CN207283373U - A kind of permanent magnet synchronous motor - Google Patents
A kind of permanent magnet synchronous motor Download PDFInfo
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- CN207283373U CN207283373U CN201721212477.1U CN201721212477U CN207283373U CN 207283373 U CN207283373 U CN 207283373U CN 201721212477 U CN201721212477 U CN 201721212477U CN 207283373 U CN207283373 U CN 207283373U
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Abstract
The utility model discloses a kind of permanent magnet synchronous motor, it is related to electric machine structure technical field, including stator and rotor, stator is provided with the first stator unit, first stator unit includes insulation framework, coil and the first stator core, insulation framework includes the first fixed frame and the second fixed frame being connected with the first fixed frame, the first fixed frame and the second fixed frame are mounted in the first stator core, and coil is installed on the first fixed frame and the second fixed frame；Rotor is provided with magnet assembly, and magnet assembly includes the first permanent magnet, the second permanent magnet, three permanent magnet and the 4th permanent magnet installed successively, gap is equipped between rotor and stator, and be installed in motor with stator.By the way that the stator of magneto is used modular construction, insulation framework can be directly installed in the first stator core, and coil is wrapped in insulation framework again so that loop length is reduced, and is reduced material cost, is increased the torque output capability of motor.
Description
Technical field
It the utility model is related to electric machine structure technical field, more particularly to a kind of permanent magnet synchronous motor.
Background technology
At present, numerical control rotating platform is the core functional components of Modern NC Machine Tool, is mainly used for matching with lathe, is completed
The various functions of lathe, ensure the abundant use of lathe basic function, while are expanding the use processing performance of lathe, using model
Enclose, ensure machining accuracy, improve production efficiency, reduce labor intensity etc. all plays an important role.
According to the structural principle of numerical control rotating platform, product currently on the market can be divided into two classes, one kind is using servo electricity
Machine drives the structure of worktable rotary by mechanical variable speed devices such as worm gear, worm screws；Another kind of is exactly numerical control electricity turntable, it will
Torque motor technology is integrated with turntable technology height, is directly driven using torque motor to complete rotary motion, currently, domestic number
Control table servo system still mainly adds gear-driven type of drive using high-speed servo motor, since there is machine driving
Chain, possesses preferable static rigidity, still, the operations such as this feeding mode will be completed to start, accelerate, slow down, invert and stop
When, elastic deformation, friction and backlass of generation etc. cause that mechanical oscillation are big, motor imagination is slow, dynamic rate is poor and other
Nonlinearity erron, thus it is difficult to realize high-precision processing.One of approach to solve the above problems is exactly to use direct driving technologies
Realize " Zero-drive Chain ", directly cancel middle mechanical speed mapping device, will load and the rotor of motor is connected directly, control
Object is the same as being made of one of motor.
Numerical control rotating platform is especially focused on torque factor, therefore it drives " flat " knot of the motor common design for major diameter
Structure, the permanent magnet synchronous motor of traditional numeric-control turntable are generally made of stator and rotor, and wherein stator by stator core and embeds
Stator coil composition in stator core；Stator core is to laminate into one as needed by some identical circular ring-shaped stator punching sheets
Determine thickness；Stator punching can be described as cutting or be punched out some line embedding grooves above a circular ring shape.
But the stock utilization of the torque motor of this " flat " is very low, wherein beyond stator core circumference and
Intermediate disc part just slatterns, further, since stator punching is processed on whole circular ring structure under normal conditions
The structure of line embedding groove, has certain technology difficulty in causing toward wire casing during embedded copper coil, therefore in order to successfully by copper
Line is imbedded in wire casing, and the axial length of copper coil is more much larger than the thickness of stator core, this equally causes the wave of copper wire
Take, since the length of copper coil becomes larger, the resistance value of stator coil also accordingly becomes larger, due to coil electricity when electrical power works
Becoming larger for resistance value and easily cause temperature to rise rapidly, cause the torque output capability of torque motor to be restricted.
Utility model content
For overcome the deficiencies in the prior art, the purpose of this utility model is that solving the material use of current torque motor
Rate is very low, the technical problem for causing the torque output capability of torque motor to be restricted.
