Winding method of motor winding, stator and motor

Abstract

The invention provides a winding method of a motor winding, a stator and a motor, and the winding method comprises the steps: employing an even-layer winding double-branch design, enabling a first branch to be wound from a first layer to a last layer according to a polar distance, carrying out the flat-layer winding once, enabling the last layer to be reversely wound back to the first layer, and carrying out the repeated winding, when the second branch is wound to the wire outlet end of the first branch, the first branch completes winding, correspondingly, the second branch is wound to the first layer from the last layer according to the polar distance, flat layer winding is carried out again, then the second branch is wound to the last layer from the first layer, winding is repeated back and forth, when the second branch is wound to the wire outlet end of the second branch, winding of the second branch is completed, and in the winding process, the second branch is wound to the wire outlet end of the second branch. And for a single branch, the hairpin pitch wound on the two sides of the wire outlet end and the wire inlet end of the winding in a flat layer manner is a value obtained by adding one to the polar distance, so that the winding branches are symmetrical, and the efficiency of the motor is improved. The chained winding is simple in structural design, simple in process and suitable for batch production, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of motor manufacturing, and in particular to a method for winding a motor winding, a stator and a motor. Background Art

[0002] With the application of flat wire stator technology, electric vehicle motors are gradually adopting flat wire windings. The current flat wire hairpin winding scheme generally uses an odd number of layers, that is, the number of layers of the winding in the stator slot is an odd number. However, in the odd-layer flat wire hairpin winding scheme, in order to balance the potential of each branch in the winding, the odd-layer winding uses more wire types and the arrangement is complex, which makes manufacturing and assembly more difficult, which is not conducive to mass production and cost optimization. Summary of the invention

[0003] The purpose of the present application is to provide a method for winding a motor winding, a stator and a motor, aiming to solve the problem in the related art that the manufacturing and assembly of the flat wire hairpin motor are difficult, which is not conducive to mass production and cost optimization.

[0004] In a first aspect, the present application provides a method for winding a motor winding, wherein the motor winding is wound in a stator; the stator comprises a stator core; the stator core comprises multiple core slot layers; the number of core slot layers of the stator core is an even number; the method comprises: step one: winding a first branch from a first layer to a last layer according to a pole pitch and a target number of layers of the core slot layers, and then performing a flat layer winding; the target number of layers is one; step two: winding the first branch from the last layer to the first layer in reverse according to the pole pitch and the target number of layers; step three: repeating steps one and two until the winding is completed when the first branch is wound to the outlet end. Winding of the first branch; wherein the hairpin pitch of the first branch wound in a flat layer on both sides of the winding outlet and inlet ends is the value obtained by adding one to the pole pitch; step four: according to the pole pitch and the target number of layers, wind the second branch from the last layer to the first layer, and then perform flat winding; step five: according to the pole pitch and the target number of layers, reversely wind the second branch from the last layer to the first layer; step six: repeat steps four and five until the winding of the second branch is completed when it is wound to the outlet end of the second branch; wherein the hairpin pitch of the second branch wound in a flat layer on both sides of the winding outlet and inlet ends is the value obtained by adding one to the pole pitch.

[0005] In the above implementation process, a winding method for a motor winding is provided, which adopts an even-numbered-layer winding double-branch design, and the first branch is wound from the first layer to the last layer according to the pole pitch, and then the flat layer winding is performed again, and then the reverse string is returned from the last layer to the first layer, and the winding is repeated back and forth. When the winding reaches the outlet of the first branch, the first branch is completed. Correspondingly, the second branch is wound from the last layer to the first layer according to the pole pitch, and then the flat layer winding is performed again, and then the winding is repeated from the first layer to the last layer, and the winding is repeated back and forth. When the winding reaches the outlet of the second branch, the second branch is completed. During the winding process, for a single branch, the hairpin pitch of the flat layer winding on both sides of the winding outlet and inlet ends is the value obtained by adding one to the pole pitch, so as to ensure the symmetry of the winding branches and improve the efficiency of the motor. The winding structure design of this chain winding is simple, the process is simple, the manufacturing cost is reduced, and it is suitable for mass production.

