Rapid heat dissipation type external rotor motor with external bearing
By placing the bearings outside the rotor housing in an external rotor motor and utilizing the bearing slots for rapid heat dissipation, the heat dissipation and stability issues of the external rotor motor are solved, achieving high performance and quiet rotation of the motor, and simplifying the manufacturing and assembly process.
Patent Information
- Application Number
- CN202520329721.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-27
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-02-27
AI Technical Summary
Conventional external rotor motors have shortcomings in heat dissipation and stability, especially in the field of fans, where excessive bearing temperature leads to abnormal noise problems.
The bearings are placed outside the rotor housing, and the bearing slots at both ends of the rotor housing allow the bearings to be located on the outside, so as to make the external environment heat up quickly. The bearings are assembled by means of interference fit and snap-fit connection, which simplifies manufacturing and assembly.
It achieves stable and high-performance output of the motor, avoids abnormal noise caused by excessive temperature, ensures smooth rotation of the motor shaft, and simplifies the processing and assembly process.
Smart Images
Figure CN223957375U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to motor technical field, especially relates to a bearing external quick heat dissipation formula outer rotor motor. BACKGROUND
[0002] Generally speaking, the outer rotor motor has more advantages in heat dissipation, torque, stability and other performances compared with the inner rotor motor. The conventional outer rotor motor usually includes a motor base, a motor shaft, a permanent magnet, a rotor shell, a stator and the like, the stator is fixedly connected with the motor base and is arranged in the inner layer, the permanent magnet is arranged in the outer layer of the stator and can rotate relative to the stator, the rotor shell is fixedly connected with the permanent magnet to rotate synchronously with the permanent magnet, the motor shaft is arranged in the shaft hole of the motor base and is usually rotatably connected with the motor base through a bearing, and the motor shaft is fixedly connected with the rotor shell, so that the rotor shell rotates to drive the motor shaft to rotate synchronously to form motor output. The stability and heat dissipation performance of the outer rotor motor still need to be further improved, especially in the fan field, the bearing causes abnormal sound problem due to high temperature. SUMMARY
[0003] The utility model aims at the deficiency in the above background art, and provides an outer rotor motor with improved stability and heat dissipation performance by bearing externalization.
[0004] In order to achieve the above purpose, the utility model provides a bearing external quick heat dissipation formula outer rotor motor, including motor shaft, stator, permanent magnet, rotor shell, bearing, the stator is arranged in the inner layer, the permanent magnet is arranged around the outer layer of the stator, the rotor shell is arranged in the outer layer of the permanent magnet and is fixedly connected with the permanent magnet, the motor shaft is arranged in the shaft hole of the stator, the end of the rotor shell is provided with a perforation, the end of the motor shaft is arranged in the perforation, the end of the rotor shell is provided with a bearing groove, the bearing groove is arranged in an open manner, the bearing is arranged in the bearing groove, the outer ring of the bearing is fixedly connected with the bearing groove, the inner ring of the bearing is fixedly connected with the motor shaft, in the stationary coordinate system, the rotor shell is fixedly arranged, the stator rotates relative to the permanent magnet and the rotor shell after being electrified, and the motor shaft rotates synchronously with the stator.
[0005] Further, the first end and the second end of the rotor shell are both provided with the perforation, and the first end and the second end of the rotor shell are both provided with the bearing groove.
[0006] Further, the motor shaft is also provided with a wire hole, and the connecting wire of the stator enters the inside of the motor shaft from the wire hole and then passes out from the end of the motor shaft.
[0007] Further, the rotor shell is in interference fit with the permanent magnet.
[0008] Further, the bearing outer ring of the bearing is in interference fit with the bearing groove, and the bearing inner ring is in interference fit with the first end or the second end of the motor shaft.
[0009] Further, the stator is in interference fit with the motor shaft or is kept synchronous rotation by a shaft key.
[0010] Further, the rotor housing is spliced by two half housings along the direction of the motor shaft.
[0011] Further, the splicing part of the two half housings is respectively provided with a buckle and a clamping groove, and the buckle is inserted into the clamping groove to realize the assembly of the rotor housing.
[0012] The above scheme of the utility model has the following beneficial effects:
[0013] The bearing outer quick heat dissipation type outer rotor motor provided by the utility model realizes that the bearing supporting the motor shaft is located outside the rotor housing through the setting of the bearing grooves at the two ends of the rotor housing, heat can be transferred to the outside environment more quickly, the heat generated by the bearing can be dissipated in time, the problem of abnormal sound caused by too high temperature does not occur, the stable and high performance output of the motor is ensured, the stable and quiet rotation of the motor shaft is ensured, and in addition, the processing and manufacturing are relatively simple, and the assembly efficiency is high.
