CN110212665A - A kind of method mixed rotor continuous pole permanent-magnet synchronous machine and reduce its torque pulsation - Google Patents
A kind of method mixed rotor continuous pole permanent-magnet synchronous machine and reduce its torque pulsation Download PDFInfo
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- CN110212665A CN110212665A CN201910382092.7A CN201910382092A CN110212665A CN 110212665 A CN110212665 A CN 110212665A CN 201910382092 A CN201910382092 A CN 201910382092A CN 110212665 A CN110212665 A CN 110212665A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/278—Surface mounted magnets; Inset magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/03—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
The invention discloses a kind of methods mixed rotor continuous pole permanent-magnet synchronous machine and reduce its torque pulsation；A kind of continuous pole permanent-magnet synchronous machine of mixed rotor, comprising: external stator and internal rotor；There are five phases to be distributed armature winding on its external stator；There are table embedded permanent magnet and spoke type permanent magnet on its internal rotor；A method of the continuous pole permanent-magnet synchronous machine torque pulsation of mixed rotor is reduced, is specifically included: firstly, reducing torque pulsation by the number of phases for improving magneto；Then, by optimizing pole embrace, the length of thickness and spoke type permanent magnet, width of table embedded permanent magnet, torque pulsation is reduced again；Then, angle offset is carried out to spoke type permanent magnet, further decreases torque pulsation.The motor overcomes the drawbacks of traditional continuous pole permanent-magnet synchronous machine torque pulsation is big, permanent magnet eddy-current loss is big and permanent magnet easily demagnetizes in overload, maintains the feature that original motor torque density is big and permanent magnet utilization rate is high.
Description
Technical field
The present invention relates to the continuous poles of the design of the continuous pole permanent-magnet synchronous machine of mixed rotor, especially mixed rotor
The reduction method of permanent magnet synchronous motor torque pulsation, belongs to the technical field of motor manufacturing.
Background technique
Nowadays permanent magnet synchronous motor, which has been obtained, is widely applied, the various fields from automobile to aerospace, forever
Magnetic-synchro motor all plays highly important role.This mainly has benefited from several distinguishing features of permanent magnet synchronous motor, including
High torque density, high efficiency and bulking value are small etc..Permanent magnet synchronous motor use high energy product magnetic material instead of
Traditional excitation winding not only eliminates the negative effect of excitation winding bring, and simplifies the mechanical structure of motor, makes electricity
Machine operational reliability improves, and mechanical loss also reduces accordingly.
In general, continuous pole permanent-magnet synchronous machine is the continuous pole permanent-magnet synchronous machine of table embedded, which has high turn
Square density and high permanent magnet utilization rate, but it is existing that also there is high torque (HT) pulsation, permanent magnet to be easy to happen demagnetization in overload simultaneously
As.
Many permanent magnet synchronous motors rare earth permanent magnet high using power density, and permanent magnet is expensive, is permanent-magnet synchronous
The prime cost of motor.And continuous pole permanent-magnet synchronous machine can greatly improve permanent magnet utilization rate, therefore, Recent study connects
Continuous pole permanent-magnet synchronous machine becomes hot spot.Continuous pole permanent magnet can greatly improve permanent magnet in fractional-slot concentratred winding motor
Utilization rate, therefore they can reduce the material cost of motor.But existing continuous pole permanent magnet is almost without applied to integer
In slot Distributed Winding permanent magnet synchronous motor.Continuous pole permanent magnet is once applied in integer slot Distributed Winding motor, can bring height
Torque pulsation.Although continuous pole permanent-magnet synchronous machine possesses a series of advantage, for requiring harsh performance application,
Such as electric power steering, servo motor, wind-driven generator, drive system of electric automobile application still suffer from many difficulties.This
A little applications propose very high requirement to the job stability aspect of motor, i.e. the output torque pulsation of motor wants as small as possible,
Output torque pulsation right and wrong are cut down often with valuable to realize steady accurate thrust transmission, therefore study.In conclusion
Research weakens the output torque pulsation right and wrong of continuous pole integer slot permanent magnet synchronous motor often with valuable.
