CN108288935A - A kind of permanent magnet synchronous motor inductance parameters acquisition methods and system - Google Patents
A kind of permanent magnet synchronous motor inductance parameters acquisition methods and system Download PDFInfo
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- CN108288935A CN108288935A CN201810143014.7A CN201810143014A CN108288935A CN 108288935 A CN108288935 A CN 108288935A CN 201810143014 A CN201810143014 A CN 201810143014A CN 108288935 A CN108288935 A CN 108288935A
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
- H02P21/141—Flux estimation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
- H02P21/18—Estimation of position or speed
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/022—Synchronous motors
- H02P25/03—Synchronous motors with brushless excitation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
Abstract
The invention discloses a kind of permanent magnet synchronous motor inductance parameters acquisition methods and system, this method to include：Permanent magnet synchronous motor is dragged to specify rotating speed zero load to rotate by external force, then the first voltage for specifying the current regulation unit of the frequency of permanent magnet synchronous motor and permanent magnet synchronous motor output under rotating speed is obtained, magnetic linkage is obtained then according to the frequency and the first voltage, quadrature axis inductance when can obtain d-axis inductance when applying different direct-axis currents respectively according to the magnetic linkage and apply different quadrature axis currents.Using the present invention inductance parameters are obtained without relying on the phase resistance of motor, but according to Feedforward Decoupling principle in permanent magnet synchronous motor vector controlled, tested motor zero load control, only application direct-axis current are controlled respectively and only totally three big steps can accurately obtain the inductance parameters of magneto to the control of application quadrature axis current.
Description
Technical field
The present invention relates to motor control technology field, more particularly to a kind of permanent magnet synchronous motor inductance parameters acquisition methods and
System.
Background technology
Permanent magnet synchronous motor is low in energy consumption, and efficient, speed-regulating range width is widely used in electric vehicle field.In order to make
It obtains permanent magnet synchronous motor and reaches excellent control performance, motor control mostly uses vector control algorithm, to permanent magnet synchronous motor
Carry out vector controlled when, there are cross-coupling components between quadrature axis and d-axis, when motor operation operating mode changes, can because
The presence of coupled component, and make the quadrature axis current of motor, direct-axis current interaction, influence the dynamic property of motor.So
Decoupling control would generally be carried out to motor, most commonly Feedforward Decoupling and feedback decoupling, this two classes decoupling method all relies on
The parameters such as the inductance of motor, so carrying out identification to parameters such as motor inductances seems critically important.
The parameter of electric machine needed for the decoupling control of synchronous motor is motor magnetic linkage ψ f, motor d-axis inductance LdWith motor quadrature axis electricity
Feel Lq.The cross, straight axle inductance generally use pulse voltage ballistic method of identification synchronous motor at present.Apply fixed d-axis to motor
(d axis) pulse voltage samples d axis feedback currents, according to formulaExtrapolation obtains d axle inductances.Together
Reason applies fixed quadrature axis (q axis) pulse voltage to motor, q axis feedback currents is sampled, according to formulaInstead
It pushes away and q axle inductances is calculated.
However, the acquisition of inductance parameters relies on the phase resistance Rs of motor, the precision of phase resistance Rs can influence to recognize inductance ginseng
Several precision.In addition, the fixed voltage amplitude applied is not easy to choose, voltage magnitude is excessive to be easy to cause overcurrent, voltage magnitude mistake
Low current is too small, it is not easy to detect.Therefore, the prior art is more difficult obtains accurate inductance parameters.
Invention content
The present invention provides a kind of permanent magnet synchronous motor inductance parameters acquisition methods and system, solve that the prior art is more difficult to be obtained
The problem of taking accurate inductance parameters.
The present invention provides a kind of permanent magnet synchronous motor inductance parameters acquisition methods, including：
Permanent magnet synchronous motor is dragged to specify rotating speed zero load to rotate by external force；
It obtains and specifies the of the current regulation unit of the frequency of permanent magnet synchronous motor and permanent magnet synchronous motor output under rotating speed
One voltage；
Magnetic linkage is obtained according to the frequency and the first voltage；
It obtains d-axis inductance when applying different direct-axis currents respectively according to the magnetic linkage and applies different quadrature axis currents
When quadrature axis inductance.
