CN217741398U - Stator punching sheet, stator core, brushless motor, fan and floor washing machine - Google Patents

Abstract

The utility model discloses a stator punching sheet, stator core, brushless motor, fan and scrubber, the stator punching sheet includes stator yoke portion and a plurality of stator tooth portion, and a plurality of the stator tooth portion is in the inboard circumference interval distribution of stator yoke portion, and the stator tooth portion is along the radial inward extension of stator yoke portion, and the inner top of each stator tooth portion is formed with the stator pole shoe, and the internal surface structure of the stator pole shoe that at least one stator tooth portion in a plurality of stator tooth portions corresponds is the gradual change face; wherein a distance between the gradient surface and a central axis of the stator yoke is configured to gradually increase or decrease from one end to the other end of the stator pole piece in a circumferential direction of the stator yoke. The utility model discloses a brushless motor, whole weight reduces, and motor work efficiency and power density obtain promoting to do benefit to the energy-conserving effect that promotes entire system.

Description

Stator punching sheet, stator core, brushless motor, fan and floor washing machine

Technical Field

The utility model belongs to the technical field of the motor technique and specifically relates to a stator is towards piece, stator core, brushless motor, have this brushless motor's fan and have the floor cleaning machine of this fan.

Background

Due to the operational characteristics and volume limitations of the scrubber, the key components of the scrubber, such as the brushless dc motor, are required to have the characteristics of high power density, high rotational speed, high efficiency, low cost, etc. In the related art, the weight of the dc brushless motor is relatively high, the efficiency is low, the demand of the user for the product cannot be met, and there is room for improvement.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the utility model is to provide a stator punching, when this stator punching is applied to stator core, can promote motor efficiency in limited space, have higher price/performance ratio.

According to the utility model discloses stator punching, include: the stator punching sheet comprises a stator yoke portion and a plurality of stator tooth portions, the stator tooth portions are distributed at intervals in the circumferential direction of the inner side of the stator yoke portion and extend inwards in the radial direction of the stator yoke portion, a stator pole shoe is formed at the top of the inner end of each stator tooth portion, and the inner surface of the stator pole shoe corresponding to at least one stator tooth portion in the stator tooth portions is constructed into a gradual change surface; wherein a distance between the gradual change surface and a central axis of the stator yoke is configured to gradually increase or decrease from one end to the other end of the stator pole shoe in a circumferential direction of the stator yoke.

According to the utility model discloses stator punching sheet, through the optimization to the inner structure of the stator tooth portion of stator punching sheet for form inhomogeneous clearance between stator core and the rotor, thereby do benefit to the air gap magnetic conductance harmonic that changes brushless motor, thereby make brushless motor's iron loss and eddy current loss obtain showing and reduce, thereby motor weight reduces, realizes that motor work efficiency and power density obtain promoting, thereby promotes entire system's energy-conserving effect.

According to the utility model discloses the stator is towards piece, the gradual change face includes multistage substructure face, substructure face structure is circular arc face and/or sharp profile.

According to the utility model discloses stator punching, multistage one in the substructure face is the main structure curved surface, just the main structure curved surface with distance between the central axis of rotor is following the circumference of gradual change face is the same.

According to the utility model discloses the stator towards the piece, the excircle size of stator towards the piece is 24mm ~ 36mm.

According to the utility model discloses the stator is towards piece, the gradual change face arrives the minimum distance of the central axis of stator yoke portion is d1, satisfies: d1 is more than or equal to 0.3mm and less than or equal to 1mm.

According to the utility model discloses some embodiments's stator punching, stator yoke's periphery wall structure is for having the multistage spline line, the multistage at least one section in the spline line is the straightway and/or at least one section is the circular arc section.

According to the stator punching sheet of some embodiments of the present invention, the number of the straight line segments is the same as that of the stator teeth, and the plurality of straight line segments correspond to the plurality of stator teeth one to one; the straight line sections and the corresponding stator tooth parts are distributed in a manner of being opposite to each other in the radial direction of the stator yoke part.

According to the utility model discloses the stator is towards piece, the gradual change face is equipped with supplementary groove, supplementary groove is in the gradual change face is followed the radial sunken formation of stator yoke portion.

According to the utility model discloses the stator is towards piece, the central point in auxiliary groove puts and corresponds the radial line in middle part of stator tooth portion staggers, just the central point in auxiliary groove puts and is located the radial line in middle part of stator tooth portion is followed between rotor direction of rotation's the reverse rotation 0 ~ 25.

According to the utility model discloses stator punching sheet of some embodiments, the circumference size of gradual change face with the ratio scope of the peripheral dimension of stator yoke portion is 0.24 ~ 0.4.

The utility model also provides a stator core.

According to the utility model discloses stator core, including a plurality of above-mentioned any kind of embodiments the stator towards the piece, it is a plurality of the stator is towards the piece and is piled up in proper order.

