CN107786062A - A kind of segmented cylinder-type transverse-flux linear motor - Google Patents
A kind of segmented cylinder-type transverse-flux linear motor Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
The invention discloses a kind of segmented cylinder-type transverse-flux linear motor, its composition includes：It is each to be mutually segmented primary (1,2,3) unshakable in one's determination, each mutually segmentation secondary iron core (4,5,6), each phase armature winding (7,8,9) and permanent-magnet pole (10)；Each phase armature winding (7,8,9) is wound in the core tooth of each phase segmentation primary (1,2,3) unshakable in one's determination and forms electric motor primary respectively, permanent-magnet pole (10) is laid on each phase segmentation secondary iron core (4,5,6) and forms motor secondary, it is characterised in that：Using phase segmental structure is pressed, each phase is segmented primary (1,2,3) unshakable in one's determination and is in fan-shaped column structure and it is pressed into the number of phases along motor circumference with each secondary iron core (4,5,6) that is mutually segmented for the linear electric motor primary and motor secondarymDecile is carried out, i.e., the radian of central angle shared by each phase is 2π/m, and it is filled with NULL (11) between each mutually segmentation.This kind of New-type electric machine has larger magnetomotive force, is advantageous to improve motor output, and then obtain higher pushing force density.
Description
Technical field
The invention belongs to machine field, and in particular to a kind of segmented cylinder-type transverse-flux linear motor.
Background technology
Linear motion system has a wide range of applications in the fields such as national defence, military project.With the development of science and technology, people
Higher and higher requirement is proposed to linear motion system, including pushing force density is big, control characteristic is flexible, simple in construction, manufacture
Easily etc..But make the power of linear electric motors for the linear electric motors of traditional magnetic structure, the mutual restriction of electric load and magnetic loading
Density refractory is to be fundamentally improved.In terms of high torque density electrical machine, horizontal magnetic field motor development in recent years is very fast.
The domestic research on horizontal magnetic pass permanent magnetic line electromotor at present is seldom, the Zou Jibin professors of Harbin Institute of Technology
And its student have studied using U-shaped core construction transverse flux cylinder type linear electric motors, electric machine structure is simple, but adjacent two-phase
Trough rim altogether between winding be present, the coupled problem of each phase winding be present, additionally due to twice of Neighboring primary core tooth unit interval is forever
Pole pitch, the utilization rate of permanent-magnet pole is not high and serious (Zou Jibin, Wang Qian, Zhang Hongliang the transverse flux linear motor electromagnetism of leakage field
The analysis of power and calculating [J] electrotechnics journals, 2007,22 (8)).The Kou Baoquan professors of Harbin Institute of Technology and its student
It has studied the plate and cylinder-type transverse-flux linear permanent magnet synchronous motor of two-way interlinkage, the tooth of the electric motor primary core unit
Away from equal to pole span, secondary permanent magnet can be made full use of, effectively reduces interelectrode magnetic leakage, but the electric machine structure is complicated and adjacent winding
One section of core tooth is shared, coupled problem be present between different windings, therefore, it is difficult to realize heterogeneous structure (Kou Baoquan, Yang Guolong, week
Tie up just, the two-way plate permanent magnet linear synchronous motor of interlinkage transverse magnetic flux [J] Proceedings of the CSEE of conspicuous, 2012,33:
75-81+178., Kou Baoquan, Yang Guolong, Li Peng, the base of a two-way interlinkage transverse flux cylinder type linear permanent magnet synchronous motor of conspicuous
Plinth research [J] Proceedings of the CSEEs, 2012,36:61-67+13.).
In a word, the existing transverse flux linear motor primary space availability ratio using core constructions such as traditional U-shaped, C-shapeds
Not high, the utilization rate of permanent magnet is relatively low, and permanent magnet interelectrode magnetic leakage is larger.In addition, they mostly also there is or it is complicated,
Processing difficulties, or the problems such as armature winding effective length ratio is not high, be also improved in power density and processing and manufacturing
Space.
For the above situation, the present invention proposes a kind of segmented cylinder-type transverse-flux linear motor technical scheme.
The content of the invention
Technical problem solved by the invention is to provide a kind of segmented cylinder-type transverse-flux linear motor, and it has
Higher permanent magnet utilization rate, permanent magnet interelectrode magnetic leakage is improved, and higher power density and pushing force density can be realized.
