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 and a rotor assembly, and the stator assembly and the rotor assembly are fixed to the inner circumferential side of the shell. The shell comprises a first cover plate, a second cover plate and a hollow shell body clamped between the cover plates; the stator assemblies are fixed on the inner peripheral side of the shell body and are arranged at intervals around the outer peripheral side of the rotor assembly; the rotor assembly is supported on the first cover plate and the second cover plate and is rotationally connected; the brushless coreless motor further comprises a hollow machine shell, the machine shell is arranged on the peripheral side of the shell in a sleeving mode, the machine shell and the first cover plate jointly form a containing space for containing the second cover plate, the shell body, the stator assembly and the rotor assembly, a positioning groove is further formed in the end, close to the first cover plate, of the machine shell, and a positioning block is arranged on the side, close to the machine shell, of the first cover plate. And the positioning blocks are embedded into the positioning grooves. Compared with the prior art, on the premise that the anti-rotation function of the motor is stable, the interchangeability of parts is higher, and the motor parts are easy to reuse.

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 housing, a rotor, and a stator wound around the rotor at intervals, and the motor shape is set by an external protective shell for easy use. However, the motor and the protective shell of the existing brushless hollow cup motor are fixed mainly by crimping or gluing to achieve the anti-rotation function. These two fixing methods are in the motor vibration environment for a long time, are easy to loosen, and have low reliability. Among them, the crimping method requires a higher consistency in the matching dimensions of the parts, which poses a great challenge to part processing and cost control; the gluing method requires the glue storage gap to be uniform and consistent, the gluing process is complicated, the glue used is costly, and the consistency requirements of the matching dimensions of the parts are high, which poses a great challenge to cost control. Both fixing methods are difficult to disassemble, the interchangeability of parts is reduced, and it is not conducive to the reuse of some parts.

[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 coreless motor which is easy to install and has a stable anti-rotation function.

[0006] In order to achieve the above object, the present invention provides a brushless hollow cup motor, which includes a housing, a stator assembly fixed to the inner circumference of the housing, and a rotor assembly supported by the housing and forming a rotation connection;

[0007] The housing comprises a first cover plate, a second cover plate and a hollow housing body sandwiched between the first cover plate and the second cover plate;

[0008] The stator assembly is fixed to the inner circumference of the housing body and is spaced around the outer circumference of the rotor assembly;

[0009] Two ends of the rotor assembly are respectively supported on the first cover plate and the second cover plate, and are rotatably connected with the first cover plate and the second cover plate;

[0010] The brushless coreless motor further comprises a casing with a hollow structure, wherein the casing is sleeved on the outer peripheral side of the shell and an open end thereof abuts against the first cover plate, and the casing and the first cover plate together enclose a receiving space for receiving the second cover plate, the shell body, the stator assembly and the rotor assembly;

[0011] One end of the housing close to the first cover plate is further provided with a positioning groove recessed toward the second cover plate, and one side of the first cover plate close to the housing is provided with a positioning block protruding toward the second cover plate, and the positioning block is embedded in the positioning groove.

[0012] Furthermore, a plurality of first fixing holes are provided at one end of the casing close to the first cover plate, and a plurality of second fixing holes corresponding to the first fixing holes are provided through the first cover plate along the axial direction of the rotor assembly, and screws are extended through the second fixing holes to the first fixing holes to lock and fix the first cover plate and the casing.

[0013] Furthermore, the first cover plate includes a cover plate body covering the open end of the casing and a fixing ring formed by protruding and extending from one side of the cover plate body close to the casing, the positioning block is formed on the cover plate body and is located on the outer peripheral side of the fixing ring, the second fixing holes are opened on the periphery of the cover plate body and are spaced around the fixing ring; the fixing ring is inserted into the open end of the casing.

[0014] Furthermore, the brushless hollow cup motor also includes a first bearing and a second bearing, a groove is provided on the side of the second cover plate close to the first cover plate, the outer peripheral side of the first bearing is fixed to the inner side of the fixing ring, and the outer peripheral side of the second bearing is fixed in the groove; the two ends of the rotor assembly are respectively inserted and fixed to the inner peripheral side of the first bearing and the inner peripheral side of the second bearing.

[0015] Furthermore, the stator assembly includes a coil coaxially arranged with the housing and fixed to the inner circumference of the housing.

[0016] Furthermore, the rotor assembly includes a rotating shaft which is rotationally connected to the first cover plate and the second cover plate respectively, a rotor magnetic ring which is sleeved and fixed on the rotating shaft, and a rotor magnetic steel which is sleeved and fixed on the rotor magnetic ring.

