Hairpin type flat wire stator winding, stator, motor and vehicle

Abstract

The invention relates to a hairpin type flat wire stator winding, a stator, a motor and a vehicle, and belongs to the technical field of automobiles. The hairpin type flat wire stator winding is suitable for being obtained by adopting a three-phase parallel flat wire and a hairpin to penetrate through an annular stator with seventy-two stator grooves in the inner side, each of the seventy-two stator grooves has n layers, the three phases are U phases, V phases and W phases, the annular stator comprises six adjacent poles surrounding, the U-phase winding comprises three branches connected in parallel, and the W-phase winding comprises three branches connected in parallel. Each branch is wound around the first layer of two stator slots in two adjacent poles and wound around the first layer of one stator slot in the other four poles, each pole wound around the first layer of two stator slots by one branch is different, each branch is wound around the nth layer of two stator slots in two adjacent poles, and each branch is wound around the nth layer of two stator slots in two adjacent poles. The other four poles are wound around the nth layer of one stator groove, and the poles, wound around the nth layers of the two stator grooves by one branch, of the two stator grooves are different. According to the invention, the winding mode of the hairpin type flat wire stator winding can be simplified, and the winding difficulty is reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of automotive technologies, and particularly to a hairpin-shaped flat wire stator winding, a stator, a motor, and a vehicle. Background Art

[0002] Compared with traditional round wire winding motors, flat wire winding motors have more excellent performance in terms of efficiency, power density, cost, integration, etc. However, in the existing winding method of flat wire stator windings, due to obvious skin effect and proximity effect at high speeds, the current distribution along the cross-section of the flat wire is uneven, there are differences in the resistance of each winding path, and the flowing current is unbalanced, resulting in an increase in AC impedance, a decrease in conversion efficiency at high speeds, and a weakening of continuous performance. At present, in order to achieve current balance in parallel branches for some stator windings, the winding method of the windings is very complex and the winding difficulty is high. Summary of the Invention

[0003] In view of this, the embodiments of the present disclosure provide a hairpin-shaped flat wire stator winding, a stator, a motor, and a vehicle, which can simplify the winding method of the hairpin-shaped flat wire stator winding and reduce the winding difficulty. The technical solutions are as follows:

[0004] In a first aspect, a hairpin-shaped flat wire stator winding is provided. The hairpin-shaped flat wire stator winding is adapted to be obtained by using three-phase parallel flat wires and hairpin threading through a ring-shaped stator with seventy-two stator slots inside. Each of the seventy-two stator slots has n layers. The three phases are the U phase, the V phase, and the W phase. The ring-shaped stator includes six adjacent poles arranged in sequence, and each pole has twelve of the stator slots;

[0005] The U-phase winding includes three parallel branches. The three branches are respectively formed by flat wires starting from the first starting point, the second starting point, and the third starting point located on the m-th layer and helically reciprocating layer by layer between the 1st layer and the n-th layer in cooperation with hairpins until reaching the first ending point, the second ending point, and the third ending point located on the m-th layer. The first starting point and the first ending point, the second starting point and the second ending point, and the third starting point and the third ending point are all circular loops; where n and m are both positive integers, and n≥2, m≤n;

[0006] Each branch winds through the 1st layer of two stator slots in two adjacent poles and winds through the 1st layer of one stator slot in the remaining four poles, and each pole that is wound through the 1st layer of two stator slots by one branch is different;

[0007] Each branch winds through the n-th layer of two stator slots in two adjacent poles and winds through the n-th layer of one stator slot in the remaining four poles, and each pole that is wound through the n-th layer of two stator slots by one branch is different;

[0008] The V-phase winding is obtained by rotating the U-phase winding by 8 stator slots in the first direction;

[0009] The W-phase winding is obtained by rotating the U-phase winding by 16 stator slots in the first direction.

[0010] In a possible implementation, m = 1 or m = n.

[0011] In a possible implementation, the first starting point, the second starting point, and the third starting point are respectively located at the m-th layer of three adjacent stator slots.

[0012] In a possible implementation, the first ending point, the second ending point, and the third ending point are respectively located at the m-th layer of three adjacent stator slots.

[0013] In a possible implementation, n = 8. Define xy as the y-th layer of the x-th stator slot, where x ∈ [1, 72] and y ∈ [a, h]. a is the 1st layer at the bottom of the stator slot, and h is the 8th layer at the top of the stator slot. The first branch of the U-phase winding is:

[0014] 13a ∩ 25b ∪ 37c ∩ 49d ∪ 61e ∩ 1f ∪ 13g ∩ 25h ∪

[0015] 38h ∩ 26g ∪ 14f ∩ 2e ∪ 62d ∩ 50c ∪ 38b ∩ 26a ∪

[0016] 16a ∩ 28b ∪ 40c ∩ 52d ∪ 64e ∩ 4f ∪ 16g ∩ 28h ∪

[0017] 39h ∩ 27g ∪ 15f ∩ 3e ∪ 63d ∩ 51c ∪ 39b ∩ 27a ∪

[0018] 38a ∩ 50b ∪ 62c ∩ 2d ∪ 14e ∩ 26f ∪ 38g ∩ 50h ∪

[0019] 63h ∩ 51g ∪ 39f ∩ 27e ∪ 15d ∩ 3c ∪ 63b ∩ 51a ∪

[0020] 64a ∩ 4b ∪ 16c ∩ 28d ∪ 40e ∩ 52f ∪ 64g ∩ 4h ∪

[0021] 15h ∩ 3g ∪ 63f ∩ 51e ∪ 39d ∩ 27c ∪ 15b ∩ 3a.

