Stator punching sheet

Abstract

The utility model relates to the technical field of motor stators, in particular to a stator punching sheet which comprises an integrally annular yoke portion, tooth portions evenly distributed along the circumference are arranged in the yoke portion, a tooth groove is formed between every two adjacent tooth portions, one side, close to the yoke portion, of each tooth groove is in an arc shape, the other ends of the tooth portions are all provided with shoe portions, and the shoe portions are arranged on the yoke portion. The shoe part is arc-shaped, the arc length of the shoe part is smaller than that of one side, close to the yoke part, of each tooth groove, and heat dissipation grooves are evenly distributed in the surface, corresponding to the tooth grooves, of the yoke part. The torque output by the motor can be effectively improved, and meanwhile the service life of the motor can be prolonged.

Description

Technical Field

[0001] This application relates to the technical field of motor stators, and in particular to a stator lamination. Background Technology

[0002] An AC motor is a device that converts alternating current electrical energy into mechanical energy. It is widely used in industries, household appliances, transportation and other fields. In an AC motor, the rotor is the core component that generates induced electromotive force and electromagnetic torque and realizes electromechanical energy conversion. It includes the iron core, windings and shaft, while the stator mainly includes the iron core, windings and end caps. Its core function is to generate a rotating magnetic field.

[0003] Current stator laminations are typically designed with a 24 / 34-slot multi-tooth structure to achieve greater motor torque output. This reduces the size of the stator yoke, leading to increased guiding resistance and conductor impedance. Additionally, the reduced spacing between connected coils makes the proximity effect more likely, resulting in a decrease in current density around the conductor contact surface. This is detrimental to motor thermal management and efficiency improvement. Utility Model Content

[0004] In order to effectively increase the output torque of the motor and extend its service life, this application provides a stator lamination.

[0005] This application provides a stator lamination, including an annular yoke portion, the yoke portion containing teeth evenly distributed along the circumference, a tooth groove being formed between two adjacent teeth, the side of the tooth groove near the yoke portion being arc-shaped, and a boot portion being provided at the other end of each of the teeth, the boot portion being arc-shaped, the arc length of the boot portion being less than the arc length of the tooth groove near the yoke portion, and the surface of the yoke portion corresponding to the tooth groove being provided with evenly distributed heat dissipation grooves.

[0006] By adopting the above technical solution, the overall ring-shaped yoke design facilitates the arrangement and installation of the motor and the utilization of space; the teeth are evenly distributed along the circumference to form tooth grooves, which is conducive to the uniform arrangement of the motor stator windings, and the tooth grooves are set in an arc shape on the side near the yoke, which, compared with the traditional straight edge design, can make the magnetic field distribution more uniform, reduce the local magnetic resistance in the magnetic circuit, and improve the electromagnetic conversion efficiency of the motor.

[0007] In addition, by providing an arc-shaped shoe at the other end of the tooth, with the arc length of the shoe being less than the arc length of the tooth groove near the yoke, this design can adjust the distribution of the air gap magnetic field, reduce harmonic content, and lower the electromagnetic noise and vibration of the motor. It also helps to improve the output torque and power of the motor. Furthermore, by providing uniformly distributed heat dissipation grooves on the surface of the tooth groove corresponding to the yoke, the contact area between the yoke and the cooling medium is increased, which can enhance the heat dissipation effect, reduce the temperature of the motor during operation, and improve the efficiency and reliability of the motor.

[0008] Optionally, the width of the yoke is greater than or equal to the length of the teeth.

[0009] By adopting the above technical solution, the width of the yoke is greater than or equal to the length of the tooth, which can effectively increase the size of the stator yoke. Increasing the size of the stator yoke can increase the magnetic flux, reduce the magnetic resistance, make the magnetic field distribution more uniform, improve the electromagnetic conversion efficiency of the motor, and allow the motor to output greater torque and power. At the same time, it can also make the magnetic flux density distribution more reasonable, reduce the iron loss per unit volume, reduce motor heat generation, and improve the efficiency and reliability of the motor.

[0010] Optionally, the side of the boot portion closest to the tooth groove is configured as an arc shape.

[0011] By adopting the above technical solution, the side of the boot near the tooth groove is set to be arc-shaped, which further optimizes the distribution of the air gap magnetic field, makes the magnetic field smoother, reduces the abrupt changes and distortions of the magnetic field, thereby reducing the electromagnetic noise and vibration of the motor and improving the stability and comfort of motor operation.

[0012] Optionally, the heat dissipation groove is connected to the inner side of the tooth groove.

