Generator

Abstract

The invention relates to the technical field of generators, in particular to a generator. The generator comprises a base, a stator assembly, an impeller and a rotor assembly, a mounting cavity is formed in the base, and openings communicated with the outside are formed in the two opposite sides of the mounting cavity; the stator assembly is fixedly arranged in the mounting cavity, and the axial direction of the stator assembly is parallel to the arrangement direction of the openings in the mounting cavity; the impeller is rotationally arranged on the inner side of the stator assembly in the radial direction of the stator assembly, and the impeller and the stator assembly are coaxially arranged; the rotor assembly is arranged around the impeller in the circumferential direction of the stator assembly, and the inner side of the rotor assembly is connected with the impeller in the radial direction of the stator assembly so that the rotor assembly can synchronously rotate along with the impeller. According to the technical scheme, the energy conversion efficiency of the generator can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of generators, and in particular to a generator. Background Art

[0002] With the growing global demand for clean energy, ocean tidal energy, a renewable, predictable, and high-energy-density energy source, has become an important focus of new energy development. However, the energy conversion efficiency of generators used in related technologies is low, which affects the utilization of ocean tidal energy. Therefore, there is an urgent need to provide a generator that improves its energy conversion efficiency and, therefore, the utilization of ocean tidal energy. Summary of the Invention

[0003] The present application provides a generator that can improve the energy conversion efficiency of the generator.

[0004] The present application provides a generator, which includes a base, a stator assembly, an impeller and a rotor assembly. The base has an installation cavity, and the installation cavity has first openings communicating with the outside on opposite sides. The stator assembly is fixed in the installation cavity, and the axial direction of the stator assembly is parallel to the arrangement direction of the first openings on the installation cavity. Along the radial direction of the stator assembly, the impeller is rotatably arranged on the inner side of the stator assembly, and the impeller and the stator assembly are coaxially arranged. Along the circumferential direction of the stator assembly, the rotor assembly is arranged around the impeller, and along the radial direction of the stator assembly, the inner side of the rotor assembly is connected to the impeller, so that the rotor assembly rotates synchronously with the impeller.

[0005] In the technical solution provided by this application, the generator includes a base, a stator assembly, an impeller and a rotor assembly, wherein the base has a mounting cavity, and the opposite sides of the mounting cavity have first openings that communicate with the outside world. Here, the mounting cavity can provide mounting space for the stator assembly, impeller and rotor assembly, and the first openings on both sides can improve the efficiency of liquid passage, make the impeller more balanced, and offset the axial water thrust, thereby helping to improve the energy conversion rate of the generator; the bidirectional first opening design can make the liquid containing impurities (such as mud, sand, etc.) form a self-cleaning cycle, reducing the probability of impurities accumulating in the mounting cavity. The stator assembly is fixed in the mounting cavity, and the axial direction of the stator assembly is parallel to the arrangement direction of the first opening on the mounting cavity. The rotor assembly is arranged on the inner side of the stator assembly through the rotation of the impeller and is coaxial with the stator assembly. In this way, after the liquid enters the mounting cavity through the first opening and impacts the impeller, the kinetic energy and potential energy of the liquid are converted into mechanical energy to drive the impeller to rotate, so that the impeller drives the rotor assembly to generate a rotating magnetic field, and the stator assembly generates an induced electromotive force by rotating the cutting magnetic field, thereby converting mechanical energy into electrical energy. The rotor assembly is arranged around the impeller, along the radial direction of the stator assembly, and the inner side of the rotor assembly is connected to the impeller, so that the rotor assembly rotates synchronously with the impeller. Here, the rotor assembly is directly connected to the periphery of the impeller. On the one hand, it can eliminate the transmission structure between the two, reducing the mechanical losses caused by the transmission structure, realizing the integrated conversion of mechanical energy and electrical energy, and thus improving the energy conversion efficiency of the generator. On the other hand, the rigid synchronous rotation of the rotor assembly and the impeller can reduce inertia delay, shorten the generator's response time to changes in liquid flow, and thus improve the utilization rate of ocean tidal energy.

[0006] In an implementation method provided in an embodiment of the present application, the stator assembly includes a stator core, the stator core includes a stator yoke and a stator tooth portion connected to the stator yoke portion, and along the radial direction of the stator assembly, an auxiliary slot is provided on the side of the stator tooth portion facing away from the stator yoke portion to reduce the cogging torque of the generator.

[0007] In one possible implementation provided in an embodiment of the present application, the cross-section of the auxiliary groove is rectangular.

[0008] In an implementation provided in an embodiment of the present application, at least two auxiliary slots are provided on the stator teeth along the circumference of the stator assembly, and the at least two auxiliary slots are symmetrically arranged about the center line of the stator teeth.

[0009] In an implementation method provided in an embodiment of the present application, the stator assembly includes a stator core and a stator coil, the stator core has core slots for accommodating the stator coil, the rotor assembly includes a magnetic yoke and a permanent magnet fixed on the magnetic yoke, the number of magnetic poles of the permanent magnet is greater than the number of core slots, and the difference between the two is less than the target threshold.

[0010] In an implementation provided in an embodiment of the present application, the ratio of the number of core slots to the product of the number of phases of the generator and the number of magnetic poles of the permanent magnets is a fraction.

[0011] In an implementation method provided in an embodiment of the present application, the stator core includes a stator yoke and a stator tooth portion separately connected to the stator yoke portion. Along the circumference of the stator assembly, a plurality of stator teeth are arranged at intervals, and core slots are formed between adjacent stator teeth. The number of stator coils is the same as the number of stator teeth, so as to correspond one-to-one with the stator teeth.

[0012] In an implementation method provided in an embodiment of the present application, the base further includes a flow guide cover installed at the first opening, and the radial size of the flow guide cover gradually increases in a direction away from the first opening.

[0013] In one possible implementation provided in an embodiment of the present application, the rotor assembly includes a yoke, a permanent magnet and a pressure strip. Along the radial direction of the rotor assembly, the pressure strip is arranged on the outer side surface of the yoke, and multiple pressure strips are arranged at intervals along the circumference of the rotor assembly so that a slot for inserting the permanent magnet is formed between adjacent pressure strips.

[0014] In an implementation method provided in an embodiment of the present application, the generator also includes a first sealing assembly, the first sealing assembly includes a first sealing structure and a second sealing structure, the first sealing structure is covered on the surface of the stator assembly, and the second sealing structure is covered on the surface of the rotor assembly, and the first sealing structure and the second sealing structure are spaced apart along the radial direction of the stator assembly to form an air gap, and the air gap is connected to the first opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 One of the structural schematic diagrams of the generator provided in the embodiment of the present application;

[0016] Figure 2 A schematic diagram of the internal structure of the power generation interface provided in an embodiment of the present application;

[0017] Figure 3 for Figure 2 A magnified schematic diagram of point A in the middle;

[0018] Figure 4 for Figure 2 A magnified schematic diagram of point B in the middle;

[0019] Figure 5 A schematic structural diagram of a bearing assembly provided in an embodiment of the present application;

[0020] Figure 6 A schematic diagram of the structure of the impeller and rotor assembly provided in an embodiment of the present application;

[0021] Figure 7 for Figure 6Cross-sectional view at CC;

[0022] Figure 8 for Figure 6 Partial cross-sectional view at point D in the middle;

[0023] Figure 9 A partial schematic diagram of a stator assembly provided in an embodiment of the present application;

[0024] Figure 10 is the cogging torque variation curve of the auxiliary slot at different slot widths;

[0025] Figure 11 is the cogging torque variation curve of the auxiliary groove at different groove depths;

[0026] Figure 12 The cogging torque variation curves at different angles between the slot opening of the auxiliary slot and the center line of the stator tooth;

[0027] Figure 13 The no-load back EMF waveform and cogging torque curve under different pole-slot combinations;

[0028] Figure 14 A schematic diagram of the state of the potting module provided in an embodiment of the present application when in use;

[0029] Figure 15 A schematic structural diagram of the anti-corrosion and anti-fouling coating structure provided in an embodiment of the present application;

[0030] Figure 16 The second structural diagram of the generator provided in the embodiment of the present application;

[0031] Figure 17 for Figure 16 Enlarged view of point E in the middle;

[0032] Figure 18 A partial schematic diagram of a stator assembly provided in an embodiment of the present application;

[0033] Figure 19 for Figure 18 Schematic diagram of the structure in which the stator coil is mounted on the stator teeth.

