Stator of flat wire motor and flat wire motor
By adopting three-phase flat wire windings and specific conductor hierarchy, the problems of diverse types and high production costs of U-shaped conductors of flat wire motors are solved, and low-cost, excellent insulation performance and efficient operation are achieved.
Patent Information
- Application Number
- CN202420845136.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-23
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-04-23
AI Technical Summary
The U-shaped sub-conductors of existing flat wire motors are of varying types and high production costs, resulting in complex windings and risk of insulation failure.
Three-phase flat wire windings, including I-shaped subconductors and U-shaped subconductors, form a cross-layer winding through specific winding methods and conductor hierarchy structures, avoid windings of the same layer, simplify the types of conductors and winding methods, and improve insulation performance. .
It reduces production costs, improves insulation performance and reliability, realizes magnetic circuit symmetry, and improves operating efficiency.
Smart Images
Figure CN222356080U_ABST
Abstract
Description
Technical Field
[0001] 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 and the flat wire motor. Background Art
[0002] For a flat wire motor, its stator winding includes a plurality of hairpin coils, which are inserted into the slots of the stator core in a certain arrangement to form the required winding of a single-phase motor or a multi-phase motor.
[0003] There are many types of hairpin coils used in the prior art, also referred to as U-shaped sub-conductors below, and the winding routing methods are diverse, which leads to high manufacturing costs of the U-shaped sub-conductors and may require the use of same-layer windings, which makes the stator end cross-wires complex and poses a potential risk of insulation failure. Utility Model Content
[0004] The purpose of the utility model is to overcome or at least alleviate the deficiencies of the above-mentioned prior art, and to provide a stator of a flat wire motor and a flat wire motor.
[0005] According to a first aspect of the technical solution, a stator of a flat wire motor is provided, comprising an iron core and a flat wire winding, wherein the flat wire winding has a three-phase winding, the number of poles of the flat wire winding is 8, the number of winding slots of the iron core is 48, the flat wire winding of each phase comprises 4 branches, each of the branches comprises 2 I-shaped sub-conductors and a plurality of U-shaped sub-conductors, the two legs of the U-shaped sub-conductor are connected at one end to form a crown end, and are separated at the other end to form a welding end, the two I-shaped sub-conductors are respectively located at the incoming end and the outgoing end of each branch, wherein:
[0006] The number of layers of the flat wire winding formed in the winding slot is M, where M is an even number greater than 2.
[0007] The conductor of each branch occupies two adjacent complete winding slots in each pole,
[0008] Each of the U-shaped sub-conductors includes a large span conductor and a small span conductor, wherein two legs of the small span conductor are respectively inserted into two adjacent layers, and two legs of the large span conductor are respectively inserted into the radial innermost layer and the radial outermost layer.
[0009] The span of the small cross-layer conductor is 6, and the span between two adjacent welding legs is 6.
[0010] In at least one embodiment, in each branch, the U-shaped sub-conductors extend in the same circumferential direction.
[0011] In at least one embodiment, in each branch, all the small cross-layer conductors extend in the same circumferential direction.
[0012] The extending direction of at least part of the large cross-layer conductors in the circumferential direction is different from the extending direction of the adjacent small cross-layer conductors in the circumferential direction.
[0013] In at least one embodiment, the span of the large cross-layer conductor is 5, 6 or 7.
[0014] In at least one embodiment, the four branches of each phase occupy the same number of positions in each winding slot, and the four branches of each phase occupy the same number of positions in each layer.
[0015] In at least one embodiment, the inlet terminal is located at the radial innermost layer or the radial outermost layer of the stator slot.
[0016] The outlet terminal is located at the radial innermost layer or the radial outermost layer of the stator slot.
[0017] In at least one embodiment, the four branches of each phase are connected in series.
[0018] In at least one embodiment, the four branches of each phase are connected in parallel.
[0019] In at least one embodiment, the four branches of each phase are connected in series in pairs to form a small branch, and the two small branches are connected in parallel.
[0020] According to a second aspect of the present application, a flat wire motor is provided, comprising the stator of the flat wire motor according to the first aspect of the present application.
[0021] The flat wire motor according to the technical solution has a simple stator structure, a small number of sub-conductor structure types, low manufacturing cost, and flexible winding methods; there is no same-layer winding, good insulation performance, high reliability; symmetrical magnetic circuit, high operating efficiency. The flat wire motor according to the present application has the same advantages. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 is a schematic diagram of a stator of a flat wire motor according to a first embodiment of the present application.
[0023] Figure 2 yes Figure 1 A view of the crown end viewed axially.
[0024] Figure 3 It is a schematic diagram of two possible connection modes of the four-branch three-phase windings of the stator of the flat wire motor according to the present application.
