Motor end cover assembly and external rotor motor using same

Abstract

The utility model discloses a motor end cap assembly and an external rotor motor applying the same, the motor end cap assembly comprises an end cap body and a circuit board assembly, the end cap body is provided with a groove, the circuit board assembly is installed in the groove, the circuit board assembly comprises an insulating seat and a control circuit board, the insulating seat is provided with a cavity, and the control circuit board is installed in the cavity. A cavity is formed in the end cover body, the control circuit board is installed in the cavity, the cavity is filled with an encapsulation material, the encapsulation material forms an encapsulation body covering the control circuit board, the encapsulation body combines the control circuit board and the insulating base into a whole, a first through hole for the lug plate to penetrate through is formed in the groove of the end cover body, and the circuit board assembly is provided with a lug plate through hole corresponding to the first through hole. Heat dissipation of electronic elements on the control circuit board is accelerated through the potting body, glue is independently poured into the circuit board assembly, the situation that leaked glue enters an end cover or the interior of the motor is avoided, normal reworking of the motor can be guaranteed when the motor is damaged, waste is reduced, and the lug plate is conveniently positioned through the lug plate through hole.

Description

Technical Field

[0001] This utility model relates to an external rotor motor with an end cover assembly for a motor and its application. Background Technology

[0002] Existing external rotor motors consist of a control circuit board and the motor body. The control circuit board is typically mounted on the end cover of the motor body. Specifically, the end cover has a groove on its outer side, within which an insulating base is installed, and the control circuit board is mounted inside the insulating base. As the power requirements for motors increase, excessive temperature rise occurs, necessitating the application of thermal paste to the control circuit board to accelerate heat dissipation. However, this paste application process is usually performed after the control circuit board is mounted on the end cover. During this process, the thermal paste can flow through the gap between the insulating base and the end cover into the end cover and even into the motor itself, causing motor failure. Furthermore, after paste application, the control circuit board, insulating base, and end cover become integrated, making the motor unrepairable and resulting in significant waste. Utility Model Content

[0003] This utility model provides an external rotor motor with an end cover assembly and its application, which solves the problem in the prior art that after the control circuit board is potted with glue, the control circuit board, the insulating seat and the end cover will become integrated and the motor cannot be repaired.

[0004] The technical solution of this utility model is implemented as follows:

[0005] The first objective of this utility model is to provide a motor end cover assembly, including an end cover body and a circuit board assembly. The end cover body includes a bottom end plate, a bearing seat protruding from the middle of one side of the bottom end plate, and an annular sleeve protruding from the other edge of the bottom end plate. The bottom end plate and the annular sleeve form a groove, and the circuit board assembly is installed in the groove. The circuit board assembly is characterized in that: the circuit board assembly includes an insulating seat and a control circuit board. The insulating seat has a cavity, and the control circuit board is installed in the cavity. The cavity is filled with potting material, which forms a potting body covering the control circuit board. The potting body integrates the control circuit board and the insulating seat into one unit. The bottom end plate of the end cover body has a first through hole for a connector to pass through, and the circuit board assembly has a connector through hole corresponding to the first through hole.

[0006] The aforementioned insulating base includes a base plate and an annular side plate extending upward from the edge of the base plate, and the cavity is formed by the base plate and the annular side plate.

[0007] The aforementioned base plate is provided with several reinforcing ribs.

[0008] The aforementioned reinforcing ribs include several annular reinforcing ribs and several strip reinforcing ribs. All annular reinforcing ribs share a common center. One end of each strip reinforcing rib is connected to one of the annular reinforcing ribs, and the other end of each strip reinforcing rib is connected to the annular side plate.

[0009] The aforementioned through hole for the connector consists of a second through hole in the base plate, a third through hole in the control circuit board, and a fourth through hole in the potting body.

[0010] A sealing gasket is also installed in the second through hole. The sealing gasket has a channel for the connector to pass through, and the side wall of the sealing gasket has a groove. The wall of the second through hole is locked in the groove.

[0011] The upper end of the sealing gasket is located between the base plate and the control circuit board. The upper end extends radially to form a sealing plate. The lower end of the sealing gasket is located below the base plate. A protrusion protrudes downward from the lower end. The protrusion extends into the first through hole of the end cap body. The channel passes through the protrusion.

[0012] The groove described above is provided with several mounting posts, and the circuit board assembly is provided with mounting through holes corresponding to the mounting posts. The tail of a screw passes through the mounting through hole and is installed in the mounting post to fix the circuit board assembly.

[0013] The second objective of this utility model is to provide an external rotor motor, including a stator assembly and a motor end cover assembly. The stator assembly includes three connecting pieces that are connected to the stator windings. The motor end cover assembly is installed on one side of the stator assembly. The characteristic of this utility model is that the motor end cover assembly is the motor end cover assembly described above, and the tail of the connecting piece passes through the first through hole and the connecting piece through hole and protrudes out of the circuit board assembly.