The utility model adopts the following technical solution realizes：
The utility model provides a kind of permanent magnet synchronous motor, including：
Stator, the stator are provided with the first stator unit, and first stator unit includes insulation framework, coil and the
One stator core, the insulation framework includes the first fixed frame and the second fixed frame being connected with first fixed frame, described
First fixed frame is mounted in first stator core with second fixed frame, and it is solid that the coil is installed on described first
Determine on frame and the second fixed frame；
Rotor, the rotor are provided with magnet assembly, the first permanent magnet that the magnet assembly includes installing successively, second
Permanent magnet, three permanent magnet and the 4th permanent magnet, are equipped with gap between the rotor and the stator, and are installed with the stator
In in motor.
Further, the stator includes supporting rack, and support frame as described above includes the first pressing plate and between first pressing plate
Every the second pressing plate of setting, the first stator core both ends are connected with first pressing plate and the second pressing plate respectively.
Further, the first back-shaped chamber, first fixed frame and described second are provided with first stator core
Fixed frame is mounted on the described first back-shaped chamber.
Further, the first wire casing is provided with first fixed frame, the second line is provided with second fixed frame
Groove, first wire casing form the second back-shaped chamber with second wire casing, and the coil is installed on the described second back-shaped intracavitary.
Further, first fixed frame is additionally provided with first raised and the first groove, phase on second fixed frame
Corresponding to be additionally provided with second raised and the second groove, first protrusion is inserted to raised slotting in second groove, described second
As for first groove.
Further, the stator further includes fastener, and first through hole, second pressure are provided with first pressing plate
The second through hole is provided with plate, third through-hole is additionally provided with first stator core, the fastener passes through described second
Through hole, third through-hole and first through hole, by first stator core be fixed on first pressing plate and second pressing plate it
Between.
Further, the stator further includes the second stator unit, and second stator unit includes the second stator core,
First connecting portion is additionally provided with first stator core, is additionally provided with second stator core and is connected with described first
The second connecting portion of portion's connection.
Further, the stator further includes connecting block, and the first connecting portion and the second connecting portion are groove,
Described connecting block one end is inserted in the first connecting portion, and the other end is inserted in the second connecting portion.
Further, first permanent magnet and the same magnetic pole of the three permanent magnet may be contained within same direction, institute
The same magnetic pole for stating the second permanent magnet and the 4th permanent magnet may be contained within same direction, second permanent magnet and described the
The setting direction of the same magnetic pole of one magnetic field of permanent magnet is opposite.
Further, first permanent magnet is identical with the second permanent magnet angle of inclination, the three permanent magnet with
The 4th permanent magnet angle of inclination is identical, and first permanent magnet is opposite with the three permanent magnet angle of inclination.
Compared with prior art, the beneficial effects of the utility model are：
By the way that the stator of torque motor is used modular construction, insulation framework can be directly installed on the first stator core
On, coil is wrapped in insulation framework again, and the loop length in the first stator unit is reduced, and is reduced material cost, is increased
The torque output capability of torque motor.
Brief description of the drawings
Fig. 1 is the permanent magnet synchronous motor cross-sectional view in the utility model；
Fig. 2 is the structure diagram of stator；
Fig. 3 is the structure diagram that the first stator unit is installed on supporting rack；
Fig. 4 is the explosive view of one embodiment in Fig. 3；
Fig. 5 is the explosive view of another embodiment in Fig. 3；
Fig. 6 is the explosive view of insulation framework；
Fig. 7 is the schematic diagram in first one face of stator core in Fig. 4；
Fig. 8 is the schematic diagram in first one face of stator core in Fig. 5；
Fig. 9 is the structure diagram in one face of rotor；
Figure 10 is the structure diagram in one face of traditional stator；
Figure 11 is the air-gap field of rectangular wave；
Figure 12 is the air-gap field of trapezoidal wave；
Figure 13 is the suppression Finite Element Simulation Analysis figure of cogging torque；
Figure 14 is the air-gap field of motor；
Figure 15 is the fft analysis figure of air gap magnetic density waveform；
Figure 16 is the back-emf sinogram of motor；
Figure 17 is the back-emf fft analysis figure of motor；
Figure 18 is permanent magnet synchronous motor accuracy test figure.
