CN100358219C - Stator core for linear motor - Google Patents
Stator core for linear motor Download PDFInfo
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- CN100358219C CN100358219C CNB2004800096579A CN200480009657A CN100358219C CN 100358219 C CN100358219 C CN 100358219C CN B2004800096579 A CNB2004800096579 A CN B2004800096579A CN 200480009657 A CN200480009657 A CN 200480009657A CN 100358219 C CN100358219 C CN 100358219C
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- stator core
- stator component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/145—Stator cores with salient poles having an annular coil, e.g. of the claw-pole type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
- H02K33/16—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with polarised armatures moving in alternate directions by reversal or energisation of a single coil system
Abstract
A linear motor comprising a stator core and/or a mover. The stator core of said linear motor comprising an inner perimeter, an outer perimeter essentially encircling the inner perimeter, a first and a second tooth being arranged along one of the inner perimeter or the outer perimeter, a slot for receiving a stator coil, said slot being a cavity arranged within the stator core, wherein said stator core is divided into a first stator part and a second stator part, said first stator part including the first tooth, being arranged to partially define the slot, and being made of soft magnetic powder, and said second stator part including the second tooth, being arranged to partially define the slot, and being made of soft magnetic powder.
Description
Technical field
The present invention relates to linear motor, be specifically related to the stator core of linear motor, linear motor and the mover of linear motor.
Background technology
Usually, for example iron or electrical steel insulating thin are made by soft magnetic material to be also referred to as soft magnetic part unshakable in one's determination in motor and the machine.These soft electrical material insulating thins are also referred to as lamination.Iron core is made by lamination, so that reduce the appearance of vortex flow, thereby improves the efficient of motor and machine.
In linear motor with annular stator iron core and tubulose mover, wherein mover is the parts that will be moved by the magnetic field interaction with stator in the linear motor, each metallic plate is arranged in the radial and axial plane so that vortex flow influence minimum.
In some linear motors, the metallic plate formation core portion that is stacked abreast, this part is arranged so that a metallic plate is positioned at radial and axial plane, and other metallic plate is parallel with this metallic plate.
A problem of the stator core of making as mentioned above is that coil must be wrapped in the groove of stator core.This opening at this groove especially bothers when being arranged on the inner circumferential surface of stator core.
In addition, at the ratio of the total spatial of power that produces and linear motor, promptly the power of Chan Shenging/spatial volume aspect adopts the straight line electric engine efficiency of above-mentioned technology not high.
Therefore, need linear motor to produce certain power but spatial volume is less, and the stator that needs easier equipment coil.
In US 6 060 810, a kind of stator that is used for linear motor has been proposed, described stator has staggered core lamination.This stator comprises and is wound in columnar stator coil, and the L shaped laminated sheet with a horizontal assembly and a vertical component.A plurality of laminated sheets of horizontal assembly replace stacked formation on upper surface and lower surface radial, thereby form cylindrical shape.
When making up such stator, do not need coil to be wrapped in the groove of stator core by opening.But, this stator core is structured in more complicated on the coil.
In addition, aspect the ratio of the spatial volume of power that produces and motor, still not high enough according to the efficient of the stator core of US 6 060 810.
Summary of the invention
The purpose of this invention is to provide the method that is used to improve linear motor.
This purpose can utilize hereinafter described stator core and linear motor to realize.And the preferred embodiments of the present invention are hereinafter also disclosed.
Particularly, according to an aspect of the present invention, the stator core that is used for linear motor comprises: inner rim; The basic neighboring that surrounds this inner rim; First and second teeth that are provided with along one of this inner rim or this neighboring; And the groove that is used to admit stator coil, described groove is arranged on the cavity in the stator core, and wherein: described stator core is divided into first stator component and second stator component; Described first stator component comprises first tooth, and is arranged to part and limits this groove, and is made by soft magnet powder; Described second stator component comprises second tooth, and is arranged to part and limits this groove, and is made by soft magnet powder.
By stator core being divided into two stator components that respectively comprise a tooth, can help coil arrangement in stator core, this is because can easily coil be arranged in first stator component when separating stator component, can easily second stator component is arranged to closely contact so that form stator or stationary part with first stator component then.This embodiment allows to use the coil that twines in advance, and the coil that this can be twined in advance when stator core is separated as the present invention is indicated is easily positioned in the stator core.Therefore, help the manufacturing of stator.
In addition, by making stator component,, also can easily produce this stator component, and stator component can be done firmly even then stator component will form complicated shape with soft magnet powder.In addition, where necessary, the stator component of being made by soft magnet powder is easy to process accurately.Therefore, according to use soft magnet powder mentioned above and be divided into the assembling that two independent stator components can help stator.If two stator components all are isotropic bodies that soft magnet powder is made, then more help the stator assembling.
Another advantage of making stator component with soft magnet powder is, can improve the ratio of the total spatial of power that the motor that comprises this stator produces and described motor.Especially can increase the activity coefficient (occupation efficiency) of stator.This activity coefficient is defined as the spatial volume of active material (active material) and the ratio of total spatial.Its reason is soft magnet powder can form provides higher in whole stator core a magnetic flux magnetic permeability.Be arranged to the closely parts of contact owing to can form accurately, so even the neighboring edge that can cross over these parts higher magnetic flux magnetic permeability is provided.The lamination stator core only can provide high magnetic permeability in each laminated sheet, and when having the body of neighboring and inner rim with formation in laminated sheet will be arranged on radial and axial plane, will have the very big space that does not wherein have soft magnetic material.Described space is filled with low permeability substance for example air or certain packing material usually.But by making stator core with soft magnet powder, then magnetic flux is not limited to have " flux channels " of constant width, but can more freely flow (for laminated sheet, described width is corresponding to the thickness of each laminated sheet).Therefore, the more parts in the cumulative volume of stator can be used for transmitting magnetic flux, thereby can reach higher activity coefficient, that is, thereby the stator motor can be made lessly.
