CN101373907A

CN101373907A - Brushless motor

Info

Publication number: CN101373907A
Application number: CNA2008101260176A
Authority: CN
Inventors: 姜卫亮; 应时立
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-07-01
Filing date: 2008-07-01
Publication date: 2009-02-25

Abstract

The invention discloses a brushless electric motor, which comprises a motor shaft and a casing. The motor shaft passes through the inner part of the casing; a bearing is arranged in a matching position between the motor shaft and the casing; a rotor is arranged on the motor shaft inside the casing; a stator matched with the rotor is arranged on the casing; an internal cooling windhole is opened inside the stator; an air inlet and an air outlet are respectively opened at the two ends of the casing or the air inlet and the air outlet are respectively opened on the front side and the rear side of the casing; at least a cooling fan is arranged on the motor shaft. In the brushless electric motor, the cooling windhole is opened inside the stator and the cooling fan is adopted to rapidly cool the internal environment of the electric motor, thereby meeting the rapid cooling need of the equipment with high-power and small volume and ensuring the normal service of the equipment. The experiment is stopped when the surface temperature of the electric motor reaches more than 120 DEG C after no-load running for 20 minutes without ventilation cooling, and the surface temperature of the electric motor provided with the cooling fan only reaches 50 DEG C after no-load running for 1 hour, thereby increasing the performance of the electric motor greatly.

Description

A kind of brushless electric machine

[technical field]

Patent of the present invention relates to brushless electric machine, relates in particular to high-power output to cool off the low a kind of brushless electric machine of temperature rise fast under small size.

[background technology]

By natural cooling, therefore there are shortcomings such as volume is big, power is little in the cooling device that all do not ventilate in the present brushless electric machine.Brushless electric machine volume and present series excitation (the string utmost point) motor in output with bigger by about 50% under the power situation than series excitation (the string utmost point) motor.

The name that the inventor submits to is called in the patent application of " power source and adopt the hand-held type electric tool of this power source " to be improved the structure of equipment such as electric tool, garden instrument, wood working tool, DC tools, handheld tool, jetting machine, obtained and increased the service life, reduce operation easier, improve advantages such as control precision.In experimentation repeatedly, the applicant finds, because these equipment requirements power large volumes are little, and therefore brushless electric machine wherein, often influences normal use at present just by natural cooling because of motor overheating.

[summary of the invention]

The object of the invention solves the problems of the prior art exactly, proposes a kind of brushless electric machine, and quick cooling requirement that can high-power small device guarantees the normal use of equipment.

For achieving the above object, patent of the present invention has proposed a kind of brushless electric machine, comprise motor shaft and casing, described motor shaft passes the inside of casing, be provided with bearing with the casing cooperation place, on the motor shaft rotor is installed in the casing, the stator that cooperates with rotor is installed on the casing, the inside of described stator has interior cooling air channel, the casing two ends have air inlet and air outlet or have air inlet and air outlet in the front and back of casing two sides, and at least one cooling fan is installed on the described motor shaft.

As preferably, described cooling fan is installed in the place ahead of casing internal stator.

As preferably, described cooling fan is installed in the outside rear of casing.

As preferably, the quantity of described cooling fan is two, a place ahead that is installed in the casing internal stator, and another is installed in the outside rear of casing.

As preferably, described cooling fan is arranged on the motor shaft.

Beneficial effect of the present invention: the present invention has cooling air channel in stator interior, and adopts cooling fan that the motor internal environment is cooled off fast.Utilize cooling fan to casing or to the cooling of ventilating of stator periphery.Satisfy the quick cooling requirement of high-power small device, guaranteed the normal use of equipment.It is original 1/3 to adopt brushless electric machine volume behind this patent to narrow down to, and also littler by 1/3 than the series excited machine volume with power output, no-load consumption power has only 1/5 of series excited machine.20 minutes motor surface temperatures of no-load running stop test with regard to reaching more than 120 ℃ under the cooling situation of not ventilating, and 1 hour motor surface temperature of empty load of motor operation that cooling fan is housed also has only 50 ℃.Improved motor performance greatly.

The feature of patent of the present invention and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.