[0013] By adopting the above technical solution, the inner side of the heat dissipation groove is connected to the tooth groove, so that the cooling medium can form a smoother flow channel between the heat dissipation groove and the tooth groove. This can better remove the heat generated by the winding in the tooth groove, improve the heat dissipation efficiency, and effectively reduce the temperature, especially for the parts of the winding where the heat is concentrated, ensuring the normal operation of the motor.

[0014] Optionally, the heat dissipation grooves at the multiple toothed locations are interconnected.

[0015] By adopting the above technical solution, the heat dissipation grooves at multiple tooth slot positions are interconnected, forming an overall heat dissipation channel network. This allows the cooling medium to flow more evenly throughout the stator laminations, avoiding the problem of uneven local heat dissipation, further improving the heat dissipation effect, ensuring that the temperature of the motor in various parts can be effectively controlled, and improving the overall performance and reliability of the motor.

[0016] Optionally, a first connecting hole is provided on the outer side of the yoke, and the first connecting hole extends to the inner side of the yoke and communicates with a plurality of heat dissipation grooves.

[0017] By adopting the above technical solution, a first connecting hole is provided on the outer side of the yoke, and the first connecting hole extends to the inner side of the yoke and is connected to multiple heat dissipation grooves, providing an additional inlet and outlet channel for the cooling medium. This can enhance the flow rate and flow of the cooling medium in the heat dissipation grooves, improve heat dissipation efficiency, and at the same time, facilitate the connection of a cooling system to the outside of the motor to achieve better thermal management.

[0018] Optionally, the surface of the yoke is provided with a second connecting hole that communicates with the first connecting hole.

[0019] By adopting the above technical solution, a second connecting hole is opened on the surface of the yoke, which is connected to the first connecting hole. This further increases the flow path and method of the cooling medium. The cooling medium can be flexibly introduced or discharged according to different cooling requirements and motor structure, thereby optimizing the cooling effect and improving the heat dissipation performance of the motor under different operating conditions.

[0020] Optionally, a partition strip is provided inside the first connecting hole to divide the interior of the first connecting hole into two chambers.

[0021] By adopting the above technical solution, a partition strip is provided inside the first connecting hole, dividing the interior of the first connecting hole into two chambers. This allows for the diversion and regulation of the cooling medium entering the first connecting hole, enabling the cooling medium to be distributed more evenly to each heat dissipation groove. This avoids uneven flow of the cooling medium, thereby improving the uniformity and effectiveness of heat dissipation, ensuring temperature consistency in all parts of the motor, and enhancing the overall performance and reliability of the motor.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. The overall annular yoke design facilitates the arrangement and installation of the motor and optimizes space utilization. The teeth are evenly distributed around the circumference to form grooves, which is beneficial for the uniform arrangement of the motor stator windings. Furthermore, the grooves near the yoke are arc-shaped, which, compared to the traditional straight-edge design, results in a more uniform magnetic field distribution, reduces local magnetic resistance in the magnetic circuit, and improves the motor's electromagnetic conversion efficiency. Additionally, by providing an arc-shaped shoe at the other end of the teeth, with the shoe's arc length being less than the arc length of the groove near the yoke, this design can adjust the distribution of the air gap magnetic field, reduce harmonic content, lower the motor's electromagnetic noise and vibration, and also help improve the motor's output torque and power. Moreover, by providing evenly distributed heat dissipation grooves on the surface of the corresponding grooves on the yoke, the contact area between the yoke and the cooling medium is increased, enhancing heat dissipation, reducing the motor's operating temperature, and improving the motor's efficiency and reliability.

[0024] 2. By setting the side of the shoe near the tooth groove to be arc-shaped, the distribution of the air gap magnetic field is further optimized, making the magnetic field smoother and reducing abrupt changes and distortions in the magnetic field. This reduces the electromagnetic noise and vibration of the motor and improves the stability and comfort of motor operation.

[0025] 3. By providing a first connecting hole on the outer side of the yoke, and extending the first connecting hole to the inner side of the yoke and connecting with multiple heat dissipation grooves, an additional inlet and outlet channel is provided for the cooling medium. This enhances the flow rate and flow of the cooling medium in the heat dissipation grooves, improves heat dissipation efficiency, and facilitates the connection of a cooling system to the outside of the motor for better thermal management. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of a stator lamination according to an embodiment of this application;

[0027] Figure 2 This is a partial structural diagram of the tooth groove and boot part in Embodiment 1 of this application;

[0028] Figure 3 This is a schematic diagram of the heat dissipation groove and the partition strip in Embodiment 2 of this application.

