A double-sided dynamic balance weight-increasing laser radar outer rotor motor and laser radar

Abstract

This invention discloses a dual-sided dynamic balance weight-increasing lidar external rotor motor and lidar. The external rotor motor includes a motor shaft with a bearing mounted on it; a rotor yoke is disposed on the outer ring of the bearing, and the rotor yoke has a first end and a second end axially opposite each other. A plurality of circumferentially distributed second counterweight holes are formed on the end face of the second end; a pressure plate is sleeved on the outer periphery of the first end of the rotor yoke, suitable for pressing an optical reflector onto the rotor yoke. A plurality of circumferentially distributed first counterweight holes are formed on the end face of the pressure plate away from the rotor yoke; counterweights may be provided in parts or all of the first and second counterweight holes. By opening counterweight holes in the rotor yoke and the pressure plate respectively, that is, by opening counterweight holes in the structure at both ends of the motor, and by setting counterweights in the counterweight holes, dual-sided weight-increasing dynamic balance is achieved. The structure is simple, and adjustment is easier and more convenient.

Description

Technical Field

[0001] This invention relates to the field of lidar technology, and more specifically to a dual-sided dynamic balance weight-increasing lidar external rotor motor and a lidar having the external rotor motor. Background Technology

[0002] Laser radar (LiDAR) is a radar system that uses laser beams to detect the position, velocity, and other characteristics of a target. Its working principle involves emitting a detection signal (laser beam) towards the target, then comparing the received signal reflected back from the target (target echo) with the emitted signal. After appropriate processing, information about the target can be obtained, such as its distance, azimuth, altitude, velocity, attitude, and even shape, thereby enabling target detection, tracking, and identification.

[0003] A lidar mainly consists of a housing, a motor, and an optical reflector. The motor is usually an external rotor motor, which mainly includes a motor shaft, a stator assembly fixedly mounted on the shaft, a rotor assembly rotatably mounted on the shaft, and a base housing fixedly mounted at both ends of the shaft. The rotor assembly includes bearings mounted on the shaft and a rotor housing or rotor yoke mounted outside the bearings, while the optical reflector is mounted on the outer periphery of the rotor assembly.

[0004] The rotation of the optical reflector in a lidar system is typically driven by a motor, meaning the optical reflector is part of the motor's external rotor. As is well known, to reduce motor vibration and noise and ensure product reliability, dynamic balancing of the motor rotor is necessary. Currently, conventional dynamic balancing methods include weight addition and weight removal. Weight removal usually involves mechanical drilling or milling, while weight addition typically involves installing dynamic balancing fixtures on the motor or balancing plates at the ends. However, due to the compact structure of lidar motors and weight limitations, dynamic balancing using weight addition fixtures or balancing plates is difficult or extremely challenging to adjust. Summary of the Invention

[0005] To address the aforementioned technical problems, the purpose of this invention is to provide a dual-sided dynamic balance weight-increasing lidar external rotor motor and lidar, which reduces the difficulty of weight-increasing balancing of the lidar motor and solves the problem that existing lidars, limited by their compact structure, are difficult to adjust or have high adjustment difficulty when using existing weight-increasing adjustment methods that involve adding dynamic balancing aids or balancing plates.

[0006] The technical solution of this invention is:

[0007] One objective of this invention is to provide a dual-sided dynamically balanced weight-increasing lidar external rotor motor, comprising:

[0008] The motor shaft is fitted with a bearing.

[0009] A rotor yoke is disposed on the outer ring of the bearing. The rotor yoke has a first end and a second end that are axially opposite each other. A plurality of second counterweight holes are circumferentially distributed on the end face of the second end.

[0010] A pressure plate is sleeved on the outer periphery of the first end of the rotor yoke, which is suitable for pressing the optical mirror onto the rotor yoke. The end face of the pressure plate away from the second end of the rotor yoke has a plurality of circumferentially distributed first counterweight holes.

[0011] Counterweights may be provided in part or all of the first counterweight hole and the second counterweight hole.

[0012] Optionally, the first counterweight hole and the second counterweight hole are threaded holes, and the counterweight is a screw.

[0013] Optionally, the counterweight is fixed in the first counterweight hole and the second counterweight hole by adhesive.

[0014] Optionally, the first counterweight hole and the second counterweight hole are blind holes.

[0015] Optionally, the outer peripheral wall of the rotor yoke is provided with a first stepped surface and a second stepped surface in the direction from the first end to the second end, and the optical reflector is sleeved on the outer periphery of the rotor yoke and overlaps on the second stepped surface;

[0016] The pressure plate has a third step surface and a fourth step surface radially from the inside to the outside on its axial inner end face. The third step surface is directly opposite to the first step surface, and the fourth step surface presses against the optical reflector.

[0017] Optionally, a buffer is provided between the fourth step surface and the optical mirror.

[0018] Optionally, the fourth step surface is provided with a wavy pattern.

[0019] Optionally, it also includes an upper shell and a lower shell, wherein the upper shell is fixed to one end of the motor shaft by screws, and the lower shell is interference-fitted to the other end of the motor shaft.

