Stator of flat wire motor

Abstract

Provided in the present application is a stator of a flat wire motor. A flat wire winding has three-phase windings, the flat wire winding of each phase comprising two branches; each branch comprises a plurality of sub-conductors, the sub-conductors comprising two I-shaped sub-conductors and a plurality of U-shaped sub-conductors, and the two I-shaped sub-conductors being respectively located at a wire inlet end and a wire outlet end of each branch; the number of layers formed by the flat wire windings inside winding slots is M; the number of winding slots per pole per phase in a flat wire motor is 2; in the first layer, two legs of each U-shaped sub-conductor are located on a same layer, the spans of two U-shaped sub-conductors per pole per phase are respectively 5 and 7, and the spans of the U-shaped sub-conductors which are inserted into the other layers are 6; in the second layer to (M-1)th layer, two legs of each U-shaped sub-conductors are respectively located on two adjacent layers; and when M is an odd number, the other leg of a U-shaped sub-conductor having one leg inserted into the Mth layer is located on the (M-1)th layer, and when M is an even number, the other leg of the U-shaped sub-conductor having one leg inserted into the Mth layer is also located on the Mth layer.

Description

Stator of flat wire motor

[0001] Citation of Related Applications

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on August 31, 2023, with application number 202322361981.X and invention name “Stator for flat wire motor”, the Chinese patent application filed with the China Patent Office on April 11, 2024, with application number 202420750190.8 and invention name “Stator for flat wire motor and flat wire motor”, the Chinese patent application filed with the China Patent Office on May 15, 2024, with application number 202421062391.5 and invention name “Stator for flat wire motor”, and the Chinese patent application filed with the China Patent Office on June 12, 2024, with application number 202421325913.6 and invention name “Stator for flat wire motor”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of motors, and in particular to a stator of a flat wire motor using flat wires as windings. Background Art

[0004] Taking the motor of new energy vehicles as an example, the motor stator using flat wire as winding has a higher copper full rate, which can improve the power density of the motor.

[0005] There are various winding methods for flat wire windings. For example, for stator windings with 8 poles and 48 slots or 12 poles and 72 slots, the arrangement method in the prior art has a complex winding structure and poor versatility.

[0006] Summary of the Invention

[0007] In order to solve the above problems, the present application proposes a stator for a flat wire motor.

[0008] The stator of the flat wire motor provided in the present application includes an iron core and a flat wire winding. The flat wire winding has a three-phase winding. The flat wire winding of each phase includes two branches. Each branch includes multiple sub-conductors. The sub-conductors include two I-shaped sub-conductors and multiple U-shaped sub-conductors. The two legs of the U-shaped sub-conductor are connected at one end to form a crown end and separated at the other end to form a welding end. The two I-shaped sub-conductors are respectively located at the input end and the output end of each branch.

[0009] The number of layers of the flat wire winding formed in the winding slot is M, M is not less than 4, and the number of winding slots per pole and per phase of the flat wire motor is 2.

[0010] The incoming and outgoing terminals of the two branches are both located on the first layer. Within the first layer, the two legs of the U-shaped sub-conductor are located on the same layer. The spans of the two U-shaped sub-conductors per pole and per phase are 5 and 7 respectively. The spans of the U-shaped sub-conductors inserted into the remaining layers are all 6.

[0011] In the 2nd to M-1th layers, the two legs of the U-shaped sub-conductor are located in two adjacent layers respectively.

[0012] When M is an odd number, one leg of the U-shaped sub-conductor is inserted into the Mth layer and the other leg is located in the M-1th layer.

[0013] In the case where M is an even number, one leg of the U-shaped sub-conductor is inserted into the Mth layer and the other leg is also located in the Mth layer.

[0014] In at least one embodiment, when M is an odd number, the sub-conductors occupy two consecutive winding slots in each pole and each phase.

[0015] In at least one embodiment, when M is an even number, in each pole and each phase, the sub-conductor occupies two consecutive winding slots or the sub-conductor extends into three consecutive winding slots.

