Stator and permanent magnet motor with same

Abstract

The stator comprises a stator punching sheet and is characterized in that the stator punching sheet comprises at least one punching sheet body, the punching sheet body is in a circular ring shape, a hollow inner circular hole is formed in the middle of the punching sheet body, and a plurality of through grooves penetrating in the thickness direction of the punching sheet body are formed in the outer side of the inner circular hole; the punching sheet body is provided with a plurality of through grooves, the plurality of through grooves are arranged in a circumferential array around the circle center of the punching sheet body, a threading groove which enables the through groove to be communicated with the inner circular hole is formed between each through groove and the inner circular hole, a wire hanging rib is formed between every two adjacent through grooves, the outer diameter of the punching sheet body is 103mm-109mm, and the aperture of the inner circular hole is 54mm-60mm; the through groove is in an arc bottom trapezoid shape, the upper bottom and the lower bottom of the through groove are arc edges and share the same circle center with the punching sheet body, the diameter of the lower bottom is 90 mm-96 mm, and the diameter of the upper bottom is 58 mm-64 mm. The utility model has the advantages of wide power coverage range, high efficiency value, reasonable structure and simple process, and is suitable for batch production.

Description

Technical Field

[0001] The present disclosure relates to the technical field of permanent magnet motors, and in particular to a stator and a permanent magnet motor having the stator. Background Art

[0002] In the structure of permanent magnet motor, stator punching sheet is a key component. Stator punching sheet is usually a hollow annular sheet structure with an inner circular hole in the middle and multiple through slots distributed on the outside of the inner circular hole. The outer diameter of the stator punching sheet, the diameter of the inner circular hole, the shape and size of the through slot and other dimensions have a direct impact on the energy consumption, efficiency, noise and service life of the permanent magnet motor. Therefore, the design of each key dimension of the stator punching sheet is one of the important links in the production of permanent magnet motor.

[0003] In the prior art, the inner hole diameter of the permanent magnet motor is mostly 25mm~40mm, and the outer diameter is mostly 55mm~90mm. For example, patent CN208094297U discloses a stator punching sheet, a stator and a motor, in which the diameter of the stator punching sheet is 58mm and the diameter of the hollow circular hole is 30.4mm. The permanent magnet motor made of the stator punching sheet of the above size has been actually tested, and the power range it covers is 12W~150W, and the efficiency value is about 68%~72%. There are defects such as a small power range and low efficiency value, which need to be improved urgently. Utility Model Content

[0004] In order to solve the problems existing in the above-mentioned prior art, the present invention aims to provide a stator and a permanent magnet motor having the stator. The present invention has the advantages of wide power coverage and high efficiency value, reasonable structure, simple process, and is suitable for mass production.

[0005] A stator disclosed in the present invention comprises a stator punching sheet, wherein the stator punching sheet comprises at least one punching sheet body, the punching sheet body is in a circular ring shape, and has a hollow inner circular hole in the middle thereof, and a plurality of through grooves penetrating along the thickness direction of the punching sheet body are formed on the outer side of the inner circular hole, and the plurality of through grooves are arranged in a circular array around the center of the punching sheet body, and a threading groove is formed between each of the through grooves and the inner circular hole to connect the through grooves and the inner circular hole, and a wire hanging rib is formed between every two adjacent through grooves:

[0006] The outer diameter of the punch body is 103 mm to 109 mm, and the diameter of the inner hole is 54 mm to 60 mm;

[0007] The through groove is in the shape of an arc-bottom trapezoid, and both the upper and lower bottoms thereof are arc-edges and are co-centered with the punch body. The diameter of the lower bottom is 90 mm to 96 mm, and the diameter of the upper bottom is 58 mm to 64 mm.

[0008] Preferably, the outer diameter of the punch body is 105 mm to 107 mm, and the diameter of the inner circular hole is 56 mm to 58 mm.

[0009] Preferably, the diameter of the lower bottom is 92 mm to 94 mm, and the diameter of the upper bottom is 58 mm to 64 mm.