[0020] Another object of the present invention is to provide a lidar, including an optical reflector and a dual-sided dynamic balance weight-increasing lidar external rotor motor as described in any of the above claims, wherein the optical reflector is sleeved on the outer periphery of the rotor yoke and is pressed and fixed by the pressure plate.

[0021] Compared with the prior art, the advantages of the present invention are:

[0022] The dual-sided dynamic balancing weight-increasing lidar external rotor motor of the present invention achieves weight-increasing dynamic balance by opening counterweight holes in the rotor yoke and pressure plate, that is, by opening counterweight holes in the structure at both ends of the motor. Counterweights are placed in these counterweight holes to achieve weight-increasing dynamic balance on both sides. The structure is simple, and adjustment is easier and more convenient. This solves the problem of difficulty in dynamic balance adjustment due to the compact structure of lidar systems, which rely on adding dynamic balancing aids or balance plates in existing structures. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0024] Figure 1 This is a cross-sectional structural schematic diagram of the external rotor motor of the dual-sided dynamic balance weight-increasing lidar according to an embodiment of the present invention;

[0025] Figure 2 for Figure 1 A top view of the external rotor motor of a dual-sided dynamic balance weight-increasing lidar (top shell omitted).

[0026] Figure 3 This is a bottom view of the external rotor motor of the dual-sided dynamic balance weight-increasing lidar according to an embodiment of the present invention (bottom shell omitted).

[0027] Figure 4 This is a schematic diagram of the pressure plate of the external rotor motor of the dual-sided dynamic balance weight-increasing lidar according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the rotor yoke of the external rotor motor for a dual-sided dynamically balanced weight-increasing lidar according to an embodiment of the present invention.

[0029] The components are: 1. Motor shaft; 2. Bearing; 3. Pressure plate; 31. First counterweight hole; 32. Third step surface; 33. Fourth step surface; 4. Rotor yoke; 41. Second counterweight hole; 42. First step surface; 43. Second step surface; 5. Upper shell; 6. Bottom shell; 7. Optical reflector. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0031] Example:

[0032] See Figures 1 to 5As shown, this embodiment of a dual-sided dynamically balanced weight-adding lidar external rotor motor includes a motor shaft 1, bearings 2, rotor yoke 4, pressure plate 3, stator assembly, rotor magnets, upper shell 5, and bottom shell 6. Two bearings 2 are mounted on the motor shaft 1. The rotor yoke 4 is mounted on the outer ring of the bearings 2, and the outer wall of the rotor yoke 4 is stepped. The rotor yoke 4 has an axially opposite first end, i.e., as shown... Figure 1 The upper end and the second end shown are also as follows Figure 1 The lower end is shown. The stator assembly is sleeved on the motor shaft 1 and located at the second end of the motor shaft 1 near the rotor yoke 4. The inner wall of the second end of the rotor yoke 4 is provided with rotor magnets opposite to the stator assembly. The pressure plate 3 is sleeved on the outer periphery of the first end of the rotor yoke 4 and presses against the optical reflector 7 that is fitted on the outer periphery of the rotor yoke 4. The upper shell 5 is fixed to the first end of the motor shaft 1 near the rotor yoke 4 by screws, and the bottom shell 6 is fixed to one end of the motor shaft 1 near the second end of the rotor yoke 4 by an interference fit. Several second counterweight holes 41 are circumferentially distributed on the end face of the second end of the rotor yoke 4. The end face of the pressure plate 3 away from the second end of the rotor yoke 4 is also shown. Figure 1 The upper surface of the pressure plate 3 shown has several circumferentially distributed first counterweight holes 31. The first counterweight holes 31 and the second counterweight holes 41 can optionally contain some or all counterweights. This solves the problem in existing structures where adding dynamic balancing aids or balance plates is difficult due to the compact structure of the lidar, leading to challenges in dynamic balancing. This invention directly achieves dynamic balancing by opening counterweight holes on the rotor yoke 4 and the pressure plate 3, i.e., by opening counterweight holes within the structures at both ends of the motor, and by placing counterweights in these holes to achieve double-sided weight increase. The structure is simple, and adjustment is easier and more convenient.

[0033] According to some preferred embodiments of the present invention, such as Figures 1 to 3 As shown, both the first counterweight hole 31 and the second counterweight hole 41 are blind holes. In one optional embodiment, the first counterweight hole 31 and the second counterweight hole 41 are threaded holes, and the counterweight is a screw. Weight gain is achieved through a threaded connection to balance the motor, which is simple and convenient. Alternatively, the inner walls of the first counterweight hole 31 and the second counterweight hole 41 can be smooth. Correspondingly, the counterweight is a cylindrical counterweight block, such as a copper counterweight pellet, that matches the counterweight hole and is fixed in the counterweight hole with glue to achieve weight gain and balance the motor. As an alternative embodiment, the first counterweight hole 31 and the second counterweight hole 41 can also be through holes instead of blind holes.

