A flat wire stator for a vehicle permanent magnet synchronous motor

Abstract

The present invention provides a flat wire stator for a vehicle permanent magnet synchronous motor, belonging to the technical field of motors. It solves the problem of the relatively low production efficiency of existing motor stators. This flat wire stator for a vehicle permanent magnet synchronous motor includes a stator core and a main coil. There are 12n coil slots circumferentially on the stator core, where n is a positive integer. Each coil slot is sequentially divided into 4k layers in the radial direction of the stator core, where k is a positive integer, and each adjacent two layers form a coil slot group. The main coil is arranged in k main coil layers along the radial direction of the stator core. The k main coil layers respectively correspond to k coil slot groups, and one end of the main coil is embedded in the outer layer of the coil slot group, and the other end is embedded in the inner layer of the coil slot group. The k main coil layers are concentrated in 9n consecutive coil slots. There are secondary coil layers for paralleling the main coil layers and two sets of lead-out wires for paralleling the main coil layers provided on the stator core. The structure of this flat wire stator for a vehicle permanent magnet synchronous motor can improve the production efficiency of the stator of this type of motor.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and relates to a motor stator, in particular to a flat wire stator of a vehicle-mounted permanent magnet synchronous motor. Background Art

[0002] With the development of new energy electric vehicle technology, the performance requirements for electric vehicle drive motors are also getting higher and higher, and the power density requirements for drive motors are continuously increasing. Compared with other types of motors such as three-phase asynchronous motors and switched reluctance motors, the three-phase permanent magnet synchronous motor has advantages such as a higher efficiency range, a smaller structural size, and a higher power density, making the three-phase permanent magnet synchronous motor more and more favored by electric vehicle manufacturers. At present, the stator windings in the three-phase permanent magnet synchronous motors used in new energy vehicle drives are generally made of enameled round copper wires. With the prevalence of the concept of high winding density, the slot fill factor of the motor is required to be higher and higher, and the application technology of round copper wires has been difficult to meet the new performance requirements of drive motors, and the problem of performance bottlenecks has quietly emerged. Compared with round copper wire motors, the slot fill factor of flat copper wire motors is much better than the former, which will greatly reduce the loss of copper wires, and thus effectively reduce the heat generation of the motor and improve the efficiency.

[0003] For example, the Chinese Patent Network discloses a stator structure of a flat wire motor [Application Publication Number: CN109149829A], which includes a stator core, a stator winding, an outgoing line terminal and a bus bar. The stator winding is wound with flat copper wires, and the bus bar is fixed at the winding welding point and is electrically connected to the welding point.

[0004] Although the above structure can meet the requirements of the motor slot fill factor, there are still the following problems: This patent only has multiple coil slots opened on the stator core, and the coil slots are sequentially divided into 2 layers in the radial direction of the stator core. Therefore, when setting the stator winding, there will be no bending. However, for structures with 4 layers, 8 layers, etc. in the coil slots, the above structure is not applicable, resulting in too many types of coils in the stator winding. When the stator winding is processed and manufactured, different types of stator coils are sequentially installed on the stator core by a robot, making the manufacturing process of the stator winding numerous, the manufacturing efficiency of the stator winding low, not conducive to mass production, and reducing the production efficiency of the motor stator.

[0005] In order to improve the manufacturing efficiency and mass production of stator windings, it is generally conceivable in this field to distribute the lead wires centrally. However, after adopting this layout method, when the stator coils are arranged on the stator core, the stator coils may cross and overlap, making the wiring method of the stator coils complex. In order to simplify the wiring method of the stator coils, it is conceivable in this field to reduce the types of stator coils. A number of lead wires on the stator winding are distributed circumferentially along the stator winding, and the distribution of the number of lead wires is relatively scattered, resulting in a larger volume of the bus bar used to connect the lead wires. On the one hand, it increases the difficulty of processing and manufacturing the bus bar, and on the other hand, it causes the volume of the motor to increase, further reducing the production efficiency of the motor stator. Summary of the Invention

[0006] The object of the present invention is to propose a flat wire stator for a vehicle permanent magnet synchronous motor in view of the above problems existing in the prior art. The technical problem to be solved by the present invention is: how to improve the production efficiency of the motor stator.

