Two-branch phase winding, stator and motor

Abstract

The present invention discloses a two-branch phase winding, a stator and a motor, wherein the two-branch phase winding includes a coil group formed by connecting a combination coil, wherein the combination coil includes a first type of U-shaped conductor and a second type of U-shaped conductor that overlap each other and deflect and bend in opposite directions, and each branch includes two coil groups arranged on circumferentially adjacent slots, wherein a first type of U-shaped conductor with a pitch of Y+1 and a first type of U-shaped conductor with a pitch of Y‑1 are respectively arranged in the two coil groups, and the pitches of all other first type of U-shaped conductors and second type of U-shaped conductors are Y; the first type of U-shaped conductor with a pitch of Y+1 and the first type of U-shaped conductor with a pitch of Y‑1 are located in circumferentially adjacent slots. The two-branch phase winding, the stator and the motor of the present invention all have the advantages of ingenious structural design, short circuit jump distance, which is conducive to reducing jumper conductors and reducing the amount of useless copper, convenient winding wiring, which is conducive to reducing production difficulty and circulating current influence.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a two-branch 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 mechanical energy into electrical energy) based on the principle of electromagnetic induction. It can be used as a power source or power generation device for various electrical appliances such as household appliances, various machines such as electric vehicles and electric vehicles. Motors can be divided into DC motors and AC motors according to the type of their working power supply, and AC motors can be divided into single-phase motors and multi-phase motors (such as three-phase motors, etc.). The motor includes a stator and a rotor, and windings are arranged in the stator core slots of the stator.

[0003] There are two types of motor windings available: wave winding and stacked winding. For segmented hairpin winding motors that use flat copper wire or rectangular cross-section copper wire, stacked windings will result in too many jumper conductors between stacked coils, increasing the amount of ineffective copper used. Therefore, this type of motor usually uses wave windings.

[0004] However, this type of motor still has defects in the prior art, such as long circuit jump distance, large amount of ineffective copper, difficult winding wiring design, and disadvantageous serial design. For example, the segmented hairpin winding disclosed in Chinese patent CN101490933B has a longest jump conductor of 6 slot spans for each phase winding, a star point connection conductor of 16 slot spans, and 8 slot spans between the three-phase power lead wires. For another example, a motor stator disclosed in Chinese patent CN103650296B adopts the form of circuit jumper and power lead-out on the welding side, and its jump conductor exceeds 8 slot spans, and the star point connection conductor exceeds 12 slot spans. For another example, a motor stator disclosed in Chinese patent CN10339834B has a longest jump conductor of more than 9 slot spans, and a star point connection conductor of more than 12 slot spans. Among them, in the two-branch phase winding, since each branch needs to connect two coil groups in series, and the connection ends of the two coil groups are located at the phase-displaced slots, a jumper conductor is required for connection, which makes manufacturing difficult. Moreover, in order to improve the efficiency of the motor, it is necessary to reduce or eliminate the influence of the circulating current in the phase winding. Therefore, it is necessary to solve the problem of the difficulty of manufacturing the jumper conductor while also solving the problem of the circulating current of the two-branch phase winding. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a two-branch phase winding, stator and motor with an ingenious structural design, a short circuit jump distance, which is conducive to reducing jumper conductors, reducing the amount of useless copper, and convenient winding wiring, which is conducive to reducing production difficulty and circulating current influence.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A two-branch phase winding, characterized in that it includes a coil group for installation in a stator core slot, the coil group is formed by sequentially connecting M combined coils, M is equal to the number of magnetic poles of the phase winding, the combined coil includes a first type of U-shaped conductor and a second type of U-shaped conductor, the first type of U-shaped conductor and the second type of U-shaped conductor both include a hairpin body that is bent in a U shape as a whole, the hairpin body includes two leg portions arranged in parallel with each other and a head connected to one end of the two leg portions, the other end of the two leg portions are each provided with a foot, and the two feet located on the same hairpin body are connected to the hairpin The projections of the first-type U-shaped conductor and the second-type U-shaped conductor in the thickness direction of the hairpin body overlap each other, and the legs of the first-type U-shaped conductor and the legs of the second-type U-shaped conductor are in opposite directions of deflection and bending, so that the legs of the first-type U-shaped conductor that deflect and bend outward and the legs of the second-type U-shaped conductor that deflect and bend outward are separated from each other, and the legs of the first-type U-shaped conductor that deflect and bend toward the middle and the legs of the second-type U-shaped conductor that deflect and bend toward the middle are close to and connected to form the combined coil;

[0008] Each branch includes two coil groups which are arranged on circumferentially adjacent slots and connected in series, wherein a first type of U-shaped conductor with a pitch of Y+1 and a first type of U-shaped conductor with a pitch of Y-1 are respectively arranged in the two coil groups, and the pitches of all other first type of U-shaped conductors and second type of U-shaped conductors are Y; the first type of U-shaped conductor with a pitch of Y+1 on one coil group and the first type of U-shaped conductor with a pitch of Y-1 on the other coil group are located in circumferentially adjacent slots, the leg portion of the first type of U-shaped conductor with a pitch of Y+1 where the outwardly deflected and bent leg is located is deviated outward by one slot relative to the combined coil where it is located, and the leg portion of the first type of U-shaped conductor with a pitch of Y-1 where the outwardly deflected and bent leg is located is deviated inward by one slot relative to the combined coil where it is located.

