CN100576702C - Small-sized DC motor - Google Patents
Small-sized DC motor Download PDFInfo
- Publication number
- CN100576702C CN100576702C CN200610092439A CN200610092439A CN100576702C CN 100576702 C CN100576702 C CN 100576702C CN 200610092439 A CN200610092439 A CN 200610092439A CN 200610092439 A CN200610092439 A CN 200610092439A CN 100576702 C CN100576702 C CN 100576702C
- Authority
- CN
- China
- Prior art keywords
- magnet
- motor
- motor frame
- sized
- small
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Dc Machiner (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
A kind of small-sized DC motor comprises motor frame, described motor frame has a barrel, described barrel has constant thickness and has the cross section of the shape that comprises four limits and coupling part, each coupling part connects adjacent both sides in described four limits, and is positioned at the inboard of the tetragonal respective corners that comprises described four limits; Described motor frame also has magnet, and described magnet inboard has circumferential surface and its outside and contacting that described motor frame matches.
Description
Technical field
The present invention relates to the little and easy-to-install small-sized DC motor of a kind of volume.
Background technology
In the DC motor that is used for laser printer, ink-jet printer and other electronic equipment, there are such needs, that is, when keeping motor performance, reduce motor size.
Therefore, keep determining in the shape of the magnetic part (magnet, motor frame) by changing retaining element making the profile of motor less under the state of magnetic part (external diameter of armature core and lamination thickness) of rotating element of motor performance.
For the DC motor that will be rotated because magnetized number of magnetic poles (N: positive count) with the groove number (M: ratio positive count) becomes 2N: 3M substantially, thus the number of magnetic poles of magnet magnetization be 2 utmost points, 4 utmost points, 6 utmost points, 8 utmost points ....Usually, DC motor forms oval and cylindric, and under the situation of oval motor, magnet is geomagnetic into 2 utmost points, and under the situation of cylindric motor, magnet is geomagnetic into the 2 best 2N utmost points.For the cylindric motor that will reduce size, grade (ceiling capacity product: (BH)
Max) increase, when keeping motor performance, the thickness of magnet reduces, and external diameter unshakable in one's determination reduces.Yet under the situation that magnet thickness changes, in general, it is very difficult only keeping motor performance by the grade that promotes magnet.
In addition, reduce in the motor of size at needs, owing to must dwindle spatial accommodation, so will form motor frame as small as possible.Therefore, under many circumstances, motor frame forms cylindric and oval so that the coupling rotor shapes, and for a class motor frame of field magnet is installed on it, also uses cylindric and oval similarly.
Below prior art is disclosed in JP-A-07-059322 (meaning of term " JP-A " is " the not disclosed Japanese patent application of substantive examination " as used herein), it attempts realizing that the motor external dimensions reduces and is easy to installation when keeping motor performance.By the number quadrangle identical that motor frame is formed its bight with the pole magnetization number of magnet, in the profile that does not change armature core, thereby and further keep to reduce motor size under the situation of motor performance at the thickness of the core that does not reduce the magnet magnetic pole.
Fig. 8 is the sectional view of the small-sized DC motor described in JP-A-07-059322.
Small-sized DC motor 100 among Fig. 8 comprises: quadrangle tubular motor frame 101, and it has and is essentially foursquare cross section; Magnet 102, it is contained in the motor frame 101, and has a cylindric space in magnet 102, and magnet 102 has as follows that alternating magnetization is four magnetic poles of the N utmost point and the S utmost point, this mode is that the center of magnetic pole lays respectively at quadrangle tubular motor frame bight; Rotor 103, it is contained in the described cylindric space with certain radial gap; And the feed end (not shown), its layback from quadrangle tubular motor frame 101 goes out, and uses thereby this motor can be lain in a horizontal plane on the printed circuit board (PCB) (not shown).
In JP-A-07-059322 in the disclosed small-sized DC motor 100 with four field magnetic pole magnet 102, field magnet 102 has four magnetic poles that alternating magnetization is the N utmost point and the S utmost point, the motor frame that holds field magnet 102 forms to have and is essentially foursquare cross section, and magnetizing field magnet 102 makes the foursquare bight of being centered close to of magnetic pole.Magnet as field magnet 102 is made up of plastic magnet, and with 101 moulding of quadrangle tubular motor frame.
According to this structure and since motor take the angle or quadrangular prism shape, so can bondingly be fixed to printed circuit board (PCB) etc. to this motor by bringing with the viscosity dual coating.Because the thickness at quadrangle bight magnet 102 increases, actual unit permeance increases.
Yet, in the small-sized DC motor of in JP-A-07-059322, describing because even four jiaos of motor frame all filled magnet, so the thickness of this magnet thickness more required than actual driveability is big.That is, when from radially the seeing of center of rotation, the thickness of magnet becomes the thickest at the magnet segment corresponding with four angle parts of motor frame, and has surpassed the magnet thickness of the position that is formed with the required sine curve characteristic of magnetic (magnetic flux density).Therefore, can cut certain scope to the magnet segment corresponding with four angle parts of motor frame, this scope that cuts can not make magnetic go wrong.
In addition, owing to have an advantage, that is, when the fixed motor frame, can have under the situation of a plurality of flat sides fixed motor frame easily at motor frame, so, can be regarded as that integral body has this advantage under the situation that the part in each original flat side of motor frame all is kept perfectly.Aforementioned prior art example has these pointed problems.