[0007] The object of the present invention can be achieved by the following technical solutions:

[0008] A flat wire stator for a vehicle permanent magnet synchronous motor includes a stator core and a main coil. The stator core has 12n coil slots circumferentially, where n is a positive integer. Each coil slot is sequentially divided into 4k layers in the radial direction of the stator core, where k is a positive integer. And each adjacent two layers form a coil slot group. The main coil is arranged in k main coil layers along the radial direction of the stator core. The k main coil layers respectively correspond to k coil slot groups. And one end of the main coil is embedded in the outer layer of the coil slot group, and the other end is embedded in the inner layer of the coil slot group. The k main coil layers are concentrated in 9n consecutive coil slots. The stator core is provided with a secondary coil layer for paralleling the main coil layers and two sets of lead wires for paralleling the main coil layers. Each set of lead wires has 3n, and each set of lead wires is respectively arranged in another 3n coil slots.

[0009] The main coil layer is divided into four layers. The coil slots along the radial direction of the stator core are divided into 4k layers in total, and the coil slot groups are also divided into k layers, and each coil slot group has two layers. Therefore, every two layers form a coil slot group. At this time, each main coil layer can be embedded into the corresponding coil slot group. Therefore, only one type of coil is used in the above-mentioned main coil layer, which makes the production of the main coil layer convenient; and by connecting k main coil layers in parallel through the secondary coil layer and two sets of lead wires, the k main coil layers are concentrated in 9n coil slots. It can be obtained that both ends of each main coil are arranged across the same number of coil slots, and a continuous layer position of 3n coil slots is reserved for each layer. Among these continuous 3n coil slot layer positions, two sets of layer positions can be selected for the lead wires to pass through, so as to achieve the purpose of concentrating the lead wires; by adopting the above wiring method, not only can the production of the main coil layer be convenient, but also the lead wires can be concentrated, reducing the volume of the bus bar connected to the lead wires. On the one hand, it reduces the difficulty of manufacturing the bus bar, and on the other hand, it reduces the volume of the motor, and further improves the production efficiency of the flat wire stator of the vehicle-mounted permanent magnet synchronous motor.

[0010] In the above-mentioned flat wire stator of the vehicle-mounted permanent magnet synchronous motor, n is 4, the coil slots are 48, k is 2, and each coil slot is divided into 8 layers along the radial direction of the stator core.

[0011] Since the coil slots are specifically 48 slots, the specific distribution of the main coils is as follows: for the first layer, both ends of the main coil of this layer are respectively arranged in the first coil slot group, and one end of the main coil is embedded in the first layer of the coil slot, and the other end of the main coil is embedded in the second layer of the coil slot; for the second layer, both ends of the main coil of this layer are respectively arranged in the second coil slot group, and one end of the main coil is embedded in the third layer of the coil slot, and the other end of the main coil is embedded in the fourth layer of the coil slot; for the third layer, both ends of the main coil of this layer are respectively arranged in the third coil slot group, and one end of the main coil is embedded in the fifth layer of the coil slot, and the other end of the main coil is embedded in the sixth layer of the coil slot; for the fourth layer, both ends of the main coil of this layer are respectively arranged in the fourth coil slot group, and one end of the main coil is embedded in the seventh layer of the coil slot, and the other end of the main coil is embedded in the eighth layer of the coil slot; Therefore, only one type of coil is used in the above-mentioned main coil layer. It can be obtained that both ends of each main coil are arranged across 5 coil slots, which makes the winding of the main coil clearer, so as to achieve the convenience of producing the main coil layer and further improve the production efficiency of the flat wire stator of the vehicle-mounted permanent magnet synchronous motor.

[0012] In the above-mentioned flat wire stator of the vehicle-mounted permanent magnet synchronous motor, one set of lead wires is arranged in the outermost layer of 12 coil slots, and the other set of lead wires is arranged in the innermost layer of 12 coil slots.

[0013] The two sets of lead wires are respectively arranged on the outermost layer and the innermost layer of the coil slots, which facilitates the installation of the lead wires, makes the arrangement position of the lead wires more concentrated, reduces the volume of the bus bar, thereby achieving the effects of reducing the production difficulty of the bus bar and the volume of the motor, and improving the production efficiency of the flat wire stator of the vehicle-mounted permanent magnet synchronous motor. Moreover, with the lead wires concentrated, the copper wire loss can be further reduced, the power of the flat wire stator of the vehicle-mounted permanent magnet synchronous motor can be increased, and its performance can be improved.

