Stator unit with rectangular wire segment shoot winding

Abstract

The present invention relates to a stator unit with a rectangular wire segment shoot winding, comprising a stator core and a rectangular wire winding inserted into the stator core, the stator core being multi-segment, with adjacent stator cores fixed by connecting members, the rectangular wire winding including a plurality of rectangular wire conductors, each twisted in the same direction by the connecting members so that the upper and lower portions of the rectangular wire conductors are misaligned with each other. In this invention, by installing a twist in the middle of the rectangular wire conductor, any angle of skew can be realized for the rectangular wire motor stator. Compared to a simple rotor segment skew, the skew method in which the stator and rotor cooperate with each other can better solve the NVH problems of the motor.

Description

[Technical Field]

[0001] This application claims priority to a Chinese patent application filed with the China Patent Office on September 21, 2022, bearing application number 202211150803.6 and entitled "Stator unit with flat wire segment shoot winding," the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to the technical field of permanent magnet synchronous drive motors for new energy vehicles, and more particularly to a stator unit with rectangular wire segment shoot windings. [Background technology]

[0003] With the rapid spread of new energy electric vehicles, permanent magnet synchronous motors have become the new energy drive motors with the widest range of applications. Quietness is one of the features of electric vehicles, and the electromagnetic noise of the drive motor is one of the main sources of the noise of the entire vehicle. As consumers' living standards improve, they are increasingly concerned about the comfort of their vehicles. Therefore, NVH (Noise, Vibration, Harshness) is receiving increasing attention from research and development personnel. In addition, rectangular wire motors with higher efficiency are increasingly being applied to the new energy drive motor industry. One of the methods to effectively solve NVH problems is motor skew, which can be divided into stator skew and rotor skew, and can be distinguished into continuous skew and segment skew. Rotors generally adopt segmental skew, and the stators of round wire motors have little or no continuous skew, whereas the stators of rectangular wire motors generally do not skew due to process and other reasons.

[0004] Additionally, heat dissipation issues at the motor winding ends and rotors (especially the rotor midsection) have always been a problem for the industry. At the same time, oil cooling technology has been increasingly applied to motor cooling. Conventional oil cooling technology is generally realized by oil injection or oil dripping at the end, which requires separate equipment to be placed at the end, making the entire structure complicated and increasing costs. Summary of the Invention [Problem to be solved by the invention]

[0005] In order to solve the above technical problems, the present invention aims to provide a stator unit with a simple structure and rectangular wire segment shoot winding, which can realize stator skew and cool the rotor middle part and winding end part. [Means for solving the problem]

[0006] In order to achieve the object of the present invention, the present invention is as follows. A stator unit consisting of a stator core and a flat wire segment shoot winding including a flat wire winding inserted into the stator core, wherein the stator core is multi-segment and adjacent stator cores are fixed by connecting members, the flat wire winding includes a plurality of flat wire conductors, and each flat wire conductor is twisted in the same direction by the connecting members so that the upper and lower parts of the flat wire conductor are misaligned with each other.

[0007] The stator core preferably has two segments, including a first segment core and a second segment core fixed by a connecting member.

[0008] It is preferable that the flat wire conductor includes a first straight segment, a bent segment and a second straight segment, the first straight segment and the second straight segment are inserted into a first segment core and a second segment core, respectively, and the bent segment is located inside the connecting member.

[0009] The connecting member is preferably annular, and has an oil guide annular groove formed on its outer wall.

[0010] Preferably, a plurality of radial oil guide holes are provided in the bottom of the annular oil guide groove, and the plurality of radial oil guide holes are distributed at equal intervals around the circumference.

[0011] It is preferable that an axial oil guide hole is provided on each side wall of the annular oil guide groove, and that the stator core is also provided with a cooling pipe line communicating with the axial oil guide hole.

