CN111668956B

CN111668956B - Outer wrapping type stator assembly and motor

Info

Publication number: CN111668956B
Application number: CN202010595933.5A
Authority: CN
Inventors: 黄朝东; 邵俊山
Original assignee: Chongqing Zongshen Electric Power Technology Co ltd
Current assignee: Chongqing Zongshen Electric Power Technology Co ltd
Priority date: 2020-06-24
Filing date: 2020-06-24
Publication date: 2022-10-21
Anticipated expiration: 2040-06-24
Also published as: CN111668956A

Abstract

The invention discloses an externally-wrapped stator assembly and a motor, which comprise a stator core and stator windings arranged in stator slots, wherein each phase winding of the stator windings comprises two groups of coil ring groups which are staggered with each other by Y stator slots in the circumferential direction of the stator core; each coil ring group comprises K coil rings, and K is more than or equal to 2; the coil ring is formed by connecting P hairpin conductor groups in series, and P is the magnetic pole pair number; the hairpin conductor group comprises 1+ H hairpin conductors, wherein H is 2 or an odd number larger than 2; the hairpin conductor comprises a hairpin main body which is bent integrally in a U shape; in the hairpin conductor group, two leg parts of one hairpin conductor are respectively positioned on the 1 st layer and the 2H +2 nd layer in the stator slot where the hairpin conductor is positioned, and two leg parts of other hairpin conductors are respectively positioned on the A-th layer and the A + H-th layer in the stator slot where the hairpin conductor is positioned, wherein A is more than 1 and less than or equal to H +1. The outer wrapping type stator assembly and the motor have the advantages of reasonable structural design, few conductor types, contribution to reducing the production cost and the like.

Description

Outer wrapping type stator assembly and motor

Technical Field

The invention relates to the technical field of motors, in particular to an outer wrapping type stator assembly and a motor.

Background

An electric machine (including a motor and a generator) is a device for converting electric energy into mechanical energy (or converting mechanical energy into electric energy) according to the principle of electromagnetic induction, and can be used as a power source or a power generation device of various electric appliances such as household appliances, various machines such as electric vehicles and electric automobiles. The motors can be classified into dc motors and ac motors according to the kinds of their operating power sources, and the ac motors can be classified into single-phase motors and multi-phase motors (e.g., three-phase motors). The motor comprises a stator and a rotor, and a winding is arranged in a stator core slot of the stator. The traditional winding is formed by winding a round conducting wire, although the winding process is relatively simple, the space utilization rate in an iron core groove is low, useless copper at the end is wasted greatly, the power density is low, and the winding is gradually replaced by a flat copper wire or a rectangular-section copper wire.

At present, the windings of a flat copper wire or a rectangular section copper wire are mainly formed by connecting segmented hairpin conductors which are bent integrally in a U shape, when a short-distance winding is adopted, the leg parts of the hairpin conductors of two-phase or multi-phase windings exist in the same stator core slot, when a motor runs, voltage difference exists between the leg parts of adjacent different-phase windings in the same slot, and the insulation varnish of the flat copper wire material used by the hairpin conductors is easily damaged, so that the service life of the motor is influenced, and the arrangement mode of the hairpin conductors in the phase windings influences the arrangement positions of the leg parts of the different-phase windings in the slot.

Disclosure of Invention

Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: how to provide a structural design is reasonable, and the conductor kind is few, is favorable to reduction in production cost's outer cladding stator module and motor.

In order to solve the technical problems, the invention adopts the following technical scheme:

an outer wrapping type stator assembly comprises a cylindrical stator core, wherein a plurality of stator slots are uniformly distributed along the circumferential direction of the stator core, and stator windings are arranged in the stator slots; the motor is characterized in that each phase of winding of the stator winding comprises two groups of coil ring groups which are staggered with Y stator slot positions in the circumferential direction of the stator core, and Y is a polar distance; each coil ring group comprises K coil rings which are staggered with one stator slot position in sequence in the circumferential direction of the stator core, and K is more than or equal to 2; the coil ring is formed by connecting P hairpin conductor groups uniformly distributed along the circumferential direction of the stator in series, and P is a magnetic pole pair number; the hairpin conductor group comprises 1+ H hairpin conductors, wherein H is 2 or an odd number larger than 2; the hairpin conductor comprises a hairpin main body which is bent integrally in a U shape, the hairpin main body comprises two leg parts which are arranged in parallel and heads which are connected to one ends of the two leg parts, and the other ends of the two leg parts are respectively provided with a supporting leg; in the hairpin conductor group, two leg parts of one hairpin conductor are respectively positioned on the 1 st layer and the 2H +2 nd layer in the stator slot where the hairpin conductor is positioned, and two leg parts of other hairpin conductors are respectively positioned on the A-th layer and the A + H-th layer in the stator slot where the hairpin conductor is positioned, wherein A is more than 1 and is not more than H +1.

