Brushless coreless electric motor

Abstract

The present invention relates to the technical field of electric motors. Provided is a brushless coreless electric motor. The brushless coreless electric motor of the present invention comprises a housing, a stator assembly fixed in the housing, and a rotor assembly, which is supported in the housing and is rotationally connected to the housing, wherein the stator assembly surrounds the rotor assembly and is spaced apart from the rotor assembly. The brushless coreless electric motor further comprises a casing, which is sleeved on and fixed to the housing and is made of a magnetically conductive material. Compared with the prior art, the present invention eliminates silicon steel laminations in the existing brushless coreless electric motor, thereby increasing an internal magnetic circuit space, such that the volume of the steel magnet can be increased, and thus the torque of the electric motor is effectively increased. By means of assembling the casing, which is made of the magnetically conductive material, on the outside of the housing, the magnetic flux leakage can be reduced, and the performance of the brushless coreless motor can thus be improved; moreover, the shape of the casing can be flexibly adjusted on the basis of requirements, and therefore the practicability is higher, and the space utilization rate is higher.

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 coreless design, are lightweight while also possessing excellent heat dissipation. They also offer fast response and precise control, leading to their widespread application 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 include a front cover, a rotor, a stator wound at intervals around the rotor, and a rear cover. The front and rear covers are respectively located at opposite ends of the stator, and the motor rotation is achieved through the mutual drive of the stator and 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 through the mutual drive of the magnets and windings. However, existing brushless coreless motors often assemble silicon steel sheet stacks inside the housing to reduce magnetic losses. However, the presence of silicon steel sheet stacks significantly occupies the internal magnetic circuit space of the brushless coreless motor, limiting the size of the magnets and thus affecting the increase in motor torque. Furthermore, the magnetic circuit design in existing brushless coreless motors involves direct contact between the shaft and the magnets, which carries a certain risk of magnetic leakage. Moreover, with small-sized intermediate shaft holes for the magnets, complex machining processes are required to ensure the coaxiality of the outer and inner circles of the magnets, resulting in high costs and hindering mass production.

[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 coreless motor that eliminates the annular silicon steel sheet stack in existing brushless coreless motors, frees up magnetic circuit space, and assembles a housing with magnetically conductive material on the outside of the outer shell, effectively reducing the magnetic loss of the motor stator and improving the overall efficiency and performance of the brushless coreless motor.

[0006] To achieve the above objectives, the present invention provides a brushless coreless motor, which includes a housing, a stator assembly fixed inside the housing, and a rotor assembly supported at both ends of the housing and rotatably connected to the housing. The stator assembly is arranged around the rotor assembly and spaced apart from the rotor assembly.

[0007] The brushless hollow cup motor also includes a housing, which is fitted onto the outside of the outer shell, and the shape of the inner side of the housing matches the outer side of the outer shell. The housing is made of a magnetically conductive material.

[0008] Preferably, the outer casing further includes a hollow cylindrical shell, a front cover fixed to one end of the shell, a rear cover fixedly connected to the other end of the shell, and a circuit board fixed to the rear cover on the side away from the outer casing. The two ends of the rotor assembly are rotatably connected to the front cover and the rear cover, respectively. The housing is fitted and fixed to the shell.

[0009] Preferably, the housing is made of a soft magnetic material.

[0010] Preferably, the rotor assembly includes a rotating shaft that is rotatably connected to the front cover and the rear cover, an iron core sleeved and fixed to the rotating shaft, and a magnet sleeved and fixed to the iron core; the magnet and the stator assembly are spaced apart from each other.

[0011] Preferably, the front cover includes a fixing part that is fixedly connected to the housing and a connecting part formed by the fixing part extending along the axial direction of the rotating shaft, the outer periphery of the connecting part being fixed inside the housing.

[0012] Preferably, the magnet is made of a hard magnetic material.

[0013] Preferably, the brushless hollow cup motor further includes a first bearing and a second bearing. The first bearing is sleeved and fixed at one end of the rotating shaft near the front cover, and the outer periphery of the first bearing is fixed inside the front cover. The second bearing is sleeved at one end of the rotating shaft away from the front cover, and the outer periphery of the second bearing is fixed inside the rear cover.

[0014] Preferably, the iron core is made of a magnetically conductive material.

