CN110266233A - A kind of calculation method and device of asynchronous machine initial speed - Google Patents
A kind of calculation method and device of asynchronous machine initial speed Download PDFInfo
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- CN110266233A CN110266233A CN201910556495.9A CN201910556495A CN110266233A CN 110266233 A CN110266233 A CN 110266233A CN 201910556495 A CN201910556495 A CN 201910556495A CN 110266233 A CN110266233 A CN 110266233A
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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
- H02P21/18—Estimation of position or speed
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Abstract
The calculation method and device of asynchronous machine initial speed provided by the invention, after injecting DC current to motor, by the frequency for extracting the same frequency AC compounent in motor three-phase current, calculate motor initial speed, entire calculating process is not related to the calculating of stator voltage, and then stator voltage is influenced by Inverter Dead-time, tube voltage drop and motor stator resistance when avoiding motor stator underfrequency, the problem for causing the motor initial speed accuracy being calculated according to stator voltage too low improves the accuracy for calculating motor initial speed.
Description
Technical field
The present invention relates to technical field of wind power, more particularly to a kind of calculation method of asynchronous machine initial speed and
Device.
Background technique
Speed Sensorless Induction Motor control system is carried out using the physical quantity that stator voltage, electric current etc. are readily detected
Velocity estimation to replace velocity sensor, at low cost, probability of malfunction is small, from advantages such as maintenances to velocity sensor,
Therefore, it is widely used in wind-powered electricity generation field.In the operational process of Speed Sensorless Induction Motor vector control system, work as electricity
When the practical initial speed of machine and initial speed deviation without speed control algorithm setting are too big, starting failure will lead to, or even it can
The mechanical system service life of motor and entire blower can be influenced because of torque shock, the accurate motor initial speed that calculates is to Guan Chong
It wants.
At present generally by injecting DC current to motor, excited electrons generate rotor flux, and voltage model is recycled to estimate
Rotor magnetic linkage is calculated, motor initial speed is estimated according to rotor flux.But when motor stator underfrequency, stator voltage
Also very low, the influence of Inverter Dead-time, tube voltage drop and motor stator resistance to stator voltage is very big, and passes through inverter duty cycle
The stator voltage being calculated with voltage reconstruction does not consider Inverter Dead-time, tube voltage drop and motor stator resistance to stator voltage
It influences, to keep the error between the stator voltage being calculated and actual stator voltage larger.On this basis, voltage is utilized
Error is also very big between the rotor flux that model is estimated and actual rotor magnetic linkage, estimates so as to cause according to rotor flux
There is also very big errors between the motor initial speed arrived and real electrical machinery initial speed.
Summary of the invention
In view of this, the present invention provides the calculation method and device of a kind of asynchronous machine initial speed, by extracting electricity
The frequency of same frequency AC compounent in machine three-phase current, further calculates motor initial speed, improves motor initial speed
Accuracy.
In order to achieve the above-mentioned object of the invention, concrete technical problems provided by the invention are as follows:
A kind of calculation method of asynchronous machine initial speed, comprising:
DC current is injected to motor；
Extract the frequency of the same frequency AC compounent in motor three-phase current；
According to the relationship of current fluctuation frequency and motor speed, motor initial speed is calculated.
Optionally, the method also includes:
Judge whether motor is in long-time stop working state；
If motor is in long-time stop working state, execute described to motor injection DC current；
If motor is in short time stop working state, the same frequency exchange point extracted in motor three-phase current is executed
The frequency of amount.
It is optionally, described to judge whether motor is in long-time stop working state, comprising:
Judge the absolute value of motor three-phase current whether all no more than preset value；
If wherein any one phase current is greater than the preset value, determine that motor is in short time stop working state；
If being all not more than the preset value, determine that motor is in long-time stop working state.
Optionally, it is described judge whether motor is in long-time halted state before, the method also includes:
It controls inverter and exports the duty ratio opposite with the duty ratio that last time exports；
Zero voltage vector is exported, and sets 1 for identification step；
Start timer, timing duration is the first preset duration.
Optionally, before the injection DC current to motor, the method also includes:
2 are set by identification step.
Optionally, before the frequency of the same frequency AC compounent in the extraction motor three-phase current, the method is also wrapped
It includes:
Start timer, timing duration is the second preset duration.