Currently, the inhibition of pole permanent-magnet synchronous machine torque pulsation continuous for fractional-slot concentratred winding, there is ratio both at home and abroad
Compared with in-depth study, such as optimize pole embrace, using multi-layer winding, using the methods of skewed slot, optimization rotor structure.But for whole
The suppression technology of the number continuous pole permanent-magnet synchronous machine torque pulsation of slot is very limited, and studies less.Secondly, for not equal poles
Arc Y-factor method Y, the prior art are only used in the discontinuous pole permanent-magnet synchronous machine of tradition just in the reduction of cogging torque.And
In current widely used embedded or table embedded motor, the source of torque pulsation is not limited solely to cogging torque, it
It may also originate from permanent-magnet torque and reluctance torque, and cogging torque only occupies the small part of torque pulsation.On this basis,
It is far from being enough for being confined to the analysis of the cogging torque of discontinuous pole permanent-magnet synchronous machine.So how to be effectively reduced
Major harmonic in the torque pulsation of the continuous pole permanent-magnet synchronous machine of integer slot is the direction for needing primary study.It is traditional continuous
Pole permanent-magnet synchronous machine permanent magnet eddy-current loss is big, demagnetization phenomenon easily occurs in overload, therefore reduces permanent magnet whirlpool for permanent magnet
Stream loss and the enhancing anti-demagnetization capability of permanent magnet are very significant and necessary for raising electric efficiency and reliability.To sum up
Described, the continuous pole permanent-magnet synchronous machine of research mixed rotor and the method for reducing its torque pulsation are very significant and necessary
's.
Summary of the invention
In view of the above existing problems in the prior art, the present invention provides a kind of continuous pole permanent magnet synchronous electrics of mixed rotor
Machine, the motor mix table embedded permanent magnet and spoke type permanent magnet, and it is same to form a kind of continuous pole permanent magnetism of novel mixed rotor
Motor is walked, the continuous pole permanent-magnet synchronous machine of the mixed rotor has low cost, high torque density, high reliability and high efficiency etc.
Feature.For above-mentioned high torque (HT) pulsation problem of the existing technology, the present invention provides a kind of reduction mixed rotor is continuous
The method of pole permanent-magnet synchronous machine torque pulsation, by optimizing the continuous pole permanent-magnet synchronous machine table embedded permanent magnet of mixed rotor
Pole embrace, the thickness of table embedded permanent magnet, spoke type permanent magnet length and width, to reach torque pulsation reduction
Effect.On the basis of mixed rotor after Multi-variables optimum design continuous pole permanent-magnet synchronous machine, angle is carried out to spoke type permanent magnet
Degree offset, further decreases the torque pulsation of motor.
The object of the present invention is to propose a kind of low cost, low pulse, high torque density, high reliability and efficient mixed
The method box-like rotor continuous pole permanent-magnet synchronous machine and reduce its torque pulsation.
The technical solution adopted by the present invention is that: a kind of continuous pole permanent-magnet synchronous machine rotor structure of mixed rotor, including
Table embedded permanent magnet, spoke type permanent magnet, rotor core；Wherein the table embedded permanent magnet is 2n block, n=1,2,3 ..., shape
Design structure is arcuate structure, and permanent magnet radial magnetizing direction is consistent, and symmetrical table is in rotor core inside circumference, each piece
Table embedded permanent magnet permanent magnet and adjacent rotor core constitute a pair of of pole；The spoke type permanent magnet is 4n block, shape design
It for rectangle structure, is symmetrically built on rotor core two-by-two, every a pair of of pole of two pieces of adjacent wheels spoke permanent magnet composition, each piece
Table embedded permanent magnet and the two neighboring spatially interleaved distribution of spoke type permanent magnet, between two neighboring spoke type permanent magnet
It is 45 °/n before angle offset, every two spoke type permanent magnet is to the disalignment θ/n angle of the two after offset；It should
Motor rotor construction is symmetrical about horizontal line and vertical line.
