Motor, mechanical equipment and traffic equipment

Abstract

The invention discloses a motor, mechanical equipment and traffic equipment, so as to reduce the size of the motor and further facilitate the realization of the miniaturization design of the mechanical equipment. The motor comprises a base, a rotor assembly, a bearing assembly and an encoder assembly, and the base is provided with a mounting hole; the rotor assembly comprises a rotor shell and a rotor shaft, the rotor shaft is fixedly connected with the rotor shell, and all or part of the first end of the rotor shaft extends into the mounting hole; the bearing assembly sleeves the peripheral side of the rotor shaft, and one end of the bearing assembly is fixed in the mounting hole so as to rotatably support the rotor shaft on the base; the encoder assembly comprises a code disc seat, a code disc and a circuit board, the code disc seat is fixedly connected with the first end of the rotor shaft, the code disc is fixed to the code disc seat, the axis of the code disc and the axis of the rotor shaft are coaxially arranged, the circuit board is fixed to the base and provided with an encoder chip, and the encoder chip and the code disc are oppositely arranged in the axial direction of the rotor shaft.

Description

Technical Field

[0001] The present application relates to the field of mechanical equipment, and in particular to a motor, mechanical equipment and transportation equipment. Background Art

[0002] In the field of autonomous driving, vehicle-mounted LiDAR is one of the most critical sensors in autonomous vehicles, and it plays an important role in ensuring the driving safety of autonomous vehicles. In order for LiDAR to detect targets farther away and obtain a better field of view, it is generally installed on the roof of the vehicle. However, since the roof needs to be connected to the front and rear windshields and a roof canopy is usually installed, the available space is relatively limited. At present, the motors configured in LiDAR are often large in size, making it difficult to achieve a miniaturized design of LiDAR. When installed on the roof, it is easy to occupy the area of ​​the windshield and the roof canopy, affecting the overall design of the vehicle. Summary of the invention

[0003] The present application provides a motor, mechanical equipment and transportation equipment to reduce the size of the motor, thereby helping to achieve a miniaturized design of the mechanical equipment.

[0004] In the first aspect, the present application provides a motor, which may include a base, a rotor assembly, a bearing assembly and an encoder assembly. The base may be used to support the rotor assembly, the bearing assembly and the encoder assembly, and the base may be provided with a mounting hole; the rotor assembly may include a rotor housing and a rotor shaft, the rotor shaft is fixedly connected to the rotor housing, and all or part of the first end of the rotor shaft along its axial direction may extend into the mounting hole of the base; the bearing assembly may be sleeved on the circumferential side of the rotor shaft, and one end of the bearing assembly may be fixed to the mounting hole to support the rotor shaft rotationally on the base; the encoder assembly may include a code disc seat, a code disc and a circuit board, the code disc seat is fixedly connected to the first end of the rotor shaft, the code disc is fixed to the code disc seat, and the axis of the code disc is coaxially arranged with the axis of the rotor shaft; the circuit board may be fixed to the base, and an encoder chip is arranged on the circuit board, and the encoder chip and the code disc are arranged relative to each other along the axial direction of the rotor shaft, so that the encoder chip can sense the code disc.

[0005] In the present application, the code disc is fixedly connected to the rotor shaft through a code disc seat, and the axis of the code disc is coaxially arranged with the axis of the rotor shaft, that is, the code disc is located on the axis line of the rotor shaft. Compared with the solution of installing the code disc on the rotor housing in the prior art, the present application can effectively reduce the radial space occupied by the motor, thereby reducing the radial size of the motor, and further helping to achieve the miniaturized design of mechanical equipment using the motor.

[0006] In some embodiments, a countersunk hole may be provided on the end surface of the base facing away from the rotor housing, and the countersunk hole is connected to the mounting hole. A circuit board may be disposed in the countersunk hole. The encoder chip may be located on the side of the circuit board facing the rotor housing, and the encoder chip is exposed in the mounting hole, so that the encoder chip can be disposed relative to the code disk.

[0007] In addition, the side of the circuit board facing away from the rotor housing and the side end surface of the base facing away from the rotor housing may have a height difference, so that other electronic components can be arranged on the side of the circuit board facing away from the rotor housing to increase space utilization on the circuit board.

[0008] In some embodiments, the end of the code disc seat facing the rotor shaft may have a first mounting groove, and the end of the code disc seat facing away from the rotor shaft may have a second mounting groove. The first end of the rotor shaft may be inserted into the first mounting groove, and the code disc may be fixed in the second mounting groove, so that the rotor shaft and the code disc are relatively fixed by the code disc seat.

[0009] Exemplarily, the axis center of the first mounting groove and the axis center of the second mounting groove can be coaxially arranged, so that the first mounting groove can be used to radially position the rotor shaft, and the second mounting groove can be used to radially position the code disc, thereby reducing the difficulty of coaxial installation of the rotor shaft and the code disc.

[0010] In some embodiments, the bearing assembly may include one or more bearings arranged along the axial direction of the rotor shaft, the inner rings of the one or more bearings are respectively fixedly connected to the rotor shaft, and the outer rings of the one or more bearings may be an integral structure. This integral outer ring design can effectively improve the coaxiality of multiple bearings, reduce the collision between the rotor shaft and the inner ring of the bearing, and thus improve the movement stability of the rotor shaft.