Optionally, the frequency for extracting the same frequency AC compounent in motor three-phase current, comprising:
With preset sample frequency and sampling number, the same frequency AC compounent in motor three-phase current is sampled；
Fft analysis is carried out to sample rate current, the sample frequency and the sampling number, is calculated in motor three-phase current
With the coarse frequency of frequency AC compounent；
Power frequency precision is set, and according to the power frequency precision, the sample frequency and the sampling number, meter
Calculate the corresponding frequency abstraction section of the power frequency precision；
The corresponding current amplitude of each frequency in the frequency abstraction section is calculated, obtains amplitude array Amp [k], and really
Determine the array index k of maximum current amplitude0；
Array index k according to the rough and careless frequency, the power frequency precision, the maximum current amplitude0And institute
The maximum subscript of amplitude array Amp [k] is stated, the final frequency of the same frequency AC compounent in motor three-phase current is calculated.
Optionally, described that fft analysis is carried out to sample rate current, the sample frequency and the sampling number, calculate motor
The coarse frequency of same frequency AC compounent in three-phase current, comprising:
Fft analysis is carried out to sample rate current, the sample frequency and the sampling number, generates FFT amplitude array
FFTAmp [Num], wherein Num is the sampling number；
Determine the array index N of maximum current amplitude in FFTAmp [1] to FFTAmp [Num/2], and according to the subscript
N, the sample frequency and the sampling number calculate the coarse frequency of the same frequency AC compounent in motor three-phase current.
A kind of computing device of asynchronous machine initial speed, comprising:
Electric current injection unit, for injecting DC current to motor；
Frequency abstraction unit, for extracting the frequency of the same frequency AC compounent in motor three-phase current；
Speed calculation unit calculates motor initial speed for the relationship according to current fluctuation frequency and motor speed.
Optionally, described device further include:
State detection unit, for judging whether motor is in long-time stop working state, if motor is in for a long time
Stop working state triggers the electric current injection unit；If motor is in short time stop working state, triggers the frequency and mention
Take unit.
Optionally, the state detection unit, is specifically used for:
Judge the absolute value of motor three-phase current whether all no more than preset value；
If wherein any one phase current is greater than the preset value, determine that motor is in short time stop working state；
If being all not more than the preset value, determine that motor is in long-time stop working state.
Optionally, described device further include:
Duty ratio output unit exports the duty ratio opposite with the duty ratio that last time exports for controlling inverter；
Vector output unit is set as 1 for exporting Zero voltage vector, and by identification step；
First timing unit, for starting timer, timing duration is the first preset duration, shape described in timing end trigger
State detection unit；
Step setting unit is recognized, for setting 2 for identification step before injecting DC current to motor.
Optionally, described device further include:
Second timing unit, for starting timer, timing duration is the second preset duration, after timing described in triggering
Frequency abstraction unit.
Optionally, the frequency abstraction unit, comprising:
Current sample subelement is used for preset sample frequency and sampling number, to the same frequency in motor three-phase current
AC compounent is sampled；
Coarse frequency computation subunit, for carrying out FFT points to sample rate current, the sample frequency and the sampling number
Analysis calculates the coarse frequency of the same frequency AC compounent in motor three-phase current；
Resolution ratio interval computation subelement, for being arranged power frequency precision, and according to the power frequency precision, described
Sample frequency and the sampling number calculate the corresponding frequency abstraction section of the power frequency precision；
Current amplitude computation subunit, for calculating the corresponding current amplitude of each frequency in the frequency abstraction section,
Amplitude array Amp [k] is obtained, and determines the array index k of maximum current amplitude0；
Final frequency computation subunit, for according to the rough and careless frequency, the power frequency precision, the maximum current
The array index k of amplitude0And the maximum subscript of the amplitude array Amp [k], calculate the same frequency exchange in motor three-phase current
The final frequency of component.
Optionally, the coarse frequency computation subunit, specifically for sample rate current, the sample frequency and described adopting
Number of samples carries out fft analysis, generates FFT amplitude array FFTAmp [Num], wherein Num is the sampling number；It determines
FFTAmp [1] arrives the array index N of maximum current amplitude in FFTAmp [Num/2], and according to the subscript N, sampling frequency
Rate and the sampling number calculate the coarse frequency of the same frequency AC compounent in motor three-phase current.