Preferably, the d-axis inductance obtained respectively according to the magnetic linkage when applying different direct-axis currents and application
Quadrature axis inductance when different quadrature axis currents includes：
For d-axis inductance：
Quadrature axis current is set as 0；
It is stepped up the negative sense direct-axis current applied to permanent magnet synchronous motor from zero according to the first setting step-length, is acquired respectively
The voltage of the current regulation unit output of permanent magnet synchronous motor when applying different direct-axis currents；
According to the voltage, the magnetic linkage with the frequency acquisition difference direct-axis current corresponding d-axis inductance, until reach
To the first termination condition；
Store the corresponding d-axis inductance of different direct-axis currents；
For quadrature axis inductance：
Direct-axis current is set as 0；
It is stepped up the quadrature axis current applied to permanent magnet synchronous motor from zero according to the second setting step-length, acquisition respectively applies
The voltage of the current regulation unit output of permanent magnet synchronous motor when different quadrature axis currents；
According to the voltage, the magnetic linkage with the frequency acquisition difference quadrature axis current corresponding quadrature axis inductance, until reach
To the second termination condition；
Store the corresponding quadrature axis inductance of different quadrature axis currents.
Preferably, first termination condition is：First setting step-length increases the motor peak value electricity of number ＞ specified multiples
The ratio of stream and the first setting step-length；
Second termination condition is：Machine phase voltages >=inverter poles voltage limit.
Preferably, when first voltage is perunit value, first voltage is converted into actual value；
When voltage is perunit value, actual value is converted voltages into.
Preferably, described to include to specify rotating speed zero load to rotate by external force dragging permanent magnet synchronous motor：
The shaft of prime mover and permanent magnet synchronous motor is coaxially connected；
Rotating speed by controlling prime mover makes permanent magnet synchronous motor to specify rotating speed zero load to rotate.
Correspondingly, the present invention also provides a kind of permanent magnet synchronous motor inductance parameters to obtain system, including：
Permanent magnet synchronous motor, inverter bridge, rotor angle computing unit, inductance computing unit, current regulation unit, voltage become
Change unit, current transformation unit, tested motor current detecting unit and modulation hair wave unit, permanent magnet synchronous motor respectively with inversion
Bridge, rotor angle computing unit are connected with inductance computing unit, tested motor current detecting unit, current transformation unit, electric current
Adjust unit, voltage transformation module, modulation hair wave unit be sequentially connected with inverter bridge, rotor angle computing unit also respectively with electricity
Flow converter unit, modulation hair wave unit is connected；
The permanent magnet synchronous motor is dragged by external force to specify rotating speed zero load to rotate；
The tested motor current detecting unit be used to detect permanent magnet synchronous motor it is dragged when the induced current that generates, and
It is sent to current transformation unit；
The rotor angle computing unit is used to position angle being sent to modulation hair wave unit and current transformation unit；
The current transformation unit is used to the induced current of reception and position angle being converted to quadrature axis current and direct-axis current,
And it is sent to current regulation unit；
The current regulation unit is used to the quadrature axis current of reception and direct-axis current being converted to quadrature-axis voltage and d-axis electricity
Pressure, and it is sent to voltage transformation module；
The modulation hair wave unit is used to carry out the voltage after voltage transformation module changes received according to position angle
After harmonic, exported to permanent magnet motor via inverter bridge；
The inductance computing unit for according to the magnetic linkage respectively obtains application different direct-axis currents when d-axis inductance,
And quadrature axis inductance when the different quadrature axis currents of application.
Preferably, the current regulation unit is specifically used for, for d-axis inductance：Quadrature axis current is set as 0；According to first
Setting step-length is stepped up the negative sense direct-axis current applied to permanent magnet synchronous motor from zero, until reaching the first termination condition；With
And
For quadrature axis inductance：Direct-axis current is set as 0；It is stepped up from zero to permanent magnet synchronous electric according to the second setting step-length
The quadrature axis current that machine applies, until reaching the second termination condition.
Preferably, first termination condition is：First setting step-length increases the motor peak value electricity of number ＞ specified multiples
The ratio of stream and the first setting step-length；
Second termination condition is：Machine phase voltages >=inverter poles voltage limit.
Preferably, the inverter bridge is also connected with the inductance computing unit, and inverter is expired tune voltage by the inverter bridge
It is sent to the inductance computing unit, the inductance computing unit is specifically used for, when voltage is perunit value, converting voltages into
Actual value.
