Stator Core, Stator and Electric Machine

Abstract

The present invention provides a stator core, a stator and an electric motor. The stator core includes an inner core and an outer core. The inner core includes tooth portions and yoke portions. The tooth portions have inner bonding surfaces, and the inner bonding surfaces include first non-insulated surfaces. The outer core is connected to the tooth portions. The outer core has a second non-insulated surface and a blocking surface. The blocking surface is insulated. The second non-insulated surface is in contact with the first non-insulated surface. The minimum distance between the edge of the blocking surface on the side close to the blocking groove and the end surface of the tooth portion along the circumferential direction of the yoke portion is L, or the minimum distance between the edge of the inner bonding surface along the circumferential direction of the yoke portion and the blocking surface is L. The minimum wire diameter of the winding is D1, and L < D1. The stator includes the above-mentioned stator core. The electric motor includes the above-mentioned stator. The stator core, stator and electric motor provided by the present invention can prevent the enameled wire from touching the exposed part of the non-insulated bonding surface of the tooth portion, thereby preventing the insulation failure between the enameled wire and the stator core.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and particularly to a stator core, a stator, and a motor. Background Art

[0002] At present, in order to improve the utilization rate of raw materials, some stator cores adopt a design of separating teeth and boots; during the production process of the stator core, the originally separated tooth parts and boot parts will be assembled into a whole. In the case of adopting the design of separating teeth and boots, the joint surface between the tooth part and the boot part needs to be non-insulated so as to achieve magnetic conduction between the tooth part and the boot part.

[0003] In order to ensure that the joint surface of the boot part can conduct magnetic flux completely, for some stator cores, the joint surface of the tooth part needs to be larger than the joint surface of the boot part so that the joint surface of the tooth part completely covers the joint surface of the boot part. In this case, a part of the non-insulated joint surface of the tooth part is exposed. During the use of the motor, the enameled wire of the winding may touch the exposed part of this non-insulated joint surface. This does not meet the insulation requirements of the motor and is likely to cause insulation failure between the stator core and the enameled wire because the enameled wire may be damaged, and the damaged enameled wire may contact the non-insulated joint surface and cause a short circuit. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a stator core that can prevent the enameled wire from touching the exposed part of the non-insulated joint surface of the tooth part, thereby preventing insulation failure between the enameled wire and the stator core.

[0005] The present invention also provides a stator having the above stator core.

[0006] The present invention also provides a motor having the above stator.

[0007] The stator core according to the first aspect embodiment of the present invention includes: an inner core including a yoke part and tooth parts, the yoke part is annular, the tooth parts are used for installing windings, the tooth parts are connected to the yoke part and protrude radially along the yoke part, one end of the tooth part away from the yoke part has an inner joint surface, and the inner joint surface includes a first non-insulated surface; an outer core connected to one end of the tooth part away from the yoke part, and the side of the outer core facing the yoke part has a second non-insulated surface and an insulating blocking surface that are separated from each other, the first non-insulated surface fits with the second non-insulated surface and covers the second non-insulated surface; the outer core has a blocking groove, along the circumferential direction of the yoke part, the blocking surface and the second non-insulated surface are separated by the blocking groove; a side wall surface of the blocking groove close to the blocking surface is a blocking wall, and the minimum distance between the end surface of the tooth part along the circumferential direction of the yoke part and the blocking wall is L, and the minimum wire diameter of the winding is D1, satisfying: L < D1.

[0008] The stator core according to the first aspect embodiment of the present invention has at least the following beneficial effects: The stator core provided by the present invention blocks the enameled wire through a certain part of the tooth portion or the outer iron core to limit the enameled wire, prevent the enameled wire from moving to a position where it may contact the first non-insulating surface, and leave a certain gap between the enameled wire and the first non-insulating surface, thereby preventing insulation failure caused by the contact between the enameled wire and the first non-insulating surface.

[0009] According to some embodiments of the present invention, along the circumferential direction of the yoke portion, the blocking surface deviates from the tooth portion with respect to the second non-insulating surface, and the tooth portion shields a part of the blocking groove; the blocking wall is insulated.

[0010] According to some embodiments of the present invention, one end of the tooth portion away from the yoke portion has a mounting body, the mounting body protrudes radially along the yoke portion with respect to the inner joint surface, the outer iron core has a mounting groove, and the mounting body is arranged in the mounting groove.

[0011] According to some embodiments of the present invention, the groove wall of the mounting groove contacts the outer surface of the mounting body and realizes magnetic conduction.

[0012] According to some embodiments of the present invention, along the circumferential direction of the yoke portion, the first non-insulating surface is longer than the second non-insulating surface.

[0013] According to some embodiments of the present invention, the inner joint surface further includes an insulating surface, and along the circumferential direction of the yoke portion, the insulating surface is connected to the outer edge of the first non-insulating surface.

[0014] According to some embodiments of the present invention, the number of the outer iron cores is less than the number of the tooth portions, and each outer iron core is connected to a plurality of tooth portions.

[0015] According to some embodiments of the present invention, the tooth portion has two first avoidance groove groups, the two first avoidance groove groups are respectively located on both sides of the mounting body, the first avoidance groove group includes two first avoidance grooves, and along the axial direction of the yoke portion, the two first avoidance grooves in the same first avoidance groove group are arranged at both ends of a first non-insulating surface, and the groove walls of the first avoidance grooves are insulated.

[0016] According to some embodiments of the present invention, the outer iron core has two second avoidance groove groups, the two second avoidance groove groups are respectively located on both sides of the mounting groove, the second avoidance groove group includes two second avoidance grooves, and along the axial direction of the yoke portion, the two second avoidance grooves in the same second avoidance groove group are arranged at both ends of a second non-insulating surface, and the groove walls of the second avoidance grooves are insulated.