[0017] Furthermore, the brushless coreless motor further comprises a circuit board, the circuit board is fixed to a side of the second cover plate away from the first cover plate, and the circuit board is provided with an output terminal.

[0018] Furthermore, a through hole is provided on one side of the housing, and a wire connected to the outlet terminal extends to the outside of the housing through the through hole.

[0019] Furthermore, the brushless hollow cup motor also includes a sensor assembly, which is used to detect the rotation data of the rotor assembly. The sensor assembly includes a sensor magnet fixed on one end of the rotor assembly away from the second bearing and a Hall sensor fixed on a side of the circuit board close to the second cover plate; the Hall sensor and the sensor magnet are arranged relative to each other.

[0020] Compared with the prior art, the brushless hollow cup motor of the present invention comprises a housing, a stator assembly fixed to the inner circumference of the housing, and a rotor assembly supported by the housing and rotatably connected; the housing comprises a first cover plate, a second cover plate, and a hollow housing body sandwiched between the first cover plate and the second cover plate; the stator assembly is fixed to the inner circumference of the housing body and is arranged at intervals around the outer circumference of the rotor assembly; the two ends of the rotor assembly are respectively supported by the first cover plate and the second cover plate, and are rotatably connected with the first cover plate and the second cover plate; the brushless hollow cup motor also comprises a casing with a hollow structure, the casing is sleeved on the outer circumference of the housing and its open end abuts against the first cover plate, the casing and the first cover plate together enclose a receiving space for receiving the second cover plate, the housing body, the stator assembly and the rotor assembly; the end of the casing close to the first cover plate is also provided with a positioning groove formed by being recessed in the direction of the second cover plate, and the side of the first cover plate close to the casing is provided with a positioning block formed by protruding in the direction of the second cover plate, and the positioning block is embedded in the positioning groove. In the above structure, the protective shell and the motor part are easy to assemble and disassemble. Under the premise of ensuring the stability of the anti-rotation function of the motor, the parts are more interchangeable and the motor parts are easy to reuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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:

[0022] Figure 1 A schematic diagram of the three-dimensional structure of a brushless coreless motor provided in an embodiment of the present invention;

[0023] Figure 2 A three-dimensional structural exploded view of a brushless coreless motor provided by an embodiment of the present invention;

[0024] Figure 3 for Figure 1 AA line section view;

[0025] Figure 4 A partial exploded schematic diagram of a brushless coreless motor provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] 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.

[0027] Please combine Figures 1 to 4 As shown, Figure 1 A schematic diagram of the three-dimensional structure of a brushless coreless motor provided in an embodiment of the present invention, Figure 2 The three-dimensional structure exploded diagram of the brushless hollow cup motor provided by the embodiment of the present invention is as follows: Figure 3 for Figure 1 AA line cross-sectional view, 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 inner circumference of the housing 1, and a rotor assembly 3 supported by the housing 1 and forming a rotation connection;

[0028] The housing 1 comprises a first cover plate 11, a second cover plate 12 and a hollow housing body 13 sandwiched between the first cover plate 11 and the second cover plate 12;

[0029] The stator assembly 2 is fixed to the inner circumference of the housing body 13 and is spaced around the outer circumference of the rotor assembly 3;

[0030] The two ends of the rotor assembly 3 are respectively supported on the first cover plate 11 and the second cover plate 12, and are rotatably connected with the first cover plate 11 and the second cover plate 12;

[0031] The brushless coreless motor 100 further includes a casing 7 with a hollow structure, the casing 7 is sleeved on the outer peripheral side of the housing 1 and its open end abuts against the first cover plate 11, and the casing 7 and the first cover plate 11 together enclose a receiving space for receiving the second cover plate 12, the housing body 13, the stator assembly 2 and the rotor assembly 3;

[0032] For details, please refer to Figure 4The partially exploded schematic diagram of the brushless hollow cup motor shown in the figure, the end of the casing 7 close to the first cover plate 11 is also provided with a positioning groove 71 formed by being recessed in the direction of the second cover plate 12, and the side of the first cover plate 11 close to the casing 7 is provided with a positioning block 111 formed by protruding in the direction of the second cover plate 12, and the positioning block 111 is embedded in the positioning groove 71 to realize the positioning of the first cover plate 11 relative to the casing 7.

