Stator, motor, compressor and stator assembling method

Abstract

The invention provides a stator, a motor, a compressor and an assembling method of the stator. The stator comprises a stator iron core, a framework and a stator winding. The stator iron core is formed by splicing a plurality of first iron core blocks and a plurality of second iron core blocks along the circumferential direction of the stator iron core in a manner that the first iron core blocks and the second iron core blocks are alternately arranged; the first iron core block comprises a first tooth part and a containing groove formed in the outer side of the first tooth part, and the second iron core block comprises a second tooth part; the framework sleeves the first tooth part and is positioned in the accommodating groove; the stator winding is wound on the framework; the width of the first tooth part is larger than that of the second tooth part, necessary space is provided for accommodating the framework and the stator winding, and a structure that the first tooth part winds the stator winding and the second tooth part does not wind the stator winding alternately is formed; the stator winding can be wound on the framework firstly, and then the framework is arranged on the first tooth part in a sleeving mode. The complex coil inserting process of a traditional integral stator iron core is abandoned, and only simple winding equipment is needed for winding the stator winding.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, and particularly relates to a stator, motor, compressor, and stator assembly method. Background Technology

[0002] In existing integral stator cores, the winding of stator windings relies on conventional production lines, which involve numerous processes and high technological requirements. Due to equipment limitations, there is a contradiction between pursuing high slot fill factor and motor reliability: a low slot fill factor leads to decreased motor efficiency, while a high slot fill factor increases the risk of insulation damage to the stator windings during the winding process, thus affecting motor reliability. In addition, due to process constraints (such as slot structure and embedded process requirements), the circumference of the stator windings often needs to be compromised in the design, resulting in a larger circumference of the stator windings, which in turn increases the amount of copper used, cost, and resistance, thus increasing copper losses. Summary of the Invention

[0003] In view of this, the present invention provides a stator, motor, compressor and stator assembly method to solve the problems of low slot fill factor and large stator winding circumference in existing integral stator cores, which lead to increased copper consumption, increased copper loss, and increased manufacturing cost and process difficulty.

[0004] This invention provides a stator, comprising a stator core, a frame, and stator windings; The stator core includes a plurality of first core blocks and a plurality of second core blocks; along the circumference of the stator core, the plurality of first core blocks and the plurality of second core blocks are spliced ​​together in an alternating manner of one first core block and one second core block to form the stator core; The first core block includes a first tooth and a receiving groove, and the receiving groove is disposed on the outside of the first tooth along the circumferential direction of the stator core; the second core block includes a second tooth; the width of the second tooth is smaller than the width of the first tooth; The skeleton is fitted onto the first tooth and located within the receiving groove, and the stator winding is wound around the skeleton; Wherein, the width of the first tooth is the width of the first tooth in the circumferential direction of the stator core, and the width of the second tooth is the width of the second tooth in the circumferential direction of the stator core.

[0005] Further optionally, a pole shoe portion is provided on the inner side of the first tooth portion along the radial direction of the stator core; the width of the pole shoe portion is less than or equal to the width of the first tooth portion; The width of the pole shoe portion is the width of the pole shoe portion in the circumferential direction of the stator core.

[0006] Further optionally, along the radial direction of the stator core, a first yoke is provided on the outer side of the first tooth; the first yoke includes a first outer peripheral wall located on the radial outer side of the stator core, the first outer peripheral wall is provided with a first groove, and the extending direction of the first groove is parallel to the axial direction of the stator core; The first groove is provided with a first damping member. Along the radial direction of the stator core, the first damping member protrudes outward from the first outer peripheral wall to abut against the compressor housing. Wherein, along a direction parallel to the axial direction of the stator core, the length of the first groove is equal to the length of the first yoke.

[0007] Alternatively, two first grooves are provided, and the two first grooves are symmetrically arranged with respect to the symmetrical surface of the first iron core block; The plane of symmetry of the first core block passes through the axis of the stator core.

[0008] Further optionally, the first yoke also includes two first inner peripheral walls located radially inside the stator core, the two first inner peripheral walls being disposed opposite each other in the circumferential direction of the stator core; The first tooth includes two tooth sidewalls disposed opposite each other in the circumferential direction of the stator core; The two first inner peripheral walls and the two toothed side walls are arranged one-to-one and respectively form the two receiving grooves.

[0009] Optionally, the first outer peripheral wall is provided with M first countersunk hole groups, the M first countersunk hole groups are spaced apart in a direction parallel to the axial direction of the stator core; each first countersunk hole group includes N first countersunk holes spaced apart in the circumferential direction of the stator core, and the N first countersunk holes are symmetrically arranged with respect to the symmetrical plane of the first core block; the first countersunk holes are used for the connection between the first core block and the compressor housing. The cross-section of the first countersunk hole is rectangular; Wherein, M and N are both even numbers, and M×N≥4.

[0010] Further optionally, along the radial direction of the stator core, a second yoke is provided on the outer side of the second tooth, and the second yoke and the first yoke are spliced ​​together; the second yoke includes a second outer peripheral wall located on the radial outer side of the stator core, the second outer peripheral wall is provided with a second groove, and the extension direction of the second groove is parallel to the axial direction of the stator core; The second groove is provided with a second damping member. Along the radial direction of the stator core, the second damping member protrudes outward from the second outer peripheral wall to abut against the compressor housing. In a direction parallel to the axial direction of the stator core, the length of the second groove is less than the length of the second yoke.

