Brushless electric motor

Abstract

The present invention relates to the technical field of electric motors. Provided is a brushless electric motor, comprising a housing, a front cover, a support, a stator assembly, a rotor assembly, a circuit board fixed to the side of the support away from the housing, and a sensor assembly, wherein the stator assembly surrounds the rotor assembly and is spaced apart from the rotor assembly; the rotor assembly comprises a rotating shaft and a permanent magnet sleeved on and fixed to the rotating shaft, the rotating shaft comprising a rotating shaft body, which is rotationally connected to the front cover and the support, and two parallel flat portions recessed from the peripheral side of the rotating shaft body; the sensor assembly comprises a sensor steel magnet and a Hall sensor, the sensor steel magnet comprising a steel magnet body and a fixing hole running through the steel magnet body; the flat portions are inserted and fixed in the fixing hole; and the direction of the magnetization of the permanent magnet is perpendicular to the flat portions, and the direction of the magnetization of the sensor steel magnet is perpendicular to the flat portions. Compared with the prior art, the directions of main and auxiliary magnetic fields of the brushless electric motor of the present invention are consistent, and therefore the detection precision of rotational data is high, and the torque performance is good.

Description

brushless motor Technical Field

[0001] This invention relates to the field of motor technology, and more particularly to a brushless hollow cup motor. Background Technology

[0002] Brushless motors, due to their compact structure, high power density, high efficiency, and significant energy-saving benefits, have been widely used in electric motors and generators. In recent years, the industrial sector has seen an increasingly urgent demand for equipment that directly drives loads using brushless motors. The widespread application of these brushless motor direct-drive devices will generate immeasurable energy-saving benefits. Technical issues

[0003] In related technologies, most existing brushless motors include a front cover, a rotor, a stator wound at intervals around the rotor, a support, and a sensor assembly. The front cover and the support are respectively located at opposite ends of the stator, and the motor rotation is achieved by the mutual drive between the stator and the rotor. The stator includes a housing fixed to the front cover and windings fixed inside the housing. The rotor generally includes a shaft and magnets fixed to the outer periphery of the shaft, and the motor rotation is achieved by the mutual drive between the magnets and the windings. The sensor assembly includes a sensor magnet fixed to the shaft and a Hall sensor fixed to the support, with the Hall sensor and the sensor magnet arranged opposite each other. However, in existing models, the sensor magnet and the shaft have rounded ends, which makes the directions of the main magnetic field and the secondary magnetic field not fixed, resulting in arbitrary angle settings of the magnetic field. This easily leads to the problem of random interference between the main magnetic field and the secondary magnetic field, causing large fluctuations in the detection accuracy and calibration accuracy of the Hall sensor. At the same time, there is also the problem of random interference between the secondary magnetic field and the main magnetic field, resulting in large fluctuations in the torque performance of the motor.

[0004] Therefore, it is necessary to provide a new brushless motor to solve the above-mentioned technical problems. Technical solutions

[0005] The purpose of this invention is to provide a brushless motor with consistent main and auxiliary magnetic field directions, high accuracy in rotation data detection, and good torque performance.

[0006] To achieve the above objectives, the present invention provides a brushless motor, comprising a housing, a front cover and a bracket respectively mounted at both ends of the housing, a stator assembly fixed to the inner side of the housing, a rotor assembly supported at both ends by the front cover and the bracket and forming a rotatable connection, a circuit board fixed to the side of the bracket away from the housing, and a sensor assembly; the stator assembly is arranged around the rotor assembly and spaced apart from the rotor assembly;

[0007] The rotor assembly includes a rotating shaft and a permanent magnet sleeved and fixed to the rotating shaft; the rotating shaft is rotatably connected to the front cover and the bracket respectively, and the permanent magnet is spaced apart from the stator assembly; the rotating shaft includes a rotating shaft body rotatably connected to the front cover and the bracket respectively, and two parallel flat portions formed by recesses on the outer periphery of the rotating shaft body near the circuit board.

[0008] The sensor assembly includes a sensor magnet sleeved and fixed to the end of the rotating shaft away from the front cover and a Hall sensor fixed to the side of the circuit board near the bracket; the Hall sensor is spaced apart from the sensor magnet and located within the magnetic field range of the sensor magnet; the sensor magnet includes a magnet body and a fixing hole formed through the magnet body; the shape of the fixing hole matches the switch at the end of the rotating shaft body near the circuit board, and the flat portion is inserted and fixed in the fixing hole;

[0009] The magnetization direction of the permanent magnet is perpendicular to the flat portion, and the magnetization direction of the sensor magnet is perpendicular to the flat portion.

