Outer rotor motor and fan

Abstract

The external rotor motor comprises a rotating shaft, a stator assembly, an external rotor assembly, a bearing sleeve seat, a control circuit board, a first bearing and a second bearing, a rotor shell comprises a machine shell sleeve, a top end plate and a bottom end plate, and a permanent magnet is installed on the inner wall face of the machine shell sleeve; a second bearing is mounted on a second bearing seat of the bottom end plate; a first bearing seat at the top of the bearing sleeve seat is provided with a first bearing, and the rotating shaft is inserted into the first bearing; the middle part of the bearing sleeve seat is supported and mounted on the second bearing; the bottom of the bearing sleeve seat extends out of the bottom end plate, a first groove is dug in the bottom end face of the bearing sleeve seat, a wire passing hole is formed in the middle of the bearing sleeve seat, and a power supply lead penetrates through the wire passing hole, reaches the interior of the motor inner cavity and is electrically connected with a control circuit board. And the device can be applied to work in a severe environment.

Description

Technical Field

[0001] The utility model relates to an external rotor motor and a fan. Background Art

[0002] With the wide application of DC brushless external rotor motors (in the field of fans), the requirements for motor protection are getting higher and higher. Therefore, it is necessary to improve the protection level of the motor. A motor with good protection level can operate in a more severe environment.

[0003] The structure of the existing DC brushless external rotor motor was not designed considering the use conditions of high protection at the beginning. The existing motor structure does not adopt protective measures to protect the motor, but cooperates with the fan structure for protection, which is not suitable for the new requirements of the motor. Specifically, see the invention patent with the patent number: CN202311119730 and the name: A stator assembly of an external rotor motor and an external rotor motor. The structure of this patent is that the bearing sleeve seat is press-fitted with the stator assembly. Bearing chambers are respectively arranged at both ends of the bearing sleeve seat, bearings are installed in the bearing chambers, the rotating shaft is inserted into the bearing sleeve seat and supported on the bearings, and the circuit board assembly cooperates with the stator assembly to complete the connection effect; after the bearings, rotor assembly and other accessories are clamped with a circlip, the motor assembly is completed; the original structure of the motor has no waterproof protection ability, the circuit board is exposed, the leads are exposed, and the dust and waterproof performance is extremely poor, making it difficult to be applied to work in a severe environment. Summary of the Invention

[0004] The purpose of the utility model is to provide an external rotor motor and a fan, so as to solve the technical problems in the prior art that the protection ability of the structural layout of the external rotor motor is low, the circuit board is exposed, the leads are exposed, the dust and waterproof performance is extremely poor, and it is difficult to be applied to work in a severe environment.

[0005] The technical solution of the utility model is realized as follows:

[0006] An external rotor motor includes a rotating shaft, a stator assembly, an external rotor assembly, a bearing sleeve seat, a control circuit board, a first bearing and a second bearing, wherein:

[0007] The stator assembly includes a stator core, end insulation and a coil winding. The coil winding is wound on the stator core, and the end insulation is used to isolate the coil winding and the stator core. The control circuit board is installed on the end insulation;

[0008] The external rotor assembly includes a rotor housing and a permanent magnet. The rotor housing includes a housing sleeve, a top plate and a bottom plate. The top plate and the bottom plate are respectively installed at the top and bottom of the housing sleeve to form a motor inner cavity. The permanent magnet is installed on the inner wall surface of the housing sleeve; a second bearing seat is arranged in the middle of the bottom plate, and the second bearing is installed in the second bearing seat; a through hole is arranged on the bottom plate, the through hole is located at the center of the second bearing seat, and the middle part of the bearing sleeve seat passes through the through hole;

[0009] The stator assembly is sleeved outside the bearing sleeve seat and is located between the first bearing and the second bearing. The housing sleeve and the permanent magnet are sleeved around the stator assembly;

[0010] It is characterized in that: a first bearing seat is dug out on the top surface of the bearing sleeve seat, the first bearing is installed inside the bearing seat, one end of the rotating shaft is connected to the middle of the top end plate, and the other end of the rotating shaft is inserted on the first bearing; the middle part of the bearing sleeve seat is supported and installed on the second bearing;

[0011] The bottom of the bearing sleeve seat extends out of the bottom end plate. A first groove is dug on the bottom end surface of the bearing sleeve seat. A wire passing hole is arranged in the middle of the bearing sleeve seat. The power supply lead passes through the wire passing hole and reaches the inside of the motor cavity to be electrically connected to the control circuit board.

[0012] A sealing ring is nested and installed at the edge of the through hole. The sealing ring is sleeved outside the bearing sleeve seat to play a sealing role.