[0011] Alternatively, two second grooves are provided, and the two second grooves are symmetrically arranged with respect to the symmetrical face of the second iron core block; The plane of symmetry of the second core block is perpendicular to the axis of the stator core.

[0012] Further optionally, the second outer peripheral wall is provided with X second countersunk holes, the X second countersunk holes are spaced apart along a direction parallel to the axial direction of the stator core, and each second countersunk hole is symmetrically arranged with respect to the symmetrical plane of the second core block; the second countersunk holes are used for connecting the second core block and the compressor housing; The cross-section of the second countersunk hole is rectangular; Wherein, X is an even number and X≥2.

[0013] Further optionally, the frame includes a first toothed sleeve and a winding slot; the first toothed sleeve is fitted onto the first tooth, and the winding slot surrounds the outside of the first toothed sleeve for accommodating the stator winding.

[0014] Further optionally, a first yoke is provided on the outer side of the first tooth along the radial direction of the stator core; the first yoke includes two first inner peripheral walls located on the radial inner side of the stator core, the two first inner peripheral walls being disposed opposite to each other in the circumferential direction of the stator core; Along the radial direction of the stator core, the outer side of the first gear sleeve is provided with two outer partitions and two inner partitions; along the circumferential direction of the stator core, the two outer partitions are arranged opposite to each other on both sides of the first gear sleeve, and the two outer partitions and the two first inner peripheral walls are arranged in a one-to-one correspondence; along the circumferential direction of the stator core, the two inner partitions are arranged opposite to each other on both sides of the first gear sleeve, and the two inner partitions and the two outer partitions are arranged in a one-to-one correspondence, and the winding slot is formed between the inner partitions and the outer partitions; Both the outer and inner partitions are made of insulating materials.

[0015] Further optionally, the stator further includes a second toothed sleeve, which is sleeved on the second tooth portion; The second toothed sleeve is made of insulating material.

[0016] Further optionally, along the radial direction of the stator core, a snap-fit ​​protrusion is formed on the inner side of the second tooth sleeve, and a snap-fit ​​groove is formed on the second tooth portion; the snap-fit ​​protrusion is embedded in the snap-fit ​​groove, so that the second tooth sleeve is disposed on the second tooth portion.

[0017] The present invention also provides an electric motor, including a rotor and a stator as described in any of the above claims; the stator core is provided with a mounting hole, and the rotor is disposed within the mounting hole.

[0018] The present invention also provides a compressor, including a housing and the motor described above; the housing has an internal mounting cavity, and the motor is disposed within the mounting cavity; The housing is provided with a first through hole and a second through hole, the first through hole and the first countersunk hole are provided correspondingly, and the second through hole and the second countersunk hole are provided correspondingly; Both the first through hole and the second through hole include a lateral extension section and a longitudinal extension section, wherein the length of the lateral extension section is greater than the length of the longitudinal extension section; The lateral extensions of the first through hole and the second through hole are both used for welding the stator and the housing. The longitudinal extension of the first through hole is used to connect with the first countersunk hole by screws. The longitudinal extension of the second through hole is used to connect with the second countersunk hole by screws. The extension direction of the transverse extension section (731) is perpendicular to the extension direction of the longitudinal extension section (732), and the extension direction of the longitudinal extension section (732) is parallel to the axial direction of the stator core.

[0019] The present invention also provides a method for assembling the stator of a compressor, wherein the compressor is the compressor described above; the assembly method includes a pre-assembly step of the stator, the pre-assembly step including: A skeleton is fitted onto the first tooth of each first iron core block, and a stator winding is wound around each skeleton; or, the stator winding is wound around the skeleton first, and then the skeleton is fitted onto the first tooth of the first iron core block. Multiple first iron core blocks, each fitted with a skeleton and wound with stator windings, and multiple second iron core blocks are spliced ​​together in an alternating manner of one first iron core block and one second iron core block to form a ring-shaped stator.

[0020] Further optionally, the assembly method further includes a stator and housing installation step; the installation step includes: The pre-assembled stator is placed inside the mounting cavity of the housing; The first through hole and the first countersunk hole, as well as the second through hole and the second countersunk hole, are connected by screws. Detect the air gap between the stator and rotor; Adjust the screws according to the detected air gap between the stator and rotor at each position so that the air gap between the stator and rotor at each position is within the preset range; The stator and housing are connected by welding.

