WO2022110360A1

WO2022110360A1 - Brushless electric motor

Info

Publication number: WO2022110360A1
Application number: PCT/CN2020/136896
Authority: WO
Inventors: 许德涛; 杨森森
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声光电科技(常州)有限公司
Priority date: 2020-11-27
Filing date: 2020-12-16
Publication date: 2022-06-02
Also published as: CN213783111U

Abstract

A brushless electric motor (1000), comprising a rotating shaft (20), a rotor assembly (30) assembled on the rotating shaft (20), a driving assembly (40) arranged coaxially with the rotor assembly (30), and a housing (10) for carrying the rotating shaft (20), the driving assembly (40) and the rotor assembly (30), wherein one of the drive assembly (40) and the rotor assembly (30) has a coil winding (400), and the other thereof has a magnet portion (300) matching the coil winding (400). The brushless motor (1000) further comprises a circuit board (50) fixed to the housing (10) and electrically connected to the coil winding (400). The housing (10) is provided with an accommodating space (100) for accommodating the rotating shaft (20) and the rotor assembly (30). The rotating shaft (20) is fixed to the housing (10), and the rotor assembly (30) is rotatably connected to the housing (10) via the rotating shaft (20). The driving assembly (40) is fixed to the housing (10). The orthographic projection of the coil winding (400) in the axial direction of the rotating shaft (20) toward the housing (10) and the orthographic projection of the circuit board (50) in the axial direction of the rotating shaft (20) toward the housing (10) do not overlap with each other. According to the brushless electric motor, space in the thickness direction of the brushless electric motor can be saved, the thickness of the brushless electric motor is reduced, and the difficulty of a welding connection process for the coil winding and the circuit board is reduced.

Description

Brushless Motor

The present invention claims the priority of the Chinese patent application with the application number 202022813022.3 and the invention name "Brushless Motor" filed with the China Patent Office on November 27, 2020, the entire contents of which are incorporated herein by reference.

technical field

The present invention relates to the technical field of motors, in particular to a brushless motor.

Background technique

The brushless motor in the prior art usually includes a casing, a winding coil, a permanent magnet, and a rotating shaft that rotates the permanent magnet on the casing. To supply power to the brushless motor, by changing the alternating frequency and waveform of the current wave input to the winding coil of the brushless motor by the external circuit, a magnetic field rotating around the geometric axis of the motor is formed around the winding coil, and this magnetic field drives the permanent magnet to rotate. Since the circuit board and the winding coil are stacked and arranged so that the circuit board and the winding coil overlap in the thickness direction, the motor needs to have a larger thickness to arrange the circuit board and the winding coil, resulting in a larger thickness of the brushless motor.

Therefore, it is necessary to provide a brushless motor to solve the above technical problems.

technical problem

An object of the present invention is to provide a brushless motor with a smaller thickness.

technical solutions

The technical solution of the present invention is as follows: a brushless motor, comprising a rotating shaft, a rotor assembly assembled on the rotating shaft, a driving assembly coaxially arranged with the rotor assembly, and a drive assembly for carrying the rotating shaft, the driving assembly, and the a casing of the rotor assembly; one of the driving assembly and the rotor assembly has a coil winding, and the other has a magnet portion matched with the coil winding; the brushless motor further includes a motor that is fixed to the casing and A circuit board electrically connected to the coil winding, the casing has a receiving space for accommodating the rotating shaft and the rotor assembly, the rotating shaft is fixed to the casing, and the rotor assembly rotates with the casing through the rotating shaft connected, the drive assembly is fixed on the casing; the orthographic projection of the coil winding along the axis of the rotating shaft towards the casing and the orthographic projection of the circuit board towards the casing along the axis of the rotating shaft do not overlap with each other.

Preferably, the rotor assembly includes the magnet portion, the magnet portion is wound around the outer periphery of the driving assembly, and the rotor assembly further includes a side from the magnet portion away from the driving assembly along the magnet portion The radially extending vanes are arranged at intervals along the circumference of the magnet portion; the vanes are spaced from the inner wall of the casing to form a receiving cavity for accommodating liquid, and the casing is penetrated with a separate cavity with the The liquid inlet and the liquid outlet are communicated, the liquid inlet and the liquid outlet are arranged at intervals, and the rotation of the blade drives the liquid in the receiving cavity to flow toward the liquid outlet.

