Motor and cleaning device

Abstract

The present invention relates to a motor. The motor comprises: a rotor member comprising a yoke portion and a plurality of magnetic members distributed in the circumferential direction, wherein the plurality of magnetic members are connected to the yoke portion, and the distance between the side walls of the same sides of every two adjacent magnetic members in the circumferential direction forms a pole pitch; and a stator member comprising a plurality of tooth portions, wherein a pole shoe is formed at the end of each tooth portion facing away from the axis of the stator member, the ratio of the thickness of the yoke portion in the radial direction of the rotor member to each pole pitch is 0.2-0.3, and the ratio of an armature size formed by the stator member to the pole pitch is 0.46-0.50, such that the gap formed radially between the stator member and the rotor member and the ratio of overlapping areas between the pole shoes and the magnetic members in the circumferential direction are both in a preset range. The technical solution in embodiments of the present invention guarantees the overall uniformity of a magnetic circuit, thereby reducing the loss of the motor, and achieving the objective of improving the efficiency of the motor.

Description

Motors and cleaning equipment Technical Field

[0001] The present invention relates to the field of motors, and in particular to a motor for cleaning equipment and a cleaning equipment having the motor. Background Art

[0002] Motors are a common component in cleaning equipment. These high-speed motors are subject to stringent requirements for heat dissipation efficiency and motor power. Many manufacturers are optimizing the structure of stators and rotors, but most efforts are limited to optimizing motor power, such as changing the number of teeth and the shape of the slot bottom to increase the slot fill rate. However, one of the most significant drawbacks of current motor improvement solutions is the inability to ensure that the overall magnetic circuit uniformity remains within the preset range. This leads to persistent issues such as severe magnetic leakage and high motor losses, resulting in heat dissipation efficiency failing to meet preset requirements.

[0003] Summary of the Invention

[0004] Problems to be solved by the invention

[0005] In order to solve the problem that the heat dissipation efficiency of the motor cannot meet the demand, the embodiments of the present disclosure provide a motor and a cleaning device having the motor.

[0006] Solutions for solving problems

[0007] According to a first aspect of the present disclosure, an embodiment provides a motor, including a stator component and a magnetic rotor component. The stator component and the rotor component are coaxially arranged. When energized, the stator component has a magnetic field capable of driving the rotor component to rotate, thereby converting electrical energy of the stator component into mechanical energy for the rotation of the rotor component. The motor includes:

[0008] The rotor component includes a yoke and a plurality of magnetic components distributed along the circumferential direction. The plurality of magnetic components are connected to the yoke, and the distance between the same-side side walls of two adjacent magnetic components in the circumferential direction constitutes a pole pitch.

[0009] The stator element comprises a plurality of teeth, and a pole shoe is formed at the end of each tooth element away from the axis of the stator element.

[0010] The ratio of the thickness of the yoke in the radial direction of the rotor component to the pole pitch is 0.2-0.3, and the ratio of the size of the armature formed by the stator component to the pole pitch is 0.46-0.50, so that the gap formed in the radial direction of the stator component and the rotor component and the ratio of the facing area of ​​the pole shoe and the magnetic component in the circumferential direction are both within a preset range, and the size of the gap in the radial direction is 0.75-0.95 mm;

[0011] The calculation formula for the radial size of the gap is:

[0012] Where kx is the magnetic saturation coefficient, constant 1.1-1.35, k σ The air gap coefficient is 122, the constant is 1.15-1.25, B σ is the magnetic density of the air gap 122, unit T, δ is the air gap 122, unit mm, h m is the radial thickness of the magnetic part, μ0 is a constant of 4π*10 -7 , h c is the coercive force, unit is A / m.

[0013] Optionally, the stator member comprises: a stator slot, and an opening communicating with the inner and outer spaces of the stator slot;

[0014] The hollow volume gradually increases from the bottom of the stator slot along the radial direction of the stator component to the first position; and gradually decreases from the second position of the stator slot along the radial direction of the stator component to the opening; wherein the first position and the second position are both located between the bottom of the stator slot and the opening, and the second position is located between the first position and the opening.

[0015] Optionally, the hollow volume gradually decreases from the first position of the stator slot to the second position in the radial direction of the stator component, so as to accelerate the airflow out of the stator slot, so that the airflow velocity at the opening is greater than the airflow velocity in the gap.

[0016] Optionally, the stator component includes:

[0017] Coil winding;

[0018] a plurality of stacked stator laminations, each of the stator laminations having a plurality of teeth, the plurality of teeth being distributed along the circumference of the stator laminations, the plurality of teeth carrying the coil windings, and the stator slots being formed between two adjacent teeth;

[0019] The stator slot comprises: a slot body, a slot shoulder, and a slot opening that are interconnected, the slot shoulder being located between the slot body and the slot opening, the end of the slot opening facing away from the slot shoulder being the opening, and the stator slot bottom being the slot bottom of the slot body; the first position being located at a first end of the slot shoulder, and the second position being located at a second end of the slot shoulder, wherein the second end is opposite to the first end;

[0020] The cross section of the slot body is fan-shaped, and / or the cross section of the slot opening is trapezoidal; wherein the cross section is a cross section perpendicular to the axis of the stator component.

[0021] Optionally, the inner wall of the groove shoulder is an inclined surface that guides the fluid flowing from the groove body to the groove opening.

[0022] Optionally, the slope of the inner wall of the groove shoulder is different from the slope of the inner wall of the groove opening, and the angle formed by the inner wall of the groove shoulder and the waistline of the groove opening is 150-165°.

