Rotor with heat dissipation structure and axial motor

Abstract

The utility model discloses a rotor with a heat dissipation structure, which comprises a retainer, a rotating shaft, a sheath and magnetic steel, a heat conduction groove is arranged in the retainer along the radial direction, a groove opening is arranged at the end part of the heat conduction groove close to the rotating shaft, a heat conduction piece is arranged in the heat conduction groove, and the magnetic steel is arranged in the heat conduction piece. One end part of the heat conduction piece extends out of the groove opening of the heat conduction groove and is contacted with the rotating shaft, and the other end of the heat conduction piece is arranged close to the magnetic steel; the rotating shaft is provided with a hollow through cavity in the axial direction, and cooling fluid is introduced into the hollow through cavity. According to the rotor with the heat dissipation structure, rapid heat dissipation of the magnetic steel can be realized, the phenomenon of demagnetization of the magnetic steel due to overhigh temperature is avoided, and the service life of the rotor is prolonged. The utility model also discloses an axial motor.

Description

Technical Field

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

[0002] Axial flux motors, also known as axial motors, offer a compact structure, high power density, and high efficiency. Increasing the motor's speed can improve its power density, leading to a trend toward higher speeds. However, these motors require a high level of rotor strength. Furthermore, high speeds increase the motor's frequency and rotor losses. For a dual-stator, single-rotor motor, the limited internal space within the rotor makes heat dissipation difficult, leading to the risk of magnetic demagnetization due to excessive temperatures.

[0003] Conventional axial motor with double stator and single rotor structure, the rotor structure includes magnet 02, retainer 01, sleeve 03 and shaft 04, such as Figure 1 As shown in the figure, cage 01 is typically made of a non-conductive composite material, which has a low thermal conductivity and is difficult to effectively conduct away the heat generated by magnet 02. While using metal instead of composite material for cage 01 improves structural strength, the metal material leads to higher eddy current losses, further increasing the temperature rise of the rotor. Utility Model Content

[0004] In view of this, the utility model provides a rotor with a heat dissipation structure, which can achieve rapid heat dissipation of the magnetic steel, avoid demagnetization of the magnetic steel due to excessive temperature, and extend the service life of the rotor.

[0005] The utility model also provides an axial motor.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A rotor with a heat dissipation structure includes a retaining frame, a rotating shaft, a sleeve and a magnetic steel. A heat conduction groove is provided radially in the retaining frame, and a groove opening is provided at the end of the heat conduction groove near the rotating shaft. A heat conduction member is provided in the heat conduction groove, and one end of the heat conduction member extends out of the groove opening of the heat conduction groove and contacts the rotating shaft, and the other end is provided near the magnetic steel; a hollow through cavity is provided axially on the rotating shaft, and a cooling fluid is passed through the hollow through cavity.

[0008] Optionally, the retaining frame includes a main frame body and support arms, a plurality of support arms are provided, and the plurality of support arms are evenly distributed around the main frame body, a mounting through hole is provided at the center of the main frame body, and the slot opening of the heat conduction slot is provided on the side wall of the mounting through hole;

[0009] One end of the heat conducting groove away from the rotating shaft is a sealed structure or an open structure.

[0010] Optionally, each of the heat conduction grooves extends radially from the main frame body into the support arm, and at least one heat conduction groove is provided in each support arm. The groove width of the heat conduction groove is smaller than the width of the thinnest position of the support arm.

[0011] Optionally, the end of the heat conduction groove located in the support arm is arranged close to the distal end of the support arm;

[0012] Alternatively, the end of the heat conduction groove located in the support arm penetrates through the distal end of the support arm.

[0013] Optionally, a limiting disc for axially limiting the cage is arranged on the rotating shaft. The limiting disc is fixedly arranged on the rotating shaft, and the limiting disc is in contact with the end face of the cage;

[0014] The heat conducting member is a heat pipe or a ceramic sheet.

[0015] Optionally, a limiting sliding groove for limiting the end of the heat conducting member is arranged on the rotating shaft. The limiting sliding groove is arranged on one side of the first end of the limiting disc close to the rotating shaft. The first end of the rotating shaft is the sliding-in installation end of the cage. The length direction of the limiting sliding groove is parallel to the axis of the rotating shaft. One side of the limiting sliding groove close to the first end of the rotating shaft is an open structure, and the end of the heat conducting member is slidably connected in the limiting sliding groove.

