Planetary gear outer rotor brushless motor

Abstract

The utility model discloses a planetary gear outer rotor brushless motor, which comprises a rotor structure, a stator structure, a support, a lantern ring, a planetary gear box, an input shaft, an output shaft and a lead, the stator structure is installed on the support, the lantern ring is sleeved on the support and connected with the planetary gear box, the input shaft is rotatably installed on the support, and the output shaft is rotatably installed on the support. The stator structure is connected with the output shaft and fixedly connected with the rotor structure, the rotor structure is arranged on the periphery of the stator structure, the input shaft is connected with the planetary gearbox, the output shaft is connected with the planetary gearbox, the lantern ring is provided with a side hole, and the lead is connected with the stator structure and penetrates out of the side hole. In the utility model, the rotor structure is arranged at the periphery of the stator structure, so that the utility model adopts the outer rotor arrangement, the utility model has larger torque and higher efficiency, and the planetary gearbox is arranged, so that the output rotating speed of the utility model can be conveniently adjusted, and the utility model can better meet the use in a low-speed working condition.

Description

Technical Field

[0001] The utility model relates to the field of brushless motor design, in particular to a planetary gear outer rotor brushless motor. Background Art

[0002] Brushless motors, also known as brushless motors, have the advantages of low noise, high energy efficiency and durability compared to brushed motors. They have been widely used in various fields such as home appliances, electronics, and machinery.

[0003] A brushless motor usually includes a rotor and a stator. Most of the brushless motors on the market are inner rotor type. In an inner rotor brushless motor, the rotor is arranged inside the stator. However, the inner rotor brushless motor has a small torque and low efficiency. On the other hand, the output shaft of a common brushless motor rotates at a fast speed. It is difficult to make the shaft speed meet the requirements of some low-speed working conditions by relying solely on voltage adjustment, and the flexibility is poor. Utility Model Content

[0004] The purpose of the utility model is to provide a planetary gear outer rotor brushless motor, which can solve one or more of the above problems.

[0005] According to one aspect of the utility model, a planetary gear outer rotor brushless motor is provided, comprising a rotor structure, a stator structure, a bracket, a collar, a planetary gear box, an input shaft, an output shaft and a lead, wherein the stator structure is mounted on the bracket, the collar is sleeved on the bracket and connected to the planetary gear box, the input shaft is rotatably mounted on the bracket and fixedly connected to the rotor structure, the rotor structure is arranged at the periphery of the stator structure, the input shaft is connected to the planetary gear box, the output shaft is connected to the planetary gear box, the collar is provided with a side hole, the lead is connected to the stator structure and passes through the side hole.

[0006] The beneficial effects of the utility model are as follows: in the utility model, the rotor structure is arranged outside the stator structure, so that the utility model adopts an outer rotor arrangement, which has greater torque and higher efficiency than the inner rotor arrangement, and the utility model is correspondingly provided with a planetary gearbox, which can conveniently adjust the output speed of the utility model, so that the utility model can better meet the use of low-speed working conditions, and has strong flexibility. In addition, the utility model is also provided with a collar, which can separate the position of the rotor structure and the planetary gearbox to a certain extent, avoiding damage to the planetary gearbox caused by the rotor structure during operation, and the collar can leave a certain space for the lead wire to be set, which is convenient for the arrangement of the wire.

[0007] In some embodiments, the rotor structure includes a rotor, a permanent magnet and a retaining frame, wherein the retaining frame is embedded in the rotor, and there are multiple permanent magnets, each of which is fixed on the retaining frame and arranged on the periphery of the stator structure.

[0008] 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 bracket.

[0009] In some embodiments, the utility model further comprises a first bearing and a second bearing, the bracket 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 sleeved on the input shaft. The arrangement of the first bearing and the second bearing can facilitate the rotation of the input shaft on the bracket.

[0010] In some embodiments, the planetary gearbox includes a housing, a first side cover, a second side cover and a planetary gear set, wherein the first side cover is connected to one side of the housing, the second side cover is connected to the other side of the housing, and there are multiple planetary gear sets, which are all disposed in the housing and connected to each other.

[0011] In some embodiments, the planetary gear set includes a center wheel, planetary wheels and a planet carrier, the housing is provided with a ring gear, 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.

[0012] In some embodiments, the utility model further includes a third bearing and a fourth bearing, the second side cover is provided with a through hole, the third bearing and the fourth bearing are both embedded in the through hole, and the third bearing and the fourth bearing are both sleeved on the output shaft. The arrangement of the third bearing and the fourth bearing can facilitate the rotation arrangement of the output shaft on the second side cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of a planetary gear outer rotor brushless motor according to an embodiment of the present utility model.

