CN110474590A - A kind of mutual inductance static state discrimination method, device and the equipment of asynchronous machine - Google Patents
A kind of mutual inductance static state discrimination method, device and the equipment of asynchronous machine Download PDFInfo
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- CN110474590A CN110474590A CN201910809200.4A CN201910809200A CN110474590A CN 110474590 A CN110474590 A CN 110474590A CN 201910809200 A CN201910809200 A CN 201910809200A CN 110474590 A CN110474590 A CN 110474590A
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- 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
Abstract
The invention discloses a kind of mutual inductance static state discrimination methods of asynchronous machine, comprising: injects direct current to static asynchronous machine, and detects the voltage and current of direct current；Judge whether voltage and current reaches stable state；If so, calculating the mutual inductance of asynchronous machine according to the stator leakage inductance of voltage and current and asynchronous machine when reaching the voltage and current before stable state, reaching stable state；The present invention is by injecting direct current to static asynchronous machine, and detect the voltage and current of direct current, the transient process generated in machine winding using direct current, quickly calculate the mutual inductance of asynchronous machine, so as to complete the accurate recognition to mutual inductance parameter in the case where asynchronous machine remains static.In addition, the invention also discloses the mutual inductance static state device for identifying and equipment of a kind of asynchronous machine, equally there is above-mentioned beneficial effect.
Description
Technical field
The present invention relates to technical field of motors, in particular to the mutual inductance static state discrimination method of a kind of asynchronous machine, device and
Equipment.
Background technique
Mathematical model of the vector controlled based on motor is very strong to the dependence of the parameter of electric machine.Before normal operation, need
Pick out the relevant parameter of motor.Most of offline identification method is broadly divided into rotation identification at present and static identification is (static
Identification).Rotation identification can rapidly and accurately pick out mutual inductance and the no-load current of motor, but in most of applied field
It closes, since the load on motor shaft can not disengage, so can only be using static identification mutual inductance.
In the prior art, the method for the mutual inductance of static identification asynchronous machine is mostly based on single phase ac injection, recognizes the time
The problems such as long and Identification Errors are big, and Injection Current frequency is very big on identification precision influence.
Therefore, how fast and accurately static identification is carried out to the mutual inductance of asynchronous machine, in the static shape of asynchronous machine
Under state, mutual inductance parameter is identified, realizes urgent problem now.
Summary of the invention
The object of the present invention is to provide mutual inductance static state discrimination method, device and the equipment of a kind of asynchronous machine, to pass through note
The mode for entering direct current carries out fast and accurately static recognize to the mutual inductance of asynchronous machine.
In order to solve the above technical problems, the present invention provides a kind of mutual inductance static state discrimination method of asynchronous machine, comprising:
Direct current is injected to static asynchronous machine, and detects the voltage and current of the direct current；
Judge whether the voltage and the electric current reach stable state；
If so, being leaked according to the stator of first voltage, the first electric current, second voltage, the second electric current and the asynchronous machine
Sense, calculates the mutual inductance of the asynchronous machine；Wherein, the first voltage and first electric current are respectively to reach the institute before stable state
Voltage and the electric current are stated, the second voltage and second electric current are respectively the voltage and the electricity when reaching stable state
Stream.
It is optionally, described to inject direct current to static asynchronous machine, comprising:
It controls frequency converter and exports the direct current to the asynchronous machine；Wherein, the voltage and the electric current are respectively
The output voltage and output electric current of the frequency converter.
It is optionally, described to judge whether the voltage and the electric current reach stable state, comprising:
Judge the difference in the first preset time period between current flow and next electric current whether in the first preset range
It is interior；
If so, using first current flow in first preset time period as electricity when reaching stable state
Stream, using the corresponding current voltage of first current flow in first preset time period as electricity when reaching stable state
Pressure, and execute it is described according to first voltage, the first electric current, second voltage, the stator leakage inductance of the second electric current and the asynchronous machine,
The step of calculating the mutual inductance of the asynchronous machine.
