CN111564921A

CN111564921A - Motor stator and motor

Info

Publication number: CN111564921A
Application number: CN202010522201.3A
Authority: CN
Inventors: 刘延海; 柏荣键
Original assignee: Tianjin Santroll Electric Automobile Technology Co Ltd
Current assignee: Tianjin Santroll Electric Automobile Technology Co Ltd
Priority date: 2020-06-10
Filing date: 2020-06-10
Publication date: 2020-08-21

Abstract

The invention relates to the field of motors, and discloses a motor stator and a motor, which comprise: a stator core having a plurality of slots formed on a radially inner surface thereof and spaced apart at predetermined slot pitches in a circumferential direction of the stator core; a stator winding including a plurality of phase windings mounted on the stator core so as to be different from each other in electrical phase; the stator winding is three-phase, the number of slots of each phase of each pole is Q, the phase winding is provided with P poles, and two branch windings in each phase winding are sequentially connected in parallel along the circumferential direction of the stator core; the invention adopts a completely symmetrical structure on the magnetic circuit through the winding structure, eliminates the problem of circulating current generated by an asymmetrical structure, adopts fewer U-shaped conductors, simplifies the manufacturing procedure, reduces the production cost and improves the processing efficiency.

Description

Motor stator and motor

Technical Field

The invention relates to the field of motors, in particular to a motor stator and a motor.

Background

In the prior art, a stator winding comprises various conductors, the various conductors comprise U-shaped conductors, and coils of the various conductors penetrate into a slot of a stator core according to a certain arrangement mode to form a required single-phase winding or multi-phase winding of a motor. The hairpin coils used in the prior art are various, the manufacturing process is complex, the production cost is high, and the processing efficiency is low.

Disclosure of Invention

The invention provides a motor stator and a motor, wherein a completely symmetrical structure is adopted on a magnetic circuit through a winding structure, the problem of circulating current generated by an asymmetrical structure is solved, fewer U-shaped conductors are adopted, the manufacturing process is simplified, the production cost is reduced, and the processing efficiency is improved.

In order to achieve the purpose, the invention adopts the following technical scheme:

an electric machine stator comprising:

a stator core having a plurality of slots formed on a radially inner surface thereof and spaced apart at predetermined slot pitches in a circumferential direction of the stator core;

a stator winding including a plurality of phase windings mounted on the stator core so as to be different from each other in electrical phase;

the stator winding is three-phase, the number of slots of each phase of each pole is Q, the phase winding is provided with P poles, and two branch windings in each phase winding are sequentially connected in parallel along the circumferential direction of the stator core;

the stator winding includes: the plurality of plug terminals are positioned outside the stator iron core slots, the other ends of the plug terminals are connected with the insides of the two slots of the same U-shaped conductor, and the pitch between the insides of the slots corresponding to the plurality of plug terminals is a whole pitch;

the stator winding further includes: each connecting area part is formed by connecting one welding end of a first U-shaped conductor with one welding end of a second U-shaped conductor;

the 3 × Q × P connection region portions include:

a first connection region portion having a same pitch between two soldering terminals corresponding to a plurality of first connection portions,

the pitch between two welding ends corresponding to a plurality of second connecting parts of the second connecting region part is at least partially different from the pitch between two welding ends corresponding to a plurality of first connecting parts of the first connecting region part, and the number of the second connecting region parts is 3 × Q × 2;

and among the 3Q P connecting region parts, the extending direction of the welding end of the first connecting region part and the extending direction of the welding end of the second connecting region part which are positioned on the same layer in the radial direction of the stator core are the same, and the groove distances are the same.

Furthermore, the two branch windings of the phase winding of the stator winding have outgoing lines, the outgoing line of the first branch winding of the phase winding is located in the first 3 × Q second connection region portions, and the outgoing line of the second branch winding of the phase winding is located in the second 3 × Q second connection region portions.