[0012] Preferably, the axial oil guide holes are also plural, the number of which is the same as the number of cooling ducts, and the plural axial oil guide holes are distributed equidistantly spaced apart around the circumference. [Effects of the Invention]

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: In this invention, by installing a twist in the middle part of the rectangular wire conductor, it is possible to realize any angle of skew of the stator of the rectangular wire motor. Compared to simple rotor segment skew, the skew method in which the stator and rotor cooperate with each other can better solve the NVH problems of the motor. [Brief explanation of the drawings]

[0014] The drawings in the specification, which form a part of this application, provide a further understanding of the invention, and the examples and descriptions thereof are intended to illustrate the invention rather than to limit it. [Figure 1] 1 is a structural diagram showing the entire present invention; [Figure 2] 1 is a diagram showing the overall structure of a connecting member according to the present invention; [Figure 3] FIG. 2 is a structural diagram of the flat wire conductor of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] The following detailed description is now provided as an example only and provides further explanation of the present invention. All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art.

[0016] The terminology used herein does not limit the embodiments according to the present invention, but is merely for describing specific embodiments. Unless the specification clearly indicates otherwise, the singular forms used herein are intended to include the plural forms as well, and the use of the terms "comprises" and / or "comprises" herein indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0017] Furthermore, in describing the present invention, the orientations or positional relationships indicated by the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise" are orientations or positional relationships according to the drawings, and do not indicate or imply that the indicated devices or elements must have a specific orientation, be configured and operated in a specific orientation, and are merely intended to conveniently describe the present invention and simplify the description, and should not be considered to limit the present invention.

[0018] Furthermore, the terms "first," "second," etc. are for purpose only and do not indicate or imply relative importance or the number of technical features indicated. Thus, a feature qualified with "first" or "second" explicitly or implicitly includes one or more of those features. In the present description, unless otherwise specified, "plurality" means two or more than two.

[0019] In the present invention, unless otherwise clearly specified and limited, the terms "attached," "coupled," "connected," "fixed," etc. should be understood in a broad sense, and may mean, for example, a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, or even internal communication between two elements. Those skilled in the art can understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0020] In the present invention, unless otherwise clearly specified and limited, a first feature being located "above" or "below" a second feature may include a direct contact between the first feature and the second feature, or a contact between the first feature and the second feature that is not in direct contact but is made by another feature therebetween. Furthermore, the positioning of a first feature "above," "above," and "above the side" of a second feature includes the positioning of the first feature directly above and diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than that of the second feature. The positioning of a first feature "below," "below," and "below side" of a second feature includes the first feature being directly below and diagonally below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.

[0021] The present invention will be further described below with reference to the drawings and examples.

[0022] As shown in Figure 1, the stator unit is made up of a stator core and a flat wire segment shoot winding including a flat wire winding inserted into the stator core. The stator core is multi-segment, and adjacent stator cores are fixed by connecting members 3. The flat wire winding includes a plurality of flat wire conductors 4, and each flat wire conductor 4 is twisted in the same direction by the connecting members 3 so that the upper and lower parts of the flat wire conductor 4 are misaligned with each other.

[0023] The stator core is a two-segment core, and includes a first segment core 1 and a second segment core 2 fixed by a connecting member 3.

[0024] As shown in FIG. 3, the rectangular wire conductor 4 includes a first straight segment 41, a bent segment 42 and a second straight segment 43. The first straight segment 41 and the second straight segment 43 are inserted into the first segment core 1 and the second segment core 2, respectively, and the bent segment 42 is located inside the connecting member 3. The flat wire conductor is twisted at the midpoint of the two-segment core to form the bent segment 42. The flat wire conductor may be inserted into a one-segment core and then twisted (applicable to HairPin-IPin and Ipin-IPin), or may be twisted and shaped before being inserted into the core. The flat wire conductor of the present invention is not limited to the end connection portion and can meet all connection forms of the end of a flat wire motor.

