Stator assembly with balanced structure and motor

Abstract

The utility model relates to the technical field of flat wire motors, in particular to a stator assembly with a balanced structure and a motor. The stator assembly comprises a stator core, a stator winding and a star point copper bar group; the stator winding is wound on the stator iron core; the stator winding is a three-phase winding, and the number of branches of each phase winding is an even number. The star point copper bar group comprises a first star point copper bar and three second star point copper bars; and the first star point copper bar and the second star point copper bar are respectively arranged on the same end side of the stator winding. The inner side and the outer side of the first star point copper bar are connected and fixed through the star point lines, so that the first star point copper bar is connected more stably, and the overall stress is balanced. And the inner side and the outer side of the second star point copper bar are connected and fixed by the outgoing lines, so that the second star point copper bar is connected more stably, and the overall stress is balanced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the flat wire motor technical field, especially relate to a stator subassembly and motor of structure balanced. BACKGROUND

[0002] In the existing flat wire motor scheme, when the branch number of each phase winding of the stator winding is 4, and the winding is mainly in the integer distance span, the outgoing line or star point line of each branch is far away from the outgoing line position. It is difficult to realize concentrated outgoing line, which increases the process difficulty.

[0003] In order to reduce the process difficulty, the outgoing line position of each branch is usually arranged at the outermost layer of the stator core in the existing motor scheme. Figure 1 As shown in the figure, the copper bar 1 is used to connect the star point line, and the copper bar 1 is welded on the outer circle side of the end winding, which is equivalent to hanging on the end winding. The copper bar 1 is easily subjected to a force towards the outer circle side of the end winding. The copper bar 2 is used to connect the outgoing line, and the connecting terminal on the copper bar 2 is arranged on the same side, which causes the center of gravity of the copper bar 2 to deviate to one side of the connecting terminal. Therefore, the outgoing line position and the copper bar structure of the existing motor scheme cause the imbalance of the overall structure of the motor, which affects the performance of the whole machine. UTILITY MODEL CONTENTS

[0004] In view of the above problems, the utility model provides a stator subassembly with balanced structure, which comprises a stator core, a stator winding and a star point copper bar group.

[0005] The stator winding is a three-phase winding, and the branch number of each phase winding is even.

[0006] The star point copper bar group comprises a first star point copper bar and three second star point copper bars; the first star point copper bar and the second star point copper bar are respectively installed on the same end side of the stator winding.

[0007] The first star point copper bar comprises a first main body and a plurality of first connecting terminals; the first main body is substantially an axis-curved plane plate; half of the first connecting terminals are arranged on the inner circle side of the first main body; the other half of the first connecting terminals are arranged on the outer circle side of the first main body.

[0008] Each second star point copper bar comprises a second main body, a plurality of second connecting terminals and an external large terminal; the second main body is substantially an axis-curved plane plate; half of the second connecting terminals are arranged on the inner circle side of the second main body; the other half of the second connecting terminals are arranged on the outer circle side of the second main body; and the external large terminal is arranged on one side of the second main body.

[0009] Further, the branch number of each phase winding is 4.

[0010] Half of the star point lines of the stator winding are distributed in the layer closest to the inner side of the stator core in the stator slot, and are connected with the first connection terminals on the inner side of the first star point copper bar respectively.

[0011] The outgoing lines of the four branches of the same phase winding are distributed in two adjacent stator slots, and are connected with the second connection terminals on the second star point copper bar respectively; wherein, the outgoing lines of two branches are located in the layer closest to the inner side of the stator core in the two stator slots, and are connected with the second connection terminals on the inner side of the second star point copper bar respectively; the outgoing lines of the other two branches are located in the layer closest to the outer side of the stator core in the two stator slots, and are connected with the second connection terminals on the outer side of the second star point copper bar respectively.

[0012] Further, the number of slots per pole per phase Q of the stator winding is greater than or equal to 2, and the number of poles P is an integral multiple of 8.

[0013] Three second star point copper bars are arranged along the circumference of the stator core in sequence, and any two adjacent second star point copper bars are spaced by Q stator slots.

[0014] Further, the three second star point copper bars are oppositely distributed with a first star point copper bar on the same end side of the stator winding.

[0015] Further, b rectangular conductors are arranged in each stator slot along the radial direction of the stator core, and b is an even number greater than or equal to 4.