Summary of the invention
Consider pointed problem, one object of the present invention is to provide a kind of small-sized DC motor, and it is easy to install, and reduces size under the situation that does not reduce driveability.
To provide following scheme in order to reach this purpose.
(1) provides a kind of small-sized DC motor that comprises motor frame, described motor frame comprises a barrel, described barrel has constant thickness and has the cross section of the shape that comprises four limits and coupling part, each coupling part connects adjacent both sides in described four limits, and is positioned at the inboard of the tetragonal respective corners that comprises described four limits; And described motor frame also has magnet, and its inboard has circumferential surface and its outside and contacting that described motor frame matches.
(2) provide a kind of as above (1) described small-sized DC motor, wherein, each coupling part is an arc.
(3) provide a kind of as above (1) described small-sized DC motor, wherein, each coupling part is an arc, and the radius of the circumferential surface of described arc and described magnet is proportional.
(4) provide a kind of as above (1) described small-sized DC motor, wherein, each coupling part is a linear.
(5) provide a kind of as above (1) described small-sized DC motor, wherein, being shaped as of the cross section of described motor frame has individual limit of 2 (n+1) and angle, and n represents a positive integer.
(6) provide a kind of as above (1) described small-sized DC motor, wherein, described magnet is included in the part that alternately is magnetized to different magnetic poles on the direction of circumferential surface.
(7) provide a kind of as above (6) described small-sized DC motor, wherein, magnetized part is separated from each other.
(8) provide a kind of as above (6) described small-sized DC motor, wherein, the part that is magnetized to different magnetic poles contacts with one of coupling part of described motor frame.
(9) provide a kind of as above (1) described small-sized DC motor, wherein, the ratio of make progress in the footpath of described magnet Breadth Maximum (L2) and minimum widith (L1) is set in the scope of 2.0≤L2/L1≤3.0.
(10) provide a kind of as above (3) described small-sized DC motor, wherein, the scope from 65% to 85% of the arc of described coupling part and the ratio of the radius of the circumferential surface of described magnet.
(11) provide a kind of as above (1) described small-sized DC motor, it comprises the armature component that is placed in rotatably in the described motor frame, and wherein, described armature component comprises: by the armature winding profile member of the tubular coil of magnet-wire coiled; And interior yoke, it comprises the barrel of fixing with in the face of the mode of described armature winding profile member.
(12) provide a kind of as above (1) described small-sized DC motor, it comprises the armature component that is placed in rotatably in the described motor frame, and wherein, described armature component comprises: by the armature winding profile member of the tubular coil of magnet-wire coiled; And tubular mobile background yoke, the interior side contacts of itself and described armature winding profile member.
Because small-sized DC motor of the present invention is made into such as comprising motor frame and magnet, wherein said motor frame comprises barrel, described barrel has constant thickness and has the cross section of the shape that comprises four limits and coupling part, each coupling part connects both sides adjacent in four limits, and be arranged in the inboard of the respective corners of the quadrangle that comprises described four limits, described magnet inboard has circumferential surface and its outside and contacting that described motor frame matches, therefore, the shape of this magnet can become littler dimensionally, keep required magnetic simultaneously, and relevant therewith is that the shape of described motor frame can be made and be easy to installation and littler dimensionally.
Even, also have desired advantage being shaped as under the situation with the individual limit of 2 (n+1) and angle of the cross section of described motor frame.In this, n represents a positive integer.
Because from seeing that radially the described magnet Breadth Maximum (L2) and the ratio of minimum widith (L1) are set in the scope of 2.0≤L2/L1≤3.0, so the shape of this magnet can be done forr a short time dimensionally, keep required magnetic simultaneously.
By having at centreless motor or slotless in the core motor in conjunction with field magnet structure of the present invention, those motor can be done forr a short time dimensionally, have increased the torque that will produce simultaneously.
Description of drawings
To understand the present invention disclosed herein better with reference to following accompanying drawing:
Figure 1A, 1E and 1I are the diagrammatic sketch of a side, Figure 1B, 1F and 1J are cross sectional view, Fig. 1 C, 1G and 1K are vertical diagrammatic sketch, and Fig. 1 D, 1H and 1L be other end diagrammatic sketch, and they are by comparing the characteristics that small-sized DC motor of the present invention has been described with existing example;
Fig. 2 A is by comparing the profile of the characteristics that motor frame of the present invention has been described with existing example, and Fig. 2 B is by comparing the vertical longitudinal sectional drawing of the amplification of the characteristic that magnet of the present invention has been described with existing example;
Fig. 3 A1 to 3E1 is the end diagrammatic sketch, and Fig. 3 A2 to 3E2 is transverse cross-sectional view, and they have illustrated various embodiment of the present invention, and Fig. 3 F1 is the end diagrammatic sketch, and Fig. 3 F2 is cross sectional view, and they have illustrated prior art embodiments;
Fig. 4 is by magnet L2 of the present invention: the torque characteristic figure that the ratio of L1 obtains;
Fig. 5 is the magnetic that obtains of the ratio by the radius of the turning R of magnet of the present invention and inside radius and the characteristic pattern of quality (cost);
Fig. 6 A is a longitudinal sectional drawing, and Fig. 6 B is a transverse cross-sectional view, and they show the centreless motor of having used magnet arrangement of the present invention;
Fig. 7 A is a longitudinal sectional drawing, and Fig. 7 B is a transverse cross-sectional view, and they show the slotless of having used magnet arrangement of the present invention the core motor; And
Fig. 8 is the transverse cross-sectional view of small-sized DC (DC) motor described among the JP-A-7-059322.
