CN203504313U

CN203504313U - Stator punching sheet and stator

Info

Publication number: CN203504313U
Application number: CN201320571949.8U
Authority: CN
Inventors: 张小军; 史少辉
Original assignee: Hefei Kaibang Motor Co Ltd
Current assignee: Hefei Kaibang Motor Co Ltd
Priority date: 2013-09-13
Filing date: 2013-09-13
Publication date: 2014-03-26
Anticipated expiration: 2023-09-13

Abstract

The utility model relates to the technical field of brushless direct current motors, especially to a stator punching sheet and a stator. The stator punching sheet includes a circular yoke part, wherein punching sheet teeth are disposed at the yoke part in a stretching manner toward internal side of the yoke part along the radial direction of the circular yoke part, the punching sheet teeth are distributed uniformly along the circumferential direction of the yoke part, a punching sheet slot is formed between each two adjacent punching sheet teeth, and teeth widths of any two adjacent punching sheet teeth are different. The utility model also relates to the stator made of the stator punching sheet. The stator includes a stator metal core, a skeleton, and a coil, wherein the stator metal core is formed by lamination of the stator punching sheets, the skeleton is disposed outside the stator metal core, the coil are winded on the teeth of the stator metal core, and lengths of enamelled wires on the teeth are the same. The stator metal core which is formed by lamination of stator punching sheets, is not in a symmetrical distribution through changing teeth widths of the punching sheet teeth, so that starting torque dead point is eliminated, gullet torque is reduced in a certain degree, and noise is reduced.

Description

Stator punching and stator

Technical field

The utility model relates to brshless DC motor technical field, particularly a kind of stator punching and stator.

Background technology

Brshless DC motor with speed-regulating range width, strong, the middle low speed torque excellent performance of overload capacity, efficiency is high, the life-span is long etc., and advantage has started to be widely used on various household electrical appliance, high technology equipment.The brshless DC motor of at present idle call is modal is all three-phase six states, and stator core is 12 grooves or 18 grooves, and rotor is that injecting ferrite or ferrite magnetic shoe are made, and Fig. 1 is the stator laminating structure schematic diagram that forms stator core, and stator punching tooth is wide.This motor exists following not enough:

1, noise is large.Because rotor is that permanent magnet forms, under the cold state of motor, permanent magnet produces cogging torque with the stator core interaction that has groove and makes rotor have a kind of trend of aliging with stator along a certain specific direction, when rotor structure size, one timing of stator core teeth groove physical dimension, the size of cogging torque just changes along with the difference of rotor position in stator core.Like this, when motor is normally worked, it is no longer a definite value that the instantaneous output torque of motor is subject to the impact of cogging torque, but fluctuates round some values, i.e. torque ripple.Be exactly the direct result motor that torque ripple brings produces vibration and noise, when particularly this motor configures three vane axial-flow loads, can give prominence to and produce 45*n(n=2,3,4,5,6,7,8) noise of Hz, total its peak value even reaches the decibel of complete machine.

2, there is detent torque dead point.Take brshless DC motor of the prior art as example, when electrical power starts, two-phase in its three-phase coil adds voltage simultaneously, rotor is just in time in both sides electromagnetic torque and equates (to be in fact impossible definitely relatively, just difference is too small, to such an extent as to be not enough to drive rotor to rotate) position time, just cannot start.When controlling motor with little current work, because power is poor less, so detent torque dead point is wider.And the too small main therefore structure of stator punching of electromagnetic torque difference is symmetrical, its facewidth all equates.

Utility model content

Primary and foremost purpose of the present utility model is to provide a kind of stator punching, and the permanent-magnet brushless DC electric machine noise that consists of it is little, torque pulsation is little, reliable operation.

For realizing above object, the technical solution adopted in the utility model is: a kind of stator punching, comprise circular yoke portion, described yoke portion extends inwardly punching tooth is set along annulus radial direction, punching tooth is arranged along the circumferentially even interval of annulus, between two adjacent punching teeth, form punching groove, the facewidth of described any two adjacent punching teeth is different.

Compared with prior art, there is following technique effect in the utility model: by changing the facewidth of punching tooth, the stator core that stator punching is overrided to form is no longer arranged symmetrically with, has eliminated detent torque dead point, also can reduce certain cogging torque simultaneously, reduce noise.

Another object of the present utility model is to provide a kind of stator, and noise is little, reliable operation.

For realizing above object, the technical solution adopted in the utility model is: a kind of stator that adopts described stator punching to make, comprise stator core, skeleton and coil, described stator core is overrided to form by stator punching, stator core is outside equipped with skeleton, and the enamelled wire that is wound with coil on coil and each tooth on the tooth of stator core is equal in length.

Compared with prior art, there is following technique effect in the utility model: by changing the facewidth, the stator core that stator punching is overrided to form is no longer arranged symmetrically with, has eliminated detent torque dead point, reduce certain cogging torque, reduce noise; Meanwhile, on each tooth, the equal assurance of winding length motor is normally worked.