[0014] In the above-mentioned flat wire stator of the vehicle-mounted permanent magnet synchronous motor, the secondary coil layer includes a secondary coil layer one, and the secondary coil layer one includes 12 secondary coils one arranged at intervals along the circumferential direction of the stator core. One end of each secondary coil one is inserted into the second layer of one of the coil slots, and the other end of each secondary coil one is inserted into the third layer of another coil slot. Each secondary coil one spans 5 coil slots.

[0015] The secondary coil layer one can fill the second layer and the third layer in the remaining 12 coil slots, and with the same kind of secondary coil one, the winding height of the entire secondary coil layer one is the same, which can meet the slot fill factor requirement and make the installation of the secondary coil layer one convenient, further improving the production efficiency of the flat wire stator of the vehicle-mounted permanent magnet synchronous motor.

[0016] In the above-mentioned flat wire stator of the vehicle-mounted permanent magnet synchronous motor, the secondary coil layer includes a secondary coil layer three, and the secondary coil layer three includes 12 secondary coils three arranged at intervals along the circumferential direction of the stator core. One end of each secondary coil three is inserted into the sixth layer of one of the coil slots, and the other end of each secondary coil one is inserted into the seventh layer of another coil slot. Each secondary coil three spans 5 coil slots.

[0017] The secondary coil layer three can fill the sixth layer and the seventh layer in the remaining 12 coil slots, and with the same kind of secondary coil three, the winding height of the entire secondary coil layer three is the same, which can meet the slot fill factor requirement and make the installation of the secondary coil layer three convenient, further improving the production efficiency of the flat wire stator of the vehicle-mounted permanent magnet synchronous motor.

[0018] In the above-mentioned flat wire stator of the vehicle-mounted permanent magnet synchronous motor, the secondary coil layer includes a secondary coil layer two, and the secondary coil layer two includes 6 secondary coils two and 6 secondary coils four. One end of each secondary coil two is inserted into the fourth layer of one of the coil slots, and the other end of each secondary coil two is inserted into the fifth layer of another coil slot. Each secondary coil two spans 4 coil slots; one end of each secondary coil four is inserted into the fourth layer of one of the coil slots, and the other end of each secondary coil four is inserted into the fifth layer of another coil slot. Each secondary coil four spans 6 coil slots.

[0019] When installing the secondary coil two and the secondary coil four, since the secondary coil two straddles 4 coil slots and the secondary coil four straddles 6 coil slots, and each secondary coil two is located below the corresponding secondary coil four, the winding height of the secondary coil two can be further reduced, thereby reducing the copper wire loss of the secondary coil two. Only the secondary coil four is exposed in the secondary coil layer two, which plays a role in protecting the secondary coil two and further improves the stability of the use of the flat wire stator of the vehicle-mounted permanent magnet synchronous motor.

[0020] In the above-mentioned flat wire stator of the vehicle-mounted permanent magnet synchronous motor, one set of lead wires, the secondary coil layer one, the secondary coil layer two, the secondary coil layer three, and the other set of lead wires are arranged in sequence from outside to inside along the radial direction of the stator core.

[0021] This structure is arranged such that the arrangement of the two sets of lead wires, the secondary coil layer one, the secondary coil layer two, and the secondary coil layer three is simple and there is no cross phenomenon during the arrangement, which further improves the production efficiency of the flat wire stator of the vehicle-mounted permanent magnet synchronous motor.

[0022] In the above-mentioned flat wire stator of the vehicle-mounted permanent magnet synchronous motor, the flat wire stator of the vehicle-mounted permanent magnet synchronous motor further includes a star point busbar and three three-phase busbars. The star point busbar has 12 connection terminals one, and the 12 connection terminals one correspond to and are fixedly connected to one set of lead wires one by one; each three-phase busbar has 4 connection terminals two, and the 12 connection terminals two correspond to and are fixedly connected to the other set of lead wires one by one; the star point busbar is electrically connected to the three three-phase busbars, and each three-phase busbar is connected with an output phase wire.