[0034] Reference numerals:

[0035] 1-base; 11-mounting cavity; 12-first opening; 13-bearing assembly; 131-bearing mounting structure; 1311-first base; 13111-bearing mounting cavity; 13112-second opening; 13113-third opening; 1312-second base; 13121-shaft hole; 13122-flange; 132-bearing; 133-first sealing cover; 134-second sealing cover; 135-first sealing ring; 136-second sealing ring; 137-third sealing ring; 1 38-Fourth sealing ring; 139-Fifth sealing ring; 14-Rotating shaft; 15-Wear-resistant layer; 2-Stator assembly; 21-Stator core; 211-Stator tooth; 2111-First protrusion; 2112-Limiting protrusion; 2113-Auxiliary slot; 212-Stator yoke; 2121-Yoke section; 21211-First mounting slot; 21212-Second protrusion; 21213-Second mounting slot; 213-First splicing surface; 214-Second splicing surface; 22-Limiting structure; 221 -first stopper; 222 -second stopper; 23 -fixing structure; 231 -fastener; 24 -stator coil; 25 -insulating paperboard; 26 -slot wedge; 3 -rotor assembly; 31 -magnetic yoke; 32 -permanent magnet; 33 -pressing strip; 4 -first sealing assembly; 41 -first sealing structure; 411 -sealing housing; 4111 -first baffle; 4112 -second baffle; 4113 -annular pressure plate; 412 -first sealing member; 42 -second sealing structure; 421 -second sealing member; 5-Second sealing assembly; 51-Third sealing structure; 511-First skeleton oil seal; 512-Second skeleton oil seal; 52-Fourth sealing structure; 521-Lip seal ring; 6-Impeller; 61-Blade; 62-Hub; 621-Hub inner sleeve; 622-Hub outer sleeve; 7-Deflector; 8-Anti-corrosion and anti-fouling coating structure; 81-Anti-rust primer layer; 82-Middle connecting paint layer; 83-Anti-fouling layer; 9-Potting mold; 91-Potting body; 92-Potting cover; 921-Glue injection hole. DETAILED DESCRIPTION

[0036] It should be noted that, unless there is a conflict, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of this application and should not be regarded as an improper restriction on this application.

[0037] To make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the specific technical solutions of the present application will be further described in detail below in conjunction with the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application but are not intended to limit the scope of the present application.

[0038] In the embodiments of the present application, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "multiple" means two or more.

[0039] In addition, in the embodiments of the present application, directional terms such as "up", "down", "left" and "right" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they may change accordingly according to changes in the orientation of the components in the drawings.

[0040] In the embodiments of the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integrated connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0041] In the embodiments of the present application, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0042] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0043] In the embodiments of this application, for the convenience of describing the direction, Figure 2 The directions are indicated in the figure, wherein the first direction is the arrangement direction of the first openings 12, and the second direction is the radial direction of the stator assembly 2. It should be noted that the above direction indications are only used to describe the present application, but are not used to limit the scope of the present application.

[0044] With the growing global demand for clean energy, ocean tidal energy, a renewable, predictable, and high-energy-density energy source, has become an important focus of new energy development. However, the energy conversion efficiency of generators used in related technologies is low, which affects the utilization of ocean tidal energy. Therefore, there is an urgent need to provide a generator that improves its energy conversion efficiency and, therefore, the utilization of ocean tidal energy.

[0045] To solve the above problems, refer to Figure 1 and Figure 2 , an embodiment of the present application provides a generator, which includes a base 1, a stator assembly 2, an impeller 6 and a rotor assembly 3. The base 1 has an installation cavity 11, and the installation cavity 11 has two opposite sides with first openings 12 connected to the outside world; the stator assembly 2 is fixed in the installation cavity 11, and the axial direction of the stator assembly 2 is parallel to the arrangement direction of the first openings 12 on the installation cavity 11; along the radial direction of the stator assembly 2, the impeller 6 is rotatably arranged on the inner side of the stator assembly 2, and the impeller 6 and the stator assembly 2 are coaxially arranged; along the circumferential direction of the stator assembly 2, the rotor assembly 3 is arranged around the impeller 6, and along the radial direction of the stator assembly 2, the inner side of the rotor assembly 3 is connected to the impeller 6, so as to make the rotor assembly 3 rotate synchronously with the impeller 6.

[0046] In the embodiment of the present application, according to the working principle of the engine, the generator can be a horizontal-axis underwater generator, a vertical-axis underwater generator, or a floating underwater generator, and the embodiment of the present application does not limit this.

[0047] In the embodiment of the present application, the frame 1 is the outer shell and support structure of the generator, used to fix and protect the internal core components (stator assembly 2, rotor assembly 3, impeller 6, etc.) and provide mechanical connection to the external foundation. The frame 1 is usually made of high-strength metal (cast iron, cast steel, or welded steel plate).

[0048] In the embodiment of the present application, the stator assembly 2 includes a stator core 21 and a stator coil 24, which serves as the stationary part of the generator. The stator assembly 2 generates an induced electromotive force by rotating and cutting a magnetic field, thereby outputting electrical energy.

[0049] In the embodiment of the present application, the impeller 6 is a rotating power capture structure that directly bears the impact of the liquid. The specially designed blades 61 can convert the kinetic energy or potential energy of the liquid into mechanical energy, thereby driving the rotor assembly 3 to rotate and generate electricity.

[0050] In one possible embodiment of the present application, the impeller 6 may be a bidirectional impeller. In this way, when the liquid direction is reversed (such as tidal fluctuations or switching between pumped storage modes), the same rotation direction can be maintained, thereby continuously driving the rotor assembly 3 to rotate and generate electricity.

[0051] Reference Figure 6 and Figure 7 In the embodiment of the present application, the impeller 6 may include a hub 62 and blades 61 connected to the hub 62. Along the radial direction of the stator assembly 2, one end of the blade 61 may be connected to the hub 62, and the other end of the blade 61 may be connected to the inner side of the rotor assembly 3 to serve as a support for the rotor assembly 3.

[0052] Reference Figure 6 and Figure 7 In this embodiment of the present application, the wheel hub 62 may further include a wheel hub inner sleeve 621 and a wheel hub outer sleeve 622. The outer wall of the wheel hub inner sleeve 621 is provided with a protrusion, and the inner wall of the wheel hub outer sleeve 622 is provided with a groove that engages with the protrusion, so that the wheel hub outer sleeve 622 and the wheel hub inner sleeve 621 are locked and fixed. In addition, the wheel hub inner sleeve 621 is coaxially connected to the rotating shaft 14 on the machine base 1 via a key.

[0053] In the embodiment of the present application, the inner hub sleeve 621 and the outer hub sleeve 622 can be made of two different materials. For example, the inner hub sleeve 621 can be made of iron, and the outer hub sleeve 622 can be made of cast aluminum alloy. In other possible embodiments, depending on the operating requirements of the generator and the load borne by the blades 61, the inner hub sleeve 621 and the outer hub sleeve 622 can also be made of other materials, such as structural steel, fiberglass, carbon fiber, etc., which are not limited in this embodiment of the present application.

[0054] In an embodiment of the present application, the rotor assembly 3 includes a rotor core, which includes a yoke 31 and a permanent magnet 32 ​​arranged on the yoke 31. The rotor core is rotated by the impeller 6 and is arranged on the inner side of the stator assembly 2, and is coaxially arranged with the stator assembly 2 to provide a rotating magnetic field to the stator assembly 2.

[0055] In the technical solution provided in the embodiment of the present application, the generator includes a base 1, a stator assembly 2, an impeller 6 and a rotor assembly 3, wherein the base 1 has an installation cavity 11, and the opposite sides of the installation cavity 11 have openings connected to the outside world. Here, the installation cavity 11 can provide installation space for the stator assembly 2, the impeller 6 and the rotor assembly 3. The openings on both sides can improve the efficiency of liquid passage, make the impeller 6 more balanced in force, and offset the axial water thrust, thereby helping to improve the energy conversion rate of the generator; the two-way opening design can make the liquid containing impurities (such as mud, sand, etc.) form a self-cleaning cycle, reducing the probability of impurities accumulating in the installation cavity 11. The stator assembly 2 is fixed in the installation cavity 11, and the axial direction of the stator assembly 2 is parallel to the arrangement direction of the openings on the installation cavity 11. The rotor assembly 3 is arranged on the inner side of the stator assembly 2 through the rotation of the impeller 6, and is coaxial with the stator assembly 2. In this way, after the liquid enters the mounting cavity 11 through the opening and impacts the impeller 6, the kinetic energy and potential energy of the liquid are converted into mechanical energy to drive the impeller 6 to rotate, so that the impeller 6 drives the rotor assembly 3 to generate a rotating magnetic field, and the stator assembly 2 generates an induced electromotive force by rotating the cutting magnetic field, thereby converting the mechanical energy into electrical energy. The rotor assembly 3 is arranged around the impeller 6, along the radial direction of the stator assembly 2, and the inner side of the rotor assembly 3 is connected to the impeller 6, so as to make the rotor assembly 3 rotate synchronously with the impeller 6. Here, the rotor assembly 3 is directly connected to the periphery of the impeller 6. On the one hand, the transmission structure between the two can be eliminated, reducing the mechanical loss caused by the transmission structure, realizing the integrated conversion of mechanical energy and electrical energy, thereby improving the energy conversion efficiency of the generator; on the other hand, the rigid synchronous rotation of the rotor assembly 3 and the impeller 6 can reduce the inertia delay, shorten the response time of the generator to the change of liquid flow, and thus improve the utilization rate of the ocean tidal energy.

[0056] In this embodiment of the present application, the rotor assembly 3 is directly connected to the periphery of the impeller 6. This also reduces the axial dimension of the generator in the rotor assembly 3, making the generator more compact and easier to install and move. Furthermore, the ratio of the radial length to the axial length of the generator can be greater than 20. This, on the one hand, concentrates the generator's mass in the radial direction, helping to reduce the generator's moment of inertia; on the other hand, the large radial dimension provides a larger surface area, which helps improve the generator's heat dissipation efficiency.