[0016] Optionally, the bottom surface of the limiting sliding groove is flush with the outer surface of the first end of the rotating shaft. The number of the limiting sliding grooves is the same as the number of the heat conducting members, and the heat conducting members are arranged corresponding to the limiting sliding grooves.

[0017] Optionally, the length dimension of the limiting sliding groove is greater than the thickness dimension of the cage along the axial direction;

[0018] Different limiting sliding grooves are separated by limiting bosses. The distance from the top surface of the limiting boss to the axis of the rotating shaft is smaller than the distance from the top surface of the limiting disc to the axis of the rotating shaft.

[0019] Optionally, two heat conduction grooves are arranged in each support arm, and the two heat conduction grooves are arranged in parallel along the axial direction of the rotating shaft.

[0020] As can be seen from the above technical solutions, for the rotor with a heat dissipation structure provided by the present invention, by arranging heat conduction grooves in the cage and heat conducting members in the heat conduction grooves, since one end of the heat conducting member is arranged close to the magnetic steel and the other end is connected to the rotating shaft, the heat conducting member quickly conducts the heat generated by the magnetic steel to the rotating shaft, and the heat is taken away by the fluid in the hollow cavity, thereby realizing the rapid heat dissipation of the magnetic steel, avoiding the phenomenon of demagnetization of the magnetic steel due to too high temperature, and prolonging the service life of the rotor.

[0021] The present utility model also provides an axial motor, including a rotor and a stator. The rotor is the rotor with a heat dissipation structure as described above, so it has the advantages of the above rotor, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a schematic structural diagram of the rotor of the axial motor in the prior art;

[0024] Figure 2 It is a schematic structural diagram of the rotor with a heat dissipation structure provided by an embodiment of the present utility model;

[0025] Figure 3 It is a schematic cross-sectional structural diagram of the rotor with a heat dissipation structure provided by an embodiment of the present utility model along the axis position;

[0026] Figure 4 It is a schematic structural diagram of the heat conduction groove reserved on the cage provided by the embodiment of the present utility model;

[0027] Figure 5 It is a schematic structural diagram of the cage with a heat conduction member installed therein provided by the embodiment of the present utility model;

[0028] Figure 6 It is a schematic structural diagram of the rotating shaft provided by the embodiment of the present utility model;

[0029] Figure 7 It is a schematic cross-sectional structural diagram of the rotating shaft along the axis position provided by the embodiment of the present utility model;

[0030] Figure 8 It is a schematic cross-sectional structural diagram of the rotor with a heat dissipation structure provided by another embodiment of the present utility model along the axis position;

[0031] Figure 9 For Figure 8 the exploded structural diagram of the cage and the heat conduction member of the rotor with a heat dissipation structure in

[0032] Wherein:

[0033] 01, cage; 02, magnetic steel; 03, sheath; 04, rotating shaft,

[0034] 1, cage,

[0035] 101. Mounting through-hole, 102. Heat-conducting groove, 103. Main frame body, 104. Support arm

[0036] 2. Sheath

[0037] 3. Magnet

[0038] 4. Rotating shaft

[0039] 401. Hollow cavity, 402. Limit sliding groove, 403. First end, 404. Limit disk, 405. Limit boss

[0040] 5. Heat-conducting member Specific implementation manner

[0041] The utility model discloses a rotor with a heat dissipation structure, which can realize the rapid heat dissipation of the magnet, avoid the phenomenon of demagnetization of the magnet due to too high temperature, and prolong the service life of the rotor

[0042] The utility model also discloses an axial motor

[0043] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present utility model

[0044] Referring to Figures 2 to 7 , the rotor with a heat dissipation structure of the present utility model includes a cage 1, a rotating shaft 4, a sheath 2 and a magnet 3. A heat-conducting groove 102 is arranged radially in the cage 1. A groove opening is arranged at the end of the heat-conducting groove 102 close to the rotating shaft 4. A heat-conducting member 5 is arranged in the heat-conducting groove 102. The end of the heat-conducting member 5 extends out of the groove opening of the heat-conducting groove 102 and is connected with the rotating shaft 4 in a limited way. The rotating shaft 4 is provided with a hollow cavity 401 along the axial direction, and a cooling fluid is introduced into the hollow cavity 401

