Stator, motor and electric tool
By designing an arc connection structure for the stator core and improving the bearing fixing method, the problem of miniaturization and weight reduction of the motor core was solved, achieving miniaturization and weight reduction of the motor, and reducing noise and vibration.
Patent Information
- Application Number
- CN202423081524.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-12-12
AI Technical Summary
Existing motor cores cannot be made very small due to the need to consider the size of the wire tip, making it difficult to achieve miniaturization and weight reduction.
Design a stator core by connecting multiple continuous and evenly divided yoke regions into a whole through a circular arc structure, eliminating the wire tip size, and bending it into a circular structure after winding the coil, while using a circular arc structure to avoid breakage and deformation.
This technology enables the miniaturization and weight reduction of the motor, increases power density, and reduces noise and vibration through improved bearing mounting methods.
Smart Images
Figure CN223540333U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of motor technology, specifically relating to a stator, a motor, and a power tool. Background Technology
[0002] With the rapid development of small household appliance technology and the continuous improvement of people's living standards, some power tools, such as vacuum cleaners, have become essential appliances in people's daily lives. Among them, handheld vacuum cleaners are favored by people due to their ease of cleaning, small footprint, and wide applicability. The motor industry has always been pursuing miniaturization and weight reduction, aiming to produce high-performance motors with the smallest possible size. However, existing motor cores are all complete circular structures. This structure requires consideration of the wire tip size during winding and necessitates leaving space for the wire tip, thus limiting the size and making miniaturization and weight reduction difficult. Utility Model Content
[0003] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a stator, motor and power tool to improve the existing motor core structure. Due to the need to consider the wire tip size, the winding size cannot be made very small, making it difficult to achieve miniaturization and weight reduction.
[0004] To achieve the above and other related objectives, this utility model proposes a stator, comprising:
[0005] The stator core includes multiple continuous and equally divided yoke regions, each yoke region having a tooth region.
[0006] Two adjacent yoke regions are connected into a whole by a connecting region, which is located on the outer circumference of the yoke region and has an arc structure.
[0007] A coil winding is wound on the toothed region, and multiple continuous and evenly divided yoke regions are bent along the connecting region to form a circular structure.
[0008] In a preferred embodiment of this utility model, the arc contour lines of the connecting area near the inner side of the circular structure and the arc contour lines near the outer side of the circular structure are concentric arcs.
[0009] In a preferred embodiment of this utility model, the arc contour line of the connecting area near the inner side of the circular structure is a superior arc, and the arc contour line near the outer side of the circular structure is a inferior arc.
[0010] In a preferred embodiment of this utility model, the radius of the arc contour line of the connecting area near the inner side of the circular structure is smaller than the radius of the arc contour line near the outer side of the circular structure.
[0011] In a preferred embodiment of the present invention, the two yoke regions located on both sides of a plurality of continuous and equally divided yoke regions are respectively a first yoke region and a second yoke region, wherein a first contour line of the first yoke region on the side away from the connecting region and a second contour line of the second yoke region on the side away from the connecting region are adapted to each other.
[0012] In a preferred embodiment of the present invention, a groove is provided on the side of the first yoke region away from the connecting region, and a protrusion is provided on the side of the second yoke region away from the connecting region, the protrusion being adapted to the groove.
[0013] In a preferred embodiment of the present invention, an insulating frame is further included, the insulating frame surrounding the stator, and the coil winding is wound around the insulating frame.
[0014] In a preferred embodiment of the present invention, a terminal for connecting the coil winding is further included, and the insulating frame, the terminal and the stator are integrally injection molded.
[0015] This utility model also proposes an electric motor, including a rotor and a stator, wherein the stator includes:
[0016] The stator core includes multiple continuous and equally divided yoke regions, each yoke region having a tooth region.
[0017] Two adjacent yoke regions are connected into a whole by a connecting region, which is located on the outer circumference of the yoke region and has an arc structure.
[0018] A coil winding is wound on the toothed region, and multiple continuous and evenly divided yoke regions are bent along the connecting region to form a circular structure.
[0019] This utility model also proposes an electric tool, including a motor, the motor comprising a rotor and a stator, the stator comprising:
[0020] The stator core includes multiple continuous and equally divided yoke regions, each yoke region having a tooth region.
[0021] Two adjacent yoke regions are connected into a whole by a connecting region, which is located on the outer circumference of the yoke region and has an arc structure.