[0010] Preferably, the fixing hole includes two flat edges arranged opposite each other and two arc-shaped sidewalls respectively connecting the same end of the two flat edges, and the two flat portions are attached to the two flat edges.

[0011] Preferably, the outer periphery of the magnet body forms two relatively parallel straight edges and two arc-shaped edges that connect the same end of the two straight edges respectively, and the straight edges are perpendicular to the flat portion.

[0012] Preferably, the outer casing includes a hollow cylindrical outer casing body, an annular connecting portion extending radially inward from one end of the outer casing body, and a positioning hole penetrating the connecting portion; the front cover includes a front cover body, an annular first boss protruding from the side of the front cover body near the outer casing, a second boss protruding from the side of the first boss near the outer casing, a positioning post protruding from the side of the first boss near the outer casing, and a through hole penetrating the second boss along its axial direction; the connecting portion abuts against the first boss on the side near the front cover, the inner side of the connecting portion is sleeved on the outer periphery of the second boss, and the positioning post is inserted and fixed in the positioning hole; the stator assembly is fixed to the inner wall of the outer casing body, and one end of the rotor assembly is inserted into the through hole and forms a rotatable connection.

[0013] Preferably, the outer casing further includes a plurality of limiting grooves formed by a recess in the other end of the outer casing body along its axial direction, and limiting walls formed in each of the limiting grooves and extending protruding towards the support; the support includes a support body, an annular contact portion extending protruding from the side of the support body away from the outer casing, a limiting protrusion formed protruding from the outer periphery of the support body, and a clearance groove formed by a recess in the outer periphery of the support body. The limiting protrusion and the clearance groove are distributed circumferentially along the support body, and the limiting protrusion is located at the opening of the clearance groove. The support body is inserted into one end of the outer casing body and fixed to the inner wall of the outer casing body. The contact portion abuts against the outer casing body on the side near the outer casing body. The limiting protrusion is disposed in the limiting groove, and the limiting wall is disposed in the clearance groove. The other end of the rotor assembly is supported on the support body and forms a rotatable connection.

[0014] Preferably, the bracket further includes at least two third protrusions extending from the side of the bracket body away from the outer shell; the circuit board includes a circuit board body and at least two slot structures formed by the recesses of the circuit board body at intervals, and each of the third protrusions is respectively disposed in one of the slot structures.

[0015] Preferably, the stator assembly includes a coil winding that is coaxially arranged with and fixed to the housing.

[0016] Preferably, the brushless motor further includes a first bearing, which is sleeved and fixed to one end of the shaft near the front cover, and the outer periphery of the first bearing is fixed inside the front cover.

[0017] Preferably, the brushless motor further includes a second bearing, which is sleeved on the end of the shaft away from the front cover, and the outer periphery of the second bearing is fixed inside the bracket.

[0018] Preferably, the rotor assembly further includes an iron core, which is sleeved and fixed between the rotating shaft and the permanent magnet. Beneficial effects

[0019] Compared with the prior art, in the brushless motor of the present invention, the stator assembly is fixed inside the housing, the stator assembly is arranged around the rotor assembly and spaced apart from the rotor assembly, and the rotor assembly is rotatably connected to the housing; the permanent magnet is spaced apart from the stator assembly; the rotating shaft includes a rotating shaft body that is rotatably connected to the front cover and the bracket respectively, and two parallel flat portions formed by recesses on the outer periphery of the rotating shaft body near the circuit board; a sensor magnet is fixed to the rotating shaft, and a Hall sensor is fixed to the circuit board and located within the magnetic field range of the sensor magnet; the sensor magnet includes a magnet body and a core extending through the magnet body. A fixing hole is provided; the shape of the fixing hole matches the switch at the end of the rotating shaft body near the circuit board, and the flat part is inserted and fixed in the fixing hole; the magnetization direction of the permanent magnet is perpendicular to the flat part, and the magnetization direction of the sensor magnet is perpendicular to the flat part; in this way, by using a double flat fit between the sensor magnet and the rotating shaft, and with the magnetization direction of the permanent magnet perpendicular to the flat part, the rotor assembly is first assembled, and then magnetized; the magnetic field direction of the sensor magnet is perpendicular to the flat part. The design of the flat part ensures the consistency of the directions of the main and auxiliary magnetic fields, and the mutual interference of the main and auxiliary magnetic fields tends to be consistent, which is beneficial to improving the detection and calibration accuracy of the Hall sensor and the torque performance of the motor. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0021] Figure 1 is a three-dimensional structural diagram of the brushless motor provided in an embodiment of the present invention;

