Stator assembly and electric machine

Abstract

The embodiment of the application relates to a kind of stator assembly and motor, in the branch of each phase winding of the stator assembly, first coil group is gradually wound to the Mth slot layer in the first direction with span y across layer;With span y1=y+2 or y1=y-2, the first coil group is wound to the Mth slot layer corresponding to adjacent magnetic pole with layer;With span y, the first coil group is gradually wound to the 1st slot layer in the second direction across layer;With span y2=2y-y1, the first coil group is wound to the 1st slot layer corresponding to adjacent magnetic pole with layer;Same layer connecting line is connected with span y3 first coil group and second coil group;Second coil group enters from the 1st slot layer, and first coil group is wound in the circumferential direction of stator core in adjacent two slot layers with span y in the first direction for a week;Again, the next group of adjacent two slot layers are crossed to be wound in the circumferential direction of stator core in the first direction with span y for a week;With this winding rule, until M / 2 group of adjacent two slot layers are wound to the Mth slot layer. The stator assembly cancels the insulating paper in the stator slot.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application belongs to the technical field of electric machines, and particularly relates to a stator assembly and an electric machine. BACKGROUND

[0002] Electric vehicles have advantages in power performance, intelligence, and use cost compared with traditional fuel vehicles, but the long charging time limits the promotion of electric vehicles. In order to solve the problem of long charging time of electric vehicles and to improve the power density of the drive system of electric vehicles, the drive motor is usually a flat wire motor. The stator assembly of the flat wire motor includes a stator core and a multi-phase winding. The stator core is circumferentially distributed with a plurality of stator slots, and each stator slot is provided with a plurality of layers of conductors constituting the multi-phase winding.

[0003] In the related art, the multi-phase winding in the stator assembly is usually a short-pitch winding, so that the multiple layers of conductors in the same slot are located in different phases. Therefore, an insulating paper needs to be arranged between the conductors in different phases in the same stator slot to isolate the conductors in different phases by the insulating paper.

[0004] However, the insulating paper reduces the slot fill factor of the stator assembly, reduces the power density of the drive motor, increases the insulation cost of the drive motor, and increases the temperature rise of the winding. SUMMARY

[0005] The embodiment of the present application provides a stator assembly and an electric machine, which solves the technical problem that the insulating paper reduces the slot fill factor of the stator assembly.

[0006] The first aspect of the embodiment of the present application provides a stator assembly applied to an electric machine, which includes a stator core and a multi-phase winding. The stator core is circumferentially provided with a plurality of stator slots. Each stator slot has M layers of slot layers for the multi-phase winding to be wired, and M is greater than or equal to 4 and is an even number.

[0007] Each phase of the winding includes at least two parallel branches. Each branch includes a first coil group, a same-layer connecting wire, and a second coil group.

[0008] The first coil group enters from the 1st layer of slot layers of the stator slot corresponding to any magnetic pole, gradually winds to the Mth layer of slot layers along a first direction with a span y in the circumference of the stator core, y is the pole pitch of the electric machine, then winds to the Mth layer of slot layers corresponding to the adjacent magnetic pole with a same-layer span y1=y+2 or y1=y-2, then gradually winds to the 1st layer of slot layers along a second direction with a span y in the circumference of the stator core, the second direction is opposite to the first direction, then winds to the 1st layer of slot layers corresponding to the adjacent magnetic pole with a same-layer span y2=2y-y1, and repeats the winding rule until all the 1st layers of slot layers corresponding to the stator slots of all the magnetic poles are traversed.

[0009] The same layer connection line connects the first coil group and the second coil group with a span y3, when the same layer connection line is along the first direction, y3=y-1; when the same layer connection line is along the second direction, y3=y+1;

[0010] The second coil group enters from the first layer slot layer at one end of the same layer connection line away from the first coil group, and is wound in the circumferential direction of the stator core in the first direction with a span y in the adjacent two layer slot layers for one turn; and is wound in the circumferential direction of the stator core in the first direction with a span y in the next group of adjacent two layer slot layers; and the winding rule is repeated until M / 2 groups of adjacent two layer slot layers are wound to the Mth layer slot layer.

[0011] The stator assembly of the embodiment of the present application, each phase winding includes at least two branches, each branch includes a first coil group, a same layer connection line and a second coil group, the first coil group is wound to the Mth layer slot layer in the circumferential direction of the stator core with a span y layer by layer, then wound to the Mth layer slot layer corresponding to the adjacent magnetic pole with a span y1=y+2 or y1=y-2 in the same layer, and then wound to the first layer slot layer in the circumferential direction of the stator core in the second direction opposite to the first direction with a span y layer by layer; and then wound to the first layer slot layer corresponding to the adjacent magnetic pole with a span y2=2y-y1 in the same layer. The second coil group is wound in the circumferential direction of the stator core in the first direction with a span y in the adjacent two layer slot layers for one turn; and is wound in the circumferential direction of the stator core in the first direction with a span y in the next group of adjacent two layer slot layers; and the winding rule is repeated until M / 2 groups of adjacent two layer slot layers are wound to the Mth layer slot layer. The same layer connection line connects the first coil group and the second coil group. Through this winding method, the winding in the same stator slot belongs to the same phase, and the insulation paper in the same stator slot is cancelled, thereby improving the slot fill rate of the motor, improving the power density of the motor, and reducing the insulation cost of the motor. In addition, through this winding method, the magnetic circuit of each branch in each phase winding is completely symmetrical, the circulating current problem caused by the asymmetric structure is eliminated, the efficiency of the motor is improved, and the temperature rise of the motor is reduced. Moreover, since the insulation paper in the same stator slot is cancelled, the plug-in process of the multi-phase winding is simplified, and the manufacturing efficiency of the motor is improved.

[0012] In some embodiments which can comprise the above-mentioned embodiments, the first coil group comprises a plurality of first coil units connected in sequence, each of the first coil units comprises a plurality of first cross-layer conductors, a first same-layer conductor, a plurality of second cross-layer conductors and a second same-layer conductor connected in sequence, the first cross-layer conductors, the first same-layer conductor, the second cross-layer conductors and the second same-layer conductor are U-shaped conductors; the first cross-layer conductors and the second cross-layer conductors are arranged across layers, and the span of the first cross-layer conductors and the second cross-layer conductors is y; the first same-layer conductor is arranged in the same layer, and the span of the first same-layer conductor is y1; the second same-layer conductor is arranged in the same layer, and the span of the second same-layer conductor is y2.