Further, the table embedded permanent magnet is 2 pieces, and spoke type permanent magnet is 4 pieces.
Further, deviation angle θ is 1 °.
A kind of method of the continuous pole permanent-magnet synchronous machine torque pulsation of reduction mixed rotor of the invention, including following step
It is rapid:
Step 1, by improving the number of phases of permanent magnet synchronous motor, to improve the torque pulsation periodicity of motor, electricity is reduced
Machine torque pulsation；
Step 2, by optimizing the pole embrace of mixed rotor table embedded permanent magnet, the thickness of table embedded permanent magnet, wheel
The length and width of spoke permanent magnet reduces torque arteries and veins to reduce the component for causing torque pulsation in rotor mmf again
It is dynamic；
Step 3, on the basis of the model of obtained optimization motor, angle offset θ is carried out to spoke type permanent magnet, to reach
To the purpose for further decreasing torque pulsation.
Further, the permanent magnet synchronous motor in the step 1 is five phases, torque pulsation TpulCalculation formula are as follows:
Wherein, μ0It is the magnetic conductivity of air, p is number of pole-pairs, and g is gas length, rgIt is the radius of intermediate air gap, L is lamination
Stack length, γdIt is expressed as electric current angle, h is harmonic order, FshAnd FrhRespectively h rank stator and rotor mmf.So can
Generate the stator-rotator magnetic kinetic potential harmonic order of torque pulsation are as follows: h=10m ± 1, m=1,2,3 ... then influence turning for torque pulsation
The harmonic order of sub- air gap flux density are as follows: h=10m ± 1, m=1,2,3 ...；It is compared with traditional three-phase motor, is by design of electrical motor
Five-phase induction motor, it is secondary to 10m (m=1,2,3 ...) from 6m promotion that the torque master pulse of motor moves order.
Further, the pole embrace of the optimization table embedded permanent magnet in the step 2 is the thickness of 0.65, table embedded permanent magnet
Spend 4.1mm, spoke type permanent magnet length be 18.4mm, the width of spoke type permanent magnet is 4.8mm, to reduce influence torque
The harmonic order (10m ± 1, m=1,2,3 ...) of the rotor airgap flux density of pulsation, i.e., cause torque pulsation in rotor mmf
Harmonic order (10m ± 1, m=1,2,3 ...), therefore, the continuous pole permanent-magnet synchronous machine of the mixed rotor proposed are multivariable
Optimization motor torque provides the foundation.
Further, the deviation angle θ in the step 3 is 1 °.
Further, the pole embrace of table embedded permanent magnet is 0.5-0.7, the thickness and table embedded permanent magnetism of table embedded permanent magnet
The ratio of the difference of rotor core internal-and external diameter corresponding to body is 0.1-0.16:1, the length and table embedded permanent magnet of spoke type permanent magnet
The ratio of the difference of corresponding rotor core internal-and external diameter is 0.5-0.8:1, the length of spoke type permanent magnet and spoke type permanent magnet institute
The ratio of the difference of corresponding rotor core internal-and external diameter is 0.5:1；Four Inner arcs of the rotor core are 90 ° relative to the center of circle.
The beneficial effect that the present invention uses is:
1. the pole embrace of table embedded permanent magnet is 0.5-0.7, the thickness of table embedded permanent magnet and table embedded permanent magnet institute
The ratio of the difference of corresponding rotor core internal-and external diameter is 0.1-0.16:1, and the length of spoke type permanent magnet and table embedded permanent magnet institute are right
The ratio of the difference for the rotor core internal-and external diameter answered is 0.5-0.8:1, corresponding to the length of spoke type permanent magnet and spoke type permanent magnet
Rotor core internal-and external diameter difference ratio be 0.5:1；Four Inner arcs of the rotor core are 90 ° relative to the center of circle, are guaranteed
The magneto can combine high permanent magnet utilization rate and high torque density the two advantages.
