CN212381009U

CN212381009U - Flat wire stator assembly and driving motor

Info

Publication number: CN212381009U
Application number: CN202021221503.9U
Authority: CN
Inventors: 于吉坤; 陈文欣; 张�杰; 章正昌
Original assignee: Suzhou Huichuan United Power System Co Ltd
Current assignee: Suzhou Huichuan United Power System Co Ltd
Priority date: 2020-06-28
Filing date: 2020-06-28
Publication date: 2021-01-19
Anticipated expiration: 2030-06-28

Abstract

The utility model provides a flat wire stator component and a driving motor, wherein the flat wire stator component is applied to an M-phase motor with a rotor pole number of 2 p; the flat wire stator assembly comprises a stator core and M-phase stator windings, the stator core is provided with stator slots, and the M-phase stator windings are wound into six layers in the stator slots; each phase of the M-phase stator windings comprises a set of sub-windings, wherein a is not a divisor of 2 p; each set of sub-winding comprises coils distributed on the first layer and the second layer, the third layer and the fourth layer, and the fifth layer and the sixth layer of the stator slot respectively, and the number of the coils distributed on the first layer and the second layer, the number of the coils distributed on the third layer and the fourth layer, and the number of the coils distributed on the fifth layer and the sixth layer of each set of sub-winding are all larger than or equal to 2. The embodiment of the utility model provides an optimized connected mode, the asymmetry that makes the inductance between each set of winding is less to reduce the winding circulation, consume with reducing additional copper.

Description

Flat wire stator assembly and driving motor

Technical Field

The embodiment of the utility model provides a relate to the motor field, more specifically say, relate to a flat wire stator subassembly and driving motor.

Background

Environmental pollution and energy crisis promote the vigorous development of the new energy automobile industry, especially the electric automobile industry. The performance of a vehicle driving motor, which is one of the key executing components of an electric vehicle, is critical to the performance of the whole vehicle. At present, the motor for the vehicle is developed towards the direction of high speed, light weight and high efficiency, and has higher requirements on the power density, the efficiency level and the heat dissipation capacity of the motor.

Compared with a round wire motor, the flat wire motor has the advantages of higher motor slot filling rate, shorter winding end part, higher power density and stronger heat dissipation capability, thereby being particularly suitable for the application requirements of miniaturization and light weight of the vehicle driving motor.

The flat wire motor has an inherent skin effect phenomenon, particularly a high-speed motor, the skin effect is serious, so that the number of conductor layers in a stator slot is increased for weakening the skin effect, and the thickness of the flat wire is reduced. Along with the increase of the number of layers of the flat wires and the increase of the winding connection mode, the unreasonable connection mode can bring unbalance of winding inductance, further winding circulation is generated, and the additional copper consumption of the winding is increased.

As shown in fig. 1 and 2, the schematic diagrams are a topological structure diagram of three-phase stator windings (for example, a U-phase stator winding, a V-phase stator winding, and a W-phase stator winding) in a conventional flat-wire motor, and a winding structure diagram of three sets of sub-windings (including a first set of sub-windings U1, a second set of sub-windings U2, and a third set of sub-windings U3) in each phase of stator winding on a stator core. Because of the limitation of the connection mode, the third set of sub-windings U3 in each phase of stator winding of the conventional flat wire motor is not provided with coils connected in series to the third layer and the fourth layer of the stator slot, so that the inductance between the three sets of sub-windings has large asymmetry, as shown in fig. 3, large winding circulation is generated, and additional copper loss is increased.

In addition, the third set of sub-winding U3 distributes in the first layer of stator slot and the coil on second floor, with distribute in the coil on fifth layer and sixth floor need stride the layer and be connected to need add the cross-over connection copper bar, greatly increased material cost like this, increased the equipment operation degree of difficulty simultaneously.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a there is great asymmetry, additional copper to consume the problem that increases and material cost is high, the equipment degree of difficulty is big to the inductance between the three sets of sub-winding in each phase stator winding of above-mentioned current flat wire motor, provides a flat wire stator subassembly and driving motor.

The embodiment of the present invention provides a flat wire stator assembly for an M-phase motor with a rotor pole number of 2 p; the flat wire stator assembly comprises a stator core and M-phase stator windings, wherein N stator slots which are axially arranged are formed in the inner periphery of the stator core, the M-phase stator windings are wound into six layers in the stator slots, and both N, p and M are positive integers; each phase of the M-phase stator windings comprises a sets of sub-windings connected in parallel, wherein a is a positive integer and is not a divisor of 2 p; each set of the sub-windings respectively comprises a first layer and a second layer distributed in the stator slot, coils distributed in a third layer and a fourth layer and coils distributed in a fifth layer and a sixth layer, and the number of the coils distributed in the first layer and the second layer, the number of the coils distributed in the third layer and the fourth layer and the number of the coils distributed in the fifth layer and the sixth layer of the sub-windings are all larger than or equal to 2.

Preferably, each phase of the M-phase stator windings comprises three sets of sub-windings, and each set of sub-windings comprises N coils connected in series, where N is equal to N/3;

the number of the coils of each set of the sub-windings distributed on the first layer and the second layer of the stator slot, the number of the coils distributed on the third layer and the fourth layer of the stator slot and the number of the coils distributed on the fifth layer and the sixth layer of the stator slot are even numbers which are more than or equal to 4.

Preferably, the coil in each set of the sub-windings is arranged along the winding direction of the sub-windings, and the leading-out end of the coil and the leading-in end of the connected coil are positioned on the same layer or adjacent layers of the stator slot; the coil is a U-shaped hairpin copper bar or an I-shaped copper bar.

