Efficient energy-saving motor and fan

Abstract

The invention provides a high-efficiency energy-saving motor and fan, and relates to the field of motors and fans, the motor comprises a shell, and a stator and a rotor arranged in the shell, the rotor comprises a rotor shaft, a plastic part and an annular permanent magnet, the plastic part is fixed on the periphery of the rotor shaft in a wrapping manner, and the annular permanent magnet is fixedly arranged on the peripheral side of the plastic part; the annular permanent magnet is formed by compounding magnetic powder and a binder, N pole areas and S pole areas are alternately distributed in the circumferential direction, and the magnetic powder orientation directions of the adjacent magnetic pole areas are opposite. Through three-layer structure innovation of rotor shaft-plastic part-annular permanent magnet, multiple technical breakthroughs are realized. The plastic part replaces a traditional silicon steel sheet to thoroughly eliminate eddy current loss and lamination process defects. Due to the arrangement of the annular permanent magnets, the space utilization rate reaches nearly 100%, the magnetic powder generates high magnetic flux under alternate orientation arrangement, the power density of the rotor is remarkably improved, the weight of the rotor is greatly reduced through the light-weight integrated structure, and the fan obtains higher wind power output.

Description

Technical Field

[0001] The present application relates to the technical field of motors and fans, and in particular to a high-efficiency and energy-saving motor and fan. Background Art

[0002] Permanent magnet motors (PMMs) are currently widely used in household appliances, industrial equipment, and ventilation systems, such as fans and air conditioner blowers. Conventional PMM rotors typically utilize an axially laminated structure of silicon steel sheets with multiple discrete permanent magnets (such as NdFeB magnets) arranged circumferentially. However, this structure has the following inherent drawbacks:

[0003] 1. Low space utilization: Since a gap (1-2mm) needs to be reserved between permanent magnets to prevent magnetic short circuit, the effective magnetic flux area of ​​the rotor is limited, the magnetic energy utilization is insufficient, and the power density of the motor is affected.

[0004] 2. Complex process and high cost: Traditional rotors need to go through multiple processes such as silicon steel sheet stamping, lamination, and permanent magnet inlaying. High assembly precision is required, and the magnetic blocks are prone to fall off due to centrifugal force during high-speed operation, increasing manufacturing costs and the risk of failure.

[0005] 3. Eddy current loss problem: Although lamination of silicon steel sheets can reduce eddy current loss, there is still a risk of insulation layer failure between the laminations. Especially under high temperature or high frequency conditions, eddy current loss is aggravated, resulting in reduced motor efficiency.

[0006] 4. Weight and inertia issues: The high density of silicon steel sheets and metal magnets results in a heavy rotor, slow starting and speed regulation response, which is not conducive to energy saving and high-speed applications. Summary of the Invention

[0007] In view of this, the present application proposes a high-efficiency and energy-saving motor and fan to solve the problems that the existing permanent magnet motor rotor has obvious deficiencies in magnetic circuit design, manufacturing process and lightweight.

[0008] The technical solution of this application is achieved as follows: In the first aspect, the present application provides a high-efficiency and energy-saving motor, comprising a housing and a stator and a rotor arranged inside the housing, the rotor comprising a rotor shaft, a plastic part and an annular permanent magnet, the plastic part being wrapped and fixed on the outer periphery of the rotor shaft, the annular permanent magnet being fixed on the outer peripheral side of the plastic part, the annular permanent magnet being composed of a composite of magnetic powder and a binder, and having N-pole regions and S-pole regions alternately distributed in the circumferential direction, and the magnetic powder orientation directions of adjacent magnetic pole regions are opposite.