[0029] Explanation of reference numerals in the attached drawings: 1. Yoke; 11. First connecting hole; 12. Second connecting hole; 13. Separator; 2. Tooth; 3. Tooth groove; 4. Boot; 5. Heat dissipation groove; 6. Extension groove. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0031] This application discloses a stator lamination.

[0032] Example 1:

[0033] Reference Figure 1-2 The stator lamination includes a ring-shaped yoke 1, wherein teeth 2 are evenly distributed in a circular pattern on the inner side of the yoke 1, and a tooth groove 3 is formed between two adjacent teeth 2, and the side of the tooth groove 3 closest to the yoke 1 is set as arc-shaped.

[0034] Meanwhile, a boot portion 4 is provided at the end of each tooth portion 2 away from the stator yoke portion 1, and the boot portion 4 is arc-shaped, with the arc length of the boot portion 4 being less than the arc length of the tooth groove 3 on the side near the yoke portion 1. In addition, heat dissipation grooves 5 are uniformly distributed on the surface of the yoke portion 1 corresponding to the tooth groove 3, and a second connecting hole 12 is provided on the outer surface of the yoke portion 1. In this embodiment, the width of the yoke portion 1 is greater than or equal to the size of the tooth portion 2, and the side of the boot portion 4 near the tooth groove 3 is arc-shaped.

[0035] Specifically, refer to Figure 2One side of each of the multiple heat dissipation grooves 5 is connected to the inner side of the corresponding tooth groove 3, and the multiple heat dissipation grooves 5 in the same tooth groove 3 are interconnected. At the same time, each heat dissipation groove 5 has an extension groove on both sides in the length direction. Through the extension groove design on both sides, each heat dissipation groove 5 can be connected to both sides of the yoke 1, so as to better conduct heat dissipation for the stator winding.

[0036] Example 2:

[0037] The difference between this embodiment and Embodiment 1 is that, in this embodiment, reference is made to... Figure 1 and 3 A first connecting hole 11 is provided on the outer side wall of the yoke 1, and the two ends of the first connecting hole 11 extend to communicate with the second connecting hole 12 and the heat dissipation groove 5, so that the heat dissipation groove 5 can communicate with the external environment through the first connecting hole 11 and the second connecting hole 12.

[0038] In addition, a partition strip 13 is provided inside the first connecting hole 11, and the first connecting hole 11 is divided into two chambers by the partition strip 13, and each side of the partition strip 13 is set as a slope.

[0039] Working principle: During operation, the cooling medium can enter the first connecting hole 11 from multiple heat dissipation grooves 5, and be diverted and regulated by the partition bar 13, so that the cooling medium is more evenly distributed to each heat dissipation groove 5, avoiding uneven flow of the cooling medium, thereby improving the uniformity and effectiveness of heat dissipation, ensuring the temperature consistency of each part of the motor, and improving the overall performance and reliability of the motor.

[0040] The embodiments described herein are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A stator lamination, characterized in that: The yoke (1) is annular in shape. The yoke (1) contains teeth (2) evenly distributed along the circumference. A tooth groove (3) is formed between two adjacent teeth (2). The tooth groove (3) is arc-shaped on the side near the yoke (1). The other end of each tooth (2) is provided with a boot (4). The boot (4) is arc-shaped. The arc length of the boot (4) is less than the arc length of the tooth groove (3) on the side near the yoke (1). The surface of the yoke (1) corresponding to the tooth groove (3) is provided with evenly distributed heat dissipation grooves (5).

2. A stator lamination according to claim 1, characterized in that: The width of the yoke (1) is greater than or equal to the length of the tooth (2).

3. A stator lamination according to claim 1, characterized in that: The side of the boot part (4) near the tooth groove (3) is set to be arc-shaped.

4. A stator lamination according to claim 3, characterized in that: The heat dissipation groove (5) is connected to the inner side of the tooth groove (3).

5. A stator lamination according to claim 4, characterized in that: The heat dissipation grooves (5) at the locations of the multiple tooth grooves (3) are all interconnected.

6. A stator lamination according to claim 5, characterized in that: The outer side of the yoke (1) is provided with a first connecting hole (11), which extends to the inner side of the yoke (1) and is connected to a plurality of heat dissipation grooves (5).

7. A stator lamination according to claim 6, characterized in that: The surface of the yoke (1) is provided with a second connecting hole (12) that communicates with the first connecting hole (11).

8. A stator lamination according to claim 6, characterized in that: A partition strip (13) is provided inside the first connecting hole (11) to divide the interior of the first connecting hole (11) into two chambers.

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