CN1245794C

CN1245794C - Linear motor

Info

Publication number: CN1245794C
Application number: CNB01139630XA
Authority: CN
Inventors: 金容日
Original assignee: Gater Science & Tech Co Ltd
Current assignee: Gater Science & Tech Co Ltd
Priority date: 2000-11-29
Filing date: 2001-11-28
Publication date: 2006-03-15
Anticipated expiration: 2021-11-28
Also published as: KR100331232B1; KR20010044157A; CN1356760A; DE10158562A1

Abstract

The present invention relates to a multiphase loop assembly which includes: a first top arm and bottom arm on the first plane and a first loop having a first loop center part including a left arm and a right arm on the second plane; a second top arm and bottom arm on the first plane and a second loop having a second loop center part including a left arm and a right arm on the second plane, and the left arm of the second loop nears to the right arm of the first loop; a third top arm and bottom arm on the third plane and a third loop having a third loop center part including a left arm and a right arm on the second plan and the locating part includes the right arm of the first loop and the left arm of the second loop, wherein the third top arm cooperates with the first and second top arms, and the third bottom arm cooperates with the first and second bottom arms; the first, second, and third loop move with the center part that has a thickness on the second plane equal to that of a single loop, and each top arm has a constant thickness that is twice than the single loop thickness to cooperate with the bottom loop.

Description

Linear motor

Technical field

The present invention relates to linear motor.

Background technology

Linear motor has many advantages, for example very high acceleration (up to 10 times to acceleration of gravity, i.e. 10g) and sub-micron positioning accuracy, and linear motor can ideal be used for novel device or device upgrade.Other advantage comprises only having a movement parts, and this makes it simple in structure and reliable, does not have kick and has high stability.Contactless has also reduced wearing and tearing, has prolonged the life-span and has reduced maintenance.Linear motor can be used for multiple application.For example, can be used for semiconductor manufacturing facility, automation equipment in factory, micro-lithography device and other are used for the accurate telecontrol equipment of accurate control appliance and instrument position.

The conventional synchronization linear motor comprises that one is carried out the magnet array of electromagnetic interaction with coil array.Cooperate with magnet array and on coil array, produce electromagnetic force (being called Lorentz force), and the electromagnetic force on coil array makes coil array be driven with respect to magnet array, perhaps in contrast.Like this, linear motor can comprise a static magnets array (coil array is driven) or a stationary coil array (magnet array is driven) here here.Coil array be mechanically fixed to usually one can with the translation support (or bearing frame) that is slidingly matched of cover track on.

Typically, traditional moving coil type linear motor has permanent magnet in movable coil assembly both sides.This magnet is fixed on the inner surface of two tracks, so that toward each other.Magnet is mounted adjacent, and the pole orientation of each follow-up magnet is with previous opposite.

Coil block is made of several coils that embedding is fixed in the epoxy resin board.Each coil comprises the electric wire that is wound on the framework that is generally rectangle, at frame center opening is arranged.Electric wire twines on the magnetic flux direction that produces magnetic field perpendicular to permanent magnet.A series of coils are adjacent to each other and are arranged between two permanent magnet opposed arrays.Be wrapped in the magnetic line of force of electric wire cutting between two relative permanent magnet systems on the coil, the electric current that is switched to electric wire produces the Lorentz force of moving coil.

In order to increase power of electric motor, the area of magazine needs to increase, so that more magnetic flux can pass through coil.For increasing the frame area of passing through for magnetic flux, can " stacked " coil, to utilize the non-activity space of hub of a spool part.In this layout, a side of magazine can be arranged in the opening of another magazine.Fig. 1 represents so a kind of arrangement form.As shown in the figure, five square coil 22,24,26,28,30 patterned layers disposed one over.Coil 22 has two horizontal side arm 22a and 22b, two vertical side arm 22c and 22d, and an opening 22o.Similar, coil 24 has two horizontal side arm 24a and 24b, two vertical side arm 24c and 24d.Side arm 24c is arranged among the opening 22o of coil 22, to capture the magnetic flux that passes opening 22o.

For threephase motor, common three coils are arranged in series with each other successively.Three phase mains has three " fire " lines, has the phase difference of 120 degree each other.The three phase mains cost is low, efficiently also can provide big staring torque.For each phase, use a coil.For threephase motor, three coils also can be stacked as one group of use.Fig. 2 represents the end view of the multilayer coil of three phase mains.Can find, because at stacked three coils of certain position, the thickness of coil 22 and 24 assemblies or highly be three times of each independent coil thickness.Varied in thickness, a thickness series is 1d, 2d, 3d, 2d, 1d, d is the thickness of a coil here.Do not wish to occur 3d thickness during production, to such an extent as to because the too thick coil of 3d need be in certain position bends, and the structural intergrity of coil can be destroyed and/or reduce to these power.And, do not wish to occur varied in thickness (1d, 2d, 3d, 2d, 1d thickness series).

