Planetary gear low-speed motor
Through the design of the planetary low-speed motor, the external rotor mode and the connecting frame are integrated with the gearbox body, the output speed is reduced and the torque is increased, and the problem that existing motors are difficult to achieve low speed and high torque in compact space is solved. Yu Xiao Home Appliances and other products.
Patent Information
- Application Number
- CN202421146359.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-23
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-05-23
AI Technical Summary
The existing motors have a small range when controlling the output shaft speed, making it difficult to achieve effective integration of low speed and high torque in products with large demand for compact space.
The planetary gear low-speed motor design is adopted, and the gearbox body is connected to the stator structure through the outer rotor mode and the connecting frame. The planetary gear set is used to achieve multi-stage reduction, combined with the design of the first and second shafts, and the output speed is reduced and Increased torque.
It realizes a compact motor design, suitable for smaller products such as small appliances, and provides smaller output speeds and larger output torques, meeting space and performance requirements.
Smart Images
Figure CN222356131U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of motor design, in particular to a planetary gear low-speed motor. Background Art
[0002] Motor is the transliteration of motor, which means electric motor or engine. Its working principle is mainly that the energized coil rotates in the magnetic field to drive the rotor to rotate, and the output shaft connected to the rotor can rotate accordingly to output power.
[0003] The speed of the output shaft of a common motor mostly depends on the control of voltage or current. In actual use, whether it is the control of voltage or current, the range of output shaft speed control is relatively small. In order to reduce the final output speed and increase the output torque, a gearbox and other structures are now connected to the motor. However, directly connecting a gearbox to the output shaft of the motor will greatly increase its overall height, require a large space for installation, and have low compactness, which is not conducive to use in some smaller products, such as small household appliances. Utility Model Content
[0004] The purpose of the utility model is to provide a planetary gear low-speed motor, which can solve one or more of the above problems.
[0005] According to one aspect of the utility model, a planetary gear low-speed motor is provided, including an outer rotor structure, a stator structure, a connecting frame, a first shaft, a reduction gear box, a planetary gear set and a second shaft, wherein the connecting frame is embedded in the reduction gear box, the stator structure is mounted on the connecting frame, the first shaft is rotatably mounted on the connecting frame and connected to the outer rotor structure, the planetary gear set is mounted in the reduction gear box, the first shaft is connected to the planetary gear set, and the second shaft is connected to the planetary gear set.
[0006] The beneficial effects of the utility model are as follows: the utility model adopts an outer rotor mode, and connects the reduction box body and the stator structure by setting a connecting frame, so that the reduction box body can be effectively integrated into the utility model, and the output of the first shaft can be decelerated by the planetary gear set and output through the second shaft to obtain a smaller output speed and a larger output torque. Therefore, the utility model is highly compact, requires a small space for setting, and can be used for small-sized products such as small household appliances.
[0007] In some embodiments, the outer rotor structure includes an outer rotor, a permanent magnet and a retaining frame, wherein the retaining frame is embedded in the outer rotor, and the permanent magnet is multiple, and the multiple permanent magnets are all fixed on the retaining frame and arranged on the periphery of the stator structure.
[0008] In some embodiments, the outer rotor is provided with an inner boss, and one end of the first shaft is embedded in the inner boss. The inner boss can increase the contact area between the first shaft and the outer rotor, thereby increasing the contact area between them and improving the connection reliability between them.
[0009] In some embodiments, the stator structure includes an iron core and a winding, the winding is wound on the iron core, and the iron core is sleeved on a connecting frame.
[0010] In some embodiments, the reduction gear box includes a front cover, a box body and a tail cover, wherein the front cover is connected to one side of the box body, and the tail cover is connected to the other side of the box body.
[0011] In some embodiments, the front cover is provided with a through hole, the connecting frame is provided with a connecting portion, the bottom of the connecting frame is provided with an annular extension portion, the extension portion is embedded in the through hole, and the connecting portion is attached to and connected with the front cover. The corresponding arrangement of the through hole and the extension portion can increase the contact area between the front cover and the connecting frame, thereby improving the connection reliability of the connecting frame on the front cover, and can reduce the thickness requirement after the connecting frame and the front cover are connected, thereby reducing the total thickness of the utility model.
[0012] In some embodiments, the planetary gear set includes a plurality of unit planetary gear structures, and the plurality of unit planetary gear structures are connected to each other. By providing a plurality of unit planetary gear structures, it is convenient to realize multi-stage reduction of the output.
[0013] In some embodiments, the unit planetary gear structure includes a center wheel, planetary wheels and a planet carrier, a ring gear is provided in the housing, the planetary wheels are meshed with the center wheel, the planetary wheels are meshed with the ring gear, and the planet carrier is connected to the planetary wheels.