2. the continuous pole permanent-magnet synchronous machine of mixed rotor in the present invention, for the torque for reducing continuous pole permanent-magnet synchronous machine
Pulsation provide possibility, be not limited to reduction the torque pulsation of cogging torque bring, additionally it is possible to effectively reduce permanent-magnet torque or
Reluctance torque brings torque pulsation, optimizes back-emf and reduces final output torque pulsation, makes motor in terms of stability
It is obviously improved.
3. the continuous pole permanent-magnet synchronous machine of mixed rotor of the invention can reduce permanent magnet eddy-current loss and enhancing electricity
Anti- degaussing ability of the machine permanent magnet in overload.
4. the continuous pole permanent-magnet synchronous machine of mixed rotor of the invention, while it is close to have both low cost, low pulse, high torque (HT)
Degree, high reliability and high efficiency, can be than more comprehensively improving the performance of motor.
5. the method for the continuous pole motor torque ripple of reduction of the invention can be applied to the different number of phases or different slots
The motor of pole cooperation, so that different motors can achieve similar effect.
The continuous pole permanent-magnet synchronous machine of a kind of mixed rotor of the invention is by continuous pole table embedded permanent magnet and spoke
Formula permanent magnet is organically combined, and a kind of continuous pole permanent-magnet synchronous machine of novel mixed rotor is createed.Firstly, by motor
It is designed as five-phase induction motor to compare with traditional three-phase motor, the torque master pulse of motor moves order and mentions from 6m (m=1,2,3 ...) is secondary
It is secondary to be raised to 10m (m=1,2,3 ...), therefore when designing motor, fundamentally reduces motor torque ripple.Secondly, passing through optimization
The length and width of the pole embrace of table embedded permanent magnet, the thickness of table embedded permanent magnet, spoke type permanent magnet, to reduce shadow
The harmonic order (10m ± 1, m=1,2,3 ...) for ringing the rotor airgap flux density of torque pulsation, i.e., cause torque in rotor mmf
The harmonic order (10m ± 1, m=1,2,3 ...) of pulsation, to achieve the effect that reduce torque pulsation again.In Multi-variables optimum design
On the basis of the continuous pole permanent-magnet synchronous machine of mixed rotor afterwards, angle offset is carried out to spoke type permanent magnet, is further decreased
The torque pulsation of motor.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the continuous pole permanent-magnet synchronous machine (original motor) of tradition in the present invention.
Fig. 2 is the structural schematic diagram of the continuous pole permanent-magnet synchronous machine of mixed rotor (embodiment motor) in the present invention.
Fig. 3 is that the rotor airgap flux density of original motor and embodiment motor compares figure in the present invention.
Fig. 4 is the rotor airgap flux density frequency analysis figure of original motor and embodiment motor in the present invention.
Fig. 5 is that the back-emf of original motor and embodiment motor compares figure in the present invention.
Fig. 6 is the back-emf frequency analysis figure of original motor and embodiment motor in the present invention.
Fig. 7 is that the cogging torque of original motor and embodiment motor compares figure in the present invention.
Fig. 8 is that the output torque of original motor and embodiment motor compares figure in the present invention.
Fig. 9 is the output torque frequency analysis figure of original motor and embodiment motor in the present invention.
Figure 10 is that figure is compared in the loss of the output torque of original motor and embodiment motor in the present invention.
Figure 11 is that the efficiency of original motor and embodiment motor compares figure in the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description.
The embodiments described below with reference to the accompanying drawings are exemplary, for explaining only the invention, and should not be understood as
Limitation of the present invention.
Fig. 1 is the structural schematic diagram of the continuous pole permanent-magnet synchronous machine (original motor) of tradition in the present invention.As shown in Figure 1, passing
Continuous pole permanent-magnet synchronous machine of uniting includes external stator 1 and internal rotor 2；The external stator 1 includes 40 stator slots and is embedded in wherein
Armature winding 3；The internal rotor 2 includes rotor core, 4 arcuate permanent magnetic magnetic poles 4.