Preferably, three sets of sub-windings of each phase of the stator winding respectively comprise a first sub-winding, a second sub-winding and a third sub-winding;

the first sub-winding comprises 3n/8 coils distributed in the first layer and the second layer of the stator slot, n/4 coils distributed in the third layer and the fourth layer of the stator slot, and 3n/8 coils distributed in the fifth layer and the sixth layer of the stator slot;

the second sub-winding comprises 3n/8 coils distributed in the first layer and the second layer of the stator slot, n/4 coils distributed in the third layer and the fourth layer of the stator slot, and 3n/8 coils distributed in the fifth layer and the sixth layer of the stator slot;

the third sub-winding comprises n/4 coils distributed on the first layer and the second layer of the stator slot, n/2 coils distributed on the third layer and the fourth layer of the stator slot, and n/4 coils distributed on the fifth layer and the sixth layer of the stator slot.

the first sub-winding comprises n/4 coils distributed in the first layer and the second layer of the stator slot, 3n/8 coils distributed in the third layer and the fourth layer of the stator slot, and 3n/8 coils distributed in the fifth layer and the sixth layer of the stator slot;

the second sub-winding comprises 3n/8 coils distributed in the first layer and the second layer of the stator slot, 3n/8 coils distributed in the third layer and the fourth layer of the stator slot, and n/4 coils distributed in the fifth layer and the sixth layer of the stator slot;

the third sub-winding comprises n/2 coils distributed on the first layer and the second layer of the stator slot, n/4 coils distributed on the third layer and the fourth layer of the stator slot, and n/4 coils distributed on the fifth layer and the sixth layer of the stator slot.

the first sub-winding comprises 3n/8 coils distributed in the first layer and the second layer of the stator slot, 3n/8 coils distributed in the third layer and the fourth layer of the stator slot, and n/4 coils distributed in the fifth layer and the sixth layer of the stator slot;

the third sub-winding comprises n/4 coils distributed on the first layer and the second layer of the stator slot, n/4 coils distributed on the third layer and the fourth layer of the stator slot, and n/2 coils distributed on the fifth layer and the sixth layer of the stator slot.

Preferably, M is 3, p is 4, N is 48;

the first sub-winding comprises a first coil group positioned on a first layer and a second layer of the stator slot, a second coil group positioned on a third layer and a fourth layer of the stator slot, and a third coil group positioned on a fifth layer and a sixth layer of the stator slot;

the second sub-winding comprises a fourth coil group positioned on the first layer and the second layer of the stator slot, a fifth coil group positioned on the third layer and the fourth layer of the stator slot and a sixth coil group positioned on the fifth layer and the sixth layer of the stator slot, and the winding directions of the fourth coil group, the fifth coil group and the sixth coil group are opposite to the winding direction of the first sub-winding;

the third sub-winding comprises a seventh coil group positioned on the first layer and the second layer of the stator slot, an eighth coil group positioned on the first layer and the second layer of the stator slot, a ninth coil group positioned on the third layer and the fourth layer of the stator slot, a tenth coil group positioned on the third layer and the fourth layer of the stator slot, an eleventh coil group positioned on the fifth layer and the sixth layer of the stator slot, and a twelfth coil group positioned on the fifth layer and the sixth layer of the stator slot, the seventh coil group, the ninth coil group and the eleventh coil group are the same as the first sub-winding in winding direction, and the eighth coil group, the tenth coil group and the twelfth coil group are opposite to the first sub-winding in winding direction.

Preferably, the eighth coil group, the seventh coil group, the ninth coil group, the eleventh coil group, the twelfth coil group and the tenth coil group of the third sub-winding are sequentially connected in series, and a phase voltage outgoing line of the third sub-winding is electrically connected to the eighth coil group located at the second layer of the stator slot, and a neutral line outgoing line of the third sub-winding is electrically connected to the ninth coil group located at the third layer of the stator slot;

and the phase voltage outgoing line of the first sub-winding and the neutral line outgoing line of the second sub-winding are respectively connected to the coils positioned on the first layer of the stator slot, and the neutral line outgoing line of the first sub-winding and the phase voltage outgoing line of the second sub-winding are respectively connected to the coils positioned on the sixth layer of the stator slot.

Preferably, the first coil group and the third coil group respectively comprise six equidistant coils, and the six equidistant coils of the first coil group and the third coil group are respectively connected together in series; the second coil group comprises four equidistant coils, and the four equidistant coils of the second coil group are connected together in series; the first coil group, the second coil group and the third coil group are respectively connected in series in sequence through two short-distance coils;

the fourth coil group and the sixth coil group respectively comprise six equidistant coils, and the six equidistant coils of the fourth coil group and the sixth coil group are respectively connected in series; the fifth coil group comprises four equidistant coils, and the four equidistant coils of the fifth coil group are connected together in series; the fourth coil group, the fifth coil group and the sixth coil group are respectively connected in series in sequence through two short-distance coils;

seventh coil group, eighth coil group, eleventh coil group and twelfth coil group include two equidistance coils respectively, ninth coil group and fourth coil group include four equidistance coils respectively, just eighth coil group, seventh coil group, ninth coil group, eleventh coil group, twelfth coil group and tenth coil group are through five short-range coils series connection in proper order respectively.

The embodiment of the utility model provides a still provide a driving motor, including rotor subassembly and as above arbitrary the flat wire stator subassembly.

The utility model discloses flat wire stator subassembly and driving motor have following beneficial effect: the coils of each set of sub-windings are respectively connected in series to the first layer and the second layer, the third layer and the fourth layer, the fifth layer and the sixth layer of the stator slot, and meanwhile, the number of the coils of each set of sub-windings distributed on the first layer and the second layer, the number of the coils distributed on the third layer and the fourth layer, and the number of the coils distributed on the fifth layer and the sixth layer of the stator slot are respectively arranged in a mode of being more than or equal to 2, so that the connection mode can be effectively optimized, the asymmetry of the inductance among the sets of sub-windings of each phase of stator winding is small, the winding circulation is reduced, and the additional copper consumption is reduced; and because each set of sub-winding respectively including the first layer and the second floor that distribute in the stator slot, distribute in third layer and fourth floor, and distribute in the coil on fifth layer and sixth floor, consequently the coil of same set of sub-winding need not to cross the layer and connects, not only can reduce material cost, can also effectively reduce the assembly operation degree of difficulty, and then improve the packaging efficiency.