[0014] In some embodiments, the utility model further comprises a first bearing and a second bearing, the connecting frame is provided with a cavity, the first bearing and the second bearing are both embedded in the cavity, and the first bearing and the second bearing are both mounted on the first shaft. The arrangement of the first bearing and the second bearing can facilitate the rotation of the first shaft on the connecting frame. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic structural diagram of a planetary gear low-speed motor according to an embodiment of the present utility model.
[0016] Figure 2 It is a cross-sectional view of a structural schematic diagram of a planetary gear low-speed motor according to an embodiment of the present utility model.
[0017] Figure 3 It is a structural schematic diagram of a connecting frame of a planetary gear low-speed motor according to an embodiment of the present utility model.
[0018] Figure 4 It is a schematic structural diagram of a unit planetary gear structure of a planetary gear low-speed motor according to an embodiment of the present utility model.
[0019] In the figure: 1. outer rotor structure, 2. stator structure, 3. connecting frame, 4. first shaft, 5. reduction box, 6. planetary gear set, 7. second shaft, 8. first bearing, 9. second bearing, 11. outer rotor, 12. permanent magnet, 13. retaining frame, 111. inner boss, 21. iron core, 22. winding, 31. connecting part, 32. extension part, 33. cavity, 51. front cover, 52. box, 53. tail cover, 511. through hole, 521. ring gear, 60. unit planetary gear structure, 61. center wheel, 62. planetary gear, 63. planetary carrier. DETAILED DESCRIPTION
[0020] The structural principle and working principle of the utility model are further described in detail below with reference to the accompanying drawings.
[0021] refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 The utility model discloses a planetary gear low-speed motor, comprising an outer rotor structure 1, a stator structure 2, a connecting frame 3, a first shaft 4, a reduction gear box 5, a planetary gear set 6 and a second shaft 7.
[0022] The reduction box 5 comprises a front cover 51, a box 52 and a tail cover 53. The front cover 51 is connected to one side of the box 52, and the tail cover 53 is fixedly connected to the other side of the box 51 by bolts. A through hole 511 is provided in the middle of the front cover 51.
[0023] A connecting portion 31 is provided on the side of the connecting frame 3, and an annular extending portion 32 is provided on the bottom of the connecting frame 3. The extending portion 32 is embedded in the through hole 511, so that the connecting frame 3 is embedded in the reduction gearbox body 5, and the connecting portion 31 is in contact with the front cover 51, and the connecting portion 31 is fixedly connected to the front cover 51 by bolts, so as to further improve the connection reliability between the connecting frame 3 and the front cover 51.
[0024] The stator structure 2 includes an iron core 21 and a winding 22 . The winding 22 is wound on the iron core 21 , and the iron core 21 is fixedly sleeved on the connecting frame 3 , so that the stator structure 2 is fixedly mounted on the connecting frame 3 .
[0025] A cavity 33 is also provided inside the connecting frame 3, and the planetary gear low-speed motor of the utility model further includes a first bearing 8 and a second bearing 9. The first bearing 8 and the second bearing 9 are both embedded in the cavity 33, and the first bearing 8 and the second bearing 9 are both sleeved on the first shaft 4, so that the first shaft 4 is rotatably mounted on the connecting frame 3.
[0026] The outer rotor structure 1 includes an outer rotor 11, a permanent magnet 12 and a retainer 13. The retainer 13 is fixedly embedded in the outer rotor 11. There can be multiple permanent magnets 12, and multiple permanent magnets 12 are fixedly embedded in the retainer 13. An inner boss 111 is provided in the middle of the outer rotor 11, and one end of the first shaft 4 is fixedly embedded in the inner boss 111, so that the first shaft 4 is fixedly connected to the outer rotor 11, and the rotation of the outer rotor 11 can drive the first shaft 4 to rotate. The outer rotor 11 is arranged at the periphery of the stator structure 2.
[0027] The planetary gear set 6 includes a unit planetary gear structure 60 . There can be several unit planetary gear structures 60 . In the present embodiment, there are preferably two unit planetary gear structures 60 , and the two unit planetary gear structures 60 are connected in sequence.
[0028] Specifically, the unit planetary gear structure 60 includes a central wheel 61, planetary wheels 62 and a planet carrier 63. A ring gear 521 is provided in the housing 52 of the reduction gear box 5. There can be multiple planetary wheels 62. In this embodiment, there are preferably three planetary wheels 62. The three planetary wheels 62 are all meshed with the central wheel 61, and the planetary wheels 62 are meshed with the ring gear 521. The planet carrier 63 is connected to each planetary wheel 62, and the planet carrier 63 can rotate with the rotation of the planetary wheels 62.
