Motor stator coil framework and motor

Abstract

The invention belongs to the technical field of motor accessories, and particularly relates to a motor stator coil framework machine motor. The motor stator coil framework comprises a coil framework body, the axial side of the coil framework body is provided with a supporting surface used for supporting a circuit board, and the axial side of the coil framework body is provided with a plurality of buckles. The buckle is provided with a buckle portion located on the axial side of the supporting face and a connecting portion connected between the buckle portion and the coil framework body, and the thickness of the root end, connected with the coil framework body, of the connecting portion is smaller than the thickness of the portion, deviating from the root end, of the connecting portion. The motor with the motor stator coil framework comprises a circuit board, third notches in one-to-one correspondence with the buckles are formed in the circumferential outer edge of the circuit board, and the width of the third notches is roughly the same as the width of the end portion of the connecting portion. And the circuit board is limited between the axial surface of the buckling part and the supporting surface. The buckle has the advantage that the buckle is convenient to bend, so that the buckle is prevented from being broken.

Description

Technical Field

[0001] The present invention belongs to the technical field of motor accessories, and in particular relates to a motor stator coil skeleton. Background Art

[0002] Chinese patent application number 201721140694.4 discloses a stator assembly and a slotless stator core, comprising a cylindrical slotless stator core having a first central through-hole and a stator winding. The stator assembly further comprises a plastic inner wall, a left plastic end portion, and a right plastic end portion, formed by injection molding the slotless stator core with engineering plastic. The plastic inner wall further comprises a plurality of plastic teeth, a plastic slot between adjacent plastic teeth, and a second central through-hole formed at the free end of each plastic tooth. The number of plastic slots is equal to the number of plastic teeth. The stator winding comprises a stator coil having the same number of stator coils as the number of plastic teeth, each stator coil being wound around a corresponding plastic tooth. The outer edge of the left plastic end portion further comprises at least two plastic circuit board clips formed by injection molding.

[0003] When installing the circuit board, the above-mentioned solution deforms and bends the plastic clip outward, making it easier for the clip to fit into the circuit board's fixing hole. In actual use, the pressure on the plastic clip is unlikely to be uniformly along the radial direction of the stator core. This results in uneven force at the clip's base, resulting in poor bending performance. Greater force is required to deform the clip, which can easily lead to breakage at the clip's base. Summary of the Invention

[0004] The object of the present invention is to provide a motor stator coil skeleton which facilitates buckle bending, thereby preventing the buckle from breaking.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: a motor stator coil frame, including a coil frame body, the axial side of the coil frame body having a support surface for supporting a circuit board, the axial side of the coil frame body is provided with a plurality of clips, the clips having a clip portion located on the axial side of the support surface and a connecting portion connected between the clip portion and the coil frame body, the thickness of the root end where the connecting portion is connected to the coil frame body is less than the thickness of the connecting portion deviating from the root end.

[0006] When assembling the circuit board, the buckle deforms under the action of pressure, and the buckle part deviates radially outward, so that the circuit board can enter the radial inner side of several buckles, so that the end face of the circuit board is supported on the supporting surface of the coil skeleton body. The buckle is reset and the other end face of the circuit board is restricted to the axial side of the buckle part, thereby restricting the circuit board between the buckle part of the buckle and the coil skeleton body.

[0007] The connecting portion of the buckle of the present invention is thinner at the root end for connection with the coil bobbin to form a groove. When the buckle is deformed by pressure, the pressure is not transmitted along the axis of symmetry of the buckle, making it easier for the buckle to deform and bend at the thinner root end. When the buckle is subjected to force, it can bend away from the axis of symmetry, facilitating deformation of the buckle under relatively low pressure. At the same time, stress concentration is avoided, thereby reducing or even preventing breakage at the root end of the buckle. The buckle can be any existing buckle structure provided on the stator coil bobbin of a motor, such as a hook-shaped buckle structure with an inclined end.

