CN101252305A - Vibrating-type motor - Google Patents
Vibrating-type motor Download PDFInfo
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- CN101252305A CN101252305A CNA2008100057790A CN200810005779A CN101252305A CN 101252305 A CN101252305 A CN 101252305A CN A2008100057790 A CNA2008100057790 A CN A2008100057790A CN 200810005779 A CN200810005779 A CN 200810005779A CN 101252305 A CN101252305 A CN 101252305A
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Abstract
A vibrating-type motor is provided, in which a restoring force is reduced without reducing a thrust increasing effect by auxiliary magnets, thereby to reduce the size and expense of the motor while increasing efficiency. The vibrating-type motor includes a moving part having a main magnet and auxiliary magnets individually junctioned coaxially to two axial end portions of the main magnet, an exciting yoke including two leg portions opposed to the moving part through a gap and arranged coaxially with the moving part, an exciting coil wound on the exciting yoke for generating a magnetic flux in the leg portions, and a back yoke arranged to confront the exciting yoke with the moving part located between the back yoke and the exciting yoke, wherein outer-side end portions of the exciting yoke extend past axial end portions of the back yoke.
Description
Technical field
The present invention relates to vibrating-type motor, can use it for for example vibration-type compressor of Stirling (Stirling) refrigerator.
Background technology
Usually moving-magnetic linear motor (hereafter is " a moving-magnetic type electric machine ") is used as vibrating-type motor.Figure 4 and 5 are schematic diagrames of explaining the drive principle of moving-magnetic type electric machine, and illustrate along the part in the cross section that the central shaft C that is columniform motor substantially intercepts.As shown in Figure 4, motor comprises excitation yoke 101, magnet exciting coil 102, back of the body yoke 103 and moving component 104.Moving component 104 is made by the cylindrical permanent magnet in the gap portion that is arranged between excitation yoke 101 and the back of the body yoke 103 and is different with the magnetic pole on the outer circumferential sides in inner circumferential side.Also show the magnetic flux 201 that generates by moving component 104.The conventional shell that is used for support motion parts 104 is provided, but not shown.
Shown in most of moving-magnetic type electric machines in, the single permanent magnet with a magnetization one pole is as moving component 104, this moving component 104 integrally is connected to the piston (not shown).Moving component 104 has two shaft end in the strut width (leg width) that is limited in excitation yoke 101.Be magnetized into the N utmost point and its inner circumferential side is magnetized under the situation of the S utmost point at the excircle of moving component 104, as shown in Figure 4, the magnetic flux 201 that generates from outer circumferential sides returns inner circumferential side around the outside of moving component 104.Therefore, at two shaft ends of moving component 104, above-mentioned magnetic flux 201 be equivalent to the magnetic flux that generates during the feed-in electric current on the contrary perpendicular to the direction of accompanying drawing.This magnetic flux is called as the equivalent current I of permanent magnet
M
When magnetic flux phi when the current fed magnet exciting coil 102 of AC generated, and work as this magnetic flux phi and be linked to and wherein have equivalent current I
MClearance G the time, as shown in Figure 5, be arranged in moving component 104 in the clearance G according to Fleming (Fleming) left hand rule by along power horizontal in the accompanying drawing (thrust) reciprocating motion.Can calculate above-mentioned thrust F simply according to following equation 1:
F＝B·2I
M·L
M
Wherein letter b is indicated the magnetic flux density of the magnetic flux phi that generates in the clearance G, and L
M Indication moving component 104 is in the average length of circumferencial direction.In equation 1, different with common BIL rule, equivalent current I
MDouble because in this model equivalent electric current I
MBe present in two parts of two shaft ends of moving component 104.
