CN108776736A - Weaken the method for low speed permanent magnet synchronous motor cogging torque - Google Patents
Weaken the method for low speed permanent magnet synchronous motor cogging torque Download PDFInfo
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- CN108776736A CN108776736A CN201810580573.4A CN201810580573A CN108776736A CN 108776736 A CN108776736 A CN 108776736A CN 201810580573 A CN201810580573 A CN 201810580573A CN 108776736 A CN108776736 A CN 108776736A
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Abstract
The present invention provides a kind of method weakening low speed permanent magnet synchronous motor cogging torque, including step：S1：A low speed permanent magnet synchronous motor simulation model is established using Maxwell softwares；S2：Optimize the eccentricity of the low speed permanent magnet synchronous motor simulation model, obtains one first optimum results；S3：The slot angle excursion for optimizing the low speed permanent magnet synchronous motor simulation model using oblique pole method simultaneously according to first optimum results, obtains one second optimum results；S4：The pole embrace for optimizing the low speed permanent magnet synchronous motor simulation model simultaneously according to second optimum results, obtains a final optimization pass result；S5：The mechanical structure of a target motor is determined according to the final optimization pass result.A kind of method of weakening low speed permanent magnet synchronous motor cogging torque of the present invention can effectively reduce the fundamental wave and harmonic wave of the torque of motor tooth socket, and can observe the size of cogging torque by the counter potential waveform of each phase, magnetic linkage and unloaded output torque.
Description
Technical field
The present invention relates to designing permanent-magnet synchronous motor fields more particularly to a kind of weakening low speed permanent magnet synchronous motor tooth socket to turn
The method of square.
Background technology
Durface mounted permanent magnet synchronous motor have it is small, simple in structure, the technical characterstics such as technology maturation are widely answered
It uses in many engineering fields, right and wrong are often with the energy saving and environment friendly motor for having development potentiality.Although magneto has numerous excellent
Point, but still there are problems that some influence its output performance and merit our study, wherein important one kind is exactly tooth socket
Torque.Itself this existing tooth socket physical arrangement of magneto can cause to generate a kind of torque in motor, even if armature around
Group no power still will produce similar this torque, i.e. cogging torque in the case of.Cogging torque will be such that motor generation turns
Square fluctuates, and so as to cause vibration and noise, makes motor be difficult to smoothly run, influences the overall performance of motor.In addition, tooth socket turns
Square also can generate obvious influence to the precision and performance of position control system and speed control system.Therefore, it grinds herein
The method for studying carefully weakening cogging torque is of great significance to the performance for promoting motor.There are many sides under present technical situation
Method：Skewed slot, not equal slot openings, the cooperation of pole slot, tiltedly technological means such as extremely.
The auxiliary channel process of motor is used on many motors, add auxiliary tank the purpose is to reduce main harmonic components, together
When auxiliary tank itself will produce harmonic wave, when the harmonic in-phase position that the harmonic wave that auxiliary tank generates is generated with original son changes, can make
Location torque increases；Conversely, location torque can be made to reduce.Auxiliary flute center line and the angle of stator punching center line determine
The two is with phase or reverse phase.The harmonic wave that added auxiliary flute generates, it will offset original harmful harmonic component P times is humorous
Wave, the effect that same punching increases by two auxiliary flutes in symmetric position are harmonic component of cancelling out each other, the choosing of proper angle
It selects, the reduction of the near coal-mine aperture position of punching can reduce energy variation.In same punching, auxiliary flute is in symmetric position
Arrangement can obtain preferable effect.It, can be by adjusting corresponding when the armature parameter of motor is not even number when equal slot openings cooperation
The size of two slot openings reduces cogging torque, but not wide notch weaken cogging torque for armature parameter be odd number instead
So that the cogging torque of motor increases.
