Rotor assembly, motor, magnetic suspension blower and temperature detection method

Abstract

The invention provides a rotor assembly, a motor, a magnetic suspension blower and a temperature detection method, the rotor assembly comprises a rotating shaft, the rotating shaft is provided with a through hole along the axial direction of the rotating shaft, the through hole is internally provided with a guide cylinder, and an annular gap is formed between the outer wall surface of the guide cylinder and the inner wall surface of the through hole; a through hole is formed in the guide cylinder, a temperature detection device is arranged in the through hole, a plurality of detection holes are formed in the peripheral wall of the guide cylinder in the axial direction of the rotating shaft, the temperature detection device comprises a detection part, and the temperature detection device moves in the axial direction of the rotating shaft so that the detection part can be opposite to the detection holes; the technical problem that the temperature of the rotating shaft cannot be comprehensively detected in the prior art can be solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and in particular relates to a rotor assembly, a motor, a magnetic suspension blower and a temperature detection method. Background Art

[0002] High-speed permanent magnet motors have the advantages of small size, high power density and high efficiency. However, due to their small size, high-speed permanent magnet motors are difficult to dissipate heat. At the same time, high-frequency electromagnetic waves produce serious eddy current losses on the rotor core and the surface of the magnetic steel, causing the rotor to run at a higher temperature. Conventional magnetic steel is prone to demagnetization at high temperatures, and the magnetism returns to a magnetic neutral state. Therefore, it is necessary to collect and monitor the temperature of the motor rotor to control the rotor temperature within a reasonable range. Existing high-speed permanent magnet motor rotor temperature detection devices generally use optical fiber sensors, infrared sensors, thermocouples, and irreversible temperature measuring papers to read the rotor temperature. These detection devices are usually fixedly installed in the stator slots, teeth, rotor shaft core, and magnetic steel. The detection value is usually the same as the number of installed detection devices, and it is impossible to perform comprehensive temperature detection on all parts of the rotor.

[0003] How to conduct a more comprehensive inspection of each part of the rotor is a technical problem that urgently needs to be solved. Summary of the invention

[0004] Therefore, the present invention provides a rotor assembly, a motor, a magnetic suspension blower and a temperature detection method, which can solve the technical problem in the prior art that it is impossible to perform comprehensive temperature detection on the rotating shaft.

[0005] A first aspect of the present invention provides a rotor assembly, comprising a rotating shaft, wherein the rotating shaft is provided with a through hole along the axial direction of the rotating shaft, a guide cylinder is provided through the through hole, and an annular gap is formed between the outer wall surface of the guide cylinder and the inner wall surface of the through hole; a temperature detection device is provided in the through hole, and along the axial direction of the rotating shaft, the peripheral wall of the guide cylinder is provided with a long strip-shaped detection hole extending along the axial direction of the rotating shaft, and the temperature detection device includes a detection part, and the temperature detection device can be moved along the axial direction of the rotating shaft so that the detection part is opposite to the detection hole.

[0006] In some embodiments, a bearing is sleeved on the guide cylinder, and the outer circumferential surface of the bearing abuts against the inner wall surface of the through hole.

[0007] In some embodiments, a guide structure extending along the axial direction of the rotating shaft is disposed in the guide cylinder, and the temperature detection device can move along the guide structure.

[0008] In some embodiments, the guide structure includes a first limit surface and a second limit surface parallel to each other, and the space between the first limit surface and the second limit surface is a guide groove; the temperature detection device includes a limit block, and the limit block is arranged in the guide groove.

[0009] In some embodiments, the limiting block includes a first abutting surface slidably fitted with the first limiting surface and a second abutting surface slidably fitted with the second limiting surface.

[0010] In some embodiments, the guide structure includes a first support surface and a second support surface, the first support surface intersects with the first limiting surface, and the second support surface intersects with the second limiting surface; the first support surface extends away from the second limiting surface, and the second support surface extends away from the first limiting surface;

[0011] The temperature detection device includes an extrusion portion, and the extrusion portion includes a first pressing surface and a second pressing surface. The first pressing surface is slidably fitted with the first supporting surface, and the second pressing surface is slidably fitted with the second supporting surface.