[0022] In a possible implementation, n = 8. Define xy as the y-th layer of the x-th stator slot, where x ∈ [1, 72] and y ∈ [a, h]. a is the 1st layer at the bottom of the stator slot, and h is the 8th layer at the top of the stator slot. The first branch of the U-phase winding is:

[0023] 13a ∩ 25b ∪ 37c ∩ 49d ∪ 60e ∩ 72f ∪ 12g ∩ 24h ∪

[0024] 37h ∩ 25g ∪ 13f ∩ 1e ∪ 62d ∩ 50c ∪ 38b ∩ 26a ∪

[0025] 16a ∩ 28b ∪ 40c ∩ 52d ∪ 63e ∩ 3f ∪ 15g ∩ 27h ∪

[0026] 38h ∩ 26g ∪ 14f ∩ 2e ∪ 63d ∩ 51c ∪ 39b ∩ 27a ∪

[0027] 38a ∩ 50b ∪ 62c ∩ 2d ∪ 13e ∩ 25f ∪ 37g ∩ 49h ∪

[0028] 62h ∩ 50g ∪ 38f ∩ 26e ∪ 15d ∩ 3c ∪ 63b ∩ 51a ∪

[0029] 64a ∩ 4b ∪ 16c ∩ 28d ∪ 39e ∩ 51f ∪ 63g ∩ 3h ∪

[0030] 14h ∩ 2g ∪ 62f ∩ 50e ∪ 39d ∩ 27c ∪ 15b ∩ 3a。

[0031] In a possible implementation, n = 8. Define xy as the y-th layer of the x-th stator slot, where x ∈ [1, 72] and y ∈ [a, h]. a is the 1st layer at the bottom of the stator slot, and h is the 8th layer at the top of the stator slot. The first branch of the U-phase winding is:

[0032] 13a ∩ 24b ∪ 37c ∩ 48d ∪ 61e ∩ 72f ∪ 13g ∩ 24h ∪

[0033] 37h ∩ 26g ∪ 13f ∩ 2e ∪ 61d ∩ 50c ∪ 37b ∩ 26a ∪

[0034] 16a ∩ 27b ∪ 40c ∩ 51d ∪ 64e ∩ 3f ∪ 16g ∩ 27h ∪

[0035] 38h ∩ 27g ∪ 14f ∩ 3e ∪ 62d ∩ 51c ∪ 38b ∩ 27a ∪

[0036] 38a ∩ 49b ∪ 62c ∩ 1d ∪ 14e ∩ 25f ∪ 38g ∩ 49h ∪

[0037] 62h ∩ 51g ∪ 38f ∩ 27e ∪ 14d ∩ 3c ∪ 62b ∩ 51a ∪

[0038] 64a ∩ 3b ∪ 16c ∩ 27d ∪ 40e ∩ 51f ∪ 64g ∩ 3h ∪

[0039] 14h ∩ 3g ∪ 62f ∩ 51e ∪ 38d ∩ 27c ∪ 14b ∩ 3a。

[0040] In a second aspect, a stator is provided. The stator includes an annular stator having n layers of 72 stator slots on the inner side and a hairpin-shaped flat wire stator winding as described in any one of the first aspects. Among them, the hairpin-shaped flat wire stator winding is obtained by using three-phase parallel flat wires in cooperation with the annular stator.

[0041] In a third aspect, a motor is provided. The motor includes a rotor and a stator as described in the second aspect, and the rotor is rotatable relative to the stator.

[0042] In a fourth aspect, a vehicle is provided. The vehicle includes a motor as described in the third aspect.

[0043] In the solution shown in the present disclosure, the three branches of the U-phase winding all wind through the first layer of two stator slots in two adjacent poles, and wind through the first layer of one stator slot in the remaining four poles. Moreover, each pole that is wound through the first layer of two stator slots by one branch is different. At the same time, each branch winds through the nth layer of two stator slots in two adjacent poles, and winds through the nth layer of one stator slot in the remaining four poles. And each pole that is wound through the nth layer of two stator slots by one branch is different, so that the winding modes of the three branches of the U-phase winding on the annular stator can be consistent. And the V-phase winding is obtained by rotating eight stator slots relative to the U-phase winding in a first direction, and the W-phase winding is obtained by rotating sixteen stator slots relative to the U-phase winding in the first direction. Therefore, the winding modes of the three branches of the U-phase winding, the three branches of the V-phase winding, and the three branches of the W-phase winding are all the same. Thus, the winding mode of the hairpin-shaped flat wire stator winding is simplified, and the winding difficulty is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0045] Figure 1 It is a schematic diagram of the distribution of stator slot conductors of a hairpin-shaped flat wire stator winding provided by an embodiment of the present disclosure;

[0046] Figure 2 It is a schematic diagram of the U-phase winding of the first hairpin-shaped flat wire stator winding provided by an embodiment of the present disclosure;

[0047] Figure 3 It is a schematic diagram of one branch of the U-phase winding of the first hairpin-shaped flat wire stator winding provided by an embodiment of the present disclosure;

[0048] Figure 4 It is a schematic diagram of the V-phase winding of the first hairpin-shaped flat wire stator winding provided by an embodiment of the present disclosure;

[0049] Figure 5 It is a schematic diagram of the W-phase winding of the first hairpin-shaped flat wire stator winding provided by an embodiment of the present disclosure;

[0050] Figure 6 It is a schematic diagram of the U-phase winding of the second hairpin-shaped flat wire stator winding provided by an embodiment of the present disclosure;

[0051] Figure 7 It is a schematic diagram of a branch of the U-phase winding of the second hairpin-shaped flat wire stator winding provided by an embodiment of the present disclosure;

[0052] Figure 8 It is a schematic diagram of the V-phase winding of the second hairpin-shaped flat wire stator winding provided by an embodiment of the present disclosure;

[0053] Figure 9 It is a schematic diagram of the W-phase winding of the second hairpin-shaped flat wire stator winding provided by an embodiment of the present disclosure;

[0054] Figure 10 It is a schematic diagram of the U-phase winding of the third hairpin-shaped flat wire stator winding provided by an embodiment of the present disclosure;

[0055] Figure 11 It is a schematic diagram of a branch of the U-phase winding of the third hairpin-shaped flat wire stator winding provided by an embodiment of the present disclosure;

[0056] Figure 12 It is a schematic diagram of the V-phase winding of the third hairpin-shaped flat wire stator winding provided by an embodiment of the present disclosure;

[0057] Figure 13 It is a schematic diagram of the W-phase winding of the third hairpin-shaped flat wire stator winding provided by an embodiment of the present disclosure. Detailed implementation manners

[0058] To make the objectives, technical solutions, and advantages of the present disclosure clearer, the following will further describe the embodiments of the present disclosure in detail with reference to the accompanying drawings.