[0014] Other beneficial effects of the utility model will be described in detail in the following specific implementation mode part. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 It is a whole structure schematic view of the utility model;
[0016] Figure 2 It is a sectional view of Figure 1
[0017] Figure 3 It is a rotor housing schematic view of the utility model.
[0018] EXPLANATION OF REFERENCE NUMERALS
[0019] 1-motor shaft; 2-stator; 3-permanent magnet; 4-rotor housing; 5-bearing; 6-bearing groove; 7-connection line; 8-buckle; 9-clamping groove. DETAILED DESCRIPTION
[0020] In order to make the technical problems, technical solutions and advantages to be solved by the utility model more clear, the following will be described in detail in combination with the drawings and specific embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without making creative labor belong to the protection scope of the utility model. In addition, the technical features involved in different embodiments of the utility model described below can be combined with each other as long as they do not conflict with each other.
[0021] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0022] In the description of the utility model, it needs to be explained that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be a locking connection, or it can be a detachable connection, or it can be integrally connected, it can be mechanical connection, or it can be electrical connection, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements. For the ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0023] As shown in Figure 1 , Figure 2 The embodiment of the utility model provides a bearing external quick heat dissipation type outer rotor motor, including motor shaft 1, stator 2, permanent magnet 3, rotor shell 4, bearing 5. Among them, the stator 2 is arranged in the inner layer, the permanent magnet 3 and the rotor shell 4 form the rotor, the permanent magnet 3 is arranged around the outer layer of the stator 2, can rotate relative to the stator 2, the rotor shell 4 is arranged in the outer layer of the permanent magnet 3, and is fixedly connected with the permanent magnet 3, so as to rotate synchronously with the permanent magnet 3.
[0024] In the embodiment, the motor shaft 1 is directly arranged in the shaft hole of the stator 2, which is the output shaft of the whole motor. Meanwhile, the first end and the second end of the rotor shell 4 are both provided with a through hole, and the first end and the second end of the motor shaft 1 are respectively arranged out of (or flush with) the corresponding through hole. In addition, the first end and the second end of the rotor shell 4 are both provided with a bearing groove 6, the groove opening of the bearing groove 6 is outward, that is, the bearing groove 6 is open, and the bearing 5 is arranged in the corresponding bearing groove 6, the bearing outer ring is fixedly connected with the bearing groove 6, and the bearing inner ring is fixedly connected with the first end or the second end of the motor shaft 1, so as to rotationally support the two ends of the motor shaft 1.
[0025] It can be understood that in the stationary coordinate system, the motor shaft 1 needs to rotate to output the rotating speed and the torque, and the arrangement of the bearing 5 makes the motor shaft 1 not rotate synchronously with the rotor shell 4 when the rotor shell 4 rotates after the stator 2 is energized. Based on this, in the embodiment, the rotor shell 4 is fixed in the stationary coordinate system, so that the stator 2 rotates relative to the permanent magnet 3 and the rotor shell 4 after being energized. Meanwhile, the motor shaft 1 is fixedly connected with the stator 2 to rotate synchronously with the stator 2, so as to output the rotating speed and the torque outward.
[0026] Therefore, in the embodiment, the external arrangement of the bearings 5 at the two ends of the motor shaft 1 enables the heat generated by the bearings 5 to be dissipated outward in time, so as to avoid the problem of abnormal sound caused by high temperature and the like, and ensure the stable and high-performance output of the motor.
[0027] When the structure provided in the embodiment is adopted, since the stator 2 rotates relative to the stationary coordinate system, the connecting line 7 also rotates. Based on this, in the embodiment, the motor shaft 1 is also provided with a wire hole, the connecting line 7 of the stator 2 enters the inside of the motor shaft 1 from the wire hole, then passes out of the end of the motor shaft 1, and then is electrically connected with the corresponding circuit board or other electronic components. It can be understood that the connecting line 7 located in the inside of the motor shaft 1 also rotates, so that the electrical connection can be maintained in the process of infinite rotation through an electric slip ring or the like.
[0028] The arrangement also enables the circuit board in the motor to be no longer arranged, and simplifies the installation process of the circuit board.