[0016] Further, the connection mode of the stator winding at the hairpin end includes: adopting a combined pitch arrangement mode; the No. 1 conductor in one stator slot is connected with the No. 1 conductor in another stator slot; the No. c conductor in one stator slot is connected with the No. c+1 conductor in another stator slot; the No. b conductor in one stator slot is connected with the No. b conductor in another stator slot; wherein, 2≤c<b, and c is an even number.

[0017] The connection mode of the stator winding at the welding end includes: adopting a single pitch arrangement mode; the No. d conductor in one stator slot is connected with the No. d+1 conductor in another stator slot; wherein, 1≤d<b, and d is an odd number.

[0018] Further, when the number of slots per pole per phase Q is 2, the combined pitch arrangement mode is: simultaneously adopting a combination of 5, 6 and 7 span distances; and the single pitch arrangement mode is: only adopting a span distance of 6.

[0019] The utility model further provides a motor which is balanced in structure, the motor comprises the above-mentioned stator assembly.

[0020] The utility model has the advantages of:

[0021] 1. In the present invention, the inner and outer sides of the first star-point copper busbar are connected and fixed by star-point wires, making the connection of the first star-point copper busbar more stable and the overall force balanced. The inner and outer sides of the second star-point copper busbar are connected and fixed by lead wires, making the connection of the second star-point copper busbar more stable and the overall force balanced.

[0022] 2. The lead wires for each phase winding are distributed between two adjacent stator slots, facilitating centralized lead delivery. Furthermore, the lead wires and star point wire exit positions are equivalent to a 180° rotation around the stator core circumference. The first and second star point copper bars are symmetrically positioned around a single diameter of the stator core. This ensures structural and force balance at the ends of the stator assembly.

[0023] 3. The winding connection scheme provided by the present invention has the same number of components in each branch of each phase winding, and the same number of phase slots and layers passed by each branch. This basically achieves the same phase and size of the back electromotive force of each branch, the same resistance and inductance at the beginning and end of each branch, and realizes a balanced arrangement of the three-phase winding.

[0024] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be achieved and obtained by the structures indicated in the description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 The figure shows a schematic diagram of the copper bar structure of the stator winding in the prior art;

[0027] Figure 2 Shows a schematic structural diagram of a stator assembly according to an embodiment of the present utility model;

[0028] Figure 3 A schematic diagram showing the arrangement of the star point copper bars on the stator assembly of an embodiment of the present utility model is shown;

[0029] Figure 4 A schematic structural diagram of a first star-point copper busbar according to an embodiment of the present invention is shown;

[0030] Figure 5 A schematic structural diagram of a second star-point copper busbar according to an embodiment of the present invention is shown;

[0031] Figure 6 A schematic diagram of the arrangement of wires in the stator slots of an embodiment of the present utility model is shown.

[0032] In the figure: 1- stator core; 2- stator winding; 3- star point copper bar group; 31- first star point copper bar; 311- first body; 312- first connection terminal; 32- second star point copper bar; 321- second body; 322- second connection terminal; 323- external large terminal. DETAILED DESCRIPTION

[0033] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0034] The present invention provides a structurally balanced motor, comprising a stator assembly. Figure 2 As shown, the stator assembly includes a stator core 1, a stator winding 2 and a star point copper bar group 3; the stator winding 2 is wound on the stator core 1 and is divided into an in-slot winding and an end winding; the in-slot winding is located in the stator slot of the stator core, and each stator slot has a plurality of rectangular wires arranged radially along the stator core; the end winding is located at both ends of the stator core.

[0035] The stator winding 2 is a three-phase winding, and the number of branches of each phase winding is an even number.

[0036] like Figure 3 As shown, the star point copper bar group includes a first star point copper bar 31 and three second star point copper bars 32. The first star point copper bar 31 and the second star point copper bar 32 are respectively installed on the same end side of the stator winding.

[0037] like Figure 4 As shown, the first star-point copper busbar 31 includes a first body 311 and a plurality of first connecting terminals 312. The first body 311 is a generally planar plate with an axially bent shape. Half of the first connecting terminals 312 are arranged on the inner circumference of the first body 311 for connecting to half of the star-point line of the stator winding 2. The other half of the first connecting terminals 312 are arranged on the outer circumference of the first body 311 for connecting to the other half of the star-point line of the stator winding 2.

[0038] like Figure 5As shown, each of the second star point copper bars 32 comprises a second main body 321, a plurality of second connecting terminals 322 and an external large terminal 323. The second main body 321 is substantially an axis-curved plane plate; one half of the second connecting terminals 322 are arranged on the inner circle side of the second main body 321 and used for connecting outgoing wires of half of the branches in the same phase winding; the other half of the second connecting terminals 322 are arranged on the outer circle side of the second main body 321 and used for connecting outgoing wires of the other half of the branches in the same phase winding. The external large terminal 323 is arranged on one side of the second main body 321 and used for connecting an external power supply.

