A permanent magnet shaft-belt generator

Abstract

The utility model provides a permanent magnet shaft-belt generator, which mainly includes a stator and a shaftless rotor, wherein the stator mainly includes a stator core and a winding; the shaftless rotor mainly includes a rotor core, a magnetic steel and a rotor support, wherein the stator core is composed of a plurality of stator tooth core modules connected end to end, and a stator tooth winding is wound on the stator tooth core module; the rotor core is composed of a plurality of rotor core modules connected end to end, and each rotor core module is equipped with a magnetic steel, and the rotor support is a petal structure, and the rotor core is mounted on the outer circumferential surface of the rotor support. The utility model makes each tooth of the stator core into a separate stator tooth core module, and winds a stator tooth winding on each stator tooth core module; and the rotor core is also made into a modular structure in which each tooth portion is a rotor core module, which provides convenience for completing the assembly, disassembly and hoisting of the generator in a narrow space.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a permanent magnet shaft-belt generator. Background Art

[0002] The shaft generator is a generator driven by the ship's main engine. In the early 1970s, it developed rapidly under the influence of the Middle East oil crisis. The shaft of the shaft generator borrows the main shaft of the ship's engine and is installed between the ship's main engine and the propeller, using the surplus power of the ship's main engine to achieve the purpose of energy conservation and emission reduction. The power of a large shaft generator is often hundreds of kilowatts or even thousands of kilowatts; its weight can reach hundreds of tons, its diameter can reach more than 3 meters, and its length can reach more than 6 meters.

[0003] In order to prevent the ship from malfunctioning during long voyages, most of the key equipment on the ship is equipped with spare parts. As the shaft generator that provides power to the ship, in order to prevent the ship from losing power due to generator failure during long voyages, spare parts should obviously be prepared. However, due to its large size and weight, storing a set of stators (note, motor failure is mainly caused by coil burnout) in the ship's warehouse not only takes up a lot of space, but also the cost of spare parts is too high.

[0004] The shaft generator is installed directly by the shipyard when the ship is manufactured. The engine room is built after the shaft generator is installed. Once a problem occurs during operation, it is extremely difficult to repair due to the limited space on the ship. Moreover, its lifting and installation cannot be carried out without leaving the dock, which brings huge difficulties to maintenance.

[0005] In addition, during the reconstruction of old ships, even in the dock, due to the limitation of the hull space, installing such a large generator on the main shaft between the ship engine and the propeller often requires cutting open the roof of the engine room to solve the problem of hoisting the generator into the engine room, which not only damages the structure of the hull, but also is time-consuming and labor-intensive.

[0006] Furthermore, ocean-going vessels usually spend a long time at sea. If a fault occurs, the industry stipulates that it needs to be removed within three hours to avoid adding additional load to the main engine. From the above description, it can be seen that it is difficult to completely remove such a large shaft belt generator within three hours.

[0007] The Chinese utility model patent application document "A half-split permanent magnet shaft-mounted generator and its assembly method" with application publication number CN117134568A can solve the above-mentioned technical problems to a certain extent by making the stator and rotor into two halves, but there are still certain defects, mainly two points: 1. Due to the excessive weight of large shaft-belt generators, even if the stator is divided into two halves, it is only convenient to install the stator and rotor on the main shaft of the ship engine from both sides during maintenance or modification, and lifting is still a problem; 2. Its winding is distributed, and the span of the winding is greater than 1. There must be empty slots when the two stators are divided into two halves, which will sacrifice some performance parameters of the generator, such as efficiency, noise, vibration, etc. Utility Model Content

[0008] In view of this, the utility model provides a permanent magnet shaft-belt generator with a modular design in which the stator, rotor core and end cover can be detached.

