Stator core with indentation on end surface and manufacturing method thereof

Abstract

The present invention discloses a stator core for a motor, wherein the end face of the stator core is provided with an indentation and has good end face parallelism and perpendicularity to the axial direction of the stator core. The present invention also discloses a motor comprising the stator core, wherein the front end cover and / or the rear end cover are provided with a protrusion that matches the indentation of the stator core. The present invention also discloses a method for manufacturing a stator core, wherein the main steps are: 1. preparing a mold; 2. placing the stator core between the inner ring and the outer ring; and 3. pressing. The stator core of the present invention has good parallelism and perpendicularity, and is more firmly clamped with the end cover, ensuring a uniform gap between the stator and the rotor, and effectively reducing motor vibration and noise. A motor equipped with such a stator core can improve safety performance and stability. Using the manufacturing method of the stator core with end face indentation of the present invention, the clamping parts of the two end faces and the inner diameter of the stator core are simultaneously pressed using a mold, so that good form and position tolerances are achieved.

Description

Technical Field

[0001] The present invention relates to the field of motor stator cores, and in particular to a stator core with an end surface having an indentation and a manufacturing method thereof. Background Art

[0002] Rotating motors are a common equipment widely used in production and life. In some applications, there are high requirements for the structure and quality of the motors.

[0003] If there is uneven gap between the stator and rotor during the design, assembly and use of rotating motors, the motor will vibrate, rub and generate noise, affecting the safe operation of the equipment, reducing the stability of the motor, causing noise pollution, shortening the service life, and in severe cases causing damage to the equipment and leading to accidents.

[0004] In the prior art, the stator core of an automotive generator is secured by aligning the two end faces of the stator core with the front and rear end covers and fastening them with bolts. This structural feature of the motor places stringent requirements on the parallelism of the stator core's two end faces and the perpendicularity of the end faces to the stator core's axial direction, which directly affects the uniformity of the stator and rotor gaps. The stator core is composed of a stack of punched and stacked thin plates. Due to sheet metal discrepancies and other factors, it is difficult to achieve good form and position tolerances. To achieve the desired parallelism of the stator core's two end faces, the conventional process involves turning indentations on the two end faces to ensure form and position tolerances. This results in relatively poor accuracy and high cost.

[0005] In addition, this structural design and assembly method can easily cause the stator core to shift during operation, generating vibration and noise, and may further lead to uneven gaps between the stator and rotor, exacerbating damage to the equipment and affecting the safe operation and service life of the motor.

[0006] Therefore, technicians in this field are committed to developing a stator core for a rotating motor. The two end faces of the stator core have good parallelism and good perpendicularity to the axial direction of the core. The core and the end cover are clamped more firmly and are not prone to radial movement, ensuring that the gap between the stator and rotor is uniform, effectively improving the safety and stability of the rotating motor, and the production cost is low and the processing precision is higher. Summary of the Invention

[0007] In order to solve the above problems existing in the prior art, the present invention provides a stator core for a rotating electrical machine, wherein the end faces of the stator core are provided with indentations and have good parallelism of both end faces and perpendicularity of the end faces to the axial direction of the stator core.

[0008] A stator core of a motor, wherein two end faces of the stator core are parallel to each other and perpendicular to the axial direction of the stator core;

[0009] Furthermore, the end surface of the stator core is provided with an indentation;

[0010] Furthermore, the indentations are produced by simultaneously pressing both end surfaces of the stator core using a mold;

[0011] Furthermore, the indentation is a recess that is lower than the horizontal plane of the end surface of the core;

[0012] Furthermore, the indentation is a convex mark higher than the horizontal plane of the end surface of the iron core;

[0013] Furthermore, both end surfaces of the stator core are provided with indentations;

[0014] Furthermore, the indentation is provided on the outermost edge of the end surface of the stator core;

[0015] Furthermore, the indentation is a discontinuous segmented structure;

[0016] Furthermore, one end surface of the stator core is provided with more than one indentation, and the multiple indentations are concentric circles and radially distributed along the end surface of the core.

[0017] Furthermore, the stator core is a rectangular structure, the end surface of the stator core is a rectangular plane, and the indentation is a rectangle.

[0018] Furthermore, the indentations are discontinuous, specifically the four right angles of a rectangle.

