Stator core, stator assembly, motor, and electrical appliance

Abstract

A stator core (100), a stator assembly, a motor, and an electrical appliance. The stator core (100) comprises: a stator yoke (10); and a plurality of stator teeth (20), each stator tooth (20) comprising a tooth portion (21) and a tooth shoe (22), the tooth portion (21) extending in the radial direction of the stator yoke (10), and two radial ends of the tooth portion (21) being respectively connected to the stator yoke (10) and the tooth shoe (22), wherein the inner circumferential surface or the outer circumferential surface of the stator yoke (10) is provided with a plurality of first slots (101), the plurality of first slots (101) are arranged at intervals in the circumferential direction of the stator yoke (10), one end of each tooth portion (21) is provided with a first inserting portion (211), and the first inserting portion (211) is inserted into the corresponding first slot (101); and / or, each tooth shoe (22) is provided with a second slot (221), the other end of each tooth portion (21) is provided with a second inserting portion (212), and the second inserting portion (212) is inserted into the corresponding second slot (221).

Description

Stator core, stator assembly, motor and electrical appliance

[0001] Cross-reference to related applications

[0002] The present application claims priority to the priority of Chinese patent application No. “202410726626.4” and “202421280487.9” filed on June 05, 2024 by Wiling (Wuhu) Motor Manufacturing Co., Ltd. and Guangdong Wiling Motor Manufacturing Co., Ltd., the contents of which are hereby incorporated by reference in their entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of stators, and more particularly, to a stator core, a stator assembly, a motor and an electrical appliance. BACKGROUND

[0004] In the related art, the slot fill factor of the stator assembly is low, which affects the improvement of torque density and motor operating efficiency, resulting in that the performance of the motor cannot meet the demand. SUMMARY

[0005] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present application is to provide a stator core that improves torque density and operating efficiency.

[0006] The present application also provides a stator assembly having the above-mentioned stator core.

[0007] The present application also provides a motor having the above-mentioned stator assembly.

[0008] The present application also provides an electrical appliance having the above-mentioned motor.

[0009] According to the stator core of the present application, at least one of the stator yoke and the tooth shoe is connected to the tooth portion through the insertion slot and the insertion portion, which makes the assembly of the stator winding and the stator core easier, improves the assembly efficiency, and the slot fill factor of the stator winding in the stator slot can be higher, thereby facilitating the improvement of torque density and motor operating efficiency and improving the performance of the motor.

[0010] According to the stator core of the present application, at least one of the stator yoke and the tooth shoe is connected to the tooth portion through the insertion slot and the insertion portion, which makes the assembly of the stator winding and the stator core easier, improves the assembly efficiency, and the slot fill factor of the stator winding in the stator slot can be higher, thereby facilitating the improvement of torque density and motor operating efficiency and improving the performance of the motor.

[0011] In addition, the stator core according to the above-mentioned embodiments of the present application can further have the following additional technical features:

[0012] According to some embodiments of the present application, the shape of the first slot matches the shape of the first plug-in part, and the outer surface of the first plug-in part is gap-fitted, transition-fitted or interference-fitted with the slot wall surface of the first slot.

[0013] According to some embodiments of the present application, the size of the first plug-in part along the circumferential direction of the stator yoke part is equal to the size of the tooth part along the circumferential direction of the stator yoke part; or one of the circumferential side surface of the first plug-in part and the slot side wall of the first slot is provided with a first limiting recess, and the other is provided with a first limiting protrusion embedded in the first limiting recess; or the size of the first plug-in part along the circumferential direction of the stator yoke part decreases in the direction away from the tooth shoe.

[0014] According to some embodiments of the present application, the shape of the second slot matches the shape of the second plug-in part, and the outer surface of the second plug-in part is gap-fitted, transition-fitted or interference-fitted with the slot wall surface of the second slot.

[0015] According to some embodiments of the present application, the size of the second plug-in part along the circumferential direction of the stator yoke part is equal to the size of the tooth part along the circumferential direction of the stator yoke part; or one of the circumferential side surface of the second plug-in part and the slot side wall of the second slot is provided with a second limiting recess, and the other is provided with a second limiting protrusion embedded in the second limiting recess; or the size of the second plug-in part along the circumferential direction of the stator yoke part decreases in the direction away from the stator yoke part.

[0016] According to some embodiments of the present application, the stator yoke part comprises a yoke part body and a plurality of yoke part protrusions, the yoke part body is annular in structure, the plurality of yoke part protrusions are arranged at intervals along the circumferential direction of the yoke part body, and the first slot is defined between two adjacent yoke part protrusions, the maximum radial dimension of the stator yoke part is d1, the radial thickness of the yoke part body is d2, and d1 / d2 is greater than 1 and less than or equal to 9.5.

