CN214590823U

CN214590823U - Rotor, motor, domestic appliance, garden instrument and vehicle

Info

Publication number: CN214590823U
Application number: CN202023152336.XU
Authority: CN
Inventors: 高江明
Original assignee: Kingclean Electric Co Ltd; Jiangsu Kingclean Intelligent Appliance Co Ltd
Current assignee: Kingclean Electric Co Ltd; Jiangsu Kingclean Intelligent Appliance Co Ltd
Priority date: 2020-12-23
Filing date: 2020-12-23
Publication date: 2021-11-02
Anticipated expiration: 2030-12-23

Abstract

The utility model relates to a rotor, motor, domestic appliance, garden instrument and vehicle. The rotor includes: a rotor core; the rotor core comprises a rotor yoke portion and a rotor tooth portion, the rotor tooth portion is evenly connected to the outer side of the rotor yoke portion along the circumferential direction, the rotor yoke portion is made of non-ferromagnetic materials, and the rotor tooth portion is made of ferromagnetic materials. The motor comprises a stator and the rotor. The household appliance, the garden tool or the vehicle comprises the motor. Above-mentioned rotor can reduce the magnetic leakage, improves the utilization ratio of magnet steel, reduces the size of the motor of using this rotor, and then reduces the cost of motor, improves its market competition.

Description

Rotor, motor, domestic appliance, garden instrument and vehicle

Technical Field

The utility model relates to the technical field of motors, especially relate to a rotor, motor, domestic appliance, garden instrument and vehicle.

Background

The motor is a device for realizing electric energy conversion or transmission, wherein, the application range of the permanent magnet motor is extremely wide and almost extends to various fields of aerospace, national defense, industrial and agricultural production and daily life. Especially, the embedded permanent magnet brushless motor has high structural strength, large salient pole ratio, easy field weakening and speed expansion, and high field weakening operation efficiency, and is very suitable for application occasions of low-speed and high-speed alternate operation.

However, in the related art, the magnetic leakage of the rotor core of some embedded permanent magnet brushless motors is high, which results in low utilization rate of magnetic steel, large volume of the motor, relatively high cost and insufficient market competitiveness.

SUMMERY OF THE UTILITY MODEL

Based on this, the utility model provides a rotor can reduce the magnetic leakage, improves the utilization ratio of magnet steel, reduces the size of the motor of using this rotor, and then reduces the cost of motor, improves its market competition.

The utility model discloses still provide a motor, through using foretell rotor, can reduce the size, and then reduce the cost of motor, improve its market competition.

The utility model discloses still provide a domestic appliance, through using foretell motor, can reduce cost, improve its market competition.

The utility model discloses still provide a garden instrument, through using foretell motor, can reduce cost, improve its market competition.

The utility model discloses still provide a vehicle, through using foretell motor, can reduce cost, improve its market competition.

The utility model adopts the following technical scheme:

a rotor, comprising:

a rotor core;

the rotor core comprises a rotor yoke portion and a rotor tooth portion, the rotor tooth portion is evenly connected to the outer side of the rotor yoke portion along the circumferential direction, the rotor yoke portion is made of non-ferromagnetic materials, and the rotor tooth portion is made of ferromagnetic materials.

In one embodiment, the rotor yoke portion is detachably connected to the rotor tooth portion.

In one embodiment, the rotor yoke is clamped to the rotor teeth.

In one embodiment, the rotor yoke comprises a rotor yoke body and a plurality of protruding members, the protruding members are uniformly connected to the outer side of the rotor yoke body along the circumferential direction, clamping grooves are formed in the rotor teeth, and the protruding members are clamped in the clamping grooves.

In one embodiment, the protruding member includes a first section and a second section distributed along a radial direction of the rotor core, the second section is connected to an end of the first section, and a width of the second section in a direction perpendicular to the radial direction of the rotor core is gradually increased along the radial direction of the rotor core.

In one embodiment, a magnetic steel slot is defined between adjacent rotor teeth, and magnetic steel is arranged in the magnetic steel slot;

the rotor yoke main body comprises a first boss and a second boss, the first boss and the second boss are respectively connected with two sides of the extension pieces, and in two adjacent extension pieces, the first boss connected with one extension piece and the second boss connected with the other extension piece are both abutted against the first end of the magnetic steel;

and a third boss is arranged at the outer end of the rotor tooth part along the radial direction of the rotor core, and a second end of the magnetic steel, which is positioned at the opposite side of the first end, abuts against the third boss.

In one embodiment, a groove is defined between the first boss and the second boss, a preload piece is arranged on a groove wall of the groove, the preload piece is located on the outer sides of the first boss and the second boss along the radial direction of the rotor core, and the first end abuts against the preload piece.