The technical solution for realizing the object of the invention is：
Segmented cylinder-type transverse-flux linear motor, its composition include：It is each to be mutually segmented primary iron core 1,2,3, each phase point
Section secondary iron core 4,5,6, each phase armature winding 7,8,9 and permanent-magnet pole 10；Each phase armature winding 7,8,9 is wound on each phase point respectively
Electric motor primary is formed in the core tooth of the primary iron core 1,2,3 of section, permanent-magnet pole 10 is laid in structure in each phase segmentation secondary iron core 4,5,6
Into motor secondary；Using phase segmental structure is pressed, each primary iron core 1,2,3 that is mutually segmented mutually divides with each for electric motor primary and motor secondary
It is carried out decile, i.e., the center of circle shared by each phase by section secondary iron core 4,5,6 in fan-shaped column structure and along motor circumference by number of phases m
The radian at angle is 2 π/m, and is filled with NULL 11 between each mutually segmentation.
It is each be mutually segmented primary iron core 1,2,3 by the primary yoke 101 unshakable in one's determination of each phase, 201,301, positioned at the primary yoke unshakable in one's determination of each phase
101st, 3 row on 201,301 are dislocatedly distributed the core tooth of arrangement, including in each phase outer core tooth 102,202,302 and each phase
Between the pole shoe of core tooth 103,203,303 and tooth ends unshakable in one's determination, include the pole of each end of phase outer core tooth 102,202,302
Boots 104,204,304 and the pole shoe 105,205,305 of each end of phase middle core tooth 103,203,303.
Each U-shaped and T-shaped core construction for being mutually segmented primary iron core 1,2,3 and being arranged alternately on direction of motion v, i.e., it is same
Layout pitch inside row core tooth be 2 permanent-magnet poles away from 2 τ, with the outer core tooth 102,202,302 and middle core of phase
Dislocation distance between tooth 103,203,303 is 1 permanent-magnet pole away from τ.
Between each difference of phase armature winding 7,8,9 coiling in each phase in core tooth 103,203,303.
The edge of pole shoe 104,204,304 of each end of phase outer core tooth 102,202,302 is perpendicularly to the direction of movement v to inner side
Extension is connected across on each end of phase outer core tooth 102,202,302 of two row and covers the surface of permanent-magnet pole 10, iron among each phase
The edge of pole shoe 105,205,305 of the end of heart tooth 103,203,303 is perpendicularly to the direction of movement v and extends over permanent-magnet pole 10 laterally
Surface.
Permanent-magnet pole 10 alternately magnetizes by N-S to be sequentially arranged in each phase segmentation secondary iron core 4,5,6, and m row permanent-magnet pole 10
Correspond to respectively m phases be segmented primary iron core 1,2,3, m phases be segmented secondary iron core 4,5,6 and m phases armature winding 7,8,9.
The m row permanent-magnet pole 10 that m phases are segmented in secondary iron core 4,5,6 is separately mounted to be dislocation arrangement along direction of motion v, and
Dislocation distance between any two row permanent-magnet pole 10 is 2 τ/m.
Compared with prior art, its remarkable advantage is the present invention：1) from principle, the magnetic flux plane of this kind of New-type electric machine
It is mutually perpendicular to the direction of motion, overcomes and caused be unfavorable for improving because electric load and magnetic loading spatially mutually restrict
The shortcomings that motor torque density, higher power density can be realized；2) from magnetic structure, electric motor primary submission unshakable in one's determination
U-shaped and T-shaped core construction for arrangement, the magnetic flux of the armature winding that interlinked as caused by permanent magnetic potential by outer core tooth and
Middle core tooth two parts to opposite polarity permanent-magnet pole produce jointly, there is larger magnetomotive force, be advantageous to improve electricity
Machine is contributed, and then obtains higher pushing force density；3) from by the sectional iron core being mutually segmented, the motor is respectively mutually segmented
Between independently of each other, and it is each be mutually segmented between be filled with NULL, realize each phase be segmented between magnetic insulation；4) from iron core
Seen in teeth portion structure, used tooth ends pole shoe unshakable in one's determination covering magnetic pole surfaces, the parts of pole shoe face magnetic pole surfaces have compared with
Big surface area, there is higher magnetic pole utilization rate, effectively reduce interelectrode magnetic leakage, and there is less air-gap reluctance in magnetic loop
With permanent-magnet pole magnetic resistance, more efficient energy conversion can be realized；5) from manufacturing process, the motor uses segmented cylinder type
Yoke unshakable in one's determination and staggered core tooth, both the new of machining can be used again by the way of traditional silicon steel plate stacking
Type soft-magnetic composite material (Soft Magnetic Composites, SMC) realizes that manufacturing process is simple, and armature winding knot
Structure is simple, can hand insertion, rule is simple；6) from application scenario, the control and regulation of the speed of service are simple, suitable for low
The direct drive occasion of fast high thrust.By adjusting voltage, frequency etc., different thrust and speed can be obtained, is had stronger
Flexibility.
