Rotor assembly and medical micromotor

Abstract

The utility model discloses a rotor assembly and a medical micromotor, and relates to the micromotor technology field, the rotor assembly comprises a first shaft piece, a second shaft piece and a rotor main body, the first shaft piece is provided with a first installation hole arranged along the axial direction; the second shaft part and the first shaft part are coaxially arranged, the second shaft part is provided with a second mounting hole formed in the axial direction of the second shaft part, and a hole opening of the first mounting hole and a hole opening of the second mounting hole are oppositely formed; the connecting sleeve is arranged between the first shaft piece and the second shaft piece in a sleeving mode, and the two ends of the connecting sleeve coincide with the end of the first shaft piece and the end of the second shaft piece correspondingly; and the rotor main body is arranged in the first mounting hole, the connecting sleeve and the second mounting hole in a penetrating manner, and the rotor main body is wrapped by the first shaft piece, the connecting sleeve and the second shaft piece together. According to the technical scheme provided by the utility model, the problem that the existing rotor body is easy to corrode due to being exposed in the external environment is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of micromotors, in particular to a rotor assembly and a medical micromotors. Background Art

[0002] Micromotors are often used in handheld surgical power devices due to their small size, high speed, light weight, no cogging torque, etc. Existing micromotors usually include a stator assembly with multiple coils and a rotor assembly disposed in the stator, and the rotor assembly mostly includes a cylindrical rotor body and a rotating shaft, and the rotor body is mostly made of permanent magnets (such as magnetic steel, etc.).

[0003] After the existing rotor is assembled, the permanent magnets will be exposed to the external environment, and it is impossible to ensure that the magnetic steel is completely covered; since most permanent magnets are made of metal materials, the exposed permanent magnets may rust due to contamination, affecting the working performance of the motor and shortening its service life. Utility Model Content

[0004] The main purpose of the utility model is to provide a rotor assembly and a medical micromotor, aiming to solve the problem that the existing rotor body is easily corroded due to being exposed to the external environment.

[0005] In order to achieve the above-mentioned object, the utility model provides a rotor assembly, wherein the rotor assembly comprises:

[0006] A first shaft member having a first mounting hole arranged along its axial direction;

[0007] A second shaft member is coaxially arranged with the first shaft member, the second shaft member has a second mounting hole arranged along its axial direction, and the opening of the first mounting hole and the opening of the second mounting hole are arranged opposite to each other;

[0008] A connecting sleeve, wherein the connecting sleeve is disposed between the first shaft member and the second shaft member, and two ends of the connecting sleeve are respectively disposed to overlap with an end portion of the first shaft member and an end portion of the second shaft member; and

[0009] The rotor body is inserted into the first mounting hole, the connecting sleeve and the second mounting hole, and the rotor body is covered by the first shaft, the connecting sleeve and the second shaft.

[0010] In one embodiment, the rotor body is inserted into the first mounting hole and the second mounting hole with an interference fit; the connecting sleeve is sleeved on the outer circumference of the rotor body with an interference fit; and the rotor body is a permanent magnet.

[0011] In one embodiment, the connecting sleeve includes a sleeve body and a connecting portion, the connecting portion is provided at at least one end of the sleeve body, and the outer diameter of the connecting portion is smaller than the outer diameter of the sleeve body, and at least one of the first shaft member and the second shaft member is interference fit with the outer circumferential surface of the connecting portion.

[0012] In one embodiment, the sleeve body has a limiting surface, and the limiting surface is an end surface of the sleeve body facing the first shaft member or the second shaft member;

[0013] Wherein, the end surface of the first shaft member facing the sleeve body abuts against the limit surface; and / or the end surface of the second shaft member facing the sleeve body abuts against the limit surface.

[0014] In one embodiment, a gap between at least one of the first shaft member and the second shaft member and the connecting sleeve is filled with adhesive.

[0015] In one embodiment, the first shaft member includes a first shaft head portion and a first barrel portion, the first shaft head portion is arranged on a side of the first barrel portion away from the second shaft member, the first barrel portion is provided with the first mounting hole, and the first shaft head portion is provided with a first inner hole connected to the first mounting hole.