Furthermore, each branch winding of the phase winding comprises N sub-branch windings, each sub-branch winding is positioned on one radial side of the stator core and sequentially connected with P/2 poles to the other radial side of the stator core in series along the circumferential direction of the stator core, the N sub-branch windings are positioned in 3 x Q second connection area parts and are connected in series along the radial direction of the stator core, and N is the same as Q.

Further, the N sub-branch windings of each branch winding in the phase winding are located in the Q circumferentially adjacent slots of the stator core.

Further, the lead wires of the two branch windings of the phase winding are positioned on the radially innermost side or the radially outermost side of the second connection region portion.

Furthermore, each slot is divided into M layers by the stator winding along the number of conductors in the slot which can be accommodated in the radial direction of the stator core, M is an even number which is more than or equal to 4, and the pitch between two welding ends corresponding to the plurality of first connecting parts of the first connecting area part is a whole pitch.

Further, when M is equal to 4, the pitch between the two welding terminals corresponding to the second connection portion of the second connection region portion is a long pitch.

Further, when M is greater than 4, the pitch between the two welding ends corresponding to only one second connecting portion in the second connecting region portion is a long pitch, and the second connecting portion may be located at any position in the radial direction of the second connecting region portion; the pitch between the two welding ends corresponding to the rest second connecting parts in the second connecting area is a whole pitch.

In order to achieve the above object, the present invention also provides a motor including the above motor stator.

By applying the technical scheme of the invention, the motor stator and the motor are as follows: a stator core having a plurality of slots formed on a radially inner surface thereof and spaced apart at predetermined slot pitches in a circumferential direction of the stator core; a stator winding including a plurality of phase windings mounted on the stator core so as to be different from each other in electrical phase; the stator winding is three-phase, the number of slots of each phase of each pole is Q, the phase winding is provided with P poles, and two branch windings in each phase winding are sequentially connected in parallel along the circumferential direction of the stator core; the stator winding includes: the plurality of plug terminals are positioned outside the stator iron core slots, the other ends of the plug terminals are connected with the insides of the two slots of the same U-shaped conductor, and the pitch between the insides of the slots corresponding to the plurality of plug terminals is a whole pitch; the stator winding further includes: each connecting area part is formed by connecting one welding end of a first U-shaped conductor with one welding end of a second U-shaped conductor; the 3 × Q × P connection region portions include: the pitch between two welding ends corresponding to a plurality of first connecting parts of the first connecting area part is the same, the pitch between two welding ends corresponding to a plurality of second connecting parts of the second connecting area part is at least partially different from the pitch between two welding ends corresponding to a plurality of first connecting parts of the first connecting area part, and the number of the second connecting area parts is 3 × Q × 2; and among the 3Q P connecting region parts, the extending direction of the welding end of the first connecting region part and the extending direction of the welding end of the second connecting region part which are positioned on the same layer in the radial direction of the stator core are the same, and the groove distances are the same. The winding structure adopts a completely symmetrical structure on a magnetic circuit, eliminates the problem of circulating current generated by an asymmetrical structure, adopts fewer U-shaped conductors, simplifies the manufacturing process, reduces the production cost and improves the processing efficiency.

Drawings

Fig. 1 is a schematic structural diagram of a stator of a motor according to a first embodiment of the present invention;

FIG. 2 is a schematic view of an axial side of a stator winding according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a stator of a motor according to a second embodiment of the present invention;

fig. 4 is a schematic view of a one-phase stator winding structure according to a second embodiment of the present invention;

FIG. 5 is a schematic view of the insulation paper in the slot of the stator of the first motor according to the embodiment of the present invention;

FIG. 6 is a schematic view of the insulation paper in the slot of the stator of the second motor in the embodiment of the invention;

FIG. 7 is a schematic view of insulation paper in a stator slot of a third motor according to an embodiment of the present invention;

FIG. 8 is a schematic view of an insulating paper in a slot of a stator of a fourth motor according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a U-shaped conductor structure in an embodiment of the invention;

FIG. 10 is a partial schematic structural view of two slots adjacent to each other in phase in an embodiment of the present invention;

fig. 11 is a plan development view of a stator winding of one phase in the third embodiment of the present invention;

FIG. 12 is a schematic diagram of an electrical connection in an embodiment of the present invention;

FIG. 13 is another electrical connection schematic in an embodiment of the present invention;

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

It should be noted that the terms "first", "second", and the like in the description and claims of the present invention and the accompanying drawings are used for distinguishing different objects, and are not used for limiting a specific order. The following embodiments of the present invention may be implemented individually, or in combination with each other, and the embodiments of the present invention are not limited in this respect.