Optionally, described to be determined according to first voltage, the first electric current, second voltage, the second electric current and the asynchronous machine
Sub- leakage inductance calculates the mutual inductance of the asynchronous machine, comprising:
According to the voltage and the electric current when reaching the voltage before stable state and the electric current and reaching stable state, benefit
WithStator inductance value is calculated；Wherein, LsFor the stator inductance value, IsFor
Second electric current, k are the detection moment of the voltage and the electric current, k=0 ..., N；usIt (k) is the voltage, us(N) it is
The second voltage, isIt (k) is the electric current, T is default calculating cycle, RsFor stator resistance；
The difference for calculating the stator inductance value and the stator leakage inductance, obtains the mutual inductance.
Optionally, the default calculating cycle is identical as the carrier cycle of frequency converter for exporting the direct current.
The present invention also provides a kind of mutual inductance static state device for identifying of asynchronous machine, comprising:
Export detection unit, for injecting direct current to static asynchronous machine, and detect the direct current voltage and
Electric current；
Judging unit, for judging whether the voltage and the electric current reach stable state；
Computing unit, if for reaching stable state, according to first voltage, the first electric current, second voltage, the second electric current and institute
The stator leakage inductance for stating asynchronous machine calculates the mutual inductance of the asynchronous machine；Wherein, the first voltage and first electric current point
The voltage and the electric current before stable state Wei not reached, the second voltage and second electric current are respectively when reaching stable state
The voltage and the electric current.
Optionally, the output detection unit, comprising:
Subelement is controlled, exports the direct current to the asynchronous machine for controlling frequency converter；Wherein, the voltage and
The electric current is respectively the output voltage and output electric current of the frequency converter.
Optionally, the judging unit, comprising:
Judgment sub-unit, for judging whether the difference in the first preset time period between current flow and next electric current is equal
In the first preset range；
Transmission sub-unit, if in first preset range, by the in first preset time period
One current flow is as electric current when reaching stable state, by first current flow pair in first preset time period
The current voltage answered sends enabling signal as voltage when reaching stable state, and to the computing unit.
Optionally, the computing unit, comprising:
First computation subunit, for according to institute when reaching the voltage before stable state and the electric current and reaching stable state
Voltage and the electric current are stated, is utilizedStator inductance value is calculated；Wherein, LsFor
The stator inductance value, IsFor second electric current, k is the detection moment of the voltage and the electric current, k=0 ..., N；us
It (k) is the voltage, usIt (N) is the second voltage, isIt (k) is the electric current, T is default calculating cycle, RsFor stator electricity
Resistance；
Second computation subunit obtains the mutual inductance for calculating the difference of the stator inductance value and the stator leakage inductance.
In addition, the present invention also provides a kind of mutual inductance static state identification apparatus of asynchronous machine, comprising:
Memory, for storing computer program；
Processor realizes that the mutual inductance of asynchronous machine as described in any one of the above embodiments is quiet when for executing the computer program
The step of state discrimination method.
The mutual inductance static state discrimination method of a kind of asynchronous machine provided by the present invention, comprising: infused to static asynchronous machine
Enter direct current, and detects the voltage and current of direct current；Judge whether voltage and current reaches stable state；If so, according to reaching
The stator leakage inductance of voltage and current before stable state, voltage and current when reaching stable state and asynchronous machine, calculates asynchronous machine
Mutual inductance；
As it can be seen that the present invention is by injecting direct current to static asynchronous machine, and detects the voltage and current of direct current, benefit
The transient process generated in machine winding with direct current calculates the mutual inductance of asynchronous machine, quickly so as in asynchronous machine
In the case where remaining static, the accurate recognition to mutual inductance parameter is completed.In addition, the present invention also provides a kind of asynchronous machines
Mutual inductance static state device for identifying and equipment, equally have above-mentioned beneficial effect.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of flow chart of the mutual inductance static state discrimination method of asynchronous machine provided by the embodiment of the present invention；
Fig. 2 is a kind of schematic diagram of the T-type equivalent circuit of threephase asynchronous machine provided by the embodiment of the present invention；
U phase current and voltage when Fig. 3 is a kind of threephase asynchronous machine injection direct current provided by the embodiment of the present invention
Waveform diagram；
Fig. 4 is a kind of structural block diagram of the mutual inductance static state device for identifying of asynchronous machine provided by the embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Referring to FIG. 1, Fig. 1 is a kind of stream of the mutual inductance static state discrimination method of asynchronous machine provided by the embodiment of the present invention
Cheng Tu.This method may include:
Step 101: injecting direct current to static asynchronous machine, and detect the voltage and current of direct current.
