Rotor structure and motor

Abstract

The utility model discloses a rotor structure, comprising a back iron which is in a circular ring structure and is used for bearing a permanent magnet and a magnetic conductive block; the hollow shaft penetrates through the inner ring of the back iron, and circulating cooling liquid is introduced into a central cavity of the hollow shaft; the heat conduction pieces are evenly arranged in the circumferential direction of the back iron, at least parts of the heat conduction pieces are embedded into the back iron, one ends of the heat conduction pieces are embedded into the sides, facing the central axis of the back iron, of the magnetic conduction blocks, and the other ends of the heat conduction pieces stretch into the hollow shaft; and the shell is formed on the two sides of the back iron in the axial direction through injection molding. According to the utility model, the hollow shaft penetrates through the inner circle of the back iron, heat generated at the periphery of the magnetic conductive block is conducted to the position of the hollow shaft through the heat conducting piece, and the circulating cooling liquid is introduced into the central cavity of the hollow shaft to exchange heat with the heat conducting piece, so that the heat at the periphery of the magnetic conductive block is quickly discharged. The utility model also discloses a motor comprising the rotor structure.

Description

Technical Field

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

[0002] The rotor is the rotating part in the motor. For the electric motor, the rotor is the moving part in the process of converting electrical energy into mechanical energy. In the permanent magnet motor, the rotor structure is alternately provided with permanent magnets and magnetic blocks on the back iron. At present, in order to improve the stability of the rotor structure, the components on the rotor are often wrapped and limited by an injection-molded shell and fixedly connected as an integrated structure, so that the various components of the rotor maintain a stable shape during the rotation process. However, in the above structure, the interior of the rotor is a relatively closed structure, and the rotor will generate a lot of heat during the rotation process. The injection-molded shell is also difficult to discharge the heat in time. Long-term operation will cause the temperature of the rotor structure to rise. In severe cases, the permanent magnet will be demagnetized, which will affect the life of the motor.

[0003] Therefore, how to improve the heat dissipation effect of the rotor structure and extend the service life of the rotor structure is a problem that technical personnel in this field need to solve urgently. Utility Model Content

[0004] In view of this, an object of the utility model is to provide a rotor structure with good heat dissipation effect and long service life.

[0005] Another object of the present invention is to provide a motor including the above-mentioned rotor structure.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A rotor structure, comprising:

[0008] The back iron is in a ring configuration and is used to carry the permanent magnet and the magnetic conductive block;

[0009] A hollow shaft is arranged through the inner ring of the back iron, and a circulating coolant is passed into the central cavity of the hollow shaft;

[0010] A plurality of heat-conducting members are evenly arranged along the circumferential direction of the back iron, wherein the heat-conducting members are at least partially embedded in the back iron, and one end of the heat-conducting member is embedded in the magnetic conductive block on one side facing the central axis of the back iron, and the other end of the heat-conducting member extends into the hollow shaft;

[0011] The shell is injection molded on both sides of the back iron in the axial direction.

[0012] Preferably, in the above rotor structure, the heat conducting member is a cavity structure and is filled with liquid-gas phase change medium.

[0013] Preferably, in the above rotor structure, the number of the heat-conducting members and the number of the magnetic conductive blocks are the same, and one heat-conducting member is embedded in any one of the magnetic conductive blocks.

[0014] Preferably, in the above-mentioned rotor structure, the hollow shaft is a cylindrical shaft with an opening on one side, the open end of the hollow shaft includes a liquid inlet and a liquid outlet symmetrically arranged around the liquid inlet, and an insertion port corresponding to the heat conductor one by one is opened on the side wall of the hollow shaft.

[0015] Preferably, in the above rotor structure, the circulating coolant is oil, the center of the liquid inlet is located on the central axis of the hollow shaft, and four liquid outlets are provided.

[0016] Preferably, in the above rotor structure, a plurality of connection holes are provided on the back iron, and the connection holes are evenly arranged along the circumferential direction of the back iron, and the shell is injection-molded to fill any of the connection holes.

[0017] Preferably, in the above rotor structure, a placement groove for partially embedding the heat conducting member is provided on one side of the back iron.

[0018] Preferably, in the above rotor structure, the back iron and the magnetic conductive block are made of magnetically conductive silicon steel sheets, steel or SMC.

[0019] A motor comprises a stator and a rotor structure as described in any one of the above embodiments.

[0020] Preferably, in the above motor, it comprises a single rotor structure and two stators, and the two stators are arranged to clamp the rotor structure, or,

[0021] The electric machine includes two rotor structures and a single stator.

