Brushless motor

Abstract

The utility model relates to the technical field of motors, and discloses a brushless motor, which comprises a rotor assembly, a stator assembly and a circuit board. The stator assembly sleeves the rotor assembly; the circuit board is arranged on the surface of the stator assembly deviating from the rotor assembly, and a control chip is arranged on the surface of the circuit board facing the stator assembly. A heat dissipation boss extends from the position, corresponding to the control chip, of the stator assembly, and the control chip abuts against the heat dissipation boss. The brushless motor provided by the utility model solves the problems that the occupied space is increased and the assembly steps are tedious because the brushless motor is additionally provided with a heat dissipation structure, thereby improving the production efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field, especially a kind of brushless motor. BACKGROUND

[0002] Brushless motor is a kind of brushless permanent magnet DC motor, and it realizes the commutation of motor by electronic control, without mechanical brush and commutator, compared with brush motor, brushless motor has higher efficiency, longer life, smaller noise and higher operating speed, and the working principle of brushless DC motor is based on electromagnetic induction and Lorentz force principle, when current passes through stator coil, a rotating magnetic field is generated, and the permanent magnet in rotor is subjected to Lorentz force in this rotating magnetic field, causing rotor to rotate with stator magnetic field, and controller realizes the commutation of motor by controlling current and magnetic field.

[0003] Brushless motor contains control chip, in prior art, it is usually necessary to additionally equip heat dissipation structure to dissipate heat of chip, so as to ensure the normal operation of brushless motor, but this setting mode will make the occupied space of brushless motor increase, and assembly step is tedious, thereby reduce production efficiency. SUMMARY

[0004] In order to solve the problems of the prior art, the utility model provides a kind of brushless motor, solve the problem that the occupied space of brushless motor increases due to additional assembly heat dissipation structure, and assembly step is tedious, thereby improve production efficiency.

[0005] The technical effects achieved by the utility model are realized by the following technical solutions:

[0006] The utility model provides a kind of brushless motor, comprising:

[0007] Rotor assembly;

[0008] Stator assembly, sleeve joint in the rotor assembly;And

[0009] Circuit board, it is set on the surface of the stator assembly away from the rotor assembly, and one side of the circuit board towards the stator assembly is arranged with control chip;

[0010] Wherein, the stator assembly and the control chip corresponding place extend heat dissipation boss, and the control chip is abutted on the heat dissipation boss.

[0011] In some implementation modes, heat conduction layer is arranged between the control chip and the heat dissipation boss.

[0012] In the implementation mode, heat conduction layer makes the heat of control chip better conduction to heat dissipation boss, and then conduction to stator assembly through heat dissipation boss, so that the heat dissipation effect of control chip is more superior.

[0013] In some implementations, the stator assembly includes a stator base, a core and a coil, the stator base is sleeved with the rotor assembly, the core is sleeved with the stator base, the coil is arranged around the core, the heat dissipation boss is located on the surface of the stator base away from the coil, and the circuit board is arranged on the surface of the stator base away from the coil and electrically connected with the coil.

[0014] In some implementations, one side of the stator base close to the circuit board is provided with a first fixing structure, and the circuit board is provided with a second fixing structure matched with the first fixing structure.

[0015] In the implementation, the first fixing structure and the second fixing structure are matched and fixed to mount the circuit board on the stator base, thereby improving the connection stability between the circuit board and the stator base, so that the control chip can be stably abutted on the heat dissipation boss, and the reliability of the overall structure is ensured.

[0016] In some implementations, the first fixing structure includes a support column arranged on the periphery of the stator base, the support column is provided with a first fixing hole, and the second fixing structure includes a second fixing hole arranged on the periphery of the circuit board, the second fixing hole and the first fixing hole are fixed by a bolt.

[0017] In some implementations, the stator base is provided with a through hole extending from the side where the coil is located to the side where the circuit board is located, and the lead of the coil is electrically connected with the circuit board through the through hole.