Fig. 2 is the structural schematic diagram of the continuous pole permanent-magnet synchronous machine of mixed rotor (embodiment motor) in the present invention.Such as
Shown in Fig. 2, it includes external stator 1 and internal rotor 2 that the five of proposition, which mix the continuous pole permanent-magnet synchronous machine of formula rotor,；The external stator
1 including 40 stator slots and embedded in armature winding 3 therein；The internal rotor 2 includes rotor core, 2 arcuate permanent magnetic magnetic poles 4
With 4 spoke type permanent magnetism magnetic poles 5, and θ angle offset is had occurred in spoke type permanent magnet.
It is shown under structures and methods step below by taking five mix the continuous pole permanent-magnet synchronous machine of formula rotor as an example.
Step 1, the continuous pole permanent-magnet synchronous machine rotor structure of a kind of mixed rotor, it is characterised in that: described novel mixed
The box-like continuous pole permanent-magnet synchronous machine rotor structure of rotor includes table embedded permanent magnet, spoke type permanent magnet, rotor core；Wherein
The table embedded permanent magnet is 2 pieces, and shape design structure is arcuate structure, and permanent magnet radial magnetizing direction is consistent, and symmetrical table is embedding
In rotor core inside circumference, each piece of table embedded permanent magnet permanent magnet and adjacent rotor core constitute a pair of of pole；It is described
Spoke type permanent magnet is 4 pieces, and shape is designed as rectangle structure, is symmetrically built on rotor core two-by-two, and every two pieces adjacent, often
Two pieces of adjacent wheels spoke permanent magnets constitute a pair of of pole, and each piece of table embedded permanent magnet and two neighboring spoke type permanent magnet are in space
On be interspersed, be 45 °, after spoke type permanent magnetism solid offsetting before the offset of angle between two neighboring spoke type permanent magnet,
Every two spoke type permanent magnet is to the disalignment θ/n angle of the two；The pole embrace of table embedded permanent magnet is 0.5-
0.7, the ratio of the difference of rotor core internal-and external diameter corresponding to the thickness and table embedded permanent magnet of table embedded permanent magnet is 0.1-0.16:
1, the ratio of the difference of rotor core internal-and external diameter corresponding to the length and table embedded permanent magnet of spoke type permanent magnet is 0.5-0.8:1,
The ratio of the difference of rotor core internal-and external diameter corresponding to the length and spoke type permanent magnet of spoke type permanent magnet is 0.5:1；The rotor
Four Inner arcs of iron core are 90 ° relative to the center of circle；Permanent magnet magnetizing direction is as shown by the white arrows in Fig. 2；Turn in the motor
Son is symmetrical about horizontal line and vertical line.
Step 2, by improving the number of phases of motor, to improve the torque pulsation periodicity of motor, motor torque arteries and veins is reduced
It is dynamic；Five-phase PMSM torque pulsation TpulCalculation formula are as follows:
Wherein, μ0It is the magnetic conductivity of air, p is number of pole-pairs, and g is gas length, rgIt is the radius of intermediate air gap, L is lamination
Stack length, γdIt is expressed as electric current angle, h is harmonic order, FshAnd FrhRespectively h rank stator and rotor mmf.So can
Generate the stator-rotator magnetic kinetic potential harmonic order of torque pulsation are as follows: h=10m ± 1, m=1,2,3 ... then influence turning for torque pulsation
The harmonic order of sub- air gap flux density are as follows: h=10m ± 1, m=1,2,3 ...；It is compared with traditional three-phase motor, is by design of electrical motor
Five-phase induction motor, the dynamic order of the torque master pulse of motor is secondary to 10m (m=1,2,3 ...) from the secondary promotion of 6m (m=1,2,3 ...), therefore,
When designing motor, motor torque ripple is fundamentally reduced.