In the figure, the extending direction of A1a2 is parallel to the axial direction of the stator core, 0102 is three directions which are drawn by way of example and extend along the radial direction of the stator core, and the pitch in the application is the interval between the inside of a groove corresponding to the welding end of one U-shaped conductor and the inside of a groove corresponding to the welding end of another U-shaped conductor along the circumferential direction, or the interval between the inside of two grooves of one U-shaped conductor along the circumferential direction; in the application, a plurality of connecting parts of the connecting region part are sequentially and adjacently arranged along the radial direction of the stator core, and the radial direction of the stator core is the same radial direction or is close to the same radial direction; it should be noted that the first layer is located in the radial direction of the stator core (i.e. the first layer in the direction close to the central axis of the stator core), and the mth layer is located in the radial direction of the stator core (i.e. the mth layer in the direction close to the central axis of the stator core); correspondingly, the first layer in the radial direction of the stator core (the first layer in the direction away from the central axis of the stator core is also possible) is positioned, and the Mth layer in the radial direction of the stator core (namely, the Mth layer in the direction away from the central axis of the stator core is positioned).

As shown in fig. 1, the present embodiment provides a motor stator including: a stator core 20 having a plurality of slots 21 formed on a radially inner surface thereof and spaced apart at predetermined slot pitches in a circumferential direction of the stator core;

as shown in fig. 1 to 2 and 3 to 4, the stator winding 10 includes a plurality of phase windings mounted on a stator core 20 so as to be different from each other in electrical phase, wherein two branch windings of each phase winding are connected in parallel in sequence in a circumferential direction of the stator core.

With reference to fig. 1 to 4, in the first and second embodiments, the stator winding 10 is mounted on the stator core 20, that is, a plurality of phase windings mounted on the stator core 20 so as to be different from each other in electrical phase, wherein the stator winding 10 is a three-phase (i.e., U-phase, V-phase, W-phase) winding, and the number Q of slots per pole per phase is greater than or equal to 2; two slots 21 are provided for each magnetic pole of the rotor, the number Q of slots per pole per phase is 2 in the present embodiment, the rotor has 12 (P is 12 in the first embodiment and the second embodiment) poles and is for each phase of the three-phase stator winding 10, the number of slots 21 provided in the stator core 20 is equal to 72 (i.e., 2X12X3), as shown in fig. 11, the number of poles in the stator winding is 8 in the third embodiment (P is 8 in the third embodiment), the number of corresponding slots 21 provided in the stator core 20 is equal to 48, the U1 branch winding and the U2 branch winding in the U-phase winding are sequentially connected in parallel in the circumferential direction of the stator core, the V1 branch winding and the V2 branch winding in the V-phase winding are sequentially connected in parallel in the circumferential direction of the stator core, and the W1 branch winding and the W2 branch winding in the W-phase are sequentially connected in parallel in the circumferential direction of the stator core; further, in the present embodiment, the stator core 20 is formed by stacking a plurality of annular magnetic steel plates to form the stator core axial direction both end faces 25, 26 of the stator core 20 by defining one tooth portion 22 by two adjacent slots 21, and other conventional metal plates may be used instead of the magnetic steel plates; as shown in fig. 1, 5, 6, 7, and 8, a plurality of insulating papers 30 are inserted into the magnetic steel plate slots 21, fig. 5 shows that the first type of in-slot insulating paper 30 in this embodiment is B-shaped insulating paper, fig. 6 shows that the second type of in-slot insulating paper 30 in this embodiment is double-mouth-shaped insulating paper, fig. 7 shows that the third type of in-slot insulating paper 30 in this embodiment is large S-shaped insulating paper, in this embodiment, any one of the three types of in-slot insulating paper can be selected to isolate the inter-phase conductors in the slots 21, and fig. 8 shows that the fourth type of in-slot insulating paper 30 in this embodiment is single large-mouth-shaped paper, when the conductor insulation is selected to be thicker, the isolation is not required in the middle, and the fourth type of in-slot insulating paper 30 can be used.

