Permanent magnet brushless motor and washing machine

Abstract

The present application relates to the technical field of washing machines, and specifically discloses a permanent magnet brushless motor and a washing machine. The permanent magnet brushless motor comprises a rotor iron core, a stator iron core, and a plug-in assembly; the stator iron core is sleeved on the rotor iron core; the rotor iron core is provided with permanent magnets at intervals in the circumferential direction; the stator iron core is provided with windings at intervals in the circumferential direction; the plug-in assembly is connected to the windings so as to energize the windings; the stator iron core has a plurality of mounting portions; each mounting portion protrudes from the outer side wall of the stator iron core in a direction moving away from the rotor iron core; the outer side wall of the stator iron core comprises straight-line portions and arc-shaped portions; each arc-shaped portion is connected between a mounting portion and a straight-line portion. By adjusting the shape of the outer side wall of the stator iron core, the outer side wall of the stator iron core can adapt to the path of magnetic induction lines, and the magnetic induction lines will not extend to the mounting portions so as to prevent components such as screws at the mounting portion from interfering with the magnetic induction lines; in addition, compared with conventional stator iron core structures, the stator iron core in the present application uses less material, thereby achieving weight reduction.

Description

Permanent magnet brushless motor and washing machine Technical Field

[0001] This application relates to the field of washing machine technology, and in particular to a permanent magnet brushless motor and a washing machine. Background Technology

[0002] With the introduction of new energy consumption standards and the increasing demands for lightweight machines, innovation in washing machine motors is urgently needed. Currently, three-phase permanent magnet synchronous motors have significant advantages in washing machine applications. To maintain this advantage in the competitive market, manufacturers need to continuously optimize the performance of three-phase permanent magnet synchronous motors.

[0003] In the production process, stator laminations or rotor laminations are processed using stamping technology. Due to the large quantity, from an economic perspective, designing a reasonable shape to save materials to the greatest extent is one of the research directions. The biggest problem currently encountered is to design a motor with both structure and weight that meet the requirements without affecting the magnetic flux. However, due to limitations such as magnetic flux area requirements, structural strength, and installation requirements, it is difficult to meet the requirements for stator structure design.

[0004] Summary of the Invention

[0005] Therefore, it is necessary to provide a permanent magnet brushless motor and a washing machine to address the above problems.

[0006] According to a first aspect of the embodiments of this application, a permanent magnet brushless motor is provided, including a rotor core, a stator core, and a plug-in assembly. The stator core is sleeved on the outside of the rotor core. At least one permanent magnet is arranged at intervals along the circumference of the rotor core. At least one winding is arranged at intervals along the circumference of the stator core. The plug-in assembly connects each winding to energize each winding.

[0007] The stator core has a body portion and several mounting portions. Each mounting portion protrudes from the outer side wall of the body portion in a direction away from the rotor core. The outer side wall of the body portion includes a straight portion and an arc-shaped portion. The arc-shaped portion connects the mounting portion and the straight portion. The maximum distance of the arc-shaped portion from the center point of the rotor core is less than or equal to the minimum distance of the locking portion on the mounting portion from the center point of the rotor core in the radial direction.

[0008] In one embodiment, when the winding is energized, it generates magnetic induction lines distributed within the stator core, and the curvature of the arc portion is adapted to the trajectory of the outermost magnetic induction line located within the stator core.

[0009] In one of the embodiments, the thickness of the arc-shaped portion is greater than the thickness of the straight portion, the thickness of the arc-shaped portion being the distance from the outer sidewall to the inner sidewall of the stator core at the arc-shaped portion, and the thickness of the straight portion being the distance from the outer sidewall to the inner sidewall of the stator core at the straight portion.

[0010] In one of the embodiments, the ratio between the thickness of the arc-shaped portion and the thickness of the straight portion is between 1.58 and 1.6.

[0011] In one of the embodiments, the inner wall of the stator core is provided with a plurality of winding slots in the circumferential direction, and each two adjacent winding slots form a stator tooth, and the winding is wound around the periphery of the stator tooth and accommodated in the winding slot.

