Motor and hair care appliance

Abstract

The present application relates to a kind of motor and hair care appliance.Electric machine includes: rotor assembly;Stator assembly, the stator assembly is set to the outside of the rotor assembly, the stator assembly includes stator yoke and stator tooth, the stator yoke includes multiple connecting parts, each connecting part is connected with a stator tooth, at least one side of the area where the connecting part is located on the stator yoke is provided with a notch in the circumferential direction;Housing, the housing is located outside the rotor assembly and the stator assembly, the material of the housing is magnesium-aluminum alloy.The electric machine is smaller in size and weight, so that the size and weight of the hair care appliance using the electric machine are also smaller, not easy to feel tired when used for a long time, more convenient to store and carry out.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to an electric machine and a hair care appliance. BACKGROUND

[0002] In daily life, after washing hair, if the water on the hair evaporates naturally, a long time needs to be waited, and a hair dryer can accelerate the drying of the hair, shorten the waiting time, and bring great convenience to our life. Usually, an electric machine and a blade are arranged in the hair dryer, the blade is driven to rotate by the electric machine, so as to accelerate the flow of air, and the hair is more easily dried. However, in some current hair dryers, the volume of the electric machine is large, which leads to large volume and weight of the whole hair dryer, and it is tiring to use for a long time, and it is not convenient to store and carry out. SUMMARY

[0003] Therefore, the present application provides an electric machine with smaller volume and weight, so that the hair care appliance using the electric machine also has smaller volume and weight, and it is not easy to feel tired when used for a long time, and it is more convenient to store and carry out.

[0004] The electric machine comprises:

[0005] a rotor assembly;

[0006] a stator assembly, the stator assembly is arranged outside the rotor assembly, the stator assembly comprises a stator yoke and a stator tooth, the stator yoke comprises a plurality of connecting portions, each connecting portion is connected with a stator tooth, and at least one side of the area where the connecting portions are located on the stator yoke is provided with a notch in the circumferential direction;

[0007] a machine shell, the machine shell is located outside the rotor assembly and the stator assembly, and the material of the machine shell is magnesium-aluminum alloy.

[0008] In one embodiment, both sides of the area where the connecting portions are located on the stator yoke are provided with the notch in the circumferential direction.

[0009] In one embodiment, the stator yoke comprises a plurality of first units, the connecting portions are located at the first units, both sides of the first unit are connected with a second unit in the circumferential direction, the notch is arranged at the outer side wall of the second unit, the outer side wall of the first unit is a first arc surface with the center of the stator yoke as a first center, the outer side wall of the second unit comprises a second unit outer side wall first segment and a second unit outer side wall second segment, the second unit outer side wall first segment is connected with the first unit, the second unit outer side wall second segment is a second arc surface, the center of the second arc surface is a second center, and a plurality of second centers form an equivalent circle with the first center as the center.

[0010] The central angle a1 of the outer side wall of the first unit ranges from 26° to 29°, the central angle a2 of the second segment of the outer side wall of the second unit ranges from 55° to 60°, the diameter D1 of the first arc surface ranges from 16 mm to 18 mm, the diameter D2 of the second arc surface ranges from 4 mm to 6 mm, the diameter D3 of the equivalent circle ranges from 11 mm to 13 mm, and the average wall thickness L of the stator yoke ranges from 1.18 mm to 2.2 mm.

[0011] In one of the embodiments, the inner side wall of the second unit is provided with the notch, and the inner side wall of the second unit comprises a first segment, a second segment, a third segment and a fourth segment connected in sequence, the first segment is connected with the first unit, the second segment is a third arc surface, the fourth segment is a fourth arc surface, and the centers of the third arc surface and the fourth arc surface are located on the equivalent circle.

[0012] The diameter D4 of the third arc surface and the fourth arc surface ranges from 2 mm to 4 mm, and the central angle a4 of the third arc surface and the fourth arc surface ranges from 38° to 40°.

[0013] In one of the embodiments, the second units are connected by a third unit, the inner side wall of the third unit is provided with a protruding portion protruding radially inward, and the protruding portion is provided with a through hole.

[0014] In one of the embodiments, the motor further comprises a fastener, the fastener being capable of penetrating through the through hole to connect the stator assembly and the casing.

[0015] Alternatively, the motor further comprises a limiting piece, the limiting piece being connected with the casing, and the limiting piece being capable of extending into the through hole.

[0016] Alternatively, the motor further comprises a limiting piece and a fastener, the fastener being capable of penetrating through part of the through hole to connect the stator assembly and the casing, and the limiting piece being connected with the casing and capable of extending into part of the through hole.