[0022] A coil winding is wound on the toothed region, and multiple continuous and evenly divided yoke regions are bent along the connecting region to form a circular structure.
[0023] In a preferred embodiment of this utility model, the power tool is one of a vacuum cleaner, a hair dryer, a pruning machine, and a chainsaw.
[0024] This utility model proposes a stator, a motor, and an electric tool. The stator is divided into multiple continuous and evenly spaced yoke regions, each with a toothed region. Adjacent yoke regions are connected as a whole by a connecting region designed as an arc structure, located on the outer circumference of the yoke region. The stator has a straight-line structure. After winding the coil in the toothed region of the straight-line stator, it is bent and welded along the connecting region to form a complete circular stator structure. This eliminates the wire tip size of existing motor core structures, effectively reducing the core's size and weight, achieving motor miniaturization and weight reduction, and increasing the motor's power density. Simultaneously, the arc structure of the connecting region makes it less prone to breakage and deformation during bending. Attached Figure Description
[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0026] Figure 1 This is a schematic diagram of the unfolded stator structure in one embodiment of the present invention.
[0027] Figure 2 This is a three-dimensional schematic diagram of the stator unfolded in one embodiment of the present invention.
[0028] Figure 3 for Figure 1 Enlarged diagram of point A in the middle.
[0029] Figure 4 This is a schematic diagram of the stator and insulating frame in one embodiment of the present invention.
[0030] Figure 5 This is a schematic diagram of the stator winding in one embodiment of the present invention.
[0031] Figure 6 This is a schematic diagram of the stator after bending in one embodiment of the present invention.
[0032] Figure 7 This is a schematic diagram of the motor structure in one embodiment of the present invention.
[0033] Figure 8 This is a cross-sectional structural diagram of the motor in one embodiment of the present invention.
[0034] Figure 9 This is a schematic diagram of the motor housing in one embodiment of the present invention.
[0035] Figure 10 This is a cross-sectional schematic diagram of the motor housing in one embodiment of the present invention.
[0036] Figure 11 This is a schematic diagram of the shaft side structure of the motor fan in one embodiment of the present invention.
[0037] Figure 12 This is a front view schematic diagram of the motor fan in one embodiment of the present invention.
[0038] Figure 13 This is a schematic diagram of the included angle α between the motor and the fan in one embodiment of the present invention.
[0039] Figure 14 This is a schematic diagram of the included angle β of the motor and fan in one embodiment of the present invention.
[0040] Figure 15 This is a schematic diagram of the motor fan in one embodiment of the present invention from another angle.
[0041] Figure 16 This is a schematic diagram of the included angle γ of the motor fan in one embodiment of the present invention.
[0042] Figure 17 This is a schematic diagram of the motor structure in one embodiment of the present invention.
[0043] Figure 18 This is a cross-sectional schematic diagram of the motor in one embodiment of the present invention.
[0044] Figure 19 This is a schematic diagram of the structure of a vacuum cleaner in one embodiment of the present invention.
[0045] Label Explanation:
[0046] 100. Motor; 10. Motor fan blade; 11. Fan blade disc; 12. Fan blade; 111. Shaft hole; 121. Tail end; 122. Front end; 123. Inner side; 124. Outer side; 112. Large end; 113. Small end; 1221. First side; 1222. Second side; 1211. Third side; 1212. Fourth side; 20. Housing; 30. Bearing bracket; 311. Output shaft; 201. Bearing mounting chamber; 203. Rubber ring; 204. Rubber pad; Stator core 40; 41. Yoke 42. Toothed area; 43. Connecting area; 44. Coil winding; 431. First arc contour line; 432. Second arc contour line; 411. First yoke area; 412. Second yoke area; 401. First contour line; 402. Second contour line; 403. Groove; 404. Protrusion; 45. Insulating frame; 46. Terminal; 200. Vacuum cleaner; 210. Housing; 220. Dust collection unit; 230. Suction generating unit; 240. Air duct unit; 250. Floor brush. Detailed Implementation
[0047] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.
[0048] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show the components related to this utility model and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.
[0049] Understandably, bearings in existing motors are basically glued to the bearing housing. In this way, the bearing is completely fixed. If the bearing is not concentric, it is easy to increase the noise of the bearing during operation. At the same time, the heat generated during operation can also cause the glue to fail, resulting in the bearing detaching and losing its fixation, which in turn leads to motor failure. In addition, this fixing method allows the vibration of the motor to be transmitted to the outside of the motor through the bearing housing, resulting in the problem of high motor noise.