[0019] The present invention also proposes a motor including the above-mentioned stator core, including a front end cover and a rear end cover, wherein the front end cover and / or the rear end cover are provided with a protrusion, the shape, size and position of the protrusion match the indentation of the stator core, and is used to clamp the stator core.

[0020] The present invention also proposes a method for manufacturing a stator core with end face indentations: A mold is used to simultaneously press the clamping areas and inner diameter of the stator core at both end faces, achieving good geometric and positional tolerances. The mold comprises an outer ring that mimics the outer diameter of the stator core; an inner ring that mimics the inner diameter of the stator core; and a convex portion between the outer and inner rings. Furthermore, the convex portion is divided into two portions, one above the other. The stator core is pressed within the mold.

[0021] A method for manufacturing the stator core comprises the following main steps:

[0022] Step 1: Prepare the mold;

[0023] Step 2: Place the stator core between the inner ring and the outer ring;

[0024] Step 3: Suppression.

[0025] Furthermore, the mold includes an inner ring, an outer ring, an upper convex portion, and a lower convex portion.

[0026] The outer diameter of the inner ring matches the inner diameter of the stator core, and the inner diameter of the outer ring matches the outer diameter of the stator core; the upper convex portion and the lower convex portion are arranged between the outer ring and the inner ring.

[0027] Furthermore, the upper convex portion and the lower convex portion are arranged between the outer ring and the inner ring; the lower end surface of the upper convex portion and the upper end surface of the lower convex portion are parallel to each other; and both are perpendicular to the axial direction of the inner ring;

[0028] Furthermore, the outer ring is a whole;

[0029] Furthermore, the upper convex portion and the lower convex portion are both provided with steps;

[0030] Furthermore, the step three is specifically as follows: using the mold to simultaneously press the two end faces of the stator core, using the lower end face of the upper protrusion and the upper end face of the lower protrusion to ensure the parallelism of the end face of the stator core and the perpendicularity of the end face to the axial direction of the core, and using the step to form an indentation on the end face of the stator core.

[0031] Furthermore, the outer ring is divided into an upper outer ring and a lower outer ring; a step is provided between the upper outer ring and the upper convex portion, and a step is provided between the lower outer ring and the lower convex portion;

[0032] Furthermore, the step three is specifically as follows: using the mold to simultaneously press the two end faces of the stator core, using the lower end face of the upper convex portion and the upper end face of the lower convex portion to ensure the parallelism of the end faces of the stator core and the perpendicularity of the end faces to the axial direction of the core, and using the step between the upper outer ring and the upper convex portion and the step between the lower outer ring and the lower convex portion to form an indentation on the end face of the stator core.

[0033] Compared with the prior art, the present invention has the following advantages and characteristics:

[0034] The stator core according to the present invention has good parallelism and verticality, and indentations are provided at the clamping positions between the end faces of the core and the front and rear end covers, so that the clamping with the end covers is more stable and less prone to radial movement, thereby ensuring a uniform gap between the stator and rotor, effectively reducing motor vibration and noise, and improving the safety and stability during motor operation, and effectively extending the service life of the equipment.

[0035] A rotating electric machine equipped with this type of stator core can improve the safety performance and stability of the electric machine.

[0036] The present invention employs a method for manufacturing a stator core with end face indentations. Using a mold, the clamping areas and inner diameter of both end faces of the stator core are simultaneously pressed, achieving superior geometric tolerances. This effectively improves the parallelism of the stator core's end faces and the perpendicularity of the end faces to the core's axial direction. Compared to conventional processes that rely on turning indentations on both end faces to ensure geometric tolerances, this method improves product precision while significantly reducing costs.

[0037] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a three-dimensional schematic diagram of a motor stator core structure having an indentation on the end surface according to a preferred embodiment of the present invention;

[0039] Figure 2 3-D view of a motor stator core structure having an indentation on the end surface according to a preferred embodiment of the present invention;

[0040] Figure 3 This is a schematic diagram of a clamping method for a stator core and an end cover according to a preferred embodiment of the present invention;

[0041] Figure 4 It is a cross-sectional schematic diagram of the stator core and the front and rear end covers after being matched in a preferred embodiment of the present invention;

[0042] Figure 5 yes Figure 4 A partial enlarged view of the middle B area;

[0043] Figure 6 This is a cross-sectional view of a mold opening for a method for manufacturing a stator core according to a preferred embodiment of the present invention;

[0044] Figure 7 This is a closed mold cross-sectional view of a method for manufacturing a stator core according to a preferred embodiment of the present invention;

[0045] Figure 8 This is a cross-sectional view of a mold opening for a stator core manufacturing method according to another preferred embodiment of the present invention.

