Back-wound stator, back-wound stator assembly and motor

Abstract

The present disclosure provides a back-wound stator, a back-wound stator assembly and a motor. The back-wound stator comprises: a yoke part, stator outer teeth, stator inner teeth, stator outer slots and stator inner slots; the stator outer teeth and the stator inner teeth are opposite on a one-to-one basis along the radial direction, and the stator outer slots and the stator inner slots are also opposite on a one-to-one basis along the radial direction; the connection positions of the outer periphery of the yoke part and the stator outer slots are recessed to form first assembly slots, and the connection positions of the inner periphery of the yoke part and the stator inner slots are recessed to form second assembly slots; the first assembly slots can be in insertion fit with one of support legs of an insulating part; and the second assembly slots can be in insertion fit with one of support legs of the insulating part. According to the present disclosure, assembly slots for insulating plate support legs are reserved at the bottom of stator slots (i.e., the position of the yoke part), so that the insulating plate support legs do not occupy the space in original stator slots, the slot fill factors of two ends of the stator are not changed, in addition, the insulating plate support legs are allowed to be designed to be thicker, so that the structural strength thereof is improved.

Description

Back-wound stator, back-wound stator assembly and motor

[0001] This disclosure claims priority to the Chinese patent application filed with the China Patent Office on November 22, 2023, with application number 202311563943.0 and invention name “A back-wound stator, back-wound stator assembly and motor”, the entire contents of which are incorporated by reference into this disclosure. Technical Field

[0002] The present disclosure relates to the technical field of motors, and in particular to a back-wound stator, a back-wound stator assembly, and a motor. Background Art

[0003] High-speed permanent magnet generators (PMGs) are a hot topic in the international electrical engineering field due to their high power density, high transmission efficiency, zero excitation loss, and high efficiency. However, due to their high speed, small number of pole pairs, and large pitch, these generators have high coil heights and poor heat dissipation at the ends, leading to localized overheating and reduced motor life.

[0004] To address the end heat dissipation issue, most current high-speed motors use back-wound windings. This structure significantly reduces the coil height and heat generation of the motor end windings. However, because the windings must be connected across the inner and outer slots during winding insertion, the insulation distance between the winding and the core is short. Furthermore, the sharp edges of the core can wear off the paint during winding, making back-wound stators prone to short-circuit burnouts.

[0005] The insulation structure shown in Figures 1 and 2 was used in related technologies to solve the above problem: an insulating plate was added to the end face, and the insulating plate was clamped at the bottom of the inner and outer teeth of the stator by four legs. When the stator was offline, the bridge part of the inner and outer slots rested on the insulating plate, which increased the insulation between the winding and the iron core and prevented the copper wire from being scratched by the iron core.

[0006] Since the four legs of the insulating plate of the above-mentioned back-wound motor in the related art, if designed to be thicker, will occupy the space in the slot, resulting in a high slot fill rate at both ends of the iron core and difficulty in threading and inserting wedges into the slots; if designed to be thinner, there will be technical problems such as insufficient strength and easy breakage. Therefore, the present invention studies and designs a back-wound stator, a back-wound stator assembly and a motor.

[0007] Summary of the Invention

[0008] Therefore, the technical problem to be solved by the present disclosure is to overcome the defects of the back-wound motor in the related art, such as the high slot filling rate at both ends of the iron core and the difficulty in lowering the wire and inserting the wedge into the slot due to the insulation plate legs occupying the space in the slot, thereby providing a back-wound stator, a back-wound stator assembly and a motor.

[0009] In order to solve the above problems, the present disclosure provides a back-wound stator, which includes:

[0010] A yoke, stator outer teeth, stator inner teeth, stator outer slots and stator inner slots, the yoke is an annular structure, the stator outer teeth are connected to the radial outer periphery of the yoke and extend radially outward, the stator inner teeth are connected to the radial inner periphery of the yoke and extend radially inward, the stator outer teeth are multiple, and the multiple stator outer teeth are arranged in sequence along the circumferential direction, the stator outer slot is formed between two adjacent stator outer teeth, the stator inner teeth are multiple, and the multiple stator inner teeth are arranged in sequence along the circumferential direction, the adjacent two stator outer teeth are The stator inner slots are formed between the stator inner teeth, the stator outer teeth are opposite to the stator inner teeth one by one in the radial direction, the stator outer slots are also opposite to the stator inner slots one by one in the radial direction, and a first assembly groove is formed by a recess at the junction of the outer periphery of the yoke and the stator outer slots, and a second assembly groove is formed by a recess at the junction of the inner periphery of the yoke and the stator inner slots, the first assembly groove can be plugged and matched with one of the legs of the insulating part, and the second assembly groove can be plugged and matched with one of the legs of the insulating part.

[0011] In some embodiments,

[0012] The first assembly groove is a groove formed by being recessed radially inward from the outer circumferential surface of the circular ring of the yoke, and the first assembly groove is connected to the outer groove of the stator. The second assembly groove is a groove formed by being recessed radially outward from the inner circumferential surface of the circular ring of the yoke, and the second assembly groove is connected to the inner groove of the stator.

[0013] In some embodiments,

[0014] There are at least two first assembly grooves, one of which is located at one circumferential end of the stator outer slot and connected to the stator external teeth at the one circumferential end, and the other is located at the other circumferential end of the stator outer slot and connected to the stator external teeth at the other circumferential end;

[0015] There are at least two second assembly grooves, one of which is located at one circumferential end of the stator inner slot and connected to the stator internal teeth at one circumferential end, and one of which is located at the other circumferential end of the stator inner slot and connected to the stator internal teeth at the other circumferential end.

[0016] In some embodiments,

[0017] The stator outer teeth and the stator inner teeth form a group of stator teeth, the stator outer slots and the stator inner slots form a group of stator slots, the two first assembly slots and the two second assembly slots form a group of assembly slots, and there are multiple stator teeth, and the multiple stator teeth are arranged at intervals along the circumferential direction of the yoke. There are also multiple stator teeth, and the multiple stator slots are also arranged at intervals along the circumferential direction of the yoke. The number of stator slots is equal to the number of stator teeth, and there are also multiple assembly slots, and the number of assembly slots is equal to the number of stator slots and they are arranged in a one-to-one correspondence with the stator slots.

[0018] The present disclosure also provides a back-wound stator assembly, which includes the aforementioned back-wound stator, and also includes an insulating part and a winding, the insulating part includes legs, one of which is plug-fitted into the first assembly slot, and one of which is plug-fitted into the second assembly slot, and the winding is wound between the stator inner slot and the stator outer slot via the surface of the insulating part.

[0019] In some embodiments,

[0020] When there are at least two first assembly grooves, one of the first assembly grooves is located at one circumferential end of the stator outer slot and is connected to the stator external teeth at the one circumferential end, and one of the first assembly grooves is located at the other circumferential end of the stator outer slot and is connected to the stator external teeth at the other circumferential end;

[0021] When there are at least two second assembly grooves, one of which is located at one circumferential end of the stator inner slot and in contact with the stator inner teeth at the one circumferential end, and one of which is located at the other circumferential end of the stator inner slot and in contact with the stator inner teeth at the other circumferential end:

[0022] The insulating part has at least four legs, one of which is plugged into and matched with a first assembly groove located at one circumferential end of the stator outer slot and connected to the stator outer teeth, one of which is plugged into and matched with a first assembly groove located at the other circumferential end of the stator outer slot and connected to the stator outer teeth, one of which is plugged into and matched with a second assembly groove located at one circumferential end of the stator inner slot and connected to the stator inner teeth, and one of which is plugged into and matched with a second assembly groove located at the other circumferential end of the stator inner slot and connected to the stator inner teeth.

[0023] In some embodiments,

[0024] The insulating portion includes interphase insulating plates and multi-connected insulating plates, which are alternately arranged in the circumferential direction. The interphase insulating plates are arranged on the first assembly groove and the second assembly groove through their insulating legs to insulate the windings of different phases. One multi-connected insulating plate is arranged in the area of ​​the stator teeth and stator slots of the same phase. The multi-connected insulating plate has multiple insulating legs, and its multiple insulating legs are respectively plugged into the first assembly groove and the second assembly groove in the area of ​​the same phase to insulate the iron core and the winding in the area of ​​the same phase.