[0017] In one of the embodiments, the motor further comprises a casing, the casing comprising an inner casing, an outer casing and a plurality of guide vanes, the outer casing being sleeved outside the inner casing, the inner casing and the outer casing being connected through the guide vanes, the air duct being formed between adjacent guide vanes, and the number n of the guide vanes ranging from 5 to 12.

[0018] In one of the embodiments, the stator assembly extends radially into the air duct.

[0019] In one of the embodiments, the inner shell and the outer shell are both hollow cylinders; or, the inner shell and the outer shell are both hollow cubes; or, the inner shell and the outer shell are both conical barrels, and the radial dimensions of the inner shell and the outer shell gradually decrease along the direction of air flow.

[0020] In one of the embodiments, a sound resistance member is arranged between the rotor assembly and the casing, and the sound resistance member is made of copper, steel or zinc.

[0021] In one of the embodiments, the sound resistance member and the casing are integrally formed by die casting.

[0022] In one of the embodiments, the rotor assembly comprises a rotor shaft and a bearing, the bearing is sleeved on the rotor shaft, the rotor shaft and the sound resistance member are connected through the bearing, and a damping member is arranged between the bearing and the sound resistance member.

[0023] The stator assembly further comprises a skeleton, and the skeleton and the stator teeth are integrally formed by injection molding.

[0024] The motor described above is provided with a plurality of connecting portions on the stator yoke for connecting with the stator teeth, and a notch is arranged in the area on at least one side of the connecting portion on the stator yoke, so as to reduce the size and volume of the stator assembly and the weight of the motor. Secondly, the notch area is located at the position on at least one side of the connecting portion, and the space of this area is enlarged by arranging the notch, so that the coil winding is more easily installed. Thirdly, this area avoids the connection between the stator yoke and the stator teeth, and does not affect the performance of the motor. In addition, the material of the casing is selected as magnesium-aluminum alloy, which has a smaller density and can reduce the weight of the casing, thereby reducing the weight of the motor. That is, under the condition that the performance is not affected, the volume and weight of the motor can be reduced to a certain extent, so that the volume and weight of the hair care appliance applying the motor are also smaller, and the winding and other components are easily installed, and it is not easy to feel tired during long-term use, and it is more convenient to store and carry out.

[0025] The present application also provides a hair care appliance, which applies a motor with smaller volume and weight, so that the volume and weight of the hair care appliance are also smaller, and it is not easy to feel tired during long-term use, and it is more convenient to store and carry out.

[0026] The hair care appliance comprises the motor described above.

[0027] In one of the embodiments, the hair care appliance further comprises a plurality of blades distributed in a circumferential direction and connected to the rotor assembly, the width of the blades gradually increases along a radial direction from the center to the periphery of the rotor assembly, and the angle between the blades and the axis of the rotor assembly gradually increases.

[0028] The hair care appliance has the stator yoke of the motor provided with a plurality of connecting portions for connecting with the stator teeth, and a notch is arranged at the area of at least one side of the connecting portion of the stator yoke, so that the size and volume of the stator assembly and the weight of the motor can be reduced; secondly, the notch area is located at the position of at least one side of the connecting portion, and the space of the area is enlarged by arranging the notch, so that the coil winding is more easily installed; thirdly, the area avoids the connecting position of the stator yoke and the stator teeth, and does not affect the performance of the motor. In addition, the material of the shell is selected as magnesium-aluminum alloy, which has smaller density, so that the weight of the shell can be reduced, thereby reducing the weight of the motor. That is, the motor can reduce the volume and weight to a certain extent under the condition that the performance is not affected, so that the volume and weight of the hair care appliance are also smaller, and the winding and other components are easily installed, and the user does not feel tired after long time use, and the hair care appliance is more convenient to store and carry out. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The structure diagram of the motor and the fan blade in one embodiment of the present application;

[0030] Figure 2 The structure diagram of the motor and the fan blade in one embodiment of the present application; Figure 1 The sectional view of the motor and the fan blade in one embodiment of the present application;

[0031] Figure 3 The structure diagram of the motor and the fan blade in one embodiment of the present application; Figure 1 The structure diagram of the motor and the fan blade in one embodiment of the present application;

[0032] Figure 4 The structure diagram of the motor and the fan blade in one embodiment of the present application; Figure 1 The structure diagram of the motor and the fan blade in one embodiment of the present application;

[0033] Figure 5 The structure diagram of the motor and the fan blade in one embodiment of the present application; Figure 1 The structure diagram of the motor and the fan blade in one embodiment of the present application;

[0034] Figure 6 The structure diagram of the motor and the fan blade in one embodiment of the present application; Figure 1 The structure diagram of the motor and the fan blade in one embodiment of the present application;

[0035] Figure 7 The top view of the stator yoke of the motor in the prior art;