[0009] On the basis of the above technical solution, preferably, the plastic part includes an annular cylinder, and the bottom edge of the annular cylinder extends outward to form a support plate; The annular permanent magnet is fixedly arranged on the outside of the annular cylinder and connected to the support plate. The side wall of the annular cylinder is provided with a plurality of embedded grooves connected to the annular permanent magnet; A fixed sleeve is provided on the central axis of the annular cylinder, the rotor shaft is inserted into the fixed sleeve and fixedly connected to the fixed sleeve, and a number of reinforcing ribs are evenly provided between the annular cylinder and the fixed sleeve; The reinforcing ribs extend in a radial direction to the bottom surface of the support plate and protrude downward to form a blade structure, and the blade structure is used to centrifugally throw the hot air inside the shell toward the inner wall of the shell.

[0010] On the basis of the above technical solution, preferably, the plastic part and the rotor shaft are combined through an integral injection molding process.

[0011] Based on the above technical solution, preferably, the annular permanent magnet is integrally combined with the periphery of the plastic part through a secondary injection molding process, and the magnetic powder of the N-pole region and the S-pole region is alternately oriented along the circumferential direction through an oriented magnetic field.

[0012] Based on the above technical solution, preferably, the melting point of the plastic part is greater than the melting point of the annular permanent magnet, the plastic part is made of PPS material, the magnetic powder in the annular permanent magnet is neodymium iron boron powder, and the binder is epoxy resin or polyamide thermosetting material.

[0013] Based on the above technical solution, preferably, a mounting portion is provided on the inner bottom surface of the shell, a sealed bearing connected to the rotor shaft is provided in the mounting portion, and a receiving groove is formed in the top surface of the plastic part, and the mounting portion is received in the receiving groove.

[0014] In the second aspect, the present application provides a high-efficiency energy-saving fan, comprising a fan impeller and the high-efficiency energy-saving motor described in the first aspect, the fan impeller comprising a wheel cover, a rim and blades, the rim being coaxially sleeved on the outside of the wheel cover, a plurality of blades being provided, evenly arranged on the outer periphery of the wheel cover and fixedly connected to the rim, the wheel cover being coaxially sleeved outside the shell, and one end of the rotor shaft extending out of the shell being fixedly connected to the wheel cover.

[0015] On the basis of the above technical solution, preferably, the inner top surface and inner side wall of the wheel cover are evenly provided with a plurality of air guide strips around the central axis of the wheel cover, and the air guide strips are used to centrifugally guide the airflow in the wheel cover to the outer wall of the shell.

[0016] On the basis of the above technical solution, preferably, a transition structure extending outward is formed at the connection between the blade and the rim, and the end of the transition structure is deflected outward by 0.5°±0.1° relative to the chord length direction of the blade.

[0017] On the basis of the above technical solution, preferably, it also includes a fan base, which includes an inner ring, an outer ring and fixed ribs, the fixed ribs are evenly distributed on the outside of the inner ring and fixedly connected to the outer ring, the inner ring is fixedly connected to the motor housing, and the deflection direction of the fixed ribs is opposite to the deflection direction of the blades.

[0018] Compared with the prior art, this application has the following beneficial effects: (1) The motor disclosed in this application has achieved multiple technological breakthroughs through the innovative three-layer structure of "rotor shaft-plastic parts-annular permanent magnets": the plastic parts replace traditional silicon steel sheets to completely eliminate eddy current losses and lamination process defects; the setting of the annular permanent magnets not only achieves a space utilization rate of nearly 100%, but its evenly distributed magnetic powder produces high magnetic flux and stable sinusoidal magnetic effect under alternating orientation, significantly improving the rotor power density; the lightweight integrated structure greatly reduces the weight of the rotor, and at the same time, by eliminating the gaps between the magnetic blocks and the physical connection points, it greatly improves the structural reliability and magnetic circuit efficiency. This structural setting enables the motor to achieve comprehensive improvements in power output, energy efficiency conversion, and operational stability.

[0019] (2) The annular cylinder and the fixed sleeve are connected together through evenly distributed reinforcement ribs to form a spatial truss-type load-bearing structure. This design reduces weight while increasing the rotor speed. The radial extension characteristics of the reinforcement ribs also optimize the centrifugal force transmission path and prevent plastic deformation of the plastic parts at high speeds. In addition, the connection between the solid sleeve and the annular cylinder through the reinforcement ribs significantly reduces the weight of the plastic parts, further achieving the lightweight requirements of the rotor.

