Preparation method of stator winding, stator winding, stator assembly and induction motor

Abstract

The invention relates to a preparation method of a stator winding, the stator winding, a stator assembly and an induction motor. The method comprises the following steps of: flatly winding conductors for winding 6m branch units of three phases in sequence in a wave winding manner; during tiled winding, two effective parts of any wave winding pattern formed by wave winding of any conductor are arranged in an up-and-down staggered layer manner, and the effective parts of the wave winding patterns in different cross-layer manners are arranged in a staggered layer manner; the 6m conductors which are laid and wound are coiled from one ends of the conductors in a circular ring shape, and the 6m conductors are coiled for n / 2 circles to the other ends of the conductors; during coiling, the coiling direction of the 6m conductors is the direction in which the serial number of the conductor slots is increased, and the radial outer side of the 6m conductors is the side where the slot layer with the serial number of 1 of the conductor slots is located. According to the invention, through the specified coiling process, the problem that the inductance unbalance amount of the continuous wave winding stator winding of the induction motor is relatively large due to an improper preparation method can be improved.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to a method for preparing a stator winding, a stator winding, a stator assembly, and an induction motor. Background Technology

[0002] The rotor magnetic field of an induction motor is induced through the stator. It typically includes a stator assembly fixed within the motor housing and a rotatable rotor assembly. The stator assembly usually consists of a stator core and stator windings. The inner side of the stator core may have several conductor slots, and the stator windings may include three phase windings. Each phase winding may include several winding branches, and any winding branch can be wound with flat conductors, making the motor a flat-wire motor. During winding, any winding branch can use a continuous wave winding method, meaning it can use a sufficiently long conductor to continuously wave-wind rather than sequentially welding hairpin coils. For any conductor slot, it can have several slot layers arranged radially, with the conductor occupying one slot layer each time it is wound within the slot. When any winding branch is continuously wave-wound, the slot layers wound into the conductor slot twice consecutively can be two radially adjacent slot layers. Thus, the conductor can fill the slot layer of the conductor slot and be wound to obtain the desired winding structure. However, due to improper manufacturing methods, the stator windings of existing induction motors with continuous wave windings suffer from a large inductance imbalance. Summary of the Invention

[0003] Based on this, this application provides a method for preparing a stator winding, a stator winding, a stator assembly, and an induction motor, in order to improve the problem of large inductance imbalance in the continuous wave winding stator winding of the induction motor in the prior art due to improper preparation method.

[0004] In a first aspect, this application provides a method for preparing a stator winding, wherein the stator winding is used in a stator assembly, the stator assembly has three phases, namely U phase, V phase and W phase, and 2p poles, the stator assembly further includes a stator core, the stator core is arranged circumferentially with Z conductor slots numbered 1 to Z, each conductor slot is arranged radially with n slot layers numbered 1 to n, the continuously wave-wound stator winding includes three phase winding lines, each phase winding line includes 2m branch units, each branch unit is continuously wound with one conductor in a wave-wound manner and each wave-wound formation forms a wave-wound profile, the wave-wound profile includes two effective portions wound in the conductor slots, the wave... The two effective parts of the winding pattern are connected in a layer-by-layer manner: slot layer numbered "1" and slot layer numbered "2", or slot layer numbered "3" and slot layer numbered "4"... or slot layer numbered "n-1" and slot layer numbered "n". Each branch unit enters from slot layer numbered "1" and winds through each pole in the same layer-by-layer manner, winding from the inside out to exit from slot layer numbered "n". The winding lines of the V phase and the W phase are obtained by shifting the winding lines of the U phase by Z / 3p and 2Z / 3p conductor slots respectively along the direction of increasing conductor slot number. Among the entry positions of the 6m branch units of the three phases, the conductor slot with the smallest number is "s". The method for preparing the stator winding includes: The conductors used to wind the 6m branch units of the three phases are laid flat in sequence in a wave-wound manner; during the flat-wound, the two effective parts of any wave-wound line formed by any wave-wound conductor are staggered layer by layer, and the effective parts of the wave-wound line with different cross-layer methods are staggered layer by layer. The 6m conductors, which are laid flat and wound, are coiled from one end into a ring shape. The 6m conductors are coiled n / 2 turns to reach the other end. When coiling, the coiling direction of the 6m conductors is the direction in which the conductor slot number increases, and the radial outer side of the 6m conductors is the side where the slot layer with the slot number "1" is located.

[0005] In one embodiment, the conductors for winding the 6m branch units of the three phases are sequentially wound in a wave-like manner, including: The conductors used to wind 6m branch units of three phases are sequentially laid flat on a wiring device in a wave-wound manner. The wiring device includes a wiring base and a limiting groove disposed on the wiring base. When the conductor grooves are laid flat, they are wound within the limiting grooves, and the limiting grooves are provided with n groove layers. When laid flat, the limiting grooves are divided into at least n / 2 consecutive groups, and each group has Z grooves. The conductor groove with the serial number "s" corresponds to the first group of limiting grooves. When any conductor traverses each pole with the same wave-wound profile in the same cross-layer manner, the conductor grooves wound therecorrespond to a group of limiting grooves. The two effective parts of any wave-wound profile formed by any conductor are staggered and disposed in two of the groove layers of the limiting grooves.

[0006] In one embodiment, the 6m strands of the conductor, laid flat and wound, are coiled into a ring shape starting from one end, and the 6m strands of the conductor are coiled n / 2 turns to reach the other end, including: The 6m conductors, laid flat and wound, are coiled from one end onto a shaping device, which includes a central post and shaping grooves located outside the central post. There are Z shaping grooves, and the effective portion of the conductor is coiled within the shaping grooves, which have n groove layers. The 6m conductors are coiled n / 2 turns to reach the other end.

[0007] In one embodiment, p=4, Z=48, n=8, m=1. Each phase winding circuit includes two parallel winding branches. Each winding branch includes two branch units connected in series. Each winding branch starts from slot "1" and winds to slot "2" four times, then winds from slot "3" to slot "4" four times, and then winds from slot "5" to slot "6" four times. Continue winding four times, starting from slot "7" and winding to slot "8" four times consecutively, then entering the wire from slot "8" and winding to slot "7" four times consecutively, then winding from slot "6" to slot "5" four times consecutively, then winding from slot "4" to slot "3" four times consecutively, and finally winding from slot "2" to slot "1" four times consecutively and exiting the wire.

[0008] In one embodiment, the first winding branch of the U phase is: 3.1-9.2-15.1-21.2-27.1-33.2-39.1-45.2-3.3-9.4-15.3-21.4-27.3-33.4-39.3-45.4-3.5-9.6-15.5-21.6-27.5-33.6-39.5-45.6-3.7-9.8-15.7-21.8-27.7-33.8-39.7-45.8-4. 8-46.7-40.8-34.7-28.8-22.7-16.8-10.7-4.6-46.5-40.6-34.5-28.6-22.5-16.6-10.5-4.4-46.3-40.4-34.3-28.4-22.3-16.4-10.3-4.2-46.1-40.2-34.1-28.2-22.1-16.2-10.1; The second winding branch of the U phase is: 4.1-10.2-16.1-22.2-28.1-34.2-40.1-46.2-4.3-10.4-16.3-22.4-28.3-34.4-40.3-46.4-4.5-10.6-16.5-22.6-28.5-34.6-40.5-46.6-4.7-10.8-16.7-22.8-28.7-34.8-40.7-46. 8-3.8-45.7-39.8-33.7-27.8-21.7-15.8-9.7-3.6-45.5-39.6-33.5-27.6-21.5-15.6-9.5-3.4-45.3-39.4-33.3-27.4-21.3-15.4-9.3-3.2-45.1-39.2-33.1-27.2-21.1-15.2-9.1.