[0013] In some embodiments which can comprise the above-mentioned embodiments, the same-layer connection line comprises a third same-layer conductor, the third same-layer conductor is a U-shaped conductor; the third same-layer conductor is arranged in the same layer, one of the first effective edges of the third same-layer conductor is connected with the first coil group, the other of the first effective edges of the third same-layer conductor is connected with the second coil group, and the span of the third same-layer conductor is y3.

[0014] In some embodiments which can comprise the above-mentioned embodiments, the second coil group comprises a plurality of second coil units connected in sequence, each of the second coil units comprises a plurality of third cross-layer conductors connected in sequence, the third cross-layer conductors are U-shaped conductors, the third cross-layer conductors are arranged across layers, and the span of the third cross-layer conductors is y.

[0015] In some embodiments which can comprise the above-mentioned embodiments, the first coil group further comprises a first lead end, the first lead end is a first S-shaped conductor, and the first S-shaped conductor is located in the first layer slot layer of the stator slot.

[0016] In some embodiments which can comprise the above-mentioned embodiments, the second coil group further comprises a second lead end, the second lead end is a second S-shaped conductor, the second S-shaped conductor is located in the Mth layer slot layer of the stator slot, and is connected with the third cross-layer conductor of the second coil unit.

[0017] In some embodiments which can comprise the above-mentioned embodiments, one of the first lead end and the second lead end is a lead-in line, and the other is a lead-out line.

[0018] In some embodiments which can comprise the above-mentioned embodiments, the number of the stator slots is 54, the number of the magnetic poles is 6, the pole pitch is 9, and the stator slot has 6 slot layers.

[0019] In some embodiments which can comprise the above-mentioned embodiments, the multi-phase winding is a three-phase winding, the three-phase winding is wound on the stator core according to the same winding rule, and the three-phase winding is connected in star or delta connection.

[0020] The second aspect of the embodiments of the present application further provides an electric machine comprising the stator assembly according to any one of the above-mentioned embodiments.

[0021] The electric machine of the embodiments of the present application has the advantages of the stator assembly according to any one of the above-mentioned embodiments, and the embodiments of the present application will not be described here again. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0023] Figure 1 is a structural schematic diagram of the stator assembly of the embodiments of the present application;

[0024] Figure 2 is Figure 1 is a structural schematic diagram of the hairpin end of the stator assembly in the embodiments of the present application;

[0025] Figure 3 is Figure 1 is a structural schematic diagram of the welding end of the stator assembly in the embodiments of the present application;

[0026] Figure 4 is Figure 1 is a structural schematic diagram of the stator slot on the stator core in the embodiments of the present application;

[0027] Figure 5 is Figure 1 is a structural schematic diagram of the multi-phase winding of the stator assembly in the embodiments of the present application, only showing the structure of the A-phase winding;

[0028] Figure 6 is a structural schematic diagram of the U-shaped conductor in some implementation manners of the embodiments of the present application;

[0029] Figure 7 is a structural schematic diagram of the U-shaped conductor in some implementation manners of the embodiments of the present application;

[0030] Figure 8 is a structural schematic diagram of the U-shaped conductor in some implementation manners of the embodiments of the present application;

[0031] Figure 9 is a structural schematic diagram of the first S-shaped conductor of the embodiments of the present application;

[0032] Figure 10 A distribution diagram of phase belts of a multi-phase winding in the first embodiment of the present application;

[0033] Figure 11 A winding rule diagram of a first coil group of the first branch of phase A in the first embodiment of the present application;

[0034] Figure 12 A winding rule diagram of a second coil group of the first branch of phase A in the first embodiment of the present application;

[0035] Figure 13 A winding rule diagram of the winding A1X1 of the first branch of phase A in the first embodiment of the present application;

[0036] Figure 14 A winding rule diagram of the winding A2X2 of the second branch of phase A in the first embodiment of the present application;

[0037] Figure 15 An unfolding diagram of the winding of phase A in the first embodiment of the present application;

[0038] Figure 16 A diagram of star connection of a three-phase winding in the embodiment of the present application;

[0039] Figure 17 A diagram of angular connection of a three-phase winding in the embodiment of the present application;

[0040] Figure 18 A winding rule diagram of the winding A1X1 of the first branch of phase A in the second embodiment of the present application;

[0041] Figure 19 A winding rule diagram of the winding A2X2 of the second branch of phase A in the second embodiment of the present application;

[0042] Figure 20 A winding rule diagram of a first coil group of the first branch of phase A in the third embodiment of the present application;

[0043] Figure 21 A winding rule diagram of a second coil group of the first branch of phase A in the third embodiment of the present application;

[0044] Figure 22 A winding rule diagram of the winding A1X1 of the first branch of phase A in the third embodiment of the present application;

[0045] Figure 23 A winding rule diagram of the winding A2X2 of the second branch of phase A in the third embodiment of the present application;

[0046] Figure 24 An unfolding diagram of the winding of phase A in the third embodiment of the present application;

[0047] Figure 25 Figure 4 is a schematic diagram of a winding rule of a first branch winding A1X1 of phase A in the fourth embodiment of the present application;

[0048] Figure 26 Figure 5 is a schematic diagram of a winding rule of a second branch winding A2X2 of phase A in the fourth embodiment of the present application.

[0049] Legend of reference signs:

[0050] 100 - stator core;

[0051] 110 - stator slot; 120 - hairpin end;

[0052] 130 - soldering end;

[0053] 200 - multi-phase winding;

[0054] 210 - phase A winding; 220 - U-shaped conductor;

[0055] 221 - first effective side; 222 - first hairpin end;

[0056] 223 - first twisted head; 224 - first soldering end;

[0057] 230 - S-shaped conductor; 231 - second effective side;

[0058] 232 - lead end; 233 - second twisted head;

[0059] 234 - second soldering end. DETAILED DESCRIPTION

[0060] The drive motor of an electric vehicle requires light weight, high power density and high efficiency. Compared with a general round copper wire motor, the bare copper slot fill rate of a flat wire motor can reach more than 60%, which is much higher than the bare copper slot fill rate of 40% of a round copper wire. In the case that the slot number of the stator core in the motor is unchanged, increasing the slot fill rate can reduce the direct current resistance of the stator winding in the motor, reduce the copper loss of the motor and improve the efficiency of the motor. Therefore, using a flat wire motor as a drive motor is an important measure to promote the light weight of an electric vehicle, improve the cruising range of an electric vehicle and reduce the cost of a powertrain.