Drawings

FIG. 1 is a schematic diagram of the topology of the three-phase stator windings in a flat wire stator assembly of a prior art flat wire motor;

fig. 2 is a schematic diagram of a winding structure of three sets of stator windings on a stator core in each phase of stator windings of a conventional flat wire motor;

FIG. 3 is a waveform of current in three sets of stator windings in each phase of a prior art flat wire motor;

fig. 4 is a schematic view of a topology structure of three-phase stator windings in a flat wire stator assembly provided by an embodiment of the present invention;

fig. 5 is a schematic structural view of a cross-section of a coil in a flat wire stator assembly provided by an embodiment of the present invention;

fig. 6 is a schematic view of a winding structure of three sets of stator windings on a stator core in each phase of stator windings of a flat wire stator assembly provided by an embodiment of the present invention;

fig. 7 is a waveform diagram of currents in three sets of sub-windings in three-phase stator windings of a flat wire stator assembly provided by an embodiment of the present invention;

fig. 8 is a schematic view of a winding structure of three sets of stator windings on a stator core in each phase of stator windings of a flat wire stator assembly according to another embodiment of the present invention;

fig. 9 is a schematic structural diagram of a driving motor according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 4, it is the topological structure schematic diagram of three-phase stator winding in the flat wire stator assembly provided by the embodiment of the present invention, this flat wire stator assembly can be applied to the field of electrical equipment, especially in the driving motor of new energy automobile.

As shown in fig. 5, the flat wire stator assembly in this embodiment is mainly applied to a three-phase motor with a rotor pole number of 2p (p is a positive integer). Specifically, the flat wire stator assembly includes a stator core having N (N is a positive integer) axially disposed stator slots 7 on an inner periphery thereof, and three-phase stator windings (e.g., a U-phase stator winding, a V-phase stator winding, and a W-phase stator winding). The three-phase stator winding may be formed by flat wires (the flat wires may specifically include conductors with rectangular cross sections and insulating layers wrapped outside the conductors), and the three-phase stator winding is wound into six layers in the stator slot 7, specifically including a first layer L1, a second layer L2, a third layer L3, a fourth layer L4, a fifth layer L5 and a sixth layer L6, which are sequentially arranged from outside to inside along the radial direction of the motor.

Preferably, each phase of stator winding of the three-phase stator winding includes a (a is a positive integer) sets of sub-windings connected in parallel, and a is not a divisor of 2p, that is, the number of parallel branches of each phase of stator winding is not a divisor of the number of poles of the rotor of the motor, so that the matching of low-speed torque and high-speed power of the motor can be effectively improved, and the motor is suitable for high-speed occasions without increasing the capacity of the inverter, thereby reducing the cost.

Particularly, each set of sub-windings of each phase of stator winding respectively comprises a first layer L1 and a second layer L2 distributed in the stator slot 7, coils distributed in a third layer L3 and a fourth layer L4, and coils distributed in a fifth layer L5 and a sixth layer L6, the number of the coils distributed in the first layer L1 and the second layer L2, the number of the coils distributed in the third layer L3 and the fourth layer L4, and the number of the coils distributed in the fifth layer L5 and the sixth layer L6 of each set of sub-windings are all larger than or equal to 2, the arrangement mode greatly improves the balance of the coil distribution, not only facilitates the winding and assembly of the three-phase stator windings, but also reduces the parallel branch resistance, the inductance imbalance rate and the current imbalance rate of each phase of the stator winding, and has high practicability.

In the flat wire stator assembly, the coils of each set of sub-windings of each phase of stator winding are respectively connected in series to the first layer L1 and the second layer L2, the third layer L3 and the fourth layer L4, the fifth layer L5 and the sixth layer L6 of the stator slot 7, and at the same time, the number of the coils of each set of sub-windings distributed in the first layer L1 and the second layer L2 of the stator slot 7, the number of the coils distributed in the third layer L3 and the fourth layer L4, and the number of the coils distributed in the fifth layer L5 and the sixth layer L6 are respectively arranged in a manner of being greater than or equal to 2, so that the connection manner of the three-phase stator winding can be effectively optimized, the three-phase stator winding is wound with coils in each layer of the stator slot 7, the rationality of the connection manner is improved, and the asymmetry of the inductances among the three sets of the sub-phase of the stator winding is small (that the back-potential, the resistance and the inductances of the sub-windings connected in parallel are, and further reducing additional copper loss generated by circulation among the parallel sub-windings so as to improve the efficiency of the motor and reduce the temperature rise of the stator windings. When the composite material is applied to an electric automobile, the NVH performance can be effectively improved, and the market competitiveness of the electric automobile is improved.

Because each set of sub-winding respectively including distribute in stator slot 7 first layer L1 and second floor L2, distribute in third floor L3 and fourth floor L4, and distribute in fifth floor L5 and sixth floor L6's coil, consequently the coil of same set of sub-winding need not the cross-layer connection, need not to use longer span copper bar to realize establishing ties during the equipment, not only controlled material cost, effectively reduced the assembly operation degree of difficulty, and then can improve above-mentioned flat wire stator module's packaging efficiency.