[0018] The through hole and the first fixing structure are arranged on the side of the stator base close to the circuit board, the lead of the coil fixes the first side of the circuit board, and the first fixing structure and the second fixing structure fix the second side of the circuit board to make the control chip adhere to the heat dissipation boss.

[0019] In the implementation, the lead of the coil passes through the through hole of the stator base and is electrically connected with the circuit board, so that the first side of the circuit board is connected with the stator base through the lead, the control chip is abutted on the heat dissipation boss, and the bolt is used to fix the second side of the circuit board on the stator base by passing through the second fixing hole and the first fixing hole at the same time.

[0020] In some implementations, the brushless motor further includes a capacitor assembly, the capacitor assembly is arranged on the side of the circuit board away from the control chip and is electrically connected with the circuit board.

[0021] In some implementations, the brushless motor further comprises a flexible fixing frame, which simultaneously fixes the circuit board and the capacitor assembly.

[0022] In some implementations, the flexible fixing frame comprises a first adhesive layer and at least a second adhesive layer, the first adhesive layer is arranged between the circuit board and the capacitor assembly, and the second adhesive layer is connected to a first side of the capacitor assembly and a side of the first adhesive layer, respectively.

[0023] In the present implementation, the first adhesive layer enables stable connection between the circuit board and the capacitor assembly, and the second adhesive layer is connected to the first side of the capacitor assembly and the side of the first adhesive layer, respectively, to increase the area of connection with the capacitor assembly, thereby enhancing the fixing effect.

[0024] In some implementations, the flexible fixing frame further comprises a third adhesive layer, which is connected to a second side of the capacitor assembly and to the ends of the first adhesive layer and the second adhesive layer, respectively, and the second side is perpendicular to the first side.

[0025] In summary, the present utility model has at least the following advantages:

[0026] The brushless motor provided by the present utility model has the stator assembly sleeved on the rotor assembly, the heat dissipation boss is extended on the surface of the stator assembly away from the rotor assembly, the circuit board is arranged on the stator assembly, and the control chip arranged on the circuit board abuts against the heat dissipation boss, so that the heat of the control chip is conducted to the heat dissipation boss and then to the stator assembly, thereby achieving heat dissipation of the control chip. Since the heat dissipation boss is extended from the side of the stator base away from the rotor assembly, the heat of the control chip can be better conducted to the stator assembly, better heat dissipation effect is achieved, the occupied space of the overall structure is reduced, the problem that the occupied space of the brushless motor is increased due to additional assembly of the heat dissipation structure and the assembly steps are complicated is solved, and thus the production efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 FIG. 1 is a structural schematic diagram of the brushless motor of Example 1;

[0028] Figure 2 FIG. 2 is a structural schematic diagram of the heat dissipation boss shown in FIG. 1; Figure 1

[0029] Figure 3 FIG. 4 is a structural schematic diagram of the heat conduction layer of Example 1;

[0030] Figure 4 FIG. 5 is a structural schematic diagram of the stator assembly of Example 1;

[0031] Figure 5 ​A structure schematic view of the first fixing hole and the second fixing hole shown in Fig.

[0032] Figure 6 A structure schematic view of the first fixing hole and the second fixing hole shown in Fig. Figure 5

[0033] A structure schematic view of the first fixing hole and the second fixing hole shown in Fig. Figure 7

[0034] A structure schematic view of the first fixing hole and the second fixing hole shown in Fig. Figure 8 Figure 7 A structure schematic view of the first fixing hole and the second fixing hole shown in Fig.

[0035] Markings in the figure:

[0036] 1, rotor assembly;

[0037] 2, stator assembly; 21, heat dissipation boss; 22, heat conduction layer; 23, stator base; 231, first fixing structure; 2311, support column; 2312, first fixing hole; 232, through hole; 24, core; 25, coil; 251, lead wire;

[0038] 3, circuit board; 31, control chip; 32, second fixing structure; 321, second fixing hole;

[0039] 4, capacitor assembly;

[0040] 5, flexible fixing frame; 51, first adhesive layer; 52, second adhesive layer; 53, third adhesive layer;

[0041] 6, bolt. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. The described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application.