[0011] In some embodiments, the integrated outer ring of one or more bearings can extend into the mounting hole, and the integrated outer ring can be fixed to the mounting hole, so that the bearing assembly does not need to provide a separate bearing seat on the circumferential side of the bearing. On the one hand, this can avoid the matching problem of thermal expansion coefficients between the bearing seat and the bearing outer ring due to material differences. On the other hand, it can also reduce the radial size of the bearing assembly, thereby helping to reduce the overall volume of the motor.

[0012] In some other embodiments, the bearing assembly may also include a bearing seat, which may be sleeved on the circumference of one or more bearings, the bearing seat being fixedly connected to the one-piece outer ring of the one or more bearings, and one end of the bearing seat extending into the mounting hole of the base and fixedly connected to the inner wall of the mounting hole. This design can use the bearing seat to position and support the bearing, thereby simplifying the structure of the one-piece outer ring of the bearing to a certain extent, thereby reducing the difficulty of manufacturing the bearing assembly.

[0013] In some embodiments, the inner rings of two adjacent bearings may be spaced apart by a spacer to reduce the risk of collision between the inner rings of the adjacent bearings.

[0014] In some embodiments, the radial dimension of the end face of the code disc seat facing the rotor shaft may be smaller than the radial dimension of the outer ring of the bearing, and the end face of the code disc seat facing the rotor shaft may abut against the inner ring of the bearing arranged near the first end of the rotor shaft, so as to utilize the code disc seat to axially limit the bearing assembly at the first end of the rotor shaft and reduce the risk of shaking of the bearing assembly.

[0015] In addition, a limiting ring is fixed to the inner wall of the rotor housing, and the limiting ring is sleeved on the second end of the rotor shaft. The limiting ring can abut against the inner ring of the bearing arranged near the second end of the rotor shaft, thereby axially limiting the bearing assembly at the second end of the rotor shaft.

[0016] In some embodiments, when the code disc seat has a mounting groove at one end facing the rotor shaft, the inner wall of the first mounting groove may have an internal thread, and the outer wall of the rotor shaft near the first end of the rotor shaft may have an external thread, and the first end of the rotor shaft is threadedly screwed into the first mounting groove. In this way, the position of the code disc seat along the axial direction of the rotor shaft can be adjusted, and the pre-pressure on the inner ring of the bearing can be adjusted by adjusting the position of the code disc seat, compensating for insufficient or excessive pre-pressure caused by manufacturing errors of the bearing or wear during use, thereby helping to further improve the operating reliability of the motor.

[0017] In some embodiments, the motor may further include a pre-pressing assembly, which may include a first pressing plate, an elastic gasket, a second pressing plate, and a stopper, wherein the first pressing plate, the elastic gasket, and the second pressing plate are sequentially sleeved on the rotor shaft, and the stopper is located on the side of the second pressing plate facing away from the elastic gasket, and the stopper is fixed to the outer wall of the rotor shaft. The radial dimension of the end face of the first pressing plate facing away from the elastic gasket is smaller than the radial dimension of the outer ring of the bearing, and the end face of the first pressing plate facing away from the elastic gasket abuts against the inner ring of the bearing arranged near the first end of the rotor shaft; the two sides of the elastic gasket abut against the first pressing plate and the second pressing plate respectively, and the side of the second pressing plate facing away from the elastic gasket may abut against the stopper, so as to limit the second pressing plate through the stopper. Using the pre-pressing assembly to axially limit the inner ring of the bearing can also reduce the risk of axial shaking of the bearing. In addition, since the elastic gasket has a certain deformation capacity, it can compensate for insufficient or excessive pre-pressing caused by manufacturing errors of the bearing or wear during use, thereby helping to further improve the operating reliability of the motor.

[0018] Exemplarily, the pre-pressing assembly may include a plurality of stop blocks, which are arranged at intervals along the circumference of the rotor shaft, and each of the stop blocks may be an arc-shaped structure. The circumferential side of the rotor shaft may be provided with grooves corresponding to each of the stop blocks, each of the stop blocks may be fixed in the corresponding groove, and the outer arc side of the stop block may extend out of the groove, so that the second pressure plate is limited by the area of ​​each stop block extending out of the groove.

[0019] In some embodiments, the bearing assembly may include a bearing seat and a plurality of bearings arranged along the axial direction of the rotor shaft, the bearing seat is sleeved on the circumferential side of the plurality of bearings, and one end of the bearing seat may be fixedly connected to the base. The plurality of bearings are arranged at intervals along the axial direction of the rotor shaft, the inner ring of each bearing may be fixedly connected to the rotor shaft, and the outer ring of each bearing may be fixedly connected to the bearing seat, so that the bearing seat is used to support the plurality of bearings, and further the plurality of bearings are used to realize the rotational support of the rotor shaft.

[0020] In some embodiments, the motor may further include a stator assembly, which is located in the rotor housing and fixed to the circumference of the bearing assembly; the rotor assembly may further include a rotor core, which is fixed to the inner wall of the rotor housing and surrounded by the circumference of the stator assembly. When the stator assembly is energized, a magnetic field is formed around it, and the rotor core can rotate around the axis of the rotor shaft in the magnetic field, thereby driving the rotor housing and the rotor shaft to rotate synchronously, so that the motor can achieve power output.

[0021] In a second aspect, the present application further provides a mechanical device, which may include a component to be driven and a motor in any embodiment of the first aspect, wherein a rotor housing of the motor is in transmission connection with the component to be driven, and the motor may be used to drive the component to be driven to move. Since the size of the motor is reduced, it helps to achieve a miniaturized design of the mechanical device.

