CN101728879B

CN101728879B - Motor

Info

Publication number: CN101728879B
Application number: CN200810217074.5A
Authority: CN
Inventors: 黄道凡; 于彪; 廖添军
Original assignee: Johnson Electric Shenzhen Co Ltd
Current assignee: Dechang Electric Machinery Jiangmen Co ltd
Priority date: 2008-10-24
Filing date: 2008-10-24
Publication date: 2013-04-24
Anticipated expiration: 2028-10-24
Also published as: JP2010104229A; CN101728879A; DE102009050306A1; JP5650395B2

Abstract

The invention discloses a motor, which comprises a stator and a rotor (20). The stator comprises a casing (10) and an annular magnet (12) which leans against the inner side of the casing. The casing (10) has a rounded polygonal radial cross section and comprises a plurality of side walls (10a-10d) and a plurality of curved connecting parts (11a-11d) connecting two adjacent side walls. The part, corresponding to the plurality of curved connecting parts (11a-11d), of the annular magnet is thicker than the part of side walls (10a-10d) to which the annular magnet leans against, and an air gap is reserved between the inner surface of the annular magnet and the outer surface of the rotor (20), wherein the inner surface of the annular magnet is a curved surface in which the part corresponding to the plurality of curved connecting parts (11a-11d) radially protrudes more than the part the part corresponding to the plurality of side walls (10a-10d) do, so that the air gas corresponding to the plurality of curved connecting parts (11a-11d) is narrower than air gas corresponding to the plurality of side walls (10a-10d). The motor has a polygonal casing, is conveniently to transport and install and has high space utilization rate in the casing.

Description

A kind of motor

Technical field

The present invention relates to machine field, relate in particular to a kind of stator structure of motor.

Background technology

Figure 1 shows that a kind of sectional view of traditional permanent magnet DC motor, this kind motor adopts columniform shell 1, and rotor 3 is installed in the cylinder blanket 1, permanent magnet 2 be fixed to cylinder blanket 1 inboard and be distributed in rotor 3 around.Yet there is following problem in the motor with this kind contour structures: 1) roll easily in the transportation; 2) inconvenience is installed, needs extra positioner.

Figure 2 shows that a kind of square motor of in recent years industry exploitation, this kind motor adopts square shell 1 ', and permanent magnet 2 ' is installed on four sidewalls of shell 1 ' inner surface, and rotor 3 ' is installed in the shell 1 ', and permanent magnet 2 ' is distributed in rotor 3 ' on every side.Although the motor of this kind tool square shell has solved the deficiency of above-mentioned traditional cylindrical motor, yet there is following problem in it: 1) the outer casing space utilance is low, the space at place, four angles does not obtain utilizing; 2) rotor diameter equals shell sizes and deducts the thickness of shell and the thickness of permanent magnet, is requiring in the less situation of motor housing size, and the external diameter of rotor can be subjected to the restriction of shell and magnet thickness.In addition, magnet and the air gap between the rotor of existing this square motor are uniform thickness, and reluctance torque (magnetic detent torque) is large and to have demagnetization (demagnetisation) risk higher.

Therefore, be necessary to develop a kind of novel high square motor of space availability ratio.

Summary of the invention

For the low defective of above-mentioned existing square motor outer casing space utilance, the invention provides the high motor of a kind of space availability ratio.

For realizing the object of the invention, the invention provides a kind of motor, comprise stator and be positioned at the rotor of described stator, described stator comprises a shell, described shell comprises some sidewalls and connects the arc connecting portion of two adjacent sidewalls that the radial cross-section of described shell is the fillet polygon; Described stator also comprises the annular magnet that abuts in described shell inboard, described annular magnet corresponding to the thickness of the part of the described arc connecting portion thickness greater than the part of the described sidewall that reclines, there is air gap between the inner surface of described annular magnet and the outer surface of described rotor, the inner surface of described annular magnet is cambered surface, in the described cambered surface, the part corresponding with described arc connecting portion is than radially protruding with part corresponding to described sidewall, so that the width of air gap corresponding with described arc connecting portion is less than the width of air gap corresponding with described sidewall.

Preferably, the air gap corresponding with described annular magnet thickness is the narrowest, and the air gap corresponding with described annular magnet thinnest part is the widest.

Preferably, there is the space between the inner surface of the part outer surface of described annular magnet and described arc connecting portion or sidewall of living in.