Particularly, the coils in each set of sub-windings are arranged along the winding direction of the sub-windings respectively, the leading-out end of each coil and the leading-in end of the connected coil are positioned on the same layer or adjacent layers of the stator slot 7, namely the leading-out end of each coil can be directly connected with the leading-in end of the connected coil in series, so that the connection of short-distance coils is not needed, the convenience of series assembly is improved, materials are saved, and the cost is reduced. Of course, two adjacent coils can be connected in series through the short-distance coil, and the specific situation can be determined according to the actual situation.

In practical application, the coil of the three-phase stator winding can be a U-shaped hairpin copper bar, one foot of the U-shaped hairpin copper bar forms a lead-in end, and the other foot of the U-shaped hairpin copper bar forms a lead-out end. During assembly, two pins of the U-shaped hairpin copper bar are directly inserted into two adjacent layers of the stator slot 7 respectively, namely the first layer L1 and the second layer L2, the third layer L3 and the fourth layer L4, or the fifth layer L5 and the sixth layer L6, so that the coil is assembled, the assembly is convenient and fast, and the disassembly, assembly and maintenance are facilitated. Of course, the coils of the three-phase stator winding can also adopt I type (double-end welding) or continuous wave winding (no welding), and the coil can be determined according to actual conditions.

In an embodiment of the present invention, each phase stator winding of the three-phase stator winding includes three sets of sub-windings, and each set of sub-windings includes n coils connected in series. Specifically, N is equal to N/3, and N is a positive integer.

Preferably, the number of coils of each set of sub-windings distributed in the first layer L1 and the second layer L2 of the stator slot 7, the number of coils distributed in the third layer L3 and the fourth layer L4, and the number of coils distributed in the fifth layer L5 and the sixth layer L6 are even numbers greater than or equal to 4, so that the number of coils of each set of sub-windings distributed in the first layer L1 and the second layer L2 of the stator slot 7, the number of coils distributed in the third layer L3 and the fourth layer L4, and the number of coils distributed in the fifth layer L5 and the sixth layer L6 are more uniform, the distribution ratio of the coils on the stator slot 7 is more reasonable, the connection mode of the three-phase stator windings can be further optimized, and the symmetry of the inductance among the three sets of sub-winding groups of each phase stator winding is improved, so as to inhibit the circulation generated between the parallel sub-windings.

Example 1

The three sets of sub-windings of each phase of stator winding respectively comprise a first sub-winding, a second sub-winding and a third sub-winding, and the three-phase stator winding is wound in the following mode:

the first sub-winding of each phase stator winding comprises 3n/8 coils distributed in the first layer L1 and the second layer L2 of the stator slot 7, n/4 coils distributed in the third layer L3 and the fourth layer L4 of the stator slot 7, and 3n/8 coils distributed in the fifth layer L5 and the sixth layer L6 of the stator slot 7.

The second sub-windings of each phase stator winding comprise 3n/8 coils distributed in the first layer L1 and the second layer L2 of the stator slot 7, n/4 coils distributed in the third layer L3 and the fourth layer L4 of the stator slot 7, and 3n/8 coils distributed in the fifth layer L5 and the sixth layer L6 of the stator slot 7.

The third sub-winding of each phase stator winding comprises n/4 coils distributed in the first layer L1 and the second layer L2 of the stator slot 7, n/2 coils distributed in the third layer L3 and the fourth layer L4 of the stator slot 7, and n/4 coils distributed in the fifth layer L5 and the sixth layer L6 of the stator slot 7.

Example 2

the first sub-windings of each phase stator winding comprise n/4 coils distributed in the first layer L1 and the second layer L2 of the stator slots 7, 3n/8 coils distributed in the third layer L3 and the fourth layer L4 of the stator slots 7, and 3n/8 coils distributed in the fifth layer L5 and the sixth layer L6 of the stator slots 7.

The second sub-windings of each phase stator winding comprise 3n/8 coils distributed in the first layer L1 and the second layer L2 of the stator slot 7, 3n/8 coils distributed in the third layer L3 and the fourth layer L4 of the stator slot 7, and n/4 coils distributed in the fifth layer L5 and the sixth layer L6 of the stator slot 7.

The third sub-winding of each phase stator winding comprises n/2 coils distributed in the first layer L1 and the second layer L2 of the stator slot 7, n/4 coils distributed in the third layer L3 and the fourth layer L4 of the stator slot 7, and n/4 coils distributed in the fifth layer L5 and the sixth layer L6 of the stator slot 7.

Example 3

the first sub-windings of each phase stator winding comprise 3n/8 coils distributed in the first layer L1 and the second layer L2 of the stator slots 7, 3n/8 coils distributed in the third layer L3 and the fourth layer L4 of the stator slots 7, and n/4 coils distributed in the fifth layer L5 and the sixth layer L6 of the stator slots 7.

The third sub-winding of each phase stator winding comprises n/4 coils distributed in the first layer L1 and the second layer L2 of the stator slot 7, n/4 coils distributed in the third layer L3 and the fourth layer L4 of the stator slot 7, and n/2 coils distributed in the fifth layer L5 and the sixth layer L6 of the stator slot 7.

In the first embodiment of the present invention, the flat wire stator assembly is applied to a three-phase motor having a rotor pole number of 8, i.e., p is 4. And, the inner periphery of stator core has 48 stator slots 7 that set up axially, and the three-phase stator winding is wound into 6 layers in these 48 stator slots 7.

As shown in fig. 6, which is a detailed wiring diagram of each set of sub-windings in the U-phase windings of the flat wire stator assembly, wherein

reference numerals

1, 2, 3 … … 47, 48 shown therein indicate the number of 48 stator slots 7 (i.e. slot No. 1, slot No. 2, slot No. 3, slot No. … … 47, slot No. 48 of stator slots 7), and the inverted-V mark on each layer represents a coil, and the end connected with the inverted-V dotted line represents the current layer, the end connected with the solid inverted V line represents adjacent layers, here, the adjacent layers are the first layer L1 and the second layer L2, the third layer L3 and the fourth layer L4, the fifth layer L5 and the sixth layer L6, that is, the adjacent layer of the first layer L1 is the second layer L2, the adjacent layer of the second layer L2 is the first layer L1, the adjacent layer of the third layer L3 is the fourth layer L4, the adjacent layer of the fourth layer L4 is the third layer L3, the adjacent layer of the fifth layer L5 is the sixth layer L6, and the adjacent layer of the sixth layer L6 is the fifth layer L5.