[0043] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0044] Embodiment 1:

[0045] Please refer to the drawings Figure 1 Drawings Figure 4 ​The utility model discloses a brushless motor, including rotor subassembly 1, stator subassembly 2 and circuit board 3.

[0046] Among them, please combine Figure 1 And Figure 2 , Figure 1 And Figure 2 The structure relationship of the heat dissipation boss 21 on the rotor subassembly 1, the stator subassembly 2 and the control chip 31 on the circuit board 3 in the utility model embodiment is shown. Specifically, the stator subassembly 2 is sleeved on the rotor subassembly 1;The circuit board 3 is arranged on the surface of the stator subassembly 2 away from the rotor subassembly 1, and one side of the circuit board 3 towards the stator subassembly 2 is provided with the control chip 31. Wherein, the stator subassembly 2 extends the heat dissipation boss 21 at the corresponding place of the control chip 31, and the control chip 31 abuts on the heat dissipation boss 21.

[0047] In the embodiment, the control chip 31 is provided on the circuit board 3, and the heat dissipation boss 21 corresponding to the control chip 31 is provided on one side of the stator subassembly 2 away from the rotor subassembly 1, when the circuit board 3 is installed on one side of the stator subassembly 2 away from the rotor subassembly 1, the control chip 31 abuts on the heat dissipation boss 21, so that the heat of the control chip 31 can be conducted to the heat dissipation boss 21, and then conducted to the stator subassembly 2 through the heat dissipation boss 21, thereby realizing the heat dissipation of the control chip 31. It can be understood that, since the heat dissipation boss 21 extends from the stator subassembly 2, the control chip 31 conducts heat to the stator subassembly 2 for heat dissipation through the heat dissipation boss 21, without the need for additional heat dissipation structure to achieve good heat dissipation effect, and also reduces the occupied space of the brushless motor, making the brushless motor more suitable for different application scenarios. Further, the heat dissipation boss 21 also plays a role in supporting the circuit board 3, making the connection between the circuit board 3 and the stator subassembly 2 more stable, and thus making the overall structure more compact.

[0048] The above-mentioned brushless motor, the stator subassembly 2 is sleeved on the rotor subassembly 1, the heat dissipation boss 21 extends on the surface of the stator subassembly 2 away from the rotor subassembly 1, the circuit board 3 is arranged on the stator subassembly 2, and the control chip 31 arranged on the circuit board 3 abuts on the heat dissipation boss 21, so that the heat of the control chip 31 is conducted to the heat dissipation boss 21, and then conducted to the stator subassembly 2 through the heat dissipation boss 21, thereby realizing the heat dissipation of the control chip 31. Since the heat dissipation boss 21 extends from the surface of the stator base 23 away from the rotor subassembly 1, not only can the heat of the control chip 31 be better conducted to the stator subassembly 2 to achieve better heat dissipation effect, but also reduces the occupied space of the overall structure, solving the problem that the brushless motor causes the occupied space to increase due to the additional assembly of the heat dissipation structure, and the assembly steps are complicated, thereby improving the production efficiency.

[0049] In some preferred embodiments, please see Figure 3 , Figure 3The structural relationship between the heat conduction layer 22 and the heat dissipation boss 21 is shown in the embodiment of the utility model.

[0050] In some more preferred embodiments, please refer to Figure 4 , Figure 4 The structural relationship among the stator base 23, the iron core 24 and the coil 25 is shown in the embodiment of the utility model.

[0051] Embodiment 2:

[0052] The difference between this embodiment and embodiment 1 is that this embodiment further optimizes the structure of the brushless motor of the utility model. Figure 5 Figure 6 .

