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 in the shell and a rotor assembly supported on the shell and rotationally connected with the shell, and the stator assembly surrounds the rotor assembly and is spaced from the rotor assembly; the brushless coreless motor also comprises a casing which is fixedly sleeved on the housing and is made of a magnetic conductive material. Compared with the prior art, silicon steel sheet laminations in an existing brushless coreless motor are omitted, the internal magnetic circuit space is enlarged, so that the size of magnetic steel can be enlarged, the torque of the motor is effectively improved, the shell made of a magnetic conductive material is assembled outside the shell, magnetic leakage can be reduced, the performance of the brushless coreless motor is improved, and meanwhile, the cost of the brushless coreless motor is reduced. The shape of the machine shell can be flexibly adjusted according to requirements, practicability is higher, and the space utilization rate is higher.

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, due to the hollow cup design, make the motor lightweight and have good heat dissipation performance, and have fast response speed and precise control, and have been widely used in the fields of motors and generators. 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 rear cover wound on the rotor at intervals. The front cover and the rear cover 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 magnetic steel fixed on the outer peripheral side of the rotating shaft. The motor is driven by the magnetic steel and the winding to rotate. However, the existing brushless hollow cup motors often assemble silicon steel sheet stacks on the inner side of the shell to achieve the purpose of reducing magnetic loss. However, due to the presence of silicon steel sheet stacks, the internal magnetic circuit space of the brushless hollow cup motor will be seriously occupied. The volume of the magnetic steel cannot be made very large, which in turn affects the improvement of the motor torque. At the same time, the magnetic circuit design in the existing brushless hollow cup motor is that the rotating shaft and the magnetic steel are in direct contact. This design method has a certain proportion of magnetic leakage risk. Moreover, when the size of the intermediate shaft hole of the magnetic steel is small, a more complicated processing technology is required to ensure the coaxiality of the outer circle and the inner circle of the magnetic steel, which is costly and not conducive to mass production.

[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 purpose of the present invention is to provide a brushless hollow cup motor, which aims to eliminate the annular silicon steel sheet stacking in the existing brushless hollow cup motor, release the magnetic circuit space, and assemble a casing of magnetic conductive material on the outside of the outer shell, so as to effectively reduce the magnetic loss of the motor stator and improve the efficiency and performance of the brushless hollow cup motor as a whole.

[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 in the housing, and a rotor assembly supported at both ends of 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;

[0007] The brushless hollow cup motor also includes a casing, which is sleeved on the outside of the shell, and the shape of the inner side of the shell matches the outer side of the shell, and the casing is made of magnetic conductive material.

[0008] Preferably, the outer shell also 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 side of the rear cover away from the outer shell, and the two ends of the rotor assembly are respectively rotatably connected with the front cover and the rear cover; the casing is fixed to the shell.

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

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

[0011] Preferably, the front cover comprises a fixing portion fixedly connected to the housing and a connecting portion formed by extending the fixing portion along the axial direction of the rotating shaft, and an outer periphery of the connecting portion is fixed in the shell.

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

[0013] Preferably, the brushless hollow cup motor also includes a first bearing and a second bearing, the first bearing is sleeved and fixed on one end of the rotating shaft close to the front cover, the outer periphery of the first bearing is fixed in the front cover, the second bearing is sleeved on one end of the rotating shaft away from the front cover, and the outer periphery of the second bearing is fixed in the rear cover.

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

[0015] 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 rear cover; the Hall sensor is relatively spaced from the sensor magnet.

[0016] Compared with the prior art, the brushless hollow cup motor of the present invention includes a housing, a stator assembly fixed in the housing, and a rotor assembly supported by the housing and rotatably connected with the housing, wherein the stator assembly is arranged around the rotor assembly and spaced apart from the rotor assembly; the brushless hollow cup motor also includes a casing, which is sleeved and fixed to the housing, and the casing is made of a magnetic conductive material. The present invention eliminates the silicon steel sheet laminations in the existing brushless hollow cup motor, increases the internal magnetic circuit space, thereby increasing the volume of the magnetic steel and effectively improving the motor torque. By assembling a casing made of magnetic conductive material on the outside of the housing, magnetic leakage can be reduced and the performance of the brushless hollow cup motor can be improved. At the same time, the shape of the casing can be flexibly adjusted according to demand, which is more practical and has a higher utilization rate of space. 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] Among them, 100, brushless hollow cup motor, 1, shell, 11, shell, 12, front cover, 121, fixing part, 122, connecting part, 13, rear cover, 2, stator assembly, 3, rotor assembly, 31, rotating shaft, 32, iron core, 33, magnet, 4, casing, 5, circuit board, 6, first bearing, 7, second bearing, 8, sensor assembly, 81, sensor magnet, 82, Hall sensor. DETAILED DESCRIPTION

[0022] 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.