[0025] Figure 4 It is a schematic diagram of the wiring arrangement of the stator winding of the flat wire motor according to the first embodiment of the present application.
[0026] Figure 5Schematic diagram of three sub-conductors of different structures of the stator of the flat wire motor according to the first embodiment of the present application.
[0027] Figure 6 It is a schematic diagram of a variation of the wiring arrangement of the stator winding of the flat wire motor according to the first embodiment of the present application.
[0028] Figure 7 It is a schematic diagram of another variation of the wiring arrangement of the stator winding of the flat wire motor according to the first embodiment of the present application.
[0029] Figure 8 yes Figure 7 A schematic diagram of the structure of a sub-conductor involved in.
[0030] Figures 9 to 11 Schematic diagrams of three possible variations of the routing of the windings of the stator of the flat wire motor according to the second embodiment of the present application.
[0031] Figure 12 to Figure 14 Schematic diagrams of three possible variations of the wiring pattern of the stator winding of the flat wire motor according to the third embodiment of the present application.
[0032] Description of reference numerals:
[0033] S stator core; W winding; W1 I-shaped sub-conductor; W2 U-shaped sub-conductor. DETAILED DESCRIPTION
[0034] The following describes exemplary embodiments of the present invention with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present technical solution, and are not intended to exhaust all feasible methods of the solution, nor to limit the scope of the present invention.
[0035] First embodiment
[0036] Reference Figures 1 to 7 , a stator of a flat wire motor according to a first embodiment of the present application is introduced. The stator includes an iron core S and a winding W. The winding W includes an I-shaped sub-conductor W1 and a U-shaped sub-conductor W2.
[0037] The winding includes three phases, each phase of the winding includes 4 branches, the number of poles of the winding is 8, the number of winding slots of the iron core S is 48, and the winding forms 8 layers in the slots.
[0038] These four branches can be Figure 3 In case (a) of FIG. 1 , the two circuits can be connected in parallel to each other to adapt to a low voltage platform (e.g., a 400V platform), or as shown in FIG. Figure 3As in case (b) in the figure, two branches are connected in series to form small branches, and then the small branches are connected in parallel to form a hybrid structure, for example, to adapt to high-voltage platforms (such as 800V platforms). Of course, the four branches of each phase can also be connected in series. It is worth noting that Figure 3 Only the case where the three-phase windings are connected in a star shape is shown. According to different design requirements, the three-phase windings can also be connected in a triangle shape.
[0039] Each branch includes a plurality of sub-conductors, specifically, the sub-conductors of each branch include two I-shaped sub-conductors and a plurality of 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 incoming end and the outgoing end of each branch.
[0040] Figure 4 The winding routing sequence of one phase (for example, the U phase) is shown. It should be understood that the windings of the other two phases can be obtained by translating the U phase. The 48 columns in the figure represent 48 slots. It should be understood that the figure is equivalent to a schematic diagram of the iron core being unfolded circumferentially; the 8 rows represent the 8 conductor layers formed in the slots. The combination of letters and numbers in the figure represents the routing sequence of a branch, or the series sequence. For example, branch A starts from the incoming terminal A1 and follows the sequence of A2, A3, A4... until A32 is the outgoing terminal. I-shaped sub-conductors are used at the incoming and outgoing terminals, and U-shaped sub-conductors are used at the remaining positions.
[0041] Figure 4 Lines are used to indicate the position of each conductor of one of the branches (branch A) of the phase, where the straight line represents the I-shaped sub-conductor and the solid curved line represents the U-shaped sub-conductor. In a more vivid way, the curved line can be understood as the crown end of the U-shaped sub-conductor, or the appearance of the U-shaped sub-conductor viewed from the crown end. The dotted lines in the figure indicate the connection of the welding end. For example, the dotted line connecting A1 and A2 indicates that the leg of the I-shaped sub-conductor is welded to the first leg of the first U-shaped sub-conductor, and the dotted line connecting A3 and A4 indicates that the second leg of the first U-shaped sub-conductor is welded to the first leg of the second U-shaped sub-conductor.
[0042] As can be seen in the figure, except for the radially outermost layer and the radially innermost layer, that is, except for the 1st layer and the 8th layer, in the 2nd to 7th layers, the two legs of each U-shaped sub-conductor are located in adjacent layers, and these U-shaped sub-conductors are hereinafter referred to as "small-spanning-layer sub-conductors". The remaining U-shaped sub-conductors in the branch span the 1st layer and the 8th layer, and the U-shaped sub-conductors with legs located in the innermost layer and the outermost layer are hereinafter referred to as "large-spanning-layer conductors".
