A core shaft of a stator core of a permanent magnet motor

Abstract

The utility model discloses a kind of core shaft of stator core outer pressure installation of permanent magnet motor, it is related to permanent magnet motor technical field, including optical axis, the outside of optical axis is fixedly welded with multiple annular array arrangement's No. welding plate, No. welding plate is equipped with sliding slot, the inside sliding connection of sliding slot has No. 2 welding plate, No. 2 welding plate is fixedly welded with arc support plate. In the utility model, optical axis, No. welding plate, No. 2 welding plate and arc support plate, commonly form a web welding core shaft, guarantee the position stress uniformity of core shaft and seamless steel pipe inside contact, so that core shaft is more not easy to deform when being subjected to external force, to extend the service life of core shaft.

Description

Technical Field

[0001] This utility model belongs to the field of permanent magnet motor technology, specifically a mandrel for externally press-fitting the stator core of a permanent magnet motor. Background Technology

[0002] The mandrel press-fitted onto the stator core of a permanent magnet motor is a crucial component of the motor's structure. The stator core, serving as the motor's skeleton, is typically constructed from stacked silicon steel sheets, possessing excellent magnetic properties and mechanical strength. Press-fitting the mandrel onto the stator core primarily enhances its structural stability, ensuring precise positioning and reducing vibration during high-speed operation. This design is essential for improving the overall performance and reliability of permanent magnet motors.

[0003] Existing stator core external press-fit mandrel designs often have some problems, such as uneven force at the contact point between the mandrel and the inside of the seamless steel tube, which makes the mandrel prone to deformation when subjected to external forces, thus shortening the service life of the mandrel. In addition, traditional mandrel designs often lack flexibility and are difficult to adapt to different types and sizes of stator cores, which to some extent limits the manufacturing efficiency and quality of permanent magnet motors. Utility Model Content

[0004] To address the problems mentioned in the background art, this utility model proposes a mandrel for externally press-fitting the stator core of a permanent magnet motor.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A stator core externally press-fitted mandrel for a permanent magnet motor includes an optical shaft. Multiple first welding plates arranged in a circular array are fixedly welded to the outer side of the optical shaft. A sliding groove is formed on the first welding plate, and a second welding plate is slidably connected inside the sliding groove. An arc-shaped support plate is fixedly welded to the second welding plate.

[0007] As a further preferred embodiment of this technical solution: a No. 1 connecting shaft is fixedly connected to the end of the optical axis, and an annular oil cylinder is provided on the outer wall of the No. 1 connecting shaft. The annular oil cylinder is connected to the No. 1 welding plate through multiple oil pipes.

[0008] As a further preferred embodiment of this technical solution: the first connecting shaft is also fixedly connected to a fixing block, a long screw is fixedly connected to the fixing block, an annular drive block is sleeved on the long screw, a second connecting shaft is fixedly connected to the annular drive block, a second piston is fixedly connected to the end of the second connecting shaft away from the annular drive block, and the second piston slides in a sealed manner inside the annular oil cylinder.

[0009] As a further preferred embodiment of this technical solution: multiple long screws are arranged in a ring array on the outside of the first connecting shaft, and the ring drive block is arranged through multiple long screws.

[0010] As a further preferred embodiment of this technical solution: each of the long screws is threaded with two nuts, and a washer is provided between each nut and the annular drive block.

[0011] As a further preferred embodiment of this technical solution: seamless steel pipes are provided on the outer sides of the plurality of arc-shaped support plates, and a buffer pad is provided between the arc-shaped support plates and the seamless steel pipes.

[0012] As a further preferred embodiment of this technical solution: the annular oil cylinder is provided with a detachable sealing cover, and the sealing cover and the annular oil cylinder are sealed together.

[0013] As a further preferred embodiment of this technical solution: a piston is provided on the bottom surface of the second welding plate, and the first piston slides in a sealed manner inside the groove.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. In this utility model, the optical axis, the first welding plate, the second welding plate, and the arc-shaped support plate together form a radial welding mandrel, which ensures that the mandrel is evenly stressed at the contact point with the inside of the seamless steel pipe, making the mandrel less prone to deformation when subjected to external forces, thereby extending the service life of the mandrel.