Brief description of the drawings
Fig. 1 is the structural representation of the segmented cylinder-type transverse-flux linear motor；
Fig. 2 (a) is the front view and relative dimensions mark that the A phases of the segmented cylinder-type transverse-flux linear motor are segmented
Note；
Fig. 2 (b) is the A-A sectional views and relative dimensions that the A phases of the segmented cylinder-type transverse-flux linear motor are segmented
Mark；
Fig. 2 (c) is the B-B sectional views and relative dimensions that the A phases of the segmented cylinder-type transverse-flux linear motor are segmented
Mark；
Fig. 3 (a) is that the A phases of the segmented cylinder-type transverse-flux linear motor are segmented primary iron core；
Fig. 3 (b) is the A phase armature winding of the segmented cylinder-type transverse-flux linear motor；
Fig. 4 is that the A phases of the segmented cylinder-type transverse-flux linear motor are segmented motor secondary；
Fig. 5 is the expanded view of A, B and C three-phase segmentation motor secondary of the segmented cylinder-type transverse-flux linear motor；
Fig. 6 (a) is flux circuit figure of the segmented cylinder-type transverse-flux linear motor in the case of position 1；
Fig. 6 (b) is flux circuit figure of the segmented cylinder-type transverse-flux linear motor in the case of position 2；
Fig. 7 is the equivalent magnetic circuit modeling of the segmented cylinder-type transverse-flux linear motor；
Fig. 8 is the three-dimensional explosion schematic diagram of the segmented cylinder-type transverse-flux linear motor.
In figure：1 is that A phases are segmented primary iron core, and 2 be that B phases are segmented primary iron core, and 3 be that C phases are segmented primary iron core, and 4 be A phases
Secondary iron core is segmented, 5 be that B phases are segmented secondary iron core, and 6 be that C phases are segmented secondary iron core, and 7 be A phase armature winding, and 8 be B phase armatures
Winding, 9 be C phase armature winding, and 10 be permanent-magnet pole, and 11 be NULL, and 101 be the primary yoke unshakable in one's determination of A phases, and 201 be the primary iron of B phases
Heart yoke, 301 be the primary yoke unshakable in one's determination of C phases, and 102 be A phase outer core teeth, and 202 be B phase outer core teeth, and 302 be iron outside C phases
Heart tooth, 103 be A phase middle core teeth, and 203 be B phase middle core teeth, and 303 be C phase middle core teeth, and 104 be iron outside A phases
The pole shoe of heart tooth ends, 204 be B phase outer core tooth ends pole shoe, 304 be C phase outer core tooth ends pole shoe, 105
It is the pole shoe of B phase middle core tooth ends for the pole shoe of A phase middle core tooth ends, 205,305 be C phase middle core tooth ends
Pole shoe, v is the direction of motion.
Embodiment
The method for solving of general electromagnetic problems has analytic method and numerical solution.Analytic method includes magnetic equivalent circuit method and layering
Modelling；Magnetic equivalent circuit method is a kind of method of traditional solution motor-field, and motor is expressed by way of drawing magnetic circuit figure
Magnetic field, there is clear concept, calculate the characteristics of simple；Hierarchical mode method describes electromagnetic field with partial differential or integral equation, so
The methods of using the separation of variable afterwards direct solution, its application is typically limited to boundary condition simply and medium is linear field
Close.Numerical solution applicable surface is broader, can solve substantial amounts of Electromagnetic Field practical problem, modern age is with computer technology
Fast development, the proportion that numerical solution particularly FInite Element accounts in machine analysis is increasing.But FEM calculation
Required time is very long, and the dimensional Finite Element that particularly analyzing horizontal magnetic pass permanent magnetic line electromotor must use takes huge
Greatly, thus analytic method for analysis horizontal magnetic pass permanent magnetic line electromotor for and it is very important.Below based on motor in itself
Relation equation, related design of electrical motor experience and magnetic equivalent circuit method provide and solve the segmented cylinder-type transverse-flux straight-line electric
The technical scheme of machine approximate size parameter.
Segmented cylinder-type transverse-flux linear motor, its composition include：It is each to be mutually segmented primary iron core 1,2,3, each phase point
Section secondary iron core 4,5,6, each phase armature winding 7,8,9 and permanent-magnet pole 10；Each phase armature winding 7,8,9 is wound on each phase point respectively
Electric motor primary is formed in the core tooth of the primary iron core 1,2,3 of section, permanent-magnet pole 10 is laid in structure in each phase segmentation secondary iron core 4,5,6
Into motor secondary；Using phase segmental structure is pressed, each primary iron core 1,2,3 that is mutually segmented mutually divides with each for electric motor primary and motor secondary
It is carried out decile, i.e., the center of circle shared by each phase by section secondary iron core 4,5,6 in fan-shaped column structure and along motor circumference by number of phases m
The radian at angle is 2 π/m, and is filled with NULL 11 between each mutually segmentation.Technical scheme specific implementation is as follows：
1. key dimension parameter calculates
Power output equation is as follows：
In formula：Pout、UoAnd IoIt is the power output, output phase voltage and phase current of motor respectively；It is bearing power
Factor；M is the number of phases.