[0016] In at least one embodiment, adjacent legs of two adjacent U-shaped sub-conductors welded together form a welded pair, and each welded pair has a span of 6.

[0017] In at least one embodiment, when M is an even number, in each pole and each phase, the slots into which the legs of the sub-conductors are inserted are the 6*N+K slot, the 6*N+K-1 slot, and the 6*N+K+1 slot, wherein the 6*N+K slot is occupied as a whole, the 6*N+K-1 slot and the 6*N+K+1 slot occupy the radially outer half and the radially inner half, respectively, or the 6*N+K-1 slot and the 6*N+K+1 slot occupy the radially inner half and the radially outer half, respectively, N is a natural number, and K is selected from any integer from 2 to 5.

[0018] In at least one embodiment, adjacent legs of two adjacent U-shaped sub-conductors welded together form a welded pair, the welded pairs whose legs are located at the M / 2th layer and the M / 2+1th layer respectively have a span of 7, and the spans of the remaining welded pairs are 6.

[0019] In at least one embodiment, the routing of each branch extends toward adjacent poles in the same circumferential direction and toward adjacent layers in the same radial direction until encountering the first layer or the Mth layer. When there are no free slots to be filled in the original extension direction, the direction of circumferential extension and radial extension is changed.

[0020] In at least one embodiment, the first layer is the radially innermost layer and the Mth layer is the radially outermost layer, or

[0021] The first layer is the radially outermost layer, and the Mth layer is the radially innermost layer.

[0022] In at least one embodiment, the two branches of each phase are connected into one branch, and the incoming and outgoing terminals of the branch are located at two adjacent poles.

[0023] In at least one embodiment, the span of the U-shaped sub-conductors in the radially innermost layer and the radially outermost layer is 6, 5, or 7, wherein:

[0024] The situation where the span of the radially innermost and radially outermost U-shaped sub-conductors is 5 or 7 only occurs at one place in the entire branch, which is located at the two poles where the U-shaped sub-conductors connect the incoming and outgoing terminals.

[0025] The winding method of the stator of the flat wire motor according to the present application can be applied to winding slots of various layers, the winding method is simple, and the size of the end winding is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG. 1 is a schematic diagram of a stator of a flat wire motor according to a first embodiment of the present application.

[0027] FIG2 is a schematic diagram of the wiring sequence of one phase winding of the stator of the flat wire motor according to the first embodiment of the present application.

[0028] FIG. 3 is a schematic diagram showing the branch path of FIG. 2 .

[0029] FIG4 is a schematic diagram of the wiring sequence of the branch circuits of one phase winding of the stator of the flat wire motor according to the second embodiment of the present application.

[0030] FIG5 is a schematic diagram of the wiring sequence of the branch lines of one phase winding of the stator of the flat wire motor according to the third embodiment of the present application.

[0031] FIG6 is a schematic diagram of the wiring sequence of the branch lines of one phase winding of the stator of the flat wire motor according to the fourth embodiment of the present application.

[0032] FIG7 is a schematic diagram of the wiring sequence of one phase winding of the stator of the flat wire motor according to the fifth embodiment of the present application, with the crown end and the welding end shown separately.

[0033] FIG8 is a schematic diagram of the wiring sequence of one phase winding of the stator of the flat wire motor according to the sixth embodiment of the present application, with the crown end and the welding end shown separately.

[0034] FIG9 is a schematic diagram of a wiring sequence of a single branch of one phase winding of a stator of a flat wire motor according to a seventh embodiment of the present application.

[0035] FIG10 is a schematic diagram illustrating a wiring sequence of one phase winding of a stator of a flat wire motor according to an eighth embodiment of the present application.

[0036] FIG. 11 is a schematic diagram showing the branch path of FIG. 10 .

[0037] FIG12 is a schematic diagram illustrating the wiring sequence of branch lines of one phase winding of a stator of a flat wire motor according to a ninth embodiment of the present application.

