Rotor assembly and generator

Abstract

According to the rotor assembly and the generator, the end portion of a rotor winding can be restrained from the inner side and the outer side through a supporting ring and an end hoop, the stability of the end portion of the rotor winding when a rotor rotates is guaranteed, the supporting ring with centrifugal fan blades is fixed outside a rotating shaft, and meanwhile the end hoop and the centrifugal fan blades are arranged in a staggered mode in the axial direction of the rotating shaft; the exposed part, not covered by the end hoop, of the end part of the rotor winding corresponds to the centrifugal fan blade in the radial direction, so that on one hand, when the rotor rotates, airflow with a relatively high tangential speed on the surface of the exposed part of the end part of the rotor winding generates convection heat exchange with air, and on the other hand, the supporting ring rotates along with the rotor when the rotor rotates; the centrifugal fan blades extrude air to form radial airflow which passes through the exposed part of the end part of the rotor winding, so that heat convection is further enhanced, the temperature of the exposed part is reduced, the heat conduction path of the rest part of the end part is shortened, the overall heat dissipation efficiency is improved, the power density of the generator can be further improved, and the cost of the generator is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of power generation equipment, and in particular to a rotor assembly and a generator. Background Art

[0002] MW-class doubly-fed induction generators (DFIGs) are rated at megawatts (MW) and are primarily used in large wind power generation systems. The power density of DFIGs is often limited by the temperature rise of the rotor winding ends.

[0003] Usually, glass fiber / carbon fiber end hoops are used to completely wrap the rotor winding ends extending out of the rotor core in the axial direction. This structure will result in low convective heat transfer efficiency at the rotor winding ends, and even heat will be transferred to the joint edge of the rotor core and the rotor winding ends by heat conduction alone, making the rotor winding ends unable to be effectively cooled and causing high temperature rise, which limits the power output of the generator, has low functional density, and high unit power generator cost. Utility Model Content

[0004] The purpose of this application is to provide a rotor assembly and a generator, which improve the heat dissipation efficiency, reduce the temperature rise of the rotor winding end, further improve the power density of the generator, and reduce the cost of the generator.

[0005] The embodiments of the present application can be implemented as follows:

[0006] In a first aspect, the present invention provides a rotor assembly comprising a rotor, an end hoop and a support ring;

[0007] The rotor includes a rotating shaft, a rotor core fixed to the rotating shaft, and a rotor winding wound around the rotor core, wherein an end of the rotor winding extends out of the rotor core along the axial direction of the rotating shaft;

[0008] The end hoop is fixed outside the end of the rotor winding;

[0009] The support ring is fixed outside the rotating shaft, and the outer periphery of the support ring corresponds to the end of the rotor winding; wherein the support ring has a plurality of centrifugal blades distributed at circumferential intervals, and the centrifugal blades and the end hoop are staggered in the axial direction of the rotating shaft.

[0010] In an optional embodiment, two or more end hoops are fixed outside the end of the rotor winding, and a preset gap is left between two adjacent end hoops, and the preset gap corresponds to the radial direction of the centrifugal fan blades of the rotating shaft.

[0011] In an optional embodiment, the support ring includes a mounting plate and a ring body connected to the outer periphery of the mounting plate, the mounting plate is mounted outside the rotating shaft, the ring body corresponds to the end of the rotor winding, and the centrifugal blades are connected between the ring body and the mounting plate, wherein the ring body has an escape space, and the centrifugal blades, the escape space and the preset gap correspond to each other in the radial direction of the rotating shaft.

[0012] In an optional embodiment, one end of the ring body is connected to the mounting plate, and a penetrating strip hole is provided on the peripheral wall of the ring body. The strip hole extends along the circumference of the ring body. The strip hole serves as the avoidance space, and the centrifugal fan blades are connected between the inner peripheral surface of the ring body and the mounting plate.

[0013] In an optional embodiment, a plurality of the strip-shaped holes are arranged at intervals along the circumference of the ring body.

