Stator with novel permanent magnet fixing structure

Abstract

The utility model relates to a stator with a novel permanent magnet fixing structure. The stator comprises a housing; the iron core punching sheets are stacked in the shell, each iron core punching sheet is provided with a plurality of stator teeth, and the stator teeth are provided with grooves which are formed by recessing inwards from the surfaces of the two sides and convex blocks which are located on the end faces of the stator teeth; the slot wedges are mounted between the adjacent stator teeth, one ends of the slot wedges extend into the grooves, and the other ends of the slot wedges extend out of the end surfaces of the stator teeth and correspond to the bumps; the permanent magnet extends into the space between the slot wedge and the convex block, and the permanent magnet is clamped by the slot wedge and the convex block; the grooves are formed in the stator teeth, the slot wedges are fixedly installed between the adjacent stator teeth, the permanent magnets are clamped by the slot wedges and the protruding blocks arranged at the tail ends of the stator teeth together, the permanent magnets are firmly installed in the iron core punching sheet, complex machining of the stator teeth is avoided, the machining time of the stator teeth is shortened, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of motor stator technology, and more particularly to a stator with a novel permanent magnet fixing structure. Background Technology

[0002] The fixing structure of the stator permanent magnet is a key part of motor design to ensure the stability and reliability of the permanent magnet during operation. The existing methods of fixing stator permanent magnets are mostly adhesive fixing or mechanical fixing. Adhesive fixing may age and affect long-term stability. Most manufacturers choose to fix permanent magnets by mechanical means such as bolts and slots.

[0003] Chinese patent CN218867992U discloses a stator assembly for a hybrid excitation motor. This stator assembly includes a stator yoke, stator teeth, and permanent magnets. The inner circumferential wall of the stator yoke has an assembly groove, and each assembly groove corresponds to a stator tooth. One end of each stator tooth has an assembly head that engages with the assembly groove. The assembly head of the stator tooth is fixedly installed in the corresponding assembly groove. A permanent magnet mounting through-hole is formed on each stator tooth along the radial direction of the stator yoke. Each permanent magnet mounting through-hole corresponds to a permanent magnet, which is fixedly installed in and engages with the corresponding permanent magnet mounting through-hole. However, this stator assembly requires relatively complex machining on the stator teeth. When producing larger motor stators, this significantly increases the machining time of the stator teeth, affecting production efficiency.

[0004] Therefore, it is necessary to develop a stator with a novel permanent magnet fixing structure to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a stator with a novel permanent magnet fixing structure that has high production efficiency.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a stator with a novel permanent magnet fixing structure, comprising:

[0007] shell;

[0008] Iron core laminations are stacked inside the housing. Each iron core lamination has a plurality of stator teeth. Each stator tooth has grooves formed by indentation from both sides and protrusions located on the end face of the stator tooth.

[0009] A slotted wedge is installed between adjacent stator teeth, with one end extending into the groove and the other end extending out of the stator tooth end face, corresponding to the protrusion.

[0010] A permanent magnet extends between the slot wedge and the protrusion, and the slot wedge and the protrusion clamp the permanent magnet.

[0011] Furthermore, the slot wedge includes a body, an inverted trapezoidal portion and a regular trapezoidal portion located at both ends of the body, the two sides of the inverted trapezoidal portion extending into the groove, and the regular trapezoidal portion extending out of the stator tooth end face.

[0012] Furthermore, the inverted trapezoidal portion is integrally formed with the body, and its end diameter is larger than the diameter of the end connected to the body.

[0013] Furthermore, the trapezoidal portion is integrally formed with the body, and its end diameter is larger than the diameter of the end connected to the body.

[0014] Furthermore, the body is installed between adjacent stator teeth, and its two side surfaces abut against the surfaces of the adjacent stator teeth.

[0015] Furthermore, the permanent magnet includes an upper permanent magnet portion and a lower permanent magnet portion. The diameter of the end of the upper permanent magnet portion is larger than the diameter of the end connected to the lower permanent magnet portion. The two sides of the upper permanent magnet portion abut against the sides of the protrusion and the groove wedge, respectively.

[0016] Furthermore, the diameter of the lower permanent magnet portion at its end is larger than the diameter of the end connected to the upper permanent magnet portion, and the lower permanent magnet portion extends beyond the end face of the protrusion and extends toward the center of the core lamination.

[0017] Furthermore, the shape of the groove matches a portion of the shape of the wedge, the top of the groove is flat, the bottom is sloped, and the top and bottom form an angle.

[0018] Furthermore, the two sides of the protrusion are recessed inward to form a slope, and the bottom diameter of the protrusion is larger than its top diameter.

