Medium-high speed magnetic suspension double-winding synchronous generator

Abstract

This application belongs to the field of synchronous generator technology, specifically disclosing a medium-to-high-speed magnetically levitated dual-winding synchronous generator, including: a stator, a rotor, and magnetically levitated bearings; the stator includes AC windings and DC windings; the rotor includes a shaft, a rotor core, a retaining ring, a center ring, and a retaining ring; the center ring is located inside the retaining ring, the retaining ring and the rotor core end are interference-fitted, and the retaining ring and the center ring are interference-fitted; the center ring and the shaft are clearance-fitted; the retaining ring and the shaft are interference-fitted, used for axial limiting of the center ring; the magnetically levitated bearings are used to achieve rotor levitation and control the axial and radial displacement of the rotor, including one set of axial magnetic bearings and two sets of radial magnetic bearings, the axial magnetic bearings are arranged at the non-extended end, and the two sets of radial magnetic bearings are respectively arranged at the extended end and the non-extended end. The magnetically levitated dual-winding synchronous generator provided by this application simultaneously meets the comprehensive requirements of high power density, low vibration and noise, high efficiency, high reliability, and simultaneous AC and DC output.

Description

Technical Field

[0001] This application belongs to the field of synchronous generator technology, and more specifically, relates to a medium- and high-speed magnetic levitation dual-winding synchronous generator. Background Technology

[0002] In some cases, existing independent power systems require generators to provide both AC and DC power simultaneously. However, traditional dual-winding generator sets use a high-speed prime mover connected to a medium- or low-speed synchronous generator via a reduction gearbox. This results in a low overall power density of the unit and significant vibration and noise due to the gearbox. Furthermore, synchronous generators often use mechanical bearings, leading to high mechanical friction losses and the need for complex lubrication systems.

[0003] Increasing generator speed can directly increase generator power density. By directly connecting a medium- or high-speed generator to the prime mover, system equipment can be simplified, system efficiency and power density can be improved, and vibration and noise of the unit can be significantly reduced. At the same time, the use of magnetic levitation bearing technology in the rotor can further suppress or even eliminate low-frequency line spectrum vibration and improve generator operation stability. Therefore, it is necessary to design a medium- or high-speed direct-coupled magnetic levitation dual-winding synchronous generator that can meet the requirements of high power density, low vibration and noise, high efficiency and high reliability that are particularly important in the field of independent power systems. The design of the stator dual-winding end windings, the overall rotor structure design, ventilation and heat dissipation, and the matching design with magnetic levitation bearings have become key factors in motor design. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this application is to provide a medium-to-high speed magnetic levitation dual-winding synchronous generator. This aims to solve the problems of traditional dual-winding generator sets, which use a high-speed prime mover and a medium-to-low speed synchronous generator connected through a reduction gearbox, resulting in low overall power density and high vibration and noise caused by the gearbox. In addition, synchronous generators often use mechanical bearings, which result in high mechanical friction losses and the need for a complex lubrication system.

[0005] The first aspect of this application relates to a medium-to-high speed magnetic levitation dual-winding synchronous generator, comprising: a stator, a rotor, and magnetic levitation bearings; The stator includes AC windings and DC windings; The rotor is located inside the stator and includes a shaft, rotor core, retaining ring, center ring, and retaining ring. The center ring is located inside the retaining ring and has an interference fit with the end of the rotor core. The retaining ring also has an interference fit with the center ring. The center ring has a clearance fit with the shaft. The retaining ring has an interference fit with the shaft and is used to axially limit the center ring. Magnetic levitation bearings are used to levitate the rotor and control its axial and radial displacements. They consist of one set of axial magnetic bearings and two sets of radial magnetic bearings. The axial magnetic bearings are located at the non-extended end, and the two sets of radial magnetic bearings are located at the extended end and the non-extended end, respectively.

[0006] In some implementations, the ends of the AC and DC windings of the stator adopt a hybrid structure of involute and tower-shaped coils.

