CN109951125A - The evaluation method of used in new energy vehicles permanent magnet synchronous motor ac-dc axis inductance - Google Patents
The evaluation method of used in new energy vehicles permanent magnet synchronous motor ac-dc axis inductance Download PDFInfo
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- CN109951125A CN109951125A CN201910305960.1A CN201910305960A CN109951125A CN 109951125 A CN109951125 A CN 109951125A CN 201910305960 A CN201910305960 A CN 201910305960A CN 109951125 A CN109951125 A CN 109951125A
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Abstract
Following steps: step 1 the evaluation method of used in new energy vehicles permanent magnet synchronous motor ac-dc axis inductance of the present invention, obtains the motor phase resistance R of permanent magnet synchronous motors；Step 2, the permanent magnet flux linkage of permanent magnet synchronous motor is obtainedStep 3, d-axis inductance L is obtaineddAnd axis inductor.Compared with prior art, the present invention estimates the parameter of electric machine, the present invention estimates that ac-dc axis inductance, the more acurrate controlled motor characteristic of understanding improve the performance and efficiency of motor with following the utility model has the advantages that in permanent magnet synchronous motor control.The present invention provides a kind of calculation method demarcated test and estimate motor ac-dc axis inductance that is engineered with a motor, and a motor, which only needs to demarcate fitting, to be tested once, is saved each electric machine controller calculation amount, is simplified the operation of electric machine controller.
Description
Technical field
The present invention relates to motor control technology fields, and in particular, to a kind of pure electric automobile used in new energy vehicles permanent magnetism is same
Walk the evaluation method of motor ac-dc axis inductance.
Background technique
With the extensive use of New-energy electric vehicle, core of the motor controller as dynamic Control is right both at home and abroad
Automobile permanent magnet synchronous motor and its control performance requirement are higher and higher, and performance quality directly affects it and leads in electric car automobile
The development in domain.
(2) currently, the maximum technical bottleneck of electric car is cruising ability, the one of key factor of cruising ability size
It is the efficiency of motor driven systems, the height of electric system efficiency is the important performance characteristic of permanent magnet synchronous motor, for permanent magnetism
For synchronous motor, wants to reach higher efficiency and control performance, the parameter of controlled motor is needed to be grasped, including permanent magnet
Magnetic linkage, phase resistance and ac-dc axis inductance.
(3) permanent magnet synchronous motor parameter estimation is broadly divided into two kinds, the first is online real-time parameter estimation, passes through high frequency
Impulses injection voltage acquires feedback current to estimate parameter；Practical engineering application environment is more complex, and on-line parameter identification needs big
Measure data calculate, so for electric machine controller operational capability require it is stronger.Second offline parameter estimation, stable operation
When state, estimate that parameter, the present invention estimate approximating method, root using offline parameter according to motor dq shaft voltage and current model
Learn the Fitting Calculation parameter of electric machine relational expression equation coefficient according to the mass data of test calibration motor.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide a kind of used in new energy vehicles permanent magnet synchronous motors to hand over directly
The evaluation method of axle inductance.
In order to solve the above-mentioned technical problem, the estimation side of used in new energy vehicles permanent magnet synchronous motor ac-dc axis inductance of the present invention
Method, following steps:
Step 1, the motor phase resistance R of permanent magnet synchronous motor is obtaineds；
Step 2, the permanent magnet flux linkage of permanent magnet synchronous motor is obtained
Step 3, d-axis inductance L is obtaineddWith axis inductor Lq；Wherein
Lq=-(ud-Rs*id)/(we*iq)
In formula, iqFor quadrature axis current, idFor direct-axis current, uqFor quadrature-axis voltage, udFor direct-axis voltage, weFor the electric angle of motor
Degree.
Preferably, in step 1, motor phase resistance RsMeet:
In formula, vnFor motor rotation speed, PnFor motor number of pole-pairs.
Preferably, in step 2, permanent magnet flux linkageMeet:
In formula, u1000For motor when 1000RPM back-emf voltage.
Preferably, step 3 includes:
Step 3.1, the number of given ac-dc axis electric current, practical ac-dc axis electric current, practical ac-dc axis voltage and torque T e is established
According to library；
Step 3.2, the three rank least square fittings that multi-variable function is carried out to the data sample of actual measurement, obtain d-axis inductance
Ld, axis inductor LqWith quadrature axis current iq, direct-axis current idThe coefficient of function.
Preferably, torque T e meets:
Preferably, in step 3.2,
D-axis inductance LdMeet:
In formula, a0……a9For d-axis inductance LdWith quadrature axis current iq, direct-axis current idThe coefficient of function.
Preferably, in step 3.2, axis inductor LqMeet:
In formula, b0……b9For axis inductor LqWith quadrature axis current iq, direct-axis current idThe coefficient of function.
Compared with prior art, the present invention have it is following the utility model has the advantages that
(1) in permanent magnet synchronous motor control, the parameter of electric machine is estimated, the present invention estimates ac-dc axis inductance, more acurrate understanding
Controlled motor characteristic, improves the performance and efficiency of motor.
(2) present invention provides a kind of calculating side of engineering calibration test estimation motor ac-dc axis inductance with a motor
Method, a motor only need to demarcate fitting test once, save each electric machine controller calculation amount, simplify the fortune of electric machine controller
It calculates.
(3) present invention calculates analysis by off-line data and fitting obtains the parameter of electric machine, off-line measurement and database fitting
Out in parameter list, when motor is under actual operating mode, it can be gone out under the conditions of current steady state by polynomial computation of tabling look-up
The parameter of electric machine is brought into control strategy and is used, and can be improved electric system performance.