[0023] Optionally, the stator slot meets at least one of the following conditions:

[0024] The ratio between the width of the slot opening and the width of the bottom of the slot body (112a) is 0.7-0.9;

[0025] The ratio between the width of the bottom of the groove body (112a) and the width of the groove shoulder at the first position is: 0.3-0.6;

[0026] The ratio between the depth of the notch and the overall depth of the stator slot is: 0.05-0.15;

[0027] The ratio of the depth of the slot shoulder to the width of the slot body bottom is 0.2-0.4; wherein the depth is the dimension along the radial direction of the stator core.

[0028] Optionally, the ratio of the width of the bottom of the slot body to the radius of the stator chip is: 0.111-0.114.

[0029] Optionally, the width of the bottom of the slot body is 4.8 mm, and the radius of the stator chip is 42.6 mm.

[0030] Optionally, the number of the stator slots is 12.

[0031] The tooth portion includes: a pivot tooth and the pole shoe;

[0032] The coil winding is connected to the pivot tooth;

[0033] The pole shoes correspond to the pivot teeth one by one, and the pole shoes are located at the end of the pivot teeth away from the axis of the stator component. The width of the pole shoes is greater than the width of the pivot teeth; the slot body is formed between two adjacent pivot teeth, and the slot shoulder and the slot opening are formed between two adjacent pole shoes.

[0034] Optionally, the magnetic member is opposite to the tooth portion;

[0035] The inner side surface of the magnetic member facing the stator member includes: a first portion, and a second portion and a third portion respectively located on both sides of the first portion along the circumferential direction of the stator member, wherein a first air gap is formed between the first portion and the stator member, and a second air gap is formed between the second portion and the stator member, and between the third portion and the stator member, the first air gap and the second air gap constitute the gap, and the thickness of the first air gap is smaller than the thickness of the second air gap; wherein the thickness of the first air gap and the thickness of the second air gap are both the thickness along the radial direction of the stator member.

[0036] Optionally, a thickness of the second air gap gradually increases in a direction away from the first portion along the circumference of the rotor component.

[0037] Optionally, the second portion and the third portion are both inclined surfaces.

[0038] Optionally, the ratio of the thickness of the second air gap to the thickness of the first air gap is: 1.9-2.1; and / or the ratio of the length of the first air gap to the length of the inner side surface of the magnetic part is: 0.1-0.5, wherein the thickness of the first air gap and the thickness of the second air gap are both the perpendicular distances between two relative points in the radial direction.

[0039] Optionally, the first portion is adapted to the shape of the pole shoe.

[0040] Optionally, the thickness of the magnetic component along the radial direction of the rotor component is: 4.5δ-10.5δmm; wherein δ is the thickness of the first air gap.

[0041] Optionally, the number of the magnetic parts is 14.

[0042] Optionally, the rotor component has a first axial hole, the stator component has a second axial hole coaxial with the first axial hole, and the stator component is located in the first axial hole.

[0043] Optionally, the yoke.

[0044] Optionally, the motor further comprises:

[0045] a fan fixed to the first housing to transmit the mechanical energy generated by the rotor;

[0046] an output shaft, passing through the second shaft hole, the output shaft being used to output the mechanical energy transmitted by the fan;

[0047] a first bearing, the first bearing being connected to the output shaft and the fan respectively;

[0048] a second shell, the second shell being located outside the first shell;

[0049] A second bearing is connected to the second housing and the output shaft respectively.

[0050] Optionally, the second housing, the rear housing and the third bearing;

[0051] The front housing 131 includes a first side wall and a second side wall. The second side wall extends from the inner side of the first side wall toward the axis of the stator component in the radial and axial directions of the stator component and passes through the second axial hole. The first side wall defines an accommodating cavity. The second side wall divides the accommodating cavity into a front cavity and a rear cavity that are interconnected. The rear housing is connected to the first side wall.

[0052] The second bearing is located in the front cavity, and the first housing, the rotor component, the stator component and the first bearing are located in both the front cavity and the rear cavity;

[0053] The third bearing is connected to the second side wall and the output shaft respectively, and the third bearing and the second bearing are respectively located at two opposite ends of the second side wall.

[0054] A second embodiment of the present disclosure provides a cleaning device, which includes the motor described in the first embodiment.

[0055] Effects of the Invention

[0056] In the motor provided by the embodiment of the present disclosure, the uniformity of the overall magnetic circuit is ensured by limiting the values ​​of relevant parameters such as the ratio between the yoke and the pole pitch of the rotor part, the ratio between the armature size and the pole pitch, and the gap size formed in the radial direction between the stator part and the rotor part, thereby reducing the motor loss and achieving the purpose of improving the motor efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] FIG1 is a cross-sectional view perpendicular to the axial direction of the motor in some optional embodiments of the present disclosure;

[0058] FIG2a is a schematic structural diagram of the stator component in FIG1 ;

[0059] Figure 2b is an enlarged view of point A in Figure 2a;

[0060] FIG3 is a schematic structural diagram of the stator chip in FIG2a;

[0061] Figure 4a is an enlarged view of point B in Figure 3;

[0062] FIG4 b is a schematic diagram of a partial structure of a stator chip in some optional embodiments of the present disclosure;

[0063] FIG5 is a schematic diagram showing how the cogging torque pulsation of a motor varies with the width of the bottom of a stator slot in some optional embodiments of the present disclosure;

[0064] FIG6 is a schematic structural diagram of the rotor component in FIG1 ;

[0065] FIG7 is a schematic structural diagram of the rotor member in FIG6 from another perspective;

[0066] FIG8 is a schematic diagram showing the relative relationship between the magnetic member and the outer side surface of the stator pole shoe in FIG1;

[0067] FIG9 is a schematic diagram of simulation results of the motor efficiency in FIG1 ;

[0068] FIG10 is a cross-sectional view of the motor in FIG1 taken along a direction parallel to the motor axis;

[0069] FIG11 is an exploded view of the motor in FIG1 .

