Rotor and motor

Abstract

The utility model discloses a rotor, which comprises a first shaft section, a second shaft section, magnetic steel and a non-metal sheath, and is characterized in that the magnetic steel is arranged between the first shaft section and the second shaft section; the section of the magnetic steel along the radial direction is an axisymmetric solid magnetic steel with a limited number of symmetric axes or the section of the magnetic steel along the radial direction is an asymmetric solid magnetic steel; the nonmetal sheath comprises a first part, a second part and a third part which are sequentially connected along the axial direction; the second part is sleeved on the outer side of the magnetic steel, and the magnetic steel and the non-metal sheath synchronously rotate along the axial direction; the first part sleeves the outer side of the first shaft section, and the first shaft section and the non-metal sheath synchronously rotate in the axial direction; the third part is arranged on the outer side of the second shaft section in a sleeving mode, and the second shaft section and the non-metal sheath synchronously rotate in the axial direction. Therefore, according to the rotor, the non-metal sheath sleeves the outer side of the magnetic steel, so that the heating value of the sheath can be reduced. In addition, the solid magnetic steel has an axisymmetric cross section shape or an asymmetric cross section shape with a limited number of symmetric axes, so that torque transmission can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a rotor and a motor provided with the rotor. Background Art

[0002] With the development of modern turbine machinery, air bearings and electromagnetic bearings have been put into use, and turbine machinery has the prerequisite to reach high speed. In addition, users have higher requirements for efficiency. In order to meet user requirements, the motor design has too high speed and certain requirements for the overall volume. Usually, high-speed air compressors use gas suspension bearings, which have requirements for the outer diameter of the shaft. Usually, the rotor of a high-speed motor is built with an integrated magnetic steel structure to ensure the symmetry of the mechanical and electromagnetic properties of the permanent magnet rotor. The magnetic steel sleeve is set in the alloy sleeve, and the sleeve is connected to the magnetic steel to ensure that the sleeve can transmit torque. However, since the alloy sleeve is a conductor, it has a large heat generation, which leads to the problem of rotor overheating and magnetic steel demagnetization. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a rotor and a motor, which can solve the problem of rotor overheating and magnetic steel demagnetization caused by high heat generation of the sheath.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A rotor, comprising: a first shaft segment, a second shaft segment, a magnetic steel, and a non-metallic sheath, wherein:

[0006] The magnetic steel is arranged between the first shaft segment and the second shaft segment;

[0007] The cross section of the magnetic steel along the radial direction is an axisymmetric solid magnetic steel with a finite number of symmetry axes, or the cross section of the magnetic steel along the radial direction is an asymmetric solid magnetic steel;

[0008] The non-metallic sheath comprises a first part, a second part and a third part which are sequentially connected along the axial direction;

[0009] The second part is sleeved on the outer side of the magnetic steel, and the magnetic steel and the non-metallic sheath rotate synchronously along the axial direction;

[0010] The first part is sleeved on the outside of the first shaft section, and the first shaft section and the non-metallic sleeve rotate synchronously along the axial direction;

[0011] The third part is sleeved on the outer side of the second shaft segment, and the second shaft segment and the non-metallic sheath rotate synchronously along the axial direction.

[0012] Optionally, in the above rotor, along the radial direction, the cross-section of the inner hole of the second part is adapted to the cross-section of the magnetic steel.

[0013] Optionally, in the above rotor, the cross section of the magnetic steel along the radial direction is an axially symmetrical solid magnetic steel with two axes of symmetry, and the cross section of the solid magnetic steel along the radial direction is an ellipse.

[0014] Optionally, in the above rotor, the cross-sectional shape of the magnetic steel along the radial direction includes a rectangle and two arc segments located on both sides of the rectangle, and the length of the connecting side of the rectangle is equal to the distance between the two end points of the arc segment.

[0015] Optionally, in the above rotor, the two arc segments are identical;

[0016] Alternatively, the two arc segments are different.

[0017] Optionally, in the above rotor, along the axial direction, the first shaft segment includes a first connecting portion, and the first portion is sleeved on the first connecting portion;

[0018] Along the axial direction, the second shaft segment includes a second connecting portion, and the second portion is sleeved on the second connecting portion;

[0019] Along the radial direction, the cross section of the inner hole of the first part is adapted to the cross section of the first connecting part, and the cross section of the inner hole of the second part is adapted to the cross section of the second connecting part.

[0020] Optionally, in the above rotor, along the radial direction, the cross-sectional shape of the first connecting portion has a finite number of symmetry axes, or the cross-sectional shape of the first connecting portion is an asymmetric shape;

[0021] And / or, along the radial direction, the cross-sectional shape of the second connecting portion has a finite number of symmetry axes, or the cross-sectional shape of the second connecting portion is an asymmetric shape.