[0016] In one embodiment, the second shaft member includes a second shaft head portion and a second barrel portion, the second shaft head portion is arranged on a side of the second barrel portion away from the first shaft member, the second barrel portion is provided with the second mounting hole, and the second shaft head portion is provided with a second inner hole connected to the second mounting hole.

[0017] In one embodiment, a center hole is provided inside the rotor body, and the center hole is arranged to penetrate the rotor body in the axial direction, one end of the center hole is connected to the first inner hole, and the other end of the center hole is connected to the second inner hole.

[0018] In one embodiment, the outer diameter of the first shaft head portion is smaller than the outer diameter of the first cylindrical portion, and a balancing weight is provided on the outer periphery of one end of the first shaft head portion close to the first cylindrical portion.

[0019] In one embodiment, the outer diameter of the second shaft head portion is smaller than the outer diameter of the second cylindrical portion, and a balancing weight is provided on the outer periphery of one end of the second shaft head portion close to the second cylindrical portion.

[0020] In one embodiment, the first shaft head portion is provided with a first limiting shoulder, and the first limiting shoulder is provided at an end of the first shaft head portion away from the second shaft member.

[0021] In one embodiment, the second shaft head portion is provided with a second limiting shoulder, and the second limiting shoulder is provided at an end of the second shaft head portion away from the first shaft member.

[0022] The utility model also provides a medical micromotor, which comprises a stator assembly and a rotor assembly described in any one of the above embodiments, wherein the rotor assembly is arranged in the stator assembly.

[0023] In the technical scheme of the utility model, by dividing the rotating shaft in the rotor assembly into a first shaft member and a second shaft member coaxially arranged with the first shaft member, the two shaft members are processed separately, the precision requirement of the processing technology is low, and it is beneficial to improve the processing efficiency; a first mounting hole arranged along its axial direction is provided in the first shaft member, and a second mounting hole arranged along its axial direction is provided in the second shaft member, and the opening of the first mounting hole and the opening of the second mounting hole are arranged relatively, and the rotor body is inserted into the first mounting hole and the second mounting hole. In addition, a connecting sleeve is also provided between the first shaft member and the second shaft member, and the first shaft member and the second shaft member are fixedly connected with the connecting sleeve as the same positioning member, which is beneficial to improve the coaxiality of the first shaft member and the second shaft member and reduce the unbalance of the rotor. In addition, the connecting sleeve is arranged on the outer periphery of the rotor body, so that the rotor body is covered by the first shaft member, the second shaft member and the connecting sleeve together, and the covered rotor body will not be contaminated by dirt and rust due to being exposed to the outside; the technical scheme reduces the possibility of the rotor body being broken, deformed or weakened in magnetic force due to rust, which is beneficial to improve its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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 the structures shown in these drawings without paying creative work.

[0025] Figure 1 A schematic structural diagram of an embodiment of a rotor assembly provided by the utility model;

[0026] Figure 2 A structural cross-sectional view of an embodiment of a rotor assembly provided by the utility model;

[0027] Figure 3 A cross-sectional view of the matching structure of the first shaft member, the second shaft member and the connecting sleeve in another embodiment of the rotor assembly provided by the utility model;

[0028] Figure 4 for Figure 3 A partial enlarged view of the middle A;

[0029] Figure 5 A schematic structural diagram of a connecting sleeve in yet another embodiment of a rotor assembly provided by the utility model;

[0030] Figure 6 The present invention is a structural cross-sectional view of another embodiment of a rotor assembly provided by the present invention.

[0031] Description of Figure Numbers:

[0032] 100. Rotor assembly; 1. First shaft member; 11. First barrel portion; 111. First mounting hole; 12. First shaft head portion; 121. First inner hole; 122. First limiting shoulder; 2. Second shaft member; 21. Second barrel portion; 211. Second mounting hole; 22. Second shaft head portion; 221. Second inner hole; 222. Second limiting shoulder; 3. Rotor body; 31. Center hole; 4. Connecting sleeve; 41. Sleeve body; 411. Limiting surface; 42. Connecting portion; 5. Balance block.

