Small low-cost high-speed brushless motor

Abstract

The utility model relates to the technical field of motors, and particularly discloses a small-sized low-cost high-speed brushless motor, which comprises a frame body and a motor component accommodated in the frame body, and the motor component comprises a shaft body part matched with the frame body, a rotor assembly, a stator assembly and an impeller. The stator assembly is fixedly arranged on the frame body, the shaft body piece is sleeved with the impeller, the rotor assembly is in running fit with the stator assembly, and the rotor assembly is connected with the impeller so that the rotating impeller can push air to flow; the frame body is made of first plastic, and the impeller is made of second plastic. The small-sized low-cost high-speed brushless motor is simple in structure, low in manufacturing cost and suitable for products with limited space through the compact frame body design and the cooperation of the efficient stator assembly and the efficient rotor assembly.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field especially discloses a small -size low -cost high -speed brushless motor. BACKGROUND

[0002] With the progress of science and technology and the increasing requirement of society to energy saving and environmental protection, various high -efficient, low -power electric equipment has been widely applied. In the industry, household appliances, transportation tools and many other fields, brushless motor gradually becomes the mainstream driving device because of its high efficiency, low maintenance, long service life and other advantages. The brushless motor in the prior art still faces a series of challenges in application, such as large size, high cost, large noise, heat dissipation problem etc., especially in the application occasion of miniaturization, low cost and high efficiency, there is still optimization space. SUMMARY

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the utility model is to provide a small -size low -cost high -speed brushless motor.

[0004] In order to achieve the above-mentioned purpose, a small -size low -cost high -speed brushless motor of the utility model, including frame body, the motor component of containing in frame body, the motor component includes with frame body cooperation's shaft body spare, rotor assembly, stator assembly and impeller;Stator assembly is fixedly arranged on the frame body, the impeller is sleeved on the shaft body spare, rotor assembly and stator assembly rotate and cooperate, rotor assembly connects impeller to make the rotating impeller push air flow;Frame body is made of first plastic, and the impeller is made of second plastic.

[0005] The small -size low -cost high -speed brushless motor of the utility model can realize efficient air flow by adopting compact structure design and efficient stator, rotor cooperation. The frame body of the motor is made of durable plastic material, which has low manufacturing cost, and at the same time, compared with the metal frame body (generally using materials such as zinc, density: 7.14 grams per cubic centimeter) of the prior design, the lightweight of the motor is guaranteed. The efficient cooperation of rotor assembly and stator assembly makes the impeller rotate stably and push air flow, which helps to improve the heat dissipation effect and prolong the service life of the motor. The impeller is made of second plastic material, which has lower processing and molding cost and higher processing and molding speed compared with the metal impeller (generally made of aluminum or magnesium alloy, which needs to be carved and cannot be batch molded) of the prior design, and further reduces the energy consumption and noise of the motor, which is suitable for small household appliances, fans and portable devices and other application scenarios with space and cost requirements, and has good market prospect.

[0006] Further, the frame body is made of PPS plastic, and the impeller is made of nylon plastic. The frame body has a wall thickness of 1.0 to 2.5 mm, and the outer peripheral surface of the frame body is circular with a diameter of ≤25 mm. The frame can be formed of PPS material; PPS material has excellent high-temperature resistance and can withstand temperatures up to 250°C or higher, allowing the motor to operate stably under high load or high-temperature environments, avoiding material softening or performance degradation due to excessive temperature. PPS has good corrosion resistance and insulation, and the metal frame also needs to have a discharge terminal on the motor, and the frame made of PPS material does not need to place the discharge terminal, further reducing the overall production process and components.