[0023] Combination Figures 1 to 3As shown, an embodiment of the present invention provides a brushless hollow cup motor 100. The present invention provides a brushless hollow cup motor 100, which includes a shell 1, a stator assembly 2 fixed in the shell 1, and a rotor assembly 3 supported at both ends of the shell 1 and rotatingly connected to the shell 1, wherein the stator assembly 2 is arranged around the rotor assembly 3 and is spaced apart from the rotor assembly 3.

[0024] The brushless coreless motor 100 further includes a housing 4, which is sleeved on the outer side of the housing 1, and the shape of the inner side of the housing 4 matches the outer side of the housing 1, and the housing 4 is made of a magnetic conductive material. Specifically, by sleeve-fixing the housing 4 on the housing 1, since the housing 4 is made of a magnetic conductive material, magnetic leakage can be reduced and motor performance can be improved. At the same time, the shape of the housing 4 can be flexibly adjusted according to demand, which is more practical and has a higher space utilization rate.

[0025] In this embodiment, the housing 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 side of the rear cover 13 away from the shell 1. The two ends of the rotor assembly 3 are respectively rotatably connected to the front cover 12 and the rear cover 13, 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 respectively, an iron core 32 that is sleeved and fixed on the rotating shaft 31, and a magnet 33 that is sleeved and fixed on the iron core 32; the magnet 33 is spaced apart from the stator assembly 2.

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

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

[0030] In this embodiment, the magnetic steel 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, wherein the first bearing 6 is sleeved and fixed to one end of the rotating shaft 31 close to the front cover 12, and the outer periphery of the first bearing 6 is fixed in the front cover 12, and the second bearing 7 is sleeved to one end of the rotating shaft 31 away from the front cover 12, and the outer periphery of the second bearing 7 is fixed in the rear cover 13. The rotation performance of the rotor assembly 3 is effectively enhanced.

[0032] In this embodiment, the brushless hollow cup motor 100 also 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 magnet 33 mounted on the end of the rotating shaft 31 away from the second bearing 7 and a Hall sensor 82 fixed on the side of the circuit board 5 close to the rear cover 13; the Hall sensor 82 is relatively spaced from the sensor magnet 81 magnet 33.

[0033] Compared with the prior art, the brushless hollow cup motor of the present invention includes a housing, a stator assembly fixed in the housing, and a rotor assembly supported by the housing and rotatably connected with the housing, wherein the stator assembly is arranged around the rotor assembly and spaced apart from the rotor assembly; the brushless hollow cup motor also includes a casing, which is sleeved and fixed to the housing, and the casing is made of a magnetic conductive material. The present invention eliminates the silicon steel sheet laminations in the existing brushless hollow cup motor, increases the internal magnetic circuit space, thereby increasing the volume of the magnetic steel and effectively improving the motor torque. By assembling a casing made of magnetic conductive material on the outside of the housing, magnetic leakage can be reduced and the performance of the brushless hollow cup motor can be improved. At the same time, the shape of the casing can be flexibly adjusted according to demand, which is more practical and has a higher utilization rate of space.

[0034] 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 in the housing, and a rotor assembly supported at both ends of 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 coreless motor further comprises a casing, which is sleeved on the outer side of the shell, and the shape of the inner side of the casing matches the outer side of the shell, and the casing is made of magnetic conductive material.

2. The brushless coreless motor according to claim 1, characterized in that: The outer shell 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 side of the rear cover away from the outer shell, and the two ends of the rotor assembly are respectively rotatably connected to the front cover and the rear cover; the casing is fixed to the shell.

3. The brushless coreless motor according to claim 2, characterized in that: The shell is made of soft magnetic material.

4. The brushless coreless motor according to claim 3, characterized in that: The rotor assembly includes a rotating shaft which is rotatably connected to the front cover and the rear cover respectively, an iron core which is sleeved and fixed on the rotating shaft, and a magnetic steel which is sleeved and fixed on the iron core; the magnetic steel and the stator assembly are spaced apart from each other.

5. The brushless coreless motor according to claim 4, characterized in that: The front cover includes a fixing portion fixedly connected to the housing and a connecting portion formed by extending the fixing portion along the axial direction of the rotating shaft, and the outer periphery of the connecting portion is fixed in the shell.

6. The brushless coreless motor according to claim 4, characterized in that: The magnetic steel is made of hard magnetic material.

7. The brushless coreless motor according to claim 4, characterized in that: The brushless hollow cup motor also includes a first bearing and a second bearing. The first bearing is sleeved and fixed on 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. The second bearing is sleeved on one end of the rotating shaft away from the front cover, and the outer periphery of the second bearing is fixed in the rear cover.

8. The brushless coreless motor according to claim 4, characterized in that: The iron core is made of magnetic conductive material.

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 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 rear cover; the Hall sensor is relatively spaced from the sensor magnet.

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