[0012] In one of the embodiments, the stator tooth comprises a tooth portion and a pole shoe portion, one end of the tooth portion is connected to the inner wall of the stator core, the other end of the tooth portion is connected to the pole shoe portion, and the width of the pole shoe portion in the circumferential direction of the stator core is greater than the width of the tooth portion in the circumferential direction of the stator core.

[0013] In one of the embodiments, the stator tooth is in the shape of T.

[0014] In one of the embodiments, the stator core comprises a plurality of stator laminations stacked in the axial direction, and each stator lamination is stacked at a preset horizontal rotation angle.

[0015] In one of the embodiments, each stator lamination has a riveting structure, and two adjacent stator laminations are connected by the riveting structure.

[0016] In one of the embodiments, the rotor core is provided with a magnetic steel slot for placing the permanent magnet at intervals in the circumferential direction, and a magnetic isolation area is formed between each magnetic steel slot.

[0017] In one of the embodiments, the rotor core comprises a plurality of first rotor laminations and second rotor laminations stacked in the axial direction, the outermost edge of the magnetic steel slot in the radial direction of the first rotor lamination has a magnetic isolation slot, the magnetic isolation slot is communicated with the magnetic steel slot, the outermost edge of the magnetic steel slot in the radial direction of the second rotor lamination has a magnetic isolation bridge, and the magnetic isolation bridge connects the magnetic isolation areas on both sides of the magnetic steel slot.

[0018] In one of the embodiments, in the axial direction of the rotor core, the orthogonal projection of the magnetic isolation bridge on the magnetic isolation slot falls within the magnetic isolation slot.

[0019] In one of the embodiments, in the radial direction of the rotor core, the outermost edge of the magnetic isolation bridge coincides with the outermost edge of the magnetic isolation slot.

[0020] In one of the embodiments, the thickness of the magnetic isolation bridge in the radial direction is between 0.4mm and 0.6mm.

[0021] In one of the embodiments, the ratio of the outer edge slot caliber of the magnetic steel slot to the outer edge slot caliber of the magnetic isolation slot is between 1.57 and 1.61.

[0022] In one of the embodiments, a plurality of the first rotor punching sheets are stacked between two adjacent second rotor punching sheets.

[0023] In one of the embodiments, the first rotor punching sheet and the second rotor punching sheet are stacked at a preset horizontal rotation angle.

[0024] In one of the embodiments, riveting structures are arranged on the first rotor punching sheet and the second rotor punching sheet, and the first rotor punching sheets or the first rotor punching sheet and the second rotor punching sheet are connected through the riveting structures.

[0025] In one of the embodiments, a protruding part is arranged at the innermost edge of the magnetic steel slot in the radial direction of the second rotor punching sheet, and the protruding part protrudes towards the inside of the magnetic steel slot. When the permanent magnet is inserted into the magnetic steel slot along the axial direction of the rotor core, the protruding part is bent by the permanent magnet, so that the protruding part applies a radial abutting force to the permanent magnet.

[0026] In one of the embodiments, the permanent magnet brushless motor further comprises a front end cover and a rear end cover, and the front end cover and the rear end cover are connected to the two sides of the stator core through the mounting parts.

[0027] In one of the embodiments, the front end cover and the rear end cover are made of aluminum alloy.

[0028] According to the second aspect of the embodiments of the present application, a washing machine is provided, which comprises the above-mentioned permanent magnet brushless motor.

