A new energy vehicle motor stator structure and motor

Abstract

The application relates to the technical field of motors, and discloses a motor stator structure for a new energy vehicle and a motor. The stator structure comprises a stator yoke part and a stator tooth part. A plurality of stator tooth parts are arranged on the inner side of the stator yoke part in the circumferential direction, and a stator slot is defined between each two adjacent stator tooth parts. A stress relieving hole is arranged at the position opposite to each stator slot on the stator yoke part, so that most of the stress borne by the stator structure is concentrated on the rear yoke part of the stator yoke part, the influence of the pressure generated when the shell is pressed on the stator core material is reduced, and the motor loss is reduced. The first groove and the second groove are arranged on the outer circular edge of the stator structure, the contact area of the outer circular surface of the stator structure and the shell is reduced, the stress generated when the interference assembly is performed is reduced, and the motor loss is reduced. The stator structure can effectively relieve the assembly stress, reduce the motor loss, improve the motor efficiency, has a simple structure, is easy to process, and has low manufacturing cost.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a stator structure and motor for a new energy vehicle. Background Technology

[0002] In existing motor stator and housing assembly, the outer circle of the stator is connected to the inner circle of the housing by an interference fit, which fixes the stator in the housing. The compressive stress generated during assembly can easily damage the magnetic properties of the iron core material, which will increase iron loss, thereby increasing the overall loss of the motor, reducing the motor efficiency, and resulting in higher energy consumption of the whole vehicle.

[0003] In the prior art, in order to alleviate the impact of stress on motors caused by the assembly stress between the housing and the stator, stress relief holes are usually set near the outer periphery of the stator. However, if the stress relief holes are too close to the outer edge of the stator, the outer edge of the stator is prone to severe deformation under the influence of stress, resulting in loose interference fit between the housing and the stator and increased vibration.

[0004] To address the aforementioned issues, existing technologies include: 1) reducing the contact area between the stator's outer circumference and the housing to decrease stress at the stress relief holes; however, excessive reduction in contact area can lead to loose assembly between the housing and the stator; 2) segmenting the stator, with one segment in close contact with the housing and the other segment used to reduce stress effects; however, this method can cause a decrease in stator torque performance; 3) improving the assembly method between the housing and the stator, such as by designing a snap-fit ​​structure; however, snap-fit ​​methods increase the difficulty of parts processing, leading to increased manufacturing costs and poor manufacturability and practicality. Summary of the Invention

[0005] Based on the above problems, the purpose of this invention is to provide a stator structure and motor for new energy vehicles. The stator structure can effectively alleviate assembly stress, reduce motor loss, and improve motor efficiency while ensuring its tight assembly. Moreover, the structure is simple, easy to process, and has low manufacturing cost.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] On the one hand, a stator structure for a new energy vehicle motor is provided. The stator structure includes a stator yoke and a stator tooth. Multiple stator teeth are arranged circumferentially on the inner side of the stator yoke. A stator slot is defined between each two adjacent stator teeth. Stress relief holes are provided on the stator yoke at positions opposite to each stator slot. A first groove is provided on the outer edge of the stator structure at positions opposite to each stator tooth.

[0008] As a preferred embodiment of the motor for new energy vehicles of the stator structure of the present invention, the stress relief hole is a trapezoidal hole, the long side of the trapezoid of the stress relief hole faces the stator slot, the short side of the trapezoid of the stress relief hole faces away from the stator slot, and the stress relief hole is symmetric about the center line of the stator slot.

[0009] As a preferred embodiment of the motor for new energy vehicles of the stator structure of the present invention, the radial thickness of the stator yoke is H1, the distance between the short side of the trapezoid of the stress relief hole and the outer circle of the stator structure is H2, and H2 ≤ H1 / 6.

[0010] As a preferred embodiment of the motor for new energy vehicles of the stator structure of the present invention, the maximum length of the stress relief hole is Y1, the maximum width of the stator slot is L1, Y1 ≤ 2*L1 / 3, the width of the stress relief hole is Y2, and Y2 < H2.

[0011] As a preferred embodiment of the motor for new energy vehicles of the stator structure of the present invention, circulation holes are provided on the stator yoke on the radial extension lines of the opposite sides of each stator tooth portion, and the circulation holes are used for circulating a cooling medium.

[0012] As a preferred embodiment of the motor for new energy vehicles of the stator structure of the present invention, a second groove is further provided on the outer circle edge of the stator structure, the second groove is located between the stress relief hole and the circulation hole, and the size of the second groove is smaller than the size of the first groove.