[0014] In an optional embodiment, the inner diameter of the ring body is larger than the outer diameter between the mounting plates, and an annular mounting space is formed between the inner circumference of the ring body and the outer circumference of the mounting plate. Each of the centrifugal blades is arranged in the mounting space and connected to the inner circumference of the ring body and the outer circumference of the mounting plate, wherein the projected length of the ring body on the central axis of the rotating shaft is smaller than the projected length of the centrifugal blade on the central axis of the rotating shaft, so that the avoidance space is left on the side of the ring body in the axial direction.

[0015] In an optional embodiment, the mounting plate has a plurality of openings to form a hollow shape.

[0016] In a second aspect, the utility model provides a generator comprising a housing, a stator assembly located in the housing, and a rotor assembly as described in any one of the aforementioned embodiments, wherein the stator assembly surrounds the outer circumference of the rotor assembly and is connected to the inner wall of the housing through at least two mounting rings, and the rotating shaft is rotatably disposed through the housing.

[0017] In an optional embodiment, the generator further includes an air guide ring, an outer ring of the air guide ring being connected to the inner wall of the outer casing, the air guide ring surrounding the outer side of the rotating shaft, the air guide ring being axially located on the outer side of the rotor winding and the stator winding of the stator assembly, the inner ring of the air guide ring extending toward the rotor winding, the air inlet area on the outer casing being axially located on the side of the air guide ring away from the stator assembly, and the air outlet area on the outer casing being axially located on the side of the air guide ring close to the stator assembly.

[0018] In an optional embodiment, the mounting ring is provided with a plurality of ventilation holes extending axially therethrough, and the air outlet area is located between the two outermost mounting rings among all the mounting rings.

[0019] Compared with the prior art, the beneficial effects of the embodiments of the present application include, for example:

[0020] The support ring and the end hoop can constrain the end of the rotor winding from both the inside and outside, ensuring the stability of the rotor winding end when the rotor rotates and preventing the rotor winding from displacement, deformation or vibration damage. The support ring with the centrifugal blades is fixed outside the rotating shaft. At the same time, because the end hoop and the centrifugal blades are staggered in the axial direction of the rotating shaft, the exposed portion of the rotor winding end not covered by the end hoop can correspond to the centrifugal blades in the radial direction. In this way, on the one hand, when the rotor rotates, the outer surface of the exposed portion of the rotor winding end has a large tangential velocity airflow, which exchanges heat with the air through convection and removes heat. On the other hand, when the rotor rotates, the support ring rotates accordingly, so that the centrifugal blades squeeze the air to form a radial airflow that can pass through the exposed portion of the rotor winding end from the inside to the outside, further enhancing convection heat exchange, reducing the temperature of the exposed portion, and thus shortening the heat conduction path of the remaining end portion, improving the overall heat dissipation efficiency, reducing the overall temperature rise of the rotor winding end, increasing the power output of the generator, and further improving the power density of the generator. The unit power generator cost is low, thus effectively reducing the cost of the generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 A schematic diagram of a partial structure of the internal structure of a generator according to an embodiment of the present application;

[0023] Figure 2 This is a schematic diagram of the combined structure of the rotor winding and the end hoop according to an embodiment of the present application;

[0024] Figure 3 This is one of the schematic diagrams of the support ring according to an embodiment of the present application;

[0025] Figure 4 This is the second schematic diagram of the support ring according to the embodiment of the present application;

[0026] Figure 5 This is a schematic diagram of the air guide ring according to an embodiment of the present application.

[0027] Icons: 100-rotor assembly; 110-rotating shaft; 120-rotor winding; 130-end hoop; 140-support ring; 141-centrifugal fan blade; 142-mounting plate; 1420-opening; 143-ring body; 1430-bar hole; 144-avoidance space; 150-air guide ring; 200-stator assembly; 210-stator winding; 300-housing; 310-air inlet area; 320-air outlet area; 400-mounting ring; 410-ventilation hole. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0031] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended only to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0033] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0034] The following is combined with Figures 1 to 5 , some embodiments of the present application are described in detail. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0035] An embodiment of the present application discloses a generator, which includes a housing 300 and a stator assembly 200 and a rotor assembly 100 located in the housing 300 .

