Stator core, stator assembly, motor and electrical equipment

Abstract

The utility model discloses a stator core, a stator assembly, a motor and electrical equipment. The stator core includes: a stator yoke; each stator tooth comprises a tooth part and a tooth boot, the tooth part extends along the radial direction of the stator yoke part, two radial ends of the tooth part are respectively connected with the stator yoke part and the tooth boot, the inner circumferential surface or the outer circumferential surface of the stator yoke part is provided with a plurality of first slots, and the plurality of first slots are arranged at intervals along the circumferential direction of the stator yoke part; a first inserting part is arranged at one end of the tooth part, and the first inserting part is inserted into the first inserting groove; and / or, the tooth boot is provided with a second slot, and the other end of the tooth part is provided with a second inserting part which is inserted into the second slot. According to the stator core provided by the embodiment of the utility model, the stator winding and the stator core are easier to assemble, the assembly efficiency is improved, and the slot fullness rate of the stator winding in the stator slot can be higher, so that the improvement of the torque density and the motor operation efficiency is facilitated, and the motor performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of stators, and more specifically, to a stator core, a stator assembly, a motor and an electrical device. Background Art

[0002] In the related art, the slot fill rate of the stator assembly is low, which affects the torque density and the improvement of the motor operating efficiency, resulting in the motor performance failing to meet the requirements. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the utility model is to provide a stator core, wherein the stator core improves torque density and operating efficiency.

[0004] The utility model also provides a stator assembly having the stator core.

[0005] The utility model also provides a motor with the stator assembly.

[0006] The utility model also provides an electrical device having the motor.

[0007] According to the stator core of the embodiment of the utility model, it includes: a stator yoke; a plurality of stator teeth, wherein the stator teeth include tooth portions and tooth shoes, the tooth portions extend radially along the stator yoke, and the radial ends of the tooth portions are respectively connected to the stator yoke and the tooth shoes, wherein the inner circumference or outer circumference of the stator yoke is provided with a plurality of first slots, the plurality of first slots are arranged at intervals along the circumference of the stator yoke, one end of the tooth portion is provided with a first plug-in portion, and the first plug-in portion is inserted into the first slot; and / or the tooth shoe is provided with a second slot, the other end of the tooth portion is provided with a second plug-in portion, and the second plug-in portion is inserted into the second slot.

[0008] According to the stator core of the embodiment of the utility model, at least one of the stator yoke and the tooth shoe is connected to the tooth part through a slot and a plug-in part, so that the stator winding and the stator core are easier to assemble, and the assembly efficiency is improved. The slot fill rate of the stator winding in the stator slot can be higher, which is beneficial to improve the torque density and the operating efficiency of the motor and improve the motor performance.

[0009] In addition, the stator core according to the above embodiment of the utility model may also have the following additional technical features:

[0010] According to some embodiments of the present invention, the shape of the first slot matches the shape of the first plug-in portion, and the outer surface of the first plug-in portion has a clearance fit, a transition fit, or an interference fit with the slot wall of the first slot.

[0011] According to some embodiments of the utility model, the size of the first plug-in portion along the circumference of the stator yoke is equal to the size of the tooth portion along the circumference of the stator yoke; or, the first plug-in portion is provided with a first limiting recess on at least one side surface of the circumference of the stator yoke and one of the side walls of the first slot, and the other is provided with a first limiting protrusion embedded in the first limiting recess; or, the size of the first plug-in portion along the circumference of the stator yoke decreases in the direction away from the tooth shoe.

[0012] According to some embodiments of the present invention, the shape of the second slot matches the shape of the second plug-in portion, and the outer surface of the second plug-in portion has a clearance fit, a transition fit, or an interference fit with the slot wall surface of the second slot.

[0013] According to some embodiments of the utility model, the size of the second plug-in portion along the circumference of the stator yoke is equal to the size of the tooth portion along the circumference of the stator yoke; or, the second plug-in portion is provided with a second limiting recess on at least one side surface of the circumference of the stator yoke and one of the side walls of the second slot, and the other is provided with a second limiting protrusion embedded in the second limiting recess; or, the size of the second plug-in portion along the circumference of the stator yoke decreases in the direction away from the stator yoke.

[0014] According to some embodiments of the utility model, the stator yoke includes a yoke body and a plurality of yoke protrusions, the yoke body is an annular structure, the plurality of yoke protrusions are arranged at intervals along the circumference of the yoke body, the first slot is defined between two adjacent yoke protrusions, the maximum radial dimension of the stator yoke is d1, the radial thickness of the yoke body is d2, and d1 / d2 is greater than 1 and less than or equal to 9.5.

[0015] According to some embodiments of the utility model, the stator yoke includes a yoke body and a plurality of yoke protrusions, the yoke body is an annular structure, the plurality of yoke protrusions are arranged at intervals along the circumference of the yoke body, the first slot is defined between two adjacent yoke protrusions, the dimension of the end of the yoke protrusion close to the yoke body along the circumference of the stator yoke is W1, the dimension of the end of the yoke protrusion away from the yoke body along the circumference of the stator yoke is W2, and W2 / W1 is greater than or equal to 0.5 and less than or equal to 11.5.

