Micromotor rotor and medical micromotor
By adopting a one-stage rotor structure and positioning part design in the micromotor rotor, the problems of coaxial degree and dynamic balance in the existing micromotor rotor are solved, and higher coaxial accuracy and smoother operation are achieved.
Patent Information
- Application Number
- CN202421498388.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-27
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-06-27
AI Technical Summary
The two-stage rotor structure of existing micromotor rotors leads to coaxial difference and dynamic balance, which increases the vibration and noise of the motor and affects the performance of the motor.
A one-stage rotary shaft structure is adopted, and a first through hole penetrates through the axial direction inside the rotor body, the rotary shaft is penetrated into the first through hole, and the rotary shaft is circumferentially connected to the first through hole; a positioning member is provided at one end of the rotary shaft, and the positioning member abuts the end of the rotor body to define the axial position of the rotor body.
The coaxial accuracy between the rotor body and the shaft is improved, imbalance is reduced, and the micromotor runs more smoothly, especially on high-speed micromotors.
Smart Images
Figure CN222839470U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of micromotors, in particular to a micromotor rotor and a medical micromotor. Background Art
[0002] Micromotors are often used in handheld surgical power devices due to their small size, high speed, light weight, and no cogging torque. Existing micromotors usually include a stator with multiple coils and a rotor disposed inside the stator, and the rotor 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] The existing shaft structure is usually divided into two parts, the magnetic ring section and the output section, which are processed separately, and the two sections are respectively arranged at the two ends of the rotor body. This two-section shaft structure is not only complicated to assemble, but also leads to poor coaxiality between the two sections of the shaft and the rotor body, resulting in poor dynamic balance of the rotor, increasing the vibration and noise of the motor, and affecting the motor performance. Utility Model Content
[0004] The main purpose of the utility model is to provide a micromotor rotor and a medical micromotor, aiming to solve the problems of low coaxiality and large unbalance between the existing two-section rotating shaft and the rotor body.
[0005] In order to achieve the above-mentioned purpose, the micro motor rotor proposed in the present invention comprises:
[0006] The rotor body is in a columnar shape and has a first through hole extending therethrough in its axial direction;
[0007] A rotating shaft is disposed in the first through hole, and the rotating shaft and the first through hole are circumferentially limited and matched; and
[0008] A positioning member is arranged at one end of the rotating shaft, the positioning member protrudes from the outer circumference of the rotating shaft, and the positioning member abuts against the end of the rotor body to limit the axial position of the rotor body.
[0009] In one embodiment, the positioning member and the rotating shaft are integrally formed.
[0010] In one embodiment, the positioning member has a first section of protrusion and a second section of protrusion adjacent to each other, the first section of protrusion is arranged close to the rotor body, the second section of protrusion is arranged away from the rotor body, and the first section of protrusion abuts against an end of the rotor body.
[0011] In one embodiment, the micromotor rotor further includes a rotor sleeve having a second through hole extending axially therethrough, the rotor body is inserted into the second through hole to be covered by the rotor sleeve, and the rotor body is interference fit with the rotor sleeve.
[0012] In one embodiment, the outer diameter of the first protrusion is smaller than the outer diameter of the second protrusion to form a step at the connection between the two, the rotor sleeve and the first protrusion are interference fit, and the second protrusion abuts against the end of the rotor sleeve.
[0013] In one embodiment, the rotor sleeve is provided with a first limiting shoulder, and the first limiting shoulder is provided at an end of the rotor sleeve away from the positioning member.
[0014] In one embodiment, the rotating shaft is provided with a stopper, the stopper is provided at an end of the rotating shaft away from the positioning member, and the outer diameter of the stopper is greater than the inner diameter of the first through hole.
[0015] In one embodiment, the rotating shaft includes a shaft body and an output end and a support end respectively arranged at both ends of the shaft body, the positioning member is arranged at one end of the shaft body close to the support end, and the outer diameters of the output end and the support end are both smaller than the outer diameter of the shaft body.
[0016] In one embodiment, the output end is provided with a mounting socket, and the mounting socket is provided on a side of the output end away from the shaft body and extends toward a direction close to the shaft body.
