Stator core and motor

Abstract

The utility model provides a stator core and a motor, and relates to the technical field of motors. The stator iron core comprises an iron core body, first stator teeth and second stator teeth; the first stator teeth and the second stator teeth are arranged in the radial direction of the iron core body, are the same in number, correspond to each other and are detachably connected. Before the winding is embedded, the second stator teeth are separated from the first stator teeth, a first tooth groove is formed between every two adjacent first stator teeth, and winding wire embedding is facilitated like an open groove scheme. After the winding is embedded, the second stator teeth are connected with the first stator teeth, a second tooth groove is formed between two adjacent second stator teeth or between the first stator teeth and the second stator teeth, and the width of one end, far away from the first tooth groove, of each second tooth groove is smaller than that of one end, close to the first tooth groove, of each second tooth groove, so that an air gap tooth groove harmonic magnetic field can be effectively reduced; and the effective air gap length of the motor is reduced, so that the efficiency and the power factor of the motor are improved, and the same effect as a semi-open slot / semi-closed slot / closed slot scheme is realized.

Description

Technical Field

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

[0002] A high-voltage motor refers to a motor with a rated voltage of more than 1000V. Its winding uses a formed coil, which is generally a flat copper wire wrapped with insulating material and then wound and stretched. Since the entire formed coil edge needs to be embedded into the slot from the inner circle of the core, the core slot of the high-voltage motor is usually an open slot, which is different from the semi-closed slot and semi-open slot of the low-voltage loose-wire motor. The disadvantage is that the air gap tooth harmonic magnetic field is too large, which produces pulsation and harmonic loss, which in turn leads to increased rotor temperature rise, reduced motor efficiency and increased electromagnetic vibration noise. In addition, the open slot increases the effective air gap length of the motor, which increases the excitation reactive power for the electrically excited motor and reduces the motor power factor. For permanent magnet motors, the consumption of permanent magnets is increased. Utility Model Content

[0003] In order to solve the problems existing in the prior art, one of the purposes of the utility model is to provide a stator core.

[0004] The utility model provides the following technical solutions:

[0005] A stator core, the stator core having a first tooth slot and a second tooth slot, the stator core comprising:

[0006] An iron core body, wherein the iron core body is arranged in a ring shape;

[0007] A first stator tooth is arranged along the radial direction of the core body, a plurality of the first stator teeth are arranged, and the plurality of the first stator teeth are fixedly arranged on the inner side wall of the core body; and

[0008] Second stator teeth are arranged along the radial direction of the core body, the number of the second stator teeth is the same as and corresponds to the number of the first stator teeth, and the second stator teeth are detachably connected to the corresponding first stator teeth;

[0009] Among them, the first tooth slot is located between two adjacent first stator teeth, the first tooth slot is used to accommodate the winding, the second tooth slot is located between two adjacent second stator teeth, or between the first stator tooth and the second stator tooth, the second tooth slot is connected to the first tooth slot, and the width of the second tooth slot at one end away from the first tooth slot is smaller than the width of the second tooth slot at one end close to the first tooth slot.

[0010] As a further optional solution for the stator core, one end of the second stator tooth close to the core body is detachably connected to one end of the corresponding first stator tooth away from the core body, and the second tooth slot is located between two adjacent second stator teeth.

[0011] As a further optional solution for the stator core, the first stator tooth includes a first tooth portion and a second tooth portion, the first tooth portion and the second tooth portion are arranged along a radial direction of the core body, and the first tooth portion is located between the second tooth portion and the core body, and the first tooth slot is located between the first tooth portions of two adjacent first stator teeth;

[0012] The second stator tooth is located at one side of the second tooth portion of the corresponding first stator tooth along the circumferential direction of the core body, and the second tooth slot is located between the second stator tooth and the second tooth portion of the adjacent first stator tooth.

[0013] As a further optional solution for the stator core, the stator core further includes a third stator tooth, the third stator tooth is arranged along the radial direction of the core body, the third stator tooth is fixedly arranged on the inner side wall of the core body, and the third stator tooth and the first stator tooth are alternately arranged along the circumferential direction of the core body;

[0014] The first tooth slot is located between the third stator tooth and the first stator tooth, and the second tooth slot is located between the third stator tooth and the second stator tooth.

