Brushless coreless motor

Abstract

The invention relates to the technical field of motors, and provides a brushless coreless motor, which comprises a shell, a stator assembly fixed on the shell and a rotor assembly supported on the shell and rotationally connected with the shell, and is characterized in that the stator assembly is arranged around the rotor assembly and is spaced from the rotor assembly; the brushless coreless motor further comprises a front cover and a support which are installed at the two ends of the shell respectively, a circuit board fixed to the side, away from the shell, of the support, and a wire outlet terminal fixed to the side, away from the shell, of the circuit board. The front cover and the shell are clamped through a first limiting structure and are welded and fixed at one end of the shell; the bracket and the shell are clamped through a second limiting structure and are pressed and fixed at the other end of the shell; the rotor assembly is rotationally connected with the front cover and the support. Compared with the prior art, the brushless coreless motor provided by the invention is simple in structure, is convenient to ensure that the wire outlet position of the motor is accurate and uniform, saves the cost, and improves the production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of motors, and in particular to a brushless coreless motor. Background Art

[0002] Brushless hollow cup motors have been widely used in the fields of motors and generators due to their compact structure, high power density, high working efficiency, and significant energy saving and consumption reduction benefits. In recent years, the industrial field has an increasingly urgent demand for equipment that uses brushless hollow cup motors to directly drive loads. The widespread application of these brushless hollow cup motor direct-drive equipment will produce immeasurable energy-saving benefits.

[0003] In the related art, most of the existing brushless hollow cup motors include a front cover, a rotor, a stator and a bracket wound at intervals on the rotor. The front cover and the bracket are respectively arranged at opposite ends of the stator, and the motor is driven by the stator and the rotor to rotate. The stator includes a shell fixed to the front cover and a winding fixed in the shell. The rotor generally includes a rotating shaft and a magnet fixed to the outer peripheral side of the rotating shaft. The motor is driven by the magnet and the winding to rotate. However, the existing front cover, bracket and shell are connected by threaded connection. The threaded connection cannot accurately locate the relative positions of the three. The limitations of this connection method lead to the deviation of the outlet position is not uniform; at the same time, only by adding additional clamps to assist in the precise adjustment of the motor outlet position will affect the position of the four fixing holes on the front cover of the motor, and ultimately the motor cannot be fixed, resulting in a poor user experience.

[0004] Therefore, it is necessary to provide a new brushless hollow cup motor to solve the above technical problems. Summary of the invention

[0005] The object of the present invention is to provide a brushless hollow cup motor with a simple structure, which is convenient for ensuring the accurate and uniform position of the motor output line, saving costs and improving production efficiency.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a brushless hollow cup motor, which includes a shell, a stator assembly fixed to the shell, and a rotor assembly supported by the shell and rotatably connected with the shell, the stator assembly is arranged around the rotor assembly and is spaced apart from the rotor assembly; the brushless hollow cup motor also includes a front cover and a bracket respectively installed at both ends of the shell, a circuit board fixed to a side of the bracket away from the shell, and an output terminal fixed to a side of the circuit board away from the shell; the front cover and the shell are clamped by a first limiting structure and are welded and fixed to one end of the shell, and the bracket and the shell are clamped by a second limiting structure and are crimped and fixed to the other end of the shell; the rotor assembly is rotatably connected with the front cover and the bracket respectively.

[0007] Preferably, the shell includes a shell body in the shape of a hollow column, an annular connecting portion formed by one end of the shell body extending radially inwardly, and a positioning hole formed through the connecting portion; the front cover includes a front cover body, an annular first boss formed by a protrusion extending from a side of the front cover body close to the shell, a second boss formed by a protrusion extending from a side of the first boss close to the shell, a positioning column formed by a protrusion extending from a side of the first boss close to the shell, and a through hole that passes through the second boss along the axial direction of the second boss; the side of the connecting portion close to the front cover abuts against the first boss, the inner side of the connecting portion is sleeved on the outer periphery of the second boss, and the positioning column is inserted and fixed in the positioning hole; the positioning hole and the positioning column together constitute the first limiting structure; the stator assembly is fixed to the inner side wall of the shell body, and one end of the rotor assembly is inserted in the through hole to form a rotating connection.