[0023] The star point busbar can be connected to 12 lead wires, and each three-phase busbar can be connected to 4 lead wires. When the flat wire stator of the vehicle-mounted permanent magnet synchronous motor is running, the 12 lead wires are integrated through the star point busbar and electrically connected to the three-phase busbars. The star point busbar can converge the 12 lead wires into a point and connect them to the three-phase busbars. At this time, 4 lead wires are connected to each three-phase busbar, and then they are led out through the output phase wires connected to each three-phase busbar, which further improves the power of the flat wire stator of the vehicle-mounted permanent magnet synchronous motor.

[0024] In the above-mentioned flat wire stator of the vehicle-mounted permanent magnet synchronous motor, a temperature sensor is provided on the star point busbar.

[0025] This structure is arranged to avoid the damage of the motor caused by overheating during the operation of the motor and improve the stability of the motor operation.

[0026] In the above-mentioned flat wire stator of the vehicle-mounted permanent magnet synchronous motor, the flat wire stator of the vehicle-mounted permanent magnet synchronous motor further includes an insulator integrally formed by injection molding with the star point busbar and the three three-phase busbars.

[0027] By setting an insulator, the insulation effect between the star point busbar and the three three-phase busbars is enhanced, avoiding the occurrence of short circuits, and further improving the stability of the use of the flat wire stator of the vehicle-mounted permanent magnet synchronous motor.

[0028] Compared with the prior art, the flat wire stator of the vehicle-mounted permanent magnet synchronous motor of the present invention has the following advantages:

[0029] 1. By setting five types of stator coils, compared with the prior art, the types of stator coils are significantly reduced, the manufacturing process of the stator winding is reduced, the manufacturing efficiency of the stator winding is improved, which is conducive to mass production, and thus the production efficiency of the flat wire stator of the vehicle-mounted permanent magnet synchronous motor is improved.

[0030] 2. By respectively arranging two groups of lead wires on the outermost layer and the innermost layer of the coil slot, the installation of the lead wires is facilitated, the setting position of the lead wires is more concentrated, the volume of the busbar is reduced, thereby achieving the effects of reducing the production difficulty of the busbar and reducing the volume of the motor, and improving the production efficiency of the flat wire stator of the vehicle-mounted permanent magnet synchronous motor.

[0031] 3. When installing the secondary coil two and the secondary coil four, since each secondary coil two straddles 4 coil slots and each secondary coil four straddles 6 coil slots, and each secondary coil two is located below the corresponding secondary coil four, at this time, the winding height of the secondary coil two can be further reduced, and thus the copper wire loss of the secondary coil two can be reduced. Description of the Drawings

[0032] Figure 1 is a schematic structural diagram of the flat wire stator of the vehicle-mounted permanent magnet synchronous motor.

[0033] Figure 2 is a schematic structural diagram of the main coil in the flat wire stator of the vehicle-mounted permanent magnet synchronous motor.

[0034] Figure 3 is a top view of the main coil layer in the flat wire stator of the vehicle-mounted permanent magnet synchronous motor.

[0035] Figure 4 is a top view of the assembled secondary coil layer one in the flat wire stator of the vehicle-mounted permanent magnet synchronous motor.

[0036] Figure 5 is a top view of the assembled secondary coil layer three in the flat wire stator of the vehicle-mounted permanent magnet synchronous motor.

[0037] Figure 6 is a top view of the assembled secondary coil two in the secondary coil layer two of the flat wire stator of the vehicle-mounted permanent magnet synchronous motor.

[0038] Figure 7 is a top view of the assembled secondary coil four in the secondary coil layer two of the flat wire stator of the vehicle-mounted permanent magnet synchronous motor.

[0039] Figure 8 It is a partial structural schematic diagram after the installation of the neutral point busbar, three-phase busbar and stator core in the flat wire stator of the permanent magnet synchronous motor for this vehicle.

[0040] Figure 9 It is a partial structural schematic diagram of the flat wire stator of the permanent magnet synchronous motor for this vehicle.

[0041] Figure 10 It is a structural schematic diagram after the assembly of the lead wire on the flat wire stator of the permanent magnet synchronous motor for this vehicle.

[0042] Figure 11 It is a cross-sectional view of the neutral point busbar, three-phase busbar and insulator after injection molding in the flat wire stator of the permanent magnet synchronous motor for this vehicle.

