Air-cooled micromotor and medical power handle

Abstract

The utility model relates to an air-cooled micromotor and a medical power handle, when the air-cooled micromotor is electrified and used, a rotating shaft and a permanent magnet rotate relative to a stator assembly so as to drive a fan blade on the rotating shaft to rotate, and air in an air gap is driven to flow through the rotation of the fan blade so as to drive the air to flow. Therefore, the heat of the stator winding, the loss of the rotor assembly in the rotation process and the heat generated by friction are absorbed by the flowing air and are discharged to the external atmosphere through the ventilation through holes, the heat of the micro motor can be effectively dissipated, and the heat dissipation efficiency is high. And moreover, the fan blades rotate to drive air to flow so as to dissipate heat, so that the fan can be suitable for a dry use environment, and the dry environment cannot be influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to an air-cooled micro-motor and a medical power handle. Background Art

[0002] Due to its small size and large output power, the micro-motor is a key component providing power source for surgical power devices and is widely used in power handles such as surgical drills, grinders, saws, mills, and planers. Because of its small size and large output power, the micro-motor generates a large amount of heat during operation. If the heat cannot be dissipated in a timely and effective manner, it will greatly affect the service life and performance of the micro-motor, and further affect the service life and performance of the power handle. The common heat dissipation means of the micro-motor are in the form of liquid cooling or air cooling, and the existing heat dissipation means have problems such as limited dry environment or low heat dissipation efficiency. Summary of the Utility Model

[0003] Based on this, in view of the problems of limited dry environment or low heat dissipation efficiency existing in the current heat dissipation means, it is necessary to provide an air-cooled micro-motor and a medical power handle.

[0004] The technical solution is as follows:

[0005] On the one hand, an air-cooled micro-motor is provided, including:

[0006] A rotor assembly, the rotor assembly includes a rotating shaft and a permanent magnet sleeved on a part of the outer peripheral wall of the rotating shaft;

[0007] A fan blade, the fan blade is sleeved on the rotating shaft; and

[0008] A stator assembly, the stator assembly includes a stator winding and a stator housing. The stator winding is sleeved on the outer peripheral side of the permanent magnet and is in clearance fit with the permanent magnet to form an air gap. The stator housing is sleeved on the outer peripheral side of the stator winding. The stator housing is provided with ventilation through holes radially corresponding to the fan blade, and the air gap, the fan blade and the ventilation through holes communicate with each other.

[0009] The technical solution is further described below:

[0010] In one embodiment, the stator assembly further includes a stator core. The stator core is sleeved on the outer peripheral side of the stator winding. The stator housing is sleeved on the outer peripheral side of the stator core and is tightly fitted with the stator core. The air-cooled micro-motor further includes a heat conduction element. The heat conduction element is in heat transfer cooperation with the stator core, and the heat conduction element extends to the communication part of the fan blade and the ventilation through hole.

[0011] In one embodiment, the stator housing includes a first heat-conducting housing and a second heat-conducting housing. The first heat-conducting housing is disposed in contact with the stator core. The second heat-conducting housing is disposed opposite to the first heat-conducting housing away from the stator core and is spaced from the first heat-conducting housing to form an installation cavity. The second heat-conducting housing is provided with the ventilation through holes. The heat-conducting element is partially disposed in the installation cavity so that the heat-conducting element is in heat transfer cooperation with the stator core through the first heat-conducting housing.

[0012] In one embodiment, the heat-conducting element has opposite first fitting arc surfaces and second fitting arc surfaces. The first fitting arc surface is disposed in surface contact with the first heat-conducting housing, and the second fitting arc surface is disposed in surface contact with the second heat-conducting housing.

[0013] In one embodiment, a first heat-conducting filling layer is provided between the first fitting arc surface and the first heat-conducting housing; and / or a second heat-conducting filling layer is provided between the second fitting arc surface and the second heat-conducting housing.

[0014] In one embodiment, there are at least two heat-conducting elements, and the at least two heat-conducting elements are disposed at intervals around the circumference of the stator core.

[0015] In one embodiment, along the axial direction of the rotating shaft, an air inlet is provided on one side of the stator housing away from the fan blade, and the air inlet is communicated with the air gap.

[0016] In one embodiment, when the fan blade rotates, a suction force is generated from the air inlet to the ventilation through holes.

