Brushless coreless motor

Abstract

The present invention relates to the technical field of motors. Provided are a brushless coreless motor, which comprises a housing, and a stator assembly and a rotor assembly fixed on the inner circumferential side of the housing. The housing comprises a first cover plate, a second cover plate, and a hollow housing body sandwiched between the cover plates. The stator assembly is fixed on the inner circumferential side of the housing body and is arranged at intervals around the outer circumferential side of the rotor assembly. The rotor assembly is supported on the first and second cover plates and forms a rotational connection thereto. The brushless coreless motor also comprises a hollow casing, the casing being sleeved on the outer circumferential side of the housing and forming an accommodation space together with the first cover plate so as to accommodate 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 further provided with a positioning recess, and the side of the first cover plate close to the casing is provided with a positioning block, the positioning block being embedded in the positioning recess. Compared with the prior art, the present invention has higher interchangeability of parts and facilitates repeated utilization of motor parts while ensuring the stable anti-rotation function of motors.

Description

Brushless Hollow Cup 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 coreless 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 coreless motors. The widespread application of these brushless coreless motor direct-drive devices will generate immeasurable energy-saving benefits. Technical issues

[0003] In related technologies, most existing brushless coreless motors consist of a housing, a rotor, and a stator wound at intervals around the rotor, with an external protective shell defining the motor's shape for ease of use. However, existing brushless coreless motors primarily use pressing or gluing to fix the motor to the protective shell to achieve anti-rotation functionality. Both of these fixing methods are prone to loosening under long-term motor vibration, resulting in low reliability. Pressing requires higher consistency in component dimensions, posing a significant challenge to component manufacturing and cost control. Gluing requires uniform and consistent glue spacing, involves complex gluing processes, uses expensive glue, and also demands high consistency in component dimensions, further posing a challenge to cost control. Both fixing methods also make disassembly difficult, reducing component interchangeability and hindering the reusability of some components.

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

[0005] The purpose of this invention is to provide a brushless hollow cup motor that is easy to install and has a stable anti-rotation function.

[0006] To achieve the above objectives, the present invention provides a brushless hollow cup motor, which includes a housing, a stator assembly fixed to the inner circumferential side of the housing, and a rotor assembly supported on the housing and forming a rotatable connection.

[0007] The outer shell includes a first cover plate, a second cover plate, and a hollow outer shell 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 apart around the outer circumference of the rotor assembly.

[0009] The rotor assembly is supported at both ends by the first cover plate and the second cover plate, respectively, and forms a rotatable connection with the first cover plate and the second cover plate;

[0010] The brushless hollow cup motor also includes a hollow housing, which is fitted onto the outer periphery of the outer shell and its open end abuts against the first cover plate. The housing and the first cover plate together form a receiving space that accommodates the second cover plate, the outer shell body, the stator assembly and the rotor assembly.

[0011] The housing is provided with a positioning groove recessed towards the second cover plate at one end near the first cover plate, and a positioning block protruding towards the second cover plate is provided on the side of the first cover plate near the housing, and the positioning block is embedded in the positioning groove.

[0012] Furthermore, the housing has a plurality of first fixing holes at one end near the first cover plate, and the first cover plate has a plurality of second fixing holes corresponding to the first fixing holes through the axial direction of the rotor assembly. Screws are used to extend from the second fixing holes to the first fixing holes to lock and fix the first cover plate and the housing.

[0013] Furthermore, the first cover plate includes a cover plate body covering the open end of the housing and a fixing ring extending from the side of the cover plate body near the housing. The positioning block is formed on the cover plate body and located on the outer periphery of the fixing ring. The second fixing hole is opened on the periphery of the cover plate body and spaced around the fixing ring. The fixing ring is inserted into the open end of the housing.

[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 near 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 disposed with the housing and fixed to the inner circumference of the housing.

[0016] Furthermore, 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 to the rotating shaft, and a rotor magnet that is sleeved and fixed to the rotor magnetic ring.

[0017] Furthermore, the brushless hollow cup motor also includes a circuit board, which is fixed to the side of the second cover plate away from the first cover plate, and the circuit board is provided with output terminals.

[0018] Furthermore, a through hole is provided on one side of the housing, through which the wire for connecting the output terminal extends to the outside of the housing.