[0022] Figure 2 is an exploded three-dimensional view of the brushless motor provided in an embodiment of the present invention;

[0023] Figure 3 is a cross-sectional view along line AA in Figure 1;

[0024] Figure 4 is a schematic diagram of the outer shell provided in an embodiment of the present invention;

[0025] Figure 5 is a schematic diagram of the structure of the bracket provided in an embodiment of the present invention;

[0026] Figure 6 is a cross-sectional view along line BB in Figure 1;

[0027] Figure 7 is a magnified view of part C in Figure 6.

[0028] Among them, 100 is a brushless motor; 1 is a housing; 11 is the housing body; 12 is a connecting part; 13 is a limiting groove; 14 is a limiting wall; 15 is a positioning hole; 2 is a stator assembly; 3 is a rotor assembly; 31 is a permanent magnet; 32 is an iron core; 33 is a rotating shaft; 331 is a rotating shaft body; 332 is a flat part; 4 is a front cover; 41 is a front cover body; 42 is a first boss; 43 is a second boss; 44 is a positioning post; 45 is a through hole; 5 is a bracket; 51 is a bracket body; 5 2. Contact part; 53. Limiting protrusion; 54. Clearance groove; 55. Third protrusion; 6. Circuit board; 61. Circuit board body; 62. Slot structure; 7. Outgoing terminal; 8. First bearing; 9. Second bearing; 10. Sensor assembly; 101. Sensor magnet; 1011. Magnet body; 10111. Arc edge; 10112. Straight edge; 1012. Fixing hole; 10121. Flat edge; 10122. Side wall; 102. Hall sensor. Embodiments of the present invention

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Referring to Figures 1 to 7, this embodiment of the invention provides a brushless motor 100, which includes a housing 1, a front cover 4 and a bracket 5 respectively installed at both ends of the housing 1, a stator assembly 2 fixed to the inner side of the housing 1, a rotor assembly 3 respectively supported by the front cover 4 and the bracket 5 and forming a rotatable connection, a circuit board 6 fixed to the side of the bracket 5 away from the housing 1, and a sensor assembly 10. The stator assembly 2 is arranged around the rotor assembly 3 and spaced apart from the rotor assembly 3.

[0031] In this embodiment, a wire output terminal 7 is fixed on the side of the circuit board 6 away from the outer casing. The wire output terminal 7 is used to connect to an external power source to provide power.

[0032] The rotor assembly 3 includes a rotating shaft 33 and a permanent magnet 31 sleeved and fixed to the rotating shaft 33; the rotating shaft 33 is rotatably connected to the front cover 4 and the bracket 5 respectively, and the permanent magnet 31 is spaced apart from the stator assembly 2; the rotating shaft 33 includes a rotating shaft body 331 rotatably connected to the front cover 4 and the bracket 5 respectively, and two parallel flat portions 332 formed by recesses on the outer periphery of the rotating shaft body 331 near the circuit board 6 respectively.

[0033] The sensor assembly 10 includes a sensor magnet 101 sleeved and fixed to the end of the rotating shaft 33 away from the front cover 4, and a Hall sensor 102 fixed to the side of the circuit board 6 near the bracket 5. The Hall sensor 102 is spaced apart from the sensor magnet 101 and located within the magnetic field range of the sensor magnet 101. The sensor magnet 101 includes a magnet body 1011 and a fixing hole 1012 formed through the magnet body 1011. The shape of the fixing hole 1012 matches the switch at the end of the rotating shaft body 331 near the circuit board 6, and the flat portion 332 is inserted and fixed in the fixing hole 1012. The magnetization direction of the permanent magnet 31 is perpendicular to the flat portion 332, and the magnetization direction of the sensor magnet 101 is perpendicular to the flat portion 332. By using a double-flat fit between the sensor magnet 101 and the rotating shaft 33, and with the magnetization direction of the permanent magnet 31 perpendicular to the flat part 332, the rotor assembly 3 is assembled first and then magnetized. The magnetic field direction of the sensor magnet 101 is perpendicular to the flat part 332. The design of the flat part 332 ensures the consistency of the directions of the main and auxiliary magnetic fields, and the mutual interference between the main and auxiliary magnetic fields tends to be consistent, which is beneficial to improving the detection and calibration accuracy of the Hall sensor and the torque performance of the motor.

