Rotor structure and motor

Abstract

The present application generally relates to the field of motor technology, and specifically, to a rotor structure and a motor, wherein the rotor structure comprises an iron core, a sleeve, and a plurality of magnets installed on the iron core, wherein the iron core is provided with a magnet groove and an air groove located inside the magnet groove, the magnet is installed in the magnet groove, and the sleeve is sleeved between the magnet and the air groove so that the magnet is squeezed and fixed on the wall surface of the magnet groove facing the axis of the iron core. When the rotor structure rotates, the magnet is subjected to centrifugal force, and the sleeve exerts an extrusion force on the magnet, and the extrusion force is opposite to the direction of the centrifugal force. The sleeve can effectively prevent the magnet from being deformed or even damaged due to excessive centrifugal force, effectively reduce the deformation amount of the magnet caused by stress during the high-speed operation of the built-in rotor, protect the safety of the rotor structure, further improve the maximum safe speed of the rotor structure, and increase the power density of the motor.

Description

Technical Field

[0001] The present application generally relates to the field of motor technology, and in particular, to a rotor structure and a motor. Background Art

[0002] As the country vigorously promotes industrial upgrading, motors will continue to develop towards high speed and miniaturization. The field of high-speed motors generally adopts surface-mount and built-in rotor structures.

[0003] As the motor speed increases, the centrifugal force on each part of the rotor becomes greater. Due to the different material properties of the various components of the built-in rotor, the magnetic steel and the rotor core will rupture when the stress exceeds the limit. The use of a high-strength alloy sheath on the outer surface of the core does not greatly improve the structural strength of the built-in rotor. Due to the tension required during the winding process of the carbon fiber sheath, the protective effect of the carbon fiber sheath wrapped circumferentially on the outer side of the core on the built-in core is also very limited. Summary of the invention

[0004] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Application does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0005] In order to improve the structural strength of the magnetic steel in the rotor core, the main purpose of the present application is to provide a rotor structure and a motor.

[0006] In order to achieve the above invention objectives, this application adopts the following technical solutions:

[0007] A rotor structure comprises an iron core, a sheath and a plurality of magnetic steels installed on the iron core, wherein the iron core is provided with a magnetic steel slot and an air slot located inside the magnetic steel slot;

[0008] The magnetic steel is installed in the magnetic steel slot, and the sheath is set between the magnetic steel and the air slot, so that the magnetic steel is squeezed and fixed on the wall surface of the magnetic steel slot facing the core axis.

[0009] Furthermore, in some embodiments of the present solution, the rotor structure further includes a rotating shaft and a baffle that is interference fit with the rotating shaft, and the baffles are respectively arranged on both sides of the axial direction of the iron core.

[0010] Furthermore, in some embodiments of the present solution, the baffle is provided with a first connection hole and a second connection hole for connecting with the sheath.

[0011] Furthermore, in some embodiments of the present solution, the first connecting hole corresponds to the air slot, and the second connecting hole corresponds to the gap formed between the side of the magnetic steel slot away from the rotating shaft and the magnetic steel.

[0012] Furthermore, in some embodiments of the present solution, the above-mentioned sheath includes a carbon fiber tape wound between the magnetic steel and the air slot.

[0013] Furthermore, in some embodiments of the present solution, the magnetic steel slot includes a first curved wall and a second curved wall, and the first curved wall and the second curved wall are relatively arranged on both sides of the magnetic steel slot in the circumferential direction of the iron core.

[0014] Furthermore, in some embodiments of the present solution, there is a gap between the first curved wall, the second curved wall and the magnetic steel.

[0015] Furthermore, in some embodiments of the present solution, the magnetic steel and the air slot are respectively coated with an adhesive for bonding with the sheath.

[0016] Furthermore, in some embodiments of the present solution, the iron core is provided with shoulders on both sides of the magnetic steel slot in the circumferential direction of the iron core.

[0017] A motor is provided with the rotor structure mentioned above.

[0018] It can be seen from the above technical solutions that the advantages and positive effects of the rotor structure and motor of the present application are:

[0019] It effectively reduces the deformation of the magnetic steel caused by stress during the high-speed operation of the built-in rotor, protects the safety of the rotor structure, further improves the maximum safe speed of the rotor structure, and increases the power density of the motor.