[0009] In one embodiment, p=4, Z=48, n=8, m=2, and the winding circuit of each phase includes 4 parallel winding branches. Each winding branch includes one branch unit. Each winding branch enters from the slot layer numbered "1" and winds to the slot layer numbered "2" and winds continuously four times. It winds from the slot layer numbered "3" to the slot layer numbered "4" and winds continuously four times. It winds from the slot layer numbered "5" to the slot layer numbered "6" and winds continuously four times. It winds from the slot layer numbered "7" to the slot layer numbered "8" and winds continuously four times before exiting.

[0010] In one embodiment, the first winding branch of the U phase is: 3.1-9.2-15.1-21.2-27.1-33.2-39.1-45.2-3.3-9.4-15.3-21.4-27.3-33.4-39.3-45.4-3.5-9.6-15.5-21.6-27.5-33.6-39.5-45.6-3.7-9.8-15.7-21.8-27.7-33.8-39.7-45.8; The second winding branch of the U phase is: 4.1-10.2-16.1-22.2-28.1-34.2-40.1-46.2-4.3-10.4-16.3-22.4-28.3-34.4-40.3-46.4-4.5-10.6-16.5-22.6-28.5-34.6-40.5-46.6-4.7-10.8-16.7-22.8-28.7-34.8-40.7-46.8; The third winding branch of the U phase is: 9.1-15.2-21.1-27.2-33.1-39.2-45.1-3.2-9.3-15.4-21.3-27.4-33.3-39.4-45.3-3.4-9.5-15.6-21.5-27.6-33.5-39.6-45.5-3.6-9.7-15.8-21.7-27.8-33.7-39.8-45.7-3.8; The fourth winding branch of the U phase is: 10.1-16.2-22.1-28.2-34.1-40.2-46.1-4.2-10.3-16.4-22.3-28.4-34.3-40.4-46.3-4.4-10.5-16.6-22.5-28.6-34.5-40.6-46.5-4.6-10.7-16.8-22.7-28.8-34.7-40.8-46.7-4.8.

[0011] Secondly, this application provides a stator winding, which is prepared using any of the stator winding preparation methods provided in this application.

[0012] Thirdly, this application provides a stator assembly, which includes any of the stator windings provided in this application.

[0013] Fourthly, this application provides an induction motor, which includes any of the stator assemblies provided in this application.

[0014] This application describes a method for sequentially laying out the conductors of a 6m branch unit for winding three phases in a wave-like manner. The 6m conductors are then coiled from one end to the other, with the direction of increasing conductor slot number used as the coiling direction. The side containing slot number "1" is designated as the outer radial side of the 6m conductors. This method can reduce the three-phase inductance imbalance to below 1%. In other words, this application, through a specified coiling process, can improve the problem of large inductance imbalance in continuously wave-wound stator windings of induction motors caused by improper manufacturing methods. Attached Figure Description

[0015] Figure 1 The route diagram of the winding line of phase U when the stator winding is connected in parallel with 4 branches, provided in Embodiment 2 of this application; Figure 2 A route diagram of the winding circuit of phase U when the stator winding is connected in parallel with two branches, as provided in Embodiment 2 of this application; Figure 3 This is a schematic diagram of a conductor being laid flat and wound in the method for preparing a stator winding provided in Embodiment 1 of this application. Figure 4 This is a schematic diagram of the process of laying 6m conductors flat and winding them in the method for preparing the stator winding provided in Embodiment 1 of this application. Figure 5 This is a schematic diagram of the process of coiling 6m conductors in the method for preparing the stator winding provided in Embodiment 1 of this application. Figure 6 This is a schematic diagram of the process of laying 6m conductors flat and winding them onto the wiring device in the method for preparing the stator winding provided in Embodiment 1 of this application. Figure 7 This is a longitudinal sectional view of the stator winding preparation method provided in Embodiment 1 of this application, in which 6m conductors are laid flat and wound on the wiring device. Figure 8 This is a top view of the shaping device in the stator winding preparation method provided in Embodiment 1 of this application; Figure 9 This is a schematic diagram of the process of coiling 6m conductors in the method for preparing the stator winding provided in Comparative Example 1 of this application. Figure 10 This is a schematic diagram of the process of coiling 6m conductors in the method for preparing the stator winding provided in Comparative Example 2 of this application. Figure 11 This is a schematic diagram of the process of coiling 6m conductors in the method for preparing the stator winding provided in Comparative Example 3 of this application.

[0016] Reference numerals: 100, conductor; 110, wave type; 111, effective part; 200, wiring device; 210, wiring base; 220, limiting groove; 300, shaping device; 310, central column; 320, shaping groove; 330, shaping tooth. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0018] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention.

[0019] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. 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.

[0020] The orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "middle," "longitudinal," "lateral," "horizontal," "inner," "outer," "radial," and "circumferential" used in this specification are based on the orientations or positional relationships shown in the accompanying drawings and are only for the purpose of simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] As described in the background section, in the fabrication of existing continuously wave-wound stator windings for induction motors, the conductors are first laid flat and wound sequentially in a wave-like manner. During this flat-wound process, the two effective portions of the wave-shaped profile can be staggered. After the conductors are laid flat and wound, they can be coiled from one end and wound multiple turns to form the desired stator winding, which is then assembled to the stator core. However, existing continuously wave-wound stator windings often suffer from significant inductance imbalance due to improper coiling processes in their fabrication methods.

[0022] Example 1 Based on the foregoing reasons, Embodiment 1 of this application provides a method for preparing a stator winding, such as... Figures 1 to 8As shown, the stator winding is used in the stator assembly, which has three phases: U, V, and W, with 2p poles. The stator assembly also includes a stator core. The stator core has Z conductor slots numbered 1 to Z sequentially arranged circumferentially. Each conductor slot has n slot layers numbered 1 to n sequentially arranged radially. The continuous wave-wound stator winding includes three phase winding lines. Each phase winding line includes 2m branch units. Each branch unit uses a single conductor 100, continuously wound in a wave-wound manner, forming a wave-wound profile 110 each time. The wave-wound profile 110 includes two effective portions 111 wound within the conductor slots. The effective part 111 has a cross-layer configuration of slot layer numbered "1" and slot layer numbered "2", or slot layer numbered "3" and slot layer numbered "4"... or slot layer numbered "n-1" and slot layer numbered "n". Each branch unit enters from slot layer numbered "1" and winds through each pole with the same cross-layer configuration of wave-shaped wire 110, winding from the inside out to exit from slot layer numbered "n". The winding lines of phase V and phase W are obtained by shifting phase U winding lines sequentially by Z / 3p and 2Z / 3p conductor slots along the direction of increasing conductor slot number. Among the entry positions of the 6m branch units of the three phases, the conductor slot with the smallest number is "s". The method for preparing stator windings includes the following steps: S1. The conductors 100 used to wind the 6m branch units of the three phases are laid flat in sequence in a wave-wound manner. During the flat-wound, the two effective parts 111 of any wave-wound line 110 formed by any conductor 100 are staggered in the upper and lower layers, and the effective parts 111 of the wave-wound line 110 with different cross-layer methods are staggered in the layers. S2. Starting from one end, the 6m conductors laid flat and wound are coiled into a ring shape. The 6m conductors 100 are coiled n / 2 turns to the other end. When coiling, the coiling direction of the 6m conductors 100 is the direction in which the conductor slot number increases. The radial outer side of the 6m conductors 100 is the side where the slot layer with the conductor slot number "1" is located.