[0010] Preferably, the number of the through grooves is 9 and they are evenly distributed on the outside of the inner circular hole.

[0011] Preferably, the threading groove is a strip groove with a width of 2.9 mm to 3.1 mm.

[0012] Preferably, the width of the hanging wire rib is 7.9 mm to 8.1 mm.

[0013] Preferably, the angle formed by the midlines of two adjacent hanging ribs is 40°.

[0014] Preferably, the number of the punching sheet bodies is several, and the several punching sheet bodies are stacked and connected along the thickness direction to form the stator punching sheet.

[0015] Preferably, the thickness of the stator punching sheet is 15 mm, 20 mm, 30 mm, 40 mm or 50 mm.

[0016] A permanent magnet motor disclosed in the present invention comprises a rotor, and the permanent magnet motor further comprises the stator as described above, wherein the rotor is rotatably connected to the stator.

[0017] The stator and the permanent magnet motor with the stator described in the present invention have the advantages that the present invention designs the key parameters of the stator punching sheet, such as the outer diameter of the punching sheet body, the aperture of the inner circular hole, the shape and size of the through slot, and the permanent magnet motor using the stator punching sheet can cover a power range of 25W to 1000W under different stator punching sheet thicknesses, and the power coverage range is significantly expanded. The efficiency value can reach 77% to 83% under different powers. Compared with the same power in the prior art, the efficiency value is improved. At the same time, the structure is reasonable and the process is simple, which is suitable for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the stator punching sheet described in this embodiment.

[0019] Description of the accompanying drawings: 1-punch body, 11-inner circular hole, 12-through groove, 13-threading groove, 14-hanging rib. DETAILED DESCRIPTION

[0020] like Figure 1As shown, a stator disclosed in the present disclosure includes a stator punching sheet, and the stator punching sheet includes at least one punching sheet body 1, the punching sheet body 1 is in a hollow annular shape, and has a hollow inner circular hole 11 in the middle, and a plurality of through grooves 12 penetrating along the thickness direction of the punching sheet body 1 are formed on the outer side of the inner circular hole 11, and the plurality of through grooves 12 are arranged in a circular array around the center of the punching sheet body 1, and a threading groove 13 is formed between each through groove 12 and the inner circular hole 11 to connect the through groove 12 and the inner circular hole 11, and a wire hanging rib 14 is formed between every two adjacent through grooves 12:

[0021] The outer diameter of the punch body 1 is 103 mm to 109 mm, and the diameter of the inner hole 11 is 54 mm to 60 mm;

[0022] The through groove 12 is an arc-bottomed trapezoid, and its upper and lower bottoms are both arc edges and are cocentric with the punch body 1. The diameter of the lower bottom is 90mm~96mm, and the diameter of the upper bottom is 58mm~64mm, that is, the upper bottom is located on the side close to the center of the circle, and the lower bottom is located on the side away from the center of the circle.

[0023] In a preferred embodiment, the outer diameter of the punch body 1 is 106±1mm, the aperture of the inner circular hole 11 is 57±1mm, the number of through grooves 12 is specifically 9, and they are arranged at equal angles around the center of the punch body 1. The through grooves 12 are arc-bottomed trapezoidal, that is, the upper bottom and the lower bottom are both arcs, the diameter of the lower bottom is 93±1mm, and the diameter of the upper bottom is 61±1mm.

[0024] The threading groove 13 is a strip groove, one end of which is connected to the inner circular hole 11 and the other end of which is connected to the through groove 12, so that the through groove 12 is connected to the inner circular hole 11. The width of the threading groove 13 is 2.9 mm to 3.1 mm, preferably 3 mm.

[0025] Between every two adjacent through slots 12 is a wire hanging rib 14, the width of which is 7.9 mm to 8.1 mm, preferably 8 mm. The angle formed by the midlines of two adjacent wire hanging ribs 14 is 40°.

