A phase winding, a stator, and an electric machine

Abstract

The present invention discloses a phase winding, a stator and a motor. Each branch of the phase winding is formed by connecting at least one coil loop. The coil loop is formed by sequentially connecting P single coils, where P is the number of pole pairs of the phase winding. The single coil includes a first type of U-shaped conductor and a second type of U-shaped conductor. One of the first type of U-shaped conductor or the second type of U-shaped conductor in the branch is two corresponding single-foot conductors. The ends of the two single-foot conductors corresponding to the head of the single coil are connection ends close to each other, and the other ends are legs bent circumferentially. The legs of the two single-foot conductors are respectively connected to the legs of adjacent first type of U-shaped conductors or second type of U-shaped conductors. The phase winding, stator and motor of the present invention all have the advantages of reasonable structural design, low assembly and welding difficulty, being beneficial to reducing the assembly and welding difficulty, reducing the use of useless copper, and improving the assembly efficiency and assembly quality.

Description

Technical Field

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

[0002] A motor (including an electric motor and a generator) is a device that converts electrical energy into mechanical energy (or converts mechanical energy into electrical energy) according to the principle of electromagnetic induction, and can be used as a power source or a power generation device for various electrical appliances such as household appliances and various machinery such as electric vehicles and electric cars. Motors can be divided into DC motors and AC motors according to the type of their working power supply, and AC motors can be further divided into single-phase motors and polyphase motors (such as three-phase motors, etc.). A motor includes a stator and a rotor, and windings are arranged in the stator core slots of the stator. The existing motor winding forms are wave windings and lap windings. For a segmented hairpin winding motor using flat copper wires or copper wires with a rectangular cross-section, using a lap winding will result in too many bridging conductors between the lap-wound coils, increasing the usage amount of ineffective copper. Therefore, this type of motor usually uses a wave winding.

[0003] The prior art usually adopts a multi-layer wave winding. This winding structure requires various special shapes and conductors with various long spans or short spans to achieve the bridging between the hairpin conductor layers, resulting in a wide variety of hairpin conductors, increasing the assembly difficulty and cost. Summary of the Invention

[0004] Aiming at the deficiencies of the above prior art, the technical problem to be solved by the present invention is: how to provide a phase winding, a stator and a motor with a reasonable structural design, fewer types of hairpins, low cost, which is beneficial to reducing the assembly difficulty, improving the assembly efficiency and assembly quality.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A phase winding, characterized in that it includes at least one branch, each branch is connected by at least one coil ring, and the coil ring includes P monomer coils connected in sequence, where P is the number of pole pairs;

[0007] The monomer coil includes at least two hairpin conductors. The hairpin conductor includes a hairpin body bent in a U shape as a whole. The hairpin body includes two leg parts arranged in parallel with each other and a head connected to one end of the two leg parts. Each of the other ends of the two leg parts is provided with a foot; the hairpin conductors on the same monomer coil are connected in series in sequence to form a monomer coil in a ring shape as a whole, and the monomer coil has two feet that are bent in opposite directions in the width direction.

[0008] A hairpin conductor on at least one single coil in the branch circuit is composed of two single-leg conductors correspondingly arranged at the position of its leg portion, one end of the single-leg conductor is a leg, and the leg is consistent with the leg of the hairpin conductor at the corresponding position, and the other end is a connecting end.

[0009] Usually, in the assembly state of the flat wire motor, the hairpin body pre-bent into a regular U shape is first inserted from one end of the stator so that the legs pass through the stator, and then the legs on the stator are bent layer by layer along the circumferential direction using a bending device, and then the legs are cut to finally form the hairpin conductor. Each branch is annular in the circumferential direction of the stator, and has a power connection end for connecting to a power source and a star point connection end for connecting to a star point. Since a hairpin conductor on a single coil in each branch is two single-leg conductors correspondingly arranged at the position where its leg portion is located, in the assembly state, the two ends of the single-leg conductor are respectively located at the two ends of the stator, one end of which is a leg, and the deflection and bending direction of the leg is consistent with that of the other legs located on the same layer in the radial direction. Since the two single-leg conductors each have a connection end, and are located at the other end of the end where the leg is located, in this way, the connection ends of the two single-leg conductors can be used as power connection ends and star point connection ends respectively. Since the legs of all hairpin conductors and single-leg conductors are located at the same end of the stator, there is no need to consider the output connection of the motor at this end. In the assembled state, all the legs can be bent layer by layer and then cut uniformly, making cutting more convenient and neater, and facilitating subsequent automated welding operations, thereby improving assembly efficiency and quality.

[0010] As an optimization, the hairpin conductor includes the first type of U-shaped conductor and the second type of U-shaped conductor, the legs of the first type of U-shaped conductor and the legs of the second type of U-shaped conductor are deflected and bent in opposite directions in the width direction of the hairpin body, and the first type of U-shaped conductor and the second type of U-shaped conductor are arranged side by side in the thickness direction of the hairpin body, so that the legs of the first type of U-shaped conductor that are deflected and bent outward and the legs of the second type of U-shaped conductor that are deflected and bent outward are away from each other, and the legs of the first type of U-shaped conductor that are deflected and bent toward the middle and the legs of the second type of U-shaped conductor that are deflected and bent toward the middle are connected to form the single coil.

[0011] In this way, each single coil is composed of two types of hairpin conductors, namely the first type of U-shaped conductor and the second type of U-shaped conductor, and a hairpin conductor in a branch is two corresponding single-pin conductors. Since the two single-pin conductors are used to connect the star point and the power supply respectively, the structures of the two single-pin conductors are different. Therefore, a branch is composed of four conductors with fewer hairpin types, which is conducive to reducing mold opening costs and assembly difficulty, and improving assembly efficiency and assembly quality.

[0012] Further, the hairpin conductor further includes an O-shaped conductor with an overall annular shape. The two legs of the O-shaped conductor are bent towards the middle in the width direction of the hairpin body and are arranged at a staggered interval in the thickness direction of the hairpin body. The O-shaped conductor is stacked with the second type of U-shaped conductor layer in the thickness direction of the first type of U-shaped conductor, so that the two legs of the O-shaped conductor are respectively connected to the other legs adjacent in the thickness direction, and the legs of the first type of U-shaped conductor that are bent outwards and the legs of the second type of U-shaped conductor that are bent outwards are separated from each other to form the single coil.

[0013] In this way, adding the O-shaped conductor makes only one type of conductor added to one branch. Still, it can increase the number of turns of each single coil with fewer types of hairpins, which is suitable for use in high-speed motors.

[0014] As an optimization, the phase winding includes one branch or two branches arranged in parallel. In the same phase winding, Q coil rings located on Q slot positions that are continuously adjacent in the circumferential direction of the stator in the assembled state are sequentially connected in series to form a coil ring group, where Q is the number of slots per pole per phase and is an integer. For the single coil conductors on the two mutually connected single coils in the two coil ring groups in the same phase winding, each has a single-leg conductor corresponding to the position of its leg part. One end of the single-leg conductor is a leg, and this leg is consistent with the leg of the hairpin conductor at this corresponding position, and the other end is a connection end.

[0015] Since each of the two mutually connected single coils in each coil ring group has a single-leg conductor corresponding to the position of its leg part, there are four single-leg conductors on one phase winding. In the case of one branch, connecting the two connection ends of the four single-leg conductors to each other can achieve the series connection of the two coil ring groups to form one branch, and the other two connection ends are respectively used to connect to the star point and the power supply. In the case of two branches, each coil ring group is a branch. The two single-leg conductors on each branch are respectively used to connect to the star point and the power supply. Since the two branches are arranged in parallel, the connection ends used to connect to the star point on the two branches finally need to be connected to each other, and the connection ends used to connect to the power supply also need to be connected to each other. That is, the mutually connected single coils can be the single coils used to connect to the star point or the single coils all used to connect to the power supply.