[0016] According to some embodiments of the present invention, an outer diameter D1 of the stator core and an inner diameter D2 of the stator core satisfy: D1 / D2 is greater than 1.5 and less than 19.

[0017] According to some embodiments of the present invention, the dimensions of the teeth along the circumference of the stator core are equal everywhere.

[0018] According to some embodiments of the present invention, the tooth portion is made of oriented silicon steel, and the orientation direction is parallel to the radial direction of the tooth portion.

[0019] According to some embodiments of the present invention, the stator yoke is made of non-oriented silicon steel, a solid magnetic conductive component or a metal soft magnetic composite material.

[0020] According to some embodiments of the utility model, a side surface of the tooth shoe facing the tooth portion extends perpendicularly to the radial direction of the stator yoke portion; or, a side surface of the tooth shoe facing the tooth portion is an arc-shaped surface, and a central axis of the arc-shaped surface coincides with an axis of the stator yoke portion.

[0021] The stator assembly according to the embodiment of the present invention comprises a stator winding and a stator core according to the embodiment of the present invention, wherein the stator winding is wound around the tooth portion.

[0022] According to some embodiments of the present invention, the stator assembly includes a plastic-encapsulating body, wherein the plastic-encapsulating body encapsulates the stator core and the stator winding.

[0023] The motor according to the embodiment of the present invention comprises a rotor assembly and a stator assembly according to the embodiment of the present invention.

[0024] According to some embodiments of the present invention, the number of poles Np of the rotor assembly is greater than 2 and less than 30; the number of teeth Ns of the stator teeth is greater than 3 and less than 30; and the absolute value of Ns-Np is greater than or equal to 1 and less than or equal to 6.

[0025] The electrical device according to the embodiment of the utility model includes the motor according to the embodiment of the utility model.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0028] Figure 1 is a schematic structural diagram of a stator core according to a first embodiment of the utility model;

[0029] Figure 2 yes Figure 1 A schematic diagram of the structure of the middle stator yoke;

[0030] Figure 3 yes Figure 1 A schematic diagram of the structure of multiple stator teeth;

[0031] Figure 4yes Figure 1 Schematic diagram of the structure of a stator tooth;

[0032] Figure 5 There are two Figure 1 Schematic diagram of the arrangement of stator teeth of the stator core during the production process;

[0033] Figure 6 is a schematic structural diagram of a stator tooth according to a second embodiment of the utility model;

[0034] Figure 7 is a schematic structural diagram of a stator core according to a third embodiment of the utility model;

[0035] Figure 8 yes Figure 7 A schematic diagram of the structure of the middle stator yoke;

[0036] Fig. 9 yes Figure 7 Schematic diagram of the structure of a stator tooth;

[0037] Fig.10 is a schematic structural diagram of a stator core according to a fourth embodiment of the utility model;

[0038] Fig.11 yes Fig.10 A schematic diagram of the structure of the middle stator yoke;

[0039] Fig.12 yes Fig.10 Schematic diagram of the structure of a stator tooth;

[0040] Fig.13 is a schematic structural diagram of a stator core according to a fifth embodiment of the utility model;

[0041] Fig.14 yes Fig.13 A schematic diagram of the structure of the middle stator yoke;

[0042] Fig.15 yes Fig.13 Schematic diagram of the structure of a stator tooth.

[0043] Reference numerals:

[0044] Stator core 100;

[0045] Stator yoke 10; first slot 101; yoke body 11; yoke protrusion 12;

[0046] stator tooth 20 ; tooth portion 21 ; first plug-in portion 211 ; second plug-in portion 212 ; tooth shoe 22 ; second slot 221 ; first position-limiting recess 23 ; first position-limiting protrusion 24 . DETAILED DESCRIPTION

[0047] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0049] In the description of the present invention, "first feature" and "second feature" may include one or more such features, "plurality" means two or more, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them, the first feature "above", "above" and "above" the second feature may include the first feature being directly above and diagonally above the second feature, or may simply mean that the first feature is at a higher level than the second feature.

[0050] In the related art, the stator core of the stator assembly is an integrated structure. When the stator winding is assembled with the stator core, the stator winding needs to be radially installed into the stator slot through the stator slot opening. In order to achieve stable installation and positioning of the stator winding on the stator core, the stator core has a tooth boot to limit the stator winding into the stator slot. The tooth boot is set so that the opening size of the stator slot along the circumference of the stator core is smaller than the size in the stator slot. It is inconvenient to install the stator winding into the stator slot, and the size of the stator winding cannot be too large. This leads to a low slot fill rate in the stator slot, and then a low torque density and motor operating efficiency, which greatly affects the motor manufacturing efficiency and performance.

[0051] Based on this, the present application proposes a stator core 100, which is connected to the tooth portion 21 through a slot and a plug-in portion through at least one of the stator yoke 10 and the tooth shoe 22, so that the stator winding and the stator core 100 are easier to assemble, the assembly efficiency is improved, and the slot fill rate of the stator winding in the stator slot can be higher, which is beneficial to improve the torque density and motor operating efficiency, and improve the motor performance.