[0017] In one embodiment, the shaft body is provided with a second limiting shoulder, and the second limiting shoulder is provided at one end of the shaft body close to the supporting end.
[0018] In one embodiment, a center hole is provided inside the rotating shaft, and the center hole is arranged to penetrate along the axial direction of the rotating shaft.
[0019] The utility model also provides a medical micromotor, which comprises a micromotor stator and a micromotor rotor described in any one of the above embodiments, wherein the micromotor rotor is arranged in the micromotor stator.
[0020] In the technical solution of the utility model, a first through hole is provided inside the rotor body and penetrates along the axial direction thereof, and the rotating shaft is provided in the first through hole, and the rotating shaft and the first through hole are circumferentially limited; in addition, a positioning member is provided at one end of the rotating shaft, and the positioning member is provided to protrude from the outer peripheral surface of the rotating shaft, so that the surface of the positioning member abuts against the end surface of the rotor body, thereby limiting the axial position of the rotor body in the rotating shaft and avoiding relative sliding in the axial direction. Since the positioning member is provided between the rotating shaft and the rotor body, it is ensured that the rotating shaft and the rotor body have a certain fixing strength. Compared with the situation where the rotor body is fixed separately by two sections of the rotating shaft, the coaxial accuracy of the assembly of the one-section rotating shaft and the rotor body in this solution will be significantly improved, and there is no need to adjust the balance between the two sections of the shaft in a time-consuming and laborious manner, and the unbalance amount of the micromotor rotor is small, and the micromotor will run more smoothly, especially in high-speed micromotors. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] 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.
[0022] Figure 1 A schematic structural diagram of an embodiment of a micromotor rotor provided by the utility model;
[0023] Figure 2 A structural cross-sectional view of an embodiment of a micromotor rotor provided by the utility model;
[0024] Figure 3 for Figure 2 A partial enlarged view of the middle A;
[0025] Figure 4 An exploded view of the structure of another embodiment of the micromotor rotor provided by the utility model;
[0026] Figure 5 This is a schematic structural diagram of a rotating shaft in yet another embodiment of a micromotor rotor provided by the utility model.
[0027] Description of Figure Numbers:
[0028] 100. Micromotor rotor; 1. Rotor body; 11. First through hole; 2. Rotating shaft; 20. Center hole; 21. Shaft body; 211. Stopper; 212. Second limit shoulder; 22. Output end; 221. Mounting socket; 23. Support end; 3. Positioning member; 31. First section convex portion; 32. Second section convex portion; 33. Step; 4. Rotor sleeve; 41. Second through hole; 42. First limit shoulder.
[0029] 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
[0030] 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.
[0031] 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.
[0032] 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.
[0033] The existing shaft structure is usually divided into two parts, the magnetic ring section and the output section, which are processed separately, and the two sections are respectively arranged at the two ends of the rotor body. This two-section shaft structure is not only complicated to assemble, but also leads to poor coaxiality between the two sections of the shaft and the rotor body, resulting in poor dynamic balance of the rotor, increasing the vibration and noise of the motor, and affecting the motor performance.
[0034] The utility model provides a micro motor rotor.
[0035] See also Figure 1 and Figure 2 In one embodiment of the present utility model, the micro motor rotor 100 includes:
[0036] The rotor body 1 is in a columnar shape and has a first through hole 11 extending therethrough in the axial direction;
[0037] The rotating shaft 2 is inserted into the first through hole 11, and the rotating shaft 2 and the first through hole 11 are circumferentially limited and matched; and
[0038] The positioning member 3 is disposed at one end of the rotating shaft 2 . The positioning member 3 is disposed protruding from the outer circumference of the rotating shaft 2 . The positioning member 3 abuts against the end of the rotor body 1 to limit the axial position of the rotor body 1 .
