CN114825681A

CN114825681A - Motor and hair care implement

Info

Publication number: CN114825681A
Application number: CN202110108115.2A
Authority: CN
Inventors: 刘旭初; 余亮; 孙浩然
Original assignee: Kingclean Electric Co Ltd; Jiangsu Kingclean Intelligent Appliance Co Ltd
Current assignee: Kingclean Electric Co Ltd; Jiangsu Kingclean Intelligent Appliance Co Ltd
Priority date: 2021-01-27
Filing date: 2021-01-27
Publication date: 2022-07-29

Abstract

The invention relates to a motor and a hair care appliance. The motor includes: a rotor assembly; the stator assembly is sleeved outside the rotor assembly and comprises a stator yoke part and a stator tooth part, the stator yoke part comprises a plurality of connecting parts, each connecting part is connected with one stator tooth part, and at least one side of the region of the connecting part on the stator yoke part is provided with a notch along the circumferential direction; the casing, the casing is located the rotor subassembly with stator module's outside, the material of casing is magnesium aluminum alloy. This motor volume is littleer with weight for the volume and the weight of the hair care implement of using this motor are also littleer, are difficult for feeling tired when using for a long time, are convenient for more store and go out to carry.

Description

Motor and hair care implement

Technical Field

The invention relates to the technical field of motors, in particular to a motor and a hair care appliance.

Background

In daily life, after the hair is washed, if moisture on the hair is naturally evaporated, the hair needs to wait for a long time, and the hair dryer can accelerate the hair drying, so that the waiting time is shortened, and great convenience is brought to the life of people. Generally, a blower is provided with a motor and a blade, and the blade is driven to rotate by the motor, so that the air flow is accelerated, and hair is dried more easily. However, in some existing hair dryers, the volume of the motor is large, which results in large volume and weight of the whole hair dryer, and the hair dryer is tired when being used for a long time and is inconvenient to store and carry.

Disclosure of Invention

Based on the above, the invention provides a motor which is smaller in size and weight, so that a hair care appliance using the motor is smaller in size and weight, is not easy to feel tired after being used for a long time, and is more convenient to store and carry when going out.

An electric machine comprising:

a rotor assembly;

the stator assembly is sleeved outside the rotor assembly and comprises a stator yoke part and a stator tooth part, the stator yoke part comprises a plurality of connecting parts, each connecting part is connected with one stator tooth part, and at least one side of the region where the connecting part is located on the stator yoke part is provided with a notch along the circumferential direction;

the casing, the casing is located the rotor subassembly with stator module's outside, the material of casing is magnesium aluminum alloy.

In one embodiment, the notches are formed on both sides of the region of the connecting portion of the stator yoke portion in the circumferential direction.

In one embodiment, the stator yoke includes a plurality of first units, the connecting portion is located at the first unit, and along a circumferential direction, two sides of the first unit are respectively connected with a second unit, the outer sidewall of the second unit is provided with the notch, the outer sidewall of the first unit is a first arc surface taking the center of the stator yoke as a first circle center, the outer sidewall of the second unit includes a first section of the outer sidewall of the second unit and a second section of the outer sidewall of the second unit, the first section of the outer sidewall of the second unit is connected with the first unit, the second section of the outer sidewall of the second unit is a second arc surface, the circle center of the second arc surface is a second circle center, and a plurality of second circle centers form an equivalent circle taking the first circle center as a circle center;

the central angle a of the outer side wall of the first unit ₁ The range of alpha is more than or equal to 26 degrees ₁ Less than or equal to 29 degrees, and the central angle a of the second section of the outer side wall of the second unit ₂ A is within the range of 55 degrees to a ₂ Less than or equal to 60 degrees, and the diameter D of the first cambered surface ₁ D is within the range of 16mm ₁ Not more than 18mm, the diameter D of the second cambered surface ₂ D is within the range of 4mm or less ₂ Less than or equal to 6mm, the diameter D of the equivalent circle ₃ D is within the range of 11mm ₃ Not more than 13mm, and the range of the average wall thickness L of the stator yoke part is not less than 1.18mm and not more than 2.2 mm.

In one embodiment, the inner side wall of the second unit is provided with the notch, the inner side wall of the second unit comprises a first section of the inner side wall of the second unit, a second section of the inner side wall of the second unit, a third section of the inner side wall of the second unit and a fourth section of the inner side wall of the second unit, which are sequentially connected, the first section of the inner side wall of the second unit is connected with the first unit, the second section of the inner side wall of the second unit is a third arc surface, the fourth section of the inner side wall of the second unit is a fourth arc surface, and the circle centers of the third arc surface and the fourth arc surface are positioned on the equivalent circle;

diameter D of the third cambered surface and the fourth cambered surface ₄ D is within the range of 2mm or less ₄ Not more than 4mm, and the central angle a of the third cambered surface and the fourth cambered surface ₄ The range of alpha is more than or equal to 38 degrees ₄ ≤40°。

In one embodiment, adjacent second units are connected through a third unit, a protrusion protruding inwards in the radial direction is arranged on the inner side wall of the third unit, and a through hole is formed in the protrusion.