[0009] With the above structure, since the two coil groups connected in series on each branch are arranged on circumferentially adjacent slots, that is, the shapes of the two coil groups and the current directions in the combined coils in the two coil groups are consistent, the mechanical angle of the two coil groups is 360 / Z°, where Z is the total number of slots. Since the current directions of the two coil groups on each branch are consistent, the current directions of the two branches are bound to be completely opposite, so that the phase difference between the two branches is 180°, thereby avoiding the potential difference between the two branches to form a circulating current, thereby improving the efficiency of the motor. In addition, the first type of U-shaped conductor with a pitch of Y+1 on one coil group and the first type of U-shaped conductor with a pitch of Y-1 on another coil group are located in circumferentially adjacent slots, so that the mechanical angle occupied by one coil group as a whole is (360+360 / Z)°, while the mechanical angle occupied by the other coil group as a whole is (360-360 / Z)°, so that in the two coil groups connected in series, the output end of the previous coil group in the current direction and the input end of the next coil group are located in the same slot, so there is no need to use a jumper conductor, and the two can be directly welded in series, making the connection of the conductors simpler and easier to manufacture; at the same time, the output end of the next coil group in the current direction and the input end of the previous coil group are located in the same slot; in this way, the overall appearance structure of the winding is the same as before the improvement, and the jumper conductor between the combined coil and the coil group can be omitted, further reducing the use of useless copper, and between multi-phase windings, only star point connection conductors are needed for connection, the structure is simpler, the use of useless copper is less, and the power lead conductors are more concentrated. In addition, for stators of the same series with the same stator core size, this setting method can ensure that the jumper positions of the phase windings are concentrated on the same terminal even if the number of pole pairs and the number of conductors per slot change, further ensuring the centralized arrangement of the star point connection conductors and the power lead conductors, avoiding mutual entanglement between the wiring and ensuring simplicity, which is conducive to the realization of serial design of the stators.

[0010] Furthermore, 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.

[0011] This structure can make the conductor layout on the insertion side of the stator core slot simpler, neater, more reasonable and less space-consuming.

[0012] Furthermore, the combination coil also includes an O-shaped conductor that is annular as a whole, and the O-shaped conductor includes a hairpin body that is bent in a U shape as a whole. The hairpin body includes 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, and the two feet are deflected and 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 located between the two legs of the first type of U-shaped conductor in the thickness direction of the first type of U-shaped conductor, and is stacked with the second type of U-shaped conductor to form the combination coil in which the two feet of the O-shaped conductor are respectively connected to other adjacent feet in the thickness direction, and the feet of the first type of U-shaped conductor that are deflected and bent outward and the feet of the second type of U-shaped conductor that are deflected and bent outward are away from each other.

[0013] Furthermore, the leg portions located at the same slot are divided into a first layer conductor, a second layer conductor, a third layer conductor and a fourth layer conductor from outside to inside in the radial direction; the two leg portions of the first-type U-shaped conductor are respectively the first layer conductor and the fourth layer conductor of the respective slots, and the two leg portions of the second-type U-shaped conductor are respectively the second layer conductor and the third layer conductor of the respective slots.

[0014] Furthermore, the leg portions located at the same slot are divided into a first layer conductor, a second layer conductor...Ath layer conductor from outside to inside in the radial direction, where A is an even number greater than 4; the two leg portions of the first-type U-shaped conductor are respectively the first layer conductor and the Ath layer conductor of the respective slots, the two leg portions of the second-type U-shaped conductor are respectively the second layer conductor and the third layer conductor or the (A-1)th layer conductor and the (A-2)th layer conductor of the respective slots, and the leg portions of the O-shaped conductor are respectively the 2nth layer conductor and the 2n+1th layer conductor or the A-2nth layer conductor and the A-2n+1th layer conductor of the respective slots, 2≦n≦A / 2-1.

[0015] Furthermore, the legs of the first type of U-shaped conductor and the second type of U-shaped conductor both have connecting legs arranged parallel to the leg portions, and the two connected connecting legs are arranged adjacent to each other in the radial direction; the head of the first type of U-shaped conductor and the second type of U-shaped conductor is a V-shape or an arc with a top, and the two sides of the head and the two leg portions are radially staggered front and back from the top of the V-shape or the arc; the first type of U-shaped conductor and the second type of U-shaped conductor are both formed by bending flat copper wire or rectangular cross-section copper wire.

[0016] Furthermore, the legs of the first type of U-shaped conductor, the second type of U-shaped conductor and the O-shaped conductor all have connecting legs arranged parallel to the leg parts, and the two connected connecting legs are arranged adjacent to each other in the radial direction; the head of the first type of U-shaped conductor, the second type of U-shaped conductor and the O-shaped conductor is a V-shape or an arc with a top, and the two sides of the head and the two legs are staggered radially front and back from the top of the V-shape or the arc; the first type of U-shaped conductor, the second type of U-shaped conductor and the O-shaped conductor are all formed by bending flat copper wire or rectangular cross-section copper wire.

[0017] Furthermore, on any branch line, a group of two legs adjacent to each other in the radial direction are legs for connecting to a power lead-out line and legs for connecting to a star point line.

[0018] A stator, characterized in that it comprises a stator core and two-branch phase windings as described above which are installed on the stator core for three phases, wherein one end of the two-branch phase windings for three phases are respectively connected to a power lead conductor, and the other ends are connected to each other through a star point connection conductor.

[0019] A motor, characterized by comprising the stator as described above.

[0020] In summary, the two-branch phase windings, stator and motor of the present invention have the advantages of ingenious structural design, short circuit jump distance, which is beneficial to reducing jumper conductors and reducing the amount of useless copper, convenient winding wiring, which is beneficial to reducing production difficulty and circulating current impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the first type of U-shaped conductor.

[0022] Figure 2 It is a schematic diagram of the structure of the second type of U-shaped conductor.

[0023] Figure 3 Schematic diagram of the structure of the combined coil in Example 1.

[0024] Figure 4 Schematic diagram of the structure of a coil group having a first type of U-shaped conductor with a pitch of Y+1 in Example 1.

[0025] Figure 5 Schematic diagram of the structure of a coil group having a first type of U-shaped conductor with a pitch of Y-1 in Example 1.

[0026] Figure 6 for Figure 4 and Figure 5 Schematic diagram of the combined structure of the coil group (solid line is Figure 4 The coil group, the dotted line is Figure 5 coil assembly).

[0027] Figure 7 for Figure 6 Schematic diagram of the enlarged structure of part C.

[0028] Figure 8 Schematic diagram of the structure of the phase winding in Example 1.