Step 3, the continuous pole permanent-magnet synchronous machine of the mixed rotor proposed is that Multi-variables optimum design motor provides the foundation,
The pole embrace of table embedded permanent magnet after optimization is the length of 0.65, the thickness 4.1mm of table embedded permanent magnet, spoke type permanent magnet
Degree is 18.4mm, the width of spoke type permanent magnet is 4.8mm, to reduce the harmonic wave for influencing the rotor airgap flux density of torque pulsation
Order (10m ± 1, m=1,2,3 ...), i.e., cause in rotor mmf torque pulsation harmonic order (10m ± 1, m=1,2,
3 ...), to reduce torque pulsation；Therefore, the continuous pole permanent-magnet synchronous machine of the mixed rotor proposed is Multi-variables optimum design electricity
Machine torque provides the foundation.
Step 4, on the basis of the model of obtained optimization motor, θ angle offset is carried out to spoke type permanent magnet, to reach
To the purpose for further decreasing torque pulsation；The deviation angle θ is 1 °.
Fig. 1 is the structural schematic diagram of the continuous pole permanent-magnet synchronous machine of tradition, and the present invention is using it as original motor.
Fig. 2 is the structural schematic diagram of the continuous pole permanent-magnet synchronous machine of mixed rotor, and the present invention is using it as embodiment motor.
The present invention carries out mixed rotor on the basis of original motor, and (PM1 and PM4 are table embedded permanent magnet, and PM2, PM3, PM5 and PM6 are
Spoke type permanent magnet), embodiment motor is obtained, the performance of the two is compared, illustrates beneficial effects of the present invention.
Fig. 3 and Fig. 4 respectively indicates the comparison in terms of original motor and embodiment rotor air gap flux density and its frequency analysis.
As shown in figure 3,9,11,19 and 21 times rotor airgap flux density harmonic wave is greatly decreased after using hybrid continuous pole rotor, this
Indicate that 9 and 11 rotor mmf harmonic waves will be greatly decreased.
Fig. 5 and Fig. 6 respectively indicates the comparison of original motor and embodiment motor in terms of back-emf and its frequency analysis.Such as figure
Shown in 6, after motor uses mixed rotor, not only the harmonic content of unloaded back-emf reduces, but also the amplitude of fundamental wave is slightly
Rise, this indicates motor while the performance in terms of torque pulsation is greatly improved, and average torque only slightly rises.It can
To find out, after using hybrid continuous pole rotor, 9,11,19 and 21 times back-emf harmonic wave is greatly decreased, this indicates torque
1 and 2 major harmonic (10 of pulsationthWith 20thHarmonic wave) can substantially it be weakened.
Fig. 7 is that the cogging torque of original motor and embodiment motor compares figure in the present invention.As shown in Figure 7 as can be seen that by
It declines to a great extent in the cogging torque of the use of mixed rotor, embodiment motor, 2.09Nm is had decreased to by 10.82Nm.
Fig. 8 and Fig. 9 reflects the ratio of original motor and embodiment motor in terms of final output torque and its frequency analysis
Compared with.Compared with original motor, 1 major harmonic of the torque pulsation of embodiment motor is significantly reduced.The torque arteries and veins of embodiment motor
Dynamic to be greatly reduced, torque pulsation has decreased to 6.7% from original 67.5%.And output torque average value is risen by 19.04Nm
19.10Nm is arrived.Simultaneously from Fig. 9 it can also be seen that 1 and 2 major harmonic (10 of torque pulsationthWith 20thHarmonic wave) by substantially
Weaken.
Figure 10 is that figure is compared in the loss of original motor and embodiment motor in the present invention.As shown in Figure 10 as can be seen that due to
The iron loss of the use of mixed rotor, embodiment motor slightly declines, and has decreased to 29.09W, permanent magnet vortex damage by 29.73W
Consumption has decreased to 1.36W by 2.17W.