[0006] Furthermore, in some examples, the positions of the hairpins wound in parallel on both sides of the winding outlet and inlet of the second branch relative to the outlet and inlet are symmetrical to the hairpins wound in parallel on both sides of the winding outlet and inlet of the first branch.

[0007] Furthermore, in some examples, the number of core slot layers of the stator core is 6; the number of slots of the core slot layer is 54; the pole pitch is 9; the incoming line end of the first branch is slot No. 1 of the first layer, and the outgoing line end is slot No. 12 of the sixth layer.

[0008] Furthermore, in some examples, the incoming end of the second branch is slot No. 39 on the sixth layer, and the outgoing end is slot No. 28 on the first layer.

[0009] Further, in some examples, the first branch is wound from the first layer to the last layer according to the pole pitch and the target number of layers of the core slot layer, and then a flat layer winding is performed, including: the winding of the first branch starts from slot No. 1 of the first layer, and is welded to the hairpin passing through slot No. 10 of the second layer and slot No. 19 of the third layer, and then welded to the hairpin passing through slot No. 28 of the fourth layer and slot No. 37 of the fifth layer, and then welded to the hairpin passing through slot No. 46 of the sixth layer and slot No. 1 of the sixth layer.

[0010] Further, in some examples, the first branch is reversely wound from the last layer to the first layer according to the pole pitch and the target number of layers, including: starting the winding of the first branch from the sixth layer, welding to a hairpin passing through slot 46 of the fifth layer and slot 37 of the fourth layer, and then welding to a hairpin passing through slot 28 of the third layer and slot 19 of the second layer, and then welding to a hairpin passing through slot 10 of the first layer and slot 19 of the first layer.

[0011] In a second aspect, the present application provides a stator, comprising a stator core and a motor winding; the stator core comprises a plurality of core slot layers; the number of core slot layers of the stator core is an even number; the motor winding comprises a multi-phase winding, and each phase winding in the multi-phase winding is wound based on the winding method described in the first aspect.

[0012] In a third aspect, the present application provides a motor, comprising the stator as described in the second aspect.

[0013] Other features and advantages disclosed in the present application will be described in the following description, or some features and advantages can be inferred or determined without doubt from the description, or can be learned by implementing the above-mentioned technology disclosed in the present application.

[0014] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A flow chart of a method for winding a motor winding provided in an embodiment of the present application;

[0017] Figure 2 A schematic diagram of a winding method for a single-phase first branch provided in an embodiment of the present application;

[0018] Figure 3 A schematic diagram of an "I"-shaped hairpin used at the head and tail positions of a winding provided in an embodiment of the present application;

[0019] Figure 4 A schematic diagram of a winding method for a single-phase second branch provided in an embodiment of the present application;

[0020] Figure 5 A schematic diagram of a flat-layer wound hairpin provided in an embodiment of the present application;

[0021] Figure 6 A schematic diagram of a hairpin with a winding provided in an embodiment of the present application wound in a flat layer on both sides of the inlet and outlet ends, i.e., a hairpin with a pitch of y+1;

[0022] Figure 7 A schematic diagram of an overall winding provided in an embodiment of the present application. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0024] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0025] As described in the background technology, the flat wire hairpin winding solutions in the related art generally use odd-numbered winding layers, which have multiple wire types and complex arrangement methods, resulting in high manufacturing and assembly difficulties, which is not conducive to mass production and cost optimization. Based on this, the embodiment of the present application provides a winding solution for motor windings to solve the above problems.

[0026] First, some professional terms involved in the embodiments of this application are introduced:

[0027] Hairpin: refers to the copper flat wire that makes up the motor winding. Since the wire shape in the flat wire winding is mostly similar to the shape of a hairpin, the flat wire in the stator winding is generally called a hairpin;

[0028] Pole pitch: The distance between the centers of two adjacent magnetic poles in the motor core.

