A stator winding, a motor stator, and a motor

Abstract

This invention provides a stator winding, a motor stator, and a motor. The stator core has an even number of slot layers M. The first coil group and the second coil group include a first conductor and a second conductor. The slot spacing between the two welded ends of the first conductor is a long spacing L, and the slot spacing between the two welded ends of the second conductor is a short spacing S. The first coil group and the second coil group are respectively wound sequentially through all the layers of the stator core, ensuring the relative potential balance of each coil branch in the stator. The first conductor and the second conductor in the first coil group and the second coil group are staggered. The long spacing of the first coil group corresponds to the short spacing of the second coil group, and the short spacing of the first coil group corresponds to the long spacing of the second coil group, ensuring the potential symmetry between the first coil group and the second coil group. The slot spacing between adjacent first conductors and second conductors is an integer spacing, making the winding leads neat.

Description

Technical Field

[0001] This invention relates to the field of motor stator winding technology, and more particularly to a stator winding, a motor stator, and a motor. Background Technology

[0002] In existing technologies, stator windings include various types of conductor coils. These coils are arranged in a specific pattern and inserted into slots in the stator core to form the required windings for single-phase or multi-phase motors. Existing technologies use a wide variety of irregularly shaped hairpin coils with complex arrangements, requiring numerous busbars and busbars to connect the branches and neutral point of each phase winding. This results in complex manufacturing processes, high production costs, and low processing efficiency.

[0003] Furthermore, existing winding methods often suffer from some degree of potential imbalance, which affects the performance of the motor. Summary of the Invention

[0004] In order to overcome the above-mentioned technical defects, the purpose of this invention is to provide a stator winding, a motor stator, and a motor with balanced potential and neat winding leads.

[0005] This invention discloses a stator winding, including a first coil group and a second coil group. The first coil group and the second coil group are arranged in the same layer and adjacent slots, and the first coil group and the second coil group are respectively wound through all the slot layers of the stator core. The first coil group and the second coil group include a first conductor and a second conductor. The slot spacing between the two welded ends of the first conductor is a long spacing L, and the slot spacing between the two welded ends of the second conductor is a short spacing S. The number of slot layers M of the stator core is even, and two adjacent slot layers of the stator core form a single layer group. The stator core includes... Each layer group; the two welded ends of the first conductor and the second conductor respectively pass through the two slots of the same layer group, and adjacent layers are connected by the first conductor or the second conductor, so that the first coil group and the second coil group are respectively wound around all the layers of the stator core in sequence.

[0006] Preferably, the first conductor and the second conductor in the first coil group and the second coil group are arranged alternately.

[0007] Preferably, the welding end of the first conductor is connected to the welding end of the adjacent second conductor to form a conductor group. Several conductor groups are connected to form a first coil group and a second coil group. Each conductor group in the first coil group corresponds to a conductor group in the second coil group according to the slot number. The first conductor in the first coil group corresponds to the second conductor in the corresponding conductor group in the second coil group, and the second conductor in the first coil group corresponds to the first conductor in the corresponding conductor group in the second coil group.

[0008] Preferably, the slot spacing between adjacent first conductors and second conductors is a whole number R.

[0009] Preferably, the first coil group includes a first branch and a third branch, and the second coil group includes a second branch and a fourth branch; the first branch and the second branch are arranged in the same layer and adjacent slots, and the third branch and the fourth branch are arranged in the same layer and adjacent slots; the first branch, the second branch, the third branch and the fourth branch are respectively wound around all the layers of the stator core in sequence.

[0010] Preferably, the first branch and the third branch are connected in series via a first conductor or a second conductor; the second branch and the fourth branch are connected in series via a first conductor or a second conductor.

[0011] Preferably, the long distance L is 7, the short distance S is 5, and the whole distance R is 6.

[0012] Preferably, the stator core has 8 slot layers M.

[0013] The present invention also discloses a motor stator, including the stator windings described above.