[0050] Please see Figures 1 to 6As shown, existing motor cores are all complete circular structures. This structure requires consideration of the wire tip size during winding, necessitating space for the wire tip, thus limiting the size and making miniaturization and weight reduction difficult. Therefore, this invention proposes a stator, motor, and power tool that, by modifying the stator core, eliminates the wire tip size limitation of existing motor core structures, achieving motor miniaturization and weight reduction. Specifically, the motor includes a rotor and a stator. The rotor can rotate around a rotation axis. The stator includes a stator core 40, which includes multiple continuous and evenly divided yoke regions 41. Each yoke region 41 has a toothed region 42. Adjacent yoke regions 41 are connected as a whole by a connecting region 43. A coil winding 44 is wound on the toothed region 42. The stator core 40 includes a pre-forming state, in which the multiple yoke regions 41 are arranged in a straight line, and adjacent yoke regions 41 are connected by the connecting region 43, so that the multiple yoke regions 41... To facilitate the winding of the coil winding 43, the coil winding 44 is wound on the tooth region 42 in this state. After multiple continuous and evenly divided yoke regions 41 are bent along the connecting region 43, they form a circular structure. The two yoke regions 41 located on both sides in the straight arrangement are welded and fixed to form the formed state, which is the formed stator. In the formed state, the coil winding 44 is wound on the tooth region 42 without considering the wire nozzle size and without reserving the wire nozzle position. This can effectively reduce the outer size and weight of the iron core, realize the miniaturization and weight reduction of the motor, and improve the power density of the motor.
[0051] See Figures 1 to 3 As shown, in this embodiment, the connecting region 43 is located on the outer circumference of the yoke region 41, and the connecting region 43 has an arc structure to facilitate bending and shaping of multiple yoke regions 41, and to prevent breakage and deformation during bending. In this embodiment, the first arc contour line 431 near the inner side of the circular structure and the second arc contour line 432 near the outer side of the circular structure are concentric arcs. Further, the first arc contour line 431 near the inner side of the circular structure is a dominant arc, for example, the first contour line is greater than or equal to three-quarters of an arc, and the second arc contour line 432 near the outer side of the circular structure is a minor arc, for example, the second contour line is less than or equal to one-quarter of an arc. Furthermore, the radius of the first arc contour line 431 near the inner side of the circular structure is smaller than the radius of the second arc contour line 432 near the outer side of the circular structure, so that the yoke region 41 can be bent into a circular structure.
[0052] Please see Figure 1 and Figure 2As shown, in this embodiment, the two yoke regions 41 located on either side of a plurality of continuous and evenly divided yoke regions 41 are respectively the first yoke region 411 and the second yoke region 412. The first contour line 401 on the side of the first yoke region 411 away from the connecting region 43 and the second contour line 402 on the side of the second yoke region 412 away from the connecting region are adapted to each other so that when the plurality of yoke regions 41 are bent into a circle, the first contour line 401 and the second contour line 402 can better fit together for welding, facilitating fixation and welding. In this embodiment, a groove 403 is provided on the side of the first yoke region 411 away from the connecting region 43, and a protrusion 404 is provided on the side of the second yoke region 412 away from the connecting region 43. The protrusion 404 is adapted to the groove 403. When the plurality of yoke regions 41 are bent into a circle, the protrusion 403 engages in the groove 403 and is welded and fixed to form the shape.
[0053] Please see Figure 1 , Figures 4 to 6 As shown, in this embodiment, the stator further includes an insulating frame 45 and a terminal 46 connecting the coil winding. The insulating frame 45 surrounds the stator, and the coil winding 44 is wound around the insulating frame 45. The insulating frame 45, the terminal 46, and the stator are integrally injection molded.
[0054] Please see Figures 1 to 6 As shown, in this embodiment, the stator forming process is as follows: multiple stator core laminations with yoke regions 41 arranged in a straight line can be formed by stamping or other methods. The stator core is formed by stacking multiple stator core laminations. The stator core is then injection molded as an insert. The insulating frame 45, the terminals 46, and the stator are integrally formed by injection molding. Then, a coil winding 44 is wound on the outside of the insulating frame 45 located in the tooth region 42. After winding, the multiple yoke regions 41 are bent along the connecting region 43 to form a circular structure. Finally, two yoke regions 41 located on both sides of the multiple yoke regions 41 are laser welded to form the formed stator core.