In one embodiment, the motor further comprises a fastener capable of passing through the through hole to connect the stator assembly with the casing;

or, the motor further comprises a limiting piece, the limiting piece is connected with the casing, and the limiting piece can extend into the through hole;

or, the motor further comprises a limiting piece and a fastening piece, the fastening piece can penetrate through part of the through hole to connect the stator assembly and the casing, the limiting piece is connected with the casing, and the limiting piece can extend into part of the through hole.

In one embodiment, the motor further comprises a casing, the casing comprises an inner casing, an outer casing and a plurality of air guide sheets, the outer casing is sleeved outside the inner casing, the inner casing and the outer casing are connected through the air guide sheets, an air duct is formed between the adjacent air guide sheets, and the number n of the air guide sheets is within the range of 5-12.

In one embodiment, the stator assembly extends radially into the air duct.

In one embodiment, the inner shell and the outer shell are both hollow cylindrical; or the inner shell and the outer shell are both in a hollow cube shape; or the inner shell and the outer shell are both in a conical barrel shape, and the radial sizes of the inner shell and the outer shell are gradually reduced along the airflow flowing direction.

In one embodiment, a sound-blocking member is arranged between the rotor assembly and the casing, and the sound-blocking member is made of copper, steel or zinc.

In one embodiment, the sound-blocking member is integrally formed with the housing by die-casting.

In one embodiment, the rotor assembly comprises a rotor shaft and a bearing, the bearing is sleeved on the rotor shaft, the rotor shaft is connected with the sound-blocking piece through the bearing, and a damping piece is arranged between the bearing and the sound-blocking piece.

Stator module still includes the skeleton, the skeleton with stator tooth portion is through moulding plastics integrated into one piece.

In the motor, the stator yoke part is provided with the connecting parts used for being connected with the stator tooth part, and the gap is arranged in the area of at least one side of the connecting part on the stator yoke part, so that the size and the volume of the stator component can be reduced, and the weight of the motor is reduced; secondly, the gap area is positioned at the position of at least one side of the connecting part, and the gap is arranged to enlarge the space of the area, so that the coil winding is easier to install; moreover, the connecting part of the stator yoke part and the stator tooth part is avoided by the area, and the performance of the motor is not influenced. In addition, the shell is made of magnesium-aluminum alloy, the density is low, the weight of the shell can be reduced, and the weight of the motor is reduced. This motor is guaranteeing under the not influenced condition of performance, can reduce volume and weight to a certain extent for the volume and the weight of the hair care implement of using this motor are also littleer, and easily install parts such as winding, are difficult for feeling tired when using for a long time, are convenient for more store and go out to carry.

The invention also provides a hair care appliance, and the volume and the weight of the motor applied in the hair care appliance are smaller, so that the hair care appliance is smaller in volume and weight, less prone to fatigue after being used for a long time, and more convenient to store and carry when being out.

A hair care appliance comprises the motor.

In one embodiment, the hair care appliance further comprises a plurality of blades distributed along the circumferential direction and connected with the rotor assembly, the width of the blades is gradually increased 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 is gradually increased.

According to the hair care appliance, the stator yoke part of the motor is provided with the plurality of connecting parts for being connected with the stator tooth parts, and the gap is arranged in the area of at least one side of the connecting parts on the stator yoke part, so that the size and the volume of the stator assembly can be reduced, and the weight of the motor can be reduced; secondly, the gap area is positioned at the position of at least one side of the connecting part, and the gap is arranged to enlarge the space of the area, so that the coil winding is easier to install; moreover, the connecting part of the stator yoke part and the stator tooth part is avoided by the area, and the performance of the motor is not influenced. In addition, the shell is made of magnesium-aluminum alloy, the density is low, the weight of the shell can be reduced, and the weight of the motor is reduced. This motor is guaranteeing under the not influenced condition of performance, can reduce volume and weight to a certain extent for the volume and the weight of hair nursing utensil are also littleer, and easily install parts such as winding, are difficult for feeling tired when using for a long time, are convenient for more store and go out to carry.