Preferably, the casing is provided with a first annular groove and a mounting groove spaced apart from each other along a direction perpendicular to the axial direction of the rotating shaft, the coil winding is installed in the first annular groove, and the circuit board includes An inner connecting part electrically connected with the coil winding and an outer connecting part connected with the inner connecting part, the inner connecting part is installed in the installation groove, the outer connecting part is located outside the casing, and is connected with the The inscribed portion is arranged in a direction perpendicular to the axial direction of the rotating shaft.

Preferably, the first annular groove and the installation groove are arranged on the same surface of the housing.

Preferably, the casing is further provided with an escape groove that communicates with the first annular groove and the installation groove, and the brushless motor further comprises an escape groove that is accommodated in the escape groove and bridged between the coil winding and the inner groove. Conductive wires between junctions.

Preferably, the depth of the escape groove along the axial direction of the rotating shaft is smaller than the depths of the first annular groove and the installation groove along the axial direction of the rotating shaft.

Preferably, the casing includes an upper casing and a lower casing, the upper casing and the lower casing are assembled and fixed to form the casing, and the first annular groove and the installation groove are arranged in the lower casing The side away from the upper casing, the side of the lower casing close to the upper casing has an insertion groove for receiving and fixing the rotating shaft and a second annular groove, the first annular groove The second annular groove is wound around the outer circumference of the insertion groove, the second annular groove is wound around the outer circumference of the first annular groove, and the side of the upper casing close to the lower casing has a connection with the rotor. The accommodating groove facing the component, the outer diameter of the accommodating groove is greater than or equal to the outer diameter of the second annular groove, the accommodating groove is assembled with the insertion groove and the second annular groove to form the accommodating space .

Preferably, the magnet part includes a disk body, a cylinder body and a ring casing body, the cylinder body is correspondingly accommodated in the insertion groove and is rotatably connected with the rotating shaft, and the ring casing body is wound around the drive The outer periphery of the component is correspondingly accommodated in the second annular groove, the disk body is arranged around the rotating shaft and is connected between the cylindrical body and the annular sleeve body; the blade is arranged on the annular sleeve body The magnet part has an installation through hole passing through the column body and the disk body; the magnet part is assembled on the rotating shaft through the installation through hole.

Preferably, the upper casing and the lower casing are fixedly connected by a plurality of bolts, the lower casing is provided with a plurality of positioning pins, and the upper casing is provided with positioning holes respectively matched with the plurality of positioning pins .

Preferably, a sealing ring surrounding the cavity is provided between the upper casing and the lower casing.

beneficial effect

The beneficial effect of the present invention is that in the brushless motor provided by the present invention, the relative positional relationship between the coil winding and the circuit board is set such that the orthographic projection of the coil winding toward the casing along the axis of the rotating shaft and the orthographic projection of the circuit board toward the casing along the axis of the rotating shaft are mutually Not overlapping, so that the coil winding and the circuit board are not stacked in the thickness direction of the brushless motor, which can save space in the thickness direction of the brushless motor, and can reduce the thickness of the brushless motor. In addition, the space between the coil winding and the circuit board is large, which facilitates the welding and connection of the coil winding and the circuit board, and can reduce the difficulty of the connection process of the coil winding and the circuit board.

Description of drawings

1 is a schematic three-dimensional structure diagram of a brushless motor of the present invention in a top view direction;

Fig. 2 is another three-dimensional structural schematic diagram of the brushless motor of the present invention in the upward direction;

3 is an exploded view of the three-dimensional structure of the brushless motor of the present invention;

Fig. 4 is a sectional view along line A-A in Fig. 1;

FIG. 5 is a schematic three-dimensional structural diagram of the lower casing of the brushless motor of the present invention in a downward direction;

FIG. 6 is a schematic three-dimensional structural diagram of the lower casing of the brushless motor of the present invention in a top view direction;

7 is a schematic three-dimensional structural diagram of the upper casing of the brushless motor of the present invention in a downward direction;

FIG. 8 is a schematic three-dimensional structure diagram of a permanent magnet of a brushless motor of the present invention viewed from a bottom direction.

