Asymmetric low-noise rotor assembly and automobile generator

Abstract

The application provides an asymmetric low-noise rotor assembly, two bearings are sleeved on a rotating shaft, an asymmetric rotor is fixed on the rotating shaft, the asymmetric rotor comprises two pole claws, each pole claw comprises a ring body and a tooth-shaped claw, the thickness of the tooth-shaped claw gradually increases from a tooth top part to a tooth root part, the outer surface of the tooth-shaped claw is on the same annular surface, an arc-shaped groove is arranged between the tooth root parts of two adjacent tooth-shaped claws, a transition arc surface is arranged between one side surface of the tooth-shaped claw and the outer surface, a magnetic block is fixed on the ring body, and a guide vane is also fixed on the ring body. The directional change of the thickness of the tooth-shaped claw can reduce the vibration of the generator stator and rotor structure and the electromagnetic noise caused by the vibration. According to the aerodynamic principle, when the rotor rotates continuously, the guide vane draws cold air in the air from the outside of the pole claw to cool the whole rotor.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, specifically relating to an asymmetric low-noise rotor assembly and an automotive generator. Background Technology

[0002] An electric motor is an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction. The main function of an electric motor is to generate driving torque through the electromagnetic induction of the rotor assembly, serving as a power source for electrical appliances or various machines. Electric motors can be classified into DC motors and AC motors according to their input current. The rotor assembly is the transmission component inside the motor; it refers to a rotating body supported by bearings and is often the main rotating component in power machinery and working machinery.

[0003] The power lost by the motor is converted into heat and accumulates in the generator. Therefore, the motor needs to address the issue of heat dissipation. When starting the motor, it needs to overcome the difficulty of directional starting caused by a large load. At the same time, the drastic changes in operating speed and load generate significant noise.

[0004] A Chinese invention patent with publication number CN111600421A discloses a noise-reducing variable frequency brake motor, comprising a housing, a stator winding fixed within the housing, and a rotor rotatably disposed within the stator winding. The housing includes an inner shell covering the stator winding, and an outer shell covering the inner shell. An output plate is fixed to one end of the outer shell near the rotor output end, and a heat sink is fixed to the outer shell away from the output plate. The end of the inner shell away from the heat sink is fixed to the inner wall of the outer shell. A sound-absorbing plate is fixed between the inner shell and the outer shell, covering the outside of the inner shell. This invention has the effect of absorbing noise generated inside the motor and reducing the impact of noise on the working environment.

[0005] An arc-shaped tail plate is integrally formed on the inner shell near the heat sink end. The arc-shaped tail plate bends towards the axis of the inner shell and extends into the heat sink. The heat sink includes a cover fixed to the end face of the inner shell and a truncated cone integrally formed with the middle of the inner bottom surface of the cover. The waistline of the truncated cone is arc-shaped and concave towards the axis of the truncated cone. Multiple fans are evenly distributed along the circumference of the truncated cone at the end away from the bottom surface of the cover. Multiple heat dissipation holes are opened on the circumference of the outer shell at the end away from the heat sink and are evenly distributed along the circumference of the outer shell. This invention generates airflow through the fans, which can not only remove the heat generated by the stator windings, but also remove the heat between the inner shell and the outer shell, thus improving the heat dissipation efficiency of the motor.

[0006] In the aforementioned prior art, while the fan generates airflow to remove heat from the stator windings, the airflow also enters the gap between the outer and inner shells, carrying away heat from the sound insulation panel and dissipating it to the outside of the motor through the heat dissipation holes. However, the airflow only exits and does not enter, creating a negative pressure environment inside the inner shell, affecting the normal rotation of the rotor. If an air inlet is directly opened to supplement the airflow into the inner shell, a rapidly flowing airflow will be formed inside the inner shell. This will cause turbulence between the rotor and the shaft under the action of the rapidly flowing airflow, resulting in severe friction or collision between the shaft and the inlet during rotation, producing operational fluctuations and noise, directly affecting the noise reduction effect. Summary of the Invention

[0007] To address the problems existing in the background art, the present invention provides an asymmetric low-noise rotor assembly and an automotive generator using the asymmetric low-noise rotor assembly.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] An asymmetric low-noise rotor assembly includes: a rotating shaft on which two bearings are spaced apart; and an asymmetric rotor fixedly mounted on the rotating shaft and located between the two bearings.

