Stator punching sheet and permanent magnet synchronous motor

Abstract

The utility model belongs to the technical field of permanent magnet synchronous motors, and particularly relates to a stator punching sheet and a permanent magnet synchronous motor. The stator punching sheet of the utility model comprises an annular part; the 18 tooth parts are arranged on the inner side of the annular part; a winding groove is formed between every two adjacent tooth parts; wherein the shape of the winding groove tends to be trapezoid. According to the stator punching sheet provided by the utility model, the original notch is changed into a trapezoid structure from a whole circle structure, the cogging torque is reduced, the back electromotive force waveform is improved to be close to a sinusoidal waveform, and the vibration and noise of a motor are reduced; according to the permanent magnet synchronous motor, the number of the slotted holes is reduced, and each phase of copper wire is wound at an interval of two tooth parts, so that the winding copper weight is saved, the copper consumption is reduced, the efficiency is improved, and the cost is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of permanent magnet synchronous motor technology, specifically relating to a stator lamination and a permanent magnet synchronous motor. Background Technology

[0002] Permanent magnet synchronous motors have advantages such as simple structure, small size, high efficiency, and high power factor. They are already used in medium and low voltage motors in industries such as metallurgy (iron mills and sintering plants), ceramics (ball mills), rubber (internal mixers), petroleum (oil pumping units), and textiles (twisting machines and spinning frames).

[0003] See Figures 1 to 3 The existing 36-slot 12-pole permanent magnet synchronous motor has a stator slot with a fully circular structure. This results in a relatively large cogging torque and a relatively poor back electromotive force waveform, leading to relatively high vibration and noise. Furthermore, the motor uses a distributed winding scheme with a winding span of 1-4, which is relatively large, resulting in more enameled wire at the ends and relatively high copper consumption. Utility Model Content

[0004] The purpose of this invention is to provide a stator lamination and a permanent magnet synchronous motor to solve the above-mentioned technical problems.

[0005] To solve the above-mentioned technical problems, this utility model provides a stator lamination, comprising:

[0006] Annular part;

[0007] Eighteen teeth are located on the inner side of the annular portion; winding grooves are provided between adjacent teeth; among them

[0008] The shape of the winding groove tends to be trapezoidal.

[0009] In one embodiment of this application, the winding groove includes: a top edge, two side edges, and two bottom edges;

[0010] A notch is provided between the ends of the two bottom edges.

[0011] In one embodiment of this application, the width of the notch is 3 ± 0.02 mm;

[0012] The radial length of the notch is 2.5 mm.

[0013] In one embodiment of this application, a first chamfer is provided at the connection between the end of the top edge and the end of the side edge;

[0014] The radius of the first chamfer is 3mm.

[0015] In one embodiment of this application, a second chamfer is provided at the connection between the side edge and the bottom edge, and the radius of the second chamfer is 1mm;

[0016] A third chamfer is provided at the connection between the bottom edge and the side edge of the tooth end, and the radius of the third chamfer is 1mm.

[0017] In one embodiment of this application, the tooth width is 11±0.02mm.

[0018] In one embodiment of this application, the included angle between the two bottom edges is 160°.

[0019] In one embodiment of this application, the outer diameter of the annular portion is 210 mm and the inner diameter is 190 mm;

[0020] The diameter of the circle containing the center of the inner end of the tooth is 148±0.05mm.

[0021] Accordingly, this application also provides a permanent magnet synchronous motor, comprising: a stator and windings wound on the stator; wherein

[0022] The stator comprises several layers of stator laminations as described above.

[0023] In one embodiment of this application, the winding includes three-phase copper wires; each phase copper wire is wound with two teeth spaced apart.

[0024] The beneficial effects of this invention are that the stator laminations of this invention modify the original circular slot structure to a trapezoidal shape, reducing the cogging torque, increasing the back electromotive force waveform to be close to a sine wave, and reducing the vibration and noise of the motor; by reducing the number of slots and winding each phase copper wire with two teeth spaced apart, the permanent magnet synchronous motor of this invention saves the winding copper weight, reduces copper consumption, improves efficiency, and thus reduces costs.

[0025] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.

[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of an existing stator lamination;

[0029] Figure 2 This is the linear wiring diagram for an existing 36-slot 12-pole stator lamination;

[0030] Figure 3 This is the radial wiring diagram of an existing 36-slot 12-pole stator lamination;

[0031] Figure 4 This is a schematic diagram of the performance testing of an existing permanent magnet synchronous motor;

[0032] Figure 5 This is a schematic diagram of the stator lamination of this utility model;

[0033] Figure 6 This is a schematic diagram of the winding groove of the stator lamination of this utility model;

[0034] Figure 7 This is a partial dimensional schematic diagram of the stator lamination of this utility model;

[0035] Figure 8 This is a linear wiring diagram of the stator lamination of this utility model;

[0036] Figure 9 This is the radial wiring diagram of the stator lamination of this utility model;

[0037] Figure 10 This is a schematic diagram of the performance testing of the permanent magnet synchronous motor of this utility model.