[0057] Reference Figure 9In the embodiment of the present application, the stator assembly 2 includes a stator core 21, which includes a stator yoke 212 and stator teeth 211 connected to the stator yoke 212. Auxiliary slots 2113 are provided on the radial side of the stator teeth 211, facing away from the stator yoke 212, to reduce the cogging torque of the generator. Cogging torque is a periodic torque pulsation generated by the interaction between the magnetic field of the generator's permanent magnets 32 and the stator teeth 211. Its essence is the fluctuation of the magnetic drag torque caused by the change in magnetic field energy as the rotor assembly 3 changes position. Here, along the radial direction of the stator assembly 2, an auxiliary slot 2113 is provided on the side of the stator tooth 211 facing away from the stator yoke 212. On the one hand, the auxiliary slot 2113 can split the magnetic permeance distribution of the stator tooth 211 from a single harmonic into multiple higher-order harmonics, and create a phase difference between the higher-order harmonics and the main harmonics, thereby partially offsetting the magnetic field energy. On the other hand, the auxiliary slot 2113 can form a local low-reluctance channel on the stator tooth surface, forcing the magnetic flux originally concentrated at the tooth top to flow to both sides, thereby smoothing the magnetic flux distribution and achieving the effect of reducing the generator's cogging torque. Reducing the generator's cogging torque allows the generator to start generating electricity at lower flow rates, expanding the generator's effective operating range and helping to further improve the utilization of ocean tidal energy.

[0058] In the embodiment of the present application, the shape of the auxiliary groove 2113 may be various. For example, the cross-section of the auxiliary groove 2113 may be a trapezoid, a semicircle, or a triangle. The embodiment of the present application does not limit this. Figure 9 In one possible embodiment of the present application, the cross-section of the auxiliary slot 2113 is rectangular. Here, the rectangular slot 2113 can, on the one hand, generate a strong magnetic field modulation effect due to its right-angled edges. By controlling the slot width and slot depth, the fundamental amplitude of the cogging torque can be effectively reduced. Furthermore, the rectangular slot is easy to manufacture, which can reduce production costs.

[0059] In the embodiment of the present application, there are many possibilities for the number of auxiliary slots 2113 on a single stator tooth 211. For example, the number of auxiliary slots 2113 on a single stator tooth 211 can be one, two, or three, which is not limited in the embodiment of the present application.

[0060] In one possible embodiment of the present application, at least two auxiliary slots 2113 are spaced apart on the stator tooth 211 along the circumference of the stator assembly 2, and the at least two auxiliary slots 2113 are symmetrically arranged about the centerline of the stator tooth 211. The at least two auxiliary slots 2113 are spaced apart on the stator tooth 211, and the at least two auxiliary slots 2113 can provide targeted suppression of cogging torque harmonics of different orders, thereby achieving a better reduction in the generator's cogging torque. The at least two auxiliary slots 2113 are symmetrically arranged about the centerline of the stator tooth 211. In this way, the auxiliary slots 2113 symmetrically arranged on either side of the centerline of the stator tooth 211 generate magnetic field harmonics with opposite phases. When the main harmonic passes through the symmetrically arranged auxiliary slots 2113, the harmonic components modulated by the auxiliary slots 2113 on either side of the centerline of the stator tooth 211 form a 180° phase difference at the centerline of the stator tooth 211, thereby achieving vector cancellation.

[0061] In the embodiment of the present application, the influence of the auxiliary slots 2113 on the cogging torque is not only reflected in the number of the auxiliary slots 2113, but is also closely related to the depth and width of the slots. If the auxiliary slots 2113 are too small, the effect of suppressing the cogging torque is minimal. If they are too large, the magnetic permeability of part of the air gap will increase, thereby affecting the armature magnetic circuit.

[0062] Reference Figure 9 and Figure 10 In the embodiment of the present application, there are many possibilities for designing the slot width a of the auxiliary slot 2113 on the stator tooth portion 211. For example, the slot width a can be 1 mm, 3 mm, or 5 mm, and the embodiment of the present application does not limit this.

[0063] Reference Figure 9 and Figure 11 In the embodiment of the present application, there are many possibilities for designing the slot depth h of the auxiliary slot 2113 on the stator tooth portion 211. For example, the slot depth h can be 1 mm, 2 mm, or 5 mm, and the embodiment of the present application does not limit this.

[0064] Reference Figure 9 and Figure 12 In the embodiment of the present application, there are many possibilities for designing the angle θ between the slot orientation of the auxiliary slot 2113 on the stator tooth portion 211 and the center line of the stator tooth portion 211. For example, the angle θ can be 0°, 0.4°, or 1°, and the embodiment of the present application does not impose any restrictions on this.

[0065] In one embodiment of the present application, the groove width a can be 3 mm, the groove depth h can be 2 mm, and the angle θ can be 0.4°. This design can effectively optimize the cogging torque. The peak value of the cogging torque can be reduced from 2.2088 Nm to 1.354 Nm, thereby achieving a good optimization effect on the cogging torque.

[0066] In the embodiment of the present application, the stator assembly 2 includes a stator core 21 and a stator coil 24. The stator core 21 has core slots for accommodating the stator coils 24. The rotor assembly 3 includes a yoke 31 and a permanent magnet 32 ​​fixedly disposed on the yoke 31. The number of magnetic poles of the permanent magnet 32 ​​is greater than the number of core slots, and the difference between the two is less than the target threshold. That is, the number of magnetic poles of the permanent magnet 32 ​​is slightly greater than the number of core slots. In this way, during the operation of the generator, the magnetic poles of the permanent magnet 32 ​​cannot be aligned with all the stator teeth 211 at the same time, which destroys the symmetry of the magnetic field and increases the common multiple of the number of magnetic poles of the permanent magnet 32 ​​and the number of core slots. The cogging torque can be expressed by the following Fourier series: Where, T cog is the cogging torque, μ0 is the air magnetic permeability; L s is the effective axial length of the core; R1 is the armature radius of the generator; R2 is the inner radius of the stator yoke; z is the number of core slots; 2p is the number of magnetic poles of the permanent magnet 32; N L is the least common multiple of z and 2p; α is the rotation angle of the rotor assembly; n is a natural number; and are the Fourier transforms of the air gap permeability and air gap flux density, respectively. L It can be seen that the harmonic order of the cogging torque is the common multiple of the number of poles 2p and the number of slots z, where the least common multiple of 2p and z is N L is the fundamental order of the cogging torque. As can be seen from the characteristics of the Fourier series, the higher the harmonic order of the cogging torque, the smaller the amplitude of the corresponding cogging torque harmonic component, thereby achieving the effect of reducing the cogging torque.

[0067] In the embodiment of the present application, there are many possibilities for designing the above-mentioned target threshold. For example, the target threshold can be 2, 3, or 4, and the embodiment of the present application does not limit this.

[0068] In the embodiment of the present application, the ratio between the number of core slots and the product of the number of generator phases and the number of magnetic poles of the permanent magnets 32 is a fraction. This design, known as a fractional slot winding, disrupts the periodic alignment of the magnetic poles of the permanent magnets 32 and the core slots, making the magnetic resistance variation more dispersed during the rotation of the rotor assembly 3, thereby smoothing torque fluctuations.

[0069] In the embodiment of the present application, there are many possible designs for the number of magnetic poles of the permanent magnet 32 ​​and the number of core slots. For example, the number of magnetic poles of the permanent magnet 32 ​​can be 48, and the number of core slots can be 54; or, the number of magnetic poles of the permanent magnet 32 ​​can be 48, and the number of core slots can be 72. This embodiment of the present application does not impose any restrictions on this.

[0070] In a possible embodiment of the present application, the power of the generator may be 10 kilowatts, the number of magnetic poles 2p of the permanent magnet 32 ​​may be 48, and the number of core slots z may be 54. Figure 13 The no-load back EMF waveform and cogging torque curve of the matching relationship between the number of magnetic poles 2p of the permanent magnet 32 ​​and the number of core slots Q (hereinafter referred to as pole-slot matching) are analyzed in combination with the following table:

[0071] Cogging torque under different pole-slot combinations

[0072]

[0073] It can be seen that the pole-slot matching has a great influence on the no-load back EMF waveform. When the ratio between the number of core slots and the number of magnetic poles of the permanent magnet 32 ​​is a fraction, the voltage distortion rate is small. For example, the number of magnetic poles 2p of the permanent magnet 32 ​​is 48, and the number of core slots Q is 54. When the ratio between the number of core slots Q and the number of magnetic poles 2p of the permanent magnet 32 ​​is an integer, the voltage distortion rate is large. For example, the number of magnetic poles of the permanent magnet 32 ​​is 48, and the number of core slots is 144. When the number of core slots Q is relatively small and the number of magnetic poles 2p of the permanent magnet 32 ​​is large or close to the number of core slots Q, the no-load back EMF waveform is closer to a sine wave. For example, the number of magnetic poles 2p of the permanent magnet 32 ​​is 48, and the number of core slots Q is 54.

[0074] In addition, according to the above table, when the number of magnetic poles 2p of the permanent magnet 32 ​​is 48 and the number of core slots Q is 54, the maximum value of the cogging torque is 2.2088 N·m, the minimum value is -2.1873 N·m, and the torque ripple value is 4.3961 N·m, accounting for 0.64% of the driving torque of the generator; when the number of magnetic poles 2p of the permanent magnet 32 ​​is 48 and the number of core slots Q is 72, the maximum value of the cogging torque is 3.7321 N·m, with a minimum value of -3.4820 N·m and a torque ripple value of 7.2142 N·m, accounting for 1.06% of the generator's driving torque. When the number of magnetic poles 2p of the permanent magnet 32 ​​is 48 and the number of core slots Q is 144, the maximum cogging torque is 59.3846 N·m and the minimum value is -59.3348 N·m. The torque ripple value is 118.7194 N·m, accounting for 17.4% of the generator's driving torque. It can be seen that when the number of magnetic poles 2p of the permanent magnet 32 ​​is 48 and the number of core slots Q is 54, the cogging torque can be effectively reduced.