[0070] Description of Reference Numerals

[0071] 00, cross section of the notch;

[0072] 110, stator component; 110a, coil winding; 110b, stator core; 111, tooth portion; 111a, pole shoe; 111b, pivot tooth; 112, stator slot; 112a, slot body; 112b, slot shoulder; 112c, slot opening; 113, second axial hole; 114, opening;

[0073] 120, rotor member; 120a, yoke; 120b, magnetic member; 120c, first housing; 121, first axial hole; 122, air gap; 122a, first air gap; 122b, second air gap; 123, second portion; 124, third portion; 125, first portion;

[0074] 130, second housing; 131, front housing; 131a, first side wall; 131b, second side wall; 132, rear housing;

[0075] 140, output shaft;

[0076] 150. Fan;

[0077] 160, first bearing;

[0078] 170, third bearing;

[0079] 180. Second bearing. DETAILED DESCRIPTION

[0080] To make the technical solutions and beneficial effects of the present disclosure more clearly understood, the following detailed description is provided by way of specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly illustrate the details of the local features. Unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application belongs.

[0081] In the description of the present disclosure, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of a simplified description of the present disclosure, and do not indicate that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be understood as a limitation to the present disclosure.

[0082] In this disclosure, the terms "first" and "second" are used solely for descriptive purposes and should not be construed as indicating the relative importance of the features indicated or the quantity of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly include at least one of such features. Throughout this disclosure, "plurality" means at least two, such as two or three, and "several" means at least one, such as one, two, or three, unless otherwise specifically defined.

[0083] In this disclosure, unless otherwise expressly defined, terms such as "installed," "connected," "connect," "fixed," and "disposed" should be interpreted broadly. For example, "connection" can mean fixed, removable, or integrated; it can mean mechanical or electrical; it can mean direct or indirect connection through an intermediary; it can also mean internal communication between two components or an interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on the specific circumstances.

[0084] In the present disclosure, unless otherwise explicitly defined, a first feature being “on,” “above,” “above,” “above,” “below,” “below,” or “below” a second feature may mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact via an intermediate medium. Moreover, a first feature being “on,” “above,” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. A first feature being “below,” “below,” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0085] As shown in Figures 1 to 4a, an embodiment of the present disclosure provides a motor, which includes: a magnetic rotor component 120 and a stator component 110, wherein the stator component 110 and the rotor component 120 are coaxially distributed. Generally, the stator component 110 includes a coil winding 110a and a plurality of stacked stator cores 110b, wherein the coil winding 110a is connected to the stator cores 110b, for example, the coil winding 110a is formed by winding a coil around the stator cores 110b. The rotor component 120 includes a magnetic component 120b. When alternating current is applied to the coil winding 110a, the coil winding 110a generates a rotating magnetic field. The rotating electromagnetic field interacts with the magnetic component 120b to drive the rotor component 120 to rotate, thereby converting the electrical energy applied to the stator component 110 into mechanical energy for the rotation of the rotor component 120.

[0086] As shown in Figures 1, 6 and 7, the rotor component 120 includes a yoke 120a and multiple magnetic components 120b distributed along the circumferential direction. The multiple magnetic components 120b are connected to the yoke 120a, and the distance between the same side walls of two adjacent magnetic components 120b in the circumferential direction constitutes the pole pitch. As shown in Figures 3 and 4a, the stator component 110 includes a plurality of teeth 111. A pole shoe 111a is formed at the end of each tooth 111 facing away from the axis of the stator component 110. The ratio of the thickness of the yoke 120a in the radial direction of the rotor component 120 to the pole pitch is 0.2-0.3. The ratio of the armature size formed by the stator component 110 to the pole pitch is 0.46-0.50. This ensures that the gap formed in the radial direction between the stator component 110 and the rotor component 120 and the ratio of the circumferential facing area of ​​the pole shoe 111a and the magnetic component 120b are both within a preset range. The radial size of the gap is 0.75-0.95 mm. The radial size of the gap is calculated as follows:

[0087] Among them, k s is the magnetic saturation coefficient, constant 1.1-1.35, k σ The air gap coefficient is 122, the constant is 1.15-1.25, B σis the air gap 122 magnetic density, unit T (0.8-0.85Br), δ is the air gap 122, unit mm, h m is the radial thickness of the magnetic member (120b), μ0 is a constant of 4π*10 -7 , h c is the coercive force, unit is A / m.

[0088] In some optional embodiments, the ratio of the thickness of the yoke 120a in the radial direction of the rotor component 120 to the pole pitch can be 0.2, 0.25, or 0.3. The ratio of the armature size formed by the stator component 110 to the pole pitch can be 0.46, 0.47, 0.48, 0.49, or 0.50. The radial gap size can be 0.75, 0.78, 0.80, 0.85, 0.90, 0.92, or 0.95 mm, etc.

[0089] Parameters influencing the pole pitch include: armature size and the number of pole pairs of the permanent magnet. For example, taking the motor shown in FIG1 as an example, the minimum diameter of the rotor part 120 is 87 mm and the maximum diameter is 99 mm. The middle value is taken as the pole pitch diameter of 93 mm. The motor has a total of 14 pole pitches (or 14 pole pairs), and the arc length of a single pole pitch is (93 mm * 3.14) / 14 = 20.86 mm. The armature diameter is 42.67 mm.

[0090] The armature size refers to the armature diameter, ie, the diameter of the stator core piece 110 b .

