A magnetic levitation motor assembly

Abstract

The utility model relates to a kind of magnetic suspension motor assembly, including motor shell, motor stator of press fitting in motor shell, motor rotor and the magnetic suspension bearing module installed in the both ends of motor shell;The inner chamber one end of motor shell is provided with the annular axial limiting step of inward bulge;Motor shell is by interference fit, and motor stator is hot mounted in the motor stator installation inner chamber hole in motor shell, and the end face of one end of motor stator is in abutment with annular axial limiting step;The inner chamber of motor shell is integrated with helical cooling flow channel;Magnetic suspension bearing module is installed on the bearing mounting position in motor shell, and motor rotor is suspended by magnetic suspension bearing module Support.Equipment motor shell and motor stator adopt interference fit and axial limiting step positioning, with higher connection stiffness, and realize accurate axial and radial positioning of motor stator.Helical cooling flow channel and the motor shell of high-thermal-conductivity aluminum alloy synergistic effect, efficiently for motor stator and magnetic suspension bearing module cooling.

Description

Technical Field

[0001] This utility model relates to a magnetic levitation motor assembly, and relates to the fields of high-speed motors and magnetic levitation technology. Background Technology

[0002] Magnetic levitation centrifuges are widely used due to their advantages such as high efficiency, energy saving, oil-free operation, and frictionless operation. Their core component, the magnetic levitation motor assembly, typically consists of two parts: the motor itself and the magnetic levitation bearing system. The performance of the centrifuge highly depends on the precise coordination of these two components.

[0003] In terms of structural precision, the split design leads to poor consistency of reference standards. The separate machining of the motor stator mounting holes and the magnetic levitation bearing module mounting holes results in cumulative errors, making it difficult to guarantee coaxiality requirements. This may lead to uneven electromagnetic air gap and bearing air gap, affecting rotor dynamic performance and system stability.

[0004] In terms of thermal management, the split structure requires separate cooling paths for the motor and magnetic bearing module, which increases structural complexity, leakage risk and manufacturing cost.

[0005] In terms of assembly process, the assembly of motor stator and motor housing is mostly carried out by clearance fit with thermally conductive adhesive filling or bolt fastening, which has problems such as high assembly stress, high thermal resistance and difficulty in ensuring positioning accuracy.

[0006] Therefore, there is an urgent need for a highly integrated solution that can coordinate and optimize structural accuracy, thermal management efficiency, and assembly reliability to meet the high-performance development requirements of magnetic levitation centrifugal compressors. Utility Model Content

[0007] In view of the shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide a magnetic levitation motor assembly. This solution integrates the motor stator and magnetic levitation bearing module into one unit through an innovative motor housing design, and is supplemented by a high-efficiency spiral cooling channel, thereby achieving synergistic optimization of structural precision, thermal management and assembly process, so as to improve the performance of the magnetic levitation centrifugal compressor.

[0008] To solve the above-mentioned technical problems, the technical solution of this utility model is: a magnetic levitation motor assembly, including a motor housing, a motor stator pressed into the motor housing, a motor rotor, and magnetic levitation bearing modules installed at both ends of the motor housing; The inner cavity of the motor housing is provided with an inwardly protruding annular axial limiting step at one end; The motor housing is heat-fitted into the motor stator mounting cavity in the motor housing by an interference fit, and one end face of the motor stator abuts against the annular axial limiting step. The inner cavity of the motor housing is integrated with a spiral cooling channel; The magnetic levitation bearing module is installed in the bearing mounting position in the motor housing, and the motor rotor is suspended and supported by the magnetic levitation bearing module.

[0009] Preferably, the motor housing is cylindrical in shape.

[0010] Preferably, the spiral cooling channel is connected to threaded coolant interfaces at both ends, one of which is a coolant inlet and the other is a coolant outlet. The two threaded coolant interfaces are located on the outer wall of the motor housing near the base.

[0011] Preferably, the motor housing is made of A356-T6 aluminum alloy.