According to the utility model discloses some embodiments's stator core, every the both sides of the radial outer end of stator tooth portion are formed with a yoke portion section respectively, and are a plurality of the yoke portion section of stator tooth portion is in stator punching's circumference links to each other in proper order in order to form stator yoke portion.

The utility model also provides a brushless motor. According to the utility model discloses some embodiments's brushless motor, including rotor and foretell stator core, the stator core cover is located outside the rotor, just the gradual change face with be formed with inhomogeneous clearance between the periphery wall of rotor.

The utility model discloses a fan has been proposed again.

According to the utility model discloses fan is provided with any kind of above-mentioned embodiment brushless motor.

And the utility model discloses a floor cleaning machine has been proposed again.

According to the utility model discloses floor cleaning machine is provided with above-mentioned embodiment the fan.

Compared with the prior art, the stator core, the brushless motor, the fan, the floor washing machine and the stator punching sheet have the same advantages, and the description is omitted.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural view of a stator core according to some embodiments of the present invention;

fig. 2 is a schematic structural diagram of a brushless motor according to some embodiments of the present invention;

fig. 3 is a schematic structural view of a brushless motor according to further embodiments of the present invention;

fig. 4 is a schematic structural view of a stator lamination according to further embodiments of the present invention;

fig. 5 is a graph showing changes in motor efficiency before and after setting an uneven gap in a brushless motor according to the present invention;

FIG. 6 is a plot of motor efficiency versus width of an uneven gap for a brushless motor according to the present invention;

fig. 7 is a graph of the position of the auxiliary slot of the brushless motor according to the present invention with respect to the motor efficiency.

Reference numerals:

the brushless motor (100) is provided with a motor,

the stator comprises a stator core 1, stator laminations 11, a stator yoke part 111, straight line segments 112, circular arc segments 113, stator teeth 114, stator pole shoes 115, a gradual change surface 116, auxiliary slots 117, a middle radial line 118, windings 12,

rotor 2, magnetic ring 21, pivot 22, protective sheath 23.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

The following describes the stator lamination 11, the stator core 1, and the brushless motor 100 having the stator core 1 according to the embodiment of the present invention with reference to fig. 1-7, wherein the contour structure of the stator lamination 11 is optimized to form an uneven gap between the stator pole shoe 115 and the outer peripheral wall of the rotor 2, thereby changing the air gap magnetic conduction harmonic of the brushless motor 100, reducing the electromagnetic loss of the brushless motor 100, and making the brushless motor 100 realize higher working efficiency at high rotation speed, and satisfying the user's requirement.

As shown in fig. 2 to 3, a brushless motor 100 according to an embodiment of the present invention includes: a stator core 1 and a rotor 2, wherein the rotor 2 is installed in the stator core 1, as shown in fig. 2 and 3, a hollow installation region is formed at a central position of the stator core 1, and the rotor 2 is located in the installation region, wherein the stator core 1 is formed by stacking a plurality of stator laminations 11, as shown in fig. 1-4, the stator laminations 11 include a stator yoke portion 111 and a plurality of stator teeth 114, that is, the number of the stator teeth 114 is multiple, such as at least three, that is, specifically, three, six and more stator teeth can be set. As shown in fig. 1, the stator yoke 111 is configured in an annular shape, the stator teeth 114 are distributed at intervals in the circumferential direction inside the stator yoke 111, and each stator tooth 114 extends inward in the radial direction of the stator yoke 111. In other words, the radially outer ends of the stator teeth 114 are connected to the inner peripheral edge of the stator yoke 111, and the radially inner ends of the stator teeth 114 are extended toward the central axis of the stator yoke 111. It should be noted that the brushless motor 100 further includes a winding 12, the winding 12 includes a plurality of coils, and each coil is wound on a single tooth of the stator lamination 11, so as to reduce a winding end portion, which is beneficial to reducing copper loss, and is beneficial to using modular production, thereby improving production and manufacturing efficiency. The stator core 1 of the brushless motor 100 is formed by the stator lamination 11 and the winding 12.

The top of the inner end of each stator tooth 114 is formed with a stator pole piece 115, i.e., the stator pole piece 115 is disposed adjacent to the central axis of the stator yoke 111 at the inner end of the stator tooth 114. As shown in fig. 1 to 4, the number of the stator teeth 114 is three, the three stator teeth 114 are provided with stator pole shoes 115, and the stator pole shoe 115 corresponding to each stator tooth 114 is formed with a tapered surface 116, wherein the tapered surface 116 may be a circular arc surface, a linear surface, or a combined surface. The rotor 2 is mounted in the stator core 1, e.g. the rotor 2 is located between the stator pole shoes 115 of the plurality of stator teeth 114, i.e. the plurality of stator pole shoes 115 are distributed around the rotor 2. Thereby, the plurality of stator pole pieces 115 are respectively opposed to the outer peripheral wall of the rotor 2 at different positions in the circumferential direction.