[0091] In the embodiment of the present disclosure, through the above-mentioned motor structure and size limitations, the stator component 110 is energized to generate a magnetic field, and the magnetic field spreads toward the rotor component 120 after passing through an unobstructed gap. The present disclosure limits the spatial dimensions of two parameters: the direction of magnetic circuit propagation (radial) and the area (circumferential) of the magnetic lines of force cut by the magnetic component, which can better ensure the overall uniformity of the magnetic circuit, thereby reducing motor losses and achieving the purpose of improving motor efficiency.

[0092] As shown in Figures 2b and 4a, in the embodiment of the present disclosure, the stator component 110 has: a stator slot 112, and an opening 114 connecting the inner and outer spaces of the stator slot 112; the hollow volume gradually increases from the bottom of the stator slot 112 along the radial direction of the stator component 110 to the first position; the hollow volume gradually decreases from the second position of the stator slot 112 along the radial direction of the stator component 110 to the opening 114; wherein, the first position and the second position are both located between the bottom of the stator slot 112 and the opening 114, and the second position is located between the first position and the slot 112c.

[0093] The design of gradually increasing the hollow volume of the stator slots 112 from the bottom to the first position along the radial direction of the stator component 110 can ensure a good slot fill rate, reduce vibration and noise, and also reduce the resistance of the coil winding 110a, thereby reducing copper loss and improving motor efficiency.

[0094] Generally, the first and second positions are different locations of the stator slot 112. The second position is closer to the opening 114 than the first position. The hollow volume from the bottom of the stator slot 112 to the first position gradually increases, while the hollow volume from the second position to the opening 114 gradually decreases. This structure can guide airflow toward the opening 114, more effectively dissipating heat through the opening 114 with the airflow, thereby improving heat dissipation efficiency.

[0095] As shown in Figure 4a, according to some optional embodiments, the hollow volume of the stator slot 112 gradually decreases from a first position to a second position along the radial direction of the stator component 110. This structure can accelerate the airflow out of the stator slot 112, making the airflow velocity at the opening 114 greater than the airflow velocity within the gap, guiding the flow of fluid toward the opening 114 and improving heat dissipation efficiency.

[0096] According to some optional embodiments, as shown in Figures 3 and 4a, each stator core 110b has a plurality of teeth 111 distributed along the circumference of the stator core 110b. The plurality of teeth 111 carry the coil windings 110a, and stator slots 112 are formed between adjacent teeth 111. As shown in Figures 2a and 3, the bottoms of the plurality of teeth 111 are connected as a whole, and a second axial hole 113 is formed in the connecting portion of the bottoms of the plurality of teeth 111.

[0097] Optionally, the stator core piece 110 b may be a stator punching sheet formed by punching.

[0098] Stator slot 112 comprises a main slot body 112a, a shoulder 112b, and a slot opening 112c, all interconnected. Shoulder 112b is located between main slot body 112a and slot opening 112c. The end of slot opening 112c facing away from shoulder 112b is an opening 114. The bottom of stator slot 112 is the bottom of main slot body 112a. The first position is located at the first end of shoulder 112b, and the second position is located at the second end of shoulder 112b, with the second end being opposite the first end. The cross-section of main slot body 112a is fan-shaped, and / or the cross-section of slot opening 112c is trapezoidal. The cross-section is perpendicular to the axis of stator assembly 110.

[0099] In the disclosed embodiment, since the stator component 110 and the rotor component 120 are coaxial, the axis of the stator component 110 coincides with the axis of the rotor component 120. The circumferential direction of the stator component 110 is the same as the circumferential direction of the rotor component 120, the radial direction of the stator component 110 is the same as the radial direction of the rotor component 120, and the axial direction of the stator component 110 is also the same as the axial direction of the rotor component 120. Generally, the axis of the stator component 110 coincides with the axis of the motor.

[0100] In the fan-shaped slot body 112a, the width along the circumferential direction of the stator component 110 gradually increases from the bottom of the slot body 112a to the first position. In the trapezoidal slot opening 112c, the width along the circumferential direction of the stator component 110 gradually decreases from the second position to the opening 114. The inner walls of both the slot body 112a and the slot opening 112c are inclined.

[0101] The inner wall of the slot shoulder 112b is an inclined surface that guides the fluid flowing from the slot body 112a to the slot opening 112c. This inclined surface causes the width of the slot shoulder 112b along the circumferential direction of the stator component 110 to gradually decrease from the first position to the second position, and the cross-section of the slot shoulder 112b also forms a trapezoid.

[0102] Exemplarily, the hollow volume gradually decreases from the first position along the radial direction of the stator component 110 to the opening 114 , that is, the hollow volume gradually decreases from the first end of the slot shoulder 112 b to the opening 114 of the slot 112 c.

[0103] As shown in Figures 3 and 4a, according to some optional embodiments, the inner wall slope of the groove shoulder 112b is different from the inner wall slope of the groove opening 112c, and the angle formed by the inner wall of the groove shoulder 112b and the waistline of the groove opening 112c is 150-165°. For example, the angle formed by the inner wall of the groove shoulder 112b and the waistline of the groove opening 112c can be 150°, 153°, 155°, 158°, 160° or 165°.

[0104] 3 and 4 exemplarily show that the slope of the notch 112 c is greater than the slope of the shoulder 112 b .

[0105] Alternatively, as shown in FIG. 4 b , the slope of the inner wall of the groove shoulder 112 b may be the same as that of the inner wall of the groove opening 112 c .

[0106] As shown in Figures 1 to 4a, according to some optional embodiments, the number of stator slots 112 is 12, and the number of rotor poles (i.e., the number of magnetic elements 120b) is 14. This arrangement helps improve the slot fill rate and reduce vibration and noise. It also shortens the coil circumference of the coil winding 110a and the extension length of the coil winding 110a end, thereby reducing the resistance of the coil winding 110a of the motor and copper loss. This improves motor efficiency and reduces temperature rise, while also reducing time constant, improving speed, and increasing power density.