In one embodiment, a plurality of the preload pieces distributed along the circumferential direction of the rotor yoke portion are arranged between the first boss and the second boss, and/or a plurality of the preload pieces distributed along the axial direction of the rotor yoke portion are arranged between the first boss and the second boss, and the first end abuts against the plurality of the preload pieces.

An electric machine comprising the rotor described above.

In one embodiment, an end surface of the rotor tooth portion, which is far away from the rotor yoke portion, is a first arc surface, a center of a circle of the first arc surface is a first center of a circle, and a trajectory of the first centers of the plurality of rotor tooth portions forms a circle with a center of the rotor core as a center of a circle.

In one embodiment, the motor further includes a stator core, the rotor core is disposed inside the stator core, the stator core includes stator teeth, pole shoes are formed at ends of the stator teeth close to the rotor core, and end faces of the pole shoes close to the rotor core are second arc faces protruding towards the rotor core.

In one embodiment, an equivalent circle tangent to the first cambered surface is formed by taking the center of the rotor core as a second circle center, and the diameter of the equivalent circle is D₀The diameter of the first cambered surface is D₁The diameter of the second cambered surface is D₂，0.5D₀≤D₁＜D₀，D₀≤D₂≤3.5D₀。

Domestic appliance, garden instrument or vehicle includes above-mentioned motor.

In the rotor, the yoke part of the rotor is made of non-ferromagnetic material, and the tooth part of the rotor is made of ferromagnetic material, namely, the yoke part of the rotor is not magnetic conductive, and the tooth part of the rotor is magnetic conductive. If rotor yoke portion and rotor tooth portion all adopt ferromagnetic material, when the design, need satisfy on the rotor yoke portion with the splice bar department intensity that rotor tooth portion is connected higher, have better mechanical properties, but this can lead to splice bar department magnetic leakage more, and electromagnetic properties is relatively poor. And after the yoke part of the rotor adopts non-ferromagnetic materials, the connecting ribs are not magnetic-conductive, so that magnetic leakage is not generated on the premise of meeting the mechanical property, and the utilization rate of the magnetic steel can be improved. In addition, after the rotor yoke part adopts the structure, the air gap flux density can be improved, and the air gap flux density is inversely proportional to the size of the motor, so that the size of the motor using the rotor can be reduced, the cost of the motor is further reduced, and the market competitiveness of the motor is improved.

Above-mentioned motor through using above-mentioned rotor, can reduce the size of the motor of this rotor, and then reduces the cost of motor, improves its market competition.

Above-mentioned domestic appliance through using above-mentioned motor, can reduce cost, improves its market competition.

Above-mentioned garden instrument through using above-mentioned motor, can reduce cost, improves its market competition.

The vehicle can reduce the cost and improve the market competitiveness by applying the motor.

Drawings

FIG. 1 is a schematic structural view of a rotor core;

FIG. 2 is a top view of a rotor core;

FIG. 3 is a schematic structural view of a rotor yoke portion of the rotor core of FIG. 1;

fig. 4 is a schematic structural view of rotor teeth of the rotor core of fig. 1;

FIG. 5 is a waveform of line back EMF when a conventional structure is used for a rotor core;

fig. 6 is a waveform diagram of a line back electromotive force when the rotor core has the structure shown in fig. 1;

FIG. 7 is a waveform of air gap flux density for a rotor core using a prior art configuration;

FIG. 8 is a waveform of air gap flux density for the rotor core of the configuration shown in FIG. 1;

FIG. 9 is a magnetic flux distribution diagram of a rotor core using a conventional structure;

fig. 10 is a magnetic force line distribution diagram of the rotor core having the structure shown in fig. 1;

FIG. 11 is a schematic view of a first lamination of the yoke portion of the rotor of FIG. 3;

FIG. 12 is a schematic structural view of a second lamination of the yoke portion of the rotor of FIG. 3;

FIG. 13 is a schematic structural view of the rotor core of FIG. 1 after magnetic steel is installed therein;

FIG. 14 is a cross-sectional view of the rotor core of FIG. 1 after magnetic steel has been loaded therein;

FIG. 15 is a view of the preload member of FIG. 13 in positional relationship to the first boss and the second boss;

FIG. 16 is a view showing the positional relationship between the preload member and the magnetic steel and the first boss and the second boss shown in FIG. 13;

fig. 17 is a schematic structural view of a rotor core and a stator core in the prior art;

fig. 18 is a schematic structural view of a rotor core and a stator core according to an embodiment of the present invention;