[0045] Among them, the hollow cavity 401 is communicated with an external cooling system, and the cooling system is used to circulate and input a cooling fluid into the hollow cavity 401. The heat-conducting member 5 is a strip-shaped block of a high heat-conducting material. One end of the heat-conducting member 5 far from the rotating shaft 4 is arranged close to the magnet 3, so that the heat-conducting member 5 conducts the heat of the magnet 3 to the rotating shaft 4, and the heat of the rotating shaft 4 is taken away by the fluid in the hollow cavity 401. The heat-conducting member 5 is a structural member with good heat-conducting performance, and specifically can be a heat pipe or a ceramic sheet

[0046] The rotor with a heat dissipation structure of the present utility model has heat conduction grooves 102 provided in the cage 1, and heat conduction members 5 are arranged in the heat conduction grooves 102. Since one end of the heat conduction member 5 is close to the magnetic steel 3 and the other end is connected to the rotating shaft 4, the heat generated by the magnetic steel 3 is quickly conducted to the rotating shaft 4 by the heat conduction member 5, and the heat is taken away by the fluid in the hollow through cavity 401, thereby realizing the rapid heat dissipation of the magnetic steel 3, avoiding the demagnetization phenomenon of the magnetic steel 3 due to excessive temperature, and prolonging the service life of the rotor.

[0047] Specifically, the cage 1 includes a main frame body 103 and support arms 104. As Figure 4 shown, a plurality of support arms 104 are provided, and the multiple support arms 104 are evenly distributed around the main frame body 103. The magnetic steel 3 is installed in the gap between two adjacent support arms 104. For the convenience of installation on the rotating shaft 4, an installation through hole 101 is provided at the central position of the main frame body 103, and the groove opening of the heat conduction groove 102 is provided on the hole side wall of the installation through hole 101, so as to facilitate the end of the heat conduction member 5 to extend out of the cage 1 and contact the rotating shaft 4, as Figure 3 and Figure 5 shown. In order to improve the structural strength of the cage 1, the heat conduction groove 102 is a blind hole groove with one end open and the other end sealed. The end of the heat conduction groove 102 far from the rotating shaft 4 is a sealed structure, thereby avoiding a greater impact on the strength of the cage 1 caused by the heat conduction groove 102 with both ends open, and ensuring the structural strength of the cage 1. It can be understood that in other embodiments, if the cage 1 can meet the structural strength, the heat conduction groove 102 can also be set as a groove body structure with both ends open, and the opening at the end far from the rotating shaft 4 can be limited by the sheath 2.

[0048] In order to conduct the heat of the magnetic steel 3 to the heat conduction member 5 as soon as possible, each heat conduction groove 102 extends radially from the main frame body 103 into the support arm 104, and at least one heat conduction groove 102 is provided in each support arm 104, that is, at least one heat conduction member 5 is provided. The groove width of the heat conduction groove 102 is smaller than the width of the thinnest position of the support arm 104, so that the heat conduction member 5 is wrapped in the support arm 104. In one embodiment, one heat conduction member 5 is provided in each support arm 104, and the heat conduction members 5 in different support arms 104 are located in the same plane perpendicular to the axis of the rotating shaft 4, as Figure 3 shown. In another embodiment, two heat conduction members 5 are provided in each support arm 104, as Figure 8 and Figure 9 shown. The heat conduction members 5 in different support arms 104 are located in two planes perpendicular to the axis of the rotating shaft 4, as Figure 9 shown, that is, two layers of heat conduction members 5 are provided in the cage 1, which increases the heat conduction area of the axial plane of the heat conduction member 5 and improves the cooling capacity.

[0049] To facilitate the conduction of more heat from the magnet steel 3 to the rotating shaft 4, the end of the heat conduction groove 102 located within the support arm 104 is disposed near the distal end of the support arm 104. The distal end of the support arm 104 is the end of the support arm 104 that is away from the rotating shaft 4. On the premise of ensuring the structural strength of the cage 1, the axial thickness of the heat conduction member 5 should be as close as possible to the thickness of the magnet steel 3, and the circumferential width should be as close as possible to the width of the support arm 104, so as to facilitate the transfer of more heat.