[0017] According to some embodiments of the present invention, the stator core includes: an inner core including a yoke portion and tooth portions. The yoke portion is annular. The tooth portions are for mounting windings. The tooth portions are connected to the yoke portion and protrude radially from the yoke portion. One end of the tooth portion away from the yoke portion has an inner joint surface, and the inner joint surface includes a first non-insulating surface; an outer core is connected to one end of the tooth portion away from the yoke portion. One side of the outer core facing the yoke portion has a second non-insulating surface and an insulating blocking surface that are separated from each other. The first non-insulating surface is attached to and covers the second non-insulating surface. In the radial direction of the yoke portion, the blocking surface is spaced from the first non-insulating surface. The minimum distance between the edge of the inner joint surface in the circumferential direction of the yoke portion and the blocking surface is L, and the minimum wire diameter of the winding is D1, satisfying: L < D1.

[0018] According to some embodiments of the present invention, one end of the tooth portion away from the yoke portion has a mounting body, the mounting body protrudes radially from the inner joint surface with respect to the yoke portion, and the outer core has a mounting groove, and the mounting body is disposed in the mounting groove.

[0019] According to some embodiments of the present invention, the groove wall of the mounting groove contacts the outer surface of the mounting body to achieve magnetic conduction.

[0020] According to some embodiments of the present invention, in the circumferential direction of the yoke portion, the first non-insulating surface is longer than the second non-insulating surface.

[0021] According to some embodiments of the present invention, the inner joint surface further includes an insulating surface, and in the circumferential direction of the yoke portion, the insulating surface is connected to the outer edge of the first non-insulating surface.

[0022] According to some embodiments of the present invention, the number of the outer cores is less than the number of the tooth portions, and each outer core is connected to a plurality of tooth portions.

[0023] According to some embodiments of the present invention, the tooth portion has two first avoidance groove groups, and the two first avoidance groove groups are respectively located on both sides of the mounting body. The first avoidance groove group includes two first avoidance grooves. In the axial direction of the yoke portion, the two first avoidance grooves in the same first avoidance groove group are arranged at both ends of a first non-insulating surface, and the groove walls of the first avoidance grooves are insulated.

[0024] According to some embodiments of the present invention, the outer core has two second avoidance groove groups, and the two second avoidance groove groups are respectively located on both sides of the mounting groove. The second avoidance groove group includes two second avoidance grooves. In the axial direction of the yoke portion, the two second avoidance grooves in the same second avoidance groove group are arranged at both ends of a second non-insulating surface, and the groove walls of the second avoidance grooves are insulated.

[0025] The stator according to the embodiment of the second aspect of the present invention includes the stator core of the embodiment of the first aspect.

[0026] The stator according to the embodiment of the second aspect of the present invention has at least the following beneficial effects: The enameled wire is not likely to come into contact with the non-insulated joint surface (i.e., the first non-insulated surface) of the tooth portion, the insulation between the stator core and the winding is not likely to fail, and the safety of the stator is relatively good.

[0027] The motor according to the embodiment of the third aspect of the present invention includes the stator of the embodiment of the second aspect.

[0028] The stator according to the embodiment of the second aspect of the present invention has at least the following beneficial effects: The enameled wire is not likely to come into contact with the non-insulated joint surface (i.e., the first non-insulated surface) of the tooth portion, the insulation between the stator core and the winding is not likely to fail, and the safety of the motor is relatively good.

[0029] The additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a perspective schematic view of a stator core in an embodiment of the present invention;

[0031] Figure 2 is Figure 1 the top view of the stator core in;

[0032] Figure 3 is Figure 1 the perspective schematic view of the inner core of the stator core in;

[0033] Figure 4 is Figure 1 the perspective schematic view of the outer core of the stator core in;

[0034] Figure 5 is Figure 1 the enlarged schematic view of area A in;

[0035] Figure 6 is Figure 2 the enlarged schematic view of area B in;

[0036] Figure 7 is Figure 6 the schematic view when the outer core and the inner core are separated from each other in the structure shown;

[0037] Figure 8 is Figure 3 the enlarged schematic view of area C in;

[0038] Figure 9 is Figure 4 the enlarged schematic view of area E in;

[0039] Figure 10 It is a schematic diagram of the distribution position of the first avoidance groove;

[0040] Figure 11 It is a schematic diagram of the distribution position of the second avoidance groove;

[0041] Figure 12 It is a schematic diagram of the stator core according to another embodiment of the present invention;

[0042] Figure 13 It is a schematic diagram of the stator of the present invention;

[0043] Figure 14 is Figure 13 an enlarged schematic diagram of the F area in;

[0044] Figure 15 It is a plan view of a type-I punching sheet;

[0045] Figure 16 It is a plan view of a type-II punching sheet;

[0046] Figure 17 It is a schematic diagram when each outer core in the stator core is connected to a plurality of tooth portions.

[0047] Reference numerals in the drawings:

[0048] 101 - Stator core, 102 - Inner core, 103 - Yoke portion, 104 - Tooth portion, 105 - Outer core, 106 - Protruding body, 107 - Mounting body, 108 - Base body, 109 - Bonding body, 110 - Abutting portion;

[0049] 201 - Blocking surface, 202 - Second non-insulating surface, 203 - Insulating surface, 204 - First non-insulating surface, 205 - Inner bonding surface, 206 - First positioning surface, 207 - Second positioning surface;

[0050] 301 - Blocking groove, 302 - Mounting groove, 303 - First avoidance groove, 304 - Second avoidance groove, 305 - Blocking wall;

[0051] 401 - Winding, 402 - Enameled wire, 403 - Type-I punching sheet, 404 - Type-II punching sheet, 405 - Stator. Detailed description of the specific implementation mode

[0052] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as limiting the present invention.

[0053] In the description of the present invention, it should be understood that with regard to the orientation description, such as the orientation or positional relationship indicated by up, down, etc., it is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0054] In the description of the present invention, "a plurality of" refers to more than two. If there is a description of first and second, it is only for the purpose of distinguishing technical features, and should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence relationship of the indicated technical features.

[0055] In the description of the present invention, unless otherwise clearly defined, terms such as "arrangement", "installation", "connection", etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0056] The present invention provides a stator core 101.

[0057] Refer to Figures 1 to 4 , the stator core 101 includes an outer core 105 and an inner core 102 which are connected to each other. The inner core 102 includes a yoke portion 103 and tooth portions 104. The outer core 105 is equivalent to a boot portion. The yoke portion 103 is annular. There are a plurality of tooth portions 104. The tooth portions 104 are connected to the yoke portion 103, and the tooth portions 104 protrude radially along the yoke portion 103. The tooth portions 104 are used for installing windings 401.