[0036] The stator assembly 200 surrounds the outer circumference of the rotor assembly 100. The stator assembly 200 includes a stator core and a stator winding 210 wound around the stator core. The two ends of the stator winding 210 extend out of the two ends of the stator core along the axial direction of the stator core, that is, the end portions of the stator winding 210 extend out of the end portions of the stator core along the axial direction of the stator core.

[0037] The stator core of the stator assembly 200 is fixed to the inner wall of the housing 300 through at least two mounting rings 400 , thereby achieving fixation of the stator assembly 200 in the housing 300 .

[0038] The rotor assembly 100 includes a rotor, an end hoop 130 and a support ring 140 ; the rotor includes a rotating shaft 110 , a rotor core fixed to the rotating shaft 110 and a rotor winding 120 wound around the rotor core; the rotating shaft 110 is rotatably disposed through the housing 300 .

[0039] The two ends of the rotor winding 120 extend out of the two ends of the rotor core along the axial direction of the rotating shaft 110, that is, the ends of the rotor winding 120 extend out of the rotor core along the axial direction of the rotating shaft 110; the end hoop 130 is fixed outside the end of the rotor winding 120; the support ring 140 is fixed outside the rotating shaft 110, and the outer peripheral edge of the support ring 140 corresponds to the end of the rotor winding 120; wherein, the support ring 140 has a plurality of centrifugal blades 141 distributed at intervals in the circumferential direction, and the centrifugal blades 141 and the end hoop 130 are staggered in the axial direction of the rotating shaft 110.

[0040] Based on the above, the end of the rotor winding 120 can be constrained from both the inside and outside by the support ring 140 and the end hoop 130, thereby ensuring the stability of the end of the rotor winding 120 when the rotor rotates and preventing the rotor winding 120 from displacement, deformation or vibration damage. The support ring 140 with the centrifugal blades 141 is fixed outside the rotating shaft 110. At the same time, since the end hoop 130 and the centrifugal blades 141 are staggered in the axial direction of the rotating shaft 110, the exposed portion of the end of the rotor winding 120 that is not covered by the end hoop 130 can correspond to the centrifugal blades 141 in the radial direction. In this way, on the one hand, when the rotor rotates, the outer circular surface of the exposed portion of the end of the rotor winding 120 has a large tangential velocity airflow, which undergoes convection heat exchange with the air and takes away heat. On the other hand, when the rotor rotates, the support ring 140 rotates accordingly, so that the centrifugal blades 141 squeeze the air to form a radial airflow. It can pass through the exposed part of the end of the rotor winding 120 from the inside to the outside, further enhancing convective heat transfer, reducing the temperature of the exposed part, shortening the heat conduction path of the remaining part of the end of the rotor winding 120 (that is, the part covered by the end hoop 130), improving the overall heat dissipation efficiency, eliminating the original hot spot at the end of the rotor winding 120, reducing the overall temperature rise of the end of the rotor winding 120, increasing the power output of the generator, further improving the power density of the generator, and greatly reducing the amount of effective material used in the generator rotor at the same power. In addition, it also eliminates the need for an additional cooling fan, reduces the number of parts, and effectively reduces the cost of the generator.

[0041] In addition, since the ends of the stator winding 210 and the ends of the rotor winding 120 usually correspond to each other in the radial direction, the radial airflow can dissipate the heat from the ends of the stator winding 210 after passing through the ends of the rotor winding 120, thereby reducing the overall temperature of the generator. Moreover, the insulation life can be extended after the temperature rise at the ends of the rotor winding 120 is reduced.