[0055] The above embodiment divides the stator into multiple continuous and evenly divided yoke regions, each with a toothed region. Adjacent yoke regions are connected into a whole by a connecting region designed as an arc structure, located on the outer circumference of the yoke region. The stator has a straight-line structure. After the coil winding is wound in the toothed region of the straight-line stator, it is bent and welded along the connecting region to form a complete circular stator structure. This eliminates the wire nozzle size of the existing motor core structure, effectively reducing the outer size and weight of the core, achieving motor miniaturization and weight reduction, and improving the power density of the motor. At the same time, the arc structure of the connecting region makes it less prone to breakage and deformation during bending.
[0056] Please see Figures 7 to 10 It is also understandable that bearings in existing motors are basically glued to the bearing housing. In this way, the bearing is completely fixed. If the bearing is not concentric, it is easy to increase the noise of the bearing during operation. At the same time, the heat generated during operation can also cause the glue to fail, resulting in the bearing detaching and losing its fixation, which in turn leads to motor failure. In addition, this fixing method allows the vibration of the motor to be transmitted to the outside of the motor through the bearing housing, resulting in high motor noise. Therefore, this utility model also proposes a new motor bearing fixing method to avoid motor failure due to bearing fixing failure, and can effectively reduce motor noise. Specifically, the motor 100 includes a housing 20, a rotor assembly and a stator assembly disposed in the housing 20, and a bearing bracket 30 located at the end of the rotor assembly away from the housing 20. The bearing is installed in the housing 20 and the bearing bracket 30, and the bearing is sleeved on the output shaft 311 of the rotor assembly.
[0057] Please see Figures 7 to 8 As shown, in this embodiment, a bearing mounting chamber 201 is formed within both the housing 20 and / or the bearing bracket 30. An annular groove 202 is formed on the side wall of this bearing chamber, and an elastic element 203 is embedded within the annular groove 202. A bearing is installed within the bearing chamber, and a rubber pad 204 is also arranged between the bearing and the bottom surface of the mounting chamber. The bearing is fixed by the compression action between itself and the elastic element 203. Furthermore, the elastic element 203 and the rubber pad 204 also provide a buffering effect, effectively reducing motor noise. In this embodiment, the elastic element 203 is a rubber ring or other elastic structure. It is understood that the installation and fixing methods of the bearing mounting chamber, the elastic element, and the second bearing in the bearing bracket are the same or similar. The following embodiment uses the bearing installation within the housing 20 as an example for explanation.
[0058] Please see Figure 7 , Figure 8 and Figure 9As shown, in this embodiment, a bearing mounting chamber 201 is formed inside the housing 20. An annular groove 202 is provided on the side wall of the bearing mounting chamber 201. An elastic element 203 is fixedly installed in the annular groove 202. A first bearing 301 is sleeved on the output shaft 311 of the rotor assembly and located inside the bearing mounting chamber 201. The outer side wall of the first bearing 301 is pressed and fixed with the elastic element 203. That is, the first bearing 301 is elastically pressed with the elastic element 203, so that the outer ring of the bearing is elastically and tightly fitted with the elastic element 203. The bearing is fixed by friction, so that the vibration generated by the motor during operation can be buffered by the elastic element 203, which can reduce the transmission of bearing vibration to the outside of the motor and effectively reduce motor noise. At the same time, since the bearing is not completely fixed when the motor is running, it can be adjusted to the optimal position in the bearing chamber, ensuring smooth motor operation.
[0059] Please see Figure 8 , Figure 9 and Figure 10 As shown, in this embodiment, at least two annular grooves 202 are provided on the side wall of the bearing mounting chamber 201. Each annular groove 202 is embedded with an elastic element 203 to increase the friction between the first bearing 301 and the elastic element 203 during installation, ensuring reliable installation. At the same time, the presence of multiple elastic elements 203 can further reduce bearing vibration transmission and effectively reduce motor noise.