[0021] Compared with the prior art, the main advantages of the present invention are as follows: (1) The design of the first tooth being wider than the second tooth provides space for the skeleton and a sufficient number of stator windings, forming an alternating structure of "stator windings wound on the first tooth" and "stator windings not wound on the second tooth"; the stator windings can be wound on the skeleton first, and then the skeleton can be fitted on the first tooth; the complex winding process of the traditional integral stator core is eliminated, and only simple winding equipment is needed to wind the stator windings; the production process and equipment are greatly simplified, and the production efficiency is significantly improved; (2) The winding method is free from the slot space limitation required by the traditional winding process. The selection of stator winding is no longer restricted by the slot size. Both round wire and flat wire can be used. It makes full use of the advantages of flat wire winding in improving slot fill factor and motor power density, and solves the process bottleneck that the existing integral stator core needs to be concentrated to wind the stator winding, which makes it difficult to achieve flat wire winding. The selection range of stator winding wire diameter is also wider, providing greater freedom for the optimization design of motor performance. (3) The stator winding coils are tightly wound turn by turn, without the need to increase redundant length to accommodate the winding process, thus achieving the theoretical minimum circumference of the stator winding; without slot obstruction, the wires can be arranged tightly and orderly, maximizing the space utilization of the slots; while ensuring extremely high reliability, the copper consumption is minimized and the slot fill factor is maximized, thereby significantly reducing the copper loss and material cost of the motor and improving the efficiency and power density of the motor. Attached Figure Description

[0022] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0023] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0024] Figure 1 A schematic diagram of an embodiment of the present invention showing that multiple first iron core blocks (with a frame and stator windings) are arranged along the circumference of the stator iron core; Figure 2 A schematic diagram of the assembly structure of the first core block, frame, and stator winding embodiment provided by the present invention; Figure 3a This is an exploded structural diagram of the first embodiment of the iron core block and skeleton provided by the present invention; Figure 3b A schematic diagram of the assembly structure of the first iron core block and skeleton embodiment provided by the present invention; Figure 4 This is a schematic diagram of the structure of the first outer peripheral wall of the first iron core block provided by the present invention; Figure 5 A schematic diagram of an embodiment of the present invention in which multiple second core blocks (with second toothed sleeves) are arranged along the circumference of the stator core; Figure 6a This is an exploded structural diagram of an embodiment of the second iron core block and the second toothed sleeve provided by the present invention; Figure 6b This is a schematic diagram of the assembly structure of the second iron core block and the second toothed sleeve provided by the present invention; Figure 7 This is a schematic diagram of the structure of the second outer peripheral wall of the second core block provided by the present invention; Figure 8a This is a schematic diagram of the structure of the first vibration damping component embodiment provided by the present invention; Figure 8b This is a schematic diagram of the structure of the second vibration damping component embodiment provided by the present invention; Figure 9a This is a schematic diagram of the structure of the first through hole embodiment on the housing provided by the present invention; Figure 9b This is a schematic diagram of an embodiment of the second through hole on the housing provided by the present invention; Figure 10 A schematic diagram of the screw embodiment provided by the present invention; Figure 11 A schematic diagram of the assembly structure of the stator and compressor housing embodiment provided by the present invention; In the picture: 1-First iron core block; 11-First tooth; 111-Tooth sidewall; 12-Pole shoe; 13-First yoke; 131-First outer peripheral wall; 132-First inner peripheral wall; 133-First groove; 134-First countersunk hole; 135-First welding groove; 14-Receiving groove; 2-Second core block; 21-Second tooth; 211-Snap-fit ​​groove; 22-Second yoke; 221-Second outer peripheral wall; 222-Second groove; 223-Second countersunk hole; 224-Second welding groove; 3-Frame; 31-First toothed sleeve; 32-Outer partition; 33-Inner partition; 34-Winding slot; 4-Second toothed sleeve; 41-Snap-fit ​​protrusion; 51 - First vibration damper; 52 - Second vibration damper; 61-Stator winding; 62-Screw; 7-Housing; 71-First through hole; 72-Second through hole; 731-Transverse extension section; 732-Longitudinal extension section; 74-Mounting cavity; 75-Solder joint. Detailed Implementation

[0025] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” used in the embodiments of this invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. “Multiple” generally includes at least two, but does not exclude the inclusion of at least one.

[0027] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0028] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0029] In existing integral stator cores, the winding of stator windings relies on conventional production lines, which involve numerous processes and high technological requirements. Due to equipment limitations, there is a contradiction between pursuing high slot fill factor and motor reliability: a low slot fill factor leads to decreased motor efficiency, while a high slot fill factor easily causes an increase in the stator winding twist rate, thereby reducing motor reliability. In addition, due to process constraints (such as slot structure and embedded process requirements), the circumference of the stator winding often needs to be compromised in the design, resulting in a larger stator winding circumference, which in turn increases the amount of copper used, cost, and resistance, thus increasing copper loss. This invention creatively provides a stator, including a stator core, a frame, and stator windings; the stator core is formed by splicing together multiple first core blocks and multiple second core blocks along the circumference of the stator core in an alternating manner of "one first core block and one second core block"; the first core block includes a first tooth and a receiving groove disposed outside the first tooth, and the second core block includes a second tooth; the frame is sleeved on the first tooth and located in the receiving groove, and the stator windings are wound on the frame; the width of the first tooth is greater than the width of the second tooth, providing the necessary space to accommodate the frame and a sufficient number of stator windings, forming a structure in which the first tooth is wound around the stator windings and the second tooth is not wound around the stator windings alternately; The stator winding can be wound onto the bobbin first, and then the bobbin can be fitted onto the first tooth. This eliminates the complex winding process of traditional integral stator cores, and only simple winding equipment is needed to wind the stator winding. The production process and equipment are greatly simplified, and the production efficiency is significantly improved.