Wherein a distance between the gradually-changing surface 116 and the central axis of the stator yoke 111 is configured to gradually increase or decrease from one end to the other end of the stator pole piece 115 in the circumferential direction of the stator yoke 111, whereby the distance between the gradually-changing surface 116 and the central axis of the rotor 2 in a projection in the axial direction of the stator yoke 111 after the rotor 2 is mounted with the stator core 1 and the winding 12 is not equal at least two positions in the circumferential direction of the gradually-changing surface 116, wherein the radial dimension of the outer circumferential wall of the rotor 2 is uniform, that is, the distance between the gradually-changing surface 116 and the outer circumferential wall of the rotor 2 is different at least two positions in the circumferential direction, whereby an uneven gap can be formed between the gradually-changing surface 116 and the outer circumferential wall of the rotor 2. In the specific design, the inner end surface of the stator pole shoe 115 can be thinned to form a gradual change surface 116, which is not only beneficial to forming an uneven gap, but also beneficial to realizing the lightweight arrangement of the stator punching sheet 11, and reducing the weight of the brushless motor 100.

From this, through the optimization to the inner structure of stator tooth 114 of stator punching 11 for form inhomogeneous clearance between stator core 1 and the rotor 2, thereby do benefit to the air gap magnetic conductance harmonic that changes brushless motor 100, thereby make brushless motor 100's iron loss and eddy current loss obtain showing and reducing, thereby motor weight reduces, realizes that motor work efficiency and power density obtain promoting, thereby promotes entire system's energy-conserving effect.

Wherein the distance between the gradually changing surface 116 and the central axis of the rotor 2 is gradually increased or gradually decreased in the circumferential direction along the gradually changing surface 116. That is, the distance between the gradual change surface 116 and the central axis of the rotor 2 may be gradually increased in the circumferential direction along the gradual change surface 116, and the distance between the gradual change surface 116 and the central axis of the rotor 2 may also be gradually decreased in the circumferential direction along the gradual change surface 116, so that an uneven gap may be formed between the stator pole shoe 115 and the rotor 2, so as to improve and change the air gap magnetic conductance harmonic of the brushless motor 100, and improve the motor efficiency of the brushless motor 100.

As shown in fig. 2, in the clockwise direction of the stator lamination 11 in the circumferential direction, the gradual change surface 116 is a smooth curved surface, and the distance between the gradual change surface 116 of the stator pole piece 115 and the outer circumferential wall of the rotor 2 is gradually increased, so that an uneven gap with a gradually increased width in the clockwise direction of the rotor 2 is formed.

In some embodiments, the gradual change face 116 includes multiple segments of substructure faces that are connected in series in a circumferential direction along the stator yoke 111, thereby forming the complete gradual change face 116. In which the substructure surfaces are configured as circular arc surfaces and/or straight profiles, that is, some of the plurality of substructure surfaces may be configured as circular arc surfaces and some may be configured as straight profiles, for example, in the actual design, the substructure surfaces may be set to three segments, where two segments of the substructure surfaces may be configured as circular arc surfaces and the other segment of the substructure surfaces may be configured as straight profiles, so that after the rotor 2 is installed in the stator core 1, an uneven gap may be formed.

That is to say, the utility model provides a gradual change face 116 concrete structure sets up comparatively in a flexible way, can set for according to specific design demand for form between rotor 2 and the stator pole shoe 115 inhomogeneous clearance can, it is less to the injecture of actual processing.

In some embodiments, one of the multiple sub-structure surfaces is a main structure curved surface, and the distance between the main structure curved surface and the central axis of the rotor 2 is the same in the circumferential direction along the gradual change surface 116, that is, the main structure curved surface is a smooth arc surface, and the central axis of the main structure curved surface coincides with the central axis of the rotor 2, so that after the rotor 2 is installed on the stator core 1, the distances between the main structure curved surface and the outer circumferential wall of the rotor 2 at each position in the circumferential direction are the same, and thus the gaps at this portion are relatively uniform. Therefore, the curved surface of the main structure is simple to process, smooth and flat.

In some embodiments, the minimum distance from the gradual change surface 116 to the central axis of the stator yoke 111 is d1, i.e. the width of the uneven gap between the stator core 1 and the rotor 2 is d1, and satisfies: d1 is more than or equal to 0.3mm and less than or equal to 1mm. For example, d1 may be set to 0.4mm, or d1 may be set to 0.7mm, or d1 may be set to 0.9mm. As shown in fig. 6, when the uneven gap is set within the above range, the actual efficiency of the brushless motor 100 can reach a high value, and particularly when d1 is set within 0.6mm to 0.8mm, the motor efficiency can reach more than 91.00%, so that the setting of the uneven gap within the range is beneficial to improving the operating power of the brushless motor 100.