[0053] In some preferred embodiments, please refer to Figure 5 , Figure 5 The structural relationship between the first fixing structure 231 and the second fixing structure 32 is shown in the embodiment of the utility model.

[0054] In this embodiment, the first fixing structure 231 and the second fixing structure 32 are fixed with each other to install the circuit board 3 on the stator base 23, thereby improving the connection stability between the circuit board 3 and the stator base 23, so that the control chip 31 can be stably abutted against the heat dissipation boss 21, and the reliability of the overall structure is ensured.

[0055] In some preferred embodiments, please refer to Figure 6 , Figure 6 ​The structural relationship between the first fixing hole 2312 formed on the support column 2311 and the second fixing hole 321 formed on the circuit board 3 is shown. Specifically, the first fixing structure 231 includes the support column 2311 arranged on the periphery of the stator base 23, and the first fixing hole 2312 is formed on the support column 2311. The second fixing structure 32 includes the second fixing hole 321 formed on the periphery of the circuit board 3, and the second fixing hole 321 and the first fixing hole 2312 are fixed by the threaded bolt 6. During installation, the second fixing hole 321 on the circuit board 3 is aligned with the support column 2311 on the stator base 23, so that the second fixing hole 321 is aligned with the first fixing hole 2312, and then the threaded bolt 6 is simultaneously threaded through the second fixing hole 321 and the first fixing hole 2312, so as to fixedly install the circuit board 3 on the side of the stator base 23 away from the coil 25.

[0056] It can be understood that the circuit board 3 can be installed on the stator base 23 by clamping or welding, rather than by the threaded bolt 6 simultaneously threaded through the second fixing hole 321 and the first fixing hole 2312.

[0057] In some preferred embodiments, the stator base 23 is provided with a through hole 232 extending from the side where the coil 25 is located to the side where the circuit board 3 is located, and the lead 251 of the coil 25 is electrically connected to the circuit board 3 through the through hole 232. The lead 251 of the coil 25 is electrically connected to the circuit board 3 through the through hole 232 formed on the stator base 23, so that the overall structure is more compact, and the lead 251 of the coil 25 is protected, avoiding scratching of the lead 251 with external equipment and thus causing failure.

[0058] Further, the through hole 232 and the first fixing structure 231 are arranged on the side of the stator base 23 close to the circuit board 3, the lead 251 of the coil 25 fixes the first side of the circuit board 3, the first fixing structure 231 and the second fixing structure 32 cooperate to fix the second side of the circuit board 3, so that the control chip 31 is attached to the heat dissipation boss 21. The lead 251 of the coil 25 passes through the through hole 232 of the stator base 23 and is electrically connected to the circuit board 3, so that the first side of the circuit board 3 is connected to the stator base 23 through the lead 251, the control chip 31 abuts against the heat dissipation boss 21, and the threaded bolt 6 is simultaneously threaded through the second fixing hole 321 and the first fixing hole 2312 to fix the second side of the circuit board 3 on the stator base 23. In this way, the control chip 31 is tightly attached to the heat dissipation boss 21, thereby ensuring the reliability of the control chip 31 conducting heat to the stator base 23 through the heat dissipation boss 21, and achieving effective heat dissipation of the control chip 31.

[0059] Embodiment 3:

[0060] The difference between the embodiment and embodiment 2 is that the brushless motor of the embodiment is further optimized in structure, please refer to the accompanying drawings Figure 7 Figure 8 .

[0061] Among them, please see Figure 7 , Figure 7 The structure relationship between the capacitor assembly 4 and the circuit board 3 in the embodiment of the utility model is shown. Specifically, the brushless motor further comprises a capacitor assembly 4, the capacitor assembly 4 is arranged on the side of the circuit board 3 away from the control chip 31 and is electrically connected with the circuit board 3. The capacitor assembly 4 provides additional current when the brushless motor starts, thereby increasing the starting torque of the brushless motor, and further ensuring the efficiency and performance of the brushless motor.