An embodiment according to stator, first tooth extends a segment distance towards second stator component vertically, described distance changes along one of the inner rim of stator core or neighboring, and second stator component extends a segment distance towards first stator component vertically, and described distance changes along one of the inner rim of stator core or neighboring.
Introduce described variation by tooth in the distance of extending vertically, can realize being similar to the effect of the skew (skew) in the turning motor along described circumferential diverse location place to each stator component.Therefore, can reduce to have the existence of the fluctuation in the linear motor of this kind stator design.According to the mover of the expection (use) of the motor that will be provided with this stator be to be arranged on stator the outside promptly on the neighboring of stator, or the inboard of stator can be arranged on tooth the neighboring or the inner rim place of this stator promptly on the inner rim of stator.
In one embodiment, first tooth is arranged to closely contact each other with second tooth.To such an extent as to closely the contact area of the enough little between cog of size of the radially extension of the tooth of contact can become magnetic saturation during operation.By making tooth be positioned to contact with each other, the assembly of these two stator components can be more stable, and is saturated during operation by making contact area, can keep lower via the magnetic leakage of this contact area.
According to another embodiment, described first stator component and described second stator component all comprise at least two parts being made by soft magnet powder, described at least two parts be arranged in the corresponding direction of the direction of described inner rim and neighboring on adjacent one another are.This embodiment helps the production of big stator.
According to an embodiment, the density of each stator component is at least 6500kg/m
3Can make that like this stator component has good magnetic performance when soft magnet powder makes stator component be easy to form.Especially, magnetic flux path needn't be a bidimensional as under the situation of laminated iron core.
According to another embodiment, the resistivity of each described stator component is at least 1 μ Ω m.Therefore, can reduce the negative effect that vortex flow is brought.
In one embodiment, in first stator component and second stator component each all is arranged in outer circumference and closely contacts each other, and separate at the inner rim place, the channel opening that leads in the described groove between first and second teeth of being separated to form at the inner rim place.This helps to arrange in such embodiments coil.
In an optional embodiment, in first stator component and second stator component each all is arranged in the inner rim place and closely contacts each other, and separate in outer circumference, at the channel opening that leads in the described groove between first and second teeth of being separated to form of outer circumference.
According to another aspect of the present invention, the mover that is used for linear motor comprises at least one soft magnetic material part and at least one permanent magnet, described at least one soft magnetic material part and described at least one permanent magnet mover axially on align, the polarization vector of wherein said at least one permanent magnet is axial.
In the context of the present invention, described axially is the moving direction of mover or stator, so to mover or stator, depend on that then which will move with respect to another among both.
Axially align with one of described at least one soft magnetic material part by described at least one permanent magnet with radial polarization vector is arranged to, can obtain firm mover.In addition, the manufacturing meeting of permanent magnet that can be used for this mover is easier, and this is because the axial length of this permanent magnet is littler than permanent magnet commonly used in the mover with the ratio of the width of permanent magnet.
In one embodiment, the soft magnetism of body part is made by soft magnet powder.Like this, help the manufacturing of soft magnetism part, and can increase the activity coefficient of mover.
In another embodiment, mover comprises at least two permanent magnets axially aligning along described, i.e. first permanent magnet and second permanent magnet, the distance between the axial centre of described at least two permanent magnets be expection (use) stator tooth pitch 0.75-1.5 doubly.By designing such mover, the efficient of this mover can be higher.
According to another embodiment, mover is a tubulose.
According to another embodiment, described at least one soft magnetic material partly has at least the first axial end of band edge face, and described at least one permanent magnet is arranged to contact with the whole end face of described first axial end substantially.According to this embodiment, the contact-making surface between described at least one soft magnetic material part and described at least one permanent magnet is very big, so mover can be more effective.
In one embodiment, described at least one permanent magnet is arranged to along circumference and axially extended surface and mover concordant of being arranged to towards expection (use) stator substantially with axially extended surface along circumference.
According to another aspect of the present invention, linear motor comprises any one stator core among the embodiment according to the said stator iron core.Therefore, this linear motor can have the advantage identical with the specific embodiment of stator core.
According to another embodiment of linear motor, linear motor also comprises any one mover among the embodiment according to above-mentioned mover.Therefore, this linear motor can have the advantage identical with the specific embodiment of mover.
According to another aspect of the present invention, the stator core that is used for linear motor comprises the annular stator iron core, wherein said annular stator iron core is divided at least two annular stator parts, i.e. first stator component and second stator component, and described stator component is the isotropic body of being made by soft magnet powder.
In the context of the present invention, annular stator iron core and stator component must not be circular, but can be Any shape.For example, annular stator is unshakable in one's determination and stator component can be triangle, square, rectangle, ellipse, be similar to the shape of numeral 8 etc.
Advantage in this respect of the present invention is, the annular stator iron core is divided into two annular stator parts can forms a kind of like this design, and this design helps to make this stator core as its a part of stator.In addition, high fill-factor can be easily made and be had in this stator core.
In an embodiment of this stator core, this stator core also comprises the groove that is used to admit stator coil, described groove is arranged on the cavity in this stator core, and wherein said slot part ground is limited by first stator component, and is partly limited by second stator component.