[0058] It should be noted that in the present invention, "the tooth portions 104 protrude radially along the yoke portion 103" specifically may mean that the tooth portions 104 protrude relative to the yoke portion 103 in a direction away from the axis of the yoke portion 103 (as Figure 1 shown); it may also mean that the tooth portions 104 protrude relative to the yoke portion 103 in a direction close to the axis of the yoke portion 103 (equivalent to Figure 1 in which the outer core 105 and the tooth portions 104 are adjusted from the outside of the yoke portion 103 to the inside of the yoke portion 103). Figure 1 The shown stator core 101 is applicable to an outer rotor motor. There are a plurality of tooth portions 104. The plurality of tooth portions 104 are circumferentially spaced apart along the yoke portion 103. There are also a plurality of outer cores 105. Each tooth portion 104 is connected to an outer core 105.

[0059] Refer to Figure 3 and Figure 8 , the tooth portion 104 has an inner joint surface 205, and one end of the inner joint surface 205 away from the yoke portion 103 has a first non-insulated surface 204, as Figure 8As shown, the length of the first non-insulating surface 204 along the circumferential direction of the yoke portion 103 is D5. Refer to Figure 4 , the outer surface of the outer iron core 105 has a second non-insulating surface 202 and a blocking surface 201. Both the second non-insulating surface 202 and the blocking surface 201 are located on the side of the outer iron core 105 facing the tooth portion 104. As Figure 4 shown, the length of the second non-insulating surface 202 along the circumferential direction of the yoke portion 103 is D3. The first non-insulating surface 204 and the second non-insulating surface 202 are not coated with insulating materials, the blocking surface 201 is coated with an insulating material, and the blocking surface 201 is separated from the second non-insulating surface 202 (meaning the two are not directly connected). Refer to Figure 4 , along the circumferential direction of the yoke portion 103, the length of the blocking surface 201 is D2.

[0060] Combined with Figure 4 , Figure 6 and Figure 8 , the first non-insulating surface 204 and the second non-insulating surface 202 are in contact, so as to achieve magnetic conduction between the outer iron core 105 and the inner iron core 102. Along the circumferential direction of the yoke portion 103, the length of the first non-insulating surface 204 is greater than the length of the second non-insulating surface 202, that is, D5 > D3. Along the axial direction of the yoke portion 103, the length of the first non-insulating surface 204 can be equal to the length of the second non-insulating surface 202. The second non-insulating surface 202 is completely covered by the first non-insulating surface 204 to ensure that the second non-insulating surface 202 can conduct magnetism completely. From Figure 6 or Figure 12 , along the circumferential direction of the yoke portion 103, the blocking surface 201 deviates from the tooth portion 104 relative to the second non-insulating surface 202. That is, along the circumferential direction of the yoke portion 103, the second non-insulating surface 202 is closer to the tooth portion 104 than the blocking surface 201. It should be noted that Figure 8 in, for the convenience of distinguishing the first non-insulating surface 204, the first non-insulating surface 204 is filled with hatching. The hatching here does not actually indicate that this part is a section.

[0061] During the production process of the stator core 101, the originally separated tooth portion 104 and the outer iron core 105 will be assembled into a whole. In the case of adopting the tooth-boot separation design, the joint surface between the tooth portion 104 and the outer iron core 105 needs to be non-insulating in order to achieve magnetic conduction between the tooth portion 104 and the outer iron core 105. That is, the first non-insulating surface 204 is non-insulating, and the second non-insulating surface 202 is non-insulating, so as to achieve magnetic conduction between the tooth portion 104 and the outer iron core 105. Because the magnetic permeability of the insulating material is low and the magnetic permeability of air is also very low, in order to ensure the magnetic conduction effect, both the first non-insulating surface 204 and the second non-insulating surface 202 need to be non-insulating and the two need to be in contact.

[0062] The outer iron core 105 has a limiting effect on the winding 401 wound around the tooth portion 104. Although the stator iron core 101 or the stator does not need to rotate in the motor, the vibration during the operation of the motor will cause the winding 401 to displace. The outer iron core 105 can prevent the winding 401 from moving radially along the yoke portion 103 (moving radially along the yoke portion 103 and away from the yoke portion 103), thereby limiting the winding 401 and preventing the winding 401 from detaching from the tooth portion 104.

[0063] In order to ensure that the non-insulated joint surface of the outer iron core 105 (i.e., the second non-insulated surface 202) can be fully magnetically conductive to reduce the magnetic load at the non-insulated joint surface of the outer iron core 105, the joint surface of the tooth portion 104 needs to be larger than the joint surface of the outer iron core 105 so that the joint surface of the tooth portion 104 can completely cover the joint surface of the outer iron core 105. In this case, a part of the non-insulated joint surface of the tooth portion 104 is exposed. During the use of the motor, the enameled wire 402 of the winding 401 may touch the exposed part of this non-insulated joint surface. That is, along the circumferential direction of the yoke portion 103, the length of the first non-insulated surface 204 needs to be greater than the length of the second non-insulated surface 202. Along the circumferential direction of the yoke portion 103, a part of the first non-insulated surface 204 is exposed. Contact between the enameled wire 402 and this exposed part of the first non-insulated surface 204 should be avoided to meet the insulation requirements.

[0064] In the present invention, the gap between the blocking surface 201 and the tooth portion 104 cannot allow the enameled wire 402 to pass through, or rather, the blocking surface 201 and the tooth portion 104 can hold the enameled wire 402, thereby preventing the enameled wire 402 from contacting the part of the first non-insulated surface 204 that is not covered by the second non-insulated surface 202. Specifically, this can be achieved by reasonably setting the distance between the blocking surface 201 and the tooth portion 104.

[0065] Refer to Figure 13 and Figure 14 , the winding 401 is wound by the enameled wire 402, and the winding 401 is sleeved outside the tooth portion 104; the minimum wire diameter of the winding 401 is denoted as D1. If the enameled wire 402 is set as a round wire, the diameter of the enameled wire 402 is the minimum wire diameter of the winding 401; if the enameled wire 402 is set as a flat wire (at this time, the cross-section of the enameled wire 402 is a rectangle), the minimum wire diameter of the winding 401 is the length of the narrow side of its cross-section (as Figure 14 shown).