FIG. 19 is a cogging torque waveform diagram of the rotor core and stator core configuration of FIG. 17;

FIG. 20 is a cogging torque waveform diagram of the rotor core and stator core configuration of FIG. 18;

FIG. 21 is a load torque waveform diagram of the rotor core and stator core configuration shown in FIG. 17;

FIG. 22 is a load torque waveform of the rotor core and stator core configuration shown in FIG. 18;

fig. 23 is a line back emf waveform for the rotor core and stator core configuration shown in fig. 17;

fig. 24 is a line back emf waveform for the rotor core and stator core configuration shown in fig. 18;

fig. 25 is a waveform diagram of load line back emf for the rotor core and stator core configuration shown in fig. 17;

fig. 26 is a waveform diagram of load line back emf for the rotor core and stator core configuration shown in fig. 18;

FIG. 27 is a waveform of electromagnetic power for the rotor core and stator core configuration shown in FIG. 17;

fig. 28 is an electromagnetic power waveform diagram of the rotor core and stator core structure shown in fig. 18.

Reference numerals:

the rotor comprises a rotor core 100, a rotor yoke portion 110, a rotor yoke portion main body 111, a first boss 1111, a second boss 1112, a groove 1113, a protruding piece 112, a first section 1121, a second section 1122, a preload piece 113, a first punching sheet 110a, a second punching sheet 110b, a rotor tooth portion 120, a first arc surface 121, a clamping groove 122, a third boss 123, an equivalent circle 130 and a magnetic steel groove 140;

stator core 200, stator teeth 210, pole shoes 211, second arc 2111, winding slots 220;

magnetic steel 300.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

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.

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

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

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

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

Referring to fig. 1 to 4, a schematic structural diagram of a rotor core, a plan view of the rotor core, a schematic structural diagram of a rotor yoke portion of the rotor core in fig. 1, and a schematic structural diagram of a rotor tooth portion of the rotor core in fig. 1 are respectively shown.

The rotor includes rotor core 100, and rotor core 100 includes rotor yoke portion 110 and rotor tooth 120, and rotor tooth 120 is equipped with a plurality ofly, and a plurality of rotor teeth 120 evenly connect in the outside of rotor yoke portion 110 along the circumferencial direction. In rotor core 100, rotor yoke portion 110 and rotor teeth portion 120 are made of different materials, wherein rotor yoke portion 110 is made of a non-ferromagnetic material, and rotor teeth portion 120 is made of a ferromagnetic material. That is, only rotor tooth 120 conducts magnetic current, and rotor yoke 110 does not conduct magnetic current.

Specifically, the rotor yoke 110 may be made of stainless steel, or may be made of other non-ferromagnetic materials such as magnesium alloy, zinc alloy, aluminum alloy, brass, high manganese steel, and the like. Rotor teeth 120 may be formed from non-oriented silicon steel.

If rotor yoke portion 110 and rotor tooth portion 120 all adopt ferromagnetic material, when the design, if will satisfy the mechanical properties requirement, make rotor yoke portion 110 go up the splice bar department intensity of being connected with rotor tooth portion 120 enough high, then need increase the width of splice bar, but this can lead to splice bar department magnetic leakage more, and the utilization ratio of magnet steel is lower, and electromagnetic properties is relatively poor. If satisfy its electromagnetic properties, make its magnetic leakage less, then need reduce the width of splice bar, nevertheless the width reduces the back, and when the high-speed rotation of motor, splice bar department takes place to warp easily, makes the vibration noise increase of motor. Therefore, in the conventional design, a balance point between the electromagnetic performance and the mechanical performance is usually required to be found, but obviously, the electromagnetic performance and the mechanical performance at the balance point are not optimal.

In the embodiment, after the rotor yoke portion 110 is made of the non-ferromagnetic material, the connecting rib on the rotor yoke portion 110 connected to the rotor tooth portion 120 is not magnetically conductive, so that the electromagnetic performance is not affected by the width change of the rotor yoke portion, and only the influence on the mechanical performance can be considered. After the width of the connecting rib is increased, the strength of the connecting rib is higher, deformation is not easy to generate, and vibration noise of the motor can be reduced. And, compare with the structure that has the same width splice bar among the existing structure, the magnetic leakage reduces by a wide margin, and electromagnetic properties can optimize. The above-described connecting rib is a portion of the protrusion 112 located between the rotor tooth portion 120 and the rotor yoke body 111.