[0029] Fig. 9 This is a schematic diagram of the connection structure of a phase power lead conductor in the phase winding in Example 1.

[0030] Fig.10 for Fig. 9 Schematic diagram of the enlarged structure of part D.

[0031] Fig.11 This is a schematic diagram of the connection structure of the three-phase power lead-out conductors and the star point connection conductors in the phase winding in Example 1.

[0032] Fig.12 for Fig.11 Schematic diagram of the enlarged structure of part E in the middle.

[0033] Fig.13 This is a schematic diagram of the structure of the stator in Example 1.

[0034] Fig.14 Layout diagram of conductor layers of the combined coil in the stator core slot in Example 1 (connection side).

[0035] Fig.15 Layout diagram of conductor layers of the combined coil in the stator core slot in Example 1 (insertion side).

[0036] Fig.16 It is a schematic diagram of the structure of an O-shaped conductor.

[0037] Fig.17 Schematic diagram of the structure of the combined coil in Example 2.

[0038] Fig.18 Schematic diagram of the structure of a coil group having a first type of U-shaped conductor with a pitch of Y+1 in Example 2.

[0039] Fig.19 Schematic diagram of the structure of a coil group having a first type of U-shaped conductor with a pitch of Y-1 in Example 2.

[0040] Fig. 20 for Fig.18 and Fig.19 Schematic diagram of the combined structure of the coil group (solid line is Fig.16 The coil group, the dotted line is Fig.17 coil assembly).

[0041] Fig.21 for Fig. 20 Schematic diagram of the enlarged structure of part F.

[0042] Fig. 22 This is a schematic diagram of the structure of the phase winding in Example 2.

[0043] Fig.23 This is a schematic diagram of the connection structure of a phase power lead conductor in the phase winding in Example 2.

[0044] Fig.24 for Fig.23 Schematic diagram of the enlarged structure of part G in the middle.

[0045] Fig.25 This is a schematic diagram of the connection structure of the three-phase power lead-out conductors and the star point connection conductors in the phase winding in Example 2.

[0046] Fig.26 for Fig.25 Schematic diagram of the enlarged structure of part H in the middle.

[0047] Fig. 27 This is a schematic diagram of the structure of the stator in Example 2.

[0048] Fig.28 for Fig. 27 Schematic diagram of the structure from another angle.

[0049] Fig.29 Layout diagram of conductor layers of the combined coil in the stator core slots in Example 2 (connection side).

[0050] Fig.30 Layout diagram of conductor layers of the combined coil in the stator core slot in Example 2 (insertion side). DETAILED DESCRIPTION

[0051] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0052] Example 1 (such as Figure 1 to Figure 15 )

[0053] An electric machine, comprising a stator, such as Fig.13 As shown, the stator includes a stator core 8 and two-branch phase windings of three phases installed on the stator core 8, one end of the two parallel branches on each phase winding is connected to a power lead conductor 6, and the other end is connected to each other through a star point connection conductor 7.

[0054] like Fig.13 As shown, the stator core 8 includes a main body that is cylindrical as a whole. A plurality of stator core slots that are radially inwardly open are arranged in the inner ring of the stator core 8 along the circumferential direction. One end of the stator core slot is an insertion side, and the other end is a connection side. In this embodiment, as shown in FIG. Fig.13As shown, the upward end is the connection side, and the downward end is the insertion side. The three-phase two-branch phase winding is arranged in the stator core slot, and each phase of the two-branch phase winding includes two parallel branches, such as Figure 6 As shown, each parallel branch includes two coil groups 5 arranged in adjacent slots in the circumferential direction and connected in series. Figure 4 and Figure 5 As shown, each coil group 5 is formed by M combined coils 4 connected in sequence along the circumferential direction of the stator core 8, where M is equal to the number of magnetic pole pairs of the phase winding.

[0055] In this embodiment, if Figures 1 to 3 As shown, the combined coil 4 includes a first type of U-shaped conductor 1 (such as Figure 1 ) and the second type of U-shaped conductor 2 (such as Figure 2 ), 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, 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, the other end of each of the two leg parts I is provided with a foot III, and the two feet III located on the same hairpin body are bent toward the same side in the width direction of the hairpin body; the projections of the first type of U-shaped conductor 1 and the second type of U-shaped conductor 2 in the thickness direction of the hairpin body overlap each other, 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 of the first type of U-shaped conductor 1 that is bent outwards and the foot III of the second type of U-shaped conductor 2 that is bent outwards are separated from each other, and the foot III of the first type of U-shaped conductor 1 that is bent toward the middle and the foot III of the second type of U-shaped conductor 2 that is bent toward the middle are close to and connected to form the combined coil 4 (such as Figure 3 ).

[0056] like Figure 1 and Figure 2 As shown, the head II of the first type of U-shaped conductor 1 and the second type of U-shaped conductor 2 is a V-shape with a top, and the two sides of the head II and the two legs I are staggered front and back along the radial direction of the coil group from the top of the V-shape, that is, staggered front and back along the thickness direction of each hairpin body, and the second type of U-shaped conductor 2 is located between the two legs I of the first type of U-shaped conductor 1 in the thickness direction of the first type of U-shaped conductor 1, as shown in FIG. Figure 3 As shown, the head part II of the second type U-shaped conductor 2 is covered in the head part II of the first type U-shaped conductor 1.

[0057] In specific implementation, the head II can also be set to be arc-shaped. The first type of U-shaped conductor 1 and the second type of U-shaped conductor 2 are both formed by bending a rectangular cross-section copper wire.