[0007] The impeller has nine fan blades symmetrically and uniformly distributed at the center. The impeller is made of nylon material. Through experimental comparison and analysis, the performance is best when the number of fan blades is nine. If the number of fan blades is set to seven, eight, eleven, or thirteen, it will affect the wind pressure, wind speed, and noise level under the same conditions. At the same time, if the number of fan blades is greater than nine, it will also increase the difficulty of mold removal and processing cost. The design of nine fan blades enables the impeller to generate more uniform and powerful airflow, improving the efficiency of air flow. This design can effectively reduce vortex and ensure smooth air guidance into the motor or equipment, thereby improving heat dissipation performance. Nylon material is lighter than metal material, and using nylon to manufacture the impeller can reduce the overall weight of the motor and lower energy consumption, especially in applications requiring rapid acceleration and deceleration. Nylon has good toughness and impact resistance, and can withstand certain mechanical impact during high-speed operation of the motor without being easily damaged, ensuring the long-term stability and safety of the impeller. The good toughness and elasticity of nylon material help to reduce vibration and noise during operation, further improving the working environment of the motor, especially when combined with sound-absorbing materials, which can effectively reduce the overall noise level.

[0008] The frame body is integrally formed with an outer cylinder, an inner cylinder arranged in the outer cylinder, and a flow guide connecting plate located between the outer cylinder and the inner cylinder. The outer cylinder, the inner cylinder, and the flow guide connecting plate together form a first air duct. The stator assembly is arranged in the inner cylinder, and the rotor assembly is rotatably arranged in the stator assembly. The rotor assembly has a shaft member connected to the impeller, and the impeller is located in the outer cylinder.

[0009] The rotor assembly includes a permanent magnet ring, a first bearing, a bearing separator, and a second bearing. The bearing separator is arranged between the first bearing and the second bearing. The first bearing and the second bearing are arranged on the inner cylinder. The stator core of the stator assembly surrounds the permanent magnet ring. The first bearing and the second bearing are located on the same side of the permanent magnet ring.

[0010] In combination Figure 3As shown, the rotor assembly structure is a cantilever beam structure motor, which includes a permanent magnet ring, a first bearing, a bearing separator and a second bearing sleeved on the shaft member. The bearing separator effectively separates the first bearing from the second bearing, ensuring the balance and smooth rotation of the rotor assembly. The first bearing and the second bearing are arranged on the inner cylinder, providing better support and stability for the rotor. The stator core of the stator assembly is arranged around the permanent magnet ring, further enhancing the effectiveness of the magnetic field, optimizing the interaction between the rotor and the stator, and improving the working efficiency and durability of the motor. In combination Figure 8 As shown, the inner cylinder is provided with a first bearing mounting chamber at one end, and the first bearing and the second bearing are assembled in the first bearing mounting chamber. This is the first structure and assembly method of the rotor assembly, which is more suitable for applications that require lightweight, compact design and lower friction, especially for small and low-cost motor requirements.

[0011] In combination Figure 4 As shown, the rotor assembly includes a first bearing, a permanent magnet ring and a second bearing sleeved on the shaft member. The first bearing and the second bearing are arranged on both sides of the permanent magnet ring. The stator core of the stator assembly is arranged around the permanent magnet ring and located between the first bearing and the second bearing.

[0012] This rotor assembly structure is a two-end distributed bearing mounting structure motor, with two bearings located at both ends of the permanent magnet ring. The second bearing is assembled in the first bearing mounting chamber, and the inner cylinder is provided with a detachable end cover. In combination Figure 9 As shown, the end cover is annular with a second through hole for the shaft member to pass through. The second bearing mounting chamber is arranged in communication with the second through hole, and the first bearing is mounted in the second bearing mounting chamber. This structure can provide uniform support to the rotor, reduce the deviation or imbalance of the rotor during operation, and improve the rotation accuracy and stability of the rotor. This structure has stronger load capacity for the shaft member, and is suitable for applications that require higher load capacity and long-term operation. This is the second structure of the rotor assembly, which is more suitable for applications that require high running accuracy and load capacity, such as long-term high-load operation motors, which can provide better stability and uniform stress. The end cover is also provided with a plurality of third through holes arranged around the axis, for the passage of stator core winding power supply leads.

[0013] The brushless motor also includes a circuit control component, which includes an insulating sheath and a circuit control board contained in the insulating sheath. The circuit control component is connected to the other end of the stator assembly away from the impeller.