[0019] Furthermore, the brushless hollow cup motor also includes a sensor assembly for detecting the rotational data of the rotor assembly. The sensor assembly includes a sensor magnet sleeved and fixed to one end of the rotor assembly away from the second bearing and a Hall sensor fixed to one side of the circuit board near the second cover plate; the Hall sensor and the sensor magnet are arranged at a distance from each other. Beneficial effects

[0020] Compared with the prior art, the brushless hollow cup motor of the present invention includes a housing, a stator assembly fixed to the inner circumference of the housing, and a rotor assembly supported by the housing and rotatably connected thereto. The housing includes 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 spaced 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 rotatably connected to the first cover plate and the second cover plate. The brushless hollow cup motor also includes a hollow housing, which is fitted onto the outer circumference of the housing and its open end abuts against the first cover plate. The housing and the first cover plate together form a receiving space that accommodates the second cover plate, the housing body, the stator assembly, and the rotor assembly. The housing is also provided with a positioning groove recessed towards the second cover plate at one end near the first cover plate, and a positioning block protruding towards the second cover plate is provided on the side of the first cover plate near the housing. The positioning block is embedded in the positioning groove. In the above structure, the assembly of the protective shell and the motor part is simple and easy to disassemble. Under the premise of ensuring the stability of the motor's anti-rotation function, the interchangeability of parts is higher and the motor parts are easy to reuse. Attached Figure Description

[0021] 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:

[0022] Figure 1 is a three-dimensional structural schematic diagram of the brushless hollow cup motor provided in an embodiment of the present invention;

[0023] Figure 2 is an exploded three-dimensional view of the brushless hollow cup motor provided in an embodiment of the present invention;

[0024] Figure 3 is a cross-sectional view along line AA in Figure 1;

[0025] Figure 4 is a partial exploded view of the brushless hollow cup motor provided in an embodiment of the present invention. Embodiments of the present invention

[0026] 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.

[0027] Please refer to Figures 1 to 4. Figure 1 is a three-dimensional structural schematic diagram of the brushless hollow cup motor provided in the embodiment of the present invention. Figure 2 is an exploded three-dimensional structural diagram of the brushless hollow cup motor provided in the embodiment of the present invention. Figure 3 is a cross-sectional view along line AA of Figure 1. The present invention provides a brushless hollow cup motor 100, which includes a housing 1, a stator assembly 2 fixed to the inner circumferential side of the housing 1, and a rotor assembly 3 supported on the housing 1 and forming a rotatable connection.

[0028] The outer shell 1 includes a first cover plate 11, a second cover plate 12, and a hollow outer shell 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 outer casing 13 and is spaced around the outer circumference of the rotor assembly 3.

[0030] The rotor assembly 3 is supported at both ends by the first cover plate 11 and the second cover plate 12 respectively, and forms a rotatable connection with the first cover plate 11 and the second cover plate 12.

[0031] The brushless hollow cup motor 100 also includes a hollow housing 7, which is sleeved on the outer periphery of the outer shell 1 and its open end abuts against the first cover plate 11. The housing 7 and the first cover plate 11 together form a receiving space that accommodates the second cover plate 12, the outer shell body 13, the stator assembly 2 and the rotor assembly 3.

[0032] Specifically, please refer to the partially exploded schematic diagram of the brushless hollow cup motor shown in Figure 4. The end of the housing 7 near the first cover plate 11 is provided with a positioning groove 71 that is recessed towards the second cover plate 12. The side of the first cover plate 11 near the housing 7 is provided with a positioning block 111 that protrudes towards the second cover plate 12. The positioning block 111 is embedded in the positioning groove 71 to achieve the positioning of the first cover plate 11 relative to the housing 7.

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

[0034] The housing 7 has a plurality of first fixing holes 72 on the side near the first cover plate 11. The first cover plate 11 has a plurality of second fixing holes 112 corresponding to the first fixing holes 72 through the axial direction of the rotor assembly 3. The first cover plate 11 and the housing 7 are locked and fixed by screws screwed into the first fixing holes 72 through the second fixing holes 112.

[0035] Specifically, referring to Figures 2 and 4, the first cover plate 11 includes a cover plate body 113 covering the opening end of the housing 7 and a fixing ring 114 extending from the side of the cover plate body 113 near the housing 7. The positioning block 111 is formed on the cover plate body 113 and located on the outer periphery of the fixing ring 111. The second fixing hole 112 is opened on the periphery of the cover plate body 113 and is spaced around the fixing ring 114. The fixing ring 114 is inserted into the opening end of the housing 7.

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

[0037] Referring to Figures 2 and 3, the brushless hollow cup motor 100 also includes a first bearing 4 and a second bearing 5. The second cover plate 12 has a groove on the side near 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 rotor assembly 3, combined with the bearing structure, can effectively control the axial and radial movement of the motor rotor, thus 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 this embodiment of the invention, the coil 21 and the rotor assembly 3 generate a magnetic field with each other, thereby driving the rotor assembly 3 to rotate.

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

[0041] The brushless hollow cup motor 100 also includes a circuit board 6, which is fixed to the side of the second cover plate 12 away from the first cover plate 11, and the circuit board 6 is provided with a wire outlet terminal 61.