[0013] As a preferred embodiment of the motor for new energy vehicles of the stator structure of the present invention, both the first groove and the second groove are semi-elliptical grooves, the long axis of the ellipse of the first groove is a1, the short axis of the ellipse is b1, the long axis of the ellipse of the second groove is a2, the short axis of the ellipse is b2, a2 ≤ a1 / 3, and b2 ≤ b1 / 2.

[0014] As a preferred embodiment of the motor for new energy vehicles of the stator structure of the present invention, the first groove is located on the center line of the stator tooth portion, the arc length of the stator tooth portion corresponding to the outer circle of the stator structure is L2, and the arc length of the opening of the first groove corresponding to the outer circle of the stator structure is X, and X ≤ L2 / 2.

[0015] As a preferred embodiment of the motor for new energy vehicles of the stator structure of the present invention, the parallel tooth width of the stator tooth portion is L3, the radial thickness of the stator yoke is H1, the width of the stress relief hole is Y2, and L3 ≤ H1 - Y2.

[0016] On the other hand, a motor is provided, including the stator structure of the motor for new energy vehicles as described above.

[0017] The beneficial effects of the present invention are:

[0018] The stator structure and motor for new energy vehicles provided by this invention, by providing stress-relieving holes at positions opposite to each stator slot on the stator yoke, concentrates most of the stress on the stator structure behind the corresponding stator slot on the stator yoke. This reduces the impact of the pressure generated when the motor housing is pressed in on the stator core material, thereby reducing motor losses and improving motor efficiency. By providing a first groove and a second groove at specific positions on the outer edge of the stator structure, the contact area between the outer surface of the stator structure and the motor housing is reduced. This reduces the stress generated during interference fit between the stator structure and the motor housing, thus reducing motor losses. Furthermore, the presence of the first and second grooves does not affect the tightness of the fit between the stator structure and the motor housing, ensuring a good assembly. In other words, compared to existing technologies, the stator structure of this invention effectively alleviates assembly stress, reduces motor losses, and improves motor efficiency while ensuring tight fit. It also features a simple structure, is easy to process, and has low manufacturing costs. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the stator structure provided in a specific embodiment of the present invention;

[0021] Figure 2 This is a first partial view of the stator structure provided in a specific embodiment of the present invention;

[0022] Figure 3 This is a dimensioned view of the first partial view of the stator structure provided in a specific embodiment of the present invention;

[0023] Figure 4 This is a dimensioned view of a second partial view of the stator structure provided in a specific embodiment of the present invention.

[0024] In the picture:

[0025] 1-Stator yoke; 2-Stator teeth; 3-Stator slot; 4-First groove; 5-Second groove;

[0026] 11-Stress relief hole; 12-Flow hole. Detailed Implementation

[0027] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0030] like Figure 1 As shown, this embodiment provides a stator structure for a new energy vehicle motor, which can be applied to new energy vehicles, etc. The stator structure includes a stator yoke 1 and a stator tooth 2. Multiple stator teeth 2 are arranged circumferentially on the inner side of the stator yoke 1. A stator slot 3 is defined between each two adjacent stator teeth 2. Stress relief holes 11 are provided on the stator yoke 1 at positions opposite to each stator slot 3. A first groove 4 is provided on the outer edge of the stator structure at positions opposite to each stator tooth 2.

[0031] The stator structure for a new energy vehicle motor provided in this embodiment features stress-relieving holes 11 on the stator yoke 1 at positions opposite to each stator slot 3. This concentrates most of the stress on the stator structure behind the corresponding stator slot 3 on the stator yoke 1, reducing the impact of pressure generated during motor housing insertion on the stator core material, thus lowering motor losses and improving motor efficiency. Furthermore, by providing first grooves 4 on the outer edge of the stator structure at positions opposite to each stator tooth 2, the contact area between the outer surface of the stator structure and the motor housing is reduced. This decreases the stress generated during interference fit between the stator structure and the motor housing, further reducing motor losses. The multiple first grooves 4 do not affect the tightness of the fit between the stator structure and the motor housing, ensuring a good assembly. In other words, compared to existing technologies, this stator structure effectively alleviates assembly stress, reduces motor losses, and improves motor efficiency while maintaining tight fit. It also boasts a simple structure, ease of processing, and low manufacturing cost.

[0032] like Figure 1 As shown, the stator structure in this embodiment is a symmetrical structure, with multiple stator teeth 2, multiple stress relief holes 11, and multiple first grooves 4 all symmetrically and evenly distributed. Figure 2 and Figure 4 All Figure 1 A symmetrical unit in the stator structure. The overall design of this stator structure can both reduce the impact of motor housing assembly stress on motor losses and ensure motor torque performance, thereby improving the driving safety of new energy vehicles.

