External rotor motor

Abstract

An external rotor motor comprises a single motor and a controller. The single motor comprises a stator assembly, a rotor assembly, a rotating shaft and a bearing seat; the bearing seat comprises an end plate and a sleeve protruding from the middle of the inner side surface of the end plate; the stator assembly is fitted over the sleeve; the rotor assembly is fitted over the stator assembly; the rotating shaft is connected to the rotor assembly; the controller is mounted on the end plate, and comprises a control box having a closed cavity and a breather; a through hole is formed on the control box; and the breather fits into the through hole so as to be mounted on the control box. Arranging the breather on the control box ensures consistent air pressure inside and outside the controller, so as to block external moisture, and prevent the generation of condensate water inside the controller, thereby solving the technical problems of short circuit and burnout of components on a control board caused by condensate water.

Description

An external rotor motor Technical Field

[0001] This utility model relates to an external rotor motor. Background Technology

[0002] As shown in Figure 1, the existing external rotor motor includes a motor unit 1a and a controller 2a. The motor unit 1a includes a stator assembly 11a, a rotor assembly 12a, a shaft 13a, and a bearing housing 14a. The bearing housing 14a includes an end plate 141a and a sleeve 142a protruding from the middle of the end plate 141a. The stator assembly 11a is fitted outside the sleeve 142a, and the rotor assembly 12a is fitted outside the stator assembly 11a. The shaft 13a is connected to the rotor assembly 12a. A bearing is installed inside the sleeve 142a, supporting the shaft 13a. The controller 2a is mounted on the end plate 141a. The inner cavity of the controller 2a is connected to the bearing housing 14a. The control board is located at the bottom of the inner cavity of the controller 2a. Condensate and moisture from outside the motor will condense on the control board when they enter the inner cavity of the controller 2a, causing short circuits and burnout of the components on the control board.

[0003] Utility Model Content

[0004] This utility model provides an external rotor motor to solve the technical problem in the prior art where condensate generated by the external rotor motor and water vapor from outside the motor enter the controller cavity and condense on the control board, causing short circuits and burn-out of components on the control board.

[0005] The technical solution of this utility model is implemented as follows:

[0006] The purpose of this utility model is to provide an external rotor motor, including a motor unit and a controller. The motor unit includes a stator assembly, a rotor assembly, a shaft, and a bearing housing. The bearing housing includes an end plate and a sleeve protruding from the center of the inner side of the end plate. The stator assembly is fitted outside the sleeve, and the rotor assembly is fitted outside the stator assembly. The shaft is connected to the rotor assembly. The controller is mounted on the end plate. The controller includes a control box with a closed cavity and a breather. The control box has a through hole, and the breather is mounted on the control box by cooperating with the through hole.

[0007] The control box described above includes a bottom, a cylindrical section, and an end cap. The bottom and the end cap are respectively located at both ends of the cylindrical section. The bottom and the cylindrical section are an integral structure. The end cap is installed at one end of the cylindrical section. The through hole is located on the end cap. The respirator is installed on the end cap by cooperating with the through hole.

[0008] The outer edge of the inner side of the end cap described above has an outer ring and an inner ring protruding from it. An annular groove that mates with the cylindrical part is formed between the outer ring and the inner ring. The height of the inner ring is not equal.

[0009] The outer side of the end cap described above is marked with lead wires.

[0010] The aforementioned lead-out marking is a boss marking.

[0011] The outer side of the end cap described above is provided with a clamping boss.

[0012] The outer edge of the end of the cylindrical part that mates with the end cap is provided with a reinforcing rib.

[0013] A drain outlet is provided at the top of the aforementioned sleeve.

[0014] Two drain ports are symmetrically provided at the top of the sleeve described above.

[0015] Several countersunk holes are provided on the outer surface of the end plate, near the position corresponding to the sleeve.

[0016] A plurality of heat dissipation ribs and motor mounting positions are respectively provided on the inner and outer sides of the end plate. The heat dissipation ribs and motor mounting positions are distributed along the outer circumference of the end plate, and the outer edge of the end plate protrudes from the outer end face of the motor mounting position and the outer end of the heat dissipation ribs.