[0033] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0037] After the existing rotor is assembled, the permanent magnets will be exposed to the external environment, and it is impossible to ensure that the magnetic steel is completely covered; since most permanent magnets are made of metal materials, the exposed permanent magnets may rust due to contamination, affecting the working performance of the motor and shortening its service life.

[0038] The utility model provides a rotor assembly.

[0039] See also Figures 1 to 3 In one embodiment of the present invention, the rotor assembly 100 comprises:

[0040] The first shaft member 1 has a first mounting hole 111 arranged along its axial direction;

[0041] The second shaft member 2 is coaxially arranged with the first shaft member 1, and the second shaft member 2 has a second mounting hole 211 arranged along its axial direction, and the opening of the first mounting hole 111 and the opening of the second mounting hole 211 are arranged opposite to each other;

[0042] The rotor body 3 is inserted into the first mounting hole 111 and the second mounting hole 211; and

[0043] The connecting sleeve 4 is arranged between the first shaft member 1 and the second shaft member 2 and is sleeved on the outer periphery of the rotor body 3. The two ends of the connecting sleeve 4 are respectively arranged to overlap with the end of the first shaft member 1 and the end of the second shaft member 2, and the rotor body 3 is jointly covered by the first shaft member 1, the connecting sleeve 4 and the second shaft member 2.

[0044] In the technical solution of the utility model, the rotating shaft in the rotor assembly 100 is divided into a first shaft member 1 and a second shaft member 2 coaxially arranged with the first shaft member 1, and the two shaft members are processed separately, which has low requirements on the precision of the processing technology and is conducive to improving the processing efficiency; a first mounting hole 111 arranged along its axial direction is provided in the first shaft member 1, and a second mounting hole 211 arranged along its axial direction is provided in the second shaft member 2, and the opening of the first mounting hole 111 and the opening of the second mounting hole 211 are arranged oppositely, and the rotor body 3 is inserted into the first mounting hole 111 and the second mounting hole 211. In addition, a connecting sleeve 4 is also provided between the first shaft member 1 and the second shaft member 2, and the first shaft member 1 and the second shaft member 2 are fixedly connected with the connecting sleeve 4 as the same positioning member, which is conducive to improving the coaxiality of the first shaft member 1 and the second shaft member 2 and reducing the unbalance of the rotor. In addition, the connecting sleeve 4 is sleeved on the outer periphery of the rotor body 3, so that the rotor body 3 is jointly covered by the first shaft member 1, the second shaft member 2 and the connecting sleeve 4, and the covered rotor body 3 will not be contaminated by dirt and rust due to being exposed to the outside; this technical solution reduces the possibility of rupture, deformation or weakening of the magnetic force of the rotor body due to rust, which is beneficial to improving its service life.

[0045] Specifically, the first shaft member 1 and the second shaft member 2 in this embodiment can be made of metal or other materials, and the shapes of the first mounting hole 111 and the second mounting hole 211 are not specifically limited, as long as they are shapes that match the outer shape of the rotor body. It should be noted that there is no specific limitation on the embedding length of the rotor body in the two mounting holes, as long as the rotor body can be covered by the two shaft members and the connecting sleeve 4. In the rotor assembly 100 in this embodiment, since the outer wall of the rotor body 3 can be processed with very high precision, the mounting hole is set on the rotating shaft, the rotor body 3 is installed in the mounting holes of the two shaft members and the inside of the connecting sleeve 4, and the two ends of the connecting sleeve 4 are respectively overlapped with the end of the first shaft member 1 and the end of the second shaft member 2, so that the connecting sleeve 4 and the first shaft member 1 and the second shaft member 2 can achieve interference fit, which can not only improve the connection strength, but also ensure that the rotor body 3 and the first shaft member 1 and the second shaft member 2 have extremely high coaxial precision and axial dimensional precision.