[0017] According to some embodiments of the present application, the stator yoke part comprises a yoke part body and a plurality of yoke part protrusions, the yoke part body is annular in structure, the plurality of yoke part protrusions are arranged at intervals along the circumferential direction of the yoke part body, and the first slot is defined between two adjacent yoke part protrusions, the size of the yoke part protrusion along the circumferential direction of the stator yoke part at the end close to the yoke part body is W1, the size of the yoke part protrusion along the circumferential direction of the stator yoke part at the end away from the yoke part body is W2, and W2 / W1 is greater than or equal to 0.5 and less than or equal to 11.5.

[0018] According to some embodiments of the present application, 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.

[0019] According to some embodiments of the present application, the size of the tooth portion along the circumference of the stator core is equal everywhere.

[0020] According to some embodiments of the present application, the tooth portion adopts oriented silicon steel, and the orientation direction is parallel to the radial direction of the tooth portion.

[0021] According to some embodiments of the present application, the stator yoke portion is non-oriented silicon steel, a solid magnetic component or a metal soft magnetic composite material.

[0022] According to some embodiments of the present application, the side surface of the tooth shoe facing the tooth portion extends perpendicularly to the radial direction of the stator yoke portion; or, the side surface of the tooth shoe facing the tooth portion is an arc surface, and the central axis of the arc surface coincides with the axis of the stator yoke portion.

[0023] The stator assembly according to the embodiments of the present application comprises a stator winding and a stator core according to the embodiments of the present application, and the stator winding is wound around the tooth portion.

[0024] According to some embodiments of the present application, the stator assembly comprises a plastic package body, and the plastic package body packages the stator core and the stator winding.

[0025] The motor according to the embodiments of the present application comprises a rotor assembly and a stator assembly according to the embodiments of the present application.

[0026] According to some embodiments of the present application, 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 tooth 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.

[0027] The electrical appliance according to the embodiments of the present application comprises a motor according to the embodiments of the present application.

[0028] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0029] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings, wherein:

[0030] FIG. 1 is a structural schematic diagram of a stator core according to a first embodiment of the present application;

[0031] FIG. 2 is a structural schematic diagram of a stator yoke portion in FIG. 1;

[0032] Fig. 3 is a structural diagram of the plurality of stator teeth in Fig. 1;

[0033] Fig. 4 is a structural diagram of one stator tooth in Fig. 1;

[0034] Fig. 5 is a structural diagram of the arrangement of two stator teeth of the stator core in Fig. 1 in a production process;

[0035] Fig. 6 is a structural diagram of a stator tooth according to a second embodiment of the present application;

[0036] Fig. 7 is a structural diagram of a stator core according to a third embodiment of the present application;

[0037] Fig. 8 is a structural diagram of a stator yoke in Fig. 7;

[0038] Fig. 9 is a structural diagram of one stator tooth in Fig. 7;

[0039] Fig. 10 is a structural diagram of a stator core according to a fourth embodiment of the present application;

[0040] Fig. 11 is a structural diagram of a stator yoke in Fig. 10;

[0041] Fig. 12 is a structural diagram of one stator tooth in Fig. 10;

[0042] Fig. 13 is a structural diagram of a stator core according to a fifth embodiment of the present application;

[0043] Fig. 14 is a structural diagram of a stator yoke in Fig. 13;

[0044] Fig. 15 is a structural diagram of one stator tooth in Fig. 13.

[0045] Reference Signs:

[0046] Stator core 100;

[0047] Stator yoke 10; first insertion slot 101; yoke body 11; yoke protrusion 12;

[0048] Stator tooth 20; tooth portion 21; first insertion portion 211; second insertion portion 212; tooth shoe 22; second insertion slot 221; first limiting recess 23; first limiting protrusion 24. Embodiments of the present application

[0049] Embodiments of the present application

[0050] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0051] In the description of the present application, "first feature" and "second feature" can include one or more features, and the meaning of "multiple" is two or more. The "above" or "below" of the first feature relative to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. The "above", "over" and "on" of the first feature relative to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height.

[0052] In the related art, the stator core of the stator assembly is of a one-piece structure. When the stator winding is assembled with the stator core, the stator winding needs to be installed radially into the stator slot through the stator slot opening. In order to realize stable installation and limiting of the stator winding on the stator core, the stator core has a tooth shoe for limiting the stator winding into the stator slot. The tooth shoe is arranged such that the opening size of the stator slot opening along the circumferential direction of the stator core is smaller than the size in the stator slot. The stator winding is inconvenient to be assembled into the stator slot, and the size of the stator winding cannot be too large. This results in a low slot fill rate in the stator slot, and further results in low torque density and motor operating efficiency, which greatly affects the motor manufacturing efficiency and performance.