The U.S. Pat 4 of Frandsen, 314,295 disclose a kind of flatwise coil array of actuators, wherein each actuator is included in a certain amount of flatwise coil number of turn of at least one side on the planar substrates, between the magnet of opposite polarity, arrange in ' overlapping ' mode each other and with respect to each pole element by these coils along the channel arrangement that is made of a pair of relative guide rail for this substrate.Thereby when the coil turn energized selected, substrate moves with controllable way and locatees.

The United States Patent (USP) 4390827 of Imahashi discloses the two-phase linear electric motors of a kind of use direct current (DC), wherein uniformly-spaced forms the magnetic field of the flow direction that alternately reverses along straight line.In the patent of Imahashi, one group of twin coil is arranged in this magnetic field, and location by this way: make and to pass the magnetic line of force at utmost the time when a coil that the magnetic line of force that another coil is handed over section reaches minimum degree.Arranged that a large amount of permanent magnets are right, these permanent magnets are alternately reverse to the magnetic direction that produces.Two coils are according to apart half spacing interlaced arrangement.The part of coil in magnetic field is wound for flat pattern, and the coiling width of coil is equal substantially each other with the width in this coil inside space.In a pair of coil, coil is arranged in such a way, and makes one a side arm of coil be installed in the inner space of another coil.In another right example of this coil, two coil sides arm rests side arm and are arranged side by side also fixed to one another.

The United States Patent (USP) 4758750 of Itagaki etc. discloses a kind of coil mobile model linear motor, wherein heterogeneous moving coil comprises a plurality of coil units, and each coil width in them is not more than the longitudinal length of the permanent magnet of the stationary part that formation cut apart mutually by a plurality of coils.Be arranged in the coil unit in the same plane continuously, its core is not overlapping.Although be a plurality of phase places of a plurality of coils, the core of moving coil unit has the thickness of single phase winding.In the patent of Itagaki etc., moving coil comprises three coil units, is entwined in the width of their permanent magnet width 1/3 in being parallel to the plane of the page.The coil unit group is left the single coil unit, and the core of coil unit group does not overlap each other like this, and the thickness of moving coil core equals the thickness of single phase winding.Do not become the coil upper end of inverse relationship and lower end to have enough big space around them with magnet, they can form different shape.Described top and bottom can have the thickness that equals single phase winding, the thickness of two phase coils and the thickness of three-phase coil respectively.Because stacked, the core of moving coil can have the thickness between 1 times to 3 times of coil thickness.

The United States Patent (USP) 4839543 of Beakley etc. discloses a kind of moving coil type linear motor, it have that alternately arrange at the center, have heterogeneous permanent magnet row, and have the multipole coil block that is positioned at magnet row both sides.Magnetic circuit connect material be substantially with permanent magnet at sustained height and be positioned at the coil block outside.Coil block comprise a series of with heterogeneous connection, belong to the single coil of multipole relation.In certain position that is not the coil block end, the independent coil of a phase is adjacent one another are and interconnect, as a result electric current at single direction by them.The overall width of single coil equals from distance of identical point on the adjacent magnet a bit on the magnet, and the thickness of single coil is the result that gross thickness is removed by the twice of number of phases.

For further increasing power of electric motor, can stacked two motor subelements.Fig. 3 represents that has a this motor 50 that is installed in the first motor subelement 60 on the second motor subelement 70.The motor subelement comprises the yoke 61 with top 61a and bottom 61b.On each permanent magnet array 63a or 63b are installed in top 61a and bottom 61b, wherein the pole end piece of magnetic stripe is arranged as the alternatively distributed N utmost point/S utmost point structure.Elongate coil 65 is arranged between magnet array 63a and the 63b.Similar, the second motor subelement 70 comprises the yoke 71 with top 71a and bottom 71b.On each permanent magnet array 73a or 73b are installed in top 71a and bottom 71b, wherein the pole end piece of magnetic stripe is arranged as the alternatively distributed N utmost point/S utmost point structure.Elongate coil 75 is arranged between magnet array 73a and the 73b.When electric current is switched on coil 65 and 75, produces Lorentz force and drive the traversing carriage that is fixed on two coils 65 and 75.As shown in Figure 3, each unit in the respective motor subelement 60 and 70, the magnetic line of force 67 and 77 has independent flux circuit respectively.Although the magnetic line of force 67 and 77 flows on same direction (addition in Fig. 3), they also can in the opposite direction flow (or subtracting each other).And because stacked, distance 69 (equaling the thickness of part 61b and 71a) separate magnet array 63b and 73a.Because (i) existence of motor 60 and 70 electric machine casing has increased distance 69; And (ii) independent flux circuit, magnetic circuit prolongs as a result.

Summary of the invention

On the one hand, a polyphase winding assembly comprises: first coil, and it has first top arm and end arm and the first hub of a spool part that comprises the first coil left arm and right arm on second plane in first plane; Second coil that has second top arm and the end arm in first plane and have second hub of a spool part that comprises the second coil left arm and right arm on second plane, and the contiguous first coil right arm of the second coil left arm is arranged; And one have the 3rd top arm and the end arm in the 3rd plane and have the tertiary coil that comprises tertiary coil left arm and right arm and tertiary coil core on second plane, and place, the location of tertiary coil core comprises the first coil right arm and the second coil left arm, wherein the 3rd top arm cooperates with first, second top arm, and the 3rd end arm cooperates with first, second end arm; Arrange that first, second, third coil moves with the core that thickness on second plane equals single coil thickness, has the constant thickness that doubles above-mentioned thickness when each top arm cooperatively interacts and arm cooperatively interacts at each end.

