CN101685990B

CN101685990B - Motor

Info

Publication number: CN101685990B
Application number: CN 200810216336
Authority: CN
Inventors: 黄道凡; 于彪; 廖添军
Original assignee: Johnson Electric Shenzhen Co Ltd
Current assignee: Johnson Electric Shenzhen Co Ltd
Priority date: 2008-09-23
Filing date: 2008-09-23
Publication date: 2013-06-12
Anticipated expiration: 2028-09-23
Also published as: DE102009042601A1; JP2010094018A; CN101685990A

Abstract

The invention provides a motor which comprises a stator and a rotor (20) positioned in the stator, wherein the stator comprises a shell and a plurality of magnets (12a-12d), wherein the shell comprises a plurality of side walls (10a-10d) and cambered connection parts (11a-11d) for connecting two adjacent side walls, and the radial cross section of the shell is a polygon with round angles; the magnets (12a-12d) are installed inside the cambered connection parts and are separated mutually; each outside surface is attached to the inside surfaces of two adjacent side walls (10a-10b), and a gap exists between each outside surface and the inside surface of the cambered connection part (11a) for connecting the two side walls; and air gaps exist between the inside surface of each of the magnets (12a-12d) and the outside surface of the rotor (20). The shell of the motor of the invention is the polygon, thereby being convenient for transportation and installation; the magnets are installed on the cambered connection parts, thereby effectively utilizing the space; and the gap existing between each magnet and each cambered connection part can be used for containing adhesives to firmly install the magnets.

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 arranged in 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) easily roll in transportation; 2) inconvenience is installed, needs extra positioner.

Figure 2 shows that a kind of square motor of industry exploitation in recent years, 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 arranged in 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 is not utilized; 2) rotor diameter equals shell sizes and deducts the thickness of shell and the thickness of permanent magnet, in the situation that require the motor housing size less, the external diameter of rotor can be subjected to the restriction of shell and magnet thickness.

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 adjacent two sidewalls, and the radial cross-section of described shell is the polygon with fillet; Described stator also comprises some blocks of magnet of the inboard that is installed on described arc connecting portion, described some blocks of magnet are spaced, the outer surface of described magnet be posted by two adjacent sidewalls inner surface and with the inner surface of the arc connecting portion that is connected these two sidewalls between have the space, have air gap between the inner surface of described magnet and the outer surface of described rotor.

The beneficial effect that illustrated embodiment of the present invention has: the shell of motor is polygon, convenient transportation and installation; In addition, the magnet of motor is installed the inboard of the arc connecting portion that connects in the enclosure adjacent two sidewalls, has improved the utilance of outer casing space.In addition, there is the space between the inner surface of magnet outer surface and arc connecting portion, can be used for accommodating binding agent so that magnet is adhered to shell more firmly.

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 use, 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 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 rotor 20 is arranged in stator.Stator comprises shell and installation magnet 12a～12d in the enclosure.The radial cross-section of shell 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.Four magnet 12a～12d are arranged on respectively the inboard of four arc connecting portion 11a～11d.The outer surface of every block of magnet is posted by the inner surface of two adjacent sidewalls, and with the inner surface of the arc connecting portion that is connected these two sidewalls between have the space.For example, magnet 12a outer surface abuts on the inner surface of sidewall 10a, 10b, and and the inner surface of arc connecting portion 11a between have the space.This space can be used for accommodating binding agent so that magnet is adhered to shell more firmly.On the other hand, there is the space between magnet 12a～12d and arc connecting portion 11a～11d, magnet can be installed more firmly, for example, when magnet 12a is installed, magnet 12a can be pushed to the inboard of arc connecting portion 11a, the two ends that make magnet 12a are clamped by two sidewall 10a of correspondence and 10b.

In addition, air gap between the outer surface of the inner surface of magnet 12a～12d and rotor 20 is to allow that rotor 20 is with respect to stator rotation.As a kind of preferred version, the width of air gap of the outer surface of the inner surface of magnet 12a～12d and rotor 20 is inconsistent, particularly, in the inner surface of magnet 12a～12d, corresponding to the width of air gap between the outer surface of the part inner surface of arc connecting portion 11a～11d inboard and rotor 20, less than the inner surface of other parts of magnet 12a～12d and the width of air gap between rotor 20.In another preferred version, the inner surface of magnet 12a～12d is cambered surface, and on described cambered surface, air gap corresponding to magnet 12a～12d thickness is the narrowest, and the air gap that magnet 12a～the 12d thinnest part is corresponding is the widest.The inconsistent air gap of this width helps to reduce the reluctance torque (magneticdetent torque) of rotor 20, and the risk that reduces demagnetization (demagnetisation).