[0022] It can be seen from the above technical scheme that the rotor structure provided by the utility model includes a back iron, a hollow shaft, a heat conductive member and a shell, wherein the back iron is a ring configuration, and its main body is used to carry components such as permanent magnets and magnetic conductive blocks, and the inner circle is used to provide heat dissipation space, and the hollow shaft is arranged through the inner ring of the back iron, and a circulating coolant is passed into the central cavity of the hollow shaft. On the basis of the above structure, the heat of the magnetic conductive block is transferred out through the heat conductive member. Specifically, a plurality of heat conductive members are evenly arranged along the circumferential direction of the back iron, and the heat conductive member is at least partially embedded in the back iron to maintain a stable state, and at the same time, one end of the heat conductive member is embedded in the conductive member. The magnetic block faces one side of the central axis of the back iron. The heat generated by the magnetic block during the rotation of the rotor structure will be transferred to the connected heat conductor, and the other end of the heat conductor extends into the hollow shaft to transfer the heat to the hollow shaft through the heat conductor, and the heat is taken out with the movement of the circulating coolant in the hollow shaft, so as to avoid heat accumulation inside the rotor structure and cause temperature rise, which affects the service life of the rotor structure. The outer shell is injection molded on both sides of the back iron in the axial direction to limit the permanent magnet and the magnetic block from both sides, fix the heat conductor, and fill the gap on the back iron to improve the structural integrity of the rotor structure. The rotor structure provided by the utility model has a hollow shaft passing through the inner ring of the back iron, and circulating coolant is passed into the central cavity of the hollow shaft so that the heat inside the rotor structure can be promptly removed by the coolant. At the same time, a plurality of heat-conducting parts are evenly arranged in the circumferential direction of the back iron, and one end of the heat-conducting part is directly embedded in the magnetic block so that the magnetic block that is easy to generate heat can transfer the heat from the position of the heat-conducting part in time. The other end of the heat-conducting part is inserted into the central shaft to exchange heat with the circulating coolant. Each heat-conducting part is responsible for a heat dissipation area of ​​equal area, so that each area inside the rotor structure has a uniform cooling effect, thereby improving the service life of the rotor structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 1 A schematic diagram of a rotor structure provided in an embodiment of the utility model;

[0025] Figure 2 A schematic diagram of a rotor structure without a housing provided in an embodiment of the utility model;

[0026] Figure 3 A schematic diagram of the assembly of the back iron and the magnetic conductive block provided in an embodiment of the utility model;

[0027] Figure 4 A schematic diagram of the hollow shaft structure provided by an embodiment of the utility model;

[0028] Figure 5 A schematic cross-sectional view of the assembly of the hollow shaft and the heat conducting member provided in the embodiment of the utility model;

[0029] Among them, 10 is back iron; 110 is a connecting hole; 120 is a placement slot; 20 is a permanent magnet; 30 is a magnetic conductive block; 40 is a hollow shaft; 410 is a liquid inlet; 420 is a liquid outlet; 430 is an insertion port; 50 is a heat conducting member; and 60 is a housing. DETAILED DESCRIPTION

[0030] The core of the utility model is to disclose a rotor structure with good heat dissipation effect and long service life.

[0031] Another object of the utility model is to disclose a motor including the above rotor structure.

[0032] In order to make the technical personnel in this field better understand the present invention, the embodiments of the present invention are described below with reference to the accompanying drawings. In addition, the embodiments shown below do not limit the contents of the utility model described in the claims. In addition, the entire contents of the structures represented by the following embodiments are not limited to those necessary for the solutions of the utility model described in the claims.

[0033] like Figure 1 , Figure 2 and Figure 3As shown, the rotor structure provided by the embodiment of the utility model includes a back iron 10, a hollow shaft 40, a heat conductive member 50 and a shell, wherein the back iron 10 is a ring configuration, and its main body is used to carry components such as permanent magnets 20 and magnetic blocks 30, and the inner circle is used to provide heat dissipation space, and the hollow shaft 40 is arranged through the inner ring of the back iron 10, and circulating coolant is passed into the central cavity of the hollow shaft 40. On the basis of the above structure, the heat of the magnetic block 30 is transferred out through the heat conductive member 50. Specifically, a plurality of heat conductive members 50 are evenly arranged along the circumferential direction of the back iron 10, and the heat conductive member 50 is at least partially embedded in the back iron 10 to maintain a stable state, and at the same time, one end of the heat conductive member 50 is embedded in the magnetic block 30 is toward one side of the central axis of the back iron 10. The heat generated by the magnetic block 30 during the rotation of the rotor structure will be transferred to the connected heat conductor 50, and the other end of the heat conductor 50 extends into the hollow shaft 40 to transfer the heat to the hollow shaft 40 through the heat conductor 50, and the heat is taken out with the movement of the circulating coolant in the hollow shaft 40, so as to avoid the heat accumulation inside the rotor structure causing the temperature rise, which affects the service life of the rotor structure. The shell 60 is injection molded on both sides of the back iron 10 in the axial direction, so as to limit the permanent magnet 20 and the magnetic block 30 from both sides, fix the heat conductor 50, and fill the gap on the back iron 10 to improve the structural integrity of the rotor structure.