[0015] As a further optional solution for the stator core, the stator core further includes a magnetic bridge, which is located between two adjacent second stator teeth and connects the two second stator teeth at the same time.

[0016] As a further optional solution for the stator core, the plurality of second stator teeth are divided into at least two groups, and the second stator teeth in the same group are sequentially connected via the magnetic bridge.

[0017] As a further optional solution for the stator core, a fastening layer is wound around the connection between the second stator tooth and the corresponding first stator tooth.

[0018] As a further optional solution for the stator core, the side walls of the second tooth slots are provided with first grooves in pairs;

[0019] The stator core further includes a first slot wedge, and the first slot wedge is embedded in the first groove.

[0020] As a further optional solution for the stator core, one of the first stator tooth and the second stator tooth is provided with a clamping portion, and the other of the first stator tooth and the second stator tooth is provided with a clamping groove, and the clamping portion is engaged with the clamping groove.

[0021] Another object of the utility model is to provide a motor.

[0022] The utility model provides the following technical solutions:

[0023] A motor comprises a winding and the above-mentioned stator core, wherein the winding is embedded in the first tooth slot.

[0024] The embodiments of the present invention have the following beneficial effects:

[0025] In the above-mentioned stator core, the first stator tooth is fixedly arranged on the core body, and the second stator tooth is detachably connected to the first stator tooth. Before embedding the winding, the second stator tooth is separated from the first stator tooth, and a first tooth slot for accommodating the winding is formed between two adjacent first stator teeth, which is convenient for winding embedding as in the open slot scheme. After embedding the winding, the second stator tooth is connected to the first stator tooth, and a second tooth slot is formed between two adjacent second stator teeth, or between the first stator tooth and the second stator tooth, and the width of the second tooth slot away from the end of the first tooth slot is smaller than the width of the second tooth slot close to the end of the first tooth slot, which can effectively reduce the air gap tooth slot harmonic magnetic field and reduce the effective air gap length of the motor, thereby improving the motor efficiency and power factor, and achieving the same effect as the semi-open slot / semi-closed slot / closed slot scheme.

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 The figure shows a schematic diagram of the overall structure of a stator core provided in Embodiment 1 of the present utility model;

[0029] Figure 2 A partial structural schematic diagram of a stator core provided in Example 1 of the utility model is shown;

[0030] Figure 3The schematic diagram of the structure of the second stator tooth in the stator core provided by Example 1 of the utility model in some specific implementations is shown;

[0031] Figure 4 The schematic diagrams of the structures of the second stator teeth in the stator core provided in Embodiment 1 of the utility model in other specific implementations are shown;

[0032] Figure 5 The figure shows a schematic diagram of the overall structure of a stator core provided by Embodiment 2 of the present utility model;

[0033] Figure 6 A partial structural schematic diagram of a stator core provided in Example 2 of the utility model is shown;

[0034] Figure 7 A schematic structural diagram of a second stator tooth in a stator core provided by Example 2 of the utility model in some specific implementations is shown;

[0035] Figure 8 The schematic diagrams of the structures of the second stator teeth in the stator core provided in Embodiment 2 of the present utility model in other specific implementations are shown;

[0036] Fig. 9 The figure shows a schematic diagram of the overall structure of a stator core provided in Embodiment 3 of the present utility model;

[0037] Fig.10 A partial structural schematic diagram of a stator core provided in Embodiment 3 of the present utility model is shown;

[0038] Fig.11 A schematic diagram showing the connection relationship between the second stator tooth and the magnetic bridge in a stator core provided by Embodiment 4 of the utility model is shown;

[0039] Fig.12 A schematic diagram showing the connection relationship between the second stator tooth and the magnetic bridge in a stator core provided by Embodiment 4 of the utility model is shown;

[0040] Fig.13 A schematic diagram showing the connection relationship between the second stator tooth and the magnetic bridge in a stator core provided by Embodiment 4 of the utility model is shown;

[0041] Fig.14 A schematic diagram showing the connection relationship between the second stator tooth and the magnetic bridge in a stator core provided by Embodiment 4 of the utility model is shown;

[0042] Fig.15 A schematic diagram showing the connection relationship between the second stator tooth and the magnetic bridge in a stator core provided by Embodiment 4 of the utility model is shown;

[0043] Fig.16The figure shows a schematic diagram of the overall structure of a stator core provided by Embodiment 5 of the present utility model;

[0044] Fig.17 A schematic diagram of the partial structure of a stator core provided in Example 5 of the utility model is shown.