[0039] In the technical solution of the utility model, a first through hole 11 is provided inside the rotor body 1 and penetrates along the axial direction thereof, and the rotating shaft 2 is provided in the first through hole 11, and the rotating shaft 2 and the first through hole 11 are circumferentially limited; in addition, a positioning member 3 is also provided at one end of the rotating shaft 2, and the positioning member 3 is provided to protrude from the outer peripheral surface of the rotating shaft 2, so that the surface of the positioning member 3 abuts against the end surface of the rotor body 1, thereby limiting the axial position of the rotor body 1 in the rotating shaft 2, and avoiding relative sliding in the axial direction. Since the positioning member 3 is provided between the rotating shaft 2 and the rotor body 1, it is ensured that the rotating shaft 2 and the rotor body 1 have a certain fixing strength. Compared with the situation where the rotor body 1 is fixed separately by two sections of the rotating shaft 2, the coaxial accuracy of the assembly of the one-stage rotating shaft 2 and the rotor body 1 in this solution will be significantly improved, and there is no need to adjust the balance between the two sections of the shaft in a time-consuming and laborious manner, and the unbalance amount of the micromotor rotor 100 is small, and the micromotor will run more smoothly, especially in high-speed micromotors.
[0040] Specifically, in this embodiment, the aperture size of the first through hole 11 is not specifically limited, as long as it is not less than the outer diameter of the shaft 2 and can accommodate the shaft 2, for example, the first through hole 11 and the shaft 2 are tightly fitted or loosely fitted. It should be noted that the length of the shaft 2 is greater than the length of the rotor body 1, so that the ends of the shaft 2 extend from both ends of the rotor body 1, firstly, to facilitate the installation of the positioning member 3 at one end of the shaft 2 extending out, and secondly, to use the other end of the shaft 2 extending out as the output end 22 and to be fixed to the target part. In addition, if there is a clearance fit between the first through hole 11 and the rotating shaft 2, then in order to improve the connection strength between the rotating shaft 2 and the rotor body 1 and achieve circumferential limit fit, an adhesive may be filled in the gap between the outer wall of the rotating shaft 2 and the inner wall of the rotor body 1. The adhesive is preferably a sealant, which can both enhance the connection strength between the rotating shaft 2 and the rotor body 1 and prevent dirt from penetrating through the gap into the first through hole 11 and adhering to the inner wall of the rotor body 1, causing it to demagnetize, thereby creating resistance to its rotation and affecting the rotation of the rotor.
[0041] In the embodiments of the present invention, please refer to Figure 4 and Figure 5 The positioning member 3 is integrally formed with the rotating shaft 2. The positioning member 3 and the rotating shaft 2 are processed by an integral molding process, such as injection molding, extrusion molding or hot pressing molding, which can reduce the number of parts and assembly processes, and also reduce the number of parts that need to be fixed and connected. It should be noted that there is no specific limitation on the specific structure of the positioning member 3. The positioning member 3 can be an annular protrusion arranged on the outer periphery of the rotating shaft 2, or a limiting structure partially protruding from the outer periphery of the rotating shaft 2, as long as it can play the role of axial limiting the rotor body 1.
[0042] In the embodiments of the present invention, please refer to Figure 3 and Figure 5 The positioning member 3 has a first section convex portion 31 and a second section convex portion 32 adjacent to each other. The first section convex portion 31 is arranged close to the rotor body 1, and the second section convex portion 32 is arranged away from the rotor body 1. The first section convex portion 31 abuts against the end of the rotor body 1. The end face of the first section convex portion 31 abuts against the end face of the rotor body 1, which can improve the limiting effect on one end of the rotor body 1 in the axial direction, and effectively prevent the rotor body 1 from sliding in the axial direction of the rotating shaft 2.
[0043] In the embodiments of the present invention, please refer to Figure 1 , Figure 2 and Figure 4The micromotor rotor 100 further includes a rotor sleeve 4, which has a second through hole 41 extending in the axial direction thereof. The rotor body 1 is disposed in the second through hole 41 so as to be covered by the rotor sleeve 4, and the rotor body 1 is interference fit with the rotor sleeve 4. At this time, the other end of the rotor body 1 is clamped inside the rotor sleeve 4 and cannot slide in the axial direction of the rotating shaft 2. In this way, the rotor sleeve 4 firmly wraps the rotor body 1 inside and then interference fits with the rotating shaft 2 and the positioning member 3, thereby improving the connection strength between the various components in the entire micromotor rotor 100 structure. In this embodiment, there is no need to fill the gap between the outer wall of the rotating shaft 2 and the inner wall of the rotor body 1 with adhesive. The connection strength is mainly provided by the interference fit between the rotating shaft 2, the positioning member 3 and the rotor body 1 and the rotor sleeve 4, rather than mainly relying on adhesive. In this way, even in harsh working conditions or long-term use, the rotating shaft 2 and the rotor body 1 will not fall off or slide due to glue failure.