[0042] The rotor winding 120 and the stator winding 210 are generally multi-layer coil structures, so radial airflow can pass through the upper and lower coils at the ends of the rotor winding 120 and the ends of the stator winding 210 for sufficient cooling.

[0043] Of course, it is understandable that since the rotor winding 120 extends out of the rotor core at both ends, the rotor winding 120 has two ends, each end has a corresponding end hoop 130 and a support ring 140, and the negative pressure sides of the support rings 140 at both ends of the rotor winding 120 are axially opposite to each other, that is, the negative pressure side of the centrifugal fan blade 141 is along the axial direction of the rotating shaft 110 toward the end of the housing 300.

[0044] Typically, the housing 300 has an air inlet area 310 and an air outlet area 320 to ensure that cooling air enters the housing 300 through the air inlet area 310 and that hot air after heat exchange is discharged to the outside of the housing 300 through the air outlet area 320 .

[0045] The air outlet area 320 is axially located between the two ends of the stator winding 210 and between the two ends of the rotor winding 120, and the air inlet area 310 is axially located outside the two ends of the stator winding 210 and outside the two ends of the rotor winding 120, so as to ensure that the cold air entering the housing 300 from the outside can be sucked in by the negative pressure side of the centrifugal blade 141 when the support ring 140 rotates with the rotating shaft 110 to form a radial airflow that blows outward toward the end of the rotor winding 120.

[0046] In this embodiment, in order to prevent the radial airflow passing through the ends of the rotor winding 120 and the stator winding 210 from interfering with the cold air entering from the air inlet area 310 and not affecting the overall air intake of the generator, the generator also includes an air guide ring 150. The outer ring of the air guide ring 150 is connected to the inner wall of the outer shell 300. The air guide ring 150 surrounds the outside of the rotating shaft 110. The air guide ring 150 is axially located on the outside of the rotor winding 120 and the stator winding 210 of the stator assembly 200. The inner ring of the air guide ring 150 extends toward the rotor winding 120. The air inlet area 310 on the outer shell 300 is axially located on the side of the air guide ring 150 away from the stator assembly 200, and the air outlet area 320 on the outer shell 300 is axially located on the side of the air guide ring 150 close to the stator assembly 200.

[0047] Based on the setting of the air guide ring 150, in order to ensure that the radial airflow can be discharged from the air outlet area 320 after passing through the end of the stator winding 210, the mounting ring 400 is provided with a plurality of ventilation holes 410 that pass through itself axially, and the air outlet area 320 is located between the two outermost mounting rings 400 among all the mounting rings 400.

[0048] In this embodiment, two or more end hoops 130 are fixed outside the end of the rotor winding 120, and a preset gap is left between two adjacent end hoops 130, so that the portion of the end of the rotor winding 120 corresponding to the preset gap is exposed, and the preset gap corresponds to the centrifugal fan blade 141 in the radial direction of the rotating shaft 110. In this way, while ensuring the constraint on the end of the rotor winding 120, the exposed portion is also divided into multiple sections and arranged at intervals in the axial direction. This can further shorten the heat conduction path between the portion covered by the end hoop 130 and the exposed portion on the end of the rotor winding 120, thereby improving the heat dissipation efficiency.

[0049] The support ring 140 includes a mounting plate 142 and a ring body 143 connected to the outer periphery of the mounting plate 142. The mounting plate 142 is mounted outside the rotating shaft 110. The end of the ring body 143 corresponds to the rotor winding 120. The centrifugal blades 141 are connected between the ring body 143 and the mounting plate 142. The ring body 143 has an escape space 144. The centrifugal blades 141, the escape space 144 and the preset gap correspond to each other in the radial direction of the rotating shaft 110. In this way, the radial airflow formed by the centrifugal blades 141 can be blown toward the exposed part of the rotor winding 120 through the escape space 144, thereby reducing the blocking effect of the ring body 143 used to support the end of the rotor winding 120 on the radial airflow.