Compared with the existing technology, beneficial effects of the present invention are as follows:
The calculation method of asynchronous machine initial speed disclosed by the invention passes through extraction after injecting DC current to motor
The frequency of same frequency AC compounent in motor three-phase current, calculates motor initial speed, and entire calculating process is not related to stator electricity
The calculating of pressure, so when avoiding motor stator underfrequency stator voltage by Inverter Dead-time, tube voltage drop and motor stator electricity
The influence of resistance, the problem for causing the motor initial speed accuracy being calculated according to stator voltage too low improve calculating electricity
The accuracy of machine initial speed.
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 diagram of the calculation method of asynchronous machine initial speed disclosed by the embodiments of the present invention；
Fig. 2 is that the asynchronous machine initial speed disclosed by the embodiments of the present invention based on dq coordinate system calculates control block diagram；
Fig. 3 is that the asynchronous machine initial speed disclosed by the embodiments of the present invention based on α β coordinate system calculates control block diagram；
Fig. 4 is a kind of flow diagram of power frequency extracting method disclosed by the embodiments of the present invention；
Fig. 5 is that 2.5Mw 2 injects the motor three-phase current waveform signal after 50A DC current to pole three phase asynchronous motor
Figure；
Fig. 6 is that the motor three-phase current after injecting 50A DC current to pole three phase asynchronous motor to 2.5Mw 2 carries out FFT
The spectrogram schematic diagram of electric current after analysis；
Fig. 7 is the flow diagram of the calculation method of another asynchronous machine initial speed disclosed by the embodiments of the present invention；
Fig. 8 is the flow diagram of the calculation method of another asynchronous machine initial speed disclosed by the embodiments of the present invention；
Fig. 9 is a kind of structural schematic diagram of the computing device of asynchronous machine initial speed disclosed by the embodiments of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The calculation method of asynchronous machine initial speed disclosed in the present embodiment is applied to asynchronous motor control device, please refers to
Fig. 1, specifically includes the following steps:
S101: DC current is injected to motor；
Referring to Fig. 2, the current value that will be injected is assigned to id*=Idc when needing to inject DC current, by park,
The angle that ipark transformation needs is set to 0, and synchronous rotary dq coordinate system is overlapped with static α β coordinate system always at this time, the electricity of injection
Stream is DC current under dq, α β, abc coordinate.
By injection DC current after can motivate motor generate rotor flux, this rotor flux AC compounent amplitude can with turn
The inverse of sub- time constant does exponential damping, and frequency is rotor electric angle frequency, and spatially showing as revolving speed is rotor electric angle
The magnetic field of frequency rotation.Since motor stator is static, this rotating excitation field meeting cutting stator winding generates the induced electricity with frequency
Kinetic potential causes to disturb with frequency to electric current loop, and the AC compounent with frequency can be contained in final motor three-phase current.It is above-mentioned by extracting
The frequency of electric current alternating component passes through calculating again can be obtained motor initial velocity.
It should be noted that due to this asynchronous machine initial speed calculation method injection be DC current, be based on α
The initial speed identification of motor equally may be implemented in the control method of β coordinate system, and the asynchronous machine based on α β coordinate system initially turns
Speed calculates control block diagram and enters shown in Fig. 3.
S102: the frequency of the same frequency AC compounent in motor three-phase current is extracted；
Specifically, referring to Fig. 4, the frequency for extracting the same frequency AC compounent in motor three-phase current specifically includes following step
It is rapid:
S401: with preset sample frequency and sampling number, the same frequency AC compounent in motor three-phase current is adopted
Sample；
Specifically, sample frequency is fs, sampling number Num, then frequency resolution is fs/Num, acquisition time Time=
Num/fs。
Since rotor flux alternating component amplitude is doing exponential damping, the current acquisition time can not be too long, otherwise adopts
The latter half of electric current alternating component meeting very little of colleeting comb, is unfavorable for fft analysis, there are contradictions with the sampling time for resolution ratio.If taking
Num=1024, system sampling frequency fs=2kHz, then acquisition time Time=Num/fs=512ms is proper.
S402: carrying out fft analysis to sample rate current, sample frequency and sampling number, calculates same in motor three-phase current
The coarse frequency of frequency AC compounent；
FFT (FastFourier Transformation) is the fast algorithm of discrete fourier transform (DFT).
Fft analysis is carried out to sample rate current, sample frequency and sampling number, is generated FFT amplitude array FFTAmp [Num],
Wherein, Num is sampling number；
Determine the array index N of maximum current amplitude in FFTAmp [1] to FFTAmp [Num/2], and according to the subscript
N, the sample frequency and the sampling number calculate the coarse frequency of the same frequency AC compounent in motor three-phase current.