Low speed permanent magnet synchronous motor generally refers to the motor that rotating speed is less than 500r/min.Such motor is passed in many industry
Be in dynamic field it is common, as elevator drive system, heavy machine tool, mining machinery, petroleum machinery, chemical machinery, electric machinery,
Metallurgical machinery and building machinery etc., in these low speed permanent magnet synchronous motors, the tooth socket that we generally require to reduce motor turns
Square is to improve entire tumbler stability and operational efficiency.Currently, still lacking one kind, can effectively to weaken low-speed permanent-magnet same
The harmonic wave for walking motor cogging torque, reducing motor, and the method for observable cogging torque.
Invention content
Deficiency in for the above-mentioned prior art, the present invention, which provides, a kind of weakening low speed permanent magnet synchronous motor cogging torque
Method can effectively reduce the fundamental wave and harmonic wave of the torque of motor tooth socket, and can pass through the counter potential waveform of each phase, magnetic linkage and sky
Output torque is carried to observe the size of cogging torque.
To achieve the goals above, the present invention provides a kind of method weakening low speed permanent magnet synchronous motor cogging torque, packet
Include step：
S1：A low speed permanent magnet synchronous motor simulation model is established using Maxwell softwares；
S2：Optimize the eccentricity of the low speed permanent magnet synchronous motor simulation model, obtains one first optimum results；
S3：Optimize the low speed permanent magnet synchronous motor simulation model using oblique pole method simultaneously according to first optimum results
Slot angle excursion, obtain one second optimum results；
S4：Optimize the polar arc system of the low speed permanent magnet synchronous motor simulation model simultaneously according to second optimum results
Number obtains a final optimization pass result；
S5：The mechanical structure of a target motor is determined according to the final optimization pass result.
Preferably, the S2 steps further comprise step：
S21：The shape invariance of the magnet steel of the low speed permanent magnet synchronous motor simulation model is kept, it is same to the low-speed permanent-magnet
It walks simulation model of motor and carries out emulation testing, obtain one first current tooth socket of the low speed permanent magnet synchronous motor simulation model and turn
Square data；
S22：Multigroup different eccentricities of the low speed permanent magnet synchronous motor are set and emulation testing acquisition is corresponding multigroup
Second cogging torque data；
S23：The eccentricity corresponding to the minimum value in the second cogging torque data is chosen as best inclined
The heart away from；
S24：Finite element analysis is carried out to multiple performance indicators of the low speed permanent magnet synchronous motor simulation model, obtains institute
State the first optimum results.
Preferably, in the S24 steps：
Finite element is carried out to the performance indicator of the low speed permanent magnet synchronous motor simulation model using Maxwell softwares
Emulation；The performance indicator includes cogging torque, air gap flux density and Wen Sheng；
By cogging torque numerical value, minimum, air gap magnetic density waveform is most preferably and Wen Sheng is imitated no more than the low speed permanent magnet synchronous motor
The scheme of the predetermined material temperature of true mode is as first optimum results.
Preferably, the S3 steps further comprise step：
S31：Multigroup different slots angle excursion of the low speed permanent magnet synchronous motor is set and emulation testing obtains corresponding group
Third cogging torque data and phase data；
S32：It is drawn according to the third cogging torque data and the phase data and obtains a cogging torque and phase
Comparison diagram；
S32：According to the comparison diagram of the cogging torque size and phase, select in the third cogging torque data most
The relatively small one slot angle excursion of distortion of small value and the phase is as optimal slot angle excursion；
S33：Using the low speed permanent magnet synchronous motor simulation model corresponding to the optimal slot angle excursion at this time as
Second optimum results.
Preferably, the S4 steps further comprise step：
S41：The counter potential waveform of the low speed permanent magnet synchronous motor simulation model is emulated by Maxwell；
S42：The pole embrace for changing the low speed permanent magnet synchronous motor simulation model, further decreases the low-speed permanent-magnet
The cogging torque numerical value of synchronous motor simulation model, and when the counter potential waveform is steady and in sinusoidal waveform, by current institute
Pole embrace is stated as optimal pole embrace, by the presently described low speed permanent magnet synchronous motor corresponding to the optimal pole embrace
Simulation model is as the final optimization pass result.
Preferably, in the S5 steps, according to the optimum results and the practical machinery knot for determining a target motor is combined
Structure.