[0050] The mounting plate 142 has a plurality of openings 1420 to form a hollow shape, so that a portion of the cold air entering the housing 300 can pass through the mounting plate 142 into the axially middle area on the rotating shaft 110, and then pass through the gaps of the rotor core, the axially middle part of the rotor winding 120 (that is, the part axially located on the outer periphery of the rotor core), the axially middle part of the stator winding 210 (that is, the part axially located on the inner periphery of the stator core) and the stator core, and finally be discharged to the outside from the air outlet area 320, so as to achieve heat dissipation of the middle section of the rotor and stator, so as to achieve overall heat dissipation of the rotor assembly 100 and the stator assembly 200 in combination with the above-mentioned support ring 140 and end hoop 130.

[0051] Specifically, the avoidance space 144 can be formed using the following two examples, but is certainly not limited to these examples and can also be other structures.

[0052] For example, one end of the ring body 143 is connected to the mounting plate 142, and a penetrating strip hole 1430 is provided on the peripheral wall of the ring body 143. The strip hole 1430 extends along the circumference of the ring body 143. The strip hole 1430 serves as an avoidance space 144, and the centrifugal fan blades 141 are connected between the inner peripheral surface of the ring body 143 and the mounting plate 142, so that the overall strength of the support ring 140 can be higher.

[0053] The plurality of strip-shaped holes 1430 are arranged at intervals along the circumference of the ring body 143 , thereby increasing the area of the radial airflow passing through the ring body 143 .

[0054] For another example, the inner diameter of the ring body 143 is larger than the outer diameter between the mounting plates 142, and an annular mounting space is formed between the inner circumference of the ring body 143 and the outer circumference of the mounting plate 142. Each centrifugal blade 141 is arranged in the mounting space and connected to the inner circumference of the ring body 143 and the outer circumference of the mounting plate 142. The ring body 143 and the preset gap are offset in the axial direction of the rotating shaft 110 so that avoidance space 144 is left on both sides of the ring body 143 in the axial direction.

[0055] In summary, the embodiments of the present application disclose a rotor assembly 100 and a generator, which can constrain the ends of the rotor winding 120 from both the inside and the outside through the support ring 140 and the end hoop 130, thereby ensuring the stability of the ends of the rotor winding 120 when the rotor rotates and preventing the rotor winding 120 from displacement, deformation or vibration damage. The support ring 140 with the centrifugal blades 141 is fixed outside the rotating shaft 110. At the same time, since the end hoop 130 and the centrifugal blades 141 are staggered in the axial direction of the rotating shaft 110, the exposed part of the end of the rotor winding 120 that is not covered by the end hoop 130 can correspond to the centrifugal blades 141 in the radial direction. In this way, on the one hand, when the rotor rotates, the outer circular surface of the exposed part of the end of the rotor winding 120 has a large tangential velocity airflow, which undergoes convective heat exchange with the air and takes away heat. On the other hand, when the rotor rotates, the support ring 140 rotates accordingly, so that the centrifugal blades 141 squeeze the air to form a radial airflow that can pass through the exposed part of the end of the rotor winding 120 from the inside to the outside, further enhancing convective heat exchange, reducing the temperature of the exposed part, shortening the heat conduction path of the remaining part of the end of the rotor winding 120 (that is, the part covered by the end hoop 130), improving the overall heat dissipation efficiency, eliminating the original hot spot at the end of the rotor winding 120, reducing the overall temperature rise of the end of the rotor winding 120, and increasing the power output of the generator. The power density of the generator is improved, which can be further improved. At the same power, the effective material usage of the generator rotor can be greatly reduced. In addition, the additional cooling fan is eliminated, the number of parts is reduced, and the cost of the generator is effectively reduced.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A rotor assembly (100), characterized in that: It includes a rotor, an end hoop (130) and a support ring (140); The rotor comprises a rotating shaft (110), a rotor core fixed to the rotating shaft (110), and a rotor winding (120) wound around the rotor core, wherein an end of the rotor winding (120) extends out of the rotor core along the axial direction of the rotating shaft (110); The end hoop (130) is fixed outside the end of the rotor winding (120); The support ring (140) is fixed outside the rotating shaft (110), and the outer periphery of the support ring (140) corresponds to the end of the rotor winding (120); wherein the support ring (140) has a plurality of centrifugal blades (141) distributed at intervals in the circumferential direction, and the centrifugal blades (141) and the end hoop (130) are staggered in the axial direction of the rotating shaft (110).