[0013] A first groove is dug on the bottom end surface of the above-mentioned bearing sleeve seat. The first groove communicates with the wire passing hole. The size of the first groove is larger than the diameter of the wire passing hole. A sealing plug is arranged on the power supply lead. The sealing plug is nested and installed in the first groove to seal the wire passing hole.

[0014] An upward flanging is arranged outside the bottom end of the housing sleeve. The upward flanging is installed on the bottom end plate through a plurality of screws. An elastic washer is arranged between the upward flanging and the bottom end plate.

[0015] A step is arranged in the middle of the above-mentioned bearing sleeve seat. The step abuts against the top end of the second bearing. The bottom end of the second bearing is pressed by a second washer. The second washer is installed at the bottom of the second bearing seat.

[0016] External threads are arranged on the outer periphery of the bottom of the above-mentioned bearing sleeve seat and a mounting seat is installed. A threaded hole is arranged in the middle of the mounting seat. The bottom of the bearing sleeve seat is inserted into the threaded hole to form a threaded connection. A plurality of mounting holes are arranged on the mounting seat around the threaded hole for facilitating load connection.

[0017] A first convex ring and a second convex ring are axially arranged on the bottom surface of the bottom end plate. The first convex ring is located outside the second convex ring. The second convex ring is located outside the through hole. A second groove is formed between the first convex ring and the second convex ring. The edge of the mounting seat protrudes axially upward to form a convex platform. The convex platform is nested in the second groove to form a labyrinth seal structure.

[0018] A blower includes an outer rotor motor and a wind wheel. It is characterized in that: the above-mentioned outer rotor motor is adopted for the outer rotor motor.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] 1. The rotor housing of the outer rotor motor of the present utility model includes a housing sleeve, a top plate and a bottom plate. The top plate and the bottom plate are respectively installed at the top and bottom of the housing sleeve to form a motor inner cavity. Permanent magnets are installed on the inner wall surface of the housing sleeve; a second bearing seat is provided in the middle of the bottom plate, and a second bearing is installed in the second bearing seat; a through hole is provided on the bottom plate, and the through hole is located at the center of the second bearing seat. The middle part of the bearing sleeve seat passes through the through hole; the stator assembly is sleeved outside the bearing sleeve seat and is located between the first bearing and the second bearing. The housing sleeve and the permanent magnets are sleeved outside the stator assembly; a first bearing seat is dug out on the top surface of the bearing sleeve seat, and a first bearing is installed in the bearing seat. One end of the rotating shaft is connected to the middle of the top plate, and the other end of the rotating shaft is inserted on the first bearing; the middle part of the bearing sleeve seat is supported and installed on the second bearing; the bottom of the bearing sleeve seat extends out of the bottom plate, and a first groove is dug on the bottom end surface of the bearing sleeve seat. A wire passing hole is provided in the middle of the bearing sleeve seat, and the power supply lead passes through the wire passing hole to reach the inside of the motor inner cavity and is electrically connected to the control circuit board. This new structural design: the stator assembly and the circuit board are all placed inside the motor inner cavity, with high protection ability, no exposed leads, good dust and water resistance, improving the overall protection level, and can meet the requirements for working in harsh environments.

[0021] 2. Other advantages of the present utility model are described in detail in the embodiment part of the specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a perspective view of the outer rotor motor according to Embodiment 1 of the present utility model from one angle;

[0023] Figure 2 is a perspective view of the outer rotor motor according to Embodiment 1 of the present utility model from another angle;

[0024] Figure 3 is an exploded view of the outer rotor motor according to Embodiment 1 of the present utility model from one angle;

[0025] Figure 4 is an exploded view of the outer rotor motor according to Embodiment 1 of the present utility model from another angle;

[0026] Figure 5 is the front view of the outer rotor motor according to Embodiment 1 of the present utility model;

[0027] Figure 6 is Figure 5 the A-A sectional view of

[0028] Figure 7 is Figure 6 the partial enlarged view of part B of

[0029] Figure 8 is the partial exploded view of Embodiment 1 of the present utility model;

[0030] Figure 9 This is a three-dimensional view of the fan in the second embodiment of the present utility model. Detailed implementation manners

[0031] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0032] Embodiment 1:

[0033] As Figures 1 to 8 shown, this embodiment provides an outer rotor motor, which includes a rotating shaft 1, a stator assembly 2, an outer rotor assembly 3, a bearing sleeve seat 4, a control circuit board 5, a first bearing 6 and a second bearing 7, wherein:

[0034] The stator assembly 2 includes a stator core 21, end insulation 22 and a coil winding 23. The coil winding 23 is wound around the stator core 21, and the end insulation 22 is used to isolate the coil winding 23 and the stator core 21. The control circuit board 5 is installed on the end insulation 22;