Figure 11 is that the efficiency of original motor and embodiment motor compares figure in the present invention.As shown in Figure 11 as can be seen that due to
The efficiency of the use of mixed rotor, embodiment motor slightly rises, and has risen to 94.44% by 94.38%.
To sum up, the invention discloses a kind of continuous pole permanent-magnet synchronous machine of mixed rotor and the side of its torque pulsation is reduced
Method.A kind of continuous pole permanent-magnet synchronous machine of mixed rotor, comprising: external stator and internal rotor.The external stator includes stator slot
Be embedded in five phases armature winding therein；The internal rotor includes rotor core, arcuate permanent magnetic magnetic pole and spoke type permanent magnetism magnetic pole.
A method of the torque pulsation of mixed rotor permanent magnet synchronous motor is reduced, is specifically included: by traditional continuous pole permanent-magnet synchronous
Motor and spoke type permanent magnet synchronous motor combine, and form a kind of continuous pole permanent-magnet synchronous machine of novel mixed rotor.Firstly, will
Design of electrical motor is that five-phase induction motor is compared with traditional three-phase motor, and the torque master pulse of motor moves order from 6m (m=1,2,3 ...)
Secondary promotion is secondary to 10m (m=1,2,3 ...), therefore when designing motor, fundamentally reduces motor torque ripple.Secondly, traditional
The continuous embedding permanent magnet of polar arc shape table for optimization the continuous pole permanent-magnet synchronous machine of mixed rotor provide possibility, can be by excellent
Change the length and width of the pole embrace of table embedded permanent magnet, the thickness of table embedded permanent magnet, spoke type permanent magnet, reduces rotor
The harmonic order (10m ± 1, m=1,2,3 ...) for causing torque pulsation in magnetomotive force, to reach what torque pulsation reduced again
Effect.Then, on the basis of the model of obtained optimization motor, further angle offset is carried out to spoke type permanent magnet, into
One step reduces torque pulsation.A kind of novel mixed rotor is formed after table embedded permanent magnet and the mixing of embedded spoke type permanent magnet
Continuous pole permanent-magnet synchronous machine, the motor effectively overcome that traditional continuous pole motor torque ripple is big, permanent magnet eddy-current loss
Greatly, the drawbacks of permanent magnet is easy demagnetization in overload, and the anti-demagnetization capability of motor permanent magnet is enhanced, maintain original motor
Greatly and the high feature of permanent magnet utilization rate, i.e., the motor is with low cost, low pulse, high torque density, highly reliable for torque density
The features such as property and high efficiency.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " illustrative examples ",
The description of " example ", " specific example " or " some examples " etc. means specific features described in conjunction with this embodiment or example, knot
Structure, material or feature are included at least one embodiment or example of the invention.In the present specification, to above-mentioned term
Schematic representation may not refer to the same embodiment or example.Moreover, specific features, structure, material or the spy of description
Point can be combined in any suitable manner in any one or more of the embodiments or examples.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: not
A variety of change, modification, replacement and modification can be carried out to these embodiments in the case where being detached from the principle of the present invention and objective, this
The range of invention is defined by the claims and their equivalents.
Claims (8)
1. a kind of continuous pole permanent-magnet synchronous machine rotor structure of mixed rotor, it is characterised in that: including table embedded permanent magnet, wheel
Spoke permanent magnet, rotor core；Wherein the table embedded permanent magnet is 2n block, and n=1,2,3 ..., shape design structure is arc
Structure, permanent magnet radial magnetizing direction is consistent, and symmetrical table is in rotor core inside circumference, and each piece of table embedded permanent magnet is forever
Magnet and adjacent rotor core constitute a pair of of pole；The spoke type permanent magnet is 4n block, and shape is designed as rectangle structure, two
Two are symmetrically built on rotor core, and every two pieces of adjacent wheels spoke permanent magnet constitutes a pair of of pole, each piece of table embedded permanent magnet and
The two neighboring spatially interleaved distribution of spoke type permanent magnet is before the angle offset between two neighboring spoke type permanent magnet
45 °/n, every two spoke type permanent magnet is to the disalignment θ/n angle of the two after offset；The motor rotor construction closes
It is symmetrical in horizontal line and vertical line.