[0014] Compared with the prior art, this utility model has the following advantages:

[0015] 1. The motor end cover assembly of this utility model includes an end cover body and a circuit board assembly. The end cover body includes a bottom plate, a bearing seat protruding from the middle of one side of the bottom plate, and an annular sleeve protruding from the other edge of the bottom plate. The bottom plate and the annular sleeve form a groove. The circuit board assembly includes an insulating seat and a control circuit board. The insulating seat has a cavity, and the control circuit board is installed in the cavity. The cavity is filled with potting material, which forms a potting body covering the control circuit board. The potting body integrates the control circuit board and the insulating seat. The bottom plate of the end cover body has a first through hole for the wiring tab to pass through. The circuit board assembly has wiring tab through holes corresponding to the first through hole. The potting body accelerates the heat dissipation of electronic components on the control circuit board. The circuit board assembly is potted independently, preventing glue leakage into the end cover or motor. In case of motor damage, it can ensure normal rework of the motor, reducing waste. The wiring tab through holes facilitate the positioning of the wiring tabs.

[0016] 2. Other advantages of this utility model are described in detail in the embodiments section. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the structure of the motor end cover assembly provided in Embodiment 1 of this utility model;

[0018] Figure 2 An exploded view of the motor end cover assembly provided in Embodiment 1;

[0019] Figure 3 This is a top view of the circuit board assembly in the motor end cover assembly;

[0020] Figure 4 for Figure 3 AA cross-sectional view;

[0021] Figure 5 for Figure 4 Enlarged view of point B;

[0022] Figure 6 This is a schematic diagram of the structure of the insulating base in a circuit board assembly;

[0023] Figure 7 This is a schematic diagram of the structure of the sealing gasket in a circuit board assembly;

[0024] Figure 8 This is a schematic diagram of the structure of the external rotor motor provided in Embodiment 2 of this utility model. Detailed Implementation

[0025] 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.

[0026] Example 1:

[0027] like Figures 1 to 7As shown, this embodiment provides a motor end cover assembly, including an end cover body 1 and a circuit board assembly 2. The end cover body 1 includes a bottom end plate 15, a bearing seat 14 protruding from the middle of one side of the bottom end plate 15, and an annular sleeve 16 protruding from the other edge of the bottom end plate 15. The bottom end plate 15 and the annular sleeve 16 form a groove 11. The circuit board assembly 2 is installed in the groove 11. The circuit board assembly 2 includes an insulating seat 4 and a control circuit board 3. The insulating seat 4 has a cavity 40. The control circuit board 3 is installed in the cavity 40. The cavity 40 is filled with potting material. The potting material forms a potting body 5 covering the control circuit board 3. The potting body 5 combines the control circuit board 3 and the insulating seat 4 into one unit. The bottom end plate 15 of the end cover body 1 has a first through hole 13 for the wiring piece to pass through. The circuit board assembly 2 has a wiring piece through hole 21 corresponding to the first through hole 13.

[0028] The motor end cover assembly covers the control circuit board 3 with the potting body 5, integrating the control circuit board 3 with the insulating base 4. This accelerates heat dissipation for the electronic components on the control circuit board 3. The circuit board assembly 2 is potted independently, preventing glue leakage into the end cover or motor interior. This also ensures normal rework of the motor in case of damage, reducing waste. The through hole 21 for the connector facilitates connector positioning.

[0029] The aforementioned insulating base 4 includes a base plate 41 and an annular side plate 42 extending upward from the edge of the base plate 41. The cavity 40 is formed by the base plate 41 and the annular side plate 42. The annular side plate 42 facilitates potting while also ensuring the height of the potting body 5.

[0030] The base plate 41 described above is provided with several reinforcing ribs 43. The reinforcing ribs 43 can ensure that the insulating base 4 does not deform due to heat during the baking process after the glue is poured.

[0031] The aforementioned reinforcing rib 43 includes a plurality of annular reinforcing ribs 431 and a plurality of strip reinforcing ribs 432. All annular reinforcing ribs 431 share a common center. One end of each strip reinforcing rib 432 is connected to one of the annular reinforcing ribs 431, and the other end of each strip reinforcing rib 432 is connected to the annular side plate 42. Some strip reinforcing ribs 432 may also be connected to multiple annular reinforcing ribs 431.

[0032] The aforementioned through hole 21 of the connector is composed of a second through hole 44 provided in the base plate 41, a third through hole 31 provided in the control circuit board 3, and a fourth through hole 51 provided in the potting body 5.

[0033] A sealing gasket 6 is also installed inside the second through hole 44. The sealing gasket 6 has a channel 61 for the connector to pass through, and a groove 62 is provided on the side wall of the sealing gasket 6. The wall of the second through hole 44 is locked in the groove 62. The sealing gasket 6 prevents the glue material from flowing out during glue pouring, and the groove 62 facilitates the fixing of the sealing gasket 6.

[0034] The upper end of the gasket 6 as described above is located between the bottom plate 41 and the control circuit board 3. The upper end extends radially to form a sealing plate 63. The lower end 65 of the gasket 6 is located below the bottom plate, and a bump 64 protrudes downward from the lower end 65. The bump 64 extends into the first through hole 13 of the end cap body 1, and the hole 61 penetrates through the bump 64. The entire gasket is in an inverted "soil" shape, which can ensure that when the circuit board assembly 2 is pulled upward, the gasket 61 can withstand a large upward pulling force without falling off.