[0014] Figure 2 It is a cross-sectional view of a structural schematic diagram of a planetary gear outer rotor brushless motor according to an embodiment of the present utility model.

[0015] Figure 3 It is a schematic structural diagram of a planetary gear set of a planetary gear outer rotor brushless motor according to an embodiment of the present invention.

[0016] In the figure: 1. rotor structure, 2. stator structure, 3. bracket, 4. collar, 5. planetary gearbox, 6. input shaft, 7. output shaft, 8. lead, 9. first bearing, 10. second bearing, 20. third bearing, 30. fourth bearing, 11. rotor, 12. permanent magnet, 13. retaining frame, 21. core, 22. winding, 31. cavity, 41. side hole, 51. housing, 52. first side cover, 53. second side cover, 54. planetary gear set, 541. center wheel, 542. planetary wheel, 543. planetary carrier, 511. ring gear, 531. through hole. DETAILED DESCRIPTION

[0017] The structural principle and working principle of the utility model are further described in detail below with reference to the accompanying drawings.

[0018] refer to Figure 1 , Figure 2 and Figure 3 The utility model discloses a planetary gear outer rotor brushless motor, comprising a rotor structure 1, a stator structure 2, a bracket 3, a collar 4, a planetary gear box 5, an input shaft 6, an output shaft 7 and a lead 8.

[0019] The stator structure 2 includes an iron core 21 and a winding 22. The winding 22 is fixedly wound on the iron core 21, and the iron core 21 is fixedly sleeved on the bracket 3, so that the stator structure 2 is fixedly mounted on the bracket 3.

[0020] The ring 4 is integrally formed and sleeved on the bracket 3. A side hole 41 is provided on the ring 4. The lead 8 is connected and electrically connected to the winding 22, and the lead 8 can pass through the side hole 41. The lead 8 can be electrically connected to the external circuit, so that the winding 22 is connected to the external circuit.

[0021] The rotor structure 1 includes a rotor 11, a permanent magnet 12 and a retainer 13. There can be multiple permanent magnets 12, all of which are fixedly embedded in the retainer 13, and the retainer 13 is fixedly embedded in the rotor 11. The rotor 11 and one end of the input shaft 6 are fixedly connected by threaded fitting, so that the input shaft 6 can rotate together with the rotation of the rotor 11.

[0022] The planetary gear outer rotor brushless motor of the utility model further includes a first bearing 9 and a second bearing 10. A cavity 31 is provided in the bracket 3, and the first bearing 9 and the second bearing 10 are both embedded in the cavity 31, and the first bearing 9 and the second bearing 10 are both sleeved on the input shaft 6, so that the input shaft 6 can rotate on the bracket 3.

[0023] After the arrangement, the permanent magnets 12 of the rotor structure 1 will be located outside the winding 22 of the stator structure 2 , and the rotor 11 can be rotatably located on one side of the collar 4 .

[0024] The planetary gearbox 5 includes a housing 51, a first side cover 52, a second side cover 53 and a planetary gear set 54. The first side cover 52 is fixedly connected to one side of the housing 51 by bolts, and the second side cover 53 is fixedly connected to the other side of the housing 51 by bolts. The first side cover 52 and the collar 4 are fixedly connected by bolts, and the first side cover 52 can be arranged on the opposite side of the rotor 11 to the collar 4, so that the collar 4 can separate the rotor 11 and the first side cover 52 to a certain extent.

[0025] There can be several planetary gear sets 54, and the number can be set according to the number of times of deceleration required. In this embodiment, there are preferably two planetary gear sets 54, and the two planetary gear sets 54 are both arranged in the housing 51 and the two are connected.

[0026] Specifically, the planetary gear set 54 includes a central gear 541, planetary gears 542 and a planet carrier 543. A ring gear 511 is provided in the housing 51, and there can be multiple planetary gears 542. In this embodiment, in each planetary gear set 54, there are preferably three planetary gears 542, and the three planetary gears 542 are all meshed with the central gear 541, and the planetary gears 542 are meshed with the ring gear 511. The planet carrier 543 is connected to each planetary gear 542, and the planet carrier 543 can rotate with the rotation of the planetary gears 542.

