A brushless motor

Abstract

The utility model relates to motor technical field discloses a kind of brushless motor, the brushless motor above-mentioned includes shell, stator assembly, rotor assembly and end cover assembly. Shell is provided with accommodating cavity and the opening being communicated with accommodating cavity;Stator assembly is installed in accommodating cavity;Rotor assembly is worn in stator assembly;End cover assembly is covered in the opening;Elastic limit gasket is arranged between stator assembly and end cover assembly, elastic limit gasket has mutually diverging first abutment surface and second abutment surface, first abutment surface and the upper end surface of stator assembly elastically abut, second abutment surface and end cover assembly elastically abut, to stator assembly is fixed in accommodating cavity.The utility model's brushless motor avoids that stator assembly occurs axial displacement and circumferential rotation relative to shell, and need not to wait for glue solidification and eliminates the failure risk caused by leaking glue.

Description

Technical Field

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

[0002] A brushless motor mainly consists of a housing, a stator assembly, and a rotor assembly, all three coaxially connected. The stator assembly is fixed inside the housing, and the rotor assembly is driven to rotate when the coils are energized, thus generating power. The connection strength between the stator core and the inner wall of the housing directly affects the motor's operational stability.

[0003] In existing technologies, a common method is to use adhesive to fix the two components. After applying the adhesive manually or mechanically, the stator core is pressed into the housing, and the connection is formed after the adhesive cures. However, this method has the following problems: Firstly, the continuous vibration during motor operation and the load generated by starting, stopping, and impact can easily cause the adhesive bonding structure to fail, which can easily lead to axial displacement or circumferential rotation of the stator core, destroy the pre-set uniform air gap between the stator assembly and the rotor assembly, and thus lead to the deterioration of electromagnetic performance. Secondly, in the manual or mechanical glue application process, defects such as missed application, insufficient application, or uneven coating are difficult to detect. Defective products are easy to flow into downstream products. Moreover, because process defects are common to batches, they can easily lead to batch failures, and product quality cannot be effectively guaranteed. Utility Model Content

[0004] To address the shortcomings of the prior art, this invention provides a brushless motor that avoids axial displacement and circumferential rotation of the stator assembly relative to the housing, eliminates the need to wait for the adhesive to cure, and removes the risk of malfunction caused by missed adhesive application.

[0005] The technical effect to be achieved by this utility model is realized through the following technical solution: This utility model provides a brushless motor, comprising: The housing has a receiving cavity and an opening communicating with the receiving cavity; The stator assembly is installed within the accommodating cavity; The rotor assembly is inserted into the stator assembly; End cap assembly, covering the opening; and An elastic limiting gasket is disposed between the stator assembly and the end cap assembly. The elastic limiting gasket has a first abutting surface and a second abutting surface that are opposite to each other. The first abutting surface elastically abuts against the upper end surface of the stator assembly, and the second abutting surface elastically abuts against the end cap assembly, so as to fix the stator assembly in the receiving cavity.

[0006] In some implementations, the brushless motor further includes a circuit board assembly disposed between the stator assembly and the elastic limiting gasket, and electrically connected to the stator assembly, wherein the first abutting surface elastically abuts against the circuit board assembly.

[0007] In this implementation, the first contact surface of the elastic limiting gasket is tightly fitted to the circuit board assembly, and the end cap assembly generates a pre-compression elastic force to generate a continuous clamping force along the axial direction of the brushless motor, clamping the circuit board assembly between the upper end surface of the stator assembly and the elastic limiting gasket.

[0008] In some implementations, the circuit board assembly has solder joints, and the elastic limiting pad has a clearance channel on the side of the circuit board assembly that avoids the solder joints.

[0009] In some implementations, the end cap assembly includes a rear cover with a recessed platform on the side facing away from the receiving cavity, and the elastic limiting gasket extends with a protrusion that cooperates with and limits the recessed platform.

[0010] In this implementation, the protrusion of the elastic limiting gasket can be directly embedded into the recess of the back cover, which can quickly determine the installation position of the elastic limiting gasket and the back cover, improving assembly efficiency and positional accuracy.