[0014] The present invention also discloses an electric motor, including the stator windings described above.

[0015] Compared with existing technologies, the above technical solution has the following advantages:

[0016] 1. The winding method of the present invention allows the first coil group and the second coil group to be wound sequentially through all the layers of the stator core. Compared with the prior art, where some coil branches are only wound through some layers (while other coil branches are wound through other layers), this method ensures that the potential of each coil branch in the stator is relatively balanced, and makes the transient response of the motor symmetrical.

[0017] 2. The first coil group and the second coil group adopt a long-short pitch, and the long pitch of the first coil group corresponds to the short pitch of the second coil group, and the short pitch of the first coil group corresponds to the long pitch of the second coil group, which ensures the potential symmetry between the first coil group and the second coil group;

[0018] 3. The slot spacing between adjacent first conductors and second conductors is set to a full pitch R, which makes the winding output ends neat, reduces and simplifies the twisting process, saves production cycle and mold costs, and facilitates connection with other devices (such as copper busbars).

[0019] 4. Compatible with variations in winding connection schemes on the same platform, such as a star connection with four branches in parallel and a delta connection with two branches in parallel. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the stator structure provided by the present invention;

[0021] Figure 2 This is a schematic diagram of the stator core structure provided by the present invention;

[0022] Figure 3 A schematic diagram of the structure of the slot conductor of the stator core provided by the present invention;

[0023] Figure 4 A schematic diagram of a portion of the winding structure of the first branch in a preferred embodiment of the present invention;

[0024] Figure 5 A schematic diagram of a portion of the winding structure of the second branch in a preferred embodiment of the present invention;

[0025] Figure 6 A schematic diagram of a portion of the winding structure of the third branch in a preferred embodiment of the present invention;

[0026] Figure 7 A schematic diagram of a portion of the winding structure of the fourth branch in a preferred embodiment of the present invention;

[0027] Figure 8 Circuit diagram of a four-branch parallel star connection provided for some embodiments of the present invention;

[0028] Figure 9 The circuit diagram for a delta connection of two parallel branches provided for some embodiments of the present invention. Detailed Implementation

[0029] The advantages of the present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments.

[0030] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0031] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0032] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0033] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] In the description of this invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0035] In the following description, suffixes such as "module," "part," or "unit" used to denote elements are used only for the convenience of the description of the invention and have no specific meaning in themselves. Therefore, "module" and "part" can be used interchangeably.

[0036] See appendix Figure 1-3 The stator includes a stator core and windings. The stator core has slots arranged circumferentially to form a slot layer. The windings are wound through these slots and thus within the stator core. Each winding includes several U-shaped conductors. The open ends of these U-shaped conductors can be called hairpin ends or welding ends. The two welding ends are inserted into different slots in the stator core, and the two U-shaped conductors are connected by welding at these ends, thus forming the windings within the stator core.

[0037] Different structures and arrangements of conductors result in various winding methods. For example, the span between the two welded ends of a conductor (referring to the number of slots spanned between the two welded ends) can be different, the span between two adjacent conductors can be different, the two welded ends of a conductor can be placed in slots of the same layer, or the two welded ends of a conductor can be placed in slots of different layers, etc.

[0038] This invention discloses a stator winding applied to an even-numbered slot layer M of a stator core, comprising a first coil group and a second coil group. The first and second coil groups are arranged in the same layer and adjacent slots, and are wound through all slot layers of the stator core. For example, in the preferred embodiment of the 8-slot winding provided by this invention, both the first and second coil groups are wound through 8 slot layers. Compared to the prior art scheme where the first coil group is wound through 1-4 slot layers and the second coil group is wound through 5-8 slot layers, the potentials of the first and second coil groups of this invention are relatively balanced.

[0039] The first coil group and the second coil group include two conductors with different spans. The span between the two welded ends of the first conductor is the long span L, and the span between the two welded ends of the second conductor is the short span S.