[0014] By using the insulating sheath, the circuit control components can effectively protect the circuit board from the external environment (such as moisture, dust, etc.), prevent short circuit or damage, and thus improve the stability and reliability of the motor. The circuit control board is housed in the insulating sheath, which can make the entire motor circuit control system more compact, avoiding increasing the size or complexity of the motor, and adapting to the design requirements of small motors. The design of the circuit control components helps to control the heat accumulation inside the motor, especially when the circuit control board is away from the other end of the impeller, which helps to avoid the influence of high temperature on the circuit control system and ensures its long-term stable operation.

[0015] The impeller includes a hub, a plurality of sets of blades arranged around the hub, and a conical air guide head protruding from one end of the hub. The second air duct is formed between the adjacent two blades, and the second air duct corresponds to the first air duct. The blades of the impeller are completely located in the outer cylinder. At least a part of the conical air guide head protruding from one end of the hub protrudes from the outer cylinder of the frame body, effectively guiding the airflow and reducing the airflow resistance. The plurality of sets of blades form an air inlet channel, and the rotation of the impeller drives the air to flow away from the end of the impeller. The rotation of the impeller drives the air to flow away from the end of the impeller, thereby providing stronger airflow output. The air pushing effect of the impeller can effectively enhance the air circulation inside the motor or around the equipment, help to reduce the working temperature of the motor, prevent overheating, and improve the operating life of the motor.

[0016] The frame body further comprises a flow guide connecting plate and an inner cylinder, both of which protrude from the outer cylinder. The length of the outer cylinder is relatively shorter. This structure can more effectively utilize the air ducts (first air duct and second air duct), thereby reducing the mass and compact structure of the entire motor.

[0017] The combination of the flow guide connecting plate and the inner cylinder can guide the airflow and make the airflow more evenly distributed inside the motor, avoiding poor air flow or local blockage, improving the heat dissipation effect and cooling efficiency of the motor. The installation cavity formed on the inner side of the inner cylinder can effectively protect the stator assembly from the external environment (such as dust, moisture, etc.), thereby increasing the durability and reliability of the motor. The structure of the flow guide connecting plate and the inner cylinder enhances the overall rigidity of the frame body, ensuring the stability of the motor components and reducing the impact of vibration during high-speed operation.

[0018] The flow guide connecting plate is provided with an inclined portion protruding from the end of the outer cylinder. The inclined portion is located at the end of the flow guide connecting plate close to the inner cylinder and at the end of the flow guide connecting plate away from the impeller. This inclined portion effectively guides the airflow, reduces the airflow resistance and improves the flow efficiency of the airflow. This design can optimize the airflow path, enhance the heat dissipation performance of the motor, and improve the stability and working efficiency of the motor.

[0019] The inner cylinder has two end openings, one end opening is large to form a stator mounting cavity, and the other end opening is small and extends radially inward to form a first end wall, the first end wall has a first bearing mounting cavity in the center, a first through hole coaxial with the stator mounting cavity and communicating with the stator mounting cavity is provided for the shaft member to extend out, and a plurality of heat dissipation holes are distributed in a ring shape around the first through hole and communicate with the stator mounting cavity to form a third air duct.

[0020] The first air duct and the second air duct mainly ensure smooth air flow through the motor, provide high-speed airflow to meet the air supply requirements of hair dryer or vacuum cleaner products. The design of the third air duct is mainly used to improve the air flow of the stator assembly, further enhance the heat dissipation effect, through these heat dissipation holes, hot air is guided out, effectively avoiding the influence of high temperature on the performance of the motor. Through the effective design of the three air ducts, the air flow of the motor is optimized, ensuring the cooling and heat dissipation of each component, improving the running stability and life of the motor.