[0039] In the utility model, the inner side and the outer side of the first star point copper bar are connected and fixed by outgoing wires, so that the first star point copper bar is more stable in connection and balanced in overall stress. The inner side and the outer side of the second star point copper bar are connected and fixed by star point wires, so that the second star point copper bar is more stable in connection and balanced in overall stress.

[0040] Further, the number of branches of each phase winding is 4.

[0041] Half of the star point wires of the stator winding are distributed in a layer closest to the inner circle side of the stator core in each stator slot and are respectively connected with the first connecting terminals on the inner circle side of the first star point copper bar.

[0042] The outgoing wires of the four branches of the same phase winding are distributed in two adjacent stator slots and are respectively connected with the second connecting terminals on one second star point copper bar; wherein, the outgoing wires of two branches are respectively located in a layer closest to the inner circle side of the stator core in two stator slots and are respectively connected with the second connecting terminals on the inner circle side of the second star point copper bar; the outgoing wires of the other two branches are respectively located in a layer closest to the outer circle side of the stator core in two stator slots and are respectively connected with the second connecting terminals on the outer circle side of the second star point copper bar.

[0043] Further, the number of slots per pole per phase Q of the stator winding is greater than or equal to 2, and the number of poles P is an integral multiple of 8.

[0044] The three second star point copper bars are arranged along the circumference of the stator core in sequence, and any two adjacent second star point copper bars are spaced by Q stator slots.

[0045] The outgoing wires of the stator winding realize concentrated outgoing wires, and the three second star point copper bars are arranged adjacent to each other, which is convenient for motor structure design.

[0046] Preferably, the three second star point copper bars are distributed on the same end side of the stator winding in opposition to one first star point copper bar.

[0047] The outgoing lines of each phase winding are distributed in two adjacent stator slots, facilitating the concentration of outgoing lines. Moreover, the outgoing line and the star point line are equivalent to rotating 180° in the circumferential direction of the stator core, and the first star point copper bar and the second star point copper bar are symmetrically arranged with one diameter of the stator core as the symmetric axis. Therefore, the end part of the stator assembly is kept in structural balance and force balance.

[0048] Further, b rectangular conductors are arranged in each stator slot in the radial direction of the stator core, and b is an even number greater than or equal to 4. For the convenience of description, in the embodiment of the utility model, according to the direction from the outer circle side of the stator core to the inner circle side of the stator core, the rectangular conductors in the same stator slot are sequentially defined as No. 1 conductor, No. 2 conductor, …, No. b conductor, as shown in the figure. Figure 6

[0049] The connection mode of the stator winding at the welding end includes: adopting a single pitch mode; and the d number conductor in one stator slot is connected with the d+1 number conductor in another stator slot; wherein, 1≤d<b, and d is an odd number.

[0050] The connection mode of the stator winding at the welding end includes: adopting a single pitch mode; and the d number conductor in one stator slot is connected with the d+1 number conductor in another stator slot; wherein, 1≤d<b, and d is an odd number.

[0051] Specifically, the whole-pitch combination mode means that multiple span modes including whole-pitch are used at the same time; and the single whole-pitch mode means that only one whole-pitch span mode is used.

[0052] For example, when the number of slots per pole per phase Q = 2, the whole-pitch combination mode is: the combination span of 5, 6 and 7 is used at the same time; and the single whole-pitch mode is: only the span of 6 is used.

[0053] It should be noted that the two rectangular conductors in the slot winding are connected through the card end or the welding end, and the number of slots between the two rectangular conductors along the circumferential direction of the stator core is added by one, which represents the span of the two rectangular conductors at the card end or the welding end.

[0054] Specifically, the stator winding is composed of a plurality of minimum units E in series and / or parallel.

[0055] For example, a specific winding path of the minimum unit E is:

[0056] Z1(b)→Z8(b)→Z2(b-1)→Z8(b-2)→Z2(3)→Z8(2)→Z2(1)→Z8(1)→Z14(2)

[0057] ​→ Z8(3) → Z14(4) → Z8(b-1) → Z14(b) → Z19(b) → Z13(b-1) → Z19(b-2) → Z13(3) → Z19(2) → Z13(1) → Z19(1) → Z25(2) → Z19(3) → Z25(4) → Z19(b-1).