[0016] Further, the two single-leg conductors on the same single coil are combined into a lead conductor group, and the single coils where the lead conductor groups are located on the two coil ring groups in the same phase winding are adjacent in the circumferential direction of the phase winding.

[0017] Since the two lead conductor groups are located at the positions of two circumferentially adjacent single coils, the distances between the power connection ends and between the star point connection ends in the two lead conductor groups are closer, thereby shortening the jumper conductors for connecting the power connection ends and the star point connection ends and reducing the amount of useless copper used.

[0018] Further, two said coil loop groups in the same phase winding are connected in series to form one branch or in parallel to form two branches; the connection ends of the two single-leg conductors for series connection in the two coil loop groups connected in series are welded together, or the two single-leg conductors for series connection in the two coil loop groups connected in series are large-span hairpin conductors integrally bent and formed at the positions corresponding to their leg parts; the connection ends of the two single-leg conductors for connecting the power supply in the two coil loop groups connected in parallel are welded together, or the two single-leg conductors for connecting the power supply in the two coil loop groups connected in parallel are large-span hairpin conductors integrally bent and formed at the positions corresponding to their leg parts.

[0019] Further, each said coil loop group includes Q coil loops located on Q circumferentially consecutive slots of the stator in the assembled state, Q is the number of slots per pole per phase and is an integer greater than 1; in the same coil loop group, two coil loops located on adjacent slots are connected to each other, and the pitch of the hairpin conductor on the last single coil of the previous coil loop in the clockwise or counterclockwise direction is Y + 1, so that the leg at the end of the hairpin conductor with a pitch of Y + 1 is arranged side by side with the leg connected to it on the next coil loop in the radial direction of the phase winding; the pitch of the hairpin conductor on the last single coil of the last coil loop in the clockwise or counterclockwise direction is Y - Q + 1, and the pitches of all other hairpin conductors are Y.

[0020] With the above structure, for the coil loops located on Q circumferentially consecutive slots of the stator, in two mutually connected coil loops, the output leg of the previous coil loop in the current direction and the input leg of the next coil loop are arranged side by side in the radial direction of the phase winding. Without using a jumper conductor, they can be directly welded in series. Since the connecting legs inside each coil loop are at adjacent positions in the same slot, with the above structure, all the legs of the entire phase winding can be welded together without using a jumper conductor, greatly reducing the overall assembly difficulty and welding difficulty of the motor and being beneficial to improving the assembly quality and assembly efficiency.

[0021] As an optimization, the phase winding includes four branches arranged in parallel. Each branch includes a coil loop, and the coil loop is formed by sequentially connecting P single coils, where P is the number of pole pairs and is an even number. Each of the coil loops has at least a pair of hairpin conductors with a pitch of Y + 1 and a pair of hairpin conductors with a pitch of Y - 1. The hairpin conductors with a pitch of Y + 1 and the hairpin conductors with a pitch of Y - 1 are circumferentially evenly distributed, and the pitches of all other hairpin conductors are Y. The feet of the hairpin conductors with a pitch of Y + 1 and the feet of the hairpin conductors with a pitch of Y - 1 have the same deflection direction in the circumferential direction of the coil loop. The hairpin conductors with a pitch of Y + 1 on one branch and the hairpin conductors with a pitch of Y - 1 on another branch in the circumferentially adjacent slot positions are located in circumferentially adjacent slot positions.

[0022] Since two branches with the same current direction are usually arranged in circumferentially adjacent slot positions, there is always a mechanical angle of 360 / Z° between the two branches, where Z is the total number of slots, so that there is a potential difference between the two branches to form a circulating current. With the above structure, the hairpin conductors with a pitch of Y + 1 on one branch and the hairpin conductors with a pitch of Y - 1 on another branch in the circumferentially adjacent slot positions are located in circumferentially adjacent slot positions. Compared with the branches composed of hairpin conductors with all the same pitches, half of the single coils on the branch can remain in their original positions, while the other half of the single coils move one slot pitch clockwise or counterclockwise. And half of the single coils on the two branches move one slot pitch in opposite directions in the circumferential direction, that is, half of the single coils on the two branches have a difference of +360 / Z° mechanical angle, and the other half have a difference of -360 / Z° mechanical angle, so as to avoid the formation of a circulating current due to the potential difference between the two branches.

[0023] Further, the two single-foot conductors on the same single coil are combined into a lead conductor group. The two branches located in circumferentially adjacent slot positions of the stator in the assembled state are taken as a group. The single coils where the lead conductor groups on the two branches in the same group are located are in two circumferentially adjacent slot positions on the phase winding where they are located, and the single coils where the lead conductor groups on the two branches in one group are located and the single coils where the lead conductor groups on the two branches in the other group are located are adjacent in the circumferential direction of the phase winding where they are located.

[0024] As an optimization, the feet deflection directions and pitches of the hairpin conductors corresponding to the single-foot conductors on each branch are equal.

[0025] That is to say, each single-foot conductor on each branch corresponds to a first type of U-shaped conductor with a consistent pitch; or corresponds to a second type of U-shaped conductor with a consistent pitch; or corresponds to an O-shaped conductor with a consistent pitch. In this way, fewer types of conductors can be used for all branches in all phase windings, thus reducing the mold opening cost.

[0026] Further, the two leg portions of the first type of U-shaped conductor and the second type of U-shaped conductor are both arranged in a staggered manner in the thickness direction of their hairpin-shaped bodies. The second type of U-shaped conductor is located between the two leg portions of the first type of U-shaped conductor in the thickness direction of the first type of U-shaped conductor, and the head of the second type of U-shaped conductor is wrapped inside the head of the first type of U-shaped conductor; in the assembled state, the leg portions located at the same slot position in the stator are radially divided into a first-layer conductor, a second-layer conductor, a third-layer conductor, and a fourth-layer conductor from outside to inside; the two leg portions of the first type of U-shaped conductor are respectively the first-layer conductor and the fourth-layer conductor of their respective slot positions, and the two leg portions of the second type of U-shaped conductor are respectively the second-layer conductor and the third-layer conductor of their respective slot positions.

[0027] Further, the two leg portions of the first type of U-shaped conductor and the second type of U-shaped conductor are both arranged in a staggered manner in the thickness direction of their hairpin-shaped bodies. The second type of U-shaped conductor is located between the two leg portions of the first type of U-shaped conductor in the thickness direction of the first type of U-shaped conductor, and the head of the second type of U-shaped conductor is wrapped inside the head of the first type of U-shaped conductor; the O-shaped conductor is located between the two leg portions of the first type of U-shaped conductor in the thickness direction of the first type of U-shaped conductor and is arranged in a stacked manner with the second type of U-shaped conductor; the leg portions located at the same slot position on the stator are radially divided into a first-layer conductor, a second-layer conductor... an A-layer conductor from outside to inside, where A is an even number greater than 4; the two leg portions of the first type of U-shaped conductor are respectively the first-layer conductor and the A-layer conductor of their respective slot positions, the two leg portions of the second type of U-shaped conductor are respectively the second-layer conductor and the third-layer conductor or the (A - 1)-layer conductor and the (A - 2)-layer conductor of their respective slot positions, and the leg portions of the O-shaped conductor are respectively the 2n-layer conductor and the 2n + 1-layer conductor or the A - 2n-layer conductor and the A - 2n + 1-layer conductor of their respective slot positions, where 2 ≤ n ≤ A / 2 - 1.