[0022] In some embodiments, the mechanical device may be a laser radar, and the component to be driven may be a reflector of the laser radar, and the reflector may be fixed to the circumferential surface of the rotor housing. When the motor is running, the rotor housing can drive the reflector to rotate.

[0023] In a third aspect, the present application further provides a traffic device, which includes the mechanical device in the second aspect. Exemplarily, the traffic device can be a vehicle. Taking the mechanical device as a laser radar as an example, the laser radar can be installed on the body of the vehicle, such as on the roof, to detect farther targets and obtain a better field of view. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the structure of a traffic device provided in an embodiment of the present application;

[0025] Figure 2A schematic diagram of the structure of a mechanical device provided in an embodiment of the present application;

[0026] Figure 3 A schematic diagram of an exploded structure of a motor provided in an embodiment of the present application;

[0027] Figure 4 Figure 3 A cross-sectional view of the motor shown in ;

[0028] Figure 5 A partial structural cross-sectional view of another motor provided in an embodiment of the present application;

[0029] Figure 6 A partial structural sectional view of another motor provided in an embodiment of the present application.

[0030] Reference numerals:

[0031] 1000-traffic equipment, vehicles; 1100-body; 1200-wheels; 1300-laser radar; 1310-housing; 1320-laser system;

[0032] 1321-transmitter; 1322-receiver; 1323-optical path turning device; 13231-motor; 13232-reflector;

[0033] 100- rotor assembly; 110- rotor housing; 111- end cover; 1111- opening; 1112- limiting ring; 120- rotor shaft;

[0034] 120a - first end of the rotor shaft; 120b - second end of the rotor shaft; 121 - extension portion; 122 - groove; 130 - rotor core;

[0035] 200-base; 210-mounting hole; 220-counter hole;

[0036] 300-bearing assembly; 310-bearing; 311-inner ring; 312-outer ring; 320-bearing seat; 321-hole shoulder;

[0037] 400- stator assembly;

[0038] 500-encoder assembly; 510-code disc seat; 511-first mounting groove; 512-second mounting groove; 513-protrusion; 520-code disc;

[0039] 530-circuit board; 530a-first side of the circuit board; 530b-second side of the circuit board; 531-encoder chip;

[0040] 600 - pre-pressing assembly; 610 - first pressing plate; 620 - elastic gasket; 630 - second pressing plate; 640 - limit block. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the present application clearer, the embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings. However, the example implementation can be implemented in various forms and should not be construed as being limited to the implementations set forth herein. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted. The words expressing position and direction described in the embodiments of the present application are all illustrated by taking the accompanying drawings as examples, but changes may be made as needed, and the changes made are all included in the scope of protection of the present application. The drawings of the embodiments of the present application are only used to illustrate the relative position relationship and do not represent the true proportion.

[0042] It should be noted that specific details are described in the following description to facilitate understanding of the present application. However, the embodiments of the present application can be implemented in a variety of other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the embodiments of the present application. Therefore, the present application is not limited to the specific implementation methods disclosed below.

[0043] As a driving device that can convert electrical energy into mechanical energy, the motor is widely used in various mechanical equipment to drive the driven parts of the mechanical equipment to move so that the mechanical equipment can achieve specific functions. Among them, the mechanical equipment includes but is not limited to various household appliances, industrial equipment, medical equipment or detection equipment. In the embodiment of the present application, the mechanical equipment is a laser radar as an example. Laser radar can be used in various transportation equipment such as vehicles and airplanes to detect the surrounding environment of the transportation equipment.

[0044] like Figure 1 As shown, Figure 1 A schematic diagram of the structure of a traffic device 1000 provided in an embodiment of the present application. Figure 1 The traffic device 1000 shown in the figure is described by taking a vehicle as an example. In the following embodiments, the vehicle and the traffic device 1000 have the same reference numerals. The vehicle 1000 includes a body 1100, wheels 1200, and a laser radar 1300, wherein the body 1100 is supported on the wheels 1200, and the laser radar 1300 is installed on the body 1100 to detect the driving conditions and surrounding environment of the vehicle 1000, thereby assisting the vehicle 1000 in realizing intelligent driving. Exemplarily, the laser radar 1300 can be installed on the roof of the body 1100 to detect targets farther away and obtain a better field of view.

[0045] refer to Figure 2 As shown, Figure 2The schematic diagram of the structure of a laser radar is shown. The laser radar 1300 may include a housing 1310 and a laser system 1320 disposed in the housing 1310. Among them, the housing 1310 may be used to protect the laser system 1320 to reduce the damage of the laser system 1320 to the external environment. In addition, the housing 1310 may be partially or entirely made of a light-transmitting material so that the laser system 1320 can emit light to the external space through the housing or receive light from the external space. In this embodiment, the laser system 1320 may include a transmitter 1321, a receiver 1322, and an optical path turning device 1323. The optical path turning device 1323 may be used to reflect the light (such as a pulsed laser) emitted by the transmitter 1321 to the external space. When the light detects a target object (such as a road, a pedestrian, a vehicle, etc.), it will be reflected. The optical path turning device 1323 can reflect the light reflected back by the target object to the receiver 1322 again, so that the laser radar 1300 can achieve the purpose of detecting the road condition or environment according to the received light.