On the other hand, moving component 104 is provided with mechanical spring (for example, helical spring or flat spring), and this mechanical spring has along unshowned axial suitable elastic force (shown in JP-A-2005-9397).This is because can suppress input power in the resonance point place of mechanical oscillation drive motion components 104.Generally speaking, stirling cooler moves with 40 to 80Hz low relatively frequency.The natural frequency f of simple spring mass system is provided by following equation 2 at elastic constant k and moving-mass m:
f＝1/2”“k/m
In addition, vibrating-type motor of the present invention is being used as under the situation of compressor, elastic constant k is expressed by following equation 3:
k＝k
sp+k
mag+k
gas，
Wherein:
k
SpIndication is according to the elastic constant of mechanical spring;
k
MagIndication is according to the elastic constant of the restoring force of moving component magnet; And
k
GasIndication is according to the elastic constant of Compressed Gas.
For these elastic constants, elastic constant k
GasBasically recently determine by the blowing pressure and the compression of Compressed Gas according to required freezing output, thereby be difficult to regulated at will.As shown in Figure 4 and Figure 5, be to have under the situation of the single permanent magnet that magnetizes one pole at moving component 104, the restoring force of magnet is difficult in the range of movement and works, thereby does not in fact need to consider constant k
MagAs a result, mechanical elasticity constant k
SpHave wide adjustable extent, make that its design is relatively easy.
In addition, for (L under the situation that does not change motor body
M=constant) increases thrust F,, can increase the magnetic flux density B and the equivalent current I in gap as conspicuous from Fig. 1 institute
MAt first, in order to increase magnetic flux density B, must reduce the gap length in gap or the exciting current that magnet exciting coil 102 is flow through in increase.Yet the problem of last method is that moving component 104 and supporting member thereof are made very thin, and this is easy to cause the reduction of intensity and the rising of manufacturing cost, and then the problem of a method is Joule heat loss (I
2R) increase, cause decreased performance thus.
On the other hand, in order to increase equivalent current I
M, can not only change thickness, and adopt permanent magnet with stronger magnetic force as the permanent magnet of moving component 104.Yet these options will improve manufacturing expense.
The method of another kind of increase thrust F is shown in Figure 6.In the example of this moving-magnetic type electric machine,, made to form moving component 104A by coaxial and integrally be connected to two shaft ends of cylindrical main magnet 105 along the magnetized cylindrical auxiliary magnet 106 of direction opposite and 107 to increase equivalent current I actually with main magnet 105
MFor example, U.S. Patent No. 5,148,066 and 4,937,481 illustrate and comprise that the moving component with main magnet and a pair of auxiliary magnet is known.In example shown in Figure 6, under excited state not, the coupling part magnetic flux between main magnet 105 and auxiliary magnet 106 and 107 cancels each other out, and makes the confining force of moving component 104A in the neutral position become stronger than the structure of Fig. 4 and Figure 10.The advantage of this acquisition is to have promoted so-called " self-centering ".
Fig. 7 is a U.S. Patent No. 5,148, the schematic diagram of the moving-magnetic type electric machine of describing in 066.Motor shown in Fig. 7 comprises back of the body yoke 201, magnet exciting coil 202, excitation yoke 203, moving component 204, main magnet 205, auxiliary magnet 206 and 207.Motor is coupled to the Stirling engine 300 that is positioned at shell 301 via piston 302.Displacer 303 also is positioned within the shell 301.Neutral position 210 is specified and is used for moving component 204.Under the situation that moving component 204 axially moves, according to prior art shown in Figure 7, strong restoring force acts on the moving component 204.As a result, may not keep piston stroke fully.
As the countermeasure that reduces above-mentioned restoring force, U.S. Patent No. 5,148 discloses among Fig. 7 A in 066 and the 8A by auxiliary magnet being formed triangle or the method for its attenuate being changed shape and structure.For these shaped design are become optimal value, parameter is increased the feasible auxiliary magnet that is difficult to design.In addition, if adopt to form method such as triangle auxiliary magnet, then equivalent current reduces and produces that not only restoring force reduces but also thrust increases the problem that effect reduces.
On the other hand, under the situation that does not adopt the countermeasure that reduces restoring force, strong restoring force acts on main magnet and the auxiliary magnet.This feasible essential constant k of considering by equation 3 expression
MagAlong with constant k
MagIncrease, what obviously easily see from equation 2 and equation 3 is that the design mechanical spring narrows down with the required scope of resonance of regulating mechanical oscillation, makes the design of low-frequency resonance become difficult.