Referring to fig. 5 and 6, waveforms of back electromotive force of a wire when the rotor core is in the conventional structure and the rotor core in the structure shown in fig. 1 are respectively shown. In fig. 5, the rotor yoke portion and rotor tooth portion connecting rib is made of silicon steel sheet and has a width of 1.1mm, and in fig. 6, the rotor yoke portion 110 and rotor tooth portion 120 connecting rib is made of stainless steel and has a width of 1.6 mm. Under the condition that other parameters such as the number of turns of the coil are the same, the effective value of the line back potential in fig. 6 is 31% lower than that in fig. 5, namely, the leakage flux is reduced by 31%.

Referring to fig. 9 and 10, a magnetic force line distribution diagram when the rotor core is in the conventional structure and a magnetic force line distribution diagram when the rotor core is in the structure shown in fig. 1 are respectively shown. As can be seen from comparison, in fig. 10, the magnetic lines of force are distributed more uniformly and densely on the rotor teeth 120, and almost all the regions have the magnetic lines of force, so that the effect of reducing the magnetic flux leakage is more obvious.

Referring to fig. 7 and 8, waveforms of air gap flux density when the rotor core is in the conventional structure and waveforms of air gap flux density when the rotor core is in the structure shown in fig. 1 are respectively shown. By contrast, in fig. 8, the air gap magnetic density is larger. Since the air gap flux density is inversely proportional to the size of the motor, when the rotor core 100 is arranged in the above manner, the size of the motor using the rotor can be reduced, thereby reducing the cost of the motor and improving the market competitiveness of the motor.

Because rotor yoke portion 110 selects different materials to make with rotor tooth portion 120, it is lower to select the mode degree of difficulty of split type manufacturing. The two are manufactured respectively, and after the manufacture is finished, the two are fixedly connected. Preferably, rotor yoke 110 and rotor teeth 120 are detachably connected. As described above, when any one of rotor yoke portion 110 and rotor tooth portion 120 is damaged during use, only the damaged component can be removed and replaced without replacing rotor core 100 as a whole. Therefore, the cost can be reduced to a certain extent, and the market competitiveness of the product is improved.

Specifically, rotor yoke 110 and rotor teeth 120 are fixed by snap-fit. The clamping structure is convenient to disassemble and assemble, and the electromagnetic performance of the joint of the clamping structure and the clamping structure cannot be influenced.

With continued reference to fig. 1 to 4, the rotor yoke 110 includes a rotor yoke body 111 and a plurality of protrusions 112, and the plurality of protrusions 112 are uniformly connected to the outer side of the rotor yoke body 111 in the circumferential direction. Clamping grooves 122 are formed in the rotor tooth portions 120, the shape and the size of the protruding parts 112 are matched with those of the clamping grooves 122, each protruding part 112 is clamped in one corresponding clamping groove 122, and the protruding parts and the corresponding clamping grooves are in interference fit, so that the rotor yoke portion 110 and the rotor tooth portions 120 are fixedly connected.

Of course, the positions of the projections 112 and the slots 122 may be switched, and for example, the projections 112 may be provided on the rotor teeth 120 and the slots 122 may be provided on the rotor yoke body 111.

Further, the slots 122 may be configured as dovetail slots, and the protrusions 112 may be configured as mating dovetail teeth. Specifically, the protruding member 112 includes a first segment 1121 and a second segment 1122, and the second segment 1122 is integrally connected to an end of the first segment 1121. Second segment 1122 is located outside first segment 1121 in the radial direction of rotor core 100. The radial direction of rotor core 100 refers to a direction from the center of rotor core 100 to the outside of rotor core 100. A first plane parallel to the end face of rotor core 100 is defined, and in the first plane, along the radial direction of rotor core 100, first section 1121 has the same width in the direction perpendicular to the radial direction of rotor core 100, and second section 1122 has a gradually increasing width. When vibration or the like occurs in the motor, the second segment 1122 can prevent the rotor yoke 110 and the rotor teeth 120 from moving in the opposite direction in the first plane due to the gradually increased width of the second segment 1122, so that the fixed relationship between the two is stable and the possibility of separation between the two is low.

In addition, the end region of the second section 1122 connected to the rotor tooth 120 is rounded to prevent the rotor tooth 120 from being damaged by a sharp corner when the motor vibrates.

Referring to fig. 3, 4, 11 to 14, fig. 11 to 14 respectively show a schematic structural diagram of a first punching sheet of the rotor yoke portion in fig. 3, a schematic structural diagram of a second punching sheet of the rotor yoke portion in fig. 3, a schematic structural diagram of the rotor core in fig. 1 after magnetic steel is loaded therein, and a cross-sectional view of the rotor core in fig. 1 after magnetic steel is loaded therein. A magnetic steel slot 140 is formed between every two adjacent rotor teeth 120, and magnetic steel 300 with a size matched with that of the magnetic steel slot 140 is inserted into the magnetic steel slot 140.