[0020] The rotor structure includes an iron core, a sleeve and a plurality of magnets installed on the iron core. The iron core is provided with a magnet groove and an air groove located inside the magnet groove. The magnet is installed in the magnet groove. The sleeve is sleeved between the magnet and the air groove so that the magnet is squeezed and fixed on the wall of the magnet groove facing the axis of the iron core. When the rotor structure rotates, the magnet is subjected to centrifugal force, and the sleeve exerts an extrusion force on the magnet. The extrusion force is opposite to the direction of the centrifugal force. The sleeve can effectively prevent the magnet from being deformed or even damaged due to excessive centrifugal force. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0022] In order to more clearly illustrate the embodiments of the present invention 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, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0023] Figure 1 is a schematic cross-sectional view showing a rotor structure according to an exemplary embodiment.

[0024] Figure 2 It is a schematic diagram of a partial structure of a rotor structure according to an exemplary embodiment.

[0025] Figure 3 is a schematic diagram of a baffle structure of a rotor structure according to an exemplary embodiment.

[0026] The reference numerals are described as follows:

[0027] 100-iron core; 200-sheath; 300-rotating shaft; 400-magnetic steel; 500-first baffle; 600-second baffle;

[0028] 110 - magnetic steel slot; 120 - first air slot; 130 - second air slot; 111 - first curved wall; 112 - second curved wall;

[0029] 510 - first connecting hole; 520 - second connecting hole. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0031] The present invention provides a rotor structure and a motor. The motor is a high-speed permanent magnet motor. The magnetic steel 400 of the rotor structure is installed in a built-in manner. The rotor structure includes an iron core 100, a sheath 200, a rotating shaft 300 sleeved with the iron core 100, and a plurality of magnetic steels 400. The iron core 100 is provided with a magnetic steel slot 110 for accommodating the magnetic steel 400. The iron core 100 is provided with an axially through air slot between the magnetic steel slot 110 and the rotating shaft 300, that is, the air slot is located on the inner side of the magnetic steel slot 110. The sheath 200 is sleeved between the magnetic steel 400 and the rotating shaft 300. The sleeve 200 is used to squeeze and fix the magnetic steel 400 on the side of the magnetic steel slot 110 facing the rotating shaft 300. When the rotor structure rotates, the magnetic steel 400 is subjected to centrifugal force, and the sleeve 200 applies an extrusion force to the magnetic steel 400, and the extrusion force is opposite to the direction of the centrifugal force. The sleeve 200 prevents the magnetic steel 400 from being deformed or even damaged due to excessive centrifugal force, effectively reduces the deformation amount of the magnetic steel 400 caused by stress during the high-speed operation of the built-in rotor, protects the safety of the rotor structure, further improves the maximum safe speed of the rotor structure, and increases the power density of the motor.

[0032] In this solution, an air groove is opened on the side of the magnetic steel groove 110 facing the rotating shaft 300 of the iron core 100, and a sleeve 200 is arranged between the air groove and the magnetic steel groove 110. The magnetic steel 400 is arranged in the sleeve 200. The sleeve 200 squeezes the magnetic steel 400 and is fixed on the side of the magnetic steel groove 110 facing the rotating shaft 300. The tensile strength of the sleeve 200 is greater than the tensile strength of the silicon steel sheet of the iron core 100. In this solution, the sleeve 200 can be made of carbon fiber material.

[0033] like Figure 1-3 As shown, the rotor structure includes an iron core 100, a sleeve 200, a rotating shaft 300, a magnetic steel 400, a first baffle 500 and a second baffle 600; the iron core 100, the first baffle 500 and the second baffle 600 are respectively sleeved with the rotating shaft 300, and the iron core 100, the first baffle 500 and the second baffle 600 are respectively interference fit with the rotating shaft 300, the first baffle 500 and the second baffle 600 are made of magnetic isolation material, the first baffle 500 and the second baffle 600 are respectively arranged at both ends of the iron core 100 in the axial direction, and the first baffle 500 and the second baffle 600 are respectively fitted with the iron core 100.