[0012] In some embodiments, a driving member is disposed in the extrusion portion, and a roller is disposed on the side of the extrusion portion facing away from the guide groove. The roller abuts against the inner wall surface of the guide cylinder, and the driving member can drive the roller to rotate.

[0013] In some embodiments, the detection portion is disposed on the limiting block, and the detection hole is disposed on a side wall of the guide cylinder between the first limiting surface and the second limiting surface.

[0014] In some embodiments, the guide tube is made of non-magnetic conductive material.

[0015] In a second aspect, the present invention further provides an electric motor, comprising the rotor assembly.

[0016] In a third aspect, the present invention provides a magnetic levitation blower, comprising the above-mentioned motor.

[0017] In a fourth aspect, the present invention provides a temperature detection method for performing temperature detection on the above-mentioned rotor assembly; the temperature detection method comprises: when the shaft rotates, controlling the temperature detection device to turn on and reciprocate along the axial direction of the shaft at a preset speed.

[0018] Since the detection holes are distributed along the axial direction of the rotating shaft, the temperature detection device can move along the axial direction of the rotating shaft to face different detection holes, thereby performing temperature detection on multiple parts of the axial direction of the rotating shaft. Since the rotating shaft rotates, the guide cylinder does not rotate, and the temperature detection device does not rotate either, the detection part of the temperature detection device can perform temperature detection on the circumferential direction of the rotating shaft through the detection holes, thereby being able to fully detect the hot spots at multiple parts of the rotating shaft and the highest temperature of the rotating shaft. When the local temperature of the rotating shaft is too high, the rotating shaft can be controlled to stop rotating to prevent the magnetic steel on the rotor assembly from demagnetizing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0020] Figure 1 is a schematic diagram of a rotating shaft provided with a through hole according to an embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of a rotor assembly according to an embodiment of the present invention;

[0022] Figure 3 The embodiment of the present invention Figure 2 Enlarged view of point A in the middle;

[0023] Figure 4 The embodiment of the present invention Figure 3 A schematic diagram of a temperature detection device provided with a roller;

[0024] Figure 5 The embodiment of the present invention Figure 2 Right view of;

[0025] Figure 6 is a schematic diagram of a guide cylinder, a bearing, and a temperature detection device in an embodiment of the present invention when they are arranged together;

[0026] Figure 7 is an axial cross-sectional view of a guide cylinder provided with a temperature detection device according to an embodiment of the present invention;

[0027] The accompanying drawings are marked as follows:

[0028] 1. Rotating shaft; 101. Through hole; 2. Guide cylinder; 201. Detection hole; 202. Annular spacer; 3. Temperature detection device; 301. Detection part; 302. Limit block; 303. Extrusion part; 304. Roller; 3021. First abutting surface; 3022. Second abutting surface; 3031. First pressing surface; 3032. Second pressing surface; 401. Bearing; 402. Fan blade; 501. First limiting surface; 502. Second limiting surface; 503. Guide groove; 601. First supporting surface; 602. Second supporting surface; 7. Pull rope. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0031] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0032] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0033] The present invention provides a rotor assembly, a motor, a magnetic suspension blower and a temperature detection method, which can solve the technical problem in the prior art that the temperature of a rotating shaft cannot be fully detected.

[0034] See also Figure 1-7 As shown, a rotor assembly provided by the present invention includes a rotating shaft 1, characterized in that the rotating shaft 1 is provided with a through hole 101 along the axial direction of the rotating shaft 1, a guide cylinder 2 is provided through the through hole 101, and an annular gap 202 is formed between the outer wall surface of the guide cylinder 2 and the inner wall surface of the through hole 101; a temperature detection device 3 is provided in the through hole 101, and along the axial direction of the rotating shaft 1, the peripheral wall of the guide cylinder 2 is provided with a long strip-shaped detection hole 201 extending along the axial direction of the rotating shaft 1, and the temperature detection device 3 includes a detection part 301, and the temperature detection device 3 can be moved along the axial direction of the rotating shaft 1 so that the detection part 301 is opposite to the detection hole 201.