[0008] Preferably, the radial sidewall of the root end of the connection part is recessed so that the thickness of the root end of the connection part is smaller than the thickness of the connection part at a position deviating from the root end, and the root end of the connection part forms a first groove extending along the circumferential direction of the coil skeleton.

[0009] By slotting the radial outer wall or the radial inner wall of the buckle connection portion to thin the root end of the connection portion, it is easy to process the buckle and at the same time easy to achieve radial bending deformation of the buckle.

[0010] Preferably, the side wall of the end portion of the coil skeleton body connected to the connecting portion is recessed to form a second groove communicating with the first groove, and the second groove extends along the circumferential direction of the coil skeleton.

[0011] By setting a second groove and a first groove that are interconnected, the two grooves are respectively set at the end of the coil skeleton body and the root end of the buckle, so that there is no need to set a larger groove on the root end of the buckle, and the structural strength of the connection between the buckle and the coil skeleton can be ensured.

[0012] Preferably, the length of the second groove along the circumferential direction of the coil frame is greater than the length of the first groove along the circumferential direction of the coil frame. Through the above, the toughness of the connection between the buckle and the coil frame body is ensured, thereby facilitating the buckle to be opened.

[0013] Preferably, the cross-section of the circumferential inner edge formed by the connection of the first groove and the second groove is arc-shaped. The cross-section of the groove formed by the first groove and the second groove is arc-shaped, which can make the root end of the buckle more uniform when subjected to force and increase the strength of the buckle connection.

[0014] Preferably, the connecting portion includes a wide section and a narrow section in sequence from the side close to the coil skeleton body to the side away from the coil skeleton body, and the wide section is connected to the coil skeleton body.

[0015] That is, the width of the connecting section along the circumferential direction (along the direction of rotor rotation) is greater than the width of the narrow section along the circumferential direction. The narrow section allows the buckle end to bend at a larger angle after being compressed, while the wide section ensures the strength of the buckle connection structure.

[0016] Preferably, the coil skeleton body is provided with a first notch extending axially and passing radially therethrough at a root end side corresponding to the buckle, and the first notch is located at a clockwise side and / or a counterclockwise side of the buckle.

[0017] The first notch is provided to facilitate the bending of the buckle, thereby reducing the stress of the buckle when it is bent and deformed, thereby further preventing the buckle from breaking.

[0018] Preferably, an avoidance groove extending in a circumferential direction is provided on the inner wall of the connecting portion, and the avoidance groove is formed with a limiting surface flush with the supporting surface.

[0019] Through the above arrangement, the limiting surface can support the circuit board, thereby increasing the contact area with the circuit board, ensuring the snap-fit ​​fixing effect of the circuit board, and ensuring the stability of the circuit board when it is fixed.

[0020] Preferably, the coil skeleton body has a plurality of supporting protrusions extending axially, the axial surfaces of the supporting protrusions are the supporting surfaces, and a second gap penetrating inside and outside is formed between two adjacent supporting protrusions.

[0021] By providing the second notch and the protruding support protrusion, the possibility of contact between the enameled wire and the circuit board after assembly is avoided, while the creepage distance is ensured.

[0022] The present invention also provides a motor having the above-mentioned motor stator coil skeleton, including a circuit board, wherein the circuit board has a third notch at the circumferential outer edge that corresponds one-to-one with the clip, and the width of the third notch is roughly the same as the width of the end of the connecting part, and the circuit board is confined between the axial surface of the clip part and the support surface.

[0023] The width of the third notch is approximately the same as the width of the end of the connecting portion, so that the side surfaces of the connecting portion of the clip along the circumferential direction can contact the inner walls of the circuit board on opposite sides of the third notch, thereby further improving the fixing effect of the circuit board. The term "approximately the same" refers to the tolerance of the dimensions caused by processing issues, that is, the connecting portion of the clip can be a tight fit or a loose fit in the third notch.

[0024] The present invention has the advantages of being convenient for the buckle to bend under stress, facilitating the assembly of the circuit board, and preventing the buckle from breaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the coil skeleton body structure of the present invention.

[0026] Figure 2 It is a cross-sectional view of the present invention.