[0107] As shown in FIG4 a , according to some optional embodiments, the stator slot 112 meets at least one of the following conditions:

[0108] The ratio between the width M of the notch 112c and the width A of the bottom of the notch body 112a is 0.7-0.9;

[0109] The ratio between the width A of the bottom of the groove body 112a and the width B of the groove shoulder 112b at the first position is: 0.3-0.6;

[0110] The ratio between the depth C of the slot 112 c and the overall depth E of the stator slot 112 is: 0.05-0.15;

[0111] The ratio of the depth D of the slot shoulder 112 b to the width A of the slot bottom of the slot body 112 a is 0.2-0.4, wherein the depth refers to the dimension along the radial direction of the stator core piece 110 b .

[0112] The mouth width M of the slot 112 c is the width of the opening 114 of the slot 112 c.

[0113] For example, the ratio of the width M of the slot opening 112c to the width A of the slot bottom of the slot body 112a is approximately 0.7, 0.8, or 0.9. The ratio of the width A of the slot bottom of the slot body 112a to the width B of the slot shoulder 112b at the first position is approximately 0.3, 0.4, 0.5, or 0.6. The ratio of the depth C of the slot opening 112c to the overall depth E of the stator slot 112 is approximately 0.05, 0.07, 0.08, 0.09, 0.10, 0.12, 0.13, or 0.15. The ratio of the depth D of the slot shoulder 112b to the width A of the slot bottom of the slot body 112a is approximately 0.2, 0.3, or 0.4.

[0114] According to some optional embodiments, the ratio of the width A of the bottom of the slot body 112a to the radius N of the stator core 110b is 0.111-0.114. For example, the ratio of the width A of the bottom of the slot body 112a to the radius N of the stator core 110b is approximately 0.111, 0.112, 0.113, or 0.114.

[0115] As shown in FIG. 2 a , the radius N of the stator core piece 110 b is also the overall radius of the stator component 110 , also known as the armature radius.

[0116] In one embodiment, the motor structure is that shown in Figures 1 to 4a , and the stator slot 112 satisfies the following requirements: the ratio of the slot opening 112c width M to the slot body 112a bottom width A is 0.7-0.9; the ratio of the slot body 112a bottom width A to the slot shoulder 112b width B at the first position is 0.3-0.6; the ratio of the slot opening 112c depth C to the overall depth E of the stator slot 112 is 0.05-0.15; and the ratio of the slot shoulder 112b depth D to the slot body 112a bottom width A is 0.2-0.4. Furthermore, the ratio of the slot body 112a bottom width A to the stator core 110b radius N is 0.111-0.114. The slot body 112a bottom width A is 4.8 mm, and the stator core 110b radius N is 42.6 mm. As shown in Figure 5, the horizontal axis in Figure 5 represents the width A of the bottom of the slot body 112a. Different cogging torque pulsations result from different widths. Setting the width A of the bottom of the slot body 112a to 4.8 mm can achieve lower cogging torque pulsations. In summary, this motor setting optimizes the cogging torque, reduces motor losses, and improves motor efficiency. Moreover, the motor of the disclosed embodiment has an axial air outlet mode, and the structure of the stator slot 112, combined with the above-mentioned size ratio, can effectively dissipate heat during the heat dissipation process.

[0117] As shown in Figures 3 and 4a, according to some optional embodiments, the tooth portion 111 includes: a pivot tooth 111b and a pole shoe 111a, with the coil winding 110a connected to the pivot tooth; the pole shoe 111a corresponds one-to-one with the pivot tooth 111b, and the pole shoe 111a is located at the end of the pivot tooth facing away from the axis of the stator component 110, and the width of the pole shoe 111a is greater than the width of the pivot tooth 111b; a slot body 111b is formed between two adjacent pivot teeth 111b, and a slot shoulder 112b and a slot opening 112c are formed between two adjacent pole shoes 111a. In other words, the tooth portion 111 can be divided into two parts: the pivot tooth 111b and the pole shoe 111a, wherein the pivot teeth 111b of two adjacent tooth portions 111 form the slot body 112a, and the pole shoes 111a of two adjacent tooth portions 111 form the slot shoulder 112b and the slot opening 112c.

[0118] According to some optional embodiments, the magnetic member 120b is opposite to the teeth 111. As shown in Figures 6 and 7, a plurality of magnetic members 120b are located on the inner side of the yoke 120a toward the axis of the rotor member 120 and are evenly distributed in the circumferential direction.

[0119] As shown in Figure 8, the inner side surface of the magnetic part 120b is opposite to the pole shoe 111a of the tooth portion 111, and the outer side surface of the magnetic part 120b is connected to the yoke portion 120a, wherein the inner side surface and the outer side surface of the magnetic part 120b are two opposite surfaces, and there is an air gap 122 between the inner side surface of the magnetic part 120b and the pole shoe 111a of the tooth portion 111.

[0120] As shown in FIG8 , the inner side of the magnetic member 120b facing the stator member 110 includes a first portion 125, and a second portion 123 and a third portion 124, respectively located on either side of the first portion 125 along the circumferential direction of the stator member 110. A first air gap 122a is formed between the first portion 125 and the stator member 110, and a second air gap 122b is formed between the second portion 123 and the stator member 110, and between the third portion 124 and the stator member 110. The first air gap 122a and the second air gap 122b constitute the aforementioned gaps. The thickness δ of the first air gap 122a is less than the thickness L3 of the second air gap 122b. The thickness δ of the first air gap 122a and the thickness L3 of the second air gap 122b are both thicknesses along the radial direction of the stator member 110. Specifically, the thickness of the first air gap 122a and the thickness of the second air gap 122b are both the perpendicular distances between two opposing points in the radial direction.