[0035] A through hole 101 is arranged along the axial direction of the rotating shaft 1, and a guide cylinder 2 is arranged in the through hole 101. Since an annular interval 202 is formed between the guide cylinder 2 and the through hole 101, the guide cylinder 2 will not be driven to rotate when the rotating shaft 1 rotates. The temperature detection device 3 is arranged in the guide cylinder 2, and the temperature detection device 3 is not affected by the rotation of the rotating shaft 1; the detection part 301 of the temperature detection device 3 is opposite to the detection hole 201, and thus the temperature of the rotating shaft 1 is measured. Since the long strip detection hole 201 extends along the axial direction of the rotating shaft 1, the temperature detection device 3 can move along the axial direction of the rotating shaft 1 and can be opposite to different areas of the detection hole 201, and then the temperature of multiple parts in the axial direction of the rotating shaft 1 can be detected. Since the rotating shaft 1 rotates, the guide cylinder 2 does not rotate, and the temperature detection device 3 does not rotate either, the detection part 301 of the temperature detection device 3 can detect the temperature of the circumferential direction of the rotating shaft 1 through the detection hole 201, and then the hot spots of multiple parts of the rotating shaft 1 and the highest temperature of the rotating shaft 1 can be completely detected. When the local temperature of the rotating shaft 1 is too high, the rotating shaft 1 can be controlled to stop rotating to prevent the magnetic steel on the rotor assembly from being demagnetized.

[0036] Further, such as Figure 6 As shown, a plurality of detection holes 201 are provided, and the plurality of detection holes 201 are arranged at intervals, so that the physical structure between two adjacent detection holes 201 can ensure the structural strength of the guide tube 2, so that the temperature detection device 3 can stably move in the guide tube 2.

[0037] Since the temperature detection device 3 is movably arranged in the wire barrel, the maintenance and replacement of the temperature detection device 3 are convenient.

[0038] The shape of the detection hole 201 is preferably a round hole, such as Figure 7 As shown, the detection part 301, that is, the temperature detection probe can measure the temperature of the rotating shaft 1 through the waist hole.

[0039] Preferably, Figure 3 and Figure 6 As shown, a bearing 401 is sleeved on the guide cylinder 2 , and the outer circumferential surface of the bearing 401 abuts against the inner wall surface of the through hole 101 .

[0040] The guide cylinder 2 is sleeved with a bearing 401, which supports the guide cylinder 2 and prevents the guide cylinder 2 from being suspended in the air, thereby making the guide cylinder 2 more solid as a whole and enabling the temperature detection device 3 to move more stably. Due to the characteristics of the bearing 401 itself, when the shaft 1 rotates, only the outer ring of the bearing 401 can be driven to rotate, while the inner ring of the bearing 401 is fixedly connected to the guide cylinder 2 and does not rotate.