[0010] The asymmetric rotor includes two opposing and staggered pole claws. Each pole claw includes an annular body and six evenly arranged toothed claws. The thickness of the toothed claws gradually increases from the tooth tip to the tooth root, and the outer surfaces of the toothed claws are on the same annular surface. An arc-shaped groove is provided between the tooth roots of two adjacent toothed claws. A transition arc-shaped surface is provided between one side and the outer side of the toothed claw, and the transition arc-shaped surface gradually decreases from the tooth root to the tooth tip. A magnetic block is fixedly provided on the annular body, and a guide vane is also fixedly provided on the annular body.

[0011] The beneficial effects are as follows: the directional variation in the thickness of the toothed claws reduces the amplitude and speed of radial force wave changes when the asymmetric rotor rotates through the stator core tooth angle, thereby reducing the vibration of the generator stator and rotor structures and the resulting electromagnetic noise. The unidirectional transition arc surfaces on the toothed claws help improve directional starting. Utilizing aerodynamic principles, as the rotor rotates continuously, guide vanes draw in cool air from the outside of the pole claws, cooling the entire rotor.

[0012] As a further improvement, the tooth tip surface of the toothed claw is inclined, and the tooth tip surface of the toothed claw is inclined from the inner side of the tooth tip surface to the outer side of the tooth tip surface. The angle between the plane where any tooth tip surface is located and the axis of the rotating shaft is 87°≤a<90°.

[0013] The automotive alternator, employing the aforementioned asymmetric low-noise rotor assembly, also includes,

[0014] A housing, which defines an internal cavity; a rotating shaft is disposed within the cavity along the axial direction of the housing, and the rotating shaft is rotatably connected to the two end sidewalls of the housing via two bearings; a stator, which is movably sleeved on the outside of the asymmetrical rotor; the stator is fixedly connected to the housing; a soundproof shell, which covers the outside of the housing and is used to absorb sound waves, and air ducts are opened through the soundproof shell and the two end sidewalls of the housing, one of which is equipped with an exhaust fan for drawing cold air from outside into the housing, and the other air duct is equipped with an exhaust fan for expelling hot air from inside the housing; a rubber ring, which is fixedly sleeved on the outer ring of the bearing and fixedly connected to the housing.

[0015] The beneficial effects are as follows: When the asymmetrical rotor and shaft rotate, they will generate heat. When the exhaust fan and the ventilation fan are turned on, the exhaust fan can remove the heat from the housing, and the ventilation fan can draw in the cool air from outside the housing. This creates a fast-flowing airflow inside the housing, which can quickly cool the inside of the housing.

[0016] As the airflow moves rapidly inside the casing, it causes turbulence in the asymmetrical rotor and shaft within the casing. This results in the shaft rubbing or colliding violently with the rotating hole during rotation, generating operational fluctuations and noise. The presence of the rubber ring provides stable support for the shaft and cushions its wobbling, thus preventing violent friction or collision between the shaft and the rotating hole, preventing operational fluctuations, and reducing noise.

[0017] As a further improvement, the air duct is arranged around the rotating shaft, and the air duct is vortex-shaped.

[0018] The beneficial effects are as follows: exhaust fans and ventilation fans also generate noise when they are operating. By setting the air duct to a vortex shape, the length of the vortex air duct is extended and it is a curved path. This allows the sound waves to travel through it, extending the path of the sound waves and allowing the energy of the sound waves to be gradually absorbed by the sound insulation shell, thereby further improving the noise reduction effect.

[0019] As a further improvement, the exhaust fan and the ventilation fan are located at one end of the corresponding air duct near the rotating shaft.

[0020] The beneficial effects are: the exhaust fan and the ventilation fan are close to the shaft, which is close to the receiving cavity, so that the generated airflow can be directly introduced into the receiving cavity at close range, which is more conducive to forming a fast-flowing airflow in the receiving cavity.