[description of drawings]

Fig. 1 is the structural representation of a kind of brushless electric machine embodiment one of patent of the present invention;

Fig. 2 is the left view of Fig. 1;

Fig. 3 is the right view of Fig. 1;

Fig. 4 is the A-A cutaway view of Fig. 1;

Fig. 5 is the structural representation of a kind of brushless electric machine embodiment two of patent of the present invention;

Fig. 6 is the left view of Fig. 5;

Fig. 7 is the right view of Fig. 5;

Fig. 8 is the B-B cutaway view of Fig. 5.

[embodiment]

Embodiment one:

Shown in Fig. 1,2,3,4, a kind of brushless electric machine, comprise motor shaft 1 and casing 3, described motor shaft 1 passes the inside of casing 3, be provided with bearing 6 with casing 3 cooperation places, on the motor shaft 1 rotor 5 is installed in the casing 3, the stator 4 that cooperates with rotor 5 is installed on the casing 3, the inside of described stator 4 has interior cooling air channel 7, casing 3 two ends have air inlet 8 and air outlet 9 or have air inlet and air outlet in the front and back of casing 3 two sides, on the motor shafts 1 at least one cooling fan 2 are installed in the described casing 3.Be provided with fan spindle bearing 10 between described cooling fan 2 and the motor shaft 1.

Adopt a cooling fan 2 in the present embodiment, be installed in the place ahead of casing 3 internal stators 4.Cooling fan after also can only using one is installed in the outside rear of casing 3.In the use, under the rotation of cooling fan 2, extraneous air constantly enters in the casing 3 by air inlet 8, pass casing 3 inside by the interior cooling air channel 7 in the stator 4, and blow out from air outlet 9, so will constantly take the heat of motor internal repeatedly out of, reach better heat radiating effect.

Embodiment two:

Shown in Fig. 5,6,7,8, adopted 2, one the place aheads that are installed in casing 3 internal stators 4 of two cooling fans in the present embodiment, another is installed in the outside rear of casing 3.Cooling air channel 7 was done the air channel in cooling fan 2 in the casing 3 utilized, and casing 3 outer cooling fans 2 utilize the space outerpace of casing 3 to do the air channel.Compare with embodiment one, present embodiment is simultaneously inside and outside aeration structure, has further improved the ventilation cooling effect, but has also increased cost simultaneously.

In the use, under the rotation of two cooling fans 2, extraneous air constantly passes through simultaneously from the inboard and the outside of casing 3, constantly takes the heat of motor internal out of, reaches better heat radiating effect.

Patent of the present invention is applicable to all kinds of direct currents, interchange 1.5V-500V brushless electric machine.

The foregoing description is the explanation to patent of the present invention, is not the qualification to patent of the present invention, any invention patent protection scope that scheme after the patent type simple transformation of the present invention is all belonged to this.

Claims

1. brushless electric machine, comprise motor shaft (1) and casing (3), described motor shaft (1) passes the inside of casing (3), be provided with bearing (6) with casing (3) cooperation place, rotor (5) is installed on the interior motor shaft of casing (3) (1), the stator (4) that cooperates with rotor (5) is installed on the casing (3), it is characterized in that: the inside of described stator (4) has interior cooling air channel (7), casing (3) two ends have air inlet (8) and air outlet (9) or have air inlet (8) and air outlet (9) in the front and back of casing (3) two sides, and at least one cooling fan (2) is installed on the described motor shaft (1).

2. a kind of brushless electric machine as claimed in claim 1 is characterized in that: described cooling fan (2) is installed in the place ahead of casing (3) internal stator (4).

3. a kind of brushless electric machine as claimed in claim 1 is characterized in that: described cooling fan (2) is installed in the outside rear of casing (3).

4. a kind of brushless electric machine as claimed in claim 1 is characterized in that: the quantity of described cooling fan (2) is two, a place ahead that is installed in casing (3) internal stator (4), and another is installed in the outside rear of casing (3).

5. as any one described a kind of brushless electric machine in the claim 1 to 4, it is characterized in that: be provided with fan spindle bearing (10) between described cooling fan (2) and the motor shaft (1).