[0053] Based on this, the present application proposes a stator core 100. At least one of the stator yoke 10 and the tooth shoe 22 is connected to the tooth portion 21 through the insertion slot and the insertion portion, which makes the assembly of the stator winding and the stator core 100 easier, improves the assembly efficiency, and the slot fill rate of the stator winding in the stator slot can be higher, which is conducive to improving the torque density and the motor operating efficiency, and improving the motor performance.

[0054] The stator core 100, the stator winding and the motor according to the embodiments of the present application will be described below with reference to the accompanying drawings.

[0055] Referring to FIGS. 1-4, the stator core 100 according to the embodiments of the present application can include a stator yoke 10 and a plurality of stator teeth 20.

[0056] Specifically, the stator tooth 20 comprises a tooth portion 21 and a tooth shoe 22, the tooth portion 21 extends along the radial direction of the stator yoke 10, and the two ends of the tooth portion 21 are connected with the stator yoke 10 and the tooth shoe 22 respectively. 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 any two adjacent stator teeth 20.

[0057] The stator assembly according to the embodiments of the present application comprises a stator winding and the stator core 100 according to the embodiments of the present application, and the stator winding is wound around the tooth portion 21. In this way, the stator winding can be mounted 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 the two radial sides of the tooth portion 21, so that the mounting structure of the stator winding and the stator core 100 is stable.

[0058] The motor according to the embodiments of the present application comprises a rotor assembly and the stator assembly according to the embodiments of the present application. 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 as an inner rotor motor or an outer rotor motor. The stator assembly cooperates with the rotor assembly to rotate the rotor assembly, so as to realize the operation of the motor.

[0059] In addition, in some embodiments of the present application, still referring to FIGS. 1-4, the inner circumferential surface or the outer circumferential surface of the stator yoke 10 is provided with a plurality of first insertion slots 101, the plurality of first insertion slots 101 are arranged at intervals along the circumferential direction of the stator yoke 10, one end of the tooth portion 21 is provided with a first insertion portion 211 and the first insertion portion 211 is inserted into the first insertion slot 101.

[0060] In the embodiment in which the inner circumferential surface of the stator yoke 10 is provided with a plurality of first insertion slots 101, the radial outer end of the tooth portion 21 is connected with the stator yoke 10 through the first insertion portion 211, the radial inner end of the tooth portion 21 is connected with the tooth shoe 22, and the plurality of tooth shoes 22 define a stator hole for accommodating the rotor assembly. The motor comprising the above-mentioned stator core 100 is an inner rotor motor. In the embodiment in which the outer circumferential surface of the stator yoke 10 is provided with a plurality of first insertion slots 101, the radial inner end of the tooth portion 21 is connected with the stator yoke 10 through the first insertion portion 211, the radial outer end of the tooth portion 21 is connected with the tooth shoe 22, and the rotor assembly can be sleeved outside the stator assembly comprising the above-mentioned stator core 100, so that the motor is formed as an outer rotor motor.

[0061] In the assembling process of the stator assembly, the stator winding can be sleeved on the tooth portion 21 of the stator tooth 20 first, and then the plurality of stator teeth 20 and the stator yoke portion 10 are connected through the first insertion slot 101 and the first insertion portion 211. When installing the stator winding, since the plurality of stator teeth 20 are separated from each other, the installation of the stator winding is not interfered by the adjacent stator teeth 20, and is not limited by the size of the stator slot, and the cross-sectional size of the stator winding can be larger without affecting the installation. After the stator tooth 20 and the stator yoke portion 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 as possible in the stator slot, improve the slot fill rate, and further improve the torque density and the motor operating efficiency, and improve the motor performance. Moreover, the assembling of the stator assembly is easier, and the manufacturing efficiency is greatly improved.

[0062] In addition, in the case that the plurality of stator teeth 20 are separated from each other, in the process of manufacturing the stator tooth 20, it is also beneficial to improve the production efficiency and improve the material utilization rate. Specifically, the stator tooth 20 can be formed by laminating a plurality of tooth punches in the thickness direction, and the tooth punch is formed by a stamping process, and the tooth portion 21 and the tooth shoe 22 of the stator tooth 20 are generally formed in a T-shaped structure. When processing the tooth punch, as shown in FIG. 5, the upright T-shaped tooth punch and the inverted T-shaped tooth punch can be stamped on a large area of plate material, so that more tooth punches can be processed in a unit area of plate material, and the material utilization rate is improved.