Specifically, the first sub-winding U1 includes a first coil group U11 located at the first layer L1 and the second layer L2 of the stator slot 7, a second coil group U13 located at the third layer L3 and the fourth layer L4 of the stator slot 7, and a third coil group U15 located at the fifth layer L5 and the sixth layer L6 of the stator slot 7. Wherein: the first coil group U11, second coil group U13, and third coil group U15 are preferably located in the same slot.

The first coil group U11 and the third coil group U15 respectively comprise six equidistant coils, the second coil group U13 comprises four equidistant coils, and the first coil group U11, the second coil group U13 and the third coil group U15 are sequentially connected together in series through two short-distance coils.

Specifically, the first coil group U11 includes a coil 111, a coil 112, a coil 113, a coil 114, a coil 115, and a coil 116 (i.e., the six equidistant coils) connected in series; the second coil group U13 includes a coil 131, a coil 132, a coil 133, and a coil 134 (i.e., the four equidistant coils) connected in series; the third coil group U15 includes a coil 151, a coil 152, a coil 153, a coil 154, a coil 155, and a coil 156 (i.e., the above-described six equidistant coils) connected in series, respectively.

During assembly, coil 111 is inserted into slot No. 1 of first layer L1 and slot No. 7 of second layer L2, coil 112 is inserted into slot No. 13 of first layer L1 and slot No. 19 of second layer L2, coil 113 is inserted into slot No. 25 of first layer L1 and slot No. 31 of second layer L2, coil 114 is inserted into slot No. 38 of first layer L1 and slot No. 44 of second layer L2, coil 115 is inserted into slot No. 2 of first layer L1 and slot No. 8 of second layer L2, and coil 116 is inserted into slot No. 14 of first layer L1 and slot No. 20 of second layer L2. Then, coil 131 is inserted into groove 26 of third layer L3 and groove 32 of fourth layer L4, coil 132 is inserted into groove 38 of third layer L3 and groove 44 of fourth layer L4, coil 133 is inserted into groove 1 of third layer L3 and groove 7 of fourth layer L4, and coil 134 is inserted into groove 13 of third layer L3 and groove 19 of fourth layer L4. Next, coil 151 is inserted into groove 25 of fifth layer L5 and groove 31 of sixth layer L6, coil 152 is inserted into groove 37 of fifth layer L5 and groove 43 of sixth layer L6, coil 153 is inserted into groove 1 of fifth layer L5 and groove 7 of sixth layer L6, coil 154 is inserted into groove 14 of fifth layer L5 and groove 20 of sixth layer L6, coil 155 is inserted into groove 26 of fifth layer L5 and groove 32 of sixth layer L6, and coil 156 is inserted into groove 38 of fifth layer L5 and groove 44 of sixth layer L6. Finally, coil 111, coil 112, coil 113, coil 114, coil 115, coil 116, coil 131, coil 132, coil 133, coil 134, coil 151, coil 152, coil 153, coil 154, coil 155, and coil 156 are respectively electrically connected in series in sequence (either directly or through a short-distance coil), thereby completing the winding operation of first sub-winding U1.

Phase voltage lead wire U1+ of the first sub-winding U1 is connected to the lead-in end of coil 111 located in the first layer L1 of stator slot 7, and neutral wire lead wire U1-is connected to the lead-out end of coil 156 located in the sixth layer L6 of stator slot 7. Further, the coil 116 of the first coil group U11 is connected in series with the coil 131 of the second coil group U13 through the short range coil 413, and the coil 134 of the second coil group U13 is connected in series with the coil 151 of the third coil group U15 through the short range coil 435. Of course, in practical application, two adjacent coils may be connected by direct welding.

Similarly, the second sub-winding U2 includes a fourth coil group U22 located in the first layer L1 and the second layer L2 of the stator slot 7, a fifth coil group U24 located in the third layer L3 and the fourth layer L4 of the stator slot 7, and a sixth coil group U26 located in the fifth layer L5 and the sixth layer L6 of the stator slot 7, and the fourth coil group U22, the fifth coil group U24 and the sixth coil group U26 are opposite to the winding direction of the first sub-winding U1. In practical applications, it is preferable that the partial coils of the fourth coil group U22, the fifth coil group U24, and the sixth coil group U26 are located in the same slot, and the other part is located in an adjacent slot.

The fourth coil group U22 and the sixth coil group U26 respectively include six equidistant coils, the fifth coil group U24 includes four equidistant coils, and the fourth coil group U22, the fifth coil group U24 and the sixth coil group U26 are respectively connected in series in turn by two short-distance coils.

Specifically, the fourth coil group U22 includes a coil 221, a coil 222, a coil 223, a coil 224, a coil 225, and a coil 226 (i.e., the six equidistant coils) connected in series; the fifth coil group U24 includes a coil 241, a coil 242, a coil 243, and a coil 244 (i.e., the four equidistant coils mentioned above) connected in series; the sixth coil group U26 includes a coil 261, a coil 262, a coil 263, a coil 264, a coil 265, and a coil 266 (i.e., the above-mentioned six equidistant coils) connected in series, respectively.