By specific electric load A definition, i.e., along the ampere-conductors in armature circumference unit length, it is known that
In formula：N is the number of turn that is often in series of armature winding；RinIt is the radius of armature circumference.
Define proportionality coefficient ku=E/Uo, E is unloaded terminal voltage.Power output in formula (1-1) can be defined as：
If specific magnetic loading of the motor when primary core tooth and secondary permanent-magnet pole face is Bg1, according to linear electric motors
Primary part armature winding encloses middle core number N of teethtWith enclosed primary core shoe area St, total magnetic linkage can be obtained and put down
Average is：
Φ=Nt·Bg1·St (1-4)
When the thickness of the NULL between each phase is segmented primary iron core between each mutually segmentation secondary iron core is ignored
When,
In formula：RinFor primary inside radius unshakable in one's determination, ltIt is primary core tooth along the length on direction of motion v.
Only consider the fundametal compoment of winding magnetic flux, derive the induced potential of the motor：
E=4KNmfNKwΦ (1-6)
In formula：KNmFor air-gap field waveform coefficient, 1.11 are equal to when air-gap field is Sine distribution；F is power frequency；
N is the number of turn that is often in series of armature winding；KwFor the winding coefficient of armature, the winding coefficient of this motor is 1；Φ is per phase magnetic
It is logical.
It can be obtained by (1-4)~(1-6) and f=v/ (2 τ)：
In formula：V is Rated motor linear velocity, τ be motor secondary permanent-magnet pole away from.
It is distributed from magnetic circuit during motor operation, the magnetic flux that middle core tooth is guided guides magnetic by outer core tooth
The sectional area that middle core tooth is considered when twice of flux, being uniformly distributed, therefore designing to ensure that the magnetic of motor internal is close is outside
Twice of core tooth sectional area.Due to length l of the core tooth along the direction of motiontIt is approximately equal to length of the permanent-magnet pole along the direction of motion
lpm, in the case where ensuring that middle core tooth and outer core tooth have same magnetic close, if the radian corresponding to middle core tooth
For α, then the α of the radian measure beta corresponding to outer core tooth=0.5.If radian measure gamma=β corresponding to primary core slots, then any phase is divided
Radian corresponding to the primary iron core of section or segmentation secondary iron core, i.e., the radian corresponding to primary yoke unshakable in one's determination or secondary iron core yoke are
By (1-3) and (1-7), it is known that：
If lt=α Rin, then
If δpm=0.2 τ, lpm≈lt=τ-δpm, have
In addition, also following relations：2 π=3m α=6m β=6m γ, the radian measure alpha corresponding to permanent-magnet polepm=3 α.In addition root
According to design of electrical motor experience, can obtain being segmented primary yoke thickness h unshakable in one's determinatione≈0.6Rinβ, it is segmented primary pole shoe thickness hb≈0.3Rinβ,
Gas length lg=0.5mm, groove depth hsCan be as parameter meters such as the radian measure gammas corresponding to required electric current I, copper factor and primary core slots
Obtain, tooth height h unshakable in one's determinationt=hs+hb, primary outer radius R unshakable in one's determinationout=Rin+ht+he.Thus the several of electric motor primary are obtained
Major parameter, additionally need to determine the major parameter of motor secondary, such as permanent-magnet pole thickness hpm, secondary iron core outer radius rout, it is secondary
Inside radius r unshakable in one's determinationinWith secondary iron core yoke thickness hr, wherein secondary iron core yoke thickness hrCan suitably it choose.As long as it is aware of hpm, just
Other unknown parameters can be obtained according to the restriction relation of motor geometrically, therefore in order to seek hpm, it is also necessary to establish as shown in Figure 7
Equivalent magnetic circuit modeling is analyzed.
2. equivalent magnetic circuit modeling
It is respectively flux circuit of the New-type electric machine in the case of diverse location as shown in Fig. 6 (a) and 6 (b).Counted to simplify
Calculate, ignore permanent-magnet pole leakage permeance, it is as shown in Figure 7 to obtain equivalent magnetic circuit modeling.Wherein, the magnetomotive force of permanent magnet is
FcN=FcS=Hchpm (1-12)
In formula：HcFor the coercivity of permanent-magnet pole；hpmFor the thickness of permanent-magnet pole.