[0025] In some embodiments,

[0026] In the interphase region, the number of the plurality of insulating legs of the interphase insulating plate is equal to the total number of the first assembly grooves and the second assembly grooves in the region, and the plurality of insulating legs of the interphase insulating plate are respectively opposite to the first assembly grooves and the second assembly grooves one by one and form a plug-fitting fit;

[0027] In the area of ​​the stator teeth and stator slots of the same phase, the number of the multiple insulating legs of the multi-unit insulating plate is equal to the total number of the first assembly grooves and the second assembly grooves in the area, and the multiple insulating legs of the multi-unit insulating plate are respectively opposite to the first assembly grooves and the second assembly grooves one by one and form a plug-in fit.

[0028] In some embodiments,

[0029] The interphase insulating plate includes an interphase plate, an interphase insulating member and an interphase leg. The interphase insulating member is arranged on one side of the interphase plate, and the interphase leg is arranged on the other side of the interphase plate. The interphase legs are respectively plugged into the first assembly groove and the second assembly groove to be fixed on the back-wound stator. The interphase insulating member protrudes in a direction away from the interphase plate to insulate the windings of different phases.

[0030] In some embodiments,

[0031] The interphase plate includes a first fan-shaped portion and a first strip-shaped portion, the first fan-shaped portion is connected to a position between the two ends of the first strip-shaped portion, the first fan-shaped portion is opposite to the yoke portion and can be fitted together, the integral part of the stator internal teeth plus the stator external teeth is opposite to the first strip-shaped portion and can be fitted together; the interphase legs are all arranged on the first fan-shaped portion.

[0032] In some embodiments,

[0033] There are four interphase legs, two of which are located on the radial outside and are plugged into the first assembly grooves on both sides of the stator outer teeth in the circumferential direction, that is, one of the interphase legs located on the radial outside is plugged into the first assembly groove on one side of the circumferential stator outer teeth of the phase, and the other interphase leg located on the radial outside is plugged into the first assembly groove on the other side of the circumference of the stator outer teeth, and two of which are located on the radial inside are plugged into the second assembly grooves on both sides of the circumferential stator inner teeth, that is, one of the interphase legs located on the radial inside is plugged into the second assembly groove on one side of the circumferential stator inner teeth of the phase, and the other interphase leg located on the radial inside is plugged into the second assembly groove on the other side of the circumference of the stator inner teeth; the interphase insulating parts are axially opposite to the stator outer teeth and the stator inner teeth respectively.

[0034] In some embodiments,

[0035] The multi-unit insulating plate includes a multi-unit plate and a multi-unit support leg. The multi-unit support leg is arranged on one side plate surface of the multi-unit plate and protrudes toward the stator. The multi-unit support leg is respectively plugged into the first assembly groove and the second assembly groove to be fixed on the back-wound stator.

[0036] In some embodiments,

[0037] The multi-joint plate includes a second sector-shaped portion and a second strip-shaped portion, the second sector-shaped portion is connected to a position between the two ends of the second strip-shaped portion, there are at least two second strip-shaped portions, and at least two second strip-shaped portions are spaced apart along the circumferential direction, the second sector-shaped portion is respectively connected between the two ends of each second strip-shaped portion to connect more than two second strip-shaped portions into one, the second sector-shaped portion is opposite to the yoke portion and can be fitted together, the integral part of the stator inner teeth plus the stator outer teeth is opposite to the second strip-shaped portion and can be fitted together; the multi-joint legs are all arranged on the second sector-shaped portion.

[0038] In some embodiments,

[0039] There are 12 multi-legs, of which two multi-legs located on the radial outside are plugged into and matched with the first assembly grooves on both sides of the circumference of the first stator outer teeth, two multi-legs located on the radial outside are plugged into and matched with the first assembly grooves on both sides of the circumference of the second stator outer teeth, two multi-legs located on the radial outside are plugged into and matched with the first assembly grooves on both sides of the circumference of the third stator outer teeth, two multi-legs located on the radial inside are plugged into and matched with the second assembly grooves on both sides of the circumference of the first stator inner teeth, two multi-legs located on the radial inside are plugged into and matched with the second assembly grooves on both sides of the circumference of the second stator inner teeth, and two multi-legs located on the radial inside are plugged into and matched with the second assembly grooves on both sides of the circumference of the third stator inner teeth.

[0040] In some embodiments,

[0041] The number of slots N of the multi-connected insulating plate is Z / (m*2p)-1, where the number of slots N is the number of stator slots covered, Z is the number of stator slots, where one stator outer slot plus one stator inner slot is one stator slot, m is the number of stator phases, and p is the number of pole pairs; the multi-connected insulating plate has 4×N multi-connected legs.

[0042] In some embodiments,

[0043] There is an overlapping portion between the interphase insulating plate and the adjacent multi-unit insulating plate in the axial direction. The interphase insulating plate is provided with a first step structure on the surface of the overlapping portion facing the multi-unit insulating plate. The multi-unit insulating plate is provided with a second step structure on the surface of the overlapping portion facing the interphase insulating plate. The first step structure and the second step structure can form a snap-fit ​​fit to form a circumferential limit between the interphase insulating plate and the multi-unit insulating plate.

[0044] In some embodiments,

[0045] When the interphase insulating plate includes an interphase plate, an interphase insulating member, and an interphase leg, and the interphase plate includes a first fan-shaped portion and a first strip-shaped portion: the first step structure is provided on a side end surface of the first fan-shaped portion of the interphase insulating plate facing the interphase insulating member and in contact with a circumferential end portion of the first fan-shaped portion, the first step structure includes a first plane relatively close to the circumferential end portion of the first fan-shaped portion, a second plane relatively close to the interphase insulating member, and a first connecting surface connected between the first plane and the second plane, a height difference between the first plane and the second plane forming a step at the first connecting surface;

[0046] When the multi-unit insulation plate includes a multi-unit plate and a multi-unit leg, and the multi-unit plate includes a second sector-shaped portion and a second strip-shaped portion: the second step structure is provided on a side end surface of the second sector-shaped portion of the multi-unit insulation plate facing the multi-unit leg and connected to a circumferential end portion of the second sector-shaped portion, the second step structure includes a third plane relatively close to the circumferential end portion of the second sector-shaped portion, a fourth plane relatively close to the multi-unit leg, and a second connecting surface connected between the third plane and the fourth plane, the third plane and the fourth plane having a height difference, and a step is formed at the second connecting surface;

[0047] The third plane is in contact with the first plane, the first connecting surface is opposite to the circumferential end of the second sector-shaped portion, and the second connecting surface is opposite to the circumferential end of the first sector-shaped portion.

[0048] The present disclosure also provides a motor comprising the aforementioned back-wound stator assembly.

[0049] The present disclosure provides a back-wound stator, a back-wound stator assembly, and a motor with the following beneficial effects:

[0050] 1. The present invention forms a first assembly groove by a recess at the junction of the outer periphery of the yoke and the stator outer slot, and forms a second assembly groove by a recess at the junction of the inner periphery of the yoke and the stator inner slot. The first assembly groove can be plugged and matched with one of the legs of the insulating portion, and the second assembly groove can be plugged and matched with one of the legs of the insulating portion. Since the assembly groove for the insulating plate legs is reserved at the bottom of the stator slot (i.e., at the position of the yoke), the insulating plate legs do not occupy the space in the original stator slot and do not change the slot fill rate at both ends of the stator, thereby avoiding the situation where the slot fill rate at both ends of the iron core is high and the wire is not easily removed and the slot wedge is inserted. At the same time, the insulating plate legs can be designed to be thicker to improve their structural strength.

[0051] 2. The present disclosure also discloses that the insulating portion includes interphase insulating plates and multi-connected insulating plates. The interphase insulating plates and the multi-connected insulating plates are alternately arranged in the circumferential direction. The insulating plates are processed into two types. One type is located between the two groups of coils and is provided with radial insulating plates to isolate the two adjacent groups of coils to provide interphase insulation. The other type covers the end face range of all slots in a group of coils. The two types of insulating plates reduce the total number of insulating plates that need to be assembled while retaining a certain degree of processing accuracy, making it easier to assemble the insulating plates on the stator. This solves the problem in the related art that due to the excessive number of insulating plates, the insulating plates are easily dropped during the offline process after assembly due to movement of the stator or contact with hands or elbows. It also solves the problem in the related art that if a ring covering the entire end face is made, on the one hand, the processing difficulty is doubled due to size reasons, and on the other hand, the processing accuracy cannot ensure that each leg can be assembled in place.