[0061] To realize fast charging of electric vehicles and improve the power density of electric vehicle drive systems, high voltage is required for the drive motor of the electric vehicle. In the related art, the multi-phase winding in the stator assembly is usually a short-pitch winding, so that the multiple layers of conductors in the same stator slot are in different phases. Therefore, an insulating paper needs to be arranged between the conductors in the same stator slot and in different phases, so as to isolate the conductors in different phases by the insulating paper. However, the arrangement of the insulating paper not only reduces the slot fill factor of the motor, but also increases the copper loss and temperature rise of the motor stator winding, limits the power density of the motor, and increases the insulation cost of the motor.

[0062] To solve the technical problem that the insulating paper needs to be arranged between the conductors in the same stator slot and in different phases in the stator core of the stator assembly in the related art, the embodiment of the present application provides a stator assembly, each phase winding of which includes at least two branches, each branch including a first coil group, a same-layer connecting wire and a second coil group, the first coil group being gradually wound to the Mth slot layer in the circumferential direction of the stator core layer by layer with a span y, then wound to the Mth slot layer corresponding to the adjacent magnetic pole layer by layer with a span y1=y+2 or y1=y-2, and then gradually wound to the 1st slot layer in the circumferential direction of the stator core layer by layer with a span y in the second direction opposite to the first direction. Then, the first coil group is wound to the 1st slot layer corresponding to the adjacent magnetic pole layer layer by layer with a span y2=2y-y1. The second coil group is alternately wound in the circumferential direction of the stator core layer in the adjacent two slot layers with a span y in the first direction for one turn, and then wound in the circumferential direction of the stator core layer in the next group of adjacent two slot layers with a span y in the first direction for one turn. The winding rule is followed until M / 2 groups of adjacent two slot layers are wound to the Mth slot layer. The same-layer connecting wire connects the first coil group and the second coil group. By this winding method, the winding in the same stator slot belongs to the same phase, and the insulating paper in the same stator slot is cancelled, thereby improving the slot fill factor of the motor, improving the power density of the motor, and reducing the insulation cost of the motor. In addition, by this winding method, the magnetic circuit of each branch in each phase winding is completely symmetrical, the circulating current problem caused by the asymmetric structure is eliminated, the efficiency of the motor is improved, and the temperature rise of the motor is reduced.

[0063] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0064] First, the related technical terms in the motor involved in the embodiments of the present application are explained and described.

[0065] The number of poles of the motor, i.e. the number of magnetic poles of the motor, the magnetic poles are divided into N poles and S poles, one N pole and one S pole are generally referred to as a pair of magnetic poles, that is, the pole pair number (P) of the motor is 1.

[0066] The number of slots per pole per phase, the number of slots occupied by each phase winding under each magnetic pole is referred to as the number of slots per pole per phase.

[0067] The number of phases of the motor, the phase in the number of phases of the motor generally refers to the use of several phase lines (i.e. live lines), for example, a three-phase motor uses three phase lines. The number of outgoing lines on the motor stator side (excluding neutral lines) is usually used to define the number of phases of the motor.

[0068] The phase belt of the motor, i.e. the number of slots on the stator core occupied by each pole per phase winding in succession.

[0069] The slot fill rate, the ratio of the conductor cross-sectional area in the slot of the stator core to the effective area of the slot body.

[0070] The pole pitch of the motor, i.e. the distance between adjacent two magnetic poles along the surface of the stator core.

[0071] The span, also known as the pitch, refers to the distance across by two effective edges of the same conductor in the winding in the motor on the surface of the stator core, which is usually expressed by the number of slots.

[0072] Integral pitch, i.e. the pitch is equal to the pole pitch.

[0073] Short pitch: the pitch is less than the pole pitch.

[0074] The first aspect of the embodiment of the application provides a stator assembly applied to a motor. Referring to Figure 1 and Figure 4 The stator assembly can include a stator core 100 and a multi-phase winding 200. The circumferential direction of the stator core 100 is provided with a plurality of stator slots 110. Exemplarily, the stator slots 110 can be arranged along the circumferential direction of the inner wall of the stator core 100, and the stator slots 110 can be spaced apart at a predetermined pitch on the stator core 100. Each stator slot 110 has M layers of slot layers for wiring of the multi-phase winding. M can be greater than or equal to 4, and M is an even number. For example Figure 4As shown in the figure, the stator slot 110 can have 6 layers of slot layers in the direction from the slot bottom to the slot opening, which can be a, b, c, d, e, f layers in turn. Exemplarily, the a layer slot layer, i.e., the first layer slot layer, is at the innermost side of the stator slot 110, and the f layer slot layer, i.e., the sixth layer slot layer, is at the outermost side of the stator slot 110. It can be understood that the a layer slot layer can also be at the outermost side of the stator slot 110, and the f layer slot layer can also be at the innermost side of the stator slot 110. It should be noted that the slot layer can be understood as a space for winding the winding in the direction of the slot depth of the stator slot 110, which can be a virtual space in the stator slot 110, so as to describe the position of the winding in the direction of the slot depth of the stator slot 110 when the winding is arranged in the stator slot 110.

[0075] Reference Figure 2 and Figure 3 The two end faces of the stator core 100 can be defined as the hairpin end 120 and the welding end 130 respectively, and the multi-phase winding 200 can be inserted into the inside of the stator core 100 from the hairpin end 120 side and can be welded at the welding end 130. Exemplarily, the hairpin end 120 can be located at the top end of the stator core 100, and the welding end 130 can be located at the bottom end of the stator core 100.