[0046] In the embodiments of the present invention, please refer to Figure 3 and Figure 4, the rotor body 3 is inserted into the first mounting hole 111 and the second mounting hole 211 with interference fit. Through the interference fit between the outer wall of the rotor body 3 and the inner wall of the mounting hole, the unbalance of the rotor body 3 is very small, and the micro motor will run more smoothly, especially in high-speed motors. The advantage is more obvious; and the matching strength of the rotor body 3 and the two shafts of the rotor assembly 100 mainly depends on the interference fit, rather than mainly relying on glue. In harsh working conditions or long-term use, the shaft or the rotor body 3 will not fall off or slide due to the failure of glue. In addition, the connecting sleeve 4 in this embodiment is sleeved on the outer periphery of the rotor body 3 with interference fit, and the inner wall of the connecting sleeve 4 and the outer wall of the rotor body 3 are interference fit, which can improve the synchronization of the two during the rotation process. The rotor body 3 in this embodiment can be made of permanent magnet material (such as magnetic steel). The permanent magnet has a high magnetic energy density, so a small amount of permanent magnets can achieve the same magnetic power. This can not only reduce the volume of the motor, but also reduce the manufacturing cost.

[0047] In the embodiments of the present invention, please refer to Figures 3 to 5 , the connecting sleeve 4 includes a sleeve body 41 and a connecting portion 42, at least one end of the sleeve body 41 is provided with the connecting portion 42, and the outer diameter of the connecting portion 42 is smaller than the outer diameter of the sleeve body 41, and at least one of the first shaft member 1 and the second shaft member 2 is interference fit with the outer circumference of the connecting portion 42. That is to say, in this embodiment, a connecting portion 42 fixedly connected to one end of the sleeve body 41 is provided, and the outer circumference of the connecting portion 42 can be interference fit with the first shaft member 1 or the second shaft member 2; optionally, the connecting portion 42 can also be provided at both ends of the sleeve body 41, so that the first shaft member 1 and the second shaft member 2 are respectively interference fit with the connecting portion 42, for example, the connecting portions 42 at both ends can extend into the interior of the first shaft member 1 and the second shaft member 2, so that the outer wall of the connecting portion 42 abuts against the inner wall of the first shaft member 1 and the second shaft member 2, so that the interference fit between the connecting sleeve 4 and the first shaft member 1 and the second shaft member 2 can be achieved. It should be noted that the connection portion 42 may be partially or entirely connected with the two shaft members in an interference fit.

[0048] In the embodiments of the present invention, please refer to Figures 3 to 5The sleeve body 41 has a limiting surface 411. In this embodiment, the end surface of the sleeve body 41 facing the first shaft member 1 or the second shaft member 2 is defined as the limiting surface 411. When only one end of the sleeve body 41 is provided with a connecting portion 42, the end surface of the first shaft member 1 facing the sleeve body 41 may be in contact with the limiting surface 411, or the end surface of the second shaft member 2 facing the sleeve body 41 may be in contact with the limiting surface 411; when connecting portions 42 are provided at both ends of the sleeve body 41, there are two limiting surfaces 411 at this time, and the first shaft member 1 and the second shaft member 2 are respectively in contact with the above-mentioned two limiting surfaces 411, thereby improving the transmission of axial force between the connecting sleeve 4 and the two shaft members and ensuring the consistency of rotation.

[0049] In an embodiment of the utility model, the gap between at least one of the first shaft member 1 and the second shaft member 2 and the connecting sleeve 4 is filled with adhesive, and the adhesive is coated in the gap between the outer wall of the connecting sleeve 4 and the inner walls of the two shaft members. The adhesive is preferably a sealant, which can both enhance the fixing strength between the connecting sleeve 4 and the two shaft members and prevent dirt from penetrating into the interior of the shaft members through the gap and contaminating the rotor body 3.

[0050] In the embodiments of the present invention, please refer to Figure 3 and Figure 6 The first shaft member 1 includes a first shaft head 12 and a first barrel 11. The first shaft head 12 is arranged on the side of the first barrel 11 away from the second shaft member 2, and is mainly used to rotatably fix the micro motor on the supporting structure, so as to realize the rotation of the rotor. In addition, a first mounting hole 111 is arranged in the first barrel 11, and a first inner hole 121 communicating with the first mounting hole 111 is arranged in the first shaft head 12. Preferably, the first inner hole 121 extends along the axial direction of the first shaft head 12. In this way, when the rotor body 3 is pressed into the first mounting hole 111, the air between the rotor body 3 and the first mounting hole 111 can be discharged through the first inner hole 121, so as to avoid the air in the first mounting hole 111 from generating resistance to the rotor body 3 when it is pressed into.