[0029] Next, the embodiments of the present application are introduced:

[0030] like Figure 1 As shown, Figure 1 The present invention is a flow chart of a method for winding a motor winding provided by an embodiment of the present invention. The method can be applied to a motor winding device, such as a motor stator automatic winding machine, etc. The motor winding is wound in a stator; the stator includes a stator core; the stator core includes multiple core slot layers; the number of core slot layers of the stator core is an even number.

[0031] The method comprises:

[0032] Step 1: According to the pole pitch of the core slot layer and the target number of layers, the first branch is wound from the incoming line end of the first layer to the last layer, and then a flat layer winding is performed; the target number of layers is one;

[0033] Step 2: Winding the first branch from the last layer to the first layer in reverse according to the pole pitch and the target number of layers;

[0034] Step 3: Repeat steps 1 and 2 until the winding reaches the outlet end of the last layer, and the winding of the first branch is completed; wherein the hairpin pitch of the first branch wound in a flat layer on both sides of the outlet and inlet ends of the winding is the value obtained by adding one to the pole pitch;

[0035] Step 4: According to the pole pitch and the target number of layers, the second branch is wound from the incoming line end of the last layer to the first layer, and then a flat layer winding is performed;

[0036] Step 5: Winding the second branch from the last layer to the first layer in reverse according to the pole pitch and the target number of layers;

[0037] Step six: Repeat steps four and five until the winding reaches the output terminal of the first layer, and the winding of the second branch is completed; wherein the pitch of the hairpins wound in a flat layer on both sides of the output and input terminals of the winding of the second branch is the value obtained by adding one to the pole pitch, and the position of the hairpins relative to the output and input terminals is symmetrical with the hairpins wound in a flat layer on both sides of the output and input terminals of the winding of the first branch.

[0038] This embodiment adopts an even-layer winding design, and the motor winding may include a multi-phase winding, and each phase winding includes two branches, namely the first branch and the second branch. In this embodiment, the first branch is wound according to the pole pitch y, and the incoming line end of the first branch is in the first layer. Starting from the first layer, each hairpin pitch is y, and the number of cross-layers is 1, and it is wound to the Nth layer, where N is the number of layers of the core slot layer, which is an even number, and then a flat layer winding is performed, and then it is reversely wound from the Nth layer to the first layer, and each hairpin pitch is y, and the number of cross-layers is 1. In this way, it is wound back and forth. When it is wound to the outgoing line end of the first branch, the winding of the first branch is completed. In this process, for the symmetry of the winding and the current, the hairpin pitch of the flat layer winding on both sides of the incoming and outgoing line ends of the winding is y+1. This winding does not require multiple bus bars and busbars to connect the branches and center points of each phase winding, avoids the increase in the height of the winding end, does not require the use of a large number of special-shaped coils, reduces the manufacturing difficulty, is conducive to mass production, can ensure the symmetry of the winding branches, reduce the additional losses of the motor, avoid local overheating of the motor, and avoid the degradation of motor performance.

[0039] In some embodiments, the number of core slot layers of the stator core is 6; the number of slots of the core slot layer is 54; the pole pitch is 9; the input end of the first branch is slot No. 1 of the first layer, and the output end is slot No. 12 of the sixth layer. In other words, this winding method is applicable to a stator with 54 core slot layers and 6 layers and a pole pitch of 9. When implemented, the starting slot position of the first branch is slot No. 1 of the first layer and ends at slot No. 12 of the sixth layer. If the first branch continues to be wound after winding to slot No. 12 of the sixth layer, the number of hairpins wound in the second branch will be reduced, the two branches cannot achieve symmetry, and parameters such as resistance, inductance, and current will also change. Therefore, by reasonably setting the input and output end positions of the first branch, the symmetry of the two branches of the single-phase winding can be ensured, thereby reducing the imbalance between the branches and improving the efficiency of the motor.

