Stator core, motor and electric appliance

Abstract

The utility model discloses a stator core, a motor and an electric appliance, and the stator core comprises a stator core yoke which is in the shape of a ring with an inner cavity, and the inner ring of the stator core yoke is provided with a plurality of installation parts at intervals along the circumferential direction; the stator core teeth are located in the inner cavity, the stator core teeth comprise a plurality of independent single teeth, the single teeth and the mounting parts are assembled and connected in a one-to-one mode, and a notch is formed between the free ends of any two adjacent single teeth. According to the technical scheme of the utility model, the motor can realize an external winding process, the winding efficiency is improved, and magnetic leakage and additional electromagnetic noise caused by closing of a magnetic circuit can be avoided at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a stator core, a motor and an electrical appliance. Background Art

[0002] Traditional AC motor stators generally use an integral iron core, which needs to be wound through an inner winding process. Therefore, the slot size Sw of the stator core is usually greater than or equal to 2mm. The increase in the slot size leads to an increase in the equivalent air gap δ of the motor, which increases the air gap magnetic resistance of the motor and reduces the energy efficiency of the motor. At the same time, the inner winding speed of the motor generally does not exceed 1400rpm, and the winding efficiency is very low.

[0003] In the related art, some motor stators change the integral iron core into a tooth-yoke separation structure, but all adopt an integral tooth and yoke structure, and the teeth are connected as a whole through slots. Due to the slot connection, the magnetic circuit will be partially short-circuited and closed, resulting in magnetic field distortion and leakage, which will reduce the output capacity of the motor and generate additional electromagnetic noise. In order to weaken this effect, some schemes adopt partial connection of the teeth (axial partial sheet connection), which also leads to the complexity of the mold and the presence of two types of punching sheets, but these defects cannot be completely eliminated, especially when there are too many sheets connected, the noise and leakage are serious, and when there are too few connections, the strength is not enough and it is easy to deform. Utility Model Content

[0004] The main purpose of the utility model is to provide a stator core, which aims to enable the motor to realize the external winding process, improve the winding efficiency, and avoid magnetic leakage and additional electromagnetic noise caused by the closure of the magnetic circuit.

[0005] In order to achieve the above-mentioned purpose, the stator core proposed by the utility model comprises:

[0006] The stator core yoke is in a ring shape with an inner cavity, and the inner ring of the stator core yoke is provided with a plurality of mounting parts at intervals along the circumferential direction; and

[0007] The stator core teeth are located in the inner cavity. The stator core teeth include a plurality of mutually independent single teeth. The single teeth are assembled and connected to the mounting portion one-to-one. A notch is formed between the free ends of any two adjacent single teeth.

[0008] In one of the embodiments, a mounting portion is provided at one end of the single tooth, one of the mounting portion and the mounting portion is provided with a mounting groove, and the other is at least partially embedded in the mounting groove.

[0009] In one embodiment, the mounting portion is provided with the mounting groove, and the mounting groove has an opening open toward the inner cavity, and each of the single teeth is embedded in the corresponding mounting groove through the assembly portion.

[0010] In one embodiment, the depth dimension of the installation groove is L1, and the dimension of the assembly portion in the groove depth direction of the installation groove is L2, wherein L2 is greater than L1.

[0011] In one embodiment, the difference between L2 and L1 is greater than or equal to 0.3 mm.

[0012] In one embodiment, the mounting groove includes a first groove body and a second groove body arranged along the depth direction thereof, the first groove body is located on a side of the second groove body close to the opening, and the width dimension of the first groove body is smaller than the width dimension of the second groove body; the assembly portion includes a first assembly portion that is engaged with the first groove body and a second assembly portion that is engaged with the second groove body, and the width dimension of the first assembly portion is smaller than the width dimension of the second assembly portion.

[0013] In one embodiment, the width dimension of the slot is Sw, wherein Sw is not less than 0.4 mm and not more than 1.5 mm.

[0014] In one embodiment, the shapes and sizes of the plurality of monomeric teeth are the same.

[0015] The utility model also provides a motor, comprising the stator core as described above.

[0016] The utility model also provides an electrical appliance, comprising the motor as described above.