In another embodiment of stator core, first stator component comprises first tooth, and second stator component comprises second tooth, and described first and second teeth are provided with along one of the inner rim of annular stator iron core or neighboring.
In addition, this stator core can comprise the feature of previously described stator core.
From following detailed description, can be well understood to the other range of application of the present invention.But, should understand, represent the detailed description of the preferred embodiments of the present invention and specific example only as example, because from following detailed description, those skilled in the art can be well understood to various variations and change within the spirit and scope of the present invention.
Description of drawings
From the following detailed description of the embodiment of the present invention with reference to the accompanying drawings, can know the understanding other features and advantages of the present invention, in the accompanying drawing:
Fig. 1 a is the perspective view of linear motor according to an embodiment of the invention and stator core;
Fig. 1 b is the linear motor view vertically of Fig. 1 a;
Fig. 1 c is the viewgraph of cross-section of the linear motor of Fig. 1 a along the A-A line among Fig. 1 b;
Fig. 2 a is linear motor and a stator core view vertically according to another embodiment of the invention;
Fig. 2 b is the viewgraph of cross-section along the A-A line among Fig. 2 a;
Fig. 3 a is linear motor, a stator core and mover view vertically according to another embodiment of the invention;
Fig. 3 b is the viewgraph of cross-section along the A-A line among Fig. 3 a;
Fig. 4 a is linear motor, a stator core and mover view vertically according to another embodiment of the invention;
Fig. 4 b is the viewgraph of cross-section along the A-A line among Fig. 4 a;
Fig. 5 is the perspective view that comprises the stator core of two stator components according to an embodiment of the invention;
Fig. 6 is the viewgraph of cross-section corresponding to the stator core of the stator core of Fig. 5;
Fig. 7 a-c is the viewgraph of cross-section of stator core according to an embodiment of the invention, and other example that stator core is divided into two independent stator components is shown;
Fig. 8 and Fig. 9 are the perspective views that is divided into the stator component of several sections according to an embodiment of the invention;
Figure 10 is the viewgraph of cross-section of stator core according to an embodiment of the invention, and the design example that can introduce the effect that is similar to skew is shown;
Figure 11 is the viewgraph of cross-section of stator core according to an embodiment of the invention, and the example that tooth wherein is designed to contact with each other is shown;
Figure 12 is the viewgraph of cross-section that is used for the stator core of two stator coils according to an embodiment of the invention;
Figure 13 a is the perspective view of mover according to an embodiment of the invention;
Figure 13 b is the linear motor view vertically of Figure 13 a;
Figure 13 c is the viewgraph of cross-section of the mover of Figure 13 a along the A-A line of Figure 13 b;
Figure 14 is the perspective view of stator core according to an embodiment of the invention;
Figure 15 a is linear motor and a stator core view vertically according to another embodiment of the invention;
Figure 15 b is the viewgraph of cross-section along the A-A line of Figure 15 a.
Embodiment
In Fig. 1 a-c, the schematic diagram according to the linear motor of an embodiment is shown.Linear motor 10 comprises stator 12 and mover 14.Usually, stator is static and drive mover vertically, still, also can make mover static and make stator drive self vertically.Therefore, in the context of the present invention, axially be the moving direction of mover or stator, so extremely mover still is that stator depends on that then who will move with respect to another among both.
Stator comprises at least one coil 18a-c and at least one stator core 20a-c.Stator coil can be single winding, promptly be wound in coil and be connected single line on the unshowned power supply unit, or distributed winding, thereby promptly each stator coil comprises that the different delivery outlets that are connected to power supply unit also can transmit (a plurality of) line of the electric current with different electrical characteristics.The power supply unit of the known utilizable number of different types of motor technology those of skill in the art.Also known single winding or the distributed winding of how making of technical staff is connected with these power supply units.
The purpose of stator coil be produce will with the interactional magnetic flux of mover.Stator core 20a-c is arranged to closely near stator coil 18a-c, shown in the embodiment among Fig. 1 a-c, and stator coil 18a-c even can be sealed by stator core 20a-c substantially.
According to the embodiment among Fig. 1 a-c, each stator core 20a-c is divided into two stator component 21a-c and 22a-c.Each stator core 20a-c among Fig. 1 a-c, 2a-b and the 3a-b forms by one first stator component 21a-c and one second stator component 22a-c of piling up each other vertically.In linear motor as Figure 1-3 with a plurality of stator core 20a-c, be arranged to can be made into independent parts with the stator component of the close-connected stator of the stator component of another stator core, promptly, stator component 22a and 21b can be made into independent parts, stator component 22b and 21c can be made into independent parts, will be explained after a while.
The different designs that stator 20a-c is divided into different modes and the stator 20a-c of two stator component 21a-c and 22a-c will be described below.
Stator component 21a-c and 22a-c are made by the soft magnetic material with resistance, to reduce the appearance of vortex flow.In order to obtain resistance, the material of use can be the soft magnet powder of electric insulation, has the soft magnet powder of resistance or has the moldable soft magnetic material of resistance.When the soft magnet powder of using electric insulation, when having the soft magnet powder of resistance or having the moldable soft magnetic material of resistance, according to an embodiment, the stator component of manufacturing must have the resistivity that is at least 1 μ Ω m, so that reduce the appearance of vortex flow satisfactorily.In addition, in the stator of making by laminated sheet, may be difficult to obtain high activity coefficient, but this can utilize soft magnet powder to realize.According to an embodiment, each stator component is made for the homogeneous spare of a soft magnet powder.In this stator component, magnetic flux is not limited to the two-dimentional geometrical shape of laminate, but can utilize the 3D shape of stator component, so that reduce size can not causing under the saturated situation of stator core.According to an embodiment,, can or sinter required shape into the soft magnet powder compacting, as long as the stator component of gained has the resistivity that is at least 1 μ Ω m according to the soft magnetic material that uses.In addition, according to another embodiment, the density of stator component can be at least 6500kg/m
3Some examples that can be used for making by compacting the soft magnet powder of stator component are H gan s AB, S-263 83H gan s, the Somaloy 500 of Sweden, Somaloy 550 and Permite 75.
