Novel Radial Flux Coreless Generator

Abstract

This utility model is a novel radial flux coreless generator, mainly comprising a main shaft, support plate, coil winding, inner back iron circular tube, outer back iron circular tube and inner flange, bearing, outer flange, and permanent magnet I and permanent magnet II. The winding armature is tubular, and permanent magnets I and II are radially magnetized. The surface of the coil winding is parallel to the axis of the main shaft. The regular elongated permanent magnets I and II have greater versatility and lower cost compared to the coil winding, significantly increasing armature conductor utilization and boosting the rated power of the single unit. Its cylindrical shape makes it suitable for a wider range of applications. Compared to generators of the same diameter, the elongated permanent magnet structure with radial magnetic field provides more pole pairs than the fan-shaped permanent magnet structure with axial magnetic field, thus improving low-speed power generation efficiency. Furthermore, it features a simple structure, mature processing technology, and low overall manufacturing cost, improving the economic indicators and sustainable development of small and medium-power wind turbines.

Description

Technical Field

[0001] This utility model belongs to the technical field of wind power generation devices and relates to a novel radial flux coreless generator. Background Technology

[0002] Wind power generation is a method of generating electricity by converting wind turbines into electrical energy. Wind power is a widely distributed, free, clean, and renewable energy source with advantages such as maintaining environmental balance and improving energy efficiency. Direct-drive small and medium-power wind turbine generator sets require better performance requirements for low starting torque and high power generation efficiency, which directly affects the starting performance and power generation performance at low speeds. Direct-drive small and medium-power wind turbine generator sets typically use a disc-type stator coreless axial magnetic field (AFPM) permanent magnet generator as the power generation unit, hereinafter referred to as a disc generator. Specifically, ① Disc generators have small radial dimensions and are mainly suitable for applications requiring a flat structure, but are not suitable for conventional lift-type wind turbines; ② Disc generators with a single stator armature structure have a smaller rated power and are suitable for low-power generation; ③ Low-speed disc generators usually use a larger number of pole pairs. Due to the limitation of the effective space of the disc generator, the use of high-performance fan-shaped permanent magnets with high irregularity results in high production costs. At the same time, the effective part of its armature conductor is arranged radially, which reduces the overall utilization rate of the armature conductor.

[0003] In summary, the existing method of using a disc-structured stator coreless axial magnetic field (AFPM) permanent magnet generator as the power generation unit in direct-drive small-to-medium power wind turbine generators suffers from several drawbacks. These include insufficient applicability of the small radial dimension structure, low rated power of a single stator armature, high production costs, and low overall utilization of the armature conductors. Therefore, addressing these issues—namely, the insufficient applicability of the small radial dimension structure, low rated power of a single stator armature, high production costs, and low overall utilization of the armature conductors—is a crucial technical challenge that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] To solve the above technical problems, this utility model provides a novel radial flux coreless generator.

[0005] To achieve the above objectives, this utility model provides the following solution: Specifically, a support plate is fixedly mounted near the middle of the main shaft. The support plate is disc-shaped, and multiple frames are evenly arranged along its outer surface. The middle sections of the frames are fixedly connected to corresponding positions on the support plate. The frames are elongated, and coil windings are wound on them. The surfaces of the coil windings are parallel to the axis of the main shaft. Multiple coil windings are combined through corresponding electrical connections to form the winding armature of the generator. The inner ring flange is fixedly connected to the inner back iron tube at corresponding positions, and the inner ring flange is rotatably connected to the main shaft through corresponding bearings. At corresponding positions on one end of the inner back iron tube, the outer ring flange is connected to the inner back iron tube at corresponding positions. The corresponding positions at both ends of the outer back iron tube are fixedly connected to the corresponding positions of the outer ring flange; that is, the inner back iron tube, outer back iron tube, support plate, winding armature and main shaft are coaxial; multiple permanent magnets I arranged in alternating N and S polarities are attached to the outer circular surface of the inner back iron tube, and permanent magnets I are radially magnetized; multiple permanent magnets II arranged in alternating N and S polarities are attached to the inner circular surface of the outer back iron tube, and permanent magnets II are radially magnetized; one end of the connecting cable is electrically connected to the corresponding terminal of the winding armature / coil winding, and the other end of the connecting cable is led out from the wire hole of the main shaft through the reserved hole of the support plate.

[0006] The generator is cylindrical in shape, and its winding armature has a cylindrical structure. Permanent magnet I and permanent magnet II are arranged in corresponding groups. Each group of permanent magnet I and permanent magnet II generates a radially consistent air gap magnetic field. That is, the N and S polarities of each group of permanent magnet I and permanent magnet II are consistent in the radial direction, and the N and S polarities of adjacent groups of permanent magnet I and permanent magnet II are opposite in the radial direction.