Drawings

FIG. 1 is a schematic structural diagram of a motor and fan blades according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of the motor and fan blade of FIG. 1;

FIG. 3 is a schematic structural diagram of a stator assembly of the electric machine of FIG. 1;

FIG. 4 is a schematic structural diagram of a rotor assembly and fan blades of the motor shown in FIG. 1;

FIG. 5 is an exploded view of a stator assembly of the electric machine of FIG. 1;

fig. 6 is a sectional view of a partial structure of a stator assembly of the motor of fig. 1;

figure 7 is a top view of a stator yoke of a prior art electric machine;

FIG. 8 is a top view of a stator yoke of the motor of FIG. 1;

FIG. 9 is a top view of a stator yoke of the motor of FIG. 1;

FIG. 10 is a magnetic circuit simulation of the stator assembly of the electric machine of FIG. 1;

FIG. 11 is a torque parameter of the motor of FIG. 1;

FIG. 12 is a back emf parameter of the motor of FIG. 1;

FIG. 13 is a graph of the air gap flux density parameter for the machine of FIG. 1;

FIG. 14 is a stator core yoke magnetic density parameter for the machine of FIG. 1;

FIG. 15 is a stator core tooth flux density parameter for the motor of FIG. 1;

FIG. 16 is a cross-sectional view of a rotor assembly and fan blades of the motor of FIG. 1;

FIG. 17 is a top view of a portion of the fan blade of FIG. 1;

FIG. 18 is a cross-sectional view taken at g of FIG. 17;

FIG. 19 is a cross-sectional view taken at h of FIG. 17;

FIG. 20 is a cross-sectional view taken at i in FIG. 17;

fig. 21 is a schematic structural diagram of a housing of the motor in fig. 1.

Reference numerals:

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

the rotor assembly 200, the rotor shaft 210, the groove 211, the rotor magnetic ring 220, the first bearing 231, the second bearing 232 and the bearing positioning piece 240;

fan blade 300, fan blade connection part 310, and blade 320;

the air duct comprises a machine shell 400, an inner shell 410, hole sites 411, an outer shell 420, an air duct 430 and air guide sheets 440;

a stopper 500;

the acoustic resistance member 600.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the second feature or the first and second features may be indirectly contacting each other through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1 and 2, an electric machine according to an embodiment of the present invention includes a stator assembly 100, a rotor assembly 200, and a casing 400. The stator assembly 100 is sleeved outside the rotor assembly 200, the casing 400 is located outside the stator assembly 100 and the rotor assembly 200, and each component inside the casing 400 is supported and protected by the casing 400 to prevent foreign objects from entering the casing, and the casing is not easily affected by the outside during operation.

Referring to fig. 5 to 9, the stator assembly 100 includes a stator core including a stator yoke 110 and stator teeth 120, the stator teeth 120 are located inside the stator yoke 110, the stator yoke 110 includes a plurality of connection portions, each stator tooth 120 is connected to one of the connection portions, and the stator teeth 120 are provided with windings 140. Stator yoke 110 is provided with a plurality of notches, and the volume and weight of stator yoke 110 are reduced by digging the notches in stator yoke 110. Specifically, the above-described notch is provided in at least one side region of the stator yoke 110 where the connecting portion is located in the circumferential direction. The connecting part of the stator yoke 110 and the stator tooth part 120 is avoided by the notch area, so that the notch area is made of a material, the connection between the stator yoke 110 and the stator tooth part 120 is not affected, and the performance of the motor is not affected. In addition, the space of the notch region is increased, so that when the components such as the stator tooth portion 120 and the winding 140 are mounted, the components can be avoided, the mounting is easier, the distribution among the components can be more compact, and the overall size of the motor can be reduced.

Further, the above-mentioned notches are provided in both side regions of the region where the connecting portion is located on the stator yoke 110 in the circumferential direction. In this way, the volume and weight of stator yoke 110 can be further reduced, and when the components such as stator teeth 120 and windings 140 are mounted, both sides can be retracted, and the mounting is further facilitated.

Preferably, the stator yoke 110 and the stator teeth 120 are connected by a snap fit, so that the assembly is easy, and the disassembly and maintenance are convenient. Further, a locking block 121 is disposed on the stator tooth portion 120, and a plurality of locking grooves 1111 are disposed on the stator yoke portion 110, where the locking grooves 1111 are the above-mentioned connecting portion. A locking block 121 is locked in each locking groove 1111, so that the stator yoke 110 and the stator teeth 120 are connected. Of course, the positions of the clamping groove and the clamping block can be changed. The stator yoke 110 and the stator teeth 120 may be bonded to each other to be more firmly fixed.