[0046] In some embodiments, the optical path turning device 1323 can be arranged between the transmitter 1321 and the receiver 1322, and the optical path turning device 1323 can include a motor 13231 and a multi-faceted reflector 13232. Among them, the motor 13231 can include a rotor assembly, and the multi-faceted reflector 13232 can be fixed on the circumference of the rotor assembly. When the motor 13231 is running, the rotor assembly rotates around the axial direction of the motor 13231, thereby driving the reflector 13232 to rotate. It is easy to understand that the reflector 13232 is the driven component of the laser radar 1300. When the reflector 13232 rotates, the incident angle of the light emitted by the transmitter 1321 to the reflector 13232 will change, so that the exit angle of the light reflected by the reflector 13232 to the external space will also change accordingly, so that light can be emitted to the target object within a certain angle range, and accordingly, the receiver 1322 can also receive the light reflected back by the target object within a certain angle range, so that the external space can be scanned within a certain angle range.

[0047] Figure 3 A cross-sectional view of a motor provided in an embodiment of the present application, Figure 4 This is a schematic diagram of the exploded structure of the motor. Figure 3 and Figure 4 As shown, in an embodiment of the present application, in addition to the rotor assembly 100, the motor may also include a base 200, a bearing assembly 300, a stator assembly 400 and an encoder assembly 500, wherein the base 200 may be fixed in the housing of the laser radar to support the rotor assembly 100, the bearing assembly 300, the stator assembly 400 and the encoder assembly 500.

[0048] In the embodiment of the present application, the rotor assembly 100 may include a rotor housing 110 and a rotor shaft 120. The rotor housing 110 may be used as a carrier for the above-mentioned reflector, and the reflector may be fixed to the circumferential surface of the rotor housing 110. The rotor shaft 120 is fixedly connected to the rotor housing 110. In one implementation, the rotor housing 110 is sleeved on the outer circumference of the rotor shaft 120, and the rotor shaft 120 may include a first end 120a and a second end 120b arranged in the axial direction, and the first end 120a of the rotor shaft 120 may partially extend to the outside of the rotor housing 110, and the second end 120b of the rotor shaft 120 may be fixedly connected to the rotor housing 110. Exemplarily, along the axial direction of the rotor shaft 120, one end of the rotor housing 110 may be an open end, and the other end may be provided with an end cover 111, the end cover 111 of the rotor housing 110 has an opening 1111, the first end 120a of the rotor shaft 120 may extend to the outside of the rotor housing 110 through the open end of the rotor housing 110, and the second end 120b of the rotor shaft 120 may be fixed in the opening 1111.

[0049] In some embodiments, the second end 120b of the rotor shaft 120 may be interference fit with the opening 1111, so that the rotor shaft 120 is fixedly connected to the rotor housing 110. Of course, in other embodiments, the second end 120b of the rotor shaft 120 may also be fixed in the opening 1111 by welding, bonding, etc.

[0050] In addition, the rotor assembly 100 may further include a rotor core 130. The rotor core 130 may be fixed to the inner wall of the rotor housing 110 and may be arranged in an annular shape around the circumference of the rotor shaft 120. The rotor core 130 may be provided with a slot, which may extend along the axial direction of the rotor core 130 and penetrate through two end surfaces of the rotor core 130 along the axial direction, and a permanent magnet may be arranged in the slot to form a magnetic pole.

[0051] Please continue to refer to Figure 3 and Figure 4, the bearing assembly 300 may be sleeved on the circumference of the rotor shaft 120, and the bearing assembly 300 may be fixedly connected to the base 200 to rotatably support the rotor shaft 120 and the rotor housing 110 on the base 200. In one implementation, the base 200 is provided with a mounting hole 210, the first end 120a of the rotor shaft 120 extends to the outside of the rotor housing 110 through the open end of the rotor housing 110, and the first end 120a of the rotor shaft 120 may partially or completely extend into the mounting hole 210 of the base 200, and the end of the bearing assembly 300 corresponding to the first end 120a of the rotor shaft 120 may also extend to the outside of the rotor housing 110 through the open end of the rotor housing 110 and be fixed in the mounting hole 210 of the base 200. Exemplarily, the end of the bearing assembly 300 may be interference-fitted in the mounting hole 210 of the base 200, so as to achieve a fixed connection between the bearing assembly 300 and the base 200. Alternatively, the end of the bearing assembly 300 may also be fixed in the mounting hole 210 by welding, bonding, or the like.

[0052] The bearing assembly 300 may include one or more bearings 310. When there are multiple bearings 310, the multiple bearings 310 may be arranged in sequence along the axial direction of the rotor shaft 120 to support the rotor shaft 120 at multiple positions to improve the movement stability of the rotor shaft 120. In this embodiment, the inner rings 311 of the multiple bearings 310 are respectively fixedly connected to the rotor shaft 120, and the inner rings 311 of two adjacent bearings 310 may be spaced apart by a gasket 320 to reduce the risk of collision between the inner rings 311 of adjacent bearings 310. The outer rings 312 of the multiple bearings 310 may be an integral structure, and the outer rings 312 of the integral structure are fixedly connected to the base 200. This design can effectively improve the coaxiality of the multiple bearings 310, reduce the collision between the rotor shaft 120 and the inner rings 311 of the bearings 310, further improve the movement stability of the rotor shaft 120, and thus help improve the noise, vibration and harshness (NVH) performance of the motor.