[0046] Figure 9 It is a closed mold sectional view of a method for manufacturing a stator core according to another preferred embodiment of the present invention.

[0047] In the figure, 1 is the stator core, 101 is the indentation, 102 is the front cover, 103 is the rear cover, 104 is the bolt, 105 is the inner ring, 106 is the outer ring, 107 is the upper convex part, and 108 is the lower convex part. DETAILED DESCRIPTION

[0048] The following describes several preferred embodiments of the present invention with reference to the accompanying drawings to make its technical content clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and the scope of protection of the present invention is not limited to the embodiments mentioned herein.

[0049] In the drawings, components with identical structures are denoted by the same reference numerals, and components with similar structures or functions are denoted by similar reference numerals. The size and thickness of each component shown in the drawings are arbitrary and are not limited by the present invention. For clarity, the thickness of components in some places in the drawings is appropriately exaggerated.

[0050] Example 1

[0051] like Figure 1 、 Figure 2 FIG. 1 shows a preferred embodiment of the present invention. The two end faces of the motor stator core 1 are parallel to each other and perpendicular to the axial direction of the stator core 1. Indentations 101 are provided on the end faces. Preferably, both end faces are provided with indentations 101. Indentations 101 are produced by simultaneously pressing the two end faces of the stator core 1 using a mold. Indentations 101 can be concave below the horizontal plane of the core end face or convex above the horizontal plane of the core end face; in this embodiment, they are concave.

[0052] The indentation 101 can be set at any position on the end surface. In a preferred embodiment, the indentation is set at the outermost edge of the end surface of the stator core 1; the indentation 101 can be a continuous structure or a discontinuous segmented structure; more than one indentation 101 can be provided on one end surface of the stator core 1. On the cylindrical end surface of the core, the multiple indentations are concentric circles and radially distributed along the end surface of the core.

[0053] In another preferred embodiment, the stator core 1 is a rectangular structure, and the indentations on its end surface are rectangular. The indentations can be continuous or discontinuous segmented; preferably, the discontinuous indentations are the four right angles of the rectangle.

[0054] Example 2

[0055] like Figure 3 、 Figure 4 、 Figure 5 As shown, it is a schematic diagram of a stator core clamping method according to a preferred embodiment of the present invention. Both end faces of the stator core 1 are provided with indentations 101, which cooperate with the clamping parts of the front cover 102 and the rear cover 103 to make the entire motor clamping more stable and less prone to radial movement, ensuring uniform clearance between the stator and rotor, effectively reducing motor vibration and noise, not only improving the safety and stability during motor operation, but also effectively extending the service life of the equipment.

[0056] like Figure 3 Figure 1 is an exploded view of a stator core clamping method according to a preferred embodiment of the present invention. The stator core 1 is clamped between the rear end cover 103 and the front end cover 102. The indented areas on the stator core end face mate with the clamping areas of the front and rear end covers 102 and 103, and are fastened with bolts 104.

[0057] like Figure 4 As shown in FIG, it is a cross-sectional view of the stator core 1, the front end cover 102 and the rear end cover 103 after being matched. The stator core 1, the front end cover 102 and the rear end cover 103 are fixed by bolts 104. Figure 5 Shown Figure 4 In the partially enlarged view of the portion B in the middle, the indentation 101 of the stator core 1 is matched with the clamping portions of the front cover 102 and the rear cover 103 respectively.

[0058] Example 3

[0059] like Figure 6 、 Figure 7 As shown in FIG, it is a preferred embodiment of the method for manufacturing the stator core according to the present invention. Figure 6 The figure shows a cross-sectional view of the mold opening for the stator core manufacturing method. Figure 6 In the embodiment, the stator core 1 is placed on the inner ring 105. There are steps between the upper protrusion 107 and the outer ring 106 and between the lower protrusion 108 and the outer ring 106 to achieve the indentation of the stator core.

[0060] Figure 7 1 is a cross-sectional view of a mold closing method for manufacturing a stator core according to an embodiment of the present invention. Figure 7 In the figure, the stator core 1 is wrapped in the inner ring 105, the outer ring 106, the upper protrusion 107, and the lower protrusion 108. After stamping, the two end faces of the stator core 1 are parallel to each other and perpendicular to the inner diameter of the core. Indentations 101 are formed on the outer edges of the two end faces of the stator core 1.