By adopting the structure, the leg parts of the 2H +2 layers of hairpin conductors can be arranged in each stator slot, because in the same hairpin conductor group, the two leg parts of the outer-coated hairpin conductor are respectively at the 1 st layer and the 2H +2 th layer in the stator slot, the leg parts of other hairpin conductors are respectively at the A th layer and the A + H layer in the stator slot, and each hairpin conductor has two leg parts, half of the leg parts are at the H +2 to 2H +2 layers in the stator slot, and the other half of the leg parts are at the 1 st to H +1 layer in the stator slot in each hairpin conductor group; i.e. a continuous H +1 layer occupying the outer side and a continuous H +1 layer occupying the inner side of the stator slot, respectively. Therefore, in the same stator slot, the supporting legs of the same phase winding are occupied, or the two adjacent phase windings are equally divided from the middle part, so that only one side of the two phase windings in the same stator slot is adjacent to each other, the adjacent area of the inter-phase conductors in the same slot is greatly reduced, the probability of inter-phase discharge is favorably reduced, and the service life of the motor is prolonged. In addition, when the hairpin conductor is assembled, the hairpin conductor needs to be bent into a U shape through a die and inserted onto the stator core, and then is integrally bent layer by layer through bending equipment for forming. The mould of hairpin conductor needs the pitch and the relative position of two shank in the stator slot according to the hairpin conductor to confirm, in the above-mentioned structure, under the equal unanimous condition of pitch of all hairpin conductors, two shank of hairpin conductor are only two kinds in the relative position of stator slot, two shank of one of them hairpin conductor are located 1 st layer and 2H +2 layers (the relative position is striding 2H +1 layer) in the stator slot of place respectively, two shank of another kind of hairpin conductor are located A layer and A + H layer (the relative position is striding the H layer) in the stator slot of place respectively, thereby can greatly reduced the kind and the mould of hairpin conductor, reduction in production cost and assembly degree of difficulty.

Further, the pitch of the hairpin conductor is Y-1, and Y is a polar distance; the hairpin conductor group comprises two groups of hairpin conductors which are respectively arranged at two magnetic pole positions adjacent to the circumferential direction of the stator core, and in the same hairpin conductor group, in the circumferential direction of the stator core, two groups of leg parts which are close to one side of each other in the hairpin conductors are respectively positioned in two adjacent stator slots and are mutually linked.

Further, H =2, the hairpin conductor group includes 3 hairpin conductors, one of which is a wave conductor with two legs deflected and bent in the width direction of the hairpin body along the opposite direction, and the other two are O-shaped conductors which are annular as a whole, and the two legs of the O-shaped conductor are deflected and bent towards the middle part in the width direction of the hairpin body and are arranged at intervals in a staggered manner in the thickness direction of the hairpin body; the two O-shaped conductors are positioned at the same magnetic pole position in the radial direction of the stator and are connected with the wave-shaped conductors in the circumferential direction of the stator core; one leg of the wave conductor is connected with one leg of one O-shaped conductor in a welding mode, the other leg of the O-shaped conductor is connected with the leg of the other O-shaped conductor in a welding mode, and the other leg of the wave conductor is connected with one leg of the O-shaped conductor on the other adjacent hairpin conductor group in a welding mode.