As a kind of preferred version, arc connecting portion 11a～11d is uniform thickness (for example thickness of 1 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 1, the center of circle O ' of arc connecting portion 11c 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 inner surface of magnet 12a～12d is cambered surface, and the radius of curvature of the inner surface of arc connecting portion 11a～11d is greater than the outer surface radius of curvature of magnet 12a～12d.

As another kind of improvement project, magnet 12a～12d is arc, and 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 magnet 12a～12d is 1.1～1.4.In a preferred version, the ratio of the radius of curvature of the radius of curvature of the inner surface of arc connecting portion 11a～11d and the outer surface of magnet 12a～12d is 11.8/9.95, approximates 1.19.

As another kind of improvement project, magnet 12a～12d is symmetrical arcuate structure, and the symmetrical center line of each piece magnet is through the center of rotation O of rotor 20, and the radius of curvature of the inner surface of each piece magnet is 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 magnet is inconsistent, and the width of air gap at magnet symmetrical centre place is minimum, and the width of air gap of magnet two ends is maximum.This symmetric structure is convenient to make and assembling.

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

In the embodiment shown in fig. 3, wherein the polarised direction of two adjacent magnet 12a and 12b be the arctic outwardly, the polarised direction of other two adjacent magnet 12c and 12d be the South Pole outwardly, enter the South Pole of magnet 12d after the magnetic line of force process shell that send the arctic of magnet 12a, then get back to the South Pole of magnet 12a through rotor 20.Similarly, enter the South Pole of magnet 12c after the magnetic line of force process shell that send the arctic of magnet 12b, then get back to the South Pole of magnet 12b through rotor 20.Like this, four magnet 12a～12d form two magnetic poles altogether.Understandably, 4 magnet 12a～12d can have different polarised directions, thereby form four magnetic poles or eight magnetic poles.The shell that those skilled in the art will realize that motor of the present invention is not limited to 4 sidewalls and 4 arc connecting portions, and the shell of motor of the present invention can also comprise sidewall and the arc connecting portion of greater number.

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, described shell comprises at least four flat sidewalls (10a～10d) and connect some arc connecting portions (11a～11d) of each adjacent two sidewalls, the radial cross-section of described shell is the polygon with fillet, and described fillet is formed by described arc connecting portion;

described stator also comprises the some blocks of magnet (12a～12d) of the inboard that is installed on described arc connecting portion, described some blocks of magnet (12a～12d) spaced, the outer surface of every block of magnet (12a) only be posted by two adjacent sidewalls (inner surface of 10a～10b) and with the inner surface of the arc connecting portion (11a) that is connected these two sidewalls between have the space, thereby make the outer surface of magnet mutually not contact with the inner surface of arc connecting portion, (there is air gap in described magnet between 12a～inner surface 12d) and the outer surface of described rotor (20).

2. motor according to claim 1, it is characterized in that, described magnet is (in the inner surface of 12a～12d), (width of air gap between the part that 11a～11d) is inboard and the outer surface of described rotor (20) is less than described magnet (inner surface of other parts of 12a～12d) and the width of air gap between described rotor (20) corresponding to described arc connecting portion.

3. motor according to claim 2, it is characterized in that, (inner surface of 12a～12d) is cambered surface to described magnet, on described cambered surface, (air gap corresponding to the thickness of 12a～12d) is the narrowest, and (air gap that 12a～12d) thinnest part is corresponding is the widest for described magnet for described magnet.

4. motor according to claim 3, is characterized in that, (radius of curvature of the inner surface of 11a～11d) is greater than the described magnet (radius of curvature of the outer surface of 12a～12d) for described arc connecting portion.

5. motor according to claim 3, 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).

6. motor according to claim 3, is characterized in that, ((ratio range of the radius of curvature of the inner surface of 12a～12d) is 1.1～1.4 to described arc connecting portion for the radius of curvature of the inner surface of 11a～11d) and described magnet.

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

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

9. motor according to claim 7, is characterized in that, described magnet is four, forms altogether two magnetic poles or eight magnetic poles.

10. motor according to claim 7, is characterized in that, the cross section of described shell is quadrangle; Described magnet is four, is installed on respectively four arc connecting portions of described shell.