CN210297380U

CN210297380U - DC brushless inner rotor motor

Info

Publication number: CN210297380U
Application number: CN201921797664.XU
Authority: CN
Inventors: 彭启超
Original assignee: Foshan Yingbiyou Motor Co ltd
Current assignee: Foshan Yingbiyou Motor Co ltd
Priority date: 2019-10-24
Filing date: 2019-10-24
Publication date: 2020-04-10
Anticipated expiration: 2029-10-24

Abstract

The utility model discloses a DC brushless inner rotor motor, which comprises a motor shell, a stator assembly and a rotor assembly arranged in the motor shell, wherein the stator assembly comprises a stator core, the rotor assembly comprises a magnetic ring, a rotating shaft and a plastic body, the magnetic ring, the rotating shaft and the plastic body are arranged in the stator core, the plastic body is in a column shape, the rotating shaft penetrates through the plastic body, the plastic body fixes the rotating shaft and the magnetic ring on the plastic body during injection molding, the plastic body comprises an integrally formed main body and a limit ring, the limit ring is arranged outside the inner cavity of the magnetic ring, the limit ring is arranged at two ends of the main body, the diameter of the limit ring is larger than that of the main body, the limit ring is arranged close to the wall surface of the magnetic ring, and the DC brushless inner rotor motor has good vibration damping effect and small vibration in the mode, and the manufacturing cost is low, the production process is simple, and the method is suitable for batch production.

Description

DC brushless inner rotor motor

Technical Field

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

Background

In the existing brushless inner rotor motor, the mode of fixing the annular magnet is various, some rotor cores are used as internal supports, and rotor cores are used for supporting, but the problems that the inner wall of the annular magnet is required to be high in machining precision, the concentricity is large when the inner wall of the annular magnet and the outer wall of the rotor core are fixed by adding glue, the annular magnet is connected with the rotor cores and a rotating shaft in a hard connection mode, and the vibration reduction effect is poor are caused; moreover, the bonded annular magnet and the iron core need to enter a rotating shaft, so that the production process is complicated; some magnets are directly injection molded magnets, injection molding is carried out on the magnets and the outer wall of the rotating shaft through injection molding magnetic materials, and the performance of the high-performance motor cannot be achieved due to the fact that the surface magnetism of the injection molding magnetic materials is low; when the injection molding magnetic outer diameter is larger, the rotating shaft is smaller, the dosage of the injection molding magnetic material is more, and the overall cost is higher. Therefore, there is a need to develop a new brushless inner rotor motor.

In conclusion, the problems of high cost, complicated production process, poor surface magnetism of the magnet, poor vibration damping effect, large vibration and the like generally exist in the prior art and influence the performance of the motor.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a brushless inner rotor motor of direct current, the damping effect is good, the vibration is little, low in manufacturing cost moreover, and production simple process is fit for batch production.

In order to achieve the above purpose, the technical scheme of the utility model has:

the utility model provides a direct current brushless inner rotor motor, includes motor housing and locates stator module and rotor subassembly in the motor housing, stator module includes stator core, the rotor subassembly is including installing magnetic ring, pivot in the stator core and with the plastic body of magnetic ring inner chamber suit installation, just the plastic body is the column, it has run through on the plastic body the pivot, the plastic body fixes pivot and magnetic ring shaping on the plastic body when moulding plastics, the plastic body includes integrated into one piece's main part and spacing ring, just the spacing ring is located outside the magnetic ring inner chamber, all have on the both ends of main part the spacing ring, the diameter ratio of spacing ring the diameter of main part is big, the spacing ring with the wall of magnetic ring is close to setting mutually.

The plastic body is provided with a plurality of heat dissipation through holes, and the plurality of heat dissipation through holes are arranged on the plastic body in a circular array by taking the center axis of the plastic body as the center of a circle.

Wherein, the heat dissipation through-hole is fan-shaped.

The rotor assembly further comprises a bearing, and the bearings are rotatably mounted on two sides of the rotating shaft.

The stator assembly further comprises a front wire frame and a rear wire frame, and the front wire frame and the rear wire frame are respectively fixedly arranged on two sides of the stator core.

The stator assembly further comprises a stator coil, and the stator coil is arranged on the front wire frame and the rear wire frame.