Further, H =2, the hairpin conductor group includes 3 hairpin conductors, one of the hairpin conductors is an O-shaped conductor which is annular as a whole, the other two conductors are a first type of inclined U-shaped conductor and a second type of inclined U-shaped conductor which are arranged side by side in the radial direction of the stator, a leg on one leg on the first type of inclined U-shaped conductor and a leg on the other leg on the second type of inclined U-shaped conductor are deflected and bent in a direction away from each other in the width direction of the hairpin body, and the other two legs of the first type of inclined U-shaped conductor and the second type of inclined U-shaped conductor are bent and welded to each other in the width direction of the hairpin body; the two support legs of the O-shaped conductor deflect and bend towards the middle part in the width direction of the hairpin body and are arranged at intervals in a staggered manner in the thickness direction of the hairpin body; the O-shaped conductor, the first type of inclined U-shaped conductor and the second type of inclined U-shaped conductor are connected in the circumferential direction of the stator core; two leg parts of the O-shaped conductor are respectively positioned on the 1 st layer and the 6 th layer in the stator slot where the O-shaped conductor is positioned, one leg of the O-shaped conductor is connected with one leg of the first type of inclined U-shaped conductor or the second type of inclined U-shaped conductor in a welding mode, and the other leg of the O-shaped conductor is connected with one leg of the second type of inclined U-shaped conductor or the first type of inclined U-shaped conductor on the other adjacent hairpin conductor group in a welding mode.

Further, when H is an odd number greater than 2, the hairpin conductor group includes two groups of hairpin conductors arranged in a circumferential engagement manner on the stator core, wherein one group of hairpin conductors includes a wave conductor and J first type of inclined-U-shaped conductors, the other group of hairpin conductors includes an O-shaped conductor and J second type of inclined-U-shaped conductors which are annular as a whole, and H =2j +1; the two support legs of the corrugated conductor deflect and bend along the opposite direction in the width direction of the hairpin main body; the two support legs of the O-shaped conductor deflect and bend towards the middle part in the width direction of the hairpin main body and are arranged at intervals in a staggered manner in the thickness direction of the hairpin main body; the two supporting legs of the first type of the U-shaped deflection conductors bend towards the second type of the U-shaped deflection conductors in a deflection mode, and the two supporting legs of the second type of the U-shaped deflection conductors bend towards the first type of the U-shaped deflection conductors in a deflection mode.

Further, H =3, two leg portions of the wave-shaped conductor are respectively located at the 1 st layer and the 8 th layer in the stator slot where the wave-shaped conductor is located, and two leg portions of the first-type offset U-shaped conductor are respectively located at the 3 rd layer and the 6 th layer in the stator slot where the wave-shaped conductor is located; two leg parts of the second type of the inclined U-shaped conductor are respectively positioned on the 4 th layer and the 7 th layer in the stator slot where the second type of the inclined U-shaped conductor is positioned, and two leg parts of the O-shaped conductor are respectively positioned on the 2 nd layer and the 5 th layer in the stator slot where the second type of the inclined U-shaped conductor is positioned.

Further, H =3, two leg portions of the O-shaped conductor are respectively located at the 1 st layer and the 8 th layer in the stator slot where the O-shaped conductor is located, and two leg portions of the second type of the off-U-shaped conductor are respectively located at the 3 rd layer and the 6 th layer in the stator slot where the O-shaped conductor is located; the two leg parts of the wave-shaped conductor are respectively positioned on the 2 nd layer and the 5 th layer in the stator slot where the wave-shaped conductor is positioned, and the two leg parts of the first type of inclined U-shaped conductor are respectively positioned on the 4 th layer and the 7 th layer in the stator slot where the wave-shaped conductor is positioned.

An electrical machine comprising an overwrap stator assembly as described above.

In conclusion, the outer wrapping type stator assembly and the motor have the advantages of being reasonable in structural design, few in conductor types, beneficial to reducing production cost and the like.

Drawings

Fig. 1 is a schematic structural view of a stator in embodiment 1.

Fig. 2 is a schematic diagram of the structure of the method in the circle in embodiment 1.

Fig. 3 is a schematic structural view of a three-phase winding in embodiment 1.

Fig. 4 is a schematic structural view of a coil loop a1 in embodiment 1.

Fig. 5 is a schematic structural view of example 1 in which coil loops a1 and a2 are connected in series.

Fig. 6 is a schematic structural view of a corrugated conductor in embodiment 1.

Fig. 7 is a schematic structural view of an O-shaped conductor in embodiment 1.

