Rotor assembly, magnetic levitation motor and blower

Abstract

The application provides a rotor assembly, a magnetic suspension motor and a blower, which comprises two supports which are arranged at intervals, a rotating shaft which is arranged between the two supports, the two ends of the rotating shaft are respectively directed towards the two supports and arranged at intervals with the two supports, the rotating shaft is provided with a through hole which penetrates through the axial two ends of the rotating shaft, a supporting shaft which is arranged in the through hole, and the two ends of the supporting shaft are connected to the supports; when the magnetic suspension motor works, the inner wall surface of the through hole and the outer wall surface of the supporting shaft are not in contact, thereby the technical problem that the inherent frequency of the rotating shaft of the magnetic suspension motor in the prior art is low and the rotating speed cannot be further increased can be solved.

Description

Technical Field

[0001] This invention belongs to the field of magnetic levitation motor technology, specifically relating to a rotor assembly, a magnetic levitation motor, and a blower. Background Technology

[0002] High-speed permanent magnet motors are widely used in various industrial fields due to their advantages such as simple structure, high energy density, no excitation loss, and high efficiency. As industrial applications place increasing demands on motor performance, the design of high-speed permanent magnet motors often exhibits characteristics of high operating speed, high power density, and high electromagnetic load, which undoubtedly greatly increases the difficulty of permanent magnet motor design. As the rated speed of the rotor increases, the influence of the rotor's natural frequency on rotor operation becomes more pronounced, leading to more significant rotor vibration and making it difficult to control the precision of the motor bearings. Therefore, improving the rotor's natural frequency remains a significant challenge.

[0003] High-speed permanent magnet motors have advantages such as small size, high power density and high efficiency. However, because the rotor of a magnetic levitation high-speed motor (IPM) is equipped with axial bearings, radial bearings, protective bearings, position sensors, etc., the rotor is too long and the rotor fixed frequency is too low, making it impossible to further increase the rotor speed.

[0004] Existing methods for increasing the natural frequency of high-speed permanent magnet motor rotors include: 1. Optimizing rotor raw materials to increase the strength of the rotor material itself, but this method often increases the rotor cost dramatically; 2. Optimizing the spacing of rotor assembly parts to make the rotor more compact, thereby increasing the rotor's natural frequency, but this increases the difficulty of motor assembly and the installation difficulty of protective bearings; 3. Adjusting the material of rotor assembly parts and optimizing the rotor's center of gravity to increase the rotor's natural frequency, but the improvement effect is minimal.

[0005] How to effectively increase the natural frequency of the rotor is a technical problem that urgently needs to be solved. Summary of the Invention

[0006] Therefore, the present invention provides a rotor assembly, a magnetic levitation motor and a blower, which can solve the technical problem that the natural frequency of the shaft of the magnetic levitation motor in the prior art is low and cannot achieve higher speed rotation.

[0007] This invention provides a rotor assembly for use in a magnetic levitation motor, comprising:

[0008] Two supports are provided, spaced apart from each other.

[0009] A rotating shaft is disposed between two supports, with its two ends facing the two supports respectively and spaced apart from them. The rotating shaft is provided with through holes penetrating both ends of its own axial direction.

[0010] A support shaft is arranged in the through hole, and two ends of the support shaft are connected to the support frame;

[0011] When the magnetic levitation motor is in operation, the inner wall surface of the through hole and the outer wall surface of the support shaft are not in contact.

[0012] In some embodiments, a first bearing is arranged on the support shaft, and when the magnetic levitation motor is in operation, the outer circular surface of the first bearing and the inner wall surface of the through hole are not in contact.

[0013] In some embodiments, a first weight-reducing space is arranged at the first end of the through hole, and a second weight-reducing space is arranged at the second end of the through hole.

[0014] In some embodiments, at least two second bearings are arranged on the support shaft, one of the second bearings is arranged in the first weight-reducing space, and the other of the second bearings is arranged in the second weight-reducing space; when the magnetic levitation motor is in operation, the outer circular surface of the second bearing and the inner wall surface of the weight-reducing space are not in contact, when the magnetic levitation motor is not in operation, the outer circular surface of the second bearing and the inner wall surface of the weight-reducing space are in contact, and the inner wall surface of the through hole and the support shaft are not in contact.