In figure：
10th, stator；11st, the first stator unit；111st, insulation framework；1111st, the first fixed frame；11111st, the first wire casing；
11112nd, first is raised；11113rd, the first groove；1112nd, the second fixed frame；11121st, the second wire casing；11122nd, second is raised；
11123rd, the second groove；112nd, coil；113rd, the first stator core；1131st, the first back-shaped chamber；1132nd, third through-hole；1133、
First connecting portion；1134th, second connecting portion；1135th, third protrusion；1136th, the 3rd groove；12nd, supporting rack；121st, the first pressure
Plate；1211st, first through hole；122nd, the second pressing plate；1221st, the second through hole；13rd, fastener；131st, bolt；132nd, nut；14th,
Two stator units；15th, connecting block；20th, rotor；21st, rotor yoke；22nd, magnet assembly；221st, the first permanent magnet；222nd, second forever
Magnet；223rd, three permanent magnet；224th, the 4th permanent magnet；30th, housing.
Embodiment
In the following, with reference to attached drawing and embodiment, the utility model is described further, it is necessary to explanation is,
On the premise of not colliding, it can be formed in any combination between various embodiments described below or between each technical characteristic new
Embodiment.
As shown in figs 1-9, the utility model discloses a kind of permanent magnet synchronous motor, the permanent magnet synchronous motor to include stator 10
And rotor 20, the first stator unit 11 is provided with stator 10, and the structure of each stator unit is identical, the first stator unit 11
Including insulation framework 111,112 and first stator core 113 of coil, the first stator core 113 and other stator core structures
All identical, insulation framework 111 includes the first fixed frame 1111 and the second fixed frame 1112 being connected with the first fixed frame 1111, the
One fixed frame 1111 and the second fixed frame 1112 are mounted in the first stator core 113, and coil 112 is installed on the first fixed frame
1111 and second on fixed frame 1112.
Multiple magnet assemblies 22 that rotor yoke 21 is provided with rotor 20 and is installed on rotor yoke 21, in CNC milling machine
On along the excircle of rotor yoke 21 be machined with multiple locating slots, then magnet assembly 22 is installed on 21 external peripheral surface of rotor yoke
On, the depth of locating slot is permanent magnetism body thicknessThe angle of inclination of locating slot is to be axially formed diclinic slot form, rotor yoke
21 making material is 8# steel or 10# steel, and magnet assembly 22 includes the first permanent magnet 221, the second permanent magnet installed successively
222nd, 223 and the 4th permanent magnet 224 of three permanent magnet, is equipped with gap between rotor 20 and stator 10, and is installed on stator 10
In the housing 30 of motor, permanent magnet material be typically chosen the trade mark be N48UH sintered NdFeB, permanent magnet material surface need into
Row electrogalvanizing protective treatment, all permanent magnets are connected together with rotor yoke 21 by the way that high-strength bi-component epoxy cement is gluing,
After the completion of permanent magnet is Nian Jie with rotor yoke 21, precompressed is carried out to permanent magnet by specific purpose tool, and is kept for the suitable time, makes to glue
Glue is connect fully to cure, permanent magnet is strongly adhered to rotor yoke 21 together with.
By the way that the stator 10 of torque motor is used modular construction, it is fixed that insulation framework 111 can be directly installed on first
On sub- iron core 113, coil 112 is wrapped in insulation framework 111 again, and 112 length of coil in the first stator unit 11 will be than passing
112 length of coil of system will be lacked, and so not only reduce material cost, and increase the torque output capability of torque motor.
Stator 10 includes supporting rack 12, supporting rack 12 include the first pressing plate 121 and with the first pressing plate 121 spaced the
Two pressing plates 122,113 both ends of the first stator core are connected with the first pressing plate 121 and the second pressing plate 122 respectively, the first pressing plate 121 and
Second pressing plate, 122 structure is identical, and is circular ring shape, and the effect of the first pressing plate 121 and the second pressing plate 122 is fixed stator iron
The heart.
The first back-shaped chamber 1131, the first fixed frame 1111 and the second fixed frame 1112 are provided with first stator core 113
It is mounted in the first back-shaped chamber 1131, wherein, the first fixed frame 1111 is inserted into from 113 front end of the first stator core, and second is solid
Determine frame 1112 to be inserted into from 113 rear end of the first stator core, directly insulation framework 111 can be installed in stator core.
The first stator core 113 in the present embodiment is folded vertically by the identical multiple stator punchings of shape and size
Pressure forms, and the material for making stator punching is electrical sheet, can pass through self-clinching, welding or the shape of riveting between multiple stator punchings
Formula is made into one, and coil 112 is generally formed by single or more round enameled wire coiling, can also be by single or more flat paint
Envelope curve coiling forms, and enameled wire is copper wire, and the form and method of 112 coiling of coil are identical with 112 coiling of conventional coil,
Since coil 112 employs the processing technology of direct coiling, the groove of motor can be further improved by selecting flat enameled wire
Full rate, and then lift the torque density of motor, the performance of expanded motor.