With reference to fig. 1 to 11, in the embodiment, the stator winding 10 includes 48 connection region portions 110(120), (in the first embodiment and the second embodiment, the stator winding 10 includes 72 connection region portions 110(120)), so that it can be seen that the number of the connection region portions is related to the number of slots, poles, and phases per pole of the motor, and in the present embodiment, the connection region portions include: the 4 first connecting portions 210 (or the 3 second connecting portions 220) are sequentially located at the stator core slot outer end 26 along the radial direction of the stator core 20, and each U-shaped conductor 200 includes: the two slot interiors 301 are positioned in two slots of the stator core at a specified slot pitch, the other end of the stator core outside the slot 25 is connected with the plug wire ends of the two slot interiors 301, the end 26 of the stator core outside the slot is connected with two welding ends 303, and each first connecting part 210 (second connecting part 220) is formed by connecting one welding end 303 of a first U-shaped conductor 200 with one welding end 303 of a second U-shaped conductor 200;

with reference to fig. 1 to 11, in the present embodiment, 48 (72) connection region portions in the stator winding include: 36 (60) first connection region parts 110, where the first connection region parts 110 include 4 first connection parts 210-1 (located at the eighth and seventh radial layers of the stator core), 210-2 (located at the sixth and fifth radial layers of the stator core), 210-3 (located at the fourth and third radial layers of the stator core), 210-4 (located at the second and first radial layers of the stator core) sequentially from the outer radial side of the stator core to the inner radial side of the stator core, and the pitches between the two welding ends corresponding to the 4 first connection parts of the first connection region parts 110 are the same and are the same as a whole pitch;

specifically, with reference to fig. 1 to 11, two slot interiors 301 corresponding to the first connection portion 210-1 of any one first connection region portion 110 and connecting two welding terminals 303 are located in the 13 th slot of the seventh layer of the stator core and the 7 th slot of the eighth layer of the stator core, two slot interiors 301 corresponding to the second first connection portion 210-2 and connecting two welding terminals 303 are located in the 13 th slot of the fifth layer of the stator core and the 7 th slot of the sixth layer of the stator core, two slot interiors 301 corresponding to the third first connection portion 210-3 and connecting two welding terminals 303 are located in the 13 th slot of the third layer of the stator core and the 7 th slot of the fourth layer of the stator core, two slot interiors 301 corresponding to the fourth first connection portion 210-4 and connecting two welding terminals 303 are located in the 13 th slot of the first layer of the stator core and the 7 th slot of the second layer of the stator core, and it can be seen that the 4 first connection portions 210 of the first connection region portion 110 correspond to the joints between the two slot interiors 301 of the two welding terminals 303 The distances are the same and are all integral pitches; as shown in fig. 11, the positions of the 4 first connection portions 210 of the remaining 35 first connection region portions 110 are the same as the pitch of the two groove interiors 301 corresponding to the 4 first connection portions 210 of the first connection region portion 110 and connecting the two welding ends 303, which is not described herein again; it should be noted that the number of connection portions in each connection region portion in this embodiment is related to the number of conductors in the slots that can be accommodated by the stator winding in the radial direction of the stator core, and the number of conductors in the slots that can be accommodated by the stator winding in the radial direction of the stator core in this embodiment is 8 (M is 8 in this embodiment).