[0023] In this embodiment, it is exemplarily illustrated that the stator assembly can have three phases, and the three phases of the stator assembly can be phase U, phase V, and phase W, respectively. The designations "U", "V", and "W" are only for the convenience of describing the three phases of the stator assembly and are not intended to limit them in any way. In some embodiments, the three phases of the stator assembly may also be represented by other designations.

[0024] like Figure 1 and Figure 2As shown, the stator assembly can have 2p poles and can include a stator core and stator windings. The stator core can be formed by stacking several stator laminations and can be configured as a hollow cylindrical structure. Z conductor slots can be evenly spaced circumferentially on its inner side, and the Z conductor slots can be numbered sequentially from 1 to Z along the circumference of the stator core. Each conductor slot has n slot layers arranged radially. During winding, the conductor 100 is wound within one of the slot layers of the conductor slot. The n slot layers of the conductor slot can be numbered sequentially from 1 to n along the radial direction of the stator core.

[0025] like Figure 1 and Figure 2 As shown, the stator winding can include three phases of winding lines, each phase of which includes 2m branch units. These 2m branch units can be connected in parallel to form 2m parallel winding branches. Alternatively, the 2m branch units can be connected in series in pairs and then in parallel to form m parallel winding branches. Based on this arrangement, stator windings with different numbers of parallel winding branches can be manufactured, and these two types of stator windings can be adapted to high-voltage motors and low-voltage motors, respectively.

[0026] In this embodiment, each branch unit can be continuously wound using a single conductor 100 in a wave-like manner. The conductor 100 can be a flat enameled wire, which may include an outer insulating varnish material and an inner copper material. During continuous wave-winding, each branch unit forms a wave pattern 110. The wave pattern 110 can be understood as a hairpin coil for wave-winding, comprising at least one effective portion 111 wound within one slot layer of the conductor slots. There can be two effective portions 111, and the number of conductor slots crossed between the two effective portions 111 is the pitch of the wave pattern 110. The two effective parts 111 of the wave-wound profile 110 can be wound from the slot layer numbered "1" to the slot layer numbered "2", or from the slot layer numbered "3" to the slot layer numbered "4"... or from the slot layer numbered "n-1" to the slot layer numbered "n"; that is, this embodiment has n / 2 different cross-layer wave-wound profiles 110.

[0027] like Figure 1 and Figure 2As shown, in this embodiment, each branch unit is wound using the slot layer numbered "1". It is easy to see that this embodiment has 6m branch units, and therefore 6m entry points. Among the 6m entry points, the conductor slot with the smallest number can be numbered "s", where "s" can be any one of "1" to "Z". Furthermore, each branch unit can be wound using the same cross-layer wave pattern 110 across all poles. For example, after any branch unit enters the winding, the wave pattern 110, consisting of slot layers numbered "1" and "2", can be used to wind all poles across all poles. Simultaneously, any branch unit is wound sequentially from the inside out until the exit wire of slot layer number "n". That is, any winding branch, in a cross-layer manner, traverses all poles with the wave-shaped wire 110 of slot layer number "1" and slot layer number "2", then, in a cross-layer manner, the wave-shaped wire 110 of slot layer number "3" and slot layer number "4" traverses all poles again... and so on, in a cross-layer manner, the wave-shaped wire 110 of slot layer number "n-1" and slot layer number "n" traverses all poles and exits. It is easy to understand that each time any winding branch traverses all poles, it completes one circumferential turn of the stator core.

[0028] The stator winding can be prepared using the stator winding preparation method provided in this embodiment.

[0029] like Figure 3 and Figure 4 As shown, in the method for preparing the stator winding, in step S1, the conductors 100 used to wind the 6m branch units of the three phases can be laid flat and wound sequentially in a wave-like manner. Specifically, the conductors 100 can be laid flat and wound sequentially according to the serial number of the conductor slot at the entry position of the 6m branch units. For example, the conductors 100 used to wind the branch unit with the conductor slot numbered "s" can be laid flat first, and then the conductors 100 used to wind the branch units with the conductor slots with larger serial numbers can be laid flat in sequence. When the conductors 100 are laid flat and wound, the two effective parts 111 of any wave-like shape 110 formed by any conductor 100 are staggered vertically, and the effective parts 111 of wave-like shapes 110 with different cross-layering methods are staggered to correspond to the cross-layering method of each wave-like shape 110 on the stator core.

[0030] like Figure 5 As shown, in step S2, after the conductors 100 used to wind the 6m branch units of the three phases are laid flat and wound sequentially, they can be coiled from one end into a ring shape. The conductors 100 used to wind the 6m branch units of the three phases can be coiled n / 2 turns circumferentially to the other end. When the coiling of the conductors 100 used to wind the 6m branch units of the three phases is completed, the required winding structure is formed.

[0031] During coiling, the coiling direction of the 6m conductors 110 is in the direction of increasing conductor slot number. At the same time, the radial outer side of the 6m conductors 100 is the side where the slot layer with the conductor slot number "1" is located.

[0032] After the 6m branch unit is coiled, it can be heat-treated to give it a certain degree of flexibility so that it can be radially compressed. After compression, the coiled 6m branch unit can be fed into the stator core, and after being fed in, it can be radially expanded again, so that its effective part is arranged in the conductor slot and assembled on the stator core.

[0033] By comparison, it can be understood that this application lays out the conductors 100 used to wind the 6m branch units of the three phases in a wave-like manner, and coils the 6m conductors 100 from one end to the other end. When coiling, the direction of increasing conductor slot number is taken as the coiling direction, and the side where the slot layer with the conductor slot number "1" is located is taken as the radial outer side of the 6m conductors 100. This can reduce the three-phase inductance imbalance to less than 1%. That is, this application can improve the problem of large inductance imbalance in the stator winding of the continuously wave-wound induction motor due to improper preparation method by using the specified coiling process.

[0034] Specifically, the conductors 100 used to wind the 6m branch units of the three phases are sequentially wound in a wave-like manner (i.e., step S1), including the following steps: S11. Conductors 100 used for winding 6m branch units of three phases are sequentially laid flat on the wiring device 200 in a wave-like manner. The wiring device 200 includes a wiring base 210 and a limiting groove 220 provided on the wiring base 210. When the conductor grooves are laid flat, they are wound in the limiting groove 220, and the limiting groove 220 is provided with n groove layers. When laid flat, the limiting groove 220 is divided into at least n / 2 consecutive groups, and each group has Z grooves. The conductor groove with the serial number "s" corresponds to the first group of limiting grooves 220. When any conductor 100 traverses each pole with the same wave-like winding pattern 110 in the same cross-layer manner, the conductor grooves wound are all corresponding to a group of limiting grooves 220. The two effective parts 111 of any wave-like winding pattern 110 formed by any conductor 100 are staggered and arranged in two groove layers of the limiting groove 220.