It is understood that the purpose of this step can be for by static asynchronous machine (such as asynchronous motor and different
Walk generator) injection direct current, make the machine winding of asynchronous machine that direct current can be injected, thus by detecting to asynchronous machine
The voltage value and current value of the direct current of output determine that direct current reaches the transient process in steady-state process in machine winding,
Fast and accurately to recognize the mutual inductance of asynchronous machine using the transient process；It and is to hand over by asynchronous machine in this present embodiment
Galvanic electricity machine, motor shaft not can rotate during injecting direct current to asynchronous machine, and asynchronous machine is maintained through static, realization mutual inductance
Static identification.
Specifically, the concrete mode of direct current, Ke Yiyou are injected to static asynchronous machine for processor in this step
Designer can pass through electric current according to practical scene and user demand self-setting, such as processor in frequency converter (driver)
The setting of the software modules such as sampling, current regulation, PWM hair wave, controls the frequency converter to static asynchronous machine and injects (output)
Direct current；Processor in host computer can also be by controlling the direct current output equipment such as frequency converter to static asynchronous machine
Inject direct current.As long as processor can inject direct current to static asynchronous machine, the present embodiment does not do any restrictions to this.
It is corresponding, when processor control frequency converter injects direct current to static asynchronous machine, detected in this step straight
The voltage and current of galvanic electricity can be respectively the output voltage and output electric current of frequency converter.
Step 102: judging whether voltage and current reaches stable state；If so, entering step 103.
It is understood that the purpose of this step can for by judge to asynchronous machine export direct current voltage with
Whether electric current reaches stable state, the transient state mistake that direct current needed for determining the mutual inductance for detecting the asynchronous machine is generated in the asynchronous machine
Whether journey is completed, so that, using the voltage and current detected in the transient process, calculating should after the completion of the transient process
The mutual inductance of asynchronous machine.By taking the U phase of threephase asynchronous machine shown in Fig. 3 as an example, direct current, U phase electricity are being injected to asynchronous machine
Stream and U phase voltage can reach stable state after transient process.
Specifically, judging whether voltage and current reaches the concrete mode of stable state, Ke Yishe for processor in this step
Meter personnel's self-setting can such as be used and be realized with the same or similar mode of steady state detecting method for use in the prior art, such as
It may determine that whether the difference between two electric currents adjacent in the multiple electric currents for detecting and obtaining in the first preset time period exists
In first preset range, or judge to detect in the second preset time period between two voltages adjacent in obtained multiple voltages
Difference whether in the second preset range；If so, can determine that voltage and current reaches stable state in injection machine winding.
As long as processor may determine that whether voltage and current reaches stable state, the present embodiment does not do any restrictions to this.