Fig. 8 is a schematic diagram of the structure of the hairpin conductor set in example 1.

Fig. 9 is a schematic structural view of example 1 in which coil loops a1, a2, and b1 are connected in series.

Fig. 10 is a schematic view of the structure of one phase winding in embodiment 1.

Fig. 11 is an enlarged schematic view of the circle in fig. 10.

Fig. 12 is a schematic view of the crown side of the stator in which one phase winding is mounted in embodiment 1.

Fig. 13 is a structural schematic diagram of the cross section of fig. 12.

Fig. 14 is a schematic view of the structure of fig. 13 at the circle.

Fig. 15 is a schematic structural view of a coil ring a1 in embodiment 2.

Fig. 16 is a schematic structural view of the coil loop a2 in embodiment 2.

Fig. 17 is a schematic structural diagram of a first type of offset U-shaped conductor.

Fig. 18 is a schematic structural diagram of a second type of U-shaped offset conductor.

Fig. 19 is a schematic structural diagram of a hairpin conductor set in example 2.

Fig. 20 is a schematic structural view of example 2 in which coil loops a1 and a2 are connected in series.

Fig. 21 is a schematic view of a structure in which coil loops b1 and b2 are connected in series in embodiment 2.

Fig. 22 is a schematic view of the structure of one phase winding in embodiment 2.

Fig. 23 is a schematic view of the crown side of a stator in which one phase winding is mounted in embodiment 2.

Fig. 24 is a structural schematic diagram of the cross section of fig. 23.

Fig. 25 is a schematic view of the structure of fig. 24 at the circle.

Detailed Description

The present invention will be described in further detail with reference to examples.

Example 1: as shown in fig. 1 to 14, a motor includes a stator, the stator includes a stator core 8 and three phase windings installed on the stator core 8, one end of each branch on the phase windings is connected with each other through a star point connecting conductor 7, and the other end of two parallel branches on each phase winding is connected in parallel through a power supply leading conductor 6. The stator core 8 includes that the whole is the main part of cylinder the inner circle of stator core 8 is provided with a plurality of along the circumference along the radial inside open-ended stator core groove, the lower extreme of stator core groove is for inserting the side (or being called the hat side), and the upper end is the connection side.

Each phase of winding of the stator winding comprises two coil ring groups which are staggered with each other by Y stator slot positions in the circumferential direction of the stator core, and Y is a polar distance; each coil ring group comprises K coil rings which are staggered with one stator slot position in sequence in the circumferential direction of the stator core, and K is more than or equal to 2; the coil ring is formed by connecting P hairpin conductor groups uniformly distributed along the circumferential direction of the stator in series, and P is a magnetic pole pair number; the hairpin conductor group comprises 1+ H hairpin conductors, wherein H is 2 or an odd number larger than 2; the hairpin conductor comprises a hairpin main body which is bent integrally in a U shape, the hairpin main body comprises two leg parts which are arranged in parallel and a head part connected to one ends of the two leg parts, and the other ends of the two leg parts are respectively provided with a supporting leg.

In this embodiment, K =2,h =2, in the assembled state, each stator core slot has 6 (2h + 2) leg portions, and each phase winding includes two coil loop groups each composed of 2 coil loops, namely a coil loop group a and a coil loop group b; the coil ring group a and the coil ring group b are arranged at positions staggered by Y stator slots in the circumferential direction of the stator core, wherein Y is a polar distance, in the embodiment, the polar distance Y =6, and the pitch of the hairpin conductor is 5.

As shown in fig. 4 and 5, the coil loop group a includes a coil loop a1 and a coil loop a2 which are sequentially arranged in a clockwise direction; as shown in fig. 9 and 10, the coil loop group b includes a coil loop b1 and a coil loop b2 which are sequentially arranged in a clockwise direction.

In this embodiment, the number of pole pairs P =4, that is, each of the coil loop a1, the coil loop a2, the coil loop b1, and the coil loop b2 is formed by connecting in series 4 hairpin conductor groups uniformly distributed in the circumferential direction of the stator core, as shown in fig. 4.