[0050] To axially limit the cage 1, a limit disk 404 is provided on the rotating shaft 4. The limit disk 404 is fixedly arranged on the rotating shaft 4, and the limit disk 404 is in contact with the end face of the cage 1, thus facilitating the limitation of the cage 1. It can be understood that the outer diameter of the limit disk 404 is larger than the aperture of the mounting through hole 101.

[0051] To limit the end of the heat conduction member 5 extending out of the heat conduction groove 102, a limit sliding groove 402 for limiting the end of the heat conduction member 5 is provided on the rotating shaft 4. The limit sliding groove 402 is arranged on one side of the first end 403 of the limit disk 404 close to the rotating shaft 4. The first end 403 of the rotating shaft 4 is the sliding-in mounting end of the cage 1, and the outer surface diameter of the first end 403 is not larger than the distance between two oppositely arranged heat conduction members 5 for easy installation. The length direction of the limit sliding groove 402 is arranged parallel to the axis of the rotating shaft 4. The side of the limit sliding groove 402 close to the first end 403 of the rotating shaft 4 is an open structure, facilitating the sliding assembly of the cage 1 with the heat conduction member 5 from the first end 403. The end of the heat conduction member 5 is slidably connected within the limit sliding groove 402.

[0052] Furthermore, the bottom surface of the limit sliding groove 402 is flush with the outer surface of the first end 403 of the rotating shaft 4. The number of the limit sliding grooves 402 is the same as the number of the heat conduction members 5, and the heat conduction members 5 and the limit sliding grooves 402 are correspondingly arranged. This corresponding arrangement includes that the circumferential width of the heat conduction member 5 is the same as the circumferential width of the limit sliding groove 402, so that when the heat conduction member 5 is slidably connected within the limit sliding groove 402, the circumferential limitation of the cage 1 is realized. The end of the cage 1 away from the limit disk 404 is limited by the support portion of the rotating shaft 4, which will not be elaborated here.

[0053] To ensure reliable circumferential limitation, the length dimension of the limit sliding groove 402 is larger than the axial thickness dimension of the cage 1. As Figure 6 and Figure 7 shown, different limit sliding grooves 402 are separated by limit bosses 405. The distance from the top surface of the limit boss 405 to the axis of the rotating shaft 4 is less than the distance from the top surface of the limit disk 404 to the axis of the rotating shaft 4, that is, the outer diameter dimension of the limit boss 405 is less than the outer diameter dimension of the top surface of the limit disk 404.

[0054] In one embodiment, the limiting disk 404 and the rotating shaft 4 are of an integral structure. The limiting sliding groove 402 is a machined groove body. The outer diameter of the first end 403 of the rotating shaft 4 is smaller than the outer diameter of the other end of the rotating shaft 4. The cooling fluid introduced into the hollow through cavity 401 is air or cooling water, so that heat is transferred by the flowing cooling fluid. The cage 1 is a composite cage. The heat conducting member 5 can be in the structure of a rectangular strip or other shapes, which is not limited herein. When manufacturing the rotor with a heat dissipation structure of the present utility model, the cage 1 is integrally formed by laminating composite materials, and a structural shape of a heat conducting groove 102 for placing the heat conducting member 5 can be left inside the composite materials. The heat conducting member 5 is placed into the heat conducting groove 102, and then the remaining part is filled with composite materials. Finally, the cage 1 installed with the heat conducting member 5 is formed by hot curing pressing, so as to ensure that the heat conducting member 5 is fixedly installed in the cage 1.