[0052] The stator core 100 , the stator winding and the motor according to the embodiments of the present invention are described below with reference to the accompanying drawings.

[0053] Reference Figure 1-Figure 4 As shown, the stator core 100 according to the embodiment of the present invention may include: a stator yoke 10 and a plurality of stator teeth 20 .

[0054] Specifically, the stator tooth 20 includes a tooth portion 21 and a tooth shoe 22. The tooth portion 21 extends radially along the stator yoke 10, and radial ends of the tooth portion 21 are respectively connected to the stator yoke 10 and the tooth shoe 22. A plurality of stator teeth 20 can be arranged along the circumferential direction of the stator yoke 10, so that a stator slot is defined between two adjacent stator teeth 20.

[0055] The stator assembly according to the embodiment of the utility model includes a stator winding and a stator core 100 according to the embodiment of the utility model, and the stator winding is wound on the tooth portion 21. Thus, the stator winding can be installed on the stator core 100, and part of the stator winding is located in the stator slot, and the stator yoke 10 and the tooth shoe 22 can limit the stator winding from both radial sides of the tooth portion 21, so that the stator winding and the stator core 100 installation structure are stable.

[0056] The motor according to the embodiment of the utility model comprises a rotor assembly and a stator assembly according to the embodiment of the utility model. The rotor assembly is arranged around the stator assembly or the stator assembly is arranged around the rotor assembly, so that the motor is formed into an inner rotor motor or an outer rotor motor. The stator assembly cooperates with the rotor assembly to rotate the rotor assembly to realize the operation of the motor.

[0057] In addition, in some embodiments of the present application, continue to refer to Figure 1-Figure 4 As shown, the inner circumference or outer circumference of the stator yoke 10 is provided with a plurality of first slots 101 , and the plurality of first slots 101 are arranged at intervals along the circumference of the stator yoke 10 . A first plug-in portion 211 is provided at one end of the tooth portion 21 and the first plug-in portion 211 is inserted into the first slot 101 .

[0058] Among them, in the embodiment where the inner circumference of the stator yoke 10 is provided with a plurality of first slots 101, the radial outer end of the tooth portion 21 is plugged with the stator yoke 10 through the first plug-in portion 211, and the radial inner end of the tooth portion 21 is connected to the tooth shoe 22. The plurality of tooth shoes 22 define a stator hole for accommodating the rotor assembly, and the motor including the above-mentioned stator core 100 is an inner rotor motor. In the embodiment where the outer circumference of the stator yoke 10 is provided with a plurality of first slots 101, the radial inner end of the tooth portion 21 is plugged with the stator yoke 10 through the first plug-in portion 211, and the radial outer end of the tooth portion 21 is connected to the tooth shoe 22. The rotor assembly can be sleeved outside the stator assembly including the above-mentioned stator core 100, so that the motor is formed as an outer rotor motor.

[0059] During the assembly of the stator assembly, the stator winding can be first sleeved on the tooth portion 21 of the stator tooth 20, and then the multiple stator teeth 20 can be plugged and connected to the stator yoke 10 through the first slot 101 and the first plug-in portion 211. When installing the stator winding, since the multiple stator teeth 20 are separated from each other, the installation of the stator winding is not interfered with by adjacent stator teeth 20, nor is it limited by the size of the stator slot. The cross-sectional size of the stator winding can be larger without affecting the installation, and after the stator teeth 20 and the stator yoke 10 are assembled, the position of the stator winding in the stator slot can be flexibly adjusted, so that the stator winding can occupy as much space in the stator slot as possible, improve the slot fill rate, and then improve the torque density and motor operating efficiency, and improve the motor performance. In addition, the assembly of the stator assembly is easier, which greatly improves the manufacturing efficiency.

[0060] In addition, when the plurality of stator teeth 20 are separated from each other, it is also beneficial to improve production efficiency and material utilization rate in the process of manufacturing the stator teeth 20. Specifically, the stator teeth 20 can be formed by stacking a plurality of tooth punching sheets in the thickness direction, the tooth punching sheets are formed by a stamping process, and the tooth portion 21 and the tooth shoe 22 of the stator tooth 20 are generally formed into a T-shaped structure. Figure 5 As shown, upright T-shaped tooth punches and inverted T-shaped tooth punches can be punched out on a large-area plate, so that a larger number of tooth punches can be processed per unit area of ​​the plate, thereby improving material utilization.

[0061] In other embodiments of the present application, Figure 6 As shown, the tooth shoe 22 is provided with a second slot 221 , and the other end of the tooth portion 21 is provided with a second plug-in portion 212 and the second plug-in portion 212 is inserted into the second slot 221 .