[0063] In some embodiments of the present application, as shown in FIG. 6, the tooth shoe 22 is provided with a second insertion slot 221, and the other end of the tooth portion 21 is provided with a second insertion portion 212 which is inserted into the second insertion slot 221.

[0064] In the assembling process of the stator assembly, the stator winding can be sleeved on the tooth portion 21 first, and then the tooth shoe 22 and the tooth portion 21 are connected through the second insertion portion 212 and the second insertion slot 221. When installing the stator winding, since the tooth shoe 22 and the tooth portion 21 are separated, the space available for the stator winding is larger because the stator slot is not blocked by the tooth shoe 22. 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 as possible in the stator slot, improve the slot fill rate, and further improve the torque density and the motor operating efficiency, and improve the motor performance. Moreover, the assembling of the stator assembly is easier, and the manufacturing efficiency is greatly improved.

[0065] Of course, in some specific embodiments, the stator yoke portion 10, the tooth portion 21 and the tooth shoe 22 can be separate parts, the stator yoke portion 10 and the tooth portion 21 are connected through the first insertion slot 101 and the first insertion portion 211, and the tooth portion 21 and the tooth shoe 22 are connected through the second insertion slot 221 and the second insertion portion 212, which is also beneficial to improve the slot fill rate and make the assembling efficiency of the stator assembly high.

[0066] According to the stator core 100 of the embodiment of the present application, the stator yoke 10 and the tooth shoe 22 are connected to the tooth 21 through the slot and the insertion part, which makes the assembly of the stator winding and the stator core 100 easier, improves the assembly efficiency, and the slot fill rate of the stator winding in the stator slot can be higher, which is conducive to improving the torque density and the motor operating efficiency and improving the motor performance.

[0067] According to the stator core 100 of the embodiment of the present application, the stator yoke 10 and the tooth shoe 22 are connected to the tooth 21 through the slot and the insertion part, which makes the assembly of the stator winding and the stator core 100 easier, improves the assembly efficiency, and the slot fill rate of the stator winding in the stator slot can be higher, which is conducive to improving the torque density and the motor operating efficiency and improving the motor performance.

[0068] According to the stator core 100 of the embodiment of the present application, the stator yoke 10 and the tooth shoe 22 are connected to the tooth 21 through the slot and the insertion part, which makes the assembly of the stator winding and the stator core 100 easier, improves the assembly efficiency, and the slot fill rate of the stator winding in the stator slot can be higher, which is conducive to improving the torque density and the motor operating efficiency and improving the motor performance.

[0069] According to some embodiments of the present application, as shown in FIGS. 1, 7, 10 and 13, the shape of the first slot 101 matches the shape of the first insertion part 211, and the outer surface of the first insertion part 211 is in clearance fit, transition fit or interference fit with the slot wall surface of the first slot 101.

[0070] In the above embodiments, no cavity is formed between the slot wall surface of the first slot 101 and the outer surface of the first insertion part 211, that is, there is no large gap, so as to reduce or avoid the formation of air gap, which is conducive to reducing the magnetic strength loss, reducing the magnetic resistance and improving the motor performance.

[0071] For example, the first slot 101 is a rectangular slot, and the first insertion part 211 is a rectangular structure; the first slot 101 is a trapezoidal slot, and the first insertion part 211 is a trapezoidal structure, etc. The specific structure of the first slot 101 and the first insertion part 211 can be flexibly set according to the actual situation.

[0072] In some embodiments, as shown in FIGS. 1-4, the circumferential dimension of the first insertion part 211 is equal to the circumferential dimension of the tooth part 21. The stator tooth 20 is simpler in structure and easier to process, and the size of the first insertion part 211 is more appropriate, which is conducive to improving the strength of the first insertion part 211 and the fitting strength between the first insertion part 211 and the slot wall of the first insertion slot 101. In addition, in the embodiment in which the tooth part 21 is made of oriented silicon steel, the first insertion part 211 can also be made of oriented silicon steel, and the same circumferential dimension of the first insertion part 211 and the tooth part 21 is more conducive to improving the performance of the motor.

[0073] In some embodiments, as shown in FIGS. 7-9 and FIGS. 10-12, the first insertion part 211 is provided with a first limiting recess 23 on one of the circumferential side surface of the stator yoke 10 and the slot side wall of the first insertion slot 101, and the other is provided with a first limiting protrusion 24 embedded in the first limiting recess 23. Through the cooperation of the first limiting protrusion 24 and the first limiting recess 23, the stator tooth 20 and the stator yoke 10 can be limited in the radial direction, and the cooperation between the stator tooth 20 and the stator yoke 10 is more reliable and less likely to separate.