As shown in fig. 8, the hairpin conductor group includes 3 hairpin conductors, one of which is a wave conductor with two legs deflected and bent in the width direction of the hairpin body in the opposite direction, as shown in fig. 6, and the other two of which are O-shaped conductors having an overall annular shape, as shown in fig. 7, the two legs of the O-shaped conductor are deflected and bent toward the middle in the width direction of the hairpin body and are arranged at intervals in a staggered manner in the thickness direction of the hairpin body; the two O-shaped conductors are positioned at the same magnetic pole position in the radial direction of the stator and are connected with the wave-shaped conductors in the circumferential direction of the stator core; one leg of the wave-shaped conductor is connected with one leg of one O-shaped conductor in a welding mode, the other leg of the O-shaped conductor is connected with the leg of the other O-shaped conductor in a welding mode, and the other leg of the wave-shaped conductor is connected with one leg of the O-shaped conductor on the other adjacent hairpin conductor group in a welding mode.

In this embodiment, as shown in fig. 5, 8, 12 and 13, on the same hairpin conductor group, two leg portions of the wave-shaped conductor are respectively located at the 1 st layer and the 6 th layer (i.e., the 1 st layer and the 2h +2 nd layer, H = 2) in the stator slot where the wave-shaped conductor is located, two leg portions of one O-shaped conductor are respectively located at the 2 nd layer and the 4 th layer (i.e., the a-th layer and the a + H layer, a =2, H = 2) in the stator slot where the wave-shaped conductor is located, and two leg portions of the other O-shaped conductor are respectively located at the 3 rd layer and the 5 th layer (i.e., the a-th layer and the a + H layer, a =3, H = 2) in the stator slot where the wave-shaped conductor is located.

For convenience of illustration, as shown in fig. 14, taking the coil loop group a as an example, in the coil loop group a, the leg portions of two O-shaped conductors on the hairpin conductor group located on the coil loop a1 are located on the second layer and the third layer of the k +1 th slot, and the leg portion of the wave-shaped conductor on the hairpin conductor group is located on the sixth layer of the k +2 th slot; the leg parts of two O-shaped conductors on the adjacent hairpin conductor group positioned on the coil loop a2 are positioned on the second layer and the third layer of the k +2 slot, and the leg part of the wave-shaped conductor on the hairpin conductor group is positioned on the sixth layer of the k +3 slot; the first layer in the k +1 slot and the k +2 slot is filled with the leg portions of the wave conductors on the coil loops b1 and b2, respectively, and the fourth layer and the fifth layer in the k +2 slot and the fourth layer and the fifth layer in the k +3 slot are filled with the leg portions of the two O-shaped conductors on the coil loops b1 and b2, respectively. In this way, in each pole, the slot position located in the middle (i.e., the k +2 slot) is completely filled with the leg portion of the hairpin conductor belonging to the same phase, and the slot positions located on both sides of the slot (i.e., the k +1 slot and the k +3 slot) are filled with the leg portion of the hairpin conductor belonging to the phase only in a half of the slot close to the inner layer or the outer layer of the stator, and the other half is filled with the leg portion of the hairpin conductor belonging to the adjacent other phase winding, as shown in fig. 14. Only one surface of each two adjacent phase windings in the same stator core slot is close to each other, so that the adjoining area of conductors between different phases in the same slot is reduced, the probability of interphase discharge is favorably reduced, and the service life of the motor is prolonged. In addition, as can be seen from fig. 1, the arrangement of the hairpin conductors is more orderly and the structural arrangement is more reasonable by adopting the scheme of the invention.

Example 2:

as shown in fig. 15 to 25, in this embodiment, K =2, which is that each phase winding includes two coil loop groups each including 2 coil loops, a and b, respectively, as in embodiment 1; the coil ring group a comprises a coil ring a1 and a coil ring a2 which are sequentially arranged in the clockwise direction, and the coil ring a1 and the coil ring a2 are positioned in two circumferentially continuous adjacent slots of the stator. The coil ring group b comprises a coil ring b1 and a coil ring b2 which are sequentially arranged in the clockwise direction, and the coil ring b1 and the coil ring b2 are also positioned in two circumferentially continuous adjacent slots of the stator.

As shown in fig. 20, the coil loop group a includes a coil loop a1 and a coil loop a2 which are sequentially arranged in a clockwise direction; as shown in fig. 21, the coil loop group b includes a coil loop b1 and a coil loop b2 which are sequentially arranged in a clockwise direction.