[0028] A stator, characterized in that it includes a stator core and a multi-phase phase winding mounted on the stator core as described above. Power terminals are respectively connected to the connection ends for connecting the power supply on the multi-phase phase windings, and the connection ends for connecting the star point on the multi-phase phase windings are welded together through a star point connection conductor, or the hairpin conductors where all or part of the connection ends for connecting the star point on the multi-phase phase windings are integrally preformed and connected.

[0029] A motor, characterized in that it includes the stator as described above.

[0030] In summary, the phase winding, stator, and motor of the present invention all have the advantages of reasonable structural design, few types of hairpins, low cost, being conducive to reducing the assembly difficulty, improving the assembly efficiency, and improving the assembly quality. Description of the Drawings

[0031] Figure 1 It is a schematic structural diagram of the stator in Embodiment 1.

[0032] Figure 2 It is a schematic structural diagram of a phase winding in Embodiment 1.

[0033] Figure 3 For Figure 2 It is an enlarged schematic structural diagram at the circled part in

[0034] Figure 4 For Figure 2 It is a schematic structural diagram of a branch in

[0035] Figure 5 For Figure 4 It is an enlarged schematic structural diagram at the circled part in

[0036] Figure 6 And Figure 7 It is a schematic structural diagram of a coil loop.

[0037] Figure 8 It is a schematic structural diagram of a first type of U-shaped conductor.

[0038] Figure 9 It is a schematic structural diagram of a second type of U-shaped conductor.

[0039] Figure 10 It is a schematic structural diagram of a single coil.

[0040] Figure 11 For Figure 6 It is a schematic structural diagram in which a hairpin conductor in is correspondingly set as a single-foot conductor.

[0041] Figure 12 For Figure 7 It is a schematic structural diagram in which a hairpin conductor in is correspondingly set as a single-foot conductor.

[0042] Figure 13 It is a layout diagram of the conductor layer of the single coil in the stator core slot (connection side) in Embodiment 1.

[0043] Figure 14 It is a layout diagram of the conductor layer of the single coil in the stator core slot (insertion side) in Embodiment 1.

[0044] Figure 15 It is a schematic structural diagram of an O-shaped conductor.

[0045] Figure 16 It is a schematic structural diagram of the single coil in Embodiment 2.

[0046] Figure 17Layout diagram of the conductor layer of the single coil in the stator core slot in Embodiment 2 (connection side).

[0047] Figure 18 Layout diagram of the conductor layer of the single coil in the stator core slot in Embodiment 2 (insertion side).

[0048] Figure 19 Schematic structural diagram of welding the power supply lead conductor 6 of one phase winding in Embodiment 2.

[0049] Figure 20 For Figure 19 Enlarged structural diagram at the circle in

[0050] Figure 21 For Figure 19 Schematic structural diagram of the phase winding in

[0051] Figure 22 Schematic structural diagram of the stator in Embodiment 2.

[0052] Figure 23 For Embodiment 3 and Figure 6 Corresponding schematic structural diagram of the coil ring.

[0053] Figure 24 For Embodiment 3 and Figure 7 Corresponding schematic structural diagram of the coil ring.

[0054] Figure 25 Schematic structural diagram of one phase winding in Embodiment 3.

[0055] Figure 26 For Figure 25 Enlarged structural diagram at the circle in

[0056] Figure 27 Schematic structural diagram of the stator in Embodiment 3.

[0057] Figure 28 And Figure 29 Schematic structural diagram of the branches located on two adjacent slots in Embodiment 3.

[0058] Figure 30 For Figure 28 And Figure 29 Combined schematic structural diagram.

[0059] Figures 31 - 34 Schematic structural diagram of each branch in Embodiment 4.

[0060] Figure 35 Schematic structural diagram of one phase winding in Embodiment 4.

[0061] Figure 36 For Figure 35Schematic diagram of the enlarged structure at the middle circle.

[0062] Figure 37 Schematic diagram of the structure of the stator of Embodiment 4.

[0063] Figure 38 Schematic diagram of the structure of the stator of Embodiment 5.

[0064] Figure 39 is Figure 38 Schematic diagram of the structure of the three-phase phase windings in

[0065] Figure 40 is Figure 38 Schematic diagram of the structure of one phase winding in

[0066] Figure 41 Schematic diagram of the structure of one branch in Embodiment 5.

[0067] Figure 42 is Figure 41 Schematic diagram of the structure of two single-foot conductors in

[0068] Figure 43 Schematic diagram of the structure of the stator of Embodiment 6.

[0069] Figure 44 Schematic diagram of the structure of one phase winding in Embodiment 6.

[0070] Figure 45 is Figure 44 Schematic diagram of the structure of the large-span hairpin conductor in

[0071] Figure 46 is Figure 43 Schematic diagram of the structure in which the star-point connecting conductor and the corresponding single-foot conductor are integrally formed in Detailed implementation manners

[0072] The following further describes in detail the detailed implementation manners of the present invention with reference to the accompanying drawings.

[0073] Embodiment 1: 4 wires and two branches, number of slots per pole per phase Q = 2

[0074] As Figures 1 - 14 shown, a motor includes a stator, the stator includes a stator core 8 and three-phase phase windings mounted on the stator core 8. One ends of all branches on all phase windings are connected to each other through a star-point connecting conductor 7, and the other ends of the two parallel branches on each phase winding are connected in parallel through a power supply lead-out conductor 6, as Figure 2 and Figure 3 shown.

[0075] The stator core 8 includes a main body that is generally cylindrical, and a plurality of stator core slots that are radially open inward are circumferentially arranged on the inner ring of the stator core 8, wherein the upper end of the stator core slot is an insertion side (or crown side), and the lower end is a connection side.

[0076] In this embodiment, the number of slots per pole per phase is Q=2, and each branch circuit includes two coil rings 5 ​​which are connected in series in two slots which are consecutively adjacent to each other in the stator circumferential direction in the assembled state. Figure 4 and Figure 5 shown.

[0077] In this embodiment, the number of pole pairs of the motor is P=4, and the coil ring 5 is formed by connecting four single coils 4 in sequence along the circumferential direction of the stator core 8. Figure 6 and Figure 7 shown.

[0078] In this embodiment, the single coil 4 includes a first type of U-shaped conductor 1 and a second type of U-shaped conductor 2. Figure 8 and Figure 9 As shown, the first type of U-shaped conductor 1 and the second type of U-shaped conductor 2 both include a hairpin body that is bent in a U shape as a whole, and the hairpin body includes two leg parts I arranged in parallel with each other and a head part II connected to one end of the two leg parts I, and the other end of the two leg parts I is respectively provided with a foot III, and the two feet III located on the same hairpin body are deflected and bent toward the same side in the width direction of the hairpin body; the first type of U-shaped conductor 1 and the second type of U-shaped conductor 2 are arranged side by side in the thickness direction of the hairpin body, and the deflection and bending directions of the foot III of the first type of U-shaped conductor 1 and the foot III of the second type of U-shaped conductor 2 are opposite, so that the foot III deflected and bent outward in the first type of U-shaped conductor 1 and the foot III deflected and bent outward in the second type of U-shaped conductor 2 are separated from each other, and the foot III deflected and bent toward the middle of the first type of U-shaped conductor 1 and the foot III deflected and bent toward the middle of the second type of U-shaped conductor 2 are connected to form the single coil 4, as shown Figure 10 As shown; the two legs of the first type U-shaped conductor and the second type U-shaped conductor are staggered in the thickness direction of the hairpin body, the second type U-shaped conductor is located between the two legs of the first type U-shaped conductor in the thickness direction of the first type U-shaped conductor, and the head of the second type U-shaped conductor is covered in the head of the first type U-shaped conductor.