[0021] The frame body is injection molded from a raw material mixed with sound-absorbing material, which can reduce the noise generated during the operation of the motor. The sound-absorbing material is black color master powder, which changes the frame body from white to black. The black color master powder can absorb light and noise. As a component of sound-absorbing material, black master powder can effectively absorb the noise generated during the operation of the motor. By absorbing sound waves in the air, black color master powder can significantly reduce high-frequency noise and improve the quiet performance of the motor, especially at high speed or under load. Black color master powder can absorb more light and heat, helping to reduce the temperature of the motor during operation. Black color master powder helps to reduce the influence of external light on the internal temperature of the motor and improves the heat dissipation performance of the motor by absorbing heat and distributing heat more evenly.

[0022] The beneficial effects of the utility model are as follows: the small low-cost high-speed brushless motor of the utility model can efficiently drive air flow while reducing noise and prolonging the service life of the motor through compact frame body design, efficient stator and rotor assembly cooperation, and optimized impeller structure. The motor uses PPS material and nylon impeller, providing excellent high-temperature resistance, corrosion resistance, lightweight, and high toughness, ensuring stable operation of the motor under high load and high temperature environment. The sound-absorbing material and optimized flow guide structure further reduce noise, improve heat dissipation efficiency, enhance the overall stability and reliability of the motor, and are suitable for applications with limited space and low cost, widely used in small household appliances, fans, and portable devices. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0024] Figure 2 It is a sectional view of the overall structure of the utility model;

[0025] Figure 3Structure schematic view of the first embodiment of the rotor assembly of the utility model;

[0026] Figure 4 Structure schematic view of the second embodiment of the rotor assembly of the utility model;

[0027] Figure 5 Structure schematic view of the frame body of the utility model;

[0028] Figure 6 Structure schematic view of the impeller of the utility model;

[0029] Figure 7 Structure schematic view of the impeller and the frame body of the utility model;

[0030] Figure 8 Structure schematic view of the frame body from another perspective of the utility model;

[0031] Figure 9 Structure schematic view of the end cover of the utility model.

[0032] The reference signs include:

[0033] 1, frame body; 2, motor part; 3, shaft body; 4, stator assembly; 400, rotor assembly; 5, impeller; 6, permanent magnet ring; 7, first bearing; 8, bearing separator; 9, second bearing; 12, insulation sheath; 13, circuit control board; 14, hub; 15, fan blade; 16, flow guide connecting plate; 17, inner cylinder; 100, outer cylinder; 110, first air duct; 111, second air duct; 112, third air duct; 113, stator mounting cavity; 114, first end wall; 115, bearing mounting cavity; 116, first through hole; 117, heat dissipation hole; 120, inclined portion; 130, conical air guide head; 140, end cover; 141, second through hole; 142, second bearing mounting chamber; 143, third through hole. DETAILED DESCRIPTION

[0034] In order to facilitate the understanding of those skilled in the art, the utility model will be further described below in conjunction with the embodiments and drawings, and the content mentioned in the embodiments is not a limitation of the utility model.

[0035] Please refer to Figures 1 to 8The utility model discloses a small -size low -cost high -speed brushless motor, including frame body 1, the motor component 2 of containing in frame body 1, the motor component 2 includes with the shaft body piece 3 of cooperation of frame body 1, rotor assembly 400, stator assembly 4 and impeller 5, stator assembly 4 is fixedly arranged on frame body 1, impeller 5 is sleeved on the shaft body piece 3, rotor assembly 400 is rotated with stator assembly 4 cooperation, rotor assembly 400 is connected impeller 5 to make the impeller 5 of rotation push air flow, frame body 1 adopts first plastic to make, impeller 5 adopts second plastic to make.

[0036] The utility model discloses a small -size low -cost high -speed brushless motor passes through adopting compact structure design and high -efficient stator, rotor cooperation, can realize high -efficient air flow. The frame body 1 of motor is made of durable plastic material, has lower manufacturing cost, guarantees the light weight of motor relative to the metal frame body (generally uses material such as zinc, density: every cubic centimeter 7.14 grams) of prior art design. The efficient cooperation of rotor assembly 400 and stator assembly 4 makes impeller 5 can rotate stably, push air flow, help to improve the heat dissipation effect and prolong the service life of motor. Impeller 5 adopts second plastic material, relative to the metal impeller (generally adopts aluminum or magnesium alloy, needs to carry out fine carving technology and can not batch mould copy) of prior art design, the processing cost of forming is reduced, the processing speed of forming is improved, the energy consumption and noise of motor are further reduced simultaneously, is applicable to the application scene such as small -size household appliance, fan and portable equipment with the requirement of space and cost, has good market prospect.