Embodiment
To describe exemplary embodiment of the present invention in detail based on accompanying drawing below.Yet, should be appreciated that this does not also mean that and limit the invention to specific embodiment.
(embodiment 1)
Figure 1A to 1L shows explanatory, and the characteristics of small-sized DC motor of the present invention have been described when comparing with existing like product.
Figure 1A to 1D shows the diagrammatic sketch of the structure of the existing general DC motor of utilizing ferrite lattice, wherein, Figure 1A is the diagrammatic sketch of a side when seeing by the indicated direction of arrow a among Fig. 1 C, Figure 1B is the transverse cross-sectional view of the line b-b in Fig. 1 C, Fig. 1 C is the profile of the line c-c in Figure 1B, and Fig. 1 D is the diagrammatic sketch of opposite side when seeing by the indicated direction of arrow d among Fig. 1 C.
In Figure 1A to 1D, adopt such structure, wherein, on direction of rotation, be geomagnetic into two magnet 105 that the N utmost point and the S utmost point and each all has a curved profile and be provided with axisymmetrically, be provided with the slit between two magnet 105 in mode along the sidewall of cylindric motor frame 106.
In this example, when the structure of the rotor that adopts diameter 23mm, the diameter of motor frame is 35.8mm.
Fig. 1 E to 1H shows the diagrammatic sketch of the structure of the existing DC motor of utilizing neodium magnet, wherein, Fig. 1 E is the diagrammatic sketch of a side when seeing by the indicated direction of arrow e among Fig. 1 G, Fig. 1 F is the transverse cross-sectional view of the line f-f in Fig. 1 G, Fig. 1 G is the profile of the line g-g in Fig. 1 F, and Fig. 1 H is the diagrammatic sketch of opposite side when seeing by the indicated direction of arrow h among Fig. 1 G.
In Fig. 1 E to 1H, adopt such structure, wherein, on direction of rotation, be geomagnetic into four magnet 111 that the N utmost point or the S utmost point and each all has a curved profile and be provided with axisymmetrically in mode along the sidewall of cylindric motor frame 112.Under the identical situation of root diameter, by the magnet grade from ferrite lattice ((BH) max (BaO6Fe shown in the less relatively Figure 1A of ceiling capacity product ((BH) max)
2O
3) 13 (J/m
3* 10
3), (BH) max (SrO6Fe
2O
3) 17 (J/m
3* 10
3)) change into neodium magnet ((BH) max (Nd in this relatively large example of ceiling capacity product ((BH) max)
2Fe
14B) 180 (J/m
3* 10
3)), can reduce the diameter of motor frame.In one example, have diameter when being the structure of rotor of 23mm in employing, the diameter of motor frame becomes 32mm.
Fig. 1 I to 1L shows the diagrammatic sketch of the structure of the small-sized DC motor of the present invention that utilizes neodium magnet, wherein, Fig. 1 I is the diagrammatic sketch of a side when seeing by the indicated direction of arrow i among Fig. 1 K, Fig. 1 J is the transverse cross-sectional view of the line j-j in Fig. 1 K, Fig. 1 K is the profile of the line k-k in Fig. 1 J, and Fig. 1 L is the diagrammatic sketch of opposite side when seeing by the 1 indicated direction of the arrow among Fig. 1 K.
In the small-sized DC motor shown in Fig. 1 I to 1L 1, adopt such structure, wherein, on direction of rotation, be geomagnetic into four magnet 2 that the N utmost point or the S utmost point and each all has a curved profile and be provided with axisymmetrically in mode along the sidewall of tubular motor frame 3, thus the annular of being formed.
The end cap 6 that is formed from a resin is assemblied in the openend of the barrel 4 of motor frame 3.End cap 6 has axle 7 opening that passes through and brushes, and described brush is suitable for contacting with a commutator that will be set on spools 7, and its end is press fitted on the end cap regularly.
In this embodiment, when employing has root diameter when being the structure of 23mm, the shortest external diameter of motor frame becomes 28.5mm.
In addition, the material of adopted magnet 2 is not the material that is different from the existing DC motor shown in the Fig. 1 (e) that utilizes neodium magnet.
When considering up to now described content, according to small-sized DC motor 1 of the present invention, by adopting small-sized DC motor 1 to comprise the structure of following motor frame 3 and magnet, promptly, described motor frame 3 comprises a barrel 4, the cross section that described barrel 4 has constant thickness and has the shape that comprises four limits and coupling part, each coupling part connects adjacent both sides in described four limits, and be positioned at the inboard of the tetragonal respective corners that comprises described four limits, described magnet inboard has circumferential surface and its outside and contacting that described motor frame matches, small-sized DC motor 1 of the present invention has following feature, promptly, the cross-sectional area of motor frame 3 can be minimized, keep keeping the required magnetic of driveability (according to the sine curve characteristic of rotation) simultaneously, and when when section is seen, because on the sidewall of motor frame 3, be formed with the plane that comprises the limit that constitutes by straight line, so, motor frame 3 can easily be installed.
(magnet shape)
In the part that constitutes DC motor, magnet is the most expensive part, therefore need when keeping motor performance its quality be minimized.
Various details magnet will compare with disclosed existing magnet among the JP-A-07-059322 simultaneously.