The correction of above-mentioned aspect can comprise one of following aspect or multinomial.Each coil is ' gull wing ' shape.And each coil can twice bending.Coil can have the knee of 45 degree, connects the left arm of each coil and top arm and the end arm that right arm arrives this same coil respectively.The interval on first plane and second plane is equivalent to half of coil thickness.Can in the gap, move at vertical layout coil in magnetic field.Can increase interpole coil in coil block, adjacent windings has identical with it thickness.Like this, can increase the 4th coil that has the 4th top arm and the end arm in first plane and have the 4th hub of a spool part that comprises the 4th coil left arm and right arm on second plane, the contiguous described second coil right arm of described the 4th coil left arm is arranged.Can increase the 5th coil that has the 5th top arm and the end arm in the 3rd plane and have the 5th hub of a spool part that comprises the 5th coil left arm and right arm on second plane, and the contiguous tertiary coil right arm of the 5th coil left arm is arranged.First, second, third, fourth, the 5th coil moves with the core that thickness equals single coil thickness, has the thickness that doubles above-mentioned thickness when each top arm cooperatively interacts and arm cooperatively interacts at each end.Can use a yoke, yoke has first notch that holds coil block and second notch that can hold second coil block.Each notch has two relative faces, and wherein each relative face also comprises and is oriented to row and constitutes the magnet plane and have a plurality of magnets of a longitudinal axis, on the surface on magnet plane with alternate pole orientation mode arranged in orientation magnet.

On the other hand, linear motor yoke assembly comprises first coil block and second coil block, and each coil block is made up of a plurality of coils; And one have two be fit to hold first coil block and second coil block, the housing of longilineal notch basically, wherein each notch has two relative faces, each relative face also comprises and is oriented to row and has a plurality of magnets of a longitudinal axis, on the surface on magnet plane with alternate pole orientation mode arranged in orientation magnet.

The correction of linear motor yoke assembly can comprise one of following aspect or multinomial.The magnetic line of force may reside on the yoke, and in single loop the magnet on transversal first and second notches.Each coil block can comprise: first coil that has first top arm and the end arm in first plane and have first hub of a spool part that comprises the first coil left arm and right arm on second plane; Second coil that has second top arm and the end arm in first plane and have second hub of a spool part that comprises the second coil left arm and right arm on second plane, and the contiguous first coil right arm of the second coil left arm is arranged; And tertiary coil that has the 3rd top arm and the end arm in the 3rd plane and have the tertiary coil core that comprises left arm and right arm on second plane, the place, location of tertiary coil core comprises the first coil right arm and the second coil left arm, wherein the 3rd top arm cooperates with first, second top arm, and the 3rd end arm cooperates with first, second end arm; Arrange that first, second, third coil moves with the core that thickness on second plane equals single coil thickness, has the constant thickness that doubles above-mentioned thickness when each top arm cooperatively interacts and arm cooperatively interacts at each end.These two notches can comprise eight magnets that are installed in two notch surface, and wherein in single loop, flux circuit is transversal to pass eight magnets.Housing can be a W shape.Each coil block comprises that a thickness equals the core of single coil thickness, and each coil block has top and the bottom that thickness equals above-mentioned thickness twice.

Aspect another, linear motor comprises first coil block and second coil block, and each coil block can comprise: first coil that has first top arm and the end arm in first plane and have first hub of a spool part that comprises the first coil left arm and right arm on second plane; Second coil that has second top arm and the end arm in first plane and have second hub of a spool part that comprises the second coil left arm and right arm on second plane, and the contiguous first coil right arm of the second coil left arm is arranged; And tertiary coil that has the 3rd top arm and the end arm in the 3rd plane and have the tertiary coil core that comprises tertiary coil left arm and right arm on second plane, the place, location of tertiary coil core comprises the first coil right arm and the second coil left arm, wherein the 3rd top arm cooperates with first, second top arm, and the 3rd end arm cooperates with first, second end arm; Arrange that first, second, third coil moves with the core that thickness on second plane equals single coil thickness, has the constant thickness that doubles above-mentioned thickness when each top arm cooperatively interacts and arm cooperatively interacts at each end; One have two be fit to hold first coil block and second coil block, the housing of longilineal notch basically, wherein each elongate slot has two relative faces, each relative face also comprises and is oriented to row and has a plurality of magnets of a longitudinal axis, on the surface on magnet plane with alternate pole orientation mode arranged in orientation magnet.