[0030] like Figures 1 to 11 As shown, this embodiment provides a stator, including a stator core, a frame 3, and a stator winding 61; The stator core includes multiple first core blocks 1 and multiple second core blocks 2; along the circumference of the stator core, multiple first core blocks 1 and multiple second core blocks 2 are spliced ​​together in an alternating manner of "one first core block 1 and one second core block 2" to form an annular stator core; The first core block 1 includes a first tooth 11 and at least one receiving groove 14. The receiving groove 14 is disposed on the outside of the first tooth 11 along the circumferential direction of the stator core. The second core block 2 includes a second tooth 21. The width of the first tooth 11 is greater than the width of the second tooth 21. The frame 3 is fitted onto the first tooth 11 and located in the receiving groove 14, and the stator winding 61 is wound around the frame 3; Wherein, the width of the first tooth 11 is the width of the first tooth 11 in the circumferential direction of the stator core, and the width of the second tooth 21 is the width of the second tooth 21 in the circumferential direction of the stator core. The width of the first tooth 11 is greater than that of the second tooth 21, providing necessary space for the frame 3 and the stator winding 61. The frame 3 is fitted onto the first tooth 11, and the stator winding 61 is wound around the frame 3, forming an alternating structure of "the first tooth 11 winding the stator winding" and "the second tooth 21 not winding the stator winding". The stator winding 61 can be wound onto the frame 3 first, and then the frame 3 can be fitted onto the first tooth 11. This simplifies the production process of the stator winding 61, reduces costs, and improves reliability. The stator winding 61 is wound directly one turn at a time, minimizing the coil circumference. At the same time, there is no slot opening or equipment limitation during the winding process of the stator winding 61, allowing for the highest slot fill factor. This minimizes the copper loss and copper usage of the motor, improving motor efficiency while reducing motor costs.

[0031] The stator winding 61 can be produced using only simple winding equipment. After being coated with enamel, the wound stator winding 61 is mounted on the first tooth 11 via the skeleton 3. This greatly simplifies the production process and equipment, significantly reducing production costs. Furthermore, the stator winding offers other advantages: the stator winding 61 can be produced using either round or flat wire, with no impact on wire diameter (existing integral stators require centralized winding, making flat wire winding impossible). Design, processes, and production equipment are no longer limited by wire diameter. Separate winding avoids the situation where the stator winding 61 is embedded in a confined space, minimizing the risk of wire breakage during stator winding, reducing the stator winding failure rate, and improving the long-term reliability of the motor.

[0032] The structure and dimensions of the pole shoe portion 12 will be described below. The pole shoe portion 12 is provided on the inner side of the first tooth portion 11 along the radial direction of the stator core. The width of the pole shoe portion 12 is less than or equal to the width of the first tooth portion 11. The width of the pole shoe portion 12 is the width of the pole shoe portion 12 in the circumferential direction of the stator core.

[0033] The structure of the first yoke 13 will be described below. Along the radial direction of the stator core, the first yoke 13 is provided on the outer side of the first tooth 11. The first yoke 13 includes a first outer peripheral wall 131 located on the radial outer side of the stator core. The first outer peripheral wall 131 is provided with a first groove 133. The extending direction of the first groove 133 is parallel to the axial direction of the stator core. The first groove 133 is provided with a first damping member 51. Along the radial direction of the stator core, the first damping member 51 protrudes outward from the first outer peripheral wall 131 to abut against the compressor housing 7. The first damping member 51 is made of soft material, has a certain elasticity and does not react with the compressor lubricating oil and refrigerant. In the direction parallel to the axial direction of the stator core, the length of the first groove 133 is equal to the length of the first yoke 13.

[0034] Preferably, there are two first grooves 133, and the two first grooves 133 are symmetrically arranged with respect to the symmetrical surface of the first iron core block 1; Among them, the plane of symmetry of the first iron core block 1 passes through the axis of the stator iron core.

[0035] The formation of the receiving groove 14 will be described below. The first yoke 13 also includes two first inner peripheral walls 132 located on the radial inner side of the stator core. The two first inner peripheral walls 132 are arranged opposite to each other in the circumferential direction of the stator core. The first tooth 11 includes two tooth sidewalls 111 arranged opposite each other in the circumferential direction of the stator core; Two first inner peripheral walls 132 and two toothed side walls 111 are arranged in a one-to-one correspondence and respectively form two receiving grooves 14, that is, each first iron core block 1 has two receiving grooves 14.