[0009] To this end, the present application provides the following technical solutions: a permanent magnet shaft-belt generator, mainly comprising a stator and a shaftless rotor, wherein the stator mainly comprises a stator core and a winding; the shaftless rotor mainly comprises a rotor core, a magnetic steel and a rotor bracket, the stator core is composed of a plurality of stator tooth core modules connected end to end, the number of the stator tooth core modules is equal to the number of teeth of the generator, the stator tooth core module is wound with a stator tooth winding, the stator tooth core module and the stator tooth winding together constitute a stator tooth core module with windings; a plurality of the stator tooth core modules with windings The stator core is connected to form a semicircular winding stator core, and two semicircular stator cores constitute a stator core; the rotor core is composed of a plurality of rotor core modules connected end to end, each of the rotor core modules is equipped with magnetic steel, and a plurality of the rotor core modules are connected to form a semicircular rotor core, and two semicircular rotor cores constitute a rotor core; the rotor bracket is a split-petal structure, the rotor core is mounted on the outer circumference of the rotor bracket, and the rotor bracket is fastened to the outer circumference of the main shaft of the ship engine.

[0010] Furthermore, the multiple stator tooth windings in the stator core with windings are connected in series or in parallel to form a split stator winding, and the two split stator windings are connected in series or in parallel to form a winding of a generator; one or more sets of stators and shaftless rotors are added to one end of the stator and shaftless rotor, and multiple sets of stators are connected in parallel to form a new generator with increased power.

[0011] Furthermore, the rotor bracket is tension-connected to the main shaft of the ship engine via a split tension sleeve.

[0012] Furthermore, the stator also includes a casing, which is composed of two semicircular casing petals connected together, and flange petals are provided on both sides of each casing petal; the generator also includes two end covers, and the end covers are connected to the casing through flanges.

[0013] Furthermore, the stator tooth core module is divided into three types, namely the first stator tooth core module, the second stator tooth core module and the third stator tooth core module; the first stator tooth core module is respectively provided with a first protruding buckle protruding outward and a first recessed groove on the left and right sides along the circumferential direction of the yoke, and the adjacent first protrusions and first grooves are engaged with each other after being plugged in, the second stator tooth core module is provided with a first groove on one side of the yoke, and the third stator tooth core module is provided with a first protrusion on one side of the yoke; a plurality of the first stator tooth core modules, a second stator tooth core module and a third stator tooth core module are connected end to end to form a semicircular stator core petal, and the two stator core petals are connected to form a stator core.

[0014] Furthermore, the rotor core modules are divided into three types, namely, a first rotor tooth core module, a second rotor tooth core module and a third rotor tooth core module; the first rotor tooth core module is respectively provided with a second protruding buckle protruding outward and a second recessed groove protruding inward on the left and right sides along the circumferential direction of the yoke, and the adjacent second protrusions and second grooves are engaged with each other after being plugged in, and a second groove is provided on one side of the yoke of the second rotor tooth core module; a second protrusion is provided on one side of the yoke of the third rotor tooth core module; a plurality of the first rotor tooth core modules, a second rotor tooth core module and a third rotor tooth core module are connected end to end to form a semicircular rotor core petal, and two of the rotor core petals are connected to form a rotor core.

[0015] Furthermore, rotor blades capable of preventing the magnetic steel from axially moving are installed on the left and right sides of the rotor core, and the rotor blades are composed of a plurality of rotor blade modules connected end to end.

[0016] Furthermore, the rotor blade module is made of non-magnetic material.

[0017] Furthermore, a positioning groove with a semicircular cross section is provided at the joint between the shell petals, and a circular positioning hole is formed after the two positioning grooves are joined, and a positioning pin is clamped at the positioning hole.

[0018] Furthermore, the end cover is formed by butting two end cover petals together.

[0019] The beneficial effects of the utility model are as follows: the utility model manufactures the stator core into a stator tooth core module unit for each pole and each phase (each tooth), and winds the stator tooth winding on each stator tooth core module; and manufactures the rotor core into a modular structure in which each tooth portion (pole) is a rotor core module, thereby facilitating the assembly, disassembly and hoisting of the generator in a narrow space, and also greatly reducing the inventory pressure of spare parts; in addition, the modular design of the stator tooth core enables the generator winding to only need to replace the corresponding module when a fault occurs, without having to replace the entire stator winding, thereby greatly saving maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is a structural schematic diagram of the utility model.