[0020] (3) The reinforcing ribs extend radially to the bottom surface of the support plate and protrude downward to form a blade structure, which cleverly utilizes the centrifugal airflow generated by the rotation of the rotor itself. This integrated heat dissipation design does not require additional fan components and can achieve forced convection of air inside the shell, thereby reducing the temperature inside the shell without increasing any rotational inertia.

[0021] (4) By injection molding the plastic part and the rotor shaft in one step, a base structure with precise dimensions and stable mechanical properties is constructed. Subsequently, the annular permanent magnet is tightly bonded to the molded plastic part - the rotor shaft base through secondary injection molding to form a complete rotor assembly. This step-by-step molding process not only ensures a high-strength bond between the rotor shaft and the plastic part, but also achieves precise positioning and reliable fixation of the permanent magnet, greatly improving the structural strength and stability of the entire rotor.

[0022] (5) By providing a receiving groove for accommodating the mounting part on the rotor, the mounting part and the sealed bearing can occupy the internal space of the rotor without occupying a large space in the axial direction inside the housing, thereby improving the structural compactness of the motor and making the motor design lighter and thinner.

[0023] (6) By integrating a high-efficiency, energy-saving motor with a fan impeller, the fan achieves significantly improved performance advantages: the innovative high-power density motor rotor structure enables the fan to achieve stronger wind output; the integrated lightweight rotor significantly improves energy conversion efficiency while ensuring operational stability; and the unique heat dissipation structure design further enhances the fan's continuous working ability. The entire system achieves comprehensive improvements in wind performance, energy efficiency, and reliability through the optimized matching of the motor and impeller.

[0024] (7) When the rotor rotates at high speed, the blade structure centrifugally throws the hot air inside the housing toward the inner wall of the housing, achieving the first level of active heat dissipation. At the same time, the air ducts installed in the wheel cover direct the external airflow toward the outer wall of the housing when the impeller rotates, forming the second level of forced convection heat dissipation. This dual heat dissipation design, which works both inside and outside, generates continuous cooling airflow through the self-driven rotation of the rotor. Without adding additional heat dissipation components, it significantly improves the heat dissipation performance of the motor and ensures stable operation at high power output. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0026] Figure 1 This is an exploded schematic diagram of the motor disclosed in this application; Figure 2 This is an exploded schematic diagram of the rotor disclosed in this application; Figure 3 A schematic diagram of the three-dimensional structure of the fan disclosed in this application; Figure 4 This is an exploded schematic diagram of the fan disclosed in this application; Figure 5 This is a schematic diagram of the three-dimensional structure of the fan impeller disclosed in this application; Figure 6 This is a schematic diagram of the fan impeller and motor assembly structure disclosed in this application; Figure 7 A top view of the fan disclosed in this application; Figure 8 for Figure 7 Plane section view at AA in the middle; Reference numerals: 1. Housing; 2. Stator; 3. Rotor; 31. Rotor shaft; 32. Plastic parts; 33. Annular permanent magnet; 321. Annular cylinder; 322. Support plate; 3210. Embedding groove; 323. Fixing sleeve; 324. Reinforcement rib; 325. Blade structure; 11. Mounting part; 12. Sealed bearing; 320. Accommodating groove; 4. Fan impeller; 41. Wheel cover; 42. Rim; 43. Blade; 411. Air guide strip; 431. Transition structure; 5. Fan base; 51. Inner ring; 52. Outer ring; 53. Fixing rib. DETAILED DESCRIPTION

[0027] The following will be combined with the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0028] like Figure 1 As shown, combined Figure 5 The present application discloses a high-efficiency and energy-saving motor, comprising a housing 1, a stator 2 and a rotor 3 disposed inside the housing 1. The stator 2 is fixedly disposed inside the housing 1, and the rotor 3 is inserted into the stator 2. The rotor 3 comprises a rotor shaft 31, a plastic part 32, and an annular permanent magnet 33.