[0017] In one embodiment, the rotating shaft has an output end and a support end opposite to the output end. The fan blade is sleeved on the support end, and the air inlet is disposed near the output end.

[0018] On the other hand, a medical power handle is provided, which includes an actuating element and the air-cooled micro motor as described above, and the air-cooled micro motor is in driving connection with the actuating element.

[0019] In the air-cooled micro motor and the medical power handle of the above embodiments, during the energized use of the air-cooled micro motor, the rotating shaft and the permanent magnet rotate relative to the stator assembly, thereby driving the fan blade on the rotating shaft to rotate. Through the rotation of the fan blade, the air flow in the air gap is driven, so that the heat of the stator winding, the loss during the rotation of the rotor assembly, and the heat generated by friction are absorbed by the flowing air and discharged to the outside atmosphere through the ventilation through holes. Furthermore, the micro motor can be effectively cooled, and the cooling efficiency is relatively high. And, the form of driving air flow through the rotation of the fan blade for cooling can be applied to a dry use environment and will not affect the dry environment. Brief Description of the Drawings

[0020] The drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 Axial sectional view of an air-cooled micro-motor for one embodiment;

[0023] Figure 2 For Figure 1 Structural schematic diagram of the rotor assembly of the air-cooled micro-motor;

[0024] Figure 3 For Figure 1 Cross-sectional view of the heat-conducting element of the air-cooled micro-motor.

[0025] Description of the reference numerals:

[0026] 10. Air-cooled micro-motor; 100. Rotor assembly; 110. Rotating shaft; 120. Permanent magnet; 200. Fan blade; 300. Stator assembly; 310. Stator winding; 320. Stator core; 330. Stator housing; 331. First heat-conducting housing; 332. Second heat-conducting housing; 340. Ventilation through-hole; 350. Air inlet; 400. Air gap; 500. Heat-conducting element; 510. First fitting arc surface; 520. Second fitting arc surface. Detailed Description of the Embodiments

[0027] In order to make the above objects, features, and advantages of the present utility model more obvious and understandable, the following detailed description of the specific embodiments of the present utility model will be given with reference to the drawings. Many specific details are set forth in the following description in order to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0028] When the traditional micro-motor uses liquid cooling for heat dissipation, its use is limited in a dry environment; when the traditional micro-motor uses air cooling for heat dissipation, heat dissipation is achieved through heat exchange between the housing and the air, and the heat dissipation efficiency is relatively low.

[0029] As Figure 1 shown, in one embodiment, a medical power handle is provided, which includes an actuating element (not shown) and an air-cooled micromotor 10. The air-cooled micromotor 10 is drivingly connected to the actuating element by means of a coupling or the like, so as to drive the actuating element to rotate and perform corresponding operations. Moreover, during the operation of the air-cooled micromotor 10, efficient heat dissipation can be achieved, and it is not limited by the usage scenario.

[0030] It should be noted that the actuating element can be any existing component capable of performing corresponding operations. For example, it can be a drill bit for performing bone drilling operations. Since it can be a component of the prior art, it will not be elaborated here.

[0031] As Figure 1 shown, in one embodiment, an air-cooled micromotor 10 is provided, which includes a rotor assembly 100, a fan blade 200, and a stator assembly 300.

[0032] As Figure 1 and Figure 2 shown, wherein the rotor assembly 100 includes a rotating shaft 110 and a permanent magnet 120 sleeved on a partial outer peripheral wall of the rotating shaft 110, so that the rotating shaft 110 and the permanent magnet 120 are integrated into a whole and rotate synchronously around the central axis of the rotating shaft 110.

[0033] It should be noted that the assembly form of the rotating shaft 110 and the permanent magnet 120 can be realized by using an existing assembly form.

[0034] As Figure 1 and Figure 2 shown, wherein the fan blade 200 is sleeved on the rotating shaft 110 by means of interference fit or the like, so that the fan blade 200 can rotate synchronously with the rotating shaft 110, and thus air flow can be generated.

[0035] Among them, the fan blade 200 can be in the form of a fan or a blade.