[0022] Figure 2 yes Figure 1 Assembly exploded diagram.

[0023] Figure 3 yes Figure 2 Schematic diagram of the structure of the stator.

[0024] Figure 4 It is a structural schematic diagram of the first stator tooth core module.

[0025] Figure 5 Schematic diagram of the structure of the second stator tooth core module.

[0026] Figure 6 It is a structural schematic diagram of the third stator tooth core module.

[0027] Figure 7 This is a connection diagram of the stator tooth core module.

[0028] Figure 8 yes Figure 7 main view.

[0029] Fig. 9 yes Figure 2 Exploded view of the shaftless rotor assembly.

[0030] Fig.10 It is a structural schematic diagram of the first rotor tooth core module.

[0031] Fig.11Schematic diagram of the structure of the second rotor tooth core module.

[0032] Fig.12 It is a structural schematic diagram of the third rotor tooth core module.

[0033] Fig.13 It is a structural schematic diagram of the rotor blade module.

[0034] Fig.14 This is a schematic diagram of the structure of the generator after capacity expansion.

[0035] In the figure: 1, main shaft; 2, end cover; 3, flange; 4, stator; 5, shaftless rotor; 6, split tension sleeve; 7, positioning pin; 41, housing; 42, stator tooth core module with winding; 42A, first stator tooth core module; 42B, second stator tooth core module; 42C, third stator tooth core module; 51, rotor core; 51A, first rotor tooth core module; 51B, second rotor tooth core module; 51C, third rotor tooth core module; 52, rotor blade; 53, rotor bracket; 411, positioning groove; 421, first convex buckle; 422, first mounting hole; 423, first groove; 424, stator tooth winding; 511, second convex buckle; 512, second mounting hole; 513, second groove; 521, rotor blade module; 5211, thin edge. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0037] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0038] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0039] The utility model discloses a permanent magnet shaft-engaged generator, hereinafter referred to as generator.

[0040] like Figure 1 , 2 The generator shown mainly includes a stator 4, a shaftless rotor 5, and some parts such as an end cover 2, wherein the stator is mainly composed of a stator core, a winding (a stator core wound with a winding is also called a stator core with a winding) and a casing 41; the shaftless rotor mainly includes a rotor core 51, a magnetic steel, a rotor bracket 53, etc., wherein the shaftless rotor is installed on the main shaft 1 of the ship's main engine through the rotor bracket.

[0041] 1. Stator.

[0042] like Figure 3-8 As shown, the stator core is made into a modular type, that is, each pole and each phase (each tooth) is a stator tooth core module, each stator tooth core module includes a yoke part and a tooth part, and the tooth parts of two adjacent stator tooth core modules form stator slots that can accommodate windings, that is to say, the number of stator tooth core modules is equal to the number of teeth of the generator stator teeth (also equal to the number of stator slots). Each stator tooth core module is composed of a plurality of stacked silicon steel sheets, and each stator tooth core module is wound with a centralized stator tooth winding 424. After the stator tooth winding and the stator tooth core module are assembled, it is called a winding stator tooth core module 42; a plurality of winding stator tooth core modules are enclosed to form a complete winding stator core. In order to reduce the difficulty of assembling the winding stator tooth core module and facilitate the docking of the corresponding two winding stator tooth core modules, the stator tooth core module can be made into three structural modes. Specifically, there are: a first stator tooth core module 42A, a second stator tooth core module 42B (two for each generator) and a third stator tooth core module 42C (two for each generator, and the rest are first stator tooth core modules). Figure 4 As shown, the first stator tooth core module is provided with a first protruding buckle 421 protruding outward and a first recessed groove 422 recessed inward on the left and right sides along the circumferential direction of the yoke, respectively. The first protruding buckles and the first recesses of two adjacent first stator tooth core modules are engaged with each other after being plugged in, which can effectively prevent the two adjacent stator tooth core modules from slipping off; Figure 5 As shown, a first groove is provided on one side of the yoke of the second stator tooth core module; Figure 6 As shown, a first convex buckle is provided on one side of the yoke of the third stator tooth core module. The above three stator tooth core modules are provided with two first mounting holes 422 at the axial yoke. If only one type of stator tooth core module is manufactured, i.e., the structural form of the first stator tooth core module, it will be extremely difficult to connect the stator tooth core modules end to end into a full circle, which can be easily associated with the description of the stator core assembly process later.