[0121] Generally, the size of the second air gap 122b between the second portion 123 and the stator component 110 is equal to the size of the second air gap 122b between the third portion 124 and the stator component 110. The size herein includes, but is not limited to, at least one of the following: the thickness of the air gap 122, the length of the air gap 122, or the volume of the air gap 122. The length of the air gap 122 refers to the length along the circumferential direction of the stator component 110.

[0122] Compared with the conventional uniform air gap 122, the embodiment of the present disclosure optimizes the air gap 122 between the rotor component 120 and the stator component 110 to be an uneven air gap 122, that is, the thickness of the air gap 122 corresponding to the middle part of the magnetic component 120b is smaller, while the thickness of the air gap 122 corresponding to the two sides of the magnetic component 120b is larger. This setting can make the magnetic density distribution of the air gap 122 generated by the magnetic component 120b close to a sine wave, which is beneficial to reducing the magnetic slot torque and torque ripple under load.

[0123] As shown in FIG8 , according to some optional embodiments, the thickness L3 of the second air gap 122b gradually increases along the circumference of the rotor component 120 in a direction away from the first portion 125. This non-uniform air gap 122 structure can further make the magnetic flux density distribution of the air gap 122 generated by the magnetic component 120b closer to a sine wave, which is more conducive to reducing cogging torque and torque ripple under load.

[0124] Illustratively, the magnetic member 120b in the embodiment of the present disclosure is a permanent magnet.

[0125] As shown in FIG. 8 , according to some optional embodiments, the second portion 123 and the third portion 124 are both inclined surfaces.

[0126] As shown in FIG8 , according to some optional embodiments, the ratio of the thickness L3 of the second air gap 122b to the thickness δ of the first air gap 122a is 1.9-2.1; and / or the ratio of the length L2 of the first air gap 122a to the length L1 of the inner side surface of the magnetic member 120b is 0.1-0.5. In FIG8 , α is the length of the surface of the pole piece facing the magnetic member 120b.

[0127] For example, the ratio between the thickness L3 of the second air gap 122 b and the thickness δ of the first air gap 122 a is 1.9, 2.0 or 2.1.

[0128] For another example, the ratio of the length L2 of the first air gap 122 a to the length L1 of the inner side surface of the magnetic component 120 b is 0.1, 0.2, 0.3, 0.4 or 0.5.

[0129] As shown in Figure 8, according to some optional embodiments, the first portion 125 is adapted to the shape of the pole shoe 111a. For example, the shape of the first portion 125 is the same as the shape of the top surface of the pole shoe 111a adjacent to the magnetic member 120b.

[0130] By improving the size and shape of the second air gap 122b and the first air gap 122a, the motor pole arc can be optimized, the cogging torque can be further reduced, and the motor performance can be improved.

[0131] Compared to the conventional uniform air gap 122 , the cogging torque of the motor according to the embodiment of the present disclosure can be reduced by about 50%.

[0132] According to some optional embodiments, the thickness of the magnetic component 120 b along the radial direction of the rotor component 120 is 4.5δ-10.5δ mm, where δ is the thickness of the first air gap 122 a .

[0133] According to some alternative embodiments, the rotor component 120 has a first axial hole 121, and the stator component 110 has a second axial hole 113 coaxial with the first axial hole 121. The stator component 110 is located within the first axial hole 121, i.e., the motor is an outer rotor motor. Compared to inner rotor motors, outer rotor motors are smaller. Furthermore, the motor in the disclosed embodiment is a brushless outer rotor motor.

[0134] As shown in Figure 9, based on the above design, electromagnetic simulation calculations are performed to draw a motor efficiency MAP diagram (in Figure 9, the horizontal axis usually represents the motor speed and the vertical axis represents the motor load). Figure 9 shows the efficiency performance of the motor at different speeds and loads. It can be seen from Figure 9 that the maximum efficiency of the motor exceeds 85%.

[0135] As shown in FIG. 10 and FIG. 11 , according to some optional embodiments, the yoke 120 a is a first housing 120 c of the motor.

[0136] The magnetic member 120 b is fixed to the first housing 120 c , so that the first housing 120 c not only plays a protective role but also serves as the structure of the rotor yoke 120 a .

[0137] As shown in Figures 10 and 11, according to some optional embodiments, the motor also includes: a fan 150, an output shaft 140, a first bearing 160, a second shell 130 and a second bearing 180, the fan 150 is fixed to the first shell 120c to transmit the mechanical energy generated by the rotor; the output shaft 140 is passed through the second shaft hole 113, and the output shaft 140 is used to output the mechanical energy transmitted by the fan 150; the first bearing 160 is respectively connected to the output shaft 140 and the fan 150; the second shell 130 is located outside the first shell 120c; the second bearing 180 is respectively connected to the second shell 130 and the output shaft 140.

[0138] When the rotor rotates, the rotating first shell 120c drives the fan 150 to rotate, and the rotating fan 150 can drive the output shaft 140 to rotate through the first bearing 160, that is, the magnetic member 120b, the first shell 120c, the fan 150 and the output shaft 140 rotate synchronously.