In this case, also can expect reducing the radially confining force of support spring (or mechanical spring), thereby weaken whole elastic force, or the moving-mass in the increase equation 2.Yet these countermeasures still have problem: piston and cylinder can not support in non-contacting mode, and total is heavy and huge.
In view of above-mentioned, expectation provides a kind of vibrating-type motor, wherein only reduces restoring force by auxiliary magnet under the situation that does not reduce thrust increase effect, increases efficient simultaneously thereby reduce size.
Summary of the invention
The invention provides a kind of vibrating-type motor, wherein under the situation that does not reduce thrust increase effect, only reduce restoring force, increase efficient simultaneously thereby reduce size by auxiliary magnet.Particularly, provide a kind of vibrating-type motor, it comprises: have main magnet and respectively at the moving component of the auxiliary magnet of the coaxial shaft end that is connected to main magnet of link position; The excitation yoke, this excitation yoke comprises by gap two leg portion relative with moving component, and arrange this excitation yoke with respect to moving component, make on two leg portion that first distance between the core of the face of close moving component is different with the second distance between the link position; Magnet exciting coil, this magnet exciting coil are wrapped on the excitation yoke and are used for generating magnetic flux in leg portion; And back of the body yoke, this back of the body yoke is arranged in the face of the excitation yoke, and moving component is between back of the body yoke and excitation yoke; Wherein the shaft end of moving component coincide with the outboard end of the face of leg portion basically.
The excitation yoke is arranged on the radial outside of moving component, and will carries on the back the radially inner side that yoke is arranged on moving component.Perhaps, the excitation yoke is arranged on the radially inner side of moving component, and will carries on the back the radial outside that yoke is arranged on moving component.
In a preferred embodiment, the second distance between the link position is greater than first distance between the core of the face of close moving component on two leg portion, and the shaft length of moving component is greater than first distance.
According to the present invention, a kind of vibrating-type motor can be provided, it can reduce the restoring force that the permanent magnet by moving component causes, simultaneously basic maintenance can be in addition by the thrust of the moving component of exciting current generation, and this vibrating-type motor size is little, in light weight, price is low.
Other features and advantages of the present invention can become apparent from the detailed description of following the preferred embodiments of the present invention.
Description of drawings
To the present invention be described with reference to some preferred embodiments and drawings of the present invention, in the accompanying drawing:
Fig. 1 is the schematic diagram that illustrates according to vibrating-type motor of the present invention;
Fig. 2 is illustrated in the displacement of moving component under the situation that the position relation between the coupling part of the core of leg portion and moving component moves and the graph of a relation between the restoring force;
Fig. 3 is illustrated in the displacement of the moving component of embodiment under the situation that the position relation between the coupling part of the core 11b of leg portion and 12b and moving component moves and the graph of a relation between the net thrust;
Fig. 4 is the schematic diagram of drive principle that is used for the moving-magnetic type electric machine of interpretation routine;
Fig. 5 is the schematic diagram of drive principle that is used for the moving-magnetic type electric machine of interpretation routine;
Fig. 6 is the schematic diagram that conventional electric motor structure is shown; And
Fig. 7 is the schematic diagram that conventional electric motor structure is shown.
Embodiment
Fig. 1 is the schematic diagram that illustrates according to vibrating-type motor of the present invention.Discuss as above Fig. 6 to 9, Fig. 1 illustrates along the part in the cross section that the central shaft C that is cylindrical motor substantially intercepts.Fig. 1 illustrates a kind of motor, and it comprises excitation yoke 1, is wrapped in magnet exciting coil 2, back of the body yoke 3 and moving component 4 on the excitation yoke 1.Moving component 4 is formed by the permanent magnet in the yoke gap portion that is arranged between excitation yoke 1 and the back of the body yoke 3.The not shown in the accompanying drawings framework that is used for the routine of support motion parts 4.