[0038] FIG13 is a schematic diagram illustrating a wiring sequence of one phase winding of a stator of a flat wire motor according to a tenth embodiment of the present application.

[0039] FIG14 is a schematic diagram of the wiring sequence of a single branch of one phase winding of a stator of a flat wire motor according to the eleventh embodiment of the present application.

[0040] Explanation of reference numerals: S iron core; W winding; Bb busbar. DETAILED DESCRIPTION

[0041] The present application is described in detail below with reference to embodiments, but the present application is not limited to these embodiments.

[0042] First embodiment

[0043] Referring to Figures 1 to 3 , the stator of a flat wire motor according to a first embodiment of the present application (hereinafter referred to as the stator) includes an iron core S, windings W, and a busbar Bb. The windings W are inserted into winding slots (hereinafter referred to as slots) of the iron core S. The busbar Bb is used to connect the three-phase windings together, forming a star point connection or a delta connection.

[0044] The winding W includes three phases, the number of poles of the winding is 8, the number of winding slots of the iron core S is 48, the number of winding slots per pole and per phase is 2, and the winding of each phase includes 2 branches.

[0045] Each branch includes multiple sub-conductors, specifically, the sub-conductors of each branch include two I-shaped sub-conductors and multiple U-shaped sub-conductors. The two legs of the U-shaped sub-conductor are connected at one end to form a crown end and separated at the other end to form a welding end. The two I-shaped sub-conductors are respectively located at the input and output ends of each branch. The output and input ends are located at two adjacent poles, and those skilled in the art can deduce that the output and input ends of the remaining two phases can also be located in the slots corresponding to the two adjacent poles. This allows the copper bars and busbars Bb used at the winding ends of the stator to have very small dimensions in the circumferential direction.

[0046] 2 , the windings in this embodiment form six layers in the slots. FIG2 shows the winding routing sequence of one phase (eg, phase U). It should be understood that the windings of the other two phases can be obtained by shifting phase U.

[0047] Each column in the diagram represents a winding slot; winding slots that are not inserted into the phase are omitted. Each row in the diagram represents a layer within a slot. It should be understood that the layer mentioned here is an abstract concept. A layer only exists when a wire is inserted; if no wire is inserted into the slot, the layer structure does not exist. Depending on the actual design structure of the motor, the first layer can be the radially innermost layer or the radially outermost layer. The numbers in the spaces with different shaded backgrounds in the diagram represent the routing order of the windings of the first and second branches, respectively.

[0048] The numeral 1 represents the incoming wire end of the branch winding, with the letters A and B representing the incoming wire ends of the first and second branches, respectively. The numeral 48 represents the outgoing wire end of the branch winding, with the letters a and b representing the outgoing wire ends of the first and second branches, respectively. The solid lines in the figures represent the crown ends of the conductors, and the dotted lines represent the soldered ends of the conductors.

[0049] For a single-phase winding, at each pole, the winding is inserted into two adjacent full slots. For example, for a pole with slots 1 to 8, the U-phase winding is inserted into two adjacent slots, slot 3 and slot 4, with both slots 3 and 4 being occupied by the U-phase winding.

[0050] There are three types of U-shaped sub-conductors:

[0051] The first type of U-shaped sub-conductors are single-layer conductors, with both legs located in layer 1. These sub-conductors have a span of 5 or 7. Within each phase winding in layer 1, adjacent U-shaped sub-conductors are arranged in a concentric nested structure. In the figure, a U-shaped sub-conductor with a span of 7 surrounds a U-shaped sub-conductor with a span of 5. This concentric nested structure reduces the radial dimension occupied by the crown end at this location.

[0052] The second type of U-shaped sub-conductor is a cross-layer conductor, whose two legs are located on the 2nd and 3rd layers, or on the 4th and 5th layers respectively. The span of this type of sub-conductor is 6.