[0051] In the embodiments of the present invention, please refer to Figure 3 and Figure 6The second shaft member 2 includes a second shaft head 22 and a second barrel 21. The second shaft head 22 is arranged on the side of the second barrel 21 away from the first shaft member 1, and can be used as an output end for driving and connecting with a target workpiece (such as a tool, etc.), thereby controlling the tool to achieve rotational cutting and other actions. In addition, a second mounting hole 211 is provided in the second barrel 21, and a second inner hole 221 connected to the second mounting hole 211 is provided in the second shaft head 22. Preferably, the second inner hole 221 extends along the axial direction of the second shaft head 22. In this way, when the rotor body 3 is pressed into the second mounting hole 211, the air between the rotor body 3 and the second mounting hole 211 can be discharged through the second inner hole 221, so as to avoid the air in the second mounting hole 211 from generating resistance to the rotor body 3 when it is pressed in.

[0052] In the embodiments of the present invention, please refer to Figure 6 , a central hole 31 is provided inside the rotor body 3, and the central hole 31 is arranged to penetrate along the axial direction of the rotor body 3, one end of the central hole 31 is connected to the first inner hole 121, and the other end of the central hole 31 is connected to the second inner hole 221. In this way, the central hole 31 is connected with the first inner hole 121 and the second inner hole 221 to form a channel extending along the rotation axis of the rotor body 3, and the channel can be used as a channel for fluid (liquid or gas) or a channel for solid (cable or imaging equipment, etc.), so that the rotor assembly 100 can be used in special occasions such as surgical power devices. Preferably, the aperture sizes of the central hole 31, the first inner hole 121 and the second inner hole 221 are equal, so that the solid or fluid placement space is consistent in the entire channel.

[0053] In the embodiments of the present invention, please refer to Figure 1 , Figure 2 and Figure 6 The outer diameter of the first shaft head 12 is smaller than the outer diameter of the first barrel 11, and a balancing block 5 is provided on the outer periphery of one end of the first shaft head 12 close to the first barrel 11. Preferably, the balancing block 5 is provided on the outer periphery of the connection between the first shaft head 12 and the first barrel 11. During long-term operation, the first shaft 1 will experience certain wear and fatigue, resulting in obvious vibration and noise. By adjusting the weight and position of the balancing block 5 outside the first shaft head 12, the balance between it and the second shaft 2 can be improved. Of course, in another embodiment, please refer to Figure 1 , Figure 2 and Figure 6The outer diameter of the second shaft head 22 is smaller than the outer diameter of the second barrel 21, and a balancing block 5 is also provided on the outer periphery of one end of the second shaft head 22 close to the second barrel 21. Preferably, the balancing block 5 is provided on the outer periphery of the connection between the second shaft head 22 and the second barrel 21. In this way, by adjusting the weight and position of the balancing blocks 5 on the two shaft heads, the dynamic balance between the two can be quickly achieved, and the imbalance between the two can be reduced to ensure the stable operation of the micromotor.

[0054] In the embodiments of the present invention, please refer to Figure 2 and Figure 3 , a first limiting shoulder 122 is provided on the first shaft head 12, and the first limiting shoulder 122 is provided at one end of the first shaft head 12 away from the second shaft member 2. The first limiting shoulder 122 can itself serve as a stop shoulder to position the first shaft member 1 axially, and stably fix it on the support structure, or a limiting member, such as a limiting bearing, can be provided on the outside to limit its axial movement, and prevent the first shaft member 1 from being separated from the support structure while rotating, thereby affecting the normal operation of the micromotor. Similarly, a second limiting shoulder 222 can also be provided on the second shaft head 22, and the second limiting shoulder 222 is provided at one end of the second shaft head 22 away from the first shaft member 1. The second limiting shoulder 222 can itself serve as a stop shoulder to position the second shaft member 2 axially, and stably connect it to the target workpiece, or a limiting member, such as a limiting bearing, can be provided on the outside to limit its axial movement, and prevent the second shaft member 2 from being separated from the target workpiece while rotating, thereby making the driving effect on the target workpiece ineffective.