[0017] The technical solution of the utility model adopts a separate structure for the stator core yoke and the stator core teeth. The stator core teeth include multiple independent single teeth. The single teeth can be wound first and then assembled and connected with the mounting part of the stator core yoke. In this way, when it is applied to the motor, the motor can adopt the block motor outer winding process, so that the winding speed is increased from a maximum of 1400rpm to a maximum of 7000rpm, and the winding efficiency is greatly improved. In addition, the stator core teeth are formed by a combination of multiple independent single teeth, and a notch is formed between the free ends of any two adjacent single teeth, so that the size of the notch can be adjusted in a wide range according to the design requirements, which can improve the energy efficiency of the motor; and the complete disconnection of the notch avoids magnetic leakage and additional electromagnetic noise caused by the closure of the magnetic circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1 This is a structural schematic diagram of an embodiment of a stator core of the utility model;

[0020] Figure 2 for Figure 1 The structural diagram of the stator core yoke;

[0021] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0022] Figure 4 for Figure 1 Schematic diagram of the structure of the stator core teeth;

[0023] Figure 5 for Figure 4 Schematic diagram of the structure of one of the monomer teeth.

[0024] Description of Figure Numbers:

[0025] Label name Label name 100 Stator core 20 Stator core teeth 10 Stator core yoke 21 Monomer tooth 101 Inner cavity 211 Assembly Department 11 Mounting slot 2111 First assembly department 111 The first tank 2112 Second assembly department 112 Second tank 22 notch

[0026] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0029] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0030] The utility model provides a stator core 100 .

[0031] Please refer to Figures 1 to 5 In one embodiment of the utility model, the stator core 100 includes a stator core yoke 10 and a stator core tooth 20. The stator core yoke 10 is annular with an inner cavity 101, and the inner ring of the stator core yoke 10 is provided with a plurality of mounting portions at intervals along the circumferential direction; the stator core tooth 20 is located in the inner cavity 101, and the stator core tooth 20 includes a plurality of mutually independent single teeth 21, and the single teeth 21 are assembled and connected with the mounting portions one by one, and a notch 22 is formed between the free ends of any two adjacent single teeth 21.

[0032] The stator core 100 is used for a motor stator, and the motor stator may include a plurality of stacked stator cores 100 and a coil winding wound around stator core teeth 20. Taking a single-piece stator core 100 as an example, the single-piece stator core 100 includes a stator core yoke 10 and stator core teeth 20.

[0033] The stator core yoke 10 is arranged in a ring shape, and can be a square ring, a circular ring or other special-shaped ring, which is not specifically limited here. Figure 2As shown, in this embodiment, the inner ring of the stator core yoke 10 is polygonal (for example, a regular octagon), and the outer ring of the stator core yoke 10 is generally square. The stator core yoke 10 can be an integrated annular structure, or a block-type annular structure. Optionally, the stator core yoke 10 adopts an integrated annular structure, which can simplify the manufacturing process and ensure the structural strength. The stator core yoke 10 can be used to install the stator core teeth 20 and the motor end cover components, and provide a magnetic circuit at the same time. The number of mounting parts of the stator core yoke 10 is the same as the number of single teeth 21 of the stator core teeth 20, and the specific number can be set according to actual needs. The stator core yoke 10 and the multiple single teeth 21 can be integrally formed by sleeve cutting and stamping. Exemplarily, for a 4-pole AC induction motor, it is composed of main and auxiliary windings, with 8 slots and 8 teeth. Accordingly, the stator core teeth 20 include 8 single teeth 21, and the inner ring of the stator core yoke 10 is provided with 8 mounting parts at intervals along the circumferential direction.

[0034] The assembly connection between the single tooth 21 and the mounting part means that the single tooth 21 is an independent structure relative to the mounting part of the stator core yoke 10 before assembly, and the two need to be connected together through the assembly structure. Such a design is conducive to winding the single tooth 21 through the external winding process, and then assembling the single tooth 21 with the stator core yoke 10. Among them, there are many ways of assembly connection between the single tooth 21 and the mounting part, including but not limited to connecting and fixing by means of embedding, welding, riveting, etc., which are not specifically limited here. One end of the single tooth 21 is connected to the mounting part of the stator core yoke 10, and the other end of the single tooth 21 is the free end. When a plurality of single teeth 21 are respectively assembled with the stator core yoke 10, the free ends of the plurality of single teeth 21 are enclosed to form an annular structure, and the free ends of any two adjacent single teeth 21 are disconnected from each other to form a notch 22, and the size of the notch 22 can be adjusted in a wide range according to design requirements.