Insulation framework 111 is to be formed by bakelite powder material through die casting, and bakelite powder material preferentially selects PF2A4 phenolic molding compounds
Expect, the first wire casing 11111 is provided with the outside of the first fixed frame 1111, and the outside of the second fixed frame 1112 is provided with the second wire casing
11121, the first wire casing 11111 and the second wire casing 11121 form the second back-shaped chamber, and coil 112 is installed on the second back-shaped intracavitary, will
Coil 112 is directly wound in insulation framework 111, makes the length of coil 112 can at most reduceCopper wire is saved, due to line
The length of circle 112 reducesSo as to which in motor radiating ability, under the same conditions, motor output torque will improveTimes, tool
The algorithm of body is as follows：
As shown in Figure 10, traditional unitary stator punching form annular in shape, it is S that it, which is punched area,1=L1×L2, consider
It is believed that having after processing factors：
L1=L2≈D1 [1]
Wherein：
D1--- 10 outside diameter of stator；
It can find out from Fig. 2 and Fig. 3 again, stator punching punching area is S2=L3×L4, wherein：
Wherein：
Di--- 10 internal diameter of stator；
Q --- stator core number.
Simultaneous [1], [2], have：
In this case, as Q=24, L1=L2≈7.64L3。
Usually, Di＜ ＜ D1, in this case,Vertical [1], [3] are connected firmly, are had：
L1=L2≈8.33L4 [5]
Again because stator core is made of multiple stator punching pieces, it is therefore desirable to the gross area of the electrical sheet material of punching
For：
S3=Q × L3×L4 [6]
Unitary stator punching and the relation of assembled piece type punching have：
Can be, it is evident that stator punching of the same area, electrical sheet needed for overall punching be assembled piece type from [7] formula
2.65 times, the material economy effect of assembled piece type structure is very notable.
Further, theoretical calculation is carried out to Figure 10 shown in this case and Fig. 2, finds the effective rate of utilization of material in Figure 10
It is 45% for stock utilization in 15%, Fig. 2.
Stator punching is the structure that line embedding groove is processed on whole circular ring structure under normal conditions, therefore toward in wire casing
There is certain technology difficulty during embedding copper wire, in order to which successfully copper wire is imbedded in wire casing, the axial length of copper coil 112
LcuThan the thickness L of stator coreFeIt is much larger.But stator core is independent modular organization, coil 112 can be independent
It is wrapped in stator core, if this case is in the case of the identical number of turn, the total length of copper wire is compared to reducingAccording to Electrical Motor
Principle：
Wherein：
R --- motor phase resistance；
ρ --- copper wire resistivity；
L --- copper wire total length；
S --- copper section accumulates.
From [8], when L is shortenedSimilarly the resistance R of motor is also reduced
Copper olse consumption calculation formula be：
Pcu=mi2R [9]
Wherein：
Pcu--- copper olse consumes；
M --- the number of phases；
I --- phase current；
As it can be seen that when identical in the radiating condition of motor, pouring into the electric current i of motor can increaseTimes, and according to Electrical Motor
Principle：
Wherein：
Tem--- motor electromagnetic torque；
--- motor magnetic flux；
As it can be seen that the output torque of motor can similarly be liftedTimes, the torque density of motor further gets a promotion.
As preferred embodiment, the first fixed frame 1111 is additionally provided with the first protrusion 11112 and the first groove
11113, corresponding on 1112 both sides of the second fixed frame to be additionally provided with the second protrusion 11122 and the second groove 11123, first fixes
Frame 1111 is identical structure with the second fixed frame 1112, and when assembling insulation framework 111, the first fixed frame 1111 and second is fixed
Frame 1112 is relatively interspersed, and the first protrusion 11112 is inserted to be inserted in the first groove in the second groove 11123, the second protrusion 11122
11113, insulation framework 111 is fit together completely with the first stator core 113.