[0043] A complete winding stator core is composed of two semicircular winding stator core petals, and the specific assembly process is as follows: when a number of winding stator tooth core modules are used to assemble a complete winding stator core, first, the first protrusion of a first stator tooth core module is inserted into the first groove of the second stator tooth core module, and then the first protrusions of the first modules are inserted into the first grooves of the previous first stator tooth core module. When a semicircle is about to be formed, the first protrusion of a third stator tooth core module is inserted into the first groove of the previous first stator tooth core module. At this point, the assembly of a winding stator core petal is completed, and multiple stator tooth windings in the winding stator core petal are connected in series or in parallel to form a petal stator winding; then the second winding stator core petal is assembled in this way. After two stator cores with windings are divided into two parts to form a complete stator core with windings, the two stator windings are connected together in series or in parallel.

[0044] like Figure 3 As shown, the housing is formed by connecting two semicircular housing parts, and semi-circular flange parts with inner stoppers are provided on both sides of the housing parts. The two flange parts and the inner wall of the housing form a semi-circular groove. During assembly, the winding stator core part is embedded in the semi-circular groove, and then screws are passed through the two flange parts and the first mounting holes of the stator tooth core module to fix the winding stator core in the semi-circular groove.

[0045] In order to facilitate the rapid and accurate docking of the two housing petals, a positioning groove 411 with a semicircular cross section is provided at the docking point of the housing petals. After the two positioning grooves are docked, a circular positioning hole is formed. A positioning pin 7 is clamped at the positioning hole. When the two housing petals are tightened with screws, the two housing petals will automatically return to their original position in the radial direction under the action of the positioning pin, thereby achieving perfect docking. After docking, the two flange petals form a circular flange 3 that can dock with the inner and outer stoppers of the end cover.

[0046] The biggest advantage of this type of generator structure over the existing technology is that it can ensure that the connection between the stator tooth windings on each stator core with windings is the same. The number of poles and slots is designed to ensure that the number of parallel branches of the winding is greater than or equal to 2, and the uniform petals can be divided into divisors of the maximum number of parallel branches. In addition, the design uses a centralized stator tooth winding, which divides the stator core into stator tooth core modules according to the number of slots or teeth (number of slots = number of teeth), achieving the purpose of no empty slots, making full use of materials, and ensuring the performance of the generator.

[0047] 2. Shaftless rotor.

[0048] like Figure 2 , 9As shown, the rotor core is also made into a modular type, similar to the structure of the stator core, and is also formed by connecting a number of rotor core modules end to end to form a semicircular rotor core petal, and then two rotor core petals are surrounded to form a complete rotor core. The rotor core module is also composed of a number of silicon steel sheets stacked. Similarly, in order to reduce the difficulty of assembling the rotor core, the rotor core module also includes three types, namely, a number of first rotor tooth core modules 51A (see Fig.10 ), a second rotor tooth core module 51B with a second groove on one side of the two yokes (see Fig.11 ), and a third rotor tooth core module 51C having a second protrusion on one side of the two yokes (see Fig.12 ), the assembly process of the semicircular rotor core segment is the same as that of the stator core segment, which will not be described in detail here. A second mounting hole 511 is provided near the outer circumferential surface of each rotor core module, and a magnetic steel constituting a tooth portion is inserted into the second mounting hole.