[0007] In some embodiments, the retaining ring has multiple ventilation holes along the axial direction. The ventilation holes include circular holes and oblong holes. The oblong holes are asymmetrically and unevenly distributed on the retaining ring to match the distance between the end groups of the rotor's excitation windings.

[0008] In some embodiments, the outer circular teeth of the rotor core are provided with multiple circular holes for mounting damping bars, and the ends of the damping bars are welded and fixed to the core. The inner circle of the rotor core has fan-shaped ventilation holes, and the space formed between the holes and the central ring constitutes a through internal cooling circuit.

[0009] In some implementations, the rotor core has two different depths of slots: the shallower slots are used to arrange the Q-axis stabilizing windings, and the deeper slots are used to arrange the excitation windings.

[0010] In some implementations, the excitation windings are arranged in pairs at the ends of the rotor core, with the distance between the end groups being greater than the distance between the excitation windings within the group, and the distance between the end groups increasing gradually to enhance end heat dissipation.

[0011] In some embodiments, the rotor also includes a shaft-driven fan mounted on the shaft. The central ring has a spoke-type structure, with the spokes of the central ring having a trapezoidal cross-section that is wider on the inside and narrower on the outside. The extension direction of the spokes is consistent with the airflow direction of the shaft-driven fan. A dynamic balancing groove is also provided on the central ring.

[0012] In some embodiments, the medium- and high-speed magnetic levitation dual-winding synchronous generator further includes an exciter stator, an exciter rotor, and a rectifier. The exciter rotor is connected to the shaft and rotates with the shaft. The exciter rotor and the exciter stator are located on the non-extended end side in the axial direction. The rectifier is used to rectify the AC power generated by the exciter rotor into DC power and supply it to the excitation winding of the rotor.

[0013] In some implementations, the rotor core is a solid forging or a laminated rotor structure.

[0014] Overall, the technical solutions conceived in this application have the following beneficial effects compared with the prior art: High degree of unity between mechanical and heat dissipation performance: By adopting graded fit of interference and clearance in the rotor end components, the contradiction between fastening and thermal stress release under high-speed rotation is resolved; through the three-layer air path design of the retaining ring irregular hole, the central ring air guide structure and the rotor inner circle ventilation hole, a systematic heat dissipation solution from the inside of the rotor to the end is formed, which significantly reduces the rotor temperature rise and ensures efficient heat dissipation under high power density.

[0015] Optimized matching of electrical performance and structural layout: The hybrid molding design of involute and tower-shaped coils at the stator ends provides a physical basis for the compact arrangement of dual winding ends; the damping bars on the rotor combined with the active control of the magnetic levitation bearings jointly enhance the generator's ability to withstand asymmetrical loads and disturbances, thereby improving the stability of the power grid.

[0016] Dual improvement in low vibration and noise and reliability: Magnetic levitation technology enables non-contact rotor support and eliminates the need for a lubrication system. Combined with the active control of the magnetic levitation bearing, it suppresses the vibration spectrum, resulting in lower overall vibration and noise, more stable and reliable operation, and adaptability to the harsh environment and operating conditions of marine generators, such as high temperature and humidity, impact vibration, and long-term maintenance-free operation. Attached Figure Description

[0017] Figure 1 This is a partial sectional view of the generator provided in an embodiment of this application.

[0018] Figure 2 This is a schematic diagram of the generator stator winding structure provided in the embodiments of this application.

[0019] Figure 3(a) is a schematic diagram of the rotor structure provided in an embodiment of this application.

[0020] Figure 3(b) is a partial schematic diagram of the connection parts such as the retaining ring, the central ring, and the retaining ring provided in the embodiment of this application.

[0021] Figure 4 This is a partial schematic diagram of the retaining ring provided in an embodiment of this application.

[0022] Figure 5 This is a half-sectional view of the generator rotor provided in an embodiment of this application.

[0023] Figure 6 This is a schematic diagram of the generator rotor winding structure provided in an embodiment of this application.