[0007] The stator of the generator is composed of a main shaft, a support plate, a frame, and coil windings; the rotor of the generator is composed of an inner back iron tube, an outer back iron tube, corresponding inner ring flanges, bearings, outer ring flanges, permanent magnet I, and permanent magnet II.

[0008] The generator operates on the following principle: the main shaft is fixedly installed on the base of the wind turbine, and the impeller of the wind turbine is fixedly installed on the outer back iron tube or outer flange. When the external wind drives the impeller of the wind turbine, it drives the outer back iron tube, outer flange, inner back iron tube and permanent magnet I and permanent magnet II to rotate. The radial magnetic field generated by the continuously alternating pair / group of permanent magnet I and permanent magnet II alternately cuts the corresponding coil windings, thereby realizing electromagnetic induction power generation and outputting it to the load end through the connecting cable to complete the wind power generation process.

[0009] The present invention achieves the following technical advantages over the prior art: This utility model discloses a novel radial flux coreless generator, which mainly includes a stator composed of a main shaft, a support plate, a frame, and coil windings. The overall structure of its winding armature is cylindrical. The rotor is composed of an inner back iron cylindrical tube, an outer back iron cylindrical tube, an inner ring flange, a bearing, an outer ring flange, and permanent magnet I and permanent magnet II. The whole machine is cylindrical. Its permanent magnet I and permanent magnet II are radially magnetized, and the surface of the coil windings is parallel to the axis of the main shaft.

[0010] This configuration, compared to the existing technology of using a disc-structured stator coreless axial magnetic field (AFPM) permanent magnet generator as the power generation unit in direct-drive small and medium-power wind turbine generators, mainly includes a stator composed of a main shaft, support disk, frame, and coil windings. The overall structure of its winding armature is cylindrical. The rotor, composed of an inner back iron cylindrical tube, an outer back iron cylindrical tube, an inner flange, bearings, an outer flange, and permanent magnets I and II, is cylindrical and has a wider range of applications. Its permanent magnets I and II are radially magnetized, and the surface of the coil windings is parallel to the axis of the main shaft. Because its permanent magnets I and II are radially magnetized, the rotor is more suitable for a wider range of applications. The coil windings are all in a regular, elongated shape, which makes permanent magnet I and permanent magnet II more versatile and reduces costs. The large effective portion of the coil windings can significantly improve the utilization rate of the armature conductor and increase the rated power of a single unit. Compared with generators of the same diameter, the elongated permanent magnet structure with a radial magnetic field can obtain more pole pairs than the sector-shaped permanent magnet structure with an axial magnetic field, thus improving the generator's low-speed power generation efficiency. At the same time, it also has the advantages of simple structure, mature processing technology and low overall manufacturing cost, which can improve the economic indicators of small and medium power wind turbines. It can also more effectively reduce the emission of greenhouse gases such as carbon dioxide, which is beneficial to environmental protection and sustainable development. Attached Figure Description

[0011] The accompanying drawings illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification.

[0012] Figure 1 This is a top view of the overall structure of an embodiment of the present utility model; Figure 2 This is a frontal view of the overall structure of an embodiment of the present utility model; Figure 3 for Figure 1 AA section view; Figure 4 This is an electrical schematic diagram of an embodiment of the present utility model; Explanation of reference numerals in the attached figures: 1-Spindle; 2-Support plate; 3-Frame; 4-Coil winding; 5-Permanent magnet I; 6-Permanent magnet II; 7-Bearing; 8-Inner ring flange; 9-Outer ring flange; 10-Inner back iron round tube; 11-Connecting cable; 12-Outer back iron round tube; 13-Wire passage hole; Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by other people skilled in the art without creative effort are within the protection scope of the present utility model.

[0014] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] refer to Figures 1-4 As shown, the arrow points forward, illustrating the novel radial flux coreless generator provided in this embodiment of the present invention.