[0079] In this embodiment, Figure 6 As shown, the first type of U-shaped conductor 1-a1 on a single coil 4 on one of the branches is a single-leg conductor 1-a2 and a single-leg conductor 1-a3 correspondingly arranged at the position where the leg portion is located. Figure 11As shown, one end of the single-leg conductor 1-a2 and the single-leg conductor 1-a3 is a leg matching the corresponding monomer coil, and the other end is a connection end for connecting to the star point or power supply.

[0080] As Figure 7 shown, the first type of U-shaped conductor 1-b1 on a monomer coil 4 on another branch is the single-leg conductor 1-b2 and the single-leg conductor 1-b3 correspondingly arranged at the position where its leg part is located. As Figure 12 shown, one end of the single-leg conductor 1-b2 and the single-leg conductor 1-b3 is a leg matching the corresponding monomer coil, and the other end is a connection end for connecting to the star point or power supply.

[0081] In this embodiment, as Figure 4 and Figure 5 shown, on the same branch, in the direction of the front view of the insertion side, in the clockwise direction, the pitch of the first type of U-shaped conductor 1-c on the last monomer coil of the previous coil loop is Y + 1, that is, its leg part deviates outward by one slot position in the clockwise direction. In this way, the leg of the first type of U-shaped conductor 1 with a pitch of Y + 1 is located on the same slot as the leg (the starting leg of the latter coil loop) connected in series with it on the latter coil loop, which is convenient for direct welding connection.

[0082] While the pitch of the first type of U-shaped conductor (replaced by the single-leg conductor 1-b2 and a single-leg conductor 1-b3) on the last monomer coil of the last coil loop in the clockwise direction is Y - 1, that is, its leg part deviates inward by one slot position in the clockwise direction, just occupying the slot vacated after the leg part of the first type of U-shaped conductor on the last monomer coil of the previous coil loop deviates outward by one slot position, realizing the position swapping. The pitches of all other first type of U-shaped conductors 1 and second type of U-shaped conductors 2 are Y.

[0083] As Figure 2 and Figure 3 shown, on two branches connected in parallel on the same phase winding, the single-leg conductor 1-b2 for connecting to the power supply on the monomer coil 4 of one branch is welded to the single-leg conductor 1-a3 for connecting to the power supply on the monomer coil 4 of the other branch, and is also welded to the power supply lead conductor 6. At the same time, the two single-leg conductors on the same monomer coil are combined into a lead conductor group, and the monomer coils where the lead conductor groups are located on the two branches connected in parallel are adjacent to each other in the circumferential direction of the corresponding phase winding. Since the two lead conductor groups are at the positions of two circumferentially adjacent monomer coils, the distances between the power connection ends and between the star point connection ends in the two lead conductor groups are closer, thereby shortening the jumper conductors for connecting the power connection end and the star point connection end and reducing the usage amount of useless copper.

[0084] In this embodiment, the first type of U-shaped conductors 1-a1 corresponding to the single-legged conductors 1-a2 and 1-a3, and the first type of U-shaped conductors 1-b1 corresponding to the single-legged conductors 1-b2 and 1-b3 are all first type of U-shaped conductors with a pitch of Y-1. At the same time, in specific implementation, in order to make the single-legged conductors 1-b2 and 1-a3 more conveniently welded and connected to the power supply lead conductor 6, the connection ends of the first type of U-shaped conductors 1-a1 and 1-b1 are extended to adjacent positions.

[0085] As Figure 8 and Figure 9 shown, the first type of U-shaped conductor 1 and the second type of U-shaped conductor 2 are both bent from copper wires with a rectangular cross-section. The head II of the first type of U-shaped conductor 1 and the second type of U-shaped conductor 2 is V-shaped with a tip. The two sides and the two leg parts I of the head II are arranged in a front-back dislocation along the radial direction of the coil ring, that is, in a front-back dislocation along the thickness direction of their respective hairpin bodies. The second type of U-shaped conductor 2 is located between the two leg parts I of the first type of U-shaped conductor 1 in the thickness direction of the first type of U-shaped conductor 1, as Figure 10 shown, and the head II of the second type of U-shaped conductor 2 is covered inside the head II of the first type of U-shaped conductor 1.

[0086] In specific implementation, the head II can also be set to an arc shape.

[0087] Figure 13 and Figure 14 respectively show the conductor layer arrangement methods of the monomer coil 4 on the connection side and the insertion side. For the convenience of description, the leg parts I located at the same slot position are divided into the first layer conductor L1, the second layer conductor L2, the third layer conductor L3, and the fourth layer conductor L4 from the outside to the inside in the radial direction; the two leg parts I of the first type of U-shaped conductor 1 are the first layer conductor L1 and the fourth layer conductor L4 of their respective slot positions, and the two leg parts I of the second type of U-shaped conductor 2 are the second layer conductor L2 and the third layer conductor L4 of their respective slot positions.

[0088] In the specific use process, the following four arrangement methods can be adopted in the radial direction of the above monomer coil 4:

[0089] The first one: Set the outwardly bent leg III of the first type of U-shaped conductor 1 as the first layer conductor L1 and extend it clockwise along the circumference. Set the outwardly bent leg III of the second type of U-shaped conductor 2 as the second layer conductor L2 and extend it counterclockwise along the circumference. Set the inwardly bent leg III of the second type of U-shaped conductor 2 as the third layer conductor L3. Set the inwardly bent leg III of the first type of U-shaped conductor 1 as the fourth layer conductor L4 and connect it to the third layer conductor, and generally welding is used here.

[0090] The second type: Set the outwardly bent leg Ⅲ of the first type of U-shaped conductor 1 as the first-layer conductor L1 and extend it counterclockwise along the circumference. Set the outwardly bent leg Ⅲ of the second type of U-shaped conductor 2 as the second-layer conductor L2 and extend it clockwise along the circumference. Set the inwardly bent leg Ⅲ of the second type of U-shaped conductor 2 as the third-layer conductor L3. Set the inwardly bent leg Ⅲ of the first type of U-shaped conductor 1 as the fourth-layer conductor L4 and connect it to the third-layer conductor.

[0091] The third type: Set the outwardly bent leg Ⅲ of the first type of U-shaped conductor 1 as the fourth-layer conductor L4 and extend it clockwise along the circumference. Set the outwardly bent leg Ⅲ of the second type of U-shaped conductor 2 as the third-layer conductor L3 and extend it counterclockwise along the circumference. Set the inwardly bent leg Ⅲ of the second type of U-shaped conductor 2 as the second-layer conductor L2. Set the inwardly bent leg Ⅲ of the first type of U-shaped conductor 1 as the first-layer conductor L1 and connect it to the second-layer conductor.

[0092] The fourth type: Set the outwardly bent leg Ⅲ of the first type of U-shaped conductor 1 as the fourth-layer conductor L4 and extend it clockwise along the circumference. Set the outwardly bent leg Ⅲ of the second type of U-shaped conductor 2 as the third-layer conductor L3 and extend it counterclockwise along the circumference. Set the inwardly bent leg Ⅲ of the second type of U-shaped conductor 2 as the second-layer conductor L2. Set the inwardly bent leg Ⅲ of the first type of U-shaped conductor 1 as the first-layer conductor L1 and connect it to the second-layer conductor.

[0093] Among them, the clockwise and counterclockwise directions are judged with the connection side of the stator core 8 as the front. Inward means pointing between the two leg parts Ⅰ of the U-shaped conductor, and outward means pointing outside the two legs of the U-shaped conductor.

