External rotor motor

Abstract

The utility model relates to an external rotor motor. The external rotor motor comprises a stator assembly, a control cover and an external rotor assembly. The stator assembly comprises a stator main body, and a first bearing and a second bearing which are respectively arranged at two ends of the stator main body; the control cover comprises a cover plate with a mounting cavity and a control circuit board arranged in the mounting cavity, the cover plate is arranged at one end of the stator main body, and the control circuit board is electrically connected with the stator main body; the outer rotor assembly comprises a rotor shell and a rotor body arranged in the rotor shell, the rotor body is movably arranged on the peripheral side of the stator body in a sleeving mode, and the two ends of the rotor shell are arranged on the first bearing and the second bearing respectively. According to the utility model, the technical problems of large size, complex structure and relatively poor heat dissipation performance of the external rotor motor in the prior art can be solved.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to an external rotor motor. Background Technology

[0002] The stator of an external rotor motor is fixed inside, while the external rotor rotates around the stator, forming a radial air gap flux structure. It has a small axial dimension and high power-to-weight ratio, making it suitable for space-constrained applications such as axial fans, cooling systems, electric vehicles, drones, and robots. In traditional technology, external rotor motors typically have a central shaft, with the stator fixed on it, while the external rotor is usually rotatably mounted on the central shaft via two bearings. This structure results in a larger, more complex external rotor motor and is less conducive to heat dissipation. Utility Model Content

[0003] This invention provides an external rotor motor that solves the technical problems of large size, complex structure, and relatively poor heat dissipation of traditional external rotor motors.

[0004] To solve the above-mentioned technical problems, this utility model provides an external rotor motor, comprising:

[0005] A stator assembly includes a stator body and a first bearing and a second bearing respectively disposed at both ends of the stator body;

[0006] A control cover includes a cover plate having a mounting cavity, and a control circuit board disposed in the mounting cavity. The cover plate is mounted on one end of the stator body, and the control circuit board is electrically connected to the stator body.

[0007] The outer rotor assembly includes a rotor housing and a rotor body disposed within the rotor housing. The rotor body is movably sleeved on the outer periphery of the stator body. The two ends of the rotor housing are respectively disposed on the first bearing and the second bearing.

[0008] Optionally, the stator body has a stator shaft hole, and the first bearing is disposed on the inner wall surface of one end of the stator shaft hole;

[0009] The second bearing is disposed on the outer peripheral surface of one end of the stator body.

[0010] Optionally, the rotor housing includes a housing cylinder sleeved on the rotor body and a housing end cap disposed at the open end of the housing cylinder. A portion of the housing end cap extends into the stator shaft hole and passes through the first bearing, while the other end of the housing cylinder is sleeved on the second bearing.

[0011] Optionally, the outer casing end cap includes an end cap body detachably connected to the open end of the outer casing cylinder, and an end cap shaft protruding from the inner side of the end cap body, the end cap shaft extending into the stator shaft hole and passing through the first bearing.

[0012] Optionally, the end cap shaft includes a first limiting shaft section, a bearing mounting shaft section, and a second limiting shaft section that are sequentially protruding from the inner side of the end cap body. An annular limiting baffle is sleeved at the first limiting shaft section, the first bearing is sleeved at the bearing mounting shaft section, and an end cap limiting ring is sleeved at the second limiting shaft section. The first bearing is limited between the annular limiting baffle and the end cap limiting ring.

[0013] Optionally, the outer diameters of the first limiting shaft segment, the bearing mounting shaft segment, and the second limiting shaft segment are sequentially reduced.

[0014] The stator shaft hole has a bearing mounting hole, a first limiting hole, and a second limiting hole arranged in sequence with gradually decreasing inner diameters. The first bearing passes through the bearing mounting hole, the end cap limiting ring passes through the first limiting hole, and the side wall of the second limiting hole blocks the inner side of the end cap limiting ring.

[0015] Optionally, one end of the outer casing is provided with an annular end plate away from the open end, and the periphery of the central hole of the annular end plate has an end plate protrusion extending axially into the cavity of the outer casing, and the end plate protrusion is provided on the second bearing.

[0016] Optionally, one end of the stator body is provided with a stator connecting end, which passes through the second bearing, and the end face of the stator connecting end is detachably connected to the cover plate.

[0017] Optionally, the outer diameter of the stator connection end is smaller than the outer diameter of the stator body, the inner diameter of the end plate protrusion ring is larger than the diameter of the central hole of the annular end plate, and the second bearing is located between the outer end face of the stator body and the inner wall surface of the annular end plate.