[0024] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein: 1 is the axial magnetic bearing; 2 is the radial magnetic bearing; 3 is the exciter stator; 4 is the stator; 5 is the rotor; 6 is the housing; 7 is the rectifier; 5.1 is the shaft; 5.2 is the extended radial magnetic bearing; 5.3 is the shaft-driven fan; 5.4 is the retaining ring; 5.5 is the center ring; 5.6 is the rotor winding; 5.7 is the rotor core; 5.8 is the retaining ring; 5.9 is the exciter rotor; 5.10 is the non-extended radial magnetic bearing; 5.11 is the thrust disc; 5.12 is the circular hole; 5.13 is the fan-shaped ventilation hole; 5.14 is the Q-axis stabilizing winding; 5.15 is the excitation winding. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0026] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. In this application, the symbol " / " indicates that the related objects are in an "or" relationship, for example, A / B means A or B.

[0027] In this application, the terms “first” and “second” are used to distinguish different objects, rather than to describe a specific order of objects.

[0028] In this application, the term "electrical connection" can refer to a direct circuit connection or a signal transmission via a communication protocol.

[0029] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0030] In the description of the embodiments in this application, unless otherwise stated, "multiple" means two or more.

[0031] The embodiments of this application are described below with reference to the accompanying drawings.

[0032] This application provides a medium-to-high speed magnetic levitation dual-winding synchronous generator, including a stator, a rotor, and magnetic levitation bearings. To simultaneously meet the requirements of AC power frequency, DC output, and high speed, the stator adopts a one-pole dual-winding structure, and the rotor adopts a solid forging or a laminated rotor structure with retaining rings and a center ring. The magnetic levitation bearings are purely electrically excited bearings, including one set of axial magnetic bearings and two sets of radial magnetic bearings. The axial magnetic bearings are arranged at the non-extended end of the generator, and the two sets of radial magnetic bearings are arranged at the extended end and non-extended end of the generator, respectively.

[0033] The stator end windings include DC windings and AC windings, both of which adopt involute and tower-shaped coils. Through a hybrid molding structure design, the end dimensions of the two sets of windings can be effectively controlled and the inductance parameters can be matched. The rotor adopts a solid rotor or laminated rotor structure, with a center ring and retaining ring at both ends of the generator rotor. The center ring and retaining ring are installed with an interference fit, the retaining ring and rotor end are installed with an interference fit, and the center ring and shaft are installed with a clearance fit. The center ring is axially limited by a retaining ring, and the retaining ring and shaft are installed with an interference fit. The center ring has a spoke structure, with the spokes having a trapezoidal structure for airflow guidance (wider inside and narrower outside), and the spokes are aligned with the airflow direction of the shaft-driven fan. Dynamic balancing grooves are provided on the center ring.

[0034] The rotor retainer ring has multiple circular and oblong combined ventilation holes along the axial direction for heat dissipation of the end windings. The oblong ventilation holes are distributed asymmetrically and unevenly on the retainer ring. The diameter, density, and distribution position of the ventilation holes are determined according to the structure of the end windings, heat distribution, and airflow field.

[0035] The rotor employs either a solid forged rotor or a laminated rotor structure. If a laminated structure is used, evenly distributed circular holes are formed on the outer teeth of the rotor for mounting damping bars. The ends of the damping bars are welded to the rotor core. Symmetrically distributed fan-shaped ventilation holes are formed on the inner circumference of the rotor. The rotor has two different depths of slots, one for accommodating the Q-axis stabilizing winding and the other for accommodating the excitation winding. The excitation windings are arranged in pairs, with increased distance between the end pairs to enhance end heat dissipation.