[0052] 3. The present disclosure also provides that the interphase insulating plate and its adjacent multi-unit insulating plate have an overlapping portion in the axial direction, and the interphase insulating plate is provided with a first step structure on the surface of the overlapping portion facing the multi-unit insulating plate, and the multi-unit insulating plate is provided with a second step structure on the surface of the overlapping portion facing the interphase insulating plate. The first step structure and the second step structure can form a snap-fit ​​fit to form a circumferential limit between the interphase insulating plate and the multi-unit insulating plate, so that the edge portion between the two insulating plates forms an upper and lower layer staggered structure, and each layer has a certain gap in the circumferential direction to prevent mutual interference caused by tolerance accumulation, and at the same time, avoid axial insulation gaps that affect insulation performance. This solves the problem in the related art that after multiple insulating plates are spliced ​​along the circumferential direction, the accumulated tolerances will cause the finally assembled several insulating plates to interfere with each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] FIG1 is a front structural diagram of a back-wound stator assembly in the related art;

[0054] FIG2 is a schematic structural diagram of the insulating plate structure in FIG1 ;

[0055] FIG3 is a front structural diagram of a back-wound stator of the present disclosure;

[0056] FIG4 is a partial enlarged view of portion I in FIG3 ;

[0057] FIG5 is a front elevation structural diagram of the interphase insulation plate of the present disclosure;

[0058] FIG6 is an inverted structural diagram of the interphase insulation plate of the present disclosure;

[0059] FIG7 is a front elevation structural diagram of a multi-unit insulation panel disclosed herein;

[0060] FIG8 is an inverted structural diagram of a multi-unit insulation panel disclosed herein;

[0061] FIG9 is an exploded view of the assembly of the back-wound stator assembly (stator and insulation plate) of the present disclosure;

[0062] FIG10 is a perspective structural diagram of the back-wound stator assembly of the present disclosure after assembly;

[0063] FIG11 is a side or top view of the back-wound stator assembly of FIG10;

[0064] FIG12 is a partial enlarged view of part II in FIG11 .

[0065] The figures are marked as follows: 1. stator core; 1-1. yoke; 1-2. stator outer teeth; 1-3. stator inner teeth; 1-4. stator outer slot; 1-5. stator inner slot; 1-6. first assembly slot; 1-7. second assembly slot; 2. phase-to-phase insulating plate; 2-1. phase-to-phase plate; 2-11. first sector-shaped portion; 2-12. first strip-shaped portion; 2-2. phase-to-phase leg; 2-3-1. first plane; 2-3-2. second plane; 2-3-3. first connecting surface; 2-4. phase-to-phase insulating member; 3. multi-unit insulating plate; 3-1. multi-unit plate; 3-11. second sector-shaped portion; 3-12. second strip-shaped portion; 3-2. multi-unit leg; 3-3-1. third plane; 3-3-2. fourth plane; 3-3-3. second connecting surface. DETAILED DESCRIPTION

[0066] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0067] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0068] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0069] In the description of the present disclosure, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present disclosure and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present disclosure; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0070] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0071] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this disclosure.

[0072] In the production practice of related technologies (such as Figures 1-2), it was found that the insulation structure has the following defects:

[0073] 1. If the four legs of the insulation board are designed to be thicker, they will occupy the space in the slot, resulting in a high slot fill rate at both ends of the core, making it difficult to lower the wire and insert the wedge into the slot; if they are designed to be thinner, their strength will be insufficient and they will be easy to break;

[0074] 2. The insulation plates are hand-made parts with relatively low processing precision. After multiple insulation plates are spliced ​​along the circumference, the accumulated tolerances will cause the several insulation plates assembled in the final assembly to interfere with each other, requiring additional edge grinding to complete the entire ring assembly.

[0075] 3. If each insulating plate covers one slot, the total number is too large and can easily fall off during assembly due to stator movement or contact with hands or elbows. If it is made into a ring covering the entire end face, the processing difficulty will double due to size reasons, and the processing accuracy will not be able to ensure that each leg can be assembled in place. A feasible compromise solution is needed to avoid these two extreme situations.

[0076] As shown in FIG3-12 , the present disclosure provides a back-wound stator, which includes:

[0077] Yoke 1-1, stator outer teeth 1-2, stator inner teeth 1-3, stator outer slots 1-4 and stator inner slots 1-5, the yoke 1-1 is annular, the stator outer teeth 1-2 are connected to the radial outer periphery of the yoke 1-1 and extend radially outward, the stator inner teeth 1-3 are connected to the radial inner periphery of the yoke 1-1 and extend radially inward, there are multiple stator outer teeth 1-2, and the multiple stator outer teeth 1-2 are arranged in sequence along the circumferential direction, the stator outer slot 1-4 is formed between two adjacent stator outer teeth 1-2, there are multiple stator inner teeth 1-3, and the multiple stator inner teeth 1-3 are arranged in sequence along the circumferential direction, The stator inner slot 1-5 is formed between two adjacent stator inner teeth 1-3, the stator outer teeth 1-2 are opposite to the stator inner teeth 1-3 one by one in the radial direction, and the stator outer slot 1-4 is also opposite to the stator inner slot 1-5 one by one in the radial direction, and a first assembly groove 1-6 is formed by a recess at the junction of the outer periphery of the yoke 1-1 and the stator outer slot 1-4, and a second assembly groove 1-7 is formed by a recess at the junction of the inner periphery of the yoke 1-1 and the stator inner slot 1-5, the first assembly groove 1-6 can be plugged into and matched with one of the legs of the insulating part, and the second assembly groove 1-7 can be plugged into and matched with one of the legs of the insulating part.

[0078] The present invention forms a first assembly groove by a recess at the junction of the outer periphery of the yoke and the stator outer slot, and forms a second assembly groove by a recess at the junction of the inner periphery of the yoke and the stator inner slot. The first assembly groove can be plugged and matched with one of the legs of the insulating part, and the second assembly groove can be plugged and matched with one of the legs of the insulating part. Since the assembly groove of the insulating plate leg is reserved at the bottom of the stator slot (that is, at the position of the yoke), the insulating plate leg does not occupy the slot space of the original stator slot and does not change the slot filling rate at both ends of the stator, thereby avoiding the situation where the slot filling rate at both ends of the iron core is high and the line is not cut off and the slot wedge is difficult to insert. At the same time, the insulating plate leg can be designed to be thicker to improve its structural strength.

[0079] To address issues 1-3 of the aforementioned related art, the present disclosure provides a back-wound stator and its insulation structure, improving upon the prior art insulation plate. 1. Pre-installed mounting slots for the insulation plate legs are provided at the stator slot bottoms. This eliminates the difficulty associated with unloading the wiring caused by the legs occupying slot space, while also allowing for thicker insulation plate legs to ensure structural strength. The addition of insulation plate mounting slots at the stator slot bottoms allows the insulation plate legs to mate with the mounting slots, eliminating slot space occupation and maintaining the slot fill ratio at both ends of the stator.

[0080] 2. The present invention utilizes two types of insulating plates for machining: one located between two coil groups and provided with radial insulating plates to isolate the two adjacent coil groups and provide phase insulation; the other covers the end faces of all slots within a coil group. These two types of insulating plates reduce the total number of insulating plates required while maintaining a certain level of machining accuracy, making them easier to assemble onto the stator.

[0081] 3. The edge portion between the two insulating plates disclosed in the present invention is also designed with an upper and lower layer staggered structure, and each layer has a certain gap in the circumferential direction to prevent mutual interference caused by tolerance accumulation, and at the same time avoid axial insulation leakage affecting the insulation performance.

[0082] In some embodiments,

[0083] The first assembly groove 1-6 is a groove formed by being recessed radially inward from the outer circumferential surface of the circular ring of the yoke 1-1, and the first assembly groove 1-6 is connected to the stator outer groove 1-4. The second assembly groove 1-7 is a groove formed by being recessed radially outward from the inner circumferential surface of the circular ring of the yoke 1-1, and the second assembly groove 1-7 is connected to the stator inner groove 1-5.

