CN201781343U

CN201781343U - Brushless motor and fan using same

Info

Publication number: CN201781343U
Application number: CN201020502993XU
Authority: CN
Inventors: 姜茂雄; 李越; 张涛; 肖三元; 陈力侃
Original assignee: Johnson Electric Shenzhen Co Ltd
Current assignee: Johnson Electric Shenzhen Co Ltd
Priority date: 2010-08-20
Filing date: 2010-08-20
Publication date: 2011-03-30
Anticipated expiration: 2020-08-20

Abstract

The utility model relates to a brushless motor and a fan using the same. The brushless motor comprises a rotating shaft and an annular integral magnet arranged at the rotating shaft, wherein, the annular magnet comprises a plurality of magnetic poles which are alternately arranged along the peripheral direction; each magnetic pole is radially polarized; and the boundary between the adjacent magnetic poles inclines relative to an axis of the rotating shaft. In the utility model, a rotor magnet is designed in a slanting magnetizing mode so as to eliminate part of the harmonic content of cogging torque and reduce vibration and noise.

Description

Brushless electric machine and use the fan of described brushless electric machine

Technical field

The utility model relates to a kind of brushless electric machine and uses the fan of described brushless electric machine.

Background technology

Existing brushless electric machine is in conjunction with the production technology of reality, the notch of motor actual design is big, air gap is little, thereby cause existing bigger slot effect, the teeth groove moment that slot effect produces is unfavorable for that motor rotates, easily cause motor to produce bigger vibration and noise, and be applied in easily generation resonance in the actual product, increase the vibration and the noise of whole system.

Thereby the utility model aims to provide a kind of by reducing the novel brushless electric machine that slot effect reduces vibration reduction noise.

The utility model content

The utility model provides a kind of brushless electric machine, comprise rotating shaft, be mounted to the annular integral type magnet of rotating shaft, described annular magnet comprises the some magnetic poles that along the circumferential direction are arranged alternately, and each magnetic pole radially polarizes, and the borderline phase countershaft axis between adjacent pole tilts.

Preferably, described rotor also comprises the rotor core that is fixed to rotating shaft, and described annular magnet is placed on the rotor core.

Preferably, the angular range of the inclination of the borderline phase countershaft axis between adjacent pole is 15～30 degree.

Preferably, described motor is 4 utmost points, 6 groove motors.

Preferably, described rotor also comprises the balance weight that is fixed to rotor core two axial ends.

The utility model also provides a kind of fan, comprise pedestal and the nozzle ring that is installed on the pedestal top, described nozzle comprises that an inner passage communicates with the base interior space, described pedestal is established air vent hole, one brushless electric machine is positioned at described pedestal, described brushless electric machine comprises rotating shaft, be mounted to the annular integral type magnet of rotating shaft and be installed on the impeller of rotating shaft end, described annular magnet comprises the some magnetic poles that along the circumferential direction are arranged alternately, each magnetic pole radially polarizes, and the borderline phase countershaft axis between adjacent pole tilts.

Preferably, described nozzle comprises an exhaust outlet, and the end of described exhaust outlet is established the coanda surface.

The utility model illustrated embodiment has following beneficial effect: rotor magnet adopts oblique utmost point design, thereby can eliminate part alveolar torque harmonic content, thereby reduces vibration and reduce noise.

In order further to understand feature of the present utility model and technology contents, see also following about detailed description of the present utility model and accompanying drawing, yet institute's accompanying drawing only provide with reference to and the explanation usefulness, be not to be used for the utility model is limited.

Description of drawings

In the accompanying drawing:

Fig. 1 is the schematic cross-section of the brushless electric machine of the utility model one embodiment;

Fig. 2 is the rotating shaft and the annular magnet schematic diagram of brushless electric machine shown in Figure 1;

Fig. 3 is that the magnetic pole of the annular magnet of brushless electric machine shown in Figure 1 launches schematic diagram;

Figure 4 shows that the fan cross-sectional schematic of using the brushless electric machine shown in the foregoing description;

Figure 5 shows that the enlarged diagram of a part of the nozzle of fan shown in Figure 4.

Embodiment

Below in conjunction with accompanying drawing,, will make the technical solution of the utility model and other beneficial effects apparent by embodiment of the present utility model is described in detail.

Referring to figs. 1 to Fig. 3, brushless electric machine 10 of the present utility model comprises stator 30 and the rotor 50 that is installed in the stator 30.

Described stator 30 comprises housing 32, is installed in the stator core 34 of housing 32 inner surfaces, is wound in the winding 36 on the iron core 34.Described iron core 34 comprises some teeth that radially extend internally 342, forms winding slot 344 between the adjacent teeth, and described winding 36 is around on the tooth 342 and is contained in the winding slot 344.Preferably, described iron core 34 forms 6 winding slots 344.The end of the tooth 342 of described iron core 34 surrounds a host cavity jointly.