[0062] During the assembly of the stator assembly, the stator winding can be first sleeved on the tooth portion 21, and then the tooth boot 22 can be plugged and connected to the tooth portion 21 through the second plug-in portion 212 and the second slot 221. When installing the stator winding, since the tooth boot 22 is separated from the tooth portion 21, the stator slot is not blocked by the tooth boot 22, and there is a larger space for the stator winding to pass through. Therefore, the cross-sectional size of the stator winding can be larger without affecting the installation, and the position of the stator winding in the stator slot is easier to adjust, so that the stator winding can occupy as much space in the stator slot as possible, improve the slot fill rate, and then improve the torque density and motor operating efficiency, and improve the motor performance. In addition, the assembly of the stator assembly is easier, which greatly improves the manufacturing efficiency.

[0063] Of course, in some specific embodiments, the stator yoke 10, the tooth portion 21 and the tooth shoe 22 can be separate parts. The stator yoke 10 and the tooth portion 21 are plugged together by the first slot 101 and the first plug-in portion 211, and the tooth portion 21 and the tooth shoe 22 are plugged together by the second slot 221 and the second plug-in portion 212, which is also beneficial to improving the slot fill rate and making the stator assembly efficient.

[0064] According to the stator core 100 of the embodiment of the utility model, at least one of the stator yoke 10 and the tooth shoe 22 is connected to the tooth portion 21 through a slot and a plug-in portion, so that the stator winding and the stator core 100 are easier to assemble, and the assembly efficiency is improved. The slot fill rate of the stator winding in the stator slot can be higher, which is beneficial to improve the torque density and motor operating efficiency, and improve the motor performance.

[0065] Since the stator core 100 according to the embodiment of the utility model has the above-mentioned beneficial technical effects, the stator assembly according to the embodiment of the utility model is connected to the tooth portion 21 through a slot and a plug-in portion through at least one of the stator yoke 10 and the tooth shoe 22, so that the stator winding and the stator core 100 are easier to assemble, the assembly efficiency is improved, and the slot fill rate of the stator winding in the stator slot can be higher, which is beneficial to improve the torque density and motor operating efficiency, and improve the motor performance.

[0066] Since the stator assembly according to the embodiment of the utility model has the above-mentioned beneficial technical effects, the motor according to the embodiment of the utility model is connected to the tooth portion 21 through a slot and a plug-in portion through at least one of the stator yoke 10 and the tooth shoe 22, so that the stator winding and the stator core 100 are easier to assemble, the assembly efficiency is improved, and the slot fill rate of the stator winding in the stator slot can be higher, which is beneficial to improve the torque density and motor operating efficiency, and improve the motor performance.

[0067] According to some embodiments of the present invention, Figure 1 , Figure 7 , Fig.10 and Fig.13 As shown, the shape of the first slot 101 matches the shape of the first plug-in portion 211 , and the outer surface of the first plug-in portion 211 is clearance-fitted, transition-fitted or interference-fitted with the groove wall surface of the first slot 101 .

[0068] In the above embodiment, no cavity is formed between the slot wall surface of the first slot 101 and the outer surface of the first plug-in portion 211, that is, there is no large gap, thereby reducing or avoiding the formation of an air gap, which is beneficial to reducing magnetic strength loss, reducing magnetic resistance, and improving motor performance.

[0069] For example, the first slot 101 is a rectangular slot, and the first plugging portion 211 is a rectangular structure; the first slot 101 is a trapezoidal slot, and the first plugging portion 211 is a trapezoidal structure, etc. The specific structures of the first slot 101 and the first plugging portion 211 can be flexibly set according to actual conditions.

[0070] In some embodiments, Figure 1-Figure 4 As shown, the size of the first plug-in portion 211 along the circumference of the stator yoke 10 is equal to the size of the tooth portion 21 along the circumference of the stator yoke 10. The stator tooth 20 has a simpler structure and is easier to process and form, and the size of the first plug-in portion 211 is more suitable, which is conducive to improving the strength of the first plug-in portion 211, and then improving the matching strength between the first plug-in portion 211 and the slot wall of the first slot 101. In the embodiment where the tooth portion 21 is made of oriented silicon steel, the first plug-in portion 211 can also be made of oriented silicon steel, and the first plug-in portion 211 and the tooth portion 21 have the same size along the circumference, so that the first plug-in portion 211 is more beneficial to improving the performance of the motor.

[0071] In some embodiments, Figure 7-Figure 9 and Figure 10-12 As shown, the first plug-in portion 211 is provided with a first limiting recess 23 on one of at least one side surface of the stator yoke 10 in the circumferential direction and the slot side wall of the first slot 101, and the other is provided with a first limiting protrusion 24 embedded in the first limiting recess 23. By the first limiting protrusion 24 cooperating with the first limiting recess 23, the stator teeth 20 and the stator yoke 10 can be limited in the radial direction, and the stator teeth 20 and the stator yoke 10 can be more reliably matched and not easily separated.

[0072] In some embodiments, Figure 13-Figure 15 As shown, the size of the first plug-in portion 211 along the circumferential direction of the stator yoke 10 decreases in the direction away from the tooth shoe 22. The first plug-in portion 211 is formed into a trapezoidal or triangular structure. During the assembly process, the stator tooth 20 can move radially to achieve assembly with the stator yoke 10, with low assembly resistance and more convenient and quick assembly. In the embodiment where the tooth portion 21 is made of oriented silicon steel, the first plug-in portion 211 of the above structure can also be made of oriented silicon steel.