In some embodiments, the outer peripheral wall of the stator yoke 111 is configured to have a plurality of spline lines, at least one of which is a straight line segment 112 and/or at least one of which is a circular arc segment 113. It should be noted that the outer peripheral wall of the conventional stator yoke portion 111 is a complete circle, that is, the stator yoke portion 111 has a smooth curved surface and no edge feeling.

And the utility model discloses in, especially set up at least one among them into straightway 112 through setting up multistage sample line, can do the processing shaping of cutting edge for the periphery wall from stator yoke portion 111, so set up, not only do benefit to the overall structure size that reduces stator yoke portion 111, reduce brushless motor 100's whole weight, and do benefit to and improve motor power density.

In the actual design, the design number of the straight line segments 112 may be flexibly set according to the actual design requirement, for example, the number of the straight line segments 112 is greater than the number of the circular arc segments 113, or the number of the straight line segments 112 is less than the number of the circular arc segments 113, or the number of the straight line segments 112 is the same as the number of the circular arc segments 113, and as shown in fig. 1 to 4, the number of the straight line segments 112 and the number of the circular arc segments 113 are both set to three, and the three straight line segments 112 and the three circular arc segments 113 are distributed in a staggered manner in the circumferential direction of the stator yoke 111.

In some embodiments, the number of the straight segments 112 is the same as the number of the stator teeth 114, and the plurality of straight segments 112 corresponds to the plurality of stator teeth 114 one by one, that is, the number and positions of the straight segments 112 may be set correspondingly, for example, three straight segments 112 and three circular segments 113 are distributed in a staggered manner in the circumferential direction of the stator yoke portion 111, and the three straight segments 112 correspond to the three stator teeth 114 one by one.

Particularly in practical design, each straight line segment 112 and the corresponding stator tooth 114 are directly opposite to each other in the radial direction of the stator yoke portion 111, that is, three stator tooth 114 are uniformly spaced apart in the circumferential direction of the stator yoke portion 111, and three straight line segments 112 are also uniformly spaced apart in the circumferential direction of the stator yoke portion 111, that is, the included angle between the center points of two adjacent straight line segments 112 is 120 °.

In some embodiments, the gradually changing surface 116 is provided with an auxiliary groove 117, and the auxiliary groove 117 is formed at the gradually changing surface 116 in a radial direction of the stator yoke 111. As shown in fig. 3, the tapered surface 116 of each stator tooth 114 is provided with an auxiliary groove 117, the auxiliary groove 117 may be formed in a trapezoid shape, a fan shape or a rectangular shape, and the auxiliary groove 117 may be formed in other shapes such as a triangle shape, a semicircle shape or the like.

Wherein, through setting up auxiliary groove 117 for the distance between gradual change face 116 and the periphery wall of rotor 2 changes, and the shape design of auxiliary groove 117 is nimble optional, sets for according to concrete processing demand is nimble. Therefore, by arranging the auxiliary groove 117, an air gap magnetic field between the stator pole shoe 115 and the rotor 2 is further improved, iron loss is reduced, and the effect of improving the power of the motor is achieved.

In some embodiments, the center position of the auxiliary slot 117 is offset from the corresponding middle radial line 118 of the stator tooth 114, where it should be noted that the middle radial line 118 of the stator tooth 114 refers to a line which is positioned at the center in the width direction of the stator tooth 114 (the circumferential direction of the stator core 1) and extends in the radial direction of the stator yoke portion 111. And the center position of the auxiliary slot 117 is located between 0 deg. and 25 deg. of the middle radial line 118 of the stator teeth 114 in the reverse direction of the rotation direction of the rotor 2, as shown in fig. 3, the rotor 2 may be configured to rotate in the counterclockwise direction, the auxiliary slot 117 is located between 0 deg. and 25 deg. of the middle radial line 118 in the clockwise direction about the central axis of the rotor 2, as the auxiliary slot 117 is located on 10 deg., 15 deg. or 19 deg. of the middle radial line 118 in the clockwise direction about the central axis of the rotor 2.

In some embodiments, the ratio of the circumferential dimension of the tapered surface 116 to the outer circumferential dimension of the stator yoke 111 ranges from 0.24 to 0.4, such as the ratio of the circumferential dimension of the tapered surface 116 to the outer circumferential dimension of the stator yoke 111 is 0.26, 0.31, or 0.39. Setting the ratio within this range facilitates setting the arrangement and number of the stator teeth 114, for example, the stator teeth 114 may be set to three. Wherein, the excircle size range of the stator punching sheet 11 is 24 mm-36 mm.

The utility model also provides a stator core 1.

In some embodiments, the stator core 1 includes a plurality of stator laminations 11 in any one of the above embodiments, and the plurality of stator laminations 11 are stacked in sequence, and the stator core 1 is formed by sequentially stacking the plurality of stator laminations 11.

