting hole, 142 - through hole, 2 - support shaft assembly, 21 - bottom plate, 211 - arc edge, 212 - avoiding hole, 22 - bearing seat, 221 - first threaded hole, 23 - bearing, 24 - rotating shaft, 241 - rotor mounting section, 242 - limiting section, 243 - bearing mounting section, 25 - baffle, 26 - pressing piece, 31 - first screw, 32 - second screw, 33 - key, 4 - rotor. DETAILED DESCRIPTION

[0024] The utility model provides a rotor performance test frock of bearingless permanent magnet motor, for the purpose, technical scheme and effect of the utility model more clearly, explicitly, the following refers to the drawing and raises example to the utility model further detailed explanation. It should be understood that the specific embodiment described here is only used to explain the utility model, and is not used to limit the protection scope of the utility model.

[0025] Please refer to Figures 1 to 6 The utility model provides a rotor performance test frock of bearingless permanent magnet motor, including stator assembly 1 and support shaft assembly 2, the support shaft assembly 2 includes bottom plate 21, sets up the bearing seat 22 on bottom plate 21, sets up the bearing 23 in bearing seat 22, and the rotating shaft 24 is connected with bearing 23, the stator assembly 1 includes casing 11, sets up the stator core 12 in casing 11 and sets up the stator winding 13 on stator core 12, and sets up the end cover 14 at one end of casing 11, the middle part of end cover 14 is equipped with the through hole 142 for rotating shaft 24 passes through and end cover 14 is connected with the top of bearing seat 22 through first screw 31.

[0026] When the bearingless permanent magnet motor rotor performance testing fixture is in operation, it first assembles the stator assembly 1 and the support shaft assembly 2 by connecting the end cover 14 to the bearing housing 22 using the first screw 31, thus constructing a stable test structure framework. Then, the rotor 4 to be tested is installed on the shaft 24. When the fixture is energized, the stator winding 13 generates a rotating magnetic field. According to the principle of electromagnetic induction, this rotating magnetic field interacts with the rotor 4, causing the rotor 4 to begin rotating on the shaft 24. During the rotation of the rotor 4, its various performance indicators can be tested and evaluated to determine whether the rotor 4's performance meets the standards.

[0027] Compared with existing technologies, the rotor performance testing fixture provided by this utility model can be mainly assembled by connecting the end cover 14 and the bearing seat 22 with screws. The subsequent docking operation between the rotor 4 and the shaft 24 is also relatively simple, reducing the workload of operators. The performance of the rotor 4 can be effectively tested before it leaves the factory, allowing for timely detection of problems. This enables strict quality control during the production process, reducing the outflow of defective products and changing the previous situation where performance testing could only be performed after the entire machine was assembled at the customer's site. This avoids the cumbersome process of disassembling the entire machine and testing the magnetic flux of each magnet in the rotor 4 individually due to poor rotor performance, greatly saving production costs and time, and improving production efficiency.

[0028] For details, please refer to Figures 3 to 5 The end cap 14 has multiple first mounting holes 141 arranged in a circumferential array around the through hole 142. The top of the bearing seat 22 has the same number of first threaded holes 221 as the first mounting holes 141, and each first mounting hole 141 is equipped with a first screw 31 and connected to the corresponding first threaded hole 221, forming multiple evenly distributed connection points. This circumferential array connection method can make the force between the end cap 14 and the bearing seat 22 more uniform, avoiding problems such as loosening or deformation of the connection due to uneven force, greatly improving the stability and reliability of the connection between the stator assembly 1 and the support shaft assembly 2, and ensuring that the entire tooling structure is stable during the rotor 4 performance test, and the accuracy of the test results will not be affected by problems at the connection points.

[0029] For details, please refer to Figure 6The rotating shaft 24 includes a rotor mounting section 241, a limiting section 242, and a bearing mounting section 243 connected in sequence, with the diameters of the limiting section 242, bearing mounting section 243, and rotor mounting section 241 decreasing sequentially. The diameter of the rotor mounting section 241 provides a stable mounting base for the rotor 4, facilitating accurate installation and ensuring the stability of the rotor 4 installation. The limiting section 242 precisely restricts the axial position of the rotor 4 on the rotating shaft 24, preventing axial movement of the rotor 4 during rotation and ensuring the positional accuracy of the rotor 4 during testing, thereby improving the accuracy of the test results.

[0030] For further details, please refer to [link / reference]. Figure 6 The bearing mounting section 243 is fitted with at least two bearings 23. Compared to a single bearing 23, multiple bearings 23 provide stronger support and effectively distribute the radial and axial loads borne by the rotating shaft 24 during rotation. Adjacent bearings 23 are separated by retaining rings 25, ensuring that each bearing 23 is in the correct working position and preventing friction or collision between bearings 23, further enhancing the stability of the entire support structure. The uppermost bearing 23 presses against the limiting section 242, and the bottom of the bearing mounting section 243 has a pressure plate 26 that presses against the lowermost bearing 23. This double constraint effectively prevents the bearings 23 from axial displacement, making the rotating shaft 24 more stable during rotation, reducing vibration and noise, improving the stability of the tooling operation, and providing more reliable conditions for accurately testing the performance of the rotor 4.