Embodiments of the present invention

The present invention will be further described below with reference to the accompanying drawings and embodiments.

Referring to FIGS. 1 to 8 , the brushless motor 1000 includes: a rotating shaft 20 , a rotor assembly 30 assembled on the rotating shaft 20 , a driving assembly 40 arranged coaxially with the rotor assembly 30 , and for carrying the rotating shaft 20 , the driving assembly 40 and The casing 10 of the rotor assembly 30 ; the driving assembly 40 has a coil winding 400 , and the rotor assembly 30 has a magnet part 300 matched with the coil winding 400 ; the brushless motor 1000 further includes a circuit board 50 fixed to the casing 10 and electrically connected to the coil winding 400 , the casing 10 has a receiving space 100 for accommodating the rotating shaft 20 and the rotor assembly 30, the rotating shaft 20 is fixed to the casing 10, the rotor assembly 30 is rotatably connected to the casing 10 through the rotating shaft 20, and the driving assembly 40 is fixed to the casing 10; The orthographic projection toward the housing 10 and the orthographic projection of the circuit board 50 toward the housing 10 along the axial direction of the rotating shaft 20 do not overlap with each other.

It should be understood that in alternative embodiments, the rotor assembly 30 may have coil windings and the drive assembly 40 may have magnet portions that match the coil windings.

In some embodiments, the magnet part 300 is wound around the outer circumference of the driving assembly 40 , and the rotor assembly 30 further includes a blade 310 extending from the side of the magnet part 300 away from the driving assembly 40 in a radial direction of the magnet part 300 , and the blade 310 is along the magnet part 300 . The blades 310 are spaced from the inner wall of the casing 10 to form a receiving cavity 150 for accommodating liquid. The casing 10 is provided with a liquid inlet 110 and a liquid outlet 120 which are respectively communicated with the receiving cavity 150. The liquid inlet 110 and the outlet The liquid ports 120 are arranged at intervals, and the rotation of the blades 310 drives the liquid in the receiving cavity 150 to flow toward the liquid outlet 120 .

In some embodiments, the casing 10 is provided with a first annular groove 141 and a mounting groove 142 spaced apart from each other along a direction perpendicular to the axial direction of the rotating shaft 20, the coil winding 400 is installed in the first annular groove 141, and the circuit board 50 includes The inner connecting portion 51 of the coil winding 400 is electrically connected and the outer connecting portion 52 connected to the inner connecting portion 51 . The shaft 20 is arranged in a vertical direction. In this embodiment, the coil winding 400 and the inner connecting portion 51 of the circuit board 50 are installed in the first annular groove 141 and the installation groove 142 of the housing 10 respectively, so that the overall structure of the brushless motor 1000 is compact and beautiful.

In some embodiments, the first annular groove 141 and the installation groove 142 are disposed on the same side of the housing 10 . In the present embodiment, the first annular groove 141 and the mounting groove 142 are located on the same side of the housing 10 , that is, the coil winding 400 and the internal connection portion 51 of the circuit board 50 are arranged on the same side of the housing 10 , and the coil winding 400 and the circuit board 50 are arranged on the same side of the housing 10 . The distance between the inner connecting parts 51 is short, which facilitates the electrical connection between the coil winding 400 and the inner connecting part 51 of the circuit board 50 .

In some embodiments, the casing 10 includes an upper casing 130 and a lower casing 140 , and the upper casing 130 and the lower casing 140 are assembled and fixed to form the casing 10 .

Further, the first annular groove 141 and the installation groove 142 are disposed on the side of the lower casing 140 away from the upper casing 130 , and the side of the lower casing 140 close to the upper casing 130 has a socket for accommodating and fixing the rotating shaft 20 . The groove 145 and the second annular groove 146, the first annular groove 141 is arranged around the outer circumference of the insertion slot 145, the second annular groove 146 is arranged around the outer circumference of the first annular groove 141, and the upper casing 130 is close to the lower One side of the housing 140 has an accommodating groove 131 facing the rotor assembly 30 , the outer diameter of the accommodating groove 131 is greater than or equal to the outer diameter of the second annular groove 146 , the accommodating groove 131 and the insertion groove 145 and the second annular groove The grooves 146 are assembled to form the receiving space 100 .