[0035] like Figure 6 and Figure 7As shown in this embodiment, by way of example, in step S11, the conductors 100 used to wind the 6m branch units of the three phases can be laid flat on the wiring device 200 in a wave-like manner. The wiring device 200 may include a wiring base 210 and limiting grooves 220 provided on the wiring base 210. The wiring base 210 may be a rectangular plate, and the limiting grooves 220 may be set at equal intervals of X along the length direction of the wiring base 210, where X should not be less than Z×n / 2+2Z / 3p. Each limiting groove 220 may be provided with n groove layers, and when the conductor 100 is laid flat for winding, it may be wound in one of the groove layers of the limiting groove 220.

[0036] like Figure 6 and Figure 7 As shown, in this embodiment, the X limiting slots 220 can be divided into at least n / 2 consecutive groups, with each group consisting of Z slots. The conductor 100 of a branch unit used for winding the conductor slot with the inlet position numbered "s" can be wound within the first group of limiting slots 220; that is, the conductor slot with the inlet position numbered "s" can correspond to the first group of limiting slots 220. Specifically, the conductor slot with the inlet position numbered "s" can correspond to the first limiting slot 220 of the first group at one end of the cable base 210. At this time, the limiting slots 220 on the cable base 210 can be divided into n / 2 consecutive groups, with 2Z / 3p slots remaining at the other end. These 2Z / 3p limiting slots 220 can be used for the flat winding of the winding units of the other two phases besides the phase where the branch unit is located.

[0037] Of course, in some embodiments, the conductor groove numbered "s" can specifically correspond to other limiting grooves 220 in the first group of limiting grooves 220 on the ribbon cable base 210. For example, the conductor groove numbered "s" can specifically correspond to the second, third or fourth limiting groove 220 of the first group at one end of the ribbon cable base 210.

[0038] like Figure 6 and Figure 7 As shown, when any conductor 100 traverses all poles with the same layer-by-layer winding pattern 110, the conductor slots wound can all correspond to a set of limiting slots 220. For example, when any conductor 100 traverses all poles with the layer numbered "1" and "2" of the winding pattern 110 in a layer-by-layer manner, crossing one revolution along the circumference of the stator core, its corresponding Z conductor slots can correspond to the first set of limiting slots 220. Similarly, when any conductor 100 traverses all poles with the layer numbered "3" and "4" of the winding pattern 110 in a layer-by-layer manner, crossing another revolution along the circumference of the stator core, its corresponding Z conductor slots can correspond to the second set of limiting slots 220. The same logic applies to subsequent flat winding methods.

[0039] Simultaneously, the two effective portions 111 of any wave-wound profile 110 formed by any conductor 100 can be staggered and arranged in two slot layers of the limiting groove 220. For example, when any conductor 100 is wave-wound in a cross-layer manner for wave-wound profile 110 in slot layer number "1" and slot layer number "2", if an effective portion 111 of the wave-wound profile 110 wound in slot layer number "1" is arranged in the first slot layer of the limiting groove 220, then the wave-wound profile... An effective portion 111 of type 110 wound in slot layer number "2" is set in the second slot layer of the limiting slot 220, and an effective portion 111 of wave-wound type 110 wound in slot layer number "3" is set in the third slot layer of the limiting slot 220, while an effective portion 111 of wave-wound type 110 wound in slot layer number "4" is set in the fourth slot layer of the limiting slot 220; the subsequent flat winding method can be obtained in the same way.

[0040] It is understood that in this embodiment, by sequentially laying the conductors 100 of the 6m branch units used for winding the three phases flat on the wiring device 200 in a wave-like manner, it is easier to wind the conductors 100 into the required wave shape 110, and it is also easier to lay the 6m conductors 100 flat for winding, thereby facilitating their coiling.

[0041] More specifically, starting from one end, the 6m conductor, which is laid flat and wound, is coiled into a ring shape. The 6m conductor is coiled n / 2 turns to reach the other end (i.e., step S2), including the following steps: S21. The 6m conductors laid flat and wound are coiled from one end onto the shaping device 300, wherein the shaping device 300 includes a central post 310 and shaping grooves 320 disposed outside the central post 310. There are Z shaping grooves 320. The effective part of the conductor is coiled in the shaping grooves 320, and the shaping grooves 320 are provided with n groove layers. The 6m conductors are coiled n / 2 turns to the other end.

[0042] like Figure 6 and Figure 7 As shown in this embodiment, by way of example, after the conductor 100 for winding a 6m branch unit of three phases is laid flat and wound on the wiring device 200, the conductor 100 for winding a 6m branch unit of three phases can be removed from the wiring device 200. During removal, the two effective layers 111 of the conductor 100 for winding a 6m branch unit of three phases wound within the same limiting groove 220 can be pre-fixed to prevent movement or separation between the conductors 100 for winding a 6m branch unit of three phases. The pre-fixing method can be by binding with cable ties, tape, or other components, by hot melt adhesive bonding, or by clamping with locking clips, etc.

[0043] like Figure 8 As shown, in step S21, the 6m conductors 100 laid flat can be coiled from one end onto the shaping device 300. During coiling, the pre-fixation between the conductors 100 can be removed, for example, by cutting the cable ties used to bind the conductors 100. The shaping device 300 may include a central post 310 and shaping slots 320 disposed outside the central post 310. There may be Z shaping slots 320, corresponding one-to-one with the conductor slots of the stator core. The shaping slots 320 may be formed by shaping teeth 330, which can extend and retract radially along the central post 310, either extending to the outside of the central post 310 or retracting into the central post 310. There may be Z shaping teeth 330 evenly spaced circumferentially along the central post 310. When a shaping tooth 330 extends beyond the outside of the central post 310, a shaping slot 320 is formed between two adjacent shaping teeth 330. When conductor 100 is coiled, its effective portion 111 can be coiled within the shaping groove 320. Correspondingly, the shaping groove 320 can also be provided with n groove layers, corresponding one-to-one with the n groove layers of the conductor groove. After coiling, the shaping teeth 330 can be retracted into the central post 310 to remove the coiled 6m conductor from the central post 310.

[0044] It is understandable that, in this embodiment, when the conductor 100 for winding the 6m branch units of the three phases, which is laid flat and wound on the winding device 200, is taken out of the winding device 200, the effective portion 111 of the conductor 100 for winding the 6m branch units of the three phases is first pre-fixed within the same limiting groove 220. Then, during the coiling process, the pre-fixing between the conductors 100 is removed, which makes it easier to coil the conductors 100 to obtain the stator winding. Furthermore, coiling the conductor 100 for winding the 6m branch units of the three phases on the shaping device 300 makes the coiling of the conductors 100 more convenient.

[0045] Specifically, p=4, Z=48, n=8, m=1. Each phase winding circuit includes two parallel winding branches. Each winding branch includes two branch units connected in series. Each winding branch starts from slot "1" and winds to slot "2" four times, then winds from slot "3" to slot "4" four times, and then winds from slot "5" to slot "6" four times. Four times, starting from slot "7" and winding to slot "8" four times consecutively; starting from slot "8" and winding to slot "7" four times consecutively; starting from slot "6" and winding to slot "5" four times consecutively; starting from slot "4" and winding to slot "3" four times consecutively; starting from slot "2" and winding to slot "1" four times consecutively and exiting the winding.