RpmiAnd RpmoFor the magnetic resistance of permanent magnet；RrFor secondary iron core yoke portion magnetic resistance；RsFor primary rear of core magnetic resistance；RgiWith
RgoFor air-gap reluctance middle and between outer core tooth and permanent-magnet pole；RbiAnd RboRespectively middle core tooth and outer core
Tooth ends pole shoe magnetic resistance；RtiAnd RtoRespectively middle and outer core teeth portion magnetic resistance.
In formula：μ0、μpm、μfeIt is the magnetic conductivity of vacuum, permanent magnet and iron core respectively；lg、lpm、ltIt is respectively air gap length with τ
Degree, permanent-magnet pole the length of the direction of motion, core tooth the direction of motion length and permanent-magnet pole away from；α and β is respectively middle core
Radian corresponding to tooth and outer core tooth；hr、hpm、hb、hsAnd heRespectively secondary iron core yoke thickness, permanent-magnet pole thickness, iron core
The thickness of tooth ends pole shoe, tooth height unshakable in one's determination or groove depth and primary yoke thickness unshakable in one's determination；RinFor the primary inside radius unshakable in one's determination of segmentation.
Total magnetic resistance that flux circuit is can obtain by the magnetic conductance of (1-13)~(1-22) the flux circuit each several parts provided is
Rm=Rr+Rpmi+Rpmo+Rgi+Rgo+Rbi+Rbo+Rti+Rto+Rs (1-23)
Total magnetic resistance RmIn include two components：Known components Rm1With unknown components Rm2, respectively such as formula (1-24) and formula (1-
25) shown in
Rm1=Rgi+Rgo+Rbi+Rbo+Rti+Rto+Rs (1-24)
Equivalent magnetic circuit modeling as shown in Figure 7 can establish flux circuit equation
FCN+FCS=Φ Rm=Φ (Rm1+Rm2) (1-26)
Formula (1-24) and (1-25) are substituted into (1-26) can obtain the thickness h of permanent-magnet polepm。
Try to achieve the thickness h of permanent-magnet polepmAfterwards, the outer radius r of secondary iron core can be tried to achieveout=Rin-lg-hpm, secondary iron
The inside radius r of the heartin=rout-hr。
3. motor fabricates scheme
According to Fig. 1, the physical model of the novel flat-plate type transverse flux linear motor is mainly made up of following components：
The primary iron core 1 of three-phase segmentation, 2,3, three-phase segmentation secondary iron core 4,5,6, threephase armature winding 7,8,9 and three row permanent-magnet poles 10.
So that A phases are segmented as an example, provide A phases and be segmented shown in physical model such as Fig. 3 (a) of primary iron core 1, the entity mould of A phases armature winding 7
Shown in type such as Fig. 3 (b), the physical model that a row permanent-magnet pole 10 and A phases are segmented secondary iron core 4 is as shown in Figure 4.Wherein, A phases are segmented
Primary iron core 1 is by the core tooth of the primary row Heterogeneous Permutation of yoke 101 and three unshakable in one's determination of A phase, including two arrange the He of A phase outer cores tooth 102
One row A phase middle cores tooth 103, and the pole shoe of tooth ends unshakable in one's determination, include the He of pole shoe 104 of the end of A phase outer cores tooth 102
The pole shoe 105 of the end of A phase middle cores tooth 103, the permanent-magnet pole 10 that a row N-S alternately magnetizes are laid in A phases and are segmented secondary iron core 4
Upper surface.The plate transverse flux linear motor is simple in construction, easily manufactured, and two processing systems of the motor are given below
Make scheme：
Scheme one：
Although the A phases of the segmented cylinder-type transverse-flux linear motor are segmented primary iron core 1 by the primary yoke unshakable in one's determination of A phases
101 and three row Heterogeneous Permutation core tooth composition, but the basic cross section of the motor only has two kinds, respectively such as Fig. 2 (b) and 2
(c).Motor of the motor along direction of motion v two kinds of varying cross-section shapes can be respectively obtained by way of silicon steel plate stacking
Segmentation, and along direction of motion v laminate length be approximately a permanent-magnet pole away from τ, then by both varying cross-section shapes
Primary segmentation unshakable in one's determination alternately connection overlaps together and forms A phases and be segmented primary iron core 1；A phases 7 structures of armature winding are more simple
It is single, it can be wound on by way of hand insertion in a middle row core tooth；A phases, which are segmented secondary iron core 4, can also pass through silicon
The mode that steel disc laminates obtains, and the row N-S permanent-magnet poles 10 alternately to magnetize finally are laid in into A phases is segmented the upper of secondary iron core 4
Surface.