[0019] Furthermore, the contact surfaces of the permanent magnet with the protrusion and the slot wedge are coated with adhesive.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model is a stator with a novel permanent magnet fixing structure, which has the characteristics of high production efficiency. By opening grooves in the stator teeth, the slot wedges are fixedly installed between adjacent stator teeth. The slot wedges and the protrusions set at the ends of the stator teeth together hold the permanent magnets. The permanent magnets are firmly installed inside the iron core laminations, avoiding complex processing of the stator teeth, shortening the processing time of the stator teeth, and improving production efficiency. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0022] Figure 1 This is a front view of a stator with a novel permanent magnet fixing structure according to the present invention;

[0023] Figure 2 for Figure 1 The diagram shows a stator core lamination structure with a novel permanent magnet fixing structure.

[0024] Figure 3 for Figure 2 A schematic diagram of a partial structure of the core lamination of a stator with a novel permanent magnet fixing structure is shown.

[0025] Figure 4 for Figure 1 The diagram shows a partial structural schematic of a stator with a novel permanent magnet fixing structure.

[0026] In the diagram: 1. Outer shell; 2. Core lamination; 3. Slot wedge; 4. Permanent magnet; 11. Cylinder; 12. Support; 13. Baffle; 21. Stator tooth; 22. Receiving space; 23. Groove; 24. Protrusion; 31. Body; 32. Inverted trapezoidal part; 33. Regular trapezoidal part; 41. Upper permanent magnet part; 42. Lower permanent magnet part. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please refer to Figures 1 to 4 This utility model is a stator with a novel permanent magnet fixing structure, which includes a shell 1, an iron core lamination 2 disposed inside the shell 1, a slot wedge 3 connected to the iron core lamination 2, and a permanent magnet 4 located inside the iron core lamination 2.

[0029] Please refer to Figure 1The outer casing 1 includes a cylinder 11 and a support 12 fixedly connected to the cylinder 11. The cylinder 11 is hollow inside for placing the core lamination 2. One end of the support 12 is fixedly connected to the cylinder 11, and the other end extends outward and is horizontal, supporting the cylinder 11. Both ends of the cylinder 11 are provided with baffles 13. The outer side of the baffles 13 is fixedly connected to the cylinder 11, and the inner side extends into the cylinder 11, restricting the position of the core lamination 2 inside the outer casing 1 and preventing the core lamination 2 from falling out of the outer casing 1.

[0030] Please refer to Figures 1 to 3 The number of core laminations 2 can be changed according to the requirements. Several core laminations 2 are stacked in sequence and placed inside the cylinder 11. The inside of the core laminations 2 is hollow and used to place the rotor (not shown). The outer surface of the core laminations 2 abuts and engages with the inner surface of the outer shell 1. The inner side of the core laminations 2 has several stator teeth 21. The stator teeth 21 are arranged equidistantly around the inner side of the core laminations 2. The stator teeth 21 are integrally formed with the core laminations 2 and extend toward the center of the core laminations 2. The stator teeth 21 form a receiving space 22 between the stator teeth 21. The receiving space 22 is used to wind the coil (not shown). The stator teeth 21 extend to the center of the core laminations 2 and extend to both sides to form a trapezoid to prevent the coil located in the receiving space 22 from falling out.

[0031] The stator tooth 21 has inward recesses on both sides at its end to form grooves 23. The shape of the grooves 23 matches the shape of part of the slot wedge 3. Specifically, the grooves 23 are triangular grooves with a flat top and a sloping bottom. The top and bottom of the grooves 23 form an angle. The end face of the stator tooth 21 protrudes outward to form a protrusion 24. The top of the protrusion 24 is fixedly connected to the center of the end face of the stator tooth 21. The other end extends toward the center of the core lamination 2. The two sides of the protrusion 24 are inward recesses to form sloping surfaces. The bottom diameter of the protrusion 24 is larger than its top diameter, and it is approximately dovetail-shaped.

[0032] Please refer to Figure 1 and Figure 4 The slot wedge 3 is made of non-magnetic material and includes a body 31, an inverted trapezoidal portion 32 and a regular trapezoidal portion 33 located at both ends of the body 31. The body 31 is installed between adjacent stator teeth 21, and its two side surfaces abut against the surfaces of adjacent stator teeth 21. The inverted trapezoidal portion 32 is integrally formed with the body 31, and its end diameter is larger than the diameter of the end connected to the body 31. The two sides of the inverted trapezoidal portion 32 extend into the grooves 23 of the adjacent stator teeth 21. The regular trapezoidal portion 33 is integrally formed with the body 31, and its end diameter is larger than the diameter of the end connected to the body 31. The regular trapezoidal portion 33 extends out of the end face of the stator teeth 21 and corresponds to the protrusion 24.

[0033] The permanent magnet 4 is galvanized and includes an upper permanent magnet part 41 and a lower permanent magnet part 42. The permanent magnet 41 and the lower permanent magnet 42 are integrally formed. The diameter of the end of the upper permanent magnet part 41 is larger than the diameter of the end connected to the lower permanent magnet part 42. The upper permanent magnet part 41 is located between the protrusion 24 and the slot wedge 3. Its two sides abut against the sides of the protrusion 24 and the slot wedge 3 respectively. The protrusion 24 and the slot wedge 3 hold the permanent magnet 4 from both sides of the upper permanent magnet part 41. The diameter of the end of the lower permanent magnet part 42 is larger than the diameter of the end connected to the upper permanent magnet part 41. The lower permanent magnet part 42 extends out of the end face of the protrusion 24 and extends towards the center of the core lamination 2.