[0053] The third type of U-shaped sub-conductor is a same-layer conductor, both legs of which are located in the 6th layer, and the span of this type of sub-conductor is 6.

[0054] The two codes enclosed in parentheses represent a U-shaped sub-conductor. For example, the U-shaped sub-conductor pointing from A2 to A3 in Figure 2 is represented as (21L2-27L3), where 21L2 indicates that the first leg of the U-shaped sub-conductor is located in the second layer of slot 21, and 27L3 indicates that the second leg of the U-shaped sub-conductor is located in the third layer of slot 27. This U-shaped sub-conductor can also be represented as A2→A3.

[0055] The routing sequence of each branch follows:

[0056] The conductors extend circumferentially toward the adjacent pole in a first circumferential direction (e.g., clockwise) and radially toward a first radial direction (e.g., in the direction of increasing layers). For example, the aforementioned U-shaped sub-conductors (21L2-27L3) extend circumferentially toward the direction of increasing slots and radially toward the direction of increasing layers. The U-shaped sub-conductors connected to A2→A3 are A4→A5, i.e., (33L2-27L3). Similarly, they extend circumferentially toward the direction of increasing slots and radially toward the direction of increasing layers. This continues until it reaches the first or sixth layer. If continuing in the original extension direction results in no available slots, the circumferential and radial extension directions are changed. For example, for the U-shaped sub-conductor A18→A19 of the 6th layer, on the extension path before it, for example, observing the U-shaped sub-conductor A16→A17, the branch extension direction extends in the direction of increasing the number of layers and increasing the number of slots; on the extension path after conductor A18→A19, for example, observing the U-shaped sub-conductor A20→A21, the branch extension direction extends in the direction of decreasing the number of layers and decreasing the number of slots.

[0057] In addition, as can be seen from FIG2 , the number of legs provided at each layer of the flat wire winding of each branch is equal, and the number of legs provided at each pole of the flat wire winding of each branch is equal, and the magnetic circuit of the stator is symmetrical.

[0058] Figure 3 shows the two U-phase branches in Figure 2 separately for clarity. The dashed lines in the figure indicate that adjacent legs of adjacent conductors are welded together, hereinafter referred to as forming a welded pair. In this embodiment, the span of each welded pair is 6.

[0059] The two branches can be connected in series or in parallel.

[0060] Second embodiment

[0061] The second embodiment of the present application will be described with reference to Figure 4. The second embodiment is a modification of the first embodiment, and components having the same or similar structures or functions as those in the first embodiment are denoted by the same reference numerals, and detailed descriptions of these components are omitted.

[0062] The main difference between this embodiment and the first is that each phase winding is inserted into three consecutive slots at each pole, rather than two adjacent full slots. Furthermore, within these three consecutive slots, the first slot occupies the radially outer half, the second slot is fully occupied, and the third slot occupies the radially inner half. This is equivalent to dividing the two adjacent full slots in the first embodiment radially into two halves, and circumferentially staggering these halves by one slot.

[0063] More specifically, in this embodiment, the conductor legs occupy the slots 6*N+K, 6*N+K-1, and 6*N+K+1. N is a natural number; in this embodiment, N = 0, 1, 2, 3, 4, 5, 6, or 7; K is selected from any integer between 2 and 5. The entire 6*N+K slot is occupied, while the 6*N+K-1 and 6*N+K+1 slots, located circumferentially on either side of the 6*N+K slot, occupy the radially outer half and radially inner half of the layers, respectively. For example, in this embodiment, the entire 4th slot (i.e., the 6*0+4th slot) is occupied, the 3rd slot occupies the radially outer layers 1, 2, and 3, and the 5th slot occupies the radially inner layers 4, 5, and 6.

[0064] It should be understood that the direction of the above-mentioned misalignment can also be toward the other side in the circumferential direction, that is, the 6*N+K-1 groove and the 6*N+K+1 groove located on both sides of the 6*N+K groove in the circumferential direction are occupied by the radially inner half layer and the radially outer half layer respectively.