[0027] Figure 3 It is a structural schematic diagram of the buckle of the present invention.

[0028] Figure 4 It is a schematic diagram of the structure after the circuit board and the coil skeleton body of the present invention are assembled.

[0029] Figure 5 It is a schematic structural diagram of the circuit board of the present invention.

[0030] Figure numbers: coil skeleton body 1, axial end face 11, winding frame 12, wire blocking plate 121, first notch 2, second notch 21, buckle 3, buckle part 31, connecting part 32, narrow section 321, wide section 322, avoidance groove 33, limiting surface 331, supporting protrusion 4, first groove 51, second groove 52, circuit board 100, third notch 200. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0032] like Figure 1 and Figure 2 As shown, this embodiment discloses a motor stator coil skeleton, including a coil skeleton body 1, and an axial end face 11 on one side of the coil skeleton body 1 is used to fix the circuit board. Three annular clips 3 are provided on the axial end face 11, and the axial end face of the coil skeleton body 1 is provided with a first notch 2 extending axially and radially through the inner wall and outer wall of the coil skeleton 1 on the clockwise and counterclockwise sides of the root end of each clip 3. The axial end face 11 is provided with an axially outwardly extending support protrusion 4 on the circumferential side of each first notch 2. The axial end face of the support protrusion 4 is a support surface, which is used to support the circuit board and contact the end face of the circuit board. A second notch 21 that penetrates inside and outside is formed between two adjacent support protrusions 4. The first notch 2 and the second notch 21 are connected, and the clip 3 and the support protrusion 4 are separated by the first notch 2 and the second notch 21.

[0033] The coil bobbin body 1 is provided with an axially extending through-hole (not shown in the figure). A winding frame 12 for winding the enameled wire is provided inside the coil bobbin body 1. A wire retaining plate 121 extending axially outward is provided on one axial end face of the winding frame 12. This retaining plate 121 is an isosceles trapezoidal shape, with its circumferential width gradually decreasing from the axial inside to the axial outside. Both the retaining plate 121 and the buckle 3 are located on the same axial side of the coil bobbin body 1.

[0034] like Figure 1 and Figure 2 As shown, the buckle 3 includes a connecting portion 32 and a buckle portion 31. The connecting portion 32 extends axially outward, and the buckle portion 31 is arranged at the end of the connecting portion 32 and extends radially inward. The root of the buckle portion 31 is arranged at a 90° angle with the connecting portion 32, and the connection is a rounded transition. The axial outer side surface of the buckle portion 31 is an inclined surface, and the thickness of the buckle portion 31 gradually increases from the axial outer side to the axial inner side to form the inclined surface. The connecting portion 32 is provided with an avoidance groove 33 that opens radially inward and passes through the circumferential side walls of the connecting portion in the cylindrical direction. The avoidance groove 33 is formed with a limiting surface 331 that is flush with the support surface of the support protrusion 4. The avoidance groove 33 is located at the lower end of the buckle portion 31, and the top groove wall of the avoidance groove 33 is flush with the root end surface of the buckle portion 31. The connecting portion 32 includes a wide section 322 and a narrow section 321 from the side close to the coil skeleton to the side away from the coil skeleton. The wide section 322 is connected to the axial end face of the coil skeleton body 1, and the width of the wide section 322 along the circumferential direction of the coil skeleton is greater than the width of the narrow section 321 along the circumferential direction of the coil skeleton.

[0035] like Figure 3 As shown, the wide section 322 of the connecting portion 32 is directly connected to the axial end face 11, and a first inwardly recessed groove 51 is provided on the circumferential outer wall of the root end where the connecting portion 32 is connected to the coil skeleton body 1, so that the thickness of the connecting portion 32 offset from the coil skeleton body 1 is greater than the thickness at the root end where the connecting portion 32 is connected to the coil skeleton body. A second inwardly recessed groove 52 is provided on the circumferential outer wall of the upper end of the coil skeleton body 1. The first groove 51 and the second groove 52 both extend in the circumferential direction and are interconnected. The first groove 51 and the second groove 52 both extend in the circumferential direction of the coil skeleton and are arc-shaped; the cross-sectional shape of the circumferential inner edge formed by the connection of the first groove 51 and the second groove 52 is arc-shaped. The length of the second groove 52 in the circumferential direction is greater than the length of the first groove 51 in the circumferential direction.