The beneficial effect that illustrated embodiment of the present invention has: the shell of motor is polygon, convenient transportation and installation; Adopted annular magnet, ease of assembly; In this annular magnet, the thickness of the part corresponding with the arc connecting portion has effectively utilized the space in the shell greater than the thickness of the part of the sidewall that reclines, and has improved the utilance of outer casing space.

In order further to understand feature of the present invention and technology contents, see also following about detailed description of the present invention and accompanying drawing, yet appended graphic only provide with reference to and the explanation usefulness, the present invention is limited.

Description of drawings

Below in conjunction with accompanying drawing, by the specific embodiment of the present invention is described in detail, will make technical scheme of the present invention and other beneficial effects apparent.In the accompanying drawing:

Fig. 1 is a kind of sectional view of traditional direct current machine;

Fig. 2 is the sectional view of the traditional direct current machine of another kind;

Fig. 3 is the schematic cross-section of the motor of one embodiment of the invention.

Embodiment

Describe the present invention below in conjunction with accompanying drawing.

Fig. 3 is the schematic diagram of radial cross-section of the motor of one embodiment of the invention.As shown in Figure 3, this motor comprises stator and rotor 20, and stator comprises shell 10 and installation annular magnet 12 in the enclosure, and rotor 20 is installed in the annular magnet 12, can rotate in stator, and the circle that is illustrated by the broken lines among the figure is the outer contour of rotor 20.The radial cross-section of shell 10 be one with the quadrangle of fillet, it comprises four sidewall 10a～10d and four arc connecting portion 11a～11d, particularly, arc connecting portion 11a connects adjacent two sidewall 10a and 10b, arc connecting portion 11b connects adjacent two sidewall 10b and 10c, and the rest may be inferred for other.

As shown in Figure 3, annular magnet 12 is installed in the inboard of shell 10, and the thickness of the part that annular magnet 12 is corresponding with arc connecting portion 11a～11d is greater than the thickness of the part that clings to sidewall 10a～10d.Annular magnet 12 be looped around rotor 20 around.Exist air gap 123 to allow that rotor 20 is with respect to stator rotation between the inner surface of the outer surface of rotor 20 and annular magnet 12.The inner surface of annular magnet 12 is cambered surface, but the width of air gap of the outer surface of this cambered surface and rotor 20 is inconsistent, particularly, in this cambered surface, compare corresponding to radially protruding the position of sidewall 10a～10d, so that the width of air gap corresponding with arc connecting portion 11a～11d is less than the width of air gap corresponding with sidewall 10a～10d position corresponding to arc connecting portion 11a～11d.In a preferred version, the air gap corresponding with the thickness of annular magnet 12 is the narrowest, and the air gap corresponding with annular magnet 12 thinnest parts is the widest.The inconsistent air gap of this width helps to reduce the reluctance torque (magnetic detent torque) of rotor 20, and the risk that reduces demagnetization (demagnetisation).

In addition, exist space 121 between the inner surface of the outer surface of annular magnet 12 and arc connecting portion 11a～11d, similarly, the part outer surface of annular magnet 12 also can and sidewall connecting portion 10a～10d between have the space, this space can be used for accommodating binding agent so that annular magnet 12 is adhered to shell 10 more firmly.On the other hand, there is the space in arc connecting portion place, also is convenient to annular magnet 12 is assembled into the inboard of shell 10.

As a kind of preferred version, arc connecting portion 11a～11d is uniform thickness (for example thickness of 1 millimeter or 0.8 millimeter) so that make, and the center of rotation of rotor 20 is departed from the center of circle of each arc connecting portion.For example, as shown in Figure 3, the center of circle O ' of arc connecting portion 11a departs from the center of rotation O of rotor 20.Under this scheme, the curvature of the outer surface of the ratio of curvature rotor 20 of arc connecting portion 11a～11d is little, seems comparatively level and smooth.

As another kind of improvement project, the radius of curvature of the inner surface of arc connecting portion 11a～11d greater than part corresponding with each arc connecting portion 11a～11d in the annular magnet 12 the outer surface radius of curvature.