[0035] The outer rotor assembly 3 includes a rotor housing and a permanent magnet 34. The rotor housing includes a housing sleeve 31, a top plate 32 and a bottom plate 33. The top plate 32 and the bottom plate 33 are respectively installed on the top and bottom of the housing sleeve 31 to form a motor inner cavity 100. The permanent magnet 34 is installed on the inner wall surface of the housing sleeve 31; A second bearing seat 331 is provided in the middle of the bottom plate 33, and the second bearing 7 is installed in the second bearing seat 331; A through hole 330 is provided on the bottom plate 33, and the through hole 330 is located at the center of the second bearing seat 331. The middle part of the bearing sleeve seat 4 passes through the through hole 330;

[0036] The stator assembly 2 is sleeved outside the bearing sleeve seat 4 and is located between the first bearing 6 and the second bearing 7. The housing sleeve 31 and the permanent magnet 34 are sleeved outside the stator assembly 2;

[0037] It is characterized in that: a first bearing seat 41 is dug out on the top surface of the bearing sleeve seat 4, the first bearing 6 is installed in the bearing seat 41, one end of the rotating shaft 1 is connected to the middle of the top plate 32, and the other end of the rotating shaft 1 is inserted on the first bearing 6; The middle part of the bearing sleeve seat 4 is supported and installed on the second bearing 7;

[0038] The bottom of the bearing sleeve seat 4 extends out of the bottom end plate 33. A first groove 42 is dug on the bottom end face of the bearing sleeve seat 4. A wire passing hole 43 is provided in the middle of the bearing sleeve seat 4. The power supply lead 8 passes through the wire passing hole 43 and reaches the inside of the motor cavity 100 to be electrically connected to the control circuit board 5.

[0039] The outer rotor motor with this structure has the following advantages: The rotor housing includes a housing sleeve 31, a top end plate 32 and a bottom end plate 33. The top end plate 32 and the bottom end plate 33 are respectively installed at the top and bottom of the housing sleeve 31 and form the motor cavity 100. The stator assembly 2 and the circuit board 5 are all placed inside the motor cavity 100. It has high protection ability, the power supply lead 8 is not exposed, and it has good dust and waterproof performance, improving the overall protection level and can meet the requirements of working in harsh environments.

[0040] A sealing ring 10 is nested and installed at the edge of the through hole 330. The sealing ring 10 is sleeved outside the bearing sleeve seat 4 to play a sealing role, increasing the sealing protection level and having better dust and waterproof performance.

[0041] A first groove 42 is dug on the bottom end face of the above-mentioned bearing sleeve seat 4. The first groove 42 communicates with the wire passing hole 43. The size of the first groove 42 is larger than the diameter of the wire passing hole 43. A sealing plug 9 is provided on the power supply lead 8. The sealing plug 9 is nested and installed in the first groove 42 to seal the wire passing hole 43, preventing external water from entering the motor cavity 100 along the power supply lead 8, having good dust and waterproof performance, improving the overall protection level and can meet the requirements of working in harsh environments.

[0042] A flanging 311 is provided outside the bottom end of the housing sleeve 31. The flanging 311 and the bottom end plate 33 are installed together by a number of screws 11. An elastic washer 12 is provided between the flanging 311 and the bottom end plate 33, and the assembly is simple and convenient.

[0043] A step 44 is provided in the middle of the above-mentioned bearing sleeve seat 4. The step 44 abuts against the top end of the second bearing 7. The bottom end of the second bearing 7 is pressed by the second washer 13. The second washer 13 is installed at the bottom of the second bearing seat 331, and the structure is simple and the installation is convenient.

[0044] External threads are provided on the outer periphery of the bottom of the above-mentioned bearing sleeve seat 4 and a mounting seat 200 is installed. A threaded hole 201 is provided in the middle of the mounting seat 200. The bottom of the bearing sleeve seat 4 is inserted into the threaded hole 201 to form a threaded connection. A number of mounting holes 202 are provided on the mounting seat 200 outside the threaded hole 201 for easy load connection. This detachable design facilitates the overall assembly of the motor.

[0045] Axially arrange a first convex ring 332 and a second convex ring 333 on the bottom surface of the bottom end plate 33. The first convex ring 332 is located outside the second convex ring 333, and the second convex ring 333 is located around the through hole 330. A second groove 334 is formed between the first convex ring 332 and the second convex ring 333. The edge of the mounting seat 200 protrudes axially upward to form a convex platform 203, and the convex platform 203 is nested in the second groove 334 to form a labyrinth seal structure. It has good dust and waterproof performance, improves the overall protection level, and can meet the requirements of working in harsh environments.