[0036] The first countersunk hole 134 is described below. The first outer peripheral wall 131 is provided with M first countersunk hole groups, which are spaced apart in a direction parallel to the axial direction of the stator core. Each first countersunk hole group includes N first countersunk holes 134 spaced apart in the circumferential direction of the stator core, and the N first countersunk holes 134 are symmetrically arranged with respect to the symmetrical plane of the first core block 1. The first countersunk hole 134 is used for the connection between the first core block 1 and the compressor housing 7. The first countersunk hole 134 has a rectangular cross-section. The first countersunk hole 134 with a rectangular cross-section is used instead of other countersunk holes such as circles in order to reduce the specifications of the iron core laminations and facilitate high-speed stamping (because the stator iron core is made of multiple laminations stacked along the axial direction. If the cross-section of the first countersunk hole 134 were circular, multiple holes of different sizes would need to be opened, which would result in too many lamination specifications, too long die stroke or too many punches, making it impossible for high-speed punch presses to produce). Where M and N are both even numbers, and M×N≥4, that is, the product of M and N is greater than or equal to 4; preferably, M=2 and N=2.

[0037] The structure of the second yoke 22 will be described below. Along the radial direction of the stator core, the second yoke 22 is provided on the outer side of the second tooth 21. The second yoke 22 and the first yoke 13 are spliced ​​together. The second yoke 22 includes a second outer peripheral wall 221 located on the radial outer side of the stator core. The second outer peripheral wall 221 is provided with a second groove 222. The extension direction of the second groove 222 is parallel to the axial direction of the stator core. The second groove 222 is provided with a second damping member 52. Along the radial direction of the stator core, the second damping member 52 protrudes outward from the second outer peripheral wall 221 to abut against the compressor housing 7. The second damping member 52 is made of soft material, has a certain elasticity and does not react with the compressor lubricating oil and refrigerant. In the direction parallel to the axial direction of the stator core, the length of the second groove 222 is less than the length of the second yoke 22.

[0038] Furthermore, there are two second grooves 222, and the two second grooves 222 are symmetrically arranged with respect to the symmetrical surface of the second iron core block 2; The plane of symmetry of the second core block 2 is perpendicular to the axis of the stator core, that is, the plane of symmetry of the second core block 2 is a plane perpendicular to the axis of the stator core.

[0039] Along the circumference of the stator core, a first welding groove 135 is formed at both ends of the first outer peripheral wall 131; along the circumference of the stator core, a second welding groove 224 is formed at both ends of the second outer peripheral wall 221; after multiple first core blocks 1 and multiple second core blocks 2 are spliced ​​into an annular stator core, the first welding groove 135 of the first core block 1 and the second welding groove 224 of the adjacent second core block are correspondingly set and form a complete groove. Through welding operation in this complete groove, the adjacent first core blocks 1 and second core blocks 2 are fixedly connected, and thus multiple first core blocks 1 and multiple second core blocks 2 constitute an integral stator core; the welding strength is high, which improves the operational reliability of the stator core.

[0040] The following describes the second countersunk hole 223. The second outer peripheral wall 221 is provided with X second countersunk holes 223. The X second countersunk holes 223 are spaced apart along a direction parallel to the axial direction of the stator core, and each second countersunk hole 223 is symmetrically arranged with respect to the symmetrical surface of the second core block 2. The second countersunk hole 223 is used to connect the second core block 2 and the compressor housing 7. The cross-section of the second countersunk hole 223 is rectangular. The second countersunk hole 223 with a rectangular cross-section is used instead of other countersunk holes such as circles in order to reduce the specifications of the iron core laminations and facilitate high-speed stamping (because the stator iron core is made of multiple laminations stacked along the axial direction. If the cross-section of the second countersunk hole 223 were circular, multiple holes of different sizes would need to be opened, which would result in too many lamination specifications, too long die stroke or too many punches, making it impossible for high-speed punch presses to produce). Where X is an even number and X≥2; preferably, X=2.

[0041] The structure of the frame 3 is described below. The frame 3 includes a first toothed sleeve 31 and a winding groove 34. The first toothed sleeve 31 is fitted onto the first tooth 11, and the winding groove 34 surrounds the outside of the first toothed sleeve 31 to accommodate the stator winding 61.

[0042] Furthermore, along the radial direction of the stator core, the outer side of the first gear sleeve 31 is provided with two outer partitions 32 and two inner partitions 33; along the circumferential direction of the stator core, the two outer partitions 32 are arranged opposite to each other on both sides of the first gear sleeve 31, and the two outer partitions 32 and the two first inner peripheral walls 132 are arranged in a one-to-one correspondence; along the circumferential direction of the stator core, the two inner partitions 33 are arranged opposite to each other on both sides of the first gear sleeve 31, and the two inner partitions 33 and the two outer partitions 32 are arranged in a one-to-one correspondence, and a winding slot 34 is formed between the inner partitions 33 and the outer partitions 32; The outer partition 32 and the inner partition 33 are both made of insulating material; the first tooth sleeve 31 isolates the first tooth 11 and the stator winding 61, the outer partition 32 isolates the first yoke 13 and the stator winding 61, and the inner partition 33 isolates the pole shoe 12 and the stator winding 61.

[0043] The following description focuses on the second gear sleeve 4. The stator also includes the second gear sleeve 4, which is sleeved on the second gear part 21. The second toothed sleeve 4 is made of insulating material; the second toothed sleeve 4 isolates the second tooth 21 from the stator winding 61.

[0044] Furthermore, along the radial direction of the stator core, a snap-fit ​​protrusion 41 is formed on the inner side of the second tooth sleeve 4, and a snap-fit ​​groove 211 is formed on the second tooth portion 21; the snap-fit ​​protrusion 41 is embedded in the snap-fit ​​groove 211, so that the second tooth sleeve 4 is disposed on the second tooth portion 21.

