CN103853891B - A kind of variable element permasyn morot modeling method based on finite element analysis - Google Patents
A kind of variable element permasyn morot modeling method based on finite element analysis Download PDFInfo
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Abstract
The present invention relates to a kind of variable element permasyn morot modeling method based on finite element analysis, comprise the following steps: set up the three-dimensional finite element electromagnetic-field simulation model of permasyn morot, and it is carried out transient state Coupled field and circuit analysis, to obtain a large amount of characteristic parameter;Create the permasyn morot voltage equation and torque equation improved;According to the permasyn morot mathematical model improved, build the phantom of permasyn morot;Obtained each characteristic parameter is passed through the corresponding port of phantom, completes building of variable element permasyn morot Dynamic Simulation Model based on finite element analysis.The permasyn morot model of the present invention can consider the effects such as magnetic field saturation effect, d q axle cross-coupling effect, eddy current and magnetic hysteresis, improve the accuracy of existing permasyn morot model while taking into account real-time, be particularly well-suited to permagnetic synchronous motor power-off heavily throw, the research of the dynamic process such as three-phase suddenly-applied short circuit.
Description
Technical field
The invention belongs to the modeling method of motor, be specifically related to a kind of variable element permanent-magnet synchronous based on finite element analysis
Motor modeling method.
Background technology
Permasyn morot because its volume is little, performance is good, the feature such as simple in construction, reliability are high, output torque is big,
Receive extensive concern, especially at robot, space flight and aviation, precision electronic device equipment etc. to motor performance, control
Application scenario that required precision processed is higher and field.The large inertia such as high ferro locomotive, electric automobile and large scale propeller are born
The driving motor carried the most progressively develops into permasyn morot from induction conductivity.And permagnetic synchronous motor power-off-weight
The dynamic process times such as throwing, three-phase suddenly-applied short circuit are short, model and Parameters variation big, effective control of dynamic process to be realized
System, needs to set up the dynamic model fast, accurately being convenient for electromagnetic field analysis to provide the basis analyzed.
The most conventional motor modeling method has two kinds: Analysis of Magnetic Circuit model and field analysis model (i.e. FEM calculation mould
Type).Traditional d-q axle Analysis of Magnetic Circuit model based on two-reaction system, has that calculating is easy, simulation velocity is fast
Feature, but it considers that motor inductances and the fundametal compoment of air gap flux linkage do not account for harmonic effects, have ignored magnetic field
The impact of saturation effect, d-q between centers cross-couplings effect, eddy-current loss and magnetic hystersis loss, it is difficult to meet dynamic process
The needs analyzed.And magnetic field analysis model uses the method for finite element analysis to carry out Electromagnetic Calculation completely, although net
The accurate subdivision of lattice is obtained in that high-precision electromagnetic field model, but computationally intensive, the longest, it is impossible to for motor
Real-time control, and between motor internal parameter, electromagnetic relationship embodies clear and definite not, is unfavorable for research and analysis.
Summary of the invention
Solve the technical problem that
In place of the deficiencies in the prior art, it is same that the present invention proposes a kind of variable element permanent magnetism based on finite element analysis
Step motor modeling method, it is possible to consider magnetic field saturation effect, d-q axle cross-coupling effect, eddy current and magnetic hysteresis
Effect with improve existing permasyn morot model accuracy, and can easily embody permasyn morot inductance,
The isoparametric change of resistance, magnetic linkage, rotary inertia.