[0021] As a further improvement, the vortex-shaped air duct is in the same plane, and the end of the air duct away from the rotating axis passes through the circumferential side wall of the sound insulation shell. Air holes are opened on the end side wall of the sound insulation shell, and through holes are opened on the end side wall of the shell. The air duct is connected to the receiving cavity through the air holes and through holes.

[0022] As a further improvement, the two vortex-shaped air ducts are symmetrically arranged.

[0023] The beneficial effects are as follows: the vortex-shaped air ducts are located in the same plane, and the two vortex-shaped air ducts are symmetrically arranged, that is, the planes in which the two vortex-shaped air ducts are located are parallel to each other. This ensures that the air intake airflow and the air exhaust airflow flow in the same plane, and the two planes are parallel to each other. This prevents the airflow from exerting irregular (uncertain direction) forces on the sound insulation shell / shell, thus avoiding affecting stability.

[0024] As a further improvement, a filter screen is installed inside the air duct.

[0025] The beneficial effect is that it filters the airflow entering the housing, preventing external impurities from entering the housing.

[0026] As a further improvement, a fixing cylinder is fixedly installed on the inner sidewall of one end of the housing along the axial direction of the housing. One end of the rotating shaft is rotatably connected to the inner sidewall of the fixing cylinder, and the other end of the rotating shaft passes through the other sidewall of the housing and is rotatably connected to that sidewall.

[0027] The beneficial effects are: while ensuring the function, it provides stable support for the rotating shaft, ensuring that the shaft rotates stably and reliably.

[0028] As a further improvement, the soundproof shell is made of a porous soundproof material.

[0029] As a further improvement, the soundproof shell is made of aluminum foam.

[0030] The beneficial effect is that the porous structure on the soundproof shell can absorb sound waves, thereby achieving a good noise reduction effect.

[0031] This application has the following beneficial effects:

[0032] 1. The directional variation in the thickness of the toothed claws reduces the amplitude and speed of radial force wave changes when the asymmetric rotor rotates through the stator core tooth angle, thereby reducing the vibration of the generator stator and rotor structures and the resulting electromagnetic noise. The unidirectional transition arc surfaces on the toothed claws help improve directional starting. Utilizing aerodynamic principles, as the rotor rotates continuously, guide vanes draw in cool air from the outside of the pole claws, cooling the entire rotor.

[0033] 2. The exhaust fan removes heat from the housing, while the ventilation fan draws in cool air from outside, creating a rapid airflow inside the housing that quickly cools it down. The asymmetrical rotor and shaft inside the housing become turbulent under the influence of the rapid airflow. The rubber ring provides stable support for the shaft, cushioning its wobbling and preventing violent friction or collision between the shaft and the rotating hole. This prevents operational fluctuations and reduces noise.

[0034] 3. The air duct is arranged around the rotating shaft and is vortex-shaped, which can extend the length of the air duct. The curved path of the air duct allows the sound waves generated by the exhaust fan and ventilation fan to travel through the air duct, extending the path of the sound waves and gradually absorbing the energy of the sound waves into the sound insulation shell, further improving the noise reduction effect.

[0035] 4. The soundproof shell is made of a porous soundproof material. The porous structure on the soundproof shell can absorb sound waves, thereby achieving a good noise reduction effect. Attached Figure Description

[0036] The above and other objects, features, and advantages of exemplary embodiments of the present invention will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the invention are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0037] Figure 1 This is a schematic diagram of the asymmetric low-noise rotor assembly in Embodiment 1 of the present invention;

[0038] Figure 2 This is a schematic diagram of the pole claw structure in Embodiment 1 of the present invention;

[0039] Figure 3 This is a schematic diagram of the pole claw structure in Embodiment 1 of the present invention;

[0040] Figure 4 This is a schematic diagram of the structure of the automobile generator in Embodiment 2 of the present invention;

[0041] Figure 5 This is a three-dimensional schematic diagram of the first vortex groove in Embodiment 2 of the present invention.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Housing; 2. Stator; 3. Asymmetric rotor; 31. Pole claw; 311. Annular body; 312. Toothed claw; 313. Magnetic block; 314. Transition arc surface; 315. Tooth tip surface; 316. Guide vane; 4. Shaft; 5. Rotary hole; 6. Sound insulation shell; 7. Mounting hole; 8. Fixing cylinder; 9. First rubber ring; 10. First bearing; 11. First through hole; 12. Second through hole; 13. First vortex groove; 14. First air hole; 15. Exhaust hole; 16. Exhaust fan; 17. Second vortex groove; 18. Second air hole; 19. Air inlet; 20. Exhaust fan; 21. Second rubber ring; 22. Second bearing. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0045] Example 1

[0046] like Figures 1-3 As shown, an asymmetric low-noise rotor assembly includes: a rotating shaft 4, on which two bearings are spaced apart.