And when actual design, the stator yoke portion 111 of two adjacent stator punching 11 in a plurality of stator punching 11 sets up to link to each other for detachably, if set up grafting structure on two stator yoke portion 111 relative surfaces, can set up the grafting projection on the surface of one of them stator yoke portion 111, the surface of another stator yoke portion 111 sets up the grafting recess to in pegging graft the grafting projection to the grafting recess, realize adjacent stator yoke portion 111's grafting cooperation, do benefit to and dismantle and install in a flexible way.

Each stator lamination 11 of the stator core 1 includes a stator yoke portion 111 and a plurality of stator teeth 114, the plurality of stator teeth 114 are distributed at intervals in the circumferential direction inside the stator yoke portion 111, the stator teeth 114 extend inward along the radial direction of the stator yoke portion 111, a stator pole shoe 115 is formed at the top of the inner end of each stator tooth 114, a tapered surface 116 is formed on the inner surface of the stator pole shoe 115 corresponding to at least one stator tooth 114 of the plurality of stator teeth 114, and the distance between the tapered surface 116 and the central axis of the stator yoke portion 111 is different at least two positions in the circumferential direction of the tapered surface 116, so that the tapered surface 116 is used for forming an uneven gap with the outer circumferential wall of the rotor 2.

Wherein, this stator core 1 can use with rotor 2 cooperation, if install rotor 2 in stator core 1, so that gradual change face 116 and rotor 2's periphery wall interval relative distribution, thereby inject inhomogeneous clearance between gradual change face 116 and rotor 2's periphery wall, thereby do benefit to the air gap magnetic conductance harmonic that changes brushless motor 100, thereby make brushless motor 100's iron loss and eddy current loss obtain showing and reduce, thereby motor weight reduces, realize that motor work efficiency and power density obtain promoting, thereby promote entire system's energy-conserving effect.

In actual design, the stator core 1 may be configured such that the distance between the gradually-changing surface 116 and the central axis of the rotor 2 gradually increases or gradually decreases in the circumferential direction along the gradually-changing surface 116. That is, the distance between the gradual change surface 116 and the central axis of the rotor 2 may be gradually increased in the circumferential direction along the gradual change surface 116, or the distance between the gradual change surface 116 and the central axis of the rotor 2 may be gradually decreased in the circumferential direction along the gradual change surface 116, so that an uneven gap may be formed between the stator pole shoe 115 and the rotor 2, thereby improving the change of the air gap magnetic conductance harmonics of the brushless motor 100 and improving the motor efficiency of the brushless motor 100. As shown in fig. 2, the gradually-changing surface 116 is a smooth curved surface in the clockwise direction in the circumferential direction of the rotor 2, and the distance between the gradually-changing surface 116 of the stator pole piece 115 and the outer circumferential wall of the rotor 2 gradually increases, so that an uneven gap having a gradually-increasing width in the clockwise direction in the circumferential direction of the rotor 2 is formed.

And, in some embodiments, the tapered surface 116 of the stator core 1 includes a plurality of segments of the substructure surface, which are sequentially connected in the circumferential direction of the stator yoke portion 111, thereby forming the complete tapered surface 116. In which the substructure surfaces are configured as circular arc surfaces and/or straight profiles, that is, some of the plurality of substructure surfaces may be configured as circular arc surfaces and some may be configured as straight profiles, for example, in the actual design, the substructure surfaces may be set to three segments, where two segments of the substructure surfaces may be configured as circular arc surfaces and the other segment of the substructure surfaces may be configured as straight profiles, so that after the rotor 2 is installed in the stator core 1, an uneven gap may be formed.

Further, in other embodiments, the outer circumferential wall of the stator yoke portion 111 of the stator core 1 may be configured to have a plurality of spline lines, at least one of which is a straight line segment 112 and/or at least one of which is an arc segment 113. It should be noted that the outer circumferential wall of the conventional stator yoke 111 is a full circle, that is, the stator yoke 111 has a smooth curved surface and no edge feeling. From this, through setting up multistage spline especially with at least one of them setting up to straightway 112, can do the processing shaping of cutting edge for the periphery wall from stator yoke portion 111, so set up, not only do benefit to the overall structure size that reduces stator yoke portion 111, reduce brushless motor 100's whole weight, and do benefit to and improve motor power density. In the actual design, the design number of the straight line segments 112 may be flexibly set according to the actual design requirement, for example, the number of the straight line segments 112 is greater than the number of the circular arc segments 113, or the number of the straight line segments 112 is less than the number of the circular arc segments 113, or the number of the straight line segments 112 is the same as the number of the circular arc segments 113, and as shown in fig. 1 to 4, the number of the straight line segments 112 and the number of the circular arc segments 113 are both set to three, and the three straight line segments 112 and the three circular arc segments 113 are distributed in a staggered manner in the circumferential direction of the stator yoke 111.