[0066] Refer to Figure 6, in some embodiments, one side of the outer iron core 105 facing the yoke portion 103 has a blocking groove 301. Along the circumferential direction of the yoke portion 103, the second non-insulating surface 202 and the blocking surface 201 are separated by the blocking groove 301, and a part of the blocking groove 301 is blocked by the tooth portion 104. One side wall surface of the blocking groove 301 close to the blocking surface is the blocking wall 305. The minimum distance between the blocking wall 305 and the side surface of the adjacent tooth portion can be denoted as L. Here, the side surface of the tooth portion 104 refers to the end surface of the tooth portion 104 along the circumferential direction of the yoke portion 103. If it is set as Figure 6 as such, the minimum distance between the edge of the blocking surface 201 close to the blocking groove 301 and the side surface of the adjacent tooth portion 104 can also be regarded as L. If it is necessary to prevent the enameled wire 402 from contacting the uncovered part of the first non-insulating surface 204, then it is necessary to satisfy L < D1. It should be noted that in the present invention, the "surface" at a certain part only refers to the limited physical surface on the component, not the infinite virtual surface where the surface is located.

[0067] Referring to Figure 6 , during the operation of the motor, if the enameled wire 402 is to contact the first non-insulating surface 204, then the enameled wire 402 wound on the tooth portion 104 needs to have two movement paths successively. The enameled wire needs to first move radially away from the yoke portion 103 along the yoke portion 103 and move to a position where it can cross the first non-insulating surface 204 (here it means that the enameled wire 402 moves radially along the yoke portion 103 and crosses the first non-insulating surface 204), and then move a certain distance along the circumferential direction of the yoke portion 103. However, due to L < D1, the enameled wire 402 cannot pass through the gap between the blocking surface 201 and the tooth portion 104, and it is difficult for the enameled wire 402 to contact the first non-insulating surface 204.

[0068] Or, referring to Figure 12 , in some other embodiments, the second non-insulating surface 202 and the blocking surface 201 are arranged at intervals along the radial direction of the yoke portion 103, so as to achieve the separation between the two; and along the radial direction of the yoke portion 103, a part of the blocking surface 201 is blocked by the tooth portion 104. In this case, the minimum distance between the edge of the inner joint surface 205 along the circumferential direction of the yoke and the blocking surface 201 can be denoted as L. Similarly, to prevent the enameled wire 402 from contacting the uncovered part of the first non-insulating surface 204, it is necessary to satisfy L < D1. Since L < D1, when the enameled wire 402 moves along the circumferential direction of the yoke portion 103, it cannot pass through the gap between the blocking surface 201 and the tooth portion 104, and it is difficult for the enameled wire 402 to contact the second non-insulating surface 202.

[0069] The stator core 101 provided by the present invention limits the enameled wire 402 by blocking the enameled wire 402 at a certain part of the tooth part 104 or the outer core 105, preventing the enameled wire 402 from moving to a position where it may contact the first non-insulating surface 204, and leaving a certain gap between the enameled wire 402 and the first non-insulating surface 204, thereby preventing insulation failure caused by the contact between the enameled wire 402 and the first non-insulating surface 204.

[0070] The inner core 102 can be formed by stacking a plurality of punching sheets, and the punching sheets can be formed by stamping silicon steel sheets. The outer core 105 can be formed by stacking punching sheets to reduce the processing difficulty and cost of the outer core 105 (the shape of the punching sheet used to form the outer core 105 is different from the shape of the punching sheet used to form the inner core 102); the outer core 105 can also be processed by CNC machining (i.e., computer numerical control machining), casting, etc. Relatively speaking, Figure 12 In the outer core 105 of, the blocking surface 201 and the second non-insulating surface 202 are radially offset from each other along the yoke part 103, separating the blocking surface 201 and the second non-insulating surface 202. The outer core 105 does not need to be provided with a barrier groove 301, and the shape is relatively simple and convenient for processing. Combining with the movement path of the enameled wire 402 when it is about to contact the first non-insulating surface 204 mentioned above, Figure 6 In the outer core 105 of, it can block the enameled wire 402 radially along the yoke part 103. This setting is equivalent to blocking the first section of movement of the enameled wire 402, and the effect of preventing insulation failure is better. In addition, Figure 6 In the outer core 105 of, there are fewer protruding parts on the contour, which is beneficial to reducing the wasted material when manufacturing the punching sheet (in the case where the outer core 105 is formed by stacking punching sheets).

[0071] Figure 6 and Figure 12 In the two embodiments of, the shape structures of the outer core 105 are different, but the shape structures of the inner core 102 in the two embodiments can be the same. The structure of the inner core 102 mentioned in the present invention can be used for Figure 6 the stator core 101 shown in, and can also be used for Figure 12 the stator core 101 shown in.

[0072] Referring to Figure 7 and Figure 8 The tooth part 104 includes a protruding body 106 and a mounting body 107. One end of the protruding body 106 is connected to the yoke part 103, the other end of the protruding body 106 protrudes radially along the yoke part 103, and the end surface of the protruding body 106 away from the yoke part 103 is the inner bonding surface 205. The mounting body 107 is connected to the inner bonding surface 205 and protrudes relative to the inner bonding surface 205 (protrudes radially along the yoke part 103). Referring to Figure 4, on the side of the outer iron core 105 facing the tooth part 104, an installation groove 302 is further provided, and the installation body 107 can be accommodated in the installation groove 302, so as to realize the assembly between the inner iron core 102 and the outer iron core 105. When assembling the stator iron core 101, the installation body 107 can move axially along the yoke part 103 relative to the tooth part 104, so that the installation body 107 is inserted into the installation groove 302; for example, the installation body 107 is inserted into the installation groove 302 from top to bottom.