[0033] The fixed connection between the first cover plate 11 and the housing 7 can realize the anti-rotation function of the motor relative to the structure of the housing 7, thereby ensuring stable operation of the motor.

[0034] A plurality of first fixing holes 72 are provided on one side of the casing 7 close to the first cover plate 11, and a plurality of second fixing holes 112 corresponding to the first fixing holes 72 are provided through the first cover plate 11 along the axial direction of the rotor assembly 3, and screws are screwed into the first fixing holes 72 through the second fixing holes 112 to lock and fix the first cover plate 11 and the casing 7.

[0035] For details, please refer to Figure 2 and Figure 4 The first cover plate 11 includes a cover plate body 113 covering the open end of the casing 7 and a fixing ring 114 formed by protruding and extending from one side of the cover plate body 113 close to the casing 7, the positioning block 111 is formed on the cover plate body 113 and is located on the outer peripheral side of the fixing ring 111, the second fixing holes 112 are opened on the periphery of the cover plate body 113 and are spaced around the fixing ring 114; the fixing ring 114 is inserted into the open end of the casing 7.

[0036] In the above structure, the motor and the casing are fixed by screw locking and precise positioning based on the positioning groove 71 to achieve the anti-rotation function, which not only ensures the precise relative position of the motor and the casing, but also achieves the anti-rotation function of the motor and the casing through screw locking. At the same time, the screw locking method is simple to assemble, easy to disassemble, highly interchangeable, and easy to reuse some parts.

[0037] Ginseng Figure 2 and Figure 3 As shown, the brushless hollow cup motor 100 also includes a first bearing 4 and a second bearing 5, a groove is provided on the side of the second cover plate 12 close to the first cover plate 11, the outer peripheral side of the first bearing 4 is fixed to the inner side of the fixing ring 111, and the outer peripheral side of the second bearing 5 is fixed to the groove of the second cover plate 12; the two ends of the rotor assembly 3 are respectively inserted and fixed to the inner peripheral side of the first bearing 4 and the inner peripheral side of the second bearing 5.

[0038] The structure of the rotor assembly 3 combined with the bearing can effectively control the axial and radial movement of the motor rotor, thereby improving the stability of the motor rotation.

[0039] The stator assembly 2 includes a coil 21 coaxially arranged with the housing and fixed to the inner circumference of the housing. In the embodiment of the present invention, the coil 21 and the rotor assembly 3 generate a magnetic field to drive the rotor assembly 3 to rotate.

[0040] The rotor assembly 3 includes a rotating shaft 31 that is rotatably connected to the first cover plate 11 and the second cover plate 12, a rotor magnetic ring 32 that is sleeved and fixed to the rotating shaft 31, and a rotor magnetic steel 33 that is sleeved and fixed to the rotor magnetic ring 32. The stator assembly 2 and the coil 21 generate a magnetic field to drive the rotating shaft 31 to rotate between the first cover plate 11 and the second cover plate 12, thereby achieving a motor rotation effect.

[0041] The brushless coreless motor 100 further includes a circuit board 6 , which is fixed to a side of the second cover plate 12 away from the first cover plate 11 , and an output terminal 61 is provided on the circuit board 6 .

[0042] A through hole 73 is provided on one side of the housing 7 , and a wire connected to the outlet terminal 61 extends to the outside of the housing 7 through the through hole 73 .

[0043] In the embodiment of the present invention, the position of the through hole 73 makes the position of the motor outlet clear, which is convenient for assembly and reduces the complexity of motor assembly.

[0044] The brushless hollow cup motor 100 also includes a sensor assembly 8, which is used to detect the rotation data of the rotor assembly 3. The sensor assembly 8 includes a sensor magnet 81 that is sleeved and fixed on one end of the rotor assembly 3 away from the second bearing 5 and a Hall sensor 82 that is fixed on a side of the circuit board 6 close to the second cover plate 12; the Hall sensor 82 is arranged relative to the sensor magnet 81.

[0045] In the embodiment of the present invention, the rotation data of the rotating shaft 31 is collected by the sensor magnet 81, and the Hall sensor 82 senses and collects data with the sensor magnet 81. The Hall sensor 82 processes the rotation data. After the circuit board 6 uniformly collects the sensor data, the processed data is transmitted to an external device for display, so as to facilitate the motor control.