[0075] In the embodiment of the present application, when the number of magnetic poles 2p of the permanent magnet 32 ​​is 48, the number of core slots z is 54, and the stator tooth portion 211 does not have an auxiliary slot 2113, the least common multiple N of the number of magnetic poles 2p of the permanent magnet 32 ​​and the number of magnetic poles z of the core slots is LWhen two auxiliary slots 2113 are provided on the stator tooth portion 211, the N L The increase to 1296 significantly weakens the cogging torque of the motor. This is because the auxiliary slots 2113 divide the stator teeth 211 into smaller magnetic resistance units, which is equivalent to increasing the number of equivalent slots in the stator core 21, thereby increasing the least common multiple N of the number of magnetic poles 2p of the permanent magnet 32 ​​and the number of magnetic poles z of the core slots. L .

[0076] Reference Figure 9 In one possible embodiment of the present application, two auxiliary slots 2113 are provided on a single stator tooth 211. These two auxiliary slots 2113 are symmetrically arranged about the centerline of the stator tooth 211. This effectively reduces the peak value of the cogging torque and further weakens the cogging torque. Furthermore, the symmetrical arrangement of the two auxiliary slots 2113 about the centerline of the stator tooth 211 can also avoid the introduction of new harmonics.

[0077] Reference Figure 16 、 Figure 17 and Figure 18 In the embodiment of the present application, the stator core 21 includes a stator yoke 212 and stator teeth 211 separately connected to the stator yoke 212. Along the circumference of the stator assembly 2, a plurality of stator teeth 211 are arranged at intervals, and core slots are formed between adjacent stator teeth 211. The number of stator coils 24 is the same as the number of stator teeth 211, so as to correspond one-to-one with the stator teeth 211. Here, the stator teeth 211 are connected to the stator yoke 212, and the number of stator coils 24 is the same as the number of stator teeth 211, so that only one stator coil 24 is wound around each stator tooth 211, that is, the stator coils 24 correspond one-to-one with the stator teeth 211. Such a design can, on the one hand, reduce the end length of the stator coil 24, thereby reducing resistance loss; on the other hand, the stator coil 24 corresponds one-to-one with the stator tooth 211. After a single stator coil 24 is damaged, it can be replaced specifically without the need for overall rewinding, thereby improving the convenience of generator maintenance.

[0078] Reference Figure 1 and Figure 2 In this embodiment of the present application, the base 1 further includes a flow deflector 7 mounted at the first opening 12. The radial dimension of the flow deflector 7 gradually increases as it moves away from the opening. This creates a suction effect within the mounting cavity 11 as liquid passes through the flow deflector 7, allowing more liquid to flow into the mounting cavity 11. This accelerates the flow of liquid and improves the generator's energy efficiency.

[0079] Reference Figure 8In the embodiment of the present application, the rotor assembly 3 includes a yoke 31, permanent magnets 32, and a bead 33. The bead 33 is disposed on the outer side of the yoke 31 in the radial direction of the rotor assembly 3. Multiple bead 33 are spaced apart along the circumference of the rotor assembly 3, so that slots for the permanent magnets 32 are formed between adjacent bead 33. The bead 33 is arranged at intervals to form slots, which constrain the permanent magnets 32 in both the radial and circumferential directions, preventing the permanent magnets 32 from being displaced or thrown out due to centrifugal force during high-speed rotation.

[0080] In the embodiment of the present application, there are many possible connection relationships between the pressure strip 33 and the yoke 31. For example, the pressure strip 33 and the yoke 31 can be fixed by bonding; or, screw holes are processed on the outer surface of the yoke 31, and the pressure strip 33 is fixed to the outer surface of the yoke 31 by fasteners 231. This embodiment of the present application does not limit this.

[0081] In the embodiment of the present application, the structural design of the pressure strip 33 has many possibilities, for example, referring to Figure 8 The cross section of the bead 33 can be trapezoidal, so that a trapezoidal slot is formed between two adjacent beadings 33. After the permanent magnet 32 ​​is inserted into the trapezoidal slot, the trapezoidal slot can provide a limit for the permanent magnet 32, thereby reducing the risk of the permanent magnet 32 ​​falling off.

[0082] In the embodiment of the present application, the permanent magnet 32 ​​has various possible structural forms. For example, the permanent magnet 32 ​​can be magnetic steel, ferrite, or aluminum nickel cobalt, and the embodiment of the present application does not limit this.

[0083] Reference Figure 3 、 Figure 8 and Figure 17 In the embodiment of the present application, the generator further includes a first sealing assembly 4, which includes a first sealing structure 41 and a second sealing structure 42. The first sealing structure 41 is coated on the surface of the stator assembly 2, and the second sealing structure 42 is coated on the surface of the rotor assembly 3. Along the radial direction of the stator assembly 2, the first sealing structure 41 and the second sealing structure 42 are spaced apart to form an air gap, which is connected to the opening. Here, the first sealing structure 41 and the second sealing structure 42 form independent seals for the stator assembly 2 and the rotor assembly 3, respectively, so that the liquid entering through the first opening 12 can pass through the air gap. On the one hand, when the liquid flows through the air gap, it can directly take away the heat of the stator assembly 2 and the rotor assembly 3, further improving the heat dissipation of the generator; on the other hand, the continuous flow of the liquid can wash away the sediment or microorganisms (such as barnacles and algae) on the surface of the first sealing structure 41 and the second sealing structure 42, reducing the impact of biological fouling on the electromagnetic performance of the generator.

[0084] In the embodiment of the present application, the first sealing structure 41 is coated on the surface of the stator assembly 2 to form a sealing layer on the outside of the stator assembly 2. The structural form of the first sealing structure 41 is possible in various ways. For example, the first sealing structure 41 may include a liquid sealing material. When sealing the stator assembly 2, the stator core 21 and the stator coil 24 of the stator assembly 2 may be immersed in the liquid sealing material (such as epoxy resin, silicone rubber, polyurethane) as a whole, and a fully covered protective layer may be formed after curing. Alternatively, the first sealing structure 41 may include an insulating varnish. When sealing the stator assembly 2, the stator core 21 and the stator coil 24 of the stator assembly 2 may be placed in a vacuum environment, and then the insulating varnish may be injected and pressurized so that the insulating varnish is cured on the surface of the stator assembly 2 to form a sealing layer.

[0085] In the embodiment of the present application, the second sealing structure 42 is coated on the surface of the rotor assembly 3 to form a sealing layer on the outside of the rotor assembly 3. The second sealing structure 42 has various possible structural forms. For example, the second sealing structure 42 may include a liquid sealing material. When sealing the rotor assembly 3, the entire rotor core of the rotor assembly 3 may be immersed in the liquid sealing material (such as epoxy resin, silicone rubber, or polyurethane), which is cured to form a fully encapsulated protective layer. Alternatively, the second sealing structure 42 may include an insulating varnish. When sealing the rotor assembly 3, the rotor core of the rotor assembly 3 may be placed in a vacuum environment, and then the insulating varnish is injected and pressurized to cure the insulating varnish on the surface of the rotor assembly 3 to form a sealing layer.

[0086] In the embodiment of the present application, the first sealing structure 41 and the second sealing structure 42 are spaced apart in the radial direction of the stator assembly 2 to form an air gap. Here, the air gap is the physical gap between the stator assembly 2 and the rotor assembly 3 in the generator. It is an important component of the generator's magnetic circuit and directly affects the generator's electromagnetic performance, mechanical reliability, and heat dissipation efficiency.

[0087] Reference Figure 17 In the embodiment of the present application, the first sealing structure 41 includes a sealing shell 411 and a first sealing member 412. The sealing shell 411 is arranged on the base 1 to enclose a first sealed cavity together with the base 1. The stator assembly 2 is located in the first sealed cavity, and the first sealing member 412 is filled between the stator assembly 2 and the inner wall of the first sealed cavity. In this way, the sealing shell 411, the first sealing member 412 and the base 1 can jointly form a protection for the periphery of the stator assembly 2, simplifying the waterproof sealing structure of the stator assembly 2. In addition, when the generator is working underwater, the stator assembly 2 is in contact with the water through the first sealing structure 41, so that the heat generated by the stator assembly 2 can be conducted to the water through the first sealing structure 41, thereby improving the heat dissipation of the generator.

[0088] In the embodiment of the present application, the first sealing member 412 may be in various forms. For example, the first sealing member 412 may be a potting compound, a silicone rubber, or a sealing filler. The embodiment of the present application does not limit this.

[0089] In the embodiment of the present application, the stator assembly 2 can be assembled on the base 1 by shrink fitting. In the case where the first sealing member 412 is a potting compound, the first sealed cavity enclosed by the sealing shell 411 and the base 1 can constitute a potting space, so that the potting compound can complete the potting of the stator assembly 2.