[0036] Example This application provides a medium-to-high-speed magnetic levitation dual-winding synchronous generator, designed to meet the specific requirements of a particular independent power system for a generator with medium-to-high-speed direct connection, high power density, low vibration and noise, and simultaneous AC / DC output; its overall structure is as follows: Figure 1 As shown, it includes an exciter stator 3, a stator 4, a rotor 5, a magnetic levitation bearing, a housing 6, and a rectifier 7; the magnetic levitation bearing includes an axial magnetic bearing 1 and a radial magnetic bearing 2; the radial magnetic bearing 2 includes an extended radial magnetic bearing 5.2 and a non-extended radial magnetic bearing 5.10; like Figure 2As shown, the stator 4 is a stationary component. The stator is cylindrical and surrounds the outside of the rotor 5. The stator has slots inside for arranging AC windings and DC windings. Stator 4 adopts a dual-winding structure, including a DC winding and an AC winding. The ends of the two windings adopt a hybrid structure of involute and tower-shaped coils. This structure not only effectively controls the end dimensions of the two sets of windings and avoids mechanical interference, but also takes into account the precise matching of inductance parameters, enabling the generator to output high-quality AC and DC power at the same time, which significantly improves the integration of the generator. Rotor 5, as a rotating component, is located at the center of the generator and is surrounded by the stator from the outside. The rotor is supported without contact by magnetic levitation bearings. The magnetic levitation bearing adopts a purely electrically excited bearing, including one set of axial magnetic bearing 1 and two sets of radial magnetic bearing 2. The axial magnetic bearing 1 is arranged at the non-extended end of the generator to control the axial displacement of the rotor. The two sets of radial magnetic bearings are arranged at the extended end and non-extended end of the generator, respectively, to control the radial displacement of the rotor. This fully electrically suspended support method completely replaces the traditional mechanical bearing and complex lubrication system, fundamentally eliminating mechanical friction loss. It also effectively suppresses the low-frequency line spectrum vibration of the rotor through active control, and greatly improves the operating stability of the generator over a wide speed range.

[0037] The rectifier 7 is used to rectify the AC power generated by the exciter rotor 5.9 into DC power and supply it to the excitation winding 5.15 of the generator rotor.

[0038] The entire structure is enclosed by the casing 6, forming a complete generator unit.

[0039] As shown in Figures 3(a) and 3(b), the internal components of the rotor structure are arranged along the shaft 5.1. With the shaft 5.1 as the center, the components from the extended end to the non-extended end are, in sequence, the extended end radial magnetic bearing 5.2, the shaft-driven fan 5.3, the retaining ring 5.4, the center ring 5.5, the rotor winding 5.6 and the rotor core 5.7, the retaining ring 5.8, the exciter rotor 5.9, the non-extended end radial magnetic bearing 5.10, and the thrust disk 5.11. The rotating shaft 5.1 serves as the central frame of the rotor, bearing and transmitting the mechanical loads of all rotating parts, while simultaneously transferring the mechanical energy of the prime mover into the generator. The rotor core 5.7 serves as the main magnetic circuit component of the rotor, providing a magnetic resistance path for the excitation flux. It can be in the form of a solid forging or a laminated structure. The exciter rotor 5.9 and the exciter stator 3 work together to form the rotating rectifier part of the brushless excitation system. Excitation current is generated on the rotating side through electromagnetic induction. After being rectified by the rectifier 7, it is supplied to the excitation winding of the main generator rotor, realizing contactless excitation, eliminating the need for traditional slip rings and brushes, and improving system reliability.

[0040] The thrust plate 5.11 is installed at the end of the shaft and cooperates with the axial magnetic bearing 1. It serves as the force-bearing surface of the axial magnetic bearing 1 and receives the action of axial magnetic force, thereby realizing active control of the rotor's axial displacement and suspension support.

[0041] The rotor end fixing adopts an outer tight, inner loose design to balance high-speed centrifugal force and thermal expansion stress. The retaining ring 5.8, as the outermost clamping component, has an interference fit between its inner extended end and the end of the rotor core 5.7, ensuring reliable clamping of the internal rotor winding 5.6 under enormous centrifugal force and preventing displacement or loosening during high-speed rotation. The center ring is located inside the retaining ring, and its outer side has an interference fit with the inner non-extended end of the retaining ring 5.8, together forming a robust end structure. The center ring 5.5 and the shaft 5.1 have a clearance fit, allowing the center ring to expand freely during hot operation and avoiding excessive thermal stress. The retaining ring 5.4 and the shaft 5.1 have an interference fit, ensuring structural integrity at high speeds and solving the thermal stress problem. In summary, this "outer tight, inner loose" graded fit design avoids the huge contact stress directly between the retaining ring 5.8 and the shaft, ensuring structural integrity at high speeds, allowing free expansion of components during hot operation, reducing thermal stress concentration, and significantly simplifying the assembly process.