In the embodiment as shown in fig. 4, the utility model provides a stator core 1, and include stator lamination 11 and winding 12, stator lamination 11 includes stator yoke 111 and at least three stator tooth 114, the excircle of stator yoke 111 includes straightway 112 and distributes the circular arc section 113 on the same circle, stator tooth 114 evenly distributes in the inboard of stator yoke 111 along the circumferencial direction of stator yoke 111, the radial inner end of each stator tooth 114 forms stator pole shoe 115 along circumferential extension, stator pole shoe 115 is asymmetric about middle part radial line 118, the distance between the gradual change face 116 of each stator pole shoe 115 and the central axis of stator yoke 111 increases or reduces from one end of stator pole shoe 115 to the other end gradually; the winding 12 is composed of a plurality of coils, each of which is wound on a single stator tooth 114. Wherein, every straightway 112 of stator yoke portion 111 excircle is symmetrical about middle part radial line 118, and two adjacent straightways 112 link to each other through the straight line, through above-mentioned design, multiplicable material utilization on the one hand reduces the material extravagant, and on the other hand increases the auxiliary groove 117 area, reduces the copper and consumes, promotes work efficiency.

In other embodiments, two sides of the radially outer end of each stator tooth 114 are respectively formed with one yoke section, and the yoke sections of the plurality of stator teeth 114 are sequentially connected in the circumferential direction of the stator lamination 1 to form the stator yoke 111. That is to say, in actual design, the stator yoke portion 111 of each stator lamination 1 is designed in segments, that is, the stator yoke portion 111 is distributed in a plurality of yoke sections, and the plurality of yoke sections are respectively integrally formed with different stator teeth 114. For example, each stator lamination 1 includes 3 stator teeth 114, and two sides of the radially outer end of each stator tooth 114 are respectively extended to form a yoke section. When the stator core 1 is installed, the plurality of stator laminations 1 can be sequentially stacked along the axial direction and connected to form the whole stator core 1, and then the yoke sections of two adjacent stator tooth portions 114 of each stator lamination 1 are connected, so that six yoke sections of each stator lamination 1 are sequentially connected in the circumferential direction of the stator lamination 1 to form a complete stator yoke 111, and the stator laminations 1 are fixedly connected.

The utility model also provides a brushless motor.

In some embodiments, the brushless motor includes the stator core 1 and the rotor 2 of the above embodiments, the stator core 1 is sleeved outside the rotor 2, the rotor 2 includes a magnetic ring 21 and a rotating shaft 22, the magnetic ring 21 is fixedly sleeved outside the rotating shaft 22, and the magnetic ring 21 and the rotating shaft 22 can be fixedly connected in a circumferential direction, so that the magnetic ring 21 and the rotating shaft 22 rotate together relative to the stator core 1. In the actual design, an uneven gap is formed between the gradual change surface 116 and the outer peripheral wall of the magnetic ring 21, and the distance between the gradual change surface 116 and the magnetic ring 21 is in the range of 0.3mm to 1mm.

The protective sleeve 23 is disposed outside the magnetic ring 21, and the protective sleeve 23 can prevent the magnetic ring 21 from being damaged by a centrifugal force at a high rotation speed, so as to improve the safety of the brushless motor 100. The thickness of the magnetic ring 21 is 1.8 mm-2.8 mm.

The structure of the brushless motor 100 according to each embodiment of the present invention will be described below with reference to fig. 1 to 7.

In the first embodiment, as shown in fig. 1, the brushless motor 100 includes a stator core 1, a winding 12, and a rotor 2, the stator core 1 includes a stator yoke portion 111 and at least three stator tooth portions 114, an outer circle of the stator yoke portion 111 is formed by a multi-segment spline curve, and the multi-segment spline curve includes at least one straight line segment 112 and/or at least one circular arc segment 113. The stator teeth 114 are uniformly distributed on the inner side of the stator yoke 111 along the circumferential direction of the stator yoke 111, the radial inner end of each stator tooth 114 extends along the circumferential direction to form a stator pole shoe 115, the stator pole shoes 115 are asymmetric about a middle radial line 118, and the distance between the gradual change surface 116 of each stator pole shoe 115 and the central axis of the stator yoke 111 gradually increases or decreases from one end of the stator pole shoe 115 to the other end. The winding 12 is composed of a plurality of coils, each of which is wound on a single stator tooth 114 of the stator core 1. The rotor 2 comprises a magnetic ring 21 and a rotating shaft 22, and the rotor 2 is arranged in an inner hole of the stator core 1.

An uneven air gap is formed between the stator core 1 and the rotor 2, the design of the uneven air gap can change the magnetic conductance harmonic phase of the air gap, the air gap harmonic magnetic field generated by the fundamental wave of the winding 12 and the time harmonic current is reduced, the eddy current loss and the iron loss of the magnetic steel are greatly reduced, and therefore the effect of improving the efficiency is achieved, and the magnetic motor is shown in fig. 5. Meanwhile, each straight line segment 112 of the outer circle of the stator yoke portion 111 is symmetrical with respect to the middle radial line 118 of the stator tooth portion 114, and two adjacent straight line segments 112 are connected by a circular arc segment 113, so that the weight of the stator can be reduced without affecting the performance of the brushless motor 100, as shown in table 1.