[0015] In some embodiments, a first radial magnetic levitation rotor and a second radial magnetic levitation rotor are arranged on the rotating shaft, and in the radial direction of the rotating shaft, the first radial magnetic levitation rotor at least partially overlaps with the first weight-reducing space, and the second radial magnetic levitation rotor at least partially overlaps with the second weight-reducing space.

[0016] In some embodiments, in the axial direction of the rotating shaft, the through hole at least includes a first through hole and a second through hole, and the cross-sectional areas of the first through hole and the second through hole are different.

[0017] In some embodiments, the two ends of the support shaft are fixedly connected to the support frame.

[0018] In some embodiments, the two ends of the support shaft are rotatably connected to the support frame about the axis of the support shaft.

[0019] The application further provides a magnetic levitation motor comprising the rotor assembly according to any one of claims 1-8.

[0020] The application provides a blower comprising the magnetic levitation motor.

[0021] In some embodiments, the air outlet of the blower is provided with a flow guide pipe, and the outlet of the flow guide pipe is connected to the through hole.

[0022] The application sets a through hole on the rotating shaft, and sets a supporting shaft in the through hole. When the magnetic suspension motor works, the rotating shaft is not in contact with the supporting shaft. When the magnetic suspension motor does not work, the rotating shaft falls on the supporting shaft. Compared with the prior art which needs to set a protection bearing on both ends of the rotating shaft, the application sets a through hole, which reduces the weight of the rotating shaft and improves the natural frequency of the rotating shaft, shortens the axial length of the rotating shaft, optimizes the mass distribution, and also improves the natural frequency of the rotating shaft. After the natural frequency of the rotating shaft is improved, a greater rotating speed can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. The drawings in the following description are only exemplary, and those skilled in the art can also obtain other implementation drawings according to the provided drawings without paying creative labor.

[0024] Figure 1 is a schematic view of the rotating shaft provided with a through hole in the embodiment of the present application;

[0025] Figure 2 is a schematic view of the embodiment of the present application provided with a conical surface;

[0026] Figure 3 is a schematic view of the supporting shaft provided with a first bearing in the embodiment of the present application;

[0027] Figure 4 is a schematic view of the rotating shaft provided with a supporting shaft in the through hole in the embodiment of the present application;

[0028] Figure 5 is a schematic view of the embodiment of the present application provided with a second bearing;

[0029] The drawings are as follows:

[0030] 1, rotating shaft; 101, through hole; 2, supporting shaft; 301, first bearing; 302, second bearing; 401, first weight reduction space; 402, second weight reduction space; 501, first radial magnetic suspension rotor; 502, second radial magnetic suspension rotor; 6, axial bearing; 7, conical surface. DETAILED DESCRIPTION

[0031] Clearly, the described embodiments are only a part of all embodiments of the present application, rather than all embodiments. The following description of at least one example embodiment is merely illustrative in nature and is in no way limiting to the application and its applications or uses. Based upon the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0032] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are generally based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, without the opposite description, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation to the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0033] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawings is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the example term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0034] In addition, it should be noted that the use of "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore it cannot be understood as a limitation to the scope of protection of the present application.

[0035] The present application provides a rotor assembly, a magnetic suspension motor and a blower, which can solve the technical problem that the inherent frequency of the rotating shaft of the magnetic suspension motor in the prior art is low and cannot realize higher speed rotation.

[0036] For reference Figures 1-5As shown, the rotor assembly provided by the application is applied to a magnetic suspension motor, and comprises:

[0037] Two supports, the two supports are arranged at intervals;

[0038] A rotating shaft 1 is arranged between the two supports, two ends of the rotating shaft 1 are respectively directed towards the two supports and arranged at intervals with the two supports, and the rotating shaft 1 is provided with a through hole 101 penetrating through axial two ends of the rotating shaft 1.

[0039] A supporting shaft 2 is arranged in the through hole 101, and two ends of the supporting shaft 2 are connected to the supports.

[0040] When the magnetic suspension motor works, the inner wall surface of the through hole 101 and the outer wall surface of the supporting shaft 2 are not in contact.