[0062] In some preferred embodiments, the brushless motor further comprises a flexible fixing frame 5, the flexible fixing frame 5 is fixedly connected with the circuit board 3 and the capacitor assembly 4. The flexible fixing frame 5 is arranged between the circuit board 3 and the capacitor assembly 4, thereby stably connecting the circuit board 3 and the capacitor assembly 4, avoiding the problem that the capacitor assembly 4 falls off from the circuit board 3 and affects the normal operation of the brushless motor, and further ensuring the reliability of the brushless motor. Preferably, the flexible fixing frame 5 is a glue structure.

[0063] In some preferred embodiments, the flexible fixing frame 5 comprises a first glue layer 51 and at least one second glue layer 52, the first glue layer 51 is arranged between the circuit board 3 and the capacitor assembly 4, and the second glue layer 52 is connected to one side of the first glue layer 51 and the first side of the capacitor assembly 4 respectively. The first glue layer 51 stably connects the circuit board 3 and the capacitor assembly 4, and the second glue layer 52 is connected to one side of the first glue layer 51 and the first side of the capacitor assembly 4 respectively, so as to increase the area of connecting the capacitor assembly 4, and further enhance the fixing effect. Preferably, the second glue layer 52 has two, and the two second glue layers 52 are connected to opposite sides of the capacitor assembly 4 and one side of the first glue layer 51, that is, the opposite sides of the first glue layer 51 are respectively connected with a first glue layer 51.

[0064] In some more preferred embodiments, please refer to Figure 8 , Figure 8 ​The utility model discloses a flexible fixing frame 5 still includes third viscose layer 53, and third viscose layer 53 is connected to the second side of capacitor assembly 4, and is connected to the end of first viscose layer 51 and second viscose layer 52 respectively, and the second side is perpendicular to the first side. Increase the connecting area between flexible fixing frame 5 and capacitor assembly 4, so that capacitor assembly 4 is more stable to connect to circuit board 3, avoid the problem that capacitor assembly 4 and flexible fixing frame 5 produce slack, further guarantee the reliability of overall structure.

[0065] The utility model discloses a brushless motor, stator assembly 2 is sleeved in rotor assembly 1, and the surface of stator assembly 2 away from rotor assembly 1 extends heat dissipation boss 21, and circuit board 3 is arranged on stator assembly 2, and the control chip 31 on circuit board 3 is abutted on heat dissipation boss 21, so that the heat of control chip 31 is conducted to heat dissipation boss 21, and is conducted to stator assembly 2 through heat dissipation boss 21, to realize the heat dissipation of control chip 31. Since heat dissipation boss 21 extends from the side of stator base 23 away from rotor assembly 1, not only can the heat of control chip 31 be better conducted to stator assembly 2, better heat dissipation effect is realized, but also the occupied space of overall structure is reduced, the problem that the occupied space of brushless motor is increased due to additional assembly heat dissipation structure and the assembly step is complicated is solved, thereby improve production efficiency.

[0066] In the utility model, unless another explicit provision and limitation, the terms "installation", "connection", "connection", "fixing" and so on should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integral ; can be mechanical connection, also can be electrical connection;It can be directly connected, also can be indirectly connected through the intermediate medium, it can be the communication of two elements or the interaction of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0067] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" is based on the orientation or position relationship shown in the drawing, or the orientation or position relationship of the utility model product when using, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the indicated device or element must have a particular orientation, a particular orientation and operation, therefore it can not be understood as the limitation of the utility model. In addition, the terms "first", "second", "third" are only used for distinguishing description, and can not be understood as indicating or implying relative importance.

[0068] Furthermore, the terms "horizontal," "vertical," "up," "down," "upper," "lower," and the like are used herein for the convenience of the reader in relation to the illustrations given. They do not require the described structure or arrangement to be absolutely horizontal or completely vertical in order to be within the scope of the present application.