2. The rotor assembly (100) according to claim 1, characterized in that Two or more end hoops (130) are fixed outside the end of the rotor winding (120), and a preset gap is left between two adjacent end hoops (130), and the preset gap corresponds to the radial direction of the centrifugal blades (141) of the rotating shaft (110).

3. The rotor assembly (100) according to claim 2, characterized in that The support ring (140) includes a mounting plate (142) and a ring body (143) connected to the outer periphery of the mounting plate (142); the mounting plate (142) is sleeved outside the rotating shaft (110); the end of the ring body (143) corresponding to the rotor winding (120) and the centrifugal blades (141) are connected between the ring body (143) and the mounting plate (142); wherein the ring body (143) has an escape space (144); the centrifugal blades (141), the escape space (144) and the preset gap correspond in sequence in the radial direction of the rotating shaft (110).

4. The rotor assembly (100) according to claim 3, characterized in that One end of the ring body (143) is connected to the mounting plate (142), and a through-hole (1430) is provided on the peripheral wall of the ring body (143). The strip hole (1430) extends along the circumference of the ring body (143). The strip hole (1430) serves as the avoidance space (144), and the centrifugal blade (141) is connected between the inner peripheral surface of the ring body (143) and the mounting plate (142).

5. The rotor assembly (100) according to claim 4, characterized in that The plurality of strip-shaped holes (1430) are arranged at intervals along the circumference of the ring body (143).

6. The rotor assembly (100) according to claim 3, characterized in that The inner diameter of the ring body (143) is larger than the outer diameter between the mounting plates (142); an annular mounting space is formed between the inner circumference of the ring body (143) and the outer circumference of the mounting plates (142); each centrifugal blade (141) is arranged in the mounting space and connected to the inner circumference of the ring body (143) and the outer circumference of the mounting plates (142); wherein the projection length of the ring body (143) on the central axis of the rotating shaft (110) is smaller than the projection length of the centrifugal blade (141) on the central axis of the rotating shaft (110), so that the avoidance space (144) is reserved on the side of the ring body (143) in the axial direction.

7. The rotor assembly (100) according to claim 3, characterized in that The mounting plate (142) has a plurality of openings (1420) to form a hollow shape.

8. A generator, characterized in that: The invention comprises a housing (300), a stator assembly (200) located in the housing (300), and a rotor assembly (100) according to any one of claims 1 to 7, wherein the stator assembly (200) surrounds the outer circumference of the rotor assembly (100) and is connected to the inner wall of the housing (300) through at least two mounting rings (400), and the rotating shaft (110) is rotatably provided in the housing (300).

9. The generator according to claim 8, characterized in that The generator further comprises an air guide ring (150), the outer ring of which is connected to the inner wall of the housing (300), the air guide ring (150) surrounds the outer side of the rotating shaft (110), the air guide ring (150) is axially located outside the rotor winding (120) and the stator winding (210) of the stator assembly (200), the inner ring of the air guide ring (150) extends toward the rotor winding (120), the air inlet area (310) on the housing (300) is axially located on a side of the air guide ring (150) away from the stator assembly (200), and the air outlet area (320) on the housing (300) is axially located on a side of the air guide ring (150) close to the stator assembly (200).

10. The generator according to claim 9, characterized in that The mounting ring (400) is provided with a plurality of ventilation holes (410) that penetrate axially along the mounting ring, and the air outlet area (320) is located between the two outermost mounting rings (400) among all the mounting rings (400).

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