[0049] The rotor support includes two semi-circular, frame-type rotor support petals, the inner and outer circumferential surfaces of the rotor support petals are bent into arcs by steel plates, and the two steel plates are welded and connected by a number of supporting square steel plates; after the semi-circular rotor core is assembled, it is attached to the outer circumferential surface of the rotor support petals, and screws are passed through the inner wall of the rotor support petals to fix each rotor core module on the outer circumferential surface of the rotor support petals. After the two semi-circular rotor core petals are connected to the rotor support respectively, they are brought closer to the main shaft from both sides of the main shaft, and then the two rotor support petals are connected with screws, and a complete rotor core is assembled. Then a petal tension sleeve 6 is inserted between the main shaft and the inner wall of the rotor support, and then the petal tension sleeve is adjusted. When the petal tension sleeve is tightened, the rotor support is fixed on the main shaft, and at the same time, it is ensured that the rotor core and the main shaft are concentric.

[0050] Rotor blades 52 are installed on the left and right sides of the rotor core along the axial direction. The main function of the rotor blades is to fix the magnetic steel in the axial direction to prevent its axial movement. In order to facilitate on-site assembly in the ship's engine room, the rotor blades are also made into modular types. Fig. 9 , 13 As shown, the rotor blades are formed by connecting a plurality of rotor blade modules 521 end to end to form a polygonal structure similar to a circle. Thin edges 5211 extending outward in the axial direction are provided on both sides of the rotor blade modules. After the thin edges of two adjacent rotor blade modules are overlapped, they are fixed to the rotor core module with screws. Each rotor core module corresponds to a rotor blade module. To avoid magnetic leakage, the rotor blade module is made of non-magnetic conductive materials, such as aluminum alloy plates.

[0051] 3. End cap.

[0052] like Figure 1 , 2 As shown, the end cover is formed by two end covers with the same structure being butted together. The generator has two end covers, which are connected to the casing through flanges with screws.

[0053] In the upgrade and reconstruction of old ships, a lot of electrical equipment is often added, and the power consumption will increase significantly. Only by increasing the power of the generator can the needs of the upgrade and reconstruction be met. The power of the generator mainly depends on the diameter and length of the stator and rotor. When the diameter of the stator and rotor is constant, increasing the power of the generator can only increase the length of the stator and rotor. The length of the stator and rotor of the existing generator is fixed. When the power consumption increases and the capacity needs to be increased, it can only be solved by replacing a new generator, which brings huge cost pressure to the capacity increase.

[0054] From the above description, it can be known that the winding stator core of the utility model is composed of two winding stator core petals spliced ​​together, each winding stator core petal is connected together by a plurality of winding stator tooth core modules, and the winding is centralized; the rotor core is composed of two rotor core petals spliced ​​together, each rotor core petal is connected together by a plurality of rotor core modules. This modular design is very convenient for disassembly, assembly and axial installation of new modules. For example, when it is necessary to increase the capacity of the generator, as long as the length of the main shaft meets the requirements, the end cover at one end of the generator can be removed, and one or more sets of stators and shaftless rotors can be added to one end of the original stator and shaftless rotor, and the casing can be connected in series with long screws, and finally the axially corresponding stator tooth windings (stators) are connected in parallel according to the design requirements to form a new stator, thereby obtaining a generator with increased power (see Fig.14 ). There may be obstacles such as pipelines on the bottom plate of the ship's engine room. If such working conditions are encountered, one or more new generators can be installed at the appropriate position of the main shaft without destroying the existing structure, and then the corresponding stator tooth windings (stators) are connected in parallel through wires on the outside of the generator according to the design requirements to form a segmented, separately arranged generator. Therefore, the generator of this structure can cope well with the complex working conditions in the ship's engine room. If the power of the original generator is 200KW, by connecting stators of different lengths in parallel and adding a shaftless rotor (or one or more generators of the same power) to the main shaft, the power of the generator can be finally increased to any power such as 300KW, 350KW, 500KW, etc., to meet the needs of increasing the power consumption of the ship. In this way, the original generator can still be used, which greatly saves the cost of upgrading and transformation.