[0029] As the core support structure of rotor 3, rotor shaft 31 plays a key role in transmitting torque and maintaining mechanical strength. In this solution, rotor shaft 31 is directly integrated with plastic component 32, abandoning the traditional laminated silicon steel structure. The rigidity of the metal shaft core ensures the stability of the overall structure.

[0030] Plastic component 32 serves as the structural support for rotor 3, using engineering plastic to coat rotor shaft 31. Its core functions are reflected in three aspects: first, it replaces the support function of traditional silicon steel laminations, significantly reducing the weight of rotor 3 and thereby reducing energy consumption. Second, it provides thermal expansion compatibility with the metal shaft. Third, it acts as a non-magnetic medium in the magnetic circuit, blocking eddy currents. This design not only significantly reduces the weight of rotor 3, but its insulation properties also fundamentally address the eddy current losses caused by insulation failure between laminations.

[0031] The annular permanent magnet 33 is composed of a composite of magnetic powder and a binder, with alternating north / south poles achieved through a magnetic field orientation process. Compared to traditional segmented magnets, its continuous annular structure eliminates the ineffective gaps between the magnet segments, effectively improving the flux area utilization rate. This results in high magnetic flux and a stable magnetic effect, increasing the power energy density of the rotor 3 and, in turn, the motor's output. The uniform distribution of the magnetic powder makes the air gap flux density waveform more sinusoidal, effectively reducing torque ripple. The insulating properties of the binder further suppress eddy current losses under high-frequency operating conditions.

[0032] In this embodiment, the opposite orientation of magnetic powder in adjacent magnetic pole regions is achieved by alternating the circumferential orientation of the magnetic powder in these regions through an oriented magnetic field. Specifically, this is achieved through a magnetization process. This microscopic alignment of magnetic domains enables a single annular permanent magnet 33 to produce the same magnetic pole effect as a conventional multi-magnet assembly, while avoiding flux leakage caused by physical segmentation. This continuous gradient orientation transition of the magnetic powder significantly improves magnetic circuit continuity compared to the abrupt polarity transitions of discrete magnetic blocks.

[0033] The motor disclosed in this application achieves multiple technological breakthroughs through its innovative three-layer structure: rotor shaft 31 - plastic component 32 - annular permanent magnet 33. Plastic component 32 replaces traditional silicon steel sheets, completely eliminating eddy current losses and lamination process defects. The annular permanent magnet 33 not only achieves nearly 100% space utilization, but its evenly distributed magnetic powder, in an alternating orientation, produces high magnetic flux and a stable sinusoidal magnetic effect, significantly improving the power density of rotor 3. The lightweight, integrated structure significantly reduces the weight of rotor 3, while significantly improving structural reliability and magnetic circuit efficiency by eliminating gaps between magnetic blocks and physical connection points. This structural arrangement comprehensively improves the motor's power output, energy efficiency conversion, and operational stability, making it particularly suitable for high-speed, high-efficiency applications.

[0034] As some implementation methods, this embodiment shows a structural mode of the plastic part 32 . Specifically, the plastic part 32 includes an annular cylinder 321 , a support plate 322 , a fixing sleeve 323 and a reinforcing rib 324 .

[0035] The annular cylinder 321 serves as the main structure of the plastic component 32, providing a basic support framework for the entire rotor 3. The support plate 322, which extends outward from its bottom, increases the contact area with the annular permanent magnet 33 and forms an axial positioning reference. This integrated design significantly improves the overall rigidity of the rotor 3 structure.