[0084] This is the preferred structural form of the first assembly groove and the second assembly groove disclosed in the present invention. The first assembly groove is preferably formed into a groove structure from the outer circumferential surface of the circular ring of the yoke toward the radial inner groove, and the second assembly groove is preferably formed into a groove from the inner circumferential surface of the circular ring of the yoke toward the radial outer side. The stator slot space originally thrust-connected with the insulating plate can be transferred to the position of the original yoke, effectively saving the space occupied by the original stator slot, optimizing the full slot rate at both ends of the iron core, and reducing the difficulty of offline operation. In addition, the insulating plate legs can be made thicker and clamped in the first and second assembly grooves, thereby improving the structural strength of the insulating plate and the stator.

[0085] In some embodiments,

[0086] There are at least two first assembly grooves 1-6, one of which is located at one circumferential end of the stator outer slot 1-4 and connected to the stator outer tooth 1-2 at the one circumferential end, and one of which is located at the other circumferential end of the stator outer slot 1-4 and connected to the stator outer tooth 1-2 at the other circumferential end;

[0087] There are at least two second assembly grooves 1-7, one of which is located at one circumferential end of the stator inner slot 1-5 and connected to the stator inner tooth 1-3 at one circumferential end, and one of which is located at the other circumferential end of the stator inner slot 1-5 and connected to the stator inner tooth 1-3 at the other circumferential end.

[0088] This is a further preferred structural form of the first assembly groove and the second assembly groove disclosed in the present invention, that is, there can be multiple first assembly grooves and second assembly grooves respectively, one of which is located at one circumferential end of the stator outer groove and connected to the stator outer teeth, and a first assembly groove is located at the other circumferential end of the stator outer groove and connected to the stator outer teeth, so that at least two structural plug-ins are formed on the radial outer side of the insulating plate, a second assembly groove is located at one circumferential end of the stator inner groove and connected to the stator inner teeth, and a second assembly groove is located at the other circumferential end of the stator inner teeth and connected to the stator inner teeth, so that at least two structural plug-ins are formed on the radial inner side of the insulating plate, so that the insulating plate forms at least two circumferential positions on the radial inner and radial outer sides. The plug-in structure with the assembly groove is further effectively improved, the structural strength of the fit between the insulating plate and the stator is further improved, and the motor performance is further improved.

[0089] In some embodiments,

[0090] The stator outer teeth 1-2 and the stator inner teeth 1-3 form a group of stator teeth, the stator outer slots 1-4 and the stator inner slots 1-5 form a group of stator slots, the two first assembly slots 1-6 and the two second assembly slots 1-7 form a group of assembly slots, and there are multiple stator teeth, and the multiple stator teeth are arranged at intervals along the circumferential direction of the yoke 1-1, and there are also multiple stator teeth, and the multiple stator slots are also arranged at intervals along the circumferential direction of the yoke 1-1, the number of the stator slots is equal to the number of the stator teeth, and there are also multiple assembly slots, and the number of the assembly slots is equal to the number of the stator slots and is arranged one-to-one with the stator slots.

[0091] This is a further preferred matching relationship between the assembly slots, stator teeth and stator slots disclosed in the present invention, that is, there are multiple stator teeth, stator slots and assembly slots, the stator teeth correspond one-to-one between the stator slots, and the number of assembly slots and stator slots is also relative and one-to-one corresponding, so that an assembly slot can be effectively set at each stator slot position, thereby further enabling multiple insulating plates to be installed and fixed to multiple assembly slots connected to multiple stator slots, further improving the insulation performance between the winding and the iron core, reducing the slot fill rate, reducing the difficulty of offline, and further improving the structural strength of the matching between the insulating plate and the stator.

[0092] The present disclosure also provides a back-wound stator assembly, which includes the aforementioned back-wound stator, and also includes an insulating part and a winding, the insulating part includes legs, one of which is plug-fitted with the first assembly slot 1-6, and one of which is plug-fitted with the second assembly slot 1-7, and the winding is wound between the stator inner slot 1-5 and the stator outer slot 1-4 via the surface of the insulating part.

[0093] The back-wound stator assembly disclosed herein is formed with a first assembly groove by a recess at the junction of the outer periphery of the yoke and the stator outer slot, and a second assembly groove by a recess at the junction of the inner periphery of the yoke and the stator inner slot. The first assembly groove can be plugged and matched with one of the legs of the insulating part, and the second assembly groove can be plugged and matched with one of the legs of the insulating part. Since the assembly groove of the insulating plate leg is reserved at the bottom of the stator slot (that is, at the position of the yoke), the insulating plate leg will not occupy the slot space of the original stator slot, and the slot filling rate at both ends of the stator will not be changed, thereby avoiding the situation where the slot filling rate at both ends of the iron core is high and the line is not cut off and the slot wedge is difficult to insert. At the same time, the insulating plate leg can be designed to be thicker to ensure its structural strength and improve its structural strength.

[0094] In some embodiments,

[0095] When there are at least two first assembly grooves 1-6, one of the first assembly grooves 1-6 is located at one circumferential end of the stator outer slot 1-4 and is connected to the stator outer tooth 1-2 at the one circumferential end, and one of the first assembly grooves 1-6 is located at the other circumferential end of the stator outer slot 1-4 and is connected to the stator outer tooth 1-2 at the other circumferential end;

[0096] When there are at least two second assembly grooves 1-7, one of which is located at one circumferential end of the stator inner slot 1-5 and connected to the stator inner tooth 1-3 at the one circumferential end, and one of which is located at the other circumferential end of the stator inner slot 1-5 and connected to the stator inner tooth 1-3 at the other circumferential end:

[0097] The insulating part has at least four legs, one of which is plugged into and fitted with the first assembly slot 1-6 located at one circumferential end of the stator outer slot 1-4 and connected to the stator outer teeth 1-2, one of which is plugged into and fitted with the first assembly slot 1-6 located at the other circumferential end of the stator outer slot 1-4 and connected to the stator outer teeth 1-2, one of which is plugged into and fitted with the second assembly slot 1-7 located at one circumferential end of the stator inner slot 1-5 and connected to the stator inner teeth 1-3, and one of which is plugged into and fitted with the second assembly slot 1-7 located at the other circumferential end of the stator inner slot 1-5 and connected to the stator inner teeth 1-3.

[0098] This is a further preferred structural form of the first assembly groove and the second assembly groove of the present invention, which are respectively fitted and plugged into the thrust of the insulating part, that is, there can be multiple first assembly grooves and second assembly grooves, one of which is located at one circumferential end of the stator outer groove and connected to the stator outer teeth, and a first assembly groove is located at the other circumferential end of the stator outer groove and connected to the stator outer teeth, so that at least two structural plug-ins are formed on the radial outer side of the insulating plate, a second assembly groove is located at one circumferential end of the stator inner groove and connected to the stator inner teeth, and a second assembly groove is located at the other circumferential end of the stator inner teeth and connected to the stator inner teeth, so that at least two structural plug-ins are formed on the radial inner side of the insulating plate, so that the insulating plate forms at least two circumferential positions on the radial inner and radial outer sides. The plug-in structure with the assembly groove further effectively improves the structural strength of the fit between the insulating plate and the stator, and further improves the performance of the motor.

[0099] In some embodiments,

[0100] The insulating portion includes an interphase insulating plate 2 and a multi-unit insulating plate 3. The interphase insulating plates 2 and the multi-unit insulating plates 3 are alternately arranged in the circumferential direction. The interphase insulating plates 2 are arranged on the first assembly slots 1-6 and the second assembly slots 1-7 through their insulating legs to insulate the windings of different phases. One multi-unit insulating plate 3 is arranged in the area of ​​the stator teeth and stator slots of the same phase. The multi-unit insulating plate 3 has multiple insulating legs, and its multiple insulating legs are respectively plugged into the first assembly slots 1-6 and the second assembly slots 1-7 in the area of ​​the same phase to insulate the iron core and the winding in the area of ​​the same phase.