[0073] According to some embodiments of the present invention, Figure 6 As shown, the shape of the second slot 221 matches the shape of the second plug-in portion 212 , and the outer surface of the second plug-in portion 212 is clearance-fitted, transition-fitted, or interference-fitted with the groove wall surface of the second slot 221 .

[0074] In the above embodiment, no cavity is formed between the slot wall surface of the second slot 221 and the outer surface of the second plug-in portion 212, that is, there is no large gap, thereby reducing or avoiding the formation of an air gap, which is beneficial to reducing magnetic strength loss, reducing magnetic resistance, and improving motor performance.

[0075] For example, the second slot 221 is a rectangular slot, and the second plugging portion 212 is a rectangular structure; the second slot 221 is a trapezoidal slot, and the second plugging portion 212 is a trapezoidal structure, etc. The specific structures of the second slot 221 and the second plugging portion 212 can be flexibly set according to actual conditions.

[0076] In some embodiments, Figure 6 As shown, the size of the second plug-in portion 212 along the circumferential direction of the stator yoke 10 is equal to the size of the tooth portion 21 along the circumferential direction of the stator yoke 10. The tooth portion 21 has a simpler structure and is easier to process and form, and the size of the second plug-in portion 212 is more suitable, which is conducive to improving the strength of the second plug-in portion 212, and then improving the matching strength between the second plug-in portion 212 and the slot wall of the second slot 221. In the embodiment where the tooth portion 21 is made of oriented silicon steel, the second plug-in portion 212 can also be made of oriented silicon steel, and the second plug-in portion 212 and the tooth portion 21 have the same size along the circumferential direction, so that the second plug-in portion 212 is more beneficial to improving the performance of the motor.

[0077] In some embodiments, the second plug-in portion 212 is provided with a second limiting recess on one of at least one side surface of the stator yoke 10 and the side wall of the second slot 221, and the other is provided with a second limiting protrusion embedded in the second limiting recess. The second limiting protrusion cooperates with the second limiting recess to limit the tooth portion 21 and the tooth shoe 22 in the radial direction, so that the tooth portion 21 and the tooth shoe 22 cooperate more reliably and are not easy to separate.

[0078] In some embodiments, the size of the second plug-in portion 212 along the circumferential direction of the stator yoke 10 decreases in the direction away from the stator yoke 10. The second plug-in portion 212 is formed into a trapezoidal or triangular structure. During the assembly process, the tooth portion 21 can move radially to achieve assembly with the tooth shoe 22, with low assembly resistance and more convenient and quick assembly. In the embodiment where the tooth portion 21 is made of oriented silicon steel, the second plug-in portion 212 of the above structure can also be made of oriented silicon steel.

[0079] According to some embodiments of the present invention, Figure 1 and Figure 2 As shown, the stator yoke 10 includes a yoke body 11 and a plurality of yoke protrusions 12, the yoke body 11 is an annular structure, and the plurality of yoke protrusions 12 are arranged at intervals along the circumference of the yoke body 11. For example, the plurality of yoke protrusions 12 of the outer rotor motor are arranged at intervals along the circumference on the outer peripheral surface of the yoke body 11, and the plurality of yoke protrusions 12 of the inner rotor motor are arranged at intervals along the circumference on the inner peripheral surface of the yoke body 11. A first slot 101 is defined between two adjacent yoke protrusions 12. The stator yoke 10 has a simple structure and is easy to process and shape, and the shape of the first slot 101 can be changed by adjusting the shape of the yoke protrusion 12, which is convenient for processing.

[0080] In addition, the maximum radial dimension of the stator yoke 10 is d1, the radial thickness of the yoke body 11 is d2, and d1 / d2 is greater than 1 and less than or equal to 9.5. The maximum radial dimension of the stator yoke 10 is equal to the sum of the radial thickness of the yoke body 11 and the radial thickness of the yoke protrusion 12.

[0081] If d1 / d2 is too large, the radial thickness of the yoke protrusion 12 will be too large. When the outer diameter of the stator core 100 is constant, the yoke protrusion 12 will occupy too much space in the stator slot, making the space in the stator slot smaller, which is not conducive to improving the motor performance.

[0082] Within the above ratio range, the mechanical connection reliability between the stator teeth 20 and the stator yoke 10 is improved, while the motor torque density and motor operating efficiency are taken into account, thereby improving the motor performance. For example, in some specific embodiments, d1 / d2 can be 1.3, 2, 4, 6, 8, 9, etc.

[0083] According to some embodiments of the present invention, Figure 1 and Figure 2 As shown, the stator yoke 10 includes a yoke body 11 and a plurality of yoke protrusions 12. The yoke body 11 is an annular structure. The plurality of yoke protrusions 12 are arranged at intervals along the circumference of the yoke body 11, and a first slot 101 is defined between two adjacent yoke protrusions 12. The dimension of the end of the yoke protrusion 12 close to the yoke body 11 along the circumference of the stator yoke 10 is W1, and the dimension of the end of the yoke protrusion 12 away from the yoke body 11 along the circumference of the stator yoke 10 is W2, and W2 / W1 is greater than or equal to 0.5 and less than or equal to 11.5.