[0055] In addition, when a section of stator tooth winding fails, the existing generator can only replace the stator winding of the entire stator or half of the stator, while the utility model only needs to replace the corresponding stator tooth core module with windings, which can greatly save maintenance costs.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A permanent magnet shaft-belt generator, mainly comprising a stator and a shaftless rotor, wherein the stator mainly comprises a stator core and a winding; the shaftless rotor mainly comprises a rotor core, a magnetic steel and a rotor bracket, characterized in that: The stator core is composed of a plurality of stator tooth core modules connected end to end, the number of the stator tooth core modules is equal to the number of teeth of the generator, the stator tooth core modules are wound with stator tooth windings, and the stator tooth core modules and the stator tooth windings together constitute a stator tooth core module with windings; a plurality of stator tooth core modules with windings are connected to form a semicircular stator core petal with windings, and two semicircular stator core petals with windings constitute a stator core with windings; the rotor core is composed of a plurality of rotor core modules connected end to end, each of the rotor core modules is equipped with magnetic steel, a plurality of rotor core modules are connected to form a semicircular rotor core petal, and two semicircular rotor core petals constitute a rotor core; the rotor bracket is a petal structure, the rotor core is mounted on the outer circumferential surface of the rotor bracket, and the rotor bracket is fastened to the outer circumferential surface of the main shaft of the ship engine.

2. According to claim 1, a permanent magnet shaft-belt generator is characterized in that: The multiple stator tooth windings in the stator core with windings are connected in series or in parallel to form a split stator winding, and the two split stator windings are connected in series or in parallel to form a winding of a generator; one or more sets of stators and shaftless rotors are added to one end of the stator and the shaftless rotor, and multiple sets of stators are connected in parallel to form a new generator with increased power.

3. According to claim 1, a permanent magnet shaft-belt generator is characterized in that: The rotor bracket is tension-connected to the main shaft of the ship engine through a split tension sleeve.

4. The permanent magnet shaft-belt generator according to claim 1, characterized in that: The stator also includes a casing, which is formed by connecting two semicircular casing petals, and flange petals are provided on both sides of each casing petal; the generator also includes two end covers, which are connected to the casing through flanges.

5. The permanent magnet shaft-mounted generator according to claim 1, characterized in that: The stator tooth core modules are divided into three types, namely the first stator tooth core module, the second stator tooth core module and the third stator tooth core module; the first stator tooth core module is provided with a first protruding buckle protruding outward and a first recessed groove respectively on the left and right sides along the circumferential direction of the yoke, and the adjacent first protrusions and first grooves are engaged with each other after being plugged in, the second stator tooth core module is provided with a first groove on one side of the yoke, and the third stator tooth core module is provided with a first protruding buckle on one side of the yoke; a plurality of the first stator tooth core modules, a second stator tooth core module and a third stator tooth core module are connected end to end to form a semicircular stator core petal, and two of the stator core petals are connected to form a stator core.

6. The permanent magnet shaft-mounted generator according to claim 1, characterized in that: The rotor core modules are divided into three types, namely the first rotor tooth core module, the second rotor tooth core module and the third rotor tooth core module; the first rotor tooth core module is respectively provided with a second protruding buckle protruding outward and a second recessed groove on the left and right sides along the circumferential direction of the yoke, and the adjacent second protrusions and second grooves are engaged with each other after being plugged in, and a second groove is provided on one side of the yoke of the second rotor tooth core module; a second protrusion is provided on one side of the yoke of the third rotor tooth core module; a plurality of the first rotor tooth core modules, a second rotor tooth core module and a third rotor tooth core module are connected end to end to form a semicircular rotor core petal, and two of the rotor core petals are connected to form a rotor core.

7. The permanent magnet shaft-mounted generator according to claim 1, characterized in that: The left and right sides of the rotor core are provided with rotor blades which can prevent the axial movement of the magnetic steel. The rotor blades are composed of a plurality of rotor blade modules which are connected to each other end to end.

8. A permanent magnet shaft-belt generator according to claim 7, characterized in that: The rotor fan blade module is made of non-magnetic conductive material.

9. The permanent magnet shaft-engaged generator according to claim 4, characterized in that: A positioning groove with a semicircular cross section is arranged at the joint between the shell petals, and a circular positioning hole is formed after the two positioning grooves are joined, and a positioning pin is clamped at the positioning hole.

10. The permanent magnet shaft-mounted generator according to claim 4, characterized in that: The end cover is formed by butting two end cover petals together.

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