[0022] Optionally, in the above rotor, the cross-sectional shape of the first connecting portion along the radial direction is an ellipse, or the cross-sectional shape of the first connecting portion along the radial direction includes a rectangle and two arc segments located on both sides of the rectangle, and the length of the connecting side of the rectangle is equal to the distance between the two end points of the arc segment;

[0023] And / or, the cross-sectional shape of the second connecting portion along the radial direction is an ellipse, or the cross-sectional shape of the second connecting portion along the radial direction includes a rectangle and two arc segments located on both sides of the rectangle, and the length of the connecting side of the rectangle is equal to the distance between the two end points of the arc segment.

[0024] Optionally, in the above rotor, the cross-sectional shape of the first connecting portion and / or the second connecting portion along the radial direction includes a circular first region and a second region partially protruding from the first region from the inside to the outside along the radial direction.

[0025] A motor comprises the above-mentioned rotor.

[0026] It can be seen from the above technical solutions that the rotor provided by the utility model can reduce the heat generated by the sheath by means of a non-metallic sheath arranged on the outside of the magnetic steel, thereby avoiding the problem of demagnetization of the magnetic steel due to overheating of the rotor. In addition, by means of the solid magnetic steel being an axisymmetric cross-sectional shape with a limited number of symmetric axes, or an asymmetric cross-sectional shape, the transmission of torque can be ensured, and the torque of the magnetic steel can be effectively transmitted to the sheath. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A cross-sectional view of a motor provided by an embodiment of the utility model;

[0029] Figure 2 The cross-sectional structure of the rotor provided in the embodiment of the utility model is schematically shown Figure 1 ;

[0030] Figure 3 The cross-sectional structure of the rotor provided in the embodiment of the utility model is schematically shown Figure 2 .

[0031] in:

[0032] 1-first shaft section, 2-second shaft section, 3-magnetic steel, 4-non-metallic sheath. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] In the description of the utility model, it should be noted that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0035] like Figures 1 to 3 As shown, an embodiment of the utility model provides a rotor.

[0036] First, the rotor comprises a first shaft segment 1, a second shaft segment 2, a magnetic steel 3, and a non-metallic sheath 4, wherein the magnetic steel 3 is arranged between the first shaft segment 1 and the second shaft segment 2; the radial cross-section of the magnetic steel 3 is an axisymmetric solid magnetic steel with a finite number of symmetry axes, or the radial cross-section of the magnetic steel 3 is an asymmetric solid magnetic steel (that is, the effective connection with the non-metallic sheath 4 is achieved through the magnetic steel 3 with a specific cross-section, ensuring that the non-metallic sheath 4 can effectively transmit torque, so that the non-metallic sheath 4 and the magnetic steel 3 as well as the first shaft segment 1 and the second shaft segment 2 can rotate synchronously); the non-metallic sheath 4 comprises a first part, a second part and a third part connected in sequence along the axial direction; the second part is sleeved on the outer side of the magnetic steel 3, and the magnetic steel 3 and the non-metallic sheath 4 rotate synchronously along the axial direction; the first part is sleeved on the outer side of the first shaft segment 1, and the first shaft segment 1 and the non-metallic sheath 4 rotate synchronously along the axial direction; the third part is sleeved on the outer side of the second shaft segment 2, and the second shaft segment 2 and the non-metallic sheath 4 rotate synchronously along the axial direction. Since the non-metallic sheath 4 cannot be connected with the magnetic steel 3 and the first shaft section 1 and the second shaft section 2 by interference like the metal sheath to ensure the transmission of torque, the cross section of the magnetic steel 3 is limited to have a limited number of symmetric axes or an asymmetric structure. It should be noted that the cross section along the radial direction is the cross section in the direction perpendicular to the axial direction, and the specific cross-sectional shape of the magnetic steel 3 can be regular or irregular, as long as it can ensure the effective transmission of torque, and those skilled in the art can make specific designs according to actual needs.

[0037] It can be seen that the rotor provided by the embodiment of the utility model can reduce the heat generated by the sheath by sheathing the non-metallic sheath 4 on the outside of the magnetic steel 3. In addition, the solid magnetic steel is an axisymmetric cross-sectional shape with a limited number of symmetry axes, or an asymmetric cross-sectional shape, which can ensure the transmission of torque.