[0017] The bottom of the aforementioned controller has several controller mounting positions protruding. The controller is mounted on the end plate by matching the controller mounting positions with the motor mounting positions. The heat dissipation fins and the control box do not contact each other.

[0018] The controller described above also includes a cable sheath assembly, which includes a seal and a sheath. The seal has a lead hole and a recess, and the bottom of the controller has a cable passage hole. An annular boss protrudes from the periphery of the cable passage hole, and the sheath is installed in the cable passage hole. The seal is installed and pressed against the sheath by the recess and the annular boss.

[0019] The aforementioned recess and the annular protrusion, when combined, form a water-blocking labyrinth.

[0020] Compared with the prior art, this utility model has the following advantages:

[0021] 1. An external rotor motor, comprising a motor unit and a controller, wherein the motor unit includes a stator assembly, a rotor assembly, a shaft, and a bearing housing, the bearing housing including an end plate and a sleeve protruding from the center of the inner side of the end plate, the stator assembly being fitted over the sleeve, the rotor assembly being fitted over the stator assembly, the shaft being connected to the rotor assembly, the controller being mounted on the end plate, the controller including a control box with a closed cavity and a breather, the control box having a through hole, the breather being mounted on the control box by engaging with the through hole. In this embodiment, the breather on the control box ensures uniform air pressure inside and outside the controller, blocking external moisture and preventing condensation inside the controller, thus solving the technical problem of short circuits and burn-out of components on the control board due to condensation.

[0022] 2. Other advantages of this utility model are described in detail in the embodiments section. Attached Figure Description

[0023] Figure 1 is a schematic diagram of the structure of an external rotor motor provided by the prior art;

[0024] Figure 2 is a perspective view of the external rotor motor provided in an embodiment of this utility model;

[0025] Figure 3 is an exploded view of the external rotor motor provided in the embodiment of this utility model;

[0026] Figure 4 is a front view of the external rotor motor provided in an embodiment of this utility model;

[0027] Figure 5 is a cross-sectional view of Figure 4 (AA section);

[0028] Figure 6 is an exploded view of the controller 2 provided in the embodiment of this utility model;

[0029] Figure 7 is an exploded view of the controller 2 provided in an embodiment of the present invention from another angle;

[0030] Figure 8 is an exploded view of the single motor 1 provided in the embodiment of this utility model;

[0031] Figure 9 is an exploded view of the motor unit 1 provided in an embodiment of this utility model from another angle;

[0032] Figure 10 is a schematic diagram of the external rotor motor provided in an embodiment of the present invention;

[0033] Figure 11 is a magnified view of part B in Figure 10. Detailed Implementation

[0034] 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 embodiments of this utility model, not all embodiments. 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.

[0035] Example:

[0036] As shown in Figures 2 to 9, this embodiment provides an external rotor motor, including a motor unit 1 and a controller 2. The motor unit 1 includes a stator assembly 11, a rotor assembly 12, a shaft 13, and a bearing housing 14. The bearing housing 14 includes an end plate 141 and a sleeve 142 protruding from the center of the inner side of the end plate 141. The stator assembly 11 is fitted onto the sleeve 142, and the rotor assembly 12 is fitted onto the stator assembly 11. The shaft 13 is connected to the rotor assembly 12. The controller 2 is mounted on the end plate 141. The controller 2 includes a control box 21 with a closed cavity 22 and a breather 23. The control box 21 has a through hole 24, and the breather 23 is mounted on the control box 21 by cooperating with the through hole 24. The breather 23 can make the air pressure inside and outside the controller 2 the same, which not only blocks external moisture but also prevents condensation from forming inside the controller 2, solving the technical problem of short circuits and burn-out of components on the control board due to condensation.

[0037] As shown in Figures 6 and 7, preferably, the control box 21 includes a bottom 211, a cylindrical part 212, and an end cap 213. The bottom 211 and the end cap 213 are respectively disposed at both ends of the cylindrical part 212. The bottom 211 and the cylindrical part 212 are an integral structure. The end cap 213 is installed at one end of the cylindrical part 212. The through hole 24 is disposed on the end cap 213. The respirator 23 is installed on the end cap 213 by cooperating with the through hole 24, which facilitates the installation of the respirator 23.