[0084] Adjustment of the circumferential dimension W1 of the end of the yoke protrusion 12 close to the yoke body 11 along the stator yoke 10 and the circumferential dimension W2 of the end of the yoke protrusion 12 away from the yoke body 11 along the stator yoke 10 will affect the circumferential dimensions of the radial ends of the first plug-in portion 211 and affect the force between the yoke protrusion 12 and the first plug-in portion 211.

[0085] If W2 / W1 is too large, the connection area between the yoke protrusion 12 and the yoke body 11 will be too small, and the connection area between the first plug-in part 211 and the tooth part 21 will be too small, affecting the connection strength; if W2 / W1 is too small, the limiting effect of the yoke protrusion 12 on the first plug-in part 211 in the circumferential and radial directions will be reduced.

[0086] Within the above ratio range, the yoke protrusion 12 is reliably connected to the yoke body 11, the first plug-in portion 211 is reliably connected to the tooth portion 21, and the limiting stability of the yoke protrusion 12 on the first plug-in portion 211 is taken into account, thereby improving the assembly reliability of the stator tooth 20 and the stator yoke 10. For example, in some specific embodiments, W2 / W1 can be 0.5, 1, 2, 5, 8, 10, 11, etc.

[0087] According to some embodiments of the present invention, Figure 1 and Figure 2 As shown, the outer diameter D1 of the stator core 100 and the inner diameter D2 of the stator core 100 satisfy: D1 / D2 is greater than 1.5 and less than 19.

[0088] For example, for an outer rotor motor, the outer diameter of the stator core 100 refers to the diameter of the circle where the outer circumference of the tooth shoe 22 is located, and the inner diameter of the stator core 100 refers to the diameter of the inner circumference of the stator yoke 10 .

[0089] If D1 / D2 is too small, the radial dimension of the stator slot will be too small and the space inside the stator slot will be too small, which is not conducive to the motor performance; if D1 / D2 is too large, the inner diameter of the stator yoke 10 will be too small, which is not conducive to processing.

[0090] Within the above ratio range, the stator core 100 is easy to process, and the stator slot size is appropriate, which is conducive to improving torque density and motor efficiency and improving motor performance. For example, in some specific embodiments, D1 / D2 can be 1.6, 5, 10, 15, and 18, etc.

[0091] According to some embodiments of the present invention, Figure 4-Figure 5 , Fig. 9 , Fig.12 and Fig.15 As shown, the size of the tooth portion 21 along the circumferential direction of the stator core 100 is equal everywhere.

[0092] In some embodiments, the tooth portion 21 is made of oriented silicon steel, and the orientation direction is parallel to the radial direction of the tooth portion 21. The saturation magnetic induction of oriented silicon steel is high, which can reduce current and copper loss; and the iron loss is low, which can reduce iron loss. Therefore, the use of oriented silicon steel in the tooth portion 21 can further improve the torque and motor operating efficiency, which is beneficial to improving the performance of the motor.

[0093] It is worth noting that since the dimensions of the tooth portion 21 along the circumference of the stator core 100 are equal everywhere, the tooth portion 21 can be made of oriented silicon steel while ensuring higher performance, while for other irregularly shaped teeth 21, oriented silicon steel cannot be used without affecting performance.

[0094] Among them, in the embodiment including the first plug-in portion 211 and the second plug-in portion 212, taking the first plug-in portion 211 as an example, when the circumferential width of the first plug-in portion 211 is equal to the circumferential width of the tooth portion 21, the first plug-in portion 211 and the tooth portion 21 are integrally formed and both use oriented silicon steel, which is more conducive to improving performance; and when the first plug-in portion 211 is provided with a first limiting protrusion 24 or a first limiting recess 23, since the first plug-in portion 211 does not directly cooperate with the stator winding, oriented silicon steel can also be used, but it will not have an adverse effect on the performance.

[0095] In some embodiments, the stator yoke 10 can be made of non-oriented silicon steel, solid magnetic conductive components (such as bulk molding compound, BMC) or metal soft magnetic composite materials (SMC). The stator yoke 10 is far away from the air gap between the stator assembly and the rotor assembly, with low loss and little effect on performance improvement. Compared with oriented silicon steel, non-oriented silicon steel, solid magnetic conductive components and metal soft magnetic composite materials have lower costs. Therefore, the use of the above materials in the stator yoke 10 can reduce the cost of the stator assembly without affecting the performance of the motor.

[0096] In some embodiments of the present invention, Figure 4 As shown, the side surface of the tooth shoe 22 facing the tooth portion 21 can extend perpendicularly to the radial direction of the stator yoke 10; or, the side surface of the tooth shoe 22 facing the tooth portion 21 is an arc surface, and the central axis of the arc surface coincides with the axis of the stator yoke 10. This can enable the tooth shoe 22 to achieve a good limiting effect on the stator winding without affecting the size of the space in the stator slot. The stator slot can be as large as possible to improve the torque density and motor operation efficiency.