[0076] The multi-phase winding 200 is a plurality of phase windings, and the plurality of phase windings are different from each other in electrical phase. Exemplarily, the multi-phase winding 200 can be a three-phase winding, and the three-phase winding can have the same winding rule on the stator core 100 and differ by 120° in spatial phase. That is, the multi-phase winding 200 can include three phase windings, such as an A-phase winding, a B-phase winding and a C-phase winding. The three-phase winding can be connected in star or delta. Figure 5 For the stator assembly of the embodiment of the present application, only the structure schematic diagram when the stator core 100 and the A-phase winding 210 are shown.

[0077] Exemplarily, each phase winding can include at least two parallel branches. For example, the number a of branches in each phase winding can be less than or equal to M / 2. For example, a can be 2, 3 or other values satisfying the condition formula.

[0078] Each branch may include a first coil group, a connecting wire on the same layer, and a second coil group. The first coil group enters from the first slot layer of the stator slot 110 corresponding to any magnetic pole, and is gradually wound across layers along the first direction on the circumference of the stator core 100 with a span y, where y is the pole pitch of the motor; then it is wound in the same layer with a span y1 = y + 2 or y1 = y - 2 to the Mth slot layer corresponding to the adjacent magnetic pole; then it is gradually wound across layers along the second direction on the circumference of the stator core 100 with a span y, where the second direction is opposite to the first direction; then it is wound in the same layer with a span y2 = 2y - y1 to the first slot layer corresponding to the adjacent magnetic pole; the above winding pattern is repeated until the first slot layer of the stator slot 110 corresponding to all magnetic poles is traversed. The connecting wire in the same layer connects the first coil group and the second coil group with a span of y3. When the connecting wire is along the first direction, y3 = y-1; when the connecting wire is along the second direction, y3 = y+1. The second coil group enters from the first slot layer at the end of the connecting wire away from the first coil group, and is wound alternately in two adjacent slot layers along the first direction with a span of y. Then it is moved to the next group of adjacent slot layers and wound again in the first direction with a span of y. This winding pattern continues until the M / 2 groups of adjacent slot layers are wound to the Mth slot layer.

[0079] For example, the first direction can be a clockwise direction when viewed from the hairpin end 120 of the stator core 100, and the second direction can be a counterclockwise direction when viewed from the hairpin end 120 of the stator core 100. It is understood that the first direction and the second direction can also be interchanged.

[0080] It should be noted that when winding the second coil group, the slot layers of the stator core 100 are divided into M / 2 groups of adjacent slot layers. For example, the first slot layer and the second slot layer can be the first group of adjacent slot layers, the third slot layer and the fourth slot layer can be the second group of adjacent slot layers, and so on. The M-1 slot layer and the M slot layer can be the M / 2 group of adjacent slot layers.

[0081] This winding method ensures that all windings within the same stator slot 110 belong to the same phase, eliminating the need for insulating paper within the same slot. This improves the slot fill factor, increases the power density, and reduces insulation costs. Furthermore, this winding method ensures complete symmetry in the magnetic circuits of each branch in each phase winding, eliminating circulating current problems caused by asymmetrical structures, improving motor efficiency, and reducing temperature rise. Moreover, eliminating insulating paper within the same stator slot 110 simplifies the wiring process for multi-phase windings, improving motor manufacturing efficiency.

[0082] The first coil group, the second coil group, and the in-layer connecting wires may all include a U-shaped conductor 220. For example, refer to...Figure 6 The U-shaped conductor 220 can include a first effective side 221, a first hairpin end 222, and a first twisted head 223. The first effective side 221 is two, and the two first effective sides 221 are oppositely arranged and arranged in the same layer or different layers of slots in different stator slots 110. The first hairpin end 222 connects the first ends of the two first effective sides 221, and the first hairpin end 222 can be located at the hairpin end 120 of the stator core 100. The second end of each first effective side 221 is provided with a first twisted head 223. Referring to Figure 6 In some implementations of the embodiments of the present application, the twisting directions of the two first twisted heads 223 can be opposite and away from each other. Referring to Figure 7 In some implementations of the embodiments of the present application, the twisting directions of the two first twisted heads 223 can be the same, and can be deflected to the left at the same time. Referring to Figure 8 In some implementations of the embodiments of the present application, the twisting directions of the two first twisted heads 223 can be the same, and can be deflected to the right at the same time. The end of the first twisted head 223 is a first welding end 224. The first welding ends 224 of different U-shaped conductors 220 can be welded to form a coil. Different structures of U-shaped conductors 220 can be selected according to the specific structure of the first coil group, the second coil group, and the same layer connecting wire.

[0083] Exemplarily, the first coil group can include a plurality of first coil units connected in sequence, and each first coil unit includes a plurality of first interlayer conductors, a first same layer conductor, a plurality of second interlayer conductors, and a second same layer conductor connected in sequence. The first interlayer conductor, the first same layer conductor, the second interlayer conductor, and the second same layer conductor can all be U-shaped conductors 220. The first interlayer conductor and the second interlayer conductor are arranged across layers, that is, the two first effective sides 221 of the first interlayer conductor and the two first effective sides 221 of the second interlayer conductor are respectively inserted into the slot layers of different layers. And the span of the first interlayer conductor and the second interlayer conductor is y. The first same layer conductor is arranged in the same layer, that is, the two first effective sides 221 of the first same layer conductor are respectively inserted into the slot layers of the same layer. The span of the first same layer conductor is y1. The second same layer conductor is arranged in the same layer, that is, the two first effective sides 221 of the second same layer conductor are respectively inserted into the slot layers of the same layer. The span of the second same layer conductor is y2.

[0084] The first coil group can further include a first lead end. The first lead end can be a first S-shaped conductor. Exemplarily, referring to Figure 9The first S-shaped conductor 230 can include a second effective side 231, a lead end 232, and a second twisted head 233. The second effective side 231 can be located in a slot layer in the stator slot 110. The lead end 232 is connected to a first end of the second effective side 231, and the lead end 232 can be located at the hairpin end 120 of the stator core 100, for example. The second twisted head 233 is connected to a second end of the second effective side 231, and the second twisted head 233 can be located at the welding end 130 of the stator core 100, for example. An end of the second twisted head 233 can have a second welding end 234. The second welding end 234 can be welded with the first welding end 224 of the U-shaped conductor 220 to form a coil. The second effective side 231 of the first S-shaped conductor can be located in the first layer of the slot layer of the stator slot 110, for example. The second effective side 231 of the first S-shaped conductor can be connected with the first cross-layer conductor in the first coil unit, for example.