[0029] The permanent magnet brushless motor and the washing machine provided by the embodiments of the present application have the following advantages. The mounting parts of the stator core protrude outward from the outer side wall of the body part of the stator core in the direction away from the rotor core. The outer side wall of the body part of the stator core comprises a straight part and an arc part, and the arc part is connected between the mounting part and the straight part. The maximum distance of the arc part from the center point of the rotor core is less than or equal to the minimum distance of the locking part on the mounting part from the center point of the rotor core in the radial direction. That is, by adjusting the shape of the outer side wall of the stator core, the outer side wall of the stator core can adapt to the direction of the magnetic induction lines, and the magnetic induction lines will not expand to the mounting part to avoid the interference of the screws and other components at the mounting part on the magnetic induction lines. Meanwhile, compared with the traditional structure of the stator core, the stator core in the present application uses less material, thereby achieving weight reduction. BRIEF DESCRIPTION OF DRAWINGS

[0030] Fig. 1 is a structural schematic diagram of a permanent magnet brushless motor according to an embodiment of the present application;

[0031] Fig. 2 is a sectional view of the permanent magnet brushless motor according to an embodiment of the present application;

[0032] Fig. 3 is a structural schematic diagram of a stator core in the permanent magnet brushless motor according to an embodiment of the present application;

[0033] Fig. 4 is a magnetic induction line distribution diagram corresponding to the permanent magnet brushless motor in the prior art;

[0034] Fig. 5 is a magnetic induction line distribution diagram corresponding to the permanent magnet brushless motor according to an embodiment of the present application;

[0035] Fig. 6 is a perspective structural diagram of the stator core in the permanent magnet brushless motor according to an embodiment of the present application;

[0036] Fig. 7 is a structural schematic diagram of a riveting structure in the permanent magnet brushless motor according to an embodiment of the present application;

[0037] Fig. 8 is a structural schematic diagram of the riveting structure in the permanent magnet brushless motor according to an embodiment of the present application;

[0038] Fig. 9 is a perspective structural schematic diagram of a rotor core in the permanent magnet brushless motor according to an embodiment of the present application;

[0039] Fig. 10 is a structural schematic diagram of a first rotor lamination in the permanent magnet brushless motor according to an embodiment of the present application;

[0040] Fig. 11 is a structural schematic diagram of a second rotor lamination in the permanent magnet brushless motor according to an embodiment of the present application;

[0041] Fig. 12 is a perspective structural schematic diagram of the rotor core in the permanent magnet brushless motor according to an embodiment of the present application.

[0042] BRIEF DESCRIPTION OF DRAWINGS

[0043] 100, rotor core; 110, magnetic steel slot; 120, magnetic isolation area; 130, first rotor lamination; 131, magnetic isolation slot; 140, second rotor lamination; 141, magnetic isolation bridge; 142, protruding part; 200, stator core; 211, mounting part; 212, straight part; 213, arc part; 220, winding slot; 230, stator tooth; 231, tooth part; 232, pole shoe part; 240, stator lamination; 250, riveting structure; 251, protruding part; 252, slot body; 300, permanent magnet; 400, winding; 500, magnetic induction line; 600, front end cover; 700, rear end cover. DETAILED DESCRIPTION

[0044] For the purpose of clarity, the present application will be described in greater detail below with reference to the accompanying drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be realized in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the application to those skilled in the art.

[0045] In the present application, unless otherwise clearly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] The terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise clearly specified and limited.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the specification of the present application is only for the purpose of describing specific embodiments and is not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0048] Referring to FIGS. 1, 2, 6 and 9, in one embodiment, a permanent magnet brushless motor is provided, comprising a rotor core 100, a stator core 200 and a plug-in assembly, the stator core 200 is sleeved on the outside of the rotor core 100, a plurality of permanent magnets 300 are arranged on the rotor core 100 at intervals in the circumferential direction, a plurality of windings 400 are arranged on the stator core 200 at intervals in the circumferential direction, and the plug-in assembly is connected to each winding 400 to energize each winding 400.

[0049] The plug-in assembly can be connected to an external control component, the external control component can provide three-phase alternating current, the three-phase alternating current is provided to the winding 400 through the plug-in assembly, and then a stator rotating magnetic field is generated. The rotor core 100 relies on the permanent magnet 300 to form a rotor magnetic field, and the two magnetic fields are coupled to make the motor rotate, that is, the rotor core 100 rotates at high speed relative to the stator core 200.

