A rotor structure, electric machine

Abstract

The utility model provides a rotor structure, motor, wherein rotor structure includes: two short axle, magnetic steel and sheath, along the axial direction of short axle, magnetic steel is located between two short axle, the sheath is equipped on magnetic steel, and, at least part short axle is equipped in sheath, magnetic steel is provided with first recess towards one end of short axle, first convex is provided towards one end of short axle, first recess and first convex are opposite arrangement, limit component is arranged between first recess and first convex, and limit component is used for preventing magnetic steel and short axle relative rotation. According to the utility model, can solve the technical problem of short axle and magnetic steel easy to loosen in the heat cover process of sheath in the prior art.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, specifically relating to a rotor structure and a motor. Background Technology

[0002] High-speed permanent magnet motors are widely used in compressors, high-speed centrifuges, and other fields due to their high power density, small size, high efficiency, high reliability, low operating cost, and ability to be directly connected to the driven motor. High-speed motors have become a research hotspot in the field of motors. Because the rotational linear speed of a high-speed motor is higher than that of a conventional motor, the rotor speed of a high-speed motor is several times or even ten times that of a conventional motor. The higher rotor speed of a high-speed motor results in greater torque transmission. Therefore, to prevent loosening of the short shaft and the protective sleeve, ensuring effective fixation of the stator and rotor of the high-speed motor is crucial to improving the lifespan and reliability of the high-speed motor and the entire air compressor.

[0003] In the existing technology, the short shaft and the magnet are fixed and aligned with glue, and the sheath is heat-fitted. During the movement and heat-fitting of the sheath, the sheath and the magnet are prone to loosening or slight displacement. The magnet is not firmly fixed, which causes abnormalities. This will increase the probability of errors and waste resources during the rotor heat-fitting process.

[0004] Because of the technical problems in the existing technology, such as the short shaft and magnet being prone to loosening or displacement during the heat fitting process, this utility model studies and designs a rotor structure and motor. Utility Model Content

[0005] Therefore, this utility model provides a rotor structure and motor that can solve the technical problem in the prior art where the short shaft and magnet are easily loosened during the heat fitting process of the sheath.

[0006] To solve the above problems, this utility model provides a rotor structure, including: two short shafts, a magnet and a sheath, wherein the magnet is located between the two short shafts along the axial direction of the short shafts, the sheath is sleeved on the magnet, and at least a portion of the short shafts are sleeved inside the sheath; The magnet has a first groove at one end facing the short shaft, and the short shaft has a first protrusion at one end facing the short shaft. The first groove and the first protrusion are arranged opposite to each other, and a limiting component is provided between the first groove and the first protrusion to prevent the magnet and the short shaft from rotating relative to each other.

[0007] In some embodiments, the limiting component includes a second protrusion disposed within the first groove, the first protrusion having a second groove, and the second protrusion and the second groove being arranged opposite to each other.

[0008] In some embodiments, the limiting component includes a second protrusion disposed on the first protrusion, and a second groove is disposed within the first groove, with the second protrusion and the second groove arranged opposite to each other.

[0009] In some embodiments, the first protrusion and the first groove are trapezoidal, with the axial section of the short axis as the projection plane, and the trapezoidal arrangement of the first protrusion and the first groove is symmetrical.

[0010] In some embodiments, the limiting component includes a plurality of second protrusions, which are spaced apart on the sidewall of the first groove. A plurality of second grooves are provided on the sidewall of the first protrusion, and the second protrusions are arranged opposite to the second grooves.

[0011] In some embodiments, the limiting component includes a plurality of second protrusions, which are spaced apart on the sidewall of the first protrusion, and a plurality of second grooves are provided on the sidewall of the first groove, with the second protrusions and the second grooves arranged opposite to each other.

[0012] In some embodiments, the short shaft has a shoulder, the height of which is the same as the thickness of the sheath along the radial direction of the short shaft, and the end of the sheath abuts against the shoulder.

[0013] In some embodiments, the shoulder is provided with a plurality of second comb teeth, the second comb teeth extending axially along the short shaft and arranged sequentially along the circumference of the shoulder, and the sheath is provided with a plurality of first comb teeth, the first comb teeth arranged sequentially along the circumference of the sheath, and the first comb teeth and the second comb teeth are arranged opposite to each other.

[0014] In some embodiments, the end of the sheath is provided with a third groove that penetrates the inner wall of the sheath, and the first comb tooth is disposed at the bottom of the third groove and extends toward the short axis.