[0037] Further, frame body 1 is made of PPS plastic, and impeller 5 is made of nylon plastic. The wall thickness of the frame body 1 is 1.0 to 2.5 mm, and the outer peripheral surface of the frame body 1 is circular with a diameter of less than or equal to 25 mm. The frame can be formed of PPS material. The PPS material has excellent high-temperature resistance and can withstand temperatures of up to 250°C or higher, so that the motor can still work stably under high load or high-temperature environment, avoiding material softening or performance degradation of the motor due to excessive temperature. The PPS material has good corrosion resistance and insulation, and the metal frame needs to have a discharge terminal on the motor. The frame made of PPS material does not need to have a discharge terminal, and the overall production process and components are further reduced.

[0038] The nine fan blades 15 of the impeller 5 are uniformly distributed symmetrically around the center. The impeller 5 is made of nylon material. Through experimental comparison and analysis, it is found that the performance is best when the number of fan blades 15 is nine. If the number of fan blades 15 is set to seven, eight, eleven, or thirteen, the wind pressure, wind speed, and noise level will be affected under the same conditions. Meanwhile, if the number of fan blades 15 is greater than nine, it will also increase the difficulty of mold release and processing cost. The design of nine fan blades 15 enables the impeller 5 to generate more uniform and powerful airflow, improving the flow efficiency of air. This design can effectively reduce vortex, ensuring that air is smoothly guided into the motor or equipment, thereby improving the heat dissipation performance. Nylon material is lighter than metal material. Using nylon to manufacture the impeller 5 can reduce the weight of the entire motor, lower energy consumption, especially in applications requiring rapid acceleration and deceleration. Nylon has good toughness and impact resistance, which can withstand certain mechanical impact during high-speed operation of the motor without being easily damaged, ensuring the long-term stability and safety of the impeller 5. The good toughness and elasticity of nylon material help to reduce vibration and noise during operation, further improving the working environment of the motor, especially when combined with sound-absorbing materials, which can effectively reduce the overall noise level.

[0039] The frame body 1 is integrally formed with an outer cylinder 100, an inner cylinder 17 arranged in the outer cylinder 100, and a flow guide connecting plate 16 located between the outer cylinder 100 and the inner cylinder 17. The outer cylinder 100, the inner cylinder 17, and the flow guide connecting plate 16 collectively form a first air duct 110. The stator assembly 4 is arranged in the inner cylinder 17, and the rotor assembly 400 is rotatably arranged in the stator assembly 4. The rotor assembly 400 has a shaft member 3 connected to the impeller 5, and the impeller 5 is located in the outer cylinder 100.

[0040] The rotor assembly 400 includes a permanent magnet ring 6, a first bearing 7, a bearing separator 8, and a second bearing 9, which are arranged on the shaft member 3. The bearing separator 8 is arranged between the first bearing 7 and the second bearing 9. The first bearing 7 and the second bearing 9 are arranged on the inner cylinder 17. The stator core of the stator assembly 4 surrounds the permanent magnet ring 6. The first bearing 7 and the second bearing 9 are located on the same side of the permanent magnet ring 6.

