CN213151787U

CN213151787U - Brushless motor

Info

Publication number: CN213151787U
Application number: CN202021801197.6U
Authority: CN
Inventors: 单瑜彤; 刘文娟; 刘承威; 张永良
Original assignee: Shenzhen Weizhen Motor Co ltd
Current assignee: Shenzhen Weizhen Motor Co ltd
Priority date: 2020-08-25
Filing date: 2020-08-25
Publication date: 2021-05-07
Anticipated expiration: 2030-08-25

Abstract

The utility model belongs to the technical field of motors, in particular to a brushless motor, which comprises a stator part and a rotor part, wherein, the stator part comprises a base, a stator component coaxially fastened with the base, and an inner rolling bearing and an outer rolling bearing which are respectively arranged at the upper port and the lower port of the base, and the inner rolling bearing and the outer rolling bearing are respectively in clearance fit with the corresponding ports; the rotor part is connected with the stator part rotation, and the rotor part includes the rotor shell, with the rotor subassembly of the coaxial fastening of rotor shell and with the pivot of the coaxial fastening of rotor shell, interior rolling bearing and outer rolling bearing overlap respectively and locate the pivot and fasten with the pivot, the both ends of pivot are exposed in rotor shell and base respectively. With this structural design, because both ends mouth clearance fit about interior rolling bearing and outer rolling bearing and the base, consequently can effectively avoid appearing card unusual such as dead with interior rolling bearing after the pivot tight fit and outer rolling bearing, effectual reliability that has promoted this brushless motor then.

Description

Brushless motor

Technical Field

The utility model relates to the technical field of electric machines, especially, relate to a brushless motor.

Background

In the brushless motor in the related art, due to the fact that the structural design is not reasonable enough, after the inner rolling bearing and the outer rolling bearing are matched with the upper end port and the lower end port of the base, the inner rolling bearing and the outer rolling bearing are stuck or the rotating noise is too large, and the brushless motor is improved.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a brushless motor, this brushless motor stable in structure is reliable, can effectively avoid appearing card unusual such as dead after interior rolling bearing and outer rolling bearing and the base assembly.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a brushless motor comprising:

the stator part comprises a base, a stator component coaxially fastened with the base, and an inner rolling bearing and an outer rolling bearing which are respectively arranged at the upper port and the lower port of the base, wherein the inner rolling bearing and the outer rolling bearing are respectively in clearance fit with the corresponding ports;

rotor portion, with stator portion rotates and is connected, rotor portion include the rotor shell, with the rotor subassembly of the coaxial fastening of rotor shell and with the pivot of the coaxial fastening of rotor shell, interior rolling bearing with outer rolling bearing overlaps respectively and locates the pivot and with the pivot fastening, the both ends of pivot expose respectively in the rotor shell with the base.

The rotor assembly comprises a fixed frame and a plurality of magnetic sheets which are circumferentially and uniformly distributed on the fixed frame.

The fixing frame is arranged in an annular shape, and a plurality of accommodating positions for mounting the magnetic sheets are uniformly distributed on the circumferential direction of the outer peripheral surface of the fixing frame.

The space between the two side walls of the containing position is gradually narrowed from outside to inside along the radial direction of the fixing frame.

The outer diameter of a magnetic group formed by a plurality of magnetic sheets uniformly distributed on the fixing frame is larger than the inner diameter of the rotor shell.

Wherein, stator module include the iron core, with two insulating pieces of iron core tow sides matched with, around locating the iron core with the coil of insulating piece and with one of them insulating piece matched with circuit board.

The circuit board comprises a reinforcing plate and a flexible circuit board covered on the reinforcing plate, and a golden finger which is conveniently electrically connected with an external power supply device is arranged at the exposed end of the flexible circuit board.

The base is provided with a fixed shaft used for sleeving the stator assembly, the fixed shaft coaxially penetrates through a mounting hole, the upper end of the mounting hole is provided with the inner rolling bearing, and the lower end of the mounting hole is provided with the outer rolling bearing.

The outer peripheral surface of the fixed shaft is provided with a positioning groove along the axial direction of the fixed shaft, and the positioning groove is matched with a bulge convexly arranged in the iron core mounting hole.

The upper end port and the lower end port of the mounting hole are both provided with step holes, a gasket is arranged between the step surface of the step hole and the outer rolling bearing at the lower end port of the mounting hole, the outer rolling bearing is bonded with the step holes through glue, and one end of the rotating shaft, which is exposed out of the outer rolling bearing, is provided with a clamp spring.