[0050] Referring to FIG. 3, the stator core 200 has a body portion and a plurality of mounting portions 211 connected to the body portion. Each mounting portion 211 protrudes outward from the outer side wall of the body portion of the stator core 200 in a direction away from the rotor core 100. The outer side wall of the body portion of the stator core 200 includes a straight portion 212 and an arc-shaped portion 213. The arc-shaped portion 213 is connected between the mounting portion 211 and the straight portion 212.

[0051] The mounting portion 211 of the stator core 200 is mainly used for mounting and fixing the stator core 200. Specifically, the stator core 200 can be connected to a corresponding end cover through the mounting portion 211.

[0052] In the conventional technology, the profile of the stator core 200 is generally rectangular. The mounting portion 211 is located at the four corners of the rectangular stator core 200. This design has the following disadvantages: heavy weight and high cost. Referring to FIG. 4, the magnetic induction lines 500 generated after the winding 400 is energized will extend to the mounting portion 211. Since the mounting portion 211 is usually provided with a screw or the like locking portion, it will interfere with the magnetic induction lines 500, thereby causing the magnetic induction lines 500 to be unevenly distributed and interfere with other magnetic induction lines 500.

[0053] In the present application, each mounting portion 211 protrudes outwardly from the outer wall of the main portion of the stator core 200 in a direction away from the rotor core 100, that is, the two sides of the mounting portion 211 in the prior art are chamfered, thereby reducing the weight of the stator core 200 and lowering the cost. Referring to FIG. 5, the maximum distance of the arc-shaped portion 213 from the center point of the rotor core 100 is less than or equal to the minimum distance of the locking portion on the mounting portion 211 from the center point of the rotor core 100, thereby ensuring that the magnetic induction lines 500 generated after the winding 400 is energized do not extend to the mounting portion 211, thereby avoiding the influence of the screws and other components at the mounting portion 211 on the magnetic induction lines 500 and avoiding uneven magnetic induction lines 500. In the present application, the outer wall of the stator core 200 is shaped as a straight portion 212 and an arc-shaped portion 213, which is connected between the mounting portion 211 and the straight portion 212, thereby adapting the shape of the outer wall of the stator core 200 to the direction of the magnetic induction lines 500 to maximize the amount of magnetic induction lines 500. In the above scheme, a linear segment region can also be provided between the mounting portion 211 and the straight portion 212, for example, a linear segment region is provided at the connection between the arc-shaped portion 213 and the mounting portion 211, which can more smoothly connect the chamfering process. This is not an absolute limitation.

[0054] In the present embodiment, the curvature of the arc-shaped portion 213 is adapted to the trajectory of the outermost magnetic induction lines 500 in the stator core 200 to further maximize the passage of the magnetic induction lines 500.

[0055] In one embodiment, the stator core 200 can have four mounting portions 211, which are respectively distributed at the four corners of the stator core 200. In other embodiments, the stator core 200 can also have two or three mounting portions 211, etc., and the number of mounting portions 211 can be set according to actual needs, which is not an absolute limitation.

[0056] Referring to FIG. 3, in the present embodiment, the thickness of the arc-shaped portion 213 is greater than the thickness of the straight portion 212, wherein the thickness of the arc-shaped portion 213 is the distance D from the outer wall to the inner wall of the stator core 200 at the arc-shaped portion 213, and the thickness of the straight portion 212 is the distance E from the outer wall to the inner wall of the stator core 200 at the straight portion 212. After the mounting portion 211 is chamfered, the magnetic induction lines 500 that can originally extend to the mounting portion 211 cannot pass through the arc-shaped portion 213, but since the thickness of the arc-shaped portion 213 is greater than the thickness of the straight portion 212 in the present embodiment, the magnetic induction parameters that pass through the arc-shaped portion 213 still meet the requirements, effectively ensuring the magnetic flux and improving the performance of the motor.