[0034] In another embodiment, the contact surfaces of the permanent magnet 4 with the protrusion 24 and the slot wedge 3 are coated with adhesive.

[0035] In assembling a stator with a novel permanent magnet fixing structure, the core laminations 2 are stacked and snapped into the housing 1, and then a coil is wound in the receiving space 22. Slot wedges 3 are installed from the outside to the inside of the core laminations 2, so that the top of the slot wedges 3 extends into the grooves 23 of the adjacent stator teeth 21, and the bottom protrudes from the stator teeth 21, corresponding to the protrusions 24. Then, permanent magnets 4 are installed from the outside to the inside of the core laminations 2, with the permanent magnets 4 extending between the protrusions 24 and the slot wedges 3. The protrusions 24 and the slot wedges 3 clamp the permanent magnets 4. At the same time, according to the requirements, adhesive is applied in advance to the contact surfaces of the permanent magnets 4 with the protrusions 24 and the slot wedges 3. Finally, the baffle 13 is placed to complete the assembly.

[0036] This utility model relates to a stator with a novel permanent magnet fixing structure, which features high production efficiency. By creating grooves in the stator teeth, slot wedges are fixedly installed between adjacent stator teeth. The slot wedges, together with the protrusions at the ends of the stator teeth, clamp the permanent magnets, which are firmly installed inside the core laminations. This avoids complex processing of the stator teeth, shortens the processing time of the stator teeth, and improves production efficiency.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A stator with a novel permanent magnet fixing structure, characterized in that, It includes: Outer shell (1); Iron core laminations (2) are stacked inside the outer shell (1). The iron core laminations (2) have a plurality of stator teeth (21). The stator teeth (21) are provided with grooves (23) formed by recesses from both sides and protrusions (24) located on the end face of the stator teeth (21). The slot wedge (3) is installed between adjacent stator teeth (21), with one end extending into the groove (23) and the other end extending out of the end face of the stator tooth (21), corresponding to the protrusion (24); A permanent magnet (4) extends between the slot wedge (3) and the protrusion (24), and the slot wedge (3) and the protrusion (24) clamp the permanent magnet (4).

2. The stator with a novel permanent magnet fixing structure according to claim 1, characterized in that, The slot wedge (3) includes a body (31), an inverted trapezoidal portion (32) and a regular trapezoidal portion (33) located at both ends of the body (31). The inverted trapezoidal portion (32) extends into the groove (23) on both sides, and the regular trapezoidal portion (33) extends out of the end face of the stator tooth (21).

3. The stator with a novel permanent magnet fixing structure according to claim 2, characterized in that, The inverted trapezoidal part (32) is integrally formed with the body (31), and its end diameter is larger than the diameter of the end connected to the body (31).

4. The stator with a novel permanent magnet fixing structure according to claim 2, characterized in that, The trapezoidal part (33) is integrally formed with the body (31), and its end diameter is larger than the diameter of the end connected to the body (31).

5. The stator with a novel permanent magnet fixing structure according to claim 2, characterized in that, The body (31) is installed between adjacent stator teeth (21), and its two side surfaces abut against the surfaces of the adjacent stator teeth (21).

6. The stator with a novel permanent magnet fixing structure according to claim 1, characterized in that, The permanent magnet (4) includes an upper permanent magnet part (41) and a lower permanent magnet part (42). The diameter of the end of the upper permanent magnet part (41) is larger than the diameter of the end connected to the lower permanent magnet part (42). The two sides of the upper permanent magnet part (41) abut against the sides of the protrusion (24) and the groove wedge (3), respectively.

7. The stator with a novel permanent magnet fixing structure according to claim 6, characterized in that, The diameter of the end of the lower permanent magnet part (42) is larger than the diameter of the end connected to the upper permanent magnet part (41). The lower permanent magnet part (42) extends out of the end face of the protrusion (24) and extends toward the center of the core lamination (2).

8. The stator with a novel permanent magnet fixing structure according to claim 1, characterized in that, The shape of the groove (23) matches the partial shape of the groove wedge (3). The top of the groove (23) is a flat surface, the bottom is a slope, and the top and bottom form an angle.

9. The stator with a novel permanent magnet fixing structure according to claim 1, characterized in that, The two sides of the protrusion (24) are recessed inward to form a slope, and the bottom diameter of the protrusion (24) is larger than its top diameter.

10. The stator with a novel permanent magnet fixing structure according to claim 1, characterized in that, The contact surfaces of the permanent magnet (4) with the protrusion (24) and the slot wedge (3) are coated with adhesive.

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