[0016] Specifically, viewed from above, from the front, and in cross-section, a support plate 2 is fixedly mounted near the middle of the main shaft 1. The support plate 2 is disc-shaped, and multiple skeletons 3 are evenly arranged along its outer circumference. The middle sections of the skeletons 3 are fixedly connected to corresponding positions on the support plate 2. The skeletons 3 are elongated, and coil windings 4 are wound on them. The surface of the coil windings 4 is parallel to the axis of the main shaft 1. Multiple coil windings 4 are combined through corresponding electrical connections to form the winding armature of the generator. The inner ring flanges 8 are fixedly connected to the inner back iron tube 10 at corresponding positions, and the inner ring flanges 8 are rotatably connected to the main shaft 1 through corresponding bearings 7. The outer ring flanges 8 are fixedly connected to the inner back iron tube 10 at corresponding positions on one end. The corresponding positions of 9 are fixedly connected, and the corresponding positions of both ends of the outer back iron tube 12 are fixedly connected to the corresponding positions of the outer ring flange 9 respectively; that is, the inner back iron tube 10, the outer back iron tube 12, the support plate 2, the winding armature and the main shaft 1 are coaxial; multiple permanent magnets I5 arranged in alternating N and S polarities are attached to the outer circular surface of the inner back iron tube 10, and the permanent magnets I5 are radially magnetized; multiple permanent magnets II6 arranged in alternating N and S polarities are attached to the inner circular surface of the outer back iron tube 12, and the permanent magnets II6 are radially magnetized; one end of the connecting cable 11 is electrically connected to the corresponding terminals of the winding armature / coil winding 4 respectively, and the other end of the connecting cable 11 is led out from the wire hole 13 of the main shaft 1 along the reserved hole of the support plate 2.

[0017] The generator is cylindrical in shape, and the overall structure of the winding armature is tubular. Permanent magnet I5 and permanent magnet II6 are arranged in corresponding groups. Each group of permanent magnet I5 and permanent magnet II6 generates a radially consistent air gap magnetic field. That is, the N and S polarities of each group of permanent magnet I5 and permanent magnet II6 are consistent in the radial direction, and the N and S polarities of adjacent groups of permanent magnet I5 and permanent magnet II6 are opposite in the radial direction.

[0018] The stator of the generator is composed of a main shaft 1, a support plate 2, a frame 3, and coil windings 4; the rotor of the generator is composed of an inner back iron tube 10, an outer back iron tube 12, and corresponding inner ring flanges 8, bearings 7, outer ring flanges 9, as well as permanent magnets I 5 and II 6.

[0019] The generator operates on the following principle: the main shaft 1 is fixedly installed with the base of the wind turbine, and the impeller of the wind turbine is fixedly installed with the outer back iron tube 12 or the outer ring flange 9. When the external wind drives the impeller of the wind turbine to rotate, it drives the outer back iron tube 12, the outer ring flange 9, the inner back iron tube 10 and the permanent magnet I 5 and permanent magnet II 6 to rotate. The radial magnetic field generated by the continuously alternating pair / group of permanent magnet I 5 and permanent magnet II 6 forms an alternating cut with the corresponding coil winding 4, thereby realizing electromagnetic induction power generation and outputting it to the load end through the connecting cable 11 to complete the wind power generation process.

[0020] This specification uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

[0021] Those skilled in the art should understand that the above embodiments are merely for clearly illustrating the present invention and are not intended to limit the scope of the present invention. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of the present invention.

Claims

1. A novel radial flux coreless generator characterized by: A support plate (2) is fixedly installed near the middle of the main shaft (1). Multiple frames (3) are evenly arranged along the outer circular surface of the support plate (2). The corresponding positions of the middle sections of the frames (3) are fixedly connected to the corresponding positions of the support plate (2). The coil windings (4) are wound on the frames (3). Multiple coil windings (4) are combined to form the winding armature of the generator through corresponding electrical connections. The inner ring flange (8) is fixedly connected to the corresponding positions of the inner back iron tube (10). The inner ring flange (8) is rotatably connected to the main shaft (1) through corresponding bearings (7). The corresponding positions of one end of the inner back iron tube (10) are respectively connected to the corresponding positions of the outer ring flange (9). Fixed connection, the corresponding positions at both ends of the outer back iron tube (12) are fixedly connected to the corresponding positions of the outer ring flange (9); multiple permanent magnets I (5) arranged alternately with N and S polarities are attached to the outer circular surface of the inner back iron tube (10), and the permanent magnets I (5) are radially magnetized; multiple permanent magnets II (6) arranged alternately with N and S polarities are attached to the inner circular surface of the outer back iron tube (12), and the permanent magnets II (6) are radially magnetized; one end of the connecting cable (11) is electrically connected to the corresponding terminals of the winding armature / coil winding (4), and the other end of the connecting cable (11) is led out from the wire hole (13) of the main shaft (1) along the reserved hole of the support plate (2).

2. The novel radial flux coreless electric generator of claim 1, characterized by: The generator is cylindrical in shape, and the overall structure of the winding armature is cylindrical. Permanent magnet I (5) and permanent magnet II (6) are set in corresponding groups. Each group of permanent magnet I (5) and permanent magnet II (6) generates a radially consistent air gap magnetic field. That is, the N and S polarities of each group of permanent magnet I (5) and permanent magnet II (6) are consistent in the radial direction, and the N and S polarities of adjacent groups of permanent magnet I (5) and permanent magnet II (6) are opposite in the radial direction.

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