[0038] In specific implementation, the non-metallic sheath 4 includes PPS (polyphenylene sulfide) and glass fiber. PPS is light in weight and has a strength comparable to that of aluminum alloy, with a strength of 220Mpa, which can meet the needs of daily small machines. In addition, considering the thermal conductivity problem, glass fiber is added to increase the thermal conductivity and tensile strength of the non-metallic sheath 4.

[0039] In specific implementation, along the radial direction, the cross section of the inner hole of the second part is adapted to the cross section of the magnetic steel 3. The contact area between the inner hole of the second part and the outer wall of the magnetic steel 3 can be maximized, which is conducive to the torque being transmitted to the non-metallic sheath 4 during the rotation of the magnetic steel 3, and the force is more uniform and reasonable.

[0040] In specific implementation, the non-metallic sheath 4 is directly integrally injection-molded on the first shaft section 1 and the second shaft section 2 of the magnetic steel 3 .

[0041] For specific implementation, see Figure 2 The radial cross-section of the magnetic steel 3 is an axisymmetric solid magnetic steel with two symmetry axes. The radial cross-section shape of the solid magnetic steel is an ellipse, and salient poles are formed at both ends of the long diameter of the ellipse. This cross-sectional shape with salient poles can not only maintain the working performance of the motor, but also make the motor harmonics tend to decrease.

[0042] In a specific implementation, the cross-sectional shape of the magnetic steel 3 along the radial direction includes a rectangle and two arc segments located on both sides of the rectangle, and the length of the connecting side of the rectangle is equal to the distance between the two end points of the arc segment. The salient pole is formed by the two arc segments. This cross-sectional shape with the salient pole can not only maintain the working performance of the motor, but also reduce the harmonics of the motor.

[0043] In a specific implementation, the two arc segments are the same, that is, the cross section of the magnetic steel 3 has two symmetry axes; or the two arc segments are different, that is, the cross section of the magnetic steel 3 has no symmetry axis.

[0044] In specific implementation, along the axial direction, the first shaft section 1 includes a first connection part, and the first part is sleeved on the first connection part; along the axial direction, the second shaft section 2 includes a second connection part, and the second part is sleeved on the second connection part; along the radial direction, the cross section of the inner hole of the first part is adapted to the cross section of the first connection part, and the cross section of the inner hole of the second part is adapted to the cross section of the second connection part. The contact area between the inner hole of the first part and the inner hole of the third part and the outer wall of the magnetic steel 3 can be maximized, which is conducive to the non-metallic sheath 4 transmitting the torque to the first shaft section 1 and the second shaft section 2, and the force is more uniform and reasonable.

[0045] In specific implementation, along the radial direction, the cross-sectional shape of the first connection part has a finite number of symmetry axes, or the cross-sectional shape of the first connection part is an asymmetric figure; and / or, along the radial direction, the cross-sectional shape of the second connection part has a finite number of symmetry axes, or the cross-sectional shape of the second connection part is an asymmetric figure. Effective connection with the non-metallic sheath 4 is achieved through the first connection part and the second connection part of specific cross-sections, ensuring that the non-metallic sheath 4 can effectively transmit torque, so that the non-metallic sheath 4 can rotate synchronously with the first shaft section 1 and the second shaft section 2. It should be noted that the specific cross-sectional shapes of the first connection part and the second connection part can be designed specifically according to actual needs as long as they can play the role of transmitting torque.

[0046] In a specific implementation, the cross-sectional shape of the first connecting portion along the radial direction is an ellipse, or the cross-sectional shape of the first connecting portion along the radial direction includes a rectangle and two arc segments located on both sides of the rectangle, the length of the connecting side of the rectangle is equal to the distance between the two end points of the arc segment, and it should be noted that the two arc segments may be the same or different; and / or, the cross-sectional shape of the second connecting portion along the radial direction is an ellipse, or the cross-sectional shape of the second connecting portion along the radial direction includes a rectangle and two arc segments located on both sides of the rectangle, the length of the connecting side of the rectangle is equal to the distance between the two end points of the arc segment, and it should be noted that the two arc segments may be the same or different.

[0047] For specific implementation, see Figure 3 The first connection part and / or the second connection part have a radial cross-sectional shape including a circular first area and a second area partially protruding from the first area from the inside to the outside in the radial direction. The second area is equivalent to a stopper, which can prevent the first connection part and / or the second connection part from rotating relative to the non-metallic sheath 4, and can more effectively ensure the connection between the first connection part and / or the second connection part and the non-metallic sheath 4, and ensure the transmission of torque. It should be noted that the second area can be set to one, two or more, and when multiple second areas are set, the multiple second areas are evenly arranged along the axial direction to form a gear structure, see Figure 3 The multiple second regions may be arranged unevenly. The sizes of the multiple second regions may be consistent or inconsistent.