[0031] In this embodiment, refer to Figure 1 The rotor mounting section 241 is connected to the rotor 4 via a key 33. The key 33 can be embedded in the corresponding keyways 244 of the rotor mounting section 241 and the rotor 4, forming a tight fit. This connection method effectively prevents relative rotation or axial displacement of the rotor 4 on the rotor mounting section 241 of the shaft 24, ensuring a stable connection between the rotor 4 and the shaft 24 during testing, providing a solid foundation for accurately testing the performance of the rotor 4. Even under complex operating conditions such as high speed and high torque, the key 33 connection ensures that the rotor 4 reliably follows the shaft 24 without loosening or falling off, greatly improving the safety and reliability of the tooling operation.

[0032] In fact, the tooling was placed on a table for testing, see Figure 2As shown, the base plate 21 has clearance holes 212 to avoid interference between the pressure plate 26 and the table surface, ensuring that the base plate 21 can make flat contact with the table surface and guaranteeing the stability of the fixture during testing. The base plate 21 has multiple second mounting holes arranged in a circumferential array around the clearance holes. The bottom of the bearing seat 22 has the same number of second threaded holes as the second mounting holes, and each second mounting hole has a second screw 32 connected to the corresponding second threaded hole. This evenly distributed connection method further enhances the connection stability between the base plate 21 and the bearing seat 22, preventing displacement or shaking of the fixture during operation due to vibration or other reasons, and providing a stable foundation environment for accurately testing the performance of the rotor 4.

[0033] When the fixture is placed on the table for testing, if the head of the second screw 32 protrudes, it will not only easily scratch the surface of the table during the movement or placement of the fixture, but may also cause instability in the placement of the fixture on the table, especially when vibration occurs during the operation of the fixture. Therefore, the head of the second screw 32 is hidden in the second mounting hole of the base plate 21. The countersunk hole structure prevents the head of the second screw 32 from contacting the table, making the contact between the fixture and the table more stable, ensuring the stability of the fixture during the testing process, and providing reliable conditions for accurately testing the performance of the rotor 4.

[0034] Preferred options, please refer to Figure 5 One end of the base plate 21 extends laterally outward, forming an arc edge 211. During rotor 4 performance testing, the fixture may experience severe vibrations due to motor operation and other factors. The arc edge 211 extension structure of the base plate 21, in conjunction with the external clamp, greatly enhances the fixture's resistance to vibration. The tight fit between the clamp and the arc edge 211 effectively restricts the fixture's displacement in all directions, ensuring its stability even under high-intensity vibration conditions. This not only helps ensure the accuracy of test data.

[0035] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this utility model, and all such substitutions or changes should fall within the protection scope of this utility model.

Claims

1. A rotor performance testing fixture for a bearingless permanent magnet motor, comprising a stator assembly and a support shaft assembly, characterized in that, The support shaft assembly includes a base plate, a bearing housing disposed on the base plate, a bearing disposed in the bearing housing, and a rotating shaft rotatably connected to the bearing. The stator assembly includes a housing, a stator core disposed in the housing, a stator winding disposed on the stator core, and an end cover disposed at one end of the housing. The end cover has a through hole in the middle for the rotating shaft to pass through, and the end cover is connected to the top of the bearing housing by a first screw.

2. The rotor performance testing fixture for a bearingless permanent magnet motor according to claim 1, characterized in that, The end cap has a plurality of first mounting holes arranged in a circumferential array around the through hole. The top of the bearing seat has a first threaded hole that is the same number as the number of the first mounting holes and corresponds one-to-one. A first screw is provided at each first mounting hole and is connected to the corresponding first threaded hole.

3. The rotor performance testing fixture for a bearingless permanent magnet motor according to claim 1, characterized in that, The rotating shaft includes a rotor mounting section, a limiting section, and a bearing mounting section connected in sequence, with the diameters of the limiting section, bearing mounting section, and rotor mounting section decreasing sequentially.

4. The rotor performance testing fixture for a bearingless permanent magnet motor according to claim 3, characterized in that, The bearing mounting section is fitted with at least two bearings, with adjacent bearings separated by retaining rings. The uppermost bearing presses against the limiting section. The bottom end of the bearing mounting section is provided with a pressure plate, which is used to press the lowermost bearing.

5. The rotor performance testing fixture for a bearingless permanent magnet motor according to claim 3, characterized in that, The rotor mounting section is connected to the rotor via a key.

6. The rotor performance testing fixture for a bearingless permanent magnet motor according to claim 4, characterized in that, The base plate has clearance holes for avoiding the pressure plate. The base plate has a plurality of second mounting holes arranged in a circumferential array around the clearance holes. The bottom of the bearing seat has a number of second threaded holes that are the same as the number of second mounting holes and correspond one-to-one. A second screw is provided at each second mounting hole and is connected to the corresponding second threaded hole.

7. The rotor performance testing fixture for a bearingless permanent magnet motor according to claim 6, characterized in that, The second mounting hole is a countersunk hole structure, and the head of the second screw is hidden in the second mounting hole of the base plate.

8. The rotor performance testing fixture for a bearingless permanent magnet motor according to claim 6 or 7, characterized in that, One end of the base plate extends laterally outward and forms an arc edge at that end.

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