The advantage of native system can comprise one of following aspect or multinomial.The multilayer coil sub-assembly has obtained high magnetic flux density when minimizing its appearance profile and size.The multilayer coil sub-assembly has the thickness of single coil in the central area, have the thickness of two coils in the coil assembly end.No matter stacked coil number how, all be the twice of coil thickness at the thickness of the every end of coil.This lamination techniques than existing technology is good, in the lamination techniques of existing technology, depends on stacked position, has the end thickness (3d, 2d, 1d, wherein d is the thickness of coil for 1d for example, 2d) of variation.Twice bending of coil also is favourable, and this is owing to allow the angle that coil bending is very little, rather than wide-angle.This bending has reduced the stress on the coil, and is favourable to global reliability.

And, for the high magnetic flux density that obtains to be equal to, do not need expensive core material such as steel alloy with high saturation and magnetic intensity and high magnetic permeability, just obtained high magnetic flux density.Like this, obtain the collaborative multilayer coil sub-assembly of supporting high-power linear motor, and cost is low, overall dimension is little.

The multilayer coil sub-assembly thin thickness and the compactness of this linear compressor.Thin coil winding arrangement has increased motor moment constant and has reduced bearing frame weight.Motor moment constant increases and the reduction of bearing frame weight has improved performance and increased possible acceleration.To three-phase power distribution system, the power that the increase linear motor applies is still more stable at whole motor duration of work.

When the multilayer coil sub-assembly used with integrated double motor subelement, cooperative effect was further amplified.In integrated double motor subelement, the magnetic line of force flows and passes whole yoke, enters and leaves the upper and lower edge of yoke, and pass whole magnet array.This is opposite with the conventional linear motor, and in the conventional linear motor, as a magnetic line of force group, the magnetic line of force enters and leaves relative magnet array; Also as another magnetic line of force group, the magnetic line of force enters and leaves relative magnet array.Like this, in order to illustrate, be that eight magnets are passed in the magnetic flux circulation here, rather than four magnets are passed in the such magnetic flux circulation of conventional art.

The yoke design allows that relative magnet array moves close and shortening magnetic flux magnetic circuit each other.When stacked, owing to eliminated a flux paths, flux paths further shortens motor as a result according to the present invention.Reduce magnetic circuit apart from having increased magnetic flux density to support high-power linear motor.Because Magnetic Circuit Shape reduces the magnetic circuit distance and also allows the thin magnet of use.

The provide support high magnetic flux density of high power linear electric motors of integrated double motor subelement design.Gained linear electric motors thin thickness also has cramped construction.And yoke and coil assembly provide high magnetic flux density and produce the big moment of linear electric motors.As additional benefits, the size of motor allows that linear motor applications is requiring the occasion of size restrictions.For the application that requires secondary power, motor can amplify, stacked motor more than two.In this case, required magnet is than the further attenuation of above-mentioned double motor subelement magnet.Motor also has high efficiency and running cost low, and the needs of response application well.

From the following explanation that comprises accompanying drawing and claims, other advantage and feature can be apparent.

Description of drawings

Fig. 1 represents existing technology multilayer coil arrangement form.

The three-dimensional view of Fig. 2 presentation graphs 1 multilayer coil arrangement form.

Fig. 3 represents to have in the prior art the stacked motor of two motor subelements.

Fig. 4 A, 4B and 4C represent the zoomed-in view of three-dimensional view, sectional view and certain part of linear motor respectively.

Fig. 5 represents the three-dimensional view of motor yoke.

Fig. 6 schematically shows the magnetic line of force of the yoke that passes Fig. 5.

Fig. 7 and Fig. 8 represent three-dimensional view and the sectional view of an embodiment of coil block respectively.

Fig. 9 is the sectional view of electric wire in the coil of Fig. 7 and Fig. 8.

Figure 10 represents to simplify the sectional view of motor.

Figure 11 represents the magnetic flux in Figure 10 motor.

Figure 12 represents the sequence of motion of Figure 10 motor.

Figure 13 represents to use an embodiment of the linear motor of the second coil block embodiment.

Figure 14 represents the sectional view of Figure 13 coil block embodiment.

Embodiment

In more detail with reference to accompanying drawing, represent the structure chart of linear motor here now.Should be appreciated that,, realized the motor power (output) raising by coil block with the stacked a plurality of coils of a definite form.Wherein coil block is in itself and the interactional position of permanent magnet array, and its thickness is the thickness of a coil.Motor power (output) also can be by being improved at a whole yoke inner stacks motor subelement.From the research of these structure charts, can more easily understand these features.

Fig. 4 A, 4B and 4C represent the zoomed-in view of three-dimensional view, sectional view and certain part of linear motor 401 respectively.Linear motor 401 comprises as two of linear motor 401 tracks elongated bearing 406A and

406B.Bearing

406A and 406B arranged stationary are on elongated shape substrate 402.

Bearing

406A and 406B are sliding bearings, allow such as load such as bearing frame or bearing supports and utilize linear motor 401 to move certain distance.