[0015] Preferably, the brushless hollow cup motor further includes a sensor assembly for detecting the rotation data of the rotating shaft. The sensor assembly includes a sensor magnet sleeved and fixed to one end of the rotating shaft away from the second bearing and a Hall sensor fixed to the side of the circuit board near the rear cover; the Hall sensor and the sensor magnet are spaced apart from each other. Beneficial effects

[0016] Compared with existing technologies, the brushless coreless motor of the present invention comprises a housing, a stator assembly fixed within the housing, and a rotor assembly supported by and rotatably connected to the housing. The stator assembly is arranged around and spaced apart from the rotor assembly. The brushless coreless motor also includes a housing fitted and fixed to the housing, the housing being made of a magnetically conductive material. This invention eliminates the silicon steel sheet laminations in existing brushless coreless motors, increasing the internal magnetic circuit space and allowing for a larger magnet volume, effectively improving motor torque. By assembling a housing made of magnetically conductive material outside the housing, magnetic leakage is reduced, improving the performance of the brushless coreless motor. Furthermore, the housing shape can be flexibly adjusted according to requirements, enhancing practicality and space utilization. Attached Figure Description

[0017] 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:

[0018] Figure 1 is a three-dimensional structural schematic diagram of the brushless hollow cup motor provided in an embodiment of the present invention;

[0019] Figure 2 is an exploded three-dimensional view of the brushless hollow cup motor provided in an embodiment of the present invention;

[0020] Figure 3 is a cross-sectional view along line AA of Figure 1.

[0021] Among them, 100 is a brushless hollow cup motor; 1 is a shell; 11 is a housing; 12 is a front cover; 121 is a fixing part; 122 is a connecting part; 13 is a rear cover; 2 is a stator assembly; 3 is a rotor assembly; 31 is a rotating shaft; 32 is an iron core; 33 is a magnet; 4 is a housing; 5 is a circuit board; 6 is a first bearing; 7 is a second bearing; 8 is a sensor assembly; 81 is a sensor magnet; and 82 is a Hall sensor. Embodiments of the present invention

[0022] 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.

[0023] Referring to Figures 1 to 3, this embodiment of the invention provides a brushless coreless motor 100, which includes a housing 1, a stator assembly 2 fixed inside the housing 1, and a rotor assembly 3 supported at both ends of the housing 1 and rotatably connected to the housing 1. The stator assembly 2 is arranged around the rotor assembly 3 and spaced apart from the rotor assembly 3.

[0024] The brushless hollow cup motor 100 also includes a housing 4, which is fitted onto the outer side of the outer shell 1, and the shape of the inner side of the housing 4 matches the outer side of the outer shell 1. The housing 4 is made of a magnetically conductive material. Specifically, by fixing the housing 4 to the outer shell 1, the use of a magnetically conductive material in the housing 4 reduces magnetic leakage and improves motor performance. Furthermore, the shape of the housing 4 can be flexibly adjusted according to requirements, resulting in greater practicality and higher space utilization.

[0025] In this embodiment, the outer casing 1 includes a hollow cylindrical shell 11, a front cover 12 fixed to one end of the shell 11, a rear cover 13 fixedly connected to the other end of the shell 11, and a circuit board 5 fixed to the rear cover 13 on the side away from the outer casing 1. The two ends of the rotor assembly 3 are rotatably connected to the front cover 12 and the rear cover 13, respectively, and the housing 4 is sleeved and fixed to the shell 11.

[0026] In this embodiment, the housing 11 is made of soft magnetic material.

[0027] In this embodiment, the rotor assembly 3 includes a rotating shaft 31 that is rotatably connected to the front cover 12 and the rear cover 13, an iron core 32 that is sleeved and fixed to the rotating shaft 31, and a magnet 33 that is sleeved and fixed to the iron core 32; the magnet 33 and the stator assembly 2 are spaced apart from each other.

[0028] In this embodiment, the iron core 32 is made of a magnetically conductive material. By using a magnetically conductive material for the iron core 32, the magnetic loss of the rotor assembly 3 can be reduced, thereby improving the efficiency and performance of the brushless coreless motor 100.

[0029] In this embodiment, the front cover 12 includes a fixing part 121 fixedly connected to the housing 4 and a connecting part 122 formed by the fixing part 121 extending along the axial direction of the rotating shaft 31. The outer periphery of the connecting part 122 is fixed inside the housing 11.