Fig. 2 A and 2B show explanatory, by with existing example in motor frame and magnet compare the characteristic that motor frame of the present invention and magnet have been described.
Specifically, the diagrammatic sketch shown in this be the existing magnet (with reference to Fig. 3 F1 and 3F2) described among the JP-A-07-059322, the magnet of the present invention (with reference to Fig. 3 C1 and 3C2) shown in Fig. 1 J, will describe after a while for the comparison diagrammatic sketch between the magnet with irregular octagonal representative motor frame (with reference to Fig. 3 B1 and 3B2).
Fig. 2 A shows each transverse cross-sectional view of motor frame, and Fig. 2 B shows the vertical section of amplification of a magnetic pole of magnet.
The shape of magnet at first will be described.
In Fig. 2 B, when the section of each magnetic pole of magnet when their inner surface is aligned with each other, the section of the existing magnet of describing among the JP-A-07-059322 adopts the shape f4 that is represented by solid line, the section of the magnet of the present invention shown in Fig. 1 J adopts the shape c4 that is illustrated by the broken lines, and adopts the shape b4 that is represented by chain-dotted line for the section of the magnet of irregular octagon sidewall.
According to shape b4 of the present invention and c4 is to obtain from the direct distortion of the inner surface of magnet the time at the angle of existing shape f4.
When the shape that obtains when the inner surface of magnet directly is out of shape at the angle that has shape f4 now is explained by the radial width at distance axle center, under the situation of shape b4, (=L1c) ratio is arranged in 2.0≤L2b/L1b≤3.0 scopes for the Breadth Maximum L2b at the two ends on the direction of rotation and width L1b, and under the situation of shape c4, the Breadth Maximum L2c at the two ends on the direction of rotation and the ratio of minimum widith L1c are arranged in 2.0≤L2c/L1c≤3.0 scopes.(ratio)
Next, explanation is arranged on the ratio of minimum widith/Breadth Maximum 1: 2 to 1: 3 the interior reason of scope.
By using Fig. 1 I measurement data shown in table 1 and the table 2 below the small-sized DC motor of the present invention shown in the 1L obtains.Employed motor is made of rotor with diameter 23mm and the motor frame with the shortest diameter 28.5mm.
Fig. 4 is the L2 by magnet: the torque characteristic figure that the L1 ratio obtains.Data shown in Fig. 4 are by the data of using the magnet shown in Fig. 1 J to measure, and sum up in the following Table 1.
Table 1
L2 by magnet: the torque characteristics that the L1 ratio obtains
| L2/L1 | Starting torque (mNm) | Cogging torque (mNm) |
| 0.0 | ||
| 0.5 | 68 | 30 |
| 1.0 | 76 | 24 |
| 1.5 | 88 | 18 |
| 2.0 | 95 | 23 |
| 2.5 | 96 | 26 |
| 3.0 | 97 | 27 |
| 3.5 | 98 | 29 |
| 4.0 | 100 | 30 |
| 4.5 | 100 | 31 |
| 5.0 | 100 | 30 |
| 5.5 | 100 | 29 |
In the torque characteristics shown in above, scope 2.0≤L2/L1≤3.0 of L2 and the ratio of L1 with starting torque relatively large and cogging torque relative less regional corresponding.
Next, will the shape that the angle surrounded of the magnet (with reference to Fig. 3 C1 and 3C2) shown in Fig. 1 J be described.
Fig. 5 is the magnetic relevant with the ratio of the radius of the turning R of magnet of the present invention and inside radius and the characteristic pattern of quality (cost).Data shown in Figure 5 are by the data of using the magnet shown in Fig. 1 J to measure, and are summarised in the following table 2.
Table 2
Magnetic that the radius of the turning R of magnet is relevant with the ratio of inside radius and quality (cost)
| The radius of turning R and the ratio of inside radius (%) | Starting torque (mNm) | Cost/quality (yen) |
| 0 | ||
| 13.5 | 100 | 164 |
| 25.5 | 100 | 158 |
| 37.5 | 100 | 149 |
| 49.0 | 98 | 138 |
| 61.0 | 97 | 123 |
| 74.0 | 96 | 108 |
| 85.0 | 95 | 89 |
| 97.0 | 88 | 66 |
| 110.0 | 76 | 16 |
With the ratio of the radius of magnet turning R and interior diameter (promptly, the radius of curvature at the turning of this magnet is with respect to interior diameter (radius)) be arranged in 65% to 85% the scope, as the scope that satisfies the condition that realizes following situation, described situation is, radius (forming the radius length of the arc of magnet positive camber) by the turning R of magnet is in the relative higher scope with the magnetic that the ratio of inside radius (forming the radius length of the arc of negative camber) obtains, simultaneously, by the mass property that the ratio of the radius of the turning R of magnet and inside radius obtains, promptly represent that with cost the characteristic of quality is in relatively cheap scope.
As a result, under the situation of the shape (R) that surrounds at the angle of magnet, one of following two conditions or all are set:
(1) ratio of the width L2 of magnet and width L1 is arranged on condition in 2.0≤L2/L1≤3.0 scopes; And
(2) ratio of the radius of the turning R of magnet and inside radius is arranged on condition in 65% to 85% scope.