[0073] In order to ensure the connection firmness between the inner iron core 102 and the outer iron core 105, the installation body 107 and the installation groove 302 can be set to be in interference fit; or the installation body 107 and the wall surface of the installation groove 302 can be bonded by glue. In addition, referring to Figure 4 , Figure 7 and Figure 8 , the installation groove 302 can also be set in the form of a dovetail groove, and correspondingly, a part of the installation body 107 is set to be trapezoidal; in this setting method, the side wall of the installation groove 302 can abut against the installation body 107 and prevent the inner iron core 102 and the outer iron core 105 from separating from each other radially along the yoke part 103.

[0074] Specifically, referring to Figure 7 , the installation body 107 has a first positioning surface 206, and the groove wall of the installation groove 302 has a second positioning surface 207, and both the first positioning surface 206 and the second positioning surface 207 are inclined. There are two first positioning surfaces 206 and two second positioning surfaces 207, and the two first positioning surfaces 206 are arranged at intervals along the circumferential direction of the yoke part 103, and the two second positioning surfaces 207 are arranged at intervals along the circumferential direction of the yoke part 103. Along the protruding direction of the installation body 107 (if taking the Figure 7 specific direction as an example, the installation body 107 protrudes from back to front), the distance between the two first positioning surfaces 206 gradually increases, and the distance between the two second positioning surfaces 207 also gradually increases. If there is a tendency for the tooth part 104 and the outer iron core 105 to separate from each other radially along the yoke part 103, then each first positioning surface 206 will respectively abut against a second positioning surface 207, thereby preventing the separation between the tooth part 104 and the outer iron core 105.

[0075] It should be noted that when the installation groove 302 is set as a dovetail groove, it is also possible to consider making the installation body 107 and the installation groove 302 in interference fit, or bonding the installation body 107 and the wall surface of the installation groove 302 with glue.

[0076] In some embodiments, the wall surface of the mounting groove 302 is not coated with an insulating material, and the portion of the outer surface of the mounting body 107 that contacts the wall surface of the mounting groove 302 is also not coated with an insulating material. The wall surface of the mounting groove 302 contacts the outer surface of the mounting body 107 to achieve magnetic conduction. Such a setting can increase the magnetic conduction area between the tooth portion 104 and the outer iron core 105, and can ensure the positioning accuracy between the outer iron core 105 and the inner iron core 102.

[0077] In the coating process, a common defect is the uneven thickness of the insulating material layer. The uneven thickness of the insulating material layer may cause the dimensions of the mounting body 107 or the mounting groove 302 to be mismatched. Therefore, if the above two parts are not coated with an insulating material, the situation of dimensional mismatch caused by the coating process can be avoided, and the positioning accuracy between the outer iron core 105 and the inner iron core 102 can be improved.

[0078] In addition, when the winding 401 wound around the tooth portion 104 is energized, the magnetic induction lines of the generated magnetic field mainly extend radially along the yoke portion 103. The wall surface of the mounting groove 302 is not coated with an insulating material, and the portion of the outer surface of the mounting body 107 that contacts the wall surface of the mounting groove 302 is also not coated with an insulating material. This can increase the total width of the non-insulating contact surface between the tooth portion 104 and the outer iron core 105 (the width here refers to the length along the circumferential direction of the yoke portion 103), thereby improving the magnetic conduction effect. By increasing the total width of the non-insulating contact surface between the tooth portion 104 and the outer iron core 105, the magnetic load of the non-insulating contact surface can also be reduced, the possibility of magnetic circuit saturation can be reduced, and thus the motor efficiency can be ensured and the motor noise can be reduced.

[0079] Figure 2 In [description], the number of the outer iron cores 105 is equal to the number of the tooth portions 104, and each outer iron core 105 is respectively connected to one tooth portion 104. With reference to Figure 17 , in some embodiments, the number of the outer iron cores 105 is less than the number of the tooth portions 104, and each outer iron core 105 is respectively connected to multiple tooth portions 104. This can reduce the installation process of the outer iron cores 105 and improve the assembly efficiency of the stator 405. Taking Figure 17 as an example, there are 6 outer iron cores 105 in total and 18 tooth portions 104 in total. Each outer iron core 105 is connected to 3 tooth portions 104 (more specifically, each outer iron core 105 has 3 mounting grooves 302). In this setting method, when the assembly between one outer iron core 105 and one tooth portion 104 is completed, this one outer iron core 105 will be simultaneously assembled with the other two tooth portions 104. This can reduce the repeated outer iron core 105 assembly steps required, thereby improving the assembly efficiency of the stator 405. It should be noted that although Figure 17 does not specifically show the structure for preventing the enameled wire 402 from contacting the first non-insulating surface 204, as mentioned above in Figure 6 andFigure 12 The insulation setting (L<D1) in it, as well as the first avoidance groove group and the second avoidance groove group to be described below, can all be combined with the setting that "each outer iron core 105 is respectively connected to a plurality of tooth parts 104".

[0080] In some embodiments, when the second non-insulating surface 202 is completely covered by the first non-insulating surface 204, the height of the first non-insulating surface 204 can be greater than the height of the second non-insulating surface 202. The height of the first non-insulating surface 204 refers to the length of the first non-insulating surface 204 along the axial direction of the yoke 103 (for example Figure 8 the length of the first non-insulating surface 204 in the up and down direction in Figure 4 ), and the height of the second non-insulating surface 202 refers to the length of the second non-insulating surface 202 along the axial direction of the yoke 103 (for example

[0081] the length of the second non-insulating surface 202 in the up and down direction in Figure 8 and Figure 10 ). And along the circumferential direction of the yoke 103, the lengths of the first non-insulating surface 204 and the second non-insulating surface 202 can be equal. Figure 10 For example, Figure 10 there are a total of four first avoidance grooves 303 in Figure 10 . The upper left first avoidance groove 303 and the lower left first avoidance groove 303 form a first avoidance groove group, and the upper right first avoidance groove 303 and the lower right first avoidance groove 303 form a first avoidance groove group. It should be noted that Figure 7 and Figure 10 the dotted lines in

[0082] are mainly used to distinguish the first non-insulating surface 204. The two first avoidance groove groups do not communicate with each other. Combining Figure 7 and Figure 10 , the two first avoidance groove groups are arranged separately along the circumferential direction of the yoke 103, so that the protruding body 106 has a holding part 110. Along the axial direction of the yoke 103, the end face of the protruding body 106 and the end face of the mounting body 107 are insulated, and the holding part 110 can hold the enameled wire 402 to prevent the enameled wire 402 from moving along the axial direction of the yoke 103 and contacting the first non-insulating surface 204 or the second non-insulating surface 202.Meanwhile, the wall surface of the first avoidance groove 303 is coated with an insulating material. The setting of the first avoidance groove 303 leaves enough electrical safety clearance between the enameled wire 402 and the first non-insulating surface 204 or the second non-insulating surface 202 (viewed along the axial direction of the yoke portion 103). Considering the commonly used low voltage electricity, along the axial direction of the yoke portion 103, the depth of the first avoidance groove 303 is not less than 0.5 mm (D4≥0.5 mm) to ensure that the first avoidance groove 303 can provide enough electrical clearance.