[0045] Description of main component symbols:

[0046] 10- stator core; 20- winding; 10a- first tooth slot; 10b- second tooth slot; 10c- first groove; 10d- second groove; 100- core body; 200- first stator tooth; 201- clamping part; 210- first tooth part; 220- second tooth part; 300- second stator tooth; 301- clamping groove; 400- first slot wedge; 500- second slot wedge; 600- third stator tooth; 700- magnetic bridge; 800- fastening layer. 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] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0049] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of the template herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0052] In the related art, in order to solve the problems of excessive harmonic magnetic field of air gap slots and increased effective air gap length caused by the core slots of high-voltage motors being designed as open slots, one design solution is to install magnetic slot wedges at the slots.

[0053] The magnetic slot wedge is made by adding reducing iron powder evenly to the resin, and then using alkali-free glass fiber cloth to reinforce and hot-press it into a magnetic plate. Its relative magnetic permeability is about 3-10. The magnetic slot wedge fills the slot opening, making the air gap magnetic permeability continuous along the circumferential direction, reducing the air gap tooth harmonic magnetic field, and reducing the equivalent air gap length, thereby reducing the excitation current of the electromagnetic motor, improving the power factor, reducing the amount of permanent magnets used in the permanent magnet motor, reducing the rotor eddy current loss and temperature rise, and reducing electromagnetic noise and vibration.

[0054] However, during the long-term operation of the motor, the magnetic slot wedge is at risk of falling off. The alternating main magnetic flux and leakage magnetic flux pass through the magnetic slot wedge. Under the action of the magnetic flux, the magnetic slot wedge will be subjected to electromagnetic pulling force in the motor magnetic field. This force will directly destroy the magnetic slot wedge and cause "mechanical corrosion" of the magnetic slot wedge. In addition, the local discharge generated at the weak point of insulation will cause "electrical corrosion" to the magnetic slot wedge. Both of these will affect the service life of the magnetic slot wedge.

[0055] In addition, another design scheme is to design the stator punching sheet into a semi-open slot structure, and divide the winding into two groups of coils along the width direction, so that the single coil is embedded into the iron core from the semi-open slot in turn. The semi-open slot reduces the slot opening and reduces the magnetic permeance harmonics caused by the stator side opening.

[0056] However, the number of coils in the semi-open slot solution is doubled, which increases the coil manufacturing cost and wire embedding time, and the effective slot utilization area is lost in the slot width direction because the width occupied by the insulation is doubled. Especially when applied to high-speed motors, the slot width is small due to the small stator size and the use of a multi-slot design to reduce harmonics. At this time, the total insulation width of the two coils accounts for a further increase in the proportion of the slot width, that is, the slot fill rate is very low. This not only increases the resistance of the winding and increases the copper loss of the winding, but also the high proportion of insulation material also causes the equivalent thermal conductivity of the entire winding to decrease, which in turn increases the temperature rise of the winding and reduces the insulation life.

[0057] Therefore, the above two design solutions cannot effectively solve the problems caused by the core slot design of the high-voltage motor as an open slot, and have obvious defects.

[0058] Example 1

[0059] Please also read Figure 1 and Figure 2 The present embodiment provides a stator core 10 , which has a first tooth slot 10 a and a second tooth slot 10 b , and the stator core 10 includes a core body 100 , a first stator tooth 200 , and a second stator tooth 300 .

[0060] Specifically, the core body 100 is arranged in a ring shape, and the first stator teeth 200 and the second stator teeth 300 are both arranged along the radial direction of the core body 100 .

[0061] A plurality of first stator teeth 200 are provided, and the plurality of first stator teeth 200 are all fixedly disposed on the inner side wall of the core body 100 and are evenly arranged along the circumferential direction of the core body 100 .