[0042] The central ring 5.5 is designed with a spoke-type structure, where the spokes are trapezoidal air-guiding structures that are wider on the inside and narrower on the outside, and their direction is consistent with the airflow direction of the shaft-driven fan 5.3. Combined with the space created by the clearance fit between the central ring and the rotating shaft, the cooling airflow is efficiently guided into the rotor. The shaft-driven fan 5.3 is mounted on the rotating shaft and rotates synchronously with the rotor, driving the cooling airflow to circulate within the generator, providing the airflow power source for the entire rotor cooling system. Furthermore, such as... Figure 4 As shown, the retaining ring 5.8 does not simply have a round hole, but has a combination of round and waist-shaped ventilation holes along the axial direction, which are optimized based on the rotor end winding structure, heat distribution and airflow field simulation. The waist-shaped holes are distributed in an asymmetrical and non-uniform structure, which can accurately guide the cooling gas to impact the high-temperature area at the end of the winding.

[0043] like Figure 5 and Figure 6 As shown; the rotor core 5.7 integrates electrical, heat dissipation, and damping functions, and its specific structure is as follows: The rotor core has two different depths of slots. The shallower slots house the Q-axis stabilizing winding 5.14, while the deeper slots house the excitation winding. The excitation windings are arranged in pairs at the ends, with the distance between the pairs increased to increase the heat dissipation area.

[0044] The ventilation holes on the rotor core include fan-shaped ventilation holes 5.13 and circular holes 5.12; the fan-shaped ventilation holes 5.13 are symmetrically distributed on the inner circle of the rotor core and cooperate with the air duct of the central ring 5.5 to form a through internal cooling circuit; the circular holes 5.12 are evenly distributed on the outer circle teeth of the rotor core and are used to install damping bars. The ends of the damping bars are welded and fixed to the core to form a damping system; dynamic balance grooves are provided on the central ring 5.5.

[0045] like Figure 5 and Figure 6 As shown, the generator rotor core 5.7 adopts a solid forging or high-strength laminated structure. When using a laminated structure, damping strips 5.12 are installed and welded to the outer teeth of the rotor to form a reliable damping system, effectively suppressing voltage harmonics and negative sequence current impacts. The symmetrically opened fan-shaped ventilation holes 5.13 on the inner circle of the rotor cooperate with the central ring air duct to form a through internal cooling circuit. Two types of slots of different depths are opened on the rotor core, which are used to arrange the Q-axis stabilizing winding 5.14 and the excitation winding 5.15, respectively. The excitation winding 5.15 is used to pass DC excitation current to establish the main magnetic field in the air gap, which is the core winding for the generator to realize electromechanical energy conversion. The excitation windings are grouped in pairs, and the distance between the end groups is increased, which significantly increases the heat dissipation surface area and further reduces the end temperature rise. The Q-axis stabilizing winding 5.14 is arranged in the shallow slots of the rotor core, working in conjunction with the damping bars to suppress the oscillations generated by the generator when subjected to asymmetrical loads and external disturbances, thereby improving the generator's dynamic stability and grid support capability.

[0046] The aforementioned structural features are not simply superimposed, but rather work synergistically to solve existing technical challenges: High degree of unity between mechanical and heat dissipation performance: By adopting graded fit of interference and clearance in the rotor end components, the contradiction between fastening and thermal stress release under high-speed rotation is resolved; through the three-layer air path design of the retaining ring irregular hole, the central ring air guide structure and the rotor inner circle ventilation hole, a systematic heat dissipation solution from the inside of the rotor to the end is formed, which significantly reduces the rotor temperature rise and ensures efficient heat dissipation under high power density.