[0011] In some implementations, the stator assembly includes a stator core and an insulating structure. The stator core is installed within the accommodating cavity, and the insulating structure covers the stator core. The insulating structure has a first end face and a second end face that are opposite to each other. A first support block for supporting the circuit board assembly is provided on the first end face, and a second support block for supporting the bottom of the housing is provided on the second end face.

[0012] In this implementation, the first support block is used to support the circuit board, so as to achieve stable mounting of the circuit board and at the same time, to ensure the relative position of the Hall sensor and the rotor assembly; the second support block is used to support the stator core, so as to achieve stable support of the stator core.

[0013] In some implementations, the circuit board assembly has a snap-fit ​​hole, and the first end face also has a snap hook, which snaps into the snap-fit ​​hole.

[0014] In some implementations, the elastic limiting pad has a clearance hole to avoid obstructing the hook.

[0015] In some implementations, the stator assembly further includes stator windings and leads, the stator windings being sleeved on the insulating structure and electrically connected to the circuit board assembly, and the leads being electrically connected to the circuit board assembly.

[0016] In some implementations, the elastic limiting gasket has a clearance groove to avoid obstructing the lead wire.

[0017] In some implementations, the outer peripheral wall of the stator core is fitted to the inner wall of the accommodating cavity.

[0018] In summary, this utility model has at least the following advantages: The brushless motor provided by this utility model has an elastic limiting gasket disposed between the upper end face of the stator assembly and the end cover assembly. The first abutting surface is tightly and elastically abutting the upper end face of the stator assembly, and the second abutting surface is tightly and elastically abutting the side of the end cover assembly near the receiving cavity. By utilizing the pre-compression formed by the pressing of the end cover assembly, the elastic limiting gasket always maintains a stable normal pressure to generate a continuous clamping force on the stator assembly. Combined with the high-friction contact surface, it forms a glue-free mechanical lock for the stator assembly, preventing the stator assembly from axial displacement and circumferential rotation relative to the housing. It also eliminates the need to wait for the glue to cure and eliminates the risk of failure caused by missed glue application. Attached Figure Description

[0019] Figure 1 Exploded views of brushless motors in some embodiments; Figure 2 for Figure 1 An exploded view of the brushless motor from another perspective; Figure 3 This is a cross-sectional schematic diagram of a brushless motor according to some embodiments; Figure 4 This is a schematic diagram of the structure of a brushless motor according to some embodiments.

[0020] Marked in the image: 100. Shell; 101. Receiving cavity; 102. Opening; 200. Stator assembly; 210. Stator core; 220. Insulation structure; 221. First end face; 2211. First support block; 2212. Hook; 222. Second end face; 2221. Second support block; 230. Stator winding; 300. Rotor assembly; 310. Shaft; 320. Rotor core; 330. Permanent magnet; 400. End cap assembly; 410. Rear cover; 411. Recessed platform; 412. Mounting hole; 420. Bearing; 500, Elastic limiting gasket; 501, Alternating channel; 502, Alternating hole; 503, Alternating groove; 510, First abutting surface; 520, Second abutting surface; 530, Boss; 600, Circuit board assembly; 610, Circuit board; 611, Solder joint; 612, Snap-in hole; 620, Hall sensor. Detailed Implementation

[0021] 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. The described embodiments are some, but not all, of the embodiments of this utility model.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] Example 1: Please see the appendix Figure 1 ~Appendix Figure 2 The brushless motor of this utility model includes a housing 100, a stator assembly 200, a rotor assembly 300, and an end cover assembly 400.

[0024] In this regard, please combine Figure 1 and Figure 2 , Figure 1 and Figure 2 The diagram illustrates the structural relationship between the housing 100, stator assembly 200, rotor assembly 300, and end cap assembly 400 in this embodiment of the present invention. Specifically, the housing 100 has a receiving cavity 101 and an opening 102 communicating with the receiving cavity 101; the stator assembly 200 is installed in the receiving cavity 101; the rotor assembly 300 passes through the stator assembly 200; the end cap assembly 400 covers the opening 102; an elastic limiting gasket 500 is disposed between the stator assembly 200 and the end cap assembly 400, the elastic limiting gasket 500 having a first abutting surface 510 and a second abutting surface 520 that are opposite to each other, the first abutting surface 510 elastically abutting with the upper end surface of the stator assembly 200, and the second abutting surface 520 elastically abutting with the end cap assembly 400, so as to fix the stator assembly 200 in the receiving cavity 101.