[0101] The present disclosure also discloses that the insulating part includes phase-to-phase insulating plates and multi-connected insulating plates. The phase-to-phase insulating plates and the multi-connected insulating plates are alternately arranged in the circumferential direction. The insulating plates are processed into two types. One type is located between the two groups of coils and is provided with radial insulating plates to isolate the two adjacent groups of coils to play a phase-to-phase insulation role; the other type covers the end face range of all slots in a group of coils. The two types of insulating plates reduce the total number of insulating plates that need to be assembled while retaining a certain processing accuracy, making it easier to assemble the insulating plates on the stator, solving the problem in the related art that the insulating plates are easily dropped due to stator movement or hand / elbow friction during the offline process after assembly due to the excessive number of insulating plates. It also solves the problem in the related art that if a ring covering the entire end face is made, on the one hand, the processing difficulty is doubled due to size reasons, and on the other hand, the processing accuracy is difficult to ensure that each leg can be assembled in place.

[0102] The stator core 1 disclosed in the present invention is additionally provided with insulating plate assembly slots on the basis of a conventional back-wound stator, so as to cooperate with the legs of the two insulating plates, while not occupying the space in the slots and not increasing the winding slot fill rate.

[0103] The present disclosure designs two types of insulating plates: an interphase insulating plate 2 has an interphase insulating member 2-4 arranged perpendicular to the interphase plate 2-1 on one side. The height h of the interphase insulating plate 2 can be adjusted according to the height of the coil across the inner and outer slots after the stator is actually wound. h is slightly lower than the coil height (1 to 2 mm lower), which can not only separate the windings of different phases but also does not affect the placement of the windings in the coiled part of the output end; on the other side opposite the interphase insulating member 2-4 are four interphase legs 2-2, which respectively cooperate with the first assembly slot 1-6 and the second assembly slot 1-7 on the stator core 1. Since they no longer occupy the space in the slot, the interphase legs 2-2 can be designed as cylindrical and appropriately thickened to increase their structural strength and reduce the probability of leg breakage.

[0104] In some embodiments,

[0105] In the interphase region, the number of the plurality of insulating legs of the interphase insulating plate 2 is equal to the total number of the first assembly grooves 1-6 and the second assembly grooves 1-7 in the region, and the plurality of insulating legs of the interphase insulating plate are respectively opposite to the first assembly grooves 1-6 and the second assembly grooves 1-7 one by one and form a plug-fitting fit;

[0106] In the area of ​​the stator teeth and stator slots of the same phase, the number of the multiple insulating legs of the multi-connected insulating plate 3 is equal to the total number of the first assembly slots 1-6 and the second assembly slots 1-7 in the area, and the multiple insulating legs of the multi-connected insulating plate are respectively opposite to the first assembly slots 1-6 and the second assembly slots 1-7 one by one and form a plug-in fit.

[0107] This is the preferred structural form in which the insulating legs of the interphase insulating plate and the multi-unit insulating plate disclosed in the present invention cooperate with the first and second assembly grooves respectively, that is, the insulating legs of an interphase insulating plate are equal to the total number of the first and second assembly grooves in the areas between different phases and are plugged in with each other, and the insulating legs of a multi-unit insulating plate are equal to the total number of the first and second assembly grooves in the area of ​​the same phase and are plugged in with each other, which effectively reduces the total number of insulating plates, further effectively solves the problem in the related art that due to the excessive number of insulating plates, they are easily dropped during the offline process after assembly due to movement of the stator or friction with hands / elbows, and also solves the problem in the related art that if a ring covering the entire end face is made, on the one hand, the processing difficulty is doubled due to size reasons, and on the other hand, the processing accuracy is difficult to ensure that each leg can be assembled in place.

[0108] In some embodiments,

[0109] The interphase insulating plate 2 includes an interphase plate 2-1, an interphase insulating member 2-4 and an interphase leg 2-2. The interphase insulating member 2-4 is arranged on one side of the interphase plate 2-1, and the interphase leg 2-2 is arranged on the other side of the interphase plate 2-1. The interphase leg 2-2 is respectively plugged into the first assembly groove 1-6 and the second assembly groove 1-7 to be fixed on the back-wound stator. The interphase insulating member 2-4 protrudes in the direction away from the interphase plate 2-1 to insulate the windings of different phases.

[0110] This is a further preferred structural form of the interphase insulating plate disclosed in the present invention. The interphase insulating member can serve as an insulating barrier for the windings between different phases. The interphase plate is mainly configured to connect the interphase insulating member and the interphase legs respectively. The interphase legs can be effectively inserted into the first and second assembly slots so that the interphase insulating plate is fixed to the stator slots.

[0111] In some embodiments,

[0112] The phase plate 2-1 includes a first fan-shaped portion 2-11 and a first strip-shaped portion 2-12. The first fan-shaped portion 2-11 is connected to a position between the two ends of the first strip-shaped portion 2-12. The first fan-shaped portion 2-11 is opposite to the yoke portion 1-1 and can fit together. The integral part of the stator inner teeth 1-3 plus the stator outer teeth 1-2 is opposite to the first strip-shaped portion 2-12 and can fit together. The phase legs 2-2 are all arranged on the first fan-shaped portion 2-11.

[0113] This is the preferred structural form of the phase plate disclosed in the present invention. The first fan-shaped portion can be relatively fitted with the yoke portion to form insulation between this part of the iron core and the winding. The first strip-shaped portion can be relatively fitted with the part of the stator inner teeth plus the stator outer teeth to insulate and block this part of the iron core. The first fan-shaped portion is also used to set the phase legs thereon, which are plugged into and matched with the first and second assembly slots opened at the yoke position to reduce the slot fill rate and reduce the difficulty of offline operation.

[0114] In some embodiments,

[0115] There are four interphase legs 2-2, two of which are located on the radial outside and are plugged into the first assembly grooves 1-6 on both sides of the stator outer teeth 1-2 in the circumferential direction, that is, one of the interphase legs 2-2 located on the radial outside is plugged into the first assembly groove 1-6 on one side of the stator outer teeth 1-2 in the circumferential direction, and the other interphase leg 2-2 located on the radial outside is plugged into the first assembly groove 1-6 on the other side of the stator outer teeth 1-2 in the circumferential direction, and the two interphase legs located on the radial inside are plugged into the first assembly groove 1-6 on the other side of the stator outer teeth 1-2 in the circumferential direction. The interphase legs 2-2 are plugged into and fitted with the second assembly grooves 1-7 on both circumferential sides of the stator inner teeth 1-3, that is, one of the interphase legs 2-2 located on the radial inner side is plugged into and fitted with the second assembly groove 1-7 located on one circumferential side of the interphase stator inner teeth 1-3, and the other interphase leg 2-2 located on the radial inner side is plugged into and fitted with the second assembly groove 1-7 on the other circumferential side of the stator inner teeth 1-3; the interphase insulating parts 2-4 are axially opposite to the stator outer teeth 1-2 and the stator inner teeth 1-3 respectively.

[0116] This is the preferred number of interphase legs and the first and second assembly grooves disclosed in the present invention, as well as the form of mutual plug-in cooperation, that is, the two radially outer phase legs of the four interphase legs are respectively opposite to and plug-in cooperate with the two first assembly grooves, and the two radially inner phase legs can be respectively opposite to and plug-in cooperate with the two second assembly grooves, effectively completing the setting form of the insulation plate between the two phase windings, and playing an effective insulating role and effect on the windings between the two phases.

[0117] In some embodiments,

[0118] The multi-unit insulating plate 3 includes a multi-unit plate 3-1 and a multi-unit support leg 3-2. The multi-unit support leg 3-2 is arranged on one side plate surface of the multi-unit plate 3-1 and protrudes toward the stator. The multi-unit support leg 3-2 is respectively plugged into the first assembly groove 1-6 and the second assembly groove 1-7 to be fixed on the back-wound stator.

[0119] This is a further preferred structural form of the multi-unit insulating plate disclosed in the present invention, in which the multi-unit plate is used as the main body to connect the multi-unit legs, and the multi-unit plate is used to effectively insulate and block the stator core and windings in the same phase. The multi-unit legs can be effectively inserted into the first and second assembly slots so that the multi-unit insulating plate is fixed to the stator slots.

[0120] In some embodiments,

[0121] The multi-joint plate 3-1 includes a second fan-shaped portion 3-11 and a second strip portion 3-12, the second fan-shaped portion 3-11 is connected to the position between the two ends of the second strip portion 3-12, there are at least two second strip portions 3-12, and at least two second strip portions 3-12 are distributed at intervals along the circumferential direction, the second fan-shaped portion 3-11 is respectively connected between the two ends of each second strip portion 3-12 to connect more than two second strip portions 3-12 into one, the second fan-shaped portion 3-11 is opposite to the yoke portion 1-1 and can be fitted together, the integral part of the stator inner teeth 1-3 plus the stator outer teeth 1-2 is opposite to the second strip portion 3-12 and can be fitted together; the multi-joint legs 3-2 are all arranged on the second fan-shaped portion 3-11.