[0094] For the convenience of wiring and connection, the ends of the leg Ⅲ of the first type of U-shaped conductor 1 and the second type of U-shaped conductor 2 both have connection feet Ⅳ arranged parallel to the leg part Ⅰ, and the two connected connection feet Ⅳ are arranged adjacent to each other in the radial direction.

[0095] In this embodiment, the stator adopts the first method. And in this embodiment, the number of pole pairs P of the stator is 4, the number of slots per pole per phase Q is 2, the number of stator core slots Z is 48 slots, the number of conductors per slot A is 4, the pitch Y is 6, and the number of parallel branches R is 2.

[0096] In this embodiment, it is a three-phase stator winding. Therefore, 3 of the two-branch phase windings are arranged in the circumferential direction of the stator to form a three-phase stator winding, as Figures 1 - 3 shown.

[0097] Embodiment 2: 8 wires and two branches, the number of slots per pole per phase Q = 2

[0098] Based on Example 1, the main difference from Example 1 is:

[0099] like Figures 15 - 22 As shown, each of the single coils 4 also includes two O-shaped conductors 3 that are generally annular. Figure 15 As shown, the O-shaped conductor 3 includes a hairpin body that is bent in a U-shape as a whole, and the hairpin body includes two leg parts I arranged in parallel with each other and a head part II connected to one end of the two leg parts I, and the other end of each of the two leg parts I is provided with a foot III, and the two feet III are bent toward the middle in the width direction of the hairpin body and are staggered and spaced in the thickness direction of the hairpin body.

[0100] The two leg portions I of the first-type U-shaped conductor 1 and the second-type U-shaped conductor 2 are staggered in the thickness direction of the hairpin body; the second-type U-shaped conductor 2 is located between the two leg portions I of the first-type U-shaped conductor 1 in the thickness direction of the first-type U-shaped conductor 1, and the head portion II of the second-type U-shaped conductor 2 is covered in the head portion II of the first-type U-shaped conductor 1.

[0101] The O-shaped conductor 3 is located between the two legs I of the first-type U-shaped conductor 1 in the thickness direction of the first-type U-shaped conductor 1, and is stacked with the second-type U-shaped conductor 2, forming the two legs III of the O-shaped conductor 3 connected to the other legs III adjacent in the thickness direction, and the legs III of the first-type U-shaped conductor 1 bent outward and the legs III of the second-type U-shaped conductor 2 bent outward are away from each other. Figure 16 shown.

[0102] In addition, similar to the first embodiment, the single coil 4 with the O-shaped conductor 3 added has four basic arrangement modes according to the different extension directions and positions in the slot of the outwardly deflected and bent legs III of the first type of U-shaped conductor 1, as follows:

[0103] The first type: the leg portion I where the outward-bent leg III of the first type U-shaped conductor 1 is located is set as the first layer conductor and extends in a clockwise direction along the circumference.

[0104] The second method is to set the leg portion I where the outward-bent leg III of the first type U-shaped conductor 1 is located as the first layer conductor and extend it in the counterclockwise direction along the circumference.

[0105] The third method is to set the leg portion I where the outward-bent leg III of the first type U-shaped conductor 1 is located as the A-layer conductor and extend it in a clockwise direction along the circumference.

[0106] The fourth type: Set the leg portion Ⅰ where the outwardly deflected leg Ⅲ of the first type of U-shaped conductor 1 is located as the A-layer conductor and extend it counterclockwise along the circumference.

[0107] Among them, the clockwise and counterclockwise directions are judged with the connection side of the stator core 8 as the front. Inward means pointing between the two leg portions Ⅰ of the U-shaped conductor, and outward means pointing outside the two legs of the U-shaped conductor.

[0108] The second type of U-shaped conductor 2 and the O-shaped conductor 3 stacked inside the first type of U-shaped conductor 1 have combination forms according to their different permutation and combination orders, where n is the sum of the numbers of the second type of U-shaped conductor 2 and the O-shaped conductor 3. In this way, the single coil 4 with the O-shaped conductor 3 added has kinds of stacking methods.

[0109] However, setting the outwardly deflected leg Ⅲ in the first type of U-shaped conductor 1 and the outwardly deflected leg Ⅲ in the second type of U-shaped conductor 2 as adjacent two-layer conductors can make the legs Ⅲ on the two connected single coils 4 adjacent without using a jumper conductor. Therefore, in specific implementation, the following structure is usually adopted:

[0110] For the convenience of description, the leg portions Ⅰ at the same slot position are divided into the first-layer conductor, the second-layer conductor... the A-layer conductor from the outside to the inside in the radial direction. A is an even number greater than 4; when the leg portion Ⅰ where the outwardly deflected leg Ⅲ of the first type of U-shaped conductor 1 is located and the leg portion Ⅰ where the inwardly deflected leg Ⅲ is located are respectively the first-layer conductor and the A-layer conductor in their respective slot positions, the leg portion Ⅰ where the outwardly deflected leg Ⅲ of the second type of U-shaped conductor 2 is located and the leg portion Ⅰ where the inwardly deflected leg Ⅲ is located are respectively the second-layer conductor and the third-layer conductor in their respective slot positions, and the leg portions Ⅰ of the O-shaped conductor 3 are respectively the 2n-layer conductor and the 2n + 1-layer conductor in their respective slot positions, 2 ≤ n ≤ A / 2 - 1. When the leg portion Ⅰ where the outwardly deflected leg Ⅲ of the first type of U-shaped conductor 1 is located and the leg portion Ⅰ where the inwardly deflected leg Ⅲ is located are respectively the A-layer conductor and the first-layer conductor in their respective slot positions, the leg portion Ⅰ where the outwardly deflected leg Ⅲ of the second type of U-shaped conductor 2 is located and the leg portion Ⅰ where the inwardly deflected leg Ⅲ is located are respectively the A - 1-layer conductor and the A - 2-layer conductor in their respective slot positions, and the leg portions Ⅰ of the O-shaped conductor 3 are respectively the A - 2n-layer conductor and the A - 2n + 1-layer conductor in their respective slot positions, 2 ≤ n ≤ A / 2 - 1.

[0111] In this embodiment, the single coil 4 is arranged on the basis of a first basic arrangement method using one first type of U-shaped conductor 1, one second type of U-shaped conductor 2, and two O-shaped conductors 3. Specifically, the outwardly deflected leg III of the first type of U-shaped conductor 1 is the first-layer conductor L1 and extends clockwise; the outwardly deflected leg III of the second type of U-shaped conductor 2 is the second-layer conductor L2 and extends counterclockwise, and the inwardly deflected leg III of the second type of U-shaped conductor 2 is the third-layer conductor L3; the front leg III of the first O-shaped conductor 3 adjacent to the second type of U-shaped conductor 2 is the fourth-layer conductor L4 and is connected to the leg III of the third-layer conductor, and its rear leg III is the fifth-layer conductor L5; the front leg III of the second O-shaped conductor 3 adjacent to the second type of U-shaped conductor 2 is the sixth-layer conductor L6 and is connected to the leg III of the fifth-layer conductor, and its rear leg III is the seventh-layer conductor L7; the inwardly deflected leg III of the first type of U-shaped conductor 1 is the eighth-layer conductor L8 and is connected to the leg III of the seventh-layer conductor. Among them Figure 17 and Figure 18 respectively show the conductor layer arrangement of the single coil 4 when viewed from the front (connection side) and the back (insertion side).

[0112] In this embodiment, the number of pole pairs P = 4, the number of slots per pole per phase Q = 2, the number of slots in the stator core Z = 48 slots, the number of conductors per slot A = 4, the pitch Y = 6, and the number of parallel branches R = 2.