[0043] Following the series connection sequence of the conductors, it can be found that the U-shaped sub-conductors in the branch first extend in the same direction in the circumferential direction of the stator core until they encounter the "large span layer conductor", or until they cross the radial innermost layer or the radial outermost layer. For example, the first U-shaped sub-conductor, for the convenience of description, is also referred to as the U-shaped sub-conductor A2-A3 by the serial numbers of the two legs of the conductor, and the conductor string formed by the second U-shaped sub-conductor A4-A5 and the third U-shaped sub-conductor A6-A7 extends in the circumferential direction along the direction of increasing slot numbers until they cross to the 8th layer and encounter the large span layer conductor A8-A9.
[0044] In this embodiment, the extension direction of the large span layer conductor in the branch is opposite to the extension direction of the conductor string before and after. For example, the extension direction of the large span layer conductor A8-A9 is the direction of decreasing slot number. The U-shaped sub-conductors A10-A11, A12-A13 and A14-A15 connected in series in sequence after the large span layer conductor A8-A9 extend in the direction of increasing slot number.
[0045] In this embodiment, the span of each small span conductor is 6, and the span of the large span conductor can be 6 or 5. The selection of the span of the large span conductor only needs to satisfy the following requirement: the slots occupied by all the conductors of the phase of the branch are two continuous full slots in each pole. Figure 4 It can be seen that the conductor of this phase occupies the entire slot 1 and slot 2 in the first pole, and occupies the entire slot 7 and slot 8 in the second pole.
[0046] Therefore, for the large-span layer conductor A8-A9, for example, when one leg (A8) is determined to be inserted into slot 43, the only slots that can be selected for the other leg (A9) are slot 37 and slot 38. In this embodiment, slot 37 is selected, and the corresponding span of the large-span layer conductor A8-A9 is 6; for another example, for the large-span layer conductor A16-A17, when one leg (A16) is determined to be inserted into slot 31, the only slots that can be selected for the other leg (A17) are slot 25 and slot 26. In this embodiment, slot 26 is selected, and the corresponding span of the large-span layer conductor A16-A17 is 5.
[0047] Since the conductor of each phase occupies two adjacent slots at each pole, in the same direction in the circumferential direction, the first slot of the two adjacent slots is defined as the first phase slot, and the second slot is defined as the second phase slot. In this embodiment, slots 1, 7, 13, 19, 25, 31, 37 and 43 are first phase slots, and slots 2, 8, 14, 20, 26, 32, 38 and 44 are second phase slots.
[0048] The two legs of the large cross-layer conductors A8-A9 are inserted into the in-phase slots, and the two legs of the large cross-layer conductors A16-A17 are inserted into the out-of-phase slots. The two legs of the small cross-layer conductors are both located in the in-phase slots.
[0049] In this embodiment, the slot distance between the two legs of adjacent conductors welded together is 6. Therefore, when the two legs of the large cross-layer conductor are inserted into the out-of-phase slot, the legs of the small cross-layer conductors connected to the front and back of the large cross-layer conductor are in different phases. For example, the two legs of the large cross-layer conductor A16-A17 are inserted into the out-of-phase slot, and the legs of the small cross-layer conductor before it, such as conductors A14-A15, are located in the first phase slot; the legs of the small cross-layer conductor after it, such as conductors A18-A19, are located in the second phase slot.
[0050] like Figure 5 As shown, in this embodiment, only three conductors of different shapes need to be used, namely (a) I-shaped sub-conductors, (b) small cross-layer conductors, and (c) large cross-layer conductors (reverse cross-slots). The cost of the mold for winding molding is low.
[0051] The windings used in this embodiment are all cross-layer windings, which avoids the risks of potential insulation failure caused by the complexity of cross-wires at the ends of the same-layer windings.
[0052] In addition, observation Figure 4 It can also be found that the winding of this patent adopts a completely symmetrical structure in the magnetic circuit, the four branches occupy the same number of positions in each slot, and the four branches occupy the same number of positions in each layer, for example, the four branches in slot 1 each occupy 2 positions, and the four branches in layer 1 each occupy 4 positions. The symmetrical magnetic circuit structure can eliminate the problem of circulating current caused by the asymmetric structure, reduce additional losses and improve operating efficiency.
[0053] Figure 6 A modified winding arrangement of this embodiment is shown. Figure 4 The difference between the winding arrangements shown mainly lies in whether the two legs of the large-span conductor are located in the same phase slot. Figure 6 Only the positions of the large-span layer conductors are marked with curved lines. The two legs of each large-span layer conductor in this variation are located in the out-of-phase slots.
[0054] In this variation, the large span conductor may have a span of 7.