[0065] Another difference between this embodiment and the first embodiment is the span of the welded pairs: the welded pair connecting the legs at the third and fourth layers has a span of 7, while the spans of the remaining welded pairs are 6.

[0066] Third embodiment

[0067] A third embodiment of the present application will be described with reference to Figure 5. The third embodiment is a modification of the first embodiment.

[0068] The main difference between this embodiment and the first embodiment is that the winding in this embodiment forms an odd number of layers in the slots, 5 layers. In this embodiment, only the first layer is inserted with the same-layer conductor, and the U-shaped sub-conductors are inserted in two adjacent layers in the other layers.

[0069] In the solution of odd-numbered layers, each pole and each phase of the winding provided by the present application occupies two consecutive winding slots.

[0070] In this implementation, the routing direction of branch A is: incoming line end-9L1-(15L2-21L3)-(27L4-33L5)-(27L5-21L4)-(15L3-9L2)-(3L1-46L1)-(4L2-10L3)-(16L4-22L5)-(16L5-10L4)-(4L3-46L2) -(40L1-33L1)-(39L2-45L3)-(3L4-9L5)-(3L5-45L4)-(39L3-33L2)-(27L1-22L1)-(28L2-34L3)-(40L4-46L5)-(40L5-34L4)-(28L3-22L2)-16L1-outlet terminal.

[0071] Routing direction of branch B: Incoming end-10L1-(16L2-22L3)-(28L4-34L5)-(28L5-22L4)-(16L3-10L2)-(4L1-45L1)-(3L2-9L3)-(15L4-21L5)-(15L5-9L4)-(3L3-45L2)-(39L1-34L1)-(40L2-46L3)-(4L4-10L5)-(4L5-46L4)-(40L3-34L2)-(28L1-21L1)-(27L2-33L3)-(39L4-45L5)-(39L5-33L4)- (27L3-21L2)-15L1-outlet terminal.

[0072] Most of the U-shaped sub-conductors used in this embodiment have a span of 6, except for the U-shaped sub-conductors located in the first layer, which have a span of 5 or 7; the spans of the welded pairs are all 6.

[0073] Fourth embodiment

[0074] The fourth embodiment shown in Figure 6 is a variation of the third embodiment. The primary difference between this embodiment and the third is that the windings in this embodiment are formed in seven layers within the slots. The winding pattern in this embodiment is similar to that in the third embodiment and will not be further described here. Similarly, most of the U-shaped sub-conductors used in this embodiment have a span of six, except for the U-shaped sub-conductors in the first layer, which have a span of five or seven. The span of the welded pairs in this embodiment is always six.

[0075] Fifth embodiment

[0076] The fifth embodiment of the present application will be described with reference to Figure 7. The fifth embodiment is a variation of the second embodiment. In this embodiment, the number of layers formed in the winding layer is four.

[0077] Similar to the second embodiment, each branch uses I-shaped sub-conductors only at the incoming and outgoing ends, with U-shaped sub-conductors used at all other locations. During branch extension, the U-shaped sub-conductor crosses layers between the second and third layers. The two legs of the same U-shaped sub-conductor can be inserted into the following locations: on the first layer, on the fourth layer, or on the second and third layers, respectively.

[0078] When both legs of the same U-shaped sub-conductor are inserted into the first layer, the span of the U-shaped sub-conductor used is 5 or 7. Furthermore, the spans of the two U-shaped sub-conductors within the same pole are 5 and 7, respectively, forming a concentric nested arrangement. When both legs of the same U-shaped sub-conductor are inserted into the fourth layer, the span of the U-shaped sub-conductor used is 6. When the two legs of the same U-shaped sub-conductor are inserted into the second and third layers, respectively, the span of the U-shaped sub-conductor used is 7.