[0060] Please see Figure 8 , Figure 9 and Figure 10As shown, in this embodiment, along the axial direction of the elastic member 203, the thickness of the elastic member 203 is greater than the width of the annular groove 202. This ensures that after the elastic member 203 is embedded in the annular groove 202, the elastic member 203 can be securely installed within the annular groove 202 due to the compression action of its elastic deformation on the sidewall of the annular groove 202, preventing the elastic member 203 from falling off. In this embodiment, along the radial direction of the elastic member 203, the thickness of one side of the elastic member 203 is greater than the depth of the annular groove 202. This ensures that after the elastic member 203 is embedded in the annular groove 202, it at least partially protrudes from the annular groove 202, making compression contact with the first bearing 301 in the bearing mounting chamber 201. This ensures that it can fix the first bearing 301 and provide vibration damping. In this embodiment, the inner diameter of the elastic element 203 is smaller than the outer diameter of the first bearing 301 to ensure that the bearing can exert a squeezing effect on the elastic element 203 after installation, thus ensuring the reliability of its installation and the effectiveness of vibration reduction. In this embodiment, the cross-sectional shape of the elastic element 203 can be any one or more of a circle, rectangle, and ellipse, and the cross-sectional shape of the annular groove 202 can be any one or more of a rectangle, trapezoid, and triangle. Of course, the cross-sectional shapes of the elastic element 203 and the annular groove 202 can also be set to other shapes.
[0061] Please see Figure 8 , Figure 9 and Figure 10 As shown, in this embodiment, the surface of the elastic member 203 may also be provided with one or more of the following: protrusions, ribs, or other surface protrusion structures, in order to increase the friction between the elastic member 203 and the first bearing 301, ensure the reliability of its installation, increase the buffering capacity of the elastic member 203, and further reduce motor noise.
[0062] Please see Figure 8 , Figure 9 and Figure 10 As shown, in this embodiment, a rubber pad 204 is also provided between the end face of the first bearing 301 and the bottom surface of the bearing mounting chamber 201. The rubber pad 204 can play a buffering role, further reducing the transmission of bearing vibration to the outside of the motor, so as to reduce motor noise.
[0063] The above embodiment involves creating grooves on the inner wall of the bearing housing and embedding elastic elements. The elastic elements are elastically contacted and fixed to the inner wall of the grooves. The rotor bearing is installed in the bearing housing, with the bottom of the bearing in contact with the rubber pad and the outer ring of the bearing elastically and tightly fitted to the elastic elements. The bearing is fixed by friction, so that the vibration generated by the motor during operation can be buffered by the elastic elements and rubber pads. This reduces the transmission of bearing vibration to the outside of the motor, effectively reducing motor noise. At the same time, since the bearing is not completely fixed during motor operation, it can be adjusted to the optimal position in the bearing housing, ensuring smooth motor operation.
[0064] Please refer to the following: Figures 11 to 18 As shown, it can also be understood that the impeller is an important component of the motor. The motor drives the impeller to rotate at high speed, generating airflow. Most existing motors use centrifugal impellers. These impellers, while offering the same performance, suffer from drawbacks such as larger size, inability to withstand high speeds, low machining precision, and susceptibility to vibration and noise. Therefore, this invention provides a motor impeller to solve the problems of existing motors using centrifugal impellers, which result in larger size, inability to withstand high speeds, low machining precision, and susceptibility to vibration and noise while offering the same performance. In the following embodiments, the first direction described is either clockwise or counterclockwise, and the second direction is the opposite of the first direction. In the following embodiments, the first direction is counterclockwise and the second direction is clockwise, as an example.
[0065] Please see Figures 11 to 16 As shown, the motor fan blade 10 includes a fan blade disk 11 and fan blades 12. The fan blade disk 11 is generally conical in shape, with a shaft hole 111 in the middle. The shaft hole 111 is used to connect with the motor shaft of the motor. A plurality of fan blades 12 are evenly distributed on the fan blade disk 11. The plurality of fan blades 12 are arranged around the shaft hole 111, and the fan blades 12 extend from the outer edge of the fan blade disk 11 toward the shaft hole 11 in a first direction and are arranged in a spiral.
[0066] Please see Figure 11 and Figure 12 As shown, in this embodiment, the thickness of the wind blade 12 gradually increases from both ends towards the middle. Specifically, the wind blade 12 includes a tail end 121 and a front end 122. The tail end 121 is the end of the wind blade 121 near the outer edge of the wind disk 11, and the front end 122 is the end of the wind disk 11 near the shaft hole 111. In the helical direction of the wind blade 12, the thickness of the wind blade 12 gradually increases from the front end 122 and the tail end 121 towards the middle, which increases the blade strength to a certain extent, enabling it to withstand higher rotational speeds.