[0083] It should be noted that in some embodiments, in order to make the first non-insulating surface 204 completely cover the second non-insulating surface 202, the length of the first non-insulating surface 204 along the axial direction of the yoke portion 103 is equal to the length of the second non-insulating surface 202, and the length of the first non-insulating surface 204 along the circumferential direction of the yoke portion 103 is greater than the length of the second non-insulating surface 202. As mentioned above, at this time, L<D1 can be made; and at the same time, a first avoidance groove group is set, because even if the height of the second non-insulating surface 202 is designed to be the same as the height of the first non-insulating surface 204, during the production process, due to assembly errors or production errors, a part of the first non-insulating surface 204 or the second non-insulating surface 202 may be exposed along the axial direction of the yoke portion 103. To reduce the risk of insulation failure of the stator core 101, a first avoidance groove group can still be set at this time.

[0084] In some embodiments, in order to make the first non-insulating surface 204 completely cover the second non-insulating surface 202, the length of the first non-insulating surface 204 along the circumferential direction of the yoke portion 103 is equal to the length of the second non-insulating surface 202, and the length of the first non-insulating surface 204 along the axial direction of the yoke portion 103 is greater than the length of the second non-insulating surface 202. Assembly or production errors may cause a part of the first non-insulating surface 204 along the circumferential direction of the yoke portion 103 to be exposed in the actually produced stator core 101; therefore, in this case, a first avoidance groove group can be set and L<D1 can also be set to reduce the risk of insulation failure of the stator core 101.

[0085] If the length of the first non-insulating surface 204 along the circumferential direction of the yoke portion 103 is greater than the length of the second non-insulating surface 202, and the length of the first non-insulating surface 204 along the axial direction of the yoke portion 103 is also greater than the length of the second non-insulating surface 202, then a first avoidance groove group should be set in the stator core 101 and L<D1 should be set.

[0086] Refer to Figure 9, in some embodiments, the outer iron core 105 has two second avoidance groove groups, each second avoidance groove group includes two second avoidance grooves 304, and the arrangement of the second avoidance grooves 304 leaves sufficient electrical safety clearance between the enameled wire 402 and the first non-insulating surface 204 or the second non-insulating surface 202. Along the axial direction of the yoke portion 103, the two second avoidance grooves 304 of the same second avoidance groove group are arranged at both ends of a second non-insulating surface 202. Taking Figure 11 as an example, Figure 11 there are a total of four second avoidance grooves 304. The second avoidance groove 304 in the upper left corner and the second avoidance groove 304 in the lower left corner form a second avoidance groove group, and the second avoidance groove 304 in the upper right corner and the second avoidance groove 304 in the lower right corner form a second avoidance groove group.

[0087] Referring to Figure 4 and Figure 9 , the outer iron core 105 includes a combined body 109 and a base body 108. The side of the base body 108 facing the tooth portion 104 has a blocking surface 201, the side of the combined body 109 facing the tooth portion 104 has a second non-insulating surface 202, and the base body 108 is provided with an installation groove 302, and the installation groove 302 is located between the two combined bodies 109. Along the axial direction of the yoke portion 103, both ends of the combined body 109 are retracted relative to both ends of the base body 108, so as to form a second avoidance groove 304 in the outer iron core 105. When a blocking groove 301 is provided in the outer iron core 105, the second avoidance groove 304 can communicate with the blocking groove 301. The wall surface of the second avoidance groove 304 is coated with an insulating material, and the second avoidance groove 304 provides an electrical clearance. Considering the commonly used low voltage, along the axial direction of the yoke portion 103, the depth of the second avoidance groove 304 is not less than 0.5 mm (D6≥0.5 mm). In addition, along the axial direction of the yoke portion 103, the depths of the second avoidance groove 304 and the first avoidance groove 303 do not necessarily need to be equal (that is, D4 and D6 do not necessarily need to be equal), as long as it is ensured that the second non-insulating surface 202 is completely covered by the first non-insulating surface 204.

[0088] Referring to Figure 6 or Figure 12 , in these two embodiments, only the first non-insulating surface 204 of the inner joint surface 205 contacts the second non-insulating surface 202 of the outer iron core 105, and other regions (such as the insulating surface) of the inner joint surface 205 do not contact the outer iron core 105. This can prevent poor contact between the first non-insulating surface 204 and the second non-insulating surface 202 caused by processing errors, so as to ensure the magnetic conduction effect between the tooth portion 104 and the outer iron core 105. Taking Figure 6 and Figure 7For example, assuming that the blocking groove 301 is filled and the blocking surface 201 extends to be connected to the second non-insulating surface 202, then the blocking surface 201 and the second non-insulating surface 202 belong to the same curved surface or plane, and a part of the blocking surface 201 will also be in contact with the inner bonding surface 205. If set in this way, it is easy to have a situation where the blocking surface 201 is in contact with the insulating surface 203 due to poor surface flatness, but there is a gap between the first non-insulating surface 204 and the second non-insulating surface 202; the magnetic permeability of air is very low, and the gap between the first non-insulating surface 204 and the second non-insulating surface 202 will affect the magnetic conduction between the tooth part 104 and the outer iron core 105.