[0059] In a first aspect, this embodiment relates to a hairpin-shaped flat wire stator winding. As Figure 1 shown is a schematic diagram of the distribution of conductors in the stator slots of the hairpin-shaped flat wire stator winding. The hairpin-shaped flat wire stator winding is suitable to be obtained by using three-phase parallel flat wires and threading hairpins through a ring-shaped stator with seventy-two stator slots inside. Each of the seventy-two stator slots has n layers, indicating that each stator slot has n layers of conductors. The three phases are the U phase, the V phase, and the W phase. The ring-shaped stator includes six adjacent poles surrounded in sequence, and each pole has twelve stator slots.

[0060] For example, six poles can be successively the first pole, the second pole, the third pole, the fourth pole, the fifth pole, and the sixth pole surrounding adjacent ones, and the first pole can have stator slots No. 1 to No. 12, the second pole can have stator slots No. 13 to No. 24, the third pole can have stator slots No. 25 to No. 36, the fourth pole can have stator slots No. 37 to No. 48, the fifth pole can have stator slots No. 49 to No. 60, and the sixth pole can have stator slots No. 61 to No. 72.

[0061] The U-phase winding includes three parallel branches. The three branches are respectively formed by flat wires starting from the first starting point, the second starting point, and the third starting point located on the m-th layer and spirally reciprocating layer by layer between the 1st layer and the n-th layer in cooperation with hairpins until reaching the first end point, the second end point, and the third end point located on the m-th layer to construct and form. The first starting point and the first end point, the second starting point and the second end point, and the third starting point and the third end point are all circular loops; where n and m are both positive integers, and n≥2, m≤n. For example, it can be n = 2, then it can be m = 1 or m = 2. Another example, it can be n = 5, then it can be m = 1, m = 2, m = 3, m = 4, or m = 5. Still another example, it can be n = 8, then it can be m = 1, m = 2, m = 3, m = 4, m = 5, m = 6, m = 7, or m = 8.

[0062] In the embodiments of the present disclosure, taking Figure 1 n = 8 shown as an example, define xy as the y-th layer of the x-th stator slot, where x ∈ [1, 72], y ∈ [a, h], 1 to 72 are the slot numbers of the stator slots, and a to h are the layer numbers of the 1st to 8th layers of the stator slot conductors. a is the 1st layer and is located at the bottom position of the stator slot, and h is the 8th layer and is located at the top position of the stator slot. For example, 13a represents the 1st layer of the 13th stator slot. And define as the i-th branch of the X-phase, j is the current flowing order, X can be taken as U, V, or W, i can be taken as 1, 2, or 3, and j can be taken as 1, 2, 3… or 64.

[0063] For example, in Figures 1 to 13 , refers to the current inflow points of the three branches of the U-phase and is also the lead-out end of the U-phase line, refers to the current outflow points of the three branches of the U-phase and is also the lead-out end of the neutral line. In addition, the lead-out line end and the neutral line end can be swapped, that is, can also be used as the lead-out end of the neutral line, can be used as the lead-out end of the U-phase line.

[0064] Meanwhile, in the embodiments of the present disclosure, and They can be connected into a loop from the layout positions, so the three branch leads of a single phase can be selected from any point on the loop. For example, the phase line lead of the first branch of the U phase can be The neutral line lead is the corresponding welding end The phase line leads and neutral line leads of the other two branches can also be arbitrarily selected in the same direction, and the starting numbers selected do not need to be the same. The winding methods of the other two phases can also refer to the U phase for the selection of the starting and ending points of the phase line leads and neutral lines.

[0065] Moreover, each branch winds through the first layer of two stator slots in two adjacent poles and winds through the first layer of one stator slot in the remaining four poles, and each pole through which a branch winds through the first layer of two stator slots is different.

[0066] Each branch winds through the nth layer of two stator slots in two adjacent poles and winds through the nth layer of one stator slot in the remaining four poles, and each pole through which a branch winds through the nth layer of two stator slots is different.

[0067] For example, in Figure 3 , the first branch of the U phase can wind through the first layer of two stator slots in the second pole, wind through the first layer of two stator slots in the third pole, and wind through the first layer of one stator slot in the remaining four poles. The second branch can wind through the first layer of two stator slots in the fourth pole, wind through the first layer of two stator slots in the fifth pole, and wind through the first layer of one stator slot in the remaining four poles. The third branch can wind through the first layer of two stator slots in the sixth pole, wind through the first layer of two stator slots in the first pole, and wind through the first layer of one stator slot in the remaining four poles.

[0068] However, the first branch of the U phase can also wind through the first layer of two stator slots in the first pole, wind through the first layer of two stator slots in the second pole, and wind through the first layer of one stator slot in the remaining four poles. The second branch can also wind through the first layer of two stator slots in the third pole, wind through the first layer of two stator slots in the fourth pole, and wind through the first layer of one stator slot in the remaining four poles. The third branch can also wind through the first layer of two stator slots in the fifth pole, wind through the first layer of two stator slots in the sixth pole, and wind through the first layer of one stator slot in the remaining four poles.

[0069] For example, referring to Figure 2 and Figure 3, the first branch of the U-phase can wind through the first layer of two stator slots in the third pole, the first layer of two stator slots in the fourth pole, and the first layer of one stator slot in the remaining four poles. The second branch can wind through the first layer of two stator slots in the fifth pole, the first layer of two stator slots in the sixth pole, and the first layer of one stator slot in the remaining four poles. The third branch can wind through the first layer of two stator slots in the first pole, the first layer of two stator slots in the second pole, and the first layer of one stator slot in the remaining four poles.