[0036] Figure 8 The top view of the stator yoke of the motor in the prior art; Figure 1 The top view of the stator yoke of the motor in the prior art;

[0037] Figure 9 The top view of the stator yoke of the motor in the prior art;Figure 1 A top view of a stator yoke portion of the electric machine;

[0038] Figure 10 For Figure 1 A magnetic circuit simulation diagram of a stator assembly of the electric machine;

[0039] Figure 11 For Figure 1 A torque parameter of the electric machine;

[0040] Figure 12 For Figure 1 A back EMF parameter of the electric machine;

[0041] Figure 13 For Figure 1 A air gap flux density parameter of the electric machine;

[0042] Figure 14 For Figure 1 A stator core yoke portion flux density parameter of the electric machine;

[0043] Figure 15 For Figure 1 A stator core tooth portion flux density parameter of the electric machine;

[0044] Figure 16 For Figure 1 A cross-sectional view of a rotor assembly and a fan blade of the electric machine;

[0045] Figure 17 For Figure 1 A top view of a partial structure of the fan blade;

[0046] Figure 18 For Figure 17 A cross-sectional view at g;

[0047] Figure 19 For Figure 17 A cross-sectional view at h;

[0048] Figure 20 For Figure 17 A cross-sectional view at i;

[0049] Figure 21 For Figure 1 A structural schematic diagram of a machine housing of the electric machine.

[0050] Reference signs:

[0051] Stator assembly 100, stator yoke 110, first unit 111, clamping slot 1111, first unit outer side wall 1112, second unit 112, second unit outer side wall first section 1121, second unit outer side wall second section 1122, second unit inner side wall first section 1123, second unit inner side wall second section 1124, second unit inner side wall third section 1125, second unit inner side wall fourth section 1126, equivalent circle 1127, third unit 113, third unit outer side wall 1131, protruding part 1132, third unit inner side wall 1133, through hole 1134, through hole outer side wall 11341, through hole inner side wall first section 11342, through hole inner side wall third section 11343, through hole inner side wall fourth section 11344, stator tooth 120, clamping block 121, skeleton 130, mounting slot 131, winding 140, pin 150, insulating sheet 160, cover plate 170, avoiding hole 171, PCB 180, notch 190;

[0052] Rotor assembly 200, rotor shaft 210, recess 211, rotor magnetic ring 220, first bearing 231, second bearing 232, bearing positioning member 240;

[0053] Fan blade 300, fan blade connecting part 310, blade 320;

[0054] Casing 400, inner casing 410, hole site 411, outer casing 420, air duct 430, air guide sheet 440;

[0055] Limiting member 500;

[0056] Acoustic resistance member 600. DETAILED DESCRIPTION

[0057] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described and it is therefore contemplated to cover all such modifications as fall within the scope of the application. It should be noted that the specific embodiments of the present application do not limit the scope of the present application.

[0058] In the description of the application, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the application.

[0059] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0060] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0061] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0062] It is to be noted that when an element is referred to as being "on" or "connected to" another element, it can be directly on the other element or intervening elements can also be present. In addition, the term "connected" as used herein means the element that can be directly or indirectly connected to the other element. As used herein, the terms "vertical", "horizontal", "upper", "lower", "left", "right", and the like are merely used for the purpose of explanation and are not intended to be limiting.

[0063] Referring to Figure 1 with Figure 2 An embodiment of the present application provides a motor including a stator assembly 100, a rotor assembly 200, and a housing 400. The stator assembly 100 is disposed outside the rotor assembly 200, and the housing 400 is disposed outside the stator assembly 100 and the rotor assembly 200. The housing 400 supports and protects the components inside the housing 400, so as to prevent foreign matter from entering and to prevent the motor from being affected by the outside environment.

[0064] Referring to Figures 5 to 9 The stator assembly 100 includes a stator core, the stator core includes a stator yoke 110 and a stator tooth 120, the stator tooth 120 is located inside the stator yoke 110, the stator yoke 110 includes a plurality of connecting portions, each stator tooth 120 is connected to one connecting portion, and a winding 140 is disposed on the stator tooth 120. A plurality of notches are disposed on the stator yoke 110, and the notches are used to reduce the volume and weight of the stator yoke 110. Specifically, at least one side region of the region where the connecting portions are located on the stator yoke 110 is provided with the notches. The region provided with the notches is away from the connection between the stator yoke 110 and the stator tooth 120, so that the material of the region provided with the notches is removed without affecting the connection between the stator yoke 110 and the stator tooth 120, and the performance of the motor is not affected. In addition, the space of the region provided with the notches is increased, and the components such as the stator tooth 120 and the winding 140 can be installed to avoid interference and be easily installed, and the components can be distributed more compactly, which is beneficial to reducing the overall size of the motor.