Usually, thus mover 14 is will move and can produce in the outside of linear motor 10 parts of actual effect with respect to stator in the linear motor.The magnetic field interaction that mover 14 and stator 12 produce, thus driven by stator 12.Mover 14 can comprise the pipe 26 that soft magnetic material is made.This soft magnetic material can be any in the quality and/or the type that above illustrate in conjunction with stator core 20a-c.In addition, on pipe 26, a plurality of magnetic tube 28a-d are installed.Each magnetic tube all is the permanent magnets with radial polarised vector, and promptly this permanent magnet magnetic pole is radially outside, and another magnetic pole of this permanent magnet is radially inside.For example, the magnetic tube 28a-c among Fig. 1 a-c can be provided with like this: the arctic of magnetic tube 28a outwards and the South Pole is inside, the South Pole of magnetic tube 28b outwards and the arctic is inside, the arctic of magnetic tube 28c outwards and the South Pole is inside, the South Pole of magnetic tube 28d is outwards and the arctic is inside.Magnetic tube 28a-d can be fastened on the pipe 26 by the known any method of those skilled in the art.
The axial length of mover can be different with the length shown in Fig. 1, and the quantity of magnetic tube also can be different.The quantity of the axial length of magnetic tube 28a-d and magnetic tube 28a-d can change, and can be depending on linear motor 10 and will be used for wherein application scenario.According to an embodiment, the axial length L of each magnetic tube 28a-d
mCan be the tooth pitch L between the center of two continuous teeth of stator
p0.75-1.5, i.e. L
m/ L
pRatio be 0.75-1.5.In the application's context, tooth pitch can be regarded the axial distance between the center line of two adjacent teeth as.
Another embodiment at linear motor shown in Fig. 2 a-b.This embodiment is similar to the embodiment of Fig. 1 a-c, and their difference hereinafter will be described.
The stator 12 of linear motor 10 comprises an optional feature, and promptly inner stator part 30.Inner stator part 30 can be such pipe: it is positioned at stator component 21a-c and 22a-c inside, and leaves the space between the inner rim of the neighboring of inner stator part 30 and stator component 21a-c and 22a-c.The effect of this inner stator part is the part as magnetic circuit, and stator component 21a-c and 22a-c also are the parts of this magnetic circuit.Inner stator part 30 can and use identical technology to make with the soft magnetic material identical with the remainder of stator mentioned above.Inner stator part is arranged to keep its position with respect to stator component 21a-c and 22a-c.
In addition, the design of mover is different with the mover of Fig. 1 a-c.Mover among the embodiment of Fig. 2 a-b is only made by magnetic tube 28a-d.With the same among the embodiment of Fig. 1 a-c, these magnetic tube also are permanent magnets, and they can be arranged to the direction of its polarization vector identical with the direction of the polarization vector of the permanent magnet shown in Fig. 1 a-c.Like this, this mover can be made into lighter than the mover among Fig. 1 a-c, and still, consequently mover can become more fragile, especially the junction between two magnetic tube 28a-d.Ratio L
m/ L
pCan with the embodiment shown in Fig. 1 a-c in identical.
Another embodiment at linear motor shown in Fig. 3 a-b.This embodiment also is similar to the embodiment of Fig. 1 a-c, and their difference hereinafter will be described.
In the embodiment of Fig. 1 a-c, 2a-b and 3a-b, the stator with three stator cores and three coils has been described.But the quantity of stator core and coil can be more or less.For example, the stator of Fig. 1 a-c can expand to and also have an additional stator core and corresponding stator coil.In addition, can reduce the quantity of stator coil by the stator coil of removing stator core 20a-c and correspondence in the linear motor from Fig. 1 a-c, 2a-b and 3a-b.
In Fig. 4 a-b, the linear motor with a stator coil 18 and a stator core 20 is shown.Mover among this figure is and the corresponding mover of mover of the linear motor shown in Fig. 3 a-b, hereinafter will be described in detail it.But this mover is any kind, for example wherein a kind of mover shown in Fig. 1 a-c and the 2a-b also.
Shown in Fig. 5 and 6 according to the stator core 20 of an embodiment.As mentioned above, stator core 20 is divided into two independent stator components, i.e. first stator component 21 and second stator component 22.Stator core 20 has inner rim 50, neighboring 52 and division surface 54.Inner rim should be understood that to limit the line of the inner boundary of stator core 20, and the neighboring should be understood that to limit the line of the external boundary of stator core 20.This stator core also can be described to have toroidal.Among the figure, neighboring 52 surrounds inner rim 50, and still, stator core 20 can comprise radially passes the breach that stator core 20 is extended, and still is considered to neighboring encirclement inner rim, surrounds inner rim at least substantially.Division surface 54 is the planes that stator core are divided into two stator components 21,22.