[0035] A number of mounting posts 12 are provided in the groove 11 as described above. Mounting through holes 22 corresponding to the mounting posts 12 are provided on the circuit board assembly 2. The tail of a screw 23 passes through the mounting through hole 22 and is installed in the mounting post 12 to fix the circuit board assembly 2. The circuit board assembly 2 is convenient to install.

[0036] Embodiment 2:

[0037] As Figure 8 shown, the outer rotor motor provided in this embodiment includes a stator assembly and a motor end cap assembly 100. The stator assembly includes three connection tabs 9 connected to the stator windings. The motor end cap assembly 100 is installed on one side of the stator assembly. The feature is that: the motor end cap assembly 100 is a kind of motor end cap assembly described in Embodiment 1, and the tail of the connection tab 9 passes through the first through hole 13 and the connection tab through hole 21 and protrudes outside the circuit board assembly 2.

[0038] By improving the structure of the motor end cap assembly 100, both the heat dissipation of the control circuit board 3 is improved, and the sealing and safety of the motor are ensured.

[0039] The third through hole 31 of the control circuit board 3 is a via hole, and the connection tab 9 is electrically connected to the control circuit of the control circuit board 3.

[0040] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An electric machine end cover assembly comprising an end cover body (1) and a circuit board assembly (2), the end cover body (1) comprising a bottom end plate (15), a bearing seat (14) protruding from the middle of one side of the bottom end plate (15), a ring sleeve (16) protruding at the edge of the other side of the bottom end plate (15), the bottom end plate (15) and the ring sleeve (16) enclosing a recess (11), the circuit board assembly (2) being mounted in the recess (11), characterized in that: The circuit board assembly (2) comprises an insulating base (4) and a control circuit board (3), the insulating base (4) is provided with a cavity (40), the control circuit board (3) is installed in the cavity (40), the cavity (40) is filled with potting material, the potting material forms a potting body (5) covering the control circuit board (3), the potting body (5) integrates the control circuit board (3) and the insulating base (4) into one, and the bottom end plate (15) of the end cover body (1) is provided with a first through hole (13) through which a terminal lug passes, and the circuit board assembly (2) is provided with a terminal lug through hole (21) corresponding to the first through hole (13).

2. A motor end bell assembly as set forth in claim 1 wherein: The insulating base (4) comprises a bottom plate (41) and an annular side plate (42) extending upward from the edge of the bottom plate (41), and the cavity (40) is surrounded by the bottom plate (41) and the annular side plate (42).

3. A motor end bell assembly as set forth in claim 2 wherein: The bottom plate (41) is provided with a plurality of reinforcing ribs (43).

4. A motor end bell assembly as set forth in claim 3 wherein: The reinforcing ribs (43) comprise a plurality of circular reinforcing ribs (431) and a plurality of strip-shaped reinforcing ribs (432), the circular reinforcing ribs (431) share a common center, one end of the strip-shaped reinforcing rib (432) is connected to one of the circular reinforcing ribs (431), and the other end of the strip-shaped reinforcing rib (432) is connected to the annular side plate (42).

5. An electrical machine end cap assembly according to claim 2 or 3 or 4 wherein: The terminal lug through hole (21) is composed of a second through hole (44) arranged on the bottom plate (41), a third through hole (31) arranged on the control circuit board (3), and a fourth through hole (51) arranged on the potting body (5).

6. A motor end bell assembly as set forth in claim 5 wherein: The second through hole (44) is further provided with a sealing gasket (6), the sealing gasket (6) is provided with a hole (61) through which the terminal lug passes, the side wall of the sealing gasket (6) is provided with a clamping groove (62), and the hole wall of the second through hole (44) is clamped in the clamping groove (62).

7. A motor end bell assembly as set forth in claim 6 wherein: The upper end of the sealing gasket (6) is located between the bottom plate (41) and the control circuit board (3), the upper end extends radially to form a sealing plate (63), the lower end (65) of the sealing gasket (6) is located below the bottom plate, the lower end (65) protrudes downward to form a protrusion (64), the protrusion (64) extends into the first through hole (13) of the end cover body (1), and the hole (61) penetrates the protrusion (64).

8. An electrical machine end cap assembly according to claim 2 or 3 or 4, wherein: The recess (11) is provided with a plurality of mounting columns (12), the circuit board assembly (2) is provided with a mounting through hole (22) corresponding to the mounting column (12), and the tail of a screw (23) passes through the mounting through hole (22) and is installed in the mounting column (12) to fix the circuit board assembly (2).

9. An external rotor electric machine comprising a stator assembly and a machine end cover assembly (100), the stator assembly comprising three terminals (9) connected to stator windings, the machine end cover assembly (100) being mounted on one side of the stator assembly, characterized in that: The motor end cover assembly (100) is the motor end cover assembly of any one of claims 1 to 8, the tail of the terminal lug (9) passes through the first through hole (13) and the terminal lug through hole (21) and protrudes outward from the circuit board assembly (2).

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