On the other hand, under the situation of the magnet that is used for irregular octagon motor frame (with reference to Fig. 3 B1 and 3B2), described dihedral becomes at the straight line shown in the shape b4 in Fig. 2 B and carries out the shape that obtains after the straight cuts.Although the gradient of this straight line can be set arbitrarily basically, but, the gradient of this straight line is set to and the mutually tangent gradient of the arc of drawing by a radius, described radius is to extend from the center of the arc of the negative camber that has formed described magnet, the gradient of this straight line or be set to when when section is seen by the predetermined angle of outside straight portion of magnet, perhaps be set to angle with the polygonal shape coupling of described motor frame.
Cutting described angle with straight line with linear fashion and obtaining under the situation of described shape, the condition that the ratio of the width L2 of magnet and width L1 is arranged in 2.0≤L2/L1≤3.0 scopes is essential.
In addition, in small-sized DC motor of the present invention, can perhaps can be separated from each other the magnetized spot of magnet on a direction of circumferential surface, being the magnet alternating magnetization different magnetic poles.And the part that is magnetized to the magnet of different magnetic poles can have the part that contacts that matches with the coupling part of motor frame.
(shape of motor frame)
Fig. 2 A is the diagrammatic sketch of external shape that the section of motor frame is shown.
In the figure, the existing motor frame of describing in JP-A-07-059322 has constituted the shape f3 that represents with solid line, motor frame of the present invention shown in Fig. 1 J has constituted the shape c3 that is represented by dotted lines, and irregular octagon motor frame of the present invention has constituted the shape b3 that is represented by chain-dotted line.When the shape f3 with existing example compared, visible shape c3 of the present invention and b3 had constituted the shape that its angle is cut in a large number respectively, have reduced by the motor frame occupation space.In addition, owing to be formed with straight flange, can not vibrate so can stably install in the both sides of arc.
In addition, in small-sized DC motor of the present invention, each coupling part have arc, with the proportional arc of radius or the linear of the circumferential surface of magnet.
And the section shape of motor frame 3 can be the shape with the individual limit of 2 (n+1) and angle, and n represents positive integer.According to this structure, the basic configuration of the barrel 4 of motor frame 3 (shape that the bight obtains before collapsing) can have for example quadrangle, hexagon, octagon ...
(embodiment 2)
Below will by with existing example in magnet and motor frame compare magnet of the present invention and motor frame be described.
Fig. 3 A1 to 3E1 and Fig. 3 A2 to 3E2 show the explanatory of describing each embodiment of the present invention.Notice that in Fig. 3 A1 to 3E1 and Fig. 3 A2 to 3E2, the figure number suffix shows the diagrammatic sketch of the end plate of motor frame for the diagrammatic sketch of " 1 ".In other words, they show the diagrammatic sketch of each external shape of motor frame.The figure number suffix shows the diagrammatic sketch of each section of motor frame for the diagrammatic sketch of " 2 ".
In Fig. 3 A1 and 3A2, when when section is seen, motor frame 3a adopts circle basically, and magnet 2a forms such shape, this shape has guaranteed for keeping the necessary magnet magnetic conductivity of motor performance, this shape has suppressed the width that magnetic pole is changed into the magnet of minimum widith, this shape makes the ratio of L1: L2, promptly, the radial thickness L 1 of the reformed part of magnetic pole (the thinnest part) and the ratio of the radial thickness L2 of the core (thick) of magnetic pole, be set in 1: 2 to 1: 3 the scope, and this shape has stayed straight flange.
In Fig. 3 B1 and 3B2, when when section is seen, motor frame 3b forms irregular octagon, and magnet 2b forms such shape, and wherein, the thickness ratio of L1: L2 drops in 1: 2 to 1: 3 the scope, and has stayed straight flange.Other require with Fig. 3 A1 and 3A2 in require identical.
In Fig. 3 C1 and 3C2, when when section is seen, construct motor frame 3c by combination straight line and arc, the ratio of and L1: L2, that is, the ratio of the radial thickness L2 of the radial thickness L1 of the reformed part of magnetic pole (the thinnest part) and the core (thick) of magnetic pole is set in 1: 2 to 1: 3 the scope, in addition, be set in 65% to 85% the scope of inside radius (inner radius) of magnet 2c by the radius of the turning R of the magnet 2c of magnet 2c outer arcuate structure.
These are that the radial thickness of motor frame 3c is thinned to degree like this and does not cause the condition of the situation of practical problem.Yet, cause under the situation of practical problem at the thickness of motor frame 3c, need set up a condition at the situation of the inboard of the motor frame 3c that contacts that matches with magnet 2c.Optionally, consider the thickness of motor frame 3c, can be at arranged outside one condition of motor frame 3c.
In Fig. 3 D 1 and 3D2, when when section is seen, show the shape of motor, and the shape of this motor is constructed in the mode of the shape that is similar to the motor in other example with 8 utmost points and 12 grooves.Motor frame 3d has the shape that the mode identical with the mode shown in Fig. 3 B1 and the 3B2 shows.Structure magnet 2d like this, that is, respectively at corner arrangement 8 utmost points of motor frame 3d, the ratio of and L1: L2, that is, the ratio of the radial thickness L2 of the radial thickness L1 of the reformed part of magnetic pole (the thinnest part) and the core of magnetic pole is set in 1: 2 to 1: 3 the scope.