[0041] In combination Figure 3 As shown, the rotor assembly 400 is a cantilever beam structure motor. The rotor assembly 400 includes a permanent magnet ring 6, a first bearing 7, a bearing separator 8, and a second bearing 9, which are arranged on the shaft member 3. The bearing separator 8 effectively separates the first bearing 7 and the second bearing 9, ensuring the balance and smooth rotation of the rotor assembly 400. The first bearing 7 and the second bearing 9 are arranged on the inner cylinder 17, providing better support and stability for the rotor. The stator core of the stator assembly 4 surrounds the permanent magnet ring 6, further enhancing the effectiveness of the magnetic field and optimizing the interaction between the rotor and the stator, improving the working efficiency and durability of the motor. In combination Figure 8As shown, the inner cylinder 17 is provided with a first bearing mounting chamber 115 at one end, and the first bearing 7 is assembled in the first bearing mounting chamber 115 together with the second bearing 9, which is the first structural arrangement and assembly method of the rotor assembly 400, and is more suitable for applications that require lightweight, compact design and lower friction, especially for the needs of small and low-cost motors.

[0042] In combination Figure 4 As shown, in another embodiment, the rotor assembly 400 includes a first bearing 7, a permanent magnet ring 6, and a second bearing 9, which are arranged on the shaft member 3, the first bearing 7 and the second bearing 9 are arranged on both sides of the permanent magnet ring 6, and the stator core of the stator assembly 4 is arranged around the permanent magnet ring 6 and between the first bearing 7 and the second bearing 9.

[0043] This rotor assembly 400 is a two-end distributed bearing mounting structure motor, two bearings are respectively located at both ends of the permanent magnet ring 6, and the second bearing 9 is assembled in the first bearing mounting chamber 115, and the end cover 140 is detachably arranged with the inner cylinder 17, in combination Figure 9 As shown, the end cover 140 is annular and has a second through hole 141 axially passing through the shaft member 3, and a second bearing mounting chamber 142 is arranged in communication with the second through hole 141, and the first bearing 7 is arranged in the second bearing mounting chamber 142, which can provide uniform support to the rotor, reduce the deviation or imbalance of the rotor during operation, and improve the rotation accuracy and stability of the rotor. This structure has stronger load capacity for the shaft member 3, and is suitable for applications that require higher load capacity and long-term operation. This is the second structural arrangement of the rotor assembly 400, which is more suitable for applications that require high running accuracy and load capacity, such as motors that run for a long time under high load, which can provide better stability and uniform stress. The end cover 140 is also provided with a plurality of third through holes 143 arranged around the axial line thereof, for the passage of power supply leads of the stator core winding.

[0044] The brushless motor also includes a circuit control component, which includes an insulating sheath 12 and a circuit control board 13 arranged in the insulating sheath 12. The circuit control component is connected to the other end of the stator assembly 4 away from the impeller 5.

[0045] By using the insulating sheath 12, the circuit control component can effectively protect the circuit board from the external environment (such as moisture, dust, etc.), prevent short circuit or damage, and improve the stability and reliability of the motor. The circuit control board 13 is arranged in the insulating sheath 12, which can make the circuit control system of the entire motor more compact, avoid increasing the size or complexity of the motor, and adapt to the design requirements of small motors. The design of the circuit control component helps to control the heat accumulation inside the motor, especially when the circuit control board 13 is away from the other end of the impeller 5, which helps to avoid the influence of high temperature on the circuit control system and ensures its long-term stable operation.

[0046] The impeller 5 includes a hub 14, a plurality of sets of blades 15 arranged around the hub 14, and a tapered air guide head 130 protruding from one end of the hub 14. A second air duct 111 is formed between two adjacent blades 15, corresponding to the first air duct 110. The blades 15 of the impeller 5 are completely located within the outer cylinder 100. At least a portion of the tapered air guide head 130 protruding from one end of the hub 14 protrudes from the outer cylinder 100 of the frame body 1, effectively guiding the airflow and reducing airflow resistance. The plurality of sets of blades 15 form an air inlet channel, and the rotation of the impeller 5 drives the air to flow away from the end of the impeller 5. The rotation of the impeller 5 effectively pushes the air away from the end of the impeller 5, thereby providing stronger airflow output. The air pushing effect of the impeller 5 can effectively enhance the air circulation inside the motor or around the equipment, helping to reduce the operating temperature of the motor, prevent overheating, and improve the operating life of the motor.