[0085] The same-layer connection line can include a third same-layer conductor, which can be a U-shaped conductor 220, for example. The third same-layer conductor is arranged in the same layer, that is, two first effective sides 221 of the third same-layer conductor are respectively inserted into slot layers in the same layer. One first effective side 221 of the third same-layer conductor is connected with the first coil group, and the other first effective side of the third same-layer conductor is connected with the second coil group, and the span of the third same-layer conductor is y3.

[0086] The second coil group can include a plurality of second coil units connected in sequence, and each second coil unit can include a plurality of third cross-layer conductors connected in sequence, which can be U-shaped conductors 220, for example. The third cross-layer conductors are arranged in different layers, that is, two first effective sides 221 of the third cross-layer conductors are respectively inserted into slot layers in different layers. The span of the third cross-layer conductor is y.

[0087] The second coil group can further include a second lead end, which can be a second S-shaped conductor located in the Mth layer of the slot layer of the stator slot 110. The second S-shaped conductor can be connected with the third cross-layer conductor of the second coil unit, for example. The structure of the second S-shaped conductor can refer to the description of the first S-shaped conductor above, and details are not described herein. One of the first lead end and the second lead end can be a lead-in wire, and the other can be a lead-out wire.

[0088] The second aspect of the embodiment of the present application further provides an electric machine including the above-mentioned stator assembly. The electric machine of the embodiment of the present application also has the advantages of any one of the above-mentioned stator assemblies, and details are not described herein.

[0089] To facilitate understanding of the technical solutions of the embodiments of the present application, the technical solutions of the embodiments of the present application will be described below by taking a multi-phase winding 200 including 2 branches as an example, where the number of phases m is 3, the number of poles 2P is 6, the number of slots Q of the stator slot 110 is 54, the number of slot layers M of each stator slot 110 is 6, the number of slots q per pole per phase is 3, the pole pitch τ is 9, and each phase winding includes 2 branches.

[0090] First embodiment

[0091] First, the phase belt of the multi-phase winding is divided. A schematic diagram of phase belt division is shown in Figure 10

[0092] Reference Figure 11 , Figure 13 and Figure 15 , the first coil group of the first branch A1X1 of phase A can enter from the slot layer a of the first stator slot 110 corresponding to the first magnetic pole, gradually wind in the circumferential direction of the stator core 100 with a span y=9 from layer to layer to the slot layer f of the 46th stator slot 110, y is the pole pitch of the motor; then wind in the same layer with a span y1=11 to the slot layer f of the third stator slot 110 corresponding to the adjacent magnetic pole; then gradually wind in the circumferential direction of the stator core 100 with a span y=9 from layer to layer to the slot layer a of the 12th stator slot 110, the second direction is opposite to the first direction; then wind in the same layer with a span y2=7 to the slot layer a of the 19th stator slot 110 corresponding to the adjacent magnetic pole. Repeat the above winding rule until all the slot layers a of the stator slots 110 corresponding to the magnetic poles are traversed.

[0093] Reference Figure 11 , the winding mode of the first coil group of the first branch A1X1 is as follows: 1a→10b→19c→28d→37e→46f→3f→48e→39d→30c→21b→12a→19a→28b→37c→46d→1e→10f→21f→12e→3d→48c→39b→30a→37a→46b→1c→10d→19e→28f→39f→30e→21d→12c→3b→48a.

[0094] Reference Figure 11 and Figure 13 , the same layer connection line of the first branch A1X1 is in the first direction, and the same layer connection line of the first branch A1X1 connects the first coil group and the second coil group with a span y3=8.

[0095] The winding mode of the same layer connection line of the first branch A1X1 is as follows: 48a→2a.

[0096] Reference Figure 12 , Figure 13 and Figure 15 ​The second coil group of the first branch A1X1 enters at the end of the same layer connection line away from the first coil group, i.e., at the slot layer a of the 2nd stator slot 110, and is wound in the first direction across layers by 3 turns to the slot layer f of the 47th stator slot 110 with a span y = 9.

[0097] The winding mode of the second coil of the first branch A1X1 is as follows: 2a→11b→20a→29b→38a→47b→2c→11d→20c→29d→38c→47d→2e→11f→20e→29f→38e→47f.

[0098] It should be noted that, Figure 11 , Figure 12 and Figure 13 The arrow direction in

[0099] As shown in Figure 13 , the first coil group, the same layer connection line, and the second coil group form the first branch A1X1 of phase A.

[0100] Referring to Figure 14 , the winding mode of the second branch A2X2 of phase A is similar to that of the first branch A1X1. The difference is that the first coil group of the second branch A2X2 of phase A enters at the slot layer a of the 10th stator slot 110, and the second coil group of the second branch A2X2 of phase A enters at the slot layer a of the 11th stator slot 110.

[0101] Referring to Figure 14 , the winding mode of the first coil group of the second branch A2X2 is as follows: 3a←12b←21c←30d←39e←48f←37f←28e←19d←10c←1b←46a←39a←48b←3c←12d←21e←30f←19f←10e←1d←46c←37b←28a←21a←30b←39c←48d←3e←12f←1f←46e←37d←28c←19b←10a.

[0102] The winding mode of the same layer connection line of the second branch A2X2 is as follows: 11a←3a.

[0103] The winding manner of the second coil set of the second branch A2X2 is as follows: 2f←47e←38f←29e←20f←11e←2d←47c←38d←29c←20d←11c←2b←47a←38b←29a←20b←11a.

[0104] It should be noted that, Figure 14 The arrow direction in the second branch A2X2 is used to illustrate the current direction in the first coil set, the same layer connection line and the second coil set in the second branch A2X2, which is independent of the winding manner of the first coil set, the same layer connection line and the second coil set in the second branch A2X2. For example, the winding manner of the first coil set, the same layer connection line and the second coil set in the second branch A2X2 can be opposite to the current direction in the first coil set, the same layer connection line and the second coil set in the second branch A2X2.