Technical scheme
A kind of variable element permasyn morot modeling method based on finite element analysis, it is characterised in that step is as follows:
Step 1: according to the structural parameters of designed permasyn morot, set up the three-dimensional of permasyn morot
Finite element electromagnetic-field simulation model;
Step 2: use finite element transient field road coupling analytical method that phantom is carried out transient state Coupled field and circuit analysis,
Obtain direct-axis synchronous inductance value L of permasyn morot under different cross, straight shaft currentdd, quadrature axis synchronous inductance value Lqq、
The quadrature axis mutual inductance value L in d-axisdqWith the d-axis mutual inductance value L in quadrature axisqd, permasyn morot under different temperatures
Phase resistance value R and permanent magnet flux linkage value ψf;
Step 3: then calculate in equivalence one electric cycle of motor the quadrature axis automatic virtual blocks of eddy current and magnetic hystersis loss sum around
Group inductance value LQQ, resistance value RQWith d-axis automatic virtual blocks winding inductance value LDD, resistance value RD:
Wherein:ψD' it is that the three-phase that d-axis orients when lower rotor part maintains static synthesizes magnetic linkage,
ψDThree-phase synthesis magnetic linkage when rotating with rated speed for d-axis orientation lower rotor part, ψQ' fix for quadrature axis orientation lower rotor part
Three-phase synthesis magnetic linkage when not turning, ψQThree-phase synthesis magnetic linkage when rotating with rated speed for quadrature axis orientation lower rotor part,
ΔθDFor ψD' and ψDPhase contrast, Δ θQFor ψQ' and ψQPhase contrast, f is power frequency, LdDFor synchronous motor
The amplitude of mutual inductance, L between stator phase winding and d-axis automatic virtual blocks windingqQVirtual with quadrature axis for synchronous motor stator phase winding
The amplitude of mutual inductance between Damper Winding;
Step 4: calculate d-axis permanent magnet flux linkage ψdpmWith quadrature axis permanent magnet flux linkage ψqpm:
ψdpm=(0.8~1.2) * ψf,
ψqpm=(0.8~1.2) * ψf,
Wherein: ψfFor permasyn morot saturation coefficient;
Determine that permasyn morot mechanical friction is lost PmsWith stray loss P during motor output rated powersN:
Wherein: η is motor operational efficiency, P is motor rated power;
Step 5: the motor characteristic parameter obtained with step 2~step 4, build permasyn morot voltage equation and
Torque equation:
Permasyn morot voltage equation is:
Permasyn morot torque equation is:
Step 6: utilize motor to control class simulation software MATLAB/Simulink to the synchronous permanent-magnet motor in step 5
Machine voltage equation and torque equation are built, and obtain variable element permasyn morot based on finite element analysis dynamic
The model of simulation modeling.
Described LdDFor direct-axis synchronous inductance LddThe 1% of meansigma methods.
Described LqQFor quadrature axis synchronous inductance LqqThe 1% of meansigma methods.
Beneficial effect
A kind of based on finite element analysis the variable element permasyn morot modeling method that the present invention proposes, according to motor
The result of Electromagnetic Simulation carries out permasyn morot Ontology Modeling, it is contemplated that magnetic field saturation effect, d-q axle intersection coupling
Close effect, eddy current with hysteresis effect to motor body parameter and the impact of electromagnetic torque, by the motor electricity that input is variable
The constant parameter of the equivalence loss that the parameters such as sense, resistance, magnetic linkage are less with relative change, both can simulate reality accurately
Motor runnability, can input again the parameters such as the motor inductances of any amplitude, resistance, permanent magnet flux linkage, studies motor pole
The change of the parameter of electric machine impact on control performance under limit running status, and can reach the real-time control of motor.
Compared with prior art, the having the beneficial effects that of the method:
1, by input FEM calculation gained accurate parameter of electric machine value, can consider magnetic field saturation,
D-q axle cross-coupling effect, slot effect, permanent magnet and the eddy current effect of rotor core, the impact of higher hamonic wave,
Transient reactance and the change of subtransient reactance, closer to real electrical machinery running status, improve permasyn morot and move
The accuracy that state is analyzed;
2, the mechanical loss of motor, stray loss, iron loss and the copper loss impact on electromagnetic torque are considered;
3, traditional constant value inductance being encapsulated in motor model, resistance, permanent magnet flux linkage, rotary inertia parameter are become
The parameter that can be inputted by outside port, amplitude can arbitrarily change;
4, by the parameter of electric machine a range of under input limits duty, real electrical machinery can be simulated with extraneous work
Make the impact on motor control performance after environmental change;
5, for parameter identification necessary in popular position Sensorless Control, change based on finite element analysis is joined
Number permasyn morot Dynamic Simulation Model can determine parameter identification by arbitrarily changing the size of parameter of electric machine amplitude
Algorithm hold back scattered property, accuracy and rapidity;
6, for needing to use the motor control mode (such as Direct Torque Control, ANN Control) of motor body parameter,
Desired parameters can be connected to control by based on finite element analysis variable element permasyn morot Dynamic Simulation Model easily
In molding block;
7, the input voltage port of variable element permasyn morot Dynamic Simulation Model based on finite element analysis is electric power
Line type, can directly inverter with power line types port be connected, it is not necessary to again build inverter bridge with discrete component.