[0053] In some embodiments, the one-piece outer ring 312 of one or more bearings 310 may extend directly into the mounting hole 210 of the base 200 and be fixedly connected to the inner wall of the mounting hole 210. In other words, the one-piece outer ring 312 of the bearing 310 may also function as a bearing seat, so the bearing assembly 300 does not need to set a separate bearing seat on the circumference of the bearing 310. This can avoid the problem of matching the coefficient of thermal expansion (CTE) caused by the material difference between the bearing seat and the outer ring 312 of the bearing 310, improve the running stability of the motor under different temperature environments, and also enable the bearing assembly 300 to achieve reliable support for the rotor shaft 120 with a relatively simple structure, effectively reduce the radial size of the bearing assembly 300, and thus help reduce the overall radial size of the motor. It has been verified that the design of fixing the one-piece outer ring 312 directly to the base 200 can reduce the radial size of the bearing assembly 300 by about 15%.

[0054] Of course, in some other embodiments, the bearing assembly may also include a bearing seat, in which case the bearing seat may be sleeved around the circumference of one or more bearings, the bearing seat is fixedly connected to the one-piece outer ring of the one or more bearings, and one end of the bearing seat extends into the mounting hole of the base and is fixedly connected to the inner wall of the mounting hole. This design can use the bearing seat to position and support the bearing, so it can simplify the structure of the one-piece outer ring of the bearing to a certain extent, thereby reducing the difficulty of manufacturing the bearing assembly.

[0055] In this embodiment, the stator assembly 400 may also be disposed in the rotor housing 110, and the stator assembly 400 is fixed to the peripheral side of the bearing assembly 300, for example, fixed to the outer wall of the integrated outer ring 312 of the plurality of bearings 310. The stator assembly 400 may include a stator core and a stator winding, and the stator winding is wound on the stator core. It can be seen that along the radial direction of the rotor shaft 120, the rotor shaft 120, the bearing assembly 300, the stator assembly 400, and the rotor core 130 are arranged in sequence, and the axis of the bearing assembly 300, the axis of the stator assembly 400, and the axis of the rotor core 130 can be roughly coaxial with the axis of the innermost rotor shaft 120. When the stator winding is energized, a magnetic field is formed around the stator core, and the rotor core 130 can rotate around the axis of the rotor shaft 120 in the magnetic field, thereby driving the rotor housing 110 and the rotor shaft 120 to rotate synchronously.

[0056] Please continue to refer to Figure 3 and Figure 4In the embodiment of the present application, the encoder assembly 500 may include a code disc seat 510, a code disc 520 and a circuit board 530. The code disc seat 510 may be fixedly connected to the first end 120a of the rotor shaft 120, and the code disc 520 may be fixed to the code disc seat 510, so that when the rotor shaft 120 rotates, the code disc seat 510 and the code disc 520 may be driven to rotate synchronously; the circuit board 530 may be fixed to the base 200, and an encoder chip 531 is disposed on the circuit board 530, and the encoder chip 531 and the code disc 520 are disposed opposite to each other along the axial direction of the rotor shaft 120, so that the encoder chip 531 can sense the code disc 520, and then the rotation speed of the rotor shaft 120 is obtained according to the rotation detection of the code disc 520.

[0057] In the embodiment of the present application, the code disc 520 is fixed to the rotor shaft 120 through the code disc seat 510. The cross-sectional shape of the code disc 520 can be circular. Along the axial direction of the rotor shaft 120, the code disc 520 and the rotor shaft 120 are arranged opposite to each other, and the axis of the code disc 520 and the axis of the rotor shaft 120 can be roughly coaxially arranged. In this way, when installing the code disc 520, the radial space occupied by the motor can be significantly reduced. Compared with the solution of installing the code disc 520 on the rotor housing 110 in the prior art, the radial size of the motor provided by the embodiment of the present application can be reduced by about 30%.

[0058] As mentioned above, the first end 120a of the rotor shaft 120 can extend into the mounting hole 210 of the base 200, and the code disc seat 510 is fixedly connected to the first end 120a of the rotor shaft 120, so the code disc seat 510 and the code disc seat 510 installed on the code disc seat 510 can also be located in the mounting hole 210. The end of the code disc seat 510 facing the rotor shaft 120 can have a first mounting groove 511, and the first end 120a of the rotor shaft 120 can be inserted into the first mounting groove 511 to fix the code disc seat 510 relative to the rotor shaft 120. In a specific implementation, the first end 120a of the rotor shaft 120 can have an extension portion 121, and the extension portion 121 can be used to be plugged and matched with the first mounting groove 511. The radial dimension of the extension portion 121 may be smaller than the radial dimension of the rotor shaft 120, so that the radial dimension of the first mounting groove 511 matched with the extension portion 121 is also reduced, so that the code disc seat 510 can be fixedly connected to the rotor shaft 120 with a relatively small radial dimension. The end of the code disc seat 510 facing away from the rotor shaft 120 may have a second mounting groove 512, and the code disc 520 may be fixed in the second mounting groove 512. Exemplarily, the code disc 520 may be fixed in the second mounting groove 512 by bonding, interference fit, etc.

[0059] In this embodiment, the axis of the first mounting groove 511 and the axis of the second mounting groove 512 are also substantially coaxially arranged, so that the first mounting groove 511 can be used to radially position the rotor shaft 120, and the second mounting groove 512 can be used to radially position the code disc 520, thereby reducing the difficulty of coaxial installation of the rotor shaft 120 and the code disc 520. In addition, the first mounting groove 511 and the second mounting groove 512 can be connected to each other, so as to reduce the thickness of the code disc seat 510, thereby helping to reduce the overall axial size of the motor.