[0046] like Figure 1 and Figure 2 As shown in this embodiment, the stator assembly can have 8 poles, i.e., p=4; the stator core can have 48 conductor slots evenly spaced circumferentially, i.e., Z=48; each conductor slot can have 8 slot layers, i.e., n=8; and the winding circuit of any phase can include 2 parallel winding branches, and each winding branch can include two branch units connected in series, i.e., m=1. Based on the aforementioned parameters, the stator winding in this embodiment is a three-phase stator winding with 48 slots, 8 poles, 8 layers, and 2 parallel branches, continuously wave-wound.

[0047] like Figure 1 and Figure 2 As shown, in this embodiment, when the stator winding is continuously wave-wound, any winding branch can start from slot "1" and wind to slot "2" four times, and can wind from slot "3" to slot "4" four times, and can wind from slot "5" to slot "6" four times, and can wind from slot "7" to slot "6" four times. The wire can be wound four times in a slot of 8", and can enter from slot 8 and wind to slot 7 and wind four times in a row. It can also wind from slot 6 to slot 5 and wind four times in a row. It can wind from slot 4 to slot 3 and wind four times in a row. It can also wind from slot 2 to slot 1 and wind four times in a row before exiting.

[0048] In other words, each winding branch uses one conductor 100 to wind in the forward direction to form the first branch unit, and then uses another conductor 100 to wind in the reverse direction to form the second branch unit. The first branch unit and the second branch unit are connected in series.

[0049] It should be noted that when the conductors 100 of the two branch units used to wind any one of the winding branches are laid flat and wound, there is no distinction between forward winding and reverse winding; that is, the conductor 100 of any one winding branch used to reverse wind to form the second branch unit can still be regarded as entering from the slot layer with serial number "1" and exiting from the slot layer with serial number "8".

[0050] More specifically, the first winding branch of phase U is: 3.1-9.2-15.1-21.2-27.1-33.2-39.1-45.2-3.3-9.4-15.3-21.4-27.3-33.4-39.3-45.4-3.5-9.6-15.5-21.6-27.5-33.6-39.5-45.6-3.7-9.8-15.7-21.8-27.7-33.8-39.7-45.8-4. 8-46.7-40.8-34.7-28.8-22.7-16.8-10.7-4.6-46.5-40.6-34.5-28.6-22.5-16.6-10.5-4.4-46.3-40.4-34.3-28.4-22.3-16.4-10.3-4.2-46.1-40.2-34.1-28.2-22.1-16.2-10.1; The second winding branch of phase U is: 4.1-10.2-16.1-22.2-28.1-34.2-40.1-46.2-4.3-10.4-16.3-22.4-28.3-34.4-40.3-46.4-4.5-10.6-16.5-22.6-28.5-34.6-40.5-46.6-4.7-10.8-16.7-22.8-28.7-34.8-40.7-46. 8-3.8-45.7-39.8-33.7-27.8-21.7-15.8-9.7-3.6-45.5-39.6-33.5-27.6-21.5-15.6-9.5-3.4-45.3-39.4-33.3-27.4-21.3-15.4-9.3-3.2-45.1-39.2-33.1-27.2-21.1-15.2-9.1.

[0051] like Figure 1As shown in the illustration, in this embodiment, the first winding branch of phase U is used as an example.

[0052] The circuit corresponding to the first branch unit of the first winding branch of phase U is: 3.1-9.2-15.1-21.2-27.1-33.2-39.1-45.2-3.3-9.4-15.3-21.4-27.3-33.4-39.3-45.4-3.5-9.6-15.5-21.6-27.5-33.6-39.5-45.6-3.7-9.8-15.7-21.8-27.7-33.8-39.7-45.8.

[0053] In the first branch unit of the first winding branch of the U-phase, the line corresponding to "3.1-9.2" represents the first wave winding type 110, whose two effective parts 111 are wound in the slot layer with serial number "1" of conductor slot "3" and the slot layer with serial number "2" of conductor slot "9", with a pitch of 6 slots. The entry position of the first branch unit of the first winding branch of the U-phase is "3.1", which is also the entry position of the first winding branch of the U-phase. The subsequent winding lines are similar.

[0054] The circuit corresponding to the second branch unit of the first winding branch of phase U is: 4.8-46.7-40.8-34.7-28.8-22.7-16.8-10.7-4.6-46.5-40.6-34.5-28.6-22.5-16.6-10.5-4.4-46.3-40.4-34.3-28.4-22.3-16.4-10.3-4.2-46.1-40.2-34.1-28.2-22.1-16.2-10.1.

[0055] The winding path of the second branch unit of the first winding branch of phase U is the same as that of the first branch unit of the first winding branch of phase U; however, the winding sequence of the second branch unit of the first winding branch of phase U should be viewed in reverse order. Therefore, the entry position of the second branch unit of the first winding branch of phase U is "10.1".

[0056] The conductor 100 of the first branch unit used for winding the first winding branch of the U phase and the conductor 100 of the second branch unit used for winding the first winding branch of the U phase can be connected at the line corresponding to "45.8-4.8", and the connection method can be welding and fixing.

[0057] It is not difficult to see that the first winding branch of phase U is wound four times continuously from slot "1" to slot "2", four times continuously from slot "3" to slot "4", four times continuously from slot "5" to slot "6", and four times continuously from slot "7" to slot "8". Subsequently, the first winding branch of phase U is wound four times consecutively from slot number "8" to slot number "7", four times consecutively from slot number "6" to slot number "5", four times consecutively from slot number "4" to slot number "3", and four times consecutively from slot number "2" to slot number "1".

[0058] like Figure 1 As shown, the second winding branch of phase U is similar to the first winding branch of phase U. The entry positions of the first branch unit and the second branch unit are "4.1" and "9.1" respectively, and the connection position of the first branch unit and the second branch unit is the line corresponding to "46.8-3.8".

[0059] In this embodiment, the winding lines of phase V and phase W can be obtained by sequentially shifting the winding lines of phase U by Z / 3p = 4 and 2Z / 3p = 4 conductor slots along the direction of increasing conductor slot number. That is, the entry positions of the two branch units of the first winding branch of phase V can be "7.1" and "14.1" respectively, and the entry positions of the two branch units of the second winding branch of phase V can be "8.1" and "13.1" respectively; while the entry positions of the two branch units of the first winding branch of phase W can be "11.1" and "18.1" respectively, and the entry positions of the two branch units of the second winding branch of phase W can be "12.1" and "17.1" respectively. Therefore, among the entry positions of the six branch units of the three phases, the conductor slot with the smallest sequence number is "3", i.e., s = 3.