As preferred embodiment, stator 10 further includes fastener 13, and first through hole is provided with the first pressing plate 121
1211,1211 number of first through hole is multiple, and is uniformly distributed in the circumferential surface of the first pressing plate 121, is set on the second pressing plate 122
The second through hole 1221 is equipped with, 1221 number of the second through hole is multiple, and is uniformly distributed in the circumferential surface of the second pressing plate 122, the
It is additionally provided with third through-hole 1132 in one stator core 113, fastener 13 is through the second through hole 1221, third through-hole 1132 and the
One through hole 1211, the first stator core 113 is fixed between the first pressing plate 121 and the second pressing plate 122, fastener 13 is unnecessary
Part is with 112 leading-out terminal of coil and end of incoming cables in the same side.
Fastener 13 includes bolt 131 and nut 132, and bolt 131 is through the second through hole 1221, third through-hole 1132 and the
One through hole 1211, and bolt 131 is threadedly connected to nut 132, the connection of bolt 131 can increase the first stator core 113 and prop up
Stability on support 12, reduces due to the probability that motor shakes and loosens fastener 13.
Stator 10 further includes the second stator unit 14, and the second stator unit 14 includes the second stator core, two neighboring fixed
Connection mode between sub- iron core has two kinds of embodiments：
Embodiment one：First connecting portion 1133 is additionally provided with first stator core 113, is also set in the second stator core
The second connecting portion 1134 being connected with first connecting portion 1133 is equipped with, adjacent two stator cores pass through first connecting portion 1133
And second connecting portion 1134 is mutually twisted close structure and is combined together, the first stator core 113 is phase with the second stator core
Same structure, i.e. first connecting portion 1133 are respectively arranged at 113 both sides of the first stator core with second connecting portion 1134, and first connects
Socket part 1133 is third protrusion 1135, and second connecting portion 1134 is the 3rd groove 1136.
Embodiment two：Stator 10 further includes connecting block 15, and first connecting portion 1133 is recessed with second connecting portion 1134
Groove, 15 one end of connecting block are inserted in first connecting portion 1133, and 15 other end of connecting block, which is inserted in second connecting portion 1134 and is formed, to be determined
Position, first connecting portion 1133 are separately positioned on two the first adjacent stator cores 113 and second with second connecting portion 1134 and determine
On sub- iron core, two grooves are also set, respectively on 113 both sides of the first stator core, the first stator core 113 and the second stator iron
The heart is snuggly mated to together by connecting block 15 under the action of mortise-tenon joint, and such connecting method causes the electricity of stator core
Work Steel material utilization rate to more than 45%, saves electrical sheet material by 15% lifting of traditional scheme, while in cost pressure
On the premise of permission, it can be also lost by selecting the non-directional cold-rolling silicon steel disc of the higher trade mark to reduce electric machine iron core, improve electricity
The operational efficiency of machine, the connecting block 15 of the present embodiment is rivet, and rivet bar can select DT4 or 10# steel.
First stator unit 11 is identical with 14 structure of the second stator unit, is mutually twisted between multiple stator units, and
Under first pressing plate 121 and the support of the second pressing plate 122 are fixed, a regular annulus is circumferentially formed, finally uses Vaccum Permeating again
Lacquer craftwork carries out insulation processing to stator 10, is exactly a complete torque motor stator 10.
Due to coil 112 being directly wound in stator core module, it can be achieved that machine coiling, on the one hand improves processing
Efficiency, another aspect machine coiling 112 compare hand wound, and the uniformity of its machined parameters can obtain preferable guarantee, by coil
112 are directly wound in stator core, shorten the end size of coil 112, on the premise of motor mounting space is constant, stator
The axial length of iron core is increased, and the effective volume of motor is increased, and the output torque of motor is improved.
The present embodiment is designed as diclinic pole structure to obtain good torque ripple and positioning accuracy, by rotor 20, and first
Permanent magnet 221 and the same magnetic pole of three permanent magnet 223 may be contained within same direction, the second permanent magnet 222 and the 4th permanent magnet
224 same magnetic pole may be contained within same direction, the setting of the same magnetic pole of the second permanent magnet 222 and 221 magnetic field of the first permanent magnet
Direction is opposite；First permanent magnet 221 is identical with 222 angle of inclination of the second permanent magnet, 223 and the 4th permanent magnet of three permanent magnet
224 angles of inclination are identical, but the first permanent magnet 221 and 223 angle of inclination of three permanent magnet are on the contrary, the first permanent magnet 221, second
The remainder all same of permanent magnet 222,223 and the 4th permanent magnet 224 of three permanent magnet.