[0015] This utility model also provides an electric motor, which includes the aforementioned rotor structure.

[0016] The rotor structure and motor provided by this utility model have the following beneficial effects: The first groove and the first protrusion achieve alignment between the short shaft and the magnet. The limiting component prevents relative rotation between the magnet and the short shaft, thus ensuring a stable circumferential connection between the short shaft and the magnet. This avoids loosening of the magnet and the short shaft during the assembly of the sheath, preventing assembly errors and wasted resources. This further simplifies the assembly process and improves the rotor's assembly efficiency. Attached Figure Description

[0017] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0018] Figure 1 This is an assembly structure diagram of the rotor structure of this utility model; Figure 2 This is a schematic diagram of the short shaft in the rotor structure of this utility model. Figure 1 ; Figure 3 This is a schematic diagram of the short shaft in the rotor structure of this utility model. Figure 2 ; Figure 4 This is a schematic diagram of the magnet structure in the rotor structure of this utility model. Figure 1 ; Figure 5 This is a schematic diagram of the magnet structure in the rotor structure of this utility model. Figure 2 ; Figure 6 This is a schematic diagram of the sheath structure in the rotor structure of this utility model. Figure 1 ; Figure 7 This is a schematic diagram of the sheath structure in the rotor structure of this utility model. Figure 2 .

[0019] The attached figures are labeled as follows: 1. Short shaft; 2. Magnet; 3. First comb tooth; 4. Sheath; 5. First protrusion; 6. First groove; 7. Second groove; 8. Second comb tooth; 9. Second protrusion. Detailed Implementation

[0020] 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. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0021] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0022] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0023] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0024] See also Figure 1-7 As shown, according to an embodiment of the present invention, a rotor structure is provided, comprising: two short shafts 1, a magnet 2 and a sheath 4. Along the axial direction of the short shafts 1, the magnet 2 is located between the two short shafts 1, the sheath 4 is sleeved on the magnet 2, and at least a portion of the short shafts 1 are sleeved within the sheath 4. The magnet 2 has a first groove 6 at one end facing the short shaft 1, and the short shaft 1 has a first protrusion 5 at one end facing the short shaft 1. The first groove 6 and the first protrusion 5 are arranged opposite to each other. A limiting component is provided between the first groove 6 and the first protrusion 5. The limiting component is used to prevent the magnet 2 and the short shaft 1 from rotating relative to each other.

[0025] In this technical solution, the alignment between the short shaft 1 and the magnet 2 is achieved through the first groove 6 and the first protrusion 5. The limiting component is used to prevent the magnet 2 and the short shaft 1 from rotating relative to each other, thereby ensuring a stable circumferential connection between the short shaft 1 and the magnet 2. This avoids loosening of the magnet 2 and the short shaft 1 during the assembly of the sheath 4, which could lead to assembly errors and wasted resources. This further simplifies the assembly steps and improves the assembly efficiency of the rotor.

[0026] In some embodiments, the limiting component includes a second protrusion 9 disposed within the first groove 6, and the first protrusion 5 is provided with a second groove 7, with the second protrusion 9 and the second groove 7 arranged opposite to each other.

[0027] In some embodiments, the limiting component includes a second protrusion 9 disposed on the first protrusion 5, and a second groove 7 is disposed in the first groove 6, with the second protrusion 9 and the second groove 7 arranged opposite to each other.

[0028] In this technical solution, by setting a second protrusion 9 in the first groove 6 or on the first protrusion 5, and setting a second groove 7 on the first groove 6 or on the first protrusion 5, the second protrusion 9 and the second groove 7 form an insertion structure, thereby limiting the circumferential movement of the short shaft 1 and the magnet 2, preventing the short shaft 1 and the magnet 2 from rotating relative to each other, and ensuring the stability of the short shaft 1 and the magnet 2 when the sheath 4 is assembled.

[0029] In some embodiments, the second protrusion 9 and the second groove 7 may be disposed at the bottom of the first groove 6 and the end of the first protrusion 5, thereby forming a plug-in structure.

[0030] In some embodiments, the first protrusion 5 and the first groove 6 are trapezoidal, with the axial section of the short axis 1 as the projection plane, and the trapezoidal arrangement of the first protrusion 5 and the first groove 6 is symmetrical.