[0062] The number of the second stator teeth 300 is the same as and corresponds to the first stator teeth 200 , and the second stator teeth 300 are detachably connected to the corresponding first stator teeth 200 .

[0063] The first tooth slot 10a is located between two adjacent first stator teeth 200 and is used to accommodate the winding 20. The second tooth slot 10b is located between two adjacent second stator teeth 300, or between the first stator tooth 200 and the second stator tooth 300.

[0064] In addition, the second tooth groove 10b is connected to the first tooth groove 10a. The width of the second tooth groove 10b at one end away from the first tooth groove 10a is smaller than the width of the second tooth groove 10b at one end close to the first tooth groove 10a.

[0065] Before embedding the winding 20 , the second stator teeth 300 are separated from the first stator teeth 200 , and a first tooth slot 10 a for accommodating the winding 20 is formed between two adjacent first stator teeth 200 , which is convenient for embedding the winding 20 as in the open slot solution.

[0066] After embedding the winding 20, the second stator tooth 300 is connected to the first stator tooth 200, and a second tooth slot 10b is formed between two adjacent second stator teeth 300, or between the first stator tooth 200 and the second stator tooth 300, and the width of the second tooth slot 10b away from the end of the first tooth slot 10a is smaller than the width of the second tooth slot 10b close to the end of the first tooth slot 10a, which can effectively reduce the air gap tooth harmonic magnetic field and reduce the effective air gap length of the motor, thereby improving the motor efficiency and power factor, and achieving the same effect as the semi-open slot / semi-closed slot / closed slot solution.

[0067] Optionally, the first stator tooth 200 is formed integrally with the core body 100 .

[0068] Optionally, the second stator teeth 300 are made of oriented silicon steel material.

[0069] It can be understood that the stator core 10 is generally made of a plurality of silicon steel sheets stacked in the thickness direction, and the second stator teeth 300 are the same.

[0070] Exemplarily, the second stator teeth 300 can be formed into blocks by gluing self-adhesive silicon steel sheets or non-self-adhesive silicon steel sheets, or by riveting punching sheets with self-fastening points, or by laser welding after stacking punching sheets.

[0071] Among them, the preferred solution is to use self-adhesive silicon steel sheets or non-self-adhesive silicon steel sheets to bond them into blocks by applying glue. Bonding is more solid than other bonding methods, and the sheets are insulated and non-conductive, with minimal loss.

[0072] Furthermore, the second stator tooth 300 may be composed of multiple pieces along the axial direction of the core body 100. By reducing the size of a single piece in the stacking thickness direction (ie, the axial direction of the core body 100), the requirement for the straightness of the second stator tooth 300 is reduced.

[0073] Furthermore, the dimension of the second stator tooth 300 in the stacking thickness direction may be slightly smaller than that of the first stator tooth 200 , so as to prevent the second stator teeth 300 protruding at both ends from being peeled off.

[0074] Furthermore, pressure plates may be added at both ends of the stator core 10 to axially press the second stator teeth 300 , thereby further enhancing the overall strength and preventing the second stator teeth 300 from being peeled off at both ends.

[0075] In some embodiments, the second stator teeth 300 and the corresponding first stator teeth 200 are arranged along the radial direction of the core body 100, and the end of the second stator teeth 300 close to the core body 100 is detachably connected to the end of the corresponding first stator teeth 200 away from the core body 100. At this time, the second tooth slot 10b is located between two adjacent second stator teeth 300.

[0076] Optionally, the width of the first stator tooth 200 gradually decreases in the direction away from the core body 100, while the width of the first tooth slot 10a between two adjacent first stator teeth 200 remains unchanged, and the width of the first tooth slot 10a is equal to the sum of the width of the winding 20 and the wire gap.

[0077] Correspondingly, along the direction away from the core body 100 , the width of the second stator teeth 300 gradually increases, and the width of the second tooth slot 10 b between two adjacent second stator teeth 300 gradually decreases.

[0078] In some embodiments, one of the first stator tooth 200 and the second stator tooth 300 is provided with a clamping portion 201, and the other of the first stator tooth 200 and the second stator tooth 300 is provided with a clamping slot 301. The clamping portion 201 is engaged with the clamping slot 301, so that the first stator tooth 200 and the second stator tooth 300 are detachably connected.