Preferably, the locking groove 1111 may be a dovetail groove, and the shape and size of the locking block 121 match the dovetail groove. The width of the groove bottom of the dovetail groove is larger than that of the notch, the clamping block 121 is not easy to fall off after being clamped, and the fixation is more stable.

Preferably, referring to fig. 8 and 9, the stator yoke 110 includes a plurality of first units 111, and the above-mentioned slot 1111 is disposed at an inner sidewall of the first unit 111. The first unit outer sidewall 1112 is a first arc surface, and a first center O of the first arc surface coincides with the center of the stator core. Along the circumferential direction, two sides of the first unit 111 are respectively connected with a second unit 112, the outer sidewall of the second unit 112 includes a second unit outer sidewall first segment 1121 and a second unit outer sidewall second segment 1122, wherein the second unit outer sidewall first segment 1121 is connected with the first unit outer sidewall 1112. Outside the second unitThe second section 1122 of the sidewall is a second arc surface, and the center of the second arc surface is a second center O ₁ . Second center O of the plurality of second cambered surfaces ₁ Forming an equivalent circle 1127 centered at the first center O. The second unit outer sidewall first segment 1121 may be flat or curved.

Specifically, the central angle a corresponding to the first arc surface (the first unit outer sidewall 1112) is ₁ The range of alpha is more than or equal to 26 degrees ₁ Less than or equal to 29 degrees and diameter D ₁ D is within the range of 16mm ₁ Less than or equal to 18 mm. Diameter D of equivalent circle 1127 ₃ D is within the range of 11mm ₃ Less than or equal to 13mm, the diameter D of the second cambered surface (the second section 1122 of the outer side wall of the second unit) ₂ D is within the range of 4mm or less ₂ Less than or equal to 6mm, corresponding central angle a ₂ The range of alpha is more than or equal to 55 degrees ₂ ≤60°。

The above condition is satisfied, and the notches 190 are formed at the outer sidewalls of the second cells 112 at both sides of the first cell 111. In addition, a notch is also formed at an inner sidewall of the second unit 112. The average wall thickness L of the stator yoke 110 is 1.18mm or more and 2.2mm or less. In this range of wall thickness, the magnetic density at stator yoke 110 is not saturated by the cut-off material.

Further, the notch at the inner side wall of the second unit 112 satisfies the following condition. The inner sidewall of the second unit 112 includes a second unit inner sidewall first section 1123, a second unit inner sidewall second section 1124, a second unit inner sidewall third section 1125 and a second unit inner sidewall fourth section 1126 which are connected in sequence. Wherein the second cell inner sidewall first section 1123 is connected to the inner sidewall of the first cell 111. The second section 1124 of the second unit inner side wall is a third arc surface, and the fourth section 1126 of the second unit inner side wall is a fourth arc surface. The center of the third cambered surface and the fourth cambered surface and the second center O ₁ And (4) overlapping. The second cell inner sidewall first segment 1123 and the second cell inner sidewall third segment 1125 may be flat or curved.

Specifically, the diameter D of the third arc surface (the second section 1124 of the second unit inner sidewall) and the fourth arc surface (the fourth section 1126 of the second unit inner sidewall) ₄ D is within the range of 2mm or less ₄ Not more than 4mm, corresponding central angle a ₄ The range of the alpha is more than or equal to 38 degrees ₄ Is less than or equal to 40 degrees. The notches 190 are also formed at the inner sidewalls of the second cells 112 at both sides of the first cell 111, satisfying the above conditions.

Referring to fig. 6 to 9, in comparison with the conventional stator yoke portion shown in fig. 7, in fig. 6, after notches are formed at inner sidewalls of the second units 112 at both sides of the first unit 111, a space for accommodating the windings 140 is increased, and the windings 140 are more easily operated when being installed.

Further, two second cells 112 located between two first cells 111 are connected by a third cell 113, the third cell outer side wall 1131 is an arc surface coplanar with the first arc surface, and the corresponding central angle a of the third cell outer side wall 1131 ₃ The range of alpha is more than or equal to 35 degrees ₃ ≤40°。

Further, the third unit inner side wall 1133 protrudes inward in the radial direction to form the protrusion 1132. The total volume of all the protrusions 1132 on the stator yoke 110 is less than the total volume of all the notches, so that the total volume and mass of the stator yoke 110 are not increased by the protrusions 1132. The protrusion 1132 is provided with a through hole 1134, which may be used to fix or limit the stator assembly 100. Thus, the mounting or spacing of the stator assembly 100 may be facilitated while the overall volume and mass are still reduced.