Preferably, the system also includes：
Prime mover and prime mover rotary speed controling unit, prime mover rotary speed controling unit are electrically connected with prime mover, prime mover with
The shaft of permanent magnet synchronous motor is coaxially connected；
Prime mover rotary speed controling unit is used to make permanent magnet synchronous motor by controlling the rotating speed of prime mover to specify
Rotating speed zero load rotates.
It is same to drag permanent magnetism by external force for a kind of permanent magnet synchronous motor inductance parameters acquisition methods provided by the invention and system
It walks motor to rotate with specified rotating speed zero load, then obtains and specify the frequency of permanent magnet synchronous motor and permanent magnet synchronous motor under rotating speed
The first voltage of current regulation unit output obtains magnetic linkage then according to the frequency and the first voltage, can be according to institute
State quadrature axis inductance when magnetic linkage obtains d-axis inductance when applying different direct-axis currents and applies different quadrature axis currents respectively.
Using the present invention inductance parameters are obtained without relying on the phase resistance Rs of motor, but according to before in permanent magnet synchronous motor vector controlled
Present decoupling principle, respectively to tested motor zero load control, only apply direct-axis current control and only apply quadrature axis current control totally three
Big step can accurately obtain the inductance parameters of magneto.
Further, permanent magnet synchronous motor inductance parameters acquisition methods provided by the invention and system, provide according to magnetic
The method that chain obtains d-axis inductance and quadrature axis inductance, and be not related to applying fixed voltage, and it is provided with termination condition, it will not cause
Overcurrent and damage motor, can be with effective protection motor.
Further, permanent magnet synchronous motor inductance parameters acquisition methods provided by the invention and system, according to quadrature axis inductance
With the characteristic of d-axis inductance, it is respectively provided with different stop conditions, can preferably protect permanent magnet synchronous motor in this way.
Description of the drawings
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only one described in the present invention
A little embodiments, for those of ordinary skill in the art, other drawings may also be obtained based on these drawings.
Fig. 1 is the first flow according to permanent magnet synchronous motor inductance parameters acquisition methods provided in an embodiment of the present invention
Figure；
Fig. 2 is a kind of flow chart according to the method provided in an embodiment of the present invention for obtaining inductance according to magnetic linkage；
What Fig. 3 was provided according to embodiments of the present invention makes a kind of flow that permanent magnet synchronous motor is rotated with command speed zero load
Figure；
Fig. 4 is to be shown according to the first structure of permanent magnet synchronous motor inductance parameters provided in an embodiment of the present invention acquisition system
It is intended to；
Fig. 5 is to be shown according to second of structure of permanent magnet synchronous motor inductance parameters provided in an embodiment of the present invention acquisition system
It is intended to.
Specific implementation mode
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar parameter or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and is only used for explaining the present invention, and is not construed as limiting the claims.
Technical solution in order to better understand the present invention and technique effect, below with reference to flow diagram to specific
Embodiment is described in detail.As shown in Figure 1, to be obtained according to permanent magnet synchronous motor inductance parameters provided in an embodiment of the present invention
The first flow chart of method, this method is taken to may comprise steps of：
Step S01 drags permanent magnet synchronous motor to specify rotating speed zero load to rotate by external force.
It in the present embodiment, can be by the power source drives such as exterior motor, engine permanent magnet synchronous motor to specify
Rotating speed zero load rotates.
Step S02 is obtained and is specified the frequency of permanent magnet synchronous motor and the current regulation unit of permanent magnet synchronous motor under rotating speed
The first voltage of output.
The frequency w of permanent magnet synchronous motoreIt can be calculated according to formula (1)：
Wherein, p is motor number of pole-pairs, nrefTo specify rotating speed, n is takenrefFor 0.6~1 times of tested motor rated speed and guarantor
The non-loaded line counter electromotive force demonstrate,proved under this rotating speed completely adjusts voltage U less than 0.45~0.5 times of inverterdc。
When being rotated due to the rotor of permanent magnet synchronous motor, stator will produce induced electromotive force, which can be by forever
The current regulation unit output valve of magnetic-synchro motor obtains, value and first voltage UqIt is identical, first voltage UqWith magnetic linkage phase
It closes, therefore, magnetic linkage can be obtained by the first voltage.
Step S03 obtains magnetic linkage according to the frequency and the first voltage.