[0047] The asymmetrical rotor 3 is fixedly mounted on the shaft 4 and located between two bearings.

[0048] The asymmetric rotor 3 includes two opposite and staggered pole claws 31.

[0049] The pole claw 31 includes an annular body 311, a magnetic block 313, and six evenly arranged toothed claws 312. The toothed claws 312 are fixedly mounted on the annular body 311. The six evenly arranged toothed claws 312 are distributed on the side surface of the annular body 311. The magnetic block 313 is fixed on the annular body 311 and located inside the six toothed claws 312. The magnetic blocks 313 of two pole claws 31 are arranged facing each other. A guide vane 316 is also fixedly mounted on the annular body 311. The guide vane 316 is located on the end face of the annular body 311 facing away from the magnetic block 313.

[0050] An arc-shaped groove is provided between the tooth roots of two adjacent toothed claws 312.

[0051] The outer surfaces of the toothed claw 312 are on the same annular surface.

[0052] The thickness of the toothed claw 312 gradually increases from the tooth tip to the tooth root.

[0053] The toothed claw 312 has a transition arc surface 314 between one side and the outer side, and the transition arc surface 314 gradually decreases from the root of the tooth to the top of the tooth.

[0054] The toothed claw 312 has an inclined tooth tip surface, which is inclined from the inside to the outside of the tooth tip surface. The angle α between the plane containing any tooth tip surface and the axis of the rotating shaft 4 is 88°.

[0055] The directional variation in the thickness of the toothed claw 312 can reduce the amplitude and speed of radial force wave changes when the asymmetric low-noise rotor assembly rotates through the stator core tooth angle, thereby reducing the vibration of the generator stator and rotor structures and the resulting electromagnetic noise. The unidirectional transition arc surface 314 on the toothed claw 312 helps improve directional starting.

[0056] Utilizing aerodynamic principles, as the asymmetric low-noise rotor rotates continuously, the guide vanes 316 draw in cool air from the outside of the pole claws to cool the asymmetric low-noise rotor.

[0057] Example 2

[0058] To reduce noise, a soundproof shell is used to absorb sound waves on the outside of the casing. To improve cooling, air ducts are cut through both the soundproof shell and the side walls at both ends of the casing. One duct houses an exhaust fan, and the other a desiccant fan, creating a rapid airflow within the casing for rapid cooling. To prevent the rapid airflow from causing turbulence in the asymmetrical rotor and shaft, and to avoid operational fluctuations and noise caused by severe friction or collision between the shaft and the rotating hole during rotation, a rubber ring is fixedly fitted to the bearing mounted on the shaft. This rubber ring is fixedly connected to the casing, providing stable support for the shaft and cushioning its wobbling. This prevents severe friction or collision between the shaft and the rotating hole, thus reducing noise and operational fluctuations.

[0059] like Figure 4 As shown, an automotive generator includes a housing 1, which defines a receiving cavity. The housing 1 is horizontally arranged in the left-right direction. A rotating shaft 4 is mounted axially along the housing 1 within the receiving cavity. Two bearings are spaced apart on the rotating shaft 4, and the rotating shaft 4 is rotatably connected to the end sidewalls of the housing 1 through these two bearings. The housing 1 is externally covered by a soundproof shell 6.

[0060] Specifically, a fixed cylinder 8 is welded to the inner left side wall of the housing 1 along the axial direction of the housing 1. A second bearing 22 is fixedly mounted on the left end of the rotating shaft 4. The inner ring of the second bearing 22 is fixedly mounted on the outer circumferential side wall of the left end of the rotating shaft 4. A second rubber ring 21 is fixedly mounted on the outer circumferential side wall of the outer ring of the second bearing 22. The outer circumferential side wall of the second rubber ring 21 is fixedly connected to the inner circumferential side wall of the fixed cylinder 8.