[0047] The flow guide connecting plate 16 and the inner cylinder 17 at the end of the frame body 1 away from the impeller 5 are arranged to protrude from the outer cylinder 100. The length of the outer cylinder 100 is relatively shorter, and this structure can more effectively utilize the air ducts (first air duct 110 and second air duct 111) to reduce the overall weight and compact structure of the motor.

[0048] The combination of the flow guide connecting plate 16 and the inner cylinder 17 can guide the airflow, making the airflow more evenly distributed to the inside of the motor, avoiding poor air flow or local blockage, and improving the cooling efficiency and cooling efficiency of the motor. The installation cavity formed on the inner side of the inner cylinder 17 can effectively protect the stator assembly 4 from external environment (such as dust, moisture, etc.), thereby increasing the durability and reliability of the motor. The structure of the flow guide connecting plate 16 and the inner cylinder 17 enhances the overall rigidity of the frame body 1, ensuring the stability of the motor assembly and reducing the impact of vibration during high-speed operation.

[0049] The flow guide connecting plate 16 is provided with an inclined portion 120 protruding from the end of the outer cylinder 100. The inclined portion 120 is located at the end of the flow guide connecting plate 16 close to the inner cylinder 17 and at the end of the flow guide connecting plate 16 away from the impeller 5. This inclined portion 120 effectively guides the airflow, reduces the airflow resistance and improves the flow efficiency of the airflow. This design can optimize the airflow path, enhance the heat dissipation performance of the motor, and improve the stability and working efficiency of the motor.

[0050] The inner cylinder 17 has two open ends, one end of which is large and forms a stator mounting cavity 113, and the other end of which is small and extends radially inward to form a first end wall 114, and the first end wall 114 has a first bearing mounting chamber 115 at the center, and the first bearing mounting chamber 115 is coaxial with the stator mounting cavity 113 and has a first through-hole 116 for the shaft member to extend out, and the first through-hole 116 is annularly distributed around the first through-hole 116 and has heat dissipation holes 117, and the heat dissipation holes 117 are in communication with the stator mounting cavity 113 to form a third air duct 112.

[0051] The first air duct 110 and the second air duct 111 mainly ensure smooth air flow through the motor, and provide high-speed air flow to meet the air supply requirements of hair dryer or dust collector products. The design of the third air duct 112 is mainly used to improve the air flow of the stator assembly 4 and further enhance the heat dissipation effect. Through these heat dissipation holes, hot air is guided out, effectively avoiding the influence of high temperature on the performance of the motor. Through the effective design of the three air ducts, the air flow of the motor is optimized, ensuring the cooling and heat dissipation of each component, and improving the operation stability and service life of the motor.

[0052] The frame body 1 is mixed with sound-absorbing material before being injection molded, and the sound-absorbing material can reduce the noise generated during the operation of the motor. The sound-absorbing material is black color master powder, which changes the frame body 1 from white to black, and the black color master powder can absorb light and noise. The black color master powder as a component of the sound-absorbing material can effectively absorb the noise generated during the operation of the motor. By absorbing sound waves in the air, the black color master powder can significantly reduce high-frequency noise and improve the quiet performance of the motor, especially at high speed or under load. The black material can absorb more light and heat, helping to reduce the temperature of the motor during operation. Mixing black color master powder in the frame body 1 helps to reduce the influence of external light on the internal temperature of the motor, and by absorbing heat, the heat is more evenly distributed, improving the heat dissipation performance of the motor.

[0053] The remaining parts of this embodiment are the same as those of Embodiment One, and the features not explained in this embodiment all adopt the explanations of Embodiment One, which will not be described here.

[0054] The above is only a preferred embodiment of the present application, and for those skilled in the art, according to the idea of the present application, the specific implementation and application range will be changed, and the content of the specification should not be understood as a limitation of the present application.