[0058] The winding connection scheme of the stator winding has the same number of elements for each branch of each phase winding, the same number of phase slots and layers passed by each branch, and basically realizes the same phase and size of counter electromotive force for each branch, the same resistance and inductance of the first and last ends of each branch, and balanced arrangement of the three-phase winding.

[0059] For example, a 96-slot 8-pole 6-layer 4-branch flat wire motor is taken as an example for illustration, that is, b = 6 rectangular conductors are arranged along the radial direction of the stator core in each stator slot; the number of slots per pole per phase Q = 4. The stator winding is divided into U phase, V phase and W phase, wherein the U phase winding is composed of four branches, which are divided into U1 branch, U2 branch, U3 branch and U4 branch, and each branch is composed of two minimum units E in series, and the specific winding path is as follows:

[0060] The winding path of the U1 branch is: Z1(1) → Z7(2) → Z1(3) → Z7(4) → Z1(5) → Z7(6) → Z14(6) → Z8(5) → Z14(4) → Z8(3) → Z14(2) → Z8(1) → Z14(1) → Z20(2) → Z14(3) → Z20(4) → Z14(5) → Z20(6) → Z25(6) → Z19(5) → Z25(4) → Z19(4) → Z25(3) → Z19(2) → Z25(1) → Z31(2) → Z25(3) → Z31(4) → Z25(5) → Z31(6) → Z38(6) → Z32(5) → Z38(4) → Z32(3) → Z38(2) → Z32(1) → Z38(1) → Z44(2) → Z38(3) → Z44(4) → Z38(5) → Z44(6) → Z49(6) → Z43(5) → Z49(4) → Z43(3) → Z49(2) → Z43(1).

[0061] The winding path for the U2 leg is: Z2(1) -> Z8(2) -> Z2(3) -> Z8(4) -> Z2(5) -> Z8(6) -> Z13(6) -> Z7(5) -> Z13(4) -> Z7(3) -> Z13(2) -> Z7(1) -> Z13(1) -> Z19(2) -> Z13(3) -> Z19(4) -> Z13(5) -> Z19(6) -> Z26(6) -> Z20(5) -> Z26(4) -> Z20(4) -> Z26(3) -> Z20(2) -> Z26(1) -> Z32(2) -> Z26(3) -> Z32(4) -> Z26(5) -> Z32(6) -> Z37(6) -> Z31(5) -> Z37(4) -> Z31(3) -> Z37(2) -> Z31(1) -> Z37(1) -> Z43(2) -> Z37(3) -> Z43(4) -> Z37(5) -> Z43(6) -> Z50(6) -> Z44(5) -> Z50(4) -> Z44(3) -> Z50(2) -> Z44(1).

[0062] The winding path for the U3 leg is: Z1(6) -> Z91(5) -> Z1(4) -> Z91(3) -> Z1(2) -> Z91(1) -> Z85(1) -> Z91(2) -> Z85(3) -> Z91(4) -> Z85(5) -> Z91(6) -> Z86(6) -> Z80(5) -> Z86(4) -> Z80(3) -> Z86(2) -> Z80(1) -> Z74(1) -> Z80(2) -> Z74(3) -> Z80(4) -> Z74(5) -> Z80(6) -> Z73(6) -> Z67(5) -> Z73(4) -> Z67(3) -> Z73(2) -> Z67(1) -> Z61(1) -> Z67(2) -> Z61(3) -> Z67(4) -> Z61(5) -> Z67(6) -> Z62(6) -> Z56(5) -> Z62(4) -> Z56(3) -> Z62(2) -> Z56(1) -> Z50(1) -> Z56(2) -> Z50(3) -> Z56(4) -> Z50(5) -> Z56(6).

[0063] The winding path of the U4 branch is: Z2(6)→Z92(5)→Z2(4)→Z92(3)→Z1(2)→Z92(1)→Z86(1)→Z92(2)→Z86(3)→Z92(4)→Z86(5)→Z92(6)→Z85(6)→Z79(5)→Z85(4)→Z79(3)→Z85(2)→Z79(1)→Z73(1)→Z79(2)→Z73(3)→Z79(4)→Z73(5)→Z79(6)→Z74(6)→Z68(5)→Z74(4)→Z68(3)→Z74(2)→Z68(1)→Z62(1)→Z68(2)→Z62(3)→Z68(4)→Z62(5)→Z68(6)→Z61(6)→Z55(5)→Z61(4)→Z55(3)→Z61(2)→Z55(1)→Z49(1)→Z55(2)→Z49(3)→Z55(4)→Z49(5)→Z55(6).