[0045] This embodiment also provides an electric motor, including a rotor and a stator as described in any of the above embodiments; the stator core is surrounded by mounting holes, and the rotor is disposed within the mounting holes.

[0046] This embodiment also provides a compressor, including a housing 7 and the motor described above; the housing 7 has an internal mounting cavity 74, and the motor is disposed in the mounting cavity 74; The housing 7 is provided with a first through hole 71 and a second through hole 72. The first through hole 71 and the first countersunk hole 134 are correspondingly provided, and the second through hole 72 and the second countersunk hole 223 are correspondingly provided. Both the first through hole 71 and the second through hole 72 include a lateral extension 731 and a longitudinal extension 732, wherein the length of the lateral extension 731 is greater than the length of the longitudinal extension 732. The lateral extension 731 of the first through hole 71 and the lateral extension 731 of the second through hole 72 are both used for welding connection between the stator and the housing 7. The longitudinal extension 732 of the first through hole 71 is used to connect with the first countersunk hole 134 by screw 62. The longitudinal extension 732 of the second through hole 72 is used to connect with the second countersunk hole 223 by screw 62. The screw 62 is a self-tapping screw. The extension direction of the lateral extension 731 is perpendicular to the extension direction of the longitudinal extension 732, and the extension direction of the longitudinal extension 732 is parallel to the axial direction of the stator core. Reduce iron loss in the motor after compressor assembly to improve compressor energy efficiency; Preferably, both the first through hole 71 and the second through hole 72 are approximately cross-shaped through holes. The positions of the first through hole 71 and the first countersunk hole 134 correspond, and the positions of the second through hole 72 and the second countersunk hole 223 correspond. The length of the first countersunk hole 134 in the axial direction parallel to the stator core is less than the length of the longitudinal extension 732 of the first through hole 71. The first countersunk hole 134 and the first through hole 71 are pre-tightened by screws 62, while the transverse extension 731 of the first through hole 71 is used for welding. Its length is greater than the width of the head of the screw 62 so that the stator core can be welded to the housing 7. The weld point 75 finally completely covers the head of the screw 62 to prevent leakage at the screw 62 (there is high pressure inside the compressor during operation). The length of the second countersunk hole 223 in the axial direction parallel to the stator core is less than the length of the longitudinal extension 732 of the second through hole 72. The second countersunk hole 223 and the second through hole 72 are pre-tightened by screws 62. The transverse extension 731 of the second through hole 72 is used for welding. Its length is greater than the width of the screw head 62 so that the stator core can be welded to the housing 7. The weld point 75 finally covers the entire head of the screw 62 to prevent leakage at the screw 62 (there is high pressure inside the compressor when it is running).

[0047] This embodiment also provides a method for assembling the stator of a compressor, wherein the compressor is the compressor described above; the assembly method includes a pre-assembly process for the stator, the pre-assembly process including: A frame 3 is fitted onto the first tooth 11 of each first iron core block 1, and a stator winding 61 is wound around each frame 3; or, the stator winding 61 is wound around the frame 3 first, and then the frame 3 is fitted onto the first tooth 11 of the first iron core block 1. Multiple first iron core blocks 1, each equipped with a frame 3 and a stator winding 61, and multiple second iron core blocks 2 are spliced ​​together in an alternating manner of "one first iron core block 1 and one second iron core block 2" to form a ring-shaped stator.

[0048] Furthermore, the assembly method also includes the installation process of the stator and the housing 7; the installation process includes: The pre-assembled stator is placed in the mounting cavity 74 of the housing 7; The first through hole 71 and the first countersunk hole 134, as well as the second through hole 72 and the second countersunk hole 223, are connected by screws 62. Detection of the air gap between the stator and rotor and testing of the motor back EMF waveform; Based on the detected air gap between the stator and rotor at each position and the tightness of the back EMF waveform adjustment screw 62, the air gap between the stator and rotor at each position is kept within the preset range so that the air gap between the stator and rotor reaches the optimal level. The motor assembly is completed by welding the stator and the housing 7 together; The stator core contacts the compressor housing 7 through a vibration damping component. The vibration damping component is elastic, ensuring that the screw 62 remains attached to the inner circumferential wall of the housing 7 whether it is loosened or tightened. The vibration damping component does not react with the compressor's lubricating oil or refrigerant. The outer diameter of the stator core is smaller than the inner diameter of the housing 7, ensuring that the adjusting screw 62 will not interfere with the housing 7.