[0079] Exemplarily, a clamping portion 201 is provided on the end surface of the first stator tooth 200 away from the core body 100, and a clamping groove 301 is provided on the end surface of the second stator tooth 300 close to the core body 100, and the clamping portion 201 is clamped into the clamping groove 301 along the axial direction of the core body 100.

[0080] In addition, the slot width of the slot 301 is smaller than the maximum width of the slot 301 , and the holding portion 201 cannot escape from the slot 301 along the radial direction of the core body 100 , so that the first stator tooth 200 and the second stator tooth 300 are detachably connected.

[0081] Please combine Figure 3 and Figure 4 Optionally, the inner wall of the slot 301 may be arc-shaped or polygonal, and the outer wall of the holding portion 201 matches the inner wall of the slot 301 .

[0082] In some embodiments, the side walls of the second tooth slots 10 b are provided with first grooves 10 c in pairs, that is, the first grooves 10 c are provided on the opposite walls of two adjacent second stator teeth 300 .

[0083] Correspondingly, the stator core 10 further includes a first slot wedge 400 , and the first slot wedge 400 is embedded in the first groove 10 c.

[0084] The first slot wedge 400 embedded in the first groove 10 c can tighten the second stator tooth 300 along the circumference of the core body 100 , fasten the second stator tooth 300 , and eliminate the small gap at the connection between the second stator tooth 300 and the first stator tooth 200 .

[0085] In some embodiments, the side walls of the first tooth slots 10 a are provided with second grooves 10 d in pairs, that is, the opposite walls of two adjacent first stator teeth 200 are each provided with a second groove 10 d.

[0086] Correspondingly, the stator core 10 further includes a second slot wedge 500 , and the second slot wedge 500 is embedded in the second groove 10 d .

[0087] The second slot wedge 500 embedded in the second groove 10 d abuts against the winding 20 embedded in the first tooth slot 10 a to prevent the winding 20 from loosening.

[0088] In summary, the above-mentioned stator core 10 utilizes the detachably connected first stator tooth 200 and the second stator tooth 300 to form a complete stator tooth. The second stator tooth 300 can be separated from the first stator tooth 200 before embedding the winding 20, which is convenient for embedding the winding 20 as in the open slot scheme. The second stator tooth 300 can also be connected to the first stator tooth 200 after embedding the winding 20, effectively reducing the air gap tooth harmonic magnetic field and reducing the effective air gap length of the motor, thereby improving the motor efficiency and power factor, and achieving the same effect as the semi-open slot / semi-closed slot / closed slot scheme.

[0089] This embodiment also provides a motor, specifically a high voltage motor, which includes windings 20 and the above-mentioned stator core 10. The number of windings 20 is the same as and corresponds to the number of first tooth slots 10a, and each winding 20 is respectively embedded in the corresponding first tooth slot 10a.

[0090] Example 2

[0091] Please also read Figure 5 and Figure 6 , which is different from Embodiment 1, in this embodiment, the first stator tooth 200 includes a first tooth portion 210 and a second tooth portion 220. The first tooth portion 210 and the second tooth portion 220 are arranged along the radial direction of the core body 100, and the first tooth portion 210 is located between the second tooth portion 220 and the core body 100, and the core body 100, the first tooth portion 210 and the second tooth portion 220 are integrally formed. At this time, the first tooth slot 10a is located between the first tooth portions 210 of two adjacent first stator teeth 200.

[0092] Correspondingly, the second stator tooth 300 is located at one side of the second tooth portion 220 of the corresponding first stator tooth 200 along the circumferential direction of the core body 100, and the second stator tooth 300 is detachably connected to the second tooth portion 220 of the corresponding first stator tooth 200. At this time, the second tooth slot 10b is located between the second stator tooth 300 and the second tooth portion 220 of the adjacent first stator tooth 200.

[0093] Optionally, the width of the first tooth portion 210 gradually decreases in the direction away from the core body 100, while the width of the first tooth slot 10a between two adjacent first tooth portions 210 remains unchanged, and the width of the first tooth slot 10a is equal to the sum of the width of the winding 20 and the wire gap.