In some embodiments, the magnet part 300 includes a disk body 301 , a cylinder body 302 and a ring body 303 . The cylinder body 302 is correspondingly accommodated in the insertion slot 145 and is rotatably connected with the rotating shaft 20 , and the ring body 303 is wound around the drive assembly 40 . The outer circumference is correspondingly accommodated in the second annular groove 146. The disk body 301 is arranged around the rotating shaft 20 and is connected between the column body 302 and the annular sleeve body 303; the blade 310 is arranged on the outer peripheral wall of the annular sleeve body 303; the magnet part 300 There is an installation through hole 304 passing through the column body 302 and the disk body 301 ; the magnet part 300 is assembled on the rotating shaft 20 through the installation through hole 304 . In this embodiment, by staggering the first annular groove 141 from the insertion groove 145 and the second annular groove 146 , the coil winding 400 and the cylinder 302 , the annular sleeve 303 and the blade 310 of the magnet part 300 can be staggered. Being accommodated in the accommodation space 100 of the housing 10 , the coil winding 400 and the magnet part 300 can share part of the thickness space, thereby further saving space in the thickness direction of the brushless motor 1000 and further reducing the thickness of the brushless motor 1000 .

Further, the side of the lower casing 140 away from the upper casing 130 is further provided with an escape groove 143 that communicates with the first annular groove 141 and the installation groove 142 . The conductive wire 410 between the coil winding 400 and the inner connecting portion 51 . In this embodiment, by setting the avoidance groove 143 connecting the first annular groove 141 and the installation groove 142, the conductive wire 410 bridged between the coil winding 400 and the inner connecting portion 51 is routed on the inner side of the lower casing 140, The conductive wire 410 can be protected by the lower case 140 and will not affect the placement of the lower case 140 on other structures.

Preferably, the depth of the escape groove 143 along the axial direction of the rotating shaft 20 is smaller than the depths of the first annular groove 141 and the installation groove 142 along the axial direction of the rotating shaft 20 . In this embodiment, only the avoidance groove 143 with a small processing depth is used to accommodate the conductive wire 410, and the processing is simple.

Further, the upper casing 130 and the lower casing 140 are fixedly connected by a plurality of bolts 60 , the lower casing 140 is provided with a plurality of positioning pins 147 , and the upper casing 130 is provided with positioning holes 132 respectively matched with the plurality of positioning pins 147 . . In this embodiment, a positioning structure is provided on the lower casing 140 and the upper casing 130 to facilitate positioning when the lower casing 140 and the upper casing 130 are fixed; , the upper casing 130 and the lower casing 140 have good tightness, which can ensure that the cavity 100 in the casing 10 has good sealing performance.

Preferably, a sealing ring 70 surrounding the cavity 100 is disposed between the upper casing 130 and the lower casing 140 . In this embodiment, the sealing ring 70 for sealing the cavity 100 is provided between the upper casing 130 and the lower casing 140 , so that the sealing performance of the cavity 100 can be improved, and the compressed air in the cavity 100 is not easily leaked.

In the brushless motor provided by the present invention, the relative positional relationship between the coil winding and the circuit board is set such that the orthographic projection of the coil winding toward the casing along the axis of the rotating shaft and the orthographic projection of the circuit board toward the casing along the axis of the rotating shaft do not overlap each other, so that the coil winding and the The circuit boards are not stacked in the thickness direction of the brushless motor, which can save space in the thickness direction of the brushless motor, and can reduce the thickness of the brushless motor. In addition, the space between the coil winding and the circuit board is large, which facilitates the welding and connection of the coil winding and the circuit board, and can reduce the difficulty of the connection process of the coil winding and the circuit board.

The above are only the embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present invention, but these belong to the present invention. scope of protection.