[0036] Several embedding grooves 3210 are provided on the side wall of the annular cylinder 321 and the surface of the support plate 322. Thus, by providing protrusions on the inner wall and bottom surface of the annular permanent magnet 33, after the annular permanent magnet 33 is sleeved on the outside of the annular cylinder 321, the protrusions on the annular permanent magnet 33 can be embedded in the embedding grooves 3210, thereby achieving all-round radial and axial constraints on the annular permanent magnet 33, avoiding axial displacement of the annular permanent magnet 33 and the plastic part 32 when the rotor 3 rotates at high speed, and ensuring the structural stability of the annular permanent magnet 33 and the plastic part 32 after assembly.

[0037] The fixing sleeve 323 is located at the center of the annular cylinder 321. Several reinforcing ribs 324 are evenly distributed between the annular cylinder 321 and the fixing sleeve 323. The evenly distributed reinforcing ribs 324 connect the annular cylinder 321 and the fixing sleeve 323 into one, forming a spatial truss-like load-bearing structure. This design reduces weight while increasing the rotational speed of the rotor 3. The radial extension of the reinforcing ribs 324 also optimizes the centrifugal force transmission path, preventing plastic deformation of the plastic part 32 at high rotational speeds. In addition, the connection between the solid sleeve and the annular cylinder 321 is connected by the reinforcing ribs 324, which significantly reduces the weight of the plastic part 32, further achieving the lightweight requirements of the rotor 3.

[0038] In this embodiment, the fixing sleeve 323 is connected to the rotor shaft 31 using an interference fit, achieving precise concentric positioning. This design not only ensures reliable power transmission, but also effectively absorbs vibration energy during operation through the elastic deformation properties of the plastic material. Compared to a silicon steel sheet sleeved around the rotor shaft 31, the plastic fixing sleeve 323 also avoids the formation of eddy current circuits, further reducing stray losses.

[0039] In this embodiment, the reinforcing ribs 324 extend in the radial direction to the bottom surface of the support plate 322 and protrude downward to form a blade structure 325, cleverly utilizing the rotation of the rotor 3 itself to generate centrifugal airflow. This integrated heat dissipation design does not require additional fan components and can achieve forced convection of air inside the shell 1, thereby reducing the temperature inside the shell 1 without increasing any rotational inertia.

[0040] The integrated structural design achieves multiple optimizations: the annular cylinder 321 and support plate 322 form a stable mounting base, while the dual fixation of the embedded groove 3210 and support plate 322 ensures high-speed reliability of the magnet. The reinforcing ribs 324 significantly reduce weight while maintaining rigidity. The integrated blade structure 325 achieves efficient self-heating. This design combines structural strength, lightweight, and heat dissipation advantages, significantly improving overall performance.

[0041] In some embodiments, the plastic component 32 is joined to the rotor shaft 31 through an integral injection molding process. This allows the molten plastic to directly encapsulate the rotor shaft 31, forming a molecular bond. Compared to traditional mechanical connection methods (such as press-fit and keyways), this significantly improves torsional strength and completely eliminates the risk of relative displacement. Furthermore, the difference in damping properties between plastic and metal absorbs significant high-frequency vibration energy, reducing motor noise.

[0042] In some embodiments, the annular permanent magnet can be pre-manufactured and then assembled to the outside of the plastic part 32. However, such an assembly process will result in a fit gap between the annular permanent magnet 33 and the plastic part 32 after assembly. As a result, the annular permanent magnet 33 will be displaced relative to the plastic part 32 during high-speed rotation, which will affect the magnetic circuit performance.

[0043] In this embodiment, the annular permanent magnet 33 is integrally bonded to the outer periphery of the plastic part 32 through a secondary injection molding process. Specifically, in the actual manufacturing process, the rotor shaft 31 is first placed in a mold, and the plastic part 32 wrapping the rotor shaft 31 is obtained through a single injection molding process. Then, the rotor shaft 31 and the plastic part 32 are placed as a whole in another mold, and a secondary injection molding is performed in the mold by mixing magnetic powder and adhesive, thereby forming a metallurgical-grade bonding interface between the annular permanent magnet 33 and the plastic part 32, thereby greatly improving the bonding strength between the annular permanent magnet 33 and the plastic part 32.