[0070] However, the first branch of the U-phase can also wind through the eighth layer of two stator slots in the first pole, the eighth layer of two stator slots in the second pole, and the eighth layer of one stator slot in the remaining four poles. The second branch can also wind through the eighth layer of two stator slots in the third pole, the eighth layer of two stator slots in the fourth pole, and the eighth layer of one stator slot in the remaining four poles. The third branch can also wind through the eighth layer of two stator slots in the fifth pole, the eighth layer of two stator slots in the sixth pole, and the eighth layer of one stator slot in the remaining four poles.

[0071] Moreover, the V-phase winding is obtained by rotating the U-phase winding eight stator slots in the first direction, and the W-phase winding is obtained by rotating the U-phase winding sixteen stator slots in the first direction.

[0072] As can be seen from the above, all three branches of the U-phase winding wind through the first layer of two stator slots in two adjacent poles, and the first layer of one stator slot in the remaining four poles, and each pole through which a branch winds through the first layer of two stator slots is different. At the same time, each branch winds through the nth layer of two stator slots in two adjacent poles, and the nth layer of one stator slot in the remaining four poles, and each pole through which a branch winds through the nth layer of two stator slots is different. This enables the winding methods of the three branches of the U-phase winding on the annular stator to be consistent. Also, the V-phase winding is obtained by rotating the U-phase winding eight stator slots in the first direction, and the W-phase winding is obtained by rotating the U-phase winding sixteen stator slots in the first direction. Therefore, the winding methods of the three branches of the U-phase winding, the three branches of the V-phase winding, and the three branches of the W-phase winding are all the same. Thus, the winding method of the hairpin-shaped flat wire stator winding is simplified, the winding difficulty is reduced, and at the same time, the material consumption of the flat wire is also reduced, saving costs. At the same time, it is also beneficial to improve the slot fill factor of the motor, can achieve current balance in each parallel branch, there is no circulating current problem, improves the efficiency and power factor of the motor, and reduces energy consumption.

[0073] In one example, m = 1 or m = n. For example, when m = 1, the current inflow points and current outflow points of the three branches of the U-phase winding, the three branches of the V-phase winding, and the three branches of the W-phase winding are all located in the first layer of the stator slots and are connected to the busbar at the bottom of the stator slots. Another example is when m = 8, the current inflow points and current outflow points of the three branches of the U-phase winding, the three branches of the V-phase winding, and the three branches of the W-phase winding are all located in the eighth layer of the stator slots and are connected to the busbar at the top of the stator slots. Thus, the phase lines and the neutral line can be concentrated in the first layer or the last layer of the hairpin-shaped flat wire stator winding, simplifying the design of the busbar and saving the material used for the busbar.

[0074] In one example, the first starting point, the second starting point, and the third starting point are respectively located in the m-th layer of three adjacent stator slots. For example Figure 2 As shown, the current inflow points of the three branches of the U-phase winding can be 13a, 14a, and 15a respectively. In this way, the current inflow point positions of the three branches of the U-phase winding, the three branches of the V-phase winding, and the three branches of the W-phase winding are close to each other. Thus, the design of the busbar can be further simplified and the material used for the busbar can be saved.

[0075] In one example, the first ending point, the second ending point, and the third ending point are respectively located in the m-th layer of three adjacent stator slots. For example Figure 2 As shown, the current inflow points of the three branches of the U-phase winding can be 1a, 2a, and 3a respectively. In this way, the current outflow point positions of the three branches of the U-phase winding, the three branches of the V-phase winding, and the three branches of the W-phase winding are close to each other. Thus, the design of the busbar can be further simplified and the material used for the busbar can be saved.

[0076] In one example, as Figure 2 shown is the schematic diagram of the U-phase winding of the first hairpin-shaped flat wire stator winding, Figure 3 shown is the schematic diagram of one branch of the U-phase winding of the first hairpin-shaped flat wire stator winding, Figure 4 shown is the schematic diagram of the V-phase winding of the first hairpin-shaped flat wire stator winding, Figure 5 shown is the schematic diagram of the W-phase winding of the first hairpin-shaped flat wire stator winding. The first branch of the U-phase winding can be:

[0077] 13a ∩ 25b ∪ 37c ∩ 49d ∪ 61e ∩ 1f ∪ 13g ∩ 25h ∪

[0078] 38h ∩ 26g ∪ 14f ∩ 2e ∪ 62d ∩ 50c ∪ 38b ∩ 26a ∪

[0079] 16a ∩ 28b ∪ 40c ∩ 52d ∪ 64e ∩ 4f ∪ 16g ∩ 28h ∪

[0080] 39h ∩ 27g ∪ 15f ∩ 3e ∪ 63d ∩ 51c ∪ 39b ∩ 27a ∪

[0081] 38a ∩ 50b ∪ 62c ∩ 2d ∪ 14e ∩ 26f ∪ 38g ∩ 50h ∪

[0082] 63h ∩ 51g ∪ 39f ∩ 27e ∪ 15d ∩ 3c ∪ 63b ∩ 51a ∪

[0083] 64a ∩ 4b ∪ 16c ∩ 28d ∪ 40e ∩ 52f ∪ 64g ∩ 4h ∪

[0084] 15h ∩ 3g ∪ 63f ∩ 51e ∪ 39d ∩ 27c ∪ 15b ∩ 3a, flowing in from 13a and flowing out from 3a.