The rotor yoke body 111 includes a first boss 1111 and a second boss 1112, and the first boss 1111 and the second boss 1112 are respectively connected to both sides of the protrusion 112. In the radial direction of the rotor core 100, the first boss 1111 and the second boss 1112 each protrude in a direction away from the rotor yoke body 111. The outer ends of the rotor teeth 120 are provided with third bosses 123 in the radial direction of the rotor core 100, and each of the third bosses 123 protrudes toward the adjacent rotor tooth 120.

After the magnetic steel 300 is inserted into the magnetic steel slot 140, one end of the magnetic steel 300 will abut against the first boss 1111 and the second boss 1112, and the other end will abut against the third boss 123, so as to fix the magnetic steel 300 in the magnetic steel slot 140. That is, the magnetic steel 300 is fixed to the three bosses by interference fit. In addition, injection molding can be performed between the magnetic steel 300 and the first boss 1111 and the second boss 1112, so that the magnetic steel 300 is more stably fixed in the magnetic steel groove 140, and the position deviation is not easy to occur.

Alternatively, if there is a gap between one end of the magnetic steel 300 and the first boss 1111 and the second boss 1112, the magnetic steel 300 may be injection-molded between the magnetic steel 300 and the first boss 1111 and the second boss 1112 to fill up the gap, and the magnetic steel 300 is fixed in the magnetic steel slot 140.

In the prior art, the magnetic steel 300 is randomly positioned in the magnetic steel groove 140 due to the clearance fit between the magnetic steel 300 and the magnetic steel groove 140, so that the unbalance of the rotor is unstable; moreover, although the magnetic steel 300 is placed in the magnetic steel slot 140 and then is further fixed by plastic coating or other processes, the gap fit between the magnetic steel 300 and the magnetic steel slot 140 may cause unbalance variation along with the operating time, plastic aging, stress release and other factors, so that the motor has large vibration noise, and even the service life is shortened.

In this scheme, when using above-mentioned mode installation magnet steel 300, magnet steel 300 is packed into back both ends and all is supported to hold fixedly, and the difficult position skew that takes place has effectively reduced the unbalance amount change that magnet steel 300 displacement caused and the vibration noise that consequently produces.

Further, in some embodiments, the first boss 1111 and the second boss 1112 protrude away from the rotor yoke body 111, which is equivalent to a groove 1113 formed between the first boss 1111 and the second boss 1112. A preload member 113 is provided at a groove wall of the groove 1113, and the preload member 113 has a certain elasticity. The groove 1113 may be circular arc, rectangular, triangular or other shape.

Referring to fig. 15 and 16, a position relationship diagram of the preload member and the first boss and the second boss in fig. 13, and a position relationship diagram of the preload member and the magnetic steel and the first boss and the second boss in fig. 13 are respectively shown. In the radial direction of the rotor core 100, the preload piece 113 extends out of the first boss 1111 and the second boss 1112, and the range of the gap S1 between the preload piece 113 and the first boss 1111 and the second boss 1112 is 0.1mm or more and S1 or more and 0.3mm or less.

After the magnetic steel 300 is installed in the magnetic steel slot 140, one end of the magnetic steel 300 abuts against the preload piece 113, the first boss 1111, and the second boss 1112, so that the preload piece 113 is bent and deformed, and the other end of the magnetic steel 300 abuts against the third boss 123 to fix the position. When preload element 113 deforms to the maximum, the gap S2 between magnetic steel 300 and first boss 1111 and second boss 1112 is 0.1 mm. Compared with the arrangement of only the first boss 1111 and the second boss 1112, after the preload piece 113 is added, the magnetic steel 300 is more stably abutted and fixed, so that the magnetic steel 300 is not easy to shift, and the unbalance change caused by the displacement of the magnetic steel 300 and the vibration noise generated thereby are effectively reduced. In addition, injection molding can be performed between the magnetic steel 300 and the first boss 1111 and the second boss 1112 to fill the gap S2, so that the fixation of the magnetic steel 300 is more stable.

Although the fastening can be realized by separately arranging the preload member 113 for abutting, if the preload member 113 loses elasticity due to a large bending degree and the position of the magnetic steel 300 is fixed and fails, the magnetic steel 300 may be displaced, resulting in an increase of unbalance and a large vibration noise.

In this embodiment, with preload piece 113, first boss 1111, second boss 1112 combination, even preload piece 113 loses the elasticity, also can support tight magnet steel 300 by first boss 1111 after moulding plastics and second boss 1112, make it be difficult for taking place the offset, effectively reduced the unbalance amount change that magnet steel 300 displacement caused and the vibration noise that consequently produces.