[0012] Preferably, the interference fit has an interference amount of 0.117 mm to 0.223 mm.

[0013] Preferably, the cross-section of the spiral cooling channel is semi-elliptical.

[0014] Preferably, flanges are provided at both outer ends of the motor housing.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The motor housing and stator employ an interference fit and axial limiting step positioning, providing high connection rigidity and achieving accurate axial and radial positioning of the motor stator. Furthermore, the inner cavity of the motor housing is machined in a single clamping operation, greatly ensuring coaxiality. Using this as a reference, the motor rotor and magnetic levitation bearing module are mounted, ensuring the uniformity of the motor air gap and bearing air gap, thus improving the operational stability of the magnetic levitation centrifugal compressor. Simultaneously, the spiral cooling channel and the high thermal conductivity aluminum alloy motor housing work synergistically to efficiently cool the motor stator and magnetic levitation bearing module. This design offers advantages such as rapid heat conduction, simple structure, and low leakage risk.

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 1 .

[0018] Figure 2 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 2 .

[0019] Figure 3 for Figure 2 A magnified view of part A.

[0020] Figure 4This is a schematic diagram of the structure of the motor housing in an embodiment of the present invention. Figure 1 .

[0021] Figure 5 This is a schematic diagram of the structure of the motor housing in an embodiment of the present invention. Figure 2 .

[0022] In the diagram: 1. Motor housing; 11. Motor stator mounting cavity; 12. Annular axial limiting step; 13. Spiral cooling channel; 14. Coolant inlet; 15. Coolant outlet; 16. Bearing mounting position; 17. Flange; 2. Motor stator; 3. Motor rotor; 4. Magnetic levitation bearing module. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0025] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] like Figures 1-5 As shown, this embodiment provides a magnetic levitation motor assembly, specifically an integrated motor assembly for a magnetic levitation centrifugal compressor, including a motor housing, a motor stator pressed into the motor housing, a motor rotor, and magnetic levitation bearing modules mounted at both ends of the motor housing; The inner cavity of the motor housing is provided with an inwardly protruding annular axial limiting step at one end; The motor housing is heat-fitted into the motor stator mounting cavity in the motor housing by an interference fit, and one end face of the motor stator abuts against the annular axial limiting step. The inner cavity of the motor housing is integrated with a spiral cooling channel; The magnetic levitation bearing module is installed in the bearing mounting position in the motor housing, and the motor rotor is suspended and supported by the magnetic levitation bearing module. The motor housing is cylindrical in shape. The spiral cooling channel is connected to threaded coolant interfaces at both ends. One threaded coolant interface is a coolant inlet, and the other threaded coolant interface is a coolant outlet. The two threaded coolant interfaces are located on the outer wall of the motor housing near the base.

[0027] The motor housing and stator employ an interference fit and axial limiting step positioning, providing high connection rigidity and achieving accurate axial and radial positioning of the motor stator. Furthermore, the inner cavity of the motor housing is machined in a single clamping operation, greatly ensuring coaxiality. Using this as a reference, the motor rotor and magnetic levitation bearing module are mounted, ensuring the uniformity of the motor air gap and bearing air gap, thus improving the operational stability of the magnetic levitation centrifugal compressor. Simultaneously, the spiral cooling channel and the high thermal conductivity aluminum alloy motor housing work synergistically to efficiently cool the motor stator and magnetic levitation bearing module. This design offers advantages such as rapid heat conduction, simple structure, and low leakage risk.

[0028] In this embodiment of the utility model, the motor housing is made of A356-T6 aluminum alloy by casting and precision machining.

[0029] The motor housing, made of A356-T6 aluminum alloy, ensures both excellent structural strength and lightweight design of the magnetic levitation motor assembly. Furthermore, the aluminum alloy housing exhibits good compatibility with fluorinated refrigerants and possesses high thermal conductivity, accelerating the transfer of internal heat to the external environment.

[0030] In this embodiment of the invention, the interference fit is 0.117 mm to 0.223 mm.