[0044] After the injection molding of the three rotors is completed, the magnetic powder of the N-pole region and the S-pole region is alternately oriented along the circumferential direction through a directional magnetic field. Specifically, magnetization is performed above the annular permanent magnet 33 through a magnetizer. There is a magnetizing head corresponding to each magnetic pole region, and the polarities of adjacent magnetizing heads are opposite. The magnetizing heads apply a pulsed magnetic field.

[0045] Since the annular permanent magnet 33 needs to be subjected to secondary injection molding, in order to prevent the plastic part 32 from melting and mixing with the annular permanent magnet 33 during the secondary injection molding process, this embodiment adopts the following technical solution.

[0046] Specifically, the melting point of plastic component 32 is greater than that of annular permanent magnet 33. Plastic component 32 is made of PPS, which has a melting point of 330°C. During the actual injection molding process, the injection temperature is controlled at approximately 330°C. The magnetic powder in annular permanent magnet 33 is neodymium iron boron powder, and the binder is an epoxy resin or polyamide-based thermosetting material. The melting points of both materials are 260°C. Keeping the injection molding temperature lower than the PPS injection molding temperature ensures that plastic component 32 does not melt and flow during the injection molding process of annular permanent magnet 33, thereby ensuring a stable interface between annular permanent magnet 33 and plastic component 32 and preventing mixing of the two materials.

[0047] By injection-molding the plastic component 32 and rotor shaft 31 in a single process, a base structure with precise dimensions and stable mechanical properties is constructed. Subsequently, a secondary injection molding process tightly bonds the annular permanent magnet 33 to the already formed plastic component 32-rotor shaft 31 base, forming the complete rotor 3 assembly. This multi-step molding process ensures a high-strength bond between the rotor shaft 31 and the plastic component 32 while also enabling precise positioning and reliable fixation of the permanent magnet, significantly enhancing the structural strength and stability of the entire rotor 3.

[0048] In this embodiment, a mounting portion 11 is provided on the inner bottom surface of the housing 1, and a sealed bearing 12 connected to the rotor shaft 31 is provided in the mounting portion 11. The sealed bearing 12 can realize the rotational seal at the connection between the rotor shaft 31 and the housing 1. The top surface of the plastic part 32 is recessed to form a receiving groove 320, and the mounting portion 11 is received in the receiving groove 320. Thus, by providing the receiving groove 320 for accommodating the mounting portion 11 on the rotor 3, the mounting portion 11 and the sealed bearing 12 can occupy the internal space of the rotor 3, and there is no need to occupy a large space in the axial direction inside the housing 1, thereby improving the structural compactness of the motor and making the motor design lighter and thinner.

[0049] This embodiment also discloses a high-efficiency energy-saving fan, including a fan impeller 4 and the motor disclosed in the above embodiment, wherein the fan impeller 4 includes a wheel cover 41, a rim 42 and blades 43, wherein the rim 42 is coaxially sleeved on the outside of the wheel cover 41, and a plurality of blades 43 are provided, which are evenly arranged on the outer peripheral side of the wheel cover 41 and fixedly connected to the rim 42, wherein the wheel cover 41 is coaxially sleeved outside the housing 1, and one end of the rotor shaft 31 extending out of the housing 1 is fixedly connected to the wheel cover 41.

[0050] Multiple blades 43 are evenly distributed around the periphery of the wheel guard 41 and fixedly connected to the rim 42, ensuring efficient airflow while also enhancing the overall structural strength of the impeller through the rim 42. This layout optimizes aerodynamic efficiency and, through the covering effect of the wheel guard 41, reduces the risk of external moisture directly contacting the housing 1. This reduces the risk of moisture entering the housing 1 through the connection between the rotor shaft 31 and the housing 1, thereby improving the motor's waterproof performance.