During assembly, coil 261 is inserted into groove No. 1 of sixth layer L6 and groove No. 43 of fifth layer L5, coil 262 is inserted into groove No. 37 of sixth layer L6 and groove No. 31 of fifth layer L5, coil 263 is inserted into groove No. 25 of sixth layer L6 and groove No. 19 of fifth layer L5, coil 264 is inserted into groove No. 14 of sixth layer L6 and groove No. 8 of fifth layer L5, coil 265 is inserted into groove No. 2 of sixth layer L6 and groove No. 44 of fifth layer L5, and coil 266 is inserted into groove No. 38 of sixth layer L6 and groove No. 32 of L5. Then, coil 241 is inserted into groove 26 of fourth layer L4 and groove 20 of third layer L3, coil 242 is inserted into groove 14 of fourth layer L4 and groove 8 of third layer L3, coil 243 is inserted into groove 1 of fourth layer L4 and groove 43 of third layer L3, and coil 244 is inserted into groove 37 of fourth layer L4 and groove 31 of third layer L3. Next, coil 221 is inserted into slot No. 25 of second layer L2 and slot No. 19 of first layer L1, coil 222 is inserted into slot No. 13 of second layer L2 and slot No. 7 of first layer L1, coil 223 is inserted into slot No. 1 of second layer L2 and slot No. 43 of first layer L1, coil 224 is inserted into slot No. 38 of second layer L2 and slot No. 32 of first layer L1, coil 225 is inserted into slot No. 26 of second layer L2 and slot No. 20 of first layer L1, and coil 226 is inserted into slot No. 14 of second layer L2 and slot No. 8 of first layer L1. Finally, the coil 261, the coil 262, the coil 263, the coil 264, the coil 265, the coil 266, the coil 241, the coil 242, the coil 243, the coil 244, the coil 221, the coil 222, the coil 223, the coil 224, the coil 225 and the coil 226 are respectively connected in series in turn in an electrically conductive connection (which can be directly connected or connected through a short-distance coil), and the winding operation of the second sub-winding U2 is completed.

Phase voltage lead wire U2+ of the second sub-winding U2 is connected to the lead-in end of coil 261 at sixth layer L6 of stator slot 7, and neutral lead wire U2-is connected to the lead-out end of coil 226 at first layer L1 of stator slot 7. Further, the coil 266 of the sixth coil group U26 is connected in series with the coil 241 of the fifth coil group U24 through the short-range coil 564, and the coil 244 of the fifth coil group U24 is connected in series with the coil 221 of the fourth coil group U22 through the short-range coil 542. Of course, in practical application, two adjacent coils may be connected by direct welding.

Further, third sub-winding U3 includes seventh coil group U31 located in first layer L1 and second layer L2 of stator slot 7, eighth coil group U32 located in first layer L1 and second layer L2 of stator slot 7, ninth coil group U5928 located in third layer L3 and fourth layer L4 of stator slot 7, tenth coil group U34 located in third layer L3 and fourth layer L4 of stator slot 7, eleventh coil group U35 located in fifth layer L5 and sixth layer L6 of stator slot 7, and twelfth coil group U36 located in fifth layer L5 and sixth layer L6 of stator slot 7, wherein the winding directions of seventh coil group U36, ninth coil group U36 and eleventh coil group U36 are the same as the winding direction of first sub-winding U36, and the winding directions of eighth coil group U36, tenth coil group U36 and twelfth coil group U36 are opposite to the winding directions of first coil group U36.

The seventh coil group U31, the eighth coil group U32, the eleventh coil group U35 and the twelfth coil group U36 respectively include two equidistant coils, the ninth coil group U33 and the fourth coil group U34 respectively include four equidistant coils, and the eighth coil group U32, the seventh coil group U31, the ninth coil group U33, the eleventh coil group U35, the twelfth coil group U36 and the tenth coil group U34 are sequentially connected in series through five short-distance coils.

Specifically, the seventh coil group U31 includes a coil 311 and a coil 312 (i.e., the two equidistant coils) connected in series; the eighth coil group U32 includes a coil 321 and a coil 322 (i.e., the two equidistant coils) connected in series; the ninth coil group U33 includes a coil 331, a coil 332, a coil 333 and a coil 334 (i.e., the four equidistant coils mentioned above) which are respectively connected in series; the tenth coil group U34 includes a coil 341, a coil 342, a coil 343, and a coil 344 (i.e., the four equidistant coils described above) connected in series, respectively; the eleventh coil group U35 includes a coil 351 and a coil 352 (i.e., the two equidistant coils mentioned above) respectively connected in series; the twelfth coil group U36 includes a coil 361 and a coil 362 (i.e., the two equidistant coils mentioned above) respectively connected in series.

During assembly, the coil 321 is inserted into the No. 2 slot of the second layer L2 and the No. 44 slot of the first layer L1, and the coil 322 is inserted into the No. 37 slot of the second layer L2 and the No. 31 slot of the first layer L1. The coil 311 was inserted into the 26 th groove of the first layer L1 and the 32 th groove of the second layer L2, and the coil 312 was inserted into the 37 th groove of the first layer L1 and the 43 th groove of the second layer L2. Then, coil 331 is inserted into groove No. 2 of third layer L3 and groove No. 8 of fourth layer L4, coil 332 is inserted into groove No. 14 of third layer L3 and groove No. 20 of fourth layer L4, coil 333 is inserted into groove No. 25 of third layer L3 and groove No. 31 of fourth layer L4, and coil 334 is inserted into groove No. 37 of third layer L3 and groove No. 43 of fourth layer L4. The coil 351 is inserted into the groove No. 2 of the fifth layer L5 and the groove No. 8 of the sixth layer L6, and the coil 352 is inserted into the groove No. 13 of the fifth layer L5 and the groove No. 19 of the sixth layer L6. Next, the coil 361 was inserted into the 26 th groove of the sixth layer L6 and the 20 th groove of the fifth layer L5, and the coil 362 was inserted into the 13 th groove of the sixth layer L6 and the 7 th groove of the fifth layer L5. Coil 341 is inserted into groove No. 2 of fourth layer L4 and groove No. 44 of third layer L3, coil 342 is inserted into groove No. 38 of fourth layer L4 and groove No. 32 of third layer L3, coil 343 is inserted into groove No. 25 of fourth layer L4 and groove No. 19 of third layer L3, and coil 344 is inserted into groove No. 13 of fourth layer L4 and groove No. 7 of third layer L3. Finally, the