[0043] In the figure, 1 is the stator core; 1a is the coil slot; 2 is the main coil layer; 21 is the main coil; 22 is the insertion section; 23 is the connection section; 3 is the first secondary coil layer; 31 is the first secondary coil; 4 is the second secondary coil layer; 41 is the second secondary coil; 42 is the fourth secondary coil; 5 is the third secondary coil layer; 51 is the third secondary coil; 6 is the lead wire; 9 is the neutral point busbar; 91 is the first connection terminal; 10 is the three-phase busbar; 101 is the second connection terminal; 11 is the lead phase wire; 12 is the temperature sensor; 13 is the insulator. Specific embodiments

[0044] The following are specific embodiments of the present invention and in combination with the attached drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0045] As Figure 1 shown, the flat wire stator of the permanent magnet synchronous motor for this vehicle includes a stator core 1 and a main coil 21. There are 48 coil slots 1a on the stator core 1. Each coil slot 1a is divided into 8 layers in sequence from the inside to the outside in the radial direction of the stator core 1. The coil slots 1a are arranged along the circumferential direction of the stator core 1 and form four coil slot groups. Each coil slot group has two layers in sequence from the inside to the outside in the radial direction of the stator core 1.

[0046] Specifically, as Figure 1 - 11As shown, the main coil 21 is arranged circumferentially along the stator core 1 and forms four main coil layers 2. Each main coil layer 2 can be embedded into the corresponding coil slot group. One end of the main coil 21 in each main coil layer 2 is embedded into the outer layer of the corresponding coil slot group, and the other end of the main coil 21 in each main coil layer 2 is embedded into the inner layer of the corresponding coil slot group. The four main coil layers 2 are concentrated in 36 coil slots 1a. The stator core 1 is provided with a secondary coil layer for paralleling the main coil layers 2 and two sets of lead-out wires 6 for paralleling the main coil layers 2. The stator core 1 is also provided with two sets of lead-out wires 6. Each set of lead-out wires 6 has 12 lead-out wires 6, and each set of lead-out wires 6 is arranged in 12 consecutive coil slots 1a.

[0047] The main coil 21 is a flat coil, and the flat wire can effectively improve the stator slot fill factor, thereby improving the motor efficiency and power density.

[0048] The main coil 21 has two insertion segments 22 that can be inserted into the coil slots 1a and a connection segment 23 connected to the two insertion segments 22. The connection segment can be made into a triangle, trapezoid, W shape, wave shape, arch shape, etc.

[0049] The main coil layer 2 is divided into four layers. The coil slots along the radial direction of the stator core 1 are divided into eight layers in total. The coil slot groups are also divided into four layers, and each coil slot group has two layers. Therefore, every two layers form a coil slot group. At this time, each main coil layer 2 can be embedded into the corresponding coil slot group. For the first layer, both ends of the main coil 21 of this layer are respectively arranged in the first coil slot group, and one end of the main coil 21 is embedded into the first layer of the coil slot 1a, and the other end of the main coil 21 is embedded into the second layer of the coil slot 1a. For the second layer, both ends of the main coil 21 of this layer are respectively arranged in the second coil slot group, and one end of the main coil 21 is embedded into the third layer of the coil slot 1a, and the other end of the main coil 21 is embedded into the fourth layer of the coil slot 1a. For the third layer, both ends of the main coil 21 of this layer are respectively arranged in the third coil slot group, and one end of the main coil 21 is embedded into the fifth layer of the coil slot 1a, and the other end of the main coil 21 is embedded into the sixth layer of the coil slot 1a. For the fourth layer, both ends of the main coil 21 of this layer are respectively arranged in the fourth coil slot group, and one end of the main coil 21 is embedded into the seventh layer of the coil slot 1a, and the other end of the main coil 21 is embedded into the eighth layer of the coil slot 1a. Therefore, only one type of coil is adopted for the above-mentioned main coil layer 2, which makes the production of the main coil layer 2 convenient. And through the secondary coil layer and two sets of lead-out wires 6 to connect the four main coil layers in parallel, the four main coil layers 2 are concentrated in 36 coil slots. It can be obtained that both ends of each main coil 21 are arranged across 5 coil slots 1a, and 12 consecutive coil slot positions are reserved for each layer. By selecting two of these consecutive 12 coil slot positions for the lead-out wires 6 to pass through, the purpose of concentrating the lead-out wires 6 is achieved. By adopting the above wiring method, it can not only make the production of the main coil layer 2 convenient, but also enable the lead-out wires 6 to be concentrated, reducing the volume of the busbar connected to the lead-out wires 6. On the one hand, it reduces the difficulty of processing and manufacturing the busbar, and on the other hand, it reduces the volume of the motor, further improving the production efficiency of the flat wire stator of the vehicle-mounted permanent magnet synchronous motor.