[0031] The motor housing is heated to expand its inner diameter, allowing the motor stator to be rapidly heat-fitted into the stator mounting cavity until one end face of the stator is tightly against the annular axial limiting step, achieving an interference fit between the motor housing and the stator. This appropriate interference fit ensures a tight seal between the motor housing and stator, eliminating air gaps and reducing thermal resistance at the heat transfer interface. Heat generated by the stator's operation can rapidly diffuse along the circumference of the motor housing, resulting in a uniform temperature distribution and preventing localized overheating. Furthermore, the interference fit improves the structural rigidity and strength of the magnetic levitation motor assembly, reducing operating noise and vibration of the magnetic levitation centrifugal compressor, suppressing stator deformation, and enhancing operational stability.

[0032] In this embodiment of the invention, the cross-section of the spiral cooling channel is approximately semi-elliptical.

[0033] In this embodiment of the invention, flanges are provided at both outer ends of the motor housing to connect the two-stage pneumatic components.

[0034] In this embodiment of the utility model, the two threaded coolant interfaces are integrally cast and precision machined with the motor housing.

[0035] Fluorine-containing liquid refrigerant is introduced through the coolant inlet, flowing through a spiral cooling channel to cool the motor stator, and transferring heat to the external environment through the high thermal conductivity aluminum alloy motor housing. The refrigerant in the spiral cooling channel is a two-phase system: the liquid refrigerant flows out to the external pipeline through the coolant outlet; the gaseous refrigerant diffuses into the inner cavity of the motor housing, cooling the motor rotor and magnetic levitation bearing module. This spiral cooling channel structure is simple, simultaneously cooling two heat sources: the motor stator and the magnetic levitation system, simplifying the cooling system. Furthermore, the threaded coolant interface is directly integrated into the motor housing, providing a more reliable seal, easier connection, and lower risk of leakage compared to traditional flange connections.

[0036] In this embodiment of the invention, the mounting position of the magnetic levitation bearing module and the inner cavity of the motor housing are machined in a single clamping operation.

[0037] The bearing mounting position of the magnetic levitation bearing module and the inner cavity of the motor stator are machined in one go on the same high-precision machine tool, achieving extremely high coaxiality. The motor stator, motor rotor, and magnetic levitation bearing module are installed based on this, ensuring the uniformity of the electromagnetic air gap and bearing air gap, and improving the operational stability and performance of the magnetic levitation centrifugal compressor.

[0038] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A magnetic levitation motor assembly, characterized in that: It includes a motor housing, a motor stator pressed into the motor housing, a motor rotor, and magnetic levitation bearing modules installed at both ends of the motor housing; The inner cavity of the motor housing is provided with an inwardly protruding annular axial limiting step at one end; The motor housing is heat-fitted into the motor stator mounting cavity in the motor housing by an interference fit, and one end face of the motor stator abuts against the annular axial limiting step. The inner cavity of the motor housing is integrated with a spiral cooling channel; The magnetic levitation bearing module is installed in the bearing mounting position in the motor housing, and the motor rotor is suspended and supported by the magnetic levitation bearing module.

2. The magnetic levitation motor assembly according to claim 1, characterized in that: The motor housing is cylindrical in shape.

3. The magnetic levitation motor assembly according to claim 1, characterized in that: The spiral cooling channel is connected to threaded coolant interfaces at both ends. One threaded coolant interface is a coolant inlet, and the other threaded coolant interface is a coolant outlet. The two threaded coolant interfaces are located on the outer wall of the motor housing near the base.

4. The magnetic levitation motor assembly according to claim 1, characterized in that: The motor housing is made of A356-T6 aluminum alloy.

5. The magnetic levitation motor assembly according to claim 1, characterized in that: The interference amount of the interference fit is 0.117 mm to 0.223 mm.

6. The magnetic levitation motor assembly according to claim 1, characterized in that: The cross-section of the spiral cooling channel is approximately semi-elliptical.

7. The magnetic levitation motor assembly according to claim 1, characterized in that: Flanges are provided at both outer ends of the motor housing.

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