[0018] Optionally, the annular end plate can be detachably disposed at the end of the outer casing.

[0019] The beneficial effects of the technical solution provided by this utility model include:

[0020] The stator assembly's stator body is rotatably connected to the rotor housing of the outer rotor assembly via the first and second bearings at both ends. A control circuit board within the control cover energizes the stator body, causing it to drive the rotor and rotor housing to rotate around it. This eliminates the need for a central shaft on the stator body, reducing the number of components in the outer rotor motor and allowing for a more compact design of the stator and outer rotor assemblies. This simplifies the motor structure, reduces its size, and improves heat dissipation due to the absence of a central shaft. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional cross-sectional view of the external rotor motor described in this embodiment of the utility model. Figure 1 ;

[0023] Figure 2 This is a three-dimensional cross-sectional view of the external rotor motor described in this embodiment of the utility model. Figure 2 ;

[0024] Figure 3 for Figure 1 Front view structural diagram;

[0025] Figure 4 This is a schematic diagram of the dissected structure of the external rotor motor described in this embodiment of the present invention;

[0026] Figure 5 for Figure 4 Front view structural diagram;

[0027] Figure 6 This is a partial anatomical view of the stator assembly and outer rotor assembly of the external rotor motor described in this embodiment of the invention. Figure 1 ;

[0028] Figure 7 for Figure 6 Front view structural diagram;

[0029] Figure 8 This is a partial anatomical view of the stator assembly and outer rotor assembly of the external rotor motor described in this embodiment of the invention. Figure 2 ;

[0030] Figure 9 for Figure 8 Front view structural diagram;

[0031] Figure 10 This is a schematic diagram showing the dissection of the stator assembly of the external rotor motor according to an embodiment of the present invention;

[0032] Figure 11 for Figure 10 Front view structural diagram;

[0033] Figure 12 This is an exploded structural diagram of the external rotor motor described in an embodiment of the present invention.

[0034] In the diagram: 10, external rotor motor; 100, stator assembly; 110, stator body; 112, stator shaft hole; 1122, bearing mounting hole; 1124, first limiting hole; 1126, second limiting hole; 114, stator connection end; 116, stator core; 118, stator winding; 120, first bearing; 130, second bearing; 200, control cover; 210, cover plate; 220, control circuit board; 300. Outer rotor assembly; 310. Rotor housing; 312. Housing cylinder; 313. Annular end plate; 3132. End plate protrusion ring; 314. Housing end cover; 3142. End cover body; 3144. End cover shaft; 31442. First limiting shaft section; 31444. Bearing mounting shaft section; 31446. Second limiting shaft section; 316. Annular limiting baffle; 318. End cover limiting ring; 320. Rotor body. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0036] like Figures 1 to 5 As shown, this utility model proposes an external rotor motor 10, including a stator assembly 100, a control cover 200 disposed at one end of the stator assembly 100, and an external rotor assembly 300 rotatably disposed outside the stator assembly 100. The stator assembly 100 can be controlled to operate through the control cover 200, so that the stator assembly 100 drives the external rotor assembly 300 to rotate around the stator assembly 100, thereby causing the external rotor assembly 300 to drive other structures to rotate and operate.

[0037] Furthermore, the stator assembly 100 may include a stator body 110, and a first bearing 120 and a second bearing 130 respectively disposed at both ends of the stator body 110. The outer rotor assembly 300 may include a rotor housing 310 and a rotor body 320 disposed within the rotor housing 310. The rotor body 320 is movably sleeved on the outer periphery of the stator body 110, and both ends of the rotor housing 310 are respectively disposed on the first bearing 120 and the second bearing 130. The control cover 200 may include a cover plate 210 having a mounting cavity, and a control circuit board 220 disposed within the mounting cavity. The cover plate 210 is mounted on one end of the stator body 110, and the control circuit board 220 is electrically connected to the stator body 110.

[0038] The stator assembly 100 can be rotatably connected to the rotor housing 310 of the outer rotor assembly 300 via the first bearing 120 and the second bearing 130 at both ends of the stator body 110. Furthermore, the stator body 110 is energized via the control circuit board 220 located in the control cover 200, causing the stator body 110 to drive the rotor body 320 and rotor housing 310 to rotate around the stator body 110. This eliminates the need for a central shaft on the stator body 110, allowing the outer rotor assembly 300 to rotate around it. This reduces the number of components in the outer rotor motor 10, allowing for a more compact design of the stator assembly 100 and outer rotor assembly 300, simplifying the motor structure and reducing its size. Moreover, the absence of a central shaft improves the motor's heat dissipation.