[0097] In some embodiments of the present invention, the stator assembly includes an overmolded body, which overmoldes the stator core 100 and the stator winding. The overmolded body can be formed by an injection molding process, for example, the material of the overmolded body includes but is not limited to bulk molding compound (BMC).

[0098] During the production process, the assembled stator core 100 and stator winding can be placed in an injection mold, and then the overmolded body is injection-molded. The overmolded body obtained by injection molding can overmold the stator core 100 and the stator winding at the same time. On the one hand, it reduces the assembly process and improves production efficiency. On the other hand, the overmolded body can provide protection such as waterproof insulation to the stator core 100 and the stator winding, thereby reducing corrosion and damage to the stator core 100 and the stator winding.

[0099] In addition, the plastic coating can further fix the plug-in structure of the stator core 100, such as fixing the plug-in structure between the tooth portion 21 and the stator yoke 10, and fixing the plug-in structure between the tooth portion 21 and the tooth shoe 22, so as to improve the integrity and structural stability of the stator core 100.

[0100] It is worth noting that the overmolding body may completely wrap the stator core 100 and the stator winding, or the overmolding body may partially wrap the stator core 100 and the stator winding, which are all within the protection scope of the present utility model.

[0101] In some embodiments of the present invention, the number of poles Np of the rotor assembly is greater than 2 and less than 30; the number of teeth Ns of the stator teeth 20 is greater than 3 and less than 30, and the number of corresponding stator slots is equal to the number of teeth Ns; the absolute value of Ns-Np is greater than or equal to 1 and less than or equal to 6. Within the above range of values, the number of poles of the rotor assembly is more matched with the number of slots of the stator assembly, meeting the application requirements of most motors.

[0102] In some specific embodiments, the number Ns of the stator teeth 20 may be 9 or 12, etc., and the number Np of the poles of the rotor assembly may be 8, 10, 12, 14, etc.

[0103] The electrical equipment according to the embodiment of the utility model includes the motor according to the embodiment of the utility model. Since the motor according to the embodiment of the utility model has the above-mentioned beneficial technical effects, the electrical equipment according to the embodiment of the utility model is connected to the tooth part 21 through the slot and the plug-in part by at least one of the stator yoke part 10 and the tooth shoe 22, so that the stator winding and the stator core 100 are easier to assemble, the assembly efficiency is improved, and the slot filling rate of the stator winding in the stator slot can be higher, which is conducive to improving the torque density and the motor operation efficiency, and improving the motor performance.

[0104] Here, the electrical equipment may be household appliances such as fans, air-conditioning compressors, refrigerator compressors, drum washing machines, etc., or electrical equipment in the fields of industrial control and transportation, etc., all of which are within the protection scope of the present utility model.

[0105] A motor according to a specific embodiment of the present utility model is described in detail below with reference to the accompanying drawings. It is worth noting that the following description is only an exemplary illustration and cannot be construed as a limitation to the utility model.

[0106] like Figure 1-Figure 4 As shown, the motor according to the embodiment of the utility model can be applied to a compressor, and the motor includes a stator assembly and a rotor assembly, and the rotor assembly is sleeved outside the stator assembly. The stator assembly includes a plastic package, a stator core 100 and a stator winding, and the stator winding is wound around the tooth portion 21 of the stator core 100, and the plastic package plastic packages the stator core 100 and the stator winding. The stator core 100 includes a stator yoke 10 and a stator tooth 20, and the stator tooth 20 includes an integrally connected tooth portion 21 and a tooth shoe 22, and the radial inner end of the tooth portion 21 is provided with a first plug-in portion 211, and the outer peripheral surface of the stator yoke 10 is provided with a first slot 101, and the tooth portion 21 is inserted into the first slot 101 of the stator yoke 10 through the first plug-in portion 211, and the stator tooth 20 is fixed to the stator yoke 10 in cooperation with the plastic package.

[0107] The cross section of the tooth portion 21 perpendicular to the axial direction of the stator core 100 is a rectangle, the width of the first plug-in portion 211 along the circumferential direction is equal to the width of the tooth portion 21 along the circumferential direction, and the stator tooth 20 is made of oriented silicon steel, and the orientation direction is parallel to the length direction of the rectangle, that is, the radial direction of the tooth portion 21. The tooth shoe 22 extends toward the inner side surface of the tooth portion 21 perpendicular to the radial direction of the tooth portion 21. The stator yoke 10 is made of non-oriented silicon steel.

[0108] The motor of the above embodiment has a high slot fill rate of the stator winding in the stator slot, which is beneficial to improving the torque density and motor operating efficiency. The torque is further improved by using oriented silicon steel, and the copper loss and iron loss are reduced, thereby further improving the efficiency.