[0041] Through the above arrangement, when the magnetic suspension motor works, the rotating shaft 1 is floated up to a certain distance under the action of the magnetic suspension bearing and then rotates, at this time, the supporting shaft 2 is not in contact with the rotating shaft 1, and the supporting shaft 2 does not affect the rotation of the rotating shaft 1; when the magnetic suspension motor does not work, the magnetic suspension bearing no longer floats the rotating shaft 1, and the rotating shaft 1 falls down on the supporting shaft 2. Since the through hole 101 is arranged on the rotating shaft 1, the weight of the rotating shaft 1 is reduced, and thus the natural frequency of the rotating shaft 1 is improved. In the prior art, the protective bearing is arranged at two ends of the rotating shaft 1, the rotating shaft 1 is arranged in the protective bearing, the rotating shaft 1 does not contact the protective bearing when the rotating shaft 1 works, and the rotating shaft 1 falls down on the protective bearing when the rotating shaft 1 does not work, which makes the axial length of the rotating shaft 1 longer; in the present application, the rotating shaft 1 falls down on the supporting shaft 2 arranged in the through hole 101 when the rotating shaft 1 does not work, which makes the axial length of the rotating shaft 1 smaller than the axial length of the rotating shaft 1 in the prior art, and thus the weight of the rotating shaft 1 is further reduced, and the natural frequency of the rotating shaft 1 is further improved. After the natural frequency of the rotating shaft 1 is improved, the maximum rotating speed of the rotating shaft 1 can be further improved.

[0042] The two supports can use the structure for arranging the protective bearing in the prior art, and the rotating shaft 1 is arranged between the two supports after being shortened. The supporting shaft 2 is connected to the support for bearing the rotating shaft 1 which does not work.

[0043] Further, the through hole 101 is a circular hole and coaxial with the rotating shaft 1.

[0044] Preferably, as Figure 3 and Figure 4 a first bearing 301 is sleeved on the supporting shaft 2, and when the magnetic suspension motor works, the outer circular surface of the first bearing 301 and the inner wall surface of the through hole 101 are not in contact.

[0045] By sleeving the first bearing 301 on the support shaft 2, the rotating shaft 1 falls on the first bearing 301 when it is not working, and due to inertia, the rotating shaft 1 still has a certain rotating speed when it is not working. When the rotating rotating shaft 1 falls on the first bearing 301, the rotating shaft 1 can drive the outer ring of the first bearing 301 to continue to rotate, avoiding sliding friction. Not only can it reduce friction noise and friction vibration, but also can reduce the heat generated by friction.

[0046] Further, the first bearing 301 is provided with a plurality of, for example, four, and the four first bearings 301 are uniformly arranged; the cross section of the support shaft 2 is circular.

[0047] Further, the inner ring of the first bearing 301 and the outer circle of the support shaft 2 are provided with an annular damping layer. When the rotating shaft 1 falls on the first bearing 301, the annular damping layer plays a damping role, reduces noise, and also reduces the impact on the inner wall surface of the through hole 101 of the rotating shaft 1. Avoiding the impact of the rotating shaft 1 falling to cause the inner wall surface of the through hole 101 to have a concave-convex structure, avoiding the change of the center of gravity of the rotating shaft 1, ensuring the integrity of the inner wall surface of the through hole 101, and further ensuring the rotating balance of the rotating shaft 1.

[0048] Preferably, as shown in Figure 1 and Figure 5 , the first end of the through hole 101 is provided with a first weight reduction space 401, and the second end of the through hole 101 is provided with a second weight reduction space 402.

[0049] By setting the first weight reduction space 401 and the second weight reduction space 402, on the one hand, the weight of the rotating shaft 1 is further reduced, and the natural frequency of the rotating shaft 1 is improved. On the other hand, the center of gravity of the rotating shaft 1 is optimized, and the natural frequency of the rotating shaft 1 is further improved.