[0025] In this embodiment, the accommodating cavity 101 protects the stator assembly 200 from scratching with external objects, thus preventing damage; the rotor assembly 300 rotates relative to the stator assembly 200, thereby enabling the brushless motor to operate stably. To prevent the stator assembly 200 from being subjected to continuous vibration and loads generated during motor operation, which could cause axial displacement or circumferential rotation along the housing 100, an elastic limiting gasket 500 is provided between the upper end face of the stator assembly 200 and the end cover assembly 400. The elastic limiting gasket 500 has a first abutting surface 510 and a second abutting surface 520 that are opposite to each other. The first abutting surface 510 is in elastic contact with the upper end face of the stator assembly 200, and the second abutting surface 520 is in elastic contact with the side of the end cover assembly 400 near the receiving cavity 101, thereby firmly installing the stator assembly 200 in the receiving cavity 101 and preventing axial displacement or axial rotation of the stator assembly 200.

[0026] It is understandable that the pre-compression formed by the pressing of the end cap assembly 400 ensures that the elastic limiting gasket 500 maintains a stable normal elastic force, and the first abutment surface 510 generates a continuous pressing force on the upper end surface of the stator assembly 200, preventing the stator assembly 200 from being displaced due to the impact of the brushless motor starting and stopping or continuous vibration. Furthermore, the elasticity of the elastic limiting gasket 500 can actively fill the tiny assembly gap between the stator assembly 200 and the end cap assembly 400, ensuring that the stator assembly 200 and the receiving cavity 101 maintain a relatively fixed axial position.

[0027] Furthermore, the elastic limiting gasket 500 has high frictional properties. Under continuous normal pressure, a tightly fitting friction pair is formed between the first contact surface 510 and the upper end surface of the stator assembly 200, and between the second contact surface 520 and the end cap assembly 400. When the stator assembly 200 rotates circumferentially due to electromagnetic torque reaction force or vibration, the friction pair can generate a reverse frictional torque, preventing the stator assembly 200 from rotating circumferentially relative to the housing 100. Moreover, the elastic limiting gasket 500 can absorb the high-frequency vibration generated during brushless motor operation, reducing the impact loss on the stator assembly 200 caused by vibration, thereby preventing circumferential loosening of the stator assembly 200 due to vibration accumulation. Preferably, the elastic limiting gasket 500 can be a rubber gasket.

[0028] In the aforementioned brushless motor, the elastic limiting gasket 500 is disposed between the upper end face of the stator assembly 200 and the end cover assembly 400. The first abutting surface 510 is in tight elastic contact with the upper end face of the stator assembly 200, and the second abutting surface 520 is in tight elastic contact with the side of the end cover assembly 400 near the receiving cavity 101. Utilizing the pre-compression formed by the pressing of the end cover assembly 400, the elastic limiting gasket 500 maintains a stable normal pressure to generate a continuous clamping force on the stator assembly 200. Combined with the high-friction contact surface, it forms a glue-free mechanical lock for the stator assembly 200, preventing the stator assembly 200 from undergoing axial displacement and circumferential rotation relative to the housing 100. Furthermore, it eliminates the need to wait for the adhesive to cure and removes the risk of failure caused by missed adhesive application.

[0029] Example 2: The difference between this embodiment and Embodiment 1 is that this embodiment further optimizes the structure of the brushless motor of this utility model. Please refer to the appendix. Figure 1 ~Appendix Figure 4 .

[0030] Please see below. Figure 1 , Figure 1 The diagram illustrates the structural relationship between the circuit board assembly 600, the stator assembly 200, and the elastic limiting pad 500 in this embodiment of the present invention. Specifically, the brushless motor further includes the circuit board assembly 600, which is disposed between the stator assembly 200 and the elastic limiting pad 500 and is electrically connected to the stator assembly 200. The first abutting surface 510 elastically abuts against the circuit board assembly 600.