[0049] In summary, this invention enables the adjustment of the air gap between the stator and rotor of the motor. After the motor is installed in the compressor, the air gap (the air gap between the stator and rotor) can be adjusted to the optimal value, thereby reducing the uneven distribution of the air gap caused by part processing errors and assembly errors, improving the performance of the motor and the compressor, and also reducing process scrap caused by uneven air gap distribution during assembly, thus reducing costs. Meanwhile, this invention solves the problem of significantly increased iron loss in motors caused by interference fit between the stator and the compressor housing in the existing compressor industry: because the compressor housing 7 has a certain compressive stress in the radial direction on the stator core when the interference fit is used, this compressive stress will change the original arrangement of magnetic domains in the laminations of the stator core, which will eventually lead to a significant increase in stator iron loss and a significant reduction in compressor energy efficiency. In this invention, the outer circle of the stator core is also designed with a protruding vibration damping component, which is made of soft material. The vibration damping component abuts against the inner peripheral wall of the compressor housing 7, and the stator core does not directly contact the housing 7, so that there is a certain vibration damping structure between the motor and the compressor housing 7, thereby reducing the vibration and noise generated by the motor transmitted to the compressor housing 7, and further reducing the overall vibration and noise of the compressor.

[0050] Exemplary embodiments of this disclosure have been specifically shown and described above. It should be understood that this disclosure is not limited to the detailed structures, arrangements, or implementations described herein; rather, this disclosure is intended to cover various modifications and equivalent arrangements contained within the spirit and scope of the appended claims.

Claims

1. A stator, characterized in that, It includes the stator core, frame (3) and stator winding (61); The stator core includes a plurality of first core blocks (1) and a plurality of second core blocks (2); along the circumference of the stator core, the plurality of first core blocks (1) and the plurality of second core blocks (2) are spliced ​​together in an alternating manner of one first core block (1) and one second core block (2) to form the stator core; The first iron core block (1) includes a first tooth (11) and a receiving groove (14). Along the circumference of the stator iron core, the receiving groove (14) is disposed on the outside of the first tooth (11); the second iron core block (2) includes a second tooth (21); the width of the second tooth (21) is smaller than the width of the first tooth (11); The skeleton (3) is sleeved on the first tooth (11) and located in the receiving groove (14), and the stator winding (61) is wound on the skeleton (3); Wherein, the width of the first tooth (11) is the width of the first tooth (11) in the circumferential direction of the stator core, and the width of the second tooth (21) is the width of the second tooth (21) in the circumferential direction of the stator core.

2. The stator according to claim 1, characterized in that, Along the radial direction of the stator core, a pole shoe (12) is provided on the inner side of the first tooth (11); the width of the pole shoe (12) is less than or equal to the width of the first tooth (11); The width of the pole shoe portion (12) is the width of the pole shoe portion (12) in the circumferential direction of the stator core.

3. The stator according to claim 1, characterized in that, Along the radial direction of the stator core, a first yoke (13) is provided on the outer side of the first tooth (11); the first yoke (13) includes a first outer peripheral wall (131) located on the radial outer side of the stator core, the first outer peripheral wall (131) is provided with a first groove (133), and the extension direction of the first groove (133) is parallel to the axial direction of the stator core. The first groove (133) is provided with a first damping member (51). Along the radial direction of the stator core, the first damping member (51) protrudes outward from the first outer peripheral wall (131) to abut against the compressor housing (7). Wherein, along a direction parallel to the axial direction of the stator core, the length of the first groove (133) is equal to the length of the first yoke (13).

4. The stator according to claim 3, characterized in that, There are two first grooves (133), and the two first grooves (133) are symmetrically arranged with respect to the symmetrical surface of the first iron core block (1); The plane of symmetry of the first iron core block (1) passes through the axis of the stator iron core.

5. The stator according to claim 3, characterized in that, The first yoke (13) also includes two first inner peripheral walls (132) located on the radial inner side of the stator core, the two first inner peripheral walls (132) being arranged opposite to each other in the circumferential direction of the stator core; The first tooth (11) includes two tooth sidewalls (111) arranged opposite each other in the circumferential direction of the stator core; The two first inner peripheral walls (132) and the two tooth side walls (111) are respectively arranged to form two receiving grooves (14).

6. The stator according to claim 4, characterized in that, The first outer peripheral wall (131) is provided with M first countersunk hole groups, which are spaced apart along a direction parallel to the axial direction of the stator core; each first countersunk hole group includes N first countersunk holes (134) spaced apart along the circumference of the stator core, and the N first countersunk holes (134) are symmetrically arranged with respect to the symmetrical plane of the first core block (1); the first countersunk holes (134) are used for the connection between the first core block (1) and the compressor housing (7); The first countersunk hole (134) has a rectangular cross-section; Wherein, M and N are both even numbers, and M×N≥4.

7. The stator according to claim 6, characterized in that, Along the radial direction of the stator core, a second yoke (22) is provided on the outer side of the second tooth (21), and the second yoke (22) and the first yoke (13) are spliced ​​together; the second yoke (22) includes a second outer peripheral wall (221) located on the radial outer side of the stator core, and the second outer peripheral wall (221) is provided with a second groove (222), and the extension direction of the second groove (222) is parallel to the axial direction of the stator core; The second groove (222) is provided with a second damping member (52). Along the radial direction of the stator core, the second damping member (52) protrudes outward from the second outer peripheral wall (221) to abut against the compressor housing (7). In the direction parallel to the axial direction of the stator core, the length of the second groove (222) is less than the length of the second yoke (22).

