CN202696436U

CN202696436U - Slender shaft outer rotor direct-current brushless motor structure

Info

Publication number: CN202696436U
Application number: CN 201220323624
Authority: CN
Inventors: 高林发
Original assignee: HUZHOU JUHONG MOTORS CO Ltd
Current assignee: HUZHOU JUHONG MOTORS CO Ltd
Priority date: 2012-07-06
Filing date: 2012-07-06
Publication date: 2013-01-23
Anticipated expiration: 2022-07-06

Abstract

The utility model relates to a slender shaft outer rotor direct-current brushless motor structure which comprises a rotor, a stator, a stator base, a bearing and an outer rotor shade, wherein the rotor comprises a motor shell, a permanent magnet and a rotating shaft; the rotating shaft extends outside the periphery of the motor so as to form a torque output end; the stator comprises a stator overlapping sheet, a stator coil and a driving circuit; a middle pipe is arranged at the middle of the stator base; the stator is fixed on the middle pipe; the outer rotator shade is fixed with the stator base; the rotor is connected with the bearing through the rotating shaft; and the bearing is fixed on the middle pipe and the outer rotor shade. According to the slender shaft outer rotor direct-current brushless motor structure, a clamping groove free design is adopted between a motor torque output shaft and a bearing support, the stress deformation of the shaft is overcome, the strength of the torque output shaft is enhanced, the condition that a load ca perform concentric operation along with the torque output end is ensured, the problem of the motor balance vibration when the load operates is reduced, and the difficult problem that the slender shaft motor operates unstably is solved.

Description

A kind of slender axles external rotor Structure of D. C. brushless motor

Technical field

The utility model relates to a kind of motor, is specifically related to a kind of slender axles external rotor Structure of D. C. brushless motor, and it can be widely used in juice extractor, mixer, milk making machine, dust catcher etc. needs in the system applies of longer motor output shaft.

Background technology

In the external rotor DC Brushless Motor, simple in structure because of it, processing procedure is succinct, and high production capacity is low-cost and applied rapidly.But existing external rotor DC Brushless Motor causes when the longer motor output shaft of needs because of its peculiar structural design, its load running is difficult to keep balance and stability, be in the situation of slender axles at the torque output particularly, or during the ultrahigh speed load running, the imbalance of motor Chang Yin system and produce strong vibration can't satisfy the job requirement of system.

The slender axles external rotor Structure of D. C. brushless motor of prior art is formed by a few part assemblings such as rotor 1 ', rotating shaft 2 ', stator 3 ', stator seat 4 ' and bearing 5 ' usually, and rotating shaft 2 ' is torque output 21 ' in the peripheral extension that joins with system load of motor.

See also shown in the Figure of description 1, when torque output 21 ' stretches out from stator seat 4 ' one side, must offer a draw-in groove (not label) between this torque output 21 ' and the rotating shaft support end, must carry out axial location to rotor by assembling buckle 7 ' in this draw-in groove.Yet, under present technology condition, when in the middle of the slender axles fluting being arranged, its remitted its fury, the stress deformation that notch produces after the heat treatment more can't guarantee the linearity of axle, thereby causes this torque output 21 ' to produce larger beat when motor operation.Simultaneously, operation produced serious imbalance after load was written into the beat axle head, and the motor high vibration has a strong impact on system quality, can't satisfy system requirements.

See also shown in the Figure of description 2, when torque output 21 ' is stretched out from rotor 1 ' one side, in the middle of torque output 21 ' and rotating shaft support end, need not to offer draw-in groove, during the 21 ' the empty load running of torque output without beat, yet, belong to book wall suspended structure owing to manage 41 ' in the stator seat, this structural rigidity is not enough, bearing 5 ' effective support distances is short, and load is from strong point distance, so the imbalance of load itself is amplified to the bearings end, especially when load is the stirring object that may change at any time, middle pipe 41 ' produces vibration and beat, and this beat is amplified to load end through slender axles, dislikes the shape circulation thereby form.Motor affects craftmanship because of vibration and beat, when serious in pipe cracking or rotating shaft distortion, can't satisfy system requirements.

Therefore, use the internal rotor DC Brushless Motor that structure and making technology are complicated, production capacity is low, cost is expensive, be unfavorable for the propagation and employment of product.

In order to address the above problem, necessaryly provide a kind of structure improved slender axles external rotor Structure of D. C. brushless motor that has, to overcome described defective of the prior art.

The utility model content

For addressing the above problem, the purpose of this utility model is to provide a kind of slender axles external rotor Structure of D. C. brushless motor, and it can guarantee the linearity of torque output, can export torque without beat again.

For achieving the above object, the technical scheme that the utility model is taked is: a kind of slender axles external rotor Structure of D. C. brushless motor, and it comprises rotor, stator, stator seat, bearing and rotor outer cover; Wherein, described rotor comprises motor shell, permanent magnet and rotating shaft, and the peripheral torque output that forms of motor is extended in this rotating shaft; Described stator comprises stator lasmination, stator line bag and drive circuit; Be provided with middle pipe in the middle of the described stator seat, described stator is fixed in this on pipe; Described rotor outer cover and stator seat are fixed; Described rotor is connected with bearing by rotating shaft, and described bearing is fixed on middle pipe and the rotor outer cover.