[0029] After one end of the first shaft 4 passes through the through hole 511, it is connected to the center wheel 61 of a unit planetary gear structure 60, so that the rotation of the first shaft 4 can drive the center wheel 61 to rotate, and the planet carrier 63 of the unit planetary gear structure 60 is connected to the center wheel 61 of another unit planetary gear structure 60, and the planet carrier 63 of the other unit planetary gear 60 is fixedly connected to the second shaft 7, so that the second shaft 7 serves as an output shaft.
[0030] When the planetary gear low-speed motor of the present invention is in use, the winding 22 of the stator structure 2 can be electrically connected to an external circuit, so that the winding 22 can be energized to generate an electromagnetic field, which can cause the permanent magnet 12 to rotate. The rotation of the permanent magnet 12 can drive the outer rotor 11 to rotate, and the rotation of the outer rotor 11 can correspondingly cause the first shaft 4 to rotate.
[0031] The rotation of the first shaft 4 can drive the rotation of the center wheel 61 of the unit planetary gear structure 60 connected thereto, and in the unit planetary gear structure 60, the rotation of the center wheel 61 can correspondingly cause the planetary wheel 62 to rotate, thereby causing the planet carrier 63 to rotate accordingly, thereby achieving the first deceleration. Afterwards, the rotation of the planet carrier 63 can correspondingly drive the rotation of the center wheel 61 of another unit planetary gear structure 60, and in the unit planetary gear structure 60, the rotation of the center wheel 61 can correspondingly cause the planetary wheel 62 to rotate, thereby causing the planet carrier 63 to rotate accordingly. Finally, the second shaft 7 connected to the planet carrier 63 can rotate to achieve output, thereby achieving the second deceleration.
[0032] The utility model adopts an outer rotor mode, and connects the reduction box body 5 and the stator structure 2 by setting a connecting frame 3, so that the reduction box body 6 can be effectively integrated in the utility model, and the output of the first shaft 4 can be output from the second shaft 7 after two decelerations to obtain a smaller output speed and a larger output torque, and the flexibility is strong. Therefore, the utility model is compact, requires a small space for setting, and can be used for small-sized products such as small household appliances.
[0033] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.
Claims
1. Planetary gear low speed motor, characterized in that: It includes an outer rotor structure, a stator structure, a connecting frame, a first shaft, a reduction gear box, a planetary gear set and a second shaft. The connecting frame is embedded in the reduction gear box, the stator structure is mounted on the connecting frame, the first shaft is rotatably mounted on the connecting frame and connected to the outer rotor structure, the planetary gear set is mounted in the reduction gear box, the first shaft is connected to the planetary gear set, and the second shaft is connected to the planetary gear set.
2. The planetary gear low speed motor according to claim 1, characterized in that: The outer rotor structure comprises an outer rotor, a permanent magnet and a retaining frame, wherein the retaining frame is embedded in the outer rotor, and the permanent magnets are multiple, and the multiple permanent magnets are all fixed on the retaining frame and arranged on the periphery of the stator structure.
3. The planetary gear low speed motor according to claim 2, characterized in that: The outer rotor is provided with an inner boss, and one end of the first shaft is embedded in the inner boss.
4. The planetary gear low speed motor according to claim 1, characterized in that: The stator structure comprises an iron core and a winding, wherein the winding is wound on the iron core, and the iron core is sleeved on a connecting frame.
5. The planetary gear low speed motor according to claim 1, characterized in that: The reduction box body comprises a front cover, a box body and a tail cover, wherein the front cover is connected to one side of the box body, and the tail cover is connected to the other side of the box body.
6. The planetary gear low speed motor according to claim 5, characterized in that: The front cover is provided with a through hole, the connecting frame is provided with a connecting portion, the bottom of the connecting frame is provided with an annular extending portion, the extending portion is embedded in the through hole, and the connecting portion is attached to and connected with the front cover.
7. The planetary gear low speed motor according to claim 1, characterized in that: The planetary gear set includes a plurality of unit planetary gear structures, and the plurality of unit planetary gear structures are connected.
8. The planetary gear low speed motor according to claim 7, characterized in that: The unit planetary gear structure comprises a central wheel, planetary wheels and a planet carrier. A gear ring is arranged in the housing. The planetary wheels mesh with the central wheel, the planetary wheels mesh with the gear ring, and the planet carrier is connected with the planetary wheels.
9. The planetary gear low speed motor according to claim 1, characterized in that: It comprises a first bearing and a second bearing. The connecting frame is provided with a cavity. The first bearing and the second bearing are both embedded in the cavity. The first bearing and the second bearing are both sleeved on the first shaft.