[0113] As Figures 19 - 21 shown, another difference in this embodiment from Embodiment 1 is that on two branches connected in parallel on the same phase winding, the connection end of the single-foot conductor 1-b2 for connecting the power supply on the single coil 4 of one branch is directly connected to the connection end of the single-foot conductor 1-a3 for connecting the power supply on the single coil 4 of the other branch to form an integrally formed large-span hairpin conductor, which is then welded to the power supply lead conductor 6.

[0114] In this embodiment, it is a three-phase stator winding. Therefore, 3 of the two-branch phase windings are arranged in the circumferential direction of the stator to form a three-phase stator winding. Finally, a star connection conductor 7 connecting the 3 phase windings is provided at the connection end of each phase winding to achieve the star connection of the three-phase windings, as Figure 22 shown.

[0115] Embodiment 3: 4 wires in one branch, the number of slots per pole per phase Q = 2

[0116] In this embodiment, the number of pole pairs P of the stator is 4, the number of slots per pole per phase Q is 2, the number of slots in the stator core Z is 48 slots, the number of conductors per slot A is 4, the pitch Y is 6, and the number of parallel branches R is 1.

[0117] The phase winding includes a branch, and the branch includes two series-connected coil loop groups. Each coil loop group is formed by connecting Q coil loops located on Q circumferentially adjacent slots of the stator in the assembled state, where Q is the number of slots per pole per phase. In this embodiment, since Q = 2, that is, each coil loop group is formed by connecting 2 coil loops 5 located on 2 circumferentially adjacent slots of the stator in the assembled state. Moreover, the number of pole pairs P in this embodiment and Embodiment 1 is 4, so that the coil loop 5 is formed by sequentially connecting 4 monomer coils 4 along the circumferential direction of the stator core 8. That is, the connection structure of each coil loop group in this embodiment is exactly the same as the connection structure of each branch in Embodiment 1, as Figures 4 - 7 shown.

[0118] In this embodiment, as Figure 4 and Figure 5 shown, in each coil loop group, in the direction of looking at the insertion side head-on, in the clockwise direction, the pitch of the first type of U-shaped conductor 1-c on the last monomer coil of the previous coil loop is Y + 1, that is, its leg part deviates outward by one slot in the clockwise direction. In this way, the legs of the first type of U-shaped conductor 1 with a pitch of Y + 1 are located in the same slot as the legs (the starting legs of the latter coil loop) connected in series with it on the latter coil loop, which is convenient for direct welding connection. And in the clockwise direction, the pitch of the first type of U-shaped conductor (replaced by a single-leg conductor 1-b2 and a single-leg conductor 1-b3) on the last monomer coil of the last coil loop is Y - 1, that is, its leg part deviates inward by one slot in the clockwise direction, just occupying the slot vacated after the first type of U-shaped conductor on the last monomer coil of the previous coil loop deviates outward by one slot, realizing the position swapping. The pitches of all other first type of U-shaped conductors 1 and second type of U-shaped conductors 2 are Y.

[0119] In this embodiment, as Figure 6 shown, the first type of U-shaped conductor 1-a1 on a monomer coil 4 on one branch is a single-leg conductor 1-a2 and a single-leg conductor 1-a3 correspondingly arranged at the position of its leg part, as Figure 23 shown. One end of the single-leg conductor 1-a2 and the single-leg conductor 1-a3 is a leg matching the monomer coil where they are located, and the other end is a connection end for connecting another coil loop group or star point or power supply.

[0120] As Figure 7 shown, the first type of U-shaped conductor 1-b1 on a monomer coil 4 on the other branch is a single-leg conductor 1-b2 and a single-leg conductor 1-b3 correspondingly arranged at the position of its leg part, as Figure 24As shown, one end of the single-leg conductor 1-b2 and the single-leg conductor 1-b3 is a leg matching the single coil in the monomer coil, and the other end is a connection end for connecting another coil ring group or star point or power supply.

[0121] As Figure 25 and Figure 26 As shown, on two coil ring groups connected in series on the same branch, the single-leg conductor 1-b2 for series connection on the monomer coil 4 of one coil ring group is directly connected to the single-leg conductor 1-a3 for series connection on the monomer coil 4 of another branch to form an integrally formed large-span hairpin conductor.

[0122] In two mutually connected coil rings, the output leg of the previous coil ring in the current direction and the input leg of the subsequent coil ring are arranged side by side in the radial direction of the phase winding. Without using a jumper conductor, the two can be directly welded in series. Since the connection legs inside each coil ring are adjacent to each other in the same slot, with the above structure, the legs of the entire phase winding can be welded together without using a jumper conductor, greatly reducing the overall assembly difficulty and welding difficulty of the motor, and being conducive to improving the assembly quality and assembly efficiency.

[0123] In this embodiment, it is a three-phase stator winding. Therefore, 3 such phase windings are arranged in the circumferential direction of the stator to form a three-phase stator winding. Finally, a star connection conductor 7 connecting the 3 phase windings is provided at the connection end of each phase winding to achieve the star connection of the three-phase windings, as Figure 27 shown.

[0124] Embodiment 4: 4 wires and 4 branches, number of slots per pole per phase Q = 2

[0125] In this embodiment, the number of pole pairs P of the stator is 4, the number of slots per pole per phase Q is 2, the number of slots Z of the stator core is 48 slots, the number of conductors A per slot is 4, the pitch Y is 6, and the number of parallel branches R is 4.

[0126] The difference from Embodiment 1 is that the phase winding includes four branches connected in parallel. Each branch includes a coil ring, and the coil ring is formed by sequentially connecting P monomer coils, where P is the number of pole pairs of the phase winding and is an even number. In this embodiment, P = 4; each coil ring has a pair of first-type or second-type U-shaped conductors with a pitch of Y + 1 and first-type or second-type U-shaped conductors with a pitch of Y - 1 arranged at radially opposite positions, and the pitch of all other conductors is Y; the first-type or second-type U-shaped conductors with a pitch of Y + 1 on one branch and the first-type or second-type U-shaped conductors with a pitch of Y - 1 on another branch in the circumferentially adjacent slot are located in circumferentially adjacent slots.

[0127] In this embodiment, asFigures 28 - 30 As shown, among which, Figure 30 The coil loops represented by solid lines in are Figure 28 The coil loops in, and the coil loops represented by dashed lines are Figure 29 The coil loops in Figure 28 , Figure 29 and Figure 30 have exactly the same perspective.

[0128] From Figure 28 the circular parts at A-1 and A-2 of, it can be seen that the two are located at two positions opposite to each other in the radial direction. A first type of partially U-shaped conductor 1 with a pitch of Y-1 is arranged at the circular part of A-1, so that its supporting leg part deflects inward by one slot position, that is, the supporting leg part I where the outwardly deflecting and turning leg III of the first type of partially U-shaped conductor 1 with a pitch of Y-1 is located deflects inward by one slot position relative to the second type of partially U-shaped conductor 2 in its single coil 4. And a first type of partially U-shaped conductor 1 with a pitch of Y+1 is arranged at the circular part of A-2, so that its supporting leg part deflects outward by one slot position, that is, the supporting leg part I where the outwardly deflecting and turning leg III of the first type of partially U-shaped conductor 1 with a pitch of Y+1 is located deflects outward by one slot position relative to the second type of partially U-shaped conductor 2 in its single coil 4.