That is, this step may include the difference judged in the first preset time period between current flow and next electric current
Whether value is in the first preset range；If so, using first current flow in the first preset time period as reaching steady
Electric current when state, using the corresponding current voltage of first current flow in the first preset time period as electricity when reaching stable state
Pressure enters back into step 103 and executes according to the voltage and current and asynchronous electricity when reaching the voltage and current before stable state, reaching stable state
The stator leakage inductance of machine, the step of calculating the mutual inductance of asynchronous machine.I.e. by judging that current flow is under in the first preset time period
After the electric current and the voltage whether difference between one electric current can confirmly detect in the first preset range reach stable state, from
And using first current flow in the first preset time period as electric current when reaching stable state, and will be in the first preset time period
First current flow at the time of the corresponding voltage (current voltage) detected as voltage when reaching stable state.Equally
, whether this step also may include judging difference in the second preset time period between current voltage and next voltage
In two preset ranges；If so, using first current voltage in the second preset time period as voltage when reaching stable state, it will
The corresponding current flow of first current voltage in second preset time period enters back into step as electric current when reaching stable state
103 execute the stator leakage inductance according to voltage and current and asynchronous machine when reaching the voltage and current before stable state, reaching stable state,
The step of calculating the mutual inductance of asynchronous machine.
It is corresponding, whether can reach stable state with real-time judge voltage and current in this step, to determine that voltage and current is equal
Reach the initial time of stable state, i.e., the finish time of transient process needed for detecting the mutual inductance of asynchronous machine in the present embodiment.
That is the sequence of electric current that above-mentioned first preset time period can be obtained according to detection, successively with the detection of each electric current when
Between be starting point；The sequence for the voltage that above-mentioned second preset time period can be obtained according to detection, successively with the detection of each voltage
Time is starting point；Determine that the electric current in the first preset time period is in the voltage in stable state or the second preset time period in first time
When in stable state, by the detection moment of first electric current in first preset time period or will be in second preset time period
The detection moment of first voltage reaches the initial time of stable state as voltage and current.
It should be noted that the case where not reaching stable state for voltage and current in this step, can continue to detection
Obtained voltage and current is judged, until voltage and current reaches stable state.
Step 103: according to first voltage, the first electric current, second voltage, the stator leakage inductance of the second electric current and asynchronous machine,
Calculate the mutual inductance of asynchronous machine.
Wherein, the first voltage in this step and the first electric current can be respectively detected in step 101 reach stable state
Preceding voltage and current, second voltage and the second electric current can be respectively voltage when reaching stable state detected in step 101
And electric current.
It is understood that the purpose of this step can be to utilize the transient state mistake generated to the injection direct current of asynchronous machine
The mutual inductance of asynchronous machine is calculated in the stator leakage inductance of the voltage and current and asynchronous machine that detect in journey.
Wherein, the first voltage in this step and the first electric current, that is, the voltage and current before reaching stable state can be voltage
Reach the voltage and current detected before stable state with electric current, second voltage and the second electric current in this step reach steady
Voltage and current when state can reach the voltage and current that the onset detection of stable state obtains for voltage and current.It is right
The step of answering, the voltage and current that storage detection obtains can also be saved in step 101.
Specifically, for the specific acquisition modes of the stator leakage inductance of asynchronous machine in this step, as processor can be direct
Receive the stator leakage inductance of user's input；Also pre-stored stator leakage inductance can be used；Single phase ac injection side can also be passed through
Formula, detection obtain the stator leakage inductance of asynchronous machine.The present embodiment does not do any restrictions to this.
It should be noted that the concrete mode of the mutual inductance of asynchronous machine is calculated for processor in this step, it can be by setting
When meter personnel's self-setting such as asynchronous machine is threephase asynchronous machine, T-type equivalent circuit according to Fig.2, asynchronous machine
Rotor voltage equation can be with are as follows:
In formula (1), usFor stator voltage, i.e., the voltage of the direct current exported to asynchronous machine；isFor stator current, i.e., to
The voltage of the direct current of asynchronous machine output；RsFor stator resistance, RrFor rotor resistance, isFor stator current, irFor rotor electricity
Stream, ψsFor stator magnetic linkage, ψrFor rotor flux.；E in Fig. 2gFor induced electromotive force (Based Motional Electromotive Force), erFor rotor induction
Kinetic potential.
Rotor flux linkage equations can be with are as follows:
In formula (2), ψsFor stator magnetic linkage, ψsσFor stator interlinked leakage, ψgFor air gap flux linkage, ψrFor rotor flux.