[0139] According to some optional embodiments, the second housing 130 includes: a front housing 131, a rear housing 132 and a third bearing 170; the front housing 131 includes: a first side wall 131a and a second side wall 131b, the second side wall 131b extends from the inner side of the first side wall 131a to the axial direction of the stator component 110 along the radial and axial directions of the stator component 110, and is penetrated by the second shaft hole 113, the first side wall 131a defines a receiving cavity, and the second side wall 131b divides the receiving cavity into The front cavity and the rear cavity are interconnected, and the rear shell 132 is connected to the first side wall 131a; the second bearing 180 is located in the front cavity, the first shell 120c, the rotor component 120, the stator component 110 and the first bearing 160 are located in the rear cavity, and the output shaft 140 is located in both the front cavity and the rear cavity; the third bearing 170 is respectively connected to the second side wall 131b and the output shaft 140, and the third bearing 170 and the second bearing 180 are respectively located at opposite ends of the second side wall 131b.

[0140] The front shell 131 and the rear shell 132 are distributed in two opposite directions to cover at least the stator component 110 and the rotor component 120 to provide protection.

[0141] The second side wall 131b of the front shell 131 has a certain limiting effect on the output shaft 140, which can improve the stability of the output power of the output shaft 140. Moreover, the second side wall 131b of the front shell 131 can be used to fix the front shell 131 in two directions of the output shaft 140, which is beneficial to improving the reliability of the connection between the front shell 131 and the output shaft 140.

[0142] An embodiment of the present disclosure further provides a cleaning device, which includes the motor described in the above embodiment.

[0143] Cleaning equipment includes but is not limited to: floor scrubbers, vacuum cleaners, window cleaners, self-propelled cleaning equipment, etc.

[0144] It should be understood that the above embodiments are exemplary and are not intended to include all possible implementations included in the claims. Various modifications and changes can be made to the above embodiments without departing from the scope of the present disclosure. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of the present disclosure that may not be explicitly described. Therefore, the above embodiments only express several implementations of the present disclosure and do not limit the scope of protection of the patent of the present disclosure.

Claims

1. A motor, comprising a stator component (110) and a magnetic rotor component (120), wherein the stator component (110) and the rotor component (120) are coaxially distributed, and when energized, the stator component (110) has a magnetic field capable of driving the rotor component (120) to rotate, so as to realize conversion of electrical energy of the stator component (110) into mechanical energy for the rotation of the rotor component (120), characterized in that: The motor comprises: The rotor component (120) comprises a yoke (120a), a plurality of magnetic components (120b) distributed along the circumferential direction, the plurality of magnetic components (120b) are connected to the yoke (120a), and the distance between the same-side side walls of two adjacent magnetic components (120b) in the circumferential direction constitutes a pole pitch; The stator component (110) comprises a plurality of teeth (111), and a pole shoe (111a) is formed at the end of each of the teeth (111) away from the axis of the stator component (110). The ratio between the thickness of the yoke (120a) in the radial direction of the rotor component (120) and the pole pitch is 0.2-0.3, and the ratio between the size of the armature formed by the stator component (110) and the pole pitch is 0.46-0.50, so that the gap formed in the radial direction between the stator component (110) and the rotor component (120) and the ratio of the facing area of ​​the pole shoe (111a) and the magnetic component (120b) in the circumferential direction are both within a preset range, and the size of the gap in the radial direction is 0.75-0.95 mm; The calculation formula of the radial dimension of the gap is: Among them, k s is the magnetic saturation coefficient, constant 1.1-1.35, k σ The air gap coefficient is 122, the constant is 1.15-1.25, B σ is the air gap 122 magnetic density, unit T (0.8-0.85Br), δ is the air gap 122, unit mm, h m is the radial thickness of the magnetic member (120b), μ0 constant 4π*10 -7 ,h c It is the coercive force, unit is A / m.

2. The motor according to claim 1, characterized in that The stator component (110) comprises: a stator slot (112), and an opening (114) communicating with the inner and outer spaces of the stator slot (112); The hollow volume gradually increases from the bottom of the stator slot (112) along the radial direction of the stator component (110) to the first position; and the hollow volume gradually decreases from the second position of the stator slot (112) along the radial direction of the stator component (110) to the opening (114); wherein the first position and the second position are both located between the bottom of the stator slot (112) and the opening (114), and the second position is located between the first position and the opening (114).

3. The motor according to claim 2, characterized in that The hollow volume gradually decreases from a first position of the stator slot (112) toward the second position along the radial direction of the stator component (110), so as to increase the speed of the airflow flowing out of the stator slot (112), so that the airflow velocity at the opening (114) is greater than the airflow velocity in the gap.

4. The motor according to claim 3, characterized in that The stator component (110) comprises: Coil winding (110a); A plurality of stacked stator core sheets (110b), each of the stator core sheets (110b) having a plurality of teeth (111), the plurality of teeth (111) being distributed along the circumference of the stator core sheet (110b), the plurality of teeth (111) carrying the coil winding (110a), and a stator slot (112) being formed between two adjacent teeth (111); The stator slot (112) comprises: a slot body (112a), a slot shoulder (112b) and a slot opening (112c) which are interconnected, the slot shoulder (112b) being located between the slot body (112a) and the slot opening (112c), the end of the slot opening (112c) away from the slot shoulder (112b) being the opening (114), the bottom of the stator slot (112) being the slot bottom of the slot body (112a), the first position being located at a first end of the slot shoulder (112b), the second position being located at a second end of the slot shoulder (112b), wherein the second end is an end opposite to the first end; The cross section of the slot body (112a) is fan-shaped, and / or the cross section of the slot opening (112c) is trapezoidal; wherein the cross section is a cross section perpendicular to the axis of the stator component (110).

5. The motor according to claim 4, characterized in that The inner wall of the groove shoulder (112b) is an inclined surface that guides the fluid flowing from the groove body (112a) to the groove opening (112c).

6. The motor according to claim 5, characterized in that The inner wall slope of the groove shoulder (112b) is different from the inner wall slope of the groove opening (112c), and the angle formed by the inner wall of the groove shoulder (112b) and the waistline of the groove opening (112c) is 150-165°.