[0060] Please continue to refer to Figure 3 and Figure 4 In the embodiment of the present application, the radial dimension of the end face of the code disc seat 510 facing the rotor shaft 120 may be smaller than the radial dimension of the outer ring 312 of the bearing 310. Exemplarily, along the radial direction of the rotor shaft 120, the code disc seat 510 may be located on the inner side of the integrated outer ring 312 of the bearing assembly 300. Taking a plane perpendicular to the axial direction of the rotor shaft 120 as a reference plane, the projection of the end face of the code disc seat 510 facing the rotor shaft 120 in the reference plane at least partially overlaps with the projection of the inner ring 311 of the bearing 310 in the reference plane, so that the end face of the code disc seat 510 facing the rotor shaft 120 can abut against the inner ring 311 of the bearing 310 disposed near the first end 120a of the rotor shaft 120.

[0061] In addition, the end cover 111 of the rotor housing 110 may have a limiting ring 1112 extending toward the interior of the rotor housing 110, and the limiting ring 1112 may be arranged around the opening 1111 set in the end cover 111. Similarly, the projection of the limiting ring 1112 on the reference plane is located on the inner side of the projection of the outer ring 312 of the bearing 310 in the reference plane, and the projection of the limiting ring 1112 on the reference plane at least partially overlaps with the projection of the inner ring 311 of the bearing 310 in the reference plane, so that the limiting ring 1112 can abut against the inner ring 311 of the bearing 310 set near the second end 120b of the rotor shaft 120.

[0062] It can be seen from the above description that the upper end of the bearing assembly 300 can be limited by the rotor housing 110, and the lower end of the bearing assembly 300 can be limited by the code disc seat 510, thereby achieving axial positioning of the bearing assembly 300, thereby reducing the risk of axial shaking of the bearing assembly 300, and further improving the NVH performance of the motor.

[0063] In some embodiments, the inner wall of the first mounting groove 511 may have an internal thread, and accordingly, the outer wall of the rotor shaft 120 near the first end 120a of the rotor shaft 120 has an external thread matching the internal thread, and the first end 120a of the rotor shaft 120 may be fixed in the first mounting groove 511 by threaded connection. It is easy to understand that in the case where the first end 120a of the rotor shaft 120 has an extension portion 121, the external thread may be formed on the outer wall of the extension portion 121. The code disc seat 510 is screwed to the first end of the rotor shaft 120 by threaded connection, so that the position of the code disc seat 510 along the axial direction of the rotor shaft 120 can be adjusted, and then the pre-pressure on the inner ring 311 of the bearing 310 can be adjusted by adjusting the position of the code disc seat 510, and the insufficient or excessive pre-pressure caused by the manufacturing error of the bearing 310 or the wear during use is compensated, thereby helping to further improve the operating reliability of the motor.

[0064] In addition, based on the pre-stressing effect of the code disc seat 510 on the inner ring 311 of the bearing 310, in this embodiment, there is no need to set a separate pre-stressing structure on the circumferential side of the rotor shaft 120, so the axial space of the rotor shaft 120 can be saved, and the length of the rotor shaft 120 can also be reduced, thereby reducing the overall axial size of the motor. Verification shows that the design of using the code disc seat 510 to pre-stress the bearing 310 can reduce the axial size of the motor by about 10%.

[0065] In this embodiment, a countersunk hole 220 may be provided on one side end surface of the base 200 facing away from the rotor housing 110, that is, the lower end surface of the base 200. The countersunk hole 220 is connected to the mounting hole 210, and in a specific implementation, the radial dimension of the countersunk hole 220 may be greater than the radial dimension of the mounting hole 210, and a step surface may be formed between the countersunk hole 220 and the mounting hole 210. The circuit board 530 of the encoder assembly 500 may be installed in the countersunk hole 220, and the circuit board 530 includes a first surface 530a and a second surface 530b, wherein the first surface 530a of the circuit board 530 is arranged toward the rotor housing 110, and the second surface 530b of the circuit board 530 is arranged away from the rotor housing 110. The circuit board 530 may be fixed in the countersunk hole 220 by a fastener, or the edge area of ​​the first surface 530a of the circuit board 530 may be bonded to the above-mentioned step surface by an adhesive, so as to fix the circuit board 530 in the countersunk hole 220.

[0066] The encoder chip 531 can be arranged on the first surface 530a of the circuit board 530, and the encoder chip 531 is located in the area on the first surface 530a of the circuit board 530 opposite to the mounting hole 210. That is to say, after the circuit board 530 is installed in the countersunk hole 220, the encoder chip 531 can be located in the area on the first surface 530a of the circuit board 530 exposed in the mounting hole 210, so that the encoder chip 531 can be positioned opposite to the code disk 520 located in the mounting hole 210.

[0067] In addition, the second surface 530b of the circuit board 530 and the lower end surface of the base 200 may have a certain height difference, and the height difference can be controlled by designing the depth of the countersunk hole 220. By utilizing the height difference, other electronic components, such as a power module, etc., can be arranged on the second surface 530b of the circuit board 530 to ensure the reliable operation of the motor. By designing that electronic components can be arranged on both sides of the circuit board 530, the space utilization rate on the circuit board 530 can be increased by about 15%.