With reference to fig. 1 to 11, in the present embodiment, 48 (72) connection region portions in the stator winding include: 12 second connection region parts 120, the second connection region part 120 includes 3 second connection parts 220-1, 220-2, 220-3, the pitch between two welding terminals (located at the seventh layer and the sixth layer in the radial direction of the stator core) corresponding to the first second connection part 220-1 among the 3 second connection parts of the second connection region part 120 is a whole pitch, the pitch between two welding terminals (located at the fifth layer and the fourth layer in the radial direction of the stator core) corresponding to the second connection part 220-2 is a long pitch, the pitch between two welding terminals (located at the third layer and the second layer in the radial direction of the stator core) corresponding to the third second connection part 220-3 is a whole pitch, at this time, the pitch between two welding terminals corresponding to one second connection part 220-2 among the second connection region parts is a long pitch, the pitch between the two welding ends corresponding to the rest of the connection parts in the second connection region is a full pitch (in the embodiment, the full pitch is 6); of course, one of the second connection regions corresponding to two welding ends may be a long-pitch connection portion located at two welding ends (located at the seventh and sixth radial layers of the stator core) corresponding to the first second connection portion 220-1, two welding ends (located at the fifth and fourth radial layers of the stator core) corresponding to the other second connection portions 220-2 may be a full-pitch connection portion, and two welding ends (located at the third and second radial layers of the stator core) corresponding to the third second connection portion 220-3 may be a full-pitch connection portion; of course, the connection portion having one of the second connection regions corresponding to two of the welding ends with a long pitch may be located at the third second connection portion 220-3 (located at the third layer and the second layer in the radial direction of the stator core), and the two welding ends corresponding to the remaining second connection portions in the second connection region may be at a full pitch.

Specifically, referring to fig. 1 to 11, the two slot interiors 301 corresponding to the first second connection portion 220-1 of any one of the second connection region portions 120 and connecting the two welding terminals 303 are located at the 1 st slot of the seventh layer of the stator core and the 43 th slot of the sixth layer of the stator core, the two slot interiors 301 corresponding to the second connection portion 220-2 and connecting the two welding terminals 303 are located at the 1 st slot of the fifth layer of the stator core and the 42 th slot of the fourth layer of the stator core, the two slot interiors 301 corresponding to the third second connection portion 220-3 and connecting the two welding terminals 303 are located at the 1 st slot of the third layer of the stator core and the 43 th slot of the second layer of the stator core, and it can be seen that the first second connection portion 220-1 and the third second connection portion 220-3 of the second connection region portion 120 have the same pitch as the two welding terminals corresponding to the 4 first connection portions 210 of the first connection region portion 110, the pitch between the two welding terminals corresponding to the second connecting portion 220-2 of the second connecting region portion 120 is different from the pitch between the two welding terminals corresponding to the 4 first connecting portions 210 of the first connecting region portion 110, and the number of the second connecting region portions in 48 (72) connecting region portions is 12, that is, the number Q of slots per pole per phase is 2, the number of poles in each phase winding is 2, the stator winding is three-phase, it should be noted that the 12 connecting region portions may be located at circumferentially adjacent positions of the stator core, or may be separately located.

With reference to fig. 1 to 11, in the present embodiment, the pitch of the inside of the slot 301 corresponding to the 4 plug terminals 302 of the stator winding including the 48 connection regions is a full pitch, and when M is 8, the pitch of the inside of the slot 301 corresponding to the 4 plug terminals 302 of the stator winding including the 48 connection regions is a full pitch.