In Fig. 3 E1 and 3E2, when when section is seen, motor frame 3e is identical with the motor frame shown in Fig. 3 C1 and the 3C2, and will be adopted the structure that slit 8 is set between adjacent magnets by the magnetic pole of the magnet 2e of independent stationary for each.The ratio of L1: L2, it is the ratio of radially maximum ga(u)ge L2 of the core of the radially minimum thickness L1 of magnet 2e and magnetic pole, be set in 1: 2 to 1: 3 the scope, in addition, be set in 65% to 85% the scope of inside radius (inner radius) of magnet 2e by the radius of the turning R of the magnet 2e of magnet 2e outer arcuate structure.By adopting this structure, can provide and between adjacent magnets, not be provided with the small-sized DC motor identical functions of the present invention and the advantage in slit.
Space in the slit preferably is arranged in the scope that the motor driven performance do not descend.
(embodiment 3)
Fig. 6 A and 6B show the profile of the centreless motor of having used magnet arrangement of the present invention.
Fig. 6 A is the profile of the line n-n in Fig. 6 B, and Fig. 6 B is the transverse cross-sectional view of the line m-m in Fig. 6 A.Small-sized DC motor of the present invention comprises centreless motor 29 of the present invention.
This centreless motor 29 comprises a rotatable armature that is assemblied in the motor frame 30, and this motor frame 30 comprises commutator mould 37, armature winding profile member 38 and axle 7.
The motor frame 30 of centreless motor 29 comprise barrel 31, with barrel 31, the header portion 32 that is provided with continuously and the bearing pedestal parts 33 that are provided with continuously with header portion 32.In the inside of bearing pedestal part 33, thereby axle 7 is supported rotatably by two bearings 34,35 that are separately positioned on the upper and lower side of bearing pedestal part 33 separated from one another.One end and base plate 36 adjacency of axle 7.Commutator mould 37 is arranged on the axle 7.
Armature winding profile member 38 adopts such structure, that is, the coil of armature winding coiled is thin tubular, is fixed by resin thereafter, to the circuit on coil top tap 38a is being arranged, thereby links to each other with rise piece 39b by this tap 38a.Interior yoke 42 and field magnet 43 are placed on the fixation side in the mode that armature winding profile member 38 is remained on the rotation side between them.Interior yoke 42 comprises the barrel 42a and the sweep 42b that is placed on the base plate 36 in the face of armature winding profile member 38.Arrange field magnet 43 in the mode that the magnetic center with field magnet 43 is arranged to be complementary with coupling part 45, coupling part 45 connects together the independent side 44 of motor frame 30.
The magnetic flux short circuit that produces in the barrel 42a of interior yoke 42 and the field magnet 43, thus magnetic flux bleed-through reduced.
The external diameter of armature winding profile member 38 is set with respect to the internal diameter of the barrel 31 of motor frame 30, thereby, at the external diameter of armature winding profile member 38 near the position of the internal diameter of barrel 31, promptly, on the position in the center on each limit 44 under the situation of present embodiment, between barrel 31 and armature winding profile member 38 at the two ends of field magnet 43 along required minimal air gap G and width L1 only are set on the direction of rotation.In the example depicted in fig. 6, the core on each limit 44 carries out such setting.
Air gap G mainly by the accuracy of two building blocks, that is, determine by the external diameter accuracy of the accuracy of the internal diameter of motor frame 30 and armature winding profile member 38.Therefore, air gap G get about 0.1mm to the value of 0.5mm as actual size.
The radius of the arc on 45 inboards, bight of motor frame 30 is set to from the center of axle 7 to the arbitrary value of 5% to 85% scope of length of curved surfaces of the inside part 43a of the field magnet 43 that is positioned at axle 7 sides, therefore, armature winding profile member 38 can be arranged to diameter amplification under situation about not limited by the field magnet relevant with the position of settling 43, therefore, can increase the winding number of armature winding, thereby increase the torque that will produce.Preferably, the radius of the arc of the coupling part 45 of motor frame 30 is set to from the center of axle 7 to the arbitrary value of 65% to 85% scope of length of curved surfaces of the inside part 43a of the field magnet 43 that is positioned at axle 7 sides.
For example, field magnet 43 is by neodium magnet formations such as (Nd-Fe-B), radially or be magnetized on the direction of rotation, and is arranged in 45 places, coupling part of the barrel 31 with quadrangle section in the mode that is separated from each other.
The section shape of field magnet 43 is that inside part 43a (being positioned at a side that matches with armature winding profile member 38) is the arc that radius begins from the center of axle 7, makes Outboard Sections 43b be fixed to the inner surface 31a of the barrel 31 of motor frame 30 simultaneously.Coupling part 43c between inside part 43a and the Outboard Sections 43b has an angle, under this angle the inner surface 31a of the barrel 31 of coupling part 43c and motor frame 30 with right angle intersection, arbitrarily angled but coupling part 43c also can have.
Specifically, in small-sized DC motor 1, for (BH) max (ceiling capacity product) of making the field magnet 43 that influences motor performance to a great extent with constitute the optimization that concerns between the outside dimension of armature winding profile member 38 of magnetic part of rotating element, one of following two conditions or all are set:
(1) ratio of the width L2 of magnet and width L1 is arranged on condition in 2.0≤L2/L1≤3.0 scopes; And
(2) ratio of the radius of the turning R of magnet and inside radius is arranged in 65% to 85% the scope.
By adopting this structure, can increase the effective flux of armature winding profile member 38, and then can increase the winding zone of armature winding profile member 38, and can suppress quantity as the field magnet that will be used 43 of motor element costliness, therefore improved the torque that will produce, reduce motor size simultaneously, thereby reduced the cost and the volume of motor.
As mentioned above, can change the structure of motor frame 30 and field magnet 43 by different way.