Actuator 403 is arranged in substrate 402 tops, and between bearing 406A and 406B.In Fig. 4 C, Fig. 5 and Fig. 6, actuator 403 is described in detail.Top board 405 is arranged in

bearing

406A, 406B and linear actuators 403 tops.Top board 405 has outstanding part or tab downwards, connect with linear actuators 403, and stationary actuator 403 is to the supporting base of motor 401.A position coder 404 is installed on the top board 405, and is positioned between top board 405 and the substrate 402.Encoder 404 detects the current location of linear motor 401.Various types of position transducers be can use, optic position sensor, resistance (potential measurement) position transducer and magnetic position sensor (inductosyn) comprised.In optical pickocff, removable coding disk utilization perhaps utilizes such as stainless steel, nickel, copper or similarly metallic plate manufacturing in the glass plate manufacturing of its surface evaporation deposition chromium; Some part of annular section by etching utilizes the photocell (LED) of light source to scan forms the light transmission part.Has light source and light is accepted part in any side of removable coding disk.Light source and light are accepted part and are made of the photocell (omitting among the figure) and the photoreceptor of given number respectively.When the light transmission part is positioned at photoreceptor the place ahead, points to the above-mentioned light transmission part of light transmission of removable coding disk and enter the corresponding photosensitive device from light source, and receive the signal of light by photoreceptor output representative.The potential measurement transducer is a voltage divider with sliding contact in essence, and described sliding contact engages with the carbon film band that is connected with voltage source or other resistive element.The output voltage of transducer is the voltage on the sliding contact or the proportional numerical value of this voltage.This position influence sliding contact is with respect to the position of resistive element, therefore can use the output voltage values of transducer to represent the position that detects or measure.Magnetic position sensor uses a plurality of square wave coils that are installed in a stationary element surface, and one is installed on the displaceable element and the coil that is connected with AC power (AC).Each square wave coil comprises a plurality of ' height ' and ' low ' part and has different cycles.Change by the coefficient of mutual inductance that detects between this coil and a plurality of square wave coil, native system is determined the position of displaceable element with respect to stationary element.When power supply energize during to coil, if contiguous ' height ' square wave part of coil, the then big electric current of induction in the square wave coil.If contiguous ' low ' square wave part of coil is then just responded to little electric current in the square wave coil.Therefore, can determine the position of displaceable element from the signal of square wave coil along stationary element length.

Fig. 4 C represents actuator 403 in more detail.Actuator 403 comprises a yoke 511 with three bifurcateds or

part

511b, 511a and 511c, and the three constitutes two cavity 530a and 530b.Three bifurcateds or

part

511b, 511a and 511c at one end utilize a public part 511d to couple together, and above-mentioned part 511a constitutes two

cavity

530a and 530b to 511d is common.That be installed in every of

cavity

530a and 530b (upper and lower) is

permanent magnet array

512a, 512b, 512c and the 512d of magnet band, and wherein the magnet strap ends with the arranged in form of the N utmost point/S utmost point alternately together.Longilineal substantially

coil

514a and 514b are arranged among cavity 530a and the 530b.Coil 514a and 514b wind the line on the direction of the magnetic flux in the magnetic field that produces perpendicular to permanent magnet.When electric current was switched to coil array, the mobile support frame that produces in Lorentz force and the driven unit 403 moved.In Fig. 5 and Fig. 6, yoke 511 is described in detail, and describes an exemplary coil in detail such as coil 514a at Fig. 7.

Fig. 5 represents the three-dimensional view of yoke 511.Yoke 511 can or contain the manufacturing of molybdenum supermalloy by the material with high magnetic permeability and high saturation such as permalloy.At the inner surface of last yoke 511b (pointing to cavity 530a) permanent magnet array 512a is installed, permanent magnet array 512b is installed at inboard and the upper surface of middle yoke 511a.Accordingly, permanent magnet array 512c is installed, permanent magnet array 512d is installed at the inner surface of lower yoke 511c at the inner surface of middle yoke 511a (pointing to the center of cavity 530b).

Permanent magnet array

512a, 512b, 512c and 512d comprise the permanent magnet band of any number, and arranged alternate permanent magnet bar distributes with the magnetic pole that obtains alternate.

Permanent magnet bar 512a to 512d in its thickness direction permanent magnetization.The width of permanent magnet bar refers to the size of permanent magnet bar along the motor direction of motion.In one embodiment, every permanent magnet bar has essentially identical width.The permanent magnet bar can be by any permanent magnetic material, and for example neodymium iron boron (NdFeB) constitutes.The permanent magnet bar can be connected respectively on yoke 511b, middle yoke 511a and the lower yoke 511c according to any form that comprises assembly glue and epoxide-resin glue.Other connects the mechanism of permanent magnet bar on

yoke

511b, 511a and the 511c respectively, comprises machinery chucking or magnetic attraction.Permanent magnet array has homogeneous thickness, makes their surface be positioned at the constant distance in coil block surface of armature (not illustrating).It is sinusoidal magnetic flux distributions basically that the design magnet has along the generation of mobile axis direction, comes the magnetic field interaction that produces with coil block.