[0105] Referring to Figure 15 , only the development diagram of the A-phase winding is drawn in the winding development diagram, and the windings of the B-phase and the C-phase are not involved. The B-phase winding and the C-phase winding have the same winding manner as the A-phase winding, and are 120° apart in space phase, specifically, the B-phase is translated by 2q stator slots 110 relative to the A-phase, and the C-phase is translated by 2q stator slots 110 relative to the B-phase.

[0106] Referring to Figure 16 , the A-phase winding, the B-phase winding and the C-phase winding can be connected in star. Figure 17 , the A-phase winding, the B-phase winding and the C-phase winding can also be connected in delta.

[0107] Through such a winding manner, each branch can traverse the arranged phase belt and slot layer position, so that the potential of each branch is balanced, there is no circulating current between the branches, the efficiency of the motor is improved, and the temperature rise of the motor is reduced. In addition, the conductors in the same stator slot 110 belong to the same phase, so there is no need to set an insulating paper between the conductors, thereby improving the slot fill factor, improving the power density of the motor, and reducing the insulation cost of the motor.

[0108] Second embodiment

[0109] Referring to Figure 18, the first coil group of the first branch A1X1 of phase A can enter from the slot layer a of the 1st stator slot 110 corresponding to the 1st magnetic pole, gradually wind in the circumferential direction of the stator core 100 layer by layer in the first direction to the slot layer f of the 46th stator slot 110 with a span y=9, y is the pole pitch of the motor, then wind in the same layer to the slot layer f of the 39th stator slot 110 corresponding to the adjacent magnetic pole with a span y1=7, then gradually wind in the circumferential direction of the stator core layer by layer in the second direction to the slot layer a of the 48th stator slot 110 with a span y=9, the second direction is opposite to the first direction, and then wind in the same layer to the slot layer a of the 37th stator slot 110 corresponding to the adjacent magnetic pole with a span y2=11. Repeat the above winding rule until all the slot layers a of the stator slots 110 corresponding to the magnetic poles are traversed.

[0110] With reference to Figure 18 , the winding mode of the first coil group of the first branch A1X1 is as follows: 1a→10b→19c→28d→37e→46f→39f→30e→21d→12c→3b→48a→37a→46b→1c→10d→19e→28f→21f→12e→3d→48c→39b→30a→19a→28b→37c→46d→1e→10f→3f→48e→39d→30c→21b→12a.

[0111] With reference to Figure 18 , the same-layer connection line of the first branch A1X1 is in the second direction, and the second direction is opposite to the first direction. The same-layer connection line of the first branch A1X1 connects the first coil group and the second coil group with a span y3=10.

[0112] The winding mode of the same-layer connection line of the first branch A1X1 is as follows: 12a→2a.

[0113] With reference to Figure 18 , the second coil group of the first branch A1X1 enters the slot layer a of the 2nd stator slot 110 away from the first coil group at one end of the same-layer connection line, and is wound layer by layer in the first direction for 3 turns to the slot layer f of the 47th stator slot 110 with a span y=9.

[0114] The winding mode of the second coil of the first branch A1X1 is as follows: 2a→11b→20a→29b→38a→47b→2c→11d→20c→29d→38c→47d→2e→11f→20e→29f→38e→47f.

[0115] It should be noted that, Figure 18The arrows in the diagram illustrate the direction of current within the first coil group, the in-layer connecting line, and the second coil group of the first branch A1X1, and are independent of the winding method of these components. For example, the winding method of the first coil group, the in-layer connecting line, and the second coil group of the first branch A1X1 can be the same as the direction of current within these components.

[0116] refer to Figure 19 The winding method of the second branch A2X2 of phase A is similar to that of the first branch A1X1. The difference is that the first coil group of the second branch A2X2 of phase A enters from slot layer a of the 10th stator slot 110, while the second coil group of the second branch A2X2 of phase A enters from slot layer a of the 11th stator slot 110.

[0117] refer to Figure 19 The winding method of the first coil group of the second branch A2X2 is as follows: 21a←30b←39c←48d←3e←12f←19f←10e←1d←46c←37b←28a←39a←48b←3c←12d←21e←30f←37f←28e←19d←10c←1b←46a←3a←12b←21c←30d←39e←48f←1f←46e←37d←28c←19b←10a.

[0118] The winding method of the same-layer connecting line of the second branch A2X2 is as follows: 11a←21a.

[0119] The winding method of the second coil group of the second branch A2X2 is as follows: 2f←47e←38f←29e←20f←11e←2d←47c←38d←29c←20d←11c←2b←47a←38b←29a←20b←11a.

[0120] It should be noted that, Figure 19 The arrows in the diagram illustrate the direction of current in the first coil group, the in-layer connecting line, and the second coil group in the second branch A2X2, and are independent of the winding method of these coil groups. For example, the winding method of the first coil group, the in-layer connecting line, and the second coil group in the second branch A2X2 can be opposite to the direction of current in these coil groups.

[0121] The remainder of the second embodiment can be referred to the description of the first embodiment, and will not be repeated here.

[0122] Through the winding mode, each branch can traverse the arranged phase belt and slot layer position, so that the potential of each branch is balanced, there is no circulating current between the branches, the efficiency of the motor is improved, and the temperature rise of the motor is reduced. The conductors in the stator slot 110 belong to the same phase, so there is no need to set an insulating paper between the conductors, thereby improving the slot fill rate, improving the power density of the motor, and reducing the insulation cost of the motor.

[0123] Third embodiment

[0124] Reference Figure 20 、 Figure 22 and Figure 24 The first coil group of the first branch A1X1 of phase A can enter the slot layer a of the 3rd stator slot 110 corresponding to the 1st magnetic pole, gradually wind in the circumferential direction of the stator core 100 with a span y=9 to the slot layer f of the 48th stator slot 110 in the first direction, y is the pole pitch of the motor; then wind in the same layer with a span y1=7 to the slot layer f of the 1st stator slot 110 corresponding to the adjacent magnetic pole; then gradually wind in the circumferential direction of the stator core with a span y=9 to the slot layer a of the 10th stator slot 110 in the second direction, the second direction is opposite to the first direction; then wind in the same layer with a span y2=11 to the slot layer a of the 21st stator slot 110 corresponding to the adjacent magnetic pole. Repeat the above winding rule until all the slot layers a of the 47th stator slot 110 corresponding to the magnetic poles are traversed.