[0122] This is the preferred structural form of the multi-unit plate disclosed in the present invention. The second fan-shaped portion can be relatively fitted with the yoke portion to form insulation between this part of the iron core and the winding. The second strip-shaped portion can be relatively fitted with the part of the stator inner teeth plus the stator outer teeth to insulate and block this part of the iron core. The second fan-shaped portion is also used to set multi-unit legs thereon, which are plugged into and matched with the first and second assembly slots opened at the yoke position to reduce the slot fill rate and reduce the difficulty of offline operation.

[0123] In some embodiments,

[0124] There are 12 multi-legs 3-2, of which two multi-legs 3-2 located in the radial outside are plugged into and matched with the first assembly grooves 1-6 on both sides of the circumference of the first stator outer tooth 1-2, two multi-legs 3-2 located in the radial outside are plugged into and matched with the first assembly grooves 1-6 on both sides of the circumference of the second stator outer tooth 1-2, two multi-legs 3-2 located in the radial outside are plugged into and matched with the first assembly grooves 1-6 on both sides of the circumference of the third stator outer tooth 1-2, two multi-legs 3-2 located in the radial inside are plugged into and matched with the second assembly grooves 1-7 on both sides of the circumference of the first stator inner tooth 1-3, two multi-legs 3-2 located in the radial inside are plugged into and matched with the second assembly grooves 1-7 on both sides of the circumference of the second stator inner tooth 1-3, and two multi-legs 3-2 located in the radial inside are plugged into and matched with the second assembly grooves 1-7 on both sides of the circumference of the third stator inner tooth 1-3.

[0125] This is the preferred number of multi-legs and the first and second assembly grooves disclosed in the present invention, as well as the form of mutual plug-in cooperation, that is, the 6 radially outer legs of the 12 inter-phase legs in the same phase winding are respectively opposite to and plug-in cooperated with the 6 first assembly grooves, and the 6 radially inner multi-legs can be respectively opposite to and plug-in cooperated with the 6 second assembly grooves, effectively completing the setting form of the insulation plate between the same phase winding and the iron core, and playing an effective insulating role and effect on the winding and iron core inside the same phase.

[0126] In some embodiments,

[0127] The number of slots N spanning a multi-connected insulating plate 3 is Z / (m*2p)-1, where N represents the number of stator slots covered, Z represents the number of stator slots (one stator slot is equal to one outer stator slot plus one inner stator slot), m represents the number of stator phases (typically three phases, i.e., m=3), and p represents the number of pole pairs. The multi-connected insulating plate 3 has 4×N multi-connected legs 3-2. The multi-connected insulating plate 3 is composed of multiple conventional insulating plates connected circumferentially to form a single unit.

[0128] The present disclosure uses the above-mentioned slot number N as Z / (m*2p)-1 to calculate the number of stator slots covered by a multi-unit insulating plate in the same phase under different stator slot numbers, different phase numbers, and different pole pairs. Therefore, the width of the multi-unit insulating plate and the number of multi-unit legs can be processed according to the calculation results, so that the stator processing and winding methods can be realized.

[0129] Before changing to two types of insulating plates, a total of 2×Z insulating plates need to be assembled on the stator. After the improvement, the present disclosure requires a total of 2×m×2p insulating plates to be assembled. If Z / (m*2p)>2, that is, the number of slots per pole and per phase of the motor is>2, then the number of assembled insulating plates will inevitably decrease.

[0130] In some embodiments,

[0131] There is an overlapping portion between the interphase insulating plate 2 and its adjacent multi-unit insulating plate 3 in the axial direction. The interphase insulating plate 2 is provided with a first step structure on the surface of the overlapping portion facing the multi-unit insulating plate 3, and the multi-unit insulating plate 3 is provided with a second step structure on the surface of the overlapping portion facing the interphase insulating plate 2. The first step structure and the second step structure can form a snap-fit ​​fit to form a circumferential limit between the interphase insulating plate 2 and the multi-unit insulating plate 3.

[0132] The present disclosure also provides an axial overlap between the interphase insulating plate and the adjacent multi-unit insulating plate, and the interphase insulating plate is provided with a first step structure on the surface of the overlapping portion facing the multi-unit insulating plate, and the multi-unit insulating plate is provided with a second step structure on the surface of the overlapping portion facing the interphase insulating plate. The first step structure and the second step structure can form a snap-fit ​​fit to form a circumferential limit between the interphase insulating plate and the multi-unit insulating plate, so that the edge portion between the two insulating plates forms an upper and lower layer staggered structure, and each layer has a certain gap in the circumferential direction to prevent mutual interference caused by tolerance accumulation, and at the same time avoid axial insulation leakage affecting the insulation performance, thereby solving the problem in the related art that after multiple insulating plates are spliced ​​along the circumferential direction, the accumulated tolerance will cause the finally assembled several insulating plates to interfere with each other.

[0133] There is an upper and lower layer matching structure between the interphase insulating plate 2 and the multi-unit insulating plate 3 disclosed in the present invention, the first plane 2-3-1 of the interphase insulating plate 2 is on the side close to the interphase leg 2-2, and the third plane 3-3-1 of the multi-unit insulating plate 3 is on the side away from the multi-unit leg 3-2; during assembly, the interphase insulating plate 2 is first assembled to the stator core 1, the first plane 2-3-1 is attached to the third plane 3-3-1, and then the multi-unit insulating plate 3 is assembled between the two interphase insulating plates 2; after the assembly is completed, the first connecting surface 2-3-3 is opposite to the circumferential end of the second sector 3-11 and a small circumferential gap is left, and the second connecting surface 3-3-3 is opposite to the circumferential end of the first sector 2-11 and a small circumferential gap is left, which can prevent the accumulation of circumferential tolerances from causing mutual interference between the insulating plates; at the same time, the upper and lower layer structure also prevents the formation of axial leaks between the insulating plates that directly reach the surface of the core, further strengthening the insulation protection of the end face coil.

[0134] In some embodiments,

[0135] When the interphase insulation plate 2 includes an interphase plate 2-1, an interphase insulation member 2-4 and an interphase leg 2-2, and the interphase plate 2-1 includes a first fan-shaped portion 2-11 and a first strip portion 2-12: the first step structure is arranged on a side end surface of the first fan-shaped portion 2-11 of the interphase insulation plate 2 facing the interphase insulation member 2-4 and connected to the circumferential end of the first fan-shaped portion 2-11, the first step structure includes a first plane 2-3-1 relatively close to the circumferential end of the first fan-shaped portion 2-11, and a second plane 2-3-2 relatively close to the interphase insulation member 2-4, and a first connecting surface 2-3-3 connected between the first plane 2-3-1 and the second plane 2-3-2, and there is a height difference between the first plane 2-3-1 and the second plane 2-3-2, and a step is formed at the first connecting surface 2-3-3;

[0136] When the multi-unit insulating plate 3 includes a multi-unit plate 3-1 and a multi-unit leg 3-2, and the multi-unit plate 3-1 includes a second fan-shaped portion 3-11 and a second strip portion 3-12: the second step structure is arranged on a side end surface of the second fan-shaped portion 3-11 of the multi-unit insulating plate 3 facing the multi-unit leg 3-2 and connected to the circumferential end of the second fan-shaped portion 3-11, the second step structure includes a third plane 3-3-1 relatively close to the circumferential end of the second fan-shaped portion 3-11, and a fourth plane 3-3-2 relatively close to the multi-unit leg 3-2, and a second connecting surface 3-3-3 connected between the third plane 3-3-1 and the fourth plane 3-3-2, and there is a height difference between the third plane 3-3-1 and the fourth plane 3-3-2, and a step is formed at the second connecting surface 3-3-3;

[0137] The third plane 3-3-1 is in contact with the first plane 2-3-1, the first connecting surface 2-3-3 is opposite to the circumferential end of the second fan-shaped portion 3-11, and the second connecting surface 3-3-3 is opposite to the circumferential end of the first fan-shaped portion 2-11.