[0031] In this embodiment, the first contact surface 510 of the elastic limiting pad 500 is tightly fitted to the circuit board assembly 600, and the end cap assembly 400 generates a pre-compression elastic force to generate a continuous clamping force along the axial direction of the brushless motor, clamping the circuit board assembly 600 between the upper end surface of the stator assembly 200 and the elastic limiting pad 500, so as to prevent it from axial displacement due to the axial impact of the start and stop of the brushless motor. At the same time, the elastic deformation of the elastic limiting pad 500 compensates for the assembly gap, preventing the circuit board assembly 600 from rigidly colliding with the end cap assembly 400.

[0032] Furthermore, the end cap assembly 400, the elastic limiting gasket 500, the circuit board assembly 600, and the stator assembly 200 are arranged coaxially in sequence so that the pre-compression elastic force generated by the end cap assembly 400 fixes the circuit board assembly 600 and the stator assembly 200 in the receiving cavity 101 of the housing 100, thereby preventing the circuit board assembly 600 and the stator assembly 200 from axial displacement and circumferential rotation.

[0033] Furthermore, the circuit board assembly 600 includes a circuit board 610 and a Hall sensor 620. The Hall sensor 620 is disposed on the side of the circuit board 610 near the stator assembly 200. The first contact surface 510 of the elastic limiting pad 500 is in contact with the side of the circuit board 610 opposite to the Hall sensor 620, ensuring a tight fit. The Hall sensor 620 is used to detect the magnetic pole position of the permanent magnet 330 of the rotor assembly 300 in real time and converts the position signal into an electrical signal and transmits it to the circuit board 610. The circuit board 610 precisely switches the energizing phase sequence of the stator winding 230 according to the signal, so that the rotating magnetic field generated by the stator assembly 200 is always matched with the position of the permanent magnet 330, thereby driving the brushless motor to rotate continuously and stably.

[0034] In some preferred embodiments, please refer to Figure 2 , Figure 2 The diagram illustrates the structural relationship between the circuit board assembly 600 and the elastic limiting pad 500 in this embodiment of the invention. Specifically, the circuit board assembly 600 has solder joints 611, and the elastic limiting pad 500 has a recessed channel 501 on its side near the circuit board assembly 600 to avoid contact with the solder joints 611. The recessed channel 501 is used to avoid contact between the elastic limiting pad 500 and the solder joints 611, preventing the elastic limiting pad 500 from directly contacting the solder joints 611 and bearing concentrated stress under pre-compression force, which could lead to cracking, poor soldering, or pad detachment of the solder joints 611. The recessed channel 501 allows the solder joints 611 to be in a pressure-free space, protecting the integrity of the electrical connection. At the same time, it also ensures a close fit between the elastic limiting pad 500 and the circuit board 610.

[0035] In some more preferred embodiments, the end cap assembly 400 includes a rear cover 410, with a recess 411 formed on the side of the rear cover 410 facing away from the receiving cavity 101. An elastic limiting gasket 500 extends with a protrusion 530 that engages with and limits the recess 411. During assembly, the protrusion 530 of the elastic limiting gasket 500 can be directly embedded into the recess 411 of the rear cover 410, enabling quick determination of the installation positions of the elastic limiting gasket 500 and the rear cover 410, improving assembly efficiency and positional accuracy. Simultaneously, it ensures a tight fit between the elastic limiting gasket 500 and the circuit board 610.

[0036] Furthermore, the end cover assembly 400 also includes a bearing 420, and a mounting hole 412 is provided at the center of the rear cover 410. The bearing 420 is installed in the mounting hole 412, and the rotor assembly 300 passes through the bearing 420.

[0037] Furthermore, the rotor assembly 300 includes a rotating shaft 310, a rotor core 320, and a permanent magnet 330. The rotor core 320 is sleeved on the rotating shaft 310, the permanent magnet 330 is sleeved on the rotor core 320, and the rotating shaft 310 passes through the bearing 420.

[0038] Example 3: The difference between this embodiment and Embodiment 2 is that this embodiment further optimizes the structure of the brushless motor of this utility model. Please refer to the appendix. Figure 3 ~Appendix Figure 4 .