Fig. 5 structure is better than the structure of existing technology shown in Figure 3, and Fig. 3 stacks two inferior motor field frame simple layer.At first, the stacked electric tools of Fig. 3 has two that form yoke in the thick monolithic, and it has produced two independent flux circuits again.When the thickness of the stacked motor field frame of the middle yoke before forming in the technology reduced, relative magnet can attract each other and cause housing distortion.On the contrary, the structure of Fig. 5 has been offset the magnetic force of four magnet arrays, does not face this distortion.Bifurcated 511a can be thinner than the thickness of the single motor engine housing 61b of Fig. 3 and 71a in the whole monolithic.And owing to shortened flux paths, that magnet array 512a to 512d can be made is thinner.

Fig. 6 schematically illustrates the magnetic line of force 632 that passes yoke 511.As shown in the figure, many magnetic lines of force 632 vertically pass yoke 511, enter and leave the top edge and the lower limb of whole yoke 511, and pass all

magnet array

512a, 512b, 512c and 512d (Fig. 5).The independent magnetic line of force that passes all magnets in two inferior motor 60 and 70 has shortened magnetic flux path.By eliminating two thick housings of traditional inferior motor, magnetic flux path further shortens.This is opposite with the conventional linear motor with long magnetic flux path, and the magnetic flux path that conventional motors is long is owing to stacked two independent motor field frames, and owing to has a plurality of magnetic line of force groups.By shortening magnetic flux path, magnetic flux density increases, and causes more high-power motor.

The yoke of Fig. 5 and Fig. 6, its thin thickness and compact conformation.And yoke and coil assembly provide high magnetic flux density and produce big linear motor moment.And,, can increase motor power (output) by stacked any amount N inferior motor although yoke 511 just has two inferior motor 60 and 70.In this stacked N inferior motor,, can reduce the thickness of magnet because magnetic flux path shortens.

Fig. 7 and Fig. 8 represent to comprise the three-dimensional view and the sectional view of an embodiment of the coil block 690 of coil 692-708 respectively.Because loop construction is identical, only thoroughly discusses representative coil 692-698 and their correlation.

Coil 692 comprises a single piece that is generally rectangle, and it has top arm 692a, end arm 692b, left arm 692c and right arm 692d respectively.

Arm

692a, 692b, 692c, 692d constitute opening 692o together.In one embodiment, top arm 692a and end arm 692b are shorter than slender arm 692c, 692d.,

arm

692a, 692b, 692c, 692d can be symmetrical or asymmetric and take any form.With respect to the plane at left arm 692c and right arm 692d place, top arm 692a is with in end arm 692b is arranged in a different plane.

As shown in Figure 8, because

arm

692c and 692d are at various height, from

arm

692c and 692d in the bottom and

arm

692a, 692b when the top view, coil 692 is ' gull wing ' shape, and two inflection points are arranged in coil: inflection point occurs in coil 692 and carries out the transition to a little 682, the second inflection points and occur in coil 692 and carry out the transition to a little 684 from putting 682 from putting 680.The advantage of two bending structures is that coil only needs crooked low-angle.This progressively crooked mechanical stress that has reduced in the coil manufacturing has increased coil intensity, and the result obtains firmer and reliable linear motor.

Similar, coil 694 comprises the single piece of a common rectangle, and it has top arm 694a, end arm 694b and a pair of relative left arm 694c and right arm 694d respectively.Arm 694a, 694b, 694c, 694d constitute opening 694o together.In one embodiment, top arm 694a and end arm 694b are shorter than arm 694c, 694d, and raise with respect to slender arm 692c, 692d.Similar, coil 696 comprises the single piece of a common rectangle, and it has top arm 696a, end arm 696b and a pair of relative left arm 696c and right arm 696d respectively.Arm 696a, 696b, 696c, 696d constitute opening 696o together.

The right part of opening 692o holds arm 694c, and the left part of opening 692o holds a right arm that is arranged in the coil in coil 692 (not illustrating) left side.Accordingly, arm 694d is arranged in the left part of opening 696o, and arm 698c has occupied the right part of opening 696o.This order is arranged continuously along coil block length.

As shown in Figure 8, the coil 692-694 of ' gull wing ' shape allows that two coil layer gather into folds and only has the thickness of one deck coil at central opening 692o, 694o and 696o place.In the present embodiment, coil crooked 45 degree and 1/2d distances between point 682 and 684.As shown in the figure, the coil thickness at central opening 692o is d.Thickness d is slightly less than the distance between

magnet array

512a and 512b, thereby allows that coil moves.

The polyphase winding assembly of Fig. 8 comprises one first coil 692, and it has: the first top arm 692a and end arm 692b in first plane of extending between top arm 692a and end arm 692b center line; And the first hub of a spool part that comprises the first coil left arm 692c and the first coil right arm 692d on second plane of extending between the first coil left arm 692c and the first coil right arm 692d center line.This assembly also comprises one second coil (not illustrating in the drawings), it has: second top arm 696a in first plane and end arm 696b, and second hub of a spool part that comprises the second coil left arm and right arm on second plane and the contiguous first coil right arm layout of the second coil left arm.The coil block of Fig. 8 also comprises a tertiary coil 694, and it has: the 3rd top arm 694a and end arm 694b in the 3rd plane of extending between the 3rd top arm 694a and end arm 694b center line; And the tertiary coil core that comprises tertiary coil left arm and right arm on second plane, and place, the location of tertiary coil core comprises the first coil right arm and the second coil left arm, wherein the 3rd top arm cooperates with first, second top arm, and the 3rd end arm cooperates with first, second end arm.In Fig. 8, arrange that first, second, third coil moves with the core that thickness on second plane equals the single coil thickness d, has the constant thickness 2d that approximately doubles above-mentioned thickness when each top arm cooperatively interacts and arm cooperatively interacts at each end.