[0051] By integrating a high-efficiency, energy-saving motor with the fan impeller 4, the fan boasts significantly enhanced performance advantages: The innovative, high-power-density motor rotor 3 structure delivers stronger wind output; the integrated, lightweight rotor 3 significantly improves energy conversion efficiency while ensuring operational stability; and the unique heat dissipation structure further enhances the fan's continuous operation. The entire system, through the optimized matching of the motor and impeller, achieves comprehensive improvements in wind performance, energy efficiency, and reliability.

[0052] As some embodiments, the inner top surface and inner side wall of the wheel cover 41 are evenly provided with multiple air guide strips 411 around the central axis of the wheel cover 41, and the air guide strips 411 are used to centrifugally guide the airflow in the wheel cover 41 to the outer wall of the shell 1.

[0053] In this embodiment, the blade structure 325 on the rotor 3 centrifugally flings the hot air in the housing 1 toward the inner wall of the housing 1 when rotating at high speed, achieving the first level of active heat dissipation; at the same time, the air guide strips 411 provided in the wheel cover 41 direct the external airflow toward the outer wall of the housing 1 when the impeller rotates, forming a second level of forced convection heat dissipation. This dual heat dissipation design that works internally and externally generates continuous cooling airflow through the self-driven rotation of the rotor 3, significantly improving the heat dissipation performance of the motor without adding additional heat dissipation components, ensuring stable operation at high power output. The innovative airflow guiding structure enables the motor to achieve cooling efficiency that exceeds that of traditional heat dissipation solutions while maintaining a compact design.

[0054] In the above embodiment, the air guide strips 411 on the inner top surface and side walls of the wheel cover 41 can not only guide the airflow to blow toward the outer surface of the shell 1, but also improve the structural strength of the wheel cover 41.

[0055] In some embodiments, an outwardly extending transition structure 431 is formed at the connection between the blade 43 and the rim 42 , and the end of the transition structure 431 is deflected outward by 0.5°±0.1° relative to the chord length direction of the blade 43 .

[0056] The unique deflection angle of transition structure 431 optimizes airflow guidance, creating a more concentrated, directional flow at the blade tips. The precise 0.5°±0.1° deflection design effectively reduces airflow separation losses while ensuring structural strength. The smooth connection of transition structure 431 to rim 42 eliminates vortices generated at traditional right-angle connections, resulting in smoother output airflow. These sophisticated aerodynamic improvements significantly increase air pressure and air delivery efficiency while maintaining the fan's original dimensions.

[0057] Some embodiments further include a fan base 5 comprising an inner ring 51, an outer ring 52, and fixing ribs 53. The fixing ribs 53 are evenly distributed on the outside of the inner ring 51 and fixedly connected to the outer ring 52. The inner ring 51 is fixedly connected to the motor housing 1. The fan base 5 is used to secure the motor and provide a mounting base for the fan and other devices or components. The arrangement of the inner ring 51, outer ring 52, and fixing ribs 53 gives the fan base 5 a structure similar to that of the plastic component 32, significantly reducing the weight of the entire fan.

[0058] In this embodiment, the deflection direction of the fixed fins 53 is opposite to that of the blades 43. The counter-rotating fixed fins 53 and fan blades 43 form complementary airflow control, effectively suppressing eddy current losses generated by the rotating airflow. The unique layout of the fixed fins 53 also creates a highly efficient flow channel. The base structure and the counter-rotating design of the blades 43 work together to reduce air resistance while significantly improving airflow organization efficiency. This overall optimized design significantly improves the fan system's operational stability and aerodynamic performance, while maintaining excellent heat dissipation characteristics.

[0059] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A high-efficiency energy-saving motor, comprising a housing (1) and a stator (2) and a rotor (3) arranged inside the housing (1), characterized in that: The rotor (3) comprises a rotor shaft (31), a plastic part (32) and an annular permanent magnet (33); the plastic part (32) is fixedly wrapped around the outer periphery of the rotor shaft (31); the annular permanent magnet (33) is fixedly arranged on the outer periphery of the plastic part (32); the annular permanent magnet (33) is composed of a composite of magnetic powder and a binder, and has N-pole regions and S-pole regions alternately distributed in the circumferential direction, and the magnetic powders of adjacent magnetic pole regions are oriented in opposite directions.