[0016] 2. In this utility model, the sliding connection between the No. 1 welding plate and the No. 2 welding plate, as well as the hydraulic oil drive, enables the support of stator cores of different sizes, allowing the mandrel to flexibly adjust its overall size to adapt to stator cores of different types and sizes, greatly improving the adaptability and versatility of the mandrel. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a partial three-dimensional structural schematic diagram of the present invention;

[0019] Figure 3 For the localized explosion of this utility model Figure 1 ;

[0020] Figure 4 This is a partial cross-sectional view of the present invention;

[0021] Figure 5 For the localized explosion of this utility model Figure 2 .

[0022] Legend: 1. Optical axis; 2. Welding plate No. 1; 3. Welding plate No. 2; 4. Arc-shaped support plate; 5. Piston No. 1; 6. Buffer pad; 7. Seamless steel pipe; 8. Connecting shaft No. 1; 9. Fixing block; 10. Long screw; 11. Nut; 12. Washer; 13. Annular drive block; 14. Connecting shaft No. 2; 15. Annular oil cylinder; 16. Sealing cover; 17. Piston No. 2; 18. Oil pipe; 19. Slide groove. Detailed Implementation

[0023] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and 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.

[0024] Example 1:

[0025] Please see Figures 1-5 This application provides a mandrel for external press-fitting of the stator core of a permanent magnet motor, including an optical shaft 1. Multiple first welding plates 2 arranged in a ring array are fixedly welded to the outer side of the optical shaft 1. The first welding plate 2 has a sliding groove 19. A second welding plate 3 is slidably connected inside the sliding groove 19. The first welding plate 2 and the second welding plate 3 are adjustable to support stator cores of different sizes. An arc-shaped support plate 4 is fixedly welded to the second welding plate 3 to provide the necessary conditions for supporting the inner wall of the stator core. The optical shaft 1, the first welding plate 2, the second welding plate 3 and the arc-shaped support plate 4 together form a radial welded mandrel, ensuring that the contact position between the radial welded mandrel and the inside of the seamless steel pipe 7 is uniformly stressed, making the mandrel less prone to deformation under external force and extending its service life.

[0026] In this embodiment, a first connecting shaft 8 is fixedly connected to the end of the optical axis 1. It can be driven by connecting to a drive source. An annular oil cylinder 15 is provided on the outer wall of the first connecting shaft 8 for storing hydraulic oil. The hydraulic oil is filled between the second piston 17 and the first piston 5, and there is no air present. The annular oil cylinder 15 is connected to the first welding plate 2 through multiple oil pipes 18 for conveying hydraulic oil.

[0027] In this embodiment, the first connecting shaft 8 is also fixedly connected to a fixing block 9, and a long screw 10 is fixedly connected to the fixing block 9. An annular drive block 13 is sleeved on the long screw 10. By pushing or pulling by hand, the second piston 17 slides inside the annular oil cylinder 15. The second connecting shaft 14 is fixedly connected to the annular drive block 13. The second piston 17 is fixedly connected to the end of the second connecting shaft 14 away from the annular drive block 13. The second piston 17 slides in a sealed manner inside the annular oil cylinder 15. The seal can ensure that hydraulic oil flows from one side of the second piston 17 to the other side of the second piston 17.

[0028] In this embodiment, multiple long screws 10 are arranged in a ring array on the outside of the first connecting shaft 8, and the ring drive block 13 is arranged through the multiple long screws 10.

[0029] In this embodiment, each of the long screws 10 is threaded with two nuts 11. When the annular drive block 13 is adjusted to a suitable position, the two nuts 11 are set on both sides of the annular drive block 13. By tightening the two nuts 11 respectively, the annular drive block 13 can be limited and fixed. A washer 12 is provided between each nut 11 and the annular drive block 13. The washer 12 can prevent the nuts 11 and the annular drive block 13 from loosening, so as not to affect the fit between the arc support plate 4 and the seamless steel pipe 7.

[0030] In this embodiment, seamless steel pipes 7 are provided on the outer side of the multiple arc-shaped support plates 4. The seamless steel pipes 7 can be selected according to the radius of the stator core. The outer wall radius of the seamless steel pipe 7 needs to be the same as the inner wall of the stator core. A buffer pad 6 is provided between the arc-shaped support plates 4 and the seamless steel pipes 7. By providing an elastic and flexible material, it can fill the gap between the multiple arc-shaped support plates 4 and reduce the deformation of the seamless steel pipes 7 during use.

[0031] In this embodiment, the annular oil cylinder 15 is provided with a removable sealing cover 16, and the sealing arrangement between the sealing cover 16 and the annular oil cylinder 15 allows for the replenishment of hydraulic oil and reduces the entry of dust.