2. the continuous pole permanent-magnet synchronous machine rotor structure of a kind of mixed rotor according to claim 1, it is characterised in that:
The table embedded permanent magnet is 2 pieces, and spoke type permanent magnet is 4 pieces.
3. the continuous pole permanent-magnet synchronous machine rotor structure of a kind of mixed rotor according to claim 2, it is characterised in that:
Deviation angle θ is 1 °.
4. a kind of method for reducing the continuous pole permanent-magnet synchronous machine torque pulsation of mixed rotor, which is characterized in that including following
Step:
Step 1, it by improving the number of phases of permanent magnet synchronous motor, to improve the torque pulsation periodicity of motor, reduces motor and turns
Square pulsation；
Step 2, by optimizing the pole embrace of mixed rotor table embedded permanent magnet, thickness, the spoke type of table embedded permanent magnet
The length and width of permanent magnet reduces torque pulsation to reduce the component for causing torque pulsation in rotor mmf again；
Step 3, obtain optimization motor model on the basis of, to spoke type permanent magnet carry out angle offset θ, thus reach into
The purpose of one step reduction torque pulsation.
5. a kind of method for reducing the continuous pole permanent-magnet synchronous machine torque pulsation of mixed rotor according to claim 4,
It is characterized by: the permanent magnet synchronous motor in the step 1 is five phases, torque pulsation TpulCalculation formula are as follows:
Wherein, μ0It is the magnetic conductivity of air, p is number of pole-pairs, and g is gas length, rgIt is the radius of intermediate air gap, L is stack of laminations
Length, γdIt is expressed as electric current angle, h is harmonic order, FshAnd FrhRespectively h rank stator and rotor mmf.So can generate
The stator-rotator magnetic kinetic potential harmonic order of torque pulsation are as follows: h=10m ± 1, m=1,2,3 ... then influence the rotor gas of torque pulsation
The harmonic order of gap flux density are as follows: h=10m ± 1, m=1,2,3 ...；It is compared with traditional three-phase motor, is five phases by design of electrical motor
Motor, it is secondary to 10m (m=1,2,3 ...) from 6m promotion that the torque master pulse of motor moves order.
6. a kind of method for reducing the continuous pole permanent-magnet synchronous machine torque pulsation of mixed rotor according to claim 5,
It is characterized by: the pole embrace of the optimization table embedded permanent magnet in the step 2 is the thickness of 0.65, table embedded permanent magnet
4.1mm, spoke type permanent magnet length be 18.4mm, the width of spoke type permanent magnet is 4.8mm, reducing influences torque pulsation
The harmonic order (10m ± 1, m=1,2,3 ...) of rotor airgap flux density, i.e., cause the harmonic wave rank of torque pulsation in rotor mmf
Secondary (10m ± 1, m=1,2,3 ...).
7. a kind of method for reducing the continuous pole permanent-magnet synchronous machine torque pulsation of mixed rotor according to claim 5,
It is characterized by: the deviation angle θ in the step 3 is 1 °.
8. a kind of method for reducing the continuous pole permanent-magnet synchronous machine torque pulsation of mixed rotor according to claim 4,
It is characterized by: the pole embrace of table embedded permanent magnet is 0.5-0.7, the thickness of table embedded permanent magnet and table embedded permanent magnet institute
The ratio of the difference of corresponding rotor core internal-and external diameter is 0.1-0.16:1, and the length of spoke type permanent magnet and table embedded permanent magnet institute are right
The ratio of the difference for the rotor core internal-and external diameter answered is 0.5-0.8:1, corresponding to the length of spoke type permanent magnet and spoke type permanent magnet
Rotor core internal-and external diameter difference ratio be 0.5:1；Four Inner arcs of the rotor core are 90 ° relative to the center of circle.
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