Moreover, the magnetic steel 300 abuts against the preload element 113 to deform the preload element, after the magnetic steel 300 contacts with the first boss 1111 and the second boss 1112, the first boss 1111 and the second boss 1112 also abut against the magnetic steel 300, and the first boss 1111 and the second boss 1112 can limit the continuous deformation of the preload element 113 so as to prevent the preload element 113 from being deformed too much to cause failure, that is, the first boss 1111 and the second boss 1112 can reduce the probability of failure of the preload element 113.

In addition, if the rotor core in the related art is also provided with the first bosses 1111 and the second bosses 1112, the width of the connecting ribs is increased, which results in a serious magnetic flux leakage at the positions. In this embodiment, since the rotor yoke 110 is made of a non-ferromagnetic material and the rotor teeth 120 are made of a ferromagnetic material, even if the first boss 1111 and the second boss 1112 are provided, magnetic flux leakage at these positions is not increased. That is to say, under the same condition, this embodiment can reduce the magnetic leakage to can reduce the air gap flux density, and then reduce the size of the motor of using this rotor, reduce the cost of motor, improve its market competition.

In some embodiments, a plurality of preload members 113 may be disposed between first boss 1111 and second boss 1112, distributed along a circumferential direction of rotor yoke 110. And/or, a plurality of preload members 113 may be provided in the axial direction of the rotor core 100. After the magnetic steel 300 is installed, one end of the magnetic steel can be abutted by the plurality of preload members 113. Thus, the stability of fixing the position of the magnetic steel 300 can be further enhanced, so that the magnetic steel is not easy to shift. Moreover, if one of the preload pieces 113 fails, the other preload pieces 113 can still abut against the magnetic steel 300, so that the fixing relationship is more reliable, the magnetic steel 300 is not easy to shift, and the unbalance change caused by the displacement of the magnetic steel 300 and the vibration noise generated thereby are effectively reduced.

Referring to fig. 11 and 12, the rotor yoke 110 is formed by laminating a plurality of first punching sheets 110a and a plurality of second punching sheets 110b, at least a part of the first punching sheets 110a are provided with a preload member 113 and a groove 1113, and the second punching sheets 110b are provided with a groove 1113. The first punching sheet 110a and the second punching sheet 110b are matched in shape and size, and when the first punching sheet 110a and the second punching sheet 110b are laminated according to a certain proportion, the rotor yoke 110 shown in fig. 3 can be formed. Along rotor core 100's axial, be equipped with a plurality of pretension pieces 113, change the proportion of first punching sheet 110a and second punching sheet 110b when overlying, just enable the quantity change of pretension piece 113. The distribution positions of the first stamped piece 110a and the second stamped piece 110b during lamination are changed, so that the position of the preload piece 113 along the axial direction of the rotor core 100 can be changed, that is, the preload piece 113 can be uniformly distributed in the axial direction of the rotor core 100, and can also be non-uniform.

Referring to fig. 17 and 18, schematic structural diagrams of a rotor core and a stator core in the prior art and a schematic structural diagram of a rotor core and a stator core in an embodiment of the present invention are respectively shown, in some embodiments, a motor includes a rotor in any of the above embodiments, and further includes a stator, and the motor has the beneficial effects of the rotor in any of the above embodiments.

In some embodiments, in the rotor core 100, an outer end surface of the rotor tooth portion 120 away from the rotor yoke portion 110 is in an arc shape, which is defined as a first arc surface 121, and a center of the first arc surface 121 is defined as a first center O₁. First center of a circle O₁Not coinciding with the center position of rotor core 100. Specifically, an equivalent circle 130 tangent to the first arc surface 121 is formed by taking the center of the rotor core 100 as a second center O, where the first center O is a first center₁Not coinciding with the second centre O, i.e. the first centre O₁And is eccentrically arranged relative to the second circle center O. First circle center O of first arc 121 on all rotor teeth 120₁The formed trajectory is also circular, the center of which coincides with the second center O.

In some embodiments, the stator core 200 is sleeved outside the rotor core 100, the stator core 200 includes a plurality of stator teeth 210 uniformly distributed along a circumferential direction, a winding slot 220 is formed between every two adjacent stator teeth 210, a coil is wound on the stator teeth 210, and the winding slot 220 is used for accommodating the coil. A pole shoe portion 211 is formed at an end portion of each stator tooth 210 close to rotor core 100, and an end surface of pole shoe portion 211 close to rotor core 100 is in the shape of an arc surface protruding toward rotor core 100, and this arc surface is defined as a second arc surface 2111. An air gap is formed between the second arc surface 2111 and the equivalent circle 130, and the size of the air gap is delta.