[0061] A rotating hole 5 is formed through the right side wall of the housing 1, and a mounting hole 7 is formed through the right side wall of the soundproof housing 6 at a position corresponding to the rotating hole 5. The rotating shaft 4 moves through the rotating hole 5 and the mounting hole 7. A first bearing 10 is fixedly mounted on the right end of the rotating shaft 4. The inner ring of the first bearing 10 is fixedly mounted on the outer circumferential side wall of the right end of the rotating shaft 4. A first rubber ring 9 is fixedly mounted on the outer circumferential side wall of the outer ring of the first bearing 10, and the outer circumferential side wall of the first rubber ring 9 is fixedly connected to the mounting hole 7. While ensuring normal function, this provides stable support for the rotating shaft 4, ensuring that the rotation of the shaft 4 is stable and reliable.

[0062] An asymmetrical rotor 3, which rotates together with the rotating shaft 4, is mounted on the rotating shaft 4. The asymmetrical rotor 3 is located within the receiving cavity and between the first bearing 10 and the second bearing 22. A stator 2 is movably mounted outside the asymmetrical rotor 3, and the stator 2 is fixedly connected to the housing 1.

[0063] A duct for air intake is formed through the left sidewall of the soundproof shell 6 and the shell 1. An exhaust fan 20 is installed in the duct. When the exhaust fan 20 is turned on, cold air from outside the shell 1 is drawn into the shell 1. A duct for air exhaust is formed through the right sidewall of the soundproof shell 6 and the shell 1. An exhaust fan 16 is installed in the duct. When the exhaust fan 16 is turned on, the heat generated inside the shell 1 due to the rotation of the asymmetrical rotor 3 and the shaft 4 is exhausted to the outside of the shell 1.

[0064] Through the above technical solution, the heat generated by the asymmetric rotor 3 and shaft 4 during rotation can be quickly dissipated by activating the exhaust fan 16 and the ventilation fan 20. The exhaust fan 16 removes the heat from the housing 1, while the ventilation fan 20 draws in cool air from outside the housing 1, creating a rapid airflow inside the housing 1 for rapid cooling. During this rapid airflow, the asymmetric rotor 3 and shaft 4 become turbulent, causing the shaft 4 to rub or collide violently with the rotating hole 5, resulting in operational fluctuations and noise. The presence of the first rubber ring 9 and the second rubber ring 21 provides stable support for the shaft 4, buffering its sway and preventing violent friction or collisions between the shaft 4 and the rotating hole 5, thus reducing noise while preventing operational fluctuations.

[0065] like Figure 4 As shown, both the air inlet duct and the air outlet duct are arranged around the rotating shaft 4. Figure 5 As shown, both air ducts are vortex-shaped. The vortex-shaped air duct used for air intake is the second vortex groove 17, and the vortex-shaped air duct used for air outlet is the first vortex groove 13.

[0066] When the exhaust fan 16 and the ventilation fan 20 are operating, they will generate noise. By setting the air duct to a vortex shape, the length of the vortex air duct is extended and it is a curved path. This allows the sound waves to travel through it, extending the path of the sound waves and allowing the energy of the sound waves to be gradually absorbed by the sound insulation shell 6, thereby further improving the noise reduction effect.

[0067] like Figure 4 As shown, the second vortex groove 17 is located in the same plane. The end of the second vortex groove 17 away from the rotating shaft 4 penetrates the circumferential sidewall of the soundproof shell 6, forming an air inlet 19. A second air hole 18 is opened on the left sidewall of the soundproof shell 6, and a second through hole 12 is opened through the left sidewall of the shell 1. The second vortex groove 17 communicates with the receiving cavity through the second air hole 18 and the second through hole 12. The first vortex groove 13 is also located in the same plane. The end of the first vortex groove 13 away from the rotating shaft 4 penetrates the circumferential sidewall of the soundproof shell 6, forming an exhaust hole 15. A first air hole 14 is opened on the right sidewall of the soundproof shell 6, and a first through hole 11 is opened through the right sidewall of the shell 1. The first vortex groove 13 communicates with the receiving cavity through the first air hole 14 and the first through hole 11. The first vortex groove 13 and the second vortex groove 17 are arranged symmetrically.