8. The stator according to claim 7, characterized in that, The second groove (222) is provided in two, and the two second grooves (222) are symmetrically arranged with respect to the symmetrical surface of the second iron core block (2); The plane of symmetry of the second core block (2) is perpendicular to the axis of the stator core.

9. The stator according to claim 7, characterized in that, The second outer peripheral wall (221) is provided with X second countersunk holes (223), the X second countersunk holes (223) are spaced apart along a direction parallel to the axial direction of the stator core, and each second countersunk hole (223) is symmetrically arranged with respect to the symmetrical surface of the second core block (2); the second countersunk holes (223) are used to connect the second core block (2) and the housing (7) of the compressor; The cross-section of the second countersunk hole (223) is rectangular; Wherein, X is an even number and X≥2.

10. The stator according to claim 1, characterized in that, The frame (3) includes a first toothed sleeve (31) and a winding groove (34); the first toothed sleeve (31) is fitted on the first tooth (11), and the winding groove (34) surrounds the outside of the first toothed sleeve (31) for accommodating the stator winding (61).

11. The stator according to claim 10, characterized in that, Along the radial direction of the stator core, a first yoke (13) is provided on the outer side of the first tooth (11); the first yoke (13) includes two first inner peripheral walls (132) located on the radial inner side of the stator core, and the two first inner peripheral walls (132) are arranged opposite to each other in the circumferential direction of the stator core. Along the radial direction of the stator core, the outer side of the first gear sleeve (31) is provided with two outer partitions (32) and two inner partitions (33); along the circumferential direction of the stator core, the two outer partitions (32) are arranged opposite to each other on both sides of the first gear sleeve (31), and the two outer partitions (32) and the two first inner peripheral walls (132) are arranged in a one-to-one correspondence; along the circumferential direction of the stator core, the two inner partitions (33) are arranged opposite to each other on both sides of the first gear sleeve (31), and the two inner partitions (33) and the two outer partitions (32) are arranged in a one-to-one correspondence, and the winding slot (34) is formed between the inner partitions (33) and the outer partitions (32); Both the outer partition (32) and the inner partition (33) are made of insulating material.

12. The stator according to claim 1, characterized in that, It also includes a second toothed sleeve (4), which is fitted onto the second toothed portion (21); The second toothed sleeve (4) is made of insulating material.

13. The stator according to claim 12, characterized in that, Along the radial direction of the stator core, a snap-fit ​​protrusion (41) is formed on the inner side of the second tooth sleeve (4), and a snap-fit ​​groove (211) is formed on the second tooth portion (21); the snap-fit ​​protrusion (41) is embedded in the snap-fit ​​groove (211), so that the second tooth sleeve (4) is disposed on the second tooth portion (21).

14. An electric motor, characterized in that, It includes a rotor and a stator as described in any one of claims 1 to 13; the stator core is provided with a mounting hole, and the rotor is disposed within the mounting hole.

15. A compressor, characterized in that, Includes a housing (7) and the motor as described in claim 14; the housing (7) has an internal mounting cavity (74) and the motor is disposed within the mounting cavity (74); The housing (7) is provided with a first through hole (71) and a second through hole (72), the first through hole (71) and the first countersunk hole (134) are provided correspondingly, and the second through hole (72) and the second countersunk hole (223) are provided correspondingly; The first through hole (71) and the second through hole (72) both include a lateral extension section (731) and a longitudinal extension section (732), wherein the length of the lateral extension section (731) is greater than the length of the longitudinal extension section (732); The lateral extension (731) of the first through hole (71) and the lateral extension (731) of the second through hole (72) are both used for welding connection between the stator and the housing (7). The longitudinal extension (732) of the first through hole (71) is used to connect with the first countersunk hole (134) by screws (62). The longitudinal extension (732) of the second through hole (72) is used to connect with the second countersunk hole (223) by screws (62). The extension direction of the transverse extension section (731) is perpendicular to the extension direction of the longitudinal extension section (732), and the extension direction of the longitudinal extension section (732) is parallel to the axial direction of the stator core.

16. A method for assembling the stator of a compressor, characterized in that, The compressor is the compressor according to claim 15; the assembly method includes a stator pre-assembly process, the pre-assembly process including: A skeleton (3) is fitted on the first tooth (11) of each first iron core block (1), and a stator winding (61) is wound on each skeleton (3); or, the stator winding (61) is wound on the skeleton (3) first, and then the skeleton (3) is fitted on the first tooth (11) of the first iron core block (1). Multiple first iron core blocks (1) with skeleton (3) and stator winding (61) and multiple second iron core blocks (2) are spliced ​​together in an alternating manner of one first iron core block (1) and one second iron core block to form a ring stator.

17. The method for assembling the stator of a compressor according to claim 16, characterized in that, The assembly method further includes the installation process of the stator and the housing (7); the installation process includes: The pre-assembled stator is placed in the mounting cavity (74) of the housing (7); The first through hole (71) and the first countersunk hole (134) are connected by screws (62), as are the second through hole (72) and the second countersunk hole (223); Detect the air gap between the stator and rotor; Based on the tightness of the air gap adjustment screw (62) between the stator and rotor at each detected position, the air gap between the stator and rotor at each position is kept within the preset range. The stator and the housing are connected by welding (7).

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