Illustratively, as shown in fig. 1 to 11, in the present embodiment, of the 48 connection region portions (72 connection region portions), the welding end of the first connection region portion 110 located at the second layer in the radial direction of the stator core and the welding end of the second connection region portion 120 all extend in the same direction to the right, and the slot pitches all are 3.5 slot pitches, the welding end of the first connection region portion 110 located at the third layer in the radial direction of the stator core and the welding end of the second connection region portion 120 all extend in the same direction to the left, and the slot pitches all extend in 2.5 slot pitches, the welding end of the first connection region portion 110 located at the fourth layer in the radial direction of the stator core and the welding end of the second connection region portion 120 all extend in the same direction to the right, and the slot pitches all extend in 3.5 slot pitches, the welding end of the first connection region portion 110 located at the fifth layer in the radial direction of the stator core and the welding end of the second connection region portion 120 all extend in the same direction to the left, and the slot pitches are 3.5 slot pitches, the extending directions of the welding end of the first connecting area part 110 positioned on the radial sixth layer of the stator core and the welding end of the second connecting area part 120 are the same and extend rightwards, the slot pitches are 2.5 slot pitches, the extending directions of the welding end of the first connecting area part 110 positioned on the radial seventh layer of the stator core and the welding end of the second connecting area part 120 are the same and extend leftwards, and the slot pitches are 3.5 slot pitches, therefore, the extending directions of the welding end of the first connecting area part positioned on the radial same layer of the stator core and the welding end of the second connecting area part in 48 connecting area parts are the same and the slot pitches are the same. The winding structure adopts a completely symmetrical structure on a magnetic circuit, eliminates the problem of circulating current generated by an asymmetrical structure, adopts fewer U-shaped conductors, simplifies the manufacturing process, reduces the production cost and improves the processing efficiency.

As shown in fig. 4, in the embodiment, the lead wires of the two branch windings U1 and U2 of the phase winding (U phase is taken as an example) of the stator winding 10 are respectively located in the 6 second connection region portions 120 of the first (Q1) of the lead wires (the wire inlet end and the wire outlet end) of the first branch winding U1 of the phase winding U, and the lead wires (the wire inlet end and the wire outlet end) of the second branch winding U2 of the phase winding U are respectively located in the 6 second connection region portions 120 of the second (Q2), and the number of slots per pole and per phase in the embodiment is 2, that is, Q is 2;

exemplarily, as shown in fig. 4, in the second implementation, the first branch winding of the phase winding U includes 2 sub-branch windings, two sub-branch windings U1A, U3A of the first branch winding are located on the radial outer side of the stator core (i.e., on the side away from the central axis direction) and are sequentially connected in series with P/2-pole number coils to the radial inner side of the stator core (i.e., on the side close to the central axis direction) along the circumferential direction of the stator core, and P is 12, that is, the U1 sub-branch winding is sequentially connected in series from the radially outermost side (eighth layer) U1A of the stator core to the tail U1B of the radially innermost side (first layer) of the stator core from the U-shaped conductor 200 of the q 2-pole number coil, the q 4-pole number coil, the q 6-pole number coil, the q 8-pole number coil, the q 10-pole number coil; the U3 sub-branch winding is also formed by sequentially connecting the U-shaped conductors 200 of a q2 pole number coil, a q4 pole number coil, a q6 pole number coil, a q8 pole number coil, a q10 pole number coil and a q12 pole number coil in series from the radially outermost side (eighth layer) U3A of the stator core to the tail U3B of the radially innermost side (first layer) of the stator core along the circumferential direction of the stator core; the first sub-branch winding is positioned in 6 second connection region parts of q1, the tail part U1B of the first sub-branch winding, which is positioned on the first radial layer of the stator core, is radially connected with the head part U3A of the second sub-branch winding, which is positioned on the eighth radial layer of the stator core, and the tail part U3B of the second sub-branch winding, which is positioned on the first radial layer of the stator core, radially extends to the outermost side (eighth layer) of the stator core to be connected in an alternate mode;