[0035] The technical solution of the utility model is to adopt a separate structure for the stator core yoke 10 and the stator core teeth 20. The stator core teeth 20 include a plurality of independent single teeth 21. The single teeth 21 can be wound first and then assembled and connected with the mounting part of the stator core yoke 10. In this way, when it is applied to the motor, the motor can adopt the block motor outer winding process, so that the winding speed is increased from a maximum of 1400rpm to a maximum of 7000rpm, and the winding efficiency is greatly improved. In addition, the stator core teeth 20 are formed by combining a plurality of independent single teeth 21, and a notch 22 is formed between the free ends of any two adjacent single teeth 21, so that the size of the notch 22 can be adjusted in a wide range according to the design requirements, which can improve the energy efficiency of the motor. In addition, the notch 22 is completely disconnected to avoid magnetic leakage and additional electromagnetic noise caused by the closure of the magnetic circuit.

[0036] In order to simplify the assembly process of the single tooth 21 and the stator core yoke 10, as shown in FIG. Figure 2 and Figure 5 As shown, in one embodiment, a mounting portion 211 is provided at one end of the single tooth 21, one of the mounting portion and the mounting portion 211 is provided with a mounting groove 11, and the other is at least partially embedded in the mounting groove 11. For example, the mounting portion may be provided with a mounting groove 11, and the mounting portion 211 of the single tooth 21 is at least partially embedded in the mounting groove 11 of the mounting portion. Alternatively, the mounting portion 211 may be provided with a mounting groove 11, and the mounting portion of the stator core yoke 10 may be at least partially embedded in the mounting groove 11 of the mounting portion 211.

[0037] Considering that the size of the single tooth 21 is small, it is not convenient to open the installation groove 11. In order to further simplify the manufacturing process, in one embodiment, the installation portion is provided with the installation groove 11, and the installation groove 11 has an opening open to the inner cavity 101, and each single tooth 21 is embedded in the corresponding installation groove 11 through the assembly portion 211. In this embodiment, since the size of the stator core yoke 10 is relatively large, it is very convenient to open the installation groove 11 on the installation portion, and the size of the installation groove 11 can also be designed to be larger as needed, so that the installation reliability of the single tooth 21 and the stator core yoke 10 can be further improved.

[0038] In order to ensure that the single tooth 21 can be smoothly pressed into the installation groove 11 of the stator core yoke 10 after the winding is completed, as shown in FIG. Figure 2 and Figure 5 As shown, in one embodiment, the depth dimension of the mounting groove 11 is L1, and the dimension of the assembly portion 211 in the groove depth direction of the mounting groove 11 is L2, wherein L2 is greater than L1. Optionally, the difference between L2 and L1 is greater than or equal to 0.3 mm. That is, L2-L1≥0.3mm. In this way, the assembly reliability of the single tooth 21 and the stator core yoke 10 can be further ensured.

[0039] Please combine Figures 1 to 3 , Figure 5 In one embodiment, the mounting groove 11 includes a first groove body 111 and a second groove body 112 arranged along the depth direction thereof, the first groove body 111 is located on the side of the second groove body 112 close to the opening, and the width dimension of the first groove body 111 is smaller than the width dimension of the second groove body 112; the assembly portion 211 includes a first assembly portion 2111 that is engaged with the first groove body 111, and a second assembly portion 2112 that is engaged with the second groove body 112, and the width dimension of the first assembly portion 2111 is smaller than the width dimension of the second assembly portion 2112.

[0040] In this embodiment, the first assembly portion 2111 is embedded in the first slot body 111, and the second assembly portion 2112 is embedded in the second slot body 112. Since the width dimension of the first slot body 111 is smaller than the width dimension of the second slot body 112, the width dimension of the mounting slot 11 close to the opening side is relatively small, thereby limiting the movement of the second assembly portion 2112 toward the opening direction, thereby preventing the assembly portion 211 from escaping from the opening of the mounting slot 11 under the action of external force, which is beneficial to improving the assembly reliability of the single tooth 21 and the stator core yoke 10.

[0041] Optionally, two side groove walls opposite to each other in the width direction of the second groove body 112 are arranged in a concave arc, and two sides in the width direction of the second assembly portion 2112 are arranged in a convex arc adapted to the concave arc. In this way, the second assembly portion 2112 and the side groove walls of the second groove body 112 can form a larger contact area, which is conducive to further improving assembly reliability.

[0042] like Figure 1 As shown, in one embodiment, the width dimension of the slot 22 is Sw, wherein Sw is not less than 0.4 mm and not more than 1.5 mm. The width dimension of the slot 22 refers to the gap between the free ends of two adjacent single teeth 21 in the circumferential direction of the stator core tooth 20.