[0029] As a preferred embodiment, the plurality of fixed connections described above in the embodiment are all in the form of interference fit, so as to reduce the opening and the processing and assembling difficulty, including the interference fit between the rotor shell 4 and the permanent magnet 3, the interference fit between the bearing outer ring and the bearing groove 6, the interference fit between the bearing inner ring and the first end or the second end of the motor shaft 1, the interference fit between the stator 2 and the motor shaft 1, and the like. Of course, the stator 2 and the motor shaft 1 can also adopt a shaft key to keep synchronous rotation.
[0030] Meanwhile, as shown in FIG. 4, the first end of the motor shaft 1 is provided with a first bearing 5, and the second end of the motor shaft 1 is provided with a second bearing 5. Figure 3As shown, as a preferred embodiment, the rotor housing 4 of the present embodiment is spliced by two half housings along the direction of the motor shaft 1. Among them, the splicing part is respectively provided with a buckle 8 and a clamping groove 9, the buckle 8 is inserted into the clamping groove 9 to realize the assembly of the rotor housing 4. This installation method is convenient for the installation of the relatively closed structure of the motor in the present embodiment, and the half housing is convenient to manufacture, and the frame working hours can be realized by integral stretching forming. It can be understood that in actual installation, the motor is connected with the corresponding installation structure through the rotor housing 4, so as to ensure the stable output of the motor shaft 1.
[0031] In summary, the bearing external rapid heat dissipation type outer rotor motor provided by the present embodiment is provided. Through the setting of the bearing groove 6 at both ends of the rotor housing 4, the bearing 5 supporting the motor shaft 1 is located outside the rotor housing 4, which can more quickly transfer heat with the external environment, so that the heat generated by the bearing 5 can be dissipated outward in time, and the problem of abnormal sound caused by high temperature will not occur, which ensures the stable and high performance output of the motor, and ensures the stable and quiet rotation of the motor shaft 1. In addition, the processing and manufacturing are relatively simple, and the assembly efficiency is high.
[0032] The technical features of the above embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, but as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.
[0033] The above embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.
Claims
1. A bearing-outside quick heat-dissipation type outer rotor motor, characterized in that, The motor shaft, the stator, the permanent magnet, the rotor shell, the bearing, the stator is arranged in the inner layer, the permanent magnet is arranged around the outer layer of the stator, the rotor shell is arranged in the outer layer of the permanent magnet, and is fixedly connected with the permanent magnet, the motor shaft is arranged in the shaft hole of the stator, the end of the rotor shell is provided with a through hole, the end of the motor shaft is arranged in the through hole, the end of the rotor shell is provided with a bearing groove, the bearing groove is arranged in an open manner, the bearing is arranged in the bearing groove, the bearing outer ring is fixedly connected with the bearing groove, and the bearing inner ring is fixedly connected with the motor shaft, in the stationary coordinate system, the rotor shell is fixedly arranged, the stator rotates relative to the permanent magnet and the rotor shell after being energized, and the motor shaft rotates synchronously with the stator.
2. A bearing external quick heat dissipation type external rotor motor according to claim 1, characterized in that, The first end and the second end of the rotor shell are provided with the through hole, and the first end and the second end of the rotor shell are provided with the bearing groove.
3. A bearing external quick heat dissipation type external rotor motor according to claim 1, characterized in that, The motor shaft is also provided with a wire hole, and the connecting wire of the stator enters the inside of the motor shaft from the wire hole and then passes out from the end of the motor shaft.
4. A bearing external quick heat dissipation type external rotor motor according to claim 1, characterized in that, The rotor shell and the permanent magnet are in interference fit.
5. A bearing external quick heat dissipation type external rotor motor according to claim 1, characterized in that, The bearing outer ring of the bearing and the bearing groove are in interference fit, and the bearing inner ring and the first end or the second end of the motor shaft are in interference fit.
6. A bearing external quick heat dissipation type external rotor motor according to claim 1, characterized in that, The stator and the motor shaft are in interference fit or synchronous rotation through the shaft key.
7. A bearing external quick heat dissipation type external rotor motor according to claim 1, characterized in that, The rotor shell is composed of two half shells along the direction of the motor shaft.
8. A bearing external quick heat dissipation type external rotor motor according to claim 7, characterized in that, The joint of the two half shells is respectively provided with a buckle and a clamping groove, the buckle is inserted into the clamping groove to realize the assembly of the rotor shell.