[0060] When preparing the stator winding, the conductors 100 of the six branch units for winding three phases can be sequentially laid flat on the wiring device 200 in a wave-like manner. During winding, the slot layer with the sequence number "1" of the conductor slot numbered "3" can be aligned with the first slot layer of the first limiting slot 220 at one end of the wiring base 210. The two effective portions 111 of any wave-shaped wire profile 110 formed by any conductor 100 are staggered and arranged in two slot layers of the limiting slot 220. Then, the conductors 100 of the six branch units for winding three phases can be removed from the wiring device 200. When removing them, the effective portions 111 of the conductors 100 of the six branch units for winding three phases wound in the same limiting slot 220 can be pre-fixed, and the pre-fixation between the conductors 100 can be removed during coiling. When coiling, you can start coiling from the conductor groove with the serial number "s" and take the side of the conductor groove with the serial number "1" as the outer radial side of the 6m conductors.

[0061] Example 2 Embodiment 2 of this application provides a method for preparing a stator winding. The difference between this embodiment and Embodiment 1 is at least in the number of parallel winding branches of any phase winding line of the stator winding.

[0062] Specifically, p=4, Z=48, n=8, m=2. Each phase winding circuit includes 4 parallel winding branches. Each winding branch includes one branch unit. Each winding branch enters from slot layer number "1" and winds to slot layer number "2" four times. It winds from slot layer number "3" to slot layer number "4" four times. It winds from slot layer number "5" to slot layer number "6" four times. It winds from slot layer number "7" to slot layer number "8" four times and exits.

[0063] like Figure 2 As shown in this embodiment, by way of example, the number of poles of the stator assembly, the number of conductor slots evenly spaced along the circumference of the stator core, and the number of slot layers in each conductor slot remain unchanged, i.e., p=4, Z=48, n=8; and the winding circuit of any phase can include 4 parallel winding branches, and each winding branch includes one branch unit, i.e., m=2. According to the aforementioned parameters, the stator winding in this embodiment is a three-phase stator winding with 48 slots, 8 poles, 8 layers, and 4 parallel branches, continuously wave-wound.

[0064] like Figure 2As shown, in this embodiment, when the stator winding is continuously wave-wound, any one of its winding branches can start from slot "1" and wind to slot "2" four times consecutively; it can wind from slot "3" to slot "4" four times consecutively; it can wind from slot "5" to slot "6" four times consecutively; and it can wind from slot "7" to slot "8" four times consecutively and then exit. That is, each winding branch uses a single conductor 100 wound in the forward direction to form the first branch unit.

[0065] More specifically, the first winding branch of phase U is: 3.1-9.2-15.1-21.2-27.1-33.2-39.1-45.2-3.3-9.4-15.3-21.4-27.3-33.4-39.3-45.4-3.5-9.6-15.5-21.6-27.5-33.6-39.5-45.6-3.7-9.8-15.7-21.8-27.7-33.8-39.7-45.8; The second winding branch of phase U is: 4.1-10.2-16.1-22.2-28.1-34.2-40.1-46.2-4.3-10.4-16.3-22.4-28.3-34.4-40.3-46.4-4.5-10.6-16.5-22.6-28.5-34.6-40.5-46.6-4.7-10.8-16.7-22.8-28.7-34.8-40.7-46.8; The third winding branch of phase U is: 9.1-15.2-21.1-27.2-33.1-39.2-45.1-3.2-9.3-15.4-21.3-27.4-33.3-39.4-45.3-3.4-9.5-15.6-21.5-27.6-33.5-39.6-45.5-3.6-9.7-15.8-21.7-27.8-33.7-39.8-45.7-3.8; The fourth winding branch of phase U is: 10.1-16.2-22.1-28.2-34.1-40.2-46.1-4.2-10.3-16.4-22.3-28.4-34.3-40.4-46.3-4.4-10.5-16.6-22.5-28.6-34.5-40.6-46.5-4.6-10.7-16.8-22.7-28.8-34.7-40.8-46.7-4.8.

[0066] like Figure 1 and Figure 2 As shown in this embodiment, it is an exemplary illustration. It is easy to see that when the branch unit corresponding to the first winding branch of phase U and the branch unit corresponding to the fourth winding branch of phase U are connected at the line corresponding to "45.8-4.8", the first winding branch of phase U in embodiment one is obtained. Similarly, when the branch unit corresponding to the second winding branch of phase U and the branch unit corresponding to the third winding branch of phase U are connected at the line corresponding to "46.8-3.8", the second winding branch of phase U in embodiment one is obtained. Apart from this, this embodiment is no different from embodiment one.

[0067] Example 3 Embodiment 3 of this application provides a stator winding, which is prepared using any of the stator winding preparation methods provided in this application.

[0068] Example 4 Embodiment 4 of this application provides a stator assembly, which includes any of the stator windings provided in this application.

[0069] Example 5 Embodiment 5 of this application provides an induction motor, which includes any of the stator assemblies provided in this application.

[0070] Comparative Example 1 Comparative Example 1 of this application provides a method for preparing a stator winding. The stator winding is used in a stator assembly, which has three phases: U-phase, V-phase, and W-phase, and 2p poles. The stator assembly also includes a stator core. The stator core has Z conductor slots numbered 1 to Z sequentially arranged circumferentially. Each conductor slot has n slot layers numbered 1 to n sequentially arranged radially. The continuous wave-wound stator winding includes three phase winding lines. Each phase winding line includes 2m branch units. Each branch unit is continuously wound using a conductor 100 in a wave-wound manner, and each wave-wound operation forms a wave-wound profile 110. The wave-wound profile 110 includes two effective portions 111 wound within the conductor slots. The two effective parts 111 of the line type 110 are connected in a layer-by-layer manner: slot layer numbered "1" and slot layer numbered "2", or slot layer numbered "3" and slot layer numbered "4"... or slot layer numbered "n-1" and slot layer numbered "n". Each branch unit enters from slot layer numbered "1" and winds through each pole of the line type 110 in the same layer-by-layer manner, winding from the inside out to exit from slot layer numbered "n". The winding lines of phase V and phase W are obtained by shifting phase U winding lines by Z / 3p and 2Z / 3p conductor slots respectively along the direction of increasing conductor slot number. Among the entry positions of the 6m branch units of the three phases, the conductor slot with the smallest number is "s". The method for preparing stator windings includes the following steps: S1. The conductors 100 used to wind the 6m branch units of the three phases are laid flat in sequence in a wave-wound manner. During the flat-wound, the two effective parts 111 of any wave-wound line 110 formed by any conductor 100 are staggered in the upper and lower layers, and the effective parts 111 of the wave-wound line 110 with different cross-layer methods are staggered in the layers. S2a. Starting from one end, the 6m conductors laid flat and wound are coiled into a ring shape. The 6m conductors 100 are coiled n / 2 turns to the other end. When coiling, the coiling direction of the 6m conductors 100 is the direction in which the conductor slot number decreases. The radial outer side of the 6m conductors 100 is the side where the slot layer with the conductor slot number "1" is located.

[0071] like Figure 9 As shown in this comparative example, the parameters of the stator winding in this comparative example can be exactly the same as those in Embodiment 1, i.e., p=4, Z=48, n=8, m=2, and s=3. The difference between this comparative example and Embodiment 1 lies in steps S2 and S2a. In step S2a, during winding, the direction in which the conductor slot number decreases is used as the winding direction for the 6m conductors 100.