[0034] The rotor structure provided by the embodiment of the utility model has a hollow shaft 40 passing through the inner ring of the back iron 10, and a circulating coolant is introduced into the central cavity of the hollow shaft 40 so that the heat inside the rotor structure can be promptly removed by the coolant. At the same time, a plurality of heat-conducting parts 50 are evenly arranged in the circumferential direction of the back iron 10. One end of the heat-conducting part 50 is directly embedded in the magnetic block 30 so that the magnetic block 30 that is easy to generate heat can transfer the heat from the position of the heat-conducting part 50 in time. The other end of the heat-conducting part 50 is inserted into the central shaft to exchange heat with the circulating coolant. Each heat-conducting part 50 is responsible for a heat dissipation area of ​​equal area, so that each area inside the rotor structure has a uniform cooling effect, thereby improving the service life of the rotor structure.

[0035] Furthermore, in the rotor structure provided in the embodiment of the utility model, the function of the heat conductor 50 is to transfer heat, and it can be made of a metal material with strong thermal conductivity such as aluminum or copper, so as to directly transfer heat to the hollow shaft 40 by heat conduction. In a preferred embodiment of the utility model, the heat conductor 50 is a cavity structure, and is filled with a liquid-gas phase change medium to form a structure similar to a heat pipe. It should be noted here that liquid-gas phase change medium is preferably used in the heat conductor 50 to transfer heat through the state change of the medium. The phase change medium absorbs heat and vaporizes at a position close to the magnetic block 30, and releases heat and liquefies at one end inserted into the hollow shaft 40. During the rotation of the rotor structure, the phase change medium is centrifuged, and the liquid medium moves to the end close to the magnetic block 30, thereby accelerating the absorption of heat and vaporizing. Therefore, in the above structure, the liquid-gas phase change medium can not only conduct heat around the magnetic block 30 through state changes, but also can match the movement process of the rotor structure so that the medium automatically moves along the path of efficient heat transfer.

[0036] Furthermore, in a specific embodiment of the present invention, the number of heat conductive components 50 and magnetic conductive blocks 30 is the same, and one heat conductive component 50 is embedded in any magnetic conductive block 30, that is, a single heat conductive component 50 is responsible for the heat dissipation around a single magnetic conductive block 30, thereby preventing the heat around a single heat conductive component 50 from being too concentrated and unable to be discharged in time.

[0037] Furthermore, in the rotor structure provided in the embodiment of the utility model, if Figure 4 and Figure 5 As shown, the hollow shaft 40 is specifically a cylindrical shaft structure with a single-side opening, and a liquid inlet 410 and a liquid outlet 420 are provided at the open end of the hollow shaft 40 for the introduction and discharge of circulating coolant. It should be noted that a number of liquid outlets 420 are symmetrically arranged about the liquid inlet 410 to avoid blockage when the circulating coolant flows out. At the same time, an insertion port 430 is provided on the side wall of the hollow shaft 40, and the insertion port 430 corresponds one-to-one with the heat conductive member 50. The one-to-one correspondence here specifically refers to that the number of the insertion ports 430 is the same as that of the heat conductive member 50, and each heat conductive member 50 is correspondingly inserted from the insertion port 430 to extend into the interior of the hollow shaft 40 for heat exchange with the circulating coolant.

[0038] It should be noted that, in the above embodiment, the hollow shaft 40 and the heat conductor 50 are designed according to the characteristics of the rotor structure to provide a phase change heat exchange area and a fluidity heat exchange area in a limited area, and rapid heat transfer is achieved through liquid-gas phase change working fluid and circulating coolant, which conforms to the motion conditions of the rotor structure and avoids the influence of excessive temperature rise on the life of the rotor structure.

[0039] In order to further optimize the above technical solution, in a specific embodiment of the utility model, the circulating coolant is oil, so as to quickly absorb and transfer heat by contacting its smaller specific heat capacity. At the same time, the liquid inlet 410 is a circular hole structure, and the center of the liquid inlet 410 is located on the central axis of the hollow shaft 40, so that when the circulating coolant is injected, the circulating coolant is injected from the center of the hollow shaft 40 and evenly dispersed to the side wall area. At the same time, four liquid outlets 420 are evenly arranged along the axial direction of the liquid inlet 410 to discharge the circulating coolant in four equally divided areas respectively to avoid blockage.