In the centreless motor of embodiment 3, because the external diameter of armature winding profile member 38 is set with respect to the internal diameter of the barrel 31 of motor frame 30, thereby at the external diameter of armature winding profile member 38 near the position of the internal diameter of barrel 31, promptly, under the situation of present embodiment in the position of the center on each limit 44, the required minimal air gap G of field magnet 43 and required minimum widith L1 are set between barrel 31 and armature winding profile member 38, so, can improve the radical length of armature winding profile member 38, therefore, can improve winding space, thereby can make the diameter of armature winding profile member 38 maximize to improve starting torque, make the minimum number of the field magnet 43 of the costliness that will use simultaneously, can reduce the size of motor thus.
In addition, since the quantity that the shape of the barrel 31 of motor frame 30 forms its coupling part 45 with the magnetization of field magnet 43 the identical quadrangle of number of magnetic poles, so, can under the situation of the thickness of the core of the magnetic pole of the field magnet 43 that does not reduce to have realized sine curve magnetic, reduce the size of motor.
In addition, because the shape of commutator mould 37 comprises the barrel 37a that is provided with in the mode around the bearing pedestal part 33 of motor frame 30, the inner ring plate part 37b that links to each other and be provided with and be fixed to axle 7 with the end of barrel 37a, and be arranged on outer ring plate part 37c on the other end of barrel 37a in the mode of radially outwards protruding from the other end of barrel 37a, can be in the attaching space that guarantees between commutator segment 39a and the brush 40 make two bearings 34 for stable support, 35 are provided with this two bearings 34 in the mode that is separated from each other, 35, thus the barrel 42a of yoke 42 forms very longly in the axial direction in making.
Can on the outer surface of outer ring plate part 37c and armature winding profile member 38, the resin reinforced membrane be set, thereby constitute shockproof structure.Tap 38a and rise piece 39b are connected by welding to together.Tap 38a is bar shaped, and bending section is set so that give elastic force on its part.
Because field magnet 43 and interior yoke 42 are set to simultaneously armature winding profile member 38 is arranged between them toward each other, so can be provided with the magnetic circuit (interior yoke 42 etc.) of magnetic material very long, and the magnetic resistance of magnetic circuit can be suppressed to be very low level, descend thereby can suppress magnetic flux density.In addition, needless to say be to suppress cogging torque.
(embodiment 4)
Fig. 7 A and 7B show the profile that the slotless of having used magnetic arrangement architecture of the present invention has the core motor.
Fig. 7 A is the profile of the line p-p in Fig. 7 B, and Fig. 7 B is the transverse cross-sectional view of the line o-o in Fig. 7 A.The slotless of present embodiment has the core motor to be also included within the small-sized DC motor of the present invention.
Slotless of the present invention has core motor 47 to constitute, and has replaced the interior yoke 42 of the centreless motor described in the embodiment 3, in the mode of the inboard of contact armature winding profile member 38 mobile background yoke 46 is set, and mobile background yoke 46 is supported by commutator mould 37.Mobile background yoke 46 is made by resin of having sneaked into magnetic material or magnetic material, and it does not have groove, and for being similar to the tubular of armature winding profile member 38.
Be configured to have four magnetic poles as field magnet 43 among the embodiment 3, and comprise a pair of N utmost point magnet 43MNL and S utmost point magnet 43MSL and a pair of N utmost point magnet 43MNS and S utmost point magnet 43MSS.This embodiment is characterised in that and utilizes a pair of N utmost point magnet with identical magnetic flux density and S utmost point magnet as a unit.Magnet with different magnetic flux densities capable of being combined.Arrange magnet, make them arrange with homodisperse angle with respect to the center of axle (rotating shaft) 7.
For example, in order to indicate the magnetic flux permeation pathway, the magnetic flux that produces from the field magnet 43MNL with N utmost point is via by armature winding profile member 38, mobile background yoke 46, armature winding profile member 38, the field magnet 43MSL with S utmost point and motor frame 30 tactic paths infiltrations.Because the position that magnetic resistance uprises only along the magnet NML in this path and the air gap between magnet MSL and the armature winding profile member 38, can have big magnetic flux density and big torque for comparing with the centreless motor among the embodiment 3 with the motor structure.
In addition, because mobile background yoke 46 is arranged on armature winding profile member 38 inboards, compare with the centreless motor among the embodiment 3, it is very big that inertia force becomes, and level and smooth rotation is provided.
Although when embodiment is applied to inner rotor motor, described embodiment, but, one is being arranged on the motor frame, in this motor frame, be provided with field magnet, under the situation of winding is fixed on the motor frame and drive current is flowed through these windings, the present invention also can be constructed to outer rotor motor.In addition, under the situation of the axle that external power source is used to rotate, the present invention also can be constructed to oscillator.
Under the situation that does not change function, can differently make up described up to now structure in mode suitably.
Allow both sideway swivels in the magnet of arranging with predetermined dispersion angle of armature component, sideway swivel outside it again.
Except described embodiment up to now, can construct small-sized DC motor in conjunction with absolute construction with any performance.
The present invention requires the foreign priority of Japanese patent application of submitting on May 27th, 2005 (JP2005-156248) and the Japanese patent application of submitting on December 1st, 2005 (JP2005-348016), and their content is hereby incorporated by reference.