Coarse frequency fI=N*fs/Num=1.953N, power frequency precision at this time only has 1.953Hz, in order to further
Power frequency extraction accuracy is improved, is carried out the following processing.
S403: setting power frequency precision, and according to power frequency precision, sample frequency and sampling number, calculating current
The corresponding frequency abstraction section of frequency accuracy；
Power frequency precision f is setmin, fminIt can be arbitrarily small, it is assumed that be set as f hereinmin=0.1Hz, at this point, frequency
The length Kmax=2*fs/Num/f of extraction intervalmin=39, frequency abstraction section is [1,39].
S404: calculating the corresponding current amplitude of each frequency in frequency abstraction section, obtains amplitude array Amp [k], and really
Determine the array index k of maximum current amplitude0；
The corresponding current amplitude of each frequency, can regard amplitude array Amp [k] as in frequency abstraction section.
The lower label for successively finding out amplitude maximum in array Amp [k] is0。
S405: the array index k according to rough and careless frequency, power frequency precision, maximum current amplitude0And amplitude array
The maximum subscript of Amp [k] calculates the final frequency of the same frequency AC compounent in motor three-phase current.
Final accurate power frequency are as follows:
fIfinal=fIfmin(k0-0.5Kmax)
Fig. 5 is that 2.5Mw 2 injects the motor three-phase current waveform after 50A DC current to pole three phase asynchronous motor, wherein
A phase current average value is 50A, and the AC compounent containing an amplitude attenuation.
Fig. 6 is the spectrogram that electric current after fft analysis is carried out to above-mentioned motor three-phase current, is provided with herein for coarse analysis
Resolution ratio 2Hz, amplitude maximum is 8Hz as seen from the figure, and actual current frequency is answered are as follows: fI=n*60/Np=250*60/2=
8.33Hz, therefore directly obtain power frequency by the result of FFT and have certain error, by the high-precision frequency abstraction being previously mentioned
Method can be by frequency abstraction precision improvement to any setting value, and the initial speed precision estimated in this way can be higher.
S103: according to the relationship of current fluctuation frequency and motor speed, motor initial speed is calculated.
Specifically, the calculation of motor initial speed is as follows:
Wherein, n0For motor initial speed, fIfinalFor the same frequency exchange in motor three-phase current obtained in above-mentioned steps
The frequency of component, NpFor motor number of pole-pairs.
As it can be seen that the calculation method of asynchronous machine initial speed disclosed in the present embodiment, after injecting DC current to motor, leads to
The frequency for extracting the same frequency AC compounent in motor three-phase current is crossed, motor initial speed is calculated, entire calculating process is not related to
The calculating of stator voltage, so when avoiding motor stator underfrequency stator voltage by Inverter Dead-time, tube voltage drop and motor
The influence of stator resistance, the problem for causing the motor initial speed accuracy being calculated according to stator voltage too low, improves
Calculate the accuracy of motor initial speed.
When motor is in short time stop working state, motor magnetic linkage is not decayed completely, there are also when remanent magnetism, utilizes remanent magnetism
Can more quickly, high precision computation motor initial speed, and not will cause big torque shock, on this basis, please refer to
Fig. 7, present embodiment discloses the calculation methods of another asynchronous machine initial speed, and S701 is first carried out: whether judging motor
In long-time stop working state；
If motor is in long-time stop working state, S702 is executed: injecting DC current to motor；
If motor is in short time stop working state, S703 is executed: extracting the same frequency exchange in motor three-phase current
The frequency of component.
Wherein, specifically, whether the absolute value by judging motor three-phase current judges motor be all no more than preset value
It is no to be in long-time stop working state.
If wherein any one phase current is greater than the preset value, determine that motor is in short time stop working state；
If being all not more than the preset value, determine that motor is in long-time stop working state.
By judging whether motor is in long-time stop working state, avoids being in the short time in motor and stop working shape
State, i.e., when magnetic linkage has not been decayed, hastily after Injection Current caused by big torque shock, influence motor and mechanical system service life
Problem ensure that the stability and safety of motor operation.
Further, it whether is in long-time run-stopping status in order to accurate judgement motor, and accurately extracts motor
The frequency of same frequency AC compounent in three-phase current, present embodiment discloses the calculating sides of another asynchronous machine initial speed
Method.
Referring to Fig. 8, executing S804: before judging whether motor is in long-time halted state, execute following operation:
S801: control inverter exports the duty ratio opposite with the duty ratio that last time exports.