[0109] Other structures and operations of the motor and electrical equipment according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0110] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0111] In the description of this specification, the description with reference to the terms "embodiment", "specific embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0112] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A stator core, characterized in that: include: stator yoke; A plurality of stator teeth, each stator tooth comprising a tooth portion and a tooth shoe, wherein the tooth portion extends radially along the stator yoke portion, and radial ends of the tooth portion are respectively connected to the stator yoke portion and the tooth shoe, wherein: The inner circumference or outer circumference of the stator yoke is provided with a plurality of first slots, and the plurality of first slots are arranged at intervals along the circumference of the stator yoke; one end of the tooth portion is provided with a first plug-in portion, and the first plug-in portion is inserted into the first slot; and / or the tooth boot is provided with a second slot, and the other end of the tooth portion is provided with a second plug-in portion, and the second plug-in portion is inserted into the second slot.

2. The stator core according to claim 1, characterized in that: The shape of the first slot matches the shape of the first plug-in portion, and the outer surface of the first plug-in portion is clearance-fitted, transition-fitted or interference-fitted with the slot wall surface of the first slot.

3. The stator core according to claim 2, characterized in that: The size of the first plug-in portion along the circumferential direction of the stator yoke is equal to the size of the tooth portion along the circumferential direction of the stator yoke; or, The first plug-in portion is provided with a first limiting recess on one of at least one circumferential side surface of the stator yoke and a slot side wall of the first slot, and the other is provided with a first limiting protrusion embedded in the first limiting recess; or, The dimension of the first inserting portion along the circumferential direction of the stator yoke decreases gradually in a direction away from the tooth shoe.

4. The stator core according to claim 1, characterized in that: The shape of the second slot matches the shape of the second plug-in portion, and the outer surface of the second plug-in portion is clearance-fitted, transition-fitted or interference-fitted with the slot wall surface of the second slot.

5. The stator core according to claim 4, characterized in that: The size of the second plug-in portion along the circumferential direction of the stator yoke is equal to the size of the tooth portion along the circumferential direction of the stator yoke; or, The second plug-in portion is provided with a second limiting recess on one of at least one circumferential side surface of the stator yoke and a slot side wall of the second slot, and the other is provided with a second limiting protrusion embedded in the second limiting recess; or, A dimension of the second inserting portion along the circumferential direction of the stator yoke decreases gradually in a direction away from the stator yoke.

6. The stator core according to claim 1, characterized in that: The stator yoke comprises a yoke body and a plurality of yoke protrusions, the yoke body is an annular structure, the plurality of yoke protrusions are arranged at intervals along the circumference of the yoke body, and the first slot is defined between two adjacent yoke protrusions. The maximum radial dimension of the stator yoke is d1, the radial thickness of the yoke body is d2, and d1 / d2 is greater than 1 and less than or equal to 9.

5.

7. The stator core according to claim 1, characterized in that: The stator yoke comprises a yoke body and a plurality of yoke protrusions, the yoke body is an annular structure, the plurality of yoke protrusions are arranged at intervals along the circumference of the yoke body, and the first slot is defined between two adjacent yoke protrusions. The dimension of the end of the yoke protrusion close to the yoke body along the circumferential direction of the stator yoke is W1, and the dimension of the end of the yoke protrusion away from the yoke body along the circumferential direction of the stator yoke is W2, and W2 / W1 is greater than or equal to 0.5 and less than or equal to 11.

5.

8. The stator core according to claim 1, characterized in that: The outer diameter D1 of the stator core and the inner diameter D2 of the stator core satisfy: D1 / D2 is greater than 1.5 and less than 19.

9. The stator core according to any one of claims 1 to 8, characterized in that: The size of the tooth portion along the circumferential direction of the stator core is equal everywhere.

10. The stator core according to claim 9, characterized in that: The tooth portion is made of oriented silicon steel, and the orientation direction is parallel to the radial direction of the tooth portion.

11. The stator core according to any one of claims 1 to 8, characterized in that: The stator yoke is made of non-oriented silicon steel, a solid magnetic conductive component or a metal soft magnetic composite material.

12. The stator core according to claim 1, characterized in that: A side surface of the tooth shoe facing the tooth portion extends perpendicularly to the radial direction of the stator yoke portion; or, a side surface of the tooth shoe facing the tooth portion is an arc-shaped surface, and a central axis of the arc-shaped surface coincides with an axis of the stator yoke portion.

13. A stator assembly, characterized in that: It comprises a stator winding and a stator core according to any one of claims 1 to 12, wherein the stator winding is wound around the tooth portion.

14. The stator assembly according to claim 13, characterized in that It comprises a plastic-encapsulating body, wherein the plastic-encapsulating body encapsulates the stator core and the stator winding.

15. A motor, characterized in that: It comprises a rotor assembly and a stator assembly according to claim 13 or 14.

16. The motor according to claim 15, characterized in that The number of poles Np of the rotor assembly is greater than 2 and less than 30; the number of teeth Ns of the stator teeth is greater than 3 and less than 30; and the absolute value of Ns-Np is greater than or equal to 1 and less than or equal to 6.

17. An electrical device, characterized in that: Comprising an electric machine according to claim 15 or 16.

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