[0008] Preferably, the shell also includes a plurality of limiting grooves formed by the other end of the shell body being recessed along its axial direction and a limiting wall formed in each limiting groove and protruding and extending toward the bracket; the bracket includes a bracket body, an annular contact portion formed by the side of the bracket body protruding and extending away from the shell, a limiting protrusion formed by the outer peripheral side of the bracket body, and an avoidance groove formed by the outer peripheral side of the bracket body being recessed, the limiting protrusion and the avoidance groove being distributed along the circumference of the bracket body, and the limiting protrusion is located at the notch of the avoidance groove, the bracket body is inserted into one end of the shell body and fixed to the inner side wall of the shell body, the side of the contact portion close to the shell body abuts against the shell body, the limiting protrusion is arranged in the limiting groove, and the limiting wall is arranged in the avoidance groove; the limiting protrusion, the limiting groove, the limiting wall and the avoidance groove together constitute the second limiting structure; the other end of the rotor assembly is supported on the bracket body and forms a rotation connection.

[0009] Preferably, the bracket also includes at least two third bosses formed by protruding and extending from one 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 interval depressions of the circuit board body, and each of the third bosses is respectively arranged in one of the slot structures.

[0010] Preferably, the stator assembly includes a coil winding coaxially arranged with the housing and fixed to the housing.

[0011] Preferably, the rotor assembly includes a rotating shaft rotatably connected to the front cover and the bracket respectively, an iron core sleeved and fixed to the rotating shaft, and a permanent magnet sleeved and fixed to the iron core; the permanent magnet and the stator assembly are spaced apart from each other.

[0012] Preferably, the brushless coreless motor further comprises a first bearing, the first bearing is sleeved and fixed to one end of the rotating shaft close to the front cover, and the outer periphery of the first bearing is fixed in the front cover.

[0013] Preferably, the brushless coreless motor further comprises a second bearing, wherein the second bearing is sleeved on an end of the rotating shaft away from the front cover, and an outer periphery of the second bearing is fixed in the bracket.

[0014] Preferably, the brushless hollow cup motor also includes a sensor assembly, which is used to detect the rotation data of the rotating shaft. The sensor assembly includes a sensor magnet fixed on one end of the rotating shaft away from the second bearing and a Hall sensor fixed on a side of the circuit board close to the bracket; the Hall sensor is relatively spaced from the sensor magnet.

[0015] Preferably, the brushless hollow cup motor further comprises a protective cover, which is respectively mounted and fixed on the front cover and the outer shell; a relief position is provided on one side of the protective cover, and the output terminal on the circuit board is located in the relief position.

[0016] Compared with the prior art, in the brushless hollow cup motor of the present invention, the stator assembly is fixed in the shell, the stator assembly is arranged around the rotor assembly and is spaced from the rotor assembly, so that the rotor assembly is rotatably connected to the shell; the brushless hollow cup motor also includes a front cover and a bracket respectively installed at both ends of the shell, a circuit board fixed to the side of the bracket away from the shell, and an output terminal fixed to the side of the circuit board away from the shell; the front cover and the shell are clamped and welded to one end of the shell by a first limiting structure, and the bracket and the shell are clamped and crimped to the other end of the shell by a second limiting structure; the rotor assembly is rotatably connected to the front cover and the bracket respectively; the front cover and the shell are clamped and welded to the shell by the first limiting structure, and the bracket and the shell are clamped and crimped to the shell by the second limiting structure, so that the front cover, the shell, the bracket and the circuit board are designed with fool-proof features at specific positions to form a fool-proof feature chain, and jointly realize the unification of the motor output position; at the same time, it is integrated into the characteristics of the components themselves, simplifies the design of the clamp, reduces the use of the clamp, indirectly saves costs and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. 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 work, among which:

[0018] Figure 1 A schematic diagram of the three-dimensional structure of a brushless coreless motor provided in an embodiment of the present invention;

[0019] Figure 2 A three-dimensional structural exploded view of a brushless coreless motor provided by an embodiment of the present invention;

[0020] Figure 3 for Figure 1 AA line section view;

[0021] Figure 4 A schematic diagram of the structure of a housing provided by an embodiment of the present invention;

[0022] Figure 5 A schematic diagram of the structure of a bracket provided in an embodiment of the present invention.