[0129] Similarly, in Figure 29 from the circular parts at B-1 and B-2 of, it can be seen that the two are located at two positions opposite to each other in the radial direction, where B-1 corresponds to the position of A-1 in Figure 4 , and the single coils where they are located are in circumferentially adjacent slots; and B-2 Figure 4 corresponds to the position of B-2 in, and the single coils where they are located are also in circumferentially adjacent slots. A first type of partially U-shaped conductor 1 with a pitch of Y+1 is arranged at the circular part of B-1, so that its supporting leg part deflects outward by one slot position, that is, the supporting leg part I where the outwardly deflecting and turning leg III of the first type of partially U-shaped conductor 1 with a pitch of Y+1 is located deflects outward by one slot position relative to the second type of partially U-shaped conductor 2 in its single coil 4. And a first type of partially U-shaped conductor 1 with a pitch of Y-1 is arranged at the circular part of B-2, so that its supporting leg part deflects inward by one slot position, that is, the supporting leg part I where the outwardly deflecting and turning leg III of the first type of partially U-shaped conductor 1 with a pitch of Y-1 is located deflects inward by one slot position relative to the second type of partially U-shaped conductor 2 in its single coil 4.

[0130] With the above structure, a pair of first-type partial U-shaped conductors 1 with a pitch of Y + 1 and a pair of first-type partial U-shaped conductors 1 with a pitch of Y - 1 are arranged in the radial direction of the two branches. Compared with the branches composed of the first-type partial U-shaped conductors 1 and the second-type partial U-shaped conductors 2 with all the same pitches, half of the single coils 4 on the branch can maintain their original positions, while the other half of the single coils 4 move one slot pitch clockwise or counterclockwise. And the single coils 4 on the same side and in adjacent slot positions on the two branches move one slot pitch in opposite directions, so that the positional relationship between the two single coils 4 in the adjacent slot positions on this side is swapped, and further the positional relationship between the single coils 4 on the two branches is arranged in an axisymmetric manner. Whether in the clockwise direction or the counterclockwise direction, half of the single coils 4 in the adjacent slot positions on the two branches differ by +360 / Z° mechanical angle, and the other half differ by -360 / Z° mechanical angle, thus avoiding the generation of potential difference between the two branches and forming a circulating current. At the same time, in this structure, the connected leg Ⅲ is located in the same slot, and there is no need to use a jumper conductor, and the two can be directly welded together, reducing the use of useless copper, making the connection of the conductors simpler and facilitating manufacturing.

[0131] Further, the two single-foot conductors on the same single coil are combined into a lead conductor group. In the assembled state, the two branches located in the circumferentially adjacent slot positions of the stator are taken as a group. The single coils where the lead conductor groups are located on the two branches in the same group are located in two circumferentially adjacent slot positions of the phase winding where they are located; the single coils where the lead conductor groups are located on the two branches in the same group are arranged adjacent to each other in the circumferential direction of the phase winding where they are located and the single coils where the lead conductor groups are located on the two branches in the other group.

[0132] In this way, the distances between the power connection ends and between the star connection ends in the four lead conductor groups can be made closer, thereby shortening the jumper conductors used to connect the power connection ends and the star connection ends, and reducing the use of useless copper.

[0133] In this embodiment, the first-type partial U-shaped conductors 1 on a single coil 4 on each branch are two single-foot conductors correspondingly arranged at the positions where their legs are located. As Figures 31 - 34 shown, one end of the single-foot conductor is a leg matching the single coil where it is located, and the other end is a connection end for connecting the star point or the power supply.

[0134] As Figure 35 and Figure 36As shown in the figure, on the four branches connected in parallel, the single-foot conductors for connecting the power supply and the single-foot conductors for connecting the power supply are welded together and welded to the power supply lead conductor 6. At the same time, the two single-foot conductors on the same monomer coil are combined into a lead conductor group. In the assembled state, two branches located in adjacent slots in the circumferential direction of the stator are taken as a group. The monomer coils where the lead conductor groups on the two branches in the same group are located are in two adjacent slots in the circumferential direction on the phase winding where they are located; the monomer coils where the lead conductor groups on the two branches in the same group are located and the monomer coils where the lead conductor groups on the two branches in the other group are located are arranged adjacent to each other in the circumferential direction of the phase winding where they are located.

[0135] In this embodiment, it is a three-phase stator winding. Therefore, 3 such phase windings are arranged in the circumferential direction of the stator to form a three-phase stator winding, as Figure 37 shown. Finally, a star connection conductor 7 connecting the 3 phase windings is provided at the connection end of each phase winding to realize the star connection of the three-phase windings.

[0136] Embodiment 5: 6 wires and two branches, number of slots per pole per phase Q = 3

[0137] As Figures 38 - 42 shown, a motor includes a stator. The stator includes a stator core and three-phase phase windings installed on the stator core. One ends of the branches on all the phase windings are connected to each other through a star connection conductor, and the other ends of the two parallel branches on each phase winding are connected in parallel through a power supply lead conductor, as Figures 38 - 40 shown.

[0138] Embodiment 5 is similar to Embodiment 2. Both adopt two-branch phase windings, and the monomer coil 4 includes an annular O-shaped conductor 3. The main difference from Embodiment 2 is that:

[0139] As Figure 41 shown, each branch includes 3 coil rings located on 3 continuously adjacent slots in the circumferential direction of the stator in the assembled state. In the same coil ring group, two coil rings located in adjacent slots are connected to each other, and the pitch of the hairpin conductor on the last monomer coil of the coil ring located in the front in the clockwise or counterclockwise direction is Y + 1, so that the leg at the end of the hairpin conductor with a pitch of Y + 1 and the leg connected to it on the latter coil ring are arranged side by side in the radial direction of the phase winding; the pitch of the hairpin conductor on the last monomer coil of the coil ring located at the end in the clockwise or counterclockwise direction is Y - 2, and the pitch of all other hairpin conductors is Y.

[0140] In this embodiment, as Figure 42 shown, the O-shaped conductor on one monomer coil in each branch is two single-foot conductors correspondingly arranged at the positions where its leg parts are located.

[0141] Embodiment 6: 4 wires and two branches, number of slots per pole per phase Q = 1

[0142] As Figures 43 - 46 shown, a motor includes a stator, the stator includes a stator core and three-phase phase windings mounted on the stator core. One ends of each branch on all the phase windings are interconnected through a neutral point connecting conductor, and the other ends of two parallel branches on each phase winding are connected in parallel through a power supply lead-out conductor, as Figure 43 shown.

[0143] As Figure 44 shown, in the same phase winding, the connection ends of two single-foot conductors for connecting the power supply in two mutually parallel coil loop groups are large-span hairpin conductors integrally bent and formed at positions corresponding to the leg parts of the two, as Figure 45 shown.

[0144] During specific implementation, Figure 43 the neutral point connecting conductor and the single-foot conductor connected thereto are an integrally formed integral hairpin structure, as Figure 46 shown.