[0125] Reference Figure 20 The winding mode of the first coil group of the first branch A1X1 is as follows: 3a→12b→21c→30d→39e→48f→1f→46e→37d→28c→19b→10a→21a→30b→39c→48d→3e→12f→19f→10e→1d→46c→37b→28a→39a→48b→3c→12d→21e→30f→37f→28e→19d→10c→1b→46a.

[0126] Reference Figure 20 and Figure 22 The same layer connection line of the first branch A1X1 is in the first direction, and the same layer connection line of the first branch A1X1 connects the first coil group and the second coil group with a span y3=10.

[0127] The winding mode of the same layer connection line of the first branch A1X1 is as follows: 46a→2a.

[0128] Reference Figure 21 、 Figure 22 and Figure 24, the second coil group of the first branch A1X1 enters at the end of the same layer connection line away from the first coil group, i.e. at the slot layer a of the 2nd stator slot 110, and is wound in the first direction across layers by 3 turns to the slot layer f of the 47th stator slot 110 with a span y = 9.

[0129] The winding mode of the second coil of the first branch A1X1 is as follows: 2a→11b→20a→29b→38a→47b→2c→11d→20c→29d→38c→47d→2e→11f→20e→29f→38e→47f.

[0130] It should be noted that, Figure 20 , Figure 21 and Figure 22 The arrow direction in

[0131] As shown in Figure 22 , the first coil group, the same layer connection line and the second coil group form the first branch A1X1 of phase A.

[0132] Referring to Figure 23 , the winding mode of the second branch A2X2 of phase A is similar to that of the first branch A1X1. The difference is that the first coil group of the second branch A2X2 of phase A enters at the slot layer a of the 12th stator slot 110, and the second coil group of the second branch A2X2 of phase A enters at the slot layer a of the 11th stator slot 110.

[0133] Referring to Figure 23 , the winding mode of the first coil group of the second branch A2X2 is as follows: 1a←10b←19c←28d←37e←46f←39f←30e←21d←12c←3b←48a←37a←46b←1c←10d←19e←28f←21f←12e←3d←48c←39b←30a←19a←28b←37c←46d←1e←10f←3f←48e←39d←30c←21b←12a.

[0134] The winding mode of the same layer connection line of the second branch A2X2 is as follows: 11a←1a.

[0135] The winding manner of the second coil group of the second branch A2X2 is as follows: 2f←47e←38f←29e←20f←11e←2d←47c←38d←29c←20d←11c←2b←47a←38b←29a←20b←11a.

[0136] It should be noted that, Figure 23 The arrow direction in the second branch A2X2 is used to illustrate the current direction in the first coil group, the same layer connection line and the second coil group in the second branch A2X2, which is independent of the winding manner of the first coil group, the same layer connection line and the second coil group in the second branch A2X2. For example, the winding manner of the first coil group, the same layer connection line and the second coil group in the second branch A2X2 can be opposite to the current direction in the first coil group, the same layer connection line and the second coil group in the second branch A2X2.

[0137] Reference Figure 24 In the winding development diagram, only the development diagram of the A-phase winding is drawn, and the windings of the B-phase and the C-phase are not involved. The B-phase winding and the C-phase winding have the same winding manner as the A-phase winding, and are phase-shifted by 120° in space, specifically, the B-phase is shifted by 2q stator slots 110 with respect to the A-phase, and the C-phase is shifted by 2q stator slots 110 with respect to the B-phase.

[0138] The remaining part of the third embodiment can refer to the first embodiment, which will not be described here.

[0139] Fourth embodiment

[0140] Reference Figure 25 The first coil group of the A-phase first branch A1X1 can enter from the slot layer a of the 3rd stator slot 110 corresponding to the 1st magnetic pole, gradually wind in the circumferential direction of the stator core 100 with a span y=9 layer by layer in the first direction to the slot layer f of the 48th stator slot 110, y is the pole pitch of the motor; then wind in the same layer with a span y1=11 to the slot layer f of the 37th stator slot 110 corresponding to the adjacent magnetic pole; then gradually wind in the circumferential direction of the stator core 100 with a span y=9 layer by layer in the second direction to the slot layer a of the 46th stator slot 110, the second direction is opposite to the first direction; then wind in the same layer with a span y2=7 to the slot layer a of the 39th stator slot 110 corresponding to the adjacent magnetic pole. Repeat the above winding rule until all the stator slots 110 corresponding to the magnetic poles are traversed.

[0141] The winding manner of the first coil group of the first branch A1X1 is as follows: 3a→12b→21c→30d→39e→48f→37f→28e→19d→10c→1b→46a→39a→48b→3c→12d→21e→30f→19f→10e→1d→46c→37b→28a→21a→30b→39c→48d→3e→12f→1f→46e→37d→28c→19b→10a.

[0142] Referring to Figure 25 , the same-layer connection line of the first branch A1X1 is along the second direction, and the second direction is opposite to the first direction. The same-layer connection line of the first branch A1X1 connects the first coil group and the second coil group with a span y3=8.

[0143] The winding manner of the same-layer connection line of the first branch A1X1 is as follows: 10a→2a.

[0144] Referring to Figure 25 , the second coil group of the first branch A1X1 enters at the end of the same-layer connection line away from the first coil group, that is, at the slot layer a of the 2nd stator slot 110, and is wound in the first direction with a span y=9 for 3 turns to the slot layer f of the 47th stator slot 110.

[0145] The winding manner of the second coil of the first branch A1X1 is as follows: 2a→11b→20a→29b→38a→47b→2c→11d→20c→29d→38c→47d→2e→11f→20e→29f→38e→47f.

[0146] It should be noted that Figure 25 the arrow direction in the above table is used to illustrate the current direction in the first coil group, the same-layer connection line and the second coil group of the first branch A1X1, and is irrelevant to the winding manner of the first coil group, the same-layer connection line and the second coil group of the first branch A1X1. For example, the winding manner of the first coil group, the same-layer connection line and the second coil group of the first branch A1X1 can be the same as the current direction in the first coil group, the same-layer connection line and the second coil group of the first branch A1X1.