[0038] In the picture:

[0039] 1. Ring-shaped part, 2. Toothed part, 3. Winding groove, 31. Top edge, 32. Side edge, 33. Bottom edge, 34. Notch, 35. First chamfer, 36. Second chamfer, 37. Third chamfer. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0041] See Figure 1 and Figure 3 The existing 36-slot 12-pole permanent magnet synchronous motor has a stator slot design with a fully circular structure. This results in a relatively large cogging torque and a relatively poor back electromotive force waveform, leading to relatively high vibration and noise. Furthermore, the motor uses a distributed winding scheme with a winding span of 1-4, which is relatively large, resulting in more enameled wire at the ends and relatively high copper losses. (See also...) Figure 4 The existing 36-slot 12-pole permanent magnet synchronous motor has a cogging torque ripple of 1.8629%, an output power of 2341.9W, an efficiency of 91.37%, and a copper weight of 2.943kg.

[0042] See Figures 5 to 7 In one embodiment of this application, the stator lamination includes: an annular portion 1; 18 teeth 2 disposed on the inner side of the annular portion 1; and a winding groove 3 disposed between adjacent teeth 2; wherein the shape of the winding groove 3 tends to be trapezoidal.

[0043] Specifically, the winding groove 3 includes a top edge 31, two side edges 32 and two bottom edges 33; a notch 34 is provided between the ends of the two bottom edges 33.

[0044] Optionally, the width of the notch 34 is 3 ± 0.02 mm; the radial length of the notch 34 is 2.5 mm.

[0045] Optionally, a first chamfer 35 is provided at the connection between the end of the top edge 31 and the end of the side edge 32; the radius of the first chamfer 35 is 3mm.

[0046] Optionally, a second chamfer 36 is provided at the connection between the side edge 32 and the bottom edge 33, and the radius of the second chamfer 36 is 1mm; a third chamfer 37 is provided at the connection between the bottom edge 33 and the side edge 32 at the end of the tooth 2, and the radius of the third chamfer 37 is 1mm.

[0047] Furthermore, the tooth width of the tooth portion 2 is 11±0.02mm.

[0048] Furthermore, the included angle between the two bottom edges 33 is 160°.

[0049] Furthermore, the outer diameter of the annular portion 1 is 210 mm and the inner diameter is 190 mm; the diameter of the circle containing the center of the inner end of the toothed portion 2 is 148 ± 0.05 mm.

[0050] Accordingly, in one embodiment of this application, the permanent magnet synchronous motor includes: a stator and windings wound on the stator; wherein the stator includes several layers of stator laminations as described above.

[0051] Further, see Figure 8 As shown in Figure 9, the winding includes three-phase copper wires; each phase copper wire is wound with two teeth spaced apart.

[0052] See Figure 10 The performance of the permanent magnet synchronous motor in this embodiment was tested. The cogging torque ripple was reduced to 0.0047%, the output power was increased to 2367.8W, the efficiency was increased to 93.087%, and the copper weight was reduced to 2.4kg.

[0053] In summary, the stator laminations and permanent magnet synchronous motor of this invention reduce cogging torque and improve the back electromotive force waveform to be closer to a sine wave by modifying the original circular slot structure to a trapezoidal shape, thereby reducing motor vibration and noise. By reducing the number of slots and winding each phase copper wire with two teeth spaced apart, the invention saves winding copper weight, reduces copper consumption, improves efficiency, and thus reduces costs.

[0054] All the devices (parts whose specific structures are not specified) selected in this application are general standard parts or parts known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0055] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0056] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and 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 should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0057] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0058] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0059] In addition, in the various embodiments of this utility model, each functional unit can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0060] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A stator lamination characterized by, It comprises: a ring part (1); 18 tooth parts (2) arranged on the inner side of the ring part (1); a wire slot (3) is arranged between adjacent tooth parts (2); wherein the shape of the wire slot (3) tends to be trapezoidal; the wire slot (3) comprises a top edge (31), two side edges (32) and two bottom edges (33); a notch (34) is arranged between the end portions of the two bottom edges (33); the width of the notch (34) is 3±0.02mm; the radial length of the notch (34) is 2.5mm.

2. The stator lamination of claim 1, wherein a first chamfer (35) is arranged at the connection between the end portion of the top edge (31) and the end portion of the side edge (32); the radius of the first chamfer (35) is 3mm.

3. The stator lamination of claim 1, wherein a second chamfer (36) is arranged at the connection between the side edge (32) and the bottom edge (33), and the radius of the second chamfer (36) is 1mm; a third chamfer (37) is arranged at the connection between the bottom edge (33) and the side edge (32) of the end portion of the tooth part (2), and the radius of the third chamfer (37) is 1mm.

4. The stator lamination of claim 1, wherein the tooth body width of the tooth part (2) is 11±0.02mm.

5. The stator lamination of claim 1, wherein the included angle between the two bottom edges (33) is 160°.

6. The stator lamination of claim 1, wherein the outer diameter of the ring part (1) is 210mm, and the inner diameter is 190mm; the diameter of the circle on which the center of the inner end of the tooth part (2) is located is 148±0.05mm.

7. A permanent magnet synchronous motor, characterized by, It comprises: a stator and a winding wound on the stator; wherein the stator comprises a plurality of layers of the stator lamination as claimed in any one of claims 1-6.

8. The permanent magnet synchronous motor of claim 7, wherein the winding comprises three-phase copper wires; each phase of copper wire is wound with an interval of two tooth parts.

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