[0034] Combination Figure 1In this solution, the iron core 100 is formed by stacking a plurality of silicon steel sheets. The iron core 100 is provided with a plurality of magnetic steel slots 110 that penetrate axially. The plurality of magnetic steel slots 110 are evenly distributed along the axis of the iron core 100, and each magnetic steel slot 110 is installed with a magnetic steel 400. The iron core 100 is also provided with air slots that penetrate the iron core 100 axially. The number of air slots is the same as the number of magnetic steel slots 110, that is, each magnetic steel slot 110 is provided with an air slot on the side facing the rotating shaft 300. In this embodiment, the air slot located between the magnetic steel slot 110 and the rotating shaft 300 is defined as a first air slot 120. After the magnetic steel 400 is installed in the magnetic steel slot 110, the magnetic steel 400 adheres to the wall of the magnetic steel slot 110 on the side close to the rotating shaft 300, and a gap is formed between the wall of the magnetic steel slot 110 on the side away from the rotating shaft 300 and the magnetic steel slot 110, and the gap is defined as a second air slot 130.

[0035] The first baffle plate 500 and the second baffle plate 600 are respectively provided with connection holes for communicating with the first air groove 120 and the second air groove 130. In this solution, the first baffle plate 500 and the second baffle plate 600 have the same structure, so only the structure of the first baffle plate 500 is described. Figure 3 As shown, the first baffle plate 500 is provided with a first connecting hole 510 and a second connecting hole 520, the first connecting hole 510 corresponds to the first air slot 120, and the second connecting hole 520 corresponds to the gap between the side of the magnetic steel slot 110 away from the rotating shaft 300 and the magnetic steel 400, that is, the second connecting hole 520 corresponds to the second air slot 130, which facilitates the sleeve 200 to pass through the first baffle plate 500 and the second baffle plate 600, and the number of the first connecting holes 510, the number of the second connecting holes 520, the number of the magnetic steel slots 110 and the number of the first air slots 120 are all the same.

[0036] In this embodiment, when the sleeve 200 is an integral structure, the sleeve 200 can be cut off before installation, and one end of the sleeve 200 passes through the first connecting hole 510 of the first baffle 500, the first air groove 120, the first connecting hole 510 of the second baffle 600, the second connecting hole 520 of the second baffle 600, the second air groove 130 and the second connecting hole 520 of the first baffle 500 in sequence. Finally, the two ends of the cut portion of the sleeve 200 are connected, and the sleeve 200 squeezes the magnet 400 to fit the wall of the magnet groove 110 close to the rotating shaft 300. The sleeve 200 applies a squeezing force to the magnet 400, which can effectively prevent the magnet 400 from being deformed or even damaged due to excessive centrifugal force.

[0037] Under the understanding of those skilled in the art, in this solution, the sheath 200 can also be composed of carbon fiber tapes. The carbon fiber tapes are arranged by axial winding. The carbon fiber tapes sequentially pass through the first connection hole 510 of the first baffle 500, the first air groove 120, the first connection hole 510 of the second baffle 600, the second connection hole 520 of the second baffle 600, the second air groove 130, and the second connection hole 520 of the first baffle 500 to complete one layer of winding of the carbon fiber tapes. The number of winding times of the carbon fiber tapes can be determined according to the thickness of the sheath 200. During the winding process of the carbon fiber tapes, the tension is kept consistent. After the winding is completed, the carbon fiber tapes are heated to shape the carbon fiber tapes. After the carbon fiber tapes are cooled, the installation of the sheath 200 is completed.

[0038] As Figure 2 , in this solution, the magnet groove 110 has a first curved wall 111 and a second curved wall 112. The first curved wall 111 and the second curved wall 112 are oppositely arranged on both sides of the magnet groove 110 in the circumferential direction of the iron core 100. There are gaps between the first curved wall 111 and the second curved wall 112 and the magnet 400 respectively. The iron core 100 is provided with shoulders on both sides of the magnet groove 110 in the circumferential direction of the iron core 100.

[0039] Define the pressure of the sheath 200 on the magnet 400 at static as F1. When the rotor structure rotates, the centrifugal force received by the magnet 400 is defined as F 2 , the extrusion force received by the wall surface on the side of the magnet groove 110 away from the rotating shaft 300 is: k(F 2 -F 1 ) where 0 < k < 1, and k is determined by the structural characteristics of the sheath 200.

[0040] Since the sheath 200 applies an extrusion force on the magnet 400 towards the rotating shaft 300, the extrusion force of the magnet 400 on the wall surface on the side of the magnet groove 110 away from the rotating shaft 300 is reduced. The first curved wall 111 and the second curved wall 112 disperse the internal stress of the iron core 100, improve the structural strength of the iron core 100, ensure the safety of the rotor structure, further increase the ultimate safety speed of the rotor structure, and increase the motor power density.