[0039] Please see below. Figure 3 , Figure 3 The diagram illustrates the structural relationship between the stator core 210 and the insulation structure 220 in this embodiment of the present invention. Specifically, the stator assembly 200 includes a stator core 210 and an insulation structure 220. The stator core 210 is installed in the accommodating cavity 101, and the insulation structure 220 covers the stator core 210. The insulation structure 220 has a first end face 221 and a second end face 222 that are opposite to each other. The first end face 221 is provided with a first support block 2211 for supporting the circuit board assembly 600, and the second end face 222 is provided with a second support block 2221 that supports the bottom of the housing 100.

[0040] In this embodiment, the first support block 2211 supports the circuit board 610, ensuring its stable installation. Simultaneously, it maintains the relative position of the Hall sensor 620 and the rotor assembly 300, ensuring the Hall sensor 620 can accurately detect the magnetic pole position of the rotor assembly 300. This also prevents the circuit board 610 from rubbing against the upper surface of the stator assembly 200 due to its own weight or vibration, protecting the circuit components and insulation structure 220. The second support block 2221 supports the stator core 210, providing stable support and allowing the stator core 210 to form a rigid contact with the housing 100 via the second support block 2221, thereby enhancing the installation stability of the stator assembly 200 within the accommodating cavity 101.

[0041] In some preferred embodiments, the circuit board assembly 600 has a snap-fit ​​hole 612, and the first end face 221 also has a snap hook 2212, which snaps into the snap-fit ​​hole 612. During assembly, the snap hook 2212 is aligned and inserted into the snap-fit ​​hole 612, which can quickly determine the circumferential and radial positions of the circuit board 610 on the stator assembly 200. Combined with the axial support of the first support block 2211, it avoids the problem of the circuit board 610 shifting or tilting, thereby improving assembly efficiency and positional accuracy.

[0042] In some preferred embodiments, the elastic limiting pad 500 has a clearance hole 502 for the clearance hook 2212. The clearance hole 502 partially avoids the position of the hook 2212, allowing the elastic limiting pad 500 to fit tightly against other areas of the circuit board 610. This ensures that the pre-compression force of the end cap assembly 400 can be evenly transmitted to the surface of the circuit board 610 through the elastic limiting pad 500, ensuring that the circuit board 610 is stably clamped between the elastic limiting pad 500 and the first support block 2211. This avoids problems such as the elastic limiting pad 500 being suspended due to local interference, resulting in insufficient or uneven clamping force.

[0043] In some preferred embodiments, please refer to Figure 4 The leads are not shown in the figure. The stator assembly 200 also includes a stator winding 230 and leads. The stator winding 230 is sleeved on the insulating structure 220 and electrically connected to the circuit board assembly 600. The leads are also electrically connected to the circuit board assembly 600. The insulating structure 220 covers the surface of the stator core 210, isolating the stator core 210 from the stator winding 230 and the circuit board assembly 600, preventing direct contact that could cause short circuits, leakage, or other electrical faults. An external power supply inputs electrical energy to the circuit board assembly 600 through the leads. The circuit board 610 controls the energizing phase sequence of the stator winding 230 based on the position signal of the rotor assembly 300 detected by the Hall sensor 620. After current is applied to the stator winding 230, a rotating magnetic field is generated, driving the rotor assembly 300 to rotate. The Hall sensor 620 continuously detects the magnetic pole position and feeds it back to the circuit board 610, forming a dynamic control closed loop to ensure the continuous and stable operation of the brushless motor.

[0044] In some preferred embodiments, the elastic limiting gasket 500 has a relief groove 503 for the relief lead. This prevents the elastic limiting gasket 500 from interfering with the lead, further ensuring a tight and elastic contact between the back cover 410, the elastic limiting gasket 500, and the circuit board 610.

[0045] In some more preferred embodiments, the outer peripheral wall of the stator core 210 is fitted against the inner wall of the accommodating cavity 101. This increases the connection area between the stator core 210 and the housing 100, which can limit the radial displacement of the stator assembly 200 and prevent the stator assembly 200 from swaying radially during brushless motor operation vibration or start-stop impact. At the same time, the tight radial fit can disperse the axial clamping force transmitted by the elastic limiting pad 500, reduce local stress concentration, and, together with the circumferential limiting effect of the friction pair, further improve the relative fixation reliability of the stator assembly 200 and the housing 100, and reduce the risk of displacement.