[0090] In the embodiment of the present application, the structure of the sealed housing 411 has various possibilities. For example, the sealed housing 411 may include multiple arc-shaped mounting shells. Along the axial direction of the stator core 21, the multiple arc-shaped mounting shells are sequentially spliced ​​and enclosed with the base 1 to form a first sealed cavity. Alternatively, refer to Figure 17 The sealed shell 411 may include a first baffle 4111, a second baffle 4112 and an annular pressure plate 4113. The first baffle 4111 and the second baffle 4112 are arranged on the base 1 along the axial direction of the rotor assembly 3. The first baffle 4111 and the second baffle 4112 both have stop steps. The annular pressure plate 4113 is fixed between the first baffle 4111 and the second baffle 4112 through the stop steps to enclose a first sealed cavity.

[0091] It should be noted that when installing the first baffle 4111, the second baffle 4112, and the annular pressure plate 4113, a gap should be reserved between the first and second baffles 4111, 4112 and the stator coils 24 of the stator assembly 2, and a gap should be reserved between the annular pressure plate 4113 and the stator teeth 211 of the stator assembly 2 to ensure a safe discharge distance. Furthermore, the first seal 412 is disposed between the stator assembly 2 and the inner wall of the first sealed cavity; that is, the first seal 412 fills the gap between the stator assembly 2 and the sealed housing 411.

[0092] Reference Figure 16 、 Figure 17 and Figure 18In the embodiment of the present application, the rotor assembly 3 includes a yoke 31 and a permanent magnet 32. The yoke 31 is continuously arranged along the circumference of the rotor assembly 3. The permanent magnet 32 ​​is arranged on the outer side of the yoke 31 along the radial direction of the rotor assembly 3, and multiple permanent magnets 32 are arranged at intervals along the circumference of the rotor assembly 3. The second sealing structure 42 includes a second seal 421. Along the radial direction of the rotor assembly 3, the second seal 421 is coated on the outer side of the yoke 31 and covers the permanent magnet 32 ​​located on the outer side of the yoke 31. Here, the permanent magnet 32 ​​is used to provide an excitation magnetic field, and the yoke 31 serves as a path for magnetic flux, which is used to efficiently transfer the magnetic field generated by the permanent magnet 32 ​​to the air gap. At the same time, the yoke 31 also serves as a structural support for the permanent magnet 32 ​​and is used to fix the permanent magnet 32. The second seal 421 is wrapped around the outer side surface of the yoke 31 and covers the permanent magnet 32 ​​located on the outer side surface of the yoke 31. On the one hand, it can fill the gap between the permanent magnet 32 ​​and the yoke 31 to form a gap-free sealing layer, thereby achieving a better sealing effect; on the other hand, the second seal 421 can increase the bonding force between the permanent magnet 32 ​​and the yoke 31, thereby reducing the displacement or falling off of the permanent magnet 32 ​​due to centrifugal force, thereby improving the structural reliability of the rotor assembly 3.

[0093] In the embodiment of the present application, the second sealing member 421 may be in various forms. For example, the second sealing member 421 may be a potting compound or a silicone rubber, which is not limited in the embodiment of the present application.

[0094] In the embodiment of the present application, when the second sealing member 421 is a potting glue, the first sealing member 412 can be an epoxy resin potting glue, a polyurethane potting glue, or a silicone potting glue. In addition, when the second sealing member 421 is provided, a potting mold 9 can be used to enclose a potting space on the outer side of the yoke 31. The potting mold 9 has a glue injection hole 921 for injecting the second sealing member 421. Specifically, refer to Figure 14 The potting mold 9 includes a potting body 91 and a potting cover plate 92. Along the axial direction of the rotor assembly 3, the potting body 91 and the potting cover plate 92 are respectively fixed to opposite sides of the yoke 31 to form a potting space together with the outer surface of the yoke 31. The glue injection hole 921 is set on the potting cover plate 92.

[0095] In the embodiment of the present application, the second sealing structure 42 also includes a moisture-proof coating, which covers the remaining side surfaces of the yoke 31, that is, all surfaces except the outer side surface of the yoke 31. This, on the one hand, allows for a thinner moisture-proof coating, which has less impact on the continuity of the magnetic circuit of the yoke 31; on the other hand, the processing of the moisture-proof coating is simple, which can reduce costs.

[0096] Reference Figure 2 、 Figure 4 and Figure 5In the embodiment of the present application, the base 1 includes a bearing assembly 13 and a rotating shaft 14. The bearing assembly 13 includes a bearing mounting structure 131 and a bearing 132. The bearing mounting structure 131 has a bearing mounting cavity 13111 and a shaft hole 13121 communicating with the bearing mounting cavity 13111. The bearing 132 is mounted in the bearing mounting cavity 13111. The rotating shaft 14 is connected to the bearing 132 via the shaft hole 13121. The rotor assembly 3 is rotatably disposed inside the stator assembly 2 via the rotating shaft 14. The generator further includes a second sealing assembly 5 disposed between the rotating shaft 14 and the shaft hole 13121. The second sealing assembly 5 includes a third sealing structure 51 and a fourth sealing structure 52. The third sealing structure 51 and the fourth sealing structure 52 are spaced apart along the axial direction of the rotating shaft 14. Here, the rotor assembly 3 is rotatably connected to the bearing assembly 13 of the base 1 via the rotating shaft 14, allowing the rotor assembly 3 to rotate relative to the base 1. The bearing mounting structure 131 includes a bearing mounting cavity 13111 and an axial hole 13121 communicating with the bearing mounting cavity 13111. A bearing 132 is mounted in the bearing mounting cavity 13111. The rotating shaft 14 is connected to the bearing 132 via the axial hole 13121. The generator also includes a second sealing assembly 5 disposed between the rotating shaft 14 and the axial hole 13121. Bearing 132 in the bearing mounting cavity 13111 supports the rotating shaft 14 and reduces friction and wear between the rotating shaft 14 and the base 1. The second sealing assembly 5 is disposed between the rotating shaft 14 and the shaft hole 13121 and can seal the bearing 132 in the bearing mounting cavity 13111. On the one hand, it can prevent liquid from invading the bearing mounting cavity 13111 through the gap between the rotating shaft 14 and the shaft hole 13121, causing corrosion of the bearing 132. It can also prevent liquid from washing away the grease or oil of the bearing 132, causing dry friction. On the other hand, it can prevent mud and microorganisms (such as barnacle larvae) in the water from entering the bearing mounting cavity 13111 through the gap between the rotating shaft 14 and the shaft hole 13121, accelerating the raceway wear of the bearing 132. The second sealing assembly 5 includes a third sealing structure 51 and a fourth sealing structure 52. The third sealing structure 51 and the fourth sealing structure 52 are spaced apart along the axial direction of the rotating shaft 14. Here, the third sealing structure 51 and the fourth sealing structure 52 together form a segmented sealing protection. As they approach the bearing mounting cavity 13111, the liquid pressure on the corresponding sealing structure gradually decreases, thereby improving the pressure resistance of the second sealing assembly 5. After testing, the protective structure formed by the third sealing structure 51 and the fourth sealing structure 52 can meet the requirement of withstanding pressure at a water depth of more than 30m.

[0097] Reference Figure 7In the embodiment of the present application, to extend the service life of the rotating shaft 14, a wear-resistant layer 15 (such as a hard chrome layer, a ceramic coating, etc.) may be provided at the interface between the rotating shaft 14 and the shaft hole 13121. Furthermore, the surface Rockwell hardness of the wear-resistant layer 15 may be greater than or equal to 45, and the thickness of the wear-resistant layer 15 may be greater than or equal to 0.3 mm. Alternatively, a wear-resistant sleeve may be provided at the interface between the rotating shaft 14 and the shaft hole 13121, although this embodiment of the present application does not impose any limitation thereto.

[0098] In the embodiment of the present application, in order to reduce the friction coefficient between the second sealing assembly 5 and the rotating shaft 14, an oil filling hole can be provided between the second sealing assembly 5 and the rotating shaft 14 for injecting lubricant.

[0099] In the embodiment of the present application, the structural form of the bearing mounting structure 131 has various possibilities. For example, the bearing mounting structure 131 may include a bearing seat, which may be an integrated structure, and the bearing 132 mounting seat has a bearing mounting cavity 13111 and an axial hole 13121. Figure 4 and Figure 5 In another possible embodiment of the present application, the bearing mounting structure 131 includes a first seat body 1311 and a second seat body 1312. The first seat body 1311 has a bearing mounting cavity 13111. Along the axial direction of the rotating shaft 14, the bearing mounting cavity 13111 has a second opening 13112. The second seat body 1312 has an axial hole 13121. The second seat body 1312 is disposed in the second opening 13112 so that the axial hole 13121 communicates with the bearing mounting cavity 13111. Here, the bearing mounting structure 131 includes the first seat body 1311 and the second seat body 1312. That is, the bearing mounting structure 131 is a split structure. The bearing 132 is mounted in the bearing mounting cavity 13111 of the first seat body 1311, and the third sealing structure 51 and the fourth sealing structure 52 are mounted in the axial hole 13121 of the second seat body 1312. During assembly, the bearing 132 and the second sealing assembly 5 can be assembled independently, which helps improve the assembly efficiency of the generator. During assembly and disassembly, due to the detachable design of the first seat body 1311 and the second seat body 1312 , the bearing 132 and the second sealing assembly 5 can be assembled and disassembled separately, thereby improving the convenience of generator maintenance.