ψg=Lmig=Lm(is+ir) (4)
In formula (3), LsσFor stator leakage inductance, LrσFor rotor leakage inductance；In formula (4), LmFor the mutual inductance of asynchronous machine.
Formula (3) and (4) are substituted into formula (2), can be obtained:
In formula (5), Ls=Lm+Lsσ, Lr=Lm+Lrσ。
Formula (5) are substituted into formula (1), can be obtained:
When being passed through direct current in machine winding, asynchronous machine remains static, slip s=1, and formula (6) can be write
At:
To the both sides integral of the equation of formula (7), can obtain:
That is,
All voltage, electric current are in the initial time (i.e. t=0) to asynchronous machine output alternating current, asynchronous machine
0；Rotor when the voltage and current of the alternating current exported to asynchronous machine reaches stable state (i.e. t → ∞), in asynchronous machine
Electric current is 0 (i.e. ir(∞)=0), stator current is electric current (the i.e. i detected when reaching stable states(∞)=Is), then have:
That is,
It is t → ∞ moment assuming that when voltage, electric current reach stable state, formula (11) discretization expression formula can be with are as follows:
In formula (12), T is default calculating cycle, such as can be identical as the output carrier cycle of frequency converter of direct current；K is
The detection moment of voltage and current, k=0 ..., N；That is k=0 is the initial time that alternating current is exported to asynchronous machine, and k=N is
The voltage and current of the alternating current exported to asynchronous machine reaches the initial time of stable state, i.e. us(N) and isIt (N) is respectively to reach
Voltage (second voltage) and electric current (the second electric current) when to stable state；IsIt such as can be i to reach electric current when stable states(N),
Can for it is multiple reach stable state when electric current average value, i.e., the average value of multiple second electric currents.
According to the stator leakage inductance (L of asynchronous machinesσ), the mutual inductance of asynchronous machine can be calculated by formula (13):
Lm=Ls-Lsσ (13)
That is, this step can be according to reaching the voltage (first voltage) before stable state and electric current (the first electric current) and reach
Voltage (second voltage) and electric current (the second electric current) when to stable state utilizeMeter
Calculation obtains stator inductance value (Ls)；Calculate stator inductance value (Ls) and stator leakage inductance difference (Lsσ), obtain mutual inductance (Lm).As long as place
Manage device can sharp first voltage, the first electric current, second voltage and the second electric current, that is, when utilizing direct current electrical pumping machine winding, by
Initial time detects into the transient process between the initial time for reaching stable state and obtains voltage and current, calculates asynchronous machine
Mutual inductance, for specific calculation, the present embodiment does not do any restrictions.
In the present embodiment, the embodiment of the present invention detects direct current by injecting direct current to static asynchronous machine
Voltage and current, the transient process generated in machine winding using direct current quickly calculate the mutual inductance of asynchronous machine, so as to
To complete the accurate recognition to mutual inductance parameter in the case where asynchronous machine remains static.
Referring to FIG. 4, Fig. 4 is a kind of knot of the mutual inductance static state device for identifying of asynchronous machine provided by the embodiment of the present invention
Structure block diagram.The apparatus may include:
Detection unit 10 is exported, for injecting direct current to static asynchronous machine, and detects the voltage and electricity of direct current
Stream；
Judging unit 20, for judging whether voltage and current reaches stable state；
Computing unit 30, if for reaching stable state, according to first voltage, the first electric current, second voltage, the second electric current and
The stator leakage inductance of asynchronous machine calculates the mutual inductance of asynchronous machine；Wherein, first voltage and the first electric current are respectively before reaching stable state
Voltage and current, second voltage and the second electric current are respectively voltage and current when reaching stable state.
Optionally, detection unit 10 is exported, may include:
Subelement is controlled, injects direct current to asynchronous machine for controlling frequency converter；Wherein, voltage and current is respectively to become
The output voltage and output electric current of frequency device.