[0047] Optimized matching of electrical performance and structural layout: The hybrid molding design of involute and tower-shaped coils at the stator ends provides a physical basis for the compact arrangement of dual winding ends; the damping bars on the rotor combined with the active control of the magnetic levitation bearings jointly enhance the generator's ability to withstand asymmetrical loads and disturbances, thereby improving the stability of the power grid.

[0048] Dual improvement in low vibration and noise and reliability: Magnetic levitation technology enables non-contact rotor support and eliminates the need for a lubrication system. Combined with the active control of the magnetic levitation bearing, it suppresses the vibration spectrum, resulting in lower overall vibration and noise, more stable and reliable operation, and fully adapting to the harsh environment and operating conditions of marine generators, such as high temperature and humidity, impact vibration, and long-term maintenance-free operation.

[0049] It should be understood that expressions such as “comprising” and “may include” used in this application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In this application, terms such as “comprising” and / or “having” are to be interpreted as indicating a particular characteristic, number, operation, constituent element, component, or combination thereof, but not to exclude the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.

[0050] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. "Fixed connection" refers to a connection where the relative positional relationship remains unchanged after connection. "Rotary connection" refers to a connection where the components can rotate relative to each other after connection. "Sliding connection" refers to a connection where the components can slide relative to each other after connection. The directional terms mentioned in the embodiments of this application, such as "top," "bottom," "inner," "outer," "left," and "right," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this application, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0051] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A medium-to-high-speed magnetic levitation dual-winding synchronous generator, characterized in that, include: Stator, rotor, magnetic bearing, exciter stator, exciter rotor, and rectifier; The stator includes AC windings and DC windings; The rotor is located inside the stator and includes a shaft, rotor core, retaining ring, center ring, and retaining ring. The center ring is located inside the retaining ring and has an interference fit with the end of the rotor core. The retaining ring also has an interference fit with the center ring. The center ring has a clearance fit with the shaft. The retaining ring has an interference fit with the shaft and is used to axially limit the center ring. Magnetic levitation bearings are used to levitate the rotor and control its axial and radial displacements. They consist of one set of axial magnetic bearings and two sets of radial magnetic bearings. The axial magnetic bearings are located at the non-extended end, and the two sets of radial magnetic bearings are located at the extended end and the non-extended end, respectively. The exciter rotor is connected to the shaft and rotates with the shaft; the exciter rotor and the exciter stator are located on the non-extended end side in the axial direction; the rectifier is used to rectify the AC power generated by the exciter rotor into DC power and supply it to the excitation winding of the rotor; The ends of the AC and DC windings of the stator adopt a hybrid structure of involute and tower-shaped coils.

2. The medium-high speed magnetic levitation dual-winding synchronous generator according to claim 1, characterized in that, The outer circular teeth of the rotor core have multiple circular holes for installing damping bars, and the ends of the damping bars are welded and fixed to the core. The inner circle of the rotor core has fan-shaped ventilation holes, and the space formed between the holes and the central ring constitutes a through internal cooling circuit.

3. The medium-high speed magnetic levitation dual-winding synchronous generator according to claim 1, characterized in that, The rotor core has two different depths of slots. The shallower slots are used to arrange the Q-axis stabilizing winding, while the deeper slots are used to arrange the excitation winding.

4. The medium-high speed magnetic levitation dual-winding synchronous generator according to claim 3, characterized in that, The excitation windings are arranged in pairs at the ends of the rotor core. The distance between the end groups is greater than the distance between the excitation windings within the group, and the distance between the end groups increases gradually to enhance heat dissipation at the ends.

5. The medium-high speed magnetic levitation dual-winding synchronous generator according to claim 1, characterized in that, The rotor also includes a shaft-driven fan mounted on the shaft. The central ring has a spoke-type structure, with the spokes of the central ring having a trapezoidal cross-section that is wider on the inside and narrower on the outside. The extension direction of the spokes is consistent with the airflow direction of the shaft-driven fan. A dynamic balancing groove is also provided on the central ring.

6. The medium-high speed magnetic levitation dual-winding synchronous generator according to claim 1, characterized in that, The rotor core is made of solid forgings or laminated rotor structure.

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