[0050] Preferably, as shown in Figure 5 , at least two second bearings 302 are sleeved on the support shaft 2, one of the second bearings 302 is arranged in the first weight reduction space 401, and the other of the second bearings 302 is arranged in the second weight reduction space 402; when the magnetic suspension motor is working, the outer circular surface of the second bearing 302 is not in contact with the inner wall surface of the weight reduction space; when the magnetic suspension motor is not working, the outer circular surface of the second bearing 302 is in contact with the inner wall surface of the weight reduction space, and the inner wall surface of the through hole 101 is not in contact with the support shaft 2.

[0051] By setting two second bearings 302 on the support shaft 2, and the two second bearings 302 are set in the weight-reducing space, since the weight-reducing space is larger, which makes the diameter of the second bearing 302 larger, which makes the load capacity of the second bearing 302 improved, since the through hole 101 and the support shaft 2 are always not in contact, which is beneficial to the air flow between the support shaft 2 and the through hole 101, and further beneficial to the cooling of the rotating shaft 1.

[0052] Further, the first weight-reducing space 401 and the second weight-reducing space 402 are both cylindrical spaces.

[0053] Further, as shown in Figure 2 the first weight-reducing space 401 is a conical surface 7 towards the side wall surface of the through hole 101, the small end of the conical surface 7 is towards the through hole 101, the conical surface 7 can not only reduce the weight of the rotating shaft 1, but also reduce the concentrated stress and improve the strength of the rotating shaft, and the conical surface 7 can also guide the airflow, which is beneficial to the air entering the through hole 101 from the first weight-reducing space 401, and is beneficial to the cooling of the rotating shaft 1.

[0054] Preferably, as shown in Figure 1 the rotating shaft 1 is sleeved with a first radial magnetic suspension rotor 501 and a second radial magnetic suspension rotor 502, and in the radial direction of the rotating shaft 1, the first radial magnetic suspension rotor 501 at least partially coincides with the first weight-reducing space 401, and the second radial magnetic suspension rotor at least partially coincides with the second weight-reducing space 402.

[0055] The first radial magnetic suspension bearing and the second radial magnetic suspension bearing are used to suspend the rotating shaft 1. The first radial magnetic suspension bearing includes a first radial magnetic suspension rotor 501 fixed on the rotating shaft 1 and a first radial magnetic suspension stator fixed on the bearing seat. Since the first radial magnetic suspension rotor 501 is sleeved on the rotating shaft 1 and at least partially coincides with the first weight-reducing space 401, the first radial magnetic suspension rotor 501 has a wrapping strengthening effect on the rotating shaft 1, so that the thickness between the inner wall surface of the first weight-reducing space 401 and the outer wall surface of the rotating shaft 1 can be reduced, the weight of the rotating shaft 1 is further reduced, and the natural frequency of the rotating shaft 1 is improved. The second radial magnetic suspension rotor 502 and the first radial magnetic suspension rotor 501 have the same effect.

[0056] Preferably, in the axial direction of the rotating shaft 1, the through hole 101 at least includes a first through hole and a second through hole, and the cross-sectional areas of the first through hole and the second through hole are different.

[0057] When the through hole 101 is a circular hole, the diameters of the first through hole and the second through hole are different. By making the diameters of the through hole 101 different, the mass distribution of the rotating shaft 1 can be optimized, the natural frequency of the rotating shaft 1 is improved, and finally the maximum rotating speed of the rotating shaft 1 is improved.

[0058] Preferably, the two ends of the support shaft 2 are fixedly connected to the support.

[0059] The support shaft 2 is fixed to the support, thereby improving the stability of the support shaft 2, and when the rotating shaft 1 falls on the support shaft 2, excessive vibration can be avoided, and when the rotating shaft 1 moves radially for adjustment, the movement of the rotating shaft 1 is more stable due to the fixed connection.

[0060] Preferably, the two ends of the support shaft 2 are rotatably connected to the support around the axis of the support shaft 2.

[0061] The two ends of the support shaft 2 are rotatably connected to the support around the axis of the support shaft 2, so that when the rotating shaft 1 falls on the support shaft 2, the support shaft 2 can also rotate around its own axis, thereby reducing the force generated by the rotation of the rotating shaft 1 on the support shaft 2. When the first bearing 301 is provided, the outer circle of the first bearing 301 follows the rotation of the rotating shaft 1, and considering the impact force generated when the rotating shaft 1 falls on the support shaft 2 and the possible jamming, the support shaft 2 can also rotate around its own axis, which transmits part of the rotation energy of the rotating shaft 1 to the support shaft 2 that can rotate around its own axis, thereby facilitating the rapid deceleration of the rotating shaft 1. Specifically, bearings are arranged at the two ends of the support shaft 2 for connection.