Optionally, judging unit 20 may include:
Judgment sub-unit, for judging whether the difference in the first preset time period between current flow and next electric current is equal
In the first preset range；
Transmission sub-unit, if in the first preset range, first in the first preset time period is current
Electric current as electric current when reaching stable state, using the corresponding current voltage of first current flow in the first preset time period as
Reach voltage when stable state, and sends enabling signal to computing unit 30.
Optionally, computing unit 30 may include:
First computation subunit, for according to reaching the voltage and current before stable state and voltage and electricity when reaching stable state
Stream utilizesStator inductance value is calculated；Wherein, LsFor stator inductance value, Is
For the second electric current, k is the detection moment of voltage and current, k=0 ..., N；usIt (k) is voltage, usIt (N) is second voltage, is(k)
For electric current, T is default calculating cycle, RsFor stator resistance；
Second computation subunit obtains mutual inductance for calculating the difference of stator inductance value and stator leakage inductance.
In the present embodiment, the embodiment of the present invention injects direct current to static asynchronous machine by output detection unit 10,
And the voltage and current of direct current is detected, the transient process generated in machine winding using direct current quickly calculates asynchronous electricity
The mutual inductance of machine, so as to complete the accurate recognition to mutual inductance parameter in the case where asynchronous machine remains static.
In addition, the present invention also provides a kind of mutual inductance static state identification apparatus of asynchronous machine, comprising: memory, for depositing
Store up computer program；Processor realizes the mutual of the asynchronous machine as provided by above-described embodiment when for executing computer program
The step of feeling static discrimination method.
Each embodiment is described in a progressive manner in specification, the highlights of each of the examples are with other realities
The difference of example is applied, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment and
For equipment, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is referring to method portion
It defends oneself bright.
Professional further appreciates that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure
And algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These
Function is implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Profession
Technical staff can use different methods to achieve the described function each specific application, but this realization is not answered
Think beyond the scope of this invention.
A kind of mutual inductance static state discrimination method, device and the equipment of asynchronous machine provided by the present invention have been carried out in detail above
It is thin to introduce.Used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright to be merely used to help understand method and its core concept of the invention.It should be pointed out that for the ordinary skill of the art
, without departing from the principle of the present invention, can be with several improvements and modifications are made to the present invention for personnel, these improvement
It is also fallen within the protection scope of the claims of the present invention with modification.
Claims (10)
1. a kind of mutual inductance static state discrimination method of asynchronous machine characterized by comprising
Direct current is injected to static asynchronous machine, and detects the voltage and current of the direct current；
Judge whether the voltage and the electric current reach stable state；
If so, according to first voltage, the first electric current, second voltage, the stator leakage inductance of the second electric current and the asynchronous machine, meter
Calculate the mutual inductance of the asynchronous machine；Wherein, the first voltage and first electric current are respectively to reach the electricity before stable state
Pressure and the electric current, the second voltage and second electric current are respectively the voltage and the electric current when reaching stable state.
2. the mutual inductance static state discrimination method of asynchronous machine according to claim 1, which is characterized in that described to static different
It walks motor and injects direct current, comprising:
It controls frequency converter and exports the direct current to the asynchronous machine；Wherein, the voltage and the electric current are respectively described
The output voltage and output electric current of frequency converter.
3. the mutual inductance static state discrimination method of asynchronous machine according to claim 1, which is characterized in that the judgement electricity
Whether pressure and the electric current reach stable state, comprising:
Judge the difference in the first preset time period between current flow and next electric current whether in the first preset range；
If so, using first current flow in first preset time period as electric current when reaching stable state, it will
The corresponding current voltage of first current flow in first preset time period as voltage when reaching stable state, and
It executes described according to first voltage, the first electric current, second voltage, the stator leakage inductance of the second electric current and the asynchronous machine, calculating
The step of mutual inductance of the asynchronous machine.