7. The motor according to any one of claims 4 to 6, characterized in that: The stator slot (112) meets at least one of the following conditions: The ratio between the width of the opening of the slot (112c) and the width of the bottom of the slot body (112a) is 0.7-0.9; The ratio between the width of the bottom of the groove body (112a) and the width of the groove shoulder (112b) at the first position is: 0.3-0.6: The ratio between the depth of the notch (112c) and the overall depth of the stator slot (112) is: 0.05-0.15; The ratio between the depth of the slot shoulder (112b) and the width of the slot bottom of the slot body (112a) is 0.2-0.4; wherein the depth is the dimension along the radial direction of the stator core piece (110b).

8. The motor according to claim 4, characterized in that The ratio between the width of the bottom of the slot body (112a) and the radius of the stator core (110b) is 0.111-0.

114.

9. The motor according to claim 4, characterized in that The width of the bottom of the slot body (112a) is 4.8 mm, and the radius of the stator core piece (110b) is 42.6 mm.

10. The motor according to claim 2, characterized in that The number of the stator slots (112) is 12.

11. The motor according to claim 4, characterized in that The tooth portion (111) includes: a pivot tooth (111b) and a pole shoe (111a) The coil winding (110a) is connected to the pivot tooth (111b); The pole shoe (111a) corresponds to the pivot tooth (111b) one by one. The pole shoe (111a) is located at the end of the pivot tooth (111b) away from the axis of the stator component (110). The width of the pole shoe (111a) is greater than the width of the pivot tooth (111b). The slot body (112a) is formed between two adjacent pivot teeth (111b), and the slot shoulder (112b) and the slot opening (112c) are formed between two adjacent pole shoes (111a).

12. The motor according to claim 1 or 2 or 3 or 4 or 5 or 6 or 8 or 9 or 10 or 11, characterized in that: The magnetic member (120b) is opposite to the tooth portion (111); The inner side surface of the magnetic member (120b) facing the stator member (110) comprises: a first portion (125), and a second portion (123) and a third portion (124) respectively located on both sides of the first portion (125) along the circumferential direction of the stator member (110), wherein a first air gap (122a) is formed between the first portion (125) and the stator member (110), and a second air gap (122b) is formed between the second portion (123) and the stator member (110), and between the third portion (124) and the stator member (110), the first air gap (122a) and the second air gap (122b) constitute the gap, and the thickness of the first air gap (122a) is smaller than the thickness of the second air gap (122b); wherein the thickness of the first air gap (122a) and the thickness of the second air gap (122b) are both thicknesses along the radial direction of the stator member (110).

13. The motor according to claim 12, characterized in that The thickness of the second air gap (122b) gradually increases along the circumferential direction of the rotor component (120) in a direction away from the first portion (125).

14. The motor according to claim 13, characterized in that The second portion (123) and the third portion (124) are both inclined surfaces.

15. The motor according to claim 14, characterized in that The ratio between the thickness of the second air gap (122b) and the thickness of the first air gap (122a) is: 1.9-2.1; and / or the ratio between the length of the first air gap (122a) and the length of the inner side surface of the magnetic member (120b) is: 0.1-0.5, wherein the thickness of the first air gap (122a) and the thickness of the second air gap (122b) are both perpendicular distances between two relative points in the radial direction.

16. The motor according to claim 12, characterized in that The first portion (125) is adapted to the shape of the pole shoe (111a).

17. The motor according to claim 12, characterized in that The thickness of the magnetic component (120b) along the radial direction of the rotor component (120) is: 4.5δ-10.5δmm; wherein δ is the thickness of the first air gap (122a).

18. The motor according to claim 12, characterized in that The number of the magnetic members (120b) is 14.

19. The motor according to claim 12, characterized in that The rotor component (120) has a first axial hole (121), the stator component (110) has a second axial hole (113) coaxial with the first axial hole (121), and the stator component (110) is located in the first axial hole (121).

20. The electric machine according to claim 19, characterized in that The yoke (120a) is a first housing (120c) of the motor.

21. The electric machine according to claim 20, characterized in that The motor also includes: a fan (150), the fan (150) being fixed to the first housing (120c) to transmit the mechanical energy generated by the rotor; an output shaft (140) passing through the second shaft hole (113), the output shaft (140) being used to output the mechanical energy transmitted by the fan (150); A first bearing (160), the first bearing (160) being connected to the output shaft (140) and the fan (150) respectively; A second shell (130), wherein the second shell (130) is located outside the first shell (120c); A second bearing (180), wherein the second bearing (180) is connected to the second housing (130) and the output shaft (140) respectively.

22. The electric machine according to claim 21, characterized in that The second housing (130) comprises: a front housing (131), a rear housing (132) and a third bearing (170); The front shell 131 comprises: a first side wall (131a) and a second side wall (131b), wherein the second side wall (131b) extends from the inner side of the first side wall (131a) toward the axial direction of the stator component (110) in the radial direction and the axial direction of the stator component (110), and is penetrated through the second axial hole (113), the first side wall (131a) defines a receiving cavity, and the second side wall (131b) divides the receiving cavity into a front cavity and a rear cavity which are interconnected, and the rear shell (132) is connected to the first side wall (131a); The second bearing (180) is located in the front cavity, the first housing (120c), the rotor component (120), the stator component (110) and the first bearing (160) are located in the rear cavity, and the output shaft (140) is located in both the front cavity and the rear cavity; The third bearing (170) is respectively connected to the second side wall (131b) and the output shaft (140), and the third bearing (170) and the second bearing (180) are respectively located at opposite ends of the second side wall (131b).

23. A cleaning device, characterized in that: The cleaning device comprises the motor according to any one of claims 1 to 22.

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