[0040] Further, in some embodiments, the aforementioned step 1 may include: welding the winding of the first branch from slot 1 of the first layer to the hairpin passing slot 10 of the second layer and slot 19 of the third layer, then welding to the hairpin passing slot 28 of the fourth layer and slot 37 of the fifth layer, and then welding to the hairpin passing slot 46 of the sixth layer and slot 1 of the sixth layer. That is, one end of the hairpin located in slot 1 of the first layer is welded to hairpins N10,2 to N19,3, where hairpins N10,2 to N19,3 indicate that the hairpin passes slot 10 of the second core slot layer and slot 19 of the third layer, and then hairpins N10,2 to N19,3 are connected to the next hairpins N28,4 to N37,5 by welding, and hairpins N28,4 to N37,5 are welded to hairpins N46,6 to N1,6 wound in the flat layer. In this way, the forward winding of the copper flat wire winding from the first layer to the last layer is realized.

[0041] Accordingly, in some embodiments, the aforementioned step 2 may include: welding the winding of the first branch from the sixth layer to the hairpin passing through slot 46 of the fifth layer and slot 37 of the fourth layer, then welding to the hairpin passing through slot 28 of the third layer and slot 19 of the second layer, and then welding to the hairpin passing through slot 10 of the first layer and slot 19 of the first layer. That is, after the copper flat wire winding is wound to the sixth layer for the first time, the string is returned to the first layer, specifically, first welded to hairpins N46,5 to N37,4, then welded to hairpins N28,3 to N19,2, and then welded to hairpins N10,1 to N19,1 wound in the flat layer. In this way, the reverse winding of the copper flat wire winding from the last layer to the first layer is achieved.

[0042] The winding method of the second branch corresponds to that of the first branch. The second branch is wound according to the pole pitch y. The inlet of the second branch is on the Nth layer. Starting from the Nth layer, each hairpin pitch is y, and the number of layers is 1. It is wound to the first layer, and then a flat layer winding is performed. After that, it is wound from the first layer to the Nth layer. Each hairpin pitch is y, and the number of layers is 1. This is done back and forth. When it is wound to the outlet of the second branch, the winding of the second branch is completed. In this process, for the symmetry of the winding and the current, the hairpin pitch of the flat layer winding on both sides of the outlet and inlet of the winding is y+1. The symmetrical current distribution design of the dual branches can effectively disperse the heat, thereby improving the temperature rise control of the motor and improving the reliability of the motor.

[0043] In some embodiments, the positions of the hairpins wound in parallel on both sides of the winding outlet and inlet are symmetrical with the positions of the hairpins wound in parallel on both sides of the winding outlet and inlet. That is, the positions of the y+1 pitch hairpins of the second branch relative to the outlet and inlet are symmetrical with the y+1 pitch hairpins of the first branch, which effectively improves the symmetry of the winding and the current.

[0044] In addition, optionally, when the number of core slot layers of the stator core is 6 layers and the number of slots in the core slot layer is 54 slots, the input end of the second branch can be slot No. 39 of the sixth layer, and the output end can be slot No. 28 of the first layer. In this way, the symmetrical distribution of branch currents can be effectively achieved, thereby reducing the losses in the windings. Of course, in other embodiments, the positions of the input and output ends of the first branch and the input and output ends of the second branch can also be set differently according to different motor types or other scene requirements.

[0045] The embodiment of the present application provides a method for winding a motor winding, adopting an even-numbered-layer winding double-branch design, winding the first branch from the first layer to the last layer according to the pole pitch, and then performing a flat-layer winding, and then reversely stringing the wires from the last layer back to the first layer, and repeating the winding back and forth, when winding to the outlet end of the first branch, the first branch is completed. Correspondingly, the second branch is wound from the last layer to the first layer according to the pole pitch, and then performing a flat-layer winding, and then winding from the first layer to the last layer, and repeating the winding back and forth, when winding to the outlet end of the second branch, the second branch is completed. During the winding process, for a single branch, the hairpin pitch of the flat-layer winding on both sides of the winding outlet and inlet ends is the value obtained by adding one to the pole pitch, thus ensuring the symmetry of the winding branches and improving the efficiency of the motor. The winding structure design of this chain winding is simple, the process is simple, the manufacturing cost is reduced, and it is suitable for mass production.