[0046] Compared with the prior art, the brushless hollow cup motor of the present invention comprises a housing, a stator assembly fixed to the inner circumference of the housing, and a rotor assembly supported by the housing and rotatably connected; the housing comprises a first cover plate, a second cover plate, and a hollow housing body sandwiched between the first cover plate and the second cover plate; the stator assembly is fixed to the inner circumference of the housing body and is arranged at intervals around the outer circumference of the rotor assembly; the two ends of the rotor assembly are respectively supported by the first cover plate and the second cover plate, and are rotatably connected with the first cover plate and the second cover plate; the brushless hollow cup motor also comprises a casing with a hollow structure, the casing is sleeved on the outer circumference of the housing and its open end abuts against the first cover plate, the casing and the first cover plate together enclose a receiving space for receiving the second cover plate, the housing body, the stator assembly and the rotor assembly; the end of the casing close to the first cover plate is also provided with a positioning groove formed by being recessed in the direction of the second cover plate, and the side of the first cover plate close to the casing is provided with a positioning block formed by protruding in the direction of the second cover plate, and the positioning block is embedded in the positioning groove. In the above structure, the protective shell and the motor part are easy to assemble and disassemble. Under the premise of ensuring the stability of the anti-rotation function of the motor, the parts are more interchangeable and the motor parts are easy to reuse.

[0047] 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 inner circumference of the housing, and a rotor assembly supported by the housing and forming a rotational connection; The housing comprises a first cover plate, a second cover plate and a hollow housing body sandwiched between the first cover plate and the second cover plate; The stator assembly is fixed to the inner circumference of the housing body and is spaced around the outer circumference of the rotor assembly; The two ends of the rotor assembly are respectively supported on the first cover plate and the second cover plate, and are rotatably connected with the first cover plate and the second cover plate; characterized in that: The brushless coreless motor further comprises a casing with a hollow structure, wherein the casing is sleeved on the outer peripheral side of the shell and an open end thereof abuts against the first cover plate, and the casing and the first cover plate together enclose a receiving space for receiving the second cover plate, the shell body, the stator assembly and the rotor assembly; One end of the housing close to the first cover plate is further provided with a positioning groove recessed toward the second cover plate, and one side of the first cover plate close to the housing is provided with a positioning block protruding toward the second cover plate, and the positioning block is embedded in the positioning groove.

2. The brushless coreless motor according to claim 1, characterized in that: A plurality of first fixing holes are formed at one end of the casing close to the first cover plate, and a plurality of second fixing holes corresponding to the first fixing holes are formed through the first cover plate along the axial direction of the rotor assembly, and screws are extended from the second fixing holes to the first fixing holes to lock and fix the first cover plate and the casing.

3. The brushless coreless motor according to claim 2, characterized in that: The first cover plate includes a cover plate body covering the open end of the casing and a fixing ring formed by protruding and extending from one side of the cover plate body close to the casing, the positioning block is formed on the cover plate body and is located on the outer peripheral side of the fixing ring, the second fixing holes are opened on the periphery of the cover plate body and are spaced around the fixing ring; the fixing ring is inserted into the open end of the casing.

4. The brushless coreless motor according to claim 3, characterized in that: The brushless hollow cup motor also includes a first bearing and a second bearing. A groove is provided on the side of the second cover plate close to the first cover plate. The outer peripheral side of the first bearing is fixed to the inner side of the fixing ring, and the outer peripheral side of the second bearing is fixed in the groove of the second cover plate; the two ends of the rotor assembly are respectively inserted and fixed to the inner peripheral side of the first bearing and the inner peripheral side of the second bearing.

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

6. The brushless coreless motor according to claim 1, characterized in that: The rotor assembly includes a rotating shaft that is rotatably connected to the first cover plate and the second cover plate respectively, a rotor magnetic ring that is sleeved and fixed on the rotating shaft, and a rotor magnetic steel that is sleeved and fixed on the rotor magnetic ring.

7. The brushless coreless motor according to claim 1, characterized in that: The brushless coreless motor further comprises a circuit board, which is fixed to a side of the second cover plate away from the first cover plate, and the circuit board is provided with an output terminal.

8. The brushless coreless motor according to claim 7, characterized in that: A through hole is provided on one side of the housing, and a wire connected to the outlet terminal extends to the outside of the housing through the through hole.

9. The brushless coreless motor according to claim 7, characterized in that: The brushless hollow cup motor also includes a sensor assembly, which is used to detect the rotation data of the rotor assembly. The sensor assembly includes a sensor magnet fixed on one end of the rotor assembly away from the second bearing and a Hall sensor fixed on a side of the circuit board close to the second cover plate; the Hall sensor and the sensor magnet are arranged relative to each other.

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