Scheme two：
Except that by the way of silicon steel plate stacking, soft-magnetic composite material can also be used to carry out machining.Pass through first
The mode of machining obtains the primary row core tooth of yoke 101 and three unshakable in one's determination of A phases, then slots and obtain on the primary yoke 101 unshakable in one's determination of A phases
Core slots of three row Heterogeneous Permutations, and the layout pitch of same row core slots is two permanent-magnet poles away from 2 τ, outer core groove and in
Between dislocation distance between core slots be a permanent-magnet pole away from τ；Then three row core tooths are imbedded on the primary yoke 101 unshakable in one's determination of A phases
Three row core slots in；A phases armature winding 7 is wound on by way of hand insertion in a middle row core tooth；A
Mutually segmentation secondary iron core 4 can also be obtained by soft-magnetic composite material machining, the permanent-magnet pole that finally a row N-S alternately magnetizes
10 are laid in the upper surface that A phases are segmented secondary iron core 4.
4. the detent force analysis of transverse flux linear motor
Detent force is larger to the performance impact of transverse flux linear motor, and its presence can make the thrust of motor that ripple occur
It is dynamic, so as to produce vibration and noise；And when the frequency of detent force is consistent with the mechanical resonance frequency of stator or mover, vibration
It will be also exaggerated with noise.The presence of detent force equally have impact on motor low-speed performance in the controls and be controlled in position
High accuracy positioning in system.Thus it is necessary to analyze the detent force of transverse flux linear motor.
The mechanism of production of horizontal magnetic field motor detent force and the mechanism of production of conventional permanent magnet motor location torque be it is the same,
But due to the particularity of its structure so that the detent force cycle of horizontal magnetic field motor is different from conventional motors, below emphatically to it
Analyzed.
The number of the preferable Cogging Torque of traditional permanent magnet rotating machine is motor pole number 2P and slot number Z least common multiple
Number.For transverse flux linear motor, due to being separated by twice of pole span between each stator component of motor, if ignoring the edge effect of motor
Should, it is believed that it is the electric rotating machine that a radius is infinity, number of poles 2N, slot number are N, and wherein N tends to be infinitely great.According to
Knowable to the theory of conventional motors location torque is analyzed, the detent force number of transverse flux linear motor is 2N, namely positioning
The power cycle is τ, and wherein τ is the pole span of motor.
Analysis above is only applicable to single-phase transverse flux linear motor.For three-phase structure, following two feelings can be divided into
Condition：
(1) transverse flux linear motor three-phase Striking symmetry, spatially 120 ° of electrical angles of mutual deviation
Fourier decomposition is carried out to detent force caused by motor three-phase, can be obtained：
Wherein, x is the position where electric mover.
Now general orientation power is caused by transverse flux linear motor
Therefore it is for the transverse flux linear motor of three-phase symmetrical, its detent force cycle
(2) transverse flux linear motor asymmetrical three-phase
If b phases are θ with the spatially poor electrical angle of a phasesab, c phases are θ with the spatially poor electrical angle of a phasesac,
Fourier decomposition is carried out to detent force caused by motor three-phase, can be obtained：
NowTherefore the detent force of motor
Cycle is τ.
5. the lifting scheme of electromagnetic force
One of the common concern, its reason why transverse flux linear motor obtains people is exactly that it can be provided than passing
The much bigger force density of system linear electric motors.The special construction of transverse flux linear motor allows to by increasing motor number of pole-pairs
To improve the force density of motor.Below principle is lifted to analyze the electromagnetic force of transverse flux linear motor.
Fig. 2 (a) gives the front view of the motor.In the case of outside motor size constancy, the pole span τ of motor is subtracted
Half, so that motor pole number doubles, correspondingly, stator lasmination number also doubles.
It is can be found that by research：Ensureing the mechanical movement speed v of motormOn the premise of constant, if by mover permanent magnetism
Number of pole-pairs doubles, and in the case where not considering leakage field, the size for the magnetic flux crossed per circle conductor institute chain is constant, but its rate of change
But one times is added, thus is doubled per opposite potential.So, in the case where motor electric load is constant, the electromagnetism of motor
Power will also double.Due toSo FemDouble, the electromagnetism force density of motor is carried
It is high.
But in fact, while mover number of pole-pairs is increased, leakage field also can correspondingly increase in motor, so that in motor
Main flux reduce, winding induced electromotive force also can reduce correspondingly.Therefore the increase of number of pole-pairs has an individual limit, i.e., until it
Untill increase no longer makes back-emf increase.In addition, the increase of number of pole-pairs will cause the drop of transverse flux linear motor power factor
It is low.Therefore when designing transverse flux linear motor, the selection of number of pole-pairs need to take into account simultaneously electromagnetism force density and power factor this
Two indexs.Under certain conditions, in order to obtain a higher power factor, it is necessary to sacrifice the electromagnetism force density of motor
For cost.In summary, when motor number of pole-pairs increase, for transverse flux linear motor, in certain scope, electromagnetic force
Density correspondingly increases.