[0048] An embodiment of the utility model provides a motor, comprising the above-mentioned rotor.

[0049] It can be seen that the rotor of the motor provided by the embodiment of the utility model is sleeved on the outside of the magnetic steel 3 by the non-metallic sheath 4, which can reduce the heat generated by the sheath, thereby avoiding the problem of rotor overheating and demagnetization of the magnetic steel 3. In addition, by having the solid magnetic steel be an axisymmetric cross-sectional shape with a limited number of symmetry axes, or an asymmetric cross-sectional shape, the transmission of torque can be ensured, and the torque of the magnetic steel 3 can be effectively transmitted to the sheath.

[0050] In specific implementation, the motor adopts an inner rotor design. The outer diameter of the magnet 3 is 15mm and the length is 30mm. The outer diameter of the motor stator is 52mm, the inner diameter is 22mm, and the length is 30mm. The outer diameter of the whole machine is less than 60mm. The overall size is very small. The power can meet 400W operation and the speed runs at 100,000 rpm.

[0051] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0052] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0053] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rotor, characterized in that: include: A first shaft section (1), a second shaft section (2), a magnetic steel (3), and a non-metallic sheath (4), wherein: The magnetic steel (3) is arranged between the first shaft section (1) and the second shaft section (2); The cross section of the magnetic steel (3) along the radial direction is an axisymmetric solid magnetic steel with a finite number of symmetry axes, or the cross section of the magnetic steel (3) along the radial direction is an asymmetric solid magnetic steel; The non-metallic sheath (4) comprises a first part, a second part and a third part which are sequentially connected along the axial direction; The second part is sleeved on the outer side of the magnetic steel (3), and the magnetic steel (3) and the non-metallic sheath (4) rotate synchronously along the axial direction; The first part is sleeved on the outside of the first shaft section (1), and the first shaft section (1) and the non-metallic sheath (4) rotate synchronously along the axial direction; The third part is sleeved on the outside of the second shaft section (2), and the second shaft section (2) and the non-metallic sheath (4) rotate synchronously along the axial direction.

2. The rotor according to claim 1, characterized in that Along the radial direction, the cross section of the inner hole of the second part is adapted to the cross section of the magnetic steel (3).

3. The rotor according to claim 1 or 2, characterized in that: The cross section of the magnetic steel (3) along the radial direction is an axially symmetrical solid magnetic steel with two symmetry axes, and the cross section of the solid magnetic steel along the radial direction is an ellipse.

4. The rotor according to claim 1 or 2, characterized in that: The cross-sectional shape of the magnetic steel (3) along the radial direction comprises a rectangle and two arc segments located on both sides of the rectangle, and the length of the connecting side of the rectangle is equal to the distance between the two end points of the arc segment.

5. The rotor according to claim 4, characterized in that: The two arc segments are identical; Alternatively, the two arc segments are different.

6. The rotor according to claim 1, characterized in that In the axial direction, the first shaft section (1) comprises a first connecting portion, and the first portion is sleeved on the first connecting portion; Along the axial direction, the second shaft section (2) comprises a second connecting portion, and the second portion is sleeved on the second connecting portion; Along the radial direction, the cross section of the inner hole of the first part is adapted to the cross section of the first connecting part, and the cross section of the inner hole of the second part is adapted to the cross section of the second connecting part.

7. The rotor according to claim 6, characterized in that Along the radial direction, the cross-sectional shape of the first connecting portion has a finite number of symmetry axes, or the cross-sectional shape of the first connecting portion is an asymmetric shape; And / or, along the radial direction, the cross-sectional shape of the second connecting portion has a finite number of symmetry axes, or the cross-sectional shape of the second connecting portion is an asymmetric shape.

8. The rotor according to claim 7, characterized in that The cross-sectional shape of the first connecting portion along the radial direction is an ellipse, or the cross-sectional shape of the first connecting portion along the radial direction includes a rectangle and two arc segments located on both sides of the rectangle, and the length of the connecting side of the rectangle is equal to the distance between the two end points of the arc segment; And / or, the cross-sectional shape of the second connecting portion along the radial direction is an ellipse, or the cross-sectional shape of the second connecting portion along the radial direction includes a rectangle and two arc segments located on both sides of the rectangle, and the length of the connecting side of the rectangle is equal to the distance between the two end points of the arc segment.

9. The rotor according to claim 7, characterized in that The cross-sectional shape of the first connecting portion and / or the second connecting portion along the radial direction includes a circular first area and a second area partially protruding from the inside to the outside along the radial direction from the first area.

10. A motor, characterized in that: A rotor comprising any one of claims 1 to 9.

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