[0057] In one embodiment, the ratio between the thickness of the arc-shaped portion 213 and the thickness of the straight portion 212 is between 1.58 and 1.6. Specifically, it can be 1.58, 1.59 or 1.6, etc. The ratio between the thickness of the arc-shaped portion 213 and the thickness of the straight portion 212 is set to be between 1.58 and 1.6. With the above setting, the magnetic induction lines 500 are relatively dense at the straight portion 212 and relatively sparse at the arc-shaped portion 213, so a relatively thicker arc-shaped portion 213 is needed to ensure the magnetic flux and thus the performance of the motor will not be reduced. In addition, the arc-shaped portion 213 obtained by chamfering can better reflect the advantages of weight reduction and material loss reduction in the structure of the stator core 200 with multiple stator laminations 240.

[0058] The performance of the motor can be ensured without reducing the magnetic flux.

[0059] In one embodiment, the inner wall of the stator core 200 is circumferentially provided with multiple winding grooves 220, and adjacent two winding grooves 220 form a stator tooth 230. The winding 400 is wound around the periphery of the stator tooth 230 and accommodated in the winding groove 220.

[0060] Each stator tooth 230 can have the same tooth width, which refers to the width of the stator tooth 230 along the circumference of the stator core 200. The stator tooth 230 provides a winding position for the winding 400, and the winding 400 is wound around the periphery of the stator tooth 230 and accommodated by the winding grooves 220 on both sides of the stator tooth 230.

[0061] In this embodiment, the stator tooth 230 includes a tooth portion 231 and a pole shoe portion 232. One end of the tooth portion 231 is connected to the inner wall of the stator core 200, and the other end of the tooth portion 231 is connected to the pole shoe portion 232. The width of the pole shoe portion 232 in the circumferential direction of the stator core 200 is greater than the width of the tooth portion 231 in the circumferential direction of the stator core 200. Since one end of the tooth portion 231 is connected to the inner wall of the stator core 200 and the other end is connected to the pole shoe portion 232, and the width of the pole shoe portion 232 in the circumferential direction of the stator core 200 is greater than the width of the tooth portion 231 in the circumferential direction of the stator core 200, the winding 400 can be more reliably wound on the stator tooth 230 and is less likely to fall off the stator tooth 230. The pole shoe portions 232 of adjacent two stator teeth 230 are kept a certain distance apart.

[0062] Further, the stator tooth 230 is in the shape of T, the pole shoe portion 232 is the horizontal part of the upper half of the T, and the tooth portion 231 is the vertical part of the lower half of the T.

[0063] In one of the embodiments, referring to FIG. 6, the stator core 200 comprises a plurality of stator laminations 240 stacked along the axial direction, and each of the stator laminations 240 is stacked at a preset horizontal rotation angle. That is, the stator core 200 can be stacked by a plurality of stator laminations 240, and each of the stator laminations 240 can be stacked at a preset horizontal rotation angle during the stacking. In this embodiment, the preset horizontal rotation angle can be 90°.

[0064] In the conventional technology, due to the machining error, the surface of the lamination is often uneven, especially the lamination processed by the production line, and the error is usually concentrated, for example, concentrated in one or more places. If the laminations are stacked at a fixed angle, the surface of the formed stator core 200 can be low on one side and high on the other side. To solve this problem, in this embodiment, each of the stator laminations 240 is stacked at a preset horizontal rotation angle, thereby avoiding the problem of inconsistent surface height of the formed stator core 200 due to stacking the laminations at a fixed angle. Thus, during the rotation of the motor, the balance can be effectively improved, and the high speed and low noise effect can be achieved.