Specifically, the duty ratio of this output is 0, if last time inverter if the duty ratio of last time inverter output is 1
The duty ratio of output is 0, then the duty ratio of this output is 1, is prevented since the duty ratio exported every time is identical caused
The problem of using upper bridgc arm short or lower bridge arm short circuit every time, causing the power tube lost of life.
S802: output Zero voltage vector, and 1 is set by identification step.
Identification state step Step determines that actual duty cycle comes from current loop control output or fixed value 0 or 1,
Threephase stator short-circuit condition or current loop control state are in control motor.
1 is set by identification step, three-phase duty cycle signals is enabled to be equal to 0 or equal to 1.
S803: whether starting timer, timing duration reach the first preset duration, such as 10ms.
When timing duration reaches the first preset duration, motor three-phase current is relatively stable, at this time can be accurately by sentencing
Whether the absolute value of power machine three-phase current is both greater than preset value, to determine whether motor is in long-time stop working state.
Correspondingly, S805: setting 2 for identification step, inject DC current to motor.
2 are set as by the way that step will be recognized, control motor is in current loop control state, convenient for subsequent straight to motor injection
Galvanic electricity stream.
It is executing S807: extracting the frequency of the same frequency AC compounent in motor three-phase current, execute following steps before:
S806: whether starting timer, timing duration reach the second preset duration, such as 50ms.
When timing duration reaches the second preset duration, the same frequency AC compounent in motor three-phase current is relatively stable, at this point,
The frequency of the same frequency AC compounent in motor three-phase current can accurately be extracted.
Disclosed a kind of calculation method of asynchronous machine initial speed based on the above embodiment, this implementation correspondence disclose one
The computing device of kind asynchronous machine initial speed, referring to Fig. 9, the device includes:
Electric current injection unit 901, for injecting DC current to motor；
Frequency abstraction unit 902, for extracting the frequency of the same frequency AC compounent in motor three-phase current；
Speed calculation unit 903 calculates motor and initially turns for the relationship according to current fluctuation frequency and motor speed
Speed.
Optionally, described device further include:
State detection unit, for judging whether motor is in long-time stop working state, if motor is in for a long time
Stop working state triggers the electric current injection unit；If motor is in short time stop working state, triggers the frequency and mention
Take unit.
Optionally, the state detection unit, is specifically used for:
Judge the absolute value of motor three-phase current whether all no more than preset value；
If wherein any one phase current is greater than the preset value, determine that motor is in short time stop working state；
If being all not more than the preset value, determine that motor is in long-time stop working state.
Optionally, described device further include:
Duty ratio output unit exports the duty ratio opposite with the duty ratio that last time exports for controlling inverter；
Vector output unit is set as 1 for exporting Zero voltage vector, and by identification step；
First timing unit, for starting timer, timing duration is the first preset duration, shape described in timing end trigger
State detection unit；
Step setting unit is recognized, for setting 2 for identification step before injecting DC current to motor.
Optionally, described device further include:
Second timing unit, for starting timer, timing duration is the second preset duration, after timing described in triggering
Frequency abstraction unit.
Optionally, the frequency abstraction unit 902, comprising:
Current sample subelement is used for preset sample frequency and sampling number, to the same frequency in motor three-phase current
AC compounent is sampled；
Coarse frequency computation subunit, for carrying out FFT points to sample rate current, the sample frequency and the sampling number
Analysis calculates the coarse frequency of the same frequency AC compounent in motor three-phase current；
Resolution ratio interval computation subelement, for being arranged power frequency precision, and according to the power frequency precision, described
Sample frequency and the sampling number calculate the corresponding frequency abstraction section of the power frequency precision；
Current amplitude computation subunit, for calculating the corresponding current amplitude of each frequency in the frequency abstraction section,
Amplitude array Amp [k] is obtained, and determines the array index k of maximum current amplitude0；
Final frequency computation subunit, for according to the rough and careless frequency, the power frequency precision, the maximum current
The array index k of amplitude0And the maximum subscript of the amplitude array Amp [k], calculate the same frequency exchange in motor three-phase current
The final frequency of component.
Optionally, the coarse frequency computation subunit, specifically for sample rate current, the sample frequency and described adopting
Number of samples carries out fft analysis, generates FFT amplitude array FFTAmp [Num], wherein Num is the sampling number；It determines
FFTAmp [1] arrives the array index N of maximum current amplitude in FFTAmp [Num/2], and according to the subscript N, sampling frequency
Rate and the sampling number calculate the coarse frequency of the same frequency AC compounent in motor three-phase current.