[0089] In the case where the first avoidance groove 303 is provided in the inner iron core 102, the inner iron core 102 can be formed by stacking two types of punching sheets with different sizes. For example, referring to Figure 15 and Figure 16 , a type-I punching sheet 403 and a type-II punching sheet 404 can be set, where the length of the region of the type-I punching sheet 403 corresponding to the protruding body 106 is slightly shorter than the length of the region of the type-II punching sheet 404 corresponding to the protruding body 106 (D7 < D8). When stacking the punching sheets to form the inner iron core 102, the type-I punching sheet 403 is set at the top and the bottom. Similarly, if the outer iron core 105 is also formed by stacking punching sheets, two types of punching sheets with slightly different sizes can also be considered, which will not be described repeatedly here. It should be noted that after obtaining the punching sheets as shown in Figure 15 or Figure 16 through the stamping process, the punching sheets also need to be bent and wound around a mold so that the punching sheets are connected end to end to form an annular punching sheet. In addition, the width of the part of the punching sheet corresponding to the tooth part 104 is D9, and the groove width between the parts of the punching sheet corresponding to the tooth part 104 is D 10 (specifically, the type-I punching sheet 403 in Figure 15 can be referred to), and it should satisfy: 1.0 mm ≤ D9 - D 10 ≤ 3.0 mm; this can improve the material utilization rate while ensuring the processing accuracy of the punching sheet.

[0090] In addition, the outer iron core 105 is equivalent to the boot part of the stator iron core 101. The outer iron core 105 is relatively flat and extends along the circumferential direction of the yoke part 103. If the stator iron core 101 does not adopt the design of separating the teeth and boots and the stator iron core 101 is formed by stacking punching sheets, then the punching sheet must include the part corresponding to the outer iron core 105 (or the corresponding boot part), which will waste a lot of materials. Referring to Figure 15 , in the case of not adopting the design of separating the teeth and boots, the punching sheet of the iron core needs to include the part corresponding to the boot part. Since the punching sheet includes the part corresponding to the boot part, then D 10It needs to be much larger than D9, which will result in a large amount of material being wasted. When adopting the tooth-boot separation design, the punching sheets for forming the inner iron core 102 and the punching sheets for forming the outer iron core 105 can be processed independently. The shape of the punching sheets corresponding to the inner iron core 102 does not need to include the parts corresponding to the boots, and the difference between D 10 and D9 can be set to be smaller to improve the material utilization rate.

[0091] When the barrier groove 301 is provided on the outer iron core 105, the blocking wall 305 can be coated with an insulating material, which can reduce the risk of insulation failure between the stator iron core 101 and the enameled wire 402. Normally, the enameled wire 402 will not enter the barrier groove 301 as a whole, but a part of the enameled wire 402 may be squeezed into the barrier groove 301 and come into contact with the blocking wall 305, resulting in insulation failure between the enameled wire 402 and the stator iron core 101. If the blocking wall 305 is insulated, even if the enameled wire 402 comes into contact with the blocking wall 305, insulation failure will not occur. To further reduce the risk of insulation failure and the control difficulty in the process, insulating materials can also be directly coated on all the walls of the barrier groove 301.

[0092] Referring to Figure 8 , in some embodiments, the inner joint surface 205 further includes an insulating surface 203. The insulating surface 203 is connected to the first non-insulating surface 204, and along the circumferential direction of the yoke portion 103, the insulating surface 203 is connected to the outer edge of the first non-insulating surface 204. The insulating surface 203 is also coated with an insulating material. The provision of the insulating surface 203 on the inner joint surface 205 can further improve the effectiveness of the insulation design, thus ensuring the safe use of the motor. Similar to the groove wall of the barrier groove 301, there is actually still a relatively high risk of contact between the edge part of the inner joint surface 205 and the enameled wire 402. Setting the edge part of the inner joint surface 205 to be insulating can reduce the risk of insulation failure of the stator iron core 101.

[0093] In addition, for the stator iron core 101, the parts on the outer surface of the stator iron core 101 that are in direct contact with the winding 401 or may come into contact with the winding 401 can all be coated with an insulating material to ensure the insulation between the winding 401 and the stator iron core 101.

[0094] For example, for the outer iron core 105, the end faces at both ends along the axial direction of the yoke portion 103 can be coated with an insulating material to Figure 4 take as an example, the end faces at the upper and lower ends of the outer iron core 105 can both be coated with an insulating material.

[0095] For the inner iron core 102, the end faces at both ends along the axial direction of the yoke portion 103, the surface of the yoke portion 103 on the side facing the tooth portion 104, and the end faces at both ends along the circumferential direction of the protruding body 106 can all be coated with an insulating material. TakingFigure 8 For example, the end faces at the left and right ends of the protruding body 106 can be coated with insulating materials. Figure 3 For example, the surface of the yoke portion 103 facing the tooth portion 104 can be coated with insulating materials, and the end faces at the upper and lower ends of the inner iron core 102 can be coated with insulating materials; the end faces at the upper and lower ends of the inner iron core 102 described herein include the end faces at the upper and lower ends of the yoke portion 103, include the end faces at the upper and lower ends of the protruding body 106, and also include the end faces at the upper and lower ends of the mounting body 107.

[0096] In addition, the surface of the outer iron core 105 on the side facing away from the tooth portion 104 (if Figure 4 taking... as an example, it is the front surface of the base body 108), usually does not come into contact with the enameled wire 402, and the surface of this part can be not coated with insulating materials.

[0097] The present invention also provides a stator 405, and the stator 405 includes the stator iron core 101 in the above embodiment. The stator 405 further includes a winding 401, and the winding 401 is sleeved outside the tooth portion 104 of the stator iron core 101. In this stator 405, the enameled wire 402 is not likely to come into contact with the non-insulated joint surface (i.e., the first non-insulated surface 204) of the tooth portion 104, the insulation between the stator iron core 101 and the winding 401 is not likely to fail, and the safety of the stator 405 is relatively good.

[0098] The present invention also provides a motor, and the motor includes the stator 405 in the above embodiment. The motor further includes a rotor. If the stator iron core 101 is arranged in the form of Figure 1 ..., then the motor is an outer-rotor motor, that is, the rotor surrounds the periphery of the stator 405. The motor can also be an inner-rotor motor. Correspondingly, in the stator iron core 101, the outer iron core 105 and the tooth portion 104 are arranged inside the yoke portion 103 ( Figure 1 in..., the outer iron core 105 and the tooth portion 104 are arranged outside the yoke portion 103), and the stator 405 surrounds the periphery of the rotor.