[0058] In the two coil groups 5 on any branch, a first-type biased U-shaped conductor 1 with a pitch of Y+1 and a first-type biased U-shaped conductor 1 with a pitch of Y-1 are respectively provided, and the pitches of all other first-type biased U-shaped conductors 1 and second-type biased U-shaped conductors 2 are Y; the combined coil 4 where the first-type biased U-shaped conductor 1 with a pitch of Y+1 on one coil group 5 is located and the combined coil 4 where the first-type biased U-shaped conductor 1 with a pitch of Y-1 on another coil group 5 is located in circumferentially adjacent slots, such as Figures 4 to 6 As shown, Figure 6 The coil group represented by the solid line is Figure 4 The coil group in the figure is represented by the dotted line. Figure 5 The coil group in Figure 4 , Figure 5 and Figure 6 The perspective is completely consistent, from Figure 4 It can be seen from the circled parts at A-1 and A-2 that a first type U-shaped conductor 1 with a pitch of Y+1 is provided in the coil group 5, so that its leg portion is deviated outward by one slot, that is, the leg portion I where the leg III deviates outwardly on the first type U-shaped conductor 1 with a pitch of Y+1 is located is deviated outward by one slot relative to the second type U-shaped conductor 2 in the combined coil 4 where it is located. Figure 5 It can be seen from the circled parts at B-1 and B-2 in the figure that a first type U-shaped conductor 1 with a pitch of Y-1 is arranged in the coil group 5, so that its leg portion is deflected inwardly into a slot, that is, the leg portion I where the leg III deflected and bent outwardly on the first type U-shaped conductor 1 with a pitch of Y-1 is located is deflected inwardly into a slot relative to the second type U-shaped conductor 2 in the combined coil 4 where it is located.

[0059] When implementing it, Figure 6 As shown, on any branch, among the two coil groups 5 arranged on circumferentially adjacent slots, the coil group 5 located in the slot on the side of the deflection direction of the outwardly deflected leg III on the first-type U-shaped conductor 1 is provided with a first-type U-shaped conductor 1 with a pitch of Y-1, and the other coil group 5 is provided with a first-type U-shaped conductor 1 with a pitch of Y+1.

[0060] In this way, the leg portion I of the first type of U-shaped conductor 1 with a pitch of Y-1, where the leg III deviates outward and is bent, deviates inward by one slot, so that the leg of the first type of U-shaped conductor 1 with a pitch of Y-1 shrinks back by one slot, as shown in FIG. Figure 5 As shown, the leg portion I of the first type of U-shaped conductor 1 with a pitch of Y+1, where the leg III is bent outward, is deviated outward by one slot, so that the leg of the first type of U-shaped conductor 1 with a pitch of Y+1 extends outward by one slot, as shown in FIG. Figure 4 As shown, the leg III that needs to be connected in series with another coil group 5 is located in the same slot, such as Figure 6 and Figure 7 As shown, there is no need to set up an additional jumper conductor, and the two can be welded together, reducing the amount of ineffective copper. In addition, since the two coil groups 5 connected in series on each branch are set in circumferentially adjacent slots, that is, the shapes of the two coil groups 5 and the current directions in the combined coils 4 in the two coil groups 5 are consistent, the mechanical angle of the two coil groups 5 is 360 / Z°, Z is the total number of slots, and since the current directions of the two coil groups 5 on each branch are consistent, the current directions of the two branches are bound to be completely opposite, so that the phase difference between the two branches is 180°, thereby avoiding the potential difference between the two branches to form a circulating current, thereby improving the efficiency of the motor.

[0061] Fig.14 and Fig.15 The conductor layer arrangement of the combined coil 4 on the front side (connection side) and the back side (insertion side) is shown respectively. For the convenience of explanation, the leg portion I located at the same slot is 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 portions I of the first type of U-shaped conductor 1 are the first layer conductor L1 and the fourth layer conductor L4 of the respective slots, and the two leg portions I of the second type of U-shaped conductor 2 are the second layer conductor L2 and the third layer conductor L4 of the respective slots.

[0062] In specific use, the above-mentioned combined coil 4 can be arranged in the radial direction in the following four ways:

[0063] The first type: the outward-deflected and bent leg III of the first type U-shaped conductor 1 is set as the first layer conductor L1 and extends in the clockwise direction of the circumference, the outward-deflected and bent leg III of the second type U-shaped conductor 2 is set as the second layer conductor L2 and extends in the counterclockwise direction of the circumference, the inward-deflected and bent leg III of the second type U-shaped conductor 2 is set as the third layer conductor L3, and the inward-deflected and bent leg III of the first type U-shaped conductor 1 is set as the fourth layer conductor L4 and connected to the third layer conductor. Welding is generally used here.

[0064] The second type: the outward-deflected and bent leg III of the first-type U-shaped conductor 1 is set as the first-layer conductor L1 and extends counterclockwise along the circumference, the outward-deflected and bent leg III of the second-type U-shaped conductor 2 is set as the second-layer conductor L2 and extends clockwise along the circumference, the inward-deflected and bent leg III of the second-type U-shaped conductor 2 is set as the third-layer conductor L3, and the inward-deflected and bent leg III of the first-type U-shaped conductor 1 is set as the fourth-layer conductor L4 and connected to the third-layer conductor.

[0065] The third type: the outward-deflected and bent leg III of the first-type U-shaped conductor 1 is set as the fourth-layer conductor L4 and extends in the clockwise direction of the circumference, the outward-deflected and bent leg III of the second-type U-shaped conductor 2 is set as the third-layer conductor L3 and extends in the counterclockwise direction of the circumference, the inward-deflected and bent leg III of the second-type U-shaped conductor 2 is set as the second-layer conductor L2, and the inward-deflected and bent leg III of the first-type U-shaped conductor 1 is set as the first-layer conductor L1 and connected to the second-layer conductor.

[0066] The fourth type: the outward-deflected and bent leg III of the first-type U-shaped conductor 1 is set as the fourth-layer conductor L4 and extends along the clockwise direction of the circumference, the outward-deflected and bent leg III of the second-type U-shaped conductor 2 is set as the third-layer conductor L3 and extends along the counterclockwise direction of the circumference, the inward-deflected and bent leg III of the second-type U-shaped conductor 2 is set as the second-layer conductor L2, and the inward-deflected and bent leg III of the first-type U-shaped conductor 1 is set as the first-layer conductor L1 and connected to the second-layer conductor.