[0036] As Figure 1As shown in the figure, the stator assembly 300 includes a stator winding 310 and a stator housing 330. The stator winding 310 is sleeved on the outer peripheral side of the permanent magnet 120 and is in clearance fit with the permanent magnet 120 to form an air gap 400, so that the rotation of the permanent magnet 120 will not be interfered by the stator winding 310. Moreover, the stator housing 330 is sleeved on the outer peripheral side of the stator winding 310, so that when the stator winding 310 is energized, the permanent magnet 120 and the rotating shaft 110 can rotate around the central axis of the rotating shaft 110. In addition, the stator housing 330 is provided with ventilation through holes 340 that are radially corresponding to the fan blades 200, that is, along the radial direction of the rotating shaft 110, at least part of the projection of the fan blades 200 falls within the ventilation through holes 340. At the same time, the air gap 400, the fan blades 200, and the ventilation through holes 340 are interconnected, so that the air in the air gap is discharged to the outside atmosphere through the ventilation through holes 340 under the action of the fan blades 200.

[0037] For the air-cooled micro-motor 10 of the above embodiment, during the energized use process, the rotating shaft 110 and the permanent magnet 120 rotate relative to the stator assembly 300, thereby driving the fan blades 200 on the rotating shaft 110 to rotate. By the rotation of the fan blades 200, the air flow in the air gap 400 is driven, so that the heat of the stator winding 310, the losses during the rotation of the rotor assembly 100, and the heat generated by friction are absorbed by the flowing air and discharged to the outside atmosphere through the ventilation through holes 340. Furthermore, the micro-motor 10 can be effectively cooled, and the cooling efficiency is relatively high. In addition, the form of driving air flow by the rotation of the fan blades 200 for cooling can be applied to a dry use environment and will not affect the dry environment.

[0038] As Figure 1 shown, in one embodiment, the stator assembly 300 further includes a stator core 320. Among them, the stator core 320 is sleeved on the outer peripheral side of the stator winding 310, and the stator housing 330 is sleeved on the outer peripheral side of the stator core 320 and is fixedly fitted with the stator core 320. The air-cooled micro-motor 10 further includes a heat conduction element 500. Among them, the heat conduction element 500 is in heat transfer fit with the stator core 320, and the heat conduction element 500 extends to the connection part between the fan blades 200 and the ventilation through holes 340. In this way, the heat conduction element 500 can absorb the heat generated by the stator core 320 due to factors such as iron loss, copper loss, and resistance, and transfer the heat to one end of the corresponding ventilation through holes 340. Then, the air generated by the rotation of the fan blades 200 is used to air-cool the heat conduction element 500, and the ventilation through holes 340 are used to quickly dissipate the heat absorbed by the heat conduction element 500 to the outside atmosphere, further improving the cooling efficiency of the air-cooled micro-motor 10.

[0039] As Figure 1As shown, in one embodiment, the stator housing 330 includes a first heat-conducting housing 331 and a second heat-conducting housing 332. Optionally, the first heat-conducting housing 331 and the second heat-conducting housing 332 can be made of heat-conducting materials such as aluminum. Among them, the first heat-conducting housing 331 is attached to the stator core 320, so that the heat of the stator core 320 can be efficiently transferred to the first heat-conducting housing 331. The second heat-conducting housing 332 is disposed opposite to the first heat-conducting housing 331 away from the stator core 320 and is spaced from the first heat-conducting housing 331 to form an installation cavity. The second heat-conducting housing 332 is provided with ventilation through-holes 340. Part of the heat-conducting element 500 is disposed in the installation cavity so that the heat-conducting element 500 is in heat transfer cooperation with the stator core 320 through the first heat-conducting housing 331, so that the heat of the stator core 320 is transferred to the heat-conducting element 500 through the first heat-conducting housing 331 for heat dissipation. Moreover, the heat-conducting element 500 can also transfer part of the heat to the second heat-conducting housing 332 and use the heat exchange between the second heat-conducting housing 332 and the external atmosphere to achieve heat dissipation.

[0040] Among them, the first heat-conducting housing 331 and the second heat-conducting housing 332 can be made by an integral molding method.

[0041] As Figure 1 and Figure 3 shown, optionally, the heat-conducting element 500 has opposite first fitting arc surfaces 510 and second fitting arc surfaces 520. The first fitting arc surface 510 is in surface contact with the first heat-conducting housing 331, so that the first heat-conducting housing 331 and the heat-conducting element 500 are in surface contact with a large contact area, which is beneficial to heat transfer and improves the heat dissipation effect; the second fitting arc surface 520 is in surface contact with the second heat-conducting housing 332, so that the second heat-conducting housing 332 and the heat-conducting element 500 are in surface contact with a large contact area, which is beneficial to heat transfer and improves the heat dissipation effect.