TABLE 1

Meanwhile, the ratio of the inner circle size of the stator tooth part 114 to the outer circle size of the stator yoke part 111 is in the range of 0.24-0.4, and the size range of the uneven gap is 0.3-1 mm, as shown in fig. 6, on the basis of ensuring good temperature rise performance of the winding 12, the air gap harmonic magnetic field generated by fundamental wave and time harmonic current of the winding 12 can be reduced, the eddy current loss and the iron loss of the magnetic steel are greatly reduced, and therefore the effect of improving the efficiency is achieved.

In the second embodiment, as shown in fig. 3, the present invention provides a brushless motor 100, including stator core 1, winding 12 and rotor 2, stator core 1 includes stator yoke portion 111 and at least three stator teeth portion 114, the outer circle of stator yoke portion 111 is composed of a multi-segment spline curve, and the multi-segment spline curve includes at least one segment of straight line segment 112 and/or at least one segment of circular arc segment 113. The stator teeth 114 are uniformly distributed on the inner side of the stator yoke 111 along the circumferential direction of the stator yoke 111, the radial inner end of each stator tooth 114 extends along the circumferential direction to form a stator pole shoe 115, the stator pole shoes 115 are asymmetric with respect to a middle radial line 118, and the distance between the gradient surface 116 of each stator pole shoe 115 and the central axis of the stator yoke 111 gradually increases or decreases from one end of each stator pole shoe 115 to the other end. Meanwhile, an auxiliary groove 117 is formed on a gradual change surface 116 of the stator pole shoe 115, fig. 7 is a change curve of the motor efficiency along with an angle of the auxiliary groove 117 deviating from a middle radial line 118 of the stator tooth portion 114, wherein the effect is optimal when the auxiliary groove 117 reversely deviates from 0 to 25 degrees along the rotation direction of the rotor 2, and the structure can further improve the air gap magnetic field, reduce the iron loss and achieve the effect of improving the motor efficiency.

According to the brushless motor 100 provided by the embodiment of the utility model, through the optimized design of the inner and outer outlines of the stator tooth part 114 and the stator yoke part 111, the magnetic conductance harmonic wave of the air gap of the motor is changed, the electromagnetic loss of the motor is reduced, so that the brushless motor 100 can realize higher working efficiency at high rotating speed, and meanwhile, the outer circle of the stator is trimmed, the weight of the motor is reduced, and the power density of the motor is improved; meanwhile, the optimal ranges of the motor stator crack ratio, the air gap and the thickness of the magnetic ring 21 are obtained, so that the optimal proportion of the copper consumption and the iron consumption of the motor is realized, and the motor can realize higher working efficiency at high rotating speed.

The utility model discloses a fan has been proposed again.

According to the utility model discloses the fan is provided with the brushless motor 100 of any kind of embodiment of the aforesaid, through setting up this brushless motor 100 for this fan when specifically using, can change the air gap magnetic conductance harmonic of brushless motor 100 of its installation effectively, thereby make brushless motor 100's iron loss and eddy current loss obtain showing and reduce, thereby motor weight reduces, realizes that motor work efficiency and power density obtain promoting, thereby promote entire system's energy-conserving effect, promote the operating efficiency of fan.

The brushless motor 100 of the blower fan, by providing the stator core 1 and the rotor 2 which are mutually matched, particularly configures the stator core 1 to include a stator yoke portion 111 and a plurality of stator teeth 114, the plurality of stator teeth 114 are distributed at intervals in the circumferential direction inside the stator yoke portion 111, the stator teeth 114 extend inward in the radial direction of the stator yoke portion 111, the top of the inner end of each stator tooth 114 is formed with a stator pole shoe 115, the inner surface of the stator pole shoe 115 corresponding to at least one stator tooth 114 of the plurality of stator teeth 114 is formed with a tapered surface 116, and the distance between the tapered surface 116 and the central axis of the stator yoke portion 111 is unequal at least two positions in the circumferential direction of the tapered surface 116, so that the tapered surface 116 is used for forming an uneven gap with the outer circumferential wall of the rotor 2. Thereby installing rotor 2 in stator core 1, so that gradual change face 116 and rotor 2's periphery wall interval relative distribution, thereby inject inhomogeneous clearance between gradual change face 116 and rotor 2's periphery wall, thereby do benefit to the air gap magnetic conductance harmonic that changes brushless motor 100, thereby make brushless motor 100's iron loss and eddy current loss obtain showing and reduce, thereby motor weight reduces, realize that motor work efficiency and power density obtain promoting, thereby promote entire system's energy-conserving effect.

The utility model also provides a floor cleaning machine.