[0067] The clockwise and counterclockwise directions are determined with the connection side of the stator core 8 as the front side, inwards pointing to between the two legs I of the U-shaped conductor, and outwards pointing to outside the two legs of the U-shaped conductor.

[0068] In order to facilitate wiring and connection, the ends of the legs III of the first type U-shaped conductor 1 and the second type U-shaped conductor 2 both have connecting legs IV arranged parallel to the legs I, and the two connected connecting legs IV are arranged adjacent to each other in the radial direction. Fig.11 and 12 As shown, in any branch line, a group of two legs III arranged adjacent to each other in the radial direction are legs III for connecting to the power lead-out line and legs III for connecting to the star point line.

[0069] The stator in this embodiment adopts the first method, and in this embodiment, The number of stator pole pairs P=4, each The number of slots per phase is Q = 2, the number of stator core slots is Z = 48 slots, the number of conductors per slot is A = 4, the pitch is Y = 6, and the number of parallel branches is R = 2 .

[0070] Since P=4, four combined coils 4 are arranged in an array in the circumferential direction of the stator core 8, and the connection pins IV of each combined coil 4 are connected to form a coil group 5, such as Figure 4 and Figure 5 As shown. Since Q = 2, 2Q = 4 coil groups 5 are arranged in the circumferential direction of the stator to form a phase winding, as shown Figure 8As shown. This embodiment adopts a standard integer slot winding, so when one of the four coil groups 5 is fixed, the other three coil groups 5 are offset by mechanical angles of 360° / Z=7.5°, Y*360° / Z=45° and (Y+1)*360° / Z=52.5° in the circumferential direction of the stator core 8 relative to the fixed coil group 5. Among them, the coil group 5 offset by 360° / Z=7.5° and the fixed coil group 5 are a pair of coil groups 5 arranged on circumferentially adjacent slots, and the current flow directions of the two are the same; the coil group 5 offset by Y*360° / Z=45° and the coil group 5 offset by (Y+1)*360° / Z=52.5° are a pair of coil groups 5 arranged on circumferentially adjacent slots, and the current flow directions of the two are the same, and opposite to the current flow direction of the other group.

[0071] like Figure 6 and Figure 7 As shown, for any of the above coil groups 5, since each coil group 5 is formed by connecting a plurality of combined coils 4 end to end in a circle along the circumferential direction of the stator core 8, when the coil group 5 located in the slot on the side of the deflection direction of the outwardly deflected leg III of the first type of U-shaped conductor 1 is provided with a first type of U-shaped conductor 1 with a pitch of Y-1, that is, the coil group 5 in the slot on the clockwise side in this embodiment, as shown in FIG. Figure 6 The coil group represented by the dotted line has a first type of U-shaped conductor 1 with a pitch of Y-1, leg III ( Figure 7 The leg portion connected to the support leg (1-1 on the left side of the middle) is relatively connected to the combined coil 4 ( Figure 7 The combined coils 1-1 and 1-2 on the right side of the middle are deflected inwards into a slot, so that the connecting pin IV ( Figure 7 The connecting foot Ⅳ (the foot indicated by 1-1 on the left side of the middle) and its first end foot Ⅲ Figure 7 There is a slot difference between the legs 1-2 on the left side of the middle) and it is bound to be connected to the first leg III ( Figure 7 The connecting feet IV (the legs indicated by 2-2 on the left side) are arranged side by side.

[0072] Another coil group 5 in the group is provided with a first type U-shaped conductor 1 with a pitch of Y+1. The leg III of the first type U-shaped conductor 1 with a pitch of Y+1 is deviated outward by one slot relative to the combined coil 4, that is, it is moved forward by one slot clockwise, so that the connection foot IV ( Figure 7 The connecting foot Ⅳ (2-1 on the left side of the middle) and its first end foot Ⅲ Figure 7 The 2-2 on the left side of the middle crosses a slot, which is bound to overlap with the connecting pin IV ( Figure 7 1-2 on the left side of the center) side by side.

[0073] Thus, directly connecting any of the staggered and parallel head leg III and tail leg III can connect the two coil groups 5 in parallel into one branch. The staggered and parallel head leg III and tail leg III are arranged adjacent to each other and are close to each other, so they can be directly connected without a jumper conductor.

[0074] In this embodiment, a three-phase stator winding is used, so three two-branch phase windings are arranged in the stator circumferential direction to form a three-phase stator winding. Figure 11 to Figure 13 As shown, finally, a star point connection conductor 7 connecting the three phase windings is arranged at the connection end of each phase winding to realize the star point connection of the three-phase winding.

[0075] Example 2 (such as Figure 1 , 2 , 16~ Fig.30 )

[0076] An electric machine, comprising a stator, such as Fig.28 As shown, the stator includes a stator core 8 and two-branch phase windings of three phases installed on the stator core 8, one end of the two parallel branches on each phase winding is connected to a power lead conductor 6, and the other end is connected to each other through a star point connection conductor 7.

[0077] The stator core 8 includes a main body that is cylindrical as a whole. A plurality of stator core slots that are radially inwardly open are arranged in the inner ring of the stator core 8 along the circumferential direction. One end of the stator core slot is an insertion side, and the other end is a connection side. In this embodiment, Fig.28 As shown, the upward end is the connection side, and the downward end is the insertion side. The three-phase two-branch phase winding is arranged in the stator core slot, and each phase of the two-branch phase winding includes two parallel branches, such as Fig. 20 As shown, each branch includes two coil groups 5 arranged in adjacent slots in the circumferential direction and connected in series. Fig.18 and Fig.19 As shown, each coil group 5 is formed by M combined coils 4 connected in sequence along the circumferential direction of the stator core 8, where M is equal to the number of magnetic pole pairs of the phase winding.