[0039] Furthermore, such as Figures 1 to 5 As shown, in this embodiment, the stator body 110 of the stator assembly 100 has a stator shaft hole 112. The first bearing 120 can be disposed on the inner wall surface of one end of the stator shaft hole 112; the second bearing 130 can be disposed on the outer peripheral surface of one end of the stator body 110. The first bearing 120 can be disposed inside one end of the stator body 110 (in the stator shaft hole 112), and the second bearing 130 can be disposed outside the other end of the stator body 110. One end of the rotor housing 310 of the outer rotor assembly 300 can extend into one end of the stator shaft hole 112 of the stator body 110 and be sleeved with the first bearing 120. The other end of the rotor housing 310 can surround the other end of the stator body 110 and be sleeved with the second bearing 130, thereby allowing both ends of the rotor housing 310 to be rotatably disposed at both ends of the stator body 110. Furthermore, the stator shaft hole 112 provided on the stator body 110 also facilitates heat dissipation of the stator assembly 100. Additionally, such as Figures 10 to 11 As shown, the stator body 110 may include a stator core 116, a stator winding 118 disposed on the outer periphery of the stator core 116, a stator shaft hole 112 disposed on the stator core 116, a first bearing 120 disposed in the stator shaft hole 112 of the stator core 116, and a second bearing 130 disposed at the end of the stator core 116.

[0040] In other embodiments, the stator body 110 of the stator assembly 100 has a stator shaft hole 112. A first bearing 120 can be disposed on the inner wall surface of one end of the stator shaft hole 112, and a second bearing 130 can be disposed on the inner wall surface of the other end of the stator shaft hole 112. The first bearing 120 and the second bearing 130 can be respectively disposed inside the two ends of the stator body 110 (in the stator shaft hole 112), allowing the two ends of the rotor housing 310 of the outer rotor assembly 300 to respectively extend into the two ends of the stator shaft hole 112 of the stator body 110 and respectively engage with the first bearing 120 and the second bearing 130, so that the two ends of the rotor housing 310 are rotatably disposed at the two ends of the stator body 110.

[0041] Furthermore, in some other embodiments, the stator body 110 of the stator assembly 100 has a stator shaft hole 112, a first bearing 120 can be disposed on the outer peripheral surface of one end of the stator body 110, and a second bearing 130 can be disposed on the outer peripheral surface of the other end of the stator body 110. This allows the first bearing 120 and the second bearing 130 to be respectively disposed outside both ends of the stator body 110, and allows both ends of the rotor housing 310 of the outer rotor assembly 300 to be respectively positioned around both ends of the stator body 110 and respectively sleeved with the first bearing 120 and the second bearing 130, so that both ends of the rotor housing 310 are rotatably disposed at both ends of the stator body 110.

[0042] Moreover, such as Figures 4 to 9 As shown, the rotor housing 310 may include a housing cylinder 312 sleeved on the rotor body 320, and a housing end cap 314 disposed at the open end of the housing cylinder 312. The housing end cap 314 is disposed on the first bearing 120, and the other end of the housing cylinder 312 is disposed on the second bearing 130. By making the rotor housing 310 a detachably connected housing cylinder 312 and housing end cap 314, it is convenient to install the stator assembly 100 and the rotor body 320 in the rotor housing 310. Moreover, the housing cylinder 312 may be a cylindrical structure with one end closed or semi-closed and the other end open, and the housing end cap 314 may be detachably connected to the open end of the housing cylinder 312.

[0043] Furthermore, when one end of the rotor housing 310 extends into the stator shaft hole 112 of the stator body 110 and the other end surrounds the stator body 110, a portion of the structure of the outer casing end cap 314 of the rotor housing 310 can extend into the stator shaft hole 112 of the stator body 110 and pass through the first bearing 120 at the end of the stator shaft hole 112. Moreover, the other end of the outer casing cylinder 312 of the rotor housing 310 can be sleeved on the second bearing 130 on the outer circumferential surface of the stator body 110. Thus, one end of the stator body 110 is rotatably connected to the outer casing end cap 314 through the first bearing 120, and the other end of the stator body 110 is rotatably connected to the outer casing cylinder 312 through the second bearing 130, thereby realizing the rotatable connection between the stator assembly 100 and the outer rotor assembly 300.