As shown in Figure 1, come tectonic movement parts 4 by diaxon end auxiliary magnet 6 and 7 is coaxial at link position 8,9 and that integrally be connected to main magnet 5, it is the N utmost point and its inner circumferential side is the S utmost point that wherein main magnet 5 makes its outer circumferential sides. Auxiliary magnet 6 and 7 is along the direction magnetization opposite with main magnet 5.Main magnet 5 and auxiliary magnet 6 and 7 preferably are made of the rare earth element such as neodymium or samarium.
As shown in Figure 1, the face 11f of close moving component and core 11b and the 12b of 12f have width W on the leg portion 11 and 12.Back of the body end 3a of yoke 3 and 3b basically with leg portion 11 and 12 on the face 11f of the most close moving component 4 and outboard end 11a and the 12a of 12f coincide.In brief, the shaft length of back of the body yoke 3 equals the distance between outboard end 11a and the 12a.In addition, link position 8 and 9 and the core 11b of leg portion 11 and 12 and 12b relative to each other move vertically.On the other hand, the distance between the distance between the link position 8 and 9 and core 11b and the 12b is different.
Fig. 2 illustrates displacement of (neutrality among Fig. 2) moving component 4 under two kinds of situations and the relation between the restoring force, coincide comprising the core 11b of the leg portion 11 of excitation yoke 1 and 12 and position and the link position 8 and 9 of 12b, and the position of core 11b and 12b moves inward 1.5mm.Similar with Fig. 2, Fig. 3 illustrates displacement of (neutrality among Fig. 3) moving component 4 under two kinds of situations and the relation between the net thrust, coincide comprising the core 11b of the leg portion 11 of excitation yoke 1 and 12 and position and the link position 8 and 9 of 12b, and the position of core 11b and 12b moves inward 1.5mm.
Under the situation that has auxiliary magnet 6 and 7, can understand the motion stabilization increase of restoring force from Fig. 2 along with moving component 4.Simultaneously, as shown in Figure 3, net thrust is along with the motion stabilization of moving component 4 reduces.Net thrust is represented by power that generates in moving component 4 by exciting current and synthetic the making a concerted effort of restoring force.Under " neutrality " situation of Fig. 2 and Fig. 3, it is very strong to understand restoring force from slope of a curve, and net thrust extremely reduces.In brief, " neutrality " situation represents that the range of movement of moving component 4 is narrow.
On the other hand, under the situation of bias internal 1.5mm, the slope of a curve of restoring force and net thrust is than the mitigation of neutral condition in the position of core 11b and 12b.In brief, can reduce the restoring force of moving component 4, and net thrust is very strong and reduce by its degree of successively decreasing.Particularly, move vertically to the inside with respect to link position 8 and 9 position of core 11b and 12b.Although should be understood that auxiliary magnet 6 is identical with the condition of neutral condition with shape with 7 thickness, can by being installed, auxiliary magnet 6 and 7 thrusts that obtain increase under the situation of effect drive motion components 4 in wide region in deterioration not.
With reference to some preferred embodiment of the present invention the present invention has been described.Yet the modification that should understand within the scope of the appended claims is possible.For example, in an illustrated embodiment, excitation yoke 1 is arranged at the radial outside of moving component 4, and back of the body yoke 3 is arranged at the radially inner side of moving component 4.Yet, the arrangement that can put upside down excitation yoke 1 and back of the body yoke 3.In addition, vibrating-type motor according to the present invention can be applied to the vibration-type compressor etc. of stirling cooler.
Claims (5)
1. vibrating-type motor comprises:
Moving component, described moving component comprise main magnet and respectively at the coaxial auxiliary magnet that is connected to the shaft end of described main magnet of link position;
The excitation yoke, described excitation yoke comprises by gap two leg portion relative with described moving component, and arrange described excitation yoke with respect to described moving component, make on described two leg portion that first distance between the core of the face of close described moving component is different with the second distance between the described link position;
Magnet exciting coil, described magnet exciting coil are wrapped on the described excitation yoke and are used for generating magnetic flux in described leg portion; And
Back of the body yoke, described back of the body yoke is arranged in the face of described excitation yoke, and described moving component is between described back of the body yoke and described excitation yoke;
The shaft end of wherein said moving component coincide with the outboard end of the face of described leg portion basically.