[0085] In the above winding method, "∩" represents hairpin connection, "∪" represents welding, and "∩" and "∪" can be swapped. Specifically, as Figure 2 and Figure 3 shown, the current flows into the conductor of the first layer of the 13th stator slot, the conductor of the first layer of the 13th stator slot is connected to the conductor of the second layer of the 25th stator slot through an end U-shaped hairpin, the conductor of the second layer of the 25th stator slot is connected to the conductor of the third layer of the 37th stator slot through end welding, and so on, until it is connected to the conductor of the eighth layer of the 25th stator slot. The conductor of the eighth layer of the 25th stator slot is bridged to the conductor of the eighth layer of the 38th stator slot through end welding. Then, the conductor of the eighth layer of the 38th stator slot is connected to the conductor of the seventh layer of the 26th stator slot through an end U-shaped hairpin, the conductor of the seventh layer of the 26th stator slot is connected to the conductor of the sixth layer of the 14th stator slot through end welding, and so on, until it is connected to the conductor of the first layer of the 26th stator slot. The conductor of the first layer of the 26th stator slot is bridged to the conductor of the first layer of the 16th stator slot through end welding. Continue to wind back and forth like this until it is connected to the conductor of the first layer of the 3rd stator slot, and the current flows out.

[0086] According to the above winding method, the winding of the first branch of the U phase can be achieved. At the same time, continue to refer to Figure 2 shown, the current inflow point of the second branch of the U phase is 15a, and the current outflow point is 2a. The winding principle is the same as that of the first branch of the U phase. Those skilled in the art can perform corresponding operations adaptively and will not be elaborated here.

[0087] Similarly, continue to refer to Figure 2 shown, the current inflow point of the third branch of the U phase is 14a, and the current outflow point is 1a. The winding principle is also the same as that of the first branch of the U phase. Those skilled in the art can perform corresponding operations adaptively and will not be elaborated here.

[0088] The V-phase winding is obtained by rotating the U-phase winding by eight stator slots in the first direction. For example, the winding method of the V-phase winding can be obtained by rotating the U-phase winding by 8 slot positions along the direction of increasing stator slot numbers. As Figure 4 shown, the current of the first branch of the V-phase flows in from 21a and out from 11a. The current of the second branch of the V-phase flows in from 23a and out from 10a. The current of the third branch of the V-phase flows in from 22a and out from 9a. Those skilled in the art can perform operations according to the above corresponding winding, and the detailed connection route will not be elaborated.

[0089] The W-phase winding is obtained by rotating the U-phase winding by sixteen stator slots in the first direction. For example, the winding method of the W-phase winding can be obtained by rotating the U-phase winding by 16 slot positions along the direction of increasing stator slot numbers. As Figure 5 shown, the current of the first branch of the W-phase flows in from 29a and out from 19a. The current of the second branch of the W-phase flows in from 31a and out from 18a. The current of the third branch of the W-phase flows in from 30a and out from 17a. Those skilled in the art can perform operations according to the above corresponding winding, and the detailed connection route will not be elaborated.

[0090] In one example, as Figure 6 shown is the schematic diagram of the U-phase winding of the second hairpin-shaped flat wire stator winding, Figure 7 shown is the schematic diagram of a branch of the U-phase winding of the second hairpin-shaped flat wire stator winding, Figure 8 shown is the schematic diagram of the V-phase winding of the second hairpin-shaped flat wire stator winding, Figure 9 shown is the schematic diagram of the W-phase winding of the second hairpin-shaped flat wire stator winding. The first branch of the U-phase winding can be:

[0091] 13a ∩ 25b ∪ 37c ∩ 49d ∪ 60e ∩ 72f ∪ 12g ∩ 24h ∪

[0092] 37h ∩ 25g ∪ 13f ∩ 1e ∪ 62d ∩ 50c ∪ 38b ∩ 26a ∪

[0093] 16a ∩ 28b ∪ 40c ∩ 52d ∪ 63e ∩ 3f ∪ 15g ∩ 27h ∪

[0094] 38h ∩ 26g ∪ 14f ∩ 2e ∪ 63d ∩ 51c ∪ 39b ∩ 27a ∪

[0095] 38a ∩ 50b ∪ 62c ∩ 2d ∪ 13e ∩ 25f ∪ 37g ∩ 49h ∪

[0096] 62h ∩ 50g ∪ 38f ∩ 26e ∪ 15d ∩ 3c ∪ 63b ∩ 51a ∪

[0097] 64a ∩ 4b ∪ 16c ∩ 28d ∪ 39e ∩ 51f ∪ 63g ∩ 3h ∪

[0098] 14h ∩ 3g ∪ 62f ∩ 51e ∪ 38d ∩ 27c ∪ 14b ∩ 3a, flowing in from 13a and flowing out from 3a.

[0099] In the above winding method, "∩" represents hairpin connection, "∪" represents welding, and "∩" and "∪" can be swapped. Specifically, as Figure 6 and Figure 7 shown, the current flows in from the conductor of the first layer in the 13th stator slot, the conductor of the first layer in the 13th stator slot is connected to the conductor of the second layer in the 25th stator slot through an end U-shaped hairpin, the conductor of the second layer in the 25th stator slot is connected to the conductor of the third layer in the 37th stator slot through end welding, and so on until it is connected to the conductor of the eighth layer in the 24th stator slot. The conductor of the eighth layer in the 24th stator slot is bridged to the conductor of the eighth layer in the 37th stator slot through end welding. Then, the conductor of the eighth layer in the 37th stator slot is connected to the conductor of the seventh layer in the 25th stator slot through an end U-shaped hairpin, the conductor of the seventh layer in the 25th stator slot is connected to the conductor of the sixth layer in the 13th stator slot through end welding, and so on until it is connected to the conductor of the first layer in the 26th stator slot. The conductor of the first layer in the 26th stator slot is bridged to the conductor of the first layer in the 16th stator slot through end welding. Continuing to wind back and forth like this until it is connected to the conductor of the first layer in the 3rd stator slot, the current flows out.

[0100] According to the above winding method, the winding of the first branch of the U phase can be realized. At the same time, continuing to refer to Figure 6 shown, the current inflow point of the second branch of the U phase is 15a, and the current outflow point is 2a. The winding principle is the same as that of the first branch of the U phase. Those skilled in the art can perform corresponding operations adaptively and will not be elaborated here.