[0138] This is the preferred structural form of the first step structure and the second step structure disclosed in the present invention, which effectively enables the first step structure and the second step structure to form a snap-fit ​​fit, so as to form a circumferential limit between the interphase insulating plate and the multi-unit insulating plate, so that the edge parts between the two insulating plates form an upper and lower layer staggered structure, and each layer has a certain gap in the circumferential direction to prevent mutual interference caused by tolerance accumulation, and at the same time avoid axial insulation leakage that affects the insulation performance, and solve the problem in the related art that after multiple insulating plates are spliced ​​along the circumferential direction, the accumulated tolerance will cause the finally assembled several insulating plates to interfere with each other.

[0139] The present disclosure also provides a motor comprising the aforementioned back-wound stator assembly.

[0140] The improvements of the present disclosure are as follows: 1. An insulating plate assembly slot is reserved on the stator to prevent the insulating plate legs from occupying the space in the slot and at the same time allow the legs to have higher structural strength;

[0141] 2. Insulation panels are divided into two categories, which reduces the overall number and makes assembly easier;

[0142] 3. The junction edge of the insulation board is changed to an upper and lower staggered structure to prevent tolerance accumulation from affecting assembly. At the same time, no insulation gap is left in the axial direction to ensure the insulation performance between the winding and the iron core.

[0143] The above description is merely a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present disclosure shall be included within the scope of protection of the present disclosure. The above description is merely a preferred embodiment of the present disclosure. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present disclosure, and such improvements and variations shall also be considered within the scope of protection of the present disclosure.

Claims

1. A back-wound stator, comprising: A yoke (1-1), stator outer teeth (1-2), stator inner teeth (1-3), stator outer slots (1-4) and stator inner slots (1-5), wherein the yoke (1-1) is annular in structure, the stator outer teeth (1-2) are connected to the radial outer periphery of the yoke (1-1) and extend radially outward, the stator inner teeth (1-3) are connected to the radial inner periphery of the yoke (1-1) and extend radially inward, the stator outer teeth (1-2) are multiple, and the multiple stator outer teeth (1-2) are arranged in sequence at intervals in the circumferential direction, the stator outer slots (1-4) are formed between two adjacent stator outer teeth (1-2), the stator inner teeth (1-3) are multiple, and the multiple stator inner teeth (1-3) are arranged in sequence at intervals in the circumferential direction, The stator inner slot (1-5) is formed between two adjacent stator inner teeth (1-3), the stator outer teeth (1-2) and the stator inner teeth (1-3) are opposite to each other in a radial direction, the stator outer slot (1-4) and the stator inner slot (1-5) are also opposite to each other in a radial direction, and a first assembly slot (1-6) is formed by a recess at the junction of the outer periphery of the yoke (1-1) and the stator outer slot (1-4), and a second assembly slot (1-7) is formed by a recess at the junction of the inner periphery of the yoke (1-1) and the stator inner slot (1-5), the first assembly slot (1-6) can be plugged and matched with one of the legs of the insulating part, and the second assembly slot (1-7) can be plugged and matched with one of the legs of the insulating part.

2. The back-wound stator according to claim 1, wherein: The first assembly groove (1-6) is a groove formed by being recessed from the outer circumferential surface of the circular ring of the yoke (1-1) toward the radial inner side, and the first assembly groove (1-6) is connected to the stator outer groove (1-4). The second assembly groove (1-7) is a groove formed by being recessed from the inner circumferential surface of the circular ring of the yoke (1-1) toward the radial outer side, and the second assembly groove (1-7) is connected to the stator inner groove (1-5).

3. The back-wound stator according to claim 2, wherein: There are at least two first assembly grooves (1-6), one of which is located at one circumferential end of the stator outer slot (1-4) and connected to the stator outer teeth (1-2) at one circumferential end, and one of which is located at the other circumferential end of the stator outer slot (1-4) and connected to the stator outer teeth (1-2) at the other circumferential end; There are at least two second assembly grooves (1-7), one of which is located at one circumferential end of the stator inner slot (1-5) and connected to the stator inner teeth (1-3) at one circumferential end, and one of which is located at the other circumferential end of the stator inner slot (1-5) and connected to the stator inner teeth (1-3) at the other circumferential end.

4. The back-wound stator according to claim 3, wherein: The stator outer teeth (1-2) and the stator inner teeth (1-3) form a group of stator teeth, the stator outer slots (1-4) and the stator inner slots (1-5) form a group of stator slots, and the two first assembly slots (1-6) and the two second assembly slots (1-7) form a group of assembly slots. The stator teeth are multiple, and the multiple stator teeth are arranged at intervals along the circumferential direction of the yoke (1-1). The stator teeth are also multiple, and the multiple stator slots are also arranged at intervals along the circumferential direction of the yoke (1-1). The number of stator slots is equal to that of the stator teeth. The assembly slots are also multiple, and the number of the assembly slots is equal to that of the stator slots and are arranged in a one-to-one correspondence with the stator slots.

5. A back-wound stator assembly, comprising the back-wound stator according to any one of claims 1 to 4, and further comprising an insulating part and a winding, the insulating part comprising legs, one of which is plug-fitted with the first assembly groove (1-6), and one of which is plug-fitted with the second assembly groove (1-7), and the winding is wound between the stator inner slot (1-5) and the stator outer slot (1-4) via the surface of the insulating part.

6. The back-wound stator assembly according to claim 5, wherein: When there are at least two first assembly grooves (1-6), one of the first assembly grooves (1-6) is located at one circumferential end of the stator outer slot (1-4) and is connected to the stator outer teeth (1-2) at one circumferential end, and one of the first assembly grooves (1-6) is located at the other circumferential end of the stator outer slot (1-4) and is connected to the stator outer teeth (1-2) at the other circumferential end; When there are at least two second assembly grooves (1-7), one of the second assembly grooves (1-7) is located at one circumferential end of the stator inner groove (1-5) and is connected to the stator inner teeth (1-3) at one circumferential end, and one of the second assembly grooves (1-7) is located at the other circumferential end of the stator inner groove (1-5) and is connected to the stator inner teeth (1-3) at the other circumferential end: The insulating part has at least four legs, one of which is plugged into a first assembly groove (1-6) located at one circumferential end of the stator outer slot (1-4) and connected to the stator outer teeth (1-2), one of which is plugged into a first assembly groove (1-6) located at the other circumferential end of the stator outer slot (1-4) and connected to the stator outer teeth (1-2), one of which is plugged into a second assembly groove (1-7) located at one circumferential end of the stator inner slot (1-5) and connected to the stator inner teeth (1-3), and one of which is plugged into a second assembly groove (1-7) located at the other circumferential end of the stator inner slot (1-5) and connected to the stator inner teeth (1-3).

7. The back-wound stator assembly according to claim 5, wherein: The insulating portion comprises an interphase insulating plate (2) and a multi-connected insulating plate (3), wherein the interphase insulating plate (2) and the multi-connected insulating plate (3) are alternately arranged in a circumferential direction, wherein the interphase insulating plate (2) is arranged on the first assembly slot (1-6) and the second assembly slot (1-7) through its insulating legs to insulate windings between different phases, and wherein one multi-connected insulating plate (3) is arranged in the region of stator teeth and stator slots of the same phase, wherein the multi-connected insulating plate (3) has a plurality of insulating legs, and wherein the plurality of insulating legs are respectively correspondingly plugged into the first assembly slot (1-6) and the second assembly slot (1-7) in the region of the same phase to insulate between the iron core and the winding in the region of the same phase.

8. The back-wound stator assembly of claim 7, wherein: In the interphase region, the number of the plurality of insulating legs of the interphase insulating plate (2) is equal to the total number of the first assembly grooves (1-6) and the second assembly grooves (1-7) in the region, and the plurality of insulating legs of the interphase insulating plate are respectively opposite to the first assembly grooves (1-6) and the second assembly grooves (1-7) one by one and form a plug-in fit; In the region of stator teeth and stator slots of the same phase, the number of the multiple insulating legs of the multi-connected insulating plate (3) is equal to the total number of the first assembly slots (1-6) and the second assembly slots (1-7) in the region, and the multiple insulating legs of the multi-connected insulating plate are respectively opposite to the first assembly slots (1-6) and the second assembly slots (1-7) one by one and form a plug-in fit.