Referring to fig. 19 to 20, a no-load cogging torque waveform diagram of the rotor core and stator core structure shown in fig. 17 and a no-load cogging torque waveform diagram of the rotor core and stator core structure shown in fig. 18 are respectively shown. When the permanent magnet brushless motor operates, a rotating magnetic field is generated, magnetic pulling force generated by the rotating magnetic field can generate tangential force and radial force on the rotor, the tangential force mainly drives the rotor to rotate, and the radial force can enable the motor to vibrate and generate larger vibration noise. The cogging torque reflects the magnitude of the radial magnetic pulling force of the rotor on the stator, and the larger the cogging torque is, the larger the radial magnetic pulling force of the rotor on the stator is. The cogging torque can cause the motor to generate vibration and noise, the rotation speed fluctuation occurs, the motor cannot run stably, the performance of the motor is influenced, and the low-speed performance of the motor in a speed control system and the high-precision positioning of the motor in a position control system are also influenced. As can be seen from comparing fig. 19 and 20, in fig. 20, the cogging torque can be greatly reduced, and therefore, the vibration noise of the motor can be reduced, and the operation thereof can be more stable.

Referring to fig. 21 and 22, a load torque waveform of the rotor core and stator core structure shown in fig. 17 and a load torque waveform of the rotor core and stator core structure shown in fig. 18 are respectively shown. The moment of torsion represents the pivoted strength size of motor, and the moment of torsion fluctuation not only causes the motor body vibration, and the part that even takes the motor direct or indirect contact all can vibrate, is unfavorable for the even running of motor. As can be seen from comparing fig. 21 and 22, when the rotor core 100 and the stator core 200 in the motor are designed according to the structure of fig. 18, the waveform is more gradual, and the torque fluctuation is smaller. Therefore, the vibration noise of the motor can be reduced, and the motor can run more stably.

Referring to fig. 23 and 24, a line back electromotive force waveform diagram of the rotor core and stator core structure shown in fig. 17 and a line back electromotive force waveform diagram of the rotor core and stator core structure shown in fig. 18 are respectively shown. In fig. 23, the peak of the waveform of the line back electromotive force is a flat-top wave, which shows that the performance of the motor is greatly affected by harmonic waves, the harmonic vibration and the harmonic loss of the motor are large, and when the controller vector controls the motor to commutate, the vibration of the motor is large, and correspondingly, the generated vibration noise is also large. In fig. 24, the wave crest of the waveform of the line back electromotive force is smooth, the waveform tends to be sinusoidal, the performance of the motor is less affected by harmonic waves, harmonic vibration and harmonic loss are less, the motor vibration is less when the controller vector controls the motor to commutate, and correspondingly, the vibration noise is less.

Referring to fig. 25 and 26, a load line back electromotive force waveform diagram of the rotor core and stator core structure shown in fig. 17 and a load line back electromotive force waveform diagram of the rotor core and stator core structure shown in fig. 18 are respectively shown. Similarly to the above, in fig. 25, the peak of the waveform of the back electromotive force of the load line is a flat-top wave, and is greatly affected by the harmonic. In fig. 26, the wave crest of the waveform of the counter electromotive force of the load line is smooth, the waveform tends to be sinusoidal, the performance of the motor is less affected by harmonic waves, the harmonic vibration and the harmonic loss are less, the motor vibration is less when the controller vector controls the motor to commutate, and correspondingly, the vibration noise is less.

Referring to fig. 27 and 28, electromagnetic power waveform diagrams of the rotor core and stator core structure shown in fig. 17 and the rotor core and stator core structure shown in fig. 18 are respectively shown. The electromagnetic power fluctuation affects the periodic sound of the motor at high speed. As can be understood from a comparison between fig. 27 and fig. 28, in fig. 28, the difference between the peak and the trough of the electromagnetic power is smaller, i.e., the fluctuation of the electromagnetic power is smaller. Therefore, the periodic sound at the time of high-speed rotation of the motor can be reduced.

To sum up, in the present embodiment, pole shoe portions 211 of stator core 200 are provided to have arc surfaces that protrude toward rotor core 100 on the one hand, and outer end surfaces of rotor teeth 120 of rotor core 100 are provided to have eccentric arc surfaces that are eccentric with respect to the center position of rotor core 100 on the other hand. When the rotor core 100 and the stator core 200 of the motor are arranged according to the above structure, the cogging torque and the torque fluctuation of the motor can be reduced, and the harmonic vibration and the harmonic loss are small, so that the vibration noise of the motor is reduced, and the operation of the motor is more stable. And the fluctuation of electromagnetic power can be reduced, so that the periodic sound of the motor in high-speed rotation is reduced.