[0069] In the present application, unless specifically stated and limited otherwise, a first feature above or below a second feature can include the first and second features being in direct contact, or can include the first and second features not being in direct contact but being in contact through another feature therebetween. Also, a first feature above, over and on a second feature includes the first feature directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. A first feature below, under and under a second feature includes the first feature directly below and obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0070] Although the present application has been described in connection with the embodiments thereof, it will occur to those skilled in the art that modifications and / or improvements can be made to the described embodiments without departing from the spirit and scope of the application. Therefore, it is to be understood that all such modifications and / or improvements are intended to be included within the scope of the following claims.

Claims

1. A brushless electric motor characterized by, The brushless motor comprises a rotor assembly (1), a stator assembly (2) sleeved on the rotor assembly (1), and a circuit board (3) arranged on a surface of the stator assembly (2) away from the rotor assembly (1), wherein one side of the circuit board (3) is provided with a control chip (31). The stator assembly (2) extends a heat dissipation boss (21) corresponding to the control chip (31), and the control chip (31) abuts against the heat dissipation boss (21). A heat conduction layer (22) is arranged between the control chip (31) and the heat dissipation boss (21). The stator assembly (2) comprises a stator base (23), an iron core (24) and a coil (25), the stator base (23) is sleeved on the rotor assembly (1), the iron core (24) is sleeved on the stator base (23), the coil (25) is arranged on the iron core (24), the heat dissipation boss (21) is arranged on a surface of the stator base (23) away from the coil (25), and the circuit board (3) is arranged on the surface of the stator base (23) away from the coil (25) and electrically connected with the coil (25). A first fixing structure (231) is arranged on one side of the stator base (23) close to the circuit board (3), and a second fixing structure (32) is arranged on the circuit board (3) and matched with the first fixing structure (231). The first fixing structure (231) comprises a support column (2311) arranged on the periphery of the stator base (23), and a first fixing hole (2312) is arranged on the support column (2311), the second fixing structure (32) comprises a second fixing hole (321) arranged on the periphery of the circuit board (3), and the second fixing hole (321) and the first fixing hole (2312) are fixed by a bolt (6).

2. The brushless motor of claim 1, wherein, The stator base (23) is provided with a through hole (232) extending from the side where the coil (25) is arranged to the side where the circuit board (3) is arranged, and a lead wire (251) of the coil (25) is electrically connected with the circuit board (3) through the through hole (232).

3. The brushless motor of claim 1, wherein, The through hole (232) and the first fixing structure (231) are arranged on one side of the stator base (23) close to the circuit board (3), the lead wire (251) of the coil (25) is fixed to one side of the circuit board (3), the first fixing structure (231) and the second fixing structure (32) are matched to fix the other side of the circuit board (3), so that the control chip (31) is attached to the heat dissipation boss (21).

4. The brushless motor of claim 3, wherein, The brushless motor further comprises a capacitor assembly (4) arranged on one side of the circuit board (3) away from the control chip (31) and electrically connected with the circuit board (3).

5. The brushless motor of claim 4, wherein, The brushless motor further comprises a flexible fixing frame (5) fixedly connected with the circuit board (3) and the capacitor assembly (4).

6. The brushless motor of claim 4, wherein, ​ ​ 7. The brushless motor of claim 1, wherein, ​ 8. The brushless motor of claim 7, wherein, ​ 9. The brushless motor of claim 8, wherein, The flexible fixing frame (5) comprises a first adhesive layer (51) and at least a second adhesive layer (52), the first adhesive layer (51) is arranged between the circuit board (3) and the capacitor assembly (4), and the second adhesive layer (52) is connected to one side of the first adhesive layer (51) and the first side of the capacitor assembly (4) respectively.

10. The brushless motor of claim 9, wherein, The flexible fixing frame (5) further comprises a third adhesive layer (53), the third adhesive layer (53) is connected to the second side of the capacitor assembly (4), and is connected to the end of the first adhesive layer (51) and the second adhesive layer (52) respectively, and the second side is perpendicular to the first side.

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