[0094] Meanwhile, the width of the second tooth portion 220 gradually decreases in the direction away from the core body 100. When the second stator tooth 300 is separated from the second tooth portion 220, there is a sufficiently wide spacing between two adjacent second tooth portions 220, so that the winding 20 can smoothly pass through and be embedded in the first tooth slot 10a.

[0095] Accordingly, along the direction away from the core body 100 , the width of the second stator tooth 300 gradually increases, and the width of the second tooth slot 10 b between the second stator tooth 300 and the second tooth portion 220 of the adjacent first stator tooth 200 gradually decreases.

[0096] Please combine Figure 7 and Figure 8 In some embodiments, a clamping portion 201 is provided on one side of the second stator tooth 300 facing the second tooth portion 220 of the corresponding first stator tooth 200, and a clamping groove 301 is provided on one side of the second tooth portion 220 facing the second stator tooth 300, and the clamping portion 201 is clamped into the clamping groove 301 along the axial direction of the core body 100. Alternatively, the second stator tooth 300 may be placed between two adjacent second tooth portions 220, and then the clamping portion 201 may be clamped into the clamping groove 301 along the circumferential direction of the core body 100.

[0097] Example 3

[0098] Please also read Fig. 9 and Fig.10 , which is different from Embodiment 1, in this embodiment, the stator core 10 further includes third stator teeth 600. The third stator teeth 600 are arranged along the radial direction of the core body 100, and the third stator teeth 600 are fixedly arranged on the inner side wall of the core body 100. The number of the third stator teeth 600 is the same as that of the first stator teeth 200, and each third stator tooth 600 and each first stator tooth 200 are alternately arranged along the circumferential direction of the core body 100.

[0099] At this time, the third stator tooth 600 divides the space between two adjacent first stator teeth 200 into two first tooth slots 10a, and the first tooth slot 10a is located between the third stator tooth 600 and the first stator tooth 200. Similarly, the third stator tooth 600 divides the space between two adjacent second stator teeth 300 into two second tooth slots 10b, and the second tooth slot 10b is located between the third stator tooth 600 and the second stator tooth 300.

[0100] When the second stator tooth 300 is separated from the first stator tooth 200 , there is a sufficiently wide interval between two adjacent third stator teeth 600 , so that the winding 20 can smoothly pass through and be embedded in the first tooth slot 10 a .

[0101] Optionally, the third stator tooth 600 is formed integrally with the core body 100 .

[0102] Example 4

[0103] See also Fig.11 , which is different from Embodiments 1 to 3 in that, in this embodiment, the stator core 10 further includes a magnetic bridge 700. The magnetic bridge 700 is located between two adjacent second stator teeth 300 and connects the two second stator teeth 300 at the same time.

[0104] Please also read Figures 11 to 13 In some embodiments, each second stator tooth 300 is connected by a magnetic bridge 700 to form a complete ring. Each second stator tooth 300 can be installed at the same time, which reduces the installation time.

[0105] In addition, since the second stator teeth 300 are connected as one, it is possible to prevent the second stator teeth 300 from falling off inward along the radial direction of the core body 100 when subjected to the radial electromagnetic force of the rotor.

[0106] Please also read Fig.14 and Fig.15 In other embodiments, the plurality of second stator teeth 300 are divided into at least two groups, and the second stator teeth 300 in the same group are sequentially connected through the magnetic bridge 700 .

[0107] At this time, the overall size of the integrated second stator teeth 300 is relatively small, and can be made of silicon steel material with a smaller width.

[0108] Optionally, the plurality of second stator teeth 300 are divided into n groups, where n is a common factor of the number of tooth slots Z. The number of second stator teeth 300 in each group is Z / n, and the second stator teeth 300 in the same group are combined to form a 1 / n circle component.

[0109] In this embodiment, the magnetic bridge 700 is arc-shaped, and the side surface of the magnetic bridge 700 facing away from the core body 100 and the end surface of the second stator tooth 300 away from the core body 100 are located on the same circumferential surface.