[0100] Reference Figure 4 and Figure 5In this embodiment of the present application, a flange 13122 can be provided on the inner wall of the shaft hole 13121 of the second base body 1312 to separate the shaft hole 13121 into a first section and a second section along the axial direction of the rotating shaft 14. The third sealing structure 51 and the fourth sealing structure 52 are respectively disposed in the first section and the second section. Here, the flange 13122 divides the inner cavity of the shaft hole 13121 into two independent sections, the first section and the second section. The third sealing structure 51 and the fourth sealing structure 52 are arranged in different sections to form a series sealing line of defense. If the sealing structure in one section fails, the sealing structure in the other section can still intercept the medium, thereby improving the sealing performance of the generator.

[0101] Reference Figure 4 and Figure 5 In the embodiment of the present application, in order to improve the sealing effect of the bearing mounting cavity 13111 , a first sealing ring 135 and a second sealing ring 136 are provided between the first seat body 1311 and the second seat body 1312 .

[0102] In the embodiment of the present application, the opening of the shaft hole 13121 of the second seat body 1312 may be chamfered to prevent the third sealing structure 51 and the fourth sealing structure 52 from being scratched by sharp edges when installed in the shaft hole 13121, thereby affecting the sealing performance of the third sealing structure 51 and the fourth sealing structure 52. In addition, if the rotating shaft 14 is a stepped shaft, the shoulder of the rotating shaft 14 may also be chamfered to prevent damage to the third sealing structure 51 and the fourth sealing structure 52 when mating with the rotating shaft 14.

[0103] In the embodiment of the present application, the bearing mounting structure 131 further includes a first sealing cover 133 having a mounting hole for the rotating shaft 14 to pass through. The first sealing cover 133 is disposed at the end of the shaft hole 13121 facing away from the first seat body 1311. The first sealing cover 133 is disposed at the end of the shaft hole 13121 facing away from the first seat body 1311 to prevent dust, sediment, and the like from entering the shaft hole 13121, thereby reducing the probability of wear and failure of the bearing 132 and the second sealing assembly 5.

[0104] Reference Figure 4 and Figure 5 In this embodiment of the present application, a third sealing ring 137 is disposed between the first sealing cover 133 and the end surface of the shaft hole 13121. Thus, along the axial direction of the stator assembly 2, the third sealing ring 137 forms a static seal structure, and the second sealing assembly 5 forms a dynamic seal structure, further enhancing the sealing effect on the bearing mounting cavity 13111.

[0105] Reference Figure 4 and Figure 5In this embodiment of the present application, the bearing mounting cavity 13111 further comprises a third opening 13113. This is located on the side of the bearing mounting cavity 13111 facing away from the second opening 13112 along the axial direction of the rotating shaft 14. The bearing mounting structure 131 further comprises a second sealing cover 134 disposed at the third opening 13113. This allows access to the bearing mounting cavity 13111 by simply opening the second sealing cover 134, avoiding the need to disassemble the rotating shaft 14 and improving the maintainability of the generator.

[0106] In the embodiment of the present application, the side of the second sealing cover 134 facing away from the first base 1311 can be a flat surface or an arcuate surface, which is not limited in the embodiment of the present application. Figure 5 In one possible embodiment of the present application, the side of the second sealing cover 134 facing away from the first base 1311 is a tapered surface. This can reduce the flow resistance of the liquid and the vortex phenomenon formed when the liquid flows through this area, thereby helping to stabilize the flow field and play a certain role in converging.

[0107] Reference Figure 4 and Figure 5 In the embodiment of the present application, in order to improve the sealing effect of the bearing mounting cavity 13111 , a fourth sealing ring 138 and a fifth sealing ring 139 are provided between the second sealing cover 134 and the first seat body 1311 .

[0108] Reference Figure 4 and Figure 5 In one possible embodiment of the present application, the third sealing structure 51 includes a first skeleton oil seal 511 and a second skeleton oil seal 512. Along the axial direction of the rotating shaft 14, the sealing lips of the first skeleton oil seal 511 and the sealing lips of the second skeleton oil seal 512 are arranged in opposite directions. In this way, the first skeleton oil seal 511 and the second skeleton oil seal 512 can form a bidirectional seal along the axial direction of the rotating shaft 14, preventing the lubricating oil in the bearing mounting cavity 13111 from leaking and blocking external contaminants from invading the bearing mounting cavity 13111. At the same time, this design can balance pressure distribution, reduce wear on the sealing lips on one side, and adapt to the forward and reverse rotation, vibration, and eccentricity of the rotating shaft 14, significantly improving the reliability and lifespan of the third sealing structure 51.

[0109] In the embodiment of the present application, the structural form of the fourth sealing structure 52 may be various. For example, the fourth sealing structure 52 may include an O-ring, a lip-shaped oil seal ring, or a magnetic fluid sealing structure. The embodiment of the present application does not limit this.

[0110] Reference Figure 4 and Figure 5In a possible embodiment of the present application, the fourth sealing structure 52 is arranged on the side of the third sealing structure 51 facing away from the bearing 132. The fourth sealing structure 52 includes a lip seal ring 521, and the sealing lip of the lip seal ring 521 extends toward the side facing away from the third sealing structure 51. Here, the fourth sealing structure 52 is arranged on the side of the third sealing structure 51 facing away from the bearing 132, and the sealing lip of the lip seal ring 521 extends toward the side facing away from the third sealing structure 51. On the one hand, it can share the pressure on the side of the third sealing structure 51 facing away from the bearing 132, so that the pressure gradient along the axial direction of the shaft hole 13121 is smoothed, reducing the risk of sealing failure of the second sealing assembly 5; on the other hand, the cavity between the third sealing structure 51 and the fourth sealing structure 52 can retain part of the medium, forming a buffer area, balancing the internal and external pressure difference, and reducing instantaneous high-pressure shock.

[0111] In the embodiment of the present application, there are many possibilities for the number of sealing lips on the lip-shaped sealing ring 521. For example, the number of sealing lips on the lip-shaped sealing ring 521 can be one or two, and the embodiment of the present application does not limit this.

[0112] In the embodiment of the present application, the material of the lip seal ring 521 can be various. For example, the material of the lip seal ring 521 can be nitrile rubber, silicone rubber, or polytetrafluoroethylene, which is not limited in the embodiment of the present application. In one possible embodiment of the present application, the material of the lip seal ring 521 can be polyurethane. In this way, the lip seal ring 521 can have a water lubrication effect, so that a fluid lubrication layer can be formed between the sealing lip of the lip seal ring 521 and the rotating shaft 14, which helps to reduce the friction coefficient between the lip seal ring 521 and the rotating shaft 14.

[0113] It should be noted that, in the embodiment of the present application, a thermoplastic material can be selected when selecting the material of the lip seal ring 521. In this way, the lip seal ring 521 can be installed on the rotating shaft 14 by welding, which is fast and convenient to install.

[0114] In this embodiment of the present application, at least two lip seals 521 are spaced apart along the axial direction of the rotating shaft 14. Thus, the at least two lip seals 521 can form at least two independent sealing lines along the axial direction of the rotating shaft 14, providing multi-layered protection against high-pressure liquids and enhancing the sealing effectiveness of the fourth sealing structure 52.

[0115] In the embodiment of the present application, when at least two lip seal rings 521 are provided at intervals, refer to Figure 4 and Figure 5 , two or four lip sealing rings 521 can be provided, and this embodiment of the present application does not limit this.

[0116] In the embodiments of this application, the generator can be submerged in seawater during use. However, seawater itself is a naturally strong electrolyte and is highly corrosive. Furthermore, tidal currents and waves generate low-frequency reciprocating stress and impact on metal components. Furthermore, marine microorganisms, attached organisms, and their metabolic products can directly or indirectly accelerate the corrosion process of metal components. Therefore, if the generator is immersed in a marine environment for a long time, it will face very serious corrosion.

[0117] Reference Figure 15 In the embodiment of the present application, to improve the corrosion resistance of the generator, the surface of the generator can be coated with an anti-corrosion and anti-fouling coating structure 8. Here, the anti-corrosion and anti-fouling coating structure 8 can include a multi-layer structure. From the inside to the outside, the multi-layer structure can be, in order, an anti-rust primer layer 81, an intermediate connecting paint layer 82, and an anti-fouling layer 83. The anti-rust primer layer 81 and the intermediate connecting paint layer 82 can be epoxy paint, and the anti-fouling layer 83 can be a high-performance self-polishing anti-fouling paint, which is not limited in this embodiment of the present application.

[0118] In the embodiment of the present application, there are many possibilities for designing the thickness of the anti-corrosion and anti-fouling coating structure 8. For example, the thickness of the anti-rust primer layer 81 can range from 100 to 160 μm; the thickness of the intermediate connecting paint layer 82 can range from 50 to 80 μm; and the thickness of the anti-fouling paint layer can range from 200 to 300 μm. This embodiment of the present application does not impose any restrictions on this.

[0119] Reference Figure 16 、 Figure 17 、 Figure 18 and Figure 19 In an embodiment of the present application, the stator assembly 2 may include a stator core 21 and a limiting structure 22. The stator core 21 includes a stator yoke 212 and a stator tooth 211. The stator yoke 212 includes a plurality of yoke segments 2121. The plurality of yoke segments 2121 are sequentially connected along the circumference of the stator core 21 to jointly form the stator yoke 212. A plurality of stator teeth 211 are provided, and the stator teeth 211 are separately connected to the yoke segments 2121. The limiting structure 22 includes a first limiting member 221 and a second limiting member 222. Along the axial direction of the stator core 21, the first limiting member 221 and the second limiting member 222 are respectively provided on opposite sides of the stator core 21 to respectively fit tightly with the corresponding sides of the stator tooth 211.