[0065] Further, at least one side region of the region where the connecting portions are located on the stator yoke 110 is provided with the notches. In this way, the volume and weight of the stator yoke 110 can be further reduced, and when the components such as the stator tooth 120 and the winding 140 are installed, both sides can be avoided to be interfered and be easily installed.

[0066] Preferably, the stator yoke 110 is snap-connected with the stator tooth 120, which is easy to install and convenient to disassemble and maintain. Further, the stator tooth 120 is provided with a clamping block 121, and the stator yoke 110 is provided with a plurality of clamping grooves 1111, which are the connecting portions described above. Each clamping groove 1111 is clamped with a clamping block 121, thereby realizing the connection between the stator yoke 110 and the stator tooth 120. Of course, the positions of the clamping grooves and the clamping blocks can also be exchanged. The stator yoke 110 and the stator tooth 120 can also be bonded, so that the fixation is more stable.

[0067] Preferably, the clamping grooves 1111 described above can be dovetail grooves, and the shape and size of the clamping blocks 121 match the dovetail grooves. The width of the groove bottom of the dovetail groove is greater than the width of the groove opening, so that the clamping blocks 121 are not easy to fall off after being clamped, and the fixation is more stable.

[0068] Preferably, referring to Figure 8 and Figure 9 , the stator yoke 110 includes a plurality of first units 111, and the clamping grooves 1111 described above are arranged at the inner side walls of the first units 111. The outer side wall of the first unit 1112 is a first arc surface, and the first center O of the first arc surface coincides with the center of the stator core. Along the circumferential direction, the two sides of the first unit 111 are connected with a second unit 112 respectively, and the outer side wall of the second unit 112 includes a first segment 1121 and a second segment 1122 of the outer side wall of the second unit, wherein the first segment 1121 of the outer side wall of the second unit is connected with the first unit outer side wall 1112. The second segment 1122 of the outer side wall of the second unit is a second arc surface, and the center of the second arc surface is a second center O1. A plurality of second centers O1 of the second arc surfaces form an equivalent circle 1127 with the first center O as the center. The first segment 1121 of the outer side wall of the second unit can be a plane, or it can also be a curved surface.

[0069] Specifically, the corresponding central angle a1 of the first arc surface (the first unit outer side wall 1112) ranges from 26° to 29°, and the diameter D1 ranges from 16 mm to 18 mm. The diameter D3 of the equivalent circle 1127 ranges from 11 mm to 13 mm, the diameter D2 of the second arc surface (the second segment 1122 of the outer side wall of the second unit) ranges from 4 mm to 6 mm, and the corresponding central angle a2 ranges from 55° to 60°.

[0070] Satisfying the above conditions, a notch 190 will be formed at the outer side wall of the second unit 112 on both sides of the first unit 111. In addition, a notch is also formed at the inner side wall of the second unit 112. The average wall thickness L of the stator yoke 110 ranges from 1.18 mm to 2.2 mm. Within this wall thickness range, the magnetic flux density on the stator yoke 110 will not be saturated due to the removal of material.

[0071] Furthermore, the notch at the inner wall of the second unit 112 satisfies the following conditions. The inner wall of the second unit 112 includes a first segment 1123, a second segment 1124, a third segment 1125, and a fourth segment 1126 of the inner wall of the second unit, connected sequentially. The first segment 1123 is connected to the inner wall of the first unit 111. The second segment 1124 is a third arc surface, and the fourth segment 1126 is a fourth arc surface. The centers of the third and fourth arc surfaces coincide with the aforementioned second center O1. The first segment 1123 and the third segment 1125 of the inner wall of the second unit can be planes or curved surfaces.

[0072] Specifically, the diameter D4 of the third arc surface (second segment 1124 of the inner wall of the second unit) and the fourth arc surface (fourth segment 1126 of the inner wall of the second unit) ranges from 2mm to 4mm, and the corresponding central angle a4 ranges from 38° to 40°. Meeting these conditions, a notch 190 will also be formed on the inner wall of the second unit 112 on both sides of the first unit 111.

[0073] See Figures 6 to 9 ,and Figure 7 Compared to the conventional yoke shown, Figure 6 In this process, after a notch is formed on the inner wall of the second unit 112 on both sides of the first unit 111, the space for accommodating the winding 140 will be increased, making it easier to install the winding 140.

[0074] Furthermore, the two second units 112 located between the two first units 111 are connected by a third unit 113. The outer wall 1131 of the third unit is an arc surface coplanar with the aforementioned first arc surface. The range of the central angle a3 corresponding to the outer wall 1131 of the third unit is 35°≤a3≤40°.