[0064] Therefore, each branch is composed of two minimum units E in series, and the phase windings are completely balanced. There are six wires in each stator slot, and the outgoing wires of the U1, U2, U3 and U4 branches can be concentrated in the same pole; the star point wires of the U1, U2, U3 and U4 branches can be concentrated between three poles. The V-phase and W-phase windings have the same winding rule as the U-phase winding, and are symmetrically and uniformly distributed on the stator, which will not be illustrated here.

[0065] The motor scheme provided by the utility model not only realizes balanced arrangement of the circuit of the three-phase winding, but also realizes concentrated outgoing wires by controlling the outgoing wire positions of the branches. In addition, the outgoing wires or star point wires are connected on both sides of each star point copper bar, so that the overall stress of the star point copper bar is balanced, and the overall structural stability and balance of the motor are improved.

[0066] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced equivalently, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A structurally balanced stator assembly, characterized in that: The stator assembly includes a stator core, a stator winding and a star point copper bar group; the stator winding is wound on the stator core; The stator winding is a three-phase winding, and the number of branches of each phase winding is an even number; The star point copper bar group includes a first star point copper bar and three second star point copper bars; The first star point copper bar and the second star point copper bar are respectively installed on the same end side of the stator winding; The first star point copper busbar includes a first body and a plurality of first connecting terminals; the first body is a substantially planar plate having an axis bent; half of the first connecting terminals are arranged on the inner circumference of the first body; and the other half of the first connecting terminals are arranged on the outer circumference of the first body; Each second star point copper busbar includes a second body, a plurality of second connecting terminals and an external large terminal; the second body is roughly a flat plate with an axis bent; half of the second connecting terminals are arranged on the inner circle side of the second body; the other half of the second connecting terminals are arranged on the outer circle side of the second body; the external large terminal is arranged on one side of the second body.

2. A structurally balanced stator assembly according to claim 1, characterized in that: The number of branches of each phase winding is 4; Half of the star point lines of the stator winding are distributed in the layer closest to the inner circle of the stator core in the stator slots, and are respectively connected to the first connection terminals on the inner circle of the first star point copper bar; the other half of the star point lines of the stator winding are distributed in the layer closest to the outer circle of the stator core in the stator slots, and are respectively connected to the first connection terminals on the outer circle of the first star point copper bar; The lead wires of the four branches of the same phase winding are distributed in two adjacent stator slots and are respectively connected to the second connection terminals on a second star-point copper bar. Among them, the lead wires of two branches are respectively located in the layer closest to the inner circle of the stator core in the two stator slots, and are respectively connected to the second connection terminals on the inner circle of the second star-point copper bar. The lead wires of the other two branches are respectively located in the layer closest to the outer circle of the stator core in the two stator slots, and are respectively connected to the second connection terminals on the outer circle of the second star-point copper bar.

3. The structurally balanced stator assembly according to claim 1, characterized in that: The number of slots per pole and per phase of the stator winding is Q ≥ 2, and the number of poles P is an integer multiple of 8; The three second star-point copper bars are arranged in sequence along the circumference of the stator core, and any two adjacent second star-point copper bars are separated by Q stator slots.

4. A structurally balanced stator assembly according to claim 3, characterized in that: The three second star-point copper bars are integrally distributed on the same end side of the stator winding opposite to the one first star-point copper bar.

5. The structurally balanced stator assembly according to claim 3, characterized in that: Each stator slot is provided with b rectangular conductors arranged radially along the stator core, where b is an even number greater than or equal to 4.

6. A structurally balanced stator assembly according to claim 5, characterized in that: The stator winding connection method at the hairpin end includes: using a full-pitch combination method; the No. 1 wire in one stator slot is connected to the No. 1 wire in another stator slot; the No. c wire in one stator slot is connected to the No. c+1 wire in another stator slot; the No. b wire in one stator slot is connected to the No. b wire in another stator slot; wherein 2≤c<b, and c is an even number; The stator winding connection method at the welding end includes: using a single full pitch method; and connecting the d-number wire in one stator slot to the d+1-number wire in another stator slot; wherein 1≤d<b, and d is an odd number.

7. A structurally balanced stator assembly according to claim 6, characterized in that: When the number of slots per pole per phase Q=2, the full-spacing combination mode is: using a combination of spans of 5, 6 and 7 at the same time; the single full-spacing mode is: using only a span of 6.

8. A structurally balanced motor, characterized in that: The motor comprises the stator assembly according to any one of claims 1 to 7.

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