[0078] In this embodiment, Fig.17 As shown, the combined coil 4 includes a first type of U-shaped conductor 1, a second type of U-shaped conductor 2 and an overall ring-shaped O-shaped conductor 3. The first type of U-shaped conductor 1 and the second type of U-shaped conductor 2 both include an overall U-shaped bending hairpin body, the hairpin body includes two mutually parallel supporting legs I and a head II connected to one end of the two supporting legs I. The other end of the two supporting legs I is respectively provided with a supporting foot III. The two supporting feet III located on the same hairpin body are bent toward the same side in the width direction of the hairpin body. Fig.16As 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.

[0079] The two legs 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, and the second-type U-shaped conductor 2 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 the head II of the second-type U-shaped conductor 2 is covered in the head II of the first-type U-shaped conductor 1. 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 to form the combined coil 4 in which the two legs III of the O-shaped conductor 3 are respectively connected to the other adjacent legs III in the thickness direction, and the legs III of the first-type U-shaped conductor 1 that are bent outwards and the legs III of the second-type U-shaped conductor 2 that are bent outwards are away from each other, as Fig.17 shown.

[0080] like Figure 1 , Figure 2 and Fig.16 As shown, the head II of the first type of U-shaped conductor 1, the second type of U-shaped conductor 2 and the O-shaped conductor 3 are all V-shaped with a top, and the two sides of the head II and the two legs I are radially staggered from the top of the V-shaped front and back. In specific implementation, the head II can also be set to an arc shape. The first type of U-shaped conductor 1, the second type of U-shaped conductor 2 and the O-shaped conductor 3 are all bent by rectangular cross-section copper wire.

[0081] In the two coil groups 5 on any branch, a first-type biased U-shaped conductor 1 with a pitch of Y+1 and a first-type biased U-shaped conductor 1 with a pitch of Y-1 are respectively provided, and the pitches of all other first-type biased U-shaped conductors 1 and second-type biased U-shaped conductors 2 are Y; the combined coil 4 where the first-type biased U-shaped conductor 1 with a pitch of Y+1 on one coil group 5 is located and the combined coil 4 where the first-type biased U-shaped conductor 1 with a pitch of Y-1 on another coil group 5 is located in circumferentially adjacent slots, such as Figure 18 to Figure 20 As shown, Fig. 20 The coil group represented by the solid line is Fig.18 The coil group in the figure is represented by the dotted line. Fig.19 The coil group in Fig.18 , Fig.10 and Fig. 20 The perspective is completely consistent, from Fig.18 It can be seen from the circled parts at A-3 and A-4 that a first type U-shaped conductor 1 with a pitch of Y+1 is arranged in the coil group 5, so that its leg portion is deviated outward by one slot, that is, the leg portion I where the leg III of the first type U-shaped conductor 1 with a pitch of Y+1 deviates outward by one slot relative to the second type U-shaped conductor 2 in the combined coil 4 where it is located. Fig.19 It can be seen from the circled parts at B-3 and B-4 in the figure that a first type U-shaped conductor 1 with a pitch of Y-1 is arranged in the coil group 5, so that its leg portion is deflected inwardly into a slot, that is, the leg portion I where the leg III deflected and bent outwardly on the first type U-shaped conductor 1 with a pitch of Y-1 is located is deflected inwardly into a slot relative to the second type U-shaped conductor 2 in the combined coil 4 where it is located.

[0082] When implementing it, Fig. 20 As shown, on any branch, in the two coil groups 5 arranged at circumferentially adjacent slots, the coil group 5 located in the slot on the side of the deflection direction of the outwardly deflected leg III on the first-type U-shaped conductor 1 is provided with a first-type U-shaped conductor 1 with a pitch of Y-1, and the other coil group 5 is provided with a first-type U-shaped conductor 1 with a pitch of Y+1.

[0083] In this way, the leg portion I of the first type of U-shaped conductor 1 with a pitch of Y-1, where the leg III deviates outward and is bent, deviates inward by one slot, so that the leg of the first type of U-shaped conductor 1 with a pitch of Y-1 shrinks back by one slot, as shown in FIG. Fig.19 As shown, the leg portion I of the first type of U-shaped conductor 1 with a pitch of Y+1, where the leg III is bent outward, is deviated outward by one slot, so that the leg of the first type of U-shaped conductor 1 with a pitch of Y+1 extends outward by one slot, as shown in FIG. Fig.18 As shown, the leg III that needs to be connected in series with another coil group 5 is located in the same slot, so there is no need to set up an additional jumper conductor, and the two can be welded together, reducing the amount of ineffective copper. In addition, since the two coil groups 5 connected in series on each branch are set in circumferentially adjacent slots, that is, the shapes of the two coil groups 5 and the current directions in the combined coils 4 in the two coil groups 5 are consistent, the mechanical angle of the two coil groups 5 is 360 / Z°, Z is the total number of slots, and since the current directions of the two coil groups 5 on each branch are consistent, the current directions of the two branches are bound to be completely opposite, so that the phase difference between the two branches is 180°, thereby avoiding the potential difference between the two branches to form a circulating current, thereby improving the efficiency of the motor.

[0084] Similar to the first embodiment, the combined coil 4 with the O-shaped conductor 3 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:

[0085] 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.

[0086] 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.

[0087] 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.

[0088] The fourth method is to set the leg part 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 counterclockwise direction along the circumference.

[0089] The clockwise and counterclockwise directions are determined with the connection side of the stator core 8 as the front side, inwards pointing to between the two legs I of the U-shaped conductor, and outwards pointing to outside the two legs of the U-shaped conductor.

[0090] The second type of U-shaped conductor 2 and O-shaped conductor 3 stacked in the first type of U-shaped conductor 1 have different arrangement and combination orders. In the combination form, n is the sum of the number of the second type of U-shaped conductors 2 and the O-shaped conductors 3, so that the combined coil 4 with the O-shaped conductor 3 added has A stacking method.