Specifically, referring to fig. 5 to 7 and 21, a hole 411 is also disposed at a position on the casing 400 corresponding to the through hole 1134, the position of the hole 411 is connected with a limiting member 500, and after the stator assembly 100 is installed in the casing 400, the limiting member 500 is inserted into the through hole 1134 to limit the position of the stator assembly 100, thereby ensuring the accuracy of the position. Stator assembly 100 may be secured to casing 400 by interference fit and/or bonding. Preferably, the through hole 1134 is a special-shaped hole to enhance the limiting effect between the limiting member 500 and the through hole 1134.

Or, the hole 411 is selected to be circular, so that the threaded fastener sequentially passes through the through hole 1134 and the hole 411, thereby fixedly connecting the stator assembly 100 and the casing 400.

Or, part of the through holes 1134 are circular, the through holes 1134 and the hole 411 are provided with threaded fasteners, so that the stator assembly 100 and the casing 400 are fixed, part of the through holes 1134 are special-shaped holes, and the through holes 1134 and the hole 411 are provided with the position limiting members 500, so that the position limitation between the stator assembly 100 and the casing 400 is enhanced.

In the conventional stator yoke structure shown in fig. 7, in order to fix the stator assembly 100 to the casing 400, an additional fixing structure is generally required to be added on the outer side of the stator assembly 100, so that the structure is complicated and the outer ring size is large. In addition, the air duct space inside the casing 400 is also reduced, which is not favorable for heat dissipation. After the through holes 1134 are formed in the stator yoke 110 in the above manner, the size of the outer ring of the stator yoke is not increased, the arrangement among the components is more compact, the size reduction is facilitated, and the heat dissipation is not affected.

With continued reference to fig. 8 and 9, in some embodiments, the through-hole 1134 is a shaped hole, and the through-hole outer side wall 11341 is an arc surface with a diameter D of the arc surface and a first circle center O as a circle center ₅ D is within a range of 14mm or less ₅ Less than or equal to 16 mm. The first section 11342 of the inner side wall of the through hole and the third section 11343 of the inner side wall of the through hole are both planes, and an included angle a is formed between the first section and the third section ₅ The range of alpha is more than or equal to 50 degrees ₅ Is less than or equal to 70 degrees. The third unit inner side wall 1133 and the fourth section 11344 of the through hole inner side wall are both arc surfaces with the same circle center, and the diameter D of the fourth section 11344 of the through hole inner side wall ₆ D is within the range of 2mm or less ₆ Not more than 3mm, diameter D of the third unit inner side wall 1133 ₇ D is within the range of 3mm or less ₇ ≤4mm。

Referring to fig. 10, when stator yoke 110 and stator teeth 120 have the structure shown in fig. 6, it can be seen from the magnetic circuit simulation diagram that the magnetic circuit is complete although there is a gap. When the average wall thickness around the through-hole 1134 is close, the simulation results of the through-hole 1134 being a shaped hole or a circular hole are similar, so the simulation results of the shaped hole are omitted here.

Referring to fig. 11, the theoretical torque range of the motor is between 0.004 and 0.005, the torque waveform in fig. 11 is stable, and the value is maintained between 0.004 and 0.005, which meets the requirement of the motor design for torque parameters, and illustrates that although there is a gap, the gap does not affect the torque of the motor.

Referring to fig. 12, the back electromotive force waveform of the motor tends to be domain sinusoidal, so that the harmonic wave is small, the efficiency is high, the harmonic wave vibration is small, and the motor vibration noise is low.

Referring to fig. 13, the air gap flux density exhibits a trend of increasing and decreasing, which is consistent with the design requirements of the motor, and can provide sufficient magnetic flux.

Referring to fig. 14 and 15, in designing the motor, the magnetic density of the stator yoke is required to be within 1.5T, and the magnetic density of the stator teeth is required to be within 1.6T. As can be seen from the figure, the magnetic density of the stator yoke 110 is within 1.4T, and the magnetic density of the stator teeth 120 is within 1.6T, so that the magnetic saturation phenomenon does not occur, and the motor efficiency is not lowered.

Also, the volume of the stator yoke shown in fig. 7 was 1350mm by simulation calculation ³ The volume range of the stator yoke 110 shown in fig. 8 is 900-1050mm ³ . Wherein the outer side wall diameter of the conventional stator yoke shown in fig. 7 is equal to the outer side wall diameter of the first cell 111 of the stator yoke 110 shown in fig. 8; the diameter of the inner side wall of the conventional stator yoke shown in fig. 7 is equal to the diameter of the inner side wall of the first unit 111 of the stator yoke 110 shown in fig. 8, and the dovetail grooves are provided in equal sizes.