In the present embodiment, tested motor id*=0A, iq*=0A are given, according to the output quantity U of current regulation unitqMeter
Calculate permanent magnet flux linkage ψf, specifically magnetic linkage ψ can be obtained by formula (2)f, as follows：
Preferably, when first voltage be perunit value when, first voltage is converted into actual value, can by formula (3) into
Row conversion：
Wherein,For perunit base value.
Step S04 obtains d-axis inductance when applying different direct-axis currents according to the magnetic linkage and applies different respectively
Quadrature axis inductance when quadrature axis current.
Specifically, it can calculate separately according to the relationship between magnetic linkage, application electric current, inductance and apply different direct-axis currents
When d-axis inductance, apply quadrature axis inductance when different quadrature axis currents, wherein apply d-axis inductance L when different direct-axis currentsd
It can be calculated by formula (4)：
Wherein, id*, which refers to, applies reversed direct-axis current.
Apply quadrature axis inductance L when different quadrature axis currentsqIt can be calculated by formula (5)：
Wherein, iq* refers to application quadrature axis current.
When voltage is perunit value, formula (3) may be used and convert voltages into actual value.
Permanent-magnetic electric machine inductance can be varied from electric current is passed through, and can obtain the variation of inductance parameters and electric current through the invention
Curve.It should be noted that the acquisition of quadrature axis inductance and d-axis inductance is regardless of tandem.
It is same to drag permanent magnetism by external force for a kind of permanent magnet synchronous motor inductance parameters acquisition methods provided by the invention and system
It walks motor to rotate with specified rotating speed zero load, then obtains and specify the frequency of permanent magnet synchronous motor and permanent magnet synchronous motor under rotating speed
The first voltage of current regulation unit output obtains magnetic linkage then according to the frequency and the first voltage, can be according to institute
State quadrature axis inductance when magnetic linkage obtains d-axis inductance when applying different direct-axis currents and applies different quadrature axis currents respectively.
Using the present invention inductance parameters are obtained without relying on the phase resistance Rs of motor, but according to before in permanent magnet synchronous motor vector controlled
Present decoupling principle, respectively to tested motor zero load control, only apply direct-axis current control and only apply quadrature axis current control totally three
Big step can accurately obtain the inductance parameters of magneto.
As shown in Fig. 2, for according to a kind of flow chart of the method provided in an embodiment of the present invention for obtaining inductance according to magnetic linkage.
In the present embodiment, it is described according to the magnetic linkage respectively obtain apply different direct-axis currents when d-axis inductance, with
And quadrature axis inductance when applying different quadrature axis currents may comprise steps of：
For d-axis inductance：
Step S21 sets quadrature axis current as 0.Given iq*=0A, id*=-Ad_m。
Step S22 is stepped up the negative sense direct-axis current applied to permanent magnet synchronous motor according to the first setting step-length from zero,
The voltage of the current regulation unit output of permanent magnet synchronous motor when acquisition applies different direct-axis currents respectively.
Specifically, it can be accomplished by the following way：Id*=-Ad_m, Ad_m=m*idstep, m=(1,2,3 ... int
(0.7*ismax/idstep)), idstepIncrease step-length, id for id* electric currentsstepIt can use 0.1%~0.3% times of ismax, ismaxFor electricity
Machine peak point current.Wherein, int refers to rounding.
Step S23, according to the voltage, the magnetic linkage, corresponding d-axis is electric with the frequency acquisition difference direct-axis current
Sense, until reaching the first termination condition.
In the present embodiment, according to each id electric currents and the corresponding U of each id electric currentsq_m, permanent magnet flux linkage ψfCalculate different id electric currents
Under d-axis inductance Ld_m, shown in calculation formula such as formula (6)：
When current regulation unit exports UqFor perunit value, then Ld_mShown in calculation formula such as formula (7)：
Step S24 stores the corresponding d-axis inductance of different direct-axis currents.
For quadrature axis inductance：
Step S25 sets direct-axis current as 0.Given id*=0A.
Step S26 is stepped up the quadrature axis current applied to permanent magnet synchronous motor, respectively according to the second setting step-length from zero
The voltage of the current regulation unit output of permanent magnet synchronous motor when acquisition applies different quadrature axis currents.
In the present embodiment, iq*=Aq_n, Aq_n=n*iqstep, n=(1,2,3 ... int (ismax/iqstep)), iqstep
Increase step-length, iq for iq* electric currentsstepDesirable 0.1%~0.3%ismax, ismaxFor motor peak point current.