[0067] Please see Figure 11 , Figure 12 and Figure 13 As shown, in this embodiment, the fan blade 12 has an arc-shaped structure. The two sides of the fan blade 12 along the first direction are the inner side 123 and the outer side 124 of the arc-shaped structure, respectively. Two adjacent fan blades 12 form an airflow channel. At the same position, the radius of curvature of the inner side 123 is greater than that of the outer side 124. For example, at the thickest part of the fan blade 12, the radius of curvature of the inner side 123 is greater than that of the outer side 124. Its cross-section is crescent-shaped. The curvature of the two sides of the fan blade 122 is not equal, that is, it adopts a non-parallel design, which allows the airflow to flow smoothly in the blade. Its flow rate is uniform, which can reduce noise and improve the efficiency of the fan blade. Under the same performance, the motor fan blade is smaller in size and has lower noise, thus achieving the purpose of high performance, miniaturization, lightweight and low noise of the motor.
[0068] Please see Figure 11 , Figure 12 and Figure 13 As shown, in this embodiment, the fan blade 12 and the fan disk 11 are arranged at an angle. Specifically, the tangent of the outer edge of the fan disk 11 at the tail end 121 of the fan blade 12 is arranged at an angle to the tail end 121 of the fan blade 12. For example, along the second direction, the tangent and the tail end 121 of the fan blade 12 are not perpendicular, that is, the tangent and the tail end 121 of the fan blade 12 form an angle α. The angle α is set between 98° and 105° to reduce the noise when the fan blade rotates.
[0069] Please see Figure 11 , Figure 12 , Figure 14 and Figure 15 As shown, in this embodiment, the air inlet of the fan blade 12 is inclined to the axis of the fan disk 11, that is, the front end 122 of the fan blade 12 is inclined to the axis of the fan disk 11. Specifically, the conical fan disk 11 includes a large end 112 and a small end 113. The front end 122 of the fan blade 12 includes a first side 1221 and a second side 1222. The first side 1221 is the side connected to the fan disk 11, and the second side 1222 is the side away from the fan disk 11. In the direction X from the small end 113 to the large end 112, the second side 1222 to the first side 1221 of the front end 122 are arranged obliquely to be inclined to the axis of the fan disk 11. The small included angle β formed between the front end 12 and the axis of the fan disk 11 is set between 75° and 85° to further reduce the noise when the fan blade rotates and improve the user comfort.
[0070] Please see Figure 11 , Figure 12 , Figure 14 and Figure 16 As shown, in this embodiment, along the axial direction of the fan blade disk 11, the tail end 121 of the fan blade 12 forms an included angle γ with the outer edge of the fan blade disk 11. Specifically, the tail end 121 of the fan blade 12 includes a third side 1211 and a fourth side 1212. The third side 1211 is the side connected to the fan blade disk 11, and the fourth side 1212 is the side away from the fan blade disk 11. In the radial direction of the fan blade disk 11, the third side 1211 to the fourth side 1212 extend from the outer edge of the fan blade disk 11 away from the outer edge, so that the tail end 121 forms an included angle γ with the outer edge of the fan blade disk 11. The included angle γ is set between 140° and 160°. In this embodiment, the maximum outer diameter of the fan blade 12 is greater than the outer diameter of the fan disk 11. That is, the tail end 121 of the fan blade 12 protrudes outward relative to the outer edge of the fan disk 11, and the maximum outer diameter D1 of the tail end 121 of the fan blade 12 is 1.05 to 1.15 times its minimum outer diameter D2. The maximum outer diameter is located on the side of the tail end 121 of the fan blade 12 away from the fan disk 11, i.e., the fourth side 1212. The minimum outer diameter is located on the side of the tail end 121 of the fan blade 12 connected to the fan disk 11, i.e., the third side 1211, in order to further reduce the noise when the fan blade rotates.
[0071] Please see Figures 11 to 18 As shown, a fan shroud 21 is provided at one end of the housing 20. A stator assembly and a rotor assembly are provided inside the housing 20. A rotating shaft is provided in the middle of the rotor assembly. A motor fan 10 is provided inside the fan shroud 21. The shaft hole of the motor fan blade 10 is fixedly connected to the rotating shaft. The large end of the fan blade disk 11 in the motor fan blade 10 is close to the rotor assembly. The structure of the motor fan blade 10 is the same as or similar to that of the motor fan blade 10 described in the above embodiment. To avoid repetition, it will not be described again here.