In addition, stator core 20 comprises at least two teeth, i.e. first tooth 56 and second tooth 58, and back core 60. Tooth 56 and 58 along inner rim 50 be provided with in case direct magnetic flux near mover.Back core 60 52 is provided with so that the magnetic flux path of high magnetic permeability is provided between first tooth 56 and second tooth 58 along the neighboring.In the embodiment shown in Fig. 5 and 6, each stator component 21 and 22 respectively comprises the part of a tooth 56,58 and back core 60.
Form is that the groove 62 of cavity is arranged in the stator core 20 so that admit stator coil.Thereby this groove is arranged between neighboring 52 and the inner rim, and is partly limited by first stator component 21, and part is limited by second stator component 22.Therefore, the shape of groove 62 also is an annular.
The tooth 56 and 58 of stator core 20 in axial direction extends relative to one another, leaves channel opening 64 between them.Channel opening 64 leads in the groove 62 of stator core 20.
The division surface 54 of stator core 20 can be arranged to axially towards stator core first surface 66 and in opposite direction axially towards the axial distance of second surface 68 of stator core equate.If tooth 56 is extending axially identical axial distance with 58 along inner rim, and division surface 54 is provided with as previously mentioned, and then these two stator components are identical, and can use a cover fabrication tool to produce.Therefore, the stator that is used to produce different stator components 21 and 22 different instruments with needs two cover is compared, and can reduce the prime cost of producing stator.
But what the position of division surface 54 can be with shown in Fig. 5 and 6 is different.Some other methods that shown in Fig. 7 a-c stator core 20 are divided into first stator component 21 and second stator component 22.These accompanying drawings are not intended to illustrate separately all figures of the possible modification of stator core.A reason that stator core 20 is divided at least two stator components 21 and 22 is to help to provide coil to the groove 62 of stator 20.By separating stator 20 as mentioned above, can use the coil that twines in advance, and the stator core that the production coil is arranged in its groove can be simple as following, the coil that is about to twine is in advance put into one of them stator component 21 or 22, forms stator by another stator component 21 or 22 is closely contacted with first stator component 21 or 22 then.
At such embodiment shown in Fig. 8-9, wherein stator component 21,22 is divided into several sections 74a-b, 75a-b, 76a-d and 77a-d, these parts with the corresponding direction of the direction of inner rim and neighboring on be adjacent to be provided with.At least in the time will making big stator, so separately stator component is favourable.
Another embodiment of stator core 20 shown in Figure 10.This embodiment can be based among the previously described stator core embodiment any one.In this embodiment, the axial length of peripheral surface 50 can change in each stator tooth 56 and 58 the edge.Among the figure, when when the circumferential length of inner rim 70 is observed the axial length of tooth 56,58, the axial length of tooth 56,58 is from length L
MaxBecome L
MinAgain become L then again
MaxThis variation can be linear.Channel opening 64 can be independent of along the position of inner rim 70 and extend identical axial distance, and this can realize by stator component is set like this, that is, make the extending axially of tooth at the stator component in circumferential position place be L
Max, and be L extending axially of another tooth of identical circumferential position place
Min
Introduce and thisly have the tooth of variable axial length just as in turning motor, introducing skew.When using in conjunction with turning motor, skew is meant the angle " distortion " with the groove that leaves axial direction of electrical degree (measurement).In most of the cases, skew is the characteristic of rotor, sees M.G.Say " Alternating Current Machines ", 5th ed., Longman Scientific﹠amp; Technical, 1983, (ISBN 0-582-98875-6), page 106.Therefore, by the tooth 56 and 58 that introducing has described variable axial length, can reduce the fluctuation of linear motor.
Another embodiment of stator core 20 shown in Figure 11.This embodiment can be based among the previously described stator core embodiment any one.In this embodiment, tooth 56 and 58 axial length extend to and make tooth 56 and 58 contact each other.Compare with the remainder of tooth 56 or 58, this extension is narrower diametrically, thereby obtains protuberance 72.Protuberance 72 diametrically should be enough narrow so that protuberance 72 to reach magnetic flux saturated, thereby make the protuberance 72 of flowing through the path leakage field amount seldom.In addition, protuberance 72 width diametrically can make that this protuberance can be used as aiding support when two stator components 21 and 22 are arranged to closely be connected each other.
In order to make the linear motor linear motor shown in Fig. 4 a-b for example, can use any one in the stator core mentioned above with single stator coil.In order to make the linear motor linear motor shown in Fig. 1 a-c, 2a-b and the 3a-b for example, a plurality of stator cores mentioned above can be set adjacent to each other with a plurality of stator coils.In this stator, in the stator that promptly wherein said stator core is provided with adjacent to each other, from the magnetic flux angle, the adjacent teeth of two adjacent stator cores can be regarded an independent tooth as.Thereby, when determining the tooth pitch of this stator, the center that should use this " magnetic " tooth.In this design, the magnetic tooth that comprises from the soft magnetic material of two different stator cores can be called as whole tooth, and be positioned at each end of stator, each magnetic tooth of only comprising from the soft magnetic material of a stator core can be called as half tooth.In addition, the stator 12 that is used to have the linear motor of a plurality of coils also can be designed to as shown in figure 12.
Figure 12 is the schematic diagram of embodiment that is used for the stator 12 of unshowned two stator coils.Be that with the difference of the stator that comprises stator core as indicated above (wherein, stator core is independent and is provided with adjacent to each other) this embodiment comprises intermediate member 80.This intermediate member 80 is made one, and comprises second tooth, the 58 corresponding teeth 82 with the single stator core shown in Fig. 6, and with first tooth, the 56 corresponding teeth 84 of another single stator core of being arranged to closely contact with first stator core.Thereby described intermediate member 80 partly limits first stator slot 86, and partly limits second stator slot 88.This intermediate member 80 also can be used for making and comprises the stator 12 of quantity more than two stator coil.