[0031] In this technical solution, the short side of the trapezoidal first protrusion 5 faces the magnet 2, and the short side of the first groove 6 is located at the bottom of the groove. This prevents the short shaft 1 from being misaligned or shifted from the magnet 2 during the hot fitting process of the rotor. The structure is simple and the two can be aligned by themselves, reducing the difficulty of hot fitting and assembly.

[0032] In some embodiments, the limiting component includes a plurality of second protrusions 9, which are spaced apart on the sidewall of the first groove 6. A plurality of second grooves 7 are provided on the sidewall of the first protrusion 5, and the second protrusions 9 are arranged opposite to the second grooves 7.

[0033] In some embodiments, the limiting component includes a plurality of second protrusions 9, which are spaced apart on the sidewall of the first protrusion 5, and a plurality of second grooves 7 are provided on the sidewall of the first groove 6, with the second protrusions 9 and the second grooves 7 arranged opposite to each other.

[0034] In this technical solution, a second protrusion 9 is provided on the side wall of the first groove 6 or the side wall of the first protrusion 5, and a second groove 7 is provided on the side wall of the first groove 6 or the side wall of the protrusion 5. Since the first protrusion 5 and the first groove 6 are trapezoidal, the first protrusion 5 and the first groove 6 can be quickly fixed under the guidance of the trapezoidal inclined surface. It should be noted that the first protrusion 5 extends to the ends of the first groove 6 and the first protrusion 5 facing each other and is flush with the ends. The first groove 6 needs to penetrate the ends of the first groove 6 and the first protrusion 5 facing each other, thereby limiting the circumferential movement of the short shaft 1 and the magnet 2, preventing the short shaft 1 and the magnet 2 from rotating relative to each other, and ensuring the stability of the short shaft 1 and the magnet 2 when the sheath 4 is assembled.

[0035] In some embodiments, the short shaft 1 has a shoulder, the height of which is the same as the thickness of the sheath 4 along the radial direction of the short shaft 1, and the end of the sheath 4 abuts against the shoulder.

[0036] In this technical solution, the height of the shaft shoulder is the same as the thickness of the sheath 4, and the end of the sheath 4 abuts against the shaft shoulder, thereby limiting the axial movement of the sheath 4 and fixing the sheath between the two short shafts 1 to ensure the stability of the sheath 4.

[0037] In some embodiments, a plurality of second comb teeth 8 are provided on the shoulder, the second comb teeth extend along the axial direction of the short shaft 1, the second comb teeth 8 are arranged sequentially along the circumference of the shoulder, and a plurality of first comb teeth 3 are provided on the sleeve 4, the first comb teeth 3 are arranged sequentially along the circumference of the sleeve 4, and the first comb teeth 3 are arranged opposite to the second comb teeth 8.

[0038] In this technical solution, the first comb tooth 3 and the second comb tooth 8 are arranged opposite to each other, and the first comb tooth 3 and the second comb tooth 8 form a tooth-shaped locking. The comb tooth structure is similar to the gear comb tooth structure. After the tooth grooves are interlocked, the contact area between the sheath 4 and the short shaft 1 increases, and the rotor is more secure and difficult to loosen during high-speed operation.

[0039] The rotor structure of this utility model uses a three-section shaft heat-shrink method to lock the front short shaft in a way that is perpendicular to the magnet and fixed together with the front short shaft. The sheath locks the front and rear short shafts and the magnet together, and the four components are tightly assembled together. This solution ensures the safety, reliability and lifespan of the rotor during the trial production process.

[0040] The rotor structure of this utility model solves the problems of unstable fixation caused by the current method of fixing the short shaft and magnet with glue, which makes it easy for the sheath and magnet to loosen or undergo slight displacement during the movement and heat fitting of the sheath. This results in an increased probability of errors and wasted resources during the rotor heat fitting process. The new model also solves the problems of simple assembly, increased trial production efficiency and cost savings.

[0041] The rotor structure of this invention is based on a short shaft, magnets, and a sheath. The short shaft can be fixed by self-alignment between the short shaft and the magnets, and the short shaft and magnets can also be automatically aligned. This ensures the reliability of the rotor during assembly. Through this self-alignment scheme, the rotor effectively reduces assembly difficulty and prevents loosening of the front and rear short shafts and sheath at high temperatures. The structure is simple, easy to process and assemble, and requires no special or high-precision precision.

[0042] In some embodiments, the end of the sheath 4 is provided with a third groove, the third groove penetrates the inner wall of the sheath 4, the first comb tooth 3 is disposed at the bottom of the third groove, and the first comb tooth 3 extends toward the short axis 1.