According to the parameters, when the stator yoke 110 is arranged according to the structure, the performances of the stator yoke are not affected, less materials can be used on the premise of ensuring the performances of the motor, and the motor with smaller volume and mass is manufactured.

Referring to fig. 5 and 6, additional components of the stator assembly 100 are illustrated. In order to facilitate winding of the coil, a frame 130 is disposed outside the stator teeth 120, a mounting groove 131 is disposed on the frame 130, the stator teeth 120 are mounted in the mounting groove 131, and the winding 140 is disposed on the frame 130. The pins 150 are connected to the windings 140 and to the PCB board 180. The insulation sheet 160 is inserted between the bobbin 130 and the stator yoke 110, and one side surface thereof is attached to the stator yoke 110. The cover plate 170 is fixed to an end of the stator yoke 110, and the cover plate 170 is provided with an avoiding hole 171 corresponding to the through hole 1134 for avoiding the stopper 500 or the threaded fastener.

Preferably, the bobbin 130 and the stator teeth 120 are integrally formed by injection molding. Compare with conventional interference fit, with the two integrated into one piece back, can not produce the striking between the two when the motor vibrates, can reduce the noise.

Referring to fig. 2 and 21, the material of the casing 400 is preferably magnesium aluminum alloy. The lower density of the magnesium aluminum alloy enables the weight of the housing 400 to be lighter, and thus the overall weight of the motor to be lighter.

Further, the casing 400 includes an inner casing 410, air guiding sheets 440 and an outer casing 420, the outer casing 420 is located outside the inner casing 410, the air guiding sheets 440 are located between the inner casing 410 and the outer casing 420, and partition the inner casing 410 and the outer casing 420 to form a plurality of air channels 430 for passing air, and the air channels 430 extend along an axial direction of the rotor assembly 200. The air guide piece 440 can guide the airflow to make the airflow flow in a predetermined direction, and is not easy to generate turbulence.

Preferably, the inner shell 410 and the outer shell 420 are both hollow cylinders, and the cylindrical cylinders are difficult to manufacture. Alternatively, it may be formed in a hollow cube shape. Alternatively, the inner casing 410 and the outer casing 420 may have a tapered barrel shape, and the radial dimension thereof gradually decreases in the airflow direction. Therefore, the air speed of the air outlet can be increased.

The wind-guiding plate 440 is perpendicular to the outer wall of the inner casing 410 and the inner wall of the outer casing 420, or the wind-guiding plate 440 may be spiral.

If the number of the wind-guiding sheets 440 is too large, the weight of the casing 400 may be too large, and if the number is too small, the connection strength between the inner casing 410 and the outer casing 420 may be weak, and the wind-guiding effect may be poor. Therefore, the number n of the air guide pieces 440 is preferably in the range of 5. ltoreq. n.ltoreq.12. Further, n is 7, 8 or 9. When the range is selected, the weight, the connection strength and the wind guiding effect can be considered at the same time.

Preferably, the stator assembly 100 extends radially between the inner and

outer housings

410, 420 within the air duct 430. As such, heat dissipation to the stator assembly 100 can be enhanced as the airflow passes through the air duct 430.

Preferably, a sound blocking member 600 is disposed between the rotor assembly 200 and the inner case 410, and noise is reduced by the sound blocking member 600. Specifically, the acoustic resistance member 600 is made of copper, steel, or zinc. The sound resistance of the materials is large, so that the resistance of noise transmission can be increased, and the noise is reduced.

In some embodiments, the casing 400 is made of magnesium-aluminum alloy, and the acoustic resistance element 600 is disposed between the rotor assembly 200 and the inner casing 410. The acoustic resistance member 600 increases the weight, and the magnesium-aluminum alloy with a lighter material is selected as the casing 400 to reduce the weight, so that the weight and the magnesium-aluminum alloy offset each other, and the noise can be reduced under the condition that the weight is basically unchanged or even reduced.

Preferably, the acoustic resistance member 600 is integrally formed with the inner case 410 by die casting. Thus, when the motor vibrates, the sound resistor 600 does not collide with the housing 400, and noise can be reduced. The outer sidewall of the acoustic barrier 600 matches the inner sidewall of the inner housing 410 in shape and size, and fits between them. For example, the inner casing 410 and the acoustic barrier 600 are both hollow cylindrical or hollow square.

Referring to fig. 2, 4 and 16, the rotor assembly 200 includes a rotor shaft 210 and a rotor magnet ring 220, and the rotor magnet ring 220 extends into the stator assembly 100. The rotor magnetic ring 220 is sleeved on the rotor shaft 210 and fixedly connected with the rotor shaft. The rotor shaft 210 is further provided with a first bearing 231 and a second bearing 232, and the first bearing 231 and the second bearing 232 are connected to the aforementioned acoustic resistor 600.