[0044] In the embodiments of the present invention, please refer to Figure 2 and Figure 3 The outer diameter of the first section protrusion 31 is smaller than the outer diameter of the second section protrusion 32. There is no specific limit on the specific difference between the outer diameters of the first section protrusion 31 and the second section protrusion 32, as long as a step 33 can be formed at the connection between the first section protrusion 31 and the second section protrusion 32. In this way, the end face of the first section protrusion 31 away from the second section protrusion 32 abuts against the end face of the rotor body 1, the inner wall of the rotor sleeve 4 is interference-fitted with the outer surface of the step 33, and the end face of the connection between the second section protrusion 32 and the first section protrusion 31 abuts against the end face of the rotor sleeve 4. Through the interference fit between the rotor sleeve 4 and the rotor body 1 and the interference fit of the step 33 on the positioning member 3, the connection strength between the various components in the entire structure can be further improved, thereby improving the stability of the micromotor rotor 100 during rotation and reducing the vibration and noise generated during the operation of the micromotor.
[0045] In the embodiments of the present invention, please refer to Figure 2 The rotor sleeve 4 is provided with a first limiting shoulder 42, and the first limiting shoulder 42 is provided at one end of the rotor sleeve 4 away from the positioning member 3. In this way, a limiting member, such as a limiting bearing, can be installed outside the first limiting shoulder 42 to limit the axial movement of the rotor sleeve 4, thereby avoiding a large displacement of the rotor sleeve 4 in the axial direction during rotation and preventing a large friction between it and the external structure.
[0046] In the embodiments of the present invention, please refer to Figure 5The shaft 2 is provided with a stopper 211, which is provided at one end of the shaft 2 away from the positioning member 3, and the outer diameter of the stopper 211 is greater than the inner diameter of the first through hole 11, so that the rotor body 1 can be confined between the stopper 211 and the positioning member 3 to prevent it from sliding back and forth in the axial direction of the shaft 2 during rotation. In this embodiment, the shape of the stopper 211 is not specifically limited, and it can be, for example, an annular protrusion provided in the circumferential direction of the shaft 2.
[0047] In the embodiments of the present invention, please refer to Figure 5 The rotating shaft 2 includes a shaft body 21 and an output end 22 and a support end 23 respectively arranged at both ends of the shaft body 21. The positioning member 3 is arranged at one end of the shaft body 21 close to the support end 23, and the outer diameters of the output end 22 and the support end 23 are both smaller than the outer diameter of the shaft body 21. In this way, the support end 23 is extended in the axial direction outside the rotor body 1, which is convenient for rotatably supporting the micro motor on the bracket, thereby realizing the rotation of the rotor; the output end 22 is extended in the axial direction outside the other end of the rotor body 1, and is drivingly connected to the target workpiece to be driven.
[0048] In the embodiments of the present invention, please refer to Figure 5 The output end 22 is provided with a mounting socket 221, which is provided at a side of the output end 22 away from the shaft body 21 and extends toward the direction close to the shaft body 21. The output end 22 is provided with the mounting socket 221, so that the target workpiece (such as a tool, etc.) can be plugged into the output end 22, and the operation is simple. It is suitable for driving a variety of different target workpieces. When replacing the target workpiece, it only needs to be plugged into the mounting socket 221. The disassembly and assembly process is simple and efficient.
[0049] In the embodiments of the present invention, please refer to Figures 1 to 3 The shaft body 21 is provided with a second limiting shoulder 212, and the second limiting shoulder 212 is provided at one end of the shaft body 21 close to the support end 23. The second limiting shoulder 212 can itself serve as a shoulder to axially position the rotating shaft 2 and stably fix it on the supporting structure. A limiting member, such as a limiting bearing, can also be provided on the outside to limit its axial movement to prevent the rotating shaft 2 from separating from the supporting structure while rotating, thereby affecting the normal operation of the micromotor.