The present invention makes it have following advantageous effect as a result of above technical scheme：
For the present invention for the shape of magnet steel, pole embrace and magnet steel position have carried out the discussion of different schemes, and determine
The final global design of permanent magnet synchronous motor, cogging torque are declined；The fundamental wave and harmonic wave of motor cogging torque can be reduced,
And the size of cogging torque can be observed by the counter potential waveform of each phase, magnetic linkage and unloaded output torque.
Description of the drawings
Fig. 1 is the flow chart of the method for the weakening low speed permanent magnet synchronous motor cogging torque of the embodiment of the present invention；
Fig. 2 is the original eccentricity distance and cogging torque comparison diagram of the embodiment of the present invention；
Fig. 3 is the initial counter potential waveform oscillogram of the embodiment of the present invention；
Fig. 4 is the cogging torque figure of the slot angle excursion after the optimization of the embodiment of the present invention；
Fig. 5 is the motor stamping cogging torque figure after the optimization magnet steel width of the embodiment of the present invention；
Fig. 6 is the counter potential waveform oscillogram after the optimization of the embodiment of the present invention.
Specific implementation mode
Below according to 1~Fig. 6 of attached drawing, presently preferred embodiments of the present invention is provided, and be described in detail, enabled more preferable geographical
Solve function, the feature of the present invention.
Referring to Fig. 1, the present invention provides a kind of method weakening low speed permanent magnet synchronous motor cogging torque, including step：
S1：A low speed permanent magnet synchronous motor simulation model is established using Maxwell softwares.
S2：Optimize the eccentricity of low speed permanent magnet synchronous motor simulation model, obtains one first optimum results.
Wherein, S2 steps further comprise step：
S21：The shape invariance for keeping the magnet steel of low speed permanent magnet synchronous motor simulation model, it is imitative to low speed permanent magnet synchronous motor
True mode carries out emulation testing, obtains one first current cogging torque data of low speed permanent magnet synchronous motor simulation model；
S22：The multigroup different eccentricities and emulation testing that low speed permanent magnet synchronous motor is arranged obtain corresponding multigroup second
Cogging torque data；
S23：The eccentricity corresponding to the minimum value in the second cogging torque data is chosen as best eccentricity；
S24：Finite element analysis is carried out to multiple performance indicators of low speed permanent magnet synchronous motor simulation model, it is excellent to obtain first
Change result.
In S24 steps：Have to the performance indicator of low speed permanent magnet synchronous motor simulation model using Maxwell softwares
Limit member emulation；Performance indicator includes cogging torque, air gap flux density and Wen Sheng；
By cogging torque numerical value, minimum, air gap magnetic density waveform is most preferably and Wen Sheng is no more than low speed permanent magnet synchronous motor and emulates mould
The scheme of the predetermined material temperature of type is as the first optimum results.
S3：Optimize the slot deflection of low speed permanent magnet synchronous motor simulation model using oblique pole method simultaneously according to the first optimum results
Angle obtains one second optimum results.
The oblique pole method of split pole of magnetic pole can be realized through the certain angle of the angle offset by motor slot, and it is poor to reach motor magnetic conductance
The effect of different reduction.
S3 steps further comprise step：
S31：Multigroup different slots angle excursion of low speed permanent magnet synchronous motor is set and emulation testing obtains the of corresponding group
Three cogging torque data and phase data；
S32：The comparison diagram for obtaining a cogging torque and phase is drawn according to third cogging torque data and phase data；
S32：According to the comparison diagram of cogging torque size and phase, the minimum value in third cogging torque data and phase are selected
The relatively small slot angle excursion of distortion of position is as optimal slot angle excursion；
S33：Using the low speed permanent magnet synchronous motor simulation model corresponding to optimal slot angle excursion at this time as the second optimization
As a result.
S4：The magnet steel width for optimizing low speed permanent magnet synchronous motor simulation model simultaneously according to the second optimum results, obtains one
Final optimization pass result.