[0079] The adjacent legs of adjacent U-shaped sub-conductors in a branch are welded together to form a welded pair. The two legs of a welded pair are located on the first and second layers, or on the third and fourth layers, respectively. The span of each welded pair is 6.

[0080] Observing the slots occupied by the two branches of the same phase, the winding slots occupied by the flat wire winding of each phase at each pole include inner and outer slots. The inner slots are two continuous winding slots located in the radially inner two layers, and the outer slots are two continuous winding slots located in the radially outer two layers. The inner and outer slots are offset by one slot in the circumferential direction. For example, in the pole from slots 1 to 6 in Figure 2, the inner slots of the flat wire winding of this phase are the third and fourth layers of slots 4 and 5, while the outer slots are the first and second layers of slots 3 and 4. The inner slots lag behind the outer slots overall by one slot. This circumferential offset of the inner and outer slots reduces the harmonic impact and torque ripple of the winding during operation, thereby improving the overall NVH performance of the motor.

[0081] Sixth embodiment

[0082] A sixth embodiment of the present application will be described with reference to Fig. 8. The sixth embodiment is a modification of the fifth embodiment.

[0083] The main difference between this embodiment and the fifth embodiment lies in the different circumferential staggering of the inner and outer slots. In this embodiment, the inner slots lead the outer slots by one slot overall. The resulting difference is primarily a change in the span of the U-shaped sub-conductors located in the second and third layers. In this embodiment, when the two legs of the same U-shaped sub-conductor are inserted into the second and third layers, respectively, the span of the used U-shaped sub-conductor is 5.

[0084] Seventh embodiment

[0085] A seventh embodiment of the present application will be described with reference to Fig. 9. The seventh embodiment is a modification of the fifth embodiment.

[0086] In this embodiment, each phase includes only one branch, or in other words, the original two branches of each phase are connected together to form one branch.

[0087] It's worth noting that, as described in the first embodiment, when each phase includes two branches, the two branches can be connected in series. This connection can also be equivalent to the phase including only one branch. Assuming the incoming and outgoing terminals of branch A in the first embodiment are connected together, branches A and B are connected in series to form a single branch. In this solution, a variety of U-shaped sub-conductors are available, including conductors with a span of 5 on the same layer, conductors with a span of 7 on the same layer, conductors with a span of 7 across layers, and conductors with a span of 6 on the same layer.

[0088] However, this embodiment is slightly different from the first embodiment in that the two branches are connected in series. Referring to Figure 9, this embodiment adjusts the winding method so that the span of the conductors on the same layer is only 7 in one place and the spans of the rest are 6. Among them, the conductors on the same layer with a span of 7 appear in the U-shaped sub-conductor connecting the pole where the incoming line end and the pole where the outgoing line end of the branch are located, that is, the U-shaped sub-conductor with two legs located in the first layer of the 3rd slot and the first layer of the 10th slot in the figure respectively. In this embodiment, the spans of the two legs welded together of the adjacent sub-conductors are both 6; the spans of the cross-layer U-shaped sub-conductors located in the two layers in the radial middle are both 7. There are fewer types of conductors in this embodiment, and the same-layer sub-conductors are arranged closely together to save space, so that the crown end has a smaller size.

[0089] It should be understood that the above-described embodiments and some aspects or features thereof may be appropriately combined. For example, referring to the fifth embodiment in which the inner and outer positions are circumferentially staggered in different directions, the span of the U-shaped sub-conductors located in the radially middle two layers in the sixth embodiment may also be 5. For another example, in the sixth embodiment, A1 and A64 may be connected together to form a U-shaped sub-conductor, and the span of this U-shaped sub-conductor in the same layer may be 5; while the connection between A32 and A33 is opened, so that A32 and A33 are provided with I-shaped sub-conductors, respectively, as the input and output terminals.

[0090] Eighth embodiment

[0091] An eighth embodiment of the present application will be described with reference to Figures 10 and 11. The eighth embodiment is a modification of the first embodiment.