[0120] In the embodiment of the present application, the stator yoke 212 is the outer annular portion of the stator core 21. Its function is to connect the roots of the stator teeth 211 to form a closed magnetic circuit. The stator yoke 212 includes multiple yoke segments 2121. This means that the stator yoke 212 is divided into multiple independent arc-shaped units. The multiple yoke segments 2121 can be spliced ​​together along the circumference of the stator core 21 to form the annular stator yoke 212.

[0121] In the embodiment of the present application, there are many possible ways to connect adjacent yoke segments 2121. For example, adjacent yoke segments 2121 can be connected by non-detachable methods such as gluing and welding, or by detachable methods such as bolt connection and clamping. The embodiment of the present application does not limit this.

[0122] In the embodiment of the present application, the stator teeth 211 are portions of the stator core 21 that protrude inwardly. Along the circumference of the stator core 21 , core slots for accommodating the stator coils 24 may be formed between two adjacent stator teeth 211 .

[0123] In the embodiment of the present application, there are many possible ways to connect the stator tooth portion 211 and the yoke segment 2121. For example, the stator tooth portion 211 and the yoke segment 2121 can be connected by non-detachable means such as gluing and welding, or by detachable means such as flange connection and plug-in. This embodiment of the present application does not limit this.

[0124] In the embodiment of the present application, the function of the first limiter 221 and the second limiter 222 is to limit the position of the stator tooth portion 211 along the axial direction of the stator core 21. Therefore, the structural design of the first limiter 221 and the second limiter 222 has many possibilities. For example, the first limiter 221 and the second limiter 222 can be a plate-like structure, a rod-like structure, or a frame structure. The embodiment of the present application does not limit this.

[0125] In the embodiment of the present application, since the stator teeth 211 and the yoke segments 2121 are of split design, the stator teeth 211 and the yoke segments 2121 can be punched using a single tooth mold and a single yoke mold. During punching, the silicon steel sheet can be slightly larger than the size of a single stator tooth 211 or a single stator yoke 212, or the stator teeth 211 can be arranged on a larger silicon steel sheet to reduce the waste of punching materials. After the stator teeth 211 and the yoke segments 2121 are punched, they can be stacked and bonded according to the iron length (axial height of the stator core 21) and the stacking coefficient.

[0126] In the technical solution provided in the embodiment of the present application, the stator assembly 2 includes a stator core 21 and a limiting structure 22, wherein the stator core 21 includes a stator yoke 212 and a stator tooth 211. The stator yoke 212 includes a plurality of yoke segments 2121, which are sequentially connected along the circumference of the stator core 21 to form the stator yoke 212. The stator tooth 211 is provided in plurality, and the stator tooth 211 is separately connected to the yoke segments 2121. Here, the stator yoke 212 includes a plurality of yoke segments 2121. The design of multiple yoke segments 2121 can reduce the difficulty of machining the stator yoke 212, especially when the stator yoke 212 is large in size, and can also reduce the difficulty of transporting the stator yoke 212. The stator tooth 211 is provided in plurality, and the stator tooth 211 is separately connected to the yoke segments 2121. In this way, the stator teeth 211 and the yoke segments 2121 can be made using different processing techniques during production. For example, the stator teeth 211 can be made using laser cutting or wire cutting, and the yoke segments 2121 can be made using stamping. This avoids the problem of mold wear caused by core slot processing during integral punching, thereby improving the production efficiency of the stator assembly 2. In addition, the stator teeth 211 and the yoke segments 2121 can also be made of different materials as needed. For example, the stator teeth 211 can be made of silicon steel sheets with high magnetic permeability and low iron loss, and the yoke segments 2121 can be made of low-cost silicon steel or composite materials, thereby reducing the material cost of the stator assembly 2. In addition, in the event that the stator teeth 211 are damaged, the damaged stator teeth 211 can be replaced individually, thereby improving the convenience of maintaining the stator teeth 211. The limiting structure 22 includes a first limiting member 221 and a second limiting member 222. The first limiting member 221 and the second limiting member 222 are respectively disposed on opposite sides of the stator core 21 along the axial direction of the stator core 21, so as to tightly engage with the corresponding sides of the stator teeth 211. The first limiting member 221 and the second limiting member 222 can limit the position of the stator teeth 211 to prevent relative movement between the stator teeth 211 and the stator yoke 212 along the axial direction of the stator core 21, thereby improving the structural reliability of the stator assembly 2.

[0127] It should be noted that when the stator tooth 211 is connected to the yoke segment 2121, air gaps or seams should be eliminated as much as possible to avoid leakage of magnetic flux at the junction of the stator tooth 211 and the yoke segment 2121 due to sudden changes in magnetic resistance, ensuring the continuity of the magnetic circuit and thus improving the utilization rate of the magnetic field.

[0128] Reference Figure 16 、 Figure 17 and Figure 18In the embodiment of the present application, a first splicing surface 213 is formed between two adjacent yoke segments 2121, and a second splicing surface 214 is formed between the stator teeth 211 and the yoke segments 2121. The first splicing surface 213 and the second splicing surface 214 are spaced apart along the circumference of the stator core 21. The spacing between the first splicing surface 213 and the second splicing surface 214 restructures the stress transfer path, transforming concentrated loads into distributed loads, improving stress distribution within the stator core 21, and further enhancing the structural reliability of the stator assembly 2.

[0129] In another possible embodiment of the present application, the first splicing surface 213 and the second splicing surface 214 may also be continuously arranged along the circumference of the stator core 21 , and this embodiment of the present application does not limit this.

[0130] In the embodiment of the present application, along the axial direction of the stator core 21, the first stopper 221 at least partially covers the first splicing surface 213 and the second splicing surface 214; and / or, along the axial direction of the stator core 21, the second stopper 222 at least partially covers the first splicing surface 213 and the second splicing surface 214. In this way, when the first stopper 221 at least partially covers the first splicing surface 213 and the second splicing surface 214 along the axial direction of the stator core 21, the preload force of the first stopper 221 on the stator core 21 will form an orthogonal vector superposition with the contact stress at the first splicing surface 213 and the second splicing surface 214, so that the maximum shear stress position on the stator assembly 2 can be shifted into the first stopper 221, further improving the stress distribution inside the stator core 21. Similarly, when the second limiter 222 at least partially covers the first splicing surface 213 and the second splicing surface 214 along the axial direction of the stator core 21, the pre-tightening force of the second limiter 222 on the stator core 21 will form an orthogonal vector superposition with the contact stress at the first splicing surface 213 and the second splicing surface 214, so that the position of the maximum shear stress on the stator assembly 2 can be transferred to the inside of the second limiter 222, further improving the stress distribution inside the stator core 21.

[0131] In the embodiment of the present application, the first stopper 221 can partially cover the first splicing surface 213 and the second splicing surface 214 along the axial direction of the stator core 21, or can completely cover the first splicing surface 213 and the second splicing surface 214 along the axial direction of the stator core 21, and this embodiment of the present application does not limit this. The second stopper 222 can partially cover the first splicing surface 213 and the second splicing surface 214 along the axial direction of the stator core 21, or can completely cover the first splicing surface 213 and the second splicing surface 214 along the axial direction of the stator core 21, and this embodiment of the present application does not limit this.

[0132] In the embodiment of the present application, the first limiting member 221 and the second limiting member 222 can both at least partially cover the first splicing surface 213 and the second splicing surface 214 along the axial direction of the stator core 21; or, only the first limiting member 221 can at least partially cover the first splicing surface 213 and the second splicing surface 214 along the axial direction of the stator core 21; or, only the second limiting member 222 can at least partially cover the first splicing surface 213 and the second splicing surface 214 along the axial direction of the stator core 21. This embodiment of the present application does not limit this.

[0133] In the embodiment of the present application, the first limiting member 221 and the second limiting member 222 can be connected to the stator core 21 by welding, bonding, etc. Figure 16 、 Figure 17 and Figure 18 In another possible embodiment of the present application, the stator assembly 2 further includes a fixing structure 23, and the first and second limiting members 221, 222 are detachably connected to the stator core 21 via the fixing structure 23. In this way, when maintaining the stator core 21, the first and second limiting members 221, 222 can be detached from the stator core 21, further improving the convenience of maintaining the stator core 21.

[0134] In the embodiment of the present application, the structural form of the fixing structure 23 is possible in many ways. For example, the fixing structure 23 may include a clip and a slot adapted to the clip. The clip is respectively arranged on the first limiting member 221 and the second limiting member 222, and the slot is arranged on the opposite sides of the stator core 21 along the axial direction of the stator core 21. The first limiting member 221 and the second limiting member 222 are respectively engaged with the slots on the corresponding sides of the stator core 21.

[0135] Reference Figure 16 、 Figure 17 and Figure 18 In a possible embodiment of the present application, the fixing structure 23 includes a fastener 231, the first stopper 221 has a first fixing hole, the stator core 21 has a second fixing hole, and the second stopper 222 has a third fixing hole. Along the axial direction of the stator core 21, the fastener 231 sequentially passes through the first fixing hole, the second fixing hole, and the third fixing hole to fix the first stopper 221 and the second stopper 222 to opposite sides of the stator core 21. In this way, after the stator teeth 211 and the stator yoke 212 are assembled, the first stopper 221 and the second stopper 222 can be placed on corresponding sides of the stator core 21 so that the first fixing hole, the second fixing hole, and the third fixing hole are aligned along the axial direction of the stator core 21. Then, the fastener 231 is sequentially passed through the first fixing hole, the second fixing hole, and the third fixing hole to complete the fixation of the first stopper 221 and the second stopper 222.