[0075] Furthermore, the inner wall 1133 of the third unit protrudes radially inward to form a protrusion 1132. The total volume of all protrusions 1132 on the stator yoke 110 is smaller than the total volume of all notches, so that the total volume and mass of the stator yoke 110 do not increase due to the protrusions 1132. A through hole 1134 is provided at the protrusion 1132, which can be used to fix and install the stator assembly 100 or to limit its movement. Therefore, while still reducing the total volume and mass, the installation or limiting of the stator assembly 100 can be made more convenient.

[0076] For details, please refer to Figures 5 to 7 and Figure 21The casing 400 is also provided with a hole site 411 corresponding to the through hole 1134, and the hole site 411 is connected with a limiting part 500. When the stator assembly 100 is installed in the casing 400, the limiting part 500 is inserted into the through hole 1134 to limit the stator assembly 100 and ensure the accuracy of the position. The stator assembly 100 and the casing 400 can be fixed by interference fit and / or adhesion. Preferably, the through hole 1134 is a special-shaped hole to enhance the limiting effect between the limiting part 500 and the through hole 1134.

[0077] Alternatively, the hole site 411 is circular, and the threaded fastener is sequentially inserted through the through hole 1134 and the hole site 411 to achieve the fixed connection between the stator assembly 100 and the casing 400.

[0078] Alternatively, part of the through hole 1134 is circular, and the threaded fastener is arranged at the through hole 1134 and the hole site 411 to achieve the fixation between the stator assembly 100 and the casing 400. Part of the through hole 1134 is a special-shaped hole, and the limiting part 500 is arranged at the through hole 1134 and the hole site 411 to enhance the limiting between the stator assembly 100 and the casing 400.

[0079] Figure 7 In the conventional stator yoke structure shown, if the fixation between the stator assembly 100 and the casing 400 is to be achieved, an additional fixing structure is usually needed on the outside of the stator assembly 100, which makes the structure more complex and the outer diameter larger. In addition, it also causes the air duct space in the casing 400 to be smaller, which is not conducive to heat dissipation. However, after the through hole 1134 is arranged on the stator yoke 110 in the above manner, the outer diameter is not increased, the arrangement between the components can be more compact, which is conducive to reducing the size and will not affect the heat dissipation.

[0080] Continuing to refer to Figure 8 and Figure 9 In some embodiments, the through hole 1134 is a special-shaped hole, the outer side wall 11341 of the through hole is an arc surface with the first center O as the center, and the diameter D5 is in the range of 14mm≤D5≤16mm. The first section 11342 and the third section 11343 of the inner side wall of the through hole are both planes, and the included angle a5 between them is in the range of 50°≤a5≤70°. The third unit inner side wall 1133 and the fourth section 11344 of the inner side wall of the through hole are both arc surfaces with the same center, the diameter D6 of the fourth section 11344 of the inner side wall of the through hole is in the range of 2mm≤D6≤3mm, and the diameter D7 of the third unit inner side wall 1133 is in the range of 3mm≤D7≤4mm.

[0081] Referring to Figure 10 When the stator yoke 110 and the stator tooth 120 are Figure 6As shown in the diagram, the magnetic circuit simulation shows that although there is a gap, the magnetic circuit is complete. When the average wall thickness around the through hole 1134 is similar, the simulation results for the through hole 1134 being an irregularly shaped hole or a circular hole are similar, so the simulation results for the irregularly shaped hole are omitted here.

[0082] See Figure 11 The theoretical torque range of the motor is between 0.004 and 0.005. Figure 11 The torque waveform is stable and the value remains between 0.004 and 0.005, which meets the requirements for torque parameters in motor design. This indicates that although there is a gap, it does not affect the torque of the motor.

[0083] See Figure 12 The back EMF waveform of the motor tends to be sinusoidal, so the harmonics are smaller, the efficiency is higher, the harmonic vibration is smaller, and the motor vibration noise is lower.

[0084] See Figure 13 The air gap magnetic flux density shows a trend of first increasing and then decreasing, which is consistent with the requirements of motor design and can provide sufficient magnetic flux.

[0085] See Figure 14 and Figure 15 When designing the motor, the magnetic flux density of the stator yoke is required to be within 1.5T, and the magnetic flux density of the stator teeth is required to be within 1.6T. As shown in the figure, the magnetic flux density of the stator yoke 110 is within 1.4T, and the magnetic flux density of the stator teeth 120 is within 1.6T. Therefore, magnetic saturation will not occur, and the motor efficiency will not decrease as a result.

[0086] Furthermore, through simulation calculations, Figure 7 The volume of the stator yoke shown is 1350 mm³. Figure 8 The volume of the stator yoke 110 shown ranges from 900 to 1050 mm³. Figure 7 The diameter of the outer wall of the conventional yoke shown is the same as Figure 8 The outer wall diameters of the first unit 111 of the stator yoke 110 shown are equal; Figure 7 The inner wall diameter of the conventional standard yoke shown is... Figure 8 The inner wall diameters of the first unit 111 of the stator yoke 110 shown are equal, and the dimensions of the dovetail grooves provided are equal.