[0042] In one embodiment, a first heat-conducting filling layer (not shown) is provided between the first fitting arc surface 510 and the first heat-conducting housing 331. In this way, the gap between the first fitting arc surface 510 and the first heat-conducting housing 331 can be filled by the first heat-conducting filling layer to ensure the heat conduction efficiency.

[0043] Among them, the first heat-conducting filling layer can be a filling layer such as heat-conducting silicone grease, and can be filled into the gap between the first fitting arc surface 510 and the first heat-conducting housing 331 by means of pressure injection or the like.

[0044] In one embodiment, a second heat-conducting filling layer (not shown) is provided between the second fitting arc surface 520 and the second heat-conducting housing 332. In this way, the gap between the second fitting arc surface 520 and the second heat-conducting housing 332 can be filled by the second heat-conducting filling layer to ensure the heat conduction efficiency.

[0045] Among them, the second heat-conducting filling layer can be a filling layer such as heat-conducting silicone grease, and can be filled into the gap between the second fitting arc surface 520 and the second heat-conducting housing 332 by means of pressure injection or the like.

[0046] Of course, the first heat-conducting filling layer and the second heat-conducting filling layer can be set simultaneously.

[0047] Optionally, there are at least two heat-conducting elements 500, and the at least two heat-conducting elements 500 are arranged at intervals around the circumference of the stator core 320. In this way, the heat of the stator core 320 is quickly absorbed by arranging the at least two heat-conducting elements 500 around the circumference of the stator core 320, which is beneficial to the rapid heat dissipation of the stator core 320.

[0048] It should be noted that the specific number of the heat-conducting elements 500 can be flexibly designed or adjusted according to actual use requirements. For example, it can be two, three or more. The number of the heat-conducting elements 500 corresponds to the number of the ventilation through holes 340.

[0049] As Figure 1 shown, in one embodiment, along the axial direction of the rotating shaft 110, an air inlet 350 is provided on the side of the stator housing 330 away from the fan blade 200, and the air inlet 350 is communicated with the air gap 400. In this way, when the fan blade 200 rotates, the air with a lower temperature from the outside enters the air gap 400 through the air inlet 350, exchanges heat with the permanent magnet 120 and the stator winding 310, and then flows out to the outside atmosphere through the ventilation through hole 340, which can effectively dissipate heat and cool the permanent magnet 120 and the stator winding 310, and the heat dissipation efficiency is high.

[0050] Specifically, when the fan blade 200 rotates, a suction force is generated along the air inlet 350 to the ventilation through hole 340, so that the air flows in the air inlet 350, the air gap 400 and the ventilation through hole 340, and further realizes the heat dissipation of the permanent magnet 120 and the stator winding 310.

[0051] In one embodiment, the rotating shaft 110 has an output end and a support end opposite to the output end, the fan blade 200 is sleeved on the support end, and the air inlet 350 is arranged close to the output end. In this way, the ventilation through hole 340 and the air inlet 350 are respectively located at opposite ends of the rotating shaft 110, so that when the fan blade 200 rotates, the air enters the air gap 400 from one end of the rotating shaft 110, completes heat exchange, and then flows out from the other end of the rotating shaft 110, which prolongs the contact time between the air and the heat-generating components and is beneficial to improving the heat dissipation efficiency.

[0052] It should be noted that "a certain body" and "a certain part" can be a part of the corresponding "component", that is, "a certain body" and "a certain part" are integrally formed with the "other parts of the component"; they can also be an independent component separable from the "other parts of the component", that is, "a certain body" and "a certain part" can be manufactured independently and then combined with the "other parts of the component" to form a whole. The expression of "a certain body" and "a certain part" in this application is only one embodiment for the convenience of reading, rather than a limitation on the scope of protection of this application. As long as the above features are included and the functions are the same, it should be understood as an equivalent technical solution of this application.

[0053] It should be noted that the components included in the "unit", "component", "mechanism", and "device" of this application can also be flexibly combined, that is, modular production can be carried out according to actual needs to facilitate modular assembly. The division of the above components in this application is only one embodiment for the convenience of reading, rather than a limitation on the scope of protection of this application. As long as the above components are included and the functions are the same, it should be understood as an equivalent technical solution of this application.