[0055] The utility model also provides a medical micromotor, which includes a stator assembly and a rotor assembly 100 described in any of the above embodiments, wherein the rotor assembly 100 is arranged in the stator assembly. The specific structure of the rotor assembly 100 refers to the above embodiments. Since the medical micromotor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0056] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A rotor assembly, characterized in that: The rotor assembly comprises: A first shaft member having a first mounting hole arranged along its axial direction; A second shaft member is coaxially arranged with the first shaft member, the second shaft member has a second mounting hole arranged along its axial direction, and the opening of the first mounting hole and the opening of the second mounting hole are arranged opposite to each other; A connecting sleeve, wherein the connecting sleeve is disposed between the first shaft member and the second shaft member, and two ends of the connecting sleeve are respectively disposed to overlap with an end portion of the first shaft member and an end portion of the second shaft member; and The rotor body is inserted into the first mounting hole, the connecting sleeve and the second mounting hole, and the rotor body is covered by the first shaft, the connecting sleeve and the second shaft.

2. The rotor assembly according to claim 1, characterized in that The rotor body is inserted into the first mounting hole and the second mounting hole by interference fit; the connecting sleeve is sleeved on the outer circumference of the rotor body by interference fit; and the rotor body is a permanent magnet.

3. The rotor assembly according to claim 1, characterized in that The connecting sleeve comprises a sleeve body and a connecting portion, wherein the connecting portion is provided at at least one end of the sleeve body, and an outer diameter of the connecting portion is smaller than an outer diameter of the sleeve body, and at least one of the first shaft member and the second shaft member is interference fit with an outer circumferential surface of the connecting portion.

4. The rotor assembly according to claim 3, characterized in that The sleeve body has a limiting surface, and the limiting surface is the end surface of the sleeve body facing the first shaft member or the second shaft member; Wherein, the end surface of the first shaft member facing the sleeve body abuts against the limit surface; and / or the end surface of the second shaft member facing the sleeve body abuts against the limit surface.

5. The rotor assembly according to claim 4, characterized in that The gap between at least one of the first shaft member and the second shaft member and the connecting sleeve is filled with adhesive.

6. The rotor assembly according to any one of claims 1 to 5, characterized in that: The first shaft member includes a first shaft head and a first barrel portion, the first shaft head is arranged on a side of the first barrel portion away from the second shaft member, the first barrel portion is provided with the first mounting hole, and the first shaft head is provided with a first inner hole connected to the first mounting hole.

7. The rotor assembly according to claim 6, characterized in that The second shaft member includes a second shaft head and a second barrel portion, the second shaft head is arranged on a side of the second barrel portion away from the first shaft member, the second barrel portion is provided with the second mounting hole, and the second shaft head is provided with a second inner hole connected to the second mounting hole.

8. The rotor assembly according to claim 7, characterized in that A center hole is provided inside the rotor body, and the center hole is arranged to penetrate the rotor body along the axial direction. One end of the center hole is communicated with the first inner hole, and the other end of the center hole is communicated with the second inner hole.

9. The rotor assembly according to claim 7, characterized in that: The outer diameter of the first shaft head portion is smaller than the outer diameter of the first barrel portion, and a balancing block is provided on the outer periphery of one end of the first shaft head portion close to the first barrel portion; and / or, The outer diameter of the second shaft head portion is smaller than the outer diameter of the second barrel portion, and a balancing block is provided on the outer periphery of one end of the second shaft head portion close to the second barrel portion; and / or, The first shaft head is provided with a first limiting shoulder, and the first limiting shoulder is provided at an end of the first shaft head away from the second shaft member; and / or, The second shaft head portion is provided with a second limiting shaft shoulder, and the second limiting shaft shoulder is provided at an end of the second shaft head portion away from the first shaft member.

10. A medical micromotor, characterized in that: The medical micromotor comprises a stator assembly and a rotor assembly according to any one of claims 1 to 9, wherein the rotor assembly is disposed in the stator assembly.

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