[0046] In order to explain the solution of this application in more detail, a specific embodiment is introduced below:

[0047] This embodiment provides a winding scheme for a motor winding. In this scheme, the motor includes a multi-phase winding, each phase winding includes two branches, the total number of core slot layers is an even number, the number of core slot layers is 6, the number of slots is 54, and the pole pitch is 9.

[0048] In this scheme, the winding method of the single-phase first branch is as follows Figure 2 As shown, Ni,j represents the slot number i of the jth layer, j∈[1,2,…,6], i∈[1,2,…,54], the starting slot position of the first branch is slot number 1 and ends at slot number 12. The winding method comprises the following steps:

[0049] S201, use at the beginning and end positions Figure 3 The "I" type hairpin shown; the traditional hairpin is shaped like a "U", while the "I" type hairpin is a hairpin shaped like an "I";

[0050] S202, the copper flat wire winding is connected to the hairpins N10,2 to N19,3 by twist welding at N1,1, then connected to the hairpins N28,4 to N37,5 by twist welding, and then connected to the flat-wound hairpins N46,6 to N1,6 by twist welding;

[0051] S203, reversely stringing from the sixth layer back to the first layer, specifically, connecting to hairpins N46,5-N37,4 by twist welding, then connecting to hairpins N28,3-N19,2 by twist welding, and then connecting to hairpins N10,1-N19,1 wound in a flat layer by twist welding;

[0052] S204, winding from the first layer to the sixth layer, connecting to hairpins N28,2 to N37,3 by twist welding, then connecting to hairpins N46,4 to N1,5 by twist welding, and then connecting to flat-layer winding hairpins N10,6 to N20,6 with a pitch of 10 by twist welding;

[0053] S205, stringing wires from the sixth layer back to the first layer, specifically, connecting to hairpins N11,5 to N2,4 by twist welding, then connecting to hairpins N47,3 to N38,2 by twist welding, and then connecting to hairpins N29,1 to N38,1 wound in a flat layer by twist welding;

[0054] S206, winding from the first layer to the sixth layer, connecting to the hairpins N47,2 to N2,3 by twist welding, then connecting to the hairpins N11,4 to N20,5 by twist welding, and then connecting to the hairpins N29,6 to N38,6 wound in the flat layer by twist welding;

[0055] S207, stringing wires from the sixth layer back to the first layer, specifically, connecting to hairpins N29,5-N20,4 by twist welding, then connecting to hairpins N11,3-N2,2 by twist welding, and connecting to flat-layer winding hairpins N47,1-N3,1 with a pitch of 10 by twist welding;

[0056] S208, winding from the first layer to the sixth layer, connecting to the hairpins N12,2 to N21,3 by twist welding, then connecting to the hairpins N30,4 to N39,5 by twist welding, and then connecting to the hairpins N48,6 to N3,6 wound in the flat layer by twist welding;

[0057] S209, stringing wires from the sixth layer back to the first layer, specifically, connecting to hairpins N48,5-N39,4 by twist welding, then connecting to hairpins N30,3-N21,2 by twist welding, and then connecting to hairpins N12,1-N21,1 wound in a flat layer by twist welding;

[0058] S210, wind from the first layer to the sixth layer, connect to the hairpins N30,2~N39,3 by twist welding, then connect to the hairpins N48,4~N3,5 by twist welding, and then connect to the "I" type hairpin N12,6 output line by twist welding.

[0059] The winding method of the single-phase second branch is as follows: Figure 4 As shown, the starting slot of the second branch is slot 39 and ends at slot 28; the winding method includes the following steps:

[0060] S401, use "I" type hairpins at the first and last positions;

[0061] S402, the copper flat wire winding is connected to the hairpins N30,5 to N21,4 by twist welding at N39,6, then connected to the hairpins N12,3 to N3,2 by twist welding, and then connected to the flat-wound hairpins N48,1 to N39,1 by twist welding;

[0062] S403, reverse the line from the first layer back to the sixth layer, connect to the hairpins N48,2~N3,3 by twist welding, then connect to the hairpins N12,4~N21,5 by twist welding, and then connect to the hairpins N30,6~N21,6 wound on the flat layer by twist welding;