Claims (9)
1. small-sized DC motor comprises:
Motor frame, described motor frame comprises a barrel, described barrel has constant thickness and has the cross section of the shape that comprises four limits and arc coupling part, each arc coupling part is in described four limits between the adjacent both sides, and adjacent both sides are coupled together, and each arc coupling part is positioned at the inboard of the tetragonal respective corners that comprises described four limits; And
Magnet, it is attached to the inner surface of motor frame, and the magnet inboard has circumferential surface and its outside and contacting that described motor frame matches, and this magnet has arch section in the part corresponding with the arc coupling part of motor frame,
Wherein, the radius of the circumferential surface of the radius of each arch section of described magnet and described magnet is proportional.
2. small-sized DC motor as claimed in claim 1, wherein, described magnet is included in the part that alternately is magnetized to different magnetic poles on the direction of circumferential surface.
3. small-sized DC motor as claimed in claim 2, wherein, the part that is magnetized to different magnetic poles is separated from each other.
4. small-sized DC motor as claimed in claim 2, wherein, the part that is magnetized to different magnetic poles contacts with one of arc coupling part of described motor frame.
5. small-sized DC motor as claimed in claim 1, the footpath of wherein said magnet make progress the ratio ranges of minimum widith and Breadth Maximum for from 1: 2 to 1: 3.
6. small-sized DC motor as claimed in claim 1, wherein, the radius of each arch section of described magnet is from 65% to 85% with the scope of the ratio of the radius of the circumferential surface of described magnet.
7. small-sized DC motor as claimed in claim 1, it comprises the armature component that is placed in rotatably in the described motor frame, wherein, described armature component comprises: by the armature winding profile member of the tubular coil of magnet-wire coiled; And interior yoke, it comprises the barrel of fixing with in the face of the mode of described armature winding profile member.
8. small-sized DC motor as claimed in claim 1, it comprises the armature component that is placed in rotatably in the described motor frame, wherein, described armature component comprises: by the armature winding profile member of the tubular coil of magnet-wire coiled; And tubular mobile background yoke, the interior side contacts of itself and described armature winding profile member.
9. small-sized DC motor as claimed in claim 1, the arc coupling part of wherein said motor frame have constituted the part with the circumference of the centres of axle.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005156248 | 2005-05-27 | ||
| JP2005156248 | 2005-05-27 | ||
| JP2005348016 | 2005-12-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1870398A CN1870398A (en) | 2006-11-29 |
| CN100576702C true CN100576702C (en) | 2009-12-30 |
Family
ID=37443979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200610092439A Active CN100576702C (en) | 2005-05-27 | 2006-05-29 | Small-sized DC motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100576702C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109891710A (en) * | 2016-10-06 | 2019-06-14 | 博泽沃尔兹堡汽车零部件有限公司 | Sectional magnet and permanent magnet motor including sectional magnet |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5101930B2 (en) * | 2007-06-08 | 2012-12-19 | マブチモーター株式会社 | Small motor with polygonal outline |
| CN101673973B (en) * | 2008-09-08 | 2013-04-24 | 德昌电机(深圳)有限公司 | Motor |
| PL2166647T3 (en) | 2008-09-19 | 2018-09-28 | Abb Schweiz Ag | Self-ventilated traction motor |
| CN102044933B (en) * | 2009-10-19 | 2014-11-05 | 德昌电机(深圳)有限公司 | Vehicle window lifting device and permanent magnet motor thereof |
| JP2011004569A (en) | 2009-06-22 | 2011-01-06 | Mabuchi Motor Co Ltd | Motor |
| CN102594027A (en) * | 2011-01-14 | 2012-07-18 | 捷贸电机工业股份有限公司 | Motor with attaching position detection and bidirectional power output function |
-
2006
- 2006-05-29 CN CN200610092439A patent/CN100576702C/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109891710A (en) * | 2016-10-06 | 2019-06-14 | 博泽沃尔兹堡汽车零部件有限公司 | Sectional magnet and permanent magnet motor including sectional magnet |
| CN109891710B (en) * | 2016-10-06 | 2021-09-14 | 博泽沃尔兹堡汽车零部件有限公司 | Segmented magnet and permanent magnet motor including the same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1870398A (en) | 2006-11-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20220376594A1 (en) | Motor | |
| CN100576702C (en) | Small-sized DC motor | |
| US7498706B2 (en) | Small DC motor | |
| US7701093B2 (en) | Linear motor | |
| CN100541976C (en) | Small-sized DC motor | |
| US6507136B1 (en) | Eccentric commutator for vibrator motor | |
| JP2016208569A (en) | Rotor for rotary electric machine | |
| GB2281819A (en) | Locating and securing commutator segments | |
| US8299675B2 (en) | Brushless DC motor and stator thereof | |
| US20220311294A1 (en) | Rotor with arcuate magnets | |
| US20170279318A1 (en) | Rotary electrical machine with a ratio of dimensions which minimises the torque undulations | |
| US20170279320A1 (en) | Rotary electrical machine with a configuration which minimises the torque undulations | |
| CN212519424U (en) | Screen vibration sound production device | |
| JP6461293B2 (en) | Electric motor and its motor shaft | |
| KR20080058572A (en) | Stator core shape of transverse flux linear motor reducing the simple winding and small volume | |
| EP3629448A1 (en) | Rotor and motor | |
| CN103023161B (en) | Core free motor, vibrating motor and mobile terminal apparatus | |
| JP2021005969A (en) | motor | |
| JP2016105699A (en) | PM type stepping motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |