Novel punching sheet for inhibiting motor fluctuation and arc cutting method

Abstract

The invention relates to a novel punching sheet for inhibiting motor fluctuation and an arc cutting method, the novel punching sheet comprises a yoke ring and a plurality of stator teeth, the stator teeth are uniformly arranged at the inner side of the yoke ring and extend inwards along the radial direction of the yoke ring, and a winding groove is formed between every two adjacent stator teeth; the end face of each stator tooth is provided with an arc cutting structure, and each arc cutting structure comprises two first arc segments and two second arc segments. The two first arc sections are symmetrically arranged on the two sides of the stator tooth center line, and the circle centers of the first arc sections are located on the inner sides of the stator tooth end faces; the two second arc sections are symmetrically arranged at the two ends of the stator tooth end face, and the circle centers of the second arc sections are located on the outer side of the stator tooth end face; according to the invention, the air gaps are respectively generated between the first arc section and the inner mold and between the second arc section and the inner mold, so that the harmonic content in the air gap flux density is reduced, the radial electromagnetic force is optimized, the torque ripple of the motor is weakened, and the vibration noise of the motor is weakened, thereby achieving the effect that the output force of the motor is more stable.

Description

Technical Field

[0001] This invention relates to the technical field of motor manufacturing, and specifically to a novel lamination and arc-cutting method for suppressing motor fluctuations. Background Technology

[0002] The booming development of emerging industries such as new energy, advanced manufacturing, and high-end equipment in today's era is driving a continuous increase in demand for permanent magnet synchronous motors. Advanced manufacturing industries are demanding increasingly higher processing precision, which places higher requirements on the power output end (motor), requiring more stable output force. The torque ripple level of the motor's output torque has become one of the key indicators for improving product competitiveness, and the requirements for this indicator are particularly stringent in the machine tool processing field.

[0003] Torque ripple increases motor vibration and noise, causes mechanical fatigue in motor components, and affects the stability of power transmission. However, due to the structure and operating principle of permanent magnet synchronous motors, torque ripple cannot be completely eliminated; it can only be minimized as much as possible through reasonable methods. Summary of the Invention

[0004] Based on the above description, the present invention provides a novel lamination and arc-cutting method for suppressing motor fluctuations. By generating air gaps between the first arc segment and the inner mold, and between the second arc segment and the inner mold, and by eliminating the tip through the second arc segment, the harmonic content in the magnetic flux density of the air gap is reduced, the radial electromagnetic force is optimized, the torque fluctuation of the motor is weakened, and the vibration noise of the motor is reduced, thereby achieving a more stable motor output force.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: a novel lamination for suppressing motor fluctuations, comprising a yoke ring and a plurality of stator teeth, wherein the stator teeth are uniformly arranged on the inner side of the yoke ring and extend inward along the radial direction of the yoke ring, and a winding groove is formed between every two adjacent stator teeth. Each stator tooth has a beveled structure on its end face, the beveled structure comprising two first arc segments and two second arc segments; the two first arc segments are symmetrically arranged on both sides of the center line of the stator tooth, and the center of the first arc segment is located on the inner side of the end face of the stator tooth; the two second arc segments are symmetrically arranged at both ends of the end face of the stator tooth, and the center of the second arc segment is located on the outer side of the end face of the stator tooth.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, the two second arc segments on the same stator tooth share the same center.

[0008] Furthermore, the radius of the first arc segment on each of the stator teeth is equal.

[0009] This invention also proposes a novel lamination arc-cutting method for suppressing motor fluctuations, used to manufacture stator laminations as described in any of the above-mentioned methods, comprising: (1) Two first arc segments are formed by cutting the end face of the stator teeth along two first cutting arc circles, and the two first cutting arc circles are symmetrically arranged on both sides of the center line of the stator teeth; (2) The end face of the stator tooth is cut along the second cutting arc to form two second arc segments.

[0010] 6. The stator lamination arc trimming method for suppressing motor fluctuations according to claim 5, characterized in that both of the first arc trimming circles pass through the midpoint of the stator tooth end face, and the two first arc trimming circles pass through the two endpoints of the stator tooth end face respectively.

[0011] Furthermore, both of the first cut arc circles pass through the midpoint of the stator tooth end face, and the two first cut arc circles respectively pass through the two endpoints of the stator tooth end face.

[0012] Furthermore, the radius of the first serrated circle is half the radius of the stator tooth end face.

[0013] Furthermore, the second serrated arc passes through the midpoint of the stator tooth end face.

[0014] Furthermore, the intersection of the second serrated circle and the center line of the stator tooth is located inside the end face of the stator tooth.

[0015] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: This invention generates air gaps between the first arc segment and the inner mold, and between the second arc segment and the inner mold, respectively. By eliminating the sharp point through the second arc segment, the harmonic content in the magnetic flux density of the air gap is reduced, the radial electromagnetic force is optimized, the torque fluctuation of the motor is weakened, and the vibration noise of the motor is reduced, thereby achieving a more stable motor output force. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a conventional stator lamination; Figure 2 for Figure 1 Schematic diagram of the middle stator teeth; Figure 3 This is a schematic diagram of the structure of a novel lamination for suppressing motor fluctuations provided in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the stator teeth in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the structure of the first shaped arc circle in Embodiment 2 of the present invention; Figure 6 This is a schematic diagram of the stator teeth after step (1) is completed in Embodiment 2 of the present invention; Figure 7 This is a schematic diagram of the structure of the second shaped arc circle in Embodiment 2 of the present invention; Figure 8 This is an enlarged schematic diagram of the second serrated circle at the end face of the stator tooth in Embodiment 2 of the present invention; Figure 9 This is a schematic diagram of the stator teeth after step (2) is completed in Embodiment 2 of the present invention; Figure 10 This is a schematic diagram of the structure of the second shaped arc circle in Embodiment 3 of the present invention; Figure 11 This is an enlarged schematic diagram of the second serrated circle at the end face of the stator tooth in Embodiment 3 of the present invention; Figure 12 This is a schematic diagram of the stator teeth after step (2) is completed in Embodiment 3 of the present invention; The attached diagram lists the components represented by each number as follows: 1. Yoke ring; 2. Stator teeth; 3. Winding groove; 4. Curved arc structure; 41. First arc segment; 42. Second arc segment; 5. First curved arc circle; 6. Second curved arc circle. Detailed Implementation

[0017] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0019] It is understood that spatial relation terms such as “below,” “under,” “below,” “below,” “above,” “above,” etc., can be used here to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as “below,” “below,” or “below” will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0020] Example 1 A novel lamination for suppressing motor fluctuations includes a yoke ring 1 and multiple stator teeth 2. The stator teeth 2 are evenly arranged on the inner side of the yoke ring 1 and extend inward along the radial direction of the yoke ring 1. A winding groove 3 is formed between every two adjacent stator teeth 2.

[0021] The stator teeth 2 are provided with a beveled structure 4 on their end faces. The beveled structure 4 includes two first arc segments 41 and two second arc segments 42.

[0022] Two first arc segments 41 are symmetrically arranged on both sides of the center line of the stator tooth 2, and the center of the first arc segment 41 is located inside the end face of the stator tooth 2. The radius of the first arc segment 41 on each stator tooth 2 is equal.

[0023] Two second arc segments 42 are symmetrically arranged at both ends of the stator tooth 2 end face, and the center of the second arc segment 42 is located outside the stator tooth 2 end face. The radius of the second arc segment 42 on each stator tooth 2 is equal, and the two second arc segments 42 on the same stator tooth 2 share the same center.

[0024] This embodiment generates air gaps between the first arc segment 41 and the inner mold, and between the second arc segment 42 and the inner mold. The second arc segment 42 eliminates the sharp point, reduces the harmonic content in the magnetic flux density of the air gap, optimizes the radial electromagnetic force, weakens the torque fluctuation of the motor, and reduces the vibration noise of the motor, thereby achieving a more stable motor output force.

[0025] Example 2 A novel lamination arc-cutting method for suppressing motor fluctuations, used in manufacturing the stator laminations of Embodiment 1, includes: (1) Two first arc segments 41 are formed by cutting along the two first cutting arc circles on the end face of the stator tooth 2. The two first cutting arc circles 5 are symmetrically arranged on both sides of the center line of the stator tooth 2.

[0026] Specifically, the centers of the two first etched arc circles 5 are symmetrically set on both sides of the center line of the stator tooth 2. Both first etched arc circles 5 pass through the midpoint of the end face of the stator tooth 2, and the two first etched arc circles 5 pass through the two endpoints of the end face of the stator tooth 2 respectively.

[0027] When the radius of the first cutting arc 5 is equal to the radius of the stator lamination end face, the two arcs coincide, and there is no cutting effect. If the radius of the first cutting arc 5 is too small, the cut portion of the stator lamination will be too large, resulting in a larger effective air gap between the stator and rotor, which in turn reduces the motor output torque. In this embodiment, the radius of the first cutting arc 5 is 1 / 2 of the radius of the stator tooth 2 end face.

[0028] (2) Two second circular arc segments 42 are formed by cutting along the second cutting arc to the end face of the stator tooth 2.

[0029] Specifically, the center of the second etched arc 6 is located on the center line of the stator tooth 2, and the second etched arc 6 passes through the midpoint of the end face of the stator tooth 2.

[0030] Example 3 The difference between this embodiment and Embodiment Two is that the intersection of the second serrated circle 6 and the center line of the stator tooth 2 is located inside the end face of the stator tooth 2. The change in the radius of the second serrated circle 6 can change the serrated shape of the stator inner diameter. The larger the radius of the second serrated circle 6, the larger the area of ​​the stator lamination after serration, and vice versa.

[0031] Compared to Embodiment 2, the second shaped arc required in this embodiment can use a smaller radius, making it more convenient to implement in terms of manufacturing process.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A novel lamination for suppressing motor ripple, characterized by, The stator comprises a yoke ring and a plurality of stator teeth, the stator teeth are evenly arranged on the inner side of the yoke ring and extend radially inward along the yoke ring, and a winding slot is formed between every two adjacent stator teeth; An arc-cutting structure is arranged on the end face of the stator tooth, the arc-cutting structure comprises two first arc segments and two second arc segments; the two first arc segments are symmetrically arranged on both sides of the center line of the stator tooth, and the centers of the first arc segments are located on the inner side of the end face of the stator tooth; the two second arc segments are symmetrically arranged at both ends of the end face of the stator tooth, and the centers of the second arc segments are located on the outer side of the end face of the stator tooth.

2. A novel lamination for suppressing motor ripple as claimed in claim 1, wherein, The two second arc segments on the same stator tooth share a common center.

3. A novel lamination for suppressing motor ripple as claimed in claim 1, wherein, The radii of the first arc segments on each stator tooth are equal.

4. A novel lamination sheet for suppressing fluctuation of a motor according to claim 1, wherein The radii of the second arc segments on each stator tooth are equal.

5. A novel lamination cutting method for suppressing motor fluctuation, for manufacturing the stator lamination of any one of claims 1 to 4, characterized by, The method comprises the following steps: (1) cutting the end face of the stator tooth along two first arc-cutting circles to form the two first arc segments, the two first arc-cutting circles are symmetrically arranged on both sides of the center line of the stator tooth; (2) cutting the end face of the stator tooth along a second arc-cutting circle to form the two second arc segments.

6. A novel lamination segment arc cutting method for suppressing motor fluctuation according to claim 5, characterized in that, The two first arc-cutting circles pass through the midpoint of the end face of the stator tooth, and the two first arc-cutting circles pass through the two end points of the end face of the stator tooth, respectively.

7. A novel lamination segment arc cutting method for suppressing motor fluctuation according to claim 5, characterized in that, The radius of the first arc-cutting circle is 1 / 2 of the radius of the end face of the stator tooth.

8. A novel lamination segment arc cutting method for suppressing motor fluctuation according to claim 5, characterized in that, The second arc-cutting circle passes through the midpoint of the end face of the stator tooth.

9. A novel lamination segment arc trimming method for suppressing motor ripple as claimed in claim 5, wherein, The intersection of the second arc-cutting circle and the center line of the stator tooth is located on the inner side of the end face of the stator tooth.

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