[0034] In this embodiment, the fixing hole 1012 includes two flat edges 10121 arranged opposite to each other and two arc-shaped sidewalls 10122 respectively connecting the same end of the two flat edges 10121. The two flat portions 332 fit into the two flat edges 10121.

[0035] The outer casing 1 is used to fix the stator assembly 2 and support the rotation of the rotor assembly 3. The rotor assembly 3 is driven to rotate by the mutual magnetic field generated by the stator assembly 2 and the rotor assembly 3, so as to realize the rotation of the whole motor.

[0036] In this embodiment, the outer periphery of the magnet body 1011 has two relatively parallel straight edges 10112 and two arc-shaped edges 10111 respectively connecting the same end of the two straight edges 10112. The straight edges 10112 are perpendicular to the flat portion 332. This facilitates the assembly of the magnet body 1011 and the rotating shaft 33.

[0037] In this embodiment, the outer shell 1 includes a hollow columnar outer shell body 11, an annular connecting portion 12 extending radially inward from one end of the outer shell body 11, and a positioning hole 15 formed through the connecting portion 12.

[0038] In this embodiment, the front cover 4 includes a front cover body 41, a first protrusion 42 extending annularly from the side of the front cover body 41 near the outer shell 1, a second protrusion 43 extending from the side of the first protrusion 42 near the outer shell 1, a positioning post 44 protruding from the side of the first protrusion 42 near the outer shell 1, and a through hole 45 formed by penetrating the second protrusion 43 along the axial direction of the second protrusion 43; the connecting part 12 abuts against the first protrusion 42 on the side near the front cover 4, the inner side of the connecting part 12 is sleeved on the outer periphery of the second protrusion 43, and the positioning post 44 is inserted and fixed in the positioning hole 15. The stator assembly 2 is fixed to the inner wall of the outer shell body 11, and the rotor assembly 3 is disposed in the through hole 45 and forms a rotatable connection; the first boss 42 of the front cover 4 abuts against the end face of the outer shell 1, the second boss 43 is disposed in the outer shell 1, and the positioning pin 44 is inserted into the positioning hole 15, so that the positioning pin 44 and the positioning hole 15 form a foolproof fit, thereby facilitating the assembly between the front cover 4 and the outer shell 1.

[0039] In this embodiment, the outer casing 1 further includes a plurality of limiting grooves 13 formed by a recess on the periphery of the other end of the outer casing body 11, and a limiting wall 14 extending from the side of each limiting groove 13 near the bracket 5. The front cover 4 is fixed to the connecting part 12, the stator assembly 2 is fixed to the inner sidewall of the outer casing body 11, and the bracket 5 is disposed in the other end of the outer casing body 11 and is snapped and fixed with the limiting wall 14. The stator assembly 2 is fixedly installed through the outer casing body 11, and is welded and fixed to the front cover 4 through the connecting part 12, so that the front cover 4 and the outer casing 1 are well fixed as a whole.

[0040] In this embodiment, the bracket 5 includes a bracket body 51, an annular contact portion 52 extending from the side of the bracket body 51 away from the outer shell 1, a limiting protrusion 53 protruding from the outer periphery of the bracket body 51, and a relief groove 54 recessed from the outer periphery of the bracket body 51. The limiting protrusion 53 and the relief groove 54 are distributed circumferentially along the bracket body 51, and the limiting protrusion 53 is located at the opening of the relief groove 54. The bracket body 51 is inserted into one end of the outer shell body 11 and fixed to the inner wall of the outer shell body 11. The contact portion 52 abuts against the outer shell body 11 on the side near the outer shell body 11. The limiting protrusion 53 is disposed in the limiting groove 13, and the limiting wall 14 is disposed in the relief groove 54. The other end of the rotor assembly 3 is supported on the bracket body 51 and forms a rotatable connection. By setting the limiting wall 14 in the clearance groove 54, the limiting protrusion 53 is locked in the limiting groove 13, thus achieving a foolproof fit between the limiting groove 13 and the limiting protrusion 53.