[0040] If two adjacent slots in an even-numbered stator core are grouped into one layer, then the stator core includes... Each coil group has two welded ends, one for each layer, passing through two slots within the same layer group. When moving from one layer group to another, the coils connect via either the first or second conductor. Thus, the first and second coil groups sequentially wind through all the layers of the stator core. "Sequentially" here refers to the coils winding from the inside out or from the outside in, further ensuring a relatively symmetrical potential across each branch.

[0041] For example, in the preferred embodiment of the 8-slot design provided by this invention, four layer groups are included, tentatively defined as follows: the outermost layer is the first layer group (i.e., the first and second slots), and the innermost layer is the fourth layer group (i.e., the seventh and eighth slots). The first coil group and the second coil group are wound sequentially through the first layer group, the second layer group, the third layer group, and the fourth layer group, respectively. That is, the first coil group and the second coil group are wound sequentially through the first and second slots, then through the third and fourth slots, then through the fifth and sixth slots, and finally through the seventh and eighth slots. Alternatively, the direction may be reversed as described above, which will not be elaborated here.

[0042] Furthermore, the first and second conductors within the first coil group and the second coil group are arranged alternately. That is, the long and short distances are alternated within the same branch, rather than being continuous long distances or continuous short distances.

[0043] Furthermore, in the case where the first and second conductors are arranged alternately, the welded end of the first conductor is connected to the welded end of the adjacent second conductor to form a conductor group. That is, a long-pitch conductor and a short-pitch conductor together form a conductor group. Several conductor groups are connected to form a first coil group and a second coil group. Each conductor group in the first coil group corresponds to a conductor group in the second coil group according to the slot number. The first conductor in the first coil group corresponds to the second conductor in the corresponding conductor group in the second coil group, and vice versa. That is, the long pitch in the first coil group corresponds to the short pitch in the second coil group, and the short pitch in the first coil group corresponds to the long pitch in the second coil group, thereby making the potential symmetrical between the first branch and the second branch.

[0044] Furthermore, the slot spacing between adjacent first and second conductors is a whole number R. With the above settings, by setting the slot spacing between adjacent first and second conductors to a full spacing, that is, the slot spacing between the two welding ends used to connect the first and second conductors is a full spacing, the welding end wires can be neatly arranged, and all of them are full spacing R.

[0045] For example, in the preferred embodiment of the 8-layer slot provided by the present invention, the slot spacing between the first conductor and the second conductor (between the two welding ends for connecting the first conductor and the second conductor) is 6, so that the spacing between the outlet ends (conductor welding ends) is 6, resulting in a neat appearance and facilitating connection with the copper busbar for cable outlet.

[0046] In a preferred embodiment, the long spacing L is 7, the short spacing S is 5, and the full spacing R is 6. This results in a slot pitch of 7-6-5 or 5-6-7 in a conductor group.

[0047] Furthermore, in a preferred embodiment of the present invention, four winding branches are included. Specifically, the first coil group includes a first branch and a third branch, and the second coil group includes a second branch and a fourth branch. The first branch and the second branch are arranged in the same layer and adjacent slots, and the third branch and the fourth branch are arranged in the same layer and adjacent slots. The first branch, the second branch, the third branch, and the fourth branch are respectively wound through all layers of the stator core in sequence.

[0048] In other preferred embodiments, only two winding branches may be provided. Specifically, the first branch and the third branch are connected in series by a first conductor or a second conductor; the second branch and the fourth branch are connected in series by a first conductor or a second conductor.

[0049] The following is a preferred embodiment of the winding arrangement of the four branches. The stator has 48 slots, and each slot has 8 layers of flat enameled wire. The number of layers in the stator slot is 1 to 8 from the outside to the inside. The number in parentheses represents the number of the conductor layer in the stator slot, and the number outside the parentheses represents the serial number of the stator slot where the conductor segment is located (48 in total). For example, 13(2) indicates the position of the 2nd conductor layer in the 13th slot. The following arrangement takes the U-phase lap winding as an example. The V and W phases are similar to the U phase and will not be described in detail here.