[0027] The first side cover 52 is provided with a hole, one end of the input shaft 6 passes through the hole and is connected to the center wheel 541 of a planetary gear set 54, so that the rotation of the input shaft 6 can drive the center wheel 541 to rotate, and the planet carrier 543 of the planetary gear set 54 is connected to the center wheel 541 of another planetary gear set 54, and the planet carrier 543 of the other planetary gear set 54 is fixedly connected to the output shaft 7, so that the output shaft 7 serves as the output shaft.

[0028] The planetary gear outer rotor brushless motor of the utility model further includes a third bearing 20 and a fourth bearing 30. The second side cover 53 is provided with a through hole 531, the output shaft 7 extends from the through hole 531, and the third bearing 20 and the fourth bearing 30 are both embedded in the through hole 531, and the third bearing 20 and the fourth bearing 30 are both sleeved on the output shaft 7, so that the output shaft 7 can be rotatably arranged on the through hole 531.

[0029] When the planetary gear outer rotor brushless motor of the utility model is in use, the lead 8 can be electrically connected to the external circuit, so that the winding 22 can be connected to the external circuit through the lead 8, and the winding 22 can be energized to generate an electromagnetic field. Under the action of the electromagnetic field, the permanent magnet 12 can move accordingly, driving the rotor 11 to rotate, and the input shaft 6 connected to the rotor 11 can rotate accordingly.

[0030] The rotation of the input shaft 6 can drive the rotation of the center wheel 541 of the planetary gear set 54 connected thereto, and in the planetary gear set 54, the rotation of the center wheel 541 can correspondingly cause the planetary wheel 542 to rotate, thereby rotating the planetary carrier 543, thereby realizing the first reduction output of the input of the input shaft 6.

[0031] The rotation of the planet carrier 543 can correspondingly drive the rotation of the center wheel 541 of another planetary gear set 54. Similarly, in the planetary gear set 54, the rotation of the center wheel 541 can correspondingly cause the planetary wheel 542 to rotate, thereby rotating the planet carrier 543. The rotation of the planet carrier 543 can cause the output shaft 7 to rotate to achieve output, and at this time, the second deceleration output can be achieved.

[0032] In the present invention, the rotor structure 1 is arranged outside the stator structure 2, so that the present invention adopts an outer rotor arrangement. Compared with the inner rotor arrangement, the outer rotor arrangement can facilitate the present invention to have a larger torque and higher efficiency.

[0033] In addition, a planetary gearbox 5 is correspondingly provided in the utility model, which can conveniently adjust the output speed of the utility model, so that the utility model can better meet the use of low-speed working conditions and has strong flexibility.

[0034] 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 outer rotor brushless motor, characterized in that: It includes a rotor structure, a stator structure, a bracket, a collar, a planetary gearbox, an input shaft, an output shaft and a lead wire, wherein the stator structure is mounted on the bracket, the collar is sleeved on the bracket and connected to the planetary gearbox, the input shaft is rotatably mounted on the bracket and fixedly connected to the rotor structure, the rotor structure is arranged at the periphery of the stator structure, the input shaft is connected to the planetary gearbox, the output shaft is connected to the planetary gearbox, the collar is provided with a side hole, the lead wire is connected to the stator structure and passes through the side hole.

2. The planetary gear outer rotor brushless motor according to claim 1, characterized in that: The rotor structure comprises a rotor, a permanent magnet and a retaining frame, wherein the retaining frame is embedded in the 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 outer rotor brushless 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 bracket.

4. The planetary gear outer rotor brushless motor according to claim 1, characterized in that: The bracket comprises a first bearing and a second bearing. The bracket 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 input shaft.

5. The planetary gear outer rotor brushless motor according to claim 1, characterized in that: The planetary gearbox includes a box body, a first side cover, a second side cover and a planetary gear set. The first side cover is connected to one side of the box body, and the second side cover is connected to the other side of the box body. There are several planetary gear sets, and the several planetary gear sets are all arranged in the box body and connected.

6. The planetary gear outer rotor brushless motor according to claim 5, characterized in that: The planetary gear set includes a central wheel, planetary wheels and a planet carrier. A ring gear is arranged in the housing. The planetary wheels are meshed with the central wheel, the planetary wheels are meshed with the ring gear, and the planet carrier is connected with the planetary wheels.

7. The planetary gear outer rotor brushless motor according to claim 5, characterized in that: It comprises a third bearing and a fourth bearing, the second side cover is provided with a through hole, the third bearing and the fourth bearing are both embedded in the through hole, and the third bearing and the fourth bearing are both sleeved on the output shaft.

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