[0033] Optionally, see Figure 1 and Figure 4 The stress relief hole 11 is a trapezoidal hole, with the long side of the trapezoid facing the stator slot 3 and the short side facing away from the stator slot 3. Because the size of the stress relief hole 11 near the stator slot 3 is larger than the size near the outer edge of the stator structure, most of the stress generated at the stress relief hole 11 is concentrated on the side near the stator slot 3, i.e., the stress is concentrated in the rear yoke portion of the stator yoke 1. This effectively reduces the impact of the pressure generated by the housing on the stator structure during assembly on the core loss performance, thereby reducing motor losses and improving motor efficiency.

[0034] Furthermore, the stress relief hole 11 is symmetrical about the center line of the stator slot 3 (i.e., the stress relief hole 11 is an isosceles trapezoidal hole), which makes the stress distribution at both ends of the stress relief hole 11 uniform, avoids stress concentration at one end during assembly, and further reduces the impact of assembly stress on motor loss.

[0035] Optionally, see Figure 2 and Figure 3, the radial thickness of the stator yoke 1 is H1, and the distance between the short trapezoidal side of the stress relief hole 11 and the outer circle of the stator structure is H2, where H2 ≤ H1 / 6. That is, the distance from the outermost side of the stress relief hole 11 to the outer circle of the stator structure is limited within 1 / 6 of the radial thickness of the entire stator yoke 1. This dimension design can ensure that the stress relief hole 11 has a good stress buffering effect, and at the same time can prevent the stress relief hole 11 from excessively weakening the strength at the outer circle of the stator structure, avoiding serious deformation at the outer circle of the stator structure caused by the stress generated at the stress relief hole 11, and ensuring the assembly tightness between the stator structure and the motor housing.

[0036] Optionally, refer to Figure 3 and Figure 4 , the maximum length of the stress relief hole 11 is Y1, the maximum width of the stator slot 3 is L1, and Y1 ≤ 2*L1 / 3. The width of the stress relief hole 11 is Y2, and Y2 < H2. This dimension design makes the size of the stress relief hole 11 appropriate, avoiding affecting the overall magnetic circuit of the stator structure due to the existence of the stress relief hole 11, and ensuring the operation reliability of the motor.

[0037] Optionally, refer to Figures 1 to 3 , flow holes 12 are provided on the radial extension lines on both opposite sides of each stator tooth portion 2 on the stator yoke 1. The flow holes 12 are used for circulating the cooling medium. The multiple flow holes 12 are equivalent to cooling channels. During the operation of the motor, the cooling medium can be sprayed out through the multiple flow holes 12 to play a role in cooling and temperature reduction, ensuring the normal operation of the motor. Setting the flow holes 12 on the extension lines of the sides of the stator tooth portion 2 keeps a certain distance between the flow holes 12 and the stress relief holes 11, preventing the cooling medium from being sprayed into the stress relief holes 11.

[0038] Of course, in other embodiments, the flow holes 12 may not be provided on the extension lines of the sides of the stator tooth portion 2, as long as there is enough distance between the flow holes 12 and the stress relief holes 11.

[0039] Optionally, refer to Figure 2 and Figure 3 , the arc length of the stator tooth portion 2 corresponding to the outer circle of the stator structure is L2, and the arc length of the opening of the first groove 4 corresponding to the outer circle of the stator structure is X, where X ≤ L2 / 2. This dimension design can avoid the first groove 4 from excessively reducing the contact area between the outer circle surface of the stator structure and the motor housing, ensuring the assembly tightness between the stator structure and the motor housing, and at the same time ensuring that the first groove 4 can reduce the stress generated during the interference fit between the stator structure and the motor housing, reducing the motor loss.

[0040] Optionally, refer to Figure 1 and Figure 2A second groove 5 is also provided on the outer edge of the stator yoke 1. The second groove 5 is located between the stress relief hole 11 and the flow hole 12, and the size of the second groove 5 is smaller than the size of the first groove 4. In this embodiment, a second groove 5 is provided between each flow hole 12 and the stress relief hole 11, that is, multiple second grooves 5 are provided on the outer edge of the stator yoke 1. Multiple second grooves 5 can further reduce the contact area between the outer surface of the stator structure and the motor housing, alleviate the assembly stress between the stator structure and the motor housing, and reduce motor losses. The smaller size of the second groove 5 can avoid excessively reducing the contact area between the outer surface of the stator structure and the motor housing, ensuring the tightness of the assembly between the stator structure and the motor housing.