Accompanying drawing explanation
Fig. 1 is variable element permasyn morot Dynamic Simulation Model modeling procedure figure based on finite element analysis;
Fig. 2 is variable element permasyn morot three-dimensional finite element transient field analysis chart based on finite element analysis;
Fig. 3 is the curve chart that cross, straight axle synchronous inductance changes with cross, straight shaft current with cross-couplings inductance;
Fig. 4 is variable element permasyn morot phantom based on finite element analysis and parameter arranges figure;
Fig. 5 is variable element permasyn morot voltage equation module map based on finite element analysis;
Fig. 6 is variable element permasyn morot torque equation module map based on finite element analysis;
Fig. 7 is variable element permasyn morot dynamic process simulation result based on finite element analysis.
Detailed description of the invention
In conjunction with embodiment, accompanying drawing, the invention will be further described:
Fig. 1 is variable element permasyn morot modeling procedure figure based on finite element analysis.Below in conjunction with the accompanying drawings, with
As a example by a set of 30KW non-salient pole permanent magnet synchronous motor, list variable element permanent-magnet synchronous based on finite element analysis in detail
Motor modeling method and process:
1., according to the structural parameters of designed permasyn morot, initially set up the permanent-magnet synchronous including winding overhang
Motor three-dimensional finite element stereochemical structure, defines the material properties of each structure division afterwards, arranges external circuit connection side
Formula, arranges finite element calculation of boundary conditions, finally motor model is carried out mesh generation, can carry out transient field road coupling
Close analytical calculation.Permasyn morot three-dimensional finite element three-dimensional structure diagram is as shown in Figure 2.
2., by finite element transient state Coupled field and circuit analysis, the direct-axis synchronous inductance value of permasyn morot can be directly obtained
Ldd, quadrature axis synchronous inductance value Lqq, the quadrature axis mutual inductance value L in d-axisdqWith the d-axis mutual inductance value L in quadrature axisqd。
Because under different cross, straight shaft currents, armature mmf is different, the armature reacting field degree of saturation in motor is different, causes electricity
Reactance of armature reaction is different, and i.e. gained cross, straight axle synchronous inductance and cross-couplings inductance value are quadrature axis current, direct-axis current
Binary function, as shown in Figure 3.Phase resistance value R of permasyn morot, permanent magnet flux linkage value ψfAnd between temperature
Unary also can directly obtain.
