CN210806990U

CN210806990U - Brushless DC motor

Info

Publication number: CN210806990U
Application number: CN201921750472.3U
Authority: CN
Inventors: 陆锡佳; 彭湃; 陆国浇; 潘艳; 潘华; 沈朝晖; 王成合; 覃伟; 陈林海; 彭小云
Original assignee: Foshan Nanhai Nanyang Electric Appliance&motor Co ltd
Current assignee: Foshan Nanhai Nanyang Electric Appliance&motor Co ltd
Priority date: 2019-10-17
Filing date: 2019-10-17
Publication date: 2020-06-19
Anticipated expiration: 2029-10-17

Abstract

The utility model discloses a brushless DC motor, including casing, drive plate and pivot, the pivot is passed the casing and is connected with the casing rotation, be provided with the fan in the casing, the fan is connected and rotatory along with the pivot, the drive plate sets up in the epaxial one side of fan in the pivot. When the motor works, the fan rotates along with the rotation of the rotating shaft, so that the air flow at the periphery of the driving plate is accelerated, the driving plate can be radiated in time, the heat distribution in the motor is more uniform, and the heat in the subsequent motor is favorably conducted to the outside of the motor.

Description

Brushless DC motor

Technical Field

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

Background

The motor generally comprises a rotor, a stator, a rotating shaft and a casing, wherein the rotor is fixed in the casing, the casing is relatively fixed, the rotor rotates relative to the casing and the stator, and in the rotating process, as the stator is arranged in the casing, in the working process of the motor, elements in the motor can generate heat, the generated heat can enable the casing to gather a large amount of heat, but the position of a heating component is relatively concentrated, so that the heat distribution in the casing is relatively uneven. The heat inside the casing needs to be conducted to the casing surface, then the casing surface takes place thermal transmission with the external world through the mode of convection heat transfer, because the heat of casing inside is inhomogeneous, the heat of transmitting the casing also demonstrates inhomogeneous state, leads to the radiating effect to reduce.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: a brushless DC motor is provided, which can make the heat distribution in the casing more uniform.

The utility model provides a solution of its technical problem is:

a brushless direct current motor comprises a machine shell, a driving plate and a rotating shaft, wherein the rotating shaft penetrates through the machine shell and is rotatably connected with the machine shell, a fan is arranged in the machine shell, the fan is connected with the rotating shaft and rotates along with the rotating shaft, and the driving plate is arranged on one side of the fan in the axial direction of the rotating shaft.

As a further improvement of the technical scheme, a rotor core is arranged in the casing and fixedly connected with the rotating shaft, the rotor core is arranged on one side, away from the drive plate, of the fan, and the rotor core is fixedly connected with a permanent magnet through a connecting piece.

As a further improvement of the above technical solution, the permanent magnet is provided as a sintered ferrite bead.

As a further improvement of the technical scheme, the connecting piece and the fan are integrally formed through injection molding.

As a further improvement of the technical scheme, the rotor core is provided with a plurality of through holes.

As a further improvement of the technical scheme, a plurality of through holes are distributed in an array around the circumference of the rotating shaft.

As a further improvement of the technical scheme, the casing is provided with positioning grooves on two surfaces on the axis of the rotating shaft.

As a further improvement of the above technical solution, the fan is a centrifugal fan.

The utility model has the advantages that: when the motor works, the fan rotates along with the rotation of the rotating shaft, so that the air flow at the periphery of the driving plate is accelerated, the driving plate can be radiated in time, the heat distribution in the motor is more uniform, and the heat in the subsequent motor is favorably conducted to the outside of the motor.

The utility model is used for motor technical field.

Drawings

In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures represent only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from these figures without inventive effort.

FIG. 1 is a schematic sectional view of the present invention;

fig. 2 is a side view of the present invention.

In the figure, 1, a housing; 11. positioning a groove; 2. a rotating shaft; 21. a bearing; 22. a vibration damping rubber ring; 3. a stator core; 31. an insulating wire frame; 32. a drive plate; 4. a rotor core; 41. a through hole; 5. a connecting member; 51. a centrifugal fan; 6. and sintering the ferrite magnetic ring.

Detailed Description

The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive labor based on the embodiments of the present invention all belong to the protection scope of the present invention. In addition, all the coupling/connection relationships mentioned herein do not mean that the components are directly connected, but mean that a better coupling structure can be formed by adding or reducing coupling accessories according to specific implementation conditions. All technical characteristics in the invention can be interactively combined on the premise of not conflicting with each other.