In this embodiment, the number of pole pairs P =4, that is, each of the coil loop a1, the coil loop a2, the coil loop b1, and the coil loop b2 is formed by connecting in series 4 hairpin conductor sets uniformly distributed along the circumferential direction of the stator core, as shown in fig. 15 and 16.

The hairpin conductor group comprises two groups of hairpin conductors which are arranged in a splicing manner in the circumferential direction of the stator core, wherein one group of hairpin conductors comprises a wave conductor and J first type of U-shaped conductors, the other group of hairpin conductors comprises an O-shaped conductor and J second type of U-shaped conductors which are annular integrally, and H =2J +1; the two support legs of the corrugated conductor deflect and bend along the opposite direction in the width direction of the hairpin main body; the two support legs of the O-shaped conductor deflect and bend towards the middle part in the width direction of the hairpin main body and are arranged at intervals in a staggered manner in the thickness direction of the hairpin main body; as shown in fig. 17, both legs of the first type of U-shaped conductors are bent toward the second type of U-shaped conductors, and as shown in fig. 18, both legs of the second type of U-shaped conductors are bent toward the first type of U-shaped conductors.

In the present embodiment, as shown in fig. 19, H =3,j =1, the two leg portions of the wave-shaped conductor are respectively located at the 1 st layer and the 8 th layer (i.e., the 1 st layer and the 2h +2 nd layer, H = 3) in the stator slot where the wave-shaped conductor is located, and the two leg portions of the first type of skewed U-shaped conductor are respectively located at the 3 rd layer and the 6 th layer (i.e., the a-th layer and the a + H layer, a =3,h = 3) in the stator slot where the wave-shaped conductor is located; the two leg portions of the second type of the eccentric U-shaped conductor are respectively located at the 4 th layer and the 7 th layer (i.e., the a-th layer and the a + H layer, a =4, H = 3) in the stator slot where the second type of the eccentric U-shaped conductor is located, and the two leg portions of the O-shaped conductor are respectively located at the 2 nd layer and the 5 th layer (i.e., the a-th layer and the a + H layer, a =2, H = 3) in the stator slot where the second type of the eccentric U-shaped conductor is located.

For convenience of description, as shown in fig. 25, taking the coil loop group a as an example, in the coil loop group a, the leg portions of the wave-shaped conductors on the hairpin conductor group located on the coil loop a1 are located in the eighth layer of the k +2 th slot, and the leg portions of the other hairpin conductors are located in the second layer, the third layer and the fourth layer of the k +1 th slot; the leg parts of the wave-shaped conductors on the hairpin conductor group positioned on the coil loop a2 adjacent to the coil loop are positioned on the eighth layer of the k +3 th slot, and the leg parts of other hairpin conductors are positioned on the second layer, the third layer and the fourth layer of the k +2 th slot; the first layers in the k +1 slot and the k +2 slot are filled with the leg portions of the wave conductors on the coil loops b1 and b2, respectively, and the fifth layer, the sixth layer and the seventh layer in the k +2 slot and the fifth layer, the sixth layer and the seventh layer in the k +3 slot are filled with the leg portions of the other hairpin conductors on the coil loops b1 and b2, respectively. In this way, in each pole, the slot position located in the middle (i.e., k +2 slot) is completely filled with the leg portion of the hairpin conductor belonging to the same phase, and the slot positions located on both sides of the slot (i.e., k +1 slot and k +3 slot) are filled with only half of the slots close to the inner layer or the outer layer of the stator and the other half of the slots are filled with the leg portion of the hairpin conductor belonging to the adjacent other phase winding, as shown in fig. 25. Only one surface of each two adjacent phase windings in the same stator core slot is close to each other, so that the adjoining area of conductors between different phases in the same slot is reduced, the probability of interphase discharge is favorably reduced, and the service life of the motor is prolonged.