First permanent magnet 221 and the second permanent magnet 222 are arranged in the same side of rotor yoke 21 by circumference, the 3rd permanent magnetism
223 and the 4th permanent magnet 224 of body is arranged in the other side of rotor yoke 21 by circumference, ultimately forms the diclinic pole of 2p poles forever
Magnetic-synchro torque motor rotor 20, it is formed the motor pole groove of multiple-grooved/2p poles after being combined with multiple assembled piece type stator cores
Fit structure.This case has greatly slackened the cogging torque of magneto, has made the air-gap field of motor by the design of tiltangleθ
Sineization, and then the back-emf of motor is tended to be sinusoidal, the purpose for suppressing motor Cymbidium aloifolium is finally reached, makes the output of motor
Torque is more steady；Again, the symmetry of double 20 structures of skewed pole rotor also eliminates rotor 20 and produces axis relative to stator 10
To the possibility of power.
Cogging torque, be due to rotor 20 slot after, caused by the corresponding air-gap permeance of teeth groove is uneven, cogging torque
Mechanism of production is：When motor rotates, magneto will produce cogging torque, and whether its generation and magneto are powered nothing
Close, its intensity changes with the intensity in magnetic field, and air-gap field is stronger, and cogging torque is also bigger, otherwise magnetic field is smaller, cogging torque
It is smaller.
The mechanism produced from cogging torque, in order to make cogging torque be 0, should make total magnetic conductance constant, then turn after skewed slot
The distance of sub 20 oblique poles is：
In formula：
LCM (Q, 2p) --- the least common multiple of number of slots and number of poles；
K --- coefficient；
If t is oblique pole span from the ratio with tooth square, then when t meets [9], cogging torque 0.
If θ is the angle of oblique pole, then when θ meets that [10] are cogging torques 0.
For the correctness of verification above-mentioned theory analysis, the emulation meter of finite element has been carried out with reference to the motor initial parameter of this case
Calculate, as a result as shown in figure 13, solid line is the cogging torque waveform before skewed slot in figure, and dotted line is the cogging torque waveform after skewed slot,
Can be, it is evident that cogging torque be almost weakened as 0 after skewed slot from figure, it is seen that the correctness of theory analysis.
Speed governing permanent magnet synchronous motor all uses inverter supply, and modern frequency converter almost all uses SPWM (sine waves
Pulsewidth modulation) output voltage wave, it be using standard sine wave with triangular wave is modulated forms, SPWM output voltage waveforms
In the sum of low-order harmonic be zero, i.e., the output voltage of SPWM is the sine wave of a standard, and permanent magnet excitation magnetic field and fixed
The spatial distribution of sub 10 winding magnetic fields can not possibly be completely sinusoidal, so counter potential waveform will certainly will be distorted, it is this because anti-
Harmonic torque caused by potential or current waveform distortion is known as Cymbidium aloifolium.
If can ensure motor in speed-change process, its back-emf keeps good approach degree with SPWM all the time, and (its is humorous
The sum of ripple content is controlled within 5% with respect to the aberration rate of fundamental wave), you can ensure the sine ratio of armature supply, which solves
The torque pulsation problem of permanent magnet synchronous motor.
It was found from the law of electromagnetic induction, to make winding back emf waveform sinusoidal, be how to make generation back-emf in fact
The problem of field waveform is sinusoidal.For permanent magnet synchronous motor, method is mainly the following：
1) winding is connect using symmetrical Y；
2) using eccentric air gap；
3) pole embrace is optimized；
4) skewed slot or oblique pole.
For realizing that symmetrical Y connects that winding is very simple, and being substantially all to realize；And to give birth to using non-uniform gap
Production. art is complicated and manufacture is with high costs, does not use generally unless it is absolutely necessary；Therefore can only be from optimization pole embrace and use
The mode of oblique pole optimizes.
According to motor theory, rectangular wave Distribution of Magnetic Field shown in Figure 11 resolves into the number of each harmonic with Fourier series
Learning expression formula is：
In formula：
Bm--- air gap flux density amplitude；
K --- odd number；
Influence of certain subharmonic to counter potential waveform is eliminated by selecting appropriate pole embrace, is permanent magnet synchronous motor
A big advantage.By adjusting the size and the suitable pole embrace of selection of leakage field, make air-gap field waveform in shown in Figure 11
During quasi- trapezoidal wave distribution, then the mathematic(al) representation that space each harmonic is resolved into Fourier series is changed into：
In formula：
α --- the half at main pole pole span short distance angle, α ≠ 0；
As shown in figure 12, find that [15] are [14] by comparing [14] and [15]Times, that is to say, that fundamental wave
Only weakenTimes,When it is approximately 1, and be reduced to [14] formula to each harmonicTimes, and
A certain specific harmonic wave can be eliminated by making k α=π completely.