[0023] Among them, 100, brushless hollow cup motor, 1, shell, 11, shell body, 12, connecting part, 13, limiting groove, 14, limiting wall, 15, positioning hole, 2, stator assembly, 3, rotor assembly, 31, permanent magnet, 32, iron core, 33, rotating shaft, 4, front cover, 41, front cover body, 42, first boss, 43, second boss, 44, positioning column, 45, through hole, 5, bracket, 51, bracket body, 52, contact part, 53, limiting protrusion, 54, avoidance groove, 55, third boss, 6, circuit board, 61, circuit board body, 62, notch structure, 7, outlet terminal, 8, first bearing, 9, second bearing, 10, sensor assembly, 101, sensor magnet, 102, Hall sensor, 20, protective cover, 201, avoidance position. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Combination Figures 1 to 5As shown, an embodiment of the present invention provides a brushless hollow cup motor 100, which includes a housing 1, a stator assembly 2 fixed to the housing 1, and a rotor assembly 3 supported by the housing 1 and rotatably connected to the housing 1, wherein the stator assembly 2 is arranged around the rotor assembly 3 and is spaced apart from the rotor assembly 3; the brushless hollow cup motor 100 also includes a front cover 4 and a bracket 5 respectively mounted at both ends of the housing 1, a circuit board 6 fixed to a side of the bracket 5 away from the housing 1, and an outlet terminal 7 fixed to a side of the circuit board 6 away from the housing 1; the front cover 4 is clamped with the housing 1 through a first limiting structure and is welded and fixed to one end of the housing 1, and the bracket 5 is clamped with the housing 1 through a second limiting structure and is crimped and fixed to the other end of the housing 1; the rotor assembly 3 is rotatably connected with the front cover 4 and the bracket 5 respectively.

[0026] The housing 1 is used to fix the stator assembly 2 and support the rotation of the rotor assembly 3. The mutual magnetic field generated by the stator assembly 2 and the rotor assembly 3 drives the rotor assembly 3 to rotate, thereby realizing the rotation of the entire motor.

[0027] Specifically, the stator assembly 2 is fixed in the housing 1, the stator assembly 2 is arranged around the rotor assembly 3 and is spaced from the rotor assembly 3, and the rotor assembly 3 is rotatably connected to the housing 1; the brushless hollow cup motor 100 also includes a front cover 4 and a bracket 5 respectively installed at both ends of the housing 1, a circuit board 6 fixed to the side of the bracket 5 away from the housing 1, and an outlet terminal 7 fixed to the side of the circuit board 6 away from the housing 1; the front cover 4 and the housing 1 are formed by a first limiting structure to form a snap-fit ​​and welded to one end of the housing 1, and the bracket 5 and the housing 1 are formed by a second limiting structure to form a snap-fit ​​and crimped fixed to the outer The other end of the shell 1; the rotor assembly 3 is rotatably connected with the front cover 4 and the bracket 5 respectively; the front cover 4 and the outer shell 1 are clamped and welded to fix the outer shell 1 through a first limiting structure, and the bracket 5 and the outer shell 1 are clamped and crimped to fix to the outer shell 1 through a second limiting structure, so that the front cover 4, the outer shell 1, the bracket 5 and the circuit board 6 are designed with fool-proof features at specific positions to form an fool-proof feature chain, and together realize the unification of the output position of the output terminal 7 of the motor; at the same time, it is integrated into the characteristics of the component itself, simplifies the design of the clamp, reduces the use of the clamp, indirectly saves costs and improves production efficiency.

[0028] In this embodiment, the housing 1 includes a housing body 11 in a hollow columnar shape, a ring-shaped connecting portion 12 formed by extending radially inwardly from one end of the housing body 11 , and a positioning hole 15 formed through the connecting portion 12 .