[0110] In addition, when processing the magnetic bridge 700, attention needs to be paid to the magnetic flux leakage ratio, and the thickness of the magnetic bridge 700 is determined through electromagnetic design.

[0111] Example 5

[0112] Please also read Fig.16 and Fig.17, which is different from Embodiments 1 to 4, is that, in this embodiment, a fastening layer 800 is wound around the connection between the second stator tooth 300 and the corresponding first stator tooth 200 to fasten the connection between the second stator tooth 300 and the first stator tooth 200 and eliminate the tiny gap between the second stator tooth 300 and the first stator tooth 200.

[0113] For example, a glass ribbon is wrapped around the connection between the second stator tooth 300 and the first stator tooth 200 . The wrapped glass ribbon is converted into glass fiber reinforced plastic after subsequent stator varnishing to form a fastening layer 800 having high mechanical strength.

[0114] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limiting, and thus other examples of the exemplary embodiments may have different values.

[0115] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0116] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A stator core, characterized in that: The stator core has a first tooth slot and a second tooth slot, and the stator core includes: An iron core body, wherein the iron core body is arranged in a ring shape; A first stator tooth is arranged along the radial direction of the core body, a plurality of the first stator teeth are arranged, and the plurality of the first stator teeth are fixedly arranged on the inner side wall of the core body; and Second stator teeth are arranged along the radial direction of the core body, the number of the second stator teeth is the same as and corresponds to the number of the first stator teeth, and the second stator teeth are detachably connected to the corresponding first stator teeth; Among them, the first tooth slot is located between two adjacent first stator teeth, the first tooth slot is used to accommodate the winding, the second tooth slot is located between two adjacent second stator teeth, or between the first stator tooth and the second stator tooth, the second tooth slot is connected to the first tooth slot, and the width of the second tooth slot at one end away from the first tooth slot is smaller than the width of the second tooth slot at one end close to the first tooth slot.

2. The stator core according to claim 1, characterized in that: One end of the second stator tooth close to the core body is detachably connected to one end of the corresponding first stator tooth away from the core body, and the second tooth slot is located between two adjacent second stator teeth.

3. The stator core according to claim 1, characterized in that: The first stator tooth comprises a first tooth portion and a second tooth portion, the first tooth portion and the second tooth portion are arranged along the radial direction of the core body, the first tooth portion is located between the second tooth portion and the core body, and the first tooth slot is located between the first tooth portions of two adjacent first stator teeth; The second stator tooth is located at one side of the second tooth portion of the corresponding first stator tooth along the circumferential direction of the core body, and the second tooth slot is located between the second stator tooth and the second tooth portion of the adjacent first stator tooth.

4. The stator core according to claim 1, characterized in that: The stator core further includes a third stator tooth, which is arranged along the radial direction of the core body, and is fixedly arranged on the inner side wall of the core body, and the third stator tooth and the first stator tooth are alternately arranged along the circumferential direction of the core body; The first tooth slot is located between the third stator tooth and the first stator tooth, and the second tooth slot is located between the third stator tooth and the second stator tooth.

5. The stator core according to any one of claims 1 to 4, characterized in that: The stator core further includes a magnetic bridge, which is located between two adjacent second stator teeth and connects the two second stator teeth at the same time.

6. The stator core according to claim 5, characterized in that: The plurality of second stator teeth are divided into at least two groups, and the second stator teeth in the same group are sequentially connected through the magnetic bridge.

7. The stator core according to any one of claims 1 to 4, characterized in that: A fastening layer is wound around the connection between the second stator tooth and the corresponding first stator tooth.

8. The stator core according to any one of claims 1 to 4, characterized in that: The side walls of the second tooth grooves are provided with first grooves in pairs; The stator core further includes a first slot wedge, and the first slot wedge is embedded in the first groove.

9. The stator core according to any one of claims 1 to 4, characterized in that: One of the first stator tooth and the second stator tooth is provided with a clamping portion, and the other of the first stator tooth and the second stator tooth is provided with a clamping groove, and the clamping portion is engaged with the clamping groove.

10. A motor, characterized in that: The invention comprises a stator core according to any one of claims 1 to 9 and a winding, wherein the winding is embedded in the first tooth slot.

Images