[0036] like Figure 4 and Figure 5As shown, a motor including a motor stator coil skeleton includes a circuit board 100, which contacts the support surface of the support protrusion. A lateral opening is provided at the circumferential outer edge of the circuit board 100 and a third notch 200 axially penetrates the circuit board. The width of the third notch 200 is approximately the same as the width of the end of the connecting portion 32. The circuit board 100 is confined between the axial surface of the snap portion 31 and the support surface.

[0037] During use, the third notch of the circuit board is first aligned with each clip, so that the circuit board is in a horizontal position. The circuit board is then pressed downward, causing it to contact the inclined surface of the clip, causing the clip to bend radially outward. The first and second grooves guide the bending deformation of the base end of the clip. Finally, the clip portion of the clip passes through the third notch of the circuit board, and the circuit board is simultaneously locked into the clip's avoidance groove, so that the circuit board is trapped between the clip portion of the clip and the coil bobbin body.

Claims

1. A motor stator coil frame, comprising a coil frame body, characterized in that: The axial side of the coil skeleton body has a supporting surface for supporting the circuit board, and the axial side of the coil skeleton body is provided with a plurality of clips, and the clips have a clip portion located on the axial side of the supporting surface and a connecting portion connected between the clip portion and the coil skeleton body, and the thickness of the root end where the connecting portion is connected to the coil skeleton body is less than the thickness of the connecting portion deviating from the root end.

2. The motor stator coil skeleton according to claim 1, characterized in that: The radial sidewall of the root end of the connection part is recessed so that the thickness of the root end of the connection part is smaller than the thickness of the connection part at the part deviating from the root end, and the root end of the connection part forms a first groove extending along the circumferential direction of the coil skeleton.

3. The motor stator coil skeleton according to claim 2, characterized in that: The side wall of the end portion of the coil skeleton body connected to the connecting portion is recessed to form a second groove communicating with the first groove, and the second groove extends along the circumferential direction of the coil skeleton.

4. The motor stator coil skeleton according to claim 3, characterized in that: The length of the second groove along the circumferential direction of the coil skeleton is greater than the length of the first groove along the circumferential direction of the coil skeleton.

5. The motor stator coil skeleton according to claim 3, characterized in that: The cross-section of the circumferential inner edge formed by the connection of the first groove and the second groove is arc-shaped.

6. The motor stator coil bobbin according to any one of claims 1 to 5, characterized in that: The connecting portion includes a wide section and a narrow section in sequence from the side close to the coil frame body to the side far away from the coil frame body, and the wide section is connected to the coil frame body.

7. The motor stator coil bobbin according to any one of claims 1 to 5, characterized in that: The coil skeleton body is provided with a first notch extending axially and passing radially therethrough at a root end side corresponding to the buckle, and the first notch is located at a clockwise side and / or a counterclockwise side of the buckle.

8. The motor stator coil bobbin according to any one of claims 1 to 5, characterized in that: An avoidance groove extending along the circumferential direction is provided on the inner wall of the connecting portion, and the avoidance groove is formed with a limiting surface flush with the supporting surface.

9. The motor stator coil bobbin according to any one of claims 1 to 5, characterized in that: The coil frame body has a plurality of supporting protrusions extending axially, the axial surfaces of the supporting protrusions are the supporting surfaces, and a second notch penetrating inside and outside is formed between two adjacent supporting protrusions.

10. A motor having the motor stator coil bobbin according to any one of claims 1 to 9, characterized in that: It includes a circuit board, which has a third notch at the circumferential outer edge corresponding to the buckle, the width of the third notch is roughly the same as the width of the end of the connecting part, and the circuit board is confined between the axial surface of the buckle part and the support surface.

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