[0041] Optionally, see Figure 2 and Figure 3 Both the first groove 4 and the second groove 5 are semi-elliptical grooves. The major axis of the ellipse of the first groove 4 is a1, and the minor axis is b1. The major axis of the ellipse of the second groove 5 is a2, and the minor axis is b2, where a2 ≤ a1 / 3 and b2 ≤ b1 / 2. This dimensional design ensures that the sizes of the first groove 4 and the second groove 5 are appropriate, avoiding excessive reduction of the contact area between the outer surface of the stator structure and the motor housing, and ensuring the tightness of the stator structure assembly. Designing both the first groove 4 and the second groove 5 as semi-elliptical grooves avoids stress concentration points on the outer surface of the stator structure, and the semi-elliptical grooves are easy to process.

[0042] Optionally, see Figure 1 and Figure 2 The center of each first groove 4 is located on the center line of its corresponding stator tooth 2, so that the first groove 4 is offset from the stress relief hole 11, avoiding the first groove 4 from weakening the overall strength of the stator yoke 1 too much, ensuring that the stator structure and the housing are well assembled, and reducing motor vibration and noise.

[0043] Optionally, see Figure 3 and Figure 4 The parallel tooth width of stator tooth 2 is L3, the radial thickness of stator yoke 1 is H1, and the width of stress relief hole 11 is Y2, where L3 ≤ H1 - Y2. This dimensional design avoids the situation where the motor magnetic flux density increases due to the insufficient radial thickness of stator yoke 1, prevents motor performance loss, ensures that stator yoke 1 has sufficient effective service length, improves motor reliability, and thus improves the driving safety of new energy vehicles.

[0044] This embodiment also provides a motor, including the stator structure for a new energy vehicle motor as described above. The motor employing this stator structure effectively alleviates assembly stress, reduces motor losses, improves motor efficiency, and ensures motor output performance while maintaining tight assembly, thereby enhancing the operational reliability of new energy vehicles.

[0045] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A stator structure for a motor used in new energy vehicles, characterized in that, The stator structure includes a stator yoke (1) and a stator tooth (2). The stator tooth (2) is provided with multiple teeth spaced circumferentially on the inner side of the stator yoke (1). A stator slot (3) is defined between each two adjacent stator teeth (2). Stress relief holes (11) are provided on the stator yoke (1) at positions opposite to each stator slot (3). A first groove (4) is provided on the outer edge of the stator structure at positions opposite to each stator tooth (2). The provision of the first groove (4) reduces the contact area between the outer surface of the stator structure and the motor housing. The stress relief hole (11) is a trapezoidal hole, with the long side of the trapezoid facing the stator slot (3) and the short side of the trapezoid facing away from the stator slot (3). The stress relief hole (11) is symmetrical about the center line of the stator slot (3). The first groove (4) is located on the center line of the stator tooth (2), the stator tooth (2) corresponds to the arc length L2 on the outer circle of the stator structure, and the opening of the first groove (4) corresponds to the arc length X on the outer circle of the stator structure, X≤L2 / 2.

2. The stator structure for a new energy vehicle motor according to claim 1, characterized in that, The radial thickness of the stator yoke (1) is H1, and the distance between the short trapezoidal side of the stress relief hole (11) and the outer circle of the stator structure is H2, where H2 ≤ H1 / 6.

3. The stator structure for a new energy vehicle motor according to claim 2, characterized in that, The maximum length of the stress relief hole (11) is Y1, and the maximum width of the stator slot (3) is L1, where Y1 ≤ 2. L1 / 3, the width of the stress relief hole (11) is Y2, Y2 < H2.

4. The stator structure for a new energy vehicle motor according to claim 1, characterized in that, The stator yoke (1) is provided with a flow hole (12) on the radial extension line of each stator tooth (2) on opposite sides, and the flow hole (12) is used to flow the cooling medium.

5. The stator structure for a new energy vehicle motor according to claim 4, characterized in that, A second groove (5) is also provided on the outer edge of the stator structure. The second groove (5) is located between the stress relief hole (11) and the flow hole (12). The size of the second groove (5) is smaller than the size of the first groove (4).

6. The stator structure for a new energy vehicle motor according to claim 5, characterized in that, Both the first groove (4) and the second groove (5) are semi-elliptical grooves. The major axis of the ellipse of the first groove (4) is a1 and the minor axis is b1. The major axis of the ellipse of the second groove (5) is a2 and the minor axis is b2. a2≤a1 / 3 and b2≤b1 / 2.

7. The stator structure for a new energy vehicle motor according to any one of claims 1-6, characterized in that, The parallel tooth width of the stator tooth (2) is L3, the radial thickness of the stator yoke (1) is H1, the width of the stress relief hole (11) is Y2, and L3≤H1-Y2.

8. An electric motor, characterized in that, Including the stator structure of a motor for new energy vehicles as described in any one of claims 1-7.

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