[0038] As shown in Figure 7, specifically, the outer edge of the inner side of the end cap 213 has an outer ring 2131 and an inner ring 2132 protruding. An annular groove that mates with the cylindrical part 212 is formed between the outer ring 2131 and the inner ring 2132. The height of the inner ring 2132 is not equal. This allows the inner ring 2132 to be set at a relatively high point in the corresponding control box 21 where there are no components, and at a relatively low point in the corresponding control box 21 where there are components. This facilitates assembly and prevents mistakes.

[0039] As shown in Figure 8, specifically, a lead wire mark 2133 is provided on the outer side of the end cap 213. Preferably, the lead wire mark 2133 is set as a raised mark, or it can be set as a recessed mark. The purpose of this setting is to facilitate visual positioning by employees during installation.

[0040] Specifically, a clamping boss 2134 is provided on the outer side of the end cover 213 for clamping and positioning during machining.

[0041] Specifically, a reinforcing rib 2121 is provided on the outer edge of the end of the cylinder 212 that mates with the end cap 213, which can both ensure the sealing area of ​​the cylinder 212 and the end cap 213 and improve the strength of the controller 2.

[0042] Specifically, a drain port 1421 is provided at the top end of the sleeve 142 to prevent condensate from accumulating on the bearing and subsequently flowing into the bearing and corroding it. Preferably, two drain ports 1421 are symmetrically provided at the top end of the sleeve 142 for better drainage.

[0043] As shown in Figures 8 and 9, specifically, a number of countersunk holes 1411 are provided on the outer side of the end plate 141, near the position corresponding to the sleeve 142. When the temperature of the motor 1 and the controller 2 rises, the countersunk holes 1411 can be turned into through holes to facilitate water inlet and heat dissipation.

[0044] Specifically, a plurality of heat dissipation ribs 143 and motor mounting positions 144 are respectively provided on the inner and outer surfaces of the end plate 141. The heat dissipation ribs 143 and motor mounting positions 144 are distributed along the outer circumference of the end plate 141, and the outer edge 1412 of the end plate 141 protrudes beyond the outer end face 1441 of the motor mounting position 144 and the outer end 1431 of the heat dissipation ribs 143. This arrangement facilitates the cleaning of die-casting burrs and avoids damage to the clamping and positioning surfaces, ensuring the accuracy of the bearing seat (14) clamping and positioning. Preferably, four motor mounting positions 144 are provided on the inner and outer surfaces of the end plate 141.

[0045] Specifically, the bottom 211 of the controller 2 has several controller mounting positions 2111 protruding from it. Preferably, four controller mounting positions 2111 are provided on the bottom 211 of the controller 2. The controller 2 is mounted onto the end plate 141 by matching the controller mounting positions 2111 with the motor mounting positions 144. Preferably, the controller 2 is mounted onto the end plate 141 by screws or bolts in cooperation with the controller mounting positions 2111 and the motor mounting positions 144. The heat dissipation fins 143 and the control box 21 do not contact each other. This arrangement can prevent the heat generated by the motor 1 from being conducted to the controller 2, thereby improving the lifespan of the controller 2.

[0046] As shown in Figures 10 and 11, specifically, the controller 2 further includes a cable sheath assembly 25, which includes a seal 251 and a sheath 252. The seal 251 has a lead hole 2511 and a recess 2512. The bottom 211 of the controller 2 has a wire passage hole, and an annular boss 2111 protrudes from the periphery of the wire passage hole. The sheath 252 is installed in the wire passage hole. The seal 251 is installed and pressed against the sheath 252 by the recess 2512 cooperating with the annular boss 2111. The motor lead wire is connected to the control board of the controller 2 through the lead hole 2511 of the seal 251 and the sheath 252. The motor lead wire passes through the end plate 141 of the bearing housing 14, through the lead hole 2511 and the sheath 252, and enters the control box to connect with the control board.