[0026] The power of the permanent magnet motor is mainly affected by the thickness of the stator punching sheet. In this embodiment, the number of punching sheet bodies 1 is several, and several punching sheet bodies 1 are stacked along the thickness direction and connected one by one to form a stator punching sheet. In a specific embodiment, the thickness of the stator punching sheet is 15mm, 20mm, 30mm, 40mm or 50mm to meet different power requirements.

[0027] This embodiment further provides a permanent magnet motor, including a rotor. The permanent magnet motor also includes the stator as described above, and the rotor is rotatably connected to the stator.

[0028] Experimental example

[0029] In order to verify the performance of the permanent magnet motor using the stator punching sheet described in this embodiment in terms of power coverage and efficiency, the applicant used the existing permanent magnet motor structure and the permanent magnet motor structure of this embodiment for comparative tests. In the comparative test process, except for the size of the stator punching sheet, the other structures are the same, and the following test results are obtained:

[0030] Table 1. Test results of existing permanent magnet motor power range and efficiency values

[0031]

[0032] Table 2. Test results of power range and efficiency of the permanent magnet motor of this embodiment

[0033]

[0034] It can be seen from the above test results that the permanent magnet motor using the stator punching sheets of the structure of this embodiment can cover a power range of 25W to 1000W under different stator punching sheet thicknesses, and the power coverage range is significantly expanded. The efficiency value can reach 77% to 83% under different powers. Compared with the permanent magnet motor of the same power in the prior art, the efficiency value is improved. At the same time, the structure is reasonable and the process is simple, which is suitable for mass production.

[0035] In the description of the present disclosure, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description. Unless otherwise specified, these directional words 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, and therefore cannot be understood as limiting the scope of protection of the present disclosure.

[0036] For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the protection scope of the claims of the present disclosure.

Claims

1. A stator, comprising a stator punching sheet, characterized in that: The stator punching sheet includes at least one punching sheet body, which is in a circular ring shape and has a hollow inner circular hole in the middle. A plurality of through grooves penetrating along the thickness direction of the punching sheet body are formed on the outer side of the inner circular hole. The plurality of through grooves are arranged in a circular array around the center of the punching sheet body. A threading groove is formed between each through groove and the inner circular hole to connect the through groove and the inner circular hole. A wire hanging rib is formed between every two adjacent through grooves: The outer diameter of the punch body is 103 mm to 109 mm, and the diameter of the inner hole is 54 mm to 60 mm; The through groove is in the shape of an arc-bottom trapezoid, and both the upper and lower bottoms thereof are arc-edges and are co-centered with the punch body. The diameter of the lower bottom is 90 mm to 96 mm, and the diameter of the upper bottom is 58 mm to 64 mm.

2. The stator according to claim 1, characterized in that: The outer diameter of the punch body is 105 mm to 107 mm, and the diameter of the inner circular hole is 56 mm to 58 mm.

3. The stator according to claim 1 or 2, characterized in that: The diameter of the lower bottom is 92 mm to 94 mm, and the diameter of the upper bottom is 58 mm to 64 mm.

4. The stator according to claim 1, characterized in that: The number of the through grooves is 9 and they are evenly distributed on the outer side of the inner circular hole.

5. The stator according to claim 1 or 4, characterized in that: The threading groove is a strip groove with a width of 2.9 mm to 3.1 mm.

6. The stator according to claim 1, characterized in that: The width of the hanging wire rib is 7.9 mm to 8.1 mm.

7. The stator according to claim 1 or 6, characterized in that: The included angle between the midlines of two adjacent hanging wire bars is 40°.

8. The stator according to claim 1, characterized in that: The number of the punching sheet bodies is several, and the several punching sheet bodies are stacked and connected along the thickness direction to form the stator punching sheet.

9. The stator according to claim 7, characterized in that: The thickness of the stator punching sheet is 15 mm, 20 mm, 30 mm, 40 mm or 50 mm.

10. A permanent magnet motor, comprising a rotor, characterized in that: The permanent magnet motor further comprises a stator as claimed in any one of claims 1 to 9, and the rotor is rotationally connected to the stator.

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