In addition to the above embodiments, in specific implementation, the hairpin conductor set may also have the following structure:

when H =2, the hairpin conductor group includes 3 hairpin conductors, one of which is an O-shaped conductor in an annular shape as a whole, and the other two conductors are a first type of offset U-shaped conductor and a second type of offset U-shaped conductor which are arranged side by side in the radial direction of the stator, the leg on one leg portion of the first type of offset U-shaped conductor and the leg on the other leg portion of the second type of offset U-shaped conductor are deflected and bent in the direction away from each other in the width direction of the hairpin body, and the other two legs of the two are bent and welded in the width direction of the hairpin body; the two support legs of the O-shaped conductor deflect and bend towards the middle part in the width direction of the hairpin main body and are arranged at intervals in a staggered manner in the thickness direction of the hairpin main body; the O-shaped conductor, the first type of inclined U-shaped conductor and the second type of inclined U-shaped conductor are connected in the circumferential direction of the stator core; two leg parts of the O-shaped conductor are respectively positioned on the 1 st layer and the 6 th layer in the stator slot where the O-shaped conductor is positioned, one leg of the O-shaped conductor is connected with one leg of the first type of inclined U-shaped conductor or the second type of inclined U-shaped conductor in a welding mode, and the other leg of the O-shaped conductor is connected with one leg of the second type of inclined U-shaped conductor or the first type of inclined U-shaped conductor on the other adjacent hairpin conductor group in a welding mode.

When H =3, the two leg parts of the O-shaped conductor are respectively positioned on the 1 st layer and the 8 th layer in the stator slot where the O-shaped conductor is positioned, and the two leg parts of the second type of the eccentric U-shaped conductor are respectively positioned on the 3 rd layer and the 6 th layer in the stator slot where the O-shaped conductor is positioned; the two leg parts of the wave-shaped conductor are respectively positioned on the 2 nd layer and the 5 th layer in the stator slot where the wave-shaped conductor is positioned, and the two leg parts of the first type of inclined U-shaped conductor are respectively positioned on the 4 th layer and the 7 th layer in the stator slot where the wave-shaped conductor is positioned.

The above description is only exemplary of the present invention and should not be taken as limiting, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An outer wrapping type stator assembly comprises a cylindrical stator core, wherein a plurality of stator slots are uniformly distributed along the circumferential direction of the stator core, and stator windings are arranged in the stator slots; the motor is characterized in that each phase of winding of the stator winding comprises two groups of coil ring groups which are staggered with Y stator slot positions in the circumferential direction of the stator core, and Y is a pole pitch; each coil ring group comprises K coil rings which are sequentially staggered by one stator slot position in the circumferential direction of the stator core, and K is more than or equal to 2; the coil ring is formed by connecting P hairpin conductor groups uniformly distributed along the circumferential direction of the stator in series, and P is the number of magnetic pole pairs; the hairpin conductor group comprises 1+ H hairpin conductors, wherein H is 2 or an odd number larger than 2; the hairpin conductor comprises a hairpin main body which is bent integrally in a U shape, the hairpin main body comprises two leg parts which are arranged in parallel and heads which are connected to one ends of the two leg parts, and the other ends of the two leg parts are respectively provided with a supporting leg; in the hairpin conductor group, two leg parts of one hairpin conductor are respectively positioned on the 1 st layer and the 2H +2 nd layer in the stator slot where the hairpin conductor is positioned, and two leg parts of other hairpin conductors are respectively positioned on the A-th layer and the A + H-th layer in the stator slot where the hairpin conductor is positioned, wherein A is more than 1 and is not more than H +1.

2. The outer clad stator assembly of claim 1 wherein said hairpin conductors have a pitch of Y-1, Y being the pole pitch; the hairpin conductor group comprises two groups of hairpin conductors which are respectively arranged at two magnetic pole positions adjacent to the circumferential direction of the stator core, and in the same hairpin conductor group, in the circumferential direction of the stator core, the leg parts which are close to one side of the hairpin conductors are respectively positioned in two adjacent stator slots and are mutually connected.