[0029] In this embodiment, the front cover 4 includes a front cover body 41, a first boss 42 formed by annularly extending from a side of the front cover body 41 close to the outer shell 1, a second boss 43 formed by extending from a side of the first boss 42 close to the outer shell 1, a positioning column 44 formed by protruding and extending from a side of the first boss 42 close to the outer shell 1, and a through hole 45 formed by axially penetrating the second boss 43 along the second boss 43; the side of the connecting portion 12 close to the front cover 4 abuts against the first boss 42, the inner side of the connecting portion 12 is sleeved on the outer periphery of the second boss 43, and the positioning column 44 is inserted and fixed in the positioning hole 15. The positioning hole 15 and the positioning column 44 together constitute the first limiting structure; the stator assembly 2 is fixed to the inner wall of the shell body 11, and the rotor assembly 3 is arranged in the through hole 45 to form a rotational connection; the first boss 42 of the front cover 4 is abutted against the end face of the shell 1, the second boss 43 is arranged in the shell 1, and the positioning column 44 is inserted into the positioning hole 15, so that the positioning column 44 and the positioning hole 15 form a fool-proof matching arrangement, thereby facilitating the assembly between the front cover 4 and the shell 1.

[0030] In this embodiment, the housing 1 further includes a plurality of limit grooves 13 formed by the depression of the circumferential side of the other end of the housing body 11 and a limit wall 14 formed by a protrusion extending from one side of each limit groove 13 close to the bracket 5. The front cover 4 is fixed to the connecting portion 12, the stator assembly 2 is fixed to the inner wall of the housing body 11, and the bracket 5 is arranged in the other end of the housing body 11 and is fixed by clamping with the limit wall 14. The housing body 11 is used to fix the stator assembly 2, and the connection portion 12 is welded and fixed to the front cover 4, so that the front cover 4 and the housing 1 are fixed as a whole. The limit grooves 13 and the limit wall 14 form a fool-proof feature connection with the bracket 5 to ensure that the motor outlet position is accurate and uniform.

[0031] In this embodiment, the bracket 5 includes a bracket body 51, an annular contact portion 52 formed by a protrusion extending from one side of the bracket body 51 away from the shell 1, a limiting protrusion 53 formed by a protrusion on the outer peripheral side of the bracket body 51, and an avoidance groove 54 formed by a depression on the outer peripheral side of the bracket body 51; the limiting protrusion 53 and the avoidance groove 54 are distributed along the circumference of the bracket body 51, and the limiting protrusion 53 is located at the notch of the avoidance groove 54, the bracket body 51 is inserted into one end of the shell body 11 and fixed to the inner side wall of the shell body 11, the side of the contact portion 52 close to the shell body 11 abuts against the shell body 11, the limiting protrusion 53 is arranged in the limiting groove 13, and the limiting wall 14 is arranged in the avoidance groove 54. The limiting protrusion 53, the limiting groove 13, the limiting wall 14 and the avoiding groove 54 together constitute the second limiting structure; the other end of the rotor assembly 3 is supported on the bracket body 51 and forms a rotation connection. By setting the limiting wall 14 in the avoiding groove 54, the limiting protrusion 53 is clamped in the limiting groove 13, and the limiting groove 13 and the limiting protrusion 53 are matched with each other to prevent mistakes. The limiting groove 13 and the limiting protrusion 53 are designed with anti-mistake features at specific positions to form an anti-mistake feature chain, and the motor outlet position is unified together.

[0032] Optionally, the limiting protrusion 53 is a limiting block or a limiting column, etc.

[0033] In this embodiment, the bracket 5 further includes at least two third bosses 55 formed by the bracket body 51 protruding and extending from one side away from the housing 1; the circuit board 6 includes a circuit board body 61 and at least two slot structures 62 formed by the circuit board body 61 being recessed at intervals, and each of the third bosses 55 is respectively arranged in one of the slot structures 62. The third bosses 55 and the slot structures 62 form a foolproof chain arrangement with each other, so that the mutual limiting effect between the bracket 5 and the circuit board 6 is good, which facilitates the outlet position of the outlet terminal 7 to be consistent with the direction of the front cover 4 and the limiting protrusion 53, and jointly realizes the uniformity of the motor outlet position.

[0034] In this embodiment, the stator assembly 2 is a coil winding coaxially arranged with the housing 1 and fixed to the housing 1. The coil winding and the rotor assembly 3 generate a magnetic field to drive the rotor assembly 3 to rotate.