[0043] In this technical solution, the design space for the first comb tooth 3 is provided by the third groove, thereby realizing the tooth shape locking between the first comb tooth 3 and the second comb tooth 8.

[0044] In some embodiments, the sheath 4 is interference-fitted with the magnet 2 and the short shaft 1. The interference fit connection provides high reliability and helps to improve the reliability and safety of motor operation.

[0045] It should be noted that the toothed locking method is more suitable for high-speed motor rotors, where only one axial locking force is needed. The sheath itself is an interference fit, and it is heated to over 600 degrees Celsius and quickly hot-installed into the short shaft. After cooling for a short time, it automatically locks the front and rear short shafts and magnets. This structure is simple to process and has high reliability. In contrast, the threaded connection method is more complex to process and has lower reliability.

[0046] The rotor structure of this utility model is suitable for the design of high-speed motor rotors. It can not only improve the service life of the rotor, but also prevent the rotor from loosening with the protective sleeve and the front and rear short shafts when it is running at high speed. Therefore, the design of the protective sleeve and short shaft tooth locking scheme combines the stability of the rotor during operation and the improvement of motor performance.

[0047] This utility model also provides an electric motor, including the rotor structure described above.

[0048] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0049] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A rotor structure, characterized in that: include: Two short shafts (1), a magnet (2) and a sleeve (4) are arranged along the axial direction of the short shafts (1), the magnet (2) is located between the two short shafts (1), the sleeve (4) is fitted on the magnet (2), and at least part of the short shafts (1) is fitted inside the sleeve (4); The magnet (2) has a first groove (6) at one end facing the short shaft (1), and the short shaft (1) has a first protrusion (5) at one end facing the short shaft (1). The first groove (6) and the first protrusion (5) are arranged opposite to each other. A limiting component is provided between the first groove (6) and the first protrusion (5). The limiting component is used to prevent the magnet (2) and the short shaft (1) from rotating relative to each other.

2. The rotor structure according to claim 1, characterized in that: The limiting component includes a second protrusion (9), which is disposed in the first groove (6). The first protrusion (5) is provided with a second groove (7), and the second protrusion (9) and the second groove (7) are arranged opposite to each other.

3. The rotor structure according to claim 1, characterized in that: The limiting component includes a second protrusion (9), which is disposed on the first protrusion (5). A second groove (7) is disposed in the first groove (6), and the second protrusion (9) and the second groove (7) are arranged opposite to each other.

4. The rotor structure according to claim 1, characterized in that: With the axial section of the short axis (1) as the projection plane, the first protrusion (5) and the first groove (6) are trapezoidal, and the trapezoidal arrangement of the first protrusion (5) and the first groove (6) is symmetrical.

5. The rotor structure according to claim 4, characterized in that: The limiting component includes a plurality of second protrusions (9), which are spaced apart on the sidewall of the first groove (6). A plurality of second grooves (7) are provided on the sidewall of the first protrusion (5), and the second protrusions (9) and the second grooves (7) are arranged opposite to each other.

6. The rotor structure according to claim 4, characterized in that: The limiting component includes a plurality of second protrusions (9), which are spaced apart on the sidewall of the first protrusion (5). A plurality of second grooves (7) are provided on the sidewall of the first groove (6), and the second protrusions (9) and the second grooves (7) are arranged opposite to each other.

7. The rotor structure according to claim 1, characterized in that: The short shaft (1) has a shoulder, and the height of the shoulder is the same as the thickness of the sleeve (4) along the radial direction of the short shaft (1). The end of the sleeve (4) abuts against the shoulder.

8. The rotor structure according to claim 1, characterized in that: Multiple second comb teeth (8) are provided on the shoulder, the second comb teeth extend along the axial direction of the short shaft (1), the second comb teeth (8) are arranged sequentially along the circumference of the shoulder, and multiple first comb teeth (3) are provided on the sleeve (4), the first comb teeth (3) are arranged sequentially along the circumference of the sleeve (4), and the first comb teeth (3) are arranged opposite to the second comb teeth (8).

9. The rotor structure according to claim 5, characterized in that: The end of the sheath (4) is provided with a third groove, which penetrates the inner wall of the sheath (4). The first comb tooth (3) is provided at the bottom of the third groove and extends toward the short shaft (1).

10. An electric motor, characterized in that: The rotor structure includes any one of claims 1-9.

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