2. The high-efficiency energy-saving motor according to claim 1, characterized in that: The plastic part (32) comprises an annular cylinder (321), and the bottom edge of the annular cylinder (321) extends outward to form a support plate (322); The annular permanent magnet (33) is fixedly arranged on the outside of the annular cylinder (321) and connected to the support plate (322); a plurality of embedded grooves (3210) connected to the annular permanent magnet (33) are provided on the side wall of the annular cylinder (321) and the surface of the support plate (322); A fixing sleeve (323) is provided on the central axis of the annular cylinder (321), the rotor shaft (31) is inserted into the fixing sleeve (323) and fixedly connected to the fixing sleeve (323), and a plurality of reinforcing ribs (324) are evenly provided between the annular cylinder (321) and the fixing sleeve (323); The reinforcing ribs (324) extend in the radial direction to the bottom surface of the support plate (322) and protrude downward to form blade structures (325) for centrifugally throwing the hot air inside the shell (1) toward the inner wall of the shell (1).

3. The high-efficiency energy-saving motor according to claim 1, characterized in that: The plastic part (32) and the rotor shaft (31) are combined through an integral injection molding process.

4. The high-efficiency energy-saving motor according to claim 3, characterized in that: The annular permanent magnet (33) is integrally combined with the outer circumference of the plastic part (32) through a secondary injection molding process, and the N-pole region and the S-pole region are oriented alternately along the circumferential direction by a directional magnetic field.

5. The high-efficiency energy-saving motor according to claim 4, characterized in that: The melting point of the plastic part (32) is greater than the melting point of the annular permanent magnet (33), the plastic part (32) is made of PPS material, the magnetic powder in the annular permanent magnet (33) is neodymium iron boron powder, and the binder is epoxy resin or polyamide thermosetting material.

6. The high-efficiency energy-saving motor according to claim 1, characterized in that: The housing (1) is provided with a mounting portion (11) on the inner bottom surface, a sealed bearing (12) connected to the rotor shaft (31) is provided in the mounting portion (11), and a top surface of the plastic part (32) is recessed to form a receiving groove (320), and the mounting portion (11) is received in the receiving groove (320).

7. A high-efficiency energy-saving fan, comprising a fan impeller (4) and a high-efficiency energy-saving motor according to any one of claims 2 to 6, characterized in that: The fan impeller (4) comprises a wheel cover (41), a wheel rim (42) and blades (43); the wheel rim (42) is coaxially sleeved on the outside of the wheel cover (41); a plurality of blades (43) are provided, evenly arranged on the outer periphery of the wheel cover (41) and fixedly connected to the wheel rim (42); the wheel cover (41) is coaxially sleeved outside the housing (1), and one end of the rotor shaft (31) extending out of the housing (1) is fixedly connected to the wheel cover (41).

8. The high-efficiency energy-saving fan according to claim 7, characterized in that: The inner top surface and inner side wall of the wheel cover (41) are evenly provided with a plurality of air guide strips (411) around the central axis of the wheel cover (41), and the air guide strips (411) are used to centrifugally guide the airflow in the wheel cover (41) toward the outer wall of the housing (1).

9. The high-efficiency energy-saving fan according to claim 7, characterized in that: A transition structure (431) extending outward is formed at the connection between the blade (43) and the rim (42), and the end of the transition structure (431) is deflected outward by 0.5°±0.1° relative to the chord length direction of the blade (43).

10. The high-efficiency energy-saving fan according to claim 7, characterized in that: The motor further comprises a fan base (5), the fan base (5) comprising an inner ring (51), an outer ring (52) and fixed ribs (53), the fixed ribs (53) being evenly distributed outside the inner ring (51) and fixedly connected to the outer ring (52), the inner ring (51) being fixedly connected to the motor housing (1), and the deflection direction of the fixed ribs (53) being opposite to the deflection direction of the blades (43).

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