[0061] Example 4

[0062] like Figure 8 、 Figure 9The figure shows another preferred embodiment of the stator core manufacturing method proposed by the present invention. This differs from Example 3 in that the outer ring 106 is integral, not divided into upper and lower sections. The lower end surface of the upper protrusion 107 and the upper end surface of the lower protrusion 108 are each provided with a step. The stator core 1 is enclosed within the inner ring 105, outer ring 106, upper protrusion 107, and lower protrusion 108. After stamping, the lower end surface of the upper protrusion 107 and the upper end surface of the lower protrusion 108 ensure the parallelism of the stator core's end faces and their perpendicularity to the core's axial direction. The two end faces of the stator core 1 are parallel to each other and perpendicular to the core's inner diameter. The steps on the lower end surface of the upper protrusion 107 and the upper end surface of the lower protrusion 108 create indentations 101 on the outer edges of both end faces of the stator core 1.

[0063] The preferred embodiments of the present invention have been described in detail above. It should be understood that numerous modifications and variations based on the concepts of the present invention are possible without inventive effort by those skilled in the art. Therefore, any technical solution that can be derived by one skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A stator core of a motor, characterized in that: The two end faces of the stator core are parallel to each other and perpendicular to the axial direction of the stator core; the end faces of the stator core are provided with indentations, and one end face of the stator core is provided with more than one indentation, the more than one indentations are concentric circles and are radially distributed along the end face of the core, and the indentations are discontinuous and segmented. The manufacturing method of the stator core is: Step 1: Prepare the mold; The mold includes an inner ring, an outer ring, an upper convex part, and a lower convex part; Step 2: placing the stator core between the inner ring and the outer ring; Step 3: Suppression; The outer diameter of the inner ring matches the inner diameter of the stator core, and the inner diameter of the outer ring matches the outer diameter of the stator core. The upper convex portion and the lower convex portion are arranged between the outer ring and the inner ring; the lower end surface of the upper convex portion and the upper end surface of the lower convex portion are parallel to each other; and are both perpendicular to the axial direction of the inner ring. The upper convex portion and the lower convex portion are provided with steps.

2. The stator core according to claim 1, wherein: The indentations are produced by simultaneously pressing the two end surfaces of the stator core using a mold.

3. The stator core according to claim 1, wherein: The indentation is a concave mark lower than the horizontal plane of the end surface of the stator core or a convex mark higher than the horizontal plane of the end surface of the stator core.

4. The stator core according to claim 1, wherein: Both end surfaces of the stator core are provided with indentations.

5. The stator core according to claim 1, wherein: The indentation is arranged at the outermost edge of the end surface of the stator core.

6. The stator core according to claim 1, wherein: The stator core is a rectangular structure, the end surface of the stator core is a rectangular plane, and the indentation is a rectangle.

7. The stator core according to claim 1, wherein: The step three specifically includes: using the mold to simultaneously press the two end faces of the stator core, using the lower end face of the upper protrusion and the upper end face of the lower protrusion to ensure the parallelism of the end faces of the stator core and the perpendicularity of the end faces to the axial direction of the stator core, and using the step to form an indentation on the end face of the stator core.

8. The stator core according to claim 1, wherein: The outer ring is divided into an upper outer ring and a lower outer ring; A step is provided between the upper outer ring and the upper convex portion, and a step is provided between the lower outer ring and the lower convex portion.

9. The stator core according to claim 8, wherein: The step three specifically includes: using the mold to simultaneously press the two end faces of the stator core, using the lower end face of the upper convex portion and the upper end face of the lower convex portion to ensure the parallelism of the end faces of the stator core and the perpendicularity of the end faces to the axial direction of the core, and using the step between the upper outer ring and the upper convex portion and the step between the lower outer ring and the lower convex portion to form an indentation on the end face of the stator core.

10. A motor comprising the stator core according to any one of claims 1 to 6, further comprising a front cover and a rear cover, wherein: The front end cover and / or the rear end cover are provided with a protrusion.

11. The motor according to claim 10, wherein The shape, size and position of the protrusion match the indentation of the stator core and are used for clamping the stator core.

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