The motor shell comprises a front end cover and a rear end cover, and the front end cover and the rear end cover are mutually installed and fixed through bolts.

Wherein, the surface of the rotating shaft is provided with knurls.

The utility model discloses a brushless inner rotor motor of direct current, its beneficial effect is: 1. the rotating shaft and the magnetic ring form a whole under the action of the plastic body, and the rotating shaft and the magnetic ring form tight fit, so that the axial and radial acting forces generated when the motor rotates can be well borne, the vibration reduction effect is excellent, and the vibration is small; 2. the plastic body forms a limiting ring with a diameter larger than that of the main body on two sides during injection molding, the limiting ring is arranged close to the wall surface of the magnetic ring and outside the inner cavity of the magnetic ring, so that the connection stability between the plastic body and the magnetic ring is further enhanced, the synchronization of the action between the rotating shaft and the magnetic ring is effectively ensured, and the noise generated during the work is further reduced; 3. the manufacturing cost is low, the production process is simple, and the method is suitable for batch production.

Drawings

Fig. 1 is a schematic structural diagram of a dc brushless inner rotor motor;

FIG. 2 is a schematic view of a plastic body.

The reference numbers in the figures illustrate: 11. a front end cover; 12. a rear end cap; 2. a stator core; 3. a magnetic ring; 4. a rotating shaft; 5. a plastic body; 51. a main body; 52. a limiting ring; 53. a heat dissipating through hole; 6. a bearing; 7. a front wire frame; 8. a rear wire rack.

Detailed Description

The present invention is described with reference to the accompanying drawings.

As shown in fig. 1 to 2, as a preferred embodiment of the present invention:

a DC brushless inner rotor motor comprises a motor shell, a stator component and a rotor component which are arranged in the motor shell, the stator component comprises a stator core 2, the rotor component comprises a magnetic ring 3 arranged in the stator core 2, a rotating shaft 4 and a plastic body 5 which is arranged corresponding to the inner cavity of the magnetic ring 3, the plastic body 5 is columnar, the rotating shaft 4 penetrates through the plastic body 5, the rotating shaft 4 and the magnetic ring 3 are formed and fixed on the plastic body 5 during injection molding of the plastic body 5, the plastic body 5 comprises a main body 51 and a limiting ring 52 which are integrally formed, the limit ring 52 is positioned outside the inner cavity of the magnetic ring 3, the limit ring 52 is arranged at both ends of the main body 51, the diameter of the limit ring 52 is larger than that of the main body 51, and the limit ring 52 is arranged close to the wall surface of the magnetic ring 3.

It should be noted that the molding method among the plastic body 5, the rotating shaft 4 and the magnetic ring 3 is as follows: the rotating shaft 4 and the magnetic ring 3 are placed into an injection mold in advance for fixing, then high-temperature plastics are added into the mold, the high-temperature plastics are cooled to form the plastic body 5 under the action of the mold, the rotating shaft 4 and the magnetic ring 3 are mutually fixed and form tight fit under the action of the plastic body 5 in the forming process through the plastic body 5, axial and radial forces generated when the motor rotates can be borne, the vibration reduction effect is excellent, and vibration is small.

Furthermore, the plastic body 5 forms a limiting ring 52 with a diameter larger than that of the main body 51 on two sides during injection molding, the limiting ring 52 is arranged close to the wall surface of the magnetic ring 3 and outside the inner cavity of the magnetic ring 3, so that the connection stability between the plastic body 5 and the magnetic ring 3 is further enhanced, the synchronization of the actions between the rotating shaft 4 and the magnetic ring 3 is effectively ensured, and the noise generated during the work is further reduced.

The limiting ring 52 is located outside the inner cavity of the magnetic ring 3, so that the whole plastic body 5 is firmly installed in the magnetic ring 3, and the closeness between the rotating shaft 4 and the magnetic ring 3 is enhanced. The stop collar 52 is formed by injection molding in a corresponding shape on a mold.

Preferably, in order to better reduce the temperature inside the motor and prolong the service life of the motor, the plastic body 5 is provided with a plurality of heat dissipation through holes 53, and the plurality of heat dissipation through holes 53 are arranged in a circular array on the plastic body 5 by taking the central axis of the plastic body 5 as the center of a circle.