[0050] In the embodiments of the present invention, please refer to Figure 2 and Figure 4, a center hole 20 is provided inside the rotating shaft 2, and the center hole 20 is set to penetrate along the axial direction of the rotating shaft 2, and there is no specific limitation on the size and shape of the center hole 20. In this way, the center hole 20 forms an extended channel along the rotating axis 2 of the rotating shaft 2, and the channel can be used as a channel for fluid (liquid or gas) or a channel for objects (cables or optical fibers, etc.), so that the micromotor rotor 100 can be used in special occasions such as surgical power devices. It can be seen that the one-stage rotating shaft structure of the present application has another obvious beneficial effect compared to the two-stage rotating shaft structure in the prior art: a hole channel of the center hole 20 can be formed on the rotating shaft 2 as a whole without splicing, and when it is used in a power device with tissue fluid suction function such as a planing handle, there will be no problem of leakage and erosion of the inside of the micromotor rotor, thereby improving the reliability of the micromotor.
[0051] The utility model also proposes a medical micromotor, which includes a micromotor stator and a micromotor rotor described in any of the above embodiments. The micromotor rotor is arranged in the micromotor stator. The specific structure of the micromotor rotor 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 repeated here one by one.
[0052] 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 micromotor rotor, characterized in that: The micromotor rotor comprises: The rotor body is in a columnar shape and has a first through hole extending therethrough in its axial direction; A rotating shaft is disposed in the first through hole, and the rotating shaft and the first through hole are circumferentially limited and matched; and A positioning member is arranged at one end of the rotating shaft, the positioning member protrudes from the outer circumference of the rotating shaft, and the positioning member abuts against the end of the rotor body to limit the axial position of the rotor body.
2. The micromotor rotor according to claim 1, characterized in that: The positioning member and the rotating shaft are integrally formed.
3. The micromotor rotor according to claim 2, characterized in that: The positioning member has a first section of protrusion and a second section of protrusion adjacent to each other, wherein the first section of protrusion is arranged close to the rotor body, the second section of protrusion is arranged away from the rotor body, and the first section of protrusion abuts against an end of the rotor body.
4. The micromotor rotor according to claim 3, characterized in that: The micromotor rotor further comprises a rotor sleeve having a second through hole extending axially therethrough, the rotor body is inserted into the second through hole to be covered by the rotor sleeve, and the rotor body and the rotor sleeve are interference fit.
5. The micromotor rotor according to claim 4, characterized in that: The outer diameter of the first section convex portion is smaller than the outer diameter of the second section convex portion to form a step at the connection between the two sections, the rotor sleeve and the first section convex portion are interference fit, and the second section convex portion abuts against the end of the rotor sleeve; And / or, the rotor sleeve is provided with a first limiting shoulder, and the first limiting shoulder is provided at an end of the rotor sleeve away from the positioning member.
6. The micromotor rotor according to claim 1, characterized in that: The rotating shaft is provided with a stopper, the stopper is arranged at one end of the rotating shaft away from the positioning member, and the outer diameter of the stopper is greater than the inner diameter of the first through hole.
7. The micromotor rotor according to any one of claims 1 to 6, characterized in that: The rotating shaft includes a shaft body and an output end and a support end respectively arranged at both ends of the shaft body, the positioning member is arranged at one end of the shaft body close to the support end, and the outer diameters of the output end and the support end are both smaller than the outer diameter of the shaft body.
8. The micromotor rotor according to claim 7, characterized in that: The output end is provided with a mounting socket, the mounting socket is provided at a side of the output end away from the shaft body and extends toward a direction close to the shaft body; and / or, The shaft body is provided with a second limiting shoulder, and the second limiting shoulder is arranged at one end of the shaft body close to the supporting end.
9. The micromotor rotor according to any one of claims 1 to 6, characterized in that: A central hole is arranged inside the rotating shaft, and the central hole is arranged to penetrate along the axial direction of the rotating shaft.
10. A medical micromotor, characterized in that: The medical micromotor comprises a micromotor stator and a micromotor rotor as claimed in any one of claims 1 to 9, wherein the micromotor rotor is disposed in the micromotor stator.