The thickness that is had when as a comparison, the coil of existing technology is stacked is between 2 and 3 times of single coil thickness.In this example, when the area of realizing capturing from relative magnet array magnetic flux is double, obtained minimal thickness.Because the coil attenuation, magnetic flux increased when magnetic circuit shortened, the two collaborative power that increases linear motor.In addition, by keeping stable 2d thickness along coil block, structural strength significantly improves.

The sectional view of electric wire is illustrated in Fig. 9 in coil 692-698.As shown in the figure, the electric wire of coil 692-698 is arranged with planar sequence according to unified width d.Multilayer electric wire winding comprises the electric conducting material of the linear formula of multiturn, utilizes polymeric material to insulate between each circle of electric wire form material.The single winding of coil utilizes curable epoxy resin composition to encapsulate.In one embodiment, this composition epoxy resin utilizes suitable curing component to carry out hot curing, to carry out the coil impregnation process.Schematically the cross section of coil array comprises the array that 8 coils arranging with plane form constitute, and each coil has the square-section successively, and the cross section has 7 * 7 electric wires and twines array.

The operation of the motor that Figure 10-12 expression is simplified.Referring now to Figure 10, the sectional view of motor is simplified in expression.This motor has the coil block 902 between relative magnet array 904-906, and wherein the magnetic pole of magnet is opposite relatively.Like this, for example, the magnet 914 in the magnet array 904 is relative with the magnet in the magnet array 906 916.And magnet 914 polarity are the arctic (N utmost points), and magnet 916 polarity are the South Pole (the N utmost point).And the electric current that is switched to coil block 902 can be each among the three-phase electricity BAC, controls the motion of the motor of each magnet correspondence among the magnet array 904-906.In this case, coil block 902 has the coil arm to following three phase mains ordinal response, i.e. A_BA ' CB ' AC ' BA ' CB ' _ C '.Electric current on loop A, B and C is the sine wave of phase difference 120 degree.Apostrophe is represented the sense of current and is not had apostrophe person opposite.For example the A place sense of current is opposite with A '.

Figure 11 represents to be applied to the magnetic flux of coil block 902, and Figure 12 represents the motion that obtains.Referring now to Figure 12, the schematic motion of expression motor 900.Motor 900 has by to following order electric current: the array that 12 coil arms of A_BA ' CB ' AC ' BA ' CB ' _ C ' response constitute.At first, at cycle a, the electric current of phase A is zero, and magnetic flux is from N to S.Because electric current is zero, on motor, there is not the net effect contribution with the arm of A response mutually.Speak of the B phase now, the electric current of phase B is for just, and magnetic flux is from N to S.Under B phase power drives, coil moved right under Lorentz force caused the B arm.Forward the coil arm to the response of C phase power supply now to, the electric current of phase C is for negative, and magnetic flux is from S to N.Lorentz force also causes coil to move right.Therefore, net effect is that motor 900 moves right.This process repeats 5 additional cycles b-f, and motor circulates in constantly at each that f travels forward as a result.Although the case representation of Figure 12 travels forward, motor can freedom forward, backward or keep motionless.

Figure 13 is illustrated in and cooperates an embodiment who has the linear motor in gap between the coil 1033 and 1035.Coil 1033 has top arm 1033a and end arm 1033b, and coil 1035 has top arm 1035a and end arm 1035b accordingly.Not to closely cooperate each other, the width of top arm 1033a and the spaced apart coil of top arm 1035a.Similar, the width of end arm 1033b and the also spaced apart coil of end arm 1035b,

result combinations coil

1033 and 1035 has the thickness of a coil at core, and has the thickness of three coils in the end.Figure 14 represents the sectional view of the motor winding winding of Figure 13.As previously mentioned, coil windings is 7 * 7 staple for electric wire arrays.

Here describe the present invention in detail and be in order to meet Patent Law, and provide the needed information of those skilled in the art to use new principle of the present invention and structure and use the special part that needs., should be appreciated that the present invention can use concrete different equipment and device to implement, and without departing from the scope of the invention, can carry out various changes to device specifics and method of operation.