[0065] In one of the embodiments, referring to FIGS. 6-8, each of the stator laminations 240 has a riveting structure 250, and two adjacent stator laminations 240 are connected by the riveting structure 250. Specifically, each of the stator laminations 240 can be provided with a riveting structure 250, which can be a protruding portion 251 and a groove 252 corresponding to the protruding portion 251, that is, the protruding portion 251 and the groove 252 are distributed on both sides of the stator lamination 240. When two stator laminations 240 are stacked, the protruding portion 251 of one of the stator laminations 240 is riveted in the groove 252 of the other stator lamination 240, and the plurality of stator laminations 240 can be stacked together by the riveting structure 250 to form the stator core 200, thereby ensuring the tightness and stability of the formed stator core 200.

[0066] In one of the embodiments, the riveting structure 250 on the same stator lamination 240 can have a plurality of riveting structures 250, and the riveting structures 250 are uniformly distributed around the axial direction.

[0067] In one of the embodiments, the rotor core 100 is provided with a plurality of magnetic steel grooves 110 for placing the permanent magnets 300 at intervals in the circumferential direction, and a magnetic separation area 120 is formed between each of the magnetic steel grooves 110. In actual application, eight magnetic steel grooves 110 can be provided on the rotor core 100, and the eight magnetic steel grooves 110 are uniformly distributed at intervals in the circumferential direction of the rotor core 100.

[0068] In one of the embodiments, referring to FIG. 9, the rotor core 100 comprises a plurality of first rotor sheets 130 and second rotor sheets 140 which are stacked in sequence along the axial direction. In this embodiment, the rotor core 100 can be formed by alternately stacking the first rotor sheets 130 and the second rotor sheets 140. Specifically, a plurality of the first rotor sheets 130 can be stacked between any two adjacent second rotor sheets 140, i.e., a plurality of the first rotor sheets 130 are stacked before a second rotor sheet 140 is stacked.

[0069] Referring to FIGS. 10 and 11, the outermost edge of the magnetic steel slot 110 in the first rotor sheet 130 in the radial direction has a magnetic isolation slot 131 which is in communication with the magnetic steel slot 110. The outermost edge of the magnetic steel slot 110 in the second rotor sheet 140 in the radial direction has a magnetic isolation bridge 141 which connects the magnetic isolation zones 120 on both sides of the magnetic steel slot 110. The magnetic isolation slot 131 is in an open structure, thereby minimizing the magnetic leakage and improving the electromagnetic utilization rate, and reducing the material consumption and cost.

[0070] In the axial direction of the rotor core 100, the orthogonal projection of the magnetic isolation bridge 141 on the magnetic isolation slot 131 falls within the magnetic isolation slot 131. In the radial direction of the rotor core 100, the outermost edge of the magnetic isolation bridge 141 coincides with the outermost edge of the magnetic isolation slot 131. In one of the embodiments, the thickness of the magnetic isolation bridge 141 in the radial direction is 0.4mm-0.6mm, specifically 0.4mm, 0.5mm or 0.6mm, etc., thereby meeting the structural strength requirement and effectively improving the magnetic flux rate.

[0071] In one of the embodiments, the ratio of the outer edge slot diameter of the magnetic steel slot 110 to the outer edge slot diameter of the magnetic isolation slot 131 is 1.57-1.61, specifically 1.57, 1.58, 1.59, 1.60 or 1.61, etc.

[0072] In this embodiment, the first rotor sheet 130 and the second rotor sheet 140 are stacked at a preset horizontal rotation angle. Similar to the stacking mode of the stator sheet 240, the rotor sheets are also stacked at a preset horizontal rotation angle. Here, the preset horizontal rotation angle can be 90°.

[0073] The first rotor lamination 130 and the second rotor lamination 140 are stacked at a preset horizontal rotation angle, which can avoid the problem of inconsistent surface height of the rotor core 100 after molding due to stacking the rotor laminations at a fixed angle, thereby effectively improving the balance during motor rotation and achieving high speed and low noise.

[0074] The first rotor lamination 130 and the second rotor lamination 140 are both provided with a riveting structure 250, and adjacent first rotor laminations 130 or adjacent first rotor laminations 130 and second rotor laminations 140 are connected through the riveting structure 250. The specific content of the riveting structure 250 can be referred to the previous description, which will not be repeated here.