[0063] S404, winding from the sixth layer to the first layer, connecting to hairpins N12,5 to N3,4 by twist welding, then connecting to hairpins N48,3 to N39,2 by twist welding, and then connecting to flat-layer winding hairpins N30,1 to N20,1 with a pitch of 10 by twist welding;

[0064] S405, stringing wires from the first layer back to the sixth layer, specifically, connecting to hairpins N29,2 to N38,3 by twist welding, then connecting to hairpins N47,4 to N2,5 by twist welding, and then connecting to hairpins N11,6 to N2,6 wound in a flat layer by twist welding;

[0065] S406, winding from the sixth layer to the first layer, connecting to hairpins N47,5 to N38,4 by twist welding, then connecting to hairpins N29,3 to N20,2 by twist welding, and then connecting to hairpins N11,1 to N2,1 wound in a flat layer by twist welding;

[0066] S407, stringing wires from the first layer back to the sixth layer, specifically, connecting to hairpins N11,2 to N20,3 by twist welding, then connecting to hairpins N29,4 to N38,5 by twist welding, and connecting to flat-layer winding hairpins N47,6 to N37,6 with a pitch of 10 by twist welding;

[0067] S408, winding from the sixth layer to the first layer, connecting to hairpins N28,5 to N19,4 by twist welding, then connecting to hairpins N10,3 to N1,2 by twist welding, and then connecting to hairpins N46,1 to N37,1 wound in a flat layer by twist welding;

[0068] S409, stringing wires from the first layer back to the sixth layer, specifically, connecting to hairpins N46,2 to N1,3 by twist welding, then connecting to hairpins N10,4 to N19,5 by twist welding, and then connecting to hairpins N28,6 to N19,6 wound in a flat layer by twist welding;

[0069] S410, wind from the sixth layer to the first layer, connect to the hairpins N10,5~N1,4 by twist welding, then connect to the hairpins N46,3~N37,2 by twist welding, and then connect to the "I" type hairpin N28,1 outlet by twist welding.

[0070] In the above winding method, the pitch of each hairpin is y. For the symmetry of winding and current, the pitch of the hairpin wound in parallel on both sides of the inlet and outlet is y+1. Figure 5 As shown, the hairpin of y+1 pitch is as follows Figure 6 As shown. Combining the above winding method, we can get Figure 7 The overall winding shown, based on the above method, can be wound in two branches according to different high-power requirements, which reduces the manufacturing difficulty and is conducive to mass production.

[0071] The scheme of this embodiment has at least the following advantages: the design of the even-numbered winding layer realizes the symmetrical distribution of branch current, thereby reducing the circulating current and additional loss, and reducing the loss within the winding; the even-numbered winding layer reduces the imbalance between branches, can improve the efficiency of the motor, and exhibits a higher power conversion rate under rated load; second, the symmetrical current distribution of the double branches of the even-numbered winding layer reduces the risk of local overheating of the motor, can effectively disperse heat, improve the temperature rise control of the motor, improve the reliability of the motor, and extend the service life of the motor and winding, which is particularly suitable for the field of new energy vehicles that are sensitive to temperature; third, the symmetry of the even-numbered winding structure helps to reduce the vibration and noise of the motor. The symmetrical winding arrangement can reduce the unbalanced magnetic field, thereby reducing the mechanical vibration and noise caused by it. During operation, the motor with an even-numbered winding layer can exhibit lower vibration and noise levels, which improves the quietness of the motor and is particularly suitable for occasions with high requirements for low noise, such as household appliances and electric vehicles; Fourth, the chain-wound winding structure is simple in design, with regular linear shapes, and the number of linear shapes and jumpers is greatly reduced, which is conducive to the use of automated production processes. The even-numbered winding layer is easy to operate, has a regular arrangement, low manufacturing cost, a unified winding design, and a simple process. It has more advantages in quality control and can maintain the production consistency of the motor, which is suitable for mass production and promotion and application; Fifth, the symmetry and uniformity of the even-numbered winding layer can improve the motor's carrying capacity, especially when the motor is overloaded for a short time, the current distribution of the even-numbered winding layer is uniform, which can improve the motor's overload capacity and ability to cope with transient currents to a certain extent.

