CN215601165U

CN215601165U - Brushless motor

Info

Publication number: CN215601165U
Application number: CN202121803396.5U
Authority: CN
Inventors: 黄正滨
Original assignee: Jiangmen Runsheng Electromechanical Co ltd
Current assignee: Jiangmen Runsheng Electromechanical Co ltd
Priority date: 2021-08-03
Filing date: 2021-08-03
Publication date: 2022-01-21
Anticipated expiration: 2031-08-03

Abstract

The utility model belongs to the field of brushless motors, and discloses a brushless motor which comprises an outer shell, an inner shell, a stator, a rotor, a rotating shaft and a fan, wherein the rotating shaft is fixedly connected with the rotor; a circle of air guide plates which are obliquely arranged are arranged between the outer shell and the inner shell; the fan is positioned between the air outlet and the air deflector. Which can effectively suppress noise in the case of high-speed operation.

Description

Brushless motor

Technical Field

The utility model relates to the field of brushless motors, in particular to a brushless motor suitable for various high-speed operation working conditions.

Background

CN201520632410.8 discloses a brushless motor with a built-in heat dissipation fan, which solves the problem that heat dissipation cannot be performed to the maximum extent, and dust is often more in the working environment of the motor, so that a large amount of dust enters the motor while heat dissipation, resulting in low operating power of the motor. Its technical scheme main points are that motor body's both sides are provided with front end housing and rear end housing, and front end housing and rear end housing still have the cladding in the side end cap of motor body lateral wall the inside radiator fan that has of front end housing, radiator fan is rotatory along with the motor shaft, radiator fan includes the base plate, one side of base plate has a plurality of blades, the opposite side of base plate has a plurality of evenly distributed's stiffening rib, front end housing and rear end housing all are provided with a plurality of symmetrical breachs, the length more than or equal to radiator fan holistic thickness of breach in the side end cap. The frequency of air exchange is higher, and heat dispersion is better.

CN202021746394.2 discloses a brushless motor external rotor subassembly, including casing magnetic ring, pivot, magnet steel locating rack and a plurality of magnet steel, the magnetic ring nestification is fixed and is surveyed outside the magnet steel locating rack, the magnet steel locating rack is the injection molding, the magnet steel locating rack is a tubular structure, the magnet steel interval sets up on the inner peripheral surface of magnet steel locating rack, the bottom of magnet steel locating rack is equipped with the end plate, be equipped with the turbofan blade that is radial distribution's involute form on the interior terminal surface of end plate, the end plate is equipped with the louvre all around, the pivot with end plate fixed connection, the pivot with the coaxial setting in magnet steel locating rack center. The brushless motor outer rotor assembly has a good heat dissipation effect; the problem of the end face and radial runout of the rotor can be solved, the dynamic balance problem can be solved by adopting a weighting mode, and the production efficiency can be effectively improved; the magnetic steel positioning frame of the brushless motor outer rotor assembly adopts injection molding parts, only a few metal parts are used, and the whole rotor structure is light in weight, so that the advantage of light weight of a product is enhanced; and the magnetic steel does not need glue for bonding, so the magnetic steel has the characteristics of environmental protection and safety.

The two solutions have a significant problem that noise generated during operation and air exhaust is significant for the brushless motor operating at high speed.

SUMMERY OF THE UTILITY MODEL

The object of the present invention is to provide a brushless motor in which noise can be effectively suppressed in the case of high-speed operation.

The technical scheme provided by the utility model is as follows: a brushless motor comprises an outer shell, an inner shell, a stator, a rotor, a rotating shaft and a fan, wherein the rotating shaft is fixedly connected with the rotor; a circle of air guide plates which are obliquely arranged are arranged between the outer shell and the inner shell; the fan is positioned between the air outlet and the air deflector.

In the above brushless motor, the fan is a squirrel cage fan; the inner cavity of the fan is opposite to the air outlet.

