Brushless motor rotor capable of adjusting dynamic balance for mower
The brushless DC motor rotor with adjustable balance weights and locking mechanism addresses the issue of vibration by allowing for precise balance tuning, resulting in reduced vibration and improved stability.
Patent Information
- Application Number
- CN202422140251.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-02
AI Technical Summary
The rotor of the brushless motor for traditional lawn mowers is difficult to adjust during the manufacturing process, resulting in obvious vibrations.
The rotor core is opened through holes and spare holes, and the upper cover and the lower cover are closed. The dynamic balance is adjusted by filling the balance mud, and grooves and grooves are provided on the upper cover and the lower cover for fine adjustment. In combination with the locking pin, the magnetic steel is locked to achieve precise adjustment of dynamic balance.
It improves the dynamic balance performance of the brushless motor rotor, reduces the vibration of the lawn mower, ensures that the balance mud does not fall off, and achieves fine adjustment of dynamic balance.
Smart Images
Figure CN223109804U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of motors, and particularly relates to a brushless motor rotor for a lawn mower with adjustable dynamic balance. Background Art
[0002] The power source of traditional ride-on lawn mower gardening tools is mainly gasoline engines, which generate relatively large noise and seriously disturb residents. With the continuous improvement of users' requirements for product quality, in recent years, permanent magnet direct current brushless motors have been increasingly used in lawn mowers, which can effectively reduce noise and use more environmentally friendly electric energy.
[0003] However, when a conventional brushless motor for a lawn mower is in use, the vibration is still relatively obvious. The main reason is that the unavoidable errors in the manufacturing process of the rotor of the brushless motor result in inconsistent dynamic balance quality, and the dynamic balance of the already manufactured rotor cannot be adjusted in the later stage, ultimately leading to relatively obvious vibration when the brushless motor is applied. Summary of the Utility Model
[0004] The technical problem to be solved by the utility model is to provide a brushless motor rotor for a lawn mower with adjustable dynamic balance, and solve the technical problem that it is difficult to adjust the dynamic balance of the traditional brushless motor rotor.
[0005] To solve the above technical problem, the technical solution adopted by the utility model is: a brushless motor rotor for a lawn mower with adjustable dynamic balance, including a rotating shaft, a rotor core coaxially sleeved on the rotating shaft, and a plurality of magnetic steel pieces connected to the rotor core. A plurality of through holes evenly distributed in the circumferential direction are formed on the rotor core, and the axial directions of the through holes are parallel to the axial direction of the rotor core. Upper and lower covers are respectively connected to both ends of the rotor core, the upper and lower covers are respectively sleeved on the rotating shaft, and the upper and lower covers respectively seal both ends of the through holes on the rotor core.
[0006] As a preferred solution, a plurality of spare holes evenly distributed in the circumferential direction are further formed on the rotor core. The spare holes are located outside the through holes and the diameter of the spare holes is smaller than that of the through holes. The spare holes penetrate through the rotor core, and any one of the spare holes is arranged on the symmetry axis between two adjacent through holes. The upper and lower covers are used to seal both ends of the spare holes.
[0007] As a preferred solution, a plurality of grooves are evenly distributed in the circumferential direction on the opposite surfaces of the upper and lower covers, and the grooves are isolated from each other by radially extending ribs.
[0008] As a preferred solution, one end of the groove far from the rotating shaft is axially recessed along the rotating shaft to form an embedding groove with a depth greater than that of the groove.
[0009] As a preferred solution, a plurality of card slots are circumferentially and evenly distributed on the outer wall of the rotor core, and the magnetic steels are respectively clamped in the card slots. Any two adjacent card slots are isolated from each other by an isolation rib. A locking hole and a through groove are formed in the isolation rib. Both the locking hole and the through groove extend along the axial direction of the isolation rib. The through groove is located outside the locking hole and the through groove communicates with the locking hole. The diameter of the locking hole is larger than the width of the through groove. The through groove forms an opening on the outer wall of the isolation rib. Locking pins are respectively inserted into both ends of the locking hole. The locking pins expand the two ends of the isolation rib outward to squeeze the magnetic steels in the card slots, thereby locking the magnetic steels.
[0010] The beneficial effects of the present utility model are as follows: By providing through holes and spare holes on the rotor core, the present utility model enables balance mud to be added into certain through holes or spare holes during the manufacturing process and after the manufacturing of the rotor, so as to adjust the dynamic balance of the rotor, improve the dynamic balance performance of the brushless motor rotor, and solve the technical problem that it is difficult to adjust the dynamic balance of the traditional brushless motor rotor.
[0011] The present utility model also closes the through holes and spare holes by providing an upper cover and a lower cover, so that the balance mud in the through holes and spare holes does not fall off.