Wherein, S4 steps further comprise step：
S41：The counter potential waveform of low speed permanent magnet synchronous motor simulation model is emulated by Maxwell；In the ideal case,
Counter potential waveform is a sine wave, the effects that due to cogging torque under, actual counter potential waveform will produce distortion；
S42：The pole embrace for changing low speed permanent magnet synchronous motor simulation model, further decreases low speed permanent magnet synchronous motor
The cogging torque numerical value of simulation model, and when counter potential waveform is steady and in sinusoidal waveform, using current pole embrace as most
Excellent pole embrace, using the current low speed permanent magnet synchronous motor simulation model corresponding to optimal pole embrace as final optimization pass knot
Fruit.
S5：According to final optimization pass result and combine the practical mechanical structure for determining a target motor.
The change of magnet steel width is realized in the present embodiment using pole embrace method, can be reached by changing the length of magnet steel
Change to motor gas-gap magnetic field size, suitable pole embrace can on the basis of being maintained motor output torque,
Reduce the cogging torque of motor.
Such as：
First, a low speed permanent magnet synchronous motor simulation model is established using Maxwell softwares.
Then, the shape invariance for keeping the magnet steel of low speed permanent magnet synchronous motor simulation model, to low speed permanent magnet synchronous motor
Simulation model carries out emulation testing, obtains one first current cogging torque data of low speed permanent magnet synchronous motor simulation model；Its
Numerical value is 4.72N；The multigroup different eccentricities and emulation testing that low speed permanent magnet synchronous motor is arranged obtain corresponding multigroup second
Cogging torque data, multigroup difference eccentricity is 5,10,15,20；In the present embodiment, when eccentricity is 20, cogging torque
Value is minimum, and size is 2.8Nm；At this point, determining that 20 are used as best eccentricity；On the basis of keeping best eccentricity, profit
Finite element simulation is carried out to the performance indicator of low speed permanent magnet synchronous motor simulation model with Maxwell softwares；Performance indicator includes
Cogging torque, air gap flux density and Wen Sheng；By cogging torque numerical value, minimum, air gap magnetic density waveform is most preferably and Wen Sheng is no more than low speed forever
The scheme of the predetermined material temperature of magnetic-synchro simulation model of motor is as the first optimum results.Original eccentricity distance and cogging torque pair
Fig. 2 is please referred to than figure.
Then, six groups of different slots angle excursions of ascending setting low speed permanent magnet synchronous motor：2.5°,3.75°,5°,
6.25 °, 7.5 ° and 8.75 °.When slot angle excursion is 2.5 °, the cogging torque of motor is 1.89Nm；When slot angle excursion
When being 3.75 °, the cogging torque of motor is 1.64Nm；When slot angle excursion is 5 °, the cogging torque of motor is
1.073N·m；When slot angle excursion is 6.25 °, motor cogging torque is asymmetric, and maximum amplitude reaches 0.832Nm；Work as slot
When angle excursion is 7.5 °, the cogging torque of motor is 0.41Nm, and it is relatively small to distort at this time；When the angle of bevel of motor
When more than 7.5 °, for example slot angle excursion is 8.75 °, and the cogging torque of motor is 0.495Nm；Amplitude is risen, and
Waveform is bad.To sum up, it is seen then that 7.5 ° are optimal slot angle excursion；By the low-speed permanent-magnet corresponding to optimal slot angle excursion at this time
Synchronous motor simulation model is as the second optimum results.Wherein, 0 degree of initial slot angle excursion please refers to Fig. 2 and the slot after optimization
The punching of angle excursion is referring to Fig. 4, it is 0.65 that the slot angle excursion after optimization, which please refers to Fig. 4 with the pole embrace after optimization,
Motor stamping please refers to Fig. 5.
The counter potential waveform of low speed permanent magnet synchronous motor simulation model is emulated by Maxwell again；It is same to change low-speed permanent-magnet
The pole embrace for walking simulation model of motor, further decreases the cogging torque numerical value of low speed permanent magnet synchronous motor simulation model, and
It is optimal in the present embodiment using current pole embrace as optimal pole embrace when counter potential waveform is steady and in sinusoidal waveform
The value of pole embrace is 0.65, and the cogging torque of motor is reduced to 0.384Nm at this time；Corresponding to optimal pole embrace
Current low speed permanent magnet synchronous motor simulation model as final optimization pass as a result, initially counter potential waveform oscillogram refers to Fig. 3, it is excellent
Counter potential waveform oscillogram after change refers to Fig. 6.