[0041] Further, such as Figure 4 As shown, a fan blade 402 is provided on the inner wall surface of the through hole 101. When the shaft 1 rotates, the fan blade 402 rotates with the shaft 1 and drives the air to flow in the annular gap 202. Specifically, the air enters from one end of the through hole 101 and flows out from the other end, thereby accelerating the heat dissipation of the shaft 1 and preventing the shaft 1 from overheating. Since the bearing 401 plays a supporting role, the inner and outer rings of the bearing 401 rotate relatively, and a ball is provided between the inner and outer rings. The rollers roll and rub to generate heat, which will affect the stability and accuracy of the temperature detection device 3. The airflow generated by the rotation of the fan blade 402 can accelerate the airflow through the bearing 401, thereby preventing the bearing 401 from overheating and affecting the detection effect. Specifically, the fan blade 402 can be set on the inner wall of the ring, and then the ring is inserted into the through hole 101 by interference fit, and is close to the outer ring of the bearing 401. Furthermore, a ring is set on each axial side of each bearing 401. In this way, on the one hand, the heat of the bearing 401 can be dissipated as soon as possible, and on the other hand, the two rings can limit the bearing 401 in the axial direction of the bearing 401 to prevent the bearing 401 from moving axially, thereby preventing the guide cylinder 2 from moving along the axial direction, thereby preventing the actual moving distance and detection position of the temperature detection device 3 from being different from the planned distance and position. The fan blade 402 rotates with the shaft 1 and can also make the air flow pass through the detection hole 201 into the guide cylinder 2, accelerate the gas flow in the guide cylinder 2, and avoid the temperature detection device from rising during long-term operation.

[0042] Further, such as Figure 6As shown, a plurality of bearings 401 are provided, and one bearing 401 is provided between two adjacent detection holes 201, thereby ensuring that the guide cylinder 2 can not be deformed, so that the temperature detection device 3 can be stabilized at one end.

[0043] Preferably, a guide structure extending along the axial direction of the rotating shaft 1 is provided in the guide cylinder 2, and the temperature detection device 3 can move along the guide structure.

[0044] By providing the guide structure, the temperature detection device 3 moves along the guide structure, which further improves the stability of the movement of the temperature detection device 3 and is beneficial to improving the accuracy of stable detection.

[0045] Preferably, Figure 7 As shown, the guide structure includes a first limit surface 501 and a second limit surface 502 parallel to each other, and the space between the first limit surface 501 and the second limit surface 502 is a guide groove 503; the temperature detection device 3 includes a limit block 302, and the limit block 302 is arranged in the guide groove 503.

[0046] The limiting block 302 is limited by the first limiting surface 501 and the second limiting surface 502 , thereby preventing the temperature detection device 3 from moving along the circumferential direction of the through hole 101 , and improving the stability of the movement of the temperature detection device 3 .

[0047] Preferably, Figure 7 As shown, the limiting block 302 includes a first abutting surface 3021 slidably fitted with the first limiting surface 501 and a second abutting surface 3022 slidably fitted with the second limiting surface 502 .

[0048] There is surface contact between the limit block 302 and the limit surface, so that it can not only prevent the temperature detection device 3 from moving along the circumferential direction of the through hole 101, but also prevent the temperature detection device 3 itself from rotating along a certain radial line of the rotating shaft 1, thereby preventing the actual temperature detection point from being different from the planned detection point due to the rotation of the detection part 301 (for example, the displacement of the temperature detection device 3 along the axial direction is 5mm, and the temperature detection device 3 rotates around a certain radial line of the rotating shaft 1, resulting in the detection part 301 moving a distance that is not 5mm, which results in a position difference, and the actual detection position is different from the planned detection position), which is beneficial to improving the accuracy of temperature detection of the rotating shaft 1.

[0049] Preferably, Figure 7As shown, the guide structure includes a first supporting surface 601 and a second supporting surface 602, the first supporting surface 601 intersects with the first limiting surface 501, and the second supporting surface 602 intersects with the second limiting surface 502; the first supporting surface 601 extends away from the second limiting surface 502, and the second supporting surface 602 extends away from the first limiting surface 501;

[0050] The temperature detection device includes an extrusion portion 303 , and the extrusion portion 303 includes a first pressing surface 3031 and a second pressing surface 3032 . The first pressing surface 3031 is slidably fitted with the first supporting surface 601 , and the second pressing surface 3032 is slidably fitted with the second supporting surface 602 .