[0092] In this application, the number of winding poles is 12, the number of winding slots in the core is 72, each phase winding includes 2 branches, and 8 layers are formed in the winding slots. The number of winding slots per pole and per phase is still 2.

[0093] Figure 10 combines the routing sequences of the two branches into one diagram to facilitate visualization of the relationship between the two branches. Figure 11 shows the routing sequences of the two branches separately to clearly illustrate the routing sequence of each branch.

[0094] The number of slots occupied by each branch in each layer is equal to the number of poles, 12. For a slot occupied by a phase conductor, the number of layers occupied by the two branches in the slot is equal, both 4. This wiring arrangement ensures a balanced magnetic circuit formed by the winding.

[0095] On the first and eighth layers, both legs of the U-shaped hairpin are inserted into the same layer; the pitch (the number of slots between the legs) of the U-shaped hairpin on the first layer is 5 or 7, and the pitch of the U-shaped hairpin on the eighth layer is 6. On layers other than the first and eighth layers, the two legs of the U-shaped hairpin are inserted into two adjacent layers, such as the second and third layers, the fourth and fifth layers, and the sixth and seventh layers; and the pitch of these U-shaped hairpins is always 6. Along the extension direction of the branch, the adjacent legs of adjacent hairpins are welded together, and the pitch between the two welded ends is always 6.

[0096] Ninth embodiment

[0097] A ninth embodiment of the present application will be described with reference to Fig. 12. The ninth embodiment is a modification of the eighth embodiment.

[0098] The main difference between this embodiment and the eighth embodiment is that the two branches of each phase extend into three consecutive slots, but these three slots are not fully occupied; only the middle slot is occupied, defined as slot K, while the K-1th slot and the K+1th slot occupy layers 1 to 4 and layers 5 to 8, respectively. Alternatively, for layers 1 to 4, the two branches of each phase occupy two consecutive half-slots; for layers 5 to 8, the two branches of each phase occupy two consecutive half-slots; these two sets of consecutive half-slots are staggered by one slot in the circumferential direction.

[0099] This variation brings about a change in the pitch of some conductors. Specifically, for the U-shaped hairpins inserted into the 4th and 5th layers, the pitch is 7.

[0100] Tenth embodiment

[0101] The tenth embodiment of the present application will be described with reference to Fig. 13. The tenth embodiment is a modification of the ninth embodiment.

[0102] The main difference between this embodiment and the second embodiment is that the circumferential staggered directions of the two groups of half slots occupied by the two branches of each phase are different. This variation makes the pitch of the U-shaped hairpins inserted in the 4th and 5th layers changed to 5.

[0103] Eleventh embodiment

[0104] An eleventh embodiment of the present application will be described with reference to Fig. 14. The eleventh embodiment is a modification of the eighth and seventh embodiments.

[0105] In this embodiment, the incoming line end and the outgoing line end are both located at the welding end, which is equivalent to connecting the incoming line end and the outgoing line end of the same branch of the original crown end in the first embodiment together, for example, connecting the unshaded numbers 1 and 96 together at the crown end in Figure 14; at the same time, opening an original welding pair, that is, the unshaded numbers 96 and 95 in Figure 14, as the new incoming line end and outgoing line end, respectively.

[0106] It should be understood that the above-mentioned embodiments and some aspects or features thereof may be appropriately combined.

[0107] The above description is merely an embodiment of the present application. The scope of protection of the present application is not limited by these specific embodiments, but is determined by the claims of the present application. For those skilled in the art, the present application may be subject to various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the technical ideas and principles of the present application shall be included in the scope of protection of the present application. For example:

[0108] (i) The present application can also be extended to windings with other numbers of layers and other numbers of slots (satisfying that the number of winding slots per pole and per phase is 2).

[0109] (ii) In the present application, the first layer may be the radially outermost layer or the radially innermost layer.