[0041] The present solution also provides a motor, which is equipped with the above-mentioned rotor structure. The rotor structure includes an iron core 100, a sheath 200, a rotating shaft 300, a magnetic steel 400, a first baffle 500 and a second baffle 600. The iron core 100 is provided with a magnetic steel slot 110 for accommodating the magnetic steel 400. The iron core 100 is provided with an axially penetrating air slot between the magnetic steel slot 110 and the rotating shaft 300. In this embodiment, the air slot is defined as a first air slot 120. The first air slot 120 The magnetic steel 400 is arranged near the magnetic steel slot 110, and the magnetic steel 400 is installed in the magnetic steel slot 110. The magnetic steel 400 is in contact with the wall surface of the magnetic steel slot 110 on the side close to the rotating shaft 300, and the magnetic steel 400 forms a gap with the wall surface of the magnetic steel slot 110 on the side away from the rotating shaft 300. The gap is defined as the second air slot 130. The first air slot 120 and the second air slot 130 respectively penetrate the iron core 100 axially, and the first baffle 500 and the second baffle 600 are respectively located on both sides of the axial direction of the iron core 100. The first baffle plate 500 and the second baffle plate 600 respectively correspond to the first air slot 120 and the second air slot 130 to open connecting holes, the sleeve 200 is axially sleeved between the first air slot 120 and the second air slot 130, and the sleeve 200 is partially sleeved on the first baffle plate 500 and the second baffle plate 600 through the connecting holes, the sleeve 200 applies an extrusion force to the magnetic steel 400, and the extrusion force is opposite to the direction of the centrifugal force. The sleeve 200 prevents the magnetic steel 400 from being deformed or even damaged due to excessive centrifugal force, effectively reduces the deformation amount of the magnetic steel 400 caused by stress during the high-speed operation of the built-in rotor, protects the safety of the rotor structure, further improves the limit safety speed of the rotor structure, and increases the power density of the motor. Since the sleeve 200 applies an extrusion force toward the shaft 300 to the magnetic steel 400, the wall surface of the magnetic steel slot 110 away from the shaft 300 is subjected to the extrusion force of the magnetic steel 400, which improves the structural strength of the iron core 100 and ensures the safety of the rotor structure.

[0042] It should be noted that, in this article, relational terms such as "first" and "second" 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 existence of other identical elements in the process, method, article or device including the elements.

[0043] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement 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 rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A rotor structure, It is characterized in that It comprises an iron core (100), a sheath (200), and a plurality of magnetic steels (400) mounted on the iron core (100); the iron core (100) is provided with a magnetic steel slot (110) and an air slot located inside the magnetic steel slot (110); The magnetic steel (400) is installed in the magnetic steel slot (110), and the sheath (200) is sleeved between the magnetic steel (400) and the air slot, so that the magnetic steel (400) is pressed and fixed on the wall surface of the magnetic steel slot (110) facing the axis of the iron core (100); The rotor structure further comprises a rotating shaft (300) and a baffle which is interference-fitted with the rotating shaft (300); the baffles are respectively arranged on both sides of the iron core (100) in the axial direction; the magnetic steel (400) is coated with an adhesive for bonding with the sleeve (200); the baffle is provided with a first connection hole (510) and a second connection hole (520) for connecting with the sleeve (200); the first connection hole (510) corresponds to the air slot, and the second connection hole (520) corresponds to a gap formed between a side of the magnetic steel slot (110) away from the rotating shaft (300) and the magnetic steel (400).

2. The rotor structure according to claim 1, It is characterized in that The sheath (200) comprises a carbon fiber tape wound between the magnetic steel (400) and the air slot.

3. The rotor structure according to claim 1, It is characterized in that The magnetic steel slot (110) comprises a first curved wall (111) and a second curved wall (112), wherein the first curved wall (111) and the second curved wall (112) are arranged relatively on two sides of the magnetic steel slot (110) in a circumferential direction of the iron core (100).

4. The rotor structure according to claim 3, It is characterized in that There is a gap between the first curved wall (111), the second curved wall (112) and the magnetic steel (400).

5. The rotor structure according to claim 1, It is characterized in that The air groove is coated with an adhesive for bonding with the sheath (200).

6. The rotor structure according to claim 1, It is characterized in that The iron core (100) is provided with shoulders on both sides of the magnetic steel slot (110) in the circumferential direction of the iron core (100).

7. A motor, It is characterized in that A rotor structure according to any one of claims 1 to 6 is installed.

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