[0051] Due to the change in the distance between the detection part 301 and the inner wall surface of the through hole 101, the detected temperature will also change to a certain extent. The first supporting surface 601 intersects with the first limiting surface 501, the second supporting surface 602 intersects with the second limiting surface 502, the first clamping surface 3031 slides and fits with the first supporting surface 601, and the second clamping surface 3032 slides and fits with the second supporting surface 602. This keeps the distance between the detection part 301 and the inner wall surface of the through hole 101 stable, thereby ensuring the accuracy of the temperature detected by the temperature detection device 3.

[0052] Preferably, Figure 4 and Figure 7 As shown, a driving member is disposed in the extrusion portion 303 , and a roller 304 is disposed on the side of the extrusion portion 303 facing away from the guide groove 503 . The roller 304 abuts against the inner wall surface of the guide cylinder 2 , and the driving member can drive the roller 304 to rotate.

[0053] The rolling of the roller 304 can drive the temperature detection device 3 to move along the axial direction of the rotating shaft 1. In this way, the movement of the temperature detection device 3 can be controlled more conveniently. Specifically, the driving member is a micro servo motor, which is energized through a wire to drive the roller 304 to rotate, so that the movement of the temperature detection device 3 can be controlled more accurately. A battery can also be provided on the temperature detection device 3 to supply power to the micro servo motor through the battery. The micro servo motor is controlled to rotate forward or reverse by remote control, thereby controlling the direction of rotation of the roller 304 and finally controlling the moving direction of the temperature detection device 3. In this way, the staff can stay away from the rotor assembly, thereby improving the safety of the staff.

[0054] Another embodiment, such as Figure 2 and Figure 3 As shown, two pull ropes 7 are provided on the temperature detection device 3 , and the two pull ropes 7 extend from two ends of the through hole 101 respectively. The pull ropes 7 are pulled manually or in other ways to drive the temperature detection device 3 to move.

[0055] Preferably, Figure 5 and Figure 7 As shown, the detection portion 301 is arranged on the limiting block 302 , and the detection hole 201 is arranged on the side wall of the guide cylinder 2 between the first limiting surface 501 and the second limiting surface 502 .

[0056] The detection part 301 is arranged on the limit block 302, and the limit block 302 is located between the first limit surface 501 and the second limit surface 502, and the detection hole 201 is arranged on the side wall of the guide cylinder 2 between the first limit surface 501 and the second limit surface 502, which makes the distance between the detection part 301 and the inner wall surface of the through hole 101 closer, and can more accurately detect the temperature of the rotating shaft 1; because the limit block 302 is limited by the first limit surface 501 and the second limit surface 502, the limit block 302 is more stable, and is less affected by the vibration of the rotating shaft 1 and the influence of the airflow, which further improves the accuracy of the temperature detection of the rotating shaft 1.

[0057] Preferably, the guide cylinder 2 is made of non-magnetic material.

[0058] The rotors of high-speed motors are all strong magnetic. If the rotor temperature needs to be detected, the temperature detection device 3 will be exposed to this strong magnetic environment, which is very likely to affect the reliability and accuracy of the detection device, and seriously cause the detection device to fail. By setting the guide cylinder 2 to be made of non-magnetic material, the magnetic field of the rotating shaft 1 during rotation is avoided from having an adverse effect on the temperature detection device, the stability and accuracy of the temperature detection device 3 are improved, and the service life of the temperature detection device 3 is also improved; timely and accurate acquisition of the temperature of different areas of the rotating shaft 1 can avoid the rotating shaft 1 from being overheated and fatigued, thereby increasing the service life of the rotating shaft 1.

[0059] Furthermore, the guide cylinder 2 is made of alloy material.

[0060] The present invention provides a motor, comprising the above-mentioned rotor assembly.

[0061] This motor is a high-speed and high-power motor.

[0062] The present invention also provides a magnetic suspension blower, comprising the motor.

[0063] The present invention provides a temperature detection method for performing temperature detection on the above-mentioned rotor assembly; the temperature detection method comprises: when the shaft 1 rotates, controlling the temperature detection device 3 to open and reciprocate along the axial direction of the shaft 1 at a preset speed.