Slender axles external rotor Structure of D. C. brushless motor of the present utility model further is set to: form a host cavity between described rotor outer cover and the stator seat, described rotor is contained in this host cavity.

Slender axles external rotor Structure of D. C. brushless motor of the present utility model further is set to: described rotating shaft is arrived at the bearings place and is the smooth structure without draw-in groove between the torque output.

Slender axles external rotor Structure of D. C. brushless motor of the present utility model further is set to: described torque output stretches out from the bottom of stator seat.

Slender axles external rotor Structure of D. C. brushless motor of the present utility model also is set to: described torque output stretches out from the top of rotor outer cover.

Compared with prior art, the utlity model has following beneficial effect:

Slender axles external rotor Structure of D. C. brushless motor of the present utility model adopts between motor torque output and motor without the draw-in groove design, overcomes the stress deformation of axle, increases the intensity of torque output, and proof load is with the concentric running of torque output; Motor balance vibration problem when reducing load running has solved the difficult problem of slender axles motor operation shakiness.Simultaneously, if under prior art, do not have draw-in groove and snap ring, just can't be to rotor at bearing to positioning, and after the rotor outer cover has been arranged, because rotor outer cover and rotor are fixed, can carry out bearing to the location to rotor by part gap or spring.

Description of drawings

Fig. 1 is the schematic diagram of the external rotor external rotor DC Brushless Motor of prior art.

Fig. 2 is the schematic diagram of the external rotor external rotor DC Brushless Motor of another prior art.

Fig. 3 is the schematic diagram of slender axles external rotor Structure of D. C. brushless motor of the present utility model.

Fig. 4 is the schematic diagram of another execution mode of slender axles external rotor Structure of D. C. brushless motor of the present utility model.

Embodiment

See also shown in the Figure of description 3, it is the first execution mode of a kind of slender axles external rotor Structure of D. C. brushless motor of the present utility model, and it is formed by a few part assemblings such as rotor 1, stator 3, stator seat 4, bearing 5 and rotor outer cover 6.

Wherein, described rotor 1 comprises motor shell 11, permanent magnet 12 and rotating shaft 2, and the peripheral torque output 21 that forms of motor is extended in this rotating shaft 2, and this torque output 21 joins with system load.Described rotating shaft 2 in bearing 5 supports place between the torque output 21 being smooth structure without draw-in groove.

Described stator 3 is comprised of parts such as stator lasmination 31, stator line bag 32 and drive circuits 33.Described stator seat 4 comprises manages 41 in one, described stator 3 is fixed in this and manages on 41.Described rotor outer cover 6 is fixed with stator seat 4 and is formed a host cavity 8, and described rotor 1 is contained in this host cavity 8, thereby changes external rotor external rotor DC Brushless Motor into internal rotor external rotor DC Brushless Motor, has satisfied widely motor instructions for use.

Described rotor 1 is connected with bearing 5 by rotating shaft 2, and described bearing 5 is separately fixed on middle pipe 41 and the rotor outer cover 6, i.e. rotating shaft 2 is supported in respectively on middle pipe 41 and the rotor outer cover 6 by bearing 5.By with a bearing 5 outer the moving on in the rotor outer cover 6 in the stator seat 4, lengthened the distance between the bearing 5, prolonged the bearing length of rotating shaft 2, thereby made rotating shaft 2 operations more steady.Further, be arranged with a spring 9 in described rotating shaft 2, an end of this spring 9 is connected on the bearing 5, thereby rotor 1 is carried out bearing to the location.In the present embodiment, described torque output 5 stretches out from the bottom of stator seat 4.

See also shown in the Figure of description 4, it is another execution mode of a kind of slender axles external rotor Structure of D. C. brushless motor of the present utility model, the difference of itself and the first execution mode is that its torque output 21 stretches out from the top of rotor outer cover 6, and other structures are basic identical, so, do not repeat them here.

Above embodiment only is the preferred embodiment of this creation, not in order to limiting this creation, all in this creation spirit and principle within make any modification, be equal to replacement, improvement etc., all should be included within the protection range of this creation.

Claims

1. a slender axles external rotor Structure of D. C. brushless motor is characterized in that: comprise rotor, stator, stator seat, bearing and rotor outer cover; Wherein, described rotor comprises motor shell, permanent magnet and rotating shaft, and the peripheral torque output that forms of motor is extended in this rotating shaft; Described stator comprises stator lasmination, stator line bag and drive circuit; Be provided with middle pipe in the middle of the described stator seat, described stator is fixed in this on pipe; Described rotor outer cover and stator seat are fixed; Described rotor is connected with bearing by rotating shaft, and described bearing is fixed on middle pipe and the rotor outer cover.

2. slender axles external rotor Structure of D. C. brushless motor as claimed in claim 1 is characterized in that: form a host cavity between described rotor outer cover and the stator seat, described rotor is contained in this host cavity.

3. slender axles external rotor Structure of D. C. brushless motor as claimed in claim 2 is characterized in that: described rotating shaft at the bearings place to being the smooth structure without draw-in groove between the torque output.

4. slender axles external rotor Structure of D. C. brushless motor as claimed in claim 3, it is characterized in that: described torque output stretches out from the bottom of stator seat.

5. slender axles external rotor Structure of D. C. brushless motor as claimed in claim 3, it is characterized in that: described torque output stretches out from the top of rotor outer cover.