Claims

1. A small, low cost, high speed brushless motor characterized by: The application relates to a small-sized low-cost high-speed brushless motor, which comprises a frame body (1), a motor component (2) arranged in the frame body (1), wherein the motor component (2) comprises a rotor assembly (400) matched with the frame body (1), a stator assembly (4) and an impeller (5); the stator assembly (4) is fixedly arranged on the frame body (1), the impeller (5) is sleeved on a shaft body (3), the rotor assembly (400) is rotationally matched with the stator assembly (4), and the rotor assembly (400) is connected with the impeller (5) so that the rotating impeller (5) drives air flow; the frame body (1) is made of a first plastic, and the impeller (5) is made of a second plastic.

2. A small, low cost, high speed brushless motor according to claim 1, characterized in that: The frame body (1) is made of PPS plastic, and the impeller (5) is made of nylon plastic.

3. A small, low cost, high speed brushless motor according to claim 2, characterized in that: The frame body (1) is integrally formed with an outer cylinder (100), an inner cylinder (17) arranged in the outer cylinder (100) and a flow guide connecting plate (16) located between the outer cylinder (100) and the inner cylinder (17), and the outer cylinder (100), the inner cylinder (17) and the flow guide connecting plate (16) jointly form a first air duct (110); the stator assembly (4) is arranged in the inner cylinder (17), and at least a part of the rotor assembly (400) is rotationally arranged in the stator assembly (4); the rotor assembly (400) has the shaft body (3) connected with the impeller (5), and the impeller (5) is located in the outer cylinder (100).

4. A small, low cost, high speed brushless motor according to claim 3, characterized in that: The rotor assembly (400) comprises a permanent magnet ring (6) sleeved on the shaft body (3), a first bearing (7), a bearing separation piece (8) and a second bearing (9); the bearing separation piece (8) is arranged between the first bearing (7) and the second bearing (9); the first bearing (7) and the second bearing (9) are arranged on the inner cylinder (17); a stator core of the stator assembly (4) is arranged around the permanent magnet ring (6); and the first bearing (7) and the second bearing (9) are located on the same side of the permanent magnet ring (6).

5. A small, low cost, high speed brushless motor as defined in claim 3, characterized by: The rotor assembly (400) comprises a first bearing (7), a permanent magnet ring (6) and a second bearing (9) sleeved on the shaft body (3); the first bearing (7) and the second bearing (9) are respectively arranged on two sides of the permanent magnet ring (6); a stator core of the stator assembly (4) is arranged around the permanent magnet ring (6) and located between the first bearing (7) and the second bearing (9).

6. A small, low cost, high speed brushless motor as defined in claim 1, characterized by: The small-sized low-cost high-speed brushless motor further comprises a circuit control component, which comprises an insulation sheath (12) and a circuit control board (13) arranged in the insulation sheath (12); the circuit control component is connected with a free end of the stator assembly (4) away from the impeller (5).

7. A small, low cost, high speed brushless motor as defined in claim 3, characterized by: The impeller (5) comprises a hub (14) and a plurality of groups of fan blades (15) arranged around the hub (14); one end of the hub (14) forms a conical air guide head (130) protruding out of the fan blades (15); a second air duct (111) is formed between two adjacent fan blades (15); and the fan blades (15) of the impeller (5) are completely located in the outer cylinder (100).

8. A small, low cost, high speed brushless motor according to claim 3, characterized in that: The flow guide connecting plate (16) and the inner cylinder (17) of the frame body (1) away from the impeller (5) are arranged to at least partially protrude out of the outer cylinder (100).

9. A small, low cost, high speed brushless motor according to claim 8, characterized in that: The flow guide connecting plate (16) is provided with an inclined part (120) protruding from the end of the outer cylinder (100), which is located at one end of the flow guide connecting plate (16) close to the inner cylinder (17) and at one end of the flow guide connecting plate (16) away from the impeller (5).

10. A small, low cost, high speed brushless motor according to claim 3, characterized in that: The wall thickness of the outer cylinder (100) is 1.0-2.5 mm, the outer peripheral surface section of the outer cylinder (100) is circular, the circular diameter is ≤25 mm, and the frame body (1) is made of PPS plastic raw material mixed with black color master powder.

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