3. The outer stator assembly of claim 1 or 2 wherein H =2, the set of hairpin conductors comprises 3 hairpin conductors, one of which is a wave-shaped conductor with two legs bent in a direction away from each other in the width direction of the hairpin body, and the other two are O-shaped conductors having an overall annular shape, and the two legs of the O-shaped conductor are bent in a direction toward the middle in the width direction of the hairpin body and are arranged at staggered intervals in the thickness direction of the hairpin body; the two O-shaped conductors are positioned at the same magnetic pole position in the radial direction of the stator and are connected with the wave-shaped conductors in the circumferential direction of the stator core; one leg of the wave-shaped conductor is connected with one leg of one O-shaped conductor in a welding mode, the other leg of the O-shaped conductor is connected with the leg of the other O-shaped conductor in a welding mode, and the other leg of the wave-shaped conductor is connected with one leg of the O-shaped conductor on the other adjacent hairpin conductor group in a welding mode.

4. The outer clad stator assembly of claim 1 or 2 wherein H =2, the set of hairpin conductors comprises 3 hairpin conductors, one of which is an O-shaped conductor having a ring shape as a whole, and the other two conductors are a first type of offset U-shaped conductor and a second type of offset U-shaped conductor arranged side by side in the radial direction of the stator, the leg on one leg portion of the first type of offset U-shaped conductor and the leg on the other leg portion of the second type of offset U-shaped conductor are bent in a direction deviating away from each other in the width direction of the hairpin body, and the other two legs are bent toward each other in the width direction of the hairpin body and are welded together; the two support legs of the O-shaped conductor deflect and bend towards the middle part in the width direction of the hairpin main body and are arranged at intervals in a staggered manner in the thickness direction of the hairpin main body; the O-shaped conductor, the first type of inclined U-shaped conductor and the second type of inclined U-shaped conductor are connected in the circumferential direction of the stator core; two leg parts of the O-shaped conductor are respectively positioned on the 1 st layer and the 6 th layer in the stator slot where the O-shaped conductor is positioned, one leg of the O-shaped conductor is connected with one leg of the first type of inclined U-shaped conductor or the second type of inclined U-shaped conductor in a welding mode, and the other leg of the O-shaped conductor is connected with one leg of the second type of inclined U-shaped conductor or the first type of inclined U-shaped conductor on the other adjacent hairpin conductor group in a welding mode.

5. The outer wrapped stator assembly of claim 1 or 2 wherein, when H is an odd number greater than 2, said set of hairpin conductors comprises two sets of hairpin conductors arranged in circumferential abutment on the stator core, wherein one set of hairpin conductors comprises one wave conductor and J first type of U-shaped conductors, and the other set of hairpin conductors comprises one O-shaped conductor and J second type of U-shaped conductors, which are annular in shape as a whole, H =2j +1; the two support legs of the corrugated conductor deflect and bend along the opposite direction in the width direction of the hairpin main body; the two support legs of the O-shaped conductor deflect and bend towards the middle part in the width direction of the hairpin body and are arranged at intervals in a staggered manner in the thickness direction of the hairpin body; the two support legs of the first type of the inclined U-shaped conductor deflect and bend towards the second type of the inclined U-shaped conductor, and the two support legs of the second type of the inclined U-shaped conductor deflect and bend towards the first type of the inclined U-shaped conductor.

6. The overclad stator assembly of claim 5, wherein H =3, the two leg portions of the wave conductor are respectively located at layers 1 and 8 within the respective stator slot, and the two leg portions of the first type of offset U-shaped conductor are respectively located at layers 3 and 6 within the respective stator slot; two leg parts of the second type of the eccentric U-shaped conductor are respectively positioned on the 4 th layer and the 7 th layer in the stator slot where the second type of the eccentric U-shaped conductor is positioned, and two leg parts of the O-shaped conductor are respectively positioned on the 2 nd layer and the 5 th layer in the stator slot where the second type of the eccentric U-shaped conductor is positioned.

7. The overcladding stator assembly as recited in claim 5, wherein H =3, the two legs of the O-shaped conductor are respectively located at layers 1 and 8 in the respective stator slot, and the two legs of the second type of off-U-shaped conductor are respectively located at layers 3 and 6 in the respective stator slot; the two leg parts of the wave-shaped conductor are respectively positioned on the 2 nd layer and the 5 th layer in the stator slot where the wave-shaped conductor is positioned, and the two leg parts of the first type of inclined U-shaped conductor are respectively positioned on the 4 th layer and the 7 th layer in the stator slot where the wave-shaped conductor is positioned.

8. An electrical machine comprising an overwrapped stator assembly according to any of claims 1 to 7.