[0091] However, by arranging the leg III of the first type U-shaped conductor 1 and the leg III of the second type U-shaped conductor 2 as two adjacent layers of conductors, the legs III on the two connected combined coils 4 can be adjacent to each other without using a jumper conductor. Therefore, in specific implementation, the following structure is usually adopted:

[0092] For ease of explanation, the leg portion I located at the same slot is divided into a first layer conductor, a second layer conductor...Ath layer conductor from outside to inside in the radial direction, where A is an even number greater than 4; when the leg portion I where the outwardly deflected and bent leg III of the first-type U-shaped conductor 1 is located and the leg portion I where the inwardly deflected and bent leg III is located are respectively the first layer conductor and the Ath layer conductor of their respective slots, the leg portion I where the outwardly deflected and bent leg III of the second-type U-shaped conductor 2 is located and the leg portion I where the inwardly deflected and bent leg III is located are respectively the second layer conductor and the third layer conductor of their respective slots, and the leg portion I of the O-shaped conductor 3 is respectively the 2nth layer conductor and the 2n+1th layer conductor of their respective slots, 2≦n≦A / 2-1. When the leg portion I where the outward-deflected leg III of the first-type U-shaped conductor 1 is located and the leg portion I where the inward-deflected leg III is located are respectively the Ath layer conductor and the first layer conductor of their respective slots, the leg portion I where the outward-deflected leg III of the second-type U-shaped conductor 2 is located and the leg portion I where the inward-deflected leg III is located are respectively the A-1th layer conductor and the A-2th layer conductor of their respective slots, and the leg portion I of the O-shaped conductor 3 is respectively the A-2nth layer conductor and the A-2n+1th layer conductor of their respective slots, 2≦n≦A / 2-1.

[0093] In order to facilitate wiring and connection, the legs III of the first type U-shaped conductor 1 and the second type U-shaped conductor 2 both have connecting legs IV arranged parallel to the leg portion I, and the two connected connecting legs IV are arranged adjacent to each other in the radial direction. Fig.25 and Fig.26 As shown, in any branch line, a group of two legs III arranged adjacent to each other in the radial direction are legs III for connecting to the power lead-out line and legs III for connecting to the star point line.

[0094] In this embodiment, the combined coil 4 is formed by using a first-type U-shaped conductor 1, a second-type U-shaped conductor 2 and two O-shaped conductors 3 arranged on the basis of the first basic arrangement mode. Specifically, the outwardly deflected and bent leg III of the first-type U-shaped conductor 1 is the first-layer conductor L1 and extends clockwise; the outwardly deflected and bent leg III of the second-type U-shaped conductor 2 is the second-layer conductor L2 and extends counterclockwise, and the inwardly deflected and bent leg III of the second-type U-shaped conductor 2 is the third-layer conductor L 3; 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 the 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 the rear leg III is the seventh layer conductor L7; the leg III of the first type of U-shaped conductor 1 that is bent inward is the eighth layer conductor L8 and is connected to the leg III of the seventh layer conductor. Fig.29 and Fig.30 The conductor layer arrangements of the combined coil 4 are shown on the front side (connection side) and the back side (insertion side).

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

[0096] Since P=4, four combined coils 4 are arranged in an array in the circumferential direction of the stator core 8, and the connection pins IV of each combined coil 4 are connected to form a coil group 5, such as Fig.18 and Fig.19 As shown. Since Q = 2, 2Q = 4 coil groups 5 are arranged in the circumferential direction of the stator to form a phase winding, as shown Fig. 22 As shown. This embodiment adopts a standard integer slot winding, so when one of the four coil groups 5 is fixed, the other three coil groups 5 are offset by mechanical angles of 360° / Z=7.5°, Y*360° / Z=45° and (Y+1)*360° / Z=52.5° in the circumferential direction of the stator core 8 relative to the fixed coil group 5. Among them, the coil group 5 offset by 360° / Z=7.5° and the fixed coil group 5 are a pair of coil groups 5 arranged on circumferentially adjacent slots, and the current flow directions of the two are the same; the coil group 5 offset by Y*360° / Z=45° and the coil group 5 offset by (Y+1)*360° / Z=52.5° are a pair of coil groups 5 arranged on circumferentially adjacent slots, and the current flow directions of the two are the same, and opposite to the current flow direction of the other group.

[0097] like Fig. 20 and Fig.21 As shown, for any of the above coil groups 5, since each coil group 5 is formed by connecting a plurality of combined coils 4 end to end in a circle along the circumferential direction of the stator core 8, when the coil group 5 located in the slot on the side of the deflection direction of the outwardly deflected leg III of the first type of U-shaped conductor 1 is provided with a first type of U-shaped conductor 1 with a pitch of Y-1, that is, the coil group 5 in the slot on the clockwise side in this embodiment, as shown in FIG. Fig. 20 The coil group represented by the dotted line has a first type of U-shaped conductor 1 with a pitch of Y-1, leg III ( Fig.21 The leg indicated by 1-1 in the figure is deviated into a slot relative to the combined coil 4, so that the tail leg III ( Fig.21 The connecting foot Ⅳ of the support foot (in 1-1) and its head end support foot Ⅲ ( Fig.21 The connection pin IV of the support leg indicated by 1-2 in the figure differs by one slot, and is bound to be connected to the head end support leg III ( Fig.21 The connecting feet IV (the supporting feet indicated in 2-2) are arranged side by side.

[0098] Another coil group 5 in the group is provided with a first type biased U-shaped conductor 1 with a pitch of Y+1, and the leg III ( Fig.21 The leg indicated by 2-1 in the figure) is one slot outward relative to the combined coil 4, that is, it is moved forward one slot clockwise, so that its tail leg III ( Fig.21 The connecting foot Ⅳ of the support foot (2-1) and its head end support foot Ⅲ ( Fig.21 The connection pins IV of the support legs (indicated by 2-2) overlap by one slot, and are bound to overlap with the first end support legs III ( Fig.21 The connecting feet IV (the supporting feet indicated in 1-2) are arranged side by side.

[0099] Thus, directly connecting any of the staggered and parallel head leg III and tail leg III can connect the two coil groups 5 in parallel into one branch. The staggered and parallel head leg III and tail leg III are arranged adjacent to each other and are close to each other, so they can be directly connected without a jumper conductor.