[0075] In one embodiment, referring to FIG. 12, the innermost edge of the magnetic steel groove 110 in the second rotor lamination 140 in the radial direction is provided with a protruding portion 142, which protrudes towards the inside of the magnetic steel groove 110. When the permanent magnet 300 is inserted into the magnetic steel groove 110 along the axial direction of the rotor core 100, the protruding portion 142 is bent by the permanent magnet 300, so that the protruding portion 142 exerts a radial abutting force on the permanent magnet 300.

[0076] When the permanent magnet 300 is inserted into the magnetic steel groove 110 along the axial direction, the two side walls in the circumferential direction are in clearance fit with the magnetic steel groove 110, and in the radial direction, the outer end of the permanent magnet 300 is limited, and the inner end of the permanent magnet 300 can bend the protruding portion 142, thereby deforming the protruding portion 142, and the protruding portion 142 exerts a radial abutting force on the permanent magnet 300, thereby ensuring that the positions of the plurality of permanent magnets 300 after installation are consistent, and the thrust of the protruding portion 142 can stably fix each permanent magnet 300 at the same position, effectively reducing the micro-deformation of the permanent magnet 300 in the magnetic steel groove 110, and also significantly improving the vibration and high-frequency noise of the motor.

[0077] In one of the embodiments, referring to Fig. 1, the permanent magnet brushless motor further comprises a front end cover 600 and a rear end cover 700, which are connected to two sides of the stator core 200 through the mounting portion 211. The front end cover 600 and the rear end cover 700 are made of aluminum alloy material, which is smaller in size and lighter in weight than the existing end cover, thereby reducing the cost without changing the assembly method and increasing the assembly cost. First of all, it is worth noting that the selection of the above material can also contact the connection mode to conduct the heat on the stator core 200 to the outside, ensuring the heat dissipation efficiency; secondly, it is worth noting that the above mounting mode exposes the side wall of the stator core 200 directly to the air, so that the heat generated can be dissipated to the air without obstruction, further improving the heat dissipation efficiency.

[0078] In one embodiment, a washing machine is provided, which comprises the permanent magnet brushless motor provided in the above embodiments. Specifically, the washing machine has an inner drum, and the permanent magnet brushless motor drives the inner drum to rotate through the output shaft.

[0079] The technical features of the above embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present disclosure.

[0080] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as the limitation of the patent scope. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A permanent magnet brushless motor, characterized by, The application relates to a rotor core, a stator core and a plug-in assembly, the stator core is sleeved outside the rotor core, at least one permanent magnet is arranged on the rotor core in a circumferential direction, at least one winding is arranged on the stator core in a circumferential direction, and the plug-in assembly is connected with each winding to supply electricity to each winding. The stator core has a body part and a plurality of mounting parts, each mounting part protrudes from the outer wall of the body part in a direction away from the rotor core, the outer wall of the body part comprises a straight part and an arc part, the arc part is connected between the mounting part and the straight part, and the maximum distance of the arc part from the center point of the rotor core is less than or equal to the minimum distance of the locking part on the mounting part from the center point of the rotor core in a radial direction.

2. The permanent-magnet brushless motor of claim 1, wherein The winding generates magnetic induction lines distributed in the stator core after being electrified, and the curvature of the arc part is adapted to the track of the outermost magnetic induction line in the stator core.

3. The permanent-magnet brushless electric motor of claim 1, wherein, The thickness of the arc part is greater than the thickness of the straight part, the thickness of the arc part is the distance between the outer wall and the inner wall of the stator core at the arc part, and the thickness of the straight part is the distance between the outer wall and the inner wall of the stator core at the straight part.

4. The permanent-magnet brushless electric motor of claim 3, wherein, The ratio between the thickness of the arc part and the thickness of the straight part is between 1.58 and 1.

6.