[0147] Referring to Figure 26 , the winding manner of the A-phase second branch A2X2 is similar to that of the first branch A1X1. The difference is that the first coil group of the A-phase second branch A2X2 enters at the slot layer a of the 12th stator slot 110, and the second coil group of the A-phase second branch A2X2 enters at the slot layer a of the 11th stator slot 110.

[0148] Referring to Figure 26The winding mode of the first coil group of the second branch A2X2 is as follows: 19a←28b←37c←46d←1e←10f←21f←12e←3d←48c←39b←30a←37a←46b←1c←10d←19e←28f←39f←30e←21d←12c←3b←48a←1a←10b←19c←28d←37e←46f←3f←48e←39d←30c←21b←12a.

[0149] The winding mode of the same layer connection line of the second branch A2X2 is as follows: 11a←19a.

[0150] The winding mode of the second coil group of the second branch A2X2 is as follows: 2f←47e←38f←29e←20f←11e←2d←47c←38d←29c←20d←11c←2b←47a←38b←29a←20b←11a.

[0151] It should be noted that, Figure 26 The arrow direction in the above table is used to illustrate the current direction in the first coil group, the same layer connection line and the second coil group of the second branch A2X2, and is irrelevant to the winding mode of the first coil group, the same layer connection line and the second coil group of the second branch A2X2. For example, the winding mode of the first coil group, the same layer connection line and the second coil group of the second branch A2X2 can be opposite to the current direction in the first coil group, the same layer connection line and the second coil group of the second branch A2X2.

[0152] The remaining parts of the fourth embodiment can refer to the description of the first embodiment, which will not be repeated here.

[0153] Through the winding mode, each branch can traverse the arranged phase belt and slot layer position, so that the potential of each branch is balanced, there is no circulating current between the branches, the efficiency of the motor is improved, and the temperature rise of the motor is reduced. The conductors in the same slot 110 belong to the same phase, so there is no need to set an insulating paper between the conductors, thereby improving the slot fill factor, improving the power density of the motor, and reducing the insulation cost of the motor.

[0154] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A stator assembly used in a motor, characterized in that, The stator assembly comprises a stator core and a multi-phase winding, the stator core is circumferentially provided with a plurality of stator slots, each of the stator slots has M layers of slot layers for the multi-phase winding to be wired, M is greater than or equal to 4, and M is an even number; Each of the windings comprises at least two parallel branches, each of the branches comprises a first coil group, a same-layer connecting wire and a second coil group; The first coil group enters from the first layer of slot layers of the stator slot corresponding to any magnetic pole, is gradually wound to the Mth layer of slot layers in the circumferential direction of the stator core with a span y in a first direction, y is the pole pitch of the motor, then is wound to the Mth layer of slot layers corresponding to the adjacent magnetic pole in the same layer with a span y1=y+2 or y1=y-2, is gradually wound to the first layer of slot layers in the circumferential direction of the stator core with a span y in a second direction, the second direction is opposite to the first direction, then is wound to the first layer of slot layers corresponding to the adjacent magnetic pole in the same layer with a span y2=2y-y1, and the winding rule is repeated until all the first layers of slot layers of the stator slots corresponding to all the magnetic poles are traversed. The same-layer connecting wire connects the first coil group and the second coil group with a span y3, when the same-layer connecting wire is in the first direction, y3=y-1, and when the same-layer connecting wire is in the second direction, y3=y+1. The second coil group enters from the first layer of slot layers at one end of the same-layer connecting wire away from the first coil group, is alternately wound in the circumferential direction of the stator core in two adjacent layers of slot layers with a span y in the first direction for one turn, then is wound in the circumferential direction of the stator core in the next two adjacent layers of slot layers with a span y in the first direction for one turn, and the winding rule is repeated until M / 2 groups of two adjacent layers of slot layers are wound to the Mth layer of slot layers.

2. The stator assembly of claim 1, wherein, The first coil group comprises a plurality of first coil units connected in sequence, each first coil unit comprises a plurality of first cross-layer conductors, a first same-layer conductor, a plurality of second cross-layer conductors and a second same-layer conductor connected in sequence, the first cross-layer conductor, the first same-layer conductor, the second cross-layer conductor and the second same-layer conductor are U-shaped conductors, the first cross-layer conductor and the second cross-layer conductor are cross-layer arranged, the span of the first cross-layer conductor and the second cross-layer conductor is y, the first same-layer conductor is same-layer arranged, the span of the first same-layer conductor is y1, and the second same-layer conductor is same-layer arranged, the span of the second same-layer conductor is y2.

3. The stator assembly of claim 1, wherein, The same-layer connecting wire comprises a third same-layer conductor, the third same-layer conductor is a U-shaped conductor, the third same-layer conductor is same-layer arranged, one first effective edge of the third same-layer conductor is connected with the first coil group, the other first effective edge of the third same-layer conductor is connected with the second coil group, and the span of the third same-layer conductor is y3.

4. The stator assembly of claim 1, wherein, The second coil group comprises a plurality of second coil units connected in sequence, each second coil unit comprises a plurality of third cross-layer conductors connected in sequence, the third cross-layer conductor is a U-shaped conductor, the third cross-layer conductor is cross-layer arranged, and the span of the third cross-layer conductor is y.

5. The stator assembly of claim 1, wherein, The first coil group further comprises a first lead end, which is a first S-shaped conductor located in a first layer of the stator slots.

6. The stator assembly of claim 5, wherein, The second coil group further comprises a second lead end, which is a second S-shaped conductor located in an Mth layer of the stator slots.

7. The stator assembly of claim 6, wherein, One of the first lead end and the second lead end is a lead-in wire, and the other is a lead-out wire.

8. A stator assembly according to any one of claims 1 to 7, wherein, The number of the stator slots is 54, the number of the magnetic poles is 6, and the pole pitch is 9.

9. A stator assembly according to any one of claims 1 to 7, wherein, The multi-phase winding is a three-phase winding, the three-phase winding has the same winding rule on the stator core and a phase difference of 120° in space, and the three-phase winding is connected in star or in delta.

10. An electric machine characterized by The stator assembly comprises the stator assembly according to any one of claims 1-9.

Images