[0100] In this embodiment, a three-phase stator winding is used, so three two-branch phase windings are arranged in the stator circumferential direction to form a three-phase stator winding 10. Finally, a star point connection conductor 7 connecting the three phase windings is provided at the connection end of each phase winding to realize the star point connection of the three-phase winding. Figure 25 to Figure 28 shown.

[0101] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A two-branch phase winding, characterized in that: The invention comprises a coil group for installation in a stator core slot, wherein the coil group is formed by sequentially connecting M combination coils, wherein M is equal to the number of magnetic pole pairs of a phase winding, wherein the combination coil comprises a first type of U-shaped conductor and a second type of U-shaped conductor, wherein the first type of U-shaped conductor and the second type of U-shaped conductor both comprise a hairpin body bent in a U shape as a whole, wherein the hairpin body comprises two leg portions arranged in parallel with each other and a head connected to one end of the two leg portions, wherein the other ends of the two leg portions are each provided with a foot, and the two feet located on the same hairpin body are arranged in a width direction of the hairpin body. The projections of the first-type U-shaped conductor and the second-type U-shaped conductor in the thickness direction of the hairpin body overlap each other, and the legs of the first-type U-shaped conductor and the legs of the second-type U-shaped conductor are deflected and bent in opposite directions, so that the legs of the first-type U-shaped conductor that are deflected and bent outward and the legs of the second-type U-shaped conductor that are deflected and bent outward are separated from each other, and the legs of the first-type U-shaped conductor that are deflected and bent toward the middle and the legs of the second-type U-shaped conductor that are deflected and bent toward the middle are close to and connected to form the combined coil; Each branch includes two coil groups which are arranged on circumferentially adjacent slots and connected in series, wherein a first-type biased U-shaped conductor with a pitch of Y+1 and a first-type biased U-shaped conductor with a pitch of Y-1 are respectively arranged in the two coil groups, and the pitches of all other first-type biased U-shaped conductors and second-type biased U-shaped conductors are both Y; the first-type biased U-shaped conductor with a pitch of Y+1 on one coil group and the first-type biased U-shaped conductor with a pitch of Y-1 on the other coil group are located in circumferentially adjacent slots, the leg portion of the outwardly deflected and bent leg on the first-type biased U-shaped conductor with a pitch of Y+1 is located one slot outward relative to the combined coil where it is located, and the leg portion of the outwardly deflected and bent leg on the first-type biased U-shaped conductor with a pitch of Y-1 is located one slot inward relative to the combined coil where it is located; 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; On any branch line, a group of two legs adjacent to each other in the radial direction are legs for connecting to the power lead-out line and legs for connecting to the star point line.

2. The two-branch phase winding according to claim 1, characterized in that: The combination coil also includes an O-shaped conductor in an overall ring shape, the O-shaped conductor includes a hairpin body that is bent in an overall U shape, the hairpin body includes two legs arranged in parallel to each other and a head connected to one end of the two legs, the other end of each of the two legs is provided with a foot, the two feet are deflected and 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 located between the two legs of the first type of U-shaped conductor in the thickness direction of the first type of U-shaped conductor, and is stacked with the second type of U-shaped conductor to form the combination coil in which the two feet of the O-shaped conductor are respectively connected to other adjacent feet in the thickness direction, and the foot of the first type of U-shaped conductor that is deflected and bent outwards and the foot of the second type of U-shaped conductor that is deflected and bent outwards are away from each other.

3. The two-branch phase winding according to claim 1, characterized in that: The leg portions located at the same slot are divided into a first layer conductor, a second layer conductor, a third layer conductor and a fourth layer conductor from outside to inside in the radial direction; the two leg portions of the first type of U-shaped conductor are respectively the first layer conductor and the fourth layer conductor of the respective slots, 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 the respective slots.

4. The two-branch phase winding according to claim 2, characterized in that: The leg portions located at the same slot are divided into a first layer conductor, a second layer conductor ... an Ath layer conductor from outside to inside in the radial direction, where A is an even number greater than 4; the two leg portions of the first-type U-shaped conductor are respectively the first layer conductor and the Ath layer conductor of the respective slots, the two leg portions of the second-type U-shaped conductor are respectively the second layer conductor and the third layer conductor or the (A-1)th layer conductor and the (A-2)th layer conductor of the respective slots, and the leg portions of the O-shaped conductor are respectively the 2nth layer conductor and the 2n+1th layer conductor or the A-2nth layer conductor and the A-2n+1th layer conductor of the respective slots, 2≦n≦A / 2-1.

5. The two-branch phase winding according to claim 1 or 3, characterized in that: The legs of the first-type U-shaped conductor and the second-type U-shaped conductor both have connecting legs arranged parallel to the leg parts, and the two connected connecting legs are arranged adjacent to each other in the radial direction; the head of the first-type U-shaped conductor and the second-type U-shaped conductor is a V-shape or an arc with a top, and the two sides of the head and the two legs are radially staggered front and back from the top of the V-shape or the arc; the first-type U-shaped conductor and the second-type U-shaped conductor are both formed by bending flat copper wire or rectangular cross-section copper wire.

6. The two-branch phase winding according to claim 2 or 4, characterized in that: The legs of the first type of U-shaped conductor, the second type of U-shaped conductor and the O-shaped conductor all have connecting legs arranged parallel to the leg parts, and the two connected connecting legs are arranged adjacent to each other in the radial direction; the head of the first type of U-shaped conductor, the second type of U-shaped conductor and the O-shaped conductor is a V-shape or an arc with a top, and the two sides of the head and the two legs are staggered forward and backward along the radial direction from the top of the V-shape or the arc; the first type of U-shaped conductor, the second type of U-shaped conductor and the O-shaped conductor are all formed by bending flat copper wire or rectangular cross-section copper wire.

7. A stator, characterized in that: It comprises a stator core and two-branch phase windings as claimed in any one of claims 1 to 6 installed on the stator core, one end of the two-branch phase windings of the three phases are respectively connected to power lead conductors, and the other ends are connected to each other through a star point connection conductor.

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

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