[0072] Comparative Example 2 Comparative Example 2 of this application provides a method for preparing a stator winding. The stator winding is used in a stator assembly, which has three phases: U-phase, V-phase, and W-phase, and 2p poles. The stator assembly also includes a stator core. The stator core has Z conductor slots numbered 1 to Z sequentially arranged circumferentially. Each conductor slot has n slot layers numbered 1 to n sequentially arranged radially. The continuous wave-wound stator winding includes three phase winding lines. Each phase winding line includes 2m branch units. Each branch unit is continuously wound using a conductor 100 in a wave-wound manner, and each wave-wound operation forms a wave-wound profile 110. The wave-wound profile 110 includes two effective portions 111 wound within the conductor slots. The two effective parts 111 of the line type 110 are connected in a layer-by-layer manner: slot layer numbered "1" and slot layer numbered "2", or slot layer numbered "3" and slot layer numbered "4"... or slot layer numbered "n-1" and slot layer numbered "n". Each branch unit enters from slot layer numbered "1" and winds through each pole of the line type 110 in the same layer-by-layer manner, winding from the inside out to exit from slot layer numbered "n". The winding lines of phase V and phase W are obtained by shifting phase U winding lines by Z / 3p and 2Z / 3p conductor slots respectively along the direction of increasing conductor slot number. Among the entry positions of the 6m branch units of the three phases, the conductor slot with the smallest number is "s". The method for preparing stator windings includes the following steps: S1. The conductors 100 used to wind the 6m branch units of the three phases are laid flat in sequence in a wave-wound manner. During the flat-wound, the two effective parts 111 of any wave-wound line 110 formed by any conductor 100 are staggered in the upper and lower layers, and the effective parts 111 of the wave-wound line 110 with different cross-layer methods are staggered in the layers. S2b. Starting from one end, the 6m conductors laid flat and wound are coiled into a ring shape. The 6m conductors 100 are coiled n / 2 turns to the other end. When coiling, the coiling direction of the 6m conductors 100 is the direction in which the conductor slot number increases. The radial inner side of the 6m conductors 100 is the side where the slot layer with the conductor slot number "1" is located.

[0073] like Figure 10 As shown in this comparative example, the parameters of the stator winding in this comparative example can be exactly the same as those in Embodiment 1, i.e., p=4, Z=48, n=8, m=2, and s=3. The difference between this comparative example and Embodiment 1 lies in steps S2 and S2b. In step S2b, during winding, the side containing the slot layer with the conductor slot number "1" is taken as the inner side of the radial direction of the 6m conductors.

[0074] Comparative Example 3 Comparative Example 3 of this application provides a method for preparing a stator winding. The stator winding is used in a stator assembly, which has three phases: U-phase, V-phase, and W-phase, and 2p poles. The stator assembly also includes a stator core. The stator core has Z conductor slots numbered 1 to Z sequentially arranged circumferentially. Each conductor slot has n slot layers numbered 1 to n sequentially arranged radially. The continuous wave-wound stator winding includes winding lines for three phases. Each phase winding line includes 2m branch units. Each branch unit is continuously wound using a conductor 100 in a wave-wound manner, and each wave-wound operation forms a wave-wound profile 110. The wave-wound profile 110 includes two effective portions 111 wound within the conductor slots. The two effective parts 111 of the line type 110 are connected in a layer-by-layer manner: slot layer numbered "1" and slot layer numbered "2", or slot layer numbered "3" and slot layer numbered "4"... or slot layer numbered "n-1" and slot layer numbered "n". Each branch unit enters from slot layer numbered "1" and winds through each pole of the line type 110 in the same layer-by-layer manner, winding from the inside out to exit from slot layer numbered "n". The winding lines of phase V and phase W are obtained by shifting phase U winding lines by Z / 3p and 2Z / 3p conductor slots respectively along the direction of increasing conductor slot number. Among the entry positions of the 6m branch units of the three phases, the conductor slot with the smallest number is "s". The method for preparing stator windings includes the following steps: S1. The conductors 100 used to wind the 6m branch units of the three phases are laid flat in sequence in a wave-wound manner. During the flat-wound, the two effective parts 111 of any wave-wound line 110 formed by any conductor 100 are staggered in the upper and lower layers, and the effective parts 111 of the wave-wound line 110 with different cross-layer methods are staggered in the layers. S2c. Starting from one end, the 6m conductors laid flat and wound are coiled into a ring shape. The 6m conductors 100 are coiled n / 2 turns to the other end. When coiling, the coiling direction of the 6m conductors 100 is the direction in which the conductor slot number decreases. The radial inner side of the 6m conductors 100 is the side where the slot layer with the conductor slot number "1" is located.

[0075] like Figure 11 As shown in this comparative example, the parameters of the stator winding in this comparative example can be exactly the same as those in Embodiment 1, i.e., p=4, Z=48, n=8, m=2, and s=3. The difference between this comparative example and Embodiment 1 lies in steps S2 and S2c. In step S2c, during winding, the direction in which the conductor slot number decreases is taken as the winding direction of the 6m conductors 100, and the side where the slot layer with the conductor slot number "1" is located is taken as the radial inner side of the 6m conductors 100.

[0076] Application Examples The application embodiments of this application use the stator winding preparation method provided in Embodiment 1 of this application to prepare stator winding 1, and use the stator winding preparation methods provided in Comparative Examples 1, 2 and 3 of this application to prepare stator winding 2, 3 and 4 respectively; and the application embodiments of this application use an LCR (Inductance Capacitance Resistance) tester to test the three-phase inductance of stator winding 1, 2, 3 and 4, and obtain the three-phase inductance imbalance of stator winding 1, 2, 3 and 4, and obtain the test data as shown in Table 1.

[0077] Table 1. Three-wire inductance and three-phase inductance imbalance of stator windings

[0078] By comparison, the three-phase inductance imbalance of stator winding one is about 0.9%; while the three-phase inductance imbalance of stator winding two is about 8.0%, stator winding three is about 8.3%, and stator winding four is about 8.8%, all of which are much greater than the three-phase inductance imbalance of stator winding one.

[0079] Therefore, it is understood that this application lays out the conductors 100 used to wind the 6m branch units of the three phases in a wave-wound manner, and coils the 6m conductors 100 from one end to the other end. When coiling, the direction of increasing conductor slot number is taken as the coiling direction, and the side where the slot layer with the conductor slot number "1" is located is taken as the radial outer side of the 6m conductors 100. This can reduce the three-phase inductance imbalance to less than 1%. That is, this application can improve the problem of large inductance imbalance in the stator winding of the continuously wave-wound induction motor due to improper preparation method by through the specified coiling process.

[0080] As for Embodiment 2, it applies the same principle as Embodiment 1, and will not be described in detail here.