[0136] In the embodiment of the present application, there are many possible shape designs for the first limiter 221 and the second limiter 222. For example, the first limiter 221 and the second limiter 222 can be regular shapes such as arcs, rectangles, etc., or regular shapes. The embodiment of the present application does not limit this.

[0137] In a possible embodiment of the present application, the first limiting member 221 is continuously arranged along the circumference of the stator core 21; and / or the second limiting member 222 is continuously arranged along the circumference of the stator core 21. Here, the first limiting member 221 is continuously arranged along the circumference of the stator core 21, that is, the shape of the first limiting member 221 is annular, so that the first limiting member 221 can simultaneously limit multiple stator teeth 211, reducing the number of first limiting members 221 set, thereby improving the production efficiency of the stator assembly 2. Similarly, the second limiting member 222 is continuously arranged along the circumference of the stator core 21, that is, the shape of the second limiting member 222 is annular, so that the second limiting member 222 can simultaneously limit multiple stator teeth 211, reducing the number of second limiting members 222 set, and also improving the production efficiency of the stator assembly 2.

[0138] In the embodiment of the present application, the first limiting member 221 and the second limiting member 222 can both be continuously arranged along the circumference of the stator core 21; or, only the first limiting member 221 is continuously arranged along the circumference of the stator core 21; or, only the second limiting member 222 is continuously arranged along the circumference of the stator core 21, and the embodiment of the present application does not limit this.

[0139] Reference Figure 16 、 Figure 17 and Figure 18 In the embodiment of the present application, one of the yoke segment 2121 and the stator tooth 211 has a first mounting slot 21211, and the other of the yoke segment 2121 and the stator tooth 211 has a first protrusion 2111 that engages with the first mounting slot 21211, thereby separately connecting the stator tooth 211 to the yoke segment 2121. This allows the stator tooth 211 to be connected to the yoke segment 2121 via a snap-fit ​​connection, making the operation more convenient and improving the production efficiency of the stator assembly 2.

[0140] In the present application, refer to Figure 16 、 Figure 17 and Figure 18 The first mounting groove 21211 can be set on the yoke section 2121, and the first protrusion 2111 can be set on the stator tooth portion 211; or, the first mounting groove 21211 can be set on the stator tooth portion 211, and the first protrusion 2111 can be set on the yoke section 2121, and this embodiment of the application is not limited to this.

[0141] In addition, it should be noted that the shape of the first mounting groove 21211 may be various. For example, the shape of the first mounting groove 21211 may be trapezoidal or dovetail-shaped, and this embodiment of the present application does not limit this.

[0142] In the embodiment of the present application, the stator assembly 2 further includes a stator coil 24 that is sleeved onto the stator tooth 211. The stator tooth 211 has a first protrusion 2111. The size of the first protrusion 2111 is smaller than the size of the stator coil 24, so that the stator coil 24 can be sleeved onto the stator tooth 211 via the first protrusion 2111. The side of the stator tooth 211 facing away from the first protrusion 2111 has a limiting protrusion 2112 for tightly fitting with the stator coil 24. In this way, the stator coil 24 can first be separately wound and formed using a winding machine and a winding die. Then, the stator coil 24 can be sleeved onto the stator tooth 211 via the first protrusion 2111. The stator tooth 211 is then connected to the yoke section 2121. The limiting protrusion 2112 on the stator tooth 211 tightly fits with the stator coil 24 to prevent the stator coil 24 from falling off the stator tooth 211. This avoids the complex operation of traditional wire embedding, thereby improving the production efficiency of the stator assembly 2. In addition, when a single stator coil 24 is damaged, only the stator coil 24 corresponding to the stator tooth 211 needs to be replaced without disassembling the entire stator winding, significantly reducing maintenance costs and time.

[0143] Reference Figure 16 、 Figure 17 and Figure 18 In this embodiment of the present application, the stator assembly 2 may further include slot wedges 26, which are used to be inserted into the notches of the core slots to secure the stator coils 24. In this way, the stator coils 24 can be better filled in the core slots under the force of the slot wedges 26, thereby improving the electrode slot fill rate of the stator assembly 2. It should be noted that the electrode slot fill rate is used to describe the percentage of the cross-sectional area occupied by the conductive material (such as the stator coils 24) in the core slots, reflecting the efficiency of space utilization within the core slots.

[0144] In addition, refer to Figure 16 、 Figure 17 and Figure 18 In this embodiment of the present application, the stator assembly 2 may further include an insulating cardboard sheet 25. Thus, before the stator coil 24 is inserted into the stator tooth 211, a layer of insulating cardboard sheet 25 may be wrapped around the stator coil 24. After the stator tooth 211 assembly and the yoke segment 2121 are assembled, the corresponding sides of the insulating cardboard sheet 25 may be respectively attached to the stator tooth 211, the stator yoke 212, the slot wedge 26, and the adjacent stator coil 24, thereby isolating the stator coil 24 from the stator core 21.

[0145] In the embodiment of the present application, a single yoke segment 2121 may have multiple first mounting slots 21211, so that a single yoke segment 2121 can be connected to multiple stator teeth 211. This can reduce the number of yoke segments 2121, thereby reducing the accumulated errors when the yoke segments 2121 are spliced ​​together to form the stator yoke 212, and thus improve the coaxiality of the stator yoke 212.

[0146] In the embodiment of the present application, along the circumference of the stator core 21, one end of the yoke segment 2121 has a second mounting slot 21213, and the other end has a second protrusion 21212 that fits and engages with the second mounting slot 21213. Thus, referring to the figure, adjacent yoke segments 2121 can be connected by the second protrusion 21212 and the second mounting slot 21213, which facilitates operation and improves the production efficiency of the stator assembly 2.

[0147] It should be noted that the shape of the second mounting groove 21213 may be various. For example, the shape of the second mounting groove 21213 may be trapezoidal or dovetail-shaped, and this embodiment of the present application does not limit this.

[0148] The serial numbers of the embodiments of this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. The above are only preferred embodiments of this application and do not limit the scope of the patent of this application. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the scope of patent protection of this application.

Claims

1. A generator, characterized in that: include: A machine base, wherein the machine base has a mounting cavity therein, and opposite sides of the mounting cavity have first openings communicating with the outside world; a stator assembly, wherein the stator assembly is fixed in the mounting cavity, and the axial direction of the stator assembly is parallel to the arrangement direction of the first openings on the mounting cavity; an impeller, which is rotatably arranged on the inner side of the stator assembly along the radial direction of the stator assembly, and the impeller and the stator assembly are coaxially arranged; The rotor assembly is arranged around the impeller along the circumference of the stator assembly and connected to the impeller on the inner side thereof along the radial direction of the stator assembly so as to make the rotor assembly rotate synchronously with the impeller.

2. The generator according to claim 1, characterized in that The stator assembly includes a stator core, which includes a stator yoke and a stator tooth portion connected to the stator yoke. Along the radial direction of the stator assembly, an auxiliary slot is provided on the side of the stator tooth portion facing away from the stator yoke portion to reduce the cogging torque of the generator.

3. The generator according to claim 2, characterized in that The cross section of the auxiliary groove is rectangular.

4. The generator according to claim 2, characterized in that Along the circumference of the stator assembly, at least two auxiliary slots are arranged on the stator tooth portion at intervals, and at least two of the auxiliary slots are symmetrically arranged about the center line of the stator tooth portion.

5. The generator according to claim 1, characterized in that The stator assembly includes a stator core and a stator coil, the stator core has a core slot for accommodating the stator coil, the rotor assembly includes a yoke and a permanent magnet fixed on the yoke, the number of magnetic poles of the permanent magnet is greater than the number of the core slots, and the difference between the two is less than the target threshold.

6. The generator according to claim 5, characterized in that The ratio of the number of the core slots to the product of the number of phases of the generator and the number of poles of the permanent magnet is a fraction.

7. The generator according to claim 5, characterized in that The stator core includes a stator yoke and stator teeth separately connected to the stator yoke. Along the circumference of the stator assembly, a plurality of stator teeth are arranged at intervals, and the core slots are formed between adjacent stator teeth. The number of the stator coils is the same as the number of the stator teeth, so as to correspond one-to-one with the stator teeth.

8. The generator according to any one of claims 1 to 7, characterized in that: The base further includes a flow guide cover installed at the first opening, and the radial size of the flow guide cover gradually increases in a direction away from the first opening.

9. The generator according to any one of claims 1 to 7, characterized in that: The rotor assembly includes a yoke, a permanent magnet and a pressure strip. Along the radial direction of the rotor assembly, the pressure strip is arranged on the outer side of the yoke, and multiple pressure strips are arranged at intervals along the circumference of the rotor assembly so that a slot for inserting the permanent magnet is formed between two adjacent pressure strips.

10. The generator according to any one of claims 1 to 7, characterized in that: The generator also includes a first sealing assembly, which includes a first sealing structure and a second sealing structure. The first sealing structure is covered on the surface of the stator assembly, and the second sealing structure is covered on the surface of the rotor assembly. Along the radial direction of the stator assembly, the first sealing structure and the second sealing structure are spaced apart to form an air gap, and the air gap is connected to the first opening.

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