[0055] Figure 7 Shows Figure 6 Another variant of the winding arrangement of this embodiment is shown. Figure 4The difference between the winding arrangement shown is mainly that the extension direction of the large-span layer conductor in the branch can also be the same as the extension direction of the front and rear conductor strings. Figure 7 Only the locations of the large-span layer conductors are marked with curved lines. Figure 7 The large cross-layer conductor A24-A25 in the circuit extends in the direction of increasing slot numbers, and the conductors before and after the series connection also extend in the direction of increasing slot numbers. Figure 5 In case (c), the large cross-layer conductor across the slot in the reverse direction, the structure of the large cross-layer conductor across the slot in the forward direction is shown in FIG. Figure 8 .
[0056] Figure 7 In the variation shown, since the large cross-layer conductors that cross the slots in the forward direction and the slots in the reverse direction exist at the same time, the number of layers of the end wire package will be increased, which will take up a certain amount of extra space.
[0057] Second embodiment
[0058] Figures 9 to 11 The second embodiment of the present application is shown. The main difference between this embodiment and the first embodiment is the number of layers in the winding groove. In this embodiment, 6 layers are formed in the winding groove.
[0059] Figures 9 to 11 There are three different variations. Similar to the first embodiment, the span and slot direction of the large cross-layer conductor can be flexibly selected when the following conditions are met.
[0060] (i) Both legs of the small cross-layer conductor are located in the same phase slot, or the span of the small cross-layer conductor is 6.
[0061] (ii) The span of the welded legs between adjacent conductors is 6.
[0062] (iii) The slots occupied by all conductors of the phase in the branch are two consecutive full slots in each pole.
[0063] Similarly, for ease of illustration, only the locations of large cross-layer conductors are marked with curves in the figure.
[0064] Third embodiment
[0065] Figure 12 to Figure 14 The third embodiment of the present application is shown. The main difference between this embodiment and the first embodiment is the number of layers in the winding groove. In this embodiment, four layers are formed in the winding groove.
[0066] Figure 12 to Figure 14 These are three different variations included in this embodiment. Similar to the first and second embodiments, the span and slot direction of the large cross-layer conductor can be flexibly selected under the condition of satisfying the above three conditions.
[0067] It should be understood that the above embodiments and some aspects or features thereof can be appropriately combined. It should be understood that the winding method provided in the present application can be extended to form a stator with more even number of layers in the slots.
[0068] Of course, the present solution is not limited to the above-mentioned implementation modes. Under the guidance of the present solution, those skilled in the art can make various modifications to the above-mentioned implementation modes of the present solution without departing from the scope of this patent.
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, the number of poles of the flat wire winding is 8, the number of winding slots of the iron core is 48, the flat wire winding of each phase comprises 4 branches, each of the branches comprises 2 I-shaped sub-conductors and a plurality of U-shaped sub-conductors, the two legs of the U-shaped sub-conductor are connected at one end to form a crown end, and are separated at the other end to form a welding end, the two I-shaped sub-conductors are respectively located at the inlet and outlet ends of each branch, characterized in that: The number of layers of the flat wire winding formed in the winding slot is M, where M is an even number greater than 2. The conductor of each branch occupies two adjacent complete winding slots in each pole, Each of the U-shaped sub-conductors includes a large span conductor and a small span conductor, wherein two legs of the small span conductor are respectively inserted into two adjacent layers, and two legs of the large span conductor are respectively inserted into the radial innermost layer and the radial outermost layer. The span of the small cross-layer conductor is 6, and the span between two adjacent welding legs is 6.
2. The stator of the flat wire motor according to claim 1, characterized in that: In each branch, the U-shaped sub-conductors extend in the same direction in the circumferential direction.
3. The stator of the flat wire motor according to claim 1, characterized in that: In each branch, all small cross-layer conductors extend in the same circumferential direction. The extending direction of at least part of the large cross-layer conductors in the circumferential direction is different from the extending direction of the adjacent small cross-layer conductors in the circumferential direction.
4. The stator of the flat wire motor according to claim 1, characterized in that: The large spanning layer conductor has a span of 5, 6 or 7.
5. The stator of the flat wire motor according to claim 1, characterized in that: The four branches of each phase occupy the same number of positions in each winding slot, and the four branches of each phase occupy the same number of positions in each layer.
6. The stator of the flat wire motor according to any one of claims 1 to 5, characterized in that: The wire inlet end is located at the radial innermost layer or the radial outermost layer of the winding slot, The wire outlet end is located at the radial innermost layer or the radial outermost layer of the winding groove.
7. The stator of the flat wire motor according to any one of claims 1 to 5, characterized in that: The four branches of each phase are connected in series.
8. The stator of the flat wire motor according to any one of claims 1 to 5, characterized in that: The four branches of each phase are connected in parallel.
9. The stator of the flat wire motor according to any one of claims 1 to 5, characterized in that: The four branches of each phase are connected in series in pairs to form a small branch, and the two small branches are connected in parallel.
10. A flat wire motor, characterized in that: A stator comprising the flat wire motor according to any one of claims 1 to 9.