[0072] This utility model proposes a motor fan blade designed as a turbine fan blade structure. The fan blade has a structure that is thick in the middle and thin at both ends, which increases the strength of the blade and enables it to withstand higher speeds. By rationally designing the angle between the tail end of the fan blade and the fan blade disk, the angle at the air inlet of the fan blade, and the size of the fan blade, the cavity flow field is made smoother, improving efficiency. Under the same performance, it is smaller in size and lower in noise, achieving the goals of high performance, miniaturization, lightweight and low noise of the motor.
[0073] Please see Figures 1 to 19As shown, this utility model also proposes an electric tool, which includes a motor 100 as described in the above embodiments. The electric tool is one of a vacuum cleaner, a hair dryer, a pruning machine, and a chainsaw. For example, taking a vacuum cleaner 200 as an example: the vacuum cleaner 200 includes a housing 210, a dust collection unit 220 mounted on the housing 210, a suction generating unit 230, an air duct unit 240, and a floor brush 250. The housing 210 includes a body, a handle, and a base. The handle is located between the body and the base. The air duct unit 240 is used to cooperate with the air inlet and the floor brush 250. The suction generating unit 230 is connected to the side of the body away from the handle. The suction generating unit 230 includes a housing and a motor 100 disposed in the housing. The motor 100 includes a stator 40, a bearing mounting structure, and a motor fan blade 10 as described in the above embodiments. To avoid repetition, these will not be described again here.
[0074] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.
Claims
1. A stator, characterized in that, include: The stator core includes multiple continuous and equally divided yoke regions, each yoke region having a tooth region. Two adjacent yoke regions are connected into a whole by a connecting region, which is located on the outer circumference of the yoke region and has an arc structure. A coil winding is wound on the toothed region, and multiple continuous and evenly divided yoke regions are bent along the connecting region to form a circular structure.
2. The stator according to claim 1, characterized in that, The arc contour lines of the connecting area near the inner side of the circular structure and near the outer side of the circular structure are concentric arcs.
3. The stator according to claim 2, characterized in that, The arc contour line of the connecting area near the inner side of the circular structure is the superior arc, and the arc contour line near the outer side of the circular structure is the inferior arc.
4. The stator according to claim 2, characterized in that, The radius of the arc contour line of the connecting area near the inner side of the circular structure is smaller than the radius of the arc contour line near the outer side of the circular structure.
5. The stator according to claim 1, characterized in that, The two yoke regions located on either side of a plurality of continuous and equally divided yoke regions are a first yoke region and a second yoke region, respectively. The first contour line of the first yoke region on the side away from the connecting region and the second contour line of the second yoke region on the side away from the connecting region are adapted to each other.
6. The stator according to claim 5, characterized in that, The first yoke region has a groove on the side away from the connecting region, and the second yoke region has a protrusion on the side away from the connecting region, the protrusion being adapted to the groove.
7. The stator according to claim 1, characterized in that, It also includes an insulating frame that surrounds the stator, and the coil windings are wound around the insulating frame.
8. The stator according to claim 7, characterized in that, It also includes terminals for connecting the coil windings, and the insulating frame, the terminals and the stator are integrally injection molded.
9. An electric motor, characterized in that, Includes a rotor and a stator, the stator comprising: The stator core includes multiple continuous and equally divided yoke regions, each yoke region having a tooth region. Two adjacent yoke regions are connected into a whole by a connecting region, which is located on the outer circumference of the yoke region and has an arc structure. A coil winding is wound on the toothed region, and multiple continuous and evenly divided yoke regions are bent along the connecting region to form a circular structure.
10. A power tool, characterized in that, The motor includes a rotor and a stator, the stator comprising: The stator core includes multiple continuous and equally divided yoke regions, each yoke region having a tooth region. Two adjacent yoke regions are connected into a whole by a connecting region, which is located on the outer circumference of the yoke region and has an arc structure. A coil winding is wound on the toothed region, and multiple continuous and evenly divided yoke regions are bent along the connecting region to form a circular structure.
11. The power tool according to claim 10, characterized in that, The power tool is one of the following: a vacuum cleaner, a hair dryer, a pruning machine, and a chainsaw.