5. The permanent-magnet brushless electric motor of claim 1, wherein, The inner wall of the stator core is provided with a plurality of winding grooves in a circumferential direction, and a stator tooth is formed between two adjacent winding grooves, the winding is wound around the periphery of the stator tooth and accommodated in the winding groove.

6. The permanent-magnet brushless electric motor of claim 5, wherein, The stator tooth comprises a tooth part and a pole shoe part, one end of the tooth part is connected to the inner wall of the stator core, the other end of the tooth part is connected to the pole shoe part, and the width of the pole shoe part in the circumferential direction of the stator core is greater than the width of the tooth part in the circumferential direction of the stator core.

7. The permanent-magnet brushless electric motor of claim 5, wherein, The stator tooth is in a T-shaped structure.

8. The permanent magnet brushless motor of claim 1, wherein, The stator core comprises a plurality of stator laminations stacked in an axial direction, and each stator lamination is stacked at a preset horizontal rotation angle.

9. The permanent-magnet brushless electric motor of claim 8, wherein, Each stator lamination has a riveting structure, and two adjacent stator laminations are connected through the riveting structure.

10. The permanent-magnet brushless electric motor of claim 1, wherein, The rotor core is provided with a magnetic steel groove for placing the permanent magnet in a circumferential direction, and a magnetic separation area is formed between the magnetic steel grooves.

11. The permanent-magnet brushless electric motor of claim 10, wherein, The rotor core comprises a plurality of first rotor laminations and second rotor laminations stacked in an axial direction, the outermost edge of the magnetic steel groove in the first rotor lamination in a radial direction has a magnetic separation groove, the magnetic separation groove is communicated with the magnetic steel groove, the outermost edge of the magnetic steel groove in the second rotor lamination in a radial direction has a magnetic separation bridge, and the magnetic separation bridge connects the magnetic separation areas on both sides of the magnetic steel groove.

12. The permanent-magnet brushless electric motor of claim 11, wherein, In the axial direction of the rotor core, the orthogonal projection of the magnetic separation bridge on the magnetic separation groove falls into the magnetic separation groove.

13. The permanent magnet brushless motor of claim 11, wherein, In the radial direction of the rotor core, the outermost edge of the magnetic separation bridge coincides with the outermost edge of the magnetic separation groove.

14. The permanent magnet brushless motor of claim 11, wherein, The thickness of the magnetic separation bridge in the radial direction is between 0.4mm and 0.6mm.

15. The permanent magnet brushless motor of claim 11, wherein, The ratio of the outer edge groove caliber of the magnetic steel groove to the outer edge groove caliber of the magnetic separation groove is between 1.57 and 1.

61.

16. The permanent magnet brushless motor of claim 11, wherein, A plurality of the first rotor laminations are stacked between two adjacent second rotor laminations.

17. The permanent magnet brushless motor of claim 11, wherein, The first rotor laminations and the second rotor laminations are stacked at a preset horizontal rotation angle.

18. The permanent magnet brushless motor of claim 11, wherein, The first rotor laminations and the second rotor laminations are each provided with a riveting structure, and adjacent first rotor laminations or adjacent first rotor laminations and second rotor laminations are connected through the riveting structure.

19. The permanent magnet brushless motor of claim 11, wherein, A protruding portion is arranged on the innermost edge of the magnetic steel slot in the radial direction, and the protruding portion protrudes towards the inside of the magnetic steel slot. When the permanent magnet is inserted into the magnetic steel slot along the axial direction of the rotor core, the protruding portion is bent by the permanent magnet, so that the protruding portion exerts a radial abutting force on the permanent magnet.

20. The permanent magnet brushless motor of claim 1, wherein, The permanent magnet brushless motor further comprises a front end cover and a rear end cover, and the front end cover and the rear end cover are connected to the two sides of the stator core through the mounting portions respectively.

21. The permanent magnet brushless motor of claim 20, wherein, The front end cover and the rear end cover are made of aluminum alloy.

22. A laundry machine characterized by The permanent magnet brushless motor comprises the permanent magnet brushless motor according to any one of claims 1-21.

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