[0087] Based on the above parameters, it can be seen that when the stator yoke 110 is configured according to the aforementioned structure, its various performance characteristics will not be affected. It is possible to use less material and produce a smaller motor in terms of size and weight while ensuring motor performance.

[0088] See Figure 5 and Figure 6Other components of the stator assembly 100 are described. In order to facilitate winding of the coils, a skeleton 130 is provided outside the stator tooth portion 120, the skeleton 130 is provided with mounting grooves 131, the stator tooth portion 120 is mounted in the mounting grooves 131, and the winding 140 is provided on the skeleton 130. The pins 150 are connected with the winding 140 and connected with the PCB board 180. The insulating sheet 160 is inserted between the skeleton 130 and the stator yoke portion 110, and one side surface is attached to the stator yoke portion 110. The cover plate 170 is fixed to the end of the stator yoke portion 110, and the cover plate 170 is provided with a relief hole 171 corresponding to the position of the through hole 1134, for avoiding the limiting member 500 or the threaded fastener.

[0089] Preferably, the skeleton 130 and the stator tooth portion 120 are integrally formed by injection molding. Compared with the conventional interference fit, after the two are integrally formed, there will be no impact between the two when the motor vibrates, which can reduce noise.

[0090] Referring to Figure 2 and Figure 21 Preferably, the material of the casing 400 is magnesium-aluminum alloy. The density of magnesium-aluminum alloy is relatively small, which can make the weight of the casing 400 lighter, thereby making the overall weight of the motor also lighter.

[0091] Further, the casing 400 includes an inner casing 410, a guide vane 440, and an outer casing 420. The outer casing 420 is located outside the inner casing 410, and the guide vane 440 is located between the inner casing 410 and the outer casing 420 and separates the inner casing 410 and the outer casing 420 to form a plurality of air ducts 430 for airflow to pass through. The air ducts 430 extend along the axial direction of the rotor assembly 200. The guide vane 440 can guide the airflow to flow in a predetermined direction and is not prone to turbulence.

[0092] Preferably, the inner casing 410 and the outer casing 420 are both hollow cylindrical, which has a relatively low manufacturing difficulty. Alternatively, they can also be hollow cuboids. Alternatively, they can also be conical barrels, and the radial dimensions of the inner casing 410 and the outer casing 420 gradually decrease along the direction of airflow. In this way, the air outlet velocity can be increased.

[0093] The guide vane 440 is perpendicular to the outer side wall of the inner casing 410 and the inner side wall of the outer casing 420, or the guide vane 440 can also be spiral.

[0094] If the number of guide vanes 440 is too large, the weight of the casing 400 can be too large, and if the number is too small, the connection strength between the inner casing 410 and the outer casing 420 can be weak, and the air guiding effect can be poor. Therefore, preferably, the number n of guide vanes 440 is in the range of 5≤n≤12. Further, n is 7, 8, or 9. When the above range is taken, the weight, connection strength, and air guiding effect can be considered.

[0095] Preferably, the stator assembly 100 extends radially between the inner shell 410 and the outer shell 420, and is located within the air duct 430. In this way, heat dissipation of the stator assembly 100 can be enhanced when airflow passes through the air duct 430.

[0096] Preferably, a sound-absorbing element 600 is provided between the rotor assembly 200 and the inner shell 410 to reduce noise. Specifically, the sound-absorbing element 600 is made of materials such as copper, steel, or zinc. These materials all have relatively high sound resistance, which can increase the resistance to noise transmission and thus reduce noise.

[0097] In some embodiments, the housing 400 is made of magnesium-aluminum alloy, and an acoustic damping element 600 is provided between the rotor assembly 200 and the inner housing 410. The acoustic damping element 600 increases the weight, while using a lighter magnesium-aluminum alloy for the housing 400 can reduce the weight. The two cancel each other out, and noise can be reduced while keeping the weight basically the same or even reducing it.

[0098] Preferably, the acoustic damper 600 and the inner shell 410 are integrally formed by die casting. This prevents impact between the acoustic damper 600 and the shell 400 when the motor vibrates, thus reducing noise. The outer wall of the acoustic damper 600 matches the shape and size of the inner wall of the inner shell 410, and the two fit together snugly. For example, both the inner shell 410 and the acoustic damper 600 are hollow cylinders, or both are hollow cubes.