Finally, according to final optimization pass result and the practical mechanical structure for determining a target motor of combination
A kind of method of weakening low speed permanent magnet synchronous motor cogging torque of the embodiment of the present invention, for the shape of magnet steel,
Pole embrace and magnet steel position have carried out the discussion of different schemes, and the final global design of permanent magnet synchronous motor, tooth is determined
Slot torque is declined；The fundamental wave and harmonic wave of motor cogging torque can be reduced, and the counter potential waveform of each phase, magnetic linkage can be passed through
The size of cogging torque is observed with unloaded output torque.
The present invention has been described in detail with reference to the accompanying drawings, those skilled in the art can be according to upper
It states and bright many variations example is made to the present invention.Thus, certain details in embodiment should not constitute limitation of the invention, this
Invention will be using the range that the appended claims define as protection scope of the present invention.
Claims (6)
1. a kind of method weakening low speed permanent magnet synchronous motor cogging torque, including step：
S1：A low speed permanent magnet synchronous motor simulation model is established using Maxwell softwares；
S2：Optimize the eccentricity of the low speed permanent magnet synchronous motor simulation model, obtains one first optimum results；
S3：Optimize the slot of the low speed permanent magnet synchronous motor simulation model using oblique pole method simultaneously according to first optimum results
Angle excursion obtains one second optimum results；
S4：The pole embrace for optimizing the low speed permanent magnet synchronous motor simulation model simultaneously according to second optimum results, is obtained
Obtain a final optimization pass result；
S5：The mechanical structure of a target motor is determined according to the final optimization pass result.
2. the method according to claim 1 for weakening low speed permanent magnet synchronous motor cogging torque, which is characterized in that the S2
Step further comprises step：
S21：The shape invariance for keeping the magnet steel of the low speed permanent magnet synchronous motor simulation model synchronizes electricity to the low-speed permanent-magnet
Machine simulation model carries out emulation testing, obtains one first current cogging torque number of the low speed permanent magnet synchronous motor simulation model
According to；
S22：The multigroup different eccentricities and emulation testing that the low speed permanent magnet synchronous motor is arranged obtain corresponding multigroup second
Cogging torque data；
S23：The eccentricity corresponding to the minimum value in the second cogging torque data is chosen as best eccentricity；
S24：Finite element analysis is carried out to multiple performance indicators of the low speed permanent magnet synchronous motor simulation model, obtains described the
One optimum results.
3. the method according to claim 2 for weakening low speed permanent magnet synchronous motor cogging torque, which is characterized in that described
In S24 steps：
It is imitative that finite element is carried out to the performance indicator of the low speed permanent magnet synchronous motor simulation model using Maxwell softwares
Very；The performance indicator includes cogging torque, air gap flux density and Wen Sheng；
By cogging torque numerical value, minimum, air gap magnetic density waveform is most preferably and Wen Sheng is no more than the low speed permanent magnet synchronous motor and emulates mould
The scheme of the predetermined material temperature of type is as first optimum results.
4. the method according to claim 3 for weakening low speed permanent magnet synchronous motor cogging torque, which is characterized in that the S3
Step further comprises step：
S31：Multigroup different slots angle excursion of the low speed permanent magnet synchronous motor is set and emulation testing obtains the of corresponding group
Three cogging torque data and phase data；
S32：The comparison for obtaining a cogging torque and phase is drawn according to the third cogging torque data and the phase data
Figure；
S32：According to the comparison diagram of the cogging torque size and phase, the minimum value in the third cogging torque data is selected
And the relatively small one slot angle excursion of distortion of the phase is as optimal slot angle excursion；
S33：Using the low speed permanent magnet synchronous motor simulation model corresponding to the optimal slot angle excursion at this time as described in
Second optimum results.