coils

321, 322, 311, 312, 331, 332, 333, 334, 351, 352, 361, 362, 341, 342, 343 and 344 are respectively electrically connected in sequence (either directly or through short-distance coils) and connected in series, that is, the eighth coil group U32, the seventh coil group U31, the ninth coil group U33, the eleventh coil group U35, the twelfth coil group U36 and the tenth coil group U34 are respectively connected in series in sequence, so as to complete the winding operation of the third sub-winding U3.

And phase voltage lead wire U3+ of the third sub-winding U3 is conductively connected to the lead-in end of coil 321 located at the second layer L2 of stator slot 7, and neutral lead wire U3-is conductively connected to the lead-out end of coil 344 located at the third layer L3 of stator slot 7.

Further, the coil 322 of the above-mentioned eighth coil group U32 is connected in series with the coil 311 of the seventh coil group U31 through the short range coil 621, the coil 312 of the seventh coil group U31 is connected in series with the coil 331 of the ninth coil group U33 through the short range coil 613, the coil 334 of the ninth coil group U33 is connected in series with the coil 351 of the eleventh coil group U35 through the short range coil 635, the coil 352 of the eleventh coil group U35 is connected in series with the coil 361 of the twelfth coil group U36 through the short range coil 656, and the coil 362 of the twelfth coil group U36 is connected in series with the coil 341 of the tenth coil group U34 through the short range coil 664. Of course, in practical application, two adjacent coils may be connected by direct welding.

The flat wire stator assembly has higher symmetry of inductance among the sets of sub-windings of each phase of stator winding by arranging the ninth coil group U33 and the tenth coil group U34 on the third layer L3 and the fourth layer L4 through the third sub-winding U3.

As shown in fig. 7, compared with the winding connection manner of the conventional flat wire motor (as shown in fig. 2 and 3), the parallel sub-winding currents of each phase of stator winding of the flat wire stator assembly are basically overlapped, so that the circulating current generated between the parallel sub-windings is greatly suppressed, the additional alternating current copper consumption under high frequency is greatly reduced, the motor efficiency in high-speed operation is improved, the local over-temperature of the winding is avoided, and the service life of the motor is prolonged.

In another embodiment of the present invention, as shown in fig. 8, the first sub-winding U1 is wound and assembled in the following manner: coil 111 was inserted into groove No. 1 of first layer L1 and groove No. 7 of second layer L2, coil 112 was inserted into groove No. 14 of first layer L1 and groove No. 20 of second layer L2, coil 113 was inserted into groove No. 25 of first layer L1 and groove No. 31 of second layer L2, coil 114 was inserted into groove No. 38 of first layer L1 and groove No. 44 of second layer L2, coil 115 was inserted into groove No. 2 of first layer L1 and groove No. 8 of second layer L2, and coil 116 was inserted into groove No. 13 of first layer L1 and groove No. 19 of second layer L2.

Then, coil 131 is inserted into groove 25 of third layer L3 and groove 31 of fourth layer L4, coil 132 is inserted into groove 38 of third layer L3 and groove 44 of fourth layer L4, coil 133 is inserted into groove 1 of third layer L3 and groove 7 of fourth layer L4, and coil 134 is inserted into groove 14 of third layer L3 and groove 20 of fourth layer L4. Next, coil 151 is inserted into groove 26 of fifth layer L5 and groove 32 of sixth layer L6, coil 152 is inserted into groove 37 of fifth layer L5 and groove 43 of sixth layer L6, coil 153 is inserted into groove 2 of fifth layer L5 and groove 8 of sixth layer L6, coil 154 is inserted into groove 13 of fifth layer L5 and groove 19 of sixth layer L6, coil 155 is inserted into groove 25 of fifth layer L5 and groove 31 of sixth layer L6, and coil 156 is inserted into groove 38 of fifth layer L5 and groove 44 of sixth layer L6.

Finally, coil 111, coil 112, coil 113, coil 114, coil 115, coil 116, coil 131, coil 132, coil 133, coil 134, coil 151, coil 152, coil 153, coil 154, coil 155, and coil 156 are respectively electrically connected in series in sequence (either directly or through a short-distance coil), thereby completing the winding operation of first sub-winding U1.

The second sub-winding U2 is assembled by the following winding devices: coil 261 is first inserted into groove No. 1 of sixth layer L6 and groove No. 43 of fifth layer L5, coil 262 is inserted into groove No. 38 of sixth layer L6 and groove No. 32 of fifth layer L5, coil 263 is inserted into groove No. 25 of sixth layer L6 and groove No. 19 of fifth layer L5, coil 264 is inserted into groove No. 14 of sixth layer L6 and groove No. 8 of fifth layer L5, coil 265 is inserted into groove No. 2 of sixth layer L6 and groove No. 44 of fifth layer L5, and coil 266 is inserted into groove No. 37 of sixth layer L6 and groove No. 31 of fifth layer L5.

Then, coil 241 is inserted into groove 25 of fourth layer L4 and groove 19 of third layer L3, coil 242 is inserted into groove 14 of fourth layer L4 and groove 8 of third layer L3, coil 243 is inserted into groove 1 of fourth layer L4 and groove 43 of third layer L3, and coil 244 is inserted into groove 38 of fourth layer L4 and groove 32 of third layer L3.