[0074] In some embodiments, as shown in FIGS. 13-15, the circumferential dimension of the first insertion part 211 decreases in the direction away from the tooth shoe 22. The first insertion part 211 is formed in a trapezoidal or triangular structure, and during assembly, the stator tooth 20 can move in the radial direction to realize the assembly with the stator yoke 10, which is small in assembly resistance and convenient and fast in assembly. In addition, in the embodiment in which the tooth part 21 is made of oriented silicon steel, the first insertion part 211 with the above structure can also be made of oriented silicon steel.

[0075] According to some embodiments of the present application, as shown in FIG. 6, the shape of the second insertion slot 221 matches the shape of the second insertion part 212, and the outer surface of the second insertion part 212 is in clearance fit, transition fit or interference fit with the slot wall surface of the second insertion slot 221.

[0076] In the above embodiments, no cavity is formed between the slot wall surface of the second insertion slot 221 and the outer surface of the second insertion part 212, i.e., there is no large gap, so as to reduce or avoid the formation of air gap, which is conducive to reducing the magnetic strength loss, reducing the magnetic resistance and improving the performance of the motor.

[0077] For example, the second insertion slot 221 is a rectangular slot, and the second insertion part 212 is a rectangular structure; the second insertion slot 221 is a trapezoidal slot, and the second insertion part 212 is a trapezoidal structure, etc. The specific structure of the second insertion slot 221 and the second insertion part 212 can be flexibly set according to actual conditions.

[0078] In some embodiments, as shown in FIG. 6, the second insertion part 212 has a size along the circumferential direction of the stator yoke part 10 equal to that of the tooth part 21. The tooth part 21 has a simpler structure and is easier to be formed, and the size of the second insertion part 212 is more appropriate, which is conducive to improving the strength of the second insertion part 212 and further improving the fitting strength of the second insertion part 212 and the slot wall of the second insertion slot 221. In addition, in the embodiment in which the tooth part 21 is made of oriented silicon steel, the second insertion part 212 can also be made of oriented silicon steel, and the equal size of the second insertion part 212 and the tooth part 21 along the circumferential direction is more conducive to improving the performance of the motor.

[0079] In some embodiments, the second insertion part 212 is provided with a second limiting recess on one of the circumferential side surface of the stator yoke part 10 and the slot side wall of the second insertion slot 221, and a second limiting protrusion embedded in the second limiting recess is provided on the other. Through the cooperation of the second limiting protrusion and the second limiting recess, the tooth part 21 and the tooth shoe 22 can be limited in the radial direction, and the cooperation of the tooth part 21 and the tooth shoe 22 is more reliable and less likely to separate.

[0080] In some embodiments, the size of the second insertion part 212 along the circumferential direction of the stator yoke part 10 decreases in the direction away from the stator yoke part 10. The second insertion part 212 is formed in a structure similar to a trapezoid or a triangle, and in the assembly process, the tooth part 21 can move in the radial direction to realize the assembly with the tooth shoe 22, which has small assembly resistance and is more convenient and fast. In addition, in the embodiment in which the tooth part 21 is made of oriented silicon steel, the second insertion part 212 with the above structure can also be made of oriented silicon steel.

[0081] According to some embodiments of the present application, as shown in FIGS. 1 and 2, the stator yoke part 10 includes a yoke part body 11 and a plurality of yoke part protrusions 12. The yoke part body 11 has a ring structure, and the plurality of yoke part protrusions 12 are arranged at intervals along the circumferential direction of the yoke part body 11, for example, the plurality of yoke part protrusions 12 of an external rotor motor are arranged at intervals along the circumferential direction of the outer circumferential surface of the yoke part body 11, and the plurality of yoke part protrusions 12 of an internal rotor motor are arranged at intervals along the circumferential direction of the inner circumferential surface of the yoke part body 11. The first insertion slot 101 is defined between two adjacent yoke part protrusions 12. The stator yoke part 10 has a simple structure and is easy to be formed, and the shape of the first insertion slot 101 can be changed by adjusting the shape of the yoke part protrusion 12, which is convenient for processing.

[0082] In addition, the maximum radial dimension of the stator yoke part 10 is d1, the radial thickness of the yoke part 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 part 10 is equal to the sum of the radial thickness of the yoke part body 11 and the radial thickness of the yoke part protrusion 12.