Claims

1. polyphase winding assembly is characterized in that it comprises:

First coil, it has first top arm and end arm and the first hub of a spool part that comprises the first coil left arm and right arm on second plane in first plane;

Second coil, it has second top arm and end arm and the second hub of a spool part that comprises the second coil left arm and right arm on described second plane in described first plane, and the contiguous described first coil right arm of the described second coil left arm is arranged; And

Tertiary coil, it has the 3rd top arm and end arm and tertiary coil core in the 3rd plane, the tertiary coil core comprises tertiary coil left arm and right arm on described second plane, and place, the location of tertiary coil core comprises described first coil right arm and the described second coil left arm, described the 3rd top arm cooperates with described first, second top arm, and described the 3rd end arm cooperates with described first, second end arm;

The described core that described first, second, third coil is arranged to equal with thickness on second plane single coil thickness moves, and has the constant thickness that doubles described thickness when described each top arm cooperatively interacts and arm cooperatively interacts at each end.

2. polyphase winding assembly as claimed in claim 1 is characterized in that, each described coil is ' gull wing ' shape.

3. polyphase winding assembly as claimed in claim 1 is characterized in that, each described coil is bent twice.

4. polyphase winding assembly as claimed in claim 1 is characterized in that, each described coil has the knees of 45 degree, described top arm and end arm that it is connected respectively to this same coil with the described left arm and the right arm of each described coil.

5. polyphase winding assembly as claimed in claim 1 is characterized in that, the interval on described first plane and second plane is equivalent to half of described thickness.

6. polyphase winding assembly as claimed in claim 1 is characterized in that, described coil is arranged to move in the gap of magnetic field on vertically.

7. polyphase winding assembly as claimed in claim 1 is characterized in that, also comprises the interpole coil that is connected to described first coil, and the thickness of adjacent windings is identical with described thickness.

8. polyphase winding assembly as claimed in claim 1 is characterized in that, also comprises:

The 4th coil, it has the 4th top arm and end arm and the 4th hub of a spool part that comprises the 4th coil left arm and right arm on described second plane in described first plane, and the contiguous described second coil right arm of described the 4th coil left arm is arranged;

The 5th coil, it has the 5th top arm and end arm and the 5th hub of a spool part that comprises the 5th coil left arm and right arm on described second plane in described the 3rd plane, and the contiguous described tertiary coil right arm of described the 5th coil left arm is arranged;

The described core that described the first, second, third, fourth, the 5th coil is arranged to equal with thickness single coil thickness moves, and has the thickness that doubles described thickness when described each top arm cooperatively interacts and arm cooperatively interacts at each end.

9. polyphase winding assembly as claimed in claim 1 is characterized in that, also comprises a yoke, and described yoke has first notch that holds described coil block and second notch that can hold described second coil block.

10. polyphase winding assembly as claimed in claim 9, it is characterized in that, each notch has two relative faces, wherein each relative face also is included in a plurality of magnets that align in the row that constitute the magnet plane and have the longitudinal axis, and described magnet aligns with the lip-deep alternate pole orientation on described magnet plane.

11. a linear motor yoke assembly is characterized in that it comprises:

First coil block and second coil block, each coil block is formed by a plurality of coils; And

Housing, it has and is fit to hold described first and second coil blocks, longilineal first and second notches, wherein each elongate slot has two relative faces, each relative face is included in a plurality of magnets that align in the row and have the longitudinal axis, and described magnet aligns with the lip-deep alternate pole orientation on described magnet plane.

12. linear motor yoke assembly as claimed in claim 11 is characterized in that, also is included in the magnetic line of force that passes through the described magnet on described first and second notches in the single loop.

13. linear motor yoke assembly as claimed in claim 11 is characterized in that each coil block also comprises:

Tertiary coil, it has the 3rd top arm and end arm and tertiary coil core in the 3rd plane, the tertiary coil core comprises tertiary coil left arm and right arm on described second plane, and place, the location of tertiary coil core comprises the tertiary coil core of described first coil right arm and the described second coil left arm, described the 3rd top arm cooperates with described first, second top arm, and described the 3rd end arm cooperates with described first, second end arm;

14. linear motor yoke assembly as claimed in claim 12 is characterized in that described first and second notches comprise at least eight magnets, wherein, flux circuit passes eight magnets in the described single loop.

15. linear motor yoke assembly as claimed in claim 11 is characterized in that described housing is a W shape.

16. linear motor yoke assembly as claimed in claim 11 is characterized in that, described each coil block comprises that a thickness equals the core of single coil thickness, and each coil block has top and the bottom that thickness equals described thickness twice.

17. a linear motor is characterized in that it comprises:

First coil block and second coil block, each coil block comprises:

Second coil, it has second top arm and end arm and the second hub of a spool part that comprises the second coil left arm and right arm on described second plane in described first plane, and the contiguous described first coil right arm of the described second coil left arm is arranged; With

The described core that described first, second, third coil is arranged to equal with thickness on second plane single coil thickness moves, and has the constant thickness that doubles described thickness when described each top arm cooperatively interacts and arm cooperatively interacts at each end; And

Housing, it has two and is fit to hold described first coil block and second coil block, longilineal notch, wherein each elongate slot has two relative faces, each relative face also is included in a plurality of magnets that align in the row and have the longitudinal axis, and described magnet aligns with the lip-deep alternate pole orientation on described magnet plane.