[0050] As Figure 8 and Figure 10 shown, one set of lead-out wires 6 is arranged in the outermost layer of the 12 coil slots 1a, and the other set of lead-out wires 6 is arranged in the innermost layer of the 12 coil slots 1a.

[0051] As Figures 4 to 7 and Figure 9 shown, the secondary coil layer includes the secondary coil layer one 3. The secondary coil layer one 3 includes 12 secondary coils one 31 arranged at intervals along the circumferential direction of the stator core 1. One end of each secondary coil one 31 is inserted into the second layer of one of the coil slots 1a, and the other end of each secondary coil one 31 is inserted into the third layer of another coil slot 1a. Each secondary coil one 31 spans 5 coil slots 1a.

[0052] The secondary coil layer includes the third secondary coil layer 5. The third secondary coil layer 5 includes 12 third secondary coils 51 arranged at intervals along the circumferential direction of the stator core 1. One end of each third secondary coil 51 is inserted into the sixth layer of one of the coil slots 1a, and the other end of each first secondary coil 31 is inserted into the seventh layer of another coil slot 1a. Each third secondary coil 51 straddles 5 coil slots 1a.

[0053] The secondary coil layer includes the second secondary coil layer 4. The second secondary coil layer 4 includes 6 second secondary coils 41 and 6 fourth secondary coils 42. One end of each second secondary coil 41 is inserted into the fourth layer of one of the coil slots 1a, and the other end of each second secondary coil 41 is inserted into the fifth layer of another coil slot 1a. Each second secondary coil 41 straddles 4 coil slots 1a; each fourth secondary coil 42 straddles 6 coil slots 1a.

[0054] As Figures 4 - 10 shown, one set of lead wires 6, the first secondary coil layer 3, the second secondary coil layer 4, the third secondary coil layer 5, and the other set of lead wires 6 are arranged in sequence along the radial direction of the stator core 1.

[0055] As Figure 10 shown, the flat wire stator of the permanent magnet synchronous motor for this vehicle further includes a star point bus bar 9 and three three-phase bus bars 10. The star point bus bar 9 has 12 first connection terminals 91. The 12 first connection terminals 91 correspond to 12 of the lead wires 6 one by one, and each first connection terminal 91 is fixedly connected to the corresponding lead wire 6; each three-phase bus bar 10 has 4 second connection terminals 101. Every 4 second connection terminals 101 correspond to 4 of the remaining 12 lead wires 6 one by one, and each second connection terminal 101 is fixedly connected to the corresponding lead wire 6; the star point bus bar 9 is electrically connected to the three three-phase bus bars 10. Each three-phase bus bar 10 is connected with a lead-out phase wire 11, and a temperature sensor 12 is arranged on the star point bus bar 9.

[0056] The lead wire 6 located in the first layer, the star point bus bar 9, and the three three-phase bus bars 10 together connect the main coils 21 in the first layer in parallel. The first secondary coil layer 3, the star point bus bar 9, and the three three-phase bus bars 10 together connect the main coils 21 in the second and third layers in parallel. The second secondary coil layer 4, the star point bus bar 9, and the three three-phase bus bars 10 together connect the main coils 21 in the fourth and fifth layers in parallel. The third secondary coil layer 5, the star point bus bar 9, and the three three-phase bus bars 10 together connect the main coils 21 in the sixth and seventh layers in parallel. The lead wire 6 located in the eighth layer, the star point bus bar 9, and the three three-phase bus bars 10 together connect the main coils 21 in the eighth layer in parallel.

[0057] As Figure 7 and Figure 11As shown, the flat wire stator of the vehicle permanent magnet synchronous motor further includes an insulator 13 injection-molded integrally with the star point bus bar 9 and three three-phase bus bars 10.