Shown in Figure 13 a-c with the corresponding mover 14 of an embodiment of the mover shown in the linear motor of Fig. 3 a-b.This mover can comprise the soft magnetism part 32a-d that is promptly made in conjunction with one of material of Fig. 1 a-c explanation by soft magnetic material, and permanent magnetism part 34a-c.But the inner surface 102 of permanent magnetism part 34a-c follower 14 extends to outer surface 104 substantially, and continuous along the circumference of mover 14.For magnetic flux being transferred to soft magnetism part 32a-d, permanent magnetism part 34a-c can be arranged to closely contact with soft magnetism part 32a-d.Permanent magnetism part 34a-c should not extend across the surface towards stator of mover.And the permanent magnetism part does not need to be arranged to and described flush towards stator, but can stop before will arriving described surface.In the axial direction, the permanent magnetism part can be shorter than soft magnetism part 32a-d.
The magnetic pole N that permanent magnetism part 34a-c is arranged to them is relative in the axial direction with S.And, permanent magnetism part 34a-c be arranged to permanent magnetism part for example the arctic N of permanent magnetism part 34b towards the adjacent permanent magnetism part arctic N of permanent magnetism part 34c for example.Correspondingly, the South Pole S of permanent magnetism part is towards adjacent permanent magnetism part South Pole of permanent magnetism part 34a and 34b for example.Consequently, soft magnetism part 32a-d can be used as the magnet with radial polarised vector.
In addition, permanent magnet can be made into shorter in the axial direction, and promptly the inner surface of the axial length of magnet and follower is to the ratio L between the radical length of outer surface
a/ L
r, can be less than the corresponding ratio of the permanent magnet in the mover of the linear motor among Fig. 1 a-c and the 2a-b.Therefore, help the manufacturing of permanent magnet, this is to have less L because make
a/ L
rThe permanent magnet of value is easier to.Mover also becomes firmer when designing like this.
But mover also can be groove wherein to be set to hold the pipe of magnet.In such an embodiment, groove can be arranged to towards stator, thereby, be contained in this groove and the part of magnet that deviates from stator towards the material of this pipe.The further feature of this mover is at least corresponding to the feature of other embodiment of mover.
According to an embodiment, the mover that is used for linear motor can comprise at least one soft magnetic material part and at least one permanent magnet, described at least one soft magnetic material part and described at least one permanent magnet are axially aligned along mover, and the polarization vector of wherein said at least one permanent magnet is axial.
In addition, the described part of the above-mentioned mover of being made by soft magnetic material can be made by soft magnet powder.
According to another embodiment, mover can comprise at least two permanent magnets, i.e. first permanent magnet and second permanent magnet, described permanent magnet is axially aligned along described, and the distance between the axial centre of described at least two permanent magnets be expection (use) stator tooth pitch 0.75-1.5 doubly.
Except that the foregoing description, the permanent magnet that permanent magnet can be arranged to not have other than second permanent magnet more near first permanent magnet.
According to another embodiment, mover can be a tubulose.
According to another embodiment, described at least one soft magnetic material partly has at least the first axial end portion of band edge face, and described at least one permanent magnet is arranged to contact with the whole end face of described first axial end portion substantially.
According to another embodiment, being arranged to along circumference and axially extended surface and mover concordant of being arranged to towards expection (use) stator substantially with axially extended surface of described at least one permanent magnet along circumference.
According to an embodiment, the linear motor described in any one embodiment of this paper can comprise according to any one mover among the mover embodiment mentioned above.
The shape of the radial section of stator 12 and mover 14 must not be circular.In some applications, radial section may be better for other shape.The triangular stator core 20 that comprises two stator components 21 and 22 shown in Figure 14.This stator core also can be described to leg-of-mutton ring.Stator core 20 can make and/or be provided with any one the identical mode in the stator mentioned above.Will be arranged on the shape that stator coil in the stator core can be independent of radial section twines in advance.The mover that has in the linear motor of described triangular stator core also must form this triangle so that have optimum performance.The shape of the radial section of stator and/or mover can adopt almost Any shape.For example, can promptly be similar to shape of Arabic numerals 8 etc. for the shape that ellipse, rectangle, star, two circles combine, possibility is infinite.By having good at least magnetic flux magnetic permeability and the soft magnet powder or the moldable material of the characteristic of the resistance of electric current formed stator and mover, can help making and have strange and be difficult to the stator and the mover of the shape made usually by above-mentioned.
Another embodiment at linear motor shown in Figure 15 a-b.As the same with the linear motor of 3a-b explanation in conjunction with Fig. 1 a-c, 2a-b, the linear motor of this embodiment comprises stator 112 and mover 114.But in this embodiment, stator 112 is positioned at mover 114, i.e. the mover 114 basic stators 112 that surround.Stator 112 can comprise a plurality of stator coils, and the embodiment among the figure comprises three stator coil 118a-c.But this linear motor also can be arranged to only have a stator coil.
The stator core 120a-c of stator 112 also can the mode similar to the said external stator core be divided into the first stator component 121a-c and the second stator component 122a-c.The stator of the linear motor among Fig. 1-3 a very big difference between the stator of the linear motor of embodiment therewith is, the tooth 156a-c of stator core 120a-c and 158a-c are provided with along the neighboring 150 of stator 112, so that can produce magnetic interaction with mover 114.