[0035] In this embodiment, the rotor assembly 3 includes a rotating shaft 33 that is rotatably connected to the front cover 4 and the bracket 5, an iron core 32 sleeved and fixed to the rotating shaft 33, and a permanent magnet 31 sleeved and fixed to the iron core 32; the permanent magnet 31 is spaced from the stator assembly 2. The magnetic field generated by the stator assembly 2 and the permanent magnet 31 drives the rotating shaft 33 to rotate between the front cover 4 and the bracket 5, thereby achieving the motor rotation effect.

[0036] In this embodiment, the brushless hollow cup motor 100 further includes a first bearing 8, which is sleeved and fixed to one end of the rotating shaft 33 close to the front cover 4, and the outer periphery of the first bearing 8 is fixed in the front cover 4. The first bearing 8 reduces the friction between the rotating shaft 33 and the front cover 4, thereby improving the rotation efficiency of the rotating shaft 33.

[0037] In this embodiment, the brushless hollow cup motor 100 further includes a second bearing 9, which is sleeved on one end of the rotating shaft 33 away from the front cover 4, and the outer periphery of the second bearing 9 is fixed in the bracket 5. The rotating shaft 33 is supported by the second bearing 9 and arranged in the bracket 5, so that the rotation stability of both ends of the rotating shaft 33 is good.

[0038] In this embodiment, the brushless coreless motor 100 further includes a sensor assembly 10, which is used to detect the rotation data of the rotating shaft 33. The sensor assembly 10 includes a sensor magnet 101 sleeved and fixed to one end of the rotating shaft 33 away from the second bearing 9 and a Hall sensor 102 fixed to the side of the circuit board 6 close to the bracket 5; the Hall sensor 102 is relatively spaced from the sensor magnet 101. The rotation data of the rotating shaft 33 is collected by the sensor magnet 101, and the sensor magnet 101 and the Hall sensor 102 are mutually transmitted with signals, and the rotation data is processed by the Hall sensor 102, and the processed data is transmitted to an external device for display.

[0039] In this embodiment, the brushless hollow cup motor 100 further includes a protective cover 20, which is respectively sleeved and fixed on the front cover 4 and the housing 1; a side of the protective cover 20 is provided with an escape position 201, and the outlet terminal 7 on the circuit board 6 is located in the escape position 201, so as to facilitate the outlet terminal 7 to be wired out.

[0040] Compared with the prior art, in the brushless hollow cup motor of the present invention, the stator assembly is fixed in the shell, the stator assembly is arranged around the rotor assembly and is spaced from the rotor assembly, so that the rotor assembly is rotatably connected to the shell; the brushless hollow cup motor also includes a front cover and a bracket respectively installed at both ends of the shell, a circuit board fixed to the side of the bracket away from the shell, and an output terminal fixed to the side of the circuit board away from the shell; the front cover and the shell are clamped and welded to one end of the shell by a first limiting structure, and the bracket and the shell are clamped and crimped to the other end of the shell by a second limiting structure; the rotor assembly is rotatably connected to the front cover and the bracket respectively; the front cover and the shell are clamped and welded to the shell by the first limiting structure, and the bracket and the shell are clamped and crimped to the shell by the second limiting structure, so that the front cover, the shell, the bracket and the circuit board are designed with fool-proof features at specific positions to form a fool-proof feature chain, and jointly realize the unification of the motor output position; at the same time, it is integrated into the characteristics of the components themselves, simplifies the design of the clamp, reduces the use of the clamp, indirectly saves costs and improves production efficiency.

[0041] The above description is only an implementation mode of the present invention. It should be pointed out that, for ordinary technicians in this field, improvements can be made without departing from the creative concept of the present invention, but these all belong to the protection scope of the present invention.

Claims

1. A brushless hollow cup motor, comprising a housing, a stator assembly fixed to the housing, and a rotor assembly supported by the housing and rotatably connected to the housing, wherein the stator assembly is arranged around the rotor assembly and is spaced from the rotor assembly; characterized in that: The brushless hollow cup motor also includes a front cover and a bracket respectively installed at both ends of the shell, a circuit board fixed to the side of the bracket away from the shell, and an output terminal fixed to the side of the circuit board away from the shell; the front cover is clamped with the shell by a first limiting structure and is welded and fixed to one end of the shell, and the bracket is clamped with the shell by a second limiting structure and is crimped and fixed to the other end of the shell; the rotor assembly is rotationally connected with the front cover and the bracket respectively.