[0041] Optionally, the limiting protrusion 53 can be a limiting block or a limiting post, etc.

[0042] In this embodiment, the bracket 5 further includes at least two third protrusions 55 extending from the side of the bracket body 51 away from the outer shell 1; the circuit board 6 includes a circuit board body 61 and at least two slot structures 62 formed by recesses in the circuit board body 61 at intervals, with each third protrusion 55 disposed within one of the slot structures 62. The third protrusions 55 and the slot structures 62 form a foolproof chain, resulting in good mutual positioning between the bracket 5 and the circuit board 6, facilitating the alignment of the wire exit position of the terminal 7 with the direction of the front cover 4 and the limiting protrusion 53, thus achieving uniformity in the motor wire exit position.

[0043] In this embodiment, the stator assembly 2 includes a coil winding coaxially disposed and fixed to the housing 1. The coil winding can be a plurality of magnetic sheets stacked in a ring. By energizing the coil winding, the coil winding and the rotor assembly 3 generate a magnetic field to drive the rotor assembly 3 to rotate.

[0044] In this embodiment, the brushless motor 100 further includes a first bearing 8, which is sleeved and fixed to one end of the rotating shaft 33 near the front cover 4, with its outer periphery fixed inside the front cover 4. The first bearing 8 reduces the friction between the rotating shaft 33 and the front cover 4, thereby improving the rotational efficiency of the rotating shaft 33.

[0045] In this embodiment, the brushless motor 100 further includes a second bearing 9, which is sleeved on the end of the rotating shaft 33 away from the front cover 4, and the outer periphery of the second bearing 9 is fixed inside the bracket 5. The second bearing 9 supports the rotating shaft 33 within the bracket 5, ensuring good rotational stability at both ends of the rotating shaft 33.

[0046] In this embodiment, the rotor assembly 3 further includes an iron core 32, which is sleeved and fixed between the rotating shaft 33 and the permanent magnet 31. By adding the iron core 32, the magnetism of the permanent magnet 31 can be improved, thereby improving the performance of the brushless motor 100.

[0047] Compared with the prior art, in the brushless motor of the present invention, the stator assembly is fixed inside the housing, the stator assembly is arranged around the rotor assembly and spaced apart from the rotor assembly, and the rotor assembly is rotatably connected to the housing; the permanent magnet is spaced apart from the stator assembly; the rotating shaft includes a rotating shaft body that is rotatably connected to the front cover and the bracket respectively, and two parallel flat portions formed by recesses on the outer periphery of the rotating shaft body near the circuit board; a sensor magnet is fixed to the rotating shaft, and a Hall sensor is fixed to the circuit board and located within the magnetic field range of the sensor magnet; the sensor magnet includes a magnet body and a core extending through the magnet body. A fixing hole is provided; the shape of the fixing hole matches the switch at the end of the rotating shaft body near the circuit board, and the flat part is inserted and fixed in the fixing hole; the magnetization direction of the permanent magnet is perpendicular to the flat part, and the magnetization direction of the sensor magnet is perpendicular to the flat part; in this way, by using a double flat fit between the sensor magnet and the rotating shaft, and with the magnetization direction of the permanent magnet perpendicular to the flat part, the rotor assembly is first assembled, and then magnetized; the magnetic field direction of the sensor magnet is perpendicular to the flat part. The design of the flat part ensures the consistency of the directions of the main and auxiliary magnetic fields, and the mutual interference of the main and auxiliary magnetic fields tends to be consistent, which is beneficial to improving the detection and calibration accuracy of the Hall sensor and the torque performance of the motor.

[0048] The above description is merely an embodiment of the present invention. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements all fall within the protection scope of the present invention.