The equivalent circle 130 has a diameter D₀The diameter of the first arc 121 of the rotor tooth 120 is D₁The diameter of the second cambered surface 2111 of the pole shoe portion 211 is D₂The virtual inner diameter of stator core 200 is D₃. The virtual inner diameter here is a diameter of a virtual circle formed tangent to the second arc surface 2111 with the second center O as the center, D₃＝D₀+2δ。

Preferably, the parameters satisfy the following relationship: 0.5D₀≤D₁＜D₀And D is₀≤D₂≤3.5D₀. Multiple tests prove that after all the parameters meet the relationship, the reduction range of the cogging torque, the torque fluctuation and the like of the motor is large, the vibration noise of the motor can be reduced more remarkably, and the motor can run more stably.

Preferably, the test proves that when D₁＝0.845D₀And D is₂＝1.355D₀In the process, parameters in the figures tend to be close to the optimal solution, the reduction range of the cogging torque and the torque fluctuation of the motor is large, and the vibration noise of the motor can be reduced more remarkably, so that the motor runs more stably.

In some embodiments, a household appliance is further included, the household appliance comprising the motor in any of the above embodiments, and the household appliance has the advantages of the motor in any of the above embodiments. For example, the home appliance may be a washing machine, an electric fan, an air conditioner, and the like.

In some embodiments, a garden tool is further included, the garden tool comprising the motor in any of the above embodiments, the garden tool having the benefits of the motor in any of the above embodiments. For example, the garden tool may be a lawn mower or the like.

In some embodiments, a vehicle is also included, the vehicle comprising the motor of any of the above embodiments, the vehicle having the benefits of the motor of any of the above embodiments. For example, the vehicle may be an electric vehicle or the like.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A rotor, comprising:

a rotor core;

2. The rotor of claim 1, wherein the rotor yoke portion is removably coupled to the rotor tooth portion.

3. The rotor of claim 2, wherein the rotor yoke portion is clamped to the rotor teeth.

4. The rotor of claim 3, wherein the rotor yoke portion comprises a rotor yoke portion body and a plurality of protruding members, the plurality of protruding members are uniformly connected to the outer side of the rotor yoke portion body along a circumferential direction, the rotor teeth portion is provided with clamping grooves, and the protruding members are clamped in the clamping grooves.

5. The rotor according to claim 4, wherein the protrusion includes a first section and a second section distributed in a radial direction of the rotor core, the second section being connected to an end of the first section, and a width of the second section in a direction perpendicular to the radial direction of the rotor core is gradually increased in the radial direction of the rotor core.

6. The rotor of claim 4, wherein a magnetic steel slot is defined between adjacent rotor teeth, and magnetic steel is arranged in the magnetic steel slot;

7. The rotor of claim 6, wherein a groove is defined between the first boss and the second boss, a preload member is provided on a groove wall of the groove, the preload member is located outside the first boss and the second boss in a radial direction of the rotor core, and the first end abuts against the preload member.

8. The rotor of claim 7, wherein a plurality of the preload members are disposed between the first boss and the second boss and/or a plurality of the preload members are disposed between the first boss and the second boss and extend in an axial direction of the rotor yoke, and the first end abuts against the plurality of the preload members.

9. An electrical machine comprising a rotor according to any one of claims 1 to 8.

10. The electric machine according to claim 9, wherein an end surface of the rotor tooth portion that is remote from the rotor yoke portion is a first arc surface, a center of a circle of the first arc surface is a first center of a circle, and a trajectory of the first centers of the plurality of rotor tooth portions forms a circle centered on a center of the rotor core.

11. The electric machine of claim 10, further comprising a stator core, wherein the rotor core is disposed inside the stator core, wherein the stator core comprises stator teeth, wherein pole shoes are formed on ends of the stator teeth close to the rotor core, and wherein end faces of the pole shoes close to the rotor core are second cambered surfaces protruding towards the rotor core.

12. The electric machine of claim 11, wherein an equivalent circle tangent to the first arc surface is formed with a center of the rotor core as a second center, and the diameter of the equivalent circle is D₀The diameter of the first cambered surface is D₁The diameter of the second cambered surface is D₂，0.5D₀≤D₁＜D₀，D₀≤D₂≤3.5D₀。

13. Household appliance, characterized in that it comprises an electric machine according to any one of claims 9 to 12.

14. Gardening tool, characterized in that it comprises a motor according to any of claims 9 to 12.

15. Vehicle, characterized in that it comprises an electric machine according to any one of claims 9 to 12.