Accompanying drawing explanation

Fig. 1 is the stator laminating structure schematic diagram of prior art;

Fig. 2 is stator laminating structure schematic diagram of the present utility model, and for ease of observing, in figure, the size of large, medium and small tooth differs larger;

Fig. 3 is the utility model and the contrast of the prior art facewidth, and dotted portion is the facewidth of the prior art, and solid line is the facewidth of the present utility model;

Fig. 4 is the three-dimensional structure diagram of the utility model upper skeleton;

Fig. 5 is the three-dimensional structure diagram of the utility model lower skeleton;

Fig. 6 is another visual angle three-dimensional structure diagram of Fig. 4;

Fig. 7 is the motor noise spectrum measurement figure that the stator of prior art is made;

Fig. 8 is the motor noise spectrum measurement figure that stator of the present utility model is made.

Embodiment

Below in conjunction with Fig. 2 to Fig. 8, the utility model is described in further detail.

Consult Fig. 2, a kind of stator punching, comprise circular yoke portion 11, described yoke portion 11 extends inwardly punching tooth 12 is set along annulus radial direction, punching tooth 12 is arranged along the circumferentially even interval of annulus, between two adjacent punching teeth 12, form punching groove 13, the facewidth of described any two adjacent punching teeth 12 is different.Here, the facewidth of two adjacent punching teeth 12 is arbitrarily arranged to unequal, exactly in order to break original symmetric design, is changed motor cogging torque, it should be noted that the size of the facewidth of each punching tooth 12 is different here, just less difference.

As preferred version of the present utility model, select the facewidth of large, medium and small three kinds of sizes here.The multiple that the number of described punching groove 13 is three, is convenient to arrange large, medium and small tooth, and as its punching groove 13 of a little bit smaller motor has 12 or 18, its punching groove 13 of larger motor has 36 or more.The large, medium and small tooth of convenient layout, equates the sum of large, medium and small tooth.Described punching tooth 12 comprises canine tooth 121, middle tooth 122 and little tooth 123, and large, medium and small tooth 121,122,123 circumferentially repeats to arrange along annulus successively, presses clockwise or counter clockwise direction, large-in-little-large-in-the little layout that repeats like this.

Consult Fig. 3, the facewidth D2 of described middle tooth 122 equals half of canine tooth 121 facewidth D1 and little tooth 123 facewidth D3 sums, and the facewidth of large, medium and small tooth 121,122,123 is arithmetic progression layout, and mathematic(al) representation is D2=(D1+D3)/2.For the ease of coiling and coil, be unlikely to landing from the tooth of stator core, the end that suspends of large, medium and small tooth 121,122,123 is T-shaped, here it should be noted that, the facewidth of large, medium and small tooth 121,122,123 is different, only refer to tooth body part, its profile that suspends end matches.For ease of understanding, putting together with stator punching of the present utility model prior art in Fig. 3, for comparing, in figure, middle tooth 122 facewidth of the present utility model are the facewidth of the prior art, large and small tooth 121,123 facewidth are greater than respectively, are less than the facewidth of the prior art, from figure, also can find out, only the facewidth is partly changed, and the end that suspends of each tooth is still symmetrical arranged.The periphery of described yoke portion 11 is provided with a locating notch 14, when being convenient to stator punching 10 and laminating into stator core and during stator winding, locates.

A kind of stator that adopts said stator punching to make, comprise stator core, skeleton 20 and coil, described stator core is overrided to form by stator punching 10, stator core is outside equipped with skeleton 20, the effect of skeleton 20 is to prevent that enamelled wire from directly contacting with stator core, prevents that the insulating barrier of enamelled wire is impaired.The enamelled wire that is wound with coil on coil and each tooth on the tooth of stator core is equal in length, and assurance motor is normally worked.

As preferred version of the present utility model, here the stator punching that forms described stator core is preferably as follows scheme: the multiple that the number of described punching groove 13 is three, described punching tooth 12 comprises canine tooth 121, middle tooth 122 and little tooth 123, and large, medium and small tooth 121,122,123 circumferentially repeats to arrange along annulus successively.The facewidth D2 of described middle tooth 122 equals half of canine tooth 121 facewidth D1 and little tooth 123 facewidth D3 sums, and the end profile that suspends of large, medium and small tooth (121,122,123) matches and is T-shaped; The periphery of described yoke portion 11 is provided with a locating notch 14.

Consult Fig. 4 to Fig. 6, equipment for the ease of skeleton 20, described skeleton 20 consists of upper and

lower skeleton

20a, 20b, described upper and lower skeleton 20a, the skeleton body 21 that 20b includes to match with described yoke portion 11, here said matching is that both interior profile is consistent, and the excircle of yoke portion 11 can be more than or equal to the excircle of skeleton body 21.Skeleton body 21 extends inwardly a plurality of skeleton teeth 22 is set along itself radial direction, and skeleton tooth 22 matches with quantity, the position of described punching tooth 12, and the facewidth of described skeleton tooth 22 all matches with described canine tooth 121 width; 22, adjacent skeleton tooth forms skeleton grooves 23.Here dexterously the facewidth of skeleton tooth 22 is arranged to widely, is played the effect of parcel stator core protective paint envelope curve, can make again the enamelled wire length that is wound on each skeleton tooth 22 consistent.