[0046] Embodiment 2:

[0047] As Figure 9 shown, a blower includes an outer rotor motor and a wind wheel, and is characterized in that: the outer rotor motor adopts the outer rotor motor described in Embodiment 1

[0048] The above embodiments are the preferred embodiments of the present invention, but the embodiments of the present invention are not limited thereto. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention are equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. An external rotor motor, comprising a rotating shaft (1), a stator assembly (2), an external rotor assembly (3), a bearing sleeve seat (4), a control circuit board (5), a first bearing (6) and a second bearing (7), wherein: The stator assembly (2) includes a stator core (21), end insulation (22) and a coil winding (23). The coil winding (23) is wound on the stator core (21), and the end insulation (22) is used to isolate the coil winding (23) from the stator core (21). The control circuit board (5) is mounted on the end insulation (22); The external rotor assembly (3) includes a rotor housing and permanent magnets (34). The rotor housing includes a casing sleeve (31), a top plate (32) and a bottom plate (33). The top plate (32) and the bottom plate (33) are respectively mounted on the top and bottom of the casing sleeve (31) to form a motor inner cavity (100). Permanent magnets (34) are mounted on the inner wall surface of the casing sleeve (31); A second bearing seat (331) is provided in the middle of the bottom plate (33), and the second bearing (7) is mounted in the second bearing seat (331); A through hole (330) is provided in the bottom plate (33), and the through hole (330) is located at the center of the second bearing seat (331). The middle part of the bearing sleeve seat (4) passes through the through hole (330); The stator assembly (2) is sleeved outside the bearing sleeve seat (4) and is located between the first bearing (6) and the second bearing (7). The casing sleeve (31) and the permanent magnets (34) are sleeved outside the stator assembly (2); It is characterized in that: a first bearing seat (41) is dug out on the top surface of the bearing sleeve seat (4), the first bearing (6) is mounted in the bearing seat (41), one end of the rotating shaft (1) is connected to the middle of the top plate (32), and the other end of the rotating shaft (1) is inserted on the first bearing (6); The middle part of the bearing sleeve seat (4) is supported and mounted on the second bearing (7); The bottom of the bearing sleeve seat (4) extends out of the bottom plate (33). A first groove (42) is dug on the bottom end surface of the bearing sleeve seat (4). A wire passing hole (43) is provided in the middle of the bearing sleeve seat (4). A power lead (8) passes through the wire passing hole (43) to reach the inside of the motor inner cavity (100) and is electrically connected to the control circuit board (5).

2. The external rotor motor according to claim 1, wherein: A sealing ring (10) is nested and mounted on the edge of the through hole (330). The sealing ring (10) is sleeved outside the bearing sleeve seat (4) to play a sealing role.

3. The external rotor motor according to claim 1, characterized in that: A first groove (42) is dug on the bottom end surface of the bearing sleeve seat (4). The first groove (42) communicates with the wire passing hole (43). The size of the first groove (42) is larger than the diameter of the wire passing hole (43). A sealing plug (9) is provided on the power lead (8). The sealing plug (9) is nested and mounted in the first groove (42) to seal the wire passing hole (43).

4. An external rotor motor according to claim 1 or 2 or 3, characterized in that: An upward flanging (311) is provided outside the bottom end of the casing sleeve (31). The upward flanging (311) is mounted on the bottom plate (33) through a plurality of screws (11). An elastic washer (12) is provided between the upward flanging (311) and the bottom plate (33).

5. The outer rotor motor according to claim 4, wherein: A step (44) is provided in the middle of the bearing sleeve seat (4). The step (44) abuts against the top end of the second bearing (7), and the bottom end of the second bearing (7) is pressed by the second washer (13). The second washer (13) is installed at the bottom of the second bearing seat (331).

6. The external rotor motor according to claim 4, wherein: External threads are provided on the outer periphery of the bottom of the bearing sleeve seat (4), and a mounting seat (200) is installed. A threaded hole (201) is provided in the middle of the mounting seat (200). The bottom of the bearing sleeve seat (4) is inserted into the threaded hole (201) to form a threaded connection. A plurality of mounting holes (202) are provided on the mounting seat (200) around the threaded hole (201) to facilitate load connection.

7. The external rotor motor according to claim 4, characterized in that: A first convex ring (332) and a second convex ring (333) are axially provided on the bottom surface of the bottom end plate (33). The first convex ring (332) is located outside the second convex ring (333), and the second convex ring (333) is located around the through hole (330). A second groove (334) is formed between the first convex ring (332) and the second convex ring (333). A convex platform (203) protrudes axially upward from the edge of the mounting seat (200). The convex platform (203) is nested in the second groove (334) to form a labyrinth seal structure.

8. A blower, comprising an outer rotor motor and a wind wheel, characterized in that: The external rotor motor described above uses the external rotor motor according to any one of claims 1 to 7.

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