2. vibrating-type motor as claimed in claim 1 is characterized in that, described excitation yoke is arranged on the radial outside of described moving component, and described back of the body yoke is arranged on the radially inner side of described moving component.
3. vibrating-type motor as claimed in claim 1 is characterized in that, described excitation yoke is arranged on the radially inner side of described moving component, and described back of the body yoke is arranged on the radial outside of described moving component.
4. vibrating-type motor as claimed in claim 1 is characterized in that, described second distance is greater than described first distance.
5. vibrating-type motor as claimed in claim 1 is characterized in that, the shaft length of described moving component is greater than described first distance.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007040998 | 2007-02-21 | ||
| JP2007040998A JP4962040B2 (en) | 2007-02-21 | 2007-02-21 | Vibration type motor |
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| Publication Number | Publication Date |
|---|---|
| CN101252305A true CN101252305A (en) | 2008-08-27 |
Family
ID=39783229
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100057790A Pending CN101252305A (en) | 2007-02-21 | 2008-02-01 | Vibrating-type motor |
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| Country | Link |
|---|---|
| JP (1) | JP4962040B2 (en) |
| CN (1) | CN101252305A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102025253A (en) * | 2009-09-15 | 2011-04-20 | 台达电子工业股份有限公司 | Magnetic vibrator |
| CN102265489A (en) * | 2008-11-04 | 2011-11-30 | 圣波尔股份有限公司 | Multiple armature linear motor/alternator having magnetic spring with no fringe fields and increased power output |
| US8912692B2 (en) | 2009-09-02 | 2014-12-16 | Delta Electronics, Inc. | Magnetic vibrator with inclined pole pieces |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009065754A (en) * | 2007-09-05 | 2009-03-26 | Fuji Electric Systems Co Ltd | Vibrating-type motor |
| JP2009065755A (en) * | 2007-09-05 | 2009-03-26 | Fuji Electric Systems Co Ltd | Vibrating-type motor and vibrating-type compressor using the same |
| KR101063507B1 (en) | 2009-10-16 | 2011-09-08 | 한국기술교육대학교 산학협력단 | Low Frequency Inertial Force Module |
| CN113866265A (en) * | 2021-08-20 | 2021-12-31 | 北京工业大学 | Electromagnet type transverse wave electromagnetic acoustic transducer |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3873836B2 (en) * | 2002-07-23 | 2007-01-31 | 神鋼電機株式会社 | Linear actuator |
| WO2007013505A1 (en) * | 2005-07-29 | 2007-02-01 | Mitsubishi Materials Pmg Corporation | Reciprocating cycle engine |
-
2007
- 2007-02-21 JP JP2007040998A patent/JP4962040B2/en active Active
-
2008
- 2008-02-01 CN CNA2008100057790A patent/CN101252305A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102265489A (en) * | 2008-11-04 | 2011-11-30 | 圣波尔股份有限公司 | Multiple armature linear motor/alternator having magnetic spring with no fringe fields and increased power output |
| CN102265489B (en) * | 2008-11-04 | 2013-12-25 | 圣波尔股份有限公司 | Multiple armature linear motor/alternator having magnetic spring with no fringe fields and increased power output |
| US8912692B2 (en) | 2009-09-02 | 2014-12-16 | Delta Electronics, Inc. | Magnetic vibrator with inclined pole pieces |
| CN102025253A (en) * | 2009-09-15 | 2011-04-20 | 台达电子工业股份有限公司 | Magnetic vibrator |
| CN102025253B (en) * | 2009-09-15 | 2013-11-13 | 台达电子工业股份有限公司 | Magnetic vibrator |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4962040B2 (en) | 2012-06-27 |
| JP2008206344A (en) | 2008-09-04 |
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Owner name: FUJI ELECTRIC CO., LTD. Free format text: FORMER OWNER: FUJI ELECTRIC SYSTEMS CO., LTD. Effective date: 20110921 |
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Application publication date: 20080827 |