[0012] The present utility model further provides grooves on the upper cover and the lower cover, so that users can further finely adjust the dynamic balance of the brushless motor rotor by adding balance mud into the grooves, and further improve the dynamic balance effect of the rotor.
[0013] The present utility model further provides embedding grooves on the upper cover and the lower cover to improve the connection stability between the balance mud and the upper cover or the lower cover, and prevent the balance mud from falling off during the high-speed rotation of the rotor.
[0014] The present utility model further locks the magnetic steels by using locking pins, and users can change the lengths of certain locking pins according to the needs of adjusting the dynamic balance of the motor rotor, so as to further improve the dynamic balance effect of the rotor. Description of the Drawings
[0015] The following further details the specific embodiments of the present utility model with reference to the drawings, where:
[0016] Figure 1 is the exploded perspective view of the three-dimensional structure of the present utility model;
[0017] Figure 2 is the specific structural schematic diagram of the isolation rib of the present utility model;
[0018] Figure 1 and Figure 2In the figure: 1. Rotating shaft, 2. Rotor core, 3. Permanent magnet, 4. Through hole, 5. Upper cover, 6. Lower cover, 7. Spare hole, 8. Groove, 9. Rib, 10. Embedded groove, 11. Card slot, 12. Isolation rib, 13. Locking hole, 14. Through slot, 15. Lock pin. Specific embodiments
[0019] The following combines with the attached drawings to describe in detail the specific implementation scheme of the present utility model.
[0020] As Figure 1 Shown is a brushless motor rotor for a lawn mower with adjustable dynamic balance, including a rotating shaft 1, a rotor core 2 coaxially sleeved on the rotating shaft 1, and multiple permanent magnets 3 connected to the rotor core 2. A plurality of through holes 4 circumferentially and uniformly distributed are formed on the rotor core 2. The axial directions of the through holes 4 are parallel to the axial direction of the rotor core 2. Upper and lower covers 5 and 6 are respectively connected to both ends of the rotor core 2. The upper and lower covers 5 and 6 are respectively sleeved on the rotating shaft 1, and the upper and lower covers 5 and 6 respectively seal both ends of the through holes 4 on the rotor core 2. The through holes 4 are used to selectively fill balance mud to enable the brushless motor rotor to have higher dynamic balance performance. The upper and lower covers 5 and 6 can well seal the through holes 4, so that the balance mud in the through holes 4 will not fall off when the brushless motor rotor rotates or vibrates.
[0021] As an improvement to the above technical solution, a plurality of through holes 7 circumferentially and uniformly distributed are further formed on the rotor core 2. The spare holes 7 are located outside the through holes 4 and the diameters of the spare holes 7 are smaller than the diameters of the through holes 4. The spare holes 7 penetrate the rotor core 2. Any one of the spare holes 7 is arranged on the axis of symmetry between two adjacent through holes 4. The upper and lower covers 5 and 6 are used to seal both ends of the spare holes 7.
[0022] In addition to further reducing the weight of the rotor core 2, the spare holes 7 can also fill balance mud according to the needs of users to further finely adjust the dynamic balance performance of the brushless motor rotor.
[0023] In this embodiment, preferably, a plurality of grooves 8 are circumferentially and uniformly distributed on the opposite surfaces of the upper and lower covers 5 and 6. Each groove 8 is isolated from each other by a rib 9 extending radially. For the dynamic balance problem that occurs after the brushless motor rotor and the stator are assembled, users can adjust the dynamic balance performance of the rotor by filling balance mud into the grooves 8.
[0024] As Figure 1As shown in the figure, in this embodiment, the end of the groove 8 away from the rotating shaft 1 is axially recessed along the rotating shaft 1 to form an embedding groove 10 with a depth greater than that of the groove 8. The embedding groove 10 has a larger capacity to accommodate more balancing mud, and the embedding groove 10 is farther from the rotation center of the rotor, so the effect of the balancing mud is better. Moreover, the embedding groove 10 with a small area and a large depth also makes a vacuum negative pressure state formed between the balancing mud and the bottom surface of the embedding groove 10 after the inside is filled with the balancing mud, and the embedding groove 10 can reliably adsorb the balancing mud to prevent the balancing mud from falling off.
[0025] Combined Figure 1 with Figure 2 As shown in the figure, in this embodiment, a plurality of clamping grooves 11 are circumferentially and evenly distributed on the outer wall of the rotor core 2, and the magnetic steel 3 is clamped in the clamping grooves 11 one by one. Any two adjacent clamping grooves 11 are isolated from each other by an isolation rib 12. A locking hole 13 and a through groove 14 are formed in the isolation rib 12. Both the locking hole 13 and the through groove 14 extend along the axial direction of the isolation rib 12. The through groove 14 is located outside the locking hole 13 and the through groove 14 communicates with the locking hole 13. The diameter of the locking hole 13 is larger than the width of the through groove 14. The through groove 14 forms an opening on the outer wall of the isolation rib 12. Locking pins 15 are respectively inserted into both ends of the locking hole 13. The locking pins 15 expand the two ends of the isolation rib 12 outward to squeeze the magnetic steel 3 in the clamping groove 11, locking the magnetic steel 3. Users can change the length of some locking pins according to the need for dynamic balance adjustment of the brushless motor rotor to further improve the dynamic balance effect of the rotor.