Referring to fig. 1 and 2, a brushless dc motor includes a housing 1 and a rotation shaft 2. The casing 1 is formed in a cylindrical shape and assembled by two casings. The rotating shaft 2 penetrates through the center of the casing 1. Three positioning grooves 11 are respectively formed in two ends of the machine shell 1, and the three positioning grooves 11 are distributed around the axis of the rotating shaft 2 in a circumferential array mode. The three positioning grooves 11 perform vibration damping installation processing on the motor and prevent the casing 1 from rotating. Two bearings 21 are arranged on the rotating shaft 2, and the two bearings 21 are both arranged in the machine shell 1 and are rotatably connected with the machine shell 1. A damping rubber ring 22 is arranged between the two bearings 21 and the machine shell 1. The vibration damping rubber ring 22 buffers the vibration of the motor rotor during rotation and absorbs partial kinetic energy, so that the motor is prevented from generating large-amplitude high-frequency vibration.

The lateral wall fixedly connected with a plurality of stator core 3 of casing 1, a plurality of stator core 3 revolutes 2 circumference array settings of axis of rotation at the inner wall of casing 1. The stator core 3 is wound with a stator winding. The stator core 3 is provided with insulating wire frames 31 on both sides of the rotating shaft 2 in the axial direction, and the two insulating wire frames 31 clamp the stator core 3 through mutual insertion. Two insulating wire frames 31 are fixed on the stator core 3 in an inserting mode, and the production efficiency of the motor is improved.

A rotor core 4 is fixedly connected to the rotating shaft 2 at a position corresponding to the stator core 3. The rotor core 4 is provided with a plurality of through holes 41, the through holes 41 enable the air at the two ends of the rotor core 4 to be communicated with each other, when one end of the rotor core generates a large amount of heat, the air flow can flow from the through holes 41 to the other end, the air at the two ends has more spaces to realize exchange, and the heat can be kept relatively balanced at the two ends of the rotor core 4. And the through holes 41 can reduce the weight of the rotor core 4 and the rotational inertia, thereby optimizing the dynamic response of the motor. A plurality of through holes 41 are distributed in a circumferential array about the axis of the shaft 2. The through holes 41 distributed in the circumferential array play a balance role, and the phenomenon that the uneven arrangement of the through holes 41 causes the increase of unbalanced vibration vectors during rotation to cause strong vibration during the working of the motor is avoided. One side of the rotor core 4 far away from the rotating shaft 2 is fixedly connected with a permanent magnet through a connecting piece 5. The permanent magnet is arranged as a sintered ferrite magnetic ring 6, and the ferrite has low cost; the temperature stability is good; the rust is not easy to occur; the motor has the advantages of low density and the like, and can reduce the cost of raw materials, prolong the service life of the motor, reduce the overall weight of the motor and the like when being used on the motor.

One side of the connecting piece 5 in the axial direction of the rotating shaft 2 is provided with a fan, and the fan and the connecting piece 5 are integrally formed through injection molding. The fan is fixedly connected with the connecting piece 5 and integrally formed, so that the steps of the integral assembling process of the motor are reduced, and the structure inside the motor is more compact. The fan is set as a centrifugal fan 51, the centrifugal fan 51 rotates along with the rotation of the rotating shaft 2, air flow is generated around the driving plate 32, the driving plate 32 can be subjected to timely heat dissipation, the heat distribution in the motor is more uniform, and the heat in the subsequent motor is favorably conducted to the outside of the motor.

A drive plate 32 is arranged in the casing 1, the drive plate 32 is arranged on one side of the fan far away from the rotor core 4, the drive plate 32 is fixedly connected with the insulating wire frame 31, and the drive plate 32 is arranged on one side of the rotor core 4 in the axial direction of the rotating shaft 2.

While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the details of the embodiments shown, but is capable of various modifications and substitutions without departing from the spirit of the invention.

Claims

1. A brushless DC motor, characterized in that: including casing (1), drive plate (32) and pivot (2), pivot (2) pass casing (1) and rotate with casing (1) and be connected, be provided with the fan in casing (1), the fan is connected and along with pivot (2) rotation with pivot (2), drive plate (32) set up in the fan at the epaxial one side of pivot (2).

2. A brushless dc motor according to claim 1, wherein: be provided with rotor core (4) in casing (1), rotor core (4) and pivot (2) fixed connection, rotor core (4) set up in the fan and keep away from one side of drive plate (32), rotor core (4) are through connecting piece (5) fixedly connected with permanent magnet.

3. A brushless dc motor according to claim 2, wherein: the permanent magnet is arranged as a sintered ferrite bead (6).

4. A brushless dc motor according to claim 2, wherein: the connecting piece (5) and the fan are integrally formed through injection molding.

5. A brushless dc motor according to claim 2, wherein: the rotor iron core (4) is provided with a plurality of through holes (41).

6. A brushless DC motor according to claim 5, characterized in that: the through holes (41) are distributed in a circumferential array around the rotating shaft (2).

7. A brushless dc motor according to claim 1, wherein: the casing (1) is provided with positioning grooves (11) on two surfaces on the axis of the rotating shaft (2).

8. A brushless dc motor according to claim 1, wherein: the fan is a centrifugal fan (51).