The beneficial effects of the utility model reside in that: the utility model discloses a brushless motor, which comprises a stator part and a rotor part, wherein the stator part comprises a base, a stator component coaxially fastened with the base, and an inner rolling bearing and an outer rolling bearing which are respectively arranged at the upper port and the lower port of the base, and the inner rolling bearing and the outer rolling bearing are respectively in clearance fit with the corresponding ports; the rotor part is connected with the stator part rotation, and the rotor part includes the rotor shell, with the rotor subassembly of the coaxial fastening of rotor shell and with the pivot of the coaxial fastening of rotor shell, interior rolling bearing and outer rolling bearing overlap respectively and locate the pivot and fasten with the pivot, the both ends of pivot are exposed in rotor shell and base respectively. With this structural design, because both ends mouth clearance fit about interior rolling bearing and outer rolling bearing and the base, consequently can effectively avoid appearing card unusual such as dead with interior rolling bearing after the pivot tight fit and outer rolling bearing, effectual reliability that has promoted this brushless motor then.

Drawings

Fig. 1 is a sectional view of a brushless motor according to the present invention.

Fig. 2 is an isometric view of the stator portion of fig. 1.

Fig. 3 is an exploded view of the stator portion of fig. 2.

Fig. 4 is an isometric view of the rotor assembly of fig. 1.

Fig. 5 is an exploded view of the rotor assembly of fig. 4.

In the figure:

1. a stator portion; 11. a base; 111. a fixed shaft; 1111. positioning a groove; 121. an iron core; 122. an insulating sheet; 123. a coil; 124. a circuit board; 1241. a reinforcing plate; 1242. a flexible circuit board; 13. an inner rolling bearing; 14. an outer rolling bearing; 15. a gasket; 16. a clamp spring;

2. a rotor portion; 21. a rotor case; 22. a rotor assembly; 221. a fixed mount; 2211. a storage position; 222. a magnetic sheet; 23. a rotating shaft.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

Referring to fig. 1 to 5, the present embodiment provides a brushless motor, including a stator portion 1 and a rotor portion 2, specifically, the stator portion 1 includes a base 11, a stator assembly coaxially fastened to the base 11, and an inner rolling bearing 13 and an outer rolling bearing 14 respectively disposed at upper and lower ports of the base 11, and the two rolling bearings are respectively in clearance fit with the corresponding ports; more specifically, the stator assembly includes a core 121, two insulating sheets 122 coupled to opposite sides of the core 121, a coil 123 wound around the core 121 and the insulating sheets 122, and a circuit board 124 coupled to one of the insulating sheets 122.

Preferably, the circuit board 124 in this embodiment includes a reinforcing board 1241 and a flexible circuit board 1242 covering the reinforcing board 1241, and an exposed end of the flexible circuit board 1242 is provided with a gold finger for facilitating electrical connection with an external power supply device. The reinforcing plate 1241 and the flexible circuit board 1242 are perforated with round holes for matching with the insulating sheet 122, and the stator assembly assembled by the above structure is sleeved on the base 11.

Further, in order to facilitate the installation and fixation of the inner rolling bearing 13, the outer rolling bearing 14 and the stator assembly, the base 11 in this embodiment is provided with a fixing shaft 111 for sleeving the stator assembly, the fixing shaft 111 is coaxially provided with an installation hole in a penetrating manner, the upper end of the installation hole is provided with the inner rolling bearing 13, and the lower end of the installation hole is provided with the outer rolling bearing 14.

More specifically, in order to facilitate the positioning of the inner rolling bearing 13 and the outer rolling bearing 14, stepped holes are respectively formed at the upper and lower ports of the mounting hole in the present embodiment, and the inner rolling bearing 13 and the outer rolling bearing 14 are respectively matched with the stepped holes at the two ports.

Furthermore, in this embodiment, a gasket 15 is disposed between the step surface of the lower step hole and the outer rolling bearing 14, the outer rolling bearing 14 is bonded to the step hole through glue, and a clamp spring 16 is disposed at one end of the rotating shaft 23 exposed out of the outer rolling bearing 14, so as to fix the rotating shaft 23 and the stator portion 1.

The stator assembly adopting the structural design can firstly sleeve the inner rolling bearing 13 tightly matched with the rotating shaft to the rotating shaft when being assembled with the rotor part 2, then the rotating shaft is penetrated through the mounting hole, then the gasket 15 is sleeved at one end of the rotating shaft exposed out of the base 11, then the outer rolling bearing 14 tightly matched with the rotating shaft is sleeved to the rotating shaft, and finally the clamp spring 16 is clamped at the exposed end of the rotating shaft.

In this embodiment, because interior rolling bearing 13 and outer rolling bearing 14 all with the pivot tight fit, consequently, assembly error when in order to compensate interior rolling bearing 13 and outer rolling bearing 14 and the cooperation of pivot 23, it is dead to avoid interior rolling bearing 13 and outer rolling bearing 14 to cooperate with the mounting hole after the card, interior rolling bearing 13 and outer rolling bearing 14 in this embodiment all adopt loose fit with two step holes of mounting hole, thereby not only do benefit to the assembly of rotor portion 2 and stator portion 1, also can effectively avoid interior rolling bearing 13 and outer rolling bearing 14 to cause the card to die or rotor portion 2 to rotate unusually simultaneously because of assembly error.