[0025] The connecting member 3 is annular, and has an oil guide annular groove 33 formed on its outer wall. A plurality of radial oil guide holes 32 are provided at the bottom of the annular oil guide groove 33, and the radial oil guide holes 32 are distributed at equal intervals along the circumference. An axial oil guide hole 31 is provided on each side wall of the oil guide annular groove 33, and a cooling pipe line communicating with the axial oil guide hole 31 is also provided in the stator core. The axial oil guide holes 31 are also plural, and the number thereof is the same as the number of cooling pipes, and the plural axial oil guide holes 31 are distributed at equal intervals along the circumference.

[0026] In the present invention, an oil guide annular groove is provided at the skew space position designed above to connect and fix the segment stator core, and cooling oil effectively cools the stator end and rotor middle portion through oil guide holes distributed along the radial and axial directions. In the present invention, the flow resistance of each oil passage is combined and the oil guide annular groove and oil guide holes are designed respectively to control the flow rate through each oil guide hole, resulting in good cooling effect for both the stator end and the rotor.

[0027] As described above, in the present invention, the overall twist of the rectangular wire winding is utilized to achieve segment skew of the stator in accordance with the rotation of the stator core, and the oil guide annular groove is arranged, the rotor is cooled by the radial oil guide holes, and the stator ends are cooled by the axial oil guide holes and the oil guide holes on the stator core.

[0028] In the description of this specification, the use of terms such as "one embodiment," "some embodiments," "examples," "particular examples," or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the appearance of the above terms does not necessarily refer to similar embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0029] Although the embodiments of the present invention have been described above, the above embodiments are merely examples and are not limiting. The above embodiments may be modified, amended, substituted, and altered within the scope of the present invention without departing from the spirit and intent of the present invention, and any simple amendments, equivalent changes, and modifications to the above embodiments based on the present invention are all included within the scope of the present invention. [Explanation of symbols]

[0030] 1. First segment core 2. Second segment core 3. Connection parts 4. Flat wire conductor 31 Axial oil guide hole 32 Radial oil guide hole 33 Oil guide annular groove 41... First straight line segment 42...Bent segment 43...Second straight line segment.

Claims

1. A stator unit using a rectangular wire segment shoot winding including a stator core and a rectangular wire winding inserted into the stator core, The stator core is multi-segment, Adjacent stator cores are fixed by connecting members (3), The flat wire winding includes a plurality of flat wire conductors (4), The stator unit with the flat wire segment chute winding is characterized in that each of the flat wire conductors (4) is twisted in the same direction by the connecting member (3) so that the upper and lower parts of the flat wire conductor (4) are misaligned with each other.

2. 2. A stator unit with a rectangular wire segment shoot winding as described in claim 1, characterized in that the stator core is two segments, including a first segment core (1) and a second segment core (2) fixed by the connecting member (3).

3. The flat wire conductor (4) includes a first straight segment (41), a bent segment (42) and a second straight segment (43), The first straight segment (41) and the second straight segment (43) are inserted into the first segment core (1) and the second segment core (2), respectively; 3. The stator unit with a rectangular wire segment shoot winding as claimed in claim 2, wherein the bent segment (42) is located inside the connecting member (3).

4. 2. A stator unit with rectangular wire segment chute windings according to claim 1, wherein the connecting member (3) is annular and has an oil guide annular groove (33) on its outer wall.

5. A plurality of radial oil guide holes (32) are provided at the bottom of the oil guide annular groove (33), 5. The stator unit with rectangular wire segment chute winding as claimed in claim 4, wherein the plurality of radial oil guide holes (32) are distributed at equal intervals along the circumference.

6. Axial oil guide holes (31) are provided on both side walls of the oil guide annular groove (33), 5. A stator unit with rectangular wire segment chute windings according to claim 4, characterized in that the stator core is also provided with a cooling pipe line communicating with the axial oil guide hole (31).

7. The axial oil guide holes (31) are also plural, The number of the axial oil guide holes (31) is the same as the number of the cooling pipes, 7. The stator unit with rectangular wire segment chute winding as claimed in claim 6, wherein the plurality of axial oil guide holes (31) are distributed at equal intervals along the circumference.

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