Step S27, according to the voltage, the magnetic linkage, corresponding quadrature axis is electric with the frequency acquisition difference quadrature axis current
Sense, until reaching the second termination condition.
In the present embodiment, according to the U under each iq electric currents and each iq electric currentsd_nCalculate the L under different iq electric currentsq_n, calculate
Shown in formula such as formula (8)：
Current regulation exports U in above formuladFor actual value, if current regulation exports UdFor perunit value, then Lq_nCalculation formula is such as
Shown in formula (9)：
Step S28 stores the corresponding quadrature axis inductance of different quadrature axis currents.
It should be noted that when quadrature axis inductance calculates, need to pay close attention to machine phase voltages Udq, when this is calculated with d-axis inductance
Focus it is different, it is therefore preferred that the first termination condition and the second termination condition differ, wherein described first terminates item
Part is：First setting step-length increases the ratio of the motor peak point current and the first setting step-length of number ＞ specified multiples；Described
Two termination conditions are：Machine phase voltages Udq>=inverter poles voltage limit Umax, when current regulation output is actual value, UmaxIt can be with
It is 0.88~0.92, when current regulation output is perunit value, UmaxCan it be 0.88~0.92 times
UdqShown in calculation formula such as formula (10)：
If UdqReach UmaxWhen, iq* electric currents stop increasing, LqParameter identification terminates.
As shown in figure 3, what is provided according to embodiments of the present invention makes what permanent magnet synchronous motor was rotated with command speed zero load
A kind of flow chart.
In the present embodiment, it is described by external force drag permanent magnet synchronous motor with specify rotating speed zero load rotate include following step
Suddenly：
Step S31, the shaft of prime mover and permanent magnet synchronous motor is coaxially connected.
Step S32, the rotating speed by controlling prime mover make permanent magnet synchronous motor to specify rotating speed zero load to rotate.
Method provided by the invention may be implemented to drag permanent magnet synchronous motor by external force to specify rotating speed zero load to rotate.
Correspondingly, the present invention also provides permanent magnetism corresponding with above-mentioned permanent magnet synchronous motor inductance parameters acquisition methods is same
Motor inductances parameter acquiring system is walked, as shown in figure 4, for according to permanent magnet synchronous motor inductance parameters provided in an embodiment of the present invention
The first structural schematic diagram of acquisition system.
In the present embodiment, permanent magnet synchronous motor inductance parameters obtain system, which is characterized in that including：
Permanent magnet synchronous motor, inverter bridge, rotor angle computing unit, inductance computing unit, current regulation unit, voltage become
Change unit, current transformation unit, tested motor current detecting unit and modulation hair wave unit, permanent magnet synchronous motor respectively with inversion
Bridge, rotor angle computing unit are connected with inductance computing unit, tested motor current detecting unit, current transformation unit, electric current
Adjust unit, voltage transformation module, modulation hair wave unit be sequentially connected with inverter bridge, rotor angle computing unit also respectively with electricity
Flow converter unit, modulation hair wave unit is connected.
Wherein, the permanent magnet synchronous motor is dragged by external force to specify rotating speed zero load to rotate；The tested motor electric current
Detection unit be used to detect permanent magnet synchronous motor it is dragged when the induced current that generates, and be sent to current transformation unit；It is described
Rotor angle computing unit is used to position angle theta being sent to modulation hair wave unit and current transformation unit；The electric current becomes
Unit is changed for the induced current of reception and position angle to be converted to quadrature axis current and direct-axis current, and is sent to current regulation list
Member；The current regulation unit is used to the quadrature axis current of reception and direct-axis current being converted to quadrature-axis voltage and direct-axis voltage, and
It is sent to voltage transformation module；The modulation hair wave unit be used for the voltage after voltage transformation module changes that will receive according to
After position angle carries out harmonic, exported to permanent magnet motor via inverter bridge；The inductance computing unit is used for according to the magnetic linkage
Quadrature axis inductance when obtaining d-axis inductance when applying different direct-axis currents respectively and applying different quadrature axis currents.