[0068] Figure 5 A partial structural cross-sectional view of another motor provided in an embodiment of the present application. Figure 5 As shown, in the embodiment of the present application, the motor may also include a base, a rotor assembly, a stator assembly, a bearing assembly 300 and an encoder assembly, wherein the structure and relative position relationship of each assembly can refer to Figure 3 , 4 Different from the above-mentioned embodiment, in this embodiment, the motor may further include a pre-loading assembly 600. At this time, the upper end of the bearing assembly 300 may be positioned by the rotor housing, and the lower end of the bearing assembly 300 may be axially pre-loaded by the pre-loading assembly 600.

[0069] In a specific implementation, the pre-pressing assembly 600 may include a first pressing plate 610, an elastic gasket 620, a second pressing plate 630, and a stopper 640, wherein the first pressing plate 610, the elastic gasket 620, and the second pressing plate 630 may all be annular structures, and the first pressing plate 610, the elastic gasket 620, and the second pressing plate 630 are sequentially sleeved on the circumference of the rotor shaft 120 from the first end 120a of the rotor shaft 120, and the stopper 640 is located on the side of the second pressing plate 630 facing away from the elastic gasket 620, and the stopper 640 is fixed to the outer wall of the rotor shaft 120. The radial dimension of the end surface of the first pressing plate 610 facing the second end 120b of the rotor shaft 120 may be smaller than the radial dimension of the outer ring 312 of the bearing 310. In addition, still taking a plane perpendicular to the axial direction of the rotor shaft 120 as a reference plane, the projection of the end surface of the first pressing plate 610 facing away from the elastic gasket 620 in the reference plane at least partially overlaps with the projection of the inner ring 311 of the bearing 310 in the reference plane, so that the end surface of the first pressing plate 610 can abut against the inner ring 311 of the bearing 310 disposed near the first end 120a of the rotor shaft 120. Both sides of the elastic gasket 620 abut against the first pressing plate 610 and the second pressing plate 630 respectively, and the side of the second pressing plate 630 facing away from the elastic gasket 620 can abut against the limit block 640, so that the second pressing plate 630 is limited by the limit block 640.

[0070] In some embodiments, the stopper 640 may also be an annular structure, in which case the stopper 640 may be sleeved on the rotor shaft 120. In other embodiments, the pre-pressing assembly 600 may include a plurality of stopper blocks 640, which are arranged at intervals along the circumference of the rotor shaft 120, and each stopper block 640 may be an arc-shaped structure. Taking the pre-pressing assembly 600 including a plurality of arc-shaped stopper blocks 640 as an example, the circumferential side of the rotor shaft 120 may be provided with grooves 122 corresponding to each stopper block 640, each stopper block 640 may be fixed in the corresponding groove 122, and the outer arc side of the stopper block 640 may extend out of the groove 122, so as to limit the second pressure plate 630 through the area extending out of the groove 122 by each stopper block 640. Alternatively, the stopper block 640 may also be fixed to the outer wall of the rotor shaft 120 by welding, bonding, or the like.

[0071] In this embodiment, the inner ring 311 of the bearing 310 is axially limited by the preload assembly 600, which can also reduce the risk of axial shaking of the bearing 310, thereby improving the NVH performance of the motor. In addition, since the elastic gasket 620 has a certain deformation capacity, it can compensate for insufficient or excessive preload caused by manufacturing errors of the bearing 310 or wear during use, thereby helping to further improve the operating reliability of the motor.

[0072] In addition, in this embodiment, the rotor shaft 120 and the code disc seat 510 can be fixedly connected in the manner of the above-mentioned embodiment, that is, the first end 120a of the rotor shaft 120 is inserted into the first mounting groove 511 of the code disc seat 510 (refer to Figure 3 Alternatively, you can also refer to Figure 4 In the manner shown in , a blind hole 123 is provided at the first end 120a of the rotor shaft 120, and correspondingly, a protrusion 513 is provided on the end surface of the code disc seat 510 facing the rotor shaft 120, and the rotor shaft 120 and the code disc seat 510 are fixedly connected by inserting the protrusion 513 of the code disc seat 510 into the blind hole 123. Exemplarily, the protrusion 513 and the blind hole 123 can be fixedly connected by interference fit, threaded connection, etc.

[0073] Figure 6 A partial structural cross-sectional view of another motor provided in an embodiment of the present application. Figure 6 As shown, in the embodiment of the present application, the motor may also include a base, a rotor assembly, a stator assembly, a bearing assembly 300 and an encoder assembly, wherein the structures and relative positional relationships of the rotor assembly, the stator assembly and the encoder assembly may refer to Figure 3 , 4 The bearing assembly 300 is designed according to the embodiment shown in , while a plurality of bearings 310 are designed in a split manner.

[0074] In a specific implementation, the bearing assembly 300 may further include a bearing seat 320, which is sleeved on the circumferential side of the plurality of bearings 310, and one end of the bearing seat 320 may be fixedly connected to the base. The plurality of bearings 310 are arranged at intervals along the axial direction of the rotor shaft 120, the inner ring 311 of each bearing 310 may be fixedly connected to the rotor shaft 120, and the outer ring 312 of each bearing 310 may be fixedly connected to the bearing seat 320, so that the bearing seat 320 is used to support the plurality of bearings 310, and further the plurality of bearings 310 are used to realize the rotation support of the rotor shaft 120.