6. the mathematical modeling of transverse flux linear motor
In order to carry out the performance evaluation of motor and Control System Design, it is necessary to establish the novel flat-plate type transverse flux linear
The mathematical modeling of motor.Because transverse flux motor is one kind of synchronous motor, thus synchronous motor can be copied to carry out laterally
The modeling of flux linear motor.But when needing meter and the factor such as magnetic field saturation and armature-reaction, transverse flux linear motor
Mathematical modeling just become complex, now need to consider the non-of phase relation and inductance between winding back-emf and electric current
It is linear to wait caused influence.A kind of relatively good method is exactly to be carried out according to the relation curve between motor magnetic linkage and electric current
The modeling of transverse flux linear motor, magnetic linkage caused by magnet steel is represented by introducing the concept of " magnet steel equivalent current ", from
And it can easily obtain the mathematical modeling of motor.
In motor unsaturation, it is linear relationship between magnetic linkage and electric current that can be approximately considered caused by armature supply, this
When winding inductance be a constant.Due to being regarded as decoupling mutually between each phase of transverse flux linear motor, thus can be only to it
In a phase analyzed, in the case where not considering edge effect, can obtain the flux linkage equations of transverse flux linear motor and electricity
Press shown in equation such as formula (1-30).
In formula：λmpmFor the peak value of magnetic linkage caused by permanent magnet；LaFor winding inductance (when unsaturated)；λ be motor in forever
Total magnetic linkage caused by magnet and armature supply；The electric current that i is flowed through by armature winding；θ is the equivalent electric angle where mover
Degree,Position when x=0 is defined as into the magnetic flux maximum of institute's linkage in stator component where mover；r
For the resistance of armature winding；U is winding applied voltage.
Carry out steady-state analysis, should determine that the waveform of armature supply first.Because the magnetic linkage of machine winding is substantially by remaining
String rule changes, in order to which the power for ensureing to input motor in a cycle is that just armature supply should have following functional form:
I=-Im sin(θ+θt) (1-31)
Wherein
First formula of (1-30) and (1-31) are substituted into (1-30) second formula, and are converted into phasor shape
Formula, can obtain voltage equation is：
In formula：For terminal voltage phasor, For winding induced electromotive force phasor, For armature
Electric current phasor,θtFor phasorWithBetween angle, referred to as angle of torsion；XaFor the induction reactance of armature winding, Xa=
ωLa。
Further simplify, can obtain
This does not consider voltage equation during transverse flux linear motor steady-state operation during saturation as.As can be seen that the party
The voltage equation of journey and implicit pole synchronous motor is quite similar, and this is also synchronous from other side explanation transverse flux linear motor
One kind of motor, thus the analysis method of synchronous motor can be copied to study transverse flux linear motor, this is for horizontal stroke
Performance evaluation and control strategy research to flux linear motor have great importance.It is straight for the transverse magnetic flux of other structures
Line motor, such as magneticfocusing structure, when d-axis reactance and unequal quadrature axis reactance, it can use and be similar to hybrid permanent magnet type synchronization
The voltage equation of motor carries out the steady-state analysis of transverse flux linear motor, repeats no more here.
When needing the influence of meter and saturation, the amplitude of magnetic linkage caused by permanent magnet is no longer a constant, but electric
Pivot electric current i and angle of torsion θtFunction；Meanwhile armature inductance LaAlso it will change with the change of motor degree of saturation, be armature electricity
Flow i and angle of torsion θtFunction.These all cause the modeling of transverse flux linear motor to become complicated, and now (1-33) is represented
Voltage equation no longer be applicable, other methods must be considered as to establish the mathematical modeling of transverse flux linear motor.
In fact, because the relative permeability of permanent magnetic steel is close to 1, transverse flux linear motor can be regarded as hidden
Pole motor, thus motor magnetic linkage and its shape of the relation curve of armature supply are essentially identical when mover is in diverse location, it
Can be by translating mutually to obtain along transverse axis.
When θ=90 °, magnet steel magnetic linkage caused by armature winding be 0, now in motor total magnetic linkage and electric current relation
Curve can be represented with multinomial：
By the way that the curve is translated, the relation of motor magnetic linkage and electric current when mover is in diverse location that can obtain is：
In formula, isIt is the electric current relevant with permanent magnetic steel, is defined as " magnet steel equivalent current ".