In the brushless motor, the fan comprises a lower bottom plate, an annular upper top plate and a plurality of arc-shaped air inlet plates positioned between the upper top plate and the lower bottom plate; a plurality of arc air inlet plates are arranged in sequence to form a ring.

In the brushless motor, two adjacent air deflectors form an air guide channel, two adjacent arc-shaped air inlet plates form an air inlet channel, and the rotation direction of the fan and the air guide direction of the air guide channel are both clockwise or anticlockwise.

In the above brushless motor, the upper top plate is a ring-shaped arc surface with a thick upper part and a thin lower part; the annular arc is convex towards the inside of the fan.

In the above brushless motor, the lower side of the inner housing is an open side, a stator fixing frame is fixed in the inner housing, and the stator is fixed on the stator fixing frame.

In the above brushless motor, the bearing of the rotating shaft is fixed to the stator fixing frame.

In the brushless motor, the brushless motor further comprises a main control board, and the main control board is fixed on one side of the stator fixing frame, which is far away from the fan.

In the above brushless motor, a height of the lower edge of the inner housing is higher than a height of the bottom surface of the stator.

In the above brushless motor, the air deflector is an arc-shaped plate, and the inner shell and the outer shell are both cylindrical.

After the technical scheme is adopted, the utility model has the beneficial effects that:

this scheme has still increased the aviation baffle except that the fan, changes the flow direction of wind through the aviation baffle, makes its inner wall rotation rising that pastes the shell body, is inhaled in the position of fan and derives the air exit, can reduce certain noise of airing exhaust, plays good radiating effect.

As the optimization of the scheme, the fan is set to be a squirrel-cage structure, and the inclined arrangement of the air guide plates is matched, so that the noise generated by turbulent flow formed by wind at the position of the fan can be avoided, and certain exhaust noise can be reduced.

The structure of the upper top plate can reduce certain exhaust noise by weakening the noise.

Through the improvements, the noise of the scheme can be reduced to below 80 dB, and compared with the commercial product with the noise of 95 dB, the scheme has obvious advantages.

Drawings

Fig. 1 is a perspective view of embodiment 1 of the present invention;

FIG. 2 is a top view of embodiment 1 of the present invention;

FIG. 3 is a sectional view A-A of FIG. 2 of embodiment 1 of the present invention;

fig. 4 is a perspective view of a part of the outer case and the inner case of embodiment 1 of the present invention.

Detailed Description

The technical solution of the present invention will be described in further detail with reference to the following embodiments, but the present invention is not limited thereto.

Example 1:

as shown in fig. 1-4, a brushless motor includes an outer housing 1, an inner housing 2, a stator 3, a rotor 4, a rotating shaft 5 fixedly connected to the rotor 4, and a fan 6, wherein the stator 3 is fixed in the inner housing 2, the outer housing 1 is provided with an air outlet 7, and the fan 6 is fixed on the rotating shaft 5 and corresponds to the air outlet 7; a circle of air deflectors 8 which are obliquely arranged are arranged between the outer shell 1 and the inner shell 2; the fan 6 is positioned between the air outlet 7 and the air deflector 8.

Generally, if the fan 6 is a blade type fan, whether the fan 6 extends to the upper side of the air deflector 8 can play a role of noise reduction, and if the fan 6 is a squirrel cage type fan, because the lower side of the fan 6 is closed, the edge of the squirrel cage type fan 6 should not completely cover the air deflector 8, preferably is adjacent to the air deflector 8, and more preferably is coincident with the edge of the air deflector 8.

After the power is switched on, the stator 3 and the rotor 4 are matched, the rotor 4 starts to rotate, in the process, heat is generated and is discharged along with the air flow, the flowing direction of the air flow is between the inner shell 2, the inner shell 2 and the outer shell 1, the position of the fan 6 and the air outlet 7, the generated noise comes from the air discharged by the fan 6 and an air unfixed flowing channel in the inner shell 2, so that the noise is formed at the edge of the blade of the fan 6, and the noise can be reduced by arranging the air deflector 8 and guiding the air to the edge of the blade of the fan 6 according to one direction.