[0062] The application further provides a magnetic suspension motor comprising the rotor assembly.

[0063] The rotor assembly of the magnetic suspension motor further comprises an axial bearing 6 arranged on the rotating shaft 1, which limits the axial direction of the rotating shaft 1.

[0064] The two supports can be part of the housing of the magnetic suspension motor, or can be separately arranged in the housing.

[0065] The application provides an air blower comprising the magnetic suspension motor.

[0066] Preferably, the air outlet of the air blower is provided with a flow guide pipe, and the outlet of the flow guide pipe is connected to the through hole 101.

[0067] Part of the air blown by the air blower enters the through hole 101 through the flow guide pipe, thereby cooling the rotating shaft 1.

[0068] Those skilled in the art can easily understand that the advantageous technical features of the above-mentioned modes can be freely combined and superimposed without conflict.

[0069] The above merely describes preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above merely describes preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A rotor assembly for a magnetic levitation motor, characterized by, The application relates to a magnetic suspension motor rotor assembly. Two supports are arranged at intervals. A rotating shaft (1) is arranged between the two supports, the two ends of the rotating shaft (1) are respectively arranged towards the two supports and are arranged at intervals with the two supports, and the rotating shaft (1) is provided with a through hole (101) penetrating through the axial two ends of the rotating shaft (1). A supporting shaft (2) is arranged in the through hole (101), and the two ends of the supporting shaft (2) are connected to the supports. When the magnetic suspension motor works, the inner wall surface of the through hole (101) and the outer wall surface of the supporting shaft (2) are not in contact. A first bearing (301) is arranged on the supporting shaft (2), and when the magnetic suspension motor works, the outer circular surface of the first bearing (301) and the inner wall surface of the through hole (101) are not in contact. A first radial magnetic suspension rotor (501) and a second radial magnetic suspension rotor (502) are arranged on the rotating shaft (1).

2. The rotor assembly of claim 1, wherein A first weight-reducing space (401) is arranged at the first end of the through hole (101), and a second weight-reducing space (402) is arranged at the second end of the through hole (101).

3. The rotor assembly of claim 2, wherein At least two second bearings (302) are arranged on the supporting shaft (2), one of the second bearings (302) is arranged in the first weight-reducing space (401), and the other of the second bearings (302) is arranged in the second weight-reducing space (402); when the magnetic suspension motor works, the outer circular surface of the second bearing (302) and the inner wall surface of the weight-reducing space are not in contact, when the magnetic suspension motor does not work, the outer circular surface of the second bearing (302) and the inner wall surface of the weight-reducing space are in contact, and the inner wall surface of the through hole (101) and the supporting shaft (2) are not in contact.

4. The rotor assembly of claim 3, wherein In the radial direction of the rotating shaft (1), the first radial magnetic suspension rotor (501) and the first weight-reducing space (401) at least partially coincide, and the second radial magnetic suspension rotor and the second weight-reducing space (402) at least partially coincide.

5. The rotor assembly of claim 1, wherein In the axial direction of the rotating shaft (1), the through hole (101) at least comprises a first through hole and a second through hole, and the cross-sectional areas of the first through hole and the second through hole are different.

6. The rotor assembly of any one of claims 1-5, wherein, The two ends of the supporting shaft (2) are fixedly connected to the supports.

7. The rotor assembly of any one of claims 1-5, wherein, The two ends of the supporting shaft (2) are rotatably connected to the supports.

8. A magnetic levitation motor, characterized by, The application further discloses a magnetic suspension motor comprising the rotor assembly.

9. A blower, characterized by The application further discloses a magnetic suspension motor comprising the rotor assembly.

10. The air blower of claim 9, wherein The outlet of the air blower is provided with a flow guide pipe, and the outlet of the flow guide pipe is connected to the through hole (101).

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