as shown in fig. 4, in the second embodiment, the second branch winding of the phase winding U includes 2 sub-branch windings, U2A, U4A of the 2 sub-branch windings of the second branch winding are located on the radially inner side (i.e., on the side close to the axial direction) of the stator core, and are sequentially connected in series with P/2-pole coils to the radially inner side (i.e., on the side close to the central axial direction) of the stator core along the circumferential direction of the stator core, and P is 12, that is, the U2 sub-branch winding is located in series from the radially innermost side (first layer) U2A of the stator core along the circumferential direction of the stator core, and is located in series from the U-shaped conductor 200 of the q 45-pole coil, the q 11-pole coil, the q 9-pole coil, the q 7-pole coil, q 5-pole coil, and q 23-pole coil to the tail portion U; the U4 sub-branch winding is also formed by sequentially connecting the U-shaped conductors 200 of a q 1-pole coil, a q 11-pole coil, a q 9-pole coil, a q 7-pole coil, a q 5-pole coil and a q 3-pole coil in series from the radially innermost side (the first layer) of the stator core to the tail U4B of the radially outermost side (the eighth layer) of the stator core along the circumferential direction of the stator core; the first sub-branch winding is located in 6 second connection region portions of q2, the head portion U4A of the second sub-branch winding, located in the first radial layer of the stator core, is radially connected with the tail portion U2B of the first sub-branch winding, located in the eighth radial layer of the stator core, and the second sub-branch winding is located in the tail portion U4B of the eighth radial layer of the stator core and is connected in an interphase mode; that is, 2 sub-branch windings of the second branch winding are located in 6 second connection region portions of q2 and are connected in series along the radial direction of the stator core, that is, a P/2 number of poles of the plurality of sub-branch windings of the first branch winding of the phase which are sequentially connected in series along the circumferential direction of the stator core is different from a P/2 number of poles of the plurality of sub-branch windings of the second branch winding of the phase which are sequentially connected in series along the circumferential direction of the stator core; the U1 and U3 sub-branch windings in the two sub-branch windings of the first branch winding in the U-phase winding are positioned in 2 circumferentially adjacent slots of the stator core, the U2 and U4 sub-branch windings in the two sub-branch windings of the second branch winding are positioned on the radial outer side of the stator core and in the 2 circumferentially adjacent slots of the stator core, in the embodiment, N is 2, and Q is 2;

further, the lead wires (including lead terminals and lead terminals) of the two branch windings U1 and U2 in each phase winding of the stator winding may be located on the radially innermost side (first layer) of the second connection region portion 120, or may be located on the radially outermost side (eighth layer) of the second connection region portion 120.

In the fourth embodiment, the number of the stator windings 10 in the slots that can be accommodated in the radial direction of the stator core 20 is 4 (M is 4 in the present embodiment), and the 48 (72) connection region portions in the stator windings include: 36 (60) first connection area parts 110, where the first connection area part 110 includes a first connection part 210-1 (located at a first layer and a second layer in the radial direction of the stator core), a second first connection part 210-2 (located at a third layer and a fourth layer in the radial direction of the stator core), and two welding ends that sequentially face the radial inner side of the stator core along the radial outer side of the stator core and correspond to the 2 connection parts of the first connection area part 110 have the same pitch, which is a whole pitch; the 48 connection region portions in the stator winding include: 12 second connection region parts 120, the second connection region parts 120 including 1 second connection part 220-1 (located at the second layer and the third layer in the radial direction of the stator core), the pitch between the two welding terminals corresponding to the second connection part 220-1 of the second connection region part being a long pitch, and thus it can be seen that the pitch between the two welding terminals corresponding to the second connection part 220 of the second connection region part 120 is different from the pitch between the two welding terminals corresponding to the 2 first connection parts 210 of the first connection region part 110; as can be seen, the pitch between the two welding terminals corresponding to 1 second connection portion of the second connection region portion 120 is different from the pitch between the two welding terminals corresponding to 2 first connection portions of the first connection region portion 110.

Illustratively, as shown in fig. 12, U-phase conductor lead terminals have U-phase terminals U1 and U2, V-phase conductor lead terminals have V-phase terminals V1 and V2, W-phase conductor lead terminals have W-phase terminals W1 and W2, U-phase conductor lead terminals U3 and U4, V-phase conductor lead terminals V3 and V4, and W-phase conductor lead terminals W3 and W4 use connectors to perform neutral point connection, i.e., a star connection of parallel windings of 2-phase of the motor is completed, as shown in fig. 13, U-phase conductor lead terminals U1 and U2 connect W-phase conductor lead terminals W3 and W4, W-phase conductor lead terminals W1 and W2 connect V-phase conductor lead terminals V3 and V4, V-phase conductor lead terminals V1 and V2 connect U-phase conductor lead terminals U3 and U4, i.e., a delta connection of parallel windings of 2-phase of the motor is completed.