Preferably, the air deflector 8 is an arc-shaped plate, and the inner shell 2 and the outer shell 1 are both cylindrical.

In the present embodiment, the fan 6 is preferably a squirrel cage fan; the inner cavity of the fan 6 is opposite to the air outlet 7.

Compared with the paddle fan 6, the air flow is more stable, and the noise generated by the fan can be extremely low under the condition that the air deflector 8 exists, generally the noise can reach below 85 decibels, although the decibel quantity and the size of the motor are related, and the fan is generally compared with a commercially available brushless motor with 95 decibels of noise in the same size specification.

In this embodiment, the fan 6 includes a lower bottom plate 61, an annular upper top plate 62, and a plurality of arc-shaped air inlet plates 63 located between the upper top plate 62 and the lower bottom plate 61; the arc-shaped air inlet plates 63 are sequentially arranged to form an annular shape, two adjacent air guide plates 8 form an air guide channel, two adjacent arc-shaped air inlet plates 63 form an air inlet channel, and the rotation direction of the fan 6 and the air guide direction of the air guide channel are both clockwise or anticlockwise.

It can be understood that when the wind guide channel discharges wind clockwise, the risk of clockwise rotation guides the wind into the inner cavity of the fan 6, and the wind does not impact the air, so that the smooth flowing of the air can be ensured, and the noise is reduced.

Preferably, the upper top plate 62 is thick at the top and thin at the bottom, and the inner wall is an annular arc surface; said circular arc is convex towards the inside of the fan 6. This also serves to reduce noise.

By the above-mentioned preference, the noise can be controlled to about 80 db or less optimally.

Preferably, the downside of interior casing 2 is open side, interior casing 2 internal fixation has stator mount 9, stator 3 is fixed on stator mount 9, the bearing of pivot 5 is fixed on stator mount 9, still includes main control board 10, main control board 10 is fixed in the one side that fan 6 was kept away from to stator mount 9, the height that highly is higher than the bottom surface of stator 3 on the lower edge of interior casing 2.

The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims

1. A brushless motor comprises an outer shell, an inner shell, a stator, a rotor, a rotating shaft and a fan, wherein the rotating shaft is fixedly connected with the rotor; the air guide plate is characterized in that a circle of air guide plates which are obliquely arranged are arranged between the outer shell and the inner shell; the fan is positioned between the air outlet and the air deflector.

2. The brushless electric machine of claim 1, wherein the fan is a squirrel cage fan; the inner cavity of the fan is opposite to the air outlet.

3. The brushless electric machine of claim 2, wherein the fan comprises a lower base plate, an annular upper top plate, a plurality of arc-shaped air inlet plates between the upper top plate and the lower base plate; a plurality of arc air inlet plates are arranged in sequence to form a ring.

4. The brushless electric machine of claim 3, wherein two adjacent air deflectors form an air guiding channel, two adjacent arc-shaped air inlet plates form an air inlet channel, and the rotation direction of the fan and the air guiding direction of the air guiding channel are both clockwise or counterclockwise.

5. The brushless electric machine of claim 3, wherein the top plate has a thick top and a thin bottom, and the inner wall has an annular arc surface; the annular arc is convex towards the inside of the fan.

6. The brushless motor according to any one of claims 1 to 5, wherein a lower side of the inner housing is an open side, and a stator holder is fixed to the inner housing, and the stator is fixed to the stator holder.

7. The brushless electric machine of claim 6, wherein the bearing of the rotating shaft is fixed to a stator fixing frame.

8. The brushless electric machine of claim 6, further comprising a main control board fixed to a side of the stator holder away from the fan.

9. The brushless motor of claim 6, wherein a height of a lower edge of the inner housing is higher than a height of a bottom surface of the stator.

10. The brushless electric machine according to any of claims 1-5, wherein the air deflector is an arc-shaped plate, and the inner housing and the outer housing are both cylindrical.