[0026] The working principle of the present utility model is as follows: The present utility model adjusts the dynamic balance of the brushless motor rotor by setting through holes 4 and spare holes 7 on the rotor core to improve its dynamic balance effect, and further uses the upper cover 5 and the lower cover 6 to seal the through holes 4 and the spare holes 7 to ensure that the balancing mud in the through holes 4 and the spare holes 7 does not fall off. At the same time, the present utility model further sets grooves 8 and embedding grooves 10 on the surfaces of the upper cover 5 and the lower cover 6, and fills the grooves 8 and the embedding grooves 10 with balancing mud to further fine-tune the dynamic balance performance of the brushless motor rotor, further improving the dynamic balance performance of the brushless motor rotor. Finally, the present utility model also provides an opportunity to adjust the length of the locking pins through a special magnetic steel locking structure to adjust the dynamic balance effect of the brushless motor rotor. Therefore, the present utility model can effectively solve the technical problem that it is difficult to adjust the dynamic balance of the traditional brushless motor rotor, greatly improve the dynamic balance performance of the brushless motor rotor, and reduce the vibration of the brushless motor used in the lawn mower.
[0027] The above embodiments only illustratively explain the principle and efficacy of the present invention and some applied embodiments, rather than limiting the present invention; it should be pointed out that for those of ordinary skill in the art, without departing from the inventive concept of the present invention, several deformations and improvements can be made, and these all belong to the protection scope of the present invention.
Claims
1. A brushless motor rotor for a lawn mower with adjustable dynamic balance, comprising a rotating shaft (1), a rotor core (2) coaxially sleeved on the rotating shaft (1), and a plurality of magnetic steel sheets (3) connected to the rotor core (2), characterized in that, A plurality of through holes (4) which are circumferentially and uniformly distributed are formed in the rotor core (2), the axial directions of the through holes (4) are parallel to the axial direction of the rotor core (2), upper covers (5) and lower covers (6) are respectively connected to two ends of the rotor core (2), the upper covers (5) and the lower covers (6) are respectively sleeved on a rotating shaft (1), and the upper covers (5) and the lower covers (6) respectively seal two ends of the through holes (4) in the rotor core (2).
2. The brushless motor rotor for a lawn mower with adjustable dynamic balance according to claim 1, characterized in that, A plurality of spare holes (7) which are circumferentially and uniformly distributed are further formed in the rotor core (2), the spare holes (7) are located on the periphery of the through holes (4) and the diameters of the spare holes (7) are smaller than the diameters of the through holes (4), the spare holes (7) penetrate through the rotor core (2), any one of the spare holes (7) is arranged on the symmetry axis between two adjacent through holes (4), and the upper covers (5) and the lower covers (6) are used for closing two ends of the spare holes (7).
3. The brushless motor rotor for a lawn mower with adjustable dynamic balance according to claim 1, wherein, A plurality of grooves (8) which are circumferentially and uniformly distributed are formed on the opposite surfaces of the upper covers (5) and the lower covers (6), and the grooves (8) are isolated from each other by radially extending rib strips (9).
4. The brushless motor rotor for a lawn mower with adjustable dynamic balance according to claim 3, characterized in that, One end of the groove (8) far away from the rotating shaft (1) is recessed axially along the rotating shaft (1) to form an embedding groove (10) with a depth greater than that of the groove (8).
5. The brushless motor rotor for a lawn mower with adjustable dynamic balance according to claim 1, characterized in that, A plurality of clamping grooves (11) which are circumferentially and uniformly distributed are formed on the outer wall of the rotor core (2), the magnetic steel (3) is clamped in the clamping grooves (11) one by one, any two adjacent clamping grooves (11) are isolated from each other by an isolation rib (12), a locking hole (13) and a through groove (14) are formed in the isolation rib (12), the locking hole (13) and the through groove (14) both extend axially along the isolation rib (12), the through groove (14) is located outside the locking hole (13) and the through groove (14) is communicated with the locking hole (13), the diameter of the locking hole (13) is larger than the width of the through groove (14), the through groove (14) forms an opening on the outer wall of the isolation rib (12), locking pins (15) are respectively inserted into two ends of the locking hole (13), and the locking pins (15) expand the two ends of the isolation rib (12) outwards to extrude the magnetic steel (3) in the clamping groove (11) to lock the magnetic steel (3).