[0050] See appendix Figure 4 The first branch road starts from Figure 1 The first branch is connected in series through the following slots: 1(1)→43(2)→38(1)→32(2)→25(1)→19(2)→14(1)→8(2)→1(3)→43(4)→38(3)→32(4)→25(3)→19(4)→14(3)→8(4)→1(5)→43(6)→38(5)→32(6)→25(5)→19(6)→14(5)→8(6)→1(7)→43(8)→38(7)→32(8)→25(7)→19(8)→14(7)→8(8).

[0051] See appendix Figure 5 The second branch road starts from Figure 2The second branch is connected in series through the following slots: 2(1)→44(2)→37(1)→31(2)→26(1)→20(2)→13(1)→7(2)→2(3)→44(4)→37(3)→31(4)→26(3)→20(4)→13(3)→7(4)→2(5)→44(6)→37(5)→31(6)→26(5)→20(6)→13(5)→7(6)→2(7)→44(8)→37(7)→31(8)→26(7)→20(8)→13(7)→7(8).

[0052] See appendix Figure 6 The third branch road from Figure 3 The circuit goes around to position A3 and finally outputs from position X3. A3 corresponds to 1(2) and X3 corresponds to 44(7). The slot numbers that the third branch passes through in series are: 1(2)→7(1)→14(2)→20(1)→25(2)→31(1)→38(2)→44(1)→1(4)→7(3)→14(4)→20(3)→25(4)→31(3)→38(4)→44(3)→1(6)→7(5)→14(6)→20(5)→25(6)→31(5)→38(6)→44(5)→1(8)→7(7)→14(8)→20(7)→25(8)→31(7)→38(8)→44(7).

[0053] See appendix Figure 7 The fourth branch road starts from Figure 4 The circuit goes around to position A4 and finally outputs from position X4. A4 corresponds to 2(2) and X4 corresponds to 43(7). The slot numbers that the fourth branch passes through in series are: 2(2)→8(1)→13(2)→19(1)→26(2)→32(1)→37(2)→43(1)→2(4)→8(3)→13(4)→19(3)→26(4)→32(3)→37(4)→43(3)→2(6)→8(5)→13(6)→19(5)→26(6)→32(5)→37(6)→43(5)→2(8)→8(7)→13(8)→19(7)→26(8)→32(7)→37(8)→43(7).

[0054] In the first branch, 43(2)→38(1)→32(2)→25(1) is a conductor group, 43(2)→38(1) is the groove through which a short-distance conductor passes, 32(2)→25(1) is the groove through which a long-distance conductor passes, and 38(1)→32(2) is the span between the welded ends of the two conductors.

[0055] In the second branch, 44(2)→37(1)→31(2)→26(1) is a conductor group, 44(2)→37(1) is the groove through which a long-distance conductor passes, 31(2)→26(1) is the groove through which a short-distance conductor passes, and 37(1)→31(2) is the span between the welded ends of the two conductors.

[0056] The first branch 43(2)→38(1)→32(2)→25(1) corresponds to the second branch 44(2)→37(1)→31(2)→26(1), forming a corresponding conductor group. In this corresponding conductor group, the short-pitch conductor of the first branch 43(2)→38(1) corresponds to the long-pitch conductor of the second branch 44(2)→37(1); the long-pitch conductor of the first branch 32(2)→25(1) corresponds to the short-pitch conductor of the second branch 31(2)→26(1), thus making the potential symmetrical between the first branch and the second branch.

[0057] Compared to the third branch, in the same tank, the first branch runs through layers 1, 3, 5, and 7, while the third branch runs through layers 2, 4, 6, and 8. The first and third branches are arranged in an alternating pattern to ensure that the number of layers in the tank used by different branches is symmetrical. Compared to the first branch running through layers 1, 2, 3, and 4, and the third branch running through layers 5, 6, 7, and 8, the potential between the first and third branches is also symmetrical.