[0058] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A flat wire stator for a permanent magnet synchronous motor for an automobile, comprising a stator core (1) and a main coil (21), wherein the stator core (1) has 12n coil slots (1a) circumferentially, where n is a positive integer, and each coil slot (1a) is sequentially divided into 4k layers in the radial direction of the stator core (1), where k is a positive integer, and each adjacent two layers form a coil slot group, characterized in that: The main coil (21) is radially arranged into k main coil layers (2) along the stator core (1), the k main coil layers (2) respectively corresponding to k coil slot groups, and one end of the main coil (21) is embedded in the outer layer of the coil slot group, and the other end is embedded in the inner layer of the coil slot group, the k main coil layers (2) are concentrated in 9n consecutive coil slots (1a), and the stator core (1) is provided with a secondary coil layer for connecting the main coil layers (2) in parallel and two groups of lead wires (6) for connecting the main coil layers (2) in parallel, each group of lead wires (6) having 3n lead wires, and each group of lead wires (6) is respectively arranged in another 3n coil slots (1a).

2. The flat wire stator of a permanent magnet synchronous motor for a vehicle according to claim 1, characterized in that: n is 4, there are 48 coil slots (1a), k is 2, and each coil slot (1a) is divided into 8 layers in the radial direction of the stator core (1).

3. The flat wire stator of a permanent magnet synchronous motor for a vehicle according to claim 2, characterized in that: One group of lead wires (6) is arranged at the outermost layer of the 12 coil slots (1a), and the other group of lead wires (6) is arranged at the innermost layer of the 12 coil slots (1a).

4. The flat wire stator of a permanent magnet synchronous motor for a vehicle according to claim 3, characterized in that: The secondary coil layer includes a secondary coil layer one (3), and the secondary coil layer one (3) includes 12 secondary coils one (31) arranged at intervals along the circumference of the stator core (1), one end of each secondary coil one (31) is inserted into the second layer of one coil slot (1a), and the other end of each secondary coil one (31) is inserted into the third layer of another coil slot (1a), and each secondary coil one (31) spans five coil slots (1a).

5. The flat wire stator of a permanent magnet synchronous motor for a vehicle according to claim 4, characterized in that: The secondary coil layer includes a secondary coil layer three (5), and the secondary coil layer three (5) includes 12 secondary coils three (51) arranged at intervals along the circumference of the stator core (1). One end of each secondary coil three (51) is inserted into the sixth layer of one coil slot (1a), and the other end of each secondary coil one (31) is inserted into the seventh layer of another coil slot (1a). Each secondary coil three (51) spans five coil slots (1a).

6. The flat wire stator of a permanent magnet synchronous motor for a vehicle according to claim 5, characterized in that: The secondary coil layer includes a secondary coil layer 2 (4), and the secondary coil layer 2 (4) includes 6 secondary coils 2 (41) and 6 secondary coils 4 (42). One end of each secondary coil 2 (41) is inserted into the 4th layer of one coil slot (1a), and the other end of each secondary coil 2 (41) is inserted into the 5th layer of another coil slot (1a). Each secondary coil 2 (41) spans 4 coil slots (1a).

7. The flat wire stator of a permanent magnet synchronous motor for a vehicle according to claim 6, characterized in that: One group of lead wires (6), the secondary coil layer one (3), the secondary coil layer two (4), the secondary coil layer three (5) and another group of lead wires (6) are sequentially arranged along the radial direction of the stator core (1) from outside to inside.

8. A flat wire stator for a permanent magnet synchronous motor for a vehicle according to claim 2, 3, 4, 5, 6 or 7, characterized in that: The flat wire stator of the vehicle permanent magnet synchronous motor further comprises a star point busbar (9) and three three-phase busbars (10), wherein the star point busbar (9) has 12 connection terminals (91), and the 12 connection terminals (91) correspond one-to-one to a group of lead wires (6) and are fixedly connected; each three-phase busbar (10) has four connection terminals (101), and the 12 connection terminals (101) correspond one-to-one to another group of lead wires (6) and are fixedly connected; the star point busbar (9) is electrically connected to the three three-phase busbars (10), and each three-phase busbar (10) is connected to a lead phase line (11).

9. The flat wire stator of a permanent magnet synchronous motor for a vehicle according to claim 8, characterized in that: A temperature sensor (12) is provided on the star point bus (9).

10. The flat wire stator of a permanent magnet synchronous motor for a vehicle according to claim 8, characterized in that: The flat wire stator of the vehicle permanent magnet synchronous motor further comprises an insulator (13) which is integrally molded with the star point busbar (9) and the three three-phase busbars (10) by injection molding.

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