The sound-blocking member 600 is sleeved outside the first bearing 231 and the second bearing 232, and preferably, a shock-absorbing member is disposed between the sound-blocking member 600 and the bearings to reduce vibration and noise of the sound-blocking member 600 and the casing 400. The shock-absorbing member can be made of rubber, silica gel or foam and the like.

Preferably, the rotor shaft 210 is provided with a groove 211 for limiting an end of the first bearing 231 so that it is not easily displaced.

The rotor shaft 210 and the rotor magnetic ring 220 are fixed by adhesion and/or interference fit. Preferably, the outer circumferential surface of the rotor shaft 210 is provided with a plurality of ring grooves for receiving glue when bonding.

Preferably, a bearing positioning element 240 is disposed between the first bearing 231 and the second bearing 232, and is used for axially limiting the first bearing 231 and the second bearing 232, so that the first bearing 231 and the second bearing 232 are not easy to displace.

In some embodiments, the hair care appliance comprises the motor of any of the embodiments described above, with the benefits of the motor of any of the embodiments described above. The hair care appliance may be a hair dryer, which can be used for drying hair or pet hair.

The hair care appliance is provided with fan blades 300, the fan blades 300 are fixedly connected with the rotor shaft 210, and the rotor shaft 210 drives the fan blades 300 to rotate so as to realize air supply. The fan blade 300 includes a fan blade connector 310 and a plurality of blades 320, the blades 320 are fixedly connected to the fan blade connector 310, and the plurality of blades 320 are circumferentially distributed on an outer circumferential surface of the fan blade connector 310.

Referring to fig. 17 to 20, preferably, the width of the vane 320 gradually increases along a radial direction from the center to the outer periphery of the rotor shaft 210, and the included angle between the vane 320 and the axis of the rotor shaft 210 gradually increases, that is, the inclination angle of the vane 320 relative to the axis of the rotor shaft 210 gradually increases. As such, the closer to the rotor shaft 210, the more parallel the blades 320 tend to be to the rotor shaft 210. The smaller the space near the rotor shaft 210, the more the blades 320 are parallel to the rotor shaft 210, which enables a larger number of blades 320 to be accommodated, a higher density of blades 320, and a more efficient wind force to be blown. The smaller width of the blades 320 near the rotor shaft 210 may further increase the number of blades 320 that can be accommodated. The area further from the rotor shaft 210 is sufficiently spacious to increase the width of the blades 320 and the angle between the blades 320 and the axis of the rotor shaft 210.

In some embodiments, three positions are taken on the blade 320 in a radial direction from the center to the outer periphery of the rotor shaft 210, a first position, a second position, and a third position, respectively. The distance g between the first position and the rotor shaft 210 is 8mm, the width b of the blade 320 at the first position ranges from 7mm to 8mm, the included angle a between the blade 320 at the first position and the end surface of the rotor shaft 210 ranges from 30 degrees to 40 degrees, namely, the included angle a' between the blade 320 at the first position and the axis of the rotor shaft 210 ranges from 50 degrees to 60 degrees. The distance h between the second position and the rotor shaft 210 is 10mm, the width d of the blade 320 at the second position ranges from 8mm to d 9mm, the included angle c between the blade 320 at the second position and the end surface of the rotor shaft 210 ranges from 20 degrees to c 35 degrees, namely, the included angle c 'between the blade 320 at the second position and the axis of the rotor shaft 210 ranges from 55 degrees to c' to 70 degrees. The distance i between the third position and the rotor shaft 210 is 12mm, the width f of the blade 320 at the third position is within the range of 9mm to 10mm, the included angle e between the third position of the blade 320 and the end surface of the rotor shaft 210 is within the range of 20 degrees to 30 degrees, namely, the included angle e' between the third position of the blade 320 and the axial line of the rotor shaft 210 is within the range of 60 degrees to 70 degrees. In the present embodiment, it can be seen from the above dimensions that the width of the blades 320 at a position close to the rotor shaft 210 is smaller, and the blades 320 are more close to being parallel to the rotor shaft 210, the number of the blades 320 that can be accommodated can be increased, the density of the blades 320 is greater, the wind force to be blown out is more sufficient, and it is more convenient to mount the blades 320.

Preferably, there are 10, 11 or 12 blades 320. At this time, the blown wind is sufficient, and the arrangement is not too dense, which is more convenient when installing the blades 320.