[0032] In this embodiment, a piston 5 is provided on the bottom surface of the second welding plate 3, and the piston 5 slides in a sealed manner inside the groove 19. Since the second welding plate 3 is made of rigid material, its sealing performance is not good. Therefore, a flexible piston 5 that can fit against the inner wall of the first welding plate 2 is provided on the second welding plate 3 to ensure the stability of the hydraulic oil flow and prevent air leakage.

[0033] The specific operating steps are as follows: the bottom of multiple No. 1 welding plates 2 are welded to the outer wall of the optical axis 1, and the arc-shaped support plates 4 are welded to the No. 2 welding plates 3 in sequence. The outer side of the arc-shaped support plates 4 is fitted with buffer pads 6 and seamless steel pipes 7 in sequence. The length of the buffer pads 6 is slightly shorter than the length of the seamless steel pipes 7, which can fix the seamless steel pipes 7 and the arc-shaped support plates 4. Then, by driving the sealing cover 16 to move, the No. 2 connecting shaft 14 drives the No. 2 piston 17 to slide inside the annular oil cylinder 15, and the hydraulic oil is pushed into the interior of multiple No. 1 welding plates 2 along multiple oil pipes 18. The hydraulic oil then lifts the No. 1 piston 5, which can push the No. 2 welding plates 3 to move the arc-shaped support plates 4 to the outer seamless steel pipes 7. The buffer pads 6 fill the gap between the arc-shaped support plates 4 and the seamless steel pipes 7, so that the overall size of the spoke welding mandrel can be adjusted according to different types and sizes of stator cores, thereby improving the adaptability of the mandrel for external press-fitting of stator cores.

[0034] The above embodiments are only used to illustrate the technical methods of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical methods of this utility model without departing from the spirit and scope of the technical methods of this utility model.

Claims

1. A mandrel press-fitted onto the stator core of a permanent magnet motor, comprising an optical shaft (1), characterized in that: Multiple first welding plates (2) arranged in a ring array are fixedly welded to the outer side of the optical axis (1). A sliding groove (19) is provided on the first welding plate (2). A second welding plate (3) is slidably connected inside the sliding groove (19). An arc-shaped support plate (4) is fixedly welded to the second welding plate (3).

2. The mandrel externally press-fitted to the stator core of a permanent magnet motor according to claim 1, characterized in that, The end of the optical axis (1) is fixedly connected to a No. 1 connecting shaft (8). An annular oil cylinder (15) is provided on the outer wall of the No. 1 connecting shaft (8). The annular oil cylinder (15) is connected to the No. 1 welding plate (2) through multiple oil pipes (18).

3. The mandrel externally press-fitted to the stator core of a permanent magnet motor according to claim 2, characterized in that, The first connecting shaft (8) is also fixedly connected to a fixing block (9), a long screw (10) is fixedly connected to the fixing block (9), an annular drive block (13) is sleeved on the long screw (10), a second connecting shaft (14) is fixedly connected to the annular drive block (13), a second piston (17) is fixedly connected to the end of the second connecting shaft (14) away from the annular drive block (13), and the second piston (17) slides in a sealed manner inside the annular oil cylinder (15).

4. The mandrel externally press-fitted to the stator core of a permanent magnet motor according to claim 3, characterized in that, The long screws (10) are arranged in a ring array on the outside of the first connecting shaft (8), and the ring drive block (13) is arranged through the multiple long screws (10).

5. The mandrel externally press-fitted to the stator core of a permanent magnet motor according to claim 4, characterized in that, Each of the long screws (10) is threaded with two nuts (11), and a washer (12) is provided between each nut (11) and the annular drive block (13).

6. The mandrel externally press-fitted to the stator core of a permanent magnet motor according to claim 1, characterized in that, Seamless steel pipes (7) are provided on the outer side of the multiple arc-shaped support plates (4), and a buffer pad (6) is provided between the arc-shaped support plates (4) and the seamless steel pipes (7).

7. The mandrel externally press-fitted to the stator core of a permanent magnet motor according to claim 2, characterized in that, The annular oil cylinder (15) is provided with a removable sealing cover (16), and the sealing cover (16) and the annular oil cylinder (15) are sealed together.

8. The mandrel externally press-fitted to the stator core of a permanent magnet motor according to claim 1, characterized in that, The bottom surface of the second welding plate (3) is provided with a first piston (5), and the first piston (5) slides in a sealed manner inside the slide groove (19).

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