The heat dissipation through holes 53 arranged in a circular array enable the internal temperature to be more uniformly diffused, and the heat dissipation efficiency is improved.

Wherein, in order to increase the heat dissipation area, the heat dissipation through hole 53 is fan-shaped.

Preferably, in order to better match the rotating shaft 4, the magnetic ring 3 and the stator core 2, and provide support for rotation among the rotating shaft, the magnetic ring and the stator core, and reduce the friction coefficient during the movement of the rotating shaft, the rotor assembly further comprises a bearing 6, and the bearing 6 is rotatably mounted on both sides of the rotating shaft 4.

Preferably, the stator assembly further comprises a front bobbin 7 and a rear bobbin 8, and the front bobbin 7 and the rear bobbin 8 are respectively installed and fixed on both sides of the stator core 2.

Further, the stator assembly further comprises a stator coil, and the stator coil is arranged on the front bobbin 7 and the rear bobbin 8.

Preferably, the motor housing comprises a front end cover 11 and a rear end cover 12, and the front end cover 11 and the rear end cover 12 are fixed to each other by bolts in order to facilitate the detachment and installation between the front end cover 11 and the rear end cover 12.

Preferably, the surface of the rotating shaft 4 is knurled in order to better bear the force from the axial direction and the radial direction when the motor rotates at a high speed.

The utility model discloses a brushless inner rotor motor of direct current, its beneficial effect is: 1. the rotating shaft 4 and the magnetic ring 3 form a whole under the action of the plastic body 5, and a tight fit is formed between the rotating shaft 4 and the magnetic ring 3, so that the axial and radial acting forces generated when the motor rotates can be well borne, the vibration reduction effect is excellent, and the vibration is small; 2. the plastic body 5 forms a limiting ring 52 with a diameter larger than that of the main body 51 on two sides during injection molding, the limiting ring 52 is arranged close to the wall surface of the magnetic ring 3 and outside the inner cavity of the magnetic ring 3, the connection stability between the plastic body 5 and the magnetic ring 3 is further enhanced, the synchronization of the actions between the rotating shaft 4 and the magnetic ring 3 is effectively ensured, and the noise generated during the work is further reduced; 3. the manufacturing cost is low, the production process is simple, and the method is suitable for batch production.

Variations and modifications to the above-described embodiments may occur to those skilled in the art, in light of the above teachings and teachings. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should fall within the protection scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. The utility model provides a direct current brushless inner rotor motor, includes motor housing and locates stator module and rotor subassembly in the motor housing, stator module includes stator core, its characterized in that, the rotor subassembly is including installing magnetic ring, pivot in the stator core and with the plastic body of magnetic ring inner chamber suit installation, just the plastic body is the column, it has run through on the plastic body the pivot, the plastic body fixes pivot and magnetic ring shaping on the plastic body when moulding plastics, the plastic body includes integrated into one piece's main part and spacing ring, just the spacing ring is located outside the magnetic ring inner chamber, all have on the both ends of main part the spacing ring, the diameter ratio of spacing ring the diameter of main part is big, the spacing ring with the wall of magnetic ring is close to the setting mutually.

2. The dc brushless inner rotor motor of claim 1, wherein the plastic body has a plurality of heat dissipating through holes, and the plurality of heat dissipating through holes are arranged in a circular array on the plastic body around a central axis of the plastic body.

3. The dc brushless inner rotor motor of claim 2, wherein the heat dissipating through-holes are fan-shaped.

4. The dc brushless inner rotor motor of claim 1, wherein the rotor assembly further comprises bearings rotatably mounted on both sides of the shaft.

5. The dc brushless inner rotor motor of claim 1, wherein the stator assembly further comprises a front bobbin and a rear bobbin, the front bobbin and the rear bobbin being respectively mounted and fixed on both sides of the stator core.

6. The dc brushless inner rotor motor of claim 5, wherein the stator assembly further comprises stator coils, the stator coils being disposed on both the front and rear bobbins.

7. The dc brushless inner rotor motor of claim 1, wherein the motor housing comprises a front end cap and a rear end cap, and the front end cap and the rear end cap are fixed to each other by bolts.

8. The dc brushless inner rotor motor of claim 1, wherein the shaft surface is knurled.