Upper and

lower skeleton

20a, 20b form by following scheme arrangement the parcel of stator core: postpone the parcel forming stator iron core tooth is set to lower skeleton 20b mono-side in the edge of the skeleton grooves of described upper skeleton 20a, and its distance that postpones matches with the thickness of stator core; Postpone the parcel forming upper skeleton 20a extension be set to upper skeleton 20a mono-side in the edge of the skeleton grooves of described lower skeleton 20b.

In addition, described upper and lower skeleton 20a, a 20b side are away from each other provided with projection, described projection comprise be arranged on skeleton tooth 22 suspend end the first projection 24 and be arranged on the second projection 25 on skeleton body 21.The arrangement convenience coiling of first and

second projection

24,25, cabling, concrete shape and the position of first and

second projection

24,25 are determined according to the technique of stator, repeat no more here.

Consult Fig. 7, Fig. 8, in order to embody the beneficial effects of the utility model, the motor of here facewidth stator such as existing and the facewidth stator such as not of the present utility model being made has carried out noise spectrum test.Wherein Fig. 7 is the motor that adopts the facewidth stator punching such as common to make, motor packs into after air-conditioning load, load noise with spectrum measurement instrument test complete machine, we from test result figure can clearly find out, when 360Hz, there is noise peak, complete machine can be obviously recognized at scene different sound, people's ear feels under the weather, certainly, when not every motor is tested, be all that peak value appears in 360Hz, as described in background technology part, general easily occur that the frequency of peak value is 45*n(n=2,3,4,5,6,7,8) Hz.Fig. 8 is the motor that the facewidth stator punching such as adopts not to make, and is with a load with the former, and only the facewidth changes, load noise with spectrum measurement instrument test complete machine, from test result, we can clearly find out, no longer include peak value and occur, in addition the total decibel value decline of complete machine noise 5.67dB.By testing us, can learn, by the facewidth is set not etc., not only eliminate peak noise, also make total decibel value decline, effectively improve noise.

Claims

1. a stator punching, comprise circular yoke portion (11), described yoke portion (11) extends inwardly punching tooth (12) is set along annulus radial direction, punching tooth (12) is arranged along the circumferentially even interval of annulus, between adjacent two punching teeth (12), form punching groove (13), it is characterized in that: the facewidth of described any two adjacent punching teeth (12) is different.

2. stator punching as claimed in claim 1, is characterized in that: described punching tooth (12) comprises canine tooth (121), middle tooth (122) and little tooth (123), and large, medium and small tooth (121,122,123) circumferentially repeats to arrange along annulus successively.

3. stator punching as claimed in claim 2, it is characterized in that: the facewidth D2 of described middle tooth (122) equals half of canine tooth (121) facewidth D1 and little tooth (123) facewidth D3 sum, the end profile that suspends of large, medium and small tooth (121,122,123) matches and is T-shaped; The periphery of described yoke portion (11) is provided with a locating notch (14).

4. a stator that adopts stator punching claimed in claim 1 to make, it is characterized in that: comprise stator core, skeleton (20) and coil, described stator core is overrided to form by stator punching (10), stator core is outside equipped with skeleton (20), and the enamelled wire that is wound with coil on coil and each tooth on the tooth of stator core is equal in length.

5. stator as claimed in claim 4, is characterized in that: described punching tooth (12) comprises canine tooth (121), middle tooth (122) and little tooth (123), and large, medium and small tooth (121,122,123) circumferentially repeats to arrange along annulus successively.

6. stator as claimed in claim 5, it is characterized in that: the facewidth D2 of described middle tooth (122) equals half of canine tooth (121) facewidth D1 and little tooth (123) facewidth D3 sum, the end profile that suspends of large, medium and small tooth (121,122,123) matches and is T-shaped; The periphery of described yoke portion (11) is provided with a locating notch (14).

7. the stator as described in claim 5 or 6, it is characterized in that: described skeleton (20) consists of upper and lower skeleton (20a, 20b), described upper and lower skeleton (20a, 20b) includes the skeleton body (21) matching with described yoke portion (11), skeleton body (21) extends inwardly a plurality of skeleton teeth (22) is set along itself radial direction, skeleton tooth (22) matches with quantity, the position of described punching tooth (12), and the facewidth of described skeleton tooth (22) all matches with described canine tooth (121) width; Between adjacent skeleton tooth (22), form skeleton grooves (23).

8. stator as claimed in claim 7, is characterized in that: postpone the parcel forming stator iron core tooth is set to lower skeleton (20b) side in the edge of the skeleton grooves of described upper skeleton (20a), and its distance that postpones matches with the thickness of stator core; Postpone the parcel forming upper skeleton (20a) extension be set to upper skeleton (20a) side in the edge of the skeleton grooves of described lower skeleton (20b).

9. stator as claimed in claim 8, it is characterized in that: described upper and lower skeleton (20a, a 20b) side is away from each other provided with projection, described projection comprise be arranged on skeleton tooth (22) suspend end the first projection (24) and be arranged on the second projection (25) on skeleton body (21).