[0101] Similarly, continuing to refer to Figure 6 shown, the current inflow point of the third branch of the U phase is 14a, and the current outflow point is 1a. The winding principle is also the same as that of the first branch of the U phase. Those skilled in the art can perform corresponding operations adaptively and will not be elaborated here.

[0102] The V-phase winding is obtained by rotating the U-phase winding eight stator slots in the first direction. For example, the winding method of the V-phase winding can be obtained by rotating the U-phase winding 8 slot positions in the direction of increasing stator slot numbers. Referring to Figure 8 shown, the current of the first branch of the V phase flows in from 21a and flows out from 11a. The current of the second branch of the V phase flows in from 23a and flows out from 10a. The current of the third branch of the V phase flows in from 22a and flows out from 9a. Those skilled in the art can perform operations according to the above content for corresponding winding. The detailed connection route will not be elaborated.

[0103] The W-phase winding is obtained by rotating the U-phase winding by sixteen stator slots in the first direction. For example, the winding method of the W-phase winding can be obtained by rotating the U-phase winding by 16 slot positions in the direction of increasing stator slot numbers. Refer to Figure 9 As shown, the current of the first branch of the W-phase flows in from 29a and out from 19a. The current of the second branch of the W-phase flows in from 31a and out from 18a. The current of the third branch of the W-phase flows in from 30a and out from 17a. Those skilled in the art can perform operations corresponding to the above winding, and the detailed connection route will not be elaborated.

[0104] In one example, as Figure 10 shown is a schematic diagram of the U-phase winding of the third hairpin-shaped flat wire stator winding, Figure 11 shown is a schematic diagram of a branch of the U-phase winding of the third hairpin-shaped flat wire stator winding, Figure 12 shown is a schematic diagram of the V-phase winding of the third hairpin-shaped flat wire stator winding, Figure 13 shown is a schematic diagram of the W-phase winding of the third hairpin-shaped flat wire stator winding. The first branch of the U-phase winding can be:

[0105] 13a ∩ 24b ∪ 37c ∩ 48d ∪ 61e ∩ 72f ∪ 13g ∩ 24h ∪

[0106] 37h ∩ 26g ∪ 13f ∩ 2e ∪ 61d ∩ 50c ∪ 37b ∩ 26a ∪

[0107] 16a ∩ 27b ∪ 40c ∩ 51d ∪ 64e ∩ 3f ∪ 16g ∩ 27h ∪

[0108] 38h ∩ 27g ∪ 14f ∩ 3e ∪ 62d ∩ 51c ∪ 38b ∩ 27a ∪

[0109] 38a ∩ 49b ∪ 62c ∩ 1d ∪ 14e ∩ 25f ∪ 38g ∩ 49h ∪

[0110] 62h ∩ 51g ∪ 38f ∩ 27e ∪ 14d ∩ 3c ∪ 62b ∩ 51a ∪

[0111] 64a ∩ 3b ∪ 16c ∩ 27d ∪ 40e ∩ 51f ∪ 64g ∩ 3h ∪

[0112] 14h ∩ 3g ∪ 62f ∩ 51e ∪ 38d ∩ 27c ∪ 14b ∩ 3a.

[0113] In the above winding method, "∩" represents hairpin connection, "∪" represents welding, and "∩" and "∪" can be swapped. Specifically, as Figure 10 and Figure 11As shown, the current flows into the conductor of the first layer in the 13th stator slot. The conductor of the first layer in the 13th stator slot is connected to the conductor of the second layer in the 24th stator slot through an end U-shaped hairpin. The conductor of the second layer in the 24th stator slot is connected to the conductor of the third layer in the 37th stator slot through end welding, and so on, until it is connected to the conductor of the eighth layer in the 24th stator slot. The conductor of the eighth layer in the 24th stator slot is bridged to the conductor of the eighth layer in the 37th stator slot through end welding. Then, the conductor of the eighth layer in the 37th stator slot is connected to the conductor of the seventh layer in the 26th stator slot through an end U-shaped hairpin. The conductor of the seventh layer in the 26th stator slot is connected to the conductor of the sixth layer in the 13th stator slot through end welding, and so on, until it is connected to the conductor of the first layer in the 26th stator slot. The conductor of the first layer in the 26th stator slot is bridged to the conductor of the first layer in the 16th stator slot through end welding. This continues to wind back and forth until it is connected to the conductor of the first layer in the 3rd stator slot, and the current flows out.

[0114] According to the above winding method, the winding of the first branch of the U phase can be realized. At the same time, continue to refer to Figure 10 As shown, the current inflow point of the second branch of the U phase is 15a, and the current outflow point is 2a. Its winding principle is the same as that of the first branch of the U phase. Those skilled in the art can perform corresponding operations adaptively and will not be elaborated here.

[0115] Similarly, continue to refer to Figure 10 As shown, the current inflow point of the third branch of the U phase is 14a, and the current outflow point is 1a. Its winding principle is also the same as that of the first branch of the U phase. Those skilled in the art can perform corresponding operations adaptively and will not be elaborated here.

[0116] The V-phase winding is obtained by rotating the U-phase winding eight stator slots along the first direction. For example, the winding method of the V-phase winding can be obtained by rotating the U-phase winding 8 slot positions along the direction of increasing stator slot numbers. As Figure 12 shown, the current of the first branch of the V phase flows in from 21a and flows out from 11a. The current of the second branch of the V phase flows in from 23a and flows out from 10a. The current of the third branch of the V phase flows in from 22a and flows out from 9a. Those skilled in the art can perform corresponding winding operations according to the above content, and the detailed connection route will not be elaborated.

[0117] The W-phase winding is obtained by rotating the U-phase winding sixteen stator slots along the first direction. For example, the winding method of the W-phase winding can be obtained by rotating the U-phase winding 16 slot positions along the direction of increasing stator slot numbers. As Figure 13 shown, the current of the first branch of the W phase flows in from 29a and flows out from 19a. The current of the second branch of the W phase flows in from 30a and flows out from 17a. The current of the third branch of the W phase flows in from 31a and flows out from 18a. Those skilled in the art can perform corresponding winding operations according to the above content, and the detailed connection route will not be elaborated.