[0145] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A phase winding, characterized in that, It includes at least one branch, each branch is formed by connecting at least one coil ring, and the coil ring includes P single coils connected in sequence, where P is the number of pole pairs; The single coil comprises at least two hairpin conductors, the hairpin conductors comprising a hairpin body bent in a U-shape as a whole, the hairpin body comprising two legs arranged in parallel with each other and a head connected to one end of the two legs, and the other end of each of the two legs is provided with a foot; the hairpin conductors on the same single coil are connected in series in sequence to form a single coil in a ring shape as a whole, and the single coil has two feet bent in opposite directions in the width direction; A hairpin conductor on at least one single coil in the branch circuit is two single-leg conductors arranged correspondingly at the position of its leg portion, one end of the single-leg conductor is a leg, and the leg is consistent with the corresponding leg of the hairpin conductor at the corresponding position, and the other end is a connecting end; the hairpin conductor includes a first type of U-shaped conductor and a second type of U-shaped conductor whose two legs are bent toward the same side in the width direction of the hairpin body, the first type of U-shaped conductor and the second type of U-shaped conductor are arranged side by side in the thickness direction of the hairpin body, and the legs of the first type of U-shaped conductor are bent toward the same side in the width direction of the hairpin body. The legs of the first and second U-shaped conductors are arranged in an opposite direction to the legs of the second U-shaped conductors, so that the legs of the first and second U-shaped conductors that are bent outward and outward are separated from each other, and the legs of the first and second U-shaped conductors that are bent toward the middle are connected to form the single coil; the two legs of the first and second U-shaped conductors are staggered in the thickness direction of the hairpin bodies, and the second U-shaped conductors are staggered in the thickness direction of the hairpin bodies. The stator is located between the two legs of the first-type U-shaped conductor in the thickness direction, and the head of the second-type U-shaped conductor is covered in the head of the first-type U-shaped conductor; in the assembled state, the legs located at the same slot in the stator are divided into a first-layer conductor, a second-layer conductor, a third-layer conductor and a fourth-layer conductor from the outside to the inside in the radial direction; the two legs of the first-type U-shaped conductor are respectively the first-layer conductor and the fourth-layer conductor of the slot where they are located, and the two legs of the second-type U-shaped conductor are respectively the second-layer conductor and the third-layer conductor of the slot where they are located; The hairpin conductor also includes an O-shaped conductor that is annular as a whole, and the two legs of the O-shaped conductor are bent toward the middle in the width direction of the hairpin body, and are staggered and spaced in the thickness direction of the hairpin body; the O-shaped conductor is stacked with the second type of U-shaped conductor in the thickness direction of the first type of U-shaped conductor, forming a single coil in which the two legs of the O-shaped conductor are respectively connected to other adjacent legs in the thickness direction, and the legs of the first type of U-shaped conductor that are bent outwards and the legs of the second type of U-shaped conductor that are bent outwards are away from each other.

2. The phase winding according to claim 1, wherein, The phase winding includes one branch or two branches arranged in parallel. In the same phase winding, Q coil rings located on Q slot positions that are circumferentially continuously adjacent to each other in the assembled state are sequentially connected in series to form a coil ring group, where Q is the number of slots per pole per phase and is an integer. For two monomer coils connected to each other in the two coil ring groups in the same phase winding, each has a hairpin conductor, and two single-leg conductors are correspondingly arranged at the positions of their leg parts. One end of the single-leg conductor is a leg, and this leg is consistent with the corresponding leg of the hairpin conductor at the corresponding position, and the other end is a connection end.

3. The phase winding according to claim 2, wherein, Two single-leg conductors on the same monomer coil are combined into a lead conductor group, and the monomer coils where the lead conductor groups are located on the two coil ring groups in the same phase winding are arranged adjacent to each other in the circumferential direction of the phase winding.

4. The phase winding according to claim 3, characterized in that, The two coil ring groups in the same phase winding are connected in series to form one branch or in parallel to form two branches. In two coil ring groups connected in series, the connection ends of the two single-leg conductors used for series connection are welded together, or the two single-leg conductors used for series connection in two coil ring groups connected in series are large-span hairpin conductors integrally bent and formed at the positions of their leg parts. In two coil ring groups connected in parallel, the connection ends of the two single-leg conductors used for connecting to the power supply are welded together, or the two single-leg conductors used for connecting to the power supply in two coil ring groups connected in parallel are large-span hairpin conductors integrally bent and formed at the positions of their leg parts.

5. The phase winding according to claim 2, wherein Each coil ring group includes Q coil rings located on Q slot positions that are circumferentially continuously adjacent to each other in the assembled state, where Q is the number of slots per pole per phase and is an integer greater than 1. In the same coil ring group, two coil rings located on adjacent slot positions are connected to each other, and the pitch of the hairpin conductor on the last monomer coil of the coil ring located in the front in the clockwise or counterclockwise direction is Y + 1, so that the leg at the end of the hairpin conductor with a pitch of Y + 1 is arranged side by side in the radial direction of the phase winding with the leg connected to it on the latter coil ring. The pitch of the hairpin conductor on the last monomer coil of the coil ring located last in the clockwise or counterclockwise direction is Y - Q + 1, and the pitch of all other hairpin conductors is Y.

6. The phase winding according to claim 1, wherein The phase winding includes four branches arranged in parallel. Each branch includes a coil ring, and the coil ring is formed by sequentially connecting P monomer coils, where P is the number of pole pairs and is an even number. Each coil ring has at least one pair of hairpin conductors with a pitch of Y + 1 and hairpin conductors with a pitch of Y - 1. The hairpin conductors with a pitch of Y + 1 and the hairpin conductors with a pitch of Y - 1 are circumferentially evenly distributed, and the pitch of all other hairpin conductors is Y. The legs of the hairpin conductors with a pitch of Y + 1 and the hairpin conductors with a pitch of Y - 1 have the same deflection direction in the circumferential direction of the coil ring. The hairpin conductors with a pitch of Y + 1 on one branch and the hairpin conductors with a pitch of Y - 1 on another branch in a circumferentially adjacent slot are located in circumferentially adjacent slots.

7. The phase winding according to claim 6, characterized in that, Two single-foot conductors on the same monomer coil are combined into a lead conductor group. Two branches located in circumferentially adjacent slots of the stator in the assembled state form a group. The monomer coils where the lead conductor groups on the two branches in the same group are located are in two circumferentially adjacent slots of the phase winding where they are located, and the monomer coils where the lead conductor groups on the two branches in one group are adjacent to the monomer coils where the lead conductor groups on the two branches in the other group in the circumferential direction of the phase winding where they are located.

8. The phase winding according to claim 1, wherein The deflection directions and pitches of the legs of the hairpin conductors corresponding to the single-foot conductors on each branch are equal.

9. The phase winding according to claim 1, characterized in that, The two leg portions of the first type of U-shaped conductor and the second type of U-shaped conductor are arranged in a staggered manner in the thickness direction of their hairpin bodies. The second type of U-shaped conductor is located between the two leg portions of the first type of U-shaped conductor in the thickness direction of the first type of U-shaped conductor, and the head of the second type of U-shaped conductor is wrapped inside the head of the first type of U-shaped conductor; the O-shaped conductor is located between the two leg portions of the first type of U-shaped conductor in the thickness direction of the first type of U-shaped conductor and is arranged in a stacked manner with the second type of U-shaped conductor; the leg portions located at the same slot position on the stator are radially divided into the first layer conductor, the second layer conductor... the A-layer conductor from the outside to the inside, where A is an even number greater than 4; the two leg portions of the first type of U-shaped conductor are respectively the first layer conductor and the A-layer conductor of their respective slots, the two leg portions of the second type of U-shaped conductor are respectively the second layer conductor and the third layer conductor or the (A - 1)-layer conductor and the (A - 2)-layer conductor of their respective slots, and the leg portions of the O-shaped conductor are respectively the 2n-layer conductor and the 2n + 1-layer conductor or the A - 2n-layer conductor and the A - 2n + 1-layer conductor of their respective slots, where 2 ≤ n ≤ A / 2 - 1.

10. A stator, characterized in that, It includes a stator core and a multi-phase phase winding installed on the stator core as described in any one of claims 1 - 2, 4 - 6, 8 - 9. Power terminals are respectively connected to the connection ends for connecting the power supply on the multi-phase phase windings. The connection ends for connecting the star point on the multi-phase phase windings are welded together through star point connection conductors, or the hairpin conductors where all or part of the connection ends for connecting the star point on the multi-phase phase windings are located are connected in an integrally preformed structure.

11. A motor, characterized in that, It includes a stator as described in claim 10.

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