The embodiment also provides a motor, which comprises the motor stator, and the motor adopting the motor stator can reduce the production cost and improve the production efficiency.

In the present invention, the number of slots per phase per pole is equal to the number of stator slots/number of motor poles/number of phases, and the pole pitch is equal to the number of slots per phase per pole/number of motor poles, and the number of slots is not limited to 48 slots, but may be other numbers of slots, for example: the number of slots per phase per pole is not limited to 2, 3, etc., and is not limited to one.

The motor provided by the embodiment of the present invention includes the motor stator in the above embodiment, and therefore, the motor provided by the embodiment of the present invention also has the beneficial effects described in the above embodiment, and details are not described herein again.

In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the connection may be mechanical or electrical, may be direct, may be indirect via an intermediate medium (bus connection), or may be communication between the two components. Those skilled in the art will understand what is specifically meant by the present invention. Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention and the technical principles applied.

It will be understood by those skilled in the art that the present invention is not limited to the embodiments illustrated herein, and that various obvious changes, rearrangements and substitutions may be made therein by those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An electric machine stator comprising:

a stator winding including a plurality of phase windings mounted on the stator core so as to be different in electrical phase from each other;

the stator winding includes: the plurality of plug terminals are positioned outside the stator iron core slots, the other ends of the plug terminals are connected with the insides of two slots of the same U-shaped conductor, and the pitches among the insides of the slots corresponding to the plurality of plug terminals are full pitches;

the 3 × Q × P connection region portions include:

a second connection region portion, wherein the pitch between two welding terminals corresponding to a plurality of second connection portions of the second connection region portion is at least partially different from the pitch between two welding terminals corresponding to a plurality of first connection portions of the first connection region portion, and the number of the second connection region portions is 3 × Q × 2;

and among the 3Q P connecting area parts, the extending directions of the welding ends of the first connecting area part and the second connecting area part which are positioned on the same layer in the radial direction of the stator core are the same, and the groove distances are the same.

2. The electric machine stator according to claim 1, wherein two branch windings of the phase windings of the stator winding have lead-out wires, the lead-out wires of a first branch winding of the phase windings are located in a first 3 × Q of the second connection region portions, and the lead-out wires of a second branch winding of the phase windings are located in a second 3 × Q of the second connection region portions.

3. The stator according to claim 2, wherein each branch winding of the phase winding includes N sub-branch windings, each sub-branch winding is located on one radial side of the stator core and sequentially connected in series with P/2 poles to the other radial side of the stator core along a circumferential direction of the stator core, the N sub-branch windings are located in 3 × Q second connection region portions and connected in series along the radial direction of the stator core, and N and Q are the same.

4. The electric machine stator of claim 3, wherein the N sub-branch windings of each of the phase windings are located in Q circumferentially adjacent slots of the stator core.

5. The motor stator according to claim 2, wherein the lead-out wires of the two branch windings of the phase winding are located radially innermost or radially outermost of the second connection region portion.

6. The stator according to claim 1, wherein the number of conductors in slots that can be received in the radial direction of the stator core by the stator winding divides each slot into M layers, M is an even number equal to or greater than 4, and a pitch between two welding terminals corresponding to the plurality of first connection portions of the first connection region portion is a full pitch.

7. The stator according to claim 6, wherein when M is equal to 4, a pitch between two welding ends corresponding to the second connection portion of the second connection region portion is a long pitch.

8. The stator of claim 6, wherein when M is greater than 4, the pitch between the two welding ends corresponding to only one second connecting portion in the second connecting region is long, and the second connecting portion can be located at any position in the radial direction of the second connecting region; the pitch between the two welding ends corresponding to the rest second connecting parts in the second connecting area is a whole pitch.

9. An electrical machine comprising an electrical machine stator according to any one of claims 1 to 8.