[0075] In some embodiments, the inner wall of the bearing seat 320 may be provided with shoulder holes corresponding to the plurality of bearings 310, one end of each bearing 310 may abut against the corresponding shoulder hole 321, and the other end may be limited by a preloading component, so that the axial positioning and preloading of each bearing 310 can be achieved. Figure 5 The embodiment shown is designed and will not be described in detail here.

[0076] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A motor, characterized in that: It includes a base, a rotor assembly, a bearing assembly and an encoder assembly, wherein: The base has a mounting hole; The rotor assembly comprises a rotor housing and a rotor shaft, wherein the rotor shaft is fixedly connected to the rotor housing, and the first end of the rotor shaft entirely or partially extends into the mounting hole; The bearing assembly is sleeved on the circumferential side of the rotor shaft, and one end of the bearing assembly is fixed to the mounting hole to rotatably support the rotor shaft on the base; The encoder assembly includes a code disc seat, a code disc and a circuit board. The code disc seat is fixedly connected to the first end of the rotor shaft, the code disc is fixed to the code disc seat, the axis of the code disc is coaxially arranged with the axis of the rotor shaft, the circuit board is fixed to the base, and the circuit board is provided with an encoder chip, and the encoder chip and the code disc are arranged opposite to each other along the axial direction of the rotor shaft.

2. The motor according to claim 1, characterized in that A countersunk hole is provided on one end surface of the base facing away from the rotor housing, and the countersunk hole is communicated with the mounting hole; The circuit board is arranged in the countersunk hole, and the encoder chip is arranged in the area of ​​the circuit board exposed in the mounting hole.

3. The motor according to claim 1 or 2, characterized in that: The end of the code disc seat facing the rotor shaft has a first mounting groove, and the end of the code disc seat facing away from the rotor shaft has a second mounting groove; The first end of the rotor shaft is inserted into the first mounting groove, and the code disc is arranged in the second mounting groove.

4. The motor according to any one of claims 1 to 3, characterized in that: The bearing assembly includes one or more bearings arranged along the axial direction of the rotor shaft, one or more inner rings of the bearings are respectively fixedly connected to the rotor shaft, and one or more outer rings of the bearings are an integral structure.

5. The motor according to claim 4, characterized in that One or more outer rings of the bearings extend into the mounting hole and are fixed to the mounting hole.

6. The motor according to claim 4, characterized in that The bearing assembly also includes a bearing seat, which is sleeved on the circumferential side of one or more bearings, the bearing seat is fixedly connected to the outer ring of one or more bearings, and one end of the bearing seat along the axial direction of the rotor shaft is fixed to the mounting hole.

7. The motor according to any one of claims 4 to 6, characterized in that: The inner rings of two adjacent bearings are spaced apart by a gasket.

8. The motor according to any one of claims 4 to 7, characterized in that: The radial dimension of the end surface of the code disc seat facing the rotor shaft is smaller than the radial dimension of the outer ring of the bearing, and the end surface of the code disc seat facing the rotor shaft abuts against the inner ring of the bearing arranged near the first end of the rotor shaft.

9. The motor according to claim 8, characterized in that The code disc seat has a first mounting groove at one end facing the rotor shaft, the inner wall of the first mounting groove has an internal thread, the outer wall of the rotor shaft near the first end of the rotor shaft has an external thread, and the first end of the rotor shaft is threadedly screwed into the first mounting groove.

10. The motor according to any one of claims 4 to 9, characterized in that: The motor further includes a pre-pressing assembly, which includes a first pressing plate, an elastic gasket, a second pressing plate and a limit block, wherein the first pressing plate, the elastic gasket and the second pressing plate are sequentially sleeved on the rotor shaft, and the limit block is located on a side of the second pressing plate facing away from the elastic gasket and fixed to an outer wall of the rotor shaft; The radial dimension of the end surface of one end of the first pressure plate facing away from the elastic gasket is smaller than the radial dimension of the outer ring of the bearing, and the end surface of the first pressure plate facing away from the elastic gasket abuts against the inner ring of the bearing arranged near the first end of the rotor shaft; Two sides of the elastic gasket are respectively in contact with the first pressing plate and the second pressing plate; The side of the second pressing plate facing away from the elastic gasket abuts against the limiting block.

11. The motor according to any one of claims 1 to 3, characterized in that: The bearing assembly comprises a bearing seat and a plurality of bearings arranged along the axial direction of the rotor shaft, the bearing seat is sleeved on the circumferential sides of the plurality of bearings, and one end of the bearing seat along the axial direction of the rotor shaft is fixed to the mounting hole; The inner ring of each bearing is fixedly connected to the rotor shaft, and the outer ring of each bearing is fixedly connected to the bearing seat.

12. The motor according to any one of claims 1 to 11, characterized in that: The motor further comprises a stator assembly, wherein the stator assembly is located in the rotor housing and is fixed to a peripheral side of the bearing assembly; The rotor assembly further includes a rotor core, which is fixed to the inner wall of the rotor housing and is disposed around the circumference of the stator assembly.

13. A mechanical device, characterized in that: It comprises a component to be driven and a motor as claimed in any one of claims 1 to 12, wherein a rotor housing of the motor is drivingly connected to the component to be driven, and the motor is used to drive the component to be driven to move.

14. The mechanical device according to claim 13, characterized in that The mechanical device is a laser radar, the component to be driven is a reflector of the laser radar, and the reflector is fixed to the circumferential side surface of the rotor housing.

15. A traffic device, characterized in that: Comprising a mechanical device as claimed in claim 13 or 14.

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