It was found from electric machine theory, it can be eliminated by 3 odd harmonics divided exactly by the connection of three-phase symmetric winding, in electricity
The improvement of 5 times and 7 subharmonic is most concerned with the design of machine, therefore, preferably selection is：
It is corresponding with α to have another expression-form for permanent magnet synchronous motor：
In formula：
bi--- main pole polar arc width；
τ --- pole span；
αi--- the effective pole arc coefficients；
Di1--- 10 internal diameter of stator；
P --- motor number of pole-pairs；
From [16]：
Such as this case, it is contemplated that the air-gap field of motor, and the installation of permanent magnet, final choice αi=0.7.
Pass through designed inclination angle θ and pole embrace αi, make air-gap field more sinusoidalization of motor, such as Figure 14 is real in figure
Line is the air gap magnetic density waveform of straight trough, and dotted line is the air gap magnetic density waveform of double skewed slots, the air gap magnetic density waveform from Figure 15 to Figure 14
Found after carrying out fft analysis, solid line is the FFT of straight slot motor air gap flux density in Figure 15, and dotted line is double skewed slots motor gas-gap flux density
FFT, the air gap flux density total harmonic distortion factor THD of straight trough is 52.26%, and the air gap flux density total harmonic distortion factor of double skewed slots
THD is 19.69%, it is seen that double skewed slots design fairly obvious to the regulation effect of harmonic wave；It can find out at the same time, air gap flux density after skewed slot
Amplitude is the 95.1% of straight trough, it is seen that influence of the double skewed slots to motor-field energy storage is very small, can be ignored.
Meanwhile pass through designed inclination angle θ and pole embrace αi, make air-gap field more sinusoidalization of motor, therefore motor
Back-emf will also tend to be sinusoidal.As shown in figure 16, the high solid-line curve of amplitude is line counter potential waveform in figure, and the low void of amplitude is bent
Line is opposite potential waveform, carries out fft analysis such as Figure 17 to line back-emf, solid line is line back-emf FFT in figure, it is seen that line is anti-electric
Gesture total harmonic distortion factor THD is only 1.13%, is much better than the 5% of theory analysis requirement.
In the present embodiment, it is diclinic pole structure by the Design of Permanent Magnet on rotor 20, passes through the angle of inclination of optimization design
θ, the cogging torque of permanent magnet synchronous motor is effectively weakened.Produced relatively simultaneously because the symmetry of diclinic pole reduces rotor 20
In the possibility of the axial force of stator 10, pass through the polar arc width b of optimization design permanent magneti, motor is obtained air-gap field waveform
Sineization, and then the counter potential waveform of motor is tended to be sinusoidal, so as to effectively control the Cymbidium aloifolium of motor；Simultaneously as
The air-gap field of motor is sinusoidal, therefore can improve the gas of motor by suitably reducing the gas length between stator 10, rotor 20
Gap magnetic field intensity, and then the magnetic field energy of motor is improved, improve the torque density of motor.
The permanent magnet synchronous motor that the present embodiment is related to, carries 26 high-precision grating encoders, may ultimately reach repetition and determine
Position 2 ＂ of precision, the precision of 10 ＂ of positioning accuracy, as shown in figure 18, the solid line in figure are the measured data of a motor, it was demonstrated that this is forever
Magnetic-synchro motor meets high-precision design requirement.
The above embodiment is only the preferred embodiment of the utility model, it is impossible to is protected with this to limit the utility model
Scope, the change of any unsubstantiality that those skilled in the art is done on the basis of the utility model and replacing belongs to
In the utility model scope claimed.