3. eddy current and the automatic virtual blocks winding inductance of magnetic hystersis loss sum, resistance value within equivalence one electric cycle of motor
By introducing d-axis field damped coefficient KD, quadrature axis field damped coefficient KQDetermine.Particularly as follows: Wherein ψD' orient three-phase synthesis magnetic linkage when lower rotor part maintains static, ψ for d-axisDUnder orienting for d-axis
Three-phase synthesis magnetic linkage when rotor rotates with rated speed, ψQ' orient three-phase synthesis when lower rotor part maintains static for quadrature axis
Magnetic linkage, ψQThree-phase synthesis magnetic linkage when rotating with rated speed for quadrature axis orientation lower rotor part.If Δ θDFor ψD' and ψD's
Phase contrast, Δ θQFor ψQ' and ψQPhase contrast, then:
Wherein: RDFor d-axis automatic virtual blocks winding resistance, RQFor quadrature axis automatic virtual blocks winding resistance, LDDEmpty for d-axis
Intend the self-induction of Damper Winding, LQQFor the self-induction of quadrature axis automatic virtual blocks winding, f is power frequency, LdDFor synchronous motor
The amplitude of mutual inductance, L between stator phase winding and d-axis automatic virtual blocks windingqQVirtual with quadrature axis for synchronous motor stator phase winding
The amplitude of mutual inductance between Damper Winding.Because of LdD、LqQBeing virtual amount, the present invention uses direct-axis synchronous inductance meansigma methods
1% determines LdD, use the 1% of quadrature axis synchronous inductance meansigma methods to determine LqQ。
4. the asymmetric meeting of magnetic circuit that permanent magnet causes because magnetic circuit is saturated causes d-axis permanent magnet flux linkage ψdpmWith quadrature axis permanent-magnet magnetic
Chain ψqpmAmplitude is different, and the present invention uses saturation coefficient meter and this impact, it may be assumed that
ψdpM=(0.8~1.2) * ψf (5)
ψqpm=(0.8~1.2) * ψf (6)
5. set PmsIt is lost for permasyn morot mechanical friction, PsNStray loss during rated power is exported for motor,
The present invention uses empirical coefficient meter and the loss impact on motor performance, it may be assumed that
Wherein: η is motor operational efficiency, P is motor rated power.
6. according to the basic electromagnetic relation of permasyn morot, it is contemplated that the feature ginseng of reflection electric machine non-linear characteristic
Number, improves classical permagnetic synchronous motor voltage equation.The permagnetic synchronous motor voltage equation that the present invention proposes
As follows:
It should be understood that the non-salient pole that the permagnetic synchronous motor voltage equation that the present invention proposes is applicable not only in embodiment
Formula permagnetic synchronous motor, is equally applicable to salient-pole permanent-magnet synchronous motor;It is applicable not only to undamped winding on rotor
Permagnetic synchronous motor, is equally applicable on rotor the permagnetic synchronous motor having Damper Winding, now, LDDHinder for d-axis
The self-induction sum of the d-axis automatic virtual blocks winding that Buddhist nun's winding is lost with equivalence, LQQFor quadrature axis Damper Winding and equivalence loss
The self-induction sum of quadrature axis automatic virtual blocks winding, RDFor d-axis Damper Winding and d-axis automatic virtual blocks winding resistance sum,
RQFor quadrature axis Damper Winding and quadrature axis automatic virtual blocks winding resistance sum.
7., for meter and the loss of electric machine impact on permasyn morot electromagnetic torque, electromagnetic torque equation is made by the present invention
Following derivation.
The input power of permagnetic synchronous motor is:
In formula: PoutFor output power of motor;PmsIt is lost for electromechanics;PsFor stray loss of motor;PFeFor motor
Iron loss, i.e. eddy-current loss and magnetic hystersis loss sum;PcuFor copper wastage.Wherein:
Then the electromagnetic torque of motor is:
In formula: ωmFor rotor mechanical angle speed, P is motor number of pole-pairs.
8. supplement the equation of motion of motorThen can carry out permasyn morot Dynamic Simulation Model
Build, T in formulaLFor electric motor load torque, J is the rotary inertia sum of motor and load.Obtained by FEM calculation
To cross, straight axle synchronous inductance and cross-couplings inductance value utilize two dimension table look-up module to be input to variable element permanent magnet synchronous electric
The inductance input port of motivation phantom;The resistance value, the permanent magnet flux linkage value that vary with temperature utilize one-dimensional mould of tabling look-up
Block is input to the resistance of variable element permasyn morot phantom, magnetic linkage input port;For the equivalence loss of electric machine
Each constant parameter and other motor body constant parameters inputted by packaged parameter setting module;Motor load turns
Square, rotary inertia can need arbitrarily input according to actual measurement or emulation experiment.Change based on the finite element analysis ginseng built
Number permasyn morot Dynamic Simulation Models and parameter arrange as shown in Figure 4, Fig. 5 Yu Fig. 6 be according to formula (1),
The voltage equation within variable element permasyn morot Dynamic Simulation Model based on finite element analysis that formula (6) is built
With torque equation module.