[0034] The first counterweight hole 31 and the second counterweight hole 41 can be processed by laser ablation or by conventional mechanical drilling or milling. Specific details are not described or limited, and those skilled in the art can choose according to actual needs. The diameter and number of the first counterweight hole 31 and the second counterweight hole 41 are not particularly limited, but are determined based on the thickness of the second end of the rotor yoke 4 and the rear end of the upper surface of the pressure plate 3. In this embodiment, the diameter of the circle formed by the first counterweight holes 31 on the pressure plate 3 is larger than the diameter of the circle formed by the second counterweight holes 41 at the second end of the rotor yoke 4, and the number of first counterweight holes 31 is also greater than the number of second counterweight holes 41.

[0035] Regarding the structure of rotor yoke 4, such as Figure 1 and Figure 5 As shown, the outer peripheral wall of the rotor yoke 4, from the first end to the second end, is as follows: Figure 1 The diagram shows a first stepped surface 42 and a second stepped surface 43 arranged from top to bottom. An optical reflector 7 is fitted around the outer periphery of the rotor yoke 4 and overlaps the second stepped surface 43. For example... Figure 1 and Figure 4 As shown, the axial inner end face of the pressure plate 3 is also as shown... Figure 1 The pressure plate 3 shown has a third step surface 32 and a fourth step surface 33 radially arranged from the inside to the outside on its lower end surface. The third step surface 32 is directly opposite the first step surface 42, and the fourth step surface 33 presses against the optical reflector 7. Preferably, a buffer, such as rubber or sponge, is provided between the fourth step surface 33 and the optical reflector 7. More preferably, the surface of the fourth step surface 33 that contacts the buffer has several concentric wavy lines. This increases the compressive force between the pressure plate 3 and the optical reflector 7.

[0036] This invention also provides a lidar, including an optical reflector 7 and a dual-sided dynamically balanced weight-adding lidar external rotor motor as described in the above embodiment. The optical reflector 7 is fixed to the outer periphery of the rotor yoke 4 and pressed and fixed by the pressure plate 3. Because the external rotor motor of the above embodiment is used, it at least has the beneficial effects of the external rotor motor of the above embodiment.

[0037] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A double-sided dynamic balance weight laser radar outer rotor motor, comprising: a motor shaft (1) having a bearing (2) fitted thereon; a rotor yoke (4) provided on the outer ring of the bearing (2), the rotor yoke (4) having axially opposite first and second ends, and a plurality of second counterweight holes (41) being circumferentially distributed on the end face of the second end; a pressing plate (3) fitted on the outer periphery of the first end of the rotor yoke (4) and adapted to press and fix an optical mirror (7) on the rotor yoke (4), the pressing plate (3) having a plurality of first counterweight holes (31) circumferentially distributed on the end face of the second end thereof away from the rotor yoke (4); part or all of the first counterweight holes (31) and the second counterweight holes (41) are provided with counterweight members, wherein the outer peripheral wall of the rotor yoke (4) is provided with a first step surface (42) and a second step surface (43) in the direction from the first end to the second end, and the optical mirror (7) is fitted on the outer periphery of the rotor yoke (4) and overlaps the second step surface (43); the axially inner end face of the pressing plate (3) is radially provided with a third step surface (32) and a fourth step surface (33) from inside to outside, the third step surface (32) is opposite to the first step surface (42), and the fourth step surface (33) is pressed against the optical mirror (7), wherein the position of the third step surface (32) opposite to the first step surface (42) is located on the inner side of the optical mirror (7).

2. The dual-sided dynamic balance weighted ladar outer rotor motor of claim 1, wherein, The first counterweight holes (31) and the second counterweight holes (41) are threaded holes, and the counterweight members are screws.

3. The dual-sided dynamic balance weighted laser radar outer rotor motor of claim 1, wherein, The counterweight members are fixed in the first counterweight holes (31) and the second counterweight holes (41) by glue.

4. The dual-sided dynamic balance weight laser-radar outer rotor motor of claim 1, wherein, The first counterweight holes (31) and the second counterweight holes (41) are blind holes.

5. The dual-sided dynamic balance weighted ladar outer rotor motor of claim 1, wherein, A buffer member is provided between the fourth step surface (33) and the optical mirror (7).

6. The dual-sided dynamic balance weight laser-radar outer rotor motor of claim 1, wherein, The fourth step surface (33) is provided with a wave pattern.

7. The dual-sided dynamic balance weighted ladar outer rotor motor of claim 1, wherein, Further comprising an upper shell (5) and a bottom shell (6), the upper shell (5) is fixed on one end of the motor shaft (1) by screws, and the bottom shell (6) is interference-fitted with the other end of the motor shaft (1).

8. A lidar, comprising: An optical mirror (7) and the double-sided dynamic balance weight laser radar outer rotor motor according to any one of claims 1-7, the optical mirror (7) is fitted on the outer periphery of the rotor yoke (4) and is pressed and fixed by the pressing plate (3).

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