[0118] In the above example, an 8-layer hairpin-shaped flat wire stator winding is adopted. However, in the specific implementation process, the winding of 2, 3, 4, 5, 6, 7, 9, 10 and other layer hairpin-shaped flat wire stator windings can be realized by deleting or adding the number of layers of cross-wires between different layers. It can also be wound by shifting a certain number of slots left or right for several layers of windings. Therefore, the winding method adopted in this disclosure and the coils adapted to this winding method are not limited to the winding of the hairpin-shaped flat wire stator winding in the example.

[0119] In the embodiment of the present disclosure, the three branches of the U-phase winding all wind through the first layer of two stator slots in two adjacent poles, and wind through the first layer of one stator slot in the remaining four poles, and each pole that is wound through the first layer of two stator slots by one branch is different. At the same time, each branch winds through the nth layer of two stator slots in two adjacent poles, and winds through the nth layer of one stator slot in the remaining four poles, and each pole that is wound through the nth layer of two stator slots by one branch is different. This enables the winding methods of the three branches of the U-phase winding on the annular stator to be consistent. Moreover, the V-phase winding is obtained by rotating the U-phase winding by eight stator slots in the first direction, and the W-phase winding is obtained by rotating the U-phase winding by sixteen stator slots in the first direction. Therefore, the winding methods of the three branches of the U-phase winding, the three branches of the V-phase winding, and the three branches of the W-phase winding are all the same. Thus, the winding method of the hairpin-shaped flat wire stator winding is simplified, the winding difficulty is reduced, and at the same time, the material consumption of the flat wire is reduced, saving costs. At the same time, it is also beneficial to improve the slot filling rate of the motor, can achieve the balance of the currents of each parallel branch, there is no circulating current problem, improves the efficiency and power factor of the motor, and reduces energy consumption.

[0120] This embodiment also provides a stator, which includes an annular stator with n layers and 72 stator slots on the inner side and a hairpin-shaped flat wire stator winding according to any one of the first aspects. Among them, the hairpin-shaped flat wire stator winding is obtained by combining three-phase parallel flat wires with the annular stator.

[0121] In the embodiment of the present disclosure, the three branches of the U-phase winding all wind through the first layer of two stator slots in two adjacent poles, and wind through the first layer of one stator slot in the remaining four poles, and each pole that is wound through the first layer of two stator slots by one branch is different. At the same time, each branch winds through the nth layer of two stator slots in two adjacent poles, and winds through the nth layer of one stator slot in the remaining four poles, and each pole that is wound through the nth layer of two stator slots by one branch is different. This enables the winding methods of the three branches of the U-phase winding on the annular stator to be consistent. Moreover, the V-phase winding is obtained by rotating the U-phase winding by eight stator slots in the first direction, and the W-phase winding is obtained by rotating the U-phase winding by sixteen stator slots in the first direction. Therefore, the winding methods of the three branches of the U-phase winding, the three branches of the V-phase winding, and the three branches of the W-phase winding are all the same. Thus, the winding method of the hairpin-shaped flat wire stator winding is simplified, the winding difficulty is reduced, and at the same time, the material consumption of the flat wire is also reduced, saving costs. At the same time, it is also beneficial to improve the slot filling factor of the motor, can achieve current balance in each parallel branch, there is no circulating current problem, improves the efficiency and power factor of the motor, and reduces energy consumption.

[0122] In a third aspect, the present embodiment further provides a motor, which includes a rotor and a stator as in the second aspect, and the rotor is rotatable relative to the stator.

[0123] In the embodiment of the present disclosure, the three branches of the U-phase winding all wind through the first layer of two stator slots in two adjacent poles, and wind through the first layer of one stator slot in the remaining four poles, and each pole that is wound through the first layer of two stator slots by one branch is different. At the same time, each branch winds through the nth layer of two stator slots in two adjacent poles, and winds through the nth layer of one stator slot in the remaining four poles, and each pole that is wound through the nth layer of two stator slots by one branch is different. This enables the winding methods of the three branches of the U-phase winding on the annular stator to be consistent. Moreover, the V-phase winding is obtained by rotating the U-phase winding by eight stator slots in the first direction, and the W-phase winding is obtained by rotating the U-phase winding by sixteen stator slots in the first direction. Therefore, the winding methods of the three branches of the U-phase winding, the three branches of the V-phase winding, and the three branches of the W-phase winding are all the same. Thus, the winding method of the hairpin-shaped flat wire stator winding is simplified, the winding difficulty is reduced, and at the same time, the material consumption of the flat wire is also reduced, saving costs. At the same time, it is also beneficial to improve the slot filling factor of the motor, can achieve current balance in each parallel branch, there is no circulating current problem, improves the efficiency and power factor of the motor, and reduces energy consumption.

[0124] In a fourth aspect, the present embodiment further provides a vehicle, which includes a motor as in the third aspect.

[0125] In the embodiments of the present disclosure, the three branches of the U-phase winding all wind through the first layer of two stator slots in two adjacent poles, and wind through the first layer of one stator slot in the remaining four poles, and each pole that is wound through the first layer of two stator slots by one branch is different. At the same time, each branch winds through the nth layer of two stator slots in two adjacent poles, and winds through the nth layer of one stator slot in the remaining four poles, and each pole that is wound through the nth layer of two stator slots by one branch is different. This enables the winding methods of the three branches of the U-phase winding on the annular stator to be consistent. Moreover, the V-phase winding is obtained by rotating eight stator slots relative to the U-phase winding in the first direction, and the W-phase winding is obtained by rotating sixteen stator slots relative to the U-phase winding in the first direction. Therefore, the winding methods of the three branches of the U-phase winding, the three branches of the V-phase winding, and the three branches of the W-phase winding are all the same. Thus, the winding method of the hairpin-shaped flat wire stator winding is simplified, the winding difficulty is reduced, and at the same time, the material consumption of the flat wire is also reduced, saving costs. At the same time, it is also beneficial to improve the slot filling factor of the motor, can achieve the balance of the currents of each parallel branch, there is no circulating current problem, improves the efficiency and power factor of the motor, and reduces energy consumption.