When armature supply is 0, the magnetic linkage in motor produces by magnet steel, now isMeet
It can be seen that isIt is rotor position angle θ function, that is to say rotor position x function, its big I passes through formula (1-36)
It is determined that.
So, equation below can be obtained：
This is to consider motor saturation and the mathematical modeling of transverse flux linear motor during armature-reaction.Using the model,
Easily the runnability of motor can be analyzed.
Claims (7)
1. a kind of segmented cylinder-type transverse-flux linear motor, its composition includes：Each be mutually segmented primary (1,2,3) unshakable in one's determination, each
Mutually segmentation secondary iron core (4,5,6), each phase armature winding (7,8,9) and permanent-magnet pole (10)；Each phase armature winding (7,8,9) is respectively
It is wound in the core tooth of each phase segmentation primary (1,2,3) unshakable in one's determination and forms electric motor primary, permanent-magnet pole (10) is laid in each phase segmentation
Secondary iron core forms motor secondary on (4,5,6), it is characterised in that：The linear electric motor primary and motor secondary, which use, presses phase
Segmental structure, it is each to be mutually segmented primary (1,2,3) unshakable in one's determination with each secondary iron core (4,5,6) that is mutually segmented in fan-shaped column structure and edge
It is carried out decile by motor circumference by number of phases m, i.e., the radian of central angle shared by each phase is 2 π/m, and is filled between each mutually segmentation
NULL (11).
2. segmented cylinder-type transverse-flux linear motor according to claim 1, it is characterised in that：It is each to be mutually segmented primary
(1,2,3) unshakable in one's determination are by each phase primary yoke (101,201,301) unshakable in one's determination, 3 on the primary yoke (101,201,301) unshakable in one's determination of each phase
Row are dislocatedly distributed the core tooth of arrangement, including each phase outer core tooth (102,202,302) and each phase middle core tooth (103,
203rd, 303) and tooth ends unshakable in one's determination pole shoe, including each phase outer core tooth (102,202,302) end pole shoe (104,
204th, 304) and each phase middle core tooth (103,203,303) end pole shoe (105,205,305).
3. segmented cylinder-type transverse-flux linear motor according to claim 1 or 2, it is characterised in that：It is each to be mutually segmented
The U-shaped and T-shaped core construction that primary iron core (1,2,3) is arranged alternately on direction of motion v, i.e., inside same row core tooth
Layout pitch is 2 permanent-magnet poles away from 2 τ, with phase outer core tooth (102,202,302) and middle core tooth (103,203,
303) dislocation distance between is 1 permanent-magnet pole away from τ.
4. segmented cylinder-type transverse-flux linear motor according to claim 1, it is characterised in that：The linear electric motors
Each phase armature winding (7,8,9) respectively between coiling in each phase in core tooth (103,203,303).
5. segmented cylinder-type transverse-flux linear motor according to claim 1 or 2, it is characterised in that：Outside each phase
The pole shoe (104,204,304) of core tooth (102,202,302) end is connected on two along being perpendicularly to the direction of movement v and extended across to inner side
Arrange on each phase outer core tooth (102,202,302) end and cover the surface of permanent-magnet pole (10), each phase middle core tooth (103,
203rd, 303) pole shoe (105, the 205,305) edge of end is perpendicularly to the direction of movement the table that v extends over permanent-magnet pole (10) laterally
Face.
6. segmented cylinder-type transverse-flux linear motor according to claim 1, it is characterised in that：Permanent-magnet pole (10) is pressed
N-S, which alternately magnetizes, to be sequentially arranged on each phase segmentation secondary iron core (4,5,6), and m row permanent-magnet pole (10) corresponds to m phases and is segmented respectively
Primary iron core (1,2,3), m phases are segmented secondary iron core (4,5,6) and m phases armature winding (7,8,9).
7. the segmented cylinder-type transverse-flux linear motor according to claim 1 or 6, it is characterised in that：Install respectively
It is dislocation arrangement in the m row permanent-magnet pole (10) that m phases are segmented in secondary iron core (4,5,6) along direction of motion v, and any two row permanent magnetism
Dislocation distance between pole (10) is 2 τ/m.
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| CN113300564A (en) * | 2021-06-11 | 2021-08-24 | 哈尔滨工业大学 | High-power-factor transverse flux permanent magnet synchronous linear motor |
| CN113300566A (en) * | 2021-06-11 | 2021-08-24 | 哈尔滨工业大学 | Modularized transverse flux permanent magnet synchronous linear motor |
| CN117318432A (en) * | 2023-11-29 | 2023-12-29 | 湖南天友精密技术有限公司 | Dynamic magnetic type permanent magnet motor and control method |
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