[0044] Furthermore, the outer casing end cap 314 may include an end cap body 3142 detachably connected to the open end of the outer casing cylinder 312, and an end cap shaft 3144 protruding from the inner side of the end cap body 3142 (the side closest to the stator body 110). The end cap shaft 3144 extends into the stator shaft hole 112 and passes through the first bearing 120. The end cap body 3142 of the outer casing end cap 314 can be detachably connected (e.g., bolted) to the end face of the open end of the outer casing cylinder 312, facilitating the installation and removal of the outer casing end cap 314. Moreover, the end cap shaft 3144 protruding from the side of the end cap body 3142 facilitates engagement with the first bearing 120 in the stator shaft hole 112 of the stator body 110, allowing the outer casing end cap 314 to be rotatably connected to one end of the stator assembly 100 via the end cap shaft 3144.

[0045] Furthermore, the end cap shaft 3144 may include a first limiting shaft section 31442, a bearing mounting shaft section 31444, and a second limiting shaft section 31446 that are sequentially protruding from the inner side of the end cap body 3142. An annular limiting baffle 316 is sleeved at the first limiting shaft section 31442, a first bearing 120 is sleeved at the bearing mounting shaft section 31444, and an end cap limiting ring 318 is sleeved at the second limiting shaft section 31446. The first bearing 120 is limited between the annular limiting baffle 316 and the end cap limiting ring 318. By sleeved the first bearing 120 in the stator shaft hole 112 of the stator body 110 onto the bearing mounting shaft section 31444 of the end cover shaft 3144, the first bearing 120 can be limited from both sides by the annular limiting baffle 316 at the first limiting shaft section 31442 and the end cover limiting ring 318 at the second limiting shaft section 31446, so that the connection between the first bearing 120 and the end cover shaft 3144 and the stator body 110 is more stable and reliable.

[0046] Furthermore, the end cap shaft 3144 is configured with a first limiting shaft segment 31442, a bearing mounting shaft segment 31444, and a second limiting shaft segment 31446. By setting the end cap shaft 3144 as a stepped shaft with at least three segments whose outer diameter decreases sequentially, it not only facilitates the assembly of the annular limiting baffle 316, the first bearing 120, and the end cap limiting ring 318, but also allows the first bearing 120 to be further limited by the shoulder of the stepped shaft.

[0047] Furthermore, correspondingly, the stator shaft hole 112 of the stator body 110 may have a bearing mounting hole 1122, a first limiting hole 1124, and a second limiting hole 1126 with gradually decreasing inner diameters arranged sequentially. The first bearing 120 passes through the bearing mounting hole 1122, and the annular limiting baffle 316 can be blocked outside the end face of the bearing mounting hole 1122. The end cap limiting ring 318 can pass through the first limiting hole 1124, and the side wall of the second limiting hole 1126 can be blocked on the inner side of the end cap limiting ring 318. Thus, the stator shaft hole 112 can be correspondingly set as a stepped hole, which not only facilitates the fit with the end cap shaft 3144 of the stepped shaft structure, but also facilitates the radial and axial limiting of the annular limiting baffle 316, the first bearing 120, and the end cap limiting ring 318.

[0048] Furthermore, one end of the outer casing 312 is provided with an annular end plate 313 away from the open end. The annular end plate 313 has a central hole, through which the second bearing 130 can be inserted, thereby enabling a rotatable connection between the annular end plate 313 of the outer casing 312 and the stator body 110. Moreover, the end face of one end of the stator body 110 can be located at the central hole of the annular end plate 313, facilitating the installation of the cover plate 210 of the control cover 200 on the end face of the stator body 110.

[0049] Furthermore, the annular end plate 313 has an end plate protrusion 3132 extending axially into the cavity of the outer casing 312 around the central hole of the annular end plate 313. This end plate protrusion 3132 can be sleeved on the second bearing 130. By providing a protruding end plate protrusion 3132 at the central hole of the annular end plate 313, the installation space can be increased to facilitate the connection with the second bearing 130. Correspondingly, one end of the stator body 110 can be provided with a stator connecting end 114 protruding out. The stator connecting end 114 can pass through the second bearing 130, and the end face of the stator connecting end 114 can be detachably connected to the cover plate 210 of the control cover 200. By providing a protruding stator connecting end 114 at the end of the stator body 110, it is convenient to sleeve the stator connecting end 114 with the second bearing 130 and to cooperate with the end plate protrusion 3132 at the central hole of the annular end plate 313. In addition, by placing the end plate protrusion ring 3132 inside the central hole (i.e., in the cavity of the outer casing 312), its space occupation can be reduced, and the second bearing 130 can be conveniently limited.