[0030] In this embodiment, the magnet 33 is made of hard magnetic material, which effectively increases the structural strength of the rotor assembly 2.

[0031] In this embodiment, the brushless hollow cup motor 100 further includes a first bearing 6 and a second bearing 7. The first bearing 6 is sleeved and fixed to one end of the rotating shaft 31 near the front cover 12, and its outer periphery is fixed inside the front cover 12. The second bearing 7 is sleeved on one end of the rotating shaft 31 away from the front cover 12, and its outer periphery is fixed inside the rear cover 13. This effectively enhances the rotational performance of the rotor assembly 3.

[0032] In this embodiment, the brushless hollow cup motor 100 further includes a sensor assembly 8, which is used to detect the rotation data of the rotating shaft 31. The sensor assembly 8 includes a sensor magnet 81 and magnet 33 sleeved and fixed to one end of the rotating shaft 31 away from the second bearing 7, and a Hall sensor 82 fixed to the side of the circuit board 5 near the rear cover 13; the Hall sensor 82 and the sensor magnet 81 and magnet 33 are spaced apart from each other.

[0033] Compared with existing technologies, the brushless coreless motor of the present invention comprises a housing, a stator assembly fixed within the housing, and a rotor assembly supported by and rotatably connected to the housing. The stator assembly is arranged around and spaced apart from the rotor assembly. The brushless coreless motor also includes a housing fitted and fixed to the housing, the housing being made of a magnetically conductive material. This invention eliminates the silicon steel sheet laminations in existing brushless coreless motors, increasing the internal magnetic circuit space and allowing for a larger magnet volume, effectively improving motor torque. By assembling a housing made of magnetically conductive material outside the housing, magnetic leakage is reduced, improving the performance of the brushless coreless motor. Furthermore, the housing shape can be flexibly adjusted according to requirements, enhancing practicality and space utilization.

[0034] 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 cupless motor comprising a housing, a stator assembly fixed within said housing, and a rotor assembly supported at both ends of said housing and rotatably connected to said housing, said stator assembly being disposed around and spaced from said rotor assembly; characterized in that, The brushless hollow cup motor also includes a housing, which is fitted onto the outside of the outer shell, and the shape of the inner side of the housing matches the outer side of the outer shell. The housing is made of magnetically conductive material.

2. The brushless, hollow cup motor of claim 1, wherein, The outer casing includes a hollow cylindrical shell, a front cover fixed to one end of the shell, a rear cover fixedly connected to the other end of the shell, and a circuit board fixed to the rear cover on the side away from the outer casing. The two ends of the rotor assembly are rotatably connected to the front cover and the rear cover, respectively. The housing is fitted and fixed to the shell.

3. The brushless, hollow cup motor of claim 2, wherein, The shell is made of soft magnetic material.

4. A brushless, hollow cup motor as claimed in claim 3, characterized in that The rotor assembly includes a rotating shaft that is rotatably connected to the front cover and the rear cover, an iron core that is sleeved and fixed to the rotating shaft, and a magnet that is sleeved and fixed to the iron core; the magnet and the stator assembly are spaced apart from each other.

5. A brushless, hollow cup motor as claimed in claim 4, characterized in that The front cover includes a fixing part that is fixedly connected to the housing and a connecting part formed by the fixing part extending along the axial direction of the rotating shaft, the outer periphery of the connecting part being fixed inside the housing.

6. The brushless, hollow cup motor of claim 4, wherein, The magnet is made of a hard magnetic material.

7. The brushless, hollow cup motor of claim 4, wherein, The brushless hollow cup motor also includes a first bearing and a second bearing. The first bearing is sleeved and fixed at one end of the rotating shaft near the front cover, and the outer periphery of the first bearing is fixed inside the front cover. The second bearing is sleeved at one end of the rotating shaft away from the front cover, and the outer periphery of the second bearing is fixed inside the rear cover.

8. The brushless, hollow cup motor of claim 4, wherein, The iron core is made of a magnetically conductive material.

9. The brushless, hollow cup motor of claim 7, wherein, The brushless hollow cup motor also includes a sensor assembly for detecting the rotation data of the rotating shaft. The sensor assembly includes a sensor magnet sleeved and fixed to one end of the rotating shaft away from the second bearing and a Hall sensor fixed to the side of the circuit board near the rear cover; the Hall sensor and the sensor magnet are spaced apart from each other.

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