[0099] See Figure 2 , Figure 4 and Figure 16 The rotor assembly 200 includes a rotor shaft 210 and a rotor magnetic ring 220, with the rotor magnetic ring 220 extending into the stator assembly 100. The rotor magnetic ring 220 is sleeved on the rotor shaft 210, and the two are fixedly connected. A first bearing 231 and a second bearing 232 are also provided on the rotor shaft 210, and the first bearing 231 and the second bearing 232 are connected to the aforementioned acoustic damper 600.

[0100] The acoustic damper 600 is sleeved on the outside of the first bearing 231 and the second bearing 232. Preferably, a shock absorber is provided between the acoustic damper 600 and the bearing to reduce the vibration and noise between the acoustic damper 600 and the housing 400. The shock absorber can be made of materials such as rubber, silicone, or foam.

[0101] Preferably, the rotor shaft 210 is provided with a groove 211 to limit the end of the first bearing 231 so that it is not easy to shift.

[0102] The rotor shaft 210 and the rotor magnetic ring 220 are fixed together by bonding and / or interference fit. Preferably, the outer circumferential surface of the rotor shaft 210 is provided with a plurality of annular grooves to accommodate adhesive during bonding.

[0103] Preferably, a bearing positioning member 240 is arranged between the first bearing 231 and the second bearing 232, for axially limiting the first bearing 231 and the second bearing 232, so that they are not easily displaced.

[0104] In some embodiments, the hair care appliance comprises the motor of any of the above embodiments, and has the advantages of the motor of any of the above embodiments. The hair care appliance can be a hair dryer, which can be used to dry hair or pet hair.

[0105] The hair care appliance is provided with a fan blade 300, which is fixedly connected with the rotor shaft 210, and the rotor shaft 210 drives the fan blade 300 to rotate to realize air supply. The fan blade 300 comprises a fan blade connecting portion 310 and a plurality of blades 320, which are fixedly connected with the fan blade connecting portion 310 and are distributed on the outer circumferential surface of the fan blade connecting portion 310 in the circumferential direction.

[0106] Referring to Figures 17 to 20 Preferably, along the radial direction from the center of the rotor shaft 210 to the outer circumferential surface, the width of the blade 320 gradually increases, and the included angle between the blade 320 and the axis of the rotor shaft 210 gradually increases, i.e. the inclination angle of the blade 320 relative to the axis of the rotor shaft 210 gradually increases. In this way, the closer to the rotor shaft 210, the closer the blade 320 is to the parallel state with the rotor shaft 210. The space near the rotor shaft 210 is small, so that the blade 320 is closer to the parallel state with the rotor shaft 210, which can accommodate more blades 320 and increase the density of the blades 320, so that the air blowing force is stronger. The width of the blade 320 near the rotor shaft 210 is smaller, which can further increase the number of blades 320 that can be accommodated. The space in the area away from the rotor shaft 210 is sufficient, so that the width of the blade 320 and the included angle between the blade 320 and the axis of the rotor shaft 210 can be appropriately increased.

[0107] In some embodiments, three positions are taken on the blade 320 along the radial direction from the center of the rotor shaft 210 to the outer periphery, which are respectively a first position, a second position and a third position. The distance g between the first position and the rotor shaft 210 is 8 mm, the width b of the blade 320 at the first position ranges from 7 mm to 8 mm, the angle a between the end surface of the rotor shaft 210 and the blade 320 at the first position ranges from 30° to 40°, that is, the angle a' between the axis of the rotor shaft 210 and the blade 320 at the first position ranges from 50° to 60°. The distance h between the second position and the rotor shaft 210 is 10 mm, the width d of the blade 320 at the second position ranges from 8 mm to 9 mm, the angle c between the end surface of the rotor shaft 210 and the blade 320 at the second position ranges from 20° to 35°, that is, the angle c' between the axis of the rotor shaft 210 and the blade 320 at the second position ranges from 55° to 70°. The distance i between the third position and the rotor shaft 210 is 12 mm, the width f of the blade 320 at the third position ranges from 9 mm to 10 mm, the angle e between the end surface of the rotor shaft 210 and the blade 320 at the third position ranges from 20° to 30°, that is, the angle e' between the axis of the rotor shaft 210 and the blade 320 at the third position ranges from 60° to 70°. In the present embodiment, it can be seen from the above dimensions that the width of the blade 320 near the rotor shaft 210 is smaller, and the blade 320 tends to be parallel to the rotor shaft 210, which can increase the number of blades 320 that can be accommodated, increase the density of the blades 320, increase the blowing power, and facilitate the installation of the blades 320.

[0108] Preferably, the number of blades 320 is 10, 11 or 12. At this time, the blowing power is sufficient, the arrangement is not too dense, and the installation of the blades 320 is more convenient.

[0109] The technical features of the above embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not contradict, they should be considered within the scope of the present disclosure.