[0050] Furthermore, the outer diameter of the stator connecting end 114 can be smaller than the outer diameter of the stator body 110, and the inner diameter of the end plate protrusion ring 3132 can be larger than the diameter of the central hole of the annular end plate 313. This allows the second bearing 130 to be confined between the outer end face of the stator body 110 and the inner wall surface of the annular end plate 313. By making the outer diameter of the stator connecting end 114 smaller than the outer diameter of the stator body 110, the second bearing 130 fitted onto the stator connecting end 114 can be confined from one side by the end face of the stator body 110. Similarly, by making the inner diameter of the end plate protrusion ring 3132 larger than the diameter of the central hole of the annular end plate 313, the second bearing 130 passing through the annular end plate 313 can be confined from the other side by the inner wall surface of the central hole. This ensures that the second bearing 130 is confined between the end face of the stator body 110 and the inner wall surface of the annular end plate 313, making the second bearing 130 stable and reliable.

[0051] In addition, such as Figure 12 As shown, the annular end plate 313 can also be detachably disposed at the end of the outer casing 312. That is, the outer casing 312 may include a main cylinder with open ends, and an annular end plate 313 detachably disposed at one end of the main cylinder, and an outer casing end cap 314 detachably disposed at the other end of the main cylinder. This makes it easier to assemble and maintain the motor.

[0052] It should be noted that in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0053] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features of the present invention.

Claims

1. An external rotor motor, characterized in that, include: A stator assembly includes a stator body and a first bearing and a second bearing respectively disposed at both ends of the stator body; A control cover includes a cover plate having a mounting cavity and a control circuit board disposed in the mounting cavity. The cover plate is mounted on one end of the stator body, and the control circuit board is electrically connected to the stator body. as well as, The outer rotor assembly includes a rotor housing and a rotor body disposed within the rotor housing. The rotor body is movably sleeved on the outer periphery of the stator body. The two ends of the rotor housing are respectively disposed on the first bearing and the second bearing.

2. The external rotor motor according to claim 1, characterized in that, The stator body has a stator shaft hole, and the first bearing is disposed on the inner wall surface of one end of the stator shaft hole; The second bearing is disposed on the outer peripheral surface of one end of the stator body.

3. The external rotor motor according to claim 2, characterized in that, The rotor housing includes a housing cylinder sleeved on the rotor body and a housing end cap located at the open end of the housing cylinder. A portion of the housing end cap extends into the stator shaft hole and passes through the first bearing. The other end of the housing cylinder is sleeved on the second bearing.

4. The external rotor motor according to claim 3, characterized in that, The outer casing end cap includes an end cap body detachably connected to the open end of the outer casing cylinder, and an end cap shaft protruding from the inner side of the end cap body. The end cap shaft extends into the stator shaft hole and passes through the first bearing.

5. The external rotor motor according to claim 4, characterized in that, The end cap shaft includes a first limiting shaft section, a bearing mounting shaft section, and a second limiting shaft section that are sequentially protruding from the inner side of the end cap body. An annular limiting baffle is sleeved on the first limiting shaft section, the first bearing is sleeved on the bearing mounting shaft section, and an end cap limiting ring is sleeved on the second limiting shaft section. The first bearing is limited between the annular limiting baffle and the end cap limiting ring.

6. The external rotor motor according to claim 5, characterized in that, The outer diameters of the first limiting shaft section, the bearing mounting shaft section, and the second limiting shaft section are sequentially reduced. The stator shaft hole has a bearing mounting hole, a first limiting hole, and a second limiting hole arranged in sequence with gradually decreasing inner diameters. The first bearing passes through the bearing mounting hole, the end cap limiting ring passes through the first limiting hole, and the side wall of the second limiting hole blocks the inner side of the end cap limiting ring.

7. The external rotor motor according to any one of claims 3-6, characterized in that, One end of the outer shell is provided with an annular end plate away from the open end. The periphery of the central hole of the annular end plate has an end plate protrusion ring extending axially into the cavity of the outer shell. The end plate protrusion ring is disposed on the second bearing.

8. The external rotor motor according to claim 7, characterized in that, One end of the stator body protrudes to form a stator connection end, which passes through the second bearing, and the end face of the stator connection end is detachably connected to the cover plate.

9. The external rotor motor according to claim 8, characterized in that, The outer diameter of the stator connection end is smaller than the outer diameter of the stator body, the inner diameter of the end plate protrusion ring is larger than the diameter of the central hole of the annular end plate, and the second bearing is located between the outer end face of the stator body and the inner wall face of the annular end plate.

10. The external rotor motor according to claim 7, characterized in that, The annular end plate is detachably mounted at the end of the outer casing.

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