[0054] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the present utility model. The term "and / or" used in the present utility model includes any and all combinations of one or more of the related listed items.

[0055] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0056] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "attachment", "fixation", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication between two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0057] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal level than the second feature.

[0058] It should be noted that when an element is referred to as being "fixed to", "arranged on", "secured to" or "mounted on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. Further, when an element is considered to be "fixedly drivingly connected" to another element, the two can be fixed in a detachable connection manner or a non-detachable connection manner, as long as power transmission can be achieved, such as socket connection, snap connection, integral molding fixation, welding, etc., which can be achieved in the prior art and will not be elaborated here. When an element is perpendicular or approximately perpendicular to another element, it means that the ideal state of the two is perpendicular, but due to the influence of manufacturing and assembly, there can be a certain perpendicular error. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation mode. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0059] It should also be understood that when interpreting the connection relationship or position relationship of elements, although not explicitly described, the connection relationship and position relationship are interpreted to include an error range, and this error range should be within the acceptable deviation range of a specific value determined by those skilled in the art. For example, "about", "approximate" or "substantially" can mean within one or more standard deviations, which will not be limited here.

[0060] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered that the scope recorded in this specification.

[0061] The above embodiments only express several implementation manners of the present utility model, and the description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.

Claims

1. An air-cooled micro-motor, characterized in that, Comprising: A rotor assembly, the rotor assembly including a rotating shaft and a permanent magnet sleeved on a part of the outer peripheral wall of the rotating shaft; A fan blade, the fan blade sleeved on the rotating shaft; And A stator assembly, the stator assembly including a stator winding and a stator housing, the stator winding sleeved on the outer peripheral side of the permanent magnet and in clearance fit with the permanent magnet to form an air gap, the stator housing sleeved on the outer peripheral side of the stator winding, the stator housing being provided with ventilation through holes radially corresponding to the fan blade, and the air gap, the fan blade and the ventilation through holes being in communication with each other.

2. The air-cooled micro-motor according to claim 1, wherein The stator assembly further includes a stator core, the stator core sleeved on the outer peripheral side of the stator winding, the stator housing sleeved on the outer peripheral side of the stator core and in fastening fit with the stator core; the air-cooled micro-motor further includes a heat conducting element, the heat conducting element in heat transfer fit with the stator core, and the heat conducting element extending to the communication part of the fan blade and the ventilation through holes.

3. The air-cooled micro-motor according to claim 2, characterized in that, The stator housing includes a first heat conducting housing and a second heat conducting housing, the first heat conducting housing being arranged in contact with the stator core, the second heat conducting housing being arranged opposite to the first heat conducting housing and away from the stator core and spaced from the first heat conducting housing to form an installation cavity, the second heat conducting housing being provided with the ventilation through holes, and the heat conducting element being partially arranged in the installation cavity so that the heat conducting element is in heat transfer fit with the stator core through the first heat conducting housing.

4. The air-cooled micro-motor according to claim 3, characterized in that, The heat conducting element has opposite first fitting arc surfaces and second fitting arc surfaces, the first fitting arc surfaces being in surface contact with the first heat conducting housing, and the second fitting arc surfaces being in surface contact with the second heat conducting housing.

5. The air-cooled micromotor according to claim 4, characterized in that, A first heat conducting filling layer is provided between the first fitting arc surfaces and the first heat conducting housing; and / or a second heat conducting filling layer is provided between the second fitting arc surfaces and the second heat conducting housing.

6. The air-cooled micromotor according to claim 2, wherein, There are at least two heat conducting elements, and at least two heat conducting elements are arranged at intervals around the circumference of the stator core.

7. The air-cooled micromotor according to any one of claims 1 to 6, characterized in that, Axially along the rotating shaft, an air inlet is provided on a side of the stator housing away from the fan blade, and the air inlet is in communication with the air gap.

8. The air-cooled micro-motor according to claim 7, wherein, When the fan blade rotates, a suction force is generated from the air inlet to the ventilation through holes.

9. The air-cooled micromotor according to claim 7, characterized in that, The rotating shaft has an output end and a support end opposite to the output end, the fan blade is sleeved on the support end, and the air inlet is arranged close to the output end.

10. A medical power handle, characterized in that, Comprising an actuating element and the air-cooled micro-motor according to any one of claims 1 to 9, the air-cooled micro-motor being in driving connection with the actuating element.

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