According to the utility model discloses floor cleaning machine is provided with the fan of above-mentioned embodiment, has through the setting the utility model discloses brushless motor 100's fan for this floor cleaning machine is when the operation, and brushless motor 100's air gap magnetic conductance harmonic changes, thereby makes motor iron loss and eddy current loss obtain showing and reduces, realizes that motor work efficiency and power density obtain promoting, thereby greatly promotes floor cleaning machine's whole operating efficiency, makes floor cleaning machine satisfy user's user demand.

In the description of the present invention, it is to be understood that the terms "center", "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, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features.

In the description of the present invention, "a plurality" means two or more.

In the description of the present invention, the first feature "on" or "under" the second feature may include the first and second features being in direct contact, and may also include the first and second features being in contact with each other not directly but through another feature therebetween.

In the description of the invention, the first feature being "on", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (15)

1. A stator lamination (11), comprising:

the stator punching sheet comprises a stator yoke portion (111) and a plurality of stator teeth portions (114), the plurality of stator teeth portions (114) are distributed at intervals in the circumferential direction on the inner side of the stator yoke portion (111), the stator teeth portions (114) extend inwards in the radial direction of the stator yoke portion (111), a stator pole shoe (115) is formed at the top of the inner end of each stator tooth portion (114), and the inner surface of the stator pole shoe (115) corresponding to at least one stator tooth portion (114) in the plurality of stator teeth portions (114) is configured into a gradual change surface (116); wherein, the first and the second end of the pipe are connected with each other,

the distance between the gradual change surface (116) and the central axis of the stator yoke (111) is configured to gradually increase or decrease from one end to the other end of the stator pole shoe (115) in the circumferential direction of the stator yoke (111).

2. The stator lamination (11) according to claim 1, wherein the tapered surface (116) comprises a multi-segment substructure surface, and the substructure surface is configured as a circular arc surface and/or a straight profile surface.

3. The stator lamination (11) according to claim 2, wherein one of the plurality of sections of the sub-structural surface is a main structural curved surface, and a distance between the main structural curved surface and a central axis of the stator yoke portion (111) is the same in a circumferential direction along the gradual change surface (116).

4. The stator punching (11) according to claim 1, characterized in that the outer circle dimension of the stator punching (11) is 24-36 mm.

5. The stator lamination (11) as recited in claim 1, wherein the minimum distance of the gradual change surface (116) to the central axis of the stator yoke portion (111) is d1, satisfying: d1 is more than or equal to 0.3mm and less than or equal to 1mm.

6. The stator lamination (11) according to any one of claims 1 to 5, wherein the outer peripheral wall of the stator yoke portion (111) is configured to have a plurality of segments of spline lines, at least one segment of the plurality of segments of spline lines being a straight segment (112) and/or at least one segment being a circular segment (113).

7. The stator punching sheet (11) according to claim 6, wherein the number of the straight line segments (112) is the same as the number of the stator teeth (114), and a plurality of the straight line segments (112) correspond to a plurality of the stator teeth (114) one by one; wherein, the first and the second end of the pipe are connected with each other,

the straight line segments (112) and the corresponding stator teeth (114) are distributed in the radial direction of the stator yoke portion (111) in a facing manner.

8. Stator lamination (11) according to any one of claims 1 to 5, wherein the tapering surface (116) is provided with an auxiliary groove (117), the auxiliary groove (117) being formed in the tapering surface (116) recessed in a radial direction of the stator yoke (111).

9. The stator lamination (11) according to claim 8, wherein the center position of the auxiliary slot (117) is offset from the corresponding radial line (118) of the middle portion of the stator tooth portion (114), and the center position of the auxiliary slot (117) is located between 0 ° and 25 ° of the reverse rotation of the radial line (118) of the middle portion of the stator tooth portion (114) along the rotation direction of the rotor (2).

10. The stator lamination (11) according to any one of claims 1 to 5, wherein a ratio of a circumferential dimension of the gradual change surface (116) to an outer circumferential dimension of the stator yoke portion (111) ranges from 0.24 to 0.4.

11. A stator core (1), comprising a plurality of stator laminations (11) according to any one of claims 1 to 10, the plurality of stator laminations (11) being stacked in sequence.

12. The stator core (1) according to claim 11, wherein each of the stator teeth (114) is formed with a yoke section at each of both sides of a radially outer end thereof, and the yoke sections of the plurality of stator teeth (114) are sequentially connected in a circumferential direction of the stator lamination (11) to form the stator yoke (111).

13. A brushless electric machine, comprising a rotor (2) and a stator core (1) according to claims 11-12, wherein the stator core (1) is sleeved outside the rotor (2), and a non-uniform gap is formed between the gradual change surface (116) and the outer circumferential wall of the rotor (2).

14. A fan characterized in that the brushless motor according to claim 13 is provided.

15. A floor washing machine characterized in that a fan according to claim 14 is provided.

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