[0043] In this embodiment, Sw is greater than or equal to 0.4 mm, so that the width of the slot 22 will not be too small, and leakage magnetic flux and additional electromagnetic noise caused by magnetic circuit closure can be avoided. In addition, since the multiple single teeth 21 of the stator core teeth 20 are independent structures, an external winding process can be adopted, so the width of the slot 22 can be designed to be relatively small, and the winding efficiency will not be affected. The slot 22 size Sw of the traditional integral stator core 100 is usually greater than or equal to 2 mm. The increase in the size of the slot 22 causes the motor equivalent air gap δ to increase, which increases the motor air gap magnetic resistance and reduces the motor energy efficiency. The Sw of this solution is less than or equal to 1.5 mm, which can reduce the impact of the increase in the equivalent air gap caused by the slot 22, avoid the increase in the motor air gap magnetic resistance, and ensure the motor energy efficiency. Among them, 0.4 mm ≤ Sw ≤ 1.5 mm. For example, Sw can be 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, etc.

[0044] In order to further improve production efficiency, based on any of the above embodiments, in one embodiment, the shapes and sizes of the multiple single teeth 21 are the same. That is, the multiple single teeth 21 of the stator core teeth 20 are completely the same in shape and size, so that multiple single teeth 21 with the same shape can be punched out at one time through the same set of dies, and the main and auxiliary cores have completely symmetrical structures, and there is no need to distinguish directions during the production process, which is conducive to realizing automated production, improving production efficiency, and reducing production costs.

[0045] In the actual production process, a stamping die can be used to stamp and form the stator core yoke 10 and multiple single teeth 21 of the stator core teeth. In order to ensure that the stator core teeth 20 and the stator core yoke 10 have sufficient structural strength after being combined and are easy to press together, the gap between the male and female dies of the stamping die can be designed to be 0.015mm to 0.05mm.

[0046] The utility model also provides a motor, which includes a stator core 100. The specific structure of the stator core 100 refers to the above embodiment. Since the motor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0047] The utility model also provides an electrical appliance, which includes a motor. The motor includes a stator core 100. The specific structure of the stator core 100 refers to the above embodiment. Since the electrical appliance adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. Among them, the electrical appliance includes but is not limited to a fan, a blower, a compressor or other electrical appliances with the above motor, etc.

[0048] The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A stator core, characterized in that: include: The stator core yoke is in a ring shape with an inner cavity, and the inner ring of the stator core yoke is provided with a plurality of mounting parts at intervals along the circumferential direction; and The stator core teeth are located in the inner cavity. The stator core teeth include a plurality of mutually independent single teeth. The single teeth are assembled and connected to the mounting portion one-to-one. A notch is formed between the free ends of any two adjacent single teeth.

2. The stator core according to claim 1, characterized in that: An assembly portion is provided at one end of the single tooth, one of the assembly portion and the installation portion is provided with an installation groove, and the other is at least partially embedded in the installation groove.

3. The stator core according to claim 2, characterized in that: The mounting portion is provided with the mounting groove, and the mounting groove has an opening open toward the inner cavity. Each of the single teeth is embedded in the corresponding mounting groove through the assembling portion.

4. The stator core according to claim 3, characterized in that: The depth dimension of the installation groove is L1, and the dimension of the assembly portion in the groove depth direction of the installation groove is L2, wherein L2 is greater than L1.

5. The stator core according to claim 4, characterized in that: The difference between L2 and L1 is greater than or equal to 0.3 mm.

6. The stator core according to claim 3, characterized in that: The mounting groove includes a first groove body and a second groove body arranged along its depth direction, the first groove body is located on a side of the second groove body close to the opening, and the width dimension of the first groove body is smaller than the width dimension of the second groove body; the assembly part includes a first assembly part that is embedded in the first groove body, and a second assembly part that is embedded in the second groove body, and the width dimension of the first assembly part is smaller than the width dimension of the second assembly part.

7. The stator core according to claim 1, characterized in that: The width dimension of the notch is Sw, wherein Sw is not less than 0.4 mm and not more than 1.5 mm.

8. The stator core according to any one of claims 1 to 7, characterized in that: The shapes and sizes of the plurality of single teeth are the same.

9. A motor, characterized in that: Comprising the stator core according to any one of claims 1 to 8.

10. An electrical appliance, characterized in that: Comprising the motor as claimed in claim 9.

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