[0064] Furthermore, the moving speed of the temperature detection device 3 is related to the rotation speed of the shaft 1. The faster the rotation speed of the shaft 1, the more heat is generated. To further improve the timeliness of temperature detection, the faster the rotation speed of the shaft 1, the faster the moving speed of the temperature detection device 3. When the detection part 301 is opposite to the detection hole 201, the temperature detection device 3 stops moving and stays for a certain period of time to perform temperature detection on the circumference of the shaft 1. It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A rotor assembly, comprising a rotating shaft (1), characterized in that: The rotating shaft (1) is provided with a through hole (101) along the axial direction of the rotating shaft (1), and a guide cylinder (2) is provided through the through hole (101), and an annular space (202) is formed between the outer wall surface of the guide cylinder (2) and the inner wall surface of the through hole (101); a temperature detection device (3) is provided in the through hole (101), and along the axial direction of the rotating shaft (1), a long strip-shaped detection hole (201) extending along the axial direction of the rotating shaft (1) is provided on the peripheral wall of the guide cylinder (2), and the temperature detection device (3) comprises a detection part (301), and the temperature detection device (3) can be moved along the axial direction of the rotating shaft (1) so that the detection part (301) and the detection hole (201) are opposite.

2. The rotor assembly according to claim 1, characterized in that: A bearing (401) is sleeved on the guide cylinder (2), and the outer circumferential surface of the bearing (401) abuts against the inner wall surface of the through hole (101).

3. The rotor assembly according to claim 1, characterized in that: A guide structure extending along the axial direction of the rotating shaft (1) is arranged in the guide cylinder (2), and the temperature detection device (3) can move along the guide structure.

4. The rotor assembly according to claim 3, characterized in that: The guide structure comprises a first limit surface (501) and a second limit surface (502) which are parallel to each other, and the space between the first limit surface (501) and the second limit surface (502) is a guide groove (503); the temperature detection device (3) comprises a limit block (302), and the limit block (302) is arranged in the guide groove (503).

5. The rotor assembly according to claim 4, characterized in that: The limiting block (302) comprises a first abutting surface (3021) that is slidably fitted with the first limiting surface (501) and a second abutting surface (3022) that is slidably fitted with the second limiting surface (502).

6. The rotor assembly according to claim 4, characterized in that: The guide structure comprises a first supporting surface (601) and a second supporting surface (602); the first supporting surface (601) intersects with the first limiting surface (501), and the second supporting surface (602) intersects with the second limiting surface (502); the first supporting surface (601) extends away from the second limiting surface (502), and the second supporting surface (602) extends away from the first limiting surface (501); The temperature detection device (3) comprises an extrusion portion (303), wherein the extrusion portion (303) comprises a first pressing surface (3031) and a second pressing surface (3032), wherein the first pressing surface (3031) is slidably fitted to the first supporting surface (601), and the second pressing surface (3032) is slidably fitted to the second supporting surface (602).

7. The rotor assembly according to claim 6, characterized in that A driving member is arranged in the extrusion portion (303); a roller (304) is arranged on the side of the extrusion portion (303) facing away from the guide groove (503); the roller (304) abuts against the inner wall surface of the guide cylinder (2); and the driving member can drive the roller (304) to rotate.

8. The rotor assembly according to claim 7, characterized in that The detection portion (301) is arranged on the limit block (302), and the detection hole (201) is arranged on the side wall of the guide cylinder (2) between the first limit surface (501) and the second limit surface (502).

9. The rotor assembly according to any one of claims 1 to 8, characterized in that: The guide cylinder (2) is made of non-magnetic conductive material.

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

11. A magnetic levitation blower, characterized in that: The motor comprising the motor described in claim 10.

12. A temperature detection method, characterized in that: Used to perform temperature detection on the rotor assembly according to any one of claims 1 to 9; the temperature detection method comprises: when the shaft (1) rotates, controlling the temperature detection device (3) to open and reciprocate along the axial direction of the shaft (1) at a preset speed.

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