[0126] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present disclosure can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type, and do not limit the number of objects. For example, the first object can be one or multiple. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the associated objects before and after.

[0127] The above are only the preferred embodiments of the present disclosure, and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A hairpin flat wire stator winding, characterized in that: The hairpin-type flat wire stator winding is suitable for being obtained by using three-phase parallel flat wires with hairpins to pass through an annular stator having seventy-two stator slots on the inner side, the seventy-two stator slots each having n layers, the three phases being U phase, V phase and W phase, the annular stator including six adjacent poles in sequence, each pole having twelve stator slots; The U-phase winding includes three branches connected in parallel, and the three branches are respectively formed by a flat wire starting from the first starting point, the second starting point and the third starting point located at the mth layer and cooperating with a hairpin to spirally reciprocate layer by layer between the 1st layer and the nth layer, until winding to the first end point, the second end point and the third end point located at the mth layer, and the first starting point and the first end point, the second starting point and the second end point, and the third starting point and the third end point are all ring loops; wherein n and m are both positive integers, and n≥2, m≤n; Each of the branches is wound around the first layers of two stator slots in two adjacent poles, and is wound around the first layer of one stator slot in the remaining four poles, and each pole having two stator slots in the first layer wound around by a branch is different; Each of the branches winds around the nth layers of two stator slots in two adjacent poles, and winds around the nth layer of one stator slot in the remaining four poles, and each pole whose two stator slots are wound around by one branch are different; The V-phase winding is obtained by rotating 8 stator slots relative to the U-phase winding in a first direction; The W-phase winding is obtained by rotating 16 stator slots relative to the U-phase winding in a first direction.

2. The hairpin flat wire stator winding according to claim 1, characterized in that: The m=1 or the m=n.

3. The hairpin flat wire stator winding according to claim 1, characterized in that: The first starting point, the second starting point and the third starting point are respectively located at the mth layer of three adjacent stator slots.

4. The hairpin flat wire stator winding according to claim 1, characterized in that: The first end point, the second end point and the third end point are respectively located at the mth layer of three adjacent stator slots.

5. The hairpin flat wire stator winding according to claim 1, characterized in that: n=8, define xy as the yth layer of the xth stator slot, where x∈[1,72], y∈[a,h], a is the 1st layer, located at the bottom of the stator slot, h is the 8th layer, located at the top of the stator slot, and the first branch of the U-phase winding is: 13a∩25b∪37c∩49d∪61e∩1f∪13g∩25h∪ 38h∩26g∪14f∩2e∪62d∩50c∪38b∩26a∪ 16a∩28b∪40c∩52d∪64e∩4f∪16g∩28h∪ 39h∩27g∪15f∩3e∪63d∩51c∪39b∩27a∪ 38a∩50b∪62c∩2d∪14e∩26f∪38g∩50h∪ 63h∩51g∪39f∩27e∪15d∩3c∪63b∩51a∪ 64a∩4b∪16c∩28d∪40e∩52f∪64g∩4h∪ 15h∩3g∪63f∩51e∪39d∩27c∪15b∩3a.

6. The hairpin flat wire stator winding according to claim 1, characterized in that: n=8, define xy as the yth layer of the xth stator slot, where x∈[1,72], y∈[a,h], a is the 1st layer, located at the bottom of the stator slot, h is the 8th layer, located at the top of the stator slot, and the first branch of the U-phase winding is: 13a∩25b∪37c∩49d∪60e∩72f∪12g∩24h∪ 37h∩25g∪13f∩1e∪62d∩50c∪38b∩26a∪ 16a∩28b∪40c∩52d∪63e∩3f∪15g∩27h∪ 38h∩26g∪14f∩2e∪63d∩51c∪39b∩27a∪ 38a∩50b∪62c∩2d∪13e∩25f∪37g∩49h∪ 62h∩50g∪38f∩26e∪15d∩3c∪63b∩51a∪ 64a∩4b∪16c∩28d∪39e∩51f∪63g∩3h∪ 14h∩3g∪62f∩51e∪38d∩27c∪14b∩3a.

7. The hairpin flat wire stator winding according to claim 1, characterized in that: n=8, define xy as the yth layer of the xth stator slot, where x∈[1,72], y∈[a,h], a is the 1st layer, located at the bottom of the stator slot, h is the 8th layer, located at the top of the stator slot, and the first branch of the U-phase winding is: 13a∩24b∪37c∩48d∪61e∩72f∪13g∩24h∪ 37h∩26g∪13f∩2e∪61d∩50c∪37b∩26a∪ 16a∩27b∪40c∩51d∪64e∩3f∪16g∩27h∪ 38h∩27g∪14f∩3e∪62d∩51c∪38b∩27a∪ 38a∩49b∪62c∩1d∪14e∩25f∪38g∩49h∪ 62h∩51g∪38f∩27e∪14d∩3c∪62b∩51a∪ 64a∩3b∪16c∩27d∪40e∩51f∪64g∩3h∪ 14h∩3g∪62f∩51e∪38d∩27c∪14b∩3a.

8. A stator, characterized in that: The stator comprises an annular stator having n layers of 72 stator slots on the inner side and a hairpin-type flat wire stator winding as claimed in any one of claims 1 to 7, wherein the hairpin-type flat wire stator winding is obtained by combining three-phase parallel flat wires with the annular stator.

9. A motor, characterized in that: The motor includes a rotor and the stator according to claim 8, wherein the rotor is rotatable relative to the stator.

10. A vehicle, characterized in that: The vehicle comprises the electric machine as claimed in claim 9.

Images