Without computation of table lookup, the memory capacity of CPU is saved.The database fitting meter that the method is demarcated by off-line test
It calculates, it is final to obtain dq shaft current and inductance relation function, after calculating relation function, electricity is calculated in real-time control system application
The algorithm of sense is simple, saves CPU operation time, the parameter of electric machine, which is accurately estimated, can be improved electric machine controller Performance And Reliability.
Detailed description of the invention
Fig. 1 is the evaluation method schematic diagram of used in new energy vehicles permanent magnet synchronous motor ac-dc axis inductance of the present invention.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, several changes and improvements can also be made.These belong to the present invention
Protection scope.
As shown in Figure 1, the invention proposes a kind of evaluation method of used in new energy vehicles permanent magnet synchronous motor ac-dc axis inductance,
Need following parameter definition, we: the electrical angle of motor；vn: motor rotation speed；Pn: motor number of pole-pairs；Ld: motor d axle inductance；
Lq: motor q axle inductance；id: motor d shaft current；iq: motor q shaft current；ud: motor d shaft current；uq: motor q shaft current；Rs:
Motor phase resistance；The magnetic linkage of motor permanent magnet；u1000: motor back-emf voltage when 1000RPM.
Test macro the revolving speed 1000RPM, w of this method fixed dynamometereWithIt is constant.It is read and is controlled by host computer
The parameter and record of device in the database, including give dq electric current, practical dq electric current, dq voltage and torque, pass through following public affairs
Ac-dc axis inductance L is calculated in formuladAnd Lq。
Lq=-(ud-Rs*id)/(we*iq)
(3) according to the database for giving dq electric current, dq voltage and torque, the database sample of actual measurement carries out multi-variable function
Three rank least square fittings, obtain fitting obtain the coefficient of each factor.Wherein a0……a9It is fitted LdWith idAnd iqFunction is
Number；b0……b9It is fitted LqWith idAnd iqThe coefficient of function.
The present invention is a kind of offline engineering parameter of electric machine estimation, and following flow chart, first electromechanical testing rack prepare, survey
Motor zero calibration and the adjustment of zero torque of rack are tried, then adds a voltage to pass through Ohm's law measuring and calculation machine winding,
Motor idle running 1000RPM, measures counter electromotive force, brings intoFormula；Then, by the parameter of host computer Read Controller and
Record in the database, including gives dq electric current, practical dq electric current, dq voltage and torque, finally according to the database sample of actual measurement
Three rank least square fittings of this progress multi-variable function, obtain the coefficient of dq electric current Yu ac-dc axis inductance.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow
Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (7)
1. a kind of evaluation method of used in new energy vehicles permanent magnet synchronous motor ac-dc axis inductance, which comprises the steps of:
Step 1, the motor phase resistance R of permanent magnet synchronous motor is obtaineds；
Step 2, the permanent magnet flux linkage of permanent magnet synchronous motor is obtained
Step 3, d-axis inductance L is obtaineddWith axis inductor Lq；Wherein
Lq=-(ud-Rs*id)/(we*iq)
In formula, iqFor quadrature axis current, idFor direct-axis current, uqFor quadrature-axis voltage, udFor direct-axis voltage, weFor the electrical angle of motor.
2. the evaluation method of used in new energy vehicles permanent magnet synchronous motor ac-dc axis inductance according to claim 1, feature exist
In, in step 1, motor phase resistance RsMeet:
In formula, vnFor motor rotation speed, PnFor motor number of pole-pairs.
3. the evaluation method of used in new energy vehicles permanent magnet synchronous motor ac-dc axis inductance according to claim 1, feature exist
In, in step 2, permanent magnet flux linkageMeet:
In formula, u1000For motor when 1000RPM back-emf voltage.
4. the evaluation method of used in new energy vehicles permanent magnet synchronous motor ac-dc axis inductance according to claim 1, feature exist
In step 3 includes:
Step 3.1, the database of given ac-dc axis electric current, practical ac-dc axis electric current, practical ac-dc axis voltage and torque T e is established；
Step 3.2, the three rank least square fittings that multi-variable function is carried out to the data sample of actual measurement, obtain d-axis inductance Ld, hand over
Axle inductance LqWith quadrature axis current iq, direct-axis current idThe coefficient of function.
5. the evaluation method of used in new energy vehicles permanent magnet synchronous motor ac-dc axis inductance according to claim 4, feature exist
In torque T e meets:
6. the evaluation method of used in new energy vehicles permanent magnet synchronous motor ac-dc axis inductance according to claim 4, feature exist
In, in step 3.2,
D-axis inductance LdMeet:
In formula, a0……a9For d-axis inductance LdWith quadrature axis current iq, direct-axis current idThe coefficient of function.
7. the evaluation method of used in new energy vehicles permanent magnet synchronous motor ac-dc axis inductance according to claim 4, feature exist
In, in step 3.2, axis inductor LqMeet:
In formula, b0……b9For axis inductor LqWith quadrature axis current iq, direct-axis current idThe coefficient of function.
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Cited By (2)
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| CN110460282A (en) * | 2019-08-22 | 2019-11-15 | 东风航盛（武汉）汽车控制系统有限公司 | A kind of automatic calibration method of permanent magnet synchronous motor inductance parameters |
| CN111697890A (en) * | 2020-05-28 | 2020-09-22 | 格至控智能动力科技（上海）有限公司 | Torque estimation method for permanent magnet and hybrid excitation synchronous motor |
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