Preferably, the current regulation unit is specifically used for, for d-axis inductance：Quadrature axis current is set as 0；According to first
Setting step-length is stepped up the negative sense direct-axis current applied to permanent magnet synchronous motor from zero, until reaching the first termination condition；With
And for quadrature axis inductance：Direct-axis current is set as 0；It is stepped up from zero according to the second setting step-length and applies to permanent magnet synchronous motor
Quadrature axis current, until reach the second termination condition.
Wherein, first termination condition is：First setting step-length increases the motor peak point current of number ＞ specified multiples
With the ratio of the first setting step-length；Second termination condition is：Machine phase voltages >=inverter poles voltage limit.
Permanent magnet synchronous motor inductance parameters provided by the invention obtain system may not need by motor phase resistance Rs i.e.
Inductance parameters can accurately be obtained.
As shown in figure 5, to obtain the second of system according to permanent magnet synchronous motor inductance parameters provided in an embodiment of the present invention
Kind structural schematic diagram.
In the present embodiment, the system also includes：
Prime mover and prime mover rotary speed controling unit, prime mover rotary speed controling unit are electrically connected with prime mover, prime mover with
The shaft of permanent magnet synchronous motor is coaxially connected.
Prime mover rotary speed controling unit is used to make permanent magnet synchronous motor by controlling the rotating speed of prime mover to specify
Rotating speed zero load rotates.
Preferably, the inverter bridge is also connected with the inductance computing unit, and inverter is expired tune voltage by the inverter bridge
It is sent to the inductance computing unit, the inductance computing unit is specifically used for, when voltage is perunit value, converting voltages into
Actual value.
Each embodiment in this specification is described in a progressive manner, identical similar portion between each embodiment
Point just to refer each other.For system embodiment, since it is substantially similar to the method embodiment, so describing
Fairly simple, the relevent part can refer to the partial explaination of embodiments of method.System embodiment described above is only to show
Meaning property, wherein the unit illustrated as separating component may or may not be physically separated.It can root
According to actual need that some or all of module therein is selected to achieve the purpose of the solution of this embodiment.Ordinary skill
Personnel are without creative efforts, you can to understand and implement.
The embodiment of the present invention is described in detail above, specific implementation mode used herein carries out the present invention
It illustrates, the explanation of above example is only intended to help to understand the method and system of the present invention；Meanwhile for the one of this field
As technical staff, according to the thought of the present invention, there will be changes in the specific implementation manner and application range, to sum up institute
It states, the content of the present specification should not be construed as limiting the invention.
Claims (10)
1. a kind of permanent magnet synchronous motor inductance parameters acquisition methods, which is characterized in that including：
Permanent magnet synchronous motor is dragged to specify rotating speed zero load to rotate by external force；
Obtain the first electricity for specifying the current regulation unit of the frequency of permanent magnet synchronous motor and permanent magnet synchronous motor output under rotating speed
Pressure；
Magnetic linkage is obtained according to the frequency and the first voltage；
When obtaining d-axis inductance when applying different direct-axis currents respectively according to the magnetic linkage and applying different quadrature axis currents
Quadrature axis inductance.
2. according to the method described in claim 1, it is characterized in that, described obtained respectively according to the magnetic linkage applies different d-axis
D-axis inductance when electric current and quadrature axis inductance when applying different quadrature axis currents include：
For d-axis inductance：
Quadrature axis current is set as 0；
It is stepped up the negative sense direct-axis current applied to permanent magnet synchronous motor from zero according to the first setting step-length, acquisition respectively applies
The voltage of the current regulation unit output of permanent magnet synchronous motor when different direct-axis currents；
According to the voltage, the magnetic linkage with the frequency acquisition difference direct-axis current corresponding d-axis inductance, until reaching the
One termination condition；
Store the corresponding d-axis inductance of different direct-axis currents；
For quadrature axis inductance：
Direct-axis current is set as 0；
It is stepped up the quadrature axis current applied to permanent magnet synchronous motor from zero according to the second setting step-length, acquisition respectively applies different
The voltage of the current regulation unit output of permanent magnet synchronous motor when quadrature axis current；
According to the voltage, the magnetic linkage with the frequency acquisition difference quadrature axis current corresponding quadrature axis inductance, until reaching the
Two termination conditions；
Store the corresponding quadrature axis inductance of different quadrature axis currents.
3. according to the method described in claim 2, it is characterized in that,
First termination condition is：First setting step-length increases motor peak point current and the first setting of number ＞ specified multiples
The ratio of step-length；
Second termination condition is：Machine phase voltages >=inverter poles voltage limit.