For the feasibility of the present invention is described, 30KW permasyn morot model in above-described embodiment is carried out emulation and tests
Card.Motor main design parameters is: number of pole-pairs P=4, rated voltage 233V, rated current 98A, rated speed
3000rpm, torque at rated load 95.6Nm.Empty load of motor starts, and adds nominal load when 0.1s, during this
The parameter waveform figures such as three-phase current, three-phase voltage, rotating speed, torque are as shown in Figure 7, it is seen that, motor output parameter with
Design parameter has good concordance, it was demonstrated that the variable element permasyn morot of based on finite element analysis set up moves
The correctness of state phantom.
Claims (3)
1. a variable element permasyn morot modeling method based on finite element analysis, it is characterised in that step is as follows:
Step 1: according to the structural parameters of designed permasyn morot, set up the three-dimensional of permasyn morot
Finite element electromagnetic-field simulation model;
Step 2: use finite element transient field road coupling analytical method that phantom is carried out transient state Coupled field and circuit analysis,
Obtain direct-axis synchronous inductance value L of permasyn morot under different cross, straight shaft currentdd, quadrature axis synchronous inductance value Lqq、
The quadrature axis mutual inductance value L in d-axisdqWith the d-axis mutual inductance value L in quadrature axisqd, permasyn morot under different temperatures
Phase resistance value R and permanent magnet flux linkage value ψf;
Step 3: then calculate in equivalence one electric cycle of motor the quadrature axis automatic virtual blocks of eddy current and magnetic hystersis loss sum around
Group inductance value LQQ, resistance value RQWith d-axis automatic virtual blocks winding inductance value LDD, resistance value RD:
Wherein:ψD' orient three-phase synthesis magnetic linkage when lower rotor part maintains static for d-axis,
ψDThree-phase synthesis magnetic linkage when rotating with rated speed for d-axis orientation lower rotor part, ψQ' fix for quadrature axis orientation lower rotor part
Three-phase synthesis magnetic linkage when not turning, ψQThree-phase synthesis magnetic linkage when rotating with rated speed for quadrature axis orientation lower rotor part,
ΔθDFor ψD' and ψDPhase contrast, Δ θQFor ψQ' and ψQPhase contrast, f is power frequency, LdDFor synchronous motor
The amplitude of mutual inductance, L between stator phase winding and d-axis automatic virtual blocks windingqQVirtual with quadrature axis for synchronous motor stator phase winding
The amplitude of mutual inductance between Damper Winding;
Step 4: calculate d-axis permanent magnet flux linkage ψdpmWith quadrature axis permanent magnet flux linkage ψqpm:
ψdpm=(0.8~1.2) * ψf,
ψqpm=(0.8~1.2) * ψf,
Wherein: ψfFor permasyn morot saturation coefficient;
Determine that permasyn morot mechanical friction is lost PmsWith stray loss P during motor output rated powersN:
Wherein: η is motor operational efficiency, P is motor rated power;
Step 5: the motor characteristic parameter obtained with step 2~step 4, build permasyn morot voltage equation and
Torque equation:
Permasyn morot voltage equation is:
Permasyn morot torque equation is:
Wherein, d, q represent motor quadrature axis and d-axis, and R represents motor stator resistance, id、iqRepresent that motor is handed over straight
Shaft current, ω represents motor angular rate, PoutRepresenting output power of motor, p represents motor number of pole-pairs, ωmFor turning
Handset tool angular velocity, TmsRepresent frictional damping torque, iD, iQRepresent automatic virtual blocks winding ac-dc axis electric current;
Step 6: utilize motor to control class simulation software MATLAB/Simulink to the synchronous permanent-magnet motor in step 5
Machine voltage equation and torque equation are built, and obtain variable element permasyn morot based on finite element analysis dynamic
The model of simulation modeling.
Variable element permasyn morot modeling method based on finite element analysis, its feature the most according to claim 1
It is: described LdDFor direct-axis synchronous inductance LddThe 1% of meansigma methods.
Variable element permasyn morot modeling method based on finite element analysis, its feature the most according to claim 1
It is: described LqQFor quadrature axis synchronous inductance LqqThe 1% of meansigma methods.
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