The computing device of asynchronous machine initial speed disclosed in the present embodiment, after injecting DC current to motor, by mentioning
The frequency of the same frequency AC compounent in motor three-phase current is taken, motor initial speed is calculated, entire calculating process is not related to stator
The calculating of voltage, so when avoiding motor stator underfrequency stator voltage by Inverter Dead-time, tube voltage drop and motor stator
The influence of resistance, the problem for causing the motor initial speed accuracy being calculated according to stator voltage too low, improves calculating
The accuracy of motor initial speed.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one
Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can directly be held with hardware, processor
The combination of capable software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of calculation method of asynchronous machine initial speed characterized by comprising
DC current is injected to motor；
Extract the frequency of the same frequency AC compounent in motor three-phase current；
According to the relationship of current fluctuation frequency and motor speed, motor initial speed is calculated.
2. the method according to claim 1, wherein the method also includes:
Judge whether motor is in long-time stop working state；
If motor is in long-time stop working state, execute described to motor injection DC current；
If motor is in short time stop working state, the same frequency AC compounent in the extraction motor three-phase current is executed
Frequency.
3. according to the method described in claim 2, it is characterized in that, described judge whether motor is in the shape that stops working for a long time
State, comprising:
Judge the absolute value of motor three-phase current whether all no more than preset value；
If wherein any one phase current is greater than the preset value, determine that motor is in short time stop working state；
If being all not more than the preset value, determine that motor is in long-time stop working state.
4. according to the method described in claim 2, it is characterized in that, judging whether motor is in long-time halted state described
Before, the method also includes:
It controls inverter and exports the duty ratio opposite with the duty ratio that last time exports；
Zero voltage vector is exported, and sets 1 for identification step；
Start timer, timing duration is the first preset duration.
5. according to the method described in claim 4, it is characterized in that, it is described to motor inject DC current before, the side
Method further include:
2 are set by identification step.
6. according to the method described in claim 4, it is characterized in that, the same frequency exchange in the extraction motor three-phase current divides
Before the frequency of amount, the method also includes:
Start timer, timing duration is the second preset duration.
7. the method according to claim 1, wherein the same frequency AC compounent extracted in motor three-phase current
Frequency, comprising:
With preset sample frequency and sampling number, the same frequency AC compounent in motor three-phase current is sampled；
Fft analysis is carried out to sample rate current, the sample frequency and the sampling number, calculates the same frequency in motor three-phase current
The coarse frequency of AC compounent；
Power frequency precision is set, and according to the power frequency precision, the sample frequency and the sampling number, calculates institute
State the corresponding frequency abstraction section of power frequency precision；
The corresponding current amplitude of each frequency in the frequency abstraction section is calculated, obtains amplitude array Amp [k], and determine most
The array index k of high current amplitude0；
Array index k according to the coarse frequency, the power frequency precision, the maximum current amplitude0And the amplitude
The maximum subscript of array Amp [k] calculates the final frequency of the same frequency AC compounent in motor three-phase current.
8. to sample rate current, the sample frequency and described being adopted the method according to the description of claim 7 is characterized in that described
Number of samples carries out fft analysis, calculates the coarse frequency of the same frequency AC compounent in motor three-phase current, comprising:
Fft analysis is carried out to sample rate current, the sample frequency and the sampling number, generates FFT amplitude array FFTAmp
[Num], wherein Num is the sampling number；
Determine the array index N of maximum current amplitude in FFTAmp [1] to FFTAmp [Num/2], and according to the subscript N, institute
It states sample frequency and the sampling number calculates the coarse frequency of the same frequency AC compounent in motor three-phase current.
9. a kind of computing device of asynchronous machine initial speed characterized by comprising
Electric current injection unit, for injecting DC current to motor；
Frequency abstraction unit, for extracting the frequency of the same frequency AC compounent in motor three-phase current；
Speed calculation unit calculates motor initial speed for the relationship according to current fluctuation frequency and motor speed.
10. device according to claim 9, which is characterized in that described device further include:
State detection unit stops for judging whether motor is in long-time stop working state if motor is in for a long time
Working condition triggers the electric current injection unit；If motor is in short time stop working state, the frequency abstraction list is triggered
Member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910556495.9A CN110266233B (en) | 2019-06-25 | 2019-06-25 | Method and device for calculating initial rotating speed of asynchronous motor |
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