[0040] Furthermore, in a specific embodiment of the utility model, a plurality of connecting holes 110 are provided on the back iron 10, and the connecting holes 110 are through holes and are evenly arranged along the circumferential direction of the back iron 10. The outer shells 60 on both sides of the back iron 10 in the axial direction are injection molded, and due to the existence of the connecting holes 110, the outer shells 60 on both sides will fill the connecting holes 110 and be connected into an integrated structure. At the same time, the injection molded outer shells 60 will be tightened from both sides of the back iron 10 to directly compress the magnetic block 30, the permanent magnet 20 and the heat conductor 50, thereby improving the integrity of the rotor structure.

[0041] Furthermore, in order to facilitate the installation of the heat conducting member 50 , in a specific embodiment of the present invention, a placement groove 120 is provided on one side of the back iron 10 for partially embedding the heat conducting member 50 .

[0042] Furthermore, in the rotor structure provided in the embodiment of the present invention, the material of the back iron 10 and the magnetic conductive block 30 is silicon steel sheet, steel or SMC (glass reinforced plastic) with magnetic conductivity.

[0043] An embodiment of the utility model further provides a motor, which includes a stator and a rotor structure provided in any of the above embodiments. It should be noted that the stator structure is a traditional stator structure, which will not be described in detail here.

[0044] Based on the above embodiments, the motor can be a structure including a single rotor structure and two stators, in which the two stators clamp the rotor structure, or a structure including two rotor structures and a single stator. A single-stator and single-rotor structure can also be adopted, and it can be set according to actual working conditions.

[0045] The terms "first", "second", "left side" and "right side" in the specification and claims of the utility model and the above drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may include steps or units that are not listed.

[0046] 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 structure, characterized in that: include: The back iron (10) is in a circular ring configuration, and the back iron (10) is used to carry the permanent magnet (20) and the magnetic conductive block (30); A hollow shaft (40) is arranged to pass through the inner ring of the back iron (10), and a circulating coolant is introduced into the central cavity of the hollow shaft (40); A plurality of heat conducting members (50) are evenly arranged along the circumferential direction of the back iron (10), the heat conducting members (50) are at least partially embedded in the back iron (10), one end of the heat conducting member (50) is embedded in the magnetic conductive block (30) on the side facing the central axis of the back iron (10), and the other end of the heat conducting member (50) extends into the hollow shaft (40); The outer shell (60) is injection-molded on both sides of the back iron (10) in the axial direction.

2. The rotor structure according to claim 1, characterized in that: The heat conducting member (50) is a hollow structure and is filled with liquid-gas phase change medium.

3. The rotor structure according to claim 1, characterized in that: The number of the heat-conducting components (50) and the number of the magnetic conductive blocks (30) are the same, and one heat-conducting component (50) is embedded in any one of the magnetic conductive blocks (30).

4. The rotor structure according to claim 1, characterized in that: The hollow shaft (40) is a cylindrical shaft with an opening on one side, the open end of the hollow shaft (40) comprises a liquid inlet (410) and a liquid outlet (420) symmetrically arranged around the liquid inlet (410), and an insertion opening (430) corresponding one-to-one to the heat conducting member (50) is provided on the side wall of the hollow shaft (40).

5. The rotor structure according to claim 4, characterized in that: The circulating coolant is oil, the center of the liquid inlet (410) is located on the central axis of the hollow shaft (40), and four liquid outlets (420) are provided.

6. The rotor structure according to claim 1, characterized in that: The back iron (10) is provided with a plurality of connection holes (110), the connection holes (110) being evenly arranged along the circumferential direction of the back iron (10), and the housing (60) is injection-molded to fill any of the connection holes (110).

7. The rotor structure according to claim 1, characterized in that: A placement groove (120) for partially embedding the heat conducting member (50) is provided on one side of the back iron (10).

8. The rotor structure according to claim 1, characterized in that: The back iron (10) and the magnetic conductive block (30) are made of magnetically conductive silicon steel sheets, steel or SMC.

9. A motor, characterized in that: The invention comprises a stator and a rotor structure as claimed in any one of claims 1 to 8.

10. The motor according to claim 9, characterized in that It comprises a single rotor structure and two stators, wherein the two stators clamp the rotor structure, or The electric machine includes two rotor structures and a single stator.

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