4. the mutual inductance static state discrimination method of asynchronous machine according to any one of claims 1 to 3, which is characterized in that described
According to first voltage, the first electric current, second voltage, the stator leakage inductance of the second electric current and the asynchronous machine, calculate described asynchronous
The mutual inductance of motor, comprising:
According to the first voltage, first electric current, the second voltage, second electric current, utilizeStator inductance value is calculated；Wherein, LsFor the stator inductance value, IsFor institute
The second electric current is stated, k is the detection moment of the voltage and the electric current, k=0 ..., N；usIt (k) is the voltage, usIt (N) is institute
State second voltage, isIt (k) is the electric current, T is default calculating cycle, RsFor stator resistance；
The difference for calculating the stator inductance value and the stator leakage inductance, obtains the mutual inductance.
5. the mutual inductance static state discrimination method of asynchronous machine according to claim 4, which is characterized in that the default calculating week
Phase is identical as the carrier cycle of frequency converter for exporting the direct current.
6. a kind of mutual inductance static state device for identifying of asynchronous machine characterized by comprising
Detection unit is exported, for injecting direct current to static asynchronous machine, and detects the voltage and current of the direct current；
Judging unit, for judging whether the voltage and the electric current reach stable state；
Computing unit, if for reaching stable state, according to first voltage, the first electric current, second voltage, the second electric current and described different
The stator leakage inductance for walking motor, calculates the mutual inductance of the asynchronous machine；Wherein, the first voltage and first electric current are respectively
The voltage and the electric current before reaching stable state, the second voltage and second electric current are respectively institute when reaching stable state
State voltage and the electric current.
7. the mutual inductance static state device for identifying of asynchronous machine according to claim 6, which is characterized in that the output detection is single
Member, comprising:
Subelement is controlled, exports the direct current to the asynchronous machine for controlling frequency converter；Wherein, the voltage and described
Electric current is respectively the output voltage and output electric current of the frequency converter.
8. the mutual inductance static state device for identifying of asynchronous machine according to claim 6, which is characterized in that the judging unit,
Include:
Judgment sub-unit, for judging the difference in the first preset time period between current flow and next electric current whether
In one preset range；
Transmission sub-unit, if in first preset range, by first in first preset time period
Current flow is corresponding by first current flow in first preset time period as electric current when reaching stable state
Current voltage sends enabling signal as voltage when reaching stable state, and to the computing unit.
9. according to the mutual inductance static state device for identifying of the described in any item asynchronous machines of claim 6 to 8, which is characterized in that described
Computing unit, comprising:
First computation subunit, for according to electricity when reaching the voltage before stable state and the electric current and reaching stable state
Pressure and the electric current utilizeStator inductance value is calculated；Wherein, LsIt is described
Stator inductance value, IsFor second electric current, k is the detection moment of the voltage and the electric current, k=0 ..., N；us(k) it is
The voltage, usIt (N) is the second voltage, isIt (k) is the electric current, T is default calculating cycle, RsFor stator resistance；
Second computation subunit obtains the mutual inductance for calculating the difference of the stator inductance value and the stator leakage inductance.
10. a kind of mutual inductance static state identification apparatus of asynchronous machine characterized by comprising
Memory, for storing computer program；
Processor realizes the mutual of such as asynchronous machine described in any one of claim 1 to 5 when for executing the computer program
The step of feeling static discrimination method.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910809200.4A CN110474590B (en) | 2019-08-29 | 2019-08-29 | Mutual inductance static identification method, device and equipment of asynchronous motor |
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| CN201910809200.4A CN110474590B (en) | 2019-08-29 | 2019-08-29 | Mutual inductance static identification method, device and equipment of asynchronous motor |
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| CN110474590A true CN110474590A (en) | 2019-11-19 |
| CN110474590B CN110474590B (en) | 2021-03-23 |
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| CN112968645A (en) * | 2021-04-01 | 2021-06-15 | 深圳市英威腾电气股份有限公司 | Motor mutual inductance identification method, system and device |
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