[0068] The first vortex groove 13 and the second vortex groove 17 are located in the same plane, and the first vortex groove 13 and the second vortex groove 17 are symmetrically arranged on the left and right side walls of the sound insulation shell 6. That is, the plane where the first vortex groove 13 is located and the plane where the second vortex groove 17 is located are parallel to each other, ensuring that the intake airflow and the exhaust airflow flow in the same plane, and the two planes are parallel to each other. This prevents the airflow from exerting irregular (uncertain direction) forces on the sound insulation shell 6 / shell 1, thus avoiding affecting the overall stability.

[0069] The exhaust fan 20 is located inside the second vortex groove 17 near one end of the rotating shaft 4, and the exhaust fan 16 is located inside the first vortex groove 13 near one end of the rotating shaft 4. Both the exhaust fan 20 and the exhaust fan 16 are close to the rotating shaft 4, that is, close to the receiving cavity, which allows the generated airflow to be directly introduced / exported into the receiving cavity at close range, which is more conducive to forming a fast-flowing airflow in the receiving cavity.

[0070] A filter screen is installed at one end of the second vortex groove 17 near the air inlet 19, which filters the airflow drawn into the second vortex groove 17 and prevents external impurities from entering the housing 1.

[0071] The soundproof shell 6 is made of foamed aluminum. Foamed aluminum is a current technology material made by adding additives to pure aluminum or aluminum alloys and then performing a foaming process. It combines the characteristics of both metal and air bubbles. It has low density, high impact absorption capacity, high temperature resistance, strong fire resistance, corrosion resistance, sound insulation and noise reduction, low thermal conductivity, high electromagnetic shielding, strong weather resistance, filtering capacity, easy processing, easy installation, high forming precision, and can be surface coated. The porous structure of the soundproof shell 6 made of foamed aluminum can absorb sound waves, thereby achieving a good noise reduction effect.

[0072] Working principle / usage method of this invention:

[0073] During use, the asymmetric rotor 3 and shaft 4 generate heat when rotating. This activates the exhaust fan 16 and the ventilation fan 20. The exhaust fan 16 exhausts the heat inside the housing 1 to the outside of the housing 1 through the first through hole 11, the first air hole 14, the first vortex groove 13 and the exhaust hole 15. The ventilation fan 20 draws cold air from the outside into the housing 1 through the air inlet 19, the second vortex groove 17, the second air hole 18 and the second through hole 12. This creates a fast-flowing airflow inside the housing 1, which rapidly cools the inside of the housing 1.

[0074] A rapidly flowing airflow is formed inside the housing 1. During this flow, the asymmetrical rotor 3 and shaft 4 inside the housing 1 become turbulent, causing the shaft 4 to experience severe friction or collision with the rotating hole 5 during rotation. If the shaft 4 does not receive adequate stable support, it will produce operational fluctuations and noise. The presence of the first rubber ring 9 and the second rubber ring 21 prevents this problem from occurring. A first rubber ring 9 is fixedly fitted inside the mounting hole 7 (the first rubber ring 9 can also extend and be fixedly fitted inside the mounting hole 7 and the rotating hole 5). The first rubber ring 9 is fixedly fitted on the outer ring of the first bearing 10, and the inner ring of the first bearing 10 is fixedly fitted on the rotating shaft 4. A second rubber ring 21 is fixedly fitted inside the fixed cylinder 8. The second rubber ring 21 is fitted on the outer ring of the second bearing 22, and the inner ring of the second bearing 22 is fixedly fitted on the rotating shaft 4. In this way, when the rotating shaft 4 shakes during rotation, the first rubber ring 9 and the second rubber ring 21 can buffer the shaking and provide stable support for the rotating shaft 4, thereby avoiding severe friction or collision between the rotating shaft 4 and the rotating hole 5 (rotating hole 5 and / or mounting hole 7), preventing operational fluctuations, and reducing noise.