Claims

1. A stator of a flat wire motor, comprising an iron core and a flat wire winding, wherein the flat wire winding has a three-phase winding, wherein the flat wire winding of each phase comprises two branches, wherein each branch comprises a plurality of sub-conductors, wherein the sub-conductors comprise two I-shaped sub-conductors and a plurality of U-shaped sub-conductors, wherein two legs of the U-shaped sub-conductor are connected at one end to form a crown end and separated at the other end to form a welding end, wherein the two I-shaped sub-conductors are respectively located at the inlet and outlet ends of each branch, wherein: The number of layers of the flat wire winding formed in the winding slot is M, where M is an integer not less than 4, and the number of winding slots per pole per phase of the flat wire motor is 2. The inlet and outlet ends of the two branches are both located on the first layer. In the first layer, the two legs of the U-shaped sub-conductor are located on the same layer. The spans of the two U-shaped sub-conductors of each pole and each phase are 5 and 7 respectively. The spans of the U-shaped sub-conductors inserted into the remaining layers are all 6. In the 2nd to M-1th layers, the two legs of the U-shaped sub-conductor are located in two adjacent layers respectively. When M is an odd number, one leg of the U-shaped sub-conductor is inserted into the Mth layer and the other leg is located in the M-1th layer. In the case where M is an even number, the U-shaped sub-conductor having one leg inserted into the Mth layer has the other leg also located in the Mth layer.

2. The stator of the flat wire motor according to claim 1, characterized in that: When M is an odd number, the sub-conductors occupy two consecutive winding slots per pole and per phase.

3. The stator of the flat wire motor according to claim 1, characterized in that: When M is an even number, in each pole and each phase, the sub-conductor occupies two consecutive winding slots or the sub-conductor extends into three consecutive winding slots.

4. The stator of the flat wire motor according to claim 2 or 3, characterized in that: Adjacent legs of two adjacent U-shaped sub-conductors welded together form a welding pair, and each welding pair has a span of 6.

5. The stator of the flat wire motor according to claim 1, characterized in that: When M is an even number, in each pole and each phase, the slots into which the legs of the sub-conductors are inserted are the 6*N+K slot, the 6*N+K-1 slot and the 6*N+K+1 slot, wherein the 6*N+K slot is occupied as a whole, the 6*N+K-1 slot and the 6*N+K+1 slot occupy the radially outer half and the radially inner half respectively, or the 6*N+K-1 slot and the 6*N+K+1 slot occupy the radially inner half and the radially outer half respectively, N is a natural number, and K is selected from any integer from 2 to 5.

6. The stator of the flat wire motor according to claim 5, characterized in that: Adjacent legs of two adjacent U-shaped sub-conductors welded together form a welded pair. The span of the welded pairs whose legs are located at the M / 2th layer and the M / 2+1th layer respectively is 7, and the span of the remaining welded pairs is 6.

7. The stator of the flat wire motor according to claim 1, characterized in that: The routing of each branch extends in the same circumferential direction and toward adjacent poles, and in the same radial direction toward adjacent layers, until encountering the first layer or the Mth layer. If there are no free slots to be filled in the original extension direction, the direction of circumferential extension and radial extension is changed.

8. The stator of the flat wire motor according to any one of claims 1 to 7, characterized in that: The first layer is the innermost layer in the radial direction, and the Mth layer is the outermost layer in the radial direction, or The first layer is the radially outermost layer, and the Mth layer is the radially innermost layer.

9. The stator of the flat wire motor according to claim 8, characterized in that: The two branches of each phase are connected into one branch, and the incoming and outgoing terminals of the branch are located at two adjacent poles.

10. The stator of the flat wire motor according to claim 9, characterized in that: The span of the U-shaped sub-conductors in the radial innermost layer and the radial outermost layer is 6, 5 or 7, wherein: The situation where the span of the radially innermost and radially outermost U-shaped sub-conductors is 5 or 7 only occurs at one place in the entire branch, which is located at the two poles where the U-shaped sub-conductors connect the incoming and outgoing terminals.

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