[0083] If d1 / d2 is too large, the radial thickness of the yoke protrusion 12 will be too large, the yoke protrusion 12 will occupy too much space in the stator slot under the condition that the outer diameter of the stator core 100 is constant, and the space in the stator slot will be small, which is not conducive to improving the performance of the motor.

[0084] Within the above ratio range, the mechanical connection reliability of the stator tooth 20 and the stator yoke 10 is improved, the motor torque density and the motor operating efficiency are taken into account, and the motor performance is improved. For example, in some specific embodiments, d1 / d2 can be 1.3, 2, 4, 6, 8, 9, etc.

[0085] According to some embodiments of the present application, as shown in FIGS. 1 and 2, 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 along the circumference of the yoke body 11, and a first insertion slot 101 is defined between adjacent two yoke protrusions 12. The dimension of the yoke protrusion 12 close to the yoke body 11 along the circumference of the stator yoke 10 is W1, the dimension 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.

[0086] Adjusting the dimension W1 of the yoke protrusion 12 close to the yoke body 11 along the circumference of the stator yoke 10 and the dimension W2 of the yoke protrusion 12 away from the yoke body 11 along the circumference of the stator yoke 10 will affect the dimension of the first insertion portion 211 along the circumference at both ends in the radial direction, and affect the stress between the yoke protrusion 12 and the first insertion portion 211.

[0087] If W2 / W1 is too large, the connection area between the yoke protrusion 12 and the yoke body 11 will be too small, the connection area between the first insertion portion 211 and the tooth portion 21 will be too small, and the connection strength will be affected; if W2 / W1 is too small, the limiting effect of the yoke protrusion 12 on the first insertion portion 211 in the circumferential and radial directions will be reduced.

[0088] Within the above ratio range, the yoke protrusion 12 and the yoke body 11 are connected reliably, the first insertion portion 211 and the tooth portion 21 are connected reliably, and the limiting stability of the yoke protrusion 12 on the first insertion 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.

[0089] According to some embodiments of the present application, as shown in FIGS. 1 and 2, 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.

[0090] For example, for an external rotor motor, the outer diameter of the stator core 100 refers to the diameter of the circle on which the outer circumferential surface of the toothed shoe 22 is located, and the inner diameter of the stator core 100 refers to the diameter of the inner circumferential surface of the stator yoke 10.

[0091] If D1 / D2 is too small, the radial dimension of the stator slot will be too small, and the space in the stator slot will be too small, which is not conducive to the performance of the motor. If D1 / D2 is too large, the inner diameter of the stator yoke 10 will be too small, which is not conducive to processing.

[0092] Within the above range, the stator core 100 is easy to process, and the size of the stator slot is appropriate, which is conducive to improving the torque density and the efficiency of the motor and improving the performance of the motor. For example, in some specific embodiments, D1 / D2 can be 1.6, 5, 10, 15, and 18, etc.

[0093] According to some embodiments of the present application, as shown in FIGS. 4-5, 9, 12, and 15, the size of the tooth portion 21 along the circumference of the stator core 100 is equal everywhere.

[0094] 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 oriented silicon steel has high saturation magnetic induction, which can reduce the current and reduce the copper loss; and has low iron loss, which can reduce the iron loss. Therefore, the use of oriented silicon steel for the tooth portion 21 can further improve the torque and the efficiency of the motor, which is conducive to improving the performance of the motor.

[0095] It is worth noting that since the size of the tooth portion 21 along the circumference of the stator core 100 is equal everywhere, the tooth portion 21 can be made of oriented silicon steel while ensuring high performance, while for other irregularly shaped tooth portions 21, it is not possible to use oriented silicon steel without affecting performance.

[0096] In the embodiments including the first plug-in portion 211 and the second plug-in portion 212, taking the first plug-in portion 211 as an example, if the width of the first plug-in portion 211 along the circumference is equal to the width of the tooth portion 21 along the circumference, the first plug-in portion 211 is integrally formed with the tooth portion 21 and both are made of oriented silicon steel, which is more conducive to improving performance. In the case where the first plug-in portion 211 is provided with the first limiting protrusion 24 or the first limiting recess 23, since the first plug-in portion 211 does not directly cooperate with the stator winding, it can also be made of oriented silicon steel, but will not adversely affect the performance.

[0097] In some embodiments, the stator yoke 10 can be made of non-oriented silicon steel, solid magnetic component (such as bulk molding compound, BMC) or metal soft magnetic composite (SMC), etc. The stator yoke 10 is far away from the air gap between the stator assembly and the rotor assembly, and has small loss and little effect on performance improvement. Compared with oriented silicon steel, non-oriented silicon steel, solid magnetic component and metal soft magnetic composite have lower cost. Therefore, the use of the above materials for the stator yoke 10 can reduce the cost of the stator assembly without affecting the performance of the motor.