In addition, stator core 120a-c can the mode similar to the said external stator core design, and its structural difference need to be and can to produce magnetic interaction with outside mover 114 rather than inner mover.Thereby they can be designed to have the axial tooth length of the variation that is similar to the embodiment among Figure 10, and the tooth protuberance that is similar to the protuberance of the embodiment among Figure 11.Therefore, the feature of previously described outer stator iron core can be applicable to these inner stator cores 120a-c.
In the embodiment shown, stator 112 be included in stator core 120a-c in the inner rim 152 of intracardiac qualification one axial hole.In another embodiment, can not have this hole, promptly the center of each stator core 120a-c can be the entity of being made by the soft magnetic material identical with the remainder of stator core.
Claims (19)
1. stator core that is used for linear motor, described stator core comprises:
Inner rim,
The basic neighboring that surrounds this inner rim,
First and second teeth that are provided with along one of this inner rim or this neighboring,
Be used to admit the groove of stator coil, described groove is arranged on the cavity in the stator core,
Wherein, described stator core is divided into first stator component and second stator component,
Described first stator component comprises described first tooth, and is arranged to part and limits described groove, and is made by soft magnet powder, and
Described second stator component comprises described second tooth, and is arranged to part and limits described groove, and is made by soft magnet powder.
2. stator core according to claim 1 is characterized in that, described first tooth extends a segment distance towards described second stator component vertically, and described distance changes along one of the inner rim of stator core or neighboring; Described second stator component extends a segment distance towards described first stator component vertically, and described distance changes along one of the inner rim of stator core or neighboring.
3. stator core according to claim 1 and 2, it is characterized in that, in described first stator component and described second stator component each all is arranged in described outer circumference and closely contacts each other, and separate at described inner rim place, the channel opening that leads in the described groove between described first and second teeth of being separated to form at described inner rim place.
4. stator core according to claim 1 and 2, it is characterized in that, in described first stator component and described second stator component each all is arranged in described inner rim place and closely contacts each other, and separate in described outer circumference, at the channel opening that leads in the described groove between described first and second teeth of being separated to form of described outer circumference.
5. stator core according to claim 1 and 2 is characterized in that, described first tooth is arranged to closely contact each other with described second tooth; The extension of in described first tooth and second tooth each on the contact area inner radial direction between described first tooth and second tooth is very little, so that reach magnetic saturation during operation in the described extension of described first tooth of stator and second tooth.
6. stator core according to claim 1 and 2, it is characterized in that, described first stator component and described second stator component all comprise at least two parts being made by soft magnet powder, described at least two parts be arranged in the corresponding direction of the direction of described inner rim and neighboring on adjacent one another are.
7. stator core according to claim 1 and 2 is characterized in that the density of each described stator component is at least 6500kg/m
3
8. stator core according to claim 1 and 2 is characterized in that, the resistivity in each described stator component is at least 1 μ Ω m.
9. comprise linear motor according to each described stator core among the claim 1-3.
10. stator core that is used for linear motor, described stator core comprises:
One annular stator iron core, wherein, described annular stator iron core is divided at least two annular stator parts, that is, and first stator component and second stator component; And described stator component is the isotropic body of being made by soft magnet powder.
11. stator core according to claim 10, it is characterized in that, also comprise the groove that is used to admit stator coil, described groove is arranged on the cavity in the stator core, described slot part ground is limited by described first stator component, and is partly limited by described second stator component.
12., it is characterized in that described first stator component comprises first tooth according to claim 10 or 11 described stator cores, described second stator component comprises second tooth, described first tooth and second tooth are provided with along one of the inner rim of annular stator iron core or neighboring.
13. stator core according to claim 12 is characterized in that, described first tooth extends a segment distance towards described second stator component vertically, and described distance changes along one of the inner rim of stator core or neighboring; Described second stator component extends a segment distance towards described first stator component vertically, and described distance changes along one of the inner rim of stator core or neighboring.
14. stator core according to claim 12, it is characterized in that, in described first stator component and described second stator component each all is arranged in described outer circumference and closely contacts each other, and separate at described inner rim place, the channel opening that leads in the described groove between described first and second teeth of being separated to form at described inner rim place.
15. stator core according to claim 12, it is characterized in that, in described first stator component and described second stator component each all is arranged in described inner rim place and closely contacts each other, and separate in described outer circumference, at the channel opening that leads in the described groove between described first and second teeth of being separated to form of described outer circumference.
16. stator core according to claim 12 is characterized in that, described first tooth is arranged to closely contact each other with described second tooth; The extension of in described first tooth and second tooth each on the contact area inner radial direction between described first tooth and second tooth is very little, so that reach magnetic saturation during operation in the described extension of described first tooth of stator and second tooth.
17. stator core according to claim 12, it is characterized in that, described first stator component and described second stator component all comprise at least two parts being made by soft magnet powder, described at least two parts be arranged in the corresponding direction of the direction of described inner rim and neighboring on adjacent one another are.