[0058] Compared to the fourth branch, the second branch runs through layers 1, 3, 5, and 7 in the same slot, while the fourth branch runs through layers 2, 4, 6, and 8. The second and fourth branches are arranged in an alternating pattern to ensure that the number of layers in the slot used by different branches is symmetrical, so that the potential between the second and fourth branches is also symmetrical.

[0059] This achieves complete symmetry of the entire winding.

[0060] When the four branches are connected in a star configuration, U1, U2, U3, and U4 are connected in parallel, and X1, X2, X3, and X4 are connected in parallel. Finally, they are connected through a common busbar to form the complete U-phase winding. See Appendix. Figure 8 The circuit schematic.

[0061] When the connection is a triangle with two parallel branches, the four branches are changed to two branches. That is, U1→X1→U3→X3 is the first branch of phase U, and U2→X2→U4→X4 is the second branch of phase U. See appendix. Figure 9 The circuit schematic.

[0062] The present invention also discloses a motor stator, including the stator windings described above.

[0063] The present invention also discloses an electric motor, including the stator windings described above.

[0064] It should be noted that the embodiments of the present invention have better implementability and are not intended to limit the present invention in any way. Any person skilled in the art may use the above-disclosed technical content to change or modify it into equivalent effective embodiments. However, any modifications or equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A stator winding applied to the slot layer of a stator core. An even number of motor electronics is characterized by, It includes a first coil group and a second coil group, which are arranged in the same layer and adjacent slots, and the first coil group and the second coil group are respectively wound through all the slot layers of the stator core; Both the first coil group and the second coil group include a first conductor and a second conductor, and the slot spacing between the two welded ends of the first conductor is the long distance. The slot spacing between the two welded ends of the second conductor is the shorter spacing. ; The slot layer of the stator core If the number is even, two adjacent slots of the stator core form a group, and the stator core includes... Each layer group; The two welded ends of the first conductor and the second conductor respectively pass through the two slots of the same layer group, and adjacent two layers groups are connected by the first conductor or the second conductor, so that the first coil group and the second coil group are respectively wound around all the layers of the stator core in sequence.

2. The stator winding according to claim 1, characterized in that, The first conductor and the second conductor in the first coil group and the second coil group are arranged alternately.

3. The stator winding according to claim 2, characterized in that, The welding end of the first conductor is connected to the welding end of the adjacent second conductor to form a conductor group. Several conductor groups are connected to form the first coil group and the second coil group. Each conductor group in the first coil group corresponds to a conductor group in the second coil group according to the slot number. The first conductor in the first coil group corresponds to the second conductor in the corresponding conductor group in the second coil group, and the second conductor in the first coil group corresponds to the first conductor in the corresponding conductor group in the second coil group.

4. The stator winding according to claim 1 or 3, characterized in that, The slot spacing between adjacent first and second conductors is a whole pitch. , .

5. The stator winding according to claim 1, characterized in that, The first coil group includes a first branch and a third branch, and the second coil group includes a second branch and a fourth branch; The first branch and the second branch are arranged on the same floor and in adjacent slots, and the third branch and the fourth branch are arranged on the same floor and in adjacent slots. The first branch, the second branch, the third branch, and the fourth branch respectively pass through all the layers of the stator core in sequence.

6. The stator winding according to claim 5, characterized in that, The first branch and the third branch are connected in series by a first conductor or a second conductor; The second branch and the fourth branch are connected in series via the first conductor or the second conductor.

7. The stator winding according to claim 4, characterized in that, The long distance The short distance is 7. The whole distance is 5. It is 6.

8. The stator winding according to claim 7, characterized in that, The slot layer of the stator core It has 8 floors.

9. An electric motor stator comprising the stator winding as described in any one of claims 1-8.

10. An electric motor comprising the stator winding as described in any one of claims 1-8.

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