Described rotor 50 comprises rotating shaft 52, be fixed to rotor core 54 in the rotating shaft 52, be placed on annular integral type magnet 56 on the rotor core 54, be fixed to the balance weight 58 (center that balance weight 58 is used to regulate rotor core 54 overlaps with the rotating shaft center) of 54 liang of axial ends of rotor core.Described iron core 54 and magnet 56 are positioned at the host cavity that the end of the tooth 342 of stator core 34 surrounds jointly, the tooth 342 of described magnet 56 and stator core 34 terminal relative.Described annular magnet 56 comprises the some magnetic poles 562 that along the circumferential direction are arranged alternately, and each magnetic pole 562 radially polarizes, the 564 relative shaft axis tilt alpha angles, border that adjacent pole is 562.Preferably, described annular magnet 56 is polarized into 4 magnetic poles.

Brushless electric machine 10 of the present utility model, rotor magnet 56 adopt oblique utmost point design, thereby can eliminate part alveolar torque harmonic content, thereby reduce vibration and reduce noise.The border 564 relative shaft axis Z-Z tilt angle alpha that adjacent pole is 562 are big more, can effectively eliminate the alveolar torque harmonic content more, yet, angle is crossed senior general influences efficiency of motor, preferably, the angle [alpha] scope that tilts of the border 564 relative shaft axis Z-Z of 562 of described adjacent poles is 15～30 degree.

Figure 4 shows that the fan cross-sectional schematic of using the brushless electric machine shown in the foregoing description.

See also Fig. 4 and Fig. 5, in the present embodiment, described fan 70 is no flabellum fan, comprises pedestal 80 and the annular nozzle 90 that is installed on the pedestal 80.Described annular nozzle 90 central authorities establish opening 92, and inner passage 94 communicates with pedestal 80 inner spaces, and described nozzle 90 also is provided with an exhaust outlet 96 that is used to receive from the inner passage air-flow, and the end of described exhaust outlet 96 is established coanda surface 98.Described motor 10 is installed in the pedestal 80, motor 10 rotating shaft ends are equipped with impeller 58, pedestal 80 shells are established air vent hole 82, during motor 10 work, impeller 58 high speed rotating, the outer air of base shell 80 is drawn in the pedestal 80 via air vent hole 82, enters the inner passage 94 of annular nozzle 90 afterwards, discharges via the exhaust outlet 96 of annular nozzle 90 at last.Air-flow is compressed when entering exhaust outlet 96, and is further compressed at outlet 97 places of exhaust outlet 96.By exporting 97 air-flows of discharging is primary air.Primary air is directed flowing through coanda surface 98, and is exaggerated by Coanda effect.By primary air entrainment from external environment condition, especially produce secondary streams near the air the outward flange of outlet 97 peripheral regions and nozzle.The part of secondary streams can also be directed and by diffuser surface 99.Secondary streams passes opening 92, thereby combines the generation total air flow of ejection forward with primary air at opening 92 places.

The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.

Claims

1. brushless electric machine, comprise rotating shaft, be mounted to the annular integral type magnet of rotating shaft, described annular magnet comprises the some magnetic poles that along the circumferential direction are arranged alternately, and each magnetic pole radially polarizes, it is characterized in that the borderline phase countershaft axis between adjacent pole tilts.

2. brushless electric machine as claimed in claim 1 is characterized in that described rotor also comprises the rotor core that is fixed to rotating shaft, and described annular magnet is placed on the rotor core.

3. brushless electric machine as claimed in claim 1 or 2 is characterized in that, the angular range that the borderline phase countershaft axis between adjacent pole tilts is 15～30 degree.

4. brushless electric machine as claimed in claim 1 is characterized in that, described motor is 4 utmost points, 6 groove motors.

5. brushless electric machine as claimed in claim 3 is characterized in that described rotor also comprises the balance weight that is fixed to rotor core two axial ends.

6. a fan is characterized in that, described fan adopts as each described brushless electric machine of claim 1 to 5.

7. fan as claimed in claim 6, it is characterized in that, described fan comprises pedestal and is installed on the nozzle ring of pedestal top, described nozzle comprises an inner passage that communicates with the base interior space, described brushless electric machine is positioned at pedestal, one impeller is installed in the rotating shaft, and described pedestal is established air vent hole so that impeller can the air that pedestal is outer is evacuated in the pedestal via air vent hole and deliver to the inner passage of described nozzle.

8. fan as claimed in claim 7 is characterized in that described nozzle comprises an exhaust outlet, and the end of described exhaust outlet is established the coanda surface.