[0098] In some embodiments of the present application, as shown in FIG. 4, the side surface of the tooth shoe 22 facing the tooth portion 21 can be perpendicular to the radial extension 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 make the tooth shoe 22 achieve good limiting effect on the stator winding, and does not affect the size of the space in the stator slot, which can be as large as possible to improve the torque density and the efficiency of the motor.

[0099] In some embodiments of the present application, the stator assembly includes a plastic package, and the plastic package packages the stator core 100 and the stator winding. The plastic package can be formed by injection molding, for example, the material of the plastic package includes but is not limited to bulk molding compound (BMC) and the like.

[0100] During production, the assembled stator core 100 and stator winding can be placed in an injection mold, and then the plastic package is injected. The plastic package obtained by injection molding simultaneously realizes the plastic packaging of the stator core 100 and the stator winding, which on the one hand reduces the assembly process and improves the production efficiency, and on the other hand the plastic package can provide protection effects such as waterproof insulation for the stator core 100 and the stator winding, reducing corrosion and damage of the stator core 100 and the stator winding.

[0101] In addition, the plastic package can further fix the insertion structure of the stator core 100, such as fixing the insertion structure between the tooth portion 21 and the stator yoke 10, and fixing the insertion 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.

[0102] It is worth noting that the plastic package can wrap the stator core 100 and the stator winding, or the plastic package can wrap part of the stator core 100 and the stator winding, which are all within the protection scope of the present application.

[0103] In some embodiments of the present application, 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 tooth 20 is greater than 3 and less than 30, and the number of slots corresponding to the stator slot 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 value range, the number of poles of the rotor assembly and the number of slots of the stator assembly are more matched, which meets the application requirements of most motors.

[0104] In some embodiments, the number of stator teeth 20 Ns can be 9 or 12, and the number of poles of the rotor assembly Np can be 8, 10, 12, 14, etc.

[0105] The electrical appliance according to the embodiments of the present application comprises the motor according to the embodiments of the present application. Since the motor according to the embodiments of the present application has the beneficial technical effects described above, the electrical appliance according to the embodiments of the present application has the stator yoke 10 and the at least one of the tooth shoe 22 and the tooth portion 21 connected through the slot and the plug-in portion, which makes the assembly of the stator winding and the stator core 100 easier, improves the assembly efficiency, and the slot fill factor of the stator winding in the stator slot can be higher, thereby facilitating the improvement of the torque density and the motor operation efficiency and the improvement of the motor performance.

[0106] Here, the electrical appliance can be a household appliance such as a fan, an air conditioner compressor, a refrigerator compressor, a drum washing machine, or an electrical appliance in the field of industrial control and transportation, which are all within the protection scope of the present application.

[0107] The motor according to one of the embodiments of the present application is described in detail below with reference to the accompanying drawings, and it should be understood that the following description is only exemplary and cannot be construed as a limitation of the application.

[0108] As shown in FIGS. 1-4, the motor according to the embodiments of the present application can be applied to a compressor, and the motor comprises a stator assembly and a rotor assembly, and the rotor assembly is sleeved outside the stator assembly. The stator assembly comprises a plastic-coated body, a stator core 100, and a stator winding, the stator winding is wound around the tooth portion 21 of the stator core 100, and the plastic-coated body plastic-coats the stator core 100 and the stator winding. The stator core 100 comprises a stator yoke 10 and a stator tooth 20, the stator tooth 20 comprises an integrally connected tooth portion 21 and tooth shoe 22, the radial inner end of the tooth portion 21 is provided with a first plug-in portion 211, the outer circumferential surface of the stator yoke 10 is provided with a first slot 101, the tooth portion 21 is inserted into the first slot 101 of the stator yoke 10 through the first plug-in portion 211 in interference, and the fixation of the stator tooth 20 and the stator yoke 10 is realized by cooperating with the plastic coating of the plastic-coated body.

[0109] The cross section of the tooth portion 21 perpendicular to the axial direction of the stator core 100 is rectangular, 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, i.e., the radial direction of the tooth portion 21. The inner side surface of the tooth shoe 22 facing the tooth portion 21 extends perpendicular to the radial direction of the tooth portion 21. The stator yoke 10 is made of non-oriented silicon steel.

[0110] The motor of the above-mentioned embodiment has high slot fill factor of the stator winding in the stator slot, which is conducive to improving the torque density and the motor operation efficiency, and the oriented silicon steel is used to further improve the torque, reduce the copper loss and the iron loss, and further improve the efficiency.