18. stator core according to claim 12 is characterized in that, the density of each described stator component is at least 6500kg/m
3
19. stator core according to claim 12 is characterized in that, the resistivity in each described stator component is at least 1 μ Ω m.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE0300657A SE0300657D0 (en) | 2003-03-10 | 2003-03-10 | Linear motor |
| SE03006574 | 2003-03-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1771644A CN1771644A (en) | 2006-05-10 |
| CN100358219C true CN100358219C (en) | 2007-12-26 |
Family
ID=20290636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004800096579A Expired - Fee Related CN100358219C (en) | 2003-03-10 | 2004-03-08 | Stator core for linear motor |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP1602164A1 (en) |
| JP (2) | JP4904151B2 (en) |
| KR (1) | KR101008093B1 (en) |
| CN (1) | CN100358219C (en) |
| BR (1) | BRPI0408267A (en) |
| SE (1) | SE0300657D0 (en) |
| TW (2) | TW201031080A (en) |
| WO (1) | WO2004082103A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111009978A (en) * | 2019-12-18 | 2020-04-14 | 安徽德科电气科技有限公司 | Single-phase generator for illumination |
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| KR100748979B1 (en) * | 2005-05-17 | 2007-08-13 | 엘지전자 주식회사 | Stator of Linear motor |
| EP1724907B1 (en) * | 2005-05-17 | 2010-12-08 | LG Electronics Inc. | Linear motor |
| WO2007034195A1 (en) * | 2005-09-21 | 2007-03-29 | Ricardo Uk Ltd. | Linear actuator |
| JP5415161B2 (en) * | 2008-08-08 | 2014-02-12 | 山洋電気株式会社 | Linear synchronous motor |
| NL2003653C2 (en) * | 2009-10-16 | 2011-04-19 | Brainct Noord B V | Lineair actuator, device and method therefor. |
| KR101081516B1 (en) * | 2010-02-02 | 2011-11-10 | 미래산업 주식회사 | Mover of Linear Motor, Method for Manufacturing thereof, and Linear Motor having the same |
| CN101997388A (en) * | 2010-09-21 | 2011-03-30 | 佛山市顺德区精艺动力科技有限公司 | Primary magnetic conduction structure of linear motor |
| KR101242468B1 (en) * | 2011-10-12 | 2013-03-12 | 한국철도기술연구원 | Core for tubular permanent magnet actuator and tubular permanent magnet actuator using the same |
| CN102510145B (en) * | 2011-11-03 | 2014-01-15 | 中国石油天然气股份有限公司 | Component force type rotor of underground cylindrical linear motor |
| FR2986923B1 (en) * | 2012-02-15 | 2014-10-31 | Moving Magnet Tech | COMPACT DIRECT DRIVE ACTUATOR GENERATING CONSTANT FORCE |
| TWI484724B (en) * | 2012-07-27 | 2015-05-11 | Chieftek Prec Co Ltd | A coil unit and coil assembly for non-ferrite core linear motor |
| TWI525962B (en) | 2014-12-05 | 2016-03-11 | 財團法人工業技術研究院 | Outer-rotor permanent magnet brushless motor |
| JP2017060288A (en) * | 2015-09-16 | 2017-03-23 | Ｋｙｂ株式会社 | Linear motor, linear actuator therewith, and method of manufacturing linear motor |
| CN106685174B (en) * | 2016-08-11 | 2019-07-19 | 邢台旭力机电科技有限公司 | A kind of humorous bat electric linear percussion mechanism |
| KR20210003922A (en) * | 2018-06-18 | 2021-01-12 | 미쓰비시덴키 가부시키가이샤 | Stator of linear motor, linear motor and linear motor system |
| KR102466986B1 (en) * | 2020-03-27 | 2022-11-11 | 엘지전자 주식회사 | Linear motor and a linear compressor using the same |
| CN114200663B (en) * | 2021-10-19 | 2023-04-28 | 江南大学 | Novel high efficiency voice coil driver of structure and deformable mirror |
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2004
- 2004-03-08 EP EP04718470A patent/EP1602164A1/en not_active Withdrawn
- 2004-03-08 CN CNB2004800096579A patent/CN100358219C/en not_active Expired - Fee Related
- 2004-03-08 KR KR1020057016773A patent/KR101008093B1/en not_active IP Right Cessation
- 2004-03-08 WO PCT/SE2004/000337 patent/WO2004082103A1/en active Application Filing
- 2004-03-08 BR BRPI0408267-2A patent/BRPI0408267A/en not_active Application Discontinuation
- 2004-03-08 JP JP2006507952A patent/JP4904151B2/en not_active Expired - Fee Related
- 2004-03-10 TW TW98145194A patent/TW201031080A/en unknown
- 2004-03-10 TW TW93106391A patent/TWI325214B/en not_active IP Right Cessation
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| US6060810A (en) * | 1998-07-13 | 2000-05-09 | Lg Electronics Inc. | Stator for linear motor by staggered core lamination |
| CN1304575A (en) * | 1999-05-11 | 2001-07-18 | 赫加奈斯公司 | Stator with teeth formed from soft magnetic powder material |
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| CN111009978A (en) * | 2019-12-18 | 2020-04-14 | 安徽德科电气科技有限公司 | Single-phase generator for illumination |
Also Published As
| Publication number | Publication date |
|---|---|
| KR101008093B1 (en) | 2011-01-13 |
| EP1602164A1 (en) | 2005-12-07 |
| TW201031080A (en) | 2010-08-16 |
| KR20050106511A (en) | 2005-11-09 |
| JP2011004602A (en) | 2011-01-06 |
| JP4904151B2 (en) | 2012-03-28 |
| SE0300657D0 (en) | 2003-03-10 |
| BRPI0408267A (en) | 2006-03-07 |
| TW200425617A (en) | 2004-11-16 |
| TWI325214B (en) | 2010-05-21 |
| CN1771644A (en) | 2006-05-10 |
| JP2006520179A (en) | 2006-08-31 |
| WO2004082103A1 (en) | 2004-09-23 |
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