[0047] Specifically, the recess 2512 and the annular protrusion 2111 cooperate to form a water-blocking labyrinth to prevent external water from entering the controller.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An external rotor motor, comprising a motor unit (1) and a controller (2), wherein the motor unit (1) comprises a stator assembly (11), a rotor assembly (12), a rotating shaft (13), and a bearing housing (14), wherein the bearing housing (14) comprises an end plate (141) and a sleeve (142) protruding from the center of the inner side of the end plate (141), the stator assembly (11) is fitted outside the sleeve (142), the rotor assembly (12) is fitted outside the stator assembly (11), the rotating shaft (13) is connected to the rotor assembly (12), and the controller (2) is mounted on the end plate (141), characterized in that: The controller (2) includes a control box (21) with a closed cavity (22) and a respirator (23). The control box (21) has a through hole (24), and the respirator (23) is installed on the control box (21) by cooperating with the through hole (24).

2. An external rotor motor according to claim 1, characterized in that: The control box (21) includes a bottom (211), a cylindrical part (212), and an end cap (213). The bottom (211) and the end cap (213) are respectively disposed at both ends of the cylindrical part (212). The bottom (211) and the cylindrical part (212) are integral structures. The end cap (213) is installed at one end of the cylindrical part (212). The through hole (24) is disposed on the end cap (213). The respirator (23) is installed on the end cap (213) by cooperating with the through hole (24).

3. An external rotor motor according to claim 2, characterized in that: The outer edge of the inner side of the end cap (213) has an outer ring (2131) and an inner ring (2132) protruding out. An annular groove that fits with the cylindrical part (212) is formed between the outer ring (2131) and the inner ring (2132). The height of the inner ring (2132) is not equal.

4. An external rotor motor according to claim 2, characterized in that: The outer side of the end cap (213) is provided with lead wire markings (2133).

5. An external rotor motor according to claim 4, characterized in that: The lead-out mark (2133) is a boss mark.

6. An external rotor motor according to claim 2, characterized in that: The outer side of the end cap (213) is provided with a clamping boss (2134).

7. An external rotor motor according to claim 3, characterized in that: The outer edge of the end of the cylindrical part (212) that mates with the end cap (213) is provided with a reinforcing rib (2121).

8. An external rotor motor according to any one of claims 1 to 7, characterized in that: A drain outlet (1421) is provided at the top of the sleeve (142).

9. An external rotor motor according to claim 8, characterized in that: Two drain ports (1421) are symmetrically provided at the top of the sleeve (142).

10. An external rotor motor according to any one of claims 1 to 7, characterized in that: On the outer side of the end plate (141), near the position corresponding to the sleeve (142), there are several countersunk holes (1411).

11. An external rotor motor according to any one of claims 1 to 7, characterized in that: A plurality of heat dissipation ribs (143) and motor mounting positions (144) are respectively provided on the inner and outer sides of the end plate (141). The heat dissipation ribs (143) and motor mounting positions (144) are distributed along the outer circumferential direction of the end plate (141). The outer edge (1412) of the end plate (141) protrudes from the outer end face (1441) of the motor mounting position (144) and the outer end (1431) of the heat dissipation ribs (143).

12. An external rotor motor according to claim 11, characterized in that: The bottom (211) of the controller (2) has several controller mounting positions (2111) protruding out. The controller (2) is installed on the end plate (141) by matching the controller mounting positions (2111) with the motor mounting positions (144). The heat dissipation fins (143) and the control box (21) do not contact each other.

13. An external rotor motor according to any one of claims 2 to 7, characterized in that: The controller (2) also includes a cable sheath assembly (25), which includes a seal (251) and a sheath (252). The seal (251) is provided with a lead hole (2511) and a recess (2512). The bottom (211) of the controller (2) is provided with a wire passage hole. An annular boss (2111) protrudes from the periphery of the wire passage hole. The sheath (252) is installed in the wire passage hole. The seal (251) is installed and pressed against the sheath (252) by cooperating with the annular boss (2111) through the recess (2512).

14. An external rotor motor according to claim 13, characterized in that: The recess (2512) and the annular protrusion (2111) together form a water-blocking labyrinth.

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