Next, coil 221 is inserted into groove 26 of second layer L2 and groove 20 of first layer L1, coil 222 is inserted into groove 13 of second layer L2 and groove 7 of first layer L1, coil 223 is inserted into groove 2 of second layer L2 and groove 44 of first layer L1, coil 224 is inserted into groove 37 of second layer L2 and groove 31 of first layer L1, coil 225 is inserted into groove 25 of second layer L2 and groove 19 of first layer L1, and coil 226 is inserted into groove 14 of second layer L2 and groove 8 of first layer L1.

Finally, the coil 261, the coil 262, the coil 263, the coil 264, the coil 265, the coil 266, the coil 241, the coil 242, the coil 243, the coil 244, the coil 221, the coil 222, the coil 223, the coil 224, the coil 225 and the coil 226 are respectively connected in series in turn in an electrically conductive connection (which can be directly connected or connected through a short-distance coil), and the winding operation of the second sub-winding U2 is completed.

The third sub-winding U3 is assembled by the following winding devices: the coil 321 was inserted into the No. 1 slot of the second layer L2 and the No. 43 slot of the first layer L1, and the coil 322 was inserted into the No. 38 slot of the second layer L2 and the No. 32 slot of the first layer L1. The coil 311 was inserted into the 26 th groove of the first layer L1 and the 32 th groove of the second layer L2, and the coil 312 was inserted into the 37 th groove of the first layer L1 and the 43 th groove of the second layer L2. Then, coil 331 is inserted into groove No. 2 of third layer L3 and groove No. 8 of fourth layer L4, coil 332 is inserted into groove No. 13 of third layer L3 and groove No. 19 of fourth layer L4, coil 333 is inserted into groove No. 26 of third layer L3 and groove No. 32 of fourth layer L4, and coil 334 is inserted into groove No. 37 of third layer L3 and groove No. 43 of fourth layer L4. The coil 351 is inserted into the slot No. 1 of the fifth layer L5 and the slot No. 7 of the sixth layer L6, and the coil 352 is inserted into the slot No. 14 of the fifth layer L5 and the slot No. 20 of the sixth layer L6. Next, the coil 361 was inserted into the 26 th groove of the sixth layer L6 and the 20 th groove of the fifth layer L5, and the coil 362 was inserted into the 13 th groove of the sixth layer L6 and the 7 th groove of the fifth layer L5. Coil 341 is inserted into groove No. 2 of fourth layer L4 and groove No. 44 of third layer L3, coil 342 is inserted into groove No. 37 of fourth layer L4 and groove No. 31 of third layer L3, coil 343 is inserted into groove No. 26 of fourth layer L4 and groove No. 20 of third layer L3, and coil 344 is inserted into groove No. 13 of fourth layer L4 and groove No. 7 of third layer L3. Finally, the

coils

As shown in fig. 9, the embodiment of the present invention further provides a driving motor, which includes a rotor assembly a1 and the flat wire stator assembly a2 as described above.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A flat wire stator component is applied to an M-phase motor with the rotor pole number of 2 p; the flat wire stator assembly comprises a stator core and M-phase stator windings, wherein N stator slots which are axially arranged are formed in the inner periphery of the stator core, the M-phase stator windings are wound into six layers in the stator slots, and both N, p and M are positive integers; each phase of stator winding of the M-phase stator winding comprises a sets of sub-windings connected in parallel, wherein a is a positive integer and is not a divisor of 2 p; each set of the sub-windings respectively comprises a first layer and a second layer distributed in the stator slot, coils distributed in a third layer and a fourth layer and coils distributed in a fifth layer and a sixth layer, and the number of the coils distributed in the first layer and the second layer, the number of the coils distributed in the third layer and the fourth layer and the number of the coils distributed in the fifth layer and the sixth layer of the sub-windings are all larger than or equal to 2.

2. The flat wire stator assembly of claim 1, wherein each of said M phase stator windings comprises three sets of sub-windings, and each of said sets of sub-windings comprises N coils connected in series, said N being equal to N/3;

3. The flat wire stator assembly of claim 2, wherein the coils in each set of the sub-windings are respectively arranged along the winding direction of the sub-windings, and the leading-out ends of the coils and the leading-in ends of the connected coils are located at the same layer or adjacent layers of the stator slots; the coil is a U-shaped hairpin copper bar or an I-shaped copper bar.

4. The flat wire stator assembly of claim 2 wherein the three sets of sub-windings of each phase of the stator winding comprise a first sub-winding, a second sub-winding, and a third sub-winding, respectively;

5. The flat wire stator assembly of claim 2 wherein the three sets of sub-windings of each phase of the stator winding comprise a first sub-winding, a second sub-winding, and a third sub-winding, respectively;

6. The flat wire stator assembly of claim 2 wherein the three sets of sub-windings of each phase of the stator winding comprise a first sub-winding, a second sub-winding, and a third sub-winding, respectively;

7. The flat wire stator assembly of claim 4 wherein said M is 3, said p is 4, said N is 48;

8. The flat wire stator assembly according to claim 7, wherein the eighth, seventh, ninth, eleventh, twelfth and tenth coil sets of the third sub-winding are respectively connected in series in that order, and the phase voltage lead-out wire of the third sub-winding is electrically connected to the eighth coil set located at the second level of the stator slots and the neutral lead-out wire is electrically connected to the ninth coil set located at the third level of the stator slots;

9. The flat wire stator assembly of claim 7 or 8 wherein the first and third coil sets each comprise six equally-spaced coils, and the six equally-spaced coils of the first and third coil sets are each connected together in series; the second coil group comprises four equidistant coils, and the four equidistant coils of the second coil group are connected together in series; the first coil group, the second coil group and the third coil group are respectively connected in series in sequence through two short-distance coils;

10. A drive motor comprising a rotor assembly and the flat wire stator assembly of any of claims 1-9.