Claims

A brushless motor includes a rotating shaft, a rotor assembly assembled on the rotating shaft, a driving assembly coaxially arranged with the rotor assembly, and a casing for carrying the rotating shaft, the driving assembly and the rotor assembly; One of the drive assembly and the rotor assembly has a coil winding, and the other has a magnet portion matched with the coil winding; the brushless motor further includes a motor fixed to the housing and electrically connected to the coil winding The circuit board, the casing has a receiving space for accommodating the rotating shaft and the rotor assembly, the rotating shaft is fixed to the casing, the rotor assembly is rotatably connected to the casing through the rotating shaft, and the driving assembly is fixed It is characterized in that the orthographic projection of the coil winding to the housing along the axis of the rotation shaft and the orthographic projection of the circuit board to the housing along the axis of the rotation shaft do not overlap with each other.
The brushless motor according to claim 1, wherein the rotor assembly includes the magnet portion, the magnet portion is wound around the outer periphery of the driving assembly, and the rotor assembly further includes a distance from the magnet portion. One side of the drive assembly extends along the radial direction of the magnet portion, and the vanes are arranged at intervals along the circumference of the magnet portion; the vanes are spaced from the inner wall of the housing to form a accommodating cavity for accommodating liquid, The casing is provided with a liquid inlet and a liquid outlet respectively communicating with the accommodating cavity, the liquid inlet and the liquid outlet are arranged at intervals, and the rotation of the blade drives the liquid in the accommodating cavity toward the The liquid outlet flows.
The brushless motor according to claim 2, wherein the housing is provided with a first annular groove and a mounting groove spaced apart from each other along a direction perpendicular to the axial direction of the rotating shaft, and the coil winding is mounted on the In the first annular groove, the circuit board includes an inner connection part electrically connected with the coil winding and an outer connection part connected with the inner connection part, the inner connection part is installed in the installation groove, and the inner connection part is installed in the installation groove. The outer portion is located outside the casing, and is arranged with the inner portion in a direction perpendicular to the axial direction of the rotating shaft.
The brushless motor according to claim 3, wherein the first annular groove and the installation groove are arranged on the same side of the housing.
The brushless motor according to claim 4, characterized in that: the casing is further provided with an escape groove connecting the first annular groove and the installation groove, and the brushless motor further comprises an escape groove accommodated in the escape groove and bridge the conductive wire between the coil winding and the inner connecting part.
The brushless motor according to claim 5, wherein the depth of the escape groove along the axial direction of the rotating shaft is smaller than the depth of the first annular groove and the installation groove along the axial direction of the rotating shaft.
The brushless motor according to claim 4, wherein the casing comprises an upper casing and a lower casing, the upper casing and the lower casing are assembled and fixed to form the casing, and the first annular groove and the mounting groove is arranged on the side of the lower casing away from the upper casing, and the side of the lower casing close to the upper casing has an insertion groove for receiving and fixing the rotating shaft and a first Two annular grooves, the first annular groove is arranged around the outer circumference of the insertion slot, the second annular groove is arranged around the outer circumference of the first annular groove, and the upper casing is close to the One side of the lower casing has a receiving groove facing the rotor assembly, the outer diameter of the receiving groove is greater than or equal to the outer diameter of the second annular groove, and the receiving groove is connected to the insertion groove. The receiving space is formed by combining with the second annular groove.
The brushless motor according to claim 7, wherein the magnet part comprises a disc body, a cylinder body and a ring sleeve body, and the cylinder body is correspondingly accommodated in the insertion groove and is rotatably connected with the rotating shaft , the ring body is arranged around the outer periphery of the drive assembly and is correspondingly accommodated in the second annular groove, the disk body is arranged around the rotating shaft and is connected between the cylinder and the ring body the blade is arranged on the outer peripheral wall of the ring body; the magnet part has an installation through hole passing through the column body and the disk body; the magnet part is assembled on the Spindle.
The brushless motor according to claim 8, wherein the upper casing and the lower casing are fixedly connected by a plurality of bolts, the lower casing is provided with a plurality of positioning pins, and the upper casing is provided with a plurality of positioning pins. positioning holes respectively matched with the plurality of positioning pins.
The brushless motor according to claim 9, wherein a sealing ring surrounding the cavity is arranged between the upper casing and the lower casing.