[0046] The brushless motor of this utility model has an elastic limiting gasket 500 disposed between the upper end face of the stator assembly 200 and the end cover assembly 400. The first abutting surface 510 is in tight elastic contact with the upper end face of the stator assembly 200, and the second abutting surface 520 is in tight elastic contact with the side of the end cover assembly 400 near the receiving cavity 101. The pre-compression formed by the pressing of the end cover assembly 400 ensures that the elastic limiting gasket 500 maintains a stable normal pressure to generate a continuous clamping force on the stator assembly 200. Combined with the high friction contact surface, it forms a glue-free mechanical lock for the stator assembly 200, preventing the stator assembly 200 from axial displacement and circumferential rotation relative to the housing 100. It also eliminates the need to wait for the glue to cure and eliminates the risk of failure caused by missed glue application.

[0047] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0048] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0049] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0050] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0051] Although the description of this utility model has been given in conjunction with the specific embodiments described above, it is obvious to those skilled in the art that many substitutions, modifications, and variations can be made based on the above description. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.

Claims

1. A brushless electric motor characterized by, include: The housing (100) has a receiving cavity (101) and an opening (102) communicating with the receiving cavity (101). The stator assembly (200) is installed within the accommodating cavity (101); Rotor assembly (300) is disposed on stator assembly (200); End cap assembly (400), covering the opening (102); and An elastic limiting gasket (500) is disposed between the stator assembly (200) and the end cap assembly (400). The elastic limiting gasket (500) has a first abutting surface (510) and a second abutting surface (520) that are opposite to each other. The first abutting surface (510) elastically abuts against the upper end surface of the stator assembly (200), and the second abutting surface (520) elastically abuts against the end cap assembly (400) to fix the stator assembly (200) in the receiving cavity (101).

2. The brushless motor of claim 1, wherein, It also includes a circuit board assembly (600), which is disposed between the stator assembly (200) and the elastic limiting gasket (500) and is electrically connected to the stator assembly (200), wherein the first abutting surface (510) elastically abuts against the circuit board assembly (600).

3. The brushless motor according to claim 2, characterized in that, The circuit board assembly (600) has solder joints (611), and the elastic limiting pad (500) has a clearance channel (501) on the side of the circuit board assembly (600) that avoids the solder joints (611).

4. The brushless motor of claim 1, wherein, The end cap assembly (400) includes a rear cover (410) with a recess (411) on the side facing away from the receiving cavity (101), and the elastic limiting gasket (500) extends with a boss (530) that cooperates with and limits the recess (411).

5. The brushless motor according to claim 2, characterized in that, The stator assembly (200) includes a stator core (210) and an insulating structure (220). The stator core (210) is installed in the accommodating cavity (101). The insulating structure (220) covers the stator core (210). The insulating structure (220) has a first end face (221) and a second end face (222) that are opposite to each other. The first end face (221) is provided with a first support block (2211) for supporting the circuit board assembly (600). The second end face (222) is provided with a second support block (2221) that supports the bottom of the housing (100).

6. The brushless motor according to claim 5, characterized in that, The circuit board assembly (600) has a snap-fit ​​hole (612), and the first end face (221) is also provided with a snap hook (2212), which snaps into the snap-fit ​​hole (612).

7. The brushless motor according to claim 6, characterized in that, The elastic limiting pad (500) has a clearance hole (502) for avoiding the hook (2212).

8. The brushless motor according to claim 5, characterized in that, The stator assembly (200) further includes a stator winding (230) and leads. The stator winding (230) is sleeved on the insulating structure (220) and electrically connected to the circuit board assembly (600). The leads are electrically connected to the circuit board assembly (600).

9. The brushless motor of claim 8, wherein, The elastic limiting gasket (500) has a relief groove (503) to avoid obstructing the lead wire.

10. The brushless motor of claim 5, wherein, The outer peripheral wall of the stator core (210) is attached to the inner wall of the accommodating cavity (101).

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