[0110] The above embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims

1. An electric machine characterized in that, The motor comprises: a rotor assembly; a stator assembly, which is sleeved outside the rotor assembly, and comprises a stator yoke, a stator tooth and a framework, the stator yoke comprises a plurality of connecting portions, each of which is connected with a stator tooth; the stator yoke comprises a plurality of first units, the connecting portions are located at the first units, and each of the two sides of the first unit is connected with a second unit, and a notch is arranged at the inner side wall of the second unit; the inner side wall of the second unit comprises a second unit inner side wall first section, a second unit inner side wall second section, a second unit inner side wall third section and a second unit inner side wall fourth section which are sequentially connected; the outer side wall of the second unit comprises a second unit outer side wall first section and a second unit outer side wall second section, the second unit outer side wall first section is connected with the first unit, the second unit outer side wall second section is a second arc surface, the center of the second arc surface is a second center, the center of the stator yoke is a first center, a plurality of second centers form an equivalent circle with the first center as the center; the second unit inner side wall first section is connected with the first unit, the second unit inner side wall second section is a third arc surface, the second unit inner side wall fourth section is a fourth arc surface, and the centers of the third arc surface and the fourth arc surface are located on the equivalent circle; an insulating sheet is inserted between the framework and the stator yoke, and at least part of the end of the insulating sheet along the circumference of the stator assembly is located in the notch corresponding to the second unit inner side wall first section; a casing, which is located outside the rotor assembly and the stator assembly, is made of magnesium-aluminum alloy.

2. The electric machine of claim 1, wherein, a notch is arranged at the outer side wall of the second unit, and the outer side wall of the first unit is a first arc surface with the first center as the center; the central angle a1 of the outer side wall of the first unit ranges from 26° to 29°, the central angle a2 of the second unit outer side wall second section ranges from 55° to 60°, the diameter D1 of the first arc surface ranges from 16mm to 18mm, the diameter D2 of the second arc surface ranges from 4mm to 6mm, the diameter D3 of the equivalent circle ranges from 11mm to 13mm, and the average wall thickness L of the stator yoke ranges from 1.18mm to 2.2mm.

3. The electric machine of claim 2, wherein, the diameter D4 of the third arc surface and the fourth arc surface ranges from 2mm to 4mm, and the central angle a4 of the third arc surface and the fourth arc surface ranges from 38° to 40°.

4. The electric machine of claim 3, wherein, the second units adjacent to each other are connected through a third unit, a protruding portion protruding inward along the radial direction is arranged on the inner side wall of the third unit, and a through hole is arranged at the protruding portion.

5. The electric machine of claim 4, wherein, the motor further comprises a fastener, which can pass through the through hole to connect the stator assembly and the casing; alternatively, the motor further comprises a limiting piece, which is connected with the casing and can extend into the through hole. Alternatively, the motor further comprises a limiting member and a fastener, the fastener being capable of penetrating through part of the through hole to connect the stator assembly and the casing, the limiting member being connected with the casing, and the limiting member being capable of extending into part of the through hole.

6. The electric machine of claim 1, wherein, The casing comprises an inner casing, an outer casing and a plurality of air guide fins, the outer casing being sleeved outside the inner casing, the inner casing and the outer casing being connected through the air guide fins, an air duct being formed between adjacent air guide fins, and the number n of the air guide fins being in the range of 5≤n≤12.

7. The electric machine of claim 6, wherein, The stator assembly extends radially into the air duct.

8. The electric machine of claim 6, wherein, The inner casing and the outer casing are both hollow cylindrical; alternatively, the inner casing and the outer casing are both hollow cubic; alternatively, the inner casing and the outer casing are both conical barrel-shaped, and the radial dimensions of the inner casing and the outer casing gradually decrease along the direction of airflow.

9. The electric machine of claim 1, wherein, A sound resistance member is arranged between the rotor assembly and the casing, and the sound resistance member is made of copper, steel or zinc.

10. The electric machine of claim 9, wherein, The sound resistance member and the casing are integrally formed by die casting.

11. The electric machine of claim 9, wherein, The rotor assembly comprises a rotor shaft and a bearing, the bearing being sleeved on the rotor shaft, the rotor shaft and the sound resistance member being connected through the bearing, and a damping member being arranged between the bearing and the sound resistance member.

12. The electric machine of claim 1, wherein, The framework and the stator tooth portion are integrally formed by injection molding.

13. A hair care appliance characterised in that, The motor comprises any one of claims 1 to 12.

14. The hair care appliance of claim 13, wherein, The hair care appliance further comprises a plurality of blades, the plurality of blades being distributed in a circumferential direction and connected with the rotor assembly, the width of the blades gradually increasing along the radial direction from the center to the periphery of the rotor assembly, and the included angle between the blades and the axis of the rotor assembly gradually increasing.

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