[0072] The present application also provides a stator, comprising a stator core and a motor winding; the stator core comprises a plurality of core slot layers; the number of core slot layers of the stator core is an even number; the motor winding comprises a multi-phase winding, and each phase winding in the multi-phase winding is wound based on the winding method described in the previous embodiment.

[0073] The present application also provides a motor, comprising the above-mentioned stator.

[0074] The above description is only an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0075] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0076] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A method for winding a motor winding, characterized in that: The motor winding is wound in the stator; The stator comprises a stator core; the stator core comprises a plurality of core slot layers; the number of core slot layers of the stator core is an even number; the method comprises: Step 1: Wind the first branch from the first layer to the last layer according to the pole pitch of the core slot layer and the target number of layers, and then perform a flat layer winding; the target number of layers is one; Step 2: Winding the first branch from the last layer to the first layer in reverse according to the pole pitch and the target number of layers; Step 3: Repeat steps 1 and 2 until the winding reaches the outlet end of the first branch, and the winding of the first branch is completed; wherein the hairpin pitch of the first branch wound in a flat layer on both sides of the outlet and inlet ends of the winding is the value obtained by adding one to the pole pitch; Step 4: Winding the second branch from the last layer to the first layer according to the pole pitch and the target number of layers, and then performing flat layer winding; Step 5: Winding the second branch from the last layer to the first layer in reverse according to the pole pitch and the target number of layers; Step six: Repeat steps four and five until the winding reaches the outlet end of the second branch, completing the winding of the second branch; wherein the hairpin pitch of the second branch wound in a flat layer on both sides of the outlet and inlet ends of the winding is the value obtained by adding one to the pole pitch.

2. The method according to claim 1, characterized in that The positions of the hairpins wound in parallel on both sides of the winding outlet and inlet ends of the second branch relative to the outlet and inlet ends are symmetrical to the hairpins wound in parallel on both sides of the winding outlet and inlet ends of the first branch.

3. The method according to claim 2, characterized in that The number of core slot layers of the stator core is 6; the number of slots of the core slot layer is 54; the pole pitch is 9; the incoming end of the first branch is slot No. 1 of the first layer, and the outgoing end is slot No. 12 of the sixth layer.

4. The method according to claim 3, characterized in that The incoming line end of the second branch is slot No. 39 on the sixth layer, and the outgoing line end is slot No. 28 on the first layer.

5. The method according to claim 3, characterized in that: According to the pole pitch and target number of layers of the core slot layer, the first branch is wound from the first layer to the last layer, and then a flat layer winding is performed, including: Start the winding of the first branch from slot No. 1 of the first layer, weld to the hairpin passing through slot No. 10 of the second layer and slot No. 19 of the third layer, then weld to the hairpin passing through slot No. 28 of the fourth layer and slot No. 37 of the fifth layer, and then weld to the hairpin passing through slot No. 46 of the sixth layer and slot No. 1 of the sixth layer.

6. The method according to claim 5, characterized in that The step of reversely winding the first branch from the last layer to the first layer according to the pole pitch and the target number of layers comprises: The winding of the first branch is welded from the sixth layer to the hairpin passing through slot No. 46 of the fifth layer and slot No. 37 of the fourth layer, then welded to the hairpin passing through slot No. 28 of the third layer and slot No. 19 of the second layer, and then welded to the hairpin passing through slot No. 10 of the first layer and slot No. 19 of the first layer.

7. A stator, characterized in that: It comprises a stator core and a motor winding; the stator core comprises multiple core slot layers; the number of core slot layers of the stator core is an even number; the motor winding comprises a multi-phase winding, and each phase winding in the multi-phase winding is wound based on the winding method as claimed in claim 1.

8. A motor, characterized in that: Comprising the stator as claimed in claim 7.

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