[0111] Other configurations and operations of the motor and the electrical appliance according to the embodiments of the present application are known to those skilled in the art, and will not be described in detail herein.

[0112] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the communication inside two elements. 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.

[0113] In the description of the present application, the description referring to the terms "embodiment", "specific embodiment", "example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description 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.

[0114] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A stator core, wherein, Comprising: a stator yoke; a plurality of stator teeth, the stator teeth comprising a tooth portion extending radially from the stator yoke and a tooth shoe, wherein an inner or outer circumferential surface of the stator yoke is provided with a plurality of first insertion slots spaced along a circumferential direction of the stator yoke, one end of the tooth portion is provided with a first insertion portion which is inserted into the first insertion slot, and / or the tooth shoe is provided with a second insertion slot, the other end of the tooth portion is provided with a second insertion portion which is inserted into the second insertion slot.

2. The stator core of claim 1, wherein, The shape of the first insertion slot matches the shape of the first insertion portion, and the outer surface of the first insertion portion is clearance fit, transition fit or interference fit with the slot wall surface of the first insertion slot.

3. The stator core of claim 2, wherein the circumferential dimension of the first insertion portion along the stator yoke is equal to the circumferential dimension of the tooth portion along the stator yoke; or one of the circumferential side surface of the first insertion portion along the stator yoke and the slot side wall of the first insertion slot is provided with a first limiting recess, and the other is provided with a first limiting protrusion embedded in the first limiting recess; or the circumferential dimension of the first insertion portion along the stator yoke decreases in the direction away from the tooth shoe.

4. The stator core of any one of claims 1-3, wherein, The shape of the second insertion slot matches the shape of the second insertion portion, and the outer surface of the second insertion portion is clearance fit, transition fit or interference fit with the slot wall surface of the second insertion slot.

5. The stator core of claim 4, wherein the circumferential dimension of the second insertion portion along the stator yoke is equal to the circumferential dimension of the tooth portion along the stator yoke; or one of the circumferential side surface of the second insertion portion along the stator yoke and the slot side wall of the second insertion slot is provided with a second limiting recess, and the other is provided with a second limiting protrusion embedded in the second limiting recess; or the circumferential dimension of the second insertion portion along the stator yoke decreases in the direction away from the stator yoke.

6. The stator core of any one of claims 1-5, wherein, The stator yoke comprises a yoke body and a plurality of yoke protrusions, the yoke body is annular structure, a plurality of yoke protrusions are spaced along the circumferential direction of the yoke body, and the first insertion slot is defined between adjacent two yoke protrusions, The maximum radial dimension of the stator yoke is d1, and the radial thickness of the yoke body is d2, d1 / d2 is greater than 1 and less than or equal to 9.

5.

7. The stator core of any one of claims 1-6, wherein, The stator yoke comprises a yoke body and a plurality of yoke protrusions, the yoke body is annular structure, a plurality of yoke protrusions are spaced along the circumferential direction of the yoke body, and the first insertion slot is defined between adjacent two yoke protrusions, The circumferential dimension of the yoke protrusion close to the yoke body along the stator yoke is W1, and the circumferential dimension of the yoke protrusion away from the yoke body along the stator yoke is W2, W2 / W1 is greater than or equal to 0.5 and less than or equal to 11.

5.

8. The stator core of any one of claims 1-7, wherein, 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 of any of claims 1-8, wherein, The size of the tooth portion along the circumferential direction of the stator core is equal everywhere.

10. The stator core of claim 9, wherein, 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 of any of claims 1-10, wherein, The stator yoke portion is non-oriented silicon steel, a solid magnetic component, or a metal soft magnetic composite material.

12. The stator core of any of claims 1-11, wherein, The side surface of the tooth shoe facing the tooth portion extends perpendicularly to the radial direction of the stator yoke portion; or the side surface of the tooth shoe facing the tooth portion is an arc surface, and the central axis of the arc surface coincides with the axis of the stator yoke portion.

13. A stator assembly, wherein, The motor comprises a stator winding and a stator core according to any one of claims 1-12, and the stator winding is wound around the tooth portion.

14. The stator assembly of claim 13, wherein, The motor comprises a plastic body, and the plastic body plasticizes the stator core and the stator winding.

15. An electric machine, wherein, The motor comprises a rotor assembly and a stator assembly according to claim 13 or 14.

16. The electric machine of claim 15, wherein, 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 tooth 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 appliance wherein, The motor according to claim 15 or 16.

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