2. The brushless coreless motor according to claim 1, characterized in that: The shell includes a shell body in the shape of a hollow column, an annular connecting portion formed by one end of the shell body extending radially inwardly, and a positioning hole formed through the connecting portion; the front cover includes a front cover body, an annular first boss formed by a protrusion extending from a side of the front cover body close to the shell, a second boss formed by a protrusion extending from a side of the first boss close to the shell, a positioning column formed by a protrusion extending from a side of the first boss close to the shell, and a through hole that passes through the second boss along the axial direction of the second boss; the side of the connecting portion close to the front cover abuts against the first boss, the inner side of the connecting portion is sleeved on the outer periphery of the second boss, and the positioning column is inserted and fixed in the positioning hole; the positioning hole and the positioning column together constitute the first limiting structure; the stator assembly is fixed to the inner side wall of the shell body, and one end of the rotor assembly is inserted in the through hole to form a rotating connection.

3. The brushless coreless motor according to claim 2, characterized in that: The shell also includes a plurality of limiting grooves formed by the other end of the shell body being recessed along its axial direction and a limiting wall formed in each limiting groove and protruding and extending toward the bracket; the bracket includes a bracket body, an annular contact portion formed by the side of the bracket body protruding and extending away from the shell, a limiting protrusion formed by the outer peripheral side of the bracket body, and an avoidance groove formed by the outer peripheral side of the bracket body being recessed, the limiting protrusion and the avoidance groove are distributed along the circumference of the bracket body, and the limiting protrusion is located at the notch of the avoidance groove, the bracket body is inserted into one end of the shell body and fixed to the inner side wall of the shell body, the side of the contact portion close to the shell body is abutted against the shell body, the limiting protrusion is arranged in the limiting groove, and the limiting wall is arranged in the avoidance groove; the limiting protrusion, the limiting groove, the limiting wall and the avoidance groove together constitute the second limiting structure; the other end of the rotor assembly is supported on the bracket body and forms a rotation connection.

4. The brushless coreless motor according to claim 3, characterized in that: The bracket also includes at least two third bosses formed by the bracket body extending from one side away from the shell; the circuit board includes a circuit board body and at least two slot structures formed by the circuit board body being recessed at intervals, and each of the third bosses is respectively arranged in one of the slot structures.

5. The brushless coreless motor according to claim 1, characterized in that: The stator assembly includes a coil winding coaxially disposed with the housing and fixed to the housing.

6. The brushless coreless motor according to claim 1, characterized in that: The rotor assembly comprises a rotating shaft which is rotatably connected with the front cover and the bracket respectively, an iron core which is sleeved and fixed on the rotating shaft, and a permanent magnet which is sleeved and fixed on the iron core; the permanent magnet and the stator assembly are spaced apart from each other.

7. The brushless coreless motor according to claim 6, characterized in that: The brushless coreless motor further comprises a first bearing, which is sleeved and fixed to one end of the rotating shaft close to the front cover, and the outer periphery of the first bearing is fixed in the front cover.

8. The brushless coreless motor according to claim 6, characterized in that: The brushless coreless motor further comprises a second bearing, wherein the second bearing is sleeved on an end of the rotating shaft away from the front cover, and an outer periphery of the second bearing is fixed in the bracket.

9. The brushless coreless motor according to claim 6, characterized in that: The brushless hollow cup motor also includes a sensor assembly, which is used to detect the rotation data of the rotating shaft. The sensor assembly includes a sensor magnet fixed on one end of the rotating shaft away from the second bearing and a Hall sensor fixed on a side of the circuit board close to the bracket; the Hall sensor is relatively spaced from the sensor magnet.

10. The brushless coreless motor according to claim 1, characterized in that: The brushless hollow cup motor also includes a protective cover, which is respectively sleeved and fixed on the front cover and the shell; a relief position is provided on one side of the protective cover, and the output terminal on the circuit board is located in the relief position.

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