Claims

1. A brushless motor, comprising a housing, a front cover and a bracket respectively mounted at both ends of the housing, a stator assembly fixed to the inner side of the housing, a rotor assembly supported at both ends by the front cover and the bracket and forming a rotatable connection, a circuit board fixed to the side of the bracket away from the housing, and a sensor assembly; the stator assembly is arranged around the rotor assembly and spaced apart from the rotor assembly; characterized in that, The rotor assembly includes a rotating shaft and a permanent magnet sleeved and fixed to the rotating shaft; the rotating shaft is rotatably connected to the front cover and the bracket respectively, and the permanent magnet is spaced apart from the stator assembly; the rotating shaft includes a rotating shaft body rotatably connected to the front cover and the bracket respectively, and two parallel flat portions formed by recesses on the outer periphery of the rotating shaft body near the circuit board. The sensor assembly includes a sensor magnet sleeved and fixed to the end of the rotating shaft away from the front cover and a Hall sensor fixed to the side of the circuit board near the bracket; the Hall sensor is spaced apart from the sensor magnet and located within the magnetic field range of the sensor magnet; the sensor magnet includes a magnet body and a fixing hole formed through the magnet body; the shape of the fixing hole matches the switch at the end of the rotating shaft body near the circuit board, and the flat portion is inserted and fixed in the fixing hole; The magnetization direction of the permanent magnet is perpendicular to the flat portion, and the magnetization direction of the sensor magnet is perpendicular to the flat portion.

2. The brushless motor according to claim 1, characterized in that, The fixing hole includes two flat edges arranged opposite each other and two arc-shaped sidewalls respectively connected to the same end of the two flat edges, and the two flat parts are attached to the two flat edges.

3. The brushless motor according to claim 2, characterized in that, The outer periphery of the magnet body forms two relatively parallel straight edges and two arc-shaped edges that connect the same end of the two straight edges respectively, and the straight edges are perpendicular to the flat portion.

4. The brushless motor according to claim 1, characterized in that, The outer casing includes a hollow cylindrical outer casing body, an annular connecting portion extending radially inward from one end of the outer casing body, and a positioning hole penetrating the connecting portion; the front cover includes a front cover body, an annular first boss protruding from the side of the front cover body near the outer casing, a second boss protruding from the side of the first boss near the outer casing, a positioning post protruding from the side of the first boss near the outer casing, and a through hole penetrating the second boss along its axial direction; the connecting portion abuts against the first boss on the side near the front cover, the inner side of the connecting portion is sleeved on the outer periphery of the second boss, and the positioning post is inserted and fixed in the positioning hole; the stator assembly is fixed to the inner wall of the outer casing body, and one end of the rotor assembly is inserted into the through hole and forms a rotatable connection.

5. The brushless motor according to claim 2, characterized in that, The outer casing further includes a plurality of limiting grooves formed by a recess in the other end of the outer casing body along its axial direction, and limiting walls formed in each of the limiting grooves and extending protruding towards the support; the support includes a support body, an annular contact portion extending protruding from the side of the support body away from the outer casing, a limiting protrusion formed protruding from the outer periphery of the support body, and a clearance groove formed by a recess in the outer periphery of the support body. The limiting protrusion and the clearance groove are distributed circumferentially along the support body, and the limiting protrusion is located at the opening of the clearance groove. The support body is inserted into one end of the outer casing body and fixed to the inner sidewall of the outer casing body. The contact portion abuts against the outer casing body on the side near the outer casing body. The limiting protrusion is disposed in the limiting groove, and the limiting wall is disposed in the clearance groove; the other end of the rotor assembly is supported on the support body and forms a rotatable connection.

6. The brushless motor according to claim 5, characterized in that, The bracket further includes at least two third protrusions extending from the side of the bracket body away from the outer shell; the circuit board includes a circuit board body and at least two slot structures formed by the recesses of the circuit board body at intervals, and each of the third protrusions is respectively disposed in one of the slot structures.

7. The brushless motor according to claim 1, characterized in that, The stator assembly includes coil windings that are coaxially arranged with and fixed to the housing.

8. The brushless motor according to claim 1, characterized in that, The brushless motor also includes a first bearing, which is sleeved and fixed to one end of the shaft near the front cover, and the outer periphery of the first bearing is fixed inside the front cover.

9. The brushless motor according to claim 8, characterized in that, The brushless motor also includes a second bearing, which is sleeved on the end of the shaft away from the front cover, and the outer periphery of the second bearing is fixed inside the bracket.

10. The brushless motor according to claim 1, characterized in that, The rotor assembly also includes an iron core, which is sleeved and fixed between the rotating shaft and the permanent magnet.

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