[0075] Noise generated inside the housing 1 will pass through the housing 1 and come into contact with the soundproof shell 6. The porous structure of the soundproof shell 6 will absorb the sound waves, thereby achieving a good noise reduction effect. At the same time, the exhaust fan 16 and the ventilation fan 20 will also generate noise. Since the first vortex groove 13 and the second vortex groove 17 are both vortex-shaped, and the first vortex groove 13 and the second vortex groove 17 define curved path, the propagation length of the noise in the first vortex groove 13 and the second vortex groove 17 can be extended. This makes the first vortex groove 13 and the second vortex groove 17 longer and curved, so that when the sound waves pass through the first vortex groove 13 and the second vortex groove 17, the energy of the sound waves is gradually absorbed by the soundproof shell 6, further improving the noise reduction effect.

Claims

1. An automotive generator, characterized in that, include: A rotating shaft (4) on which two bearings are fitted at intervals; An asymmetrical rotor (3) is fixedly mounted on a rotating shaft (4) and located between two bearings; The asymmetric rotor (3) includes two opposing and staggered pole claws (31). Each pole claw (31) includes an annular body (311) and six evenly arranged toothed claws (312). The thickness of each toothed claw (312) gradually increases from the tooth tip to the tooth root, and the outer surface of each toothed claw (312) is on the same annular surface. An arc groove is provided between the tooth roots of two adjacent toothed claws (312). A transition arc surface (314) is provided between one side and the outer side of each toothed claw (312), and the transition arc surface (314) gradually decreases from the tooth root to the tooth tip of the toothed claw (312). A magnetic block (313) is fixedly provided on the annular body (311), and a guide vane (316) is also fixedly provided on the annular body (311). The housing (1) has a cavity defined inside it; the rotating shaft (4) is arranged in the cavity along the axial direction of the housing (1), and the rotating shaft (4) is rotatably connected to the side walls of both ends of the housing (1) through two bearings; The stator (2) is movably mounted on the outside of the asymmetric rotor (3); The stator (2) is fixedly connected to the housing (1); The soundproof shell (6) covers the outside of the shell (1) and is used to absorb sound waves. Both the soundproof shell (6) and the shell (1) have air ducts through them. One of the air ducts is equipped with an exhaust fan (20) for drawing cold air from outside into the shell (1), and the other air duct is equipped with an exhaust fan (16) for expelling hot air from the shell (1). A rubber ring is fixedly fitted on the outer ring of the bearing and is fixedly connected to the housing (1).

2. The automotive generator according to claim 1, characterized in that, The toothed claw (312) has an inclined tooth tip surface, and the tooth tip surface of the toothed claw (312) is inclined from the inside of the tooth tip surface to the outside of the tooth tip surface. The angle between the plane where any tooth tip surface is located and the axis of the rotating shaft (4) is 87°≤a<90°.

3. The automotive generator according to claim 1, characterized in that, The air duct is arranged around the rotating shaft (4) and the air duct is vortex-shaped.

4. The automotive generator according to claim 3, characterized in that, The exhaust fan (20) and the ventilation fan (16) are located in the corresponding air ducts at one end near the rotating shaft (4).

5. The automotive generator according to claim 4, characterized in that, The vortex-shaped air duct is in the same plane. The end of the air duct away from the rotating shaft (4) passes through the circumferential side wall of the sound insulation shell (6). Air holes are opened on the end side wall of the sound insulation shell (6), and through holes are opened on the end side wall of the shell (1). The air duct is connected to the receiving cavity through the air holes and through holes.

6. The automotive generator according to claim 3, 4, or 5, characterized in that, Two vortex-shaped air ducts are symmetrically arranged.

7. The automotive generator according to claim 1, characterized in that, A filter screen is installed inside the air duct.

8. The automotive generator according to claim 1, characterized in that, A fixing cylinder (8) is fixedly installed on the inner side wall of one end of the housing (1) along the axial direction of the housing (1). One end of the rotating shaft (4) is rotatably connected to the inner side wall of the fixing cylinder (8), and the other end of the rotating shaft (4) passes through the other side wall of the housing (1) and is rotatably connected to that side wall.

9. The automotive generator according to claim 1, characterized in that, The soundproof shell (6) is made of a porous soundproof material.

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