9. The back-wound stator assembly according to claim 7 or 8, wherein: The interphase insulating plate (2) comprises an interphase plate (2-1), an interphase insulating member (2-4) and an interphase leg (2-2), the interphase insulating member (2-4) is arranged on one side plate surface of the interphase plate (2-1), the interphase leg (2-2) is arranged on the other side plate surface of the interphase plate (2-1), the interphase leg (2-2) is respectively plugged into and matched with the first assembly groove (1-6) and the second assembly groove (1-7) to be fixed on the back-wound stator, and the interphase insulating member (2-4) protrudes in a direction away from the interphase plate (2-1) to insulate windings of different phases.

10. The back-wound stator assembly of claim 9, wherein: The interphase plate (2-1) comprises a first sector-shaped portion (2-11) and a first strip-shaped portion (2-12); the first sector-shaped portion (2-11) is connected to a position between two ends of the first strip-shaped portion (2-12); the first sector-shaped portion (2-11) is opposite to the yoke portion (1-1) and can be fitted and connected to each other; the integral part of the stator inner teeth (1-3) and the stator outer teeth (1-2) is opposite to the first strip-shaped portion (2-12) and can be fitted and connected to each other; the interphase legs (2-2) are all arranged on the first sector-shaped portion (2-11).

11. The back-wound stator assembly of claim 9, wherein: There are four interphase legs (2-2), two of which are located radially outside and plug-fit with first assembly grooves (1-6) on both sides of the stator external teeth (1-2) in the circumferential direction, that is, one of the interphase legs (2-2) located radially outside and plug-fit with the first assembly groove (1-6) located on one side of the interphase stator external teeth (1-2) in the circumferential direction, and the other interphase leg (2-2) located radially outside and plug-fit with the first assembly groove (1-6) on the other side of the stator external teeth (1-2) in the circumferential direction, and the two interphase legs (2-2) located radially inside and outside are plug-fitted with each other. The legs (2-2) are plugged into and matched with the second assembly grooves (1-7) on both sides of the stator inner teeth (1-3) in the circumferential direction, that is, one of the interphase legs (2-2) located radially inside is plugged into and matched with the second assembly groove (1-7) located on one side of the interphase stator inner teeth (1-3) in the circumferential direction, and the other interphase leg (2-2) located radially inside is plugged into and matched with the second assembly groove (1-7) on the other side of the stator inner teeth (1-3) in the circumferential direction; the interphase insulating member (2-4) is axially opposite to the stator outer teeth (1-2) and the stator inner teeth (1-3), respectively.

12. The back-wound stator assembly according to any one of claims 7 to 11, wherein: The multi-joint insulating plate (3) comprises a multi-joint plate (3-1) and a multi-joint leg (3-2), wherein the multi-joint leg (3-2) is arranged on a side plate surface of the multi-joint plate (3-1) and protrudes toward the stator. The multi-joint legs (3-2) are respectively plugged into and matched with the first assembly groove (1-6) and the second assembly groove (1-7) to be fixed on the back-wound stator.

13. The back-wound stator assembly of claim 12, wherein: The multi-joint plate (3-1) comprises a second fan-shaped portion (3-11) and a second strip-shaped portion (3-12); the second fan-shaped portion (3-11) is connected to a position between two ends of the second strip-shaped portion (3-12); there are at least two second strip-shaped portions (3-12), and at least two second strip-shaped portions (3-12) are spaced apart along the circumferential direction; the second fan-shaped portion (3-11) is respectively connected between two ends of each second strip-shaped portion (3-12) so as to connect more than two second strip-shaped portions (3-12) into one; the second fan-shaped portion (3-11) is opposite to the yoke portion (1-1) and can be fitted and connected to each other; the integral part of the stator inner teeth (1-3) and the stator outer teeth (1-2) is opposite to the second strip-shaped portion (3-12) and can be fitted and connected to each other; and the multi-joint legs (3-2) are all arranged on the second fan-shaped portion (3-11).

14. The back-wound stator assembly of claim 12, wherein: There are 12 multi-joint legs (3-2), two of which are located radially outside and are plugged into the first assembly grooves (1-6) on both sides of the circumference of the first stator outer tooth (1-2), two of which are located radially outside and are plugged into the first assembly grooves (1-6) on both sides of the circumference of the second stator outer tooth (1-2), and two of which are located radially outside and are plugged into the first assembly grooves (1-6) on both sides of the circumference of the third stator outer tooth (1-2). -6) plug-in fit, wherein two multi-joint legs (3-2) located radially inside are plug-in fit with second assembly grooves (1-7) on both sides of the circumference of the first stator inner tooth (1-3), wherein two multi-joint legs (3-2) located radially inside are plug-in fit with second assembly grooves (1-7) on both sides of the circumference of the second stator inner tooth (1-3), wherein two multi-joint legs (3-2) located radially inside are plug-in fit with second assembly grooves (1-7) on both sides of the circumference of the second stator inner tooth (1-3), wherein two multi-joint legs (3-2) located radially inside are plug-in fit with second assembly grooves (1-7) on both sides of the circumference of the third stator inner tooth (1-3).

15. The back-wound stator assembly of claim 12, wherein: The number of slots N of the multi-connected insulating plate (3) is Z / (m*2p)-1, wherein the number of slots N is the number of stator slots covered, Z is the number of stator slots, wherein one stator outer slot plus one stator inner slot is one stator slot, m is the number of stator phases, and p is the number of pole pairs; the multi-connected insulating plate (3) has 4×N multi-connected legs (3-2).

16. The back-wound stator assembly of claim 7, wherein: The interphase insulating plate (2) and its adjacent multi-unit insulating plate (3) have an overlapping portion in the axial direction, and the interphase insulating plate (2) is provided with a first step structure on the surface of the overlapping portion and facing the multi-unit insulating plate (3), and the multi-unit insulating plate (3) is provided with a second step structure on the surface of the overlapping portion and facing the interphase insulating plate (2), and the first step structure and the second step structure can form a snap-fit ​​fit to form a circumferential limit between the interphase insulating plate (2) and the multi-unit insulating plate (3).

17. The back-wound stator assembly of claim 16, wherein: When the interphase insulating plate (2) comprises an interphase plate (2-1), an interphase insulating member (2-4) and an interphase leg (2-2), and the interphase plate (2-1) comprises a first fan-shaped portion (2-11) and a first strip-shaped portion (2-12): the first step structure is arranged at a position where a side end surface of the first fan-shaped portion (2-11) of the interphase insulating plate (2) faces the interphase insulating member (2-4) and is connected to a circumferential end of the first fan-shaped portion (2-11), and the first step structure The invention comprises a first plane (2-3-1) relatively close to the circumferential end of the first sector portion (2-11), a second plane (2-3-2) relatively close to the interphase insulating member (2-4), and a first connecting surface (2-3-3) connected between the first plane (2-3-1) and the second plane (2-3-2), wherein the first plane (2-3-1) and the second plane (2-3-2) have a height difference and a step is formed at the first connecting surface (2-3-3); When the multi-unit insulating plate (3) comprises a multi-unit plate (3-1) and a multi-unit supporting leg (3-2), and the multi-unit plate (3-1) comprises a second fan-shaped portion (3-11) and a second strip-shaped portion (3-12): the second step structure is arranged at a position on a side end surface of the second fan-shaped portion (3-11) of the multi-unit insulating plate (3) facing the multi-unit supporting leg (3-2) and connected to a circumferential end of the second fan-shaped portion (3-11), and the second step structure comprises a portion relatively close to a third plane (3-3-1) at the circumferential end of the second sector-shaped portion (3-11), a fourth plane (3-3-2) relatively close to the multi-jointed legs (3-2), and a second connecting surface (3-3-3) connected between the third plane (3-3-1) and the fourth plane (3-3-2), wherein there is a height difference between the third plane (3-3-1) and the fourth plane (3-3-2) to form a step at the second connecting surface (3-3-3); The third plane (3-3-1) is in contact with the first plane (2-3-1), and the first connecting The contact surface (2-3-3) is opposite to the circumferential end of the second sector-shaped portion (3-11), and the second connecting surface (3-3-3) is opposite to the circumferential end of the first sector-shaped portion (2-11).

18. An electric machine comprising the back-wound stator assembly according to any one of claims 5 to 17.

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