Claims (10)
- A kind of 1. permanent magnet synchronous motor, it is characterised in that including：Stator, the stator are provided with the first stator unit, and it is fixed that first stator unit includes insulation framework, coil and first Sub- iron core, the insulation framework include the first fixed frame and the second fixed frame for being connected with first fixed frame, and described first Fixed frame is mounted in first stator core with second fixed frame, and the coil is installed on first fixed frame And second on fixed frame；Rotor, the rotor are provided with magnet assembly, and the magnet assembly includes the first permanent magnet, the second permanent magnetism installed successively Body, three permanent magnet and the 4th permanent magnet, are equipped with gap between the rotor and the stator, and are installed on electricity with the stator In machine.
- 2. permanent magnet synchronous motor according to claim 1, it is characterised in that：The stator includes supporting rack, the support Frame include the first pressing plate and with spaced second pressing plate of first pressing plate, the first stator core both ends respectively with institute State the first pressing plate and the connection of the second pressing plate.
- 3. permanent magnet synchronous motor according to claim 2, it is characterised in that：First is provided with first stator core Back-shaped chamber, first fixed frame are mounted on the described first back-shaped chamber with second fixed frame.
- 4. permanent magnet synchronous motor according to claim 3, it is characterised in that：First Line is provided with first fixed frame Groove, the second wire casing is provided with second fixed frame, and first wire casing forms the second back-shaped chamber, institute with second wire casing State coil and be installed on the described second back-shaped intracavitary.
- 5. permanent magnet synchronous motor according to claim 4, it is characterised in that：It is convex that first fixed frame is additionally provided with first Rise and the first groove, corresponding on second fixed frame to be additionally provided with second raised and the second groove, described first raised inserts As for second groove, second protrusion is inserted in first groove.
- 6. permanent magnet synchronous motor according to claim 5, it is characterised in that：The stator further includes fastener, and described First through hole is provided with one pressing plate, the second through hole is provided with second pressing plate, is also set up in first stator core There is third through-hole, the fastener passes through the second through hole, third through-hole and the first through hole, first stator core is consolidated Due between first pressing plate and second pressing plate.
- 7. permanent magnet synchronous motor according to claim 6, it is characterised in that：The stator further includes the second stator unit, Second stator unit includes the second stator core, is additionally provided with first connecting portion in first stator core, and described The second connecting portion being connected with the first connecting portion is additionally provided with two stator cores.
- 8. permanent magnet synchronous motor according to claim 7, it is characterised in that：The stator further includes connecting block, and described One connecting portion and the second connecting portion are groove, and described connecting block one end is inserted in the first connecting portion, and the other end is inserted It is placed in the second connecting portion.
- 9. permanent magnet synchronous motor according to claim 1, it is characterised in that：First permanent magnet and the 3rd permanent magnetism The same magnetic pole of body may be contained within same direction, and the same magnetic pole of second permanent magnet and the 4th permanent magnet may be contained within Same direction, second permanent magnet are opposite with the setting direction of the same magnetic pole of the first magnetic field of permanent magnet.
- 10. permanent magnet synchronous motor according to claim 9, it is characterised in that：First permanent magnet and described second is forever Magnet angle of inclination is identical, and the three permanent magnet is identical with the 4th permanent magnet angle of inclination, first permanent magnet with The three permanent magnet angle of inclination is opposite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721212477.1U CN207283373U (en) | 2017-09-20 | 2017-09-20 | A kind of permanent magnet synchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721212477.1U CN207283373U (en) | 2017-09-20 | 2017-09-20 | A kind of permanent magnet synchronous motor |
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| Publication Number | Publication Date |
|---|---|
| CN207283373U true CN207283373U (en) | 2018-04-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721212477.1U Active CN207283373U (en) | 2017-09-20 | 2017-09-20 | A kind of permanent magnet synchronous motor |
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| CN (1) | CN207283373U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107612258A (en) * | 2017-09-20 | 2018-01-19 | 广州市昊志机电股份有限公司 | A kind of permagnetic synchronous motor |
| CN109599963A (en) * | 2019-01-17 | 2019-04-09 | 日立电梯电机（广州）有限公司 | Core body, stator and motor |
-
2017
- 2017-09-20 CN CN201721212477.1U patent/CN207283373U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107612258A (en) * | 2017-09-20 | 2018-01-19 | 广州市昊志机电股份有限公司 | A kind of permagnetic synchronous motor |
| CN107612258B (en) * | 2017-09-20 | 2024-04-09 | 广州市昊志机电股份有限公司 | Permanent magnet synchronous motor |
| CN109599963A (en) * | 2019-01-17 | 2019-04-09 | 日立电梯电机（广州）有限公司 | Core body, stator and motor |
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