Furthermore, in the present embodiment, in order to correctly mount the iron core 121, a positioning groove 1111 is formed on the outer circumferential surface of the fixing shaft 111 along the axial direction of the fixing shaft 111, and the positioning groove 1111 is engaged with a protrusion protruding into the iron core mounting hole.

More specifically, the rotor portion 2 rotatably connected to the stator portion 1 in this embodiment includes a rotor housing 21, a rotor assembly 22 coaxially fastened to the rotor housing 21, and a rotating shaft 23 coaxially fastened to the rotor housing 21, the inner rolling bearing 13 and the outer rolling bearing 14 are respectively pressed on the rotating shaft 23 and fastened to the rotating shaft 23, and two ends of the rotating shaft 23 are respectively exposed out of the rotor housing 21 and the base 11.

Preferably, the rotor assembly 22 in this embodiment includes a fixing frame 221 and a plurality of magnetic sheets 222 uniformly distributed on the fixing frame 221 in the circumferential direction, the fixing frame 221 is disposed in an annular shape, a plurality of accommodating positions 2211 for installing the magnetic sheets 222 are uniformly distributed on the outer circumferential surface of the fixing frame 221 in the circumferential direction, in order to facilitate the magnetic sheets 222 to be tightly fitted with the rotor casing 21 and avoid being fixed by adhesion, in this embodiment, the distance between the two side walls of the accommodating positions 2211 is gradually narrowed from the outside to the inside along the radial direction of the fixing frame 221, and the outer diameter of a magnetic group formed by the plurality of magnetic sheets 222 uniformly distributed on the fixing frame 221 is greater than the. The rotor assembly 22 can be pressed into the rotor housing 21 by means of an external jig when the rotor assembly 22 is assembled with the rotor housing 21, thereby avoiding the troubles caused by the adhesion using glue in the related art.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious modifications, rearrangements and substitutions without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims

1. A brushless motor, comprising:

the stator part (1) comprises a base (11), a stator component coaxially fastened with the base (11), and an inner rolling bearing (13) and an outer rolling bearing (14) which are respectively arranged at the upper port and the lower port of the base (11), wherein the inner rolling bearing (13) and the outer rolling bearing (14) are respectively in clearance fit with the corresponding ports;

rotor portion (2), with stator portion (1) rotates to be connected, rotor portion (2) include rotor shell (21), with rotor subassembly (22) of rotor shell (21) coaxial fastening and with pivot (23) of rotor shell (21) coaxial fastening, interior rolling bearing (13) with outer rolling bearing (14) are located respectively the cover pivot (23) and with pivot (23) fastening, the both ends of pivot (23) expose respectively in rotor shell (21) with base (11).

2. A brushless electric machine according to claim 1, wherein the rotor assembly (22) comprises a stationary frame (221), and a plurality of magnetic sheets (222) circumferentially distributed on the stationary frame (221).

3. The brushless motor according to claim 2, wherein the fixing frame (221) is annular, and a plurality of receiving positions (2211) for mounting the magnetic sheet (222) are circumferentially distributed on the outer circumferential surface of the fixing frame (221).

4. A brushless electric machine according to claim 3, wherein the distance between the two side walls of the receiving position (2211) is gradually narrowed from outside to inside along the radial direction of the fixing frame (221).

5. A brushless electric machine according to claim 4, wherein the outer diameter of the magnetic group formed by the plurality of magnetic sheets (222) uniformly distributed on the fixing frame (221) is larger than the inner diameter of the rotor housing (21).

6. A brushless electric machine according to claim 1, wherein the stator assembly comprises a core (121), two insulating sheets (122) coupled to opposite surfaces of the core (121), coils (123) wound around the core (121) and the insulating sheets (122), and a circuit board (124) coupled to one of the insulating sheets (122).

7. The brushless motor according to claim 6, wherein the circuit board (124) comprises a reinforcing plate (1241) and a flexible circuit board (1242) covering the reinforcing plate (1241), and the exposed end of the flexible circuit board (1242) is provided with a gold finger for facilitating electrical connection with an external power supply device.

8. The brushless motor according to claim 1, wherein the base (11) is provided with a fixing shaft (111) for sleeving the stator assembly, the fixing shaft (111) is coaxially provided with a mounting hole in a penetrating manner, the upper end of the mounting hole is provided with the inner rolling bearing (13), and the lower end of the mounting hole is provided with the outer rolling bearing (14).

9. The brushless motor according to claim 8, wherein the outer circumferential surface of the fixed shaft (111) is formed with a positioning groove (1111) along the axial direction of the fixed shaft (111), and the positioning groove (1111) is engaged with a protrusion protruding into the core mounting hole.

10. The brushless motor according to claim 8, wherein step holes are formed in upper and lower ports of the mounting hole, a gasket (15) is disposed between a step surface of the step hole in the lower port of the mounting hole and the outer rolling bearing (14), the outer rolling bearing (14) and the step hole are bonded by glue, and a clamp spring (16) is disposed at an end of the rotating shaft (23) exposed out of the outer rolling bearing (14).