As another kind of improvement project, the ratio range of the radius of curvature of the radius of curvature of the inner surface of arc connecting portion 11a～11d and the inner surface of annular magnet 12 is 1.1～1.8.In a preferred version, the ratio with the radius of curvature of the inner surface of part corresponding to sidewall 10a～11d in the radius of curvature of the inner surface of arc connecting portion 11a～11d and the annular magnet 12 is 11.80/6.84, approximates 1.73.As mentioned above, in the inner surface of annular magnet 12, the radius of curvature of the part corresponding with sidewall 10a～11d (being called the first radius) is less than the radius of curvature corresponding with arc connecting portion 11a～11d (being called the second radius), therefore, in this embodiment, the ratio of the radius of curvature of the inner surface of arc connecting portion 11a～11d and above-mentioned the second radius will be less than 1.73.

As another kind of improvement project, annular magnet 12 is symmetrical about the diagonal of shell 10, symmetrical center line is through the center of rotation O of rotor 20, and in the annular magnet 12 radius of curvature of the inner surface of the part corresponding with arc connecting portion 11a～11b greater than the radius of curvature of the outer surface of rotor 20.Under this scheme, the air gap ground width between rotor 20 and the annular magnet 12 is inconsistent, and the width of air gap at this symmetrical center line place is minimum, and the width of air gap of the center of close each sidewall 10a～10d is maximum.This symmetric structure is convenient to make and assembling.

As another preferred version, shell is uniform thickness (for example all being 0.8,0.9 or 1 millimeter thickness), so that processing and manufacturing, to effectively utilize the space in the shell.

As a kind of alternative, the thickness of arc connecting portion 11a～11d is greater than the thickness of sidewall 10a～11d, and for example, the thickness of sidewall 10a～11d is 1 millimeter, and the thickness of arc connecting portion 11a～11d is 1～1.1 millimeter.

Below by reference to the accompanying drawings the present invention is set forth.The radial cross-section that those skilled in the art will realize that the shell of motor of the present invention with the quadrangle of fillet for example is not limited to, and the radial cross-section of the shell of motor of the present invention can be pentagon, hexagon with fillet etc.

The above for the person of ordinary skill of the art, can make other various corresponding changes and distortion according to technical scheme of the present invention and technical conceive, and all these changes and distortion all should belong to the protection range of claim of the present invention.

Claims

1. motor comprises stator and is positioned at the rotor (20) of described stator, it is characterized in that:

Described stator comprises a shell (10), and the radial cross-section of described shell (10) is the fillet quadrangle, and described shell comprises four sidewalls (10a～10d) and connect the arc connecting portion (11a～11d) of two adjacent sidewalls;

Described stator also comprises the annular magnet (12) that abuts in described shell (10) inboard, described annular magnet (12) (thickness of the part of 11a～11d) is greater than the described sidewall that the reclines (thickness of the part of 10a～10d) corresponding to described arc connecting portion, there is air gap (123) between the outer surface of the inner surface of described annular magnet (12) and described rotor (20), the inner surface of described annular magnet (12) is cambered surface, in the described cambered surface, (part corresponding to 11a～11d) is than (part of 10a～10d) corresponding is radially protruded with described sidewall with described arc connecting portion, so that with described arc connecting portion (width of air gap corresponding to 11a～11d) less than with the described sidewall (width of air gap that 10a～10d) is corresponding, the air gap corresponding with described annular magnet (12) thickness is the narrowest, and the air gap corresponding with described annular magnet (12) thinnest part is the widest.

2. motor according to claim 1 is characterized in that, (there are space (121) in the part outer surface of described annular magnet (12) and described arc connecting portion between the inner surface of 11a～11d).

3. motor according to claim 1 is characterized in that, (there are the space in the part outer surface of described annular magnet (12) and described sidewall between the inner surface of 10a～10d).

4. motor according to claim 1 is characterized in that, (11a～11d) is uniform thickness to described arc connecting portion, and its center of circle (O ') departs from the center of rotation (O) of described rotor (20).

5. motor according to claim 1, it is characterized in that (radius of curvature of the inner surface of 11a～11d) is greater than the radius of curvature of the outer surface of the part corresponding with described arc connecting portion of described annular magnet (12) for described arc connecting portion.

6. motor according to claim 1 is characterized in that, (ratio range of the radius of curvature of the radius of curvature of the inner surface of 11a～11d) and the inner surface of described annular magnet (12) is 1.1～1.8 to described arc connecting portion.

7. the described motor of any one in 6 according to claim 1 is characterized in that described shell is uniform thickness.

8. the described motor of any one in 6 according to claim 1 is characterized in that, (thickness of 11a～11d) is greater than the described sidewall (thickness of 10a～10d) for described arc connecting portion.