All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An electric machine, comprising:

a rotor assembly;

the stator assembly is sleeved outside the rotor assembly and comprises a stator yoke part and a stator tooth part, the stator yoke part comprises a plurality of connecting parts, each connecting part is connected with one stator tooth part, and at least one side of the region of the connecting part on the stator yoke part is provided with a notch along the circumferential direction;

2. The electric machine of claim 1, wherein the notches are provided on both sides of the region of the stator yoke where the connecting portion is located in a circumferential direction.

3. The motor of claim 2, wherein the stator yoke comprises a plurality of first units, the connecting portion is located at the first unit, a second unit is connected to each of two sides of the first unit along a circumferential direction, the outer sidewall of the second unit is provided with the notch, the outer sidewall of the first unit is a first arc surface with a center of the stator yoke as a first circle center, the outer sidewall of the second unit comprises a second unit outer sidewall first section and a second unit outer sidewall second section, the second unit outer sidewall first section is connected with the first unit, the second unit outer sidewall second section is a second arc surface with a circle center as a second circle center, and a plurality of second circle centers form an equivalent circle with the first circle center as a circle center;

the central angle a of the outer side wall of the first unit ₁ The range of alpha is more than or equal to 26 degrees ₁ Less than or equal to 29 degrees, and the central angle a of the second section of the outer side wall of the second unit ₂ The range of alpha is more than or equal to 55 degrees ₂ Less than or equal to 60 degrees, and the diameter D of the first cambered surface ₁ D is within the range of 16mm ₁ Not more than 18mm, the diameter D of the second cambered surface ₂ D is within the range of 4mm or less ₂ Less than or equal to 6mm, the diameter D of the equivalent circle ₃ D is within the range of 11mm ₃ The diameter of the stator yoke is not more than 13mm, and the range of the average wall thickness L of the stator yoke is not less than 1.18mm and not more than 2.2 mm;

preferably, the inner side wall of the second unit is provided with the notch, the inner side wall of the second unit comprises a first section of the inner side wall of the second unit, a second section of the inner side wall of the second unit, a third section of the inner side wall of the second unit and a fourth section of the inner side wall of the second unit, which are sequentially connected, the first section of the inner side wall of the second unit is connected with the first unit, the second section of the inner side wall of the second unit is a third cambered surface, the fourth section of the inner side wall of the second unit is a fourth cambered surface, and the circle centers of the third cambered surface and the fourth cambered surface are positioned on the equivalent circle;

diameter D of the third cambered surface and the fourth cambered surface ₄ D is within the range of 2mm or less ₄ Not more than 4mm, and the central angle a of the third cambered surface and the fourth cambered surface ₄ The range of alpha is more than or equal to 38 degrees ₄ ≤40°；

Preferably, the adjacent second units are connected through a third unit, a protruding part protruding inwards in the radial direction is arranged on the inner side wall of the third unit, and a through hole is formed in the protruding part;

preferably, the motor further comprises a fastener capable of passing through the through hole to connect the stator assembly with the casing;

or, the motor further includes a limiting member, the limiting member is connected to the casing, and the limiting member can extend into the through hole;

4. The motor according to claim 1, wherein the casing comprises an inner casing, an outer casing and a plurality of air guide sheets, the outer casing is sleeved outside the inner casing, the inner casing is connected with the outer casing through the air guide sheets, an air duct is formed between the adjacent air guide sheets, and the number n of the air guide sheets is within the range of 5-12;

preferably, the stator assembly extends radially into the air duct;

preferably, the inner shell and the outer shell are both in a hollow cylinder shape; or the inner shell and the outer shell are both in a hollow cube shape; or the inner shell and the outer shell are both in a conical barrel shape, and the radial sizes of the inner shell and the outer shell are gradually reduced along the airflow flowing direction.

5. The electric machine of claim 1 wherein a acoustically resistive element is disposed between the rotor assembly and the housing, the acoustically resistive element being formed of copper, steel or zinc.

6. The electric machine of claim 5 wherein said acoustically resistive element is integrally formed with said housing by die casting.

7. The motor of claim 5, wherein the rotor assembly comprises a rotor shaft and a bearing, the bearing is sleeved on the rotor shaft, the rotor shaft is connected with the sound-blocking member through the bearing, and a damping member is arranged between the bearing and the sound-blocking member.

8. The electric machine of claim 1, wherein the stator assembly further comprises a backbone integrally formed with the stator teeth by injection molding.

9. A hair care appliance comprising the motor of any one of claims 1 to 8.

10. The hair care appliance of claim 9, further comprising a plurality of blades circumferentially distributed and connected to the rotor assembly, wherein the blades have a width that gradually increases in a radial direction from a center to an outer periphery of the rotor assembly, and wherein the blades have an angle with an axis of the rotor assembly that gradually increases.