[0099] In this motor, the enameled wire 402 is not likely to come into contact with the non-insulated joint surface (i.e., the first non-insulated surface 204) of the tooth portion 104, the insulation between the stator iron core 101 and the winding 401 is not likely to fail, and the safety of the motor is relatively good.

[0100] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. Stator core, characterized in that, Comprising: An inner iron core, including a yoke portion and tooth portions, the yoke portion being annular, the tooth portions being for mounting windings, the tooth portions being connected to the yoke portion and protruding radially from the yoke portion, one end of the tooth portions away from the yoke portion having an inner joint surface, the inner joint surface including a first non-insulating surface; An outer iron core, connected to one end of the tooth portions away from the yoke portion, one side of the outer iron core facing the yoke portion having a second non-insulating surface and an insulating blocking surface that are separated from each other, the first non-insulating surface being in contact with and covering the second non-insulating surface; The outer iron core has a barrier groove, along the circumferential direction of the yoke portion, the blocking surface and the second non-insulating surface being separated by the barrier groove; a side wall surface of the barrier groove close to the blocking surface is a blocking wall, and the minimum distance between an end surface of the tooth portion along the circumferential direction of the yoke portion and the blocking wall is L, and the minimum wire diameter of the winding is D1, satisfying: L < D1.

2. The stator core according to claim 1, characterized in that, Along the circumferential direction of the yoke portion, the blocking surface deviates from the tooth portion relative to the second non-insulating surface, and the tooth portion blocks a part of the barrier groove; the blocking wall is insulating.

3. The stator core according to claim 1, characterized in that, The tooth portion has a mounting body, the mounting body protruding radially from the inner joint surface along the yoke portion, and the outer iron core has a mounting groove, and the mounting body is arranged in the mounting groove.

4. The stator core according to claim 3, characterized in that, The groove wall of the mounting groove is in contact with the outer surface of the mounting body and realizes magnetic conduction.

5. The stator core according to claim 1, characterized in that, Along the circumferential direction of the yoke portion, the first non-insulating surface is longer than the second non-insulating surface.

6. The stator core according to claim 1, characterized in that, The inner joint surface includes an insulating surface, and along the circumferential direction of the yoke portion, the insulating surface is connected to the outer edge of the first non-insulating surface.

7. The stator core according to claim 1, characterized in that, The number of the outer iron cores is less than the number of the tooth portions, and each outer iron core is connected to a plurality of the tooth portions.

8. The stator core according to claim 3, characterized in that, The tooth portion has two first avoidance groove groups, the two first avoidance groove groups are respectively located on both sides of the mounting body, the first avoidance groove group includes two first avoidance grooves, along the axial direction of the yoke portion, the two first avoidance grooves in the same first avoidance groove group are arranged at both ends of a first non-insulating surface, and the groove walls of the first avoidance grooves are insulating.

9. The stator core according to claim 8, characterized in that, The outer iron core has two second avoidance groove groups, the two second avoidance groove groups are respectively located on both sides of the mounting groove, the second avoidance groove group includes two second avoidance grooves, along the axial direction of the yoke portion, the two second avoidance grooves in the same second avoidance groove group are arranged at both ends of a second non-insulating surface, and the groove walls of the second avoidance grooves are insulating.

10. Stator core, characterized in that, Comprising: An inner iron core, including a yoke portion and tooth portions, the yoke portion being annular, the tooth portions being for mounting windings, the tooth portions being connected to the yoke portion and protruding radially from the yoke portion, one end of the tooth portions away from the yoke portion having an inner joint surface, the inner joint surface including a first non-insulating surface; An outer iron core, connected to one end of the tooth portions away from the yoke portion, one side of the outer iron core facing the yoke portion having a second non-insulating surface and an insulating blocking surface that are separated from each other, the first non-insulating surface being in contact with and covering the second non-insulating surface; Radially along the yoke, the blocking surface is spaced from the first non-insulating surface, and the minimum distance between the edge of the inner bonding surface along the circumferential direction of the yoke and the blocking surface is L, and the minimum wire diameter of the winding is D1, satisfying: L < D1.

11. The stator core according to claim 10, characterized in that, The tooth portion has a mounting body, the mounting body protrudes radially along the yoke relative to the inner bonding surface, the outer iron core has a mounting groove, and the mounting body is disposed in the mounting groove.

12. The stator core according to claim 11, characterized in that, The groove wall of the mounting groove contacts the outer surface of the mounting body and realizes magnetic conduction.

13. The stator core according to claim 10, characterized in that, Along the circumferential direction of the yoke, the first non-insulating surface is longer than the second non-insulating surface.

14. The stator core according to claim 10, characterized in that, The inner bonding surface includes an insulating surface, and along the circumferential direction of the yoke, the insulating surface is connected to the outer edge of the first non-insulating surface.

15. The stator core according to claim 10, characterized in that, The number of the outer iron cores is less than the number of the tooth portions, and each outer iron core is connected to a plurality of the tooth portions.

16. The stator core according to claim 11, characterized in that, The tooth portion has two first avoidance groove groups, the two first avoidance groove groups are respectively located on both sides of the mounting body, the first avoidance groove group includes two first avoidance grooves, and along the axial direction of the yoke, the two first avoidance grooves in the same first avoidance groove group are arranged at both ends of a first non-insulating surface, and the groove walls of the first avoidance grooves are insulated.

17. The stator core according to claim 16, characterized in that, The outer iron core has two second avoidance groove groups, the two second avoidance groove groups are respectively located on both sides of the mounting groove, the second avoidance groove group includes two second avoidance grooves, and along the axial direction of the yoke, the two second avoidance grooves in the same second avoidance groove group are arranged at both ends of a second non-insulating surface, and the groove walls of the second avoidance grooves are insulated.

18. Stator, characterized in that,Comprising a stator core according to any one of claims 1 to 17.

19. Electric motor, characterized in that, Comprising a stator according to claim 18.

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