4. according to the method in claim 2 or 3, which is characterized in that
When first voltage is perunit value, first voltage is converted into actual value；
When voltage is perunit value, actual value is converted voltages into.
5. according to the method described in claim 1, it is characterized in that, described turned by external force dragging permanent magnet synchronous motor with specifying
Fast zero load, which rotates, includes：
The shaft of prime mover and permanent magnet synchronous motor is coaxially connected；
Rotating speed by controlling prime mover makes permanent magnet synchronous motor to specify rotating speed zero load to rotate.
6. a kind of permanent magnet synchronous motor inductance parameters obtain system, which is characterized in that including：
Permanent magnet synchronous motor, inverter bridge, rotor angle computing unit, inductance computing unit, current regulation unit, voltage transformation list
Member, current transformation unit, tested motor current detecting unit and modulation hair wave unit, permanent magnet synchronous motor respectively with inverter bridge,
Rotor angle computing unit is connected with inductance computing unit, tested motor current detecting unit, current transformation unit, current regulation
Unit, voltage transformation module, modulation hair wave unit are sequentially connected with inverter bridge, and rotor angle computing unit also becomes with electric current respectively
Change unit, modulation hair wave unit is connected；
The permanent magnet synchronous motor is dragged by external force to specify rotating speed zero load to rotate；
The tested motor current detecting unit be used to detect permanent magnet synchronous motor it is dragged when the induced current that generates, and send
To current transformation unit；
The rotor angle computing unit is used to position angle being sent to modulation hair wave unit and current transformation unit；
The current transformation unit is used to the electric machine phase current of reception and position angle being converted to quadrature axis current and direct-axis current, and
It is sent to current regulation unit；
The current regulation unit is used to the quadrature axis current of reception and direct-axis current being converted to quadrature-axis voltage and direct-axis voltage, and
It is sent to voltage transformation module；
The voltage after voltage transformation module changes that the modulation hair wave unit is used to receive carries out harmonic according to position angle
Afterwards, it is exported to permanent magnet motor via inverter bridge；
The inductance computing unit for according to the magnetic linkage respectively obtains application different direct-axis currents when d-axis inductance and
Apply quadrature axis inductance when different quadrature axis currents.
7. system according to claim 6, which is characterized in that the current regulation unit is specifically used for, for d-axis electricity
Sense：Quadrature axis current is set as 0；According to the first setting step-length the negative sense d-axis electricity applied to permanent magnet synchronous motor is stepped up from zero
Stream, until reaching the first termination condition；And
For quadrature axis inductance：Direct-axis current is set as 0；It is stepped up from zero according to the second setting step-length and is applied to permanent magnet synchronous motor
The quadrature axis current added, until reaching the second termination condition.
8. system according to claim 7, which is characterized in that first termination condition is：First setting step-length increases
The ratio of the motor peak point current of number ＞ specified multiples and the first setting step-length；
Second termination condition is：Machine phase voltages >=inverter poles voltage limit.
9. system according to claim 7 or 8, which is characterized in that the inverter bridge also with the inductance computing unit phase
Even, the inverter bridge, which expires inverter, adjusts voltage to be sent to the inductance computing unit, and the inductance computing unit is specifically used for
When voltage is perunit value, actual value is converted voltages into.
10. system according to claim 6, which is characterized in that the system also includes：
Prime mover and prime mover rotary speed controling unit, prime mover rotary speed controling unit are electrically connected with prime mover, prime mover and permanent magnetism
The shaft of synchronous motor is coaxially connected；
Prime mover rotary speed controling unit is used to make permanent magnet synchronous motor by controlling the rotating speed of prime mover to specify rotating speed
Zero load rotation.
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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 |
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| CN114865888A (en) * | 2022-07-11 | 2022-08-05 | 广东电网有限责任公司肇庆供电局 | Power feedforward inductance parameter identification method and system for energy storage converter |
| CN117134672A (en) * | 2023-10-26 | 2023-11-28 | 深圳市法拉第电驱动有限公司 | Control method for feedforward compensation of current loop of permanent magnet synchronous motor |
| CN117134672B (en) * | 2023-10-26 | 2024-02-06 | 深圳市法拉第电驱动有限公司 | Control method for feedforward compensation of current loop of permanent magnet synchronous motor |
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