5. the method according to claim 4 for weakening low speed permanent magnet synchronous motor cogging torque, which is characterized in that the S4
Step further comprises step：
S41：The counter potential waveform of the low speed permanent magnet synchronous motor simulation model is emulated by Maxwell；
S42：The pole embrace for changing the low speed permanent magnet synchronous motor simulation model further decreases the low-speed permanent-magnet and synchronizes
The cogging torque numerical value of simulation model of motor, and when the counter potential waveform is steady and in sinusoidal waveform, by presently described pole
Arc coefficient emulates the presently described low speed permanent magnet synchronous motor corresponding to the optimal pole embrace as optimal pole embrace
Model is as the final optimization pass result.
6. the method according to claim 5 for weakening low speed permanent magnet synchronous motor cogging torque, which is characterized in that the S5
In step, according to the optimum results and the practical mechanical structure for determining a target motor is combined.
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| CN201810580573.4A CN108776736A (en) | 2018-06-07 | 2018-06-07 | Weaken the method for low speed permanent magnet synchronous motor cogging torque |
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| CN201810580573.4A CN108776736A (en) | 2018-06-07 | 2018-06-07 | Weaken the method for low speed permanent magnet synchronous motor cogging torque |
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| CN110545060A (en) * | 2019-09-25 | 2019-12-06 | 西安西微智能科技有限公司 | motor torque current optimization method and surface-mounted permanent magnet motor |
| CN110661456A (en) * | 2019-09-27 | 2020-01-07 | 西安西微智能科技有限公司 | Optimization method of motor cogging torque and torque fluctuation and surface-mounted permanent magnet motor |
| CN110750841A (en) * | 2019-09-18 | 2020-02-04 | 江苏大学 | Weakening and analyzing method for cogging torque of surface-mounted permanent magnet motor |
| CN113177862A (en) * | 2021-05-10 | 2021-07-27 | 山东大学 | Method and system for generating different pole arc coefficients of magnetic poles weakening inherent axis voltage in combined mode |
| CN115062513A (en) * | 2022-06-20 | 2022-09-16 | 嘉兴学院 | ADNN-based permanent magnet synchronous linear motor positioning force calculation model construction method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110750841A (en) * | 2019-09-18 | 2020-02-04 | 江苏大学 | Weakening and analyzing method for cogging torque of surface-mounted permanent magnet motor |
| CN110750841B (en) * | 2019-09-18 | 2024-06-07 | 江苏大学 | Surface-mounted permanent magnet motor cogging torque weakening and analyzing method |
| CN110545060A (en) * | 2019-09-25 | 2019-12-06 | 西安西微智能科技有限公司 | motor torque current optimization method and surface-mounted permanent magnet motor |
| CN110545060B (en) * | 2019-09-25 | 2021-10-08 | 西安西微智能科技有限公司 | Motor torque current optimization method and surface-mounted permanent magnet motor |
| CN110661456A (en) * | 2019-09-27 | 2020-01-07 | 西安西微智能科技有限公司 | Optimization method of motor cogging torque and torque fluctuation and surface-mounted permanent magnet motor |
| CN110661456B (en) * | 2019-09-27 | 2021-10-22 | 西安西微智能科技有限公司 | Optimization method of motor cogging torque and torque fluctuation and surface-mounted permanent magnet motor |
| CN113177862A (en) * | 2021-05-10 | 2021-07-27 | 山东大学 | Method and system for generating different pole arc coefficients of magnetic poles weakening inherent axis voltage in combined mode |
| CN113177862B (en) * | 2021-05-10 | 2022-12-02 | 山东大学 | Method and system for generating different pole arc coefficients of magnetic poles weakening inherent axis voltage in combined mode |
| CN115062513A (en) * | 2022-06-20 | 2022-09-16 | 嘉兴学院 | ADNN-based permanent magnet synchronous linear motor positioning force calculation model construction method |
| CN115062513B (en) * | 2022-06-20 | 2024-05-17 | 嘉兴学院 | ADNN-based permanent magnet synchronous linear motor positioning force calculation model construction method |
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Application publication date: 20181109 |