[0055] For the rotor with a heat dissipation structure of the present utility model, by arranging the heat conducting groove 102 inside the cage 1 and inserting the heat conducting member 5 into the heat conducting groove 102, the outer diameter of the heat conducting member 5 is preferably smaller than the outer diameter of the cage 1 to improve the structural strength of the cage 1. The outer diameter of the heat conducting member 5 can also be consistent with the outer diameter of the support arm 104 of the cage 1, and the structure of the heat conducting member 5 is fixed by the sheath 2. The end of the heat conducting member 5 close to the rotating shaft 4 abuts against the rotating shaft 4. The limiting sliding groove 402 is arranged on the rotating shaft 4, which can not only increase the heat dissipation area at the shaft end, enable heat to be directly conducted from the magnet 3 to the rotating shaft 4 to improve the heat dissipation effect, but also perform circumferential limiting on the cage 1.

[0056] The present utility model also provides an axial motor, including a rotor and a stator, and the rotor is the rotor with a heat dissipation structure as described above.

[0057] In the description of this solution, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present 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 should not be construed as a limitation to this solution.

[0058] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this solution, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0059] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.

[0060] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rotor with a heat dissipation structure, comprising a cage, a rotating shaft, a sheath and a permanent magnet, characterized in that, The cage is provided with heat-conducting grooves radially, and a groove opening is arranged at an end of the heat-conducting groove close to the rotating shaft. A heat-conducting member is arranged in the heat-conducting groove. One end of the heat-conducting member extends out of the groove opening of the heat-conducting groove and is in contact with the rotating shaft, and the other end is close to the magnetic steel; a hollow through cavity is arranged axially on the rotating shaft, and a cooling fluid is introduced into the hollow through cavity.

2. The rotor with a heat dissipation structure according to claim 1, characterized in that, The cage includes a main frame body and support arms. There are several support arms, and the plurality of support arms are evenly distributed around the main frame body. An installation through hole is arranged at the central position of the main frame body, and the groove opening of the heat-conducting groove is arranged on the hole side wall of the installation through hole; One end of the heat-conducting groove far from the rotating shaft is a sealed structure or an open structure.

3. The rotor with a heat dissipation structure according to claim 2, characterized in that, Each heat-conducting groove extends radially from the main frame body into the support arm, and at least one heat-conducting groove is arranged in each support arm. The groove width of the heat-conducting groove is smaller than the width of the thinnest position of the support arm.

4. The rotor with a heat dissipation structure according to claim 3, characterized in that, The end of the heat-conducting groove in the support arm is close to the distal end of the support arm; Alternatively, the end of the heat-conducting groove in the support arm penetrates through the distal end of the support arm.

5. The rotor with a heat dissipation structure according to claim 1, characterized in that, A limiting disc for axially limiting the cage is arranged on the rotating shaft. The limiting disc is fixedly arranged on the rotating shaft, and the limiting disc is in contact with the end face of the cage; The heat-conducting member is a heat pipe or a ceramic sheet.

6. The rotor with a heat dissipation structure according to claim 5, characterized in that, A limiting sliding groove for limiting the end of the heat-conducting member is arranged on the rotating shaft. The limiting sliding groove is arranged on one side of the first end of the limiting disc close to the rotating shaft. The first end of the rotating shaft is the sliding-in installation end of the cage. The length direction of the limiting sliding groove is parallel to the axis of the rotating shaft. One side of the limiting sliding groove close to the first end of the rotating shaft is an open structure, and the end of the heat-conducting member is slidably connected in the limiting sliding groove.

7. The rotor with a heat dissipation structure according to claim 6, characterized in that, The bottom surface of the limiting sliding groove is flush with the outer surface of the first end of the rotating shaft. The number of the limiting sliding grooves is the same as the number of the heat-conducting members, and the heat-conducting members are arranged corresponding to the limiting sliding grooves.

8. The rotor with a heat dissipation structure according to claim 6, characterized in that, The length dimension of the limiting sliding groove is greater than the axial thickness dimension of the cage; Different limiting sliding grooves are separated by limiting bosses, and the distance from the top surface of the limiting boss to the axis of the rotating shaft is smaller than the distance from the top surface of the limiting disc to the axis of the rotating shaft.

9. The rotor with a heat dissipation structure according to claim 3, characterized in that, Two heat-conducting grooves are arranged in each support arm, and the two heat-conducting grooves are arranged in parallel along the axis of the rotating shaft.

10. An axial motor, comprising a rotor and a stator, characterized in that, The rotor is the rotor with a heat dissipation structure according to any one of claims 1-9.

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