[0081] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0082] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method for preparing a stator winding, characterized in that, The stator winding is used in the stator assembly, which has three phases: U, V, and W, with 2p poles. The stator assembly also includes a stator core, which has Z conductor slots numbered 1 to Z in sequence along the circumference. Each conductor slot has n slot layers numbered 1 to n in sequence along the radial direction. The continuous wave-wound stator winding includes three phase winding lines. Each phase winding line includes 2m branch units. Each branch unit is continuously wound with a conductor (100) in a wave-wound manner, and each wave-wound formation forms a wave-wound profile (110). The wave-wound profile (110) includes two effective portions (111) wound in the conductor slots. The two effective parts (111) are connected in a layered manner: slot layer numbered "1" and slot layer numbered "2", or slot layer numbered "3" and slot layer numbered "4"... or slot layer numbered "n-1" and slot layer numbered "n". Each branch unit enters from slot layer numbered "1" and winds through each pole with the same layered winding pattern (110) and winds from the inside out to exit from slot layer numbered "n". The winding lines of the V phase and the W phase are obtained by shifting the winding lines of the U phase by Z / 3p and 2Z / 3p conductor slots respectively along the direction of increasing conductor slot number. Among the entry positions of the 6m branch units of the three phases, the conductor slot with the smallest number is "s". The method for preparing the stator winding includes: The conductors (100) used to wind the 6m branch units of the three phases are laid flat in sequence in a wave-wound manner; during the flat-wound, the two effective parts (111) of any wave-wound line (110) formed by the wave-wound of any conductor (100) are staggered in the upper and lower layers, and the effective parts of the wave-wound line with different cross-layer methods are staggered in the upper and lower layers. The 6m conductors, which are laid flat and wound, are coiled from one end into a ring shape. The 6m conductors are coiled n / 2 turns to reach the other end. When coiling, the coiling direction of the 6m conductors is the direction in which the conductor slot number increases, and the radial outer side of the 6m conductors is the side where the slot layer with the slot number "1" is located.

2. The method for preparing the stator winding according to claim 1, characterized in that, The method for preparing a stator winding according to claim 1 is characterized in that the conductors (100) used to wind the 6m branch units of the three phases are sequentially laid flat in a wave-like manner, including: The conductors (100) used for winding 6m branch units of three phases are sequentially laid flat on a wiring device (200) in a wave-like manner. The wiring device (200) includes a wiring base (210) and limiting grooves (220) disposed on the wiring base (210). When the conductor is laid flat, it is wound within the limiting grooves (220), and the limiting grooves (220) are provided with n groove layers. When laid flat, the limiting grooves (220) are divided into at least n / 2 consecutive groups. Each group consists of Z slots, where the conductor slot with the serial number "s" corresponds to the first group of limiting slots (220). When any conductor (100) traverses each pole with the same cross-layer winding pattern (110), the conductor slots are all located in one group of limiting slots (220). The two effective parts (111) of any wave winding pattern (110) formed by the wave winding of any conductor (100) are staggered and arranged in two slot layers of the limiting slot (220).

3. The method for preparing the stator winding according to claim 2, characterized in that, Starting from one end, the 6m strands of the conductor (100) that are laid flat and wound are coiled into a ring shape. The 6m strands of the conductor (100) are coiled n / 2 turns to reach the other end, including: The 6m conductors (100) laid flat are coiled from one end onto a shaping device (300), wherein the shaping device (300) includes a central post (310) and shaping grooves (320) disposed outside the central post (310). There are Z shaping grooves (320). The effective portion (111) of the conductor (100) is coiled in the shaping grooves (320), and the shaping grooves (320) are provided with n groove layers. The 6m conductors (100) are coiled n / 2 turns to the other end.

4. The method for preparing the stator winding according to claim 1, characterized in that, Given p=4, Z=48, n=8, m=1, each phase's winding circuit includes two parallel winding branches. Each winding branch includes two branch units connected in series. Each winding branch starts from slot "1" and winds to slot "2" four times consecutively, then winds from slot "3" to slot "4" four times consecutively, and then winds from slot "5" to slot "6" four times consecutively. And from slot layer number "7" to slot layer number "8" and continuously wound four times, and from slot layer number "8" to slot layer number "7" and continuously wound four times, and from slot layer number "6" to slot layer number "5" and continuously wound four times, and from slot layer number "4" to slot layer number "3" and continuously wound four times, and from slot layer number "2" to slot layer number "1" and continuously wound four times and exited.

5. The method for preparing the stator winding according to claim 4, characterized in that, The first winding branch of the U phase is: 3.1-9.2-15.1-21.2-27.1-33.2-39.1-45.2-3.3-9.4-15.3-21.4-27.3-33.4-39.3-45.4-3.5-9.6-15.5-21.6-27.5-33.6-39.5-45.6-3.7-9.8-15.7-21.8-27.7-33.8-39.7-45.8-4.8-46.7-40.8-34.7-28.8-22.7-16.8-10.7-4.6-46.5-40.6-34.5-28.6-22.5-16.6-10.5-4.4-46.3-40.4-34.3-28.4-22.3-16.4-10.3-4.2-46.1-40.2-34.1-28.2-22.1-16.2-10.1； The second winding branch of the U phase is: 4.1-10.2-16.1-22.2-28.1-34.2-40.1-46.2-4.3-10.4-16.3-22.4-28.3-34.4-40.3-46.4-4.5-10.6-16.5-22.6-28.5-34.6-40.5-46.6-4.7-10.8-16.7-22.8-28.7-34.8-40.7-46.8-3.8-45.7-39.8-33.7-27.8-21.7-15.8-9.7-3.6-45.5-39.6-33.5-27.6-21.5-15.6-9.5-3.4-45.3-39.4-33.3-27.4-21.3-15.4-9.3-3.2-45.1-39.2-33.1-27.2-21.1-15.2-9.1。 6. The method for preparing a stator winding according to claim 1, characterized in that, p=4, Z=48, n=8, m=2. Each phase winding circuit includes 4 parallel winding branches. Each winding branch includes one branch unit. Each winding branch enters from slot "1" and winds to slot "2" four times. It winds from slot "3" to slot "4" four times. It winds from slot "5" to slot "6" four times. It winds from slot "7" to slot "8" four times and exits.

7. The method for preparing a stator winding according to claim 6, characterized in that, The first winding branch of the U phase is: 3.1-9.2-15.1-21.2-27.1-33.2-39.1-45.2-3.3-9.4-15.3-21.4-27.3-33.4-39.3-45.4-3.5-9.6-15.5-21.6-27.5-33.6-39.5-45.6-3.7-9.8-15.7-21.8-27.7-33.8-39.7-45.8； The second winding branch of the U phase is: 4.1-10.2-16.1-22.2-28.1-34.2-40.1-46.2-4.3-10.4-16.3-22.4-28.3-34.4-40.3-46.4-4.5-10.6-16.5-22.6-28.5-34.6-40.5-46.6-4.7-10.8-16.7-22.8-28.7-34.8-40.7-46.8； The third winding branch of the U phase is: 9.1-15.2-21.1-27.2-33.1-39.2-45.1-3.2-9.3-15.4-21.3-27.4-33.3-39.4-45.3-3.4-9.5-15.6-21.5-27.6-33.5-39.6-45.5-3.6-9.7-15.8-21.7-27.8-33.7-39.8-45.7-3.8； The fourth winding branch of the U phase is: 10.1-16.2-22.1-28.2-34.1-40.2-46.1-4.2-10.3-16.4-22.3-28.4-34.3-40.4-46.3-4.4-10.5-16.6-22.5-28.6-34.5-40.6-46.5-4.6-10.7-16.8-22.7-28.8-34.7-40.8-46.7-4.8。 8. A stator winding, characterized in that the stator winding is prepared by the stator winding preparation method according to any one of claims 1 to 7.

9. A stator assembly, characterized in that, The stator assembly includes the stator winding as described in claim 8.

10. An induction motor, characterized in that, The induction motor includes the stator assembly as described in claim 9.

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