[0042] The housing 7 has a through hole 73 on one side, through which the wire for connecting the output terminal 61 extends to the outside of the housing 7.

[0043] In this embodiment of the invention, the position of the through hole 73 makes the motor output position clear, which facilitates 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 sleeved and fixed to one end of the rotor assembly 3 away from the second bearing 5 and a Hall sensor 82 fixed to one side of the circuit board 6 near the second cover plate 12. The Hall sensor 82 and the sensor magnet 81 are arranged at a distance from each other.

[0045] In this embodiment of the invention, the rotation data of the rotating shaft 31 is collected by the sensor magnet 81, and the data is collected by the Hall sensor 82 sensing the sensor magnet 81. The Hall sensor 82 processes the rotation data. After the circuit board 6 collects the sensor data, it transmits the processed data to an external device for display, which facilitates motor control.

[0046] Compared with the prior art, the brushless hollow cup motor of the present invention includes a housing, a stator assembly fixed to the inner circumference of the housing, and a rotor assembly supported by the housing and rotatably connected thereto. The housing includes 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 spaced 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 rotatably connected to the first cover plate and the second cover plate. The brushless hollow cup motor also includes a hollow housing, which is fitted onto the outer circumference of the housing and its open end abuts against the first cover plate. The housing and the first cover plate together form a receiving space that accommodates the second cover plate, the housing body, the stator assembly, and the rotor assembly. The housing is also provided with a positioning groove recessed towards the second cover plate at one end near the first cover plate, and a positioning block protruding towards the second cover plate is provided on the side of the first cover plate near the housing. The positioning block is embedded in the positioning groove. In the above structure, the assembly of the protective shell and the motor part is simple and easy to disassemble. Under the premise of ensuring the stability of the motor's anti-rotation function, the interchangeability of parts is higher and the motor parts are easy to reuse.

[0047] 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 hollow cup motor, comprising a housing, a stator assembly fixed to the inner periphery of the housing, and a rotor assembly supported on the housing and rotatably connected thereto; The outer shell includes a first cover plate, a second cover plate, and a hollow outer shell 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 apart around the outer circumference of the rotor assembly. The rotor assembly is supported at both ends by the first cover plate and the second cover plate, respectively, and forms a rotatable connection with the first cover plate and the second cover plate; characterized in that, The brushless hollow cup motor also includes a hollow housing, which is fitted onto the outer periphery of the outer shell and its open end abuts against the first cover plate. The housing and the first cover plate together form a receiving space that accommodates the second cover plate, the outer shell body, the stator assembly and the rotor assembly. The housing is provided with a positioning groove recessed towards the second cover plate at one end near the first cover plate, and a positioning block protruding towards the second cover plate is provided on the side of the first cover plate near the housing, and the positioning block is embedded in the positioning groove.

2. The brushless, hollow cup motor of claim 1, wherein, The housing has a plurality of first fixing holes at one end near the first cover plate. The first cover plate has a plurality of second fixing holes corresponding to the first fixing holes through the axial direction of the rotor assembly. Screws are used to extend from the second fixing holes to the first fixing holes to lock and fix the first cover plate and the housing.

3. The brushless, hollow cup motor of claim 2, wherein, The first cover plate includes a cover plate body that covers the open end of the housing and a fixing ring that protrudes and extends from the side of the cover plate body near the housing. The positioning block is formed on the cover plate body and located on the outer periphery of the fixing ring. The second fixing hole is opened on the periphery of the cover plate body and is spaced around the fixing ring. The fixing ring is inserted into the open end of the housing.

4. The brushless, hollow cup motor of claim 3, wherein, 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 near 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, hollow cup motor of claim 1, wherein, The stator assembly includes a coil that is coaxially arranged with the housing and fixed to the inner circumference of the housing.

6. The brushless, hollow cup motor of claim 1, wherein, The rotor assembly includes a rotating shaft that is rotatably connected to the first cover plate and the second cover plate, a rotor magnetic ring that is sleeved and fixed to the rotating shaft, and a rotor magnet that is sleeved and fixed to the rotor magnetic ring.

7. The brushless, hollow cup motor of claim 1, wherein, The brushless hollow cup motor also includes a circuit board, which is fixed to the side of the second cover plate away from the first cover plate, and the circuit board is provided with output terminals.

8. The brushless, hollow cup motor of claim 7, wherein, One side of the housing has a through hole, through which the wire for connecting the output terminal extends to the outside of the housing.

9. The brushless, hollow cup motor of